Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty into for-next
Conflicts:
arch/arm64/kernel/early_printk.c
diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
new file mode 100644
index 0000000..246c795
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
@@ -0,0 +1,33 @@
+* NXP SC16IS7xx advanced Universal Asynchronous Receiver-Transmitter (UART)
+
+Required properties:
+- compatible: Should be one of the following:
+ - "nxp,sc16is740" for NXP SC16IS740,
+ - "nxp,sc16is741" for NXP SC16IS741,
+ - "nxp,sc16is750" for NXP SC16IS750,
+ - "nxp,sc16is752" for NXP SC16IS752,
+ - "nxp,sc16is760" for NXP SC16IS760,
+ - "nxp,sc16is762" for NXP SC16IS762.
+- reg: I2C address of the SC16IS7xx device.
+- interrupt-parent: The phandle for the interrupt controller that
+ services interrupts for this IC.
+- interrupts: Should contain the UART interrupt
+- clocks: Reference to the IC source clock.
+
+Optional properties:
+- gpio-controller: Marks the device node as a GPIO controller.
+- #gpio-cells: Should be two. The first cell is the GPIO number and
+ the second cell is used to specify the GPIO polarity:
+ 0 = active high,
+ 1 = active low.
+
+Example:
+ sc16is750: sc16is750@51 {
+ compatible = "nxp,sc16is750";
+ reg = <0x51>;
+ clocks = <&clk20m>;
+ interrupt-parent = <&gpio3>;
+ interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4384217..4946d8e 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -883,6 +883,7 @@
which are not unmapped.
earlycon= [KNL] Output early console device and options.
+
uart[8250],io,<addr>[,options]
uart[8250],mmio,<addr>[,options]
uart[8250],mmio32,<addr>[,options]
@@ -892,6 +893,14 @@
(mmio) or 32-bit (mmio32).
The options are the same as for ttyS, above.
+ pl011,<addr>
+ Start an early, polled-mode console on a pl011 serial
+ port at the specified address. The pl011 serial port
+ must already be setup and configured. Options are not
+ yet supported.
+
+ smh Use ARM semihosting calls for early console.
+
earlyprintk= [X86,SH,BLACKFIN,ARM]
earlyprintk=vga
earlyprintk=efi
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index e759af5..f5f63b7 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -112,6 +112,9 @@
config KERNEL_MODE_NEON
def_bool y
+config FIX_EARLYCON_MEM
+ def_bool y
+
source "init/Kconfig"
source "kernel/Kconfig.freezer"
diff --git a/arch/arm64/Kconfig.debug b/arch/arm64/Kconfig.debug
index d10ec33..1c1b756 100644
--- a/arch/arm64/Kconfig.debug
+++ b/arch/arm64/Kconfig.debug
@@ -20,15 +20,6 @@
If in doubt, say Y.
-config EARLY_PRINTK
- bool "Early printk support"
- default y
- help
- Say Y here if you want to have an early console using the
- earlyprintk=<name>[,<addr>][,<options>] kernel parameter. It
- is assumed that the early console device has been initialised
- by the boot loader prior to starting the Linux kernel.
-
config PID_IN_CONTEXTIDR
bool "Write the current PID to the CONTEXTIDR register"
help
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile
index 7d811d9..7a6fce5 100644
--- a/arch/arm64/kernel/Makefile
+++ b/arch/arm64/kernel/Makefile
@@ -18,7 +18,6 @@
arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o
arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o
arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
-arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o
arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o
arm64-obj-$(CONFIG_KGDB) += kgdb.o
diff --git a/arch/arm64/kernel/early_printk.c b/arch/arm64/kernel/early_printk.c
deleted file mode 100644
index 2dc36d0..0000000
--- a/arch/arm64/kernel/early_printk.c
+++ /dev/null
@@ -1,156 +0,0 @@
-/*
- * Earlyprintk support.
- *
- * Copyright (C) 2012 ARM Ltd.
- * Author: Catalin Marinas <catalin.marinas@arm.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <linux/kernel.h>
-#include <linux/console.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/io.h>
-
-#include <linux/amba/serial.h>
-#include <linux/serial_reg.h>
-
-#include <asm/fixmap.h>
-
-static void __iomem *early_base;
-static void (*printch)(char ch);
-
-/*
- * PL011 single character TX.
- */
-static void pl011_printch(char ch)
-{
- while (readl_relaxed(early_base + UART01x_FR) & UART01x_FR_TXFF)
- ;
- writeb_relaxed(ch, early_base + UART01x_DR);
- while (readl_relaxed(early_base + UART01x_FR) & UART01x_FR_BUSY)
- ;
-}
-
-/*
- * Semihosting-based debug console
- */
-static void smh_printch(char ch)
-{
- asm volatile("mov x1, %0\n"
- "mov x0, #3\n"
- "hlt 0xf000\n"
- : : "r" (&ch) : "x0", "x1", "memory");
-}
-
-/*
- * 8250/16550 (8-bit aligned registers) single character TX.
- */
-static void uart8250_8bit_printch(char ch)
-{
- while (!(readb_relaxed(early_base + UART_LSR) & UART_LSR_THRE))
- ;
- writeb_relaxed(ch, early_base + UART_TX);
-}
-
-/*
- * 8250/16550 (32-bit aligned registers) single character TX.
- */
-static void uart8250_32bit_printch(char ch)
-{
- while (!(readl_relaxed(early_base + (UART_LSR << 2)) & UART_LSR_THRE))
- ;
- writel_relaxed(ch, early_base + (UART_TX << 2));
-}
-
-struct earlycon_match {
- const char *name;
- void (*printch)(char ch);
-};
-
-static const struct earlycon_match earlycon_match[] __initconst = {
- { .name = "pl011", .printch = pl011_printch, },
- { .name = "smh", .printch = smh_printch, },
- { .name = "uart8250-8bit", .printch = uart8250_8bit_printch, },
- { .name = "uart8250-32bit", .printch = uart8250_32bit_printch, },
- {}
-};
-
-static void early_write(struct console *con, const char *s, unsigned n)
-{
- while (n-- > 0) {
- if (*s == '\n')
- printch('\r');
- printch(*s);
- s++;
- }
-}
-
-static struct console early_console_dev = {
- .name = "earlycon",
- .write = early_write,
- .flags = CON_PRINTBUFFER | CON_BOOT,
- .index = -1,
-};
-
-/*
- * Parse earlyprintk=... parameter in the format:
- *
- * <name>[,<addr>][,<options>]
- *
- * and register the early console. It is assumed that the UART has been
- * initialised by the bootloader already.
- */
-static int __init setup_early_printk(char *buf)
-{
- const struct earlycon_match *match = earlycon_match;
- phys_addr_t paddr = 0;
-
- if (!buf) {
- pr_warning("No earlyprintk arguments passed.\n");
- return 0;
- }
-
- while (match->name) {
- size_t len = strlen(match->name);
- if (!strncmp(buf, match->name, len)) {
- buf += len;
- break;
- }
- match++;
- }
- if (!match->name) {
- pr_warning("Unknown earlyprintk arguments: %s\n", buf);
- return 0;
- }
-
- /* I/O address */
- if (!strncmp(buf, ",0x", 3)) {
- char *e;
- paddr = simple_strtoul(buf + 1, &e, 16);
- buf = e;
- }
- /* no options parsing yet */
-
- if (paddr)
- early_base = (void __iomem *)set_fixmap_offset_io(FIX_EARLYCON_MEM_BASE, paddr);
-
- printch = match->printch;
- early_console = &early_console_dev;
- register_console(&early_console_dev);
-
- return 0;
-}
-
-early_param("earlyprintk", setup_early_printk);
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 25d2c6f..0fb6cfd 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -261,6 +261,9 @@
config ARCH_SUPPORTS_UPROBES
def_bool y
+config FIX_EARLYCON_MEM
+ def_bool y
+
source "init/Kconfig"
source "kernel/Kconfig.freezer"
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index f1fbf4f..e00f8f5 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -118,10 +118,6 @@
int hci_uart_tx_wakeup(struct hci_uart *hu)
{
- struct tty_struct *tty = hu->tty;
- struct hci_dev *hdev = hu->hdev;
- struct sk_buff *skb;
-
if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
return 0;
@@ -129,6 +125,22 @@
BT_DBG("");
+ schedule_work(&hu->write_work);
+
+ return 0;
+}
+
+static void hci_uart_write_work(struct work_struct *work)
+{
+ struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
+ struct tty_struct *tty = hu->tty;
+ struct hci_dev *hdev = hu->hdev;
+ struct sk_buff *skb;
+
+ /* REVISIT: should we cope with bad skbs or ->write() returning
+ * and error value ?
+ */
+
restart:
clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
@@ -153,7 +165,6 @@
goto restart;
clear_bit(HCI_UART_SENDING, &hu->tx_state);
- return 0;
}
static void hci_uart_init_work(struct work_struct *work)
@@ -282,6 +293,7 @@
tty->receive_room = 65536;
INIT_WORK(&hu->init_ready, hci_uart_init_work);
+ INIT_WORK(&hu->write_work, hci_uart_write_work);
spin_lock_init(&hu->rx_lock);
@@ -319,6 +331,8 @@
if (hdev)
hci_uart_close(hdev);
+ cancel_work_sync(&hu->write_work);
+
if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
if (hdev) {
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index fffa61f..12df101 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -68,6 +68,7 @@
unsigned long hdev_flags;
struct work_struct init_ready;
+ struct work_struct write_work;
struct hci_uart_proto *proto;
void *priv;
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
index 2d4bd39..053c200 100644
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1926,13 +1926,8 @@
wait_for_xmitr(up, BOTH_EMPTY);
/*
* Send the character out.
- * If a LF, also do CR...
*/
serial_port_out(port, UART_TX, c);
- if (c == 10) {
- wait_for_xmitr(up, BOTH_EMPTY);
- serial_port_out(port, UART_TX, 13);
- }
/*
* Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index ed31135..51b307a 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -62,6 +62,70 @@
struct uart_8250_dma dma;
};
+struct dw8250_acpi_desc {
+ void (*set_termios)(struct uart_port *p, struct ktermios *termios,
+ struct ktermios *old);
+};
+
+#define BYT_PRV_CLK 0x800
+#define BYT_PRV_CLK_EN (1 << 0)
+#define BYT_PRV_CLK_M_VAL_SHIFT 1
+#define BYT_PRV_CLK_N_VAL_SHIFT 16
+#define BYT_PRV_CLK_UPDATE (1 << 31)
+
+static void byt_set_termios(struct uart_port *p, struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned int baud = tty_termios_baud_rate(termios);
+ unsigned int m, n;
+ u32 reg;
+
+ /*
+ * For baud rates 0.5M, 1M, 1.5M, 2M, 2.5M, 3M, 3.5M and 4M the
+ * dividers must be adjusted.
+ *
+ * uartclk = (m / n) * 100 MHz, where m <= n
+ */
+ switch (baud) {
+ case 500000:
+ case 1000000:
+ case 2000000:
+ case 4000000:
+ m = 64;
+ n = 100;
+ p->uartclk = 64000000;
+ break;
+ case 3500000:
+ m = 56;
+ n = 100;
+ p->uartclk = 56000000;
+ break;
+ case 1500000:
+ case 3000000:
+ m = 48;
+ n = 100;
+ p->uartclk = 48000000;
+ break;
+ case 2500000:
+ m = 40;
+ n = 100;
+ p->uartclk = 40000000;
+ break;
+ default:
+ m = 2304;
+ n = 3125;
+ p->uartclk = 73728000;
+ }
+
+ /* Reset the clock */
+ reg = (m << BYT_PRV_CLK_M_VAL_SHIFT) | (n << BYT_PRV_CLK_N_VAL_SHIFT);
+ writel(reg, p->membase + BYT_PRV_CLK);
+ reg |= BYT_PRV_CLK_EN | BYT_PRV_CLK_UPDATE;
+ writel(reg, p->membase + BYT_PRV_CLK);
+
+ serial8250_do_set_termios(p, termios, old);
+}
+
static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value)
{
struct dw8250_data *d = p->private_data;
@@ -278,6 +342,7 @@
{
const struct acpi_device_id *id;
struct uart_port *p = &up->port;
+ struct dw8250_acpi_desc *acpi_desc;
dw8250_setup_port(up);
@@ -290,14 +355,18 @@
p->serial_out = dw8250_serial_out32;
p->regshift = 2;
- if (!p->uartclk)
- p->uartclk = (unsigned int)id->driver_data;
-
up->dma = &data->dma;
up->dma->rxconf.src_maxburst = p->fifosize / 4;
up->dma->txconf.dst_maxburst = p->fifosize / 4;
+ acpi_desc = (struct dw8250_acpi_desc *)id->driver_data;
+ if (!acpi_desc)
+ return 0;
+
+ if (acpi_desc->set_termios)
+ p->set_termios = acpi_desc->set_termios;
+
return 0;
}
@@ -445,12 +514,16 @@
};
MODULE_DEVICE_TABLE(of, dw8250_of_match);
+static struct dw8250_acpi_desc byt_8250_desc = {
+ .set_termios = byt_set_termios,
+};
+
static const struct acpi_device_id dw8250_acpi_match[] = {
{ "INT33C4", 0 },
{ "INT33C5", 0 },
{ "INT3434", 0 },
{ "INT3435", 0 },
- { "80860F0A", 0 },
+ { "80860F0A", (kernel_ulong_t)&byt_8250_desc},
{ },
};
MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match);
diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index c100d63..cfef801 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -35,18 +35,8 @@
#include <linux/serial_8250.h>
#include <asm/io.h>
#include <asm/serial.h>
-#ifdef CONFIG_FIX_EARLYCON_MEM
-#include <asm/pgtable.h>
-#include <asm/fixmap.h>
-#endif
-struct early_serial8250_device {
- struct uart_port port;
- char options[16]; /* e.g., 115200n8 */
- unsigned int baud;
-};
-
-static struct early_serial8250_device early_device;
+static struct earlycon_device *early_device;
unsigned int __weak __init serial8250_early_in(struct uart_port *port, int offset)
{
@@ -100,7 +90,7 @@
static void __init early_serial8250_write(struct console *console,
const char *s, unsigned int count)
{
- struct uart_port *port = &early_device.port;
+ struct uart_port *port = &early_device->port;
unsigned int ier;
/* Save the IER and disable interrupts */
@@ -129,7 +119,7 @@
return (port->uartclk / 16) / quot;
}
-static void __init init_port(struct early_serial8250_device *device)
+static void __init init_port(struct earlycon_device *device)
{
struct uart_port *port = &device->port;
unsigned int divisor;
@@ -148,128 +138,42 @@
serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB);
}
-static int __init parse_options(struct early_serial8250_device *device,
- char *options)
+static int __init early_serial8250_setup(struct earlycon_device *device,
+ const char *options)
{
- struct uart_port *port = &device->port;
- int mmio, mmio32, length;
-
- if (!options)
- return -ENODEV;
-
- port->uartclk = BASE_BAUD * 16;
-
- mmio = !strncmp(options, "mmio,", 5);
- mmio32 = !strncmp(options, "mmio32,", 7);
- if (mmio || mmio32) {
- port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
- port->mapbase = simple_strtoul(options + (mmio ? 5 : 7),
- &options, 0);
- if (mmio32)
- port->regshift = 2;
-#ifdef CONFIG_FIX_EARLYCON_MEM
- set_fixmap_nocache(FIX_EARLYCON_MEM_BASE,
- port->mapbase & PAGE_MASK);
- port->membase =
- (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
- port->membase += port->mapbase & ~PAGE_MASK;
-#else
- port->membase = ioremap_nocache(port->mapbase, 64);
- if (!port->membase) {
- printk(KERN_ERR "%s: Couldn't ioremap 0x%llx\n",
- __func__,
- (unsigned long long) port->mapbase);
- return -ENOMEM;
- }
-#endif
- } else if (!strncmp(options, "io,", 3)) {
- port->iotype = UPIO_PORT;
- port->iobase = simple_strtoul(options + 3, &options, 0);
- mmio = 0;
- } else
- return -EINVAL;
-
- options = strchr(options, ',');
- if (options) {
- options++;
- device->baud = simple_strtoul(options, NULL, 0);
- length = min(strcspn(options, " ") + 1,
- (size_t)(sizeof(device->options)));
- strlcpy(device->options, options, length);
- } else {
- device->baud = probe_baud(port);
- snprintf(device->options, sizeof(device->options), "%u",
- device->baud);
- }
-
- if (mmio || mmio32)
- printk(KERN_INFO
- "Early serial console at MMIO%s 0x%llx (options '%s')\n",
- mmio32 ? "32" : "",
- (unsigned long long)port->mapbase,
- device->options);
- else
- printk(KERN_INFO
- "Early serial console at I/O port 0x%lx (options '%s')\n",
- port->iobase,
- device->options);
-
- return 0;
-}
-
-static struct console early_serial8250_console __initdata = {
- .name = "uart",
- .write = early_serial8250_write,
- .flags = CON_PRINTBUFFER | CON_BOOT,
- .index = -1,
-};
-
-static int __init early_serial8250_setup(char *options)
-{
- struct early_serial8250_device *device = &early_device;
- int err;
-
- if (device->port.membase || device->port.iobase)
+ if (!(device->port.membase || device->port.iobase))
return 0;
- err = parse_options(device, options);
- if (err < 0)
- return err;
+ if (!device->baud)
+ device->baud = probe_baud(&device->port);
init_port(device);
+
+ early_device = device;
+ device->con->write = early_serial8250_write;
return 0;
}
+EARLYCON_DECLARE(uart8250, early_serial8250_setup);
+EARLYCON_DECLARE(uart, early_serial8250_setup);
int __init setup_early_serial8250_console(char *cmdline)
{
- char *options;
- int err;
+ char match[] = "uart8250";
- options = strstr(cmdline, "uart8250,");
- if (!options) {
- options = strstr(cmdline, "uart,");
- if (!options)
- return 0;
- }
+ if (cmdline && cmdline[4] == ',')
+ match[4] = '\0';
- options = strchr(cmdline, ',') + 1;
- err = early_serial8250_setup(options);
- if (err < 0)
- return err;
-
- register_console(&early_serial8250_console);
-
- return 0;
+ return setup_earlycon(cmdline, match, early_serial8250_setup);
}
int serial8250_find_port_for_earlycon(void)
{
- struct early_serial8250_device *device = &early_device;
- struct uart_port *port = &device->port;
+ struct earlycon_device *device = early_device;
+ struct uart_port *port = device ? &device->port : NULL;
int line;
int ret;
- if (!device->port.membase && !device->port.iobase)
+ if (!port || (!port->membase && !port->iobase))
return -ENODEV;
line = serial8250_find_port(port);
@@ -284,5 +188,3 @@
return ret;
}
-
-early_param("earlycon", setup_early_serial8250_console);
diff --git a/drivers/tty/serial/8250/Kconfig b/drivers/tty/serial/8250/Kconfig
index 2332991..349ee59 100644
--- a/drivers/tty/serial/8250/Kconfig
+++ b/drivers/tty/serial/8250/Kconfig
@@ -61,6 +61,7 @@
bool "Console on 8250/16550 and compatible serial port"
depends on SERIAL_8250=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
---help---
If you say Y here, it will be possible to use a serial port as the
system console (the system console is the device which receives all
@@ -90,11 +91,6 @@
If unsure, say N.
-config FIX_EARLYCON_MEM
- bool
- depends on X86
- default y
-
config SERIAL_8250_GSC
tristate
depends on SERIAL_8250 && GSC
diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 5d9b01a..64c5659 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -7,6 +7,13 @@
menu "Serial drivers"
depends on HAS_IOMEM
+config SERIAL_EARLYCON
+ bool
+ help
+ Support for early consoles with the earlycon parameter. This enables
+ the console before standard serial driver is probed. The console is
+ enabled when early_param is processed.
+
source "drivers/tty/serial/8250/Kconfig"
comment "Non-8250 serial port support"
@@ -53,6 +60,7 @@
bool "Support for console on AMBA serial port"
depends on SERIAL_AMBA_PL011=y
select SERIAL_CORE_CONSOLE
+ select SERIAL_EARLYCON
---help---
Say Y here if you wish to use an AMBA PrimeCell UART as the system
console (the system console is the device which receives all kernel
@@ -65,6 +73,16 @@
your boot loader (lilo or loadlin) about how to pass options to the
kernel at boot time.)
+config SERIAL_EARLYCON_ARM_SEMIHOST
+ bool "Early console using ARM semihosting"
+ depends on ARM64 || ARM
+ select SERIAL_EARLYCON
+ help
+ Support for early debug console using ARM semihosting. This enables
+ the console before standard serial driver is probed. This is enabled
+ with "earlycon=smh" on the kernel command line. The console is
+ enabled when early_param is processed.
+
config SERIAL_SB1250_DUART
tristate "BCM1xxx on-chip DUART serial support"
depends on SIBYTE_SB1xxx_SOC=y
@@ -1160,6 +1178,16 @@
help
Support for console on SCCNXP serial ports.
+config SERIAL_SC16IS7XX
+ tristate "SC16IS7xx serial support"
+ depends on I2C
+ select SERIAL_CORE
+ select REGMAP_I2C if I2C
+ help
+ This selects support for SC16IS7xx serial ports.
+ Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
+ SC16IS760 and SC16IS762.
+
config SERIAL_BFIN_SPORT
tristate "Blackfin SPORT emulate UART"
depends on BLACKFIN
@@ -1369,18 +1397,19 @@
Enable a MXS AUART port to be the system console.
config SERIAL_XILINX_PS_UART
- tristate "Xilinx PS UART support"
+ tristate "Cadence (Xilinx Zynq) UART support"
depends on OF
select SERIAL_CORE
help
- This driver supports the Xilinx PS UART port.
+ This driver supports the Cadence UART. It is found e.g. in Xilinx
+ Zynq.
config SERIAL_XILINX_PS_UART_CONSOLE
- bool "Xilinx PS UART console support"
+ bool "Cadence UART console support"
depends on SERIAL_XILINX_PS_UART=y
select SERIAL_CORE_CONSOLE
help
- Enable a Xilinx PS UART port to be the system console.
+ Enable a Cadence UART port to be the system console.
config SERIAL_AR933X
tristate "AR933X serial port support"
@@ -1508,6 +1537,16 @@
depends on SERIAL_ST_ASC=y
select SERIAL_CORE_CONSOLE
+config SERIAL_MEN_Z135
+ tristate "MEN 16z135 Support"
+ depends on MCB
+ help
+ Say yes here to enable support for the MEN 16z135 High Speed UART IP-Core
+ on a MCB carrier.
+
+ This driver can also be build as a module. If so, the module will be called
+ men_z135_uart.ko
+
endmenu
endif # TTY
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 3680854..712732b 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -5,6 +5,9 @@
obj-$(CONFIG_SERIAL_CORE) += serial_core.o
obj-$(CONFIG_SERIAL_21285) += 21285.o
+obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
+obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
+
# These Sparc drivers have to appear before others such as 8250
# which share ttySx minor node space. Otherwise console device
# names change and other unplesantries.
@@ -48,6 +51,7 @@
obj-$(CONFIG_SERIAL_SB1250_DUART) += sb1250-duart.o
obj-$(CONFIG_ETRAX_SERIAL) += crisv10.o
obj-$(CONFIG_SERIAL_SCCNXP) += sccnxp.o
+obj-$(CONFIG_SERIAL_SC16IS7XX) += sc16is7xx.o
obj-$(CONFIG_SERIAL_JSM) += jsm/
obj-$(CONFIG_SERIAL_TXX9) += serial_txx9.o
obj-$(CONFIG_SERIAL_VR41XX) += vr41xx_siu.o
@@ -87,3 +91,4 @@
obj-$(CONFIG_SERIAL_ARC) += arc_uart.o
obj-$(CONFIG_SERIAL_RP2) += rp2.o
obj-$(CONFIG_SERIAL_FSL_LPUART) += fsl_lpuart.o
+obj-$(CONFIG_SERIAL_MEN_Z135) += men_z135_uart.o
diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c
index dacf0a0..ee3d803 100644
--- a/drivers/tty/serial/amba-pl011.c
+++ b/drivers/tty/serial/amba-pl011.c
@@ -303,7 +303,7 @@
/* Optionally make use of an RX channel as well */
chan = dma_request_slave_channel(dev, "rx");
-
+
if (!chan && plat->dma_rx_param) {
chan = dma_request_channel(mask, plat->dma_filter, plat->dma_rx_param);
@@ -2045,6 +2045,34 @@
};
#define AMBA_CONSOLE (&amba_console)
+
+static void pl011_putc(struct uart_port *port, int c)
+{
+ while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF)
+ ;
+ writeb(c, port->membase + UART01x_DR);
+ while (readl(port->membase + UART01x_FR) & UART01x_FR_BUSY)
+ ;
+}
+
+static void pl011_early_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+
+ uart_console_write(&dev->port, s, n, pl011_putc);
+}
+
+static int __init pl011_early_console_setup(struct earlycon_device *device,
+ const char *opt)
+{
+ if (!device->port.membase)
+ return -ENODEV;
+
+ device->con->write = pl011_early_write;
+ return 0;
+}
+EARLYCON_DECLARE(pl011, pl011_early_console_setup);
+
#else
#define AMBA_CONSOLE NULL
#endif
diff --git a/drivers/tty/serial/earlycon-arm-semihost.c b/drivers/tty/serial/earlycon-arm-semihost.c
new file mode 100644
index 0000000..383db10
--- /dev/null
+++ b/drivers/tty/serial/earlycon-arm-semihost.c
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Adapted for ARM and earlycon:
+ * Copyright (C) 2014 Linaro Ltd.
+ * Author: Rob Herring <robh@kernel.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+
+#ifdef CONFIG_THUMB2_KERNEL
+#define SEMIHOST_SWI "0xab"
+#else
+#define SEMIHOST_SWI "0x123456"
+#endif
+
+/*
+ * Semihosting-based debug console
+ */
+static void smh_putc(struct uart_port *port, int c)
+{
+#ifdef CONFIG_ARM64
+ asm volatile("mov x1, %0\n"
+ "mov x0, #3\n"
+ "hlt 0xf000\n"
+ : : "r" (&c) : "x0", "x1", "memory");
+#else
+ asm volatile("mov r1, %0\n"
+ "mov r0, #3\n"
+ "svc " SEMIHOST_SWI "\n"
+ : : "r" (&c) : "r0", "r1", "memory");
+#endif
+}
+
+static void smh_write(struct console *con, const char *s, unsigned n)
+{
+ struct earlycon_device *dev = con->data;
+ uart_console_write(&dev->port, s, n, smh_putc);
+}
+
+int __init early_smh_setup(struct earlycon_device *device, const char *opt)
+{
+ device->con->write = smh_write;
+ return 0;
+}
+EARLYCON_DECLARE(smh, early_smh_setup);
diff --git a/drivers/tty/serial/earlycon.c b/drivers/tty/serial/earlycon.c
new file mode 100644
index 0000000..c92e830
--- /dev/null
+++ b/drivers/tty/serial/earlycon.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2014 Linaro Ltd.
+ * Author: Rob Herring <robh@kernel.org>
+ *
+ * Based on 8250 earlycon:
+ * (c) Copyright 2004 Hewlett-Packard Development Company, L.P.
+ * Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/console.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/serial_core.h>
+
+#ifdef CONFIG_FIX_EARLYCON_MEM
+#include <asm/fixmap.h>
+#endif
+
+#include <asm/serial.h>
+
+static struct console early_con = {
+ .name = "earlycon",
+ .flags = CON_PRINTBUFFER | CON_BOOT,
+ .index = -1,
+};
+
+static struct earlycon_device early_console_dev = {
+ .con = &early_con,
+};
+
+static void __iomem * __init earlycon_map(unsigned long paddr, size_t size)
+{
+ void __iomem *base;
+#ifdef CONFIG_FIX_EARLYCON_MEM
+ set_fixmap_io(FIX_EARLYCON_MEM_BASE, paddr & PAGE_MASK);
+ base = (void __iomem *)__fix_to_virt(FIX_EARLYCON_MEM_BASE);
+ base += paddr & ~PAGE_MASK;
+#else
+ base = ioremap(paddr, size);
+#endif
+ if (!base)
+ pr_err("%s: Couldn't map 0x%llx\n", __func__,
+ (unsigned long long)paddr);
+
+ return base;
+}
+
+static int __init parse_options(struct earlycon_device *device,
+ char *options)
+{
+ struct uart_port *port = &device->port;
+ int mmio, mmio32, length;
+ unsigned long addr;
+
+ if (!options)
+ return -ENODEV;
+
+ mmio = !strncmp(options, "mmio,", 5);
+ mmio32 = !strncmp(options, "mmio32,", 7);
+ if (mmio || mmio32) {
+ port->iotype = (mmio ? UPIO_MEM : UPIO_MEM32);
+ options += mmio ? 5 : 7;
+ addr = simple_strtoul(options, NULL, 0);
+ port->mapbase = addr;
+ if (mmio32)
+ port->regshift = 2;
+ } else if (!strncmp(options, "io,", 3)) {
+ port->iotype = UPIO_PORT;
+ options += 3;
+ addr = simple_strtoul(options, NULL, 0);
+ port->iobase = addr;
+ mmio = 0;
+ } else if (!strncmp(options, "0x", 2)) {
+ port->iotype = UPIO_MEM;
+ addr = simple_strtoul(options, NULL, 0);
+ port->mapbase = addr;
+ } else {
+ return -EINVAL;
+ }
+
+ port->uartclk = BASE_BAUD * 16;
+
+ options = strchr(options, ',');
+ if (options) {
+ options++;
+ device->baud = simple_strtoul(options, NULL, 0);
+ length = min(strcspn(options, " ") + 1,
+ (size_t)(sizeof(device->options)));
+ strlcpy(device->options, options, length);
+ }
+
+ if (mmio || mmio32)
+ pr_info("Early serial console at MMIO%s 0x%llx (options '%s')\n",
+ mmio32 ? "32" : "",
+ (unsigned long long)port->mapbase,
+ device->options);
+ else
+ pr_info("Early serial console at I/O port 0x%lx (options '%s')\n",
+ port->iobase,
+ device->options);
+
+ return 0;
+}
+
+int __init setup_earlycon(char *buf, const char *match,
+ int (*setup)(struct earlycon_device *, const char *))
+{
+ int err;
+ size_t len;
+ struct uart_port *port = &early_console_dev.port;
+
+ if (!buf || !match || !setup)
+ return 0;
+
+ len = strlen(match);
+ if (strncmp(buf, match, len))
+ return 0;
+ if (buf[len] && (buf[len] != ','))
+ return 0;
+
+ buf += len + 1;
+
+ err = parse_options(&early_console_dev, buf);
+ /* On parsing error, pass the options buf to the setup function */
+ if (!err)
+ buf = NULL;
+
+ if (port->mapbase)
+ port->membase = earlycon_map(port->mapbase, 64);
+
+ early_console_dev.con->data = &early_console_dev;
+ err = setup(&early_console_dev, buf);
+ if (err < 0)
+ return err;
+ if (!early_console_dev.con->write)
+ return -ENODEV;
+
+ register_console(early_console_dev.con);
+ return 0;
+}
diff --git a/drivers/tty/serial/men_z135_uart.c b/drivers/tty/serial/men_z135_uart.c
new file mode 100644
index 0000000..d08eb5d
--- /dev/null
+++ b/drivers/tty/serial/men_z135_uart.c
@@ -0,0 +1,866 @@
+/*
+ * MEN 16z135 High Speed UART
+ *
+ * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de)
+ * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ":" fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/serial_core.h>
+#include <linux/ioport.h>
+#include <linux/io.h>
+#include <linux/tty_flip.h>
+#include <linux/bitops.h>
+#include <linux/mcb.h>
+
+#define MEN_Z135_MAX_PORTS 12
+#define MEN_Z135_BASECLK 29491200
+#define MEN_Z135_FIFO_SIZE 1024
+#define MEN_Z135_NUM_MSI_VECTORS 2
+#define MEN_Z135_FIFO_WATERMARK 1020
+
+#define MEN_Z135_STAT_REG 0x0
+#define MEN_Z135_RX_RAM 0x4
+#define MEN_Z135_TX_RAM 0x400
+#define MEN_Z135_RX_CTRL 0x800
+#define MEN_Z135_TX_CTRL 0x804
+#define MEN_Z135_CONF_REG 0x808
+#define MEN_Z135_UART_FREQ 0x80c
+#define MEN_Z135_BAUD_REG 0x810
+#define MENZ135_TIMEOUT 0x814
+
+#define MEN_Z135_MEM_SIZE 0x818
+
+#define IS_IRQ(x) ((x) & 1)
+#define IRQ_ID(x) (((x) >> 1) & 7)
+
+#define MEN_Z135_IER_RXCIEN BIT(0) /* TX Space IRQ */
+#define MEN_Z135_IER_TXCIEN BIT(1) /* RX Space IRQ */
+#define MEN_Z135_IER_RLSIEN BIT(2) /* Receiver Line Status IRQ */
+#define MEN_Z135_IER_MSIEN BIT(3) /* Modem Status IRQ */
+#define MEN_Z135_ALL_IRQS (MEN_Z135_IER_RXCIEN \
+ | MEN_Z135_IER_RLSIEN \
+ | MEN_Z135_IER_MSIEN \
+ | MEN_Z135_IER_TXCIEN)
+
+#define MEN_Z135_MCR_DTR BIT(24)
+#define MEN_Z135_MCR_RTS BIT(25)
+#define MEN_Z135_MCR_OUT1 BIT(26)
+#define MEN_Z135_MCR_OUT2 BIT(27)
+#define MEN_Z135_MCR_LOOP BIT(28)
+#define MEN_Z135_MCR_RCFC BIT(29)
+
+#define MEN_Z135_MSR_DCTS BIT(0)
+#define MEN_Z135_MSR_DDSR BIT(1)
+#define MEN_Z135_MSR_DRI BIT(2)
+#define MEN_Z135_MSR_DDCD BIT(3)
+#define MEN_Z135_MSR_CTS BIT(4)
+#define MEN_Z135_MSR_DSR BIT(5)
+#define MEN_Z135_MSR_RI BIT(6)
+#define MEN_Z135_MSR_DCD BIT(7)
+
+#define MEN_Z135_LCR_SHIFT 8 /* LCR shift mask */
+
+#define MEN_Z135_WL5 0 /* CS5 */
+#define MEN_Z135_WL6 1 /* CS6 */
+#define MEN_Z135_WL7 2 /* CS7 */
+#define MEN_Z135_WL8 3 /* CS8 */
+
+#define MEN_Z135_STB_SHIFT 2 /* Stopbits */
+#define MEN_Z135_NSTB1 0
+#define MEN_Z135_NSTB2 1
+
+#define MEN_Z135_PEN_SHIFT 3 /* Parity enable */
+#define MEN_Z135_PAR_DIS 0
+#define MEN_Z135_PAR_ENA 1
+
+#define MEN_Z135_PTY_SHIFT 4 /* Parity type */
+#define MEN_Z135_PTY_ODD 0
+#define MEN_Z135_PTY_EVN 1
+
+#define MEN_Z135_LSR_DR BIT(0)
+#define MEN_Z135_LSR_OE BIT(1)
+#define MEN_Z135_LSR_PE BIT(2)
+#define MEN_Z135_LSR_FE BIT(3)
+#define MEN_Z135_LSR_BI BIT(4)
+#define MEN_Z135_LSR_THEP BIT(5)
+#define MEN_Z135_LSR_TEXP BIT(6)
+#define MEN_Z135_LSR_RXFIFOERR BIT(7)
+
+#define MEN_Z135_IRQ_ID_MST 0
+#define MEN_Z135_IRQ_ID_TSA 1
+#define MEN_Z135_IRQ_ID_RDA 2
+#define MEN_Z135_IRQ_ID_RLS 3
+#define MEN_Z135_IRQ_ID_CTI 6
+
+#define LCR(x) (((x) >> MEN_Z135_LCR_SHIFT) & 0xff)
+
+#define BYTES_TO_ALIGN(x) ((x) & 0x3)
+
+static int line;
+
+static int txlvl = 5;
+module_param(txlvl, int, S_IRUGO);
+MODULE_PARM_DESC(txlvl, "TX IRQ trigger level 0-7, default 5 (128 byte)");
+
+static int rxlvl = 6;
+module_param(rxlvl, int, S_IRUGO);
+MODULE_PARM_DESC(rxlvl, "RX IRQ trigger level 0-7, default 6 (256 byte)");
+
+static int align;
+module_param(align, int, S_IRUGO);
+MODULE_PARM_DESC(align, "Keep hardware FIFO write pointer aligned, default 0");
+
+struct men_z135_port {
+ struct uart_port port;
+ struct mcb_device *mdev;
+ unsigned char *rxbuf;
+ u32 stat_reg;
+ spinlock_t lock;
+};
+#define to_men_z135(port) container_of((port), struct men_z135_port, port)
+
+/**
+ * men_z135_reg_set() - Set value in register
+ * @uart: The UART port
+ * @addr: Register address
+ * @val: value to set
+ */
+static inline void men_z135_reg_set(struct men_z135_port *uart,
+ u32 addr, u32 val)
+{
+ struct uart_port *port = &uart->port;
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&uart->lock, flags);
+
+ reg = ioread32(port->membase + addr);
+ reg |= val;
+ iowrite32(reg, port->membase + addr);
+
+ spin_unlock_irqrestore(&uart->lock, flags);
+}
+
+/**
+ * men_z135_reg_clr() - Unset value in register
+ * @uart: The UART port
+ * @addr: Register address
+ * @val: value to clear
+ */
+static inline void men_z135_reg_clr(struct men_z135_port *uart,
+ u32 addr, u32 val)
+{
+ struct uart_port *port = &uart->port;
+ unsigned long flags;
+ u32 reg;
+
+ spin_lock_irqsave(&uart->lock, flags);
+
+ reg = ioread32(port->membase + addr);
+ reg &= ~val;
+ iowrite32(reg, port->membase + addr);
+
+ spin_unlock_irqrestore(&uart->lock, flags);
+}
+
+/**
+ * men_z135_handle_modem_status() - Handle change of modem status
+ * @port: The UART port
+ *
+ * Handle change of modem status register. This is done by reading the "delta"
+ * versions of DCD (Data Carrier Detect) and CTS (Clear To Send).
+ */
+static void men_z135_handle_modem_status(struct men_z135_port *uart)
+{
+ if (uart->stat_reg & MEN_Z135_MSR_DDCD)
+ uart_handle_dcd_change(&uart->port,
+ uart->stat_reg & ~MEN_Z135_MSR_DCD);
+ if (uart->stat_reg & MEN_Z135_MSR_DCTS)
+ uart_handle_cts_change(&uart->port,
+ uart->stat_reg & ~MEN_Z135_MSR_CTS);
+}
+
+static void men_z135_handle_lsr(struct men_z135_port *uart)
+{
+ struct uart_port *port = &uart->port;
+ u8 lsr;
+
+ lsr = (uart->stat_reg >> 16) & 0xff;
+
+ if (lsr & MEN_Z135_LSR_OE)
+ port->icount.overrun++;
+ if (lsr & MEN_Z135_LSR_PE)
+ port->icount.parity++;
+ if (lsr & MEN_Z135_LSR_FE)
+ port->icount.frame++;
+ if (lsr & MEN_Z135_LSR_BI) {
+ port->icount.brk++;
+ uart_handle_break(port);
+ }
+}
+
+/**
+ * get_rx_fifo_content() - Get the number of bytes in RX FIFO
+ * @uart: The UART port
+ *
+ * Read RXC register from hardware and return current FIFO fill size.
+ */
+static u16 get_rx_fifo_content(struct men_z135_port *uart)
+{
+ struct uart_port *port = &uart->port;
+ u32 stat_reg;
+ u16 rxc;
+ u8 rxc_lo;
+ u8 rxc_hi;
+
+ stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+ rxc_lo = stat_reg >> 24;
+ rxc_hi = (stat_reg & 0xC0) >> 6;
+
+ rxc = rxc_lo | (rxc_hi << 8);
+
+ return rxc;
+}
+
+/**
+ * men_z135_handle_rx() - RX tasklet routine
+ * @arg: Pointer to struct men_z135_port
+ *
+ * Copy from RX FIFO and acknowledge number of bytes copied.
+ */
+static void men_z135_handle_rx(struct men_z135_port *uart)
+{
+ struct uart_port *port = &uart->port;
+ struct tty_port *tport = &port->state->port;
+ int copied;
+ u16 size;
+ int room;
+
+ size = get_rx_fifo_content(uart);
+
+ if (size == 0)
+ return;
+
+ /* Avoid accidently accessing TX FIFO instead of RX FIFO. Last
+ * longword in RX FIFO cannot be read.(0x004-0x3FF)
+ */
+ if (size > MEN_Z135_FIFO_WATERMARK)
+ size = MEN_Z135_FIFO_WATERMARK;
+
+ room = tty_buffer_request_room(tport, size);
+ if (room != size)
+ dev_warn(&uart->mdev->dev,
+ "Not enough room in flip buffer, truncating to %d\n",
+ room);
+
+ if (room == 0)
+ return;
+
+ memcpy_fromio(uart->rxbuf, port->membase + MEN_Z135_RX_RAM, room);
+ /* Be sure to first copy all data and then acknowledge it */
+ mb();
+ iowrite32(room, port->membase + MEN_Z135_RX_CTRL);
+
+ copied = tty_insert_flip_string(tport, uart->rxbuf, room);
+ if (copied != room)
+ dev_warn(&uart->mdev->dev,
+ "Only copied %d instead of %d bytes\n",
+ copied, room);
+
+ port->icount.rx += copied;
+
+ tty_flip_buffer_push(tport);
+
+}
+
+/**
+ * men_z135_handle_tx() - TX tasklet routine
+ * @arg: Pointer to struct men_z135_port
+ *
+ */
+static void men_z135_handle_tx(struct men_z135_port *uart)
+{
+ struct uart_port *port = &uart->port;
+ struct circ_buf *xmit = &port->state->xmit;
+ u32 txc;
+ u32 wptr;
+ int qlen;
+ int n;
+ int txfree;
+ int head;
+ int tail;
+ int s;
+
+ if (uart_circ_empty(xmit))
+ goto out;
+
+ if (uart_tx_stopped(port))
+ goto out;
+
+ if (port->x_char)
+ goto out;
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+
+ /* calculate bytes to copy */
+ qlen = uart_circ_chars_pending(xmit);
+ if (qlen <= 0)
+ goto out;
+
+ wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
+ txc = (wptr >> 16) & 0x3ff;
+ wptr &= 0x3ff;
+
+ if (txc > MEN_Z135_FIFO_WATERMARK)
+ txc = MEN_Z135_FIFO_WATERMARK;
+
+ txfree = MEN_Z135_FIFO_WATERMARK - txc;
+ if (txfree <= 0) {
+ pr_err("Not enough room in TX FIFO have %d, need %d\n",
+ txfree, qlen);
+ goto irq_en;
+ }
+
+ /* if we're not aligned, it's better to copy only 1 or 2 bytes and
+ * then the rest.
+ */
+ if (align && qlen >= 3 && BYTES_TO_ALIGN(wptr))
+ n = 4 - BYTES_TO_ALIGN(wptr);
+ else if (qlen > txfree)
+ n = txfree;
+ else
+ n = qlen;
+
+ if (n <= 0)
+ goto irq_en;
+
+ head = xmit->head & (UART_XMIT_SIZE - 1);
+ tail = xmit->tail & (UART_XMIT_SIZE - 1);
+
+ s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
+ n = min(n, s);
+
+ memcpy_toio(port->membase + MEN_Z135_TX_RAM, &xmit->buf[xmit->tail], n);
+ xmit->tail = (xmit->tail + n) & (UART_XMIT_SIZE - 1);
+ mmiowb();
+
+ iowrite32(n & 0x3ff, port->membase + MEN_Z135_TX_CTRL);
+
+ port->icount.tx += n;
+
+irq_en:
+ if (!uart_circ_empty(xmit))
+ men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+ else
+ men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+
+out:
+ return;
+
+}
+
+/**
+ * men_z135_intr() - Handle legacy IRQs
+ * @irq: The IRQ number
+ * @data: Pointer to UART port
+ *
+ * Check IIR register to see which tasklet to start.
+ */
+static irqreturn_t men_z135_intr(int irq, void *data)
+{
+ struct men_z135_port *uart = (struct men_z135_port *)data;
+ struct uart_port *port = &uart->port;
+ int irq_id;
+
+ uart->stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+ /* IRQ pending is low active */
+ if (IS_IRQ(uart->stat_reg))
+ return IRQ_NONE;
+
+ irq_id = IRQ_ID(uart->stat_reg);
+ switch (irq_id) {
+ case MEN_Z135_IRQ_ID_MST:
+ men_z135_handle_modem_status(uart);
+ break;
+ case MEN_Z135_IRQ_ID_TSA:
+ men_z135_handle_tx(uart);
+ break;
+ case MEN_Z135_IRQ_ID_CTI:
+ dev_dbg(&uart->mdev->dev, "Character Timeout Indication\n");
+ /* Fallthrough */
+ case MEN_Z135_IRQ_ID_RDA:
+ /* Reading data clears RX IRQ */
+ men_z135_handle_rx(uart);
+ break;
+ case MEN_Z135_IRQ_ID_RLS:
+ men_z135_handle_lsr(uart);
+ break;
+ default:
+ dev_warn(&uart->mdev->dev, "Unknown IRQ id %d\n", irq_id);
+ return IRQ_NONE;
+ }
+
+ return IRQ_HANDLED;
+}
+
+/**
+ * men_z135_request_irq() - Request IRQ for 16z135 core
+ * @uart: z135 private uart port structure
+ *
+ * Request an IRQ for 16z135 to use. First try using MSI, if it fails
+ * fall back to using legacy interrupts.
+ */
+static int men_z135_request_irq(struct men_z135_port *uart)
+{
+ struct device *dev = &uart->mdev->dev;
+ struct uart_port *port = &uart->port;
+ int err = 0;
+
+ err = request_irq(port->irq, men_z135_intr, IRQF_SHARED,
+ "men_z135_intr", uart);
+ if (err)
+ dev_err(dev, "Error %d getting interrupt\n", err);
+
+ return err;
+}
+
+/**
+ * men_z135_tx_empty() - Handle tx_empty call
+ * @port: The UART port
+ *
+ * This function tests whether the TX FIFO and shifter for the port
+ * described by @port is empty.
+ */
+static unsigned int men_z135_tx_empty(struct uart_port *port)
+{
+ u32 wptr;
+ u16 txc;
+
+ wptr = ioread32(port->membase + MEN_Z135_TX_CTRL);
+ txc = (wptr >> 16) & 0x3ff;
+
+ if (txc == 0)
+ return TIOCSER_TEMT;
+ else
+ return 0;
+}
+
+/**
+ * men_z135_set_mctrl() - Set modem control lines
+ * @port: The UART port
+ * @mctrl: The modem control lines
+ *
+ * This function sets the modem control lines for a port described by @port
+ * to the state described by @mctrl
+ */
+static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+ u32 conf_reg = 0;
+
+ if (mctrl & TIOCM_RTS)
+ conf_reg |= MEN_Z135_MCR_RTS;
+ if (mctrl & TIOCM_DTR)
+ conf_reg |= MEN_Z135_MCR_DTR;
+ if (mctrl & TIOCM_OUT1)
+ conf_reg |= MEN_Z135_MCR_OUT1;
+ if (mctrl & TIOCM_OUT2)
+ conf_reg |= MEN_Z135_MCR_OUT2;
+ if (mctrl & TIOCM_LOOP)
+ conf_reg |= MEN_Z135_MCR_LOOP;
+
+ men_z135_reg_set(uart, MEN_Z135_CONF_REG, conf_reg);
+}
+
+/**
+ * men_z135_get_mctrl() - Get modem control lines
+ * @port: The UART port
+ *
+ * Retruns the current state of modem control inputs.
+ */
+static unsigned int men_z135_get_mctrl(struct uart_port *port)
+{
+ unsigned int mctrl = 0;
+ u32 stat_reg;
+ u8 msr;
+
+ stat_reg = ioread32(port->membase + MEN_Z135_STAT_REG);
+
+ msr = ~((stat_reg >> 8) & 0xff);
+
+ if (msr & MEN_Z135_MSR_CTS)
+ mctrl |= TIOCM_CTS;
+ if (msr & MEN_Z135_MSR_DSR)
+ mctrl |= TIOCM_DSR;
+ if (msr & MEN_Z135_MSR_RI)
+ mctrl |= TIOCM_RI;
+ if (msr & MEN_Z135_MSR_DCD)
+ mctrl |= TIOCM_CAR;
+
+ return mctrl;
+}
+
+/**
+ * men_z135_stop_tx() - Stop transmitting characters
+ * @port: The UART port
+ *
+ * Stop transmitting characters. This might be due to CTS line becomming
+ * inactive or the tty layer indicating we want to stop transmission due to
+ * an XOFF character.
+ */
+static void men_z135_stop_tx(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+
+ men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_TXCIEN);
+}
+
+/**
+ * men_z135_start_tx() - Start transmitting characters
+ * @port: The UART port
+ *
+ * Start transmitting character. This actually doesn't transmit anything, but
+ * fires off the TX tasklet.
+ */
+static void men_z135_start_tx(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+
+ men_z135_handle_tx(uart);
+}
+
+/**
+ * men_z135_stop_rx() - Stop receiving characters
+ * @port: The UART port
+ *
+ * Stop receiving characters; the port is in the process of being closed.
+ */
+static void men_z135_stop_rx(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+
+ men_z135_reg_clr(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_RXCIEN);
+}
+
+/**
+ * men_z135_enable_ms() - Enable Modem Status
+ * port:
+ *
+ * Enable Modem Status IRQ.
+ */
+static void men_z135_enable_ms(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+
+ men_z135_reg_set(uart, MEN_Z135_CONF_REG, MEN_Z135_IER_MSIEN);
+}
+
+static int men_z135_startup(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+ int err;
+ u32 conf_reg = 0;
+
+ err = men_z135_request_irq(uart);
+ if (err)
+ return -ENODEV;
+
+ conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
+
+ conf_reg |= MEN_Z135_ALL_IRQS;
+ conf_reg &= ~(0xff << 16);
+ conf_reg |= (txlvl << 16);
+ conf_reg |= (rxlvl << 20);
+
+ iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
+
+ return 0;
+}
+
+static void men_z135_shutdown(struct uart_port *port)
+{
+ struct men_z135_port *uart = to_men_z135(port);
+ u32 conf_reg = 0;
+
+ conf_reg |= MEN_Z135_ALL_IRQS;
+
+ men_z135_reg_clr(uart, MEN_Z135_CONF_REG, conf_reg);
+
+ free_irq(uart->port.irq, uart);
+}
+
+static void men_z135_set_termios(struct uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
+{
+ unsigned int baud;
+ u32 conf_reg;
+ u32 bd_reg;
+ u32 uart_freq;
+ u8 lcr;
+
+ conf_reg = ioread32(port->membase + MEN_Z135_CONF_REG);
+ lcr = LCR(conf_reg);
+
+ /* byte size */
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ lcr |= MEN_Z135_WL5;
+ break;
+ case CS6:
+ lcr |= MEN_Z135_WL6;
+ break;
+ case CS7:
+ lcr |= MEN_Z135_WL7;
+ break;
+ case CS8:
+ lcr |= MEN_Z135_WL8;
+ break;
+ }
+
+ /* stop bits */
+ if (termios->c_cflag & CSTOPB)
+ lcr |= MEN_Z135_NSTB2 << MEN_Z135_STB_SHIFT;
+
+ /* parity */
+ if (termios->c_cflag & PARENB) {
+ lcr |= MEN_Z135_PAR_ENA << MEN_Z135_PEN_SHIFT;
+
+ if (termios->c_cflag & PARODD)
+ lcr |= MEN_Z135_PTY_ODD << MEN_Z135_PTY_SHIFT;
+ else
+ lcr |= MEN_Z135_PTY_EVN << MEN_Z135_PTY_SHIFT;
+ } else
+ lcr |= MEN_Z135_PAR_DIS << MEN_Z135_PEN_SHIFT;
+
+ termios->c_cflag &= ~CMSPAR; /* Mark/Space parity is not supported */
+
+ conf_reg |= lcr << MEN_Z135_LCR_SHIFT;
+ iowrite32(conf_reg, port->membase + MEN_Z135_CONF_REG);
+
+ uart_freq = ioread32(port->membase + MEN_Z135_UART_FREQ);
+ if (uart_freq == 0)
+ uart_freq = MEN_Z135_BASECLK;
+
+ baud = uart_get_baud_rate(port, termios, old, 0, uart_freq / 16);
+
+ spin_lock(&port->lock);
+ if (tty_termios_baud_rate(termios))
+ tty_termios_encode_baud_rate(termios, baud, baud);
+
+ bd_reg = uart_freq / (4 * baud);
+ iowrite32(bd_reg, port->membase + MEN_Z135_BAUD_REG);
+
+ uart_update_timeout(port, termios->c_cflag, baud);
+ spin_unlock(&port->lock);
+}
+
+static const char *men_z135_type(struct uart_port *port)
+{
+ return KBUILD_MODNAME;
+}
+
+static void men_z135_release_port(struct uart_port *port)
+{
+ iounmap(port->membase);
+ port->membase = NULL;
+
+ release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+}
+
+static int men_z135_request_port(struct uart_port *port)
+{
+ int size = MEN_Z135_MEM_SIZE;
+
+ if (!request_mem_region(port->mapbase, size, "men_z135_port"))
+ return -EBUSY;
+
+ port->membase = ioremap(port->mapbase, MEN_Z135_MEM_SIZE);
+ if (port->membase == NULL) {
+ release_mem_region(port->mapbase, MEN_Z135_MEM_SIZE);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void men_z135_config_port(struct uart_port *port, int type)
+{
+ port->type = PORT_MEN_Z135;
+ men_z135_request_port(port);
+}
+
+static int men_z135_verify_port(struct uart_port *port,
+ struct serial_struct *serinfo)
+{
+ return -EINVAL;
+}
+
+static struct uart_ops men_z135_ops = {
+ .tx_empty = men_z135_tx_empty,
+ .set_mctrl = men_z135_set_mctrl,
+ .get_mctrl = men_z135_get_mctrl,
+ .stop_tx = men_z135_stop_tx,
+ .start_tx = men_z135_start_tx,
+ .stop_rx = men_z135_stop_rx,
+ .enable_ms = men_z135_enable_ms,
+ .startup = men_z135_startup,
+ .shutdown = men_z135_shutdown,
+ .set_termios = men_z135_set_termios,
+ .type = men_z135_type,
+ .release_port = men_z135_release_port,
+ .request_port = men_z135_request_port,
+ .config_port = men_z135_config_port,
+ .verify_port = men_z135_verify_port,
+};
+
+static struct uart_driver men_z135_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = KBUILD_MODNAME,
+ .dev_name = "ttyHSU",
+ .major = 0,
+ .minor = 0,
+ .nr = MEN_Z135_MAX_PORTS,
+};
+
+/**
+ * men_z135_probe() - Probe a z135 instance
+ * @mdev: The MCB device
+ * @id: The MCB device ID
+ *
+ * men_z135_probe does the basic setup of hardware resources and registers the
+ * new uart port to the tty layer.
+ */
+static int men_z135_probe(struct mcb_device *mdev,
+ const struct mcb_device_id *id)
+{
+ struct men_z135_port *uart;
+ struct resource *mem;
+ struct device *dev;
+ int err;
+
+ dev = &mdev->dev;
+
+ uart = devm_kzalloc(dev, sizeof(struct men_z135_port), GFP_KERNEL);
+ if (!uart)
+ return -ENOMEM;
+
+ uart->rxbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
+ if (!uart->rxbuf)
+ return -ENOMEM;
+
+ mem = &mdev->mem;
+
+ mcb_set_drvdata(mdev, uart);
+
+ uart->port.uartclk = MEN_Z135_BASECLK * 16;
+ uart->port.fifosize = MEN_Z135_FIFO_SIZE;
+ uart->port.iotype = UPIO_MEM;
+ uart->port.ops = &men_z135_ops;
+ uart->port.irq = mcb_get_irq(mdev);
+ uart->port.iotype = UPIO_MEM;
+ uart->port.flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+ uart->port.line = line++;
+ uart->port.dev = dev;
+ uart->port.type = PORT_MEN_Z135;
+ uart->port.mapbase = mem->start;
+ uart->port.membase = NULL;
+ uart->mdev = mdev;
+
+ spin_lock_init(&uart->port.lock);
+ spin_lock_init(&uart->lock);
+
+ err = uart_add_one_port(&men_z135_driver, &uart->port);
+ if (err)
+ goto err;
+
+ return 0;
+
+err:
+ free_page((unsigned long) uart->rxbuf);
+ dev_err(dev, "Failed to add UART: %d\n", err);
+
+ return err;
+}
+
+/**
+ * men_z135_remove() - Remove a z135 instance from the system
+ *
+ * @mdev: The MCB device
+ */
+static void men_z135_remove(struct mcb_device *mdev)
+{
+ struct men_z135_port *uart = mcb_get_drvdata(mdev);
+
+ line--;
+ uart_remove_one_port(&men_z135_driver, &uart->port);
+ free_page((unsigned long) uart->rxbuf);
+}
+
+static const struct mcb_device_id men_z135_ids[] = {
+ { .device = 0x87 },
+};
+MODULE_DEVICE_TABLE(mcb, men_z135_ids);
+
+static struct mcb_driver mcb_driver = {
+ .driver = {
+ .name = "z135-uart",
+ .owner = THIS_MODULE,
+ },
+ .probe = men_z135_probe,
+ .remove = men_z135_remove,
+ .id_table = men_z135_ids,
+};
+
+/**
+ * men_z135_init() - Driver Registration Routine
+ *
+ * men_z135_init is the first routine called when the driver is loaded. All it
+ * does is register with the legacy MEN Chameleon subsystem.
+ */
+static int __init men_z135_init(void)
+{
+ int err;
+
+ err = uart_register_driver(&men_z135_driver);
+ if (err) {
+ pr_err("Failed to register UART: %d\n", err);
+ return err;
+ }
+
+ err = mcb_register_driver(&mcb_driver);
+ if (err) {
+ pr_err("Failed to register MCB driver: %d\n", err);
+ uart_unregister_driver(&men_z135_driver);
+ return err;
+ }
+
+ return 0;
+}
+module_init(men_z135_init);
+
+/**
+ * men_z135_exit() - Driver Exit Routine
+ *
+ * men_z135_exit is called just before the driver is removed from memory.
+ */
+static void __exit men_z135_exit(void)
+{
+ mcb_unregister_driver(&mcb_driver);
+ uart_unregister_driver(&men_z135_driver);
+}
+module_exit(men_z135_exit);
+
+MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MEN 16z135 High Speed UART");
+MODULE_ALIAS("mcb:16z135");
diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 7fd6aaa..be127d0 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -29,7 +29,7 @@
#include <asm/irq.h>
#include <asm/parisc-device.h>
-#ifdef CONFIG_MAGIC_SYSRQ
+#if defined(CONFIG_SERIAL_MUX_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#include <linux/sysrq.h>
#define SUPPORT_SYSRQ
#endif
@@ -613,7 +613,7 @@
{
/* Delete the Mux timer. */
if(port_cnt > 0) {
- del_timer(&mux_timer);
+ del_timer_sync(&mux_timer);
#ifdef CONFIG_SERIAL_MUX_CONSOLE
unregister_console(&mux_console);
#endif
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 08b6b94..d017cec 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -163,10 +163,6 @@
u8 wakeups_enabled;
u32 features;
- int DTR_gpio;
- int DTR_inverted;
- int DTR_active;
-
struct serial_rs485 rs485;
int rts_gpio;
@@ -184,8 +180,6 @@
/* Forward declaration of functions */
static void serial_omap_mdr1_errataset(struct uart_omap_port *up, u8 mdr1);
-static struct workqueue_struct *serial_omap_uart_wq;
-
static inline unsigned int serial_in(struct uart_omap_port *up, int offset)
{
offset <<= up->port.regshift;
@@ -398,11 +392,8 @@
break;
} while (--count > 0);
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
- spin_unlock(&up->port.lock);
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
- spin_lock(&up->port.lock);
- }
if (uart_circ_empty(xmit))
serial_omap_stop_tx(&up->port);
@@ -697,16 +688,6 @@
serial_out(up, UART_MCR, up->mcr);
pm_runtime_mark_last_busy(up->dev);
pm_runtime_put_autosuspend(up->dev);
-
- if (gpio_is_valid(up->DTR_gpio) &&
- !!(mctrl & TIOCM_DTR) != up->DTR_active) {
- up->DTR_active = !up->DTR_active;
- if (gpio_cansleep(up->DTR_gpio))
- schedule_work(&up->qos_work);
- else
- gpio_set_value(up->DTR_gpio,
- up->DTR_active != up->DTR_inverted);
- }
}
static void serial_omap_break_ctl(struct uart_port *port, int break_state)
@@ -850,9 +831,6 @@
qos_work);
pm_qos_update_request(&up->pm_qos_request, up->latency);
- if (gpio_is_valid(up->DTR_gpio))
- gpio_set_value_cansleep(up->DTR_gpio,
- up->DTR_active != up->DTR_inverted);
}
static void
@@ -1420,7 +1398,7 @@
switch (cmd) {
case TIOCSRS485:
- if (copy_from_user(&rs485conf, (struct serial_rs485 *) arg,
+ if (copy_from_user(&rs485conf, (void __user *) arg,
sizeof(rs485conf)))
return -EFAULT;
@@ -1428,7 +1406,7 @@
break;
case TIOCGRS485:
- if (copy_to_user((struct serial_rs485 *) arg,
+ if (copy_to_user((void __user *) arg,
&(to_uart_omap_port(port)->rs485),
sizeof(rs485conf)))
return -EFAULT;
@@ -1614,7 +1592,7 @@
/* check for tx enable gpio */
up->rts_gpio = of_get_named_gpio_flags(np, "rts-gpio", 0, &flags);
if (gpio_is_valid(up->rts_gpio)) {
- ret = gpio_request(up->rts_gpio, "omap-serial");
+ ret = devm_gpio_request(up->dev, up->rts_gpio, "omap-serial");
if (ret < 0)
return ret;
ret = gpio_direction_output(up->rts_gpio,
@@ -1644,10 +1622,13 @@
static int serial_omap_probe(struct platform_device *pdev)
{
- struct uart_omap_port *up;
- struct resource *mem, *irq;
struct omap_uart_port_info *omap_up_info = dev_get_platdata(&pdev->dev);
- int ret, uartirq = 0, wakeirq = 0;
+ struct uart_omap_port *up;
+ struct resource *mem;
+ void __iomem *base;
+ int uartirq = 0;
+ int wakeirq = 0;
+ int ret;
/* The optional wakeirq may be specified in the board dts file */
if (pdev->dev.of_node) {
@@ -1658,48 +1639,19 @@
omap_up_info = of_get_uart_port_info(&pdev->dev);
pdev->dev.platform_data = omap_up_info;
} else {
- irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
- if (!irq) {
- dev_err(&pdev->dev, "no irq resource?\n");
- return -ENODEV;
- }
- uartirq = irq->start;
- }
-
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem) {
- dev_err(&pdev->dev, "no mem resource?\n");
- return -ENODEV;
- }
-
- if (!devm_request_mem_region(&pdev->dev, mem->start, resource_size(mem),
- pdev->dev.driver->name)) {
- dev_err(&pdev->dev, "memory region already claimed\n");
- return -EBUSY;
- }
-
- if (gpio_is_valid(omap_up_info->DTR_gpio) &&
- omap_up_info->DTR_present) {
- ret = gpio_request(omap_up_info->DTR_gpio, "omap-serial");
- if (ret < 0)
- return ret;
- ret = gpio_direction_output(omap_up_info->DTR_gpio,
- omap_up_info->DTR_inverted);
- if (ret < 0)
- return ret;
+ uartirq = platform_get_irq(pdev, 0);
+ if (uartirq < 0)
+ return -EPROBE_DEFER;
}
up = devm_kzalloc(&pdev->dev, sizeof(*up), GFP_KERNEL);
if (!up)
return -ENOMEM;
- if (gpio_is_valid(omap_up_info->DTR_gpio) &&
- omap_up_info->DTR_present) {
- up->DTR_gpio = omap_up_info->DTR_gpio;
- up->DTR_inverted = omap_up_info->DTR_inverted;
- } else
- up->DTR_gpio = -EINVAL;
- up->DTR_active = 0;
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, mem);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
up->dev = &pdev->dev;
up->port.dev = &pdev->dev;
@@ -1733,14 +1685,7 @@
sprintf(up->name, "OMAP UART%d", up->port.line);
up->port.mapbase = mem->start;
- up->port.membase = devm_ioremap(&pdev->dev, mem->start,
- resource_size(mem));
- if (!up->port.membase) {
- dev_err(&pdev->dev, "can't ioremap UART\n");
- ret = -ENOMEM;
- goto err_ioremap;
- }
-
+ up->port.membase = base;
up->port.flags = omap_up_info->flags;
up->port.uartclk = omap_up_info->uartclk;
if (!up->port.uartclk) {
@@ -1754,12 +1699,12 @@
up->calc_latency = PM_QOS_CPU_DMA_LAT_DEFAULT_VALUE;
pm_qos_add_request(&up->pm_qos_request,
PM_QOS_CPU_DMA_LATENCY, up->latency);
- serial_omap_uart_wq = create_singlethread_workqueue(up->name);
INIT_WORK(&up->qos_work, serial_omap_uart_qos_work);
platform_set_drvdata(pdev, up);
if (omap_up_info->autosuspend_timeout == 0)
omap_up_info->autosuspend_timeout = -1;
+
device_init_wakeup(up->dev, true);
pm_runtime_use_autosuspend(&pdev->dev);
pm_runtime_set_autosuspend_delay(&pdev->dev,
@@ -1786,7 +1731,6 @@
err_add_port:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
-err_ioremap:
err_rs485:
err_port_line:
dev_err(&pdev->dev, "[UART%d]: failure [%s]: %d\n",
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 0931b3f..0cb6a8e 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -257,6 +257,8 @@
dma_addr_t rx_buf_dma;
struct dentry *debugfs;
+#define IRQ_NAME_SIZE 17
+ char irq_name[IRQ_NAME_SIZE];
/* protect the eg20t_port private structure and io access to membase */
spinlock_t lock;
@@ -1343,7 +1345,7 @@
return ret;
ret = request_irq(priv->port.irq, pch_uart_interrupt, IRQF_SHARED,
- KBUILD_MODNAME, priv);
+ priv->irq_name, priv);
if (ret < 0)
return ret;
@@ -1588,13 +1590,8 @@
wait_for_xmitr(priv, UART_LSR_THRE);
/*
* Send the character out.
- * If a LF, also do CR...
*/
iowrite8(c, priv->membase + PCH_UART_THR);
- if (c == 10) {
- wait_for_xmitr(priv, UART_LSR_THRE);
- iowrite8(13, priv->membase + PCH_UART_THR);
- }
/*
* Finally, wait for transmitter to become empty
@@ -1818,6 +1815,10 @@
priv->port.line = board->line_no;
priv->trigger = PCH_UART_HAL_TRIGGER_M;
+ snprintf(priv->irq_name, IRQ_NAME_SIZE,
+ KBUILD_MODNAME ":" PCH_UART_DRIVER_DEVICE "%d",
+ priv->port.line);
+
spin_lock_init(&priv->port.lock);
pci_set_drvdata(pdev, priv);
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index f9f20f3..9e7ee39 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -711,13 +711,8 @@
wait_for_xmitr(up);
/*
* Send the character out.
- * If a LF, also do CR...
*/
serial_out(up, UART_TX, c);
- if (c == 10) {
- wait_for_xmitr(up);
- serial_out(up, UART_TX, 13);
- }
/*
* Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
new file mode 100644
index 0000000..7206a64
--- /dev/null
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -0,0 +1,1280 @@
+/*
+ * SC16IS7xx tty serial driver - Copyright (C) 2014 GridPoint
+ * Author: Jon Ringle <jringle@gridpoint.com>
+ *
+ * Based on max310x.c, by Alexander Shiyan <shc_work@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/serial_core.h>
+#include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/uaccess.h>
+
+#define SC16IS7XX_NAME "sc16is7xx"
+
+/* SC16IS7XX register definitions */
+#define SC16IS7XX_RHR_REG (0x00) /* RX FIFO */
+#define SC16IS7XX_THR_REG (0x00) /* TX FIFO */
+#define SC16IS7XX_IER_REG (0x01) /* Interrupt enable */
+#define SC16IS7XX_IIR_REG (0x02) /* Interrupt Identification */
+#define SC16IS7XX_FCR_REG (0x02) /* FIFO control */
+#define SC16IS7XX_LCR_REG (0x03) /* Line Control */
+#define SC16IS7XX_MCR_REG (0x04) /* Modem Control */
+#define SC16IS7XX_LSR_REG (0x05) /* Line Status */
+#define SC16IS7XX_MSR_REG (0x06) /* Modem Status */
+#define SC16IS7XX_SPR_REG (0x07) /* Scratch Pad */
+#define SC16IS7XX_TXLVL_REG (0x08) /* TX FIFO level */
+#define SC16IS7XX_RXLVL_REG (0x09) /* RX FIFO level */
+#define SC16IS7XX_IODIR_REG (0x0a) /* I/O Direction
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_IOSTATE_REG (0x0b) /* I/O State
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_IOINTENA_REG (0x0c) /* I/O Interrupt Enable
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_IOCONTROL_REG (0x0e) /* I/O Control
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_EFCR_REG (0x0f) /* Extra Features Control */
+
+/* TCR/TLR Register set: Only if ((MCR[2] == 1) && (EFR[4] == 1)) */
+#define SC16IS7XX_TCR_REG (0x06) /* Transmit control */
+#define SC16IS7XX_TLR_REG (0x07) /* Trigger level */
+
+/* Special Register set: Only if ((LCR[7] == 1) && (LCR != 0xBF)) */
+#define SC16IS7XX_DLL_REG (0x00) /* Divisor Latch Low */
+#define SC16IS7XX_DLH_REG (0x01) /* Divisor Latch High */
+
+/* Enhanced Register set: Only if (LCR == 0xBF) */
+#define SC16IS7XX_EFR_REG (0x02) /* Enhanced Features */
+#define SC16IS7XX_XON1_REG (0x04) /* Xon1 word */
+#define SC16IS7XX_XON2_REG (0x05) /* Xon2 word */
+#define SC16IS7XX_XOFF1_REG (0x06) /* Xoff1 word */
+#define SC16IS7XX_XOFF2_REG (0x07) /* Xoff2 word */
+
+/* IER register bits */
+#define SC16IS7XX_IER_RDI_BIT (1 << 0) /* Enable RX data interrupt */
+#define SC16IS7XX_IER_THRI_BIT (1 << 1) /* Enable TX holding register
+ * interrupt */
+#define SC16IS7XX_IER_RLSI_BIT (1 << 2) /* Enable RX line status
+ * interrupt */
+#define SC16IS7XX_IER_MSI_BIT (1 << 3) /* Enable Modem status
+ * interrupt */
+
+/* IER register bits - write only if (EFR[4] == 1) */
+#define SC16IS7XX_IER_SLEEP_BIT (1 << 4) /* Enable Sleep mode */
+#define SC16IS7XX_IER_XOFFI_BIT (1 << 5) /* Enable Xoff interrupt */
+#define SC16IS7XX_IER_RTSI_BIT (1 << 6) /* Enable nRTS interrupt */
+#define SC16IS7XX_IER_CTSI_BIT (1 << 7) /* Enable nCTS interrupt */
+
+/* FCR register bits */
+#define SC16IS7XX_FCR_FIFO_BIT (1 << 0) /* Enable FIFO */
+#define SC16IS7XX_FCR_RXRESET_BIT (1 << 1) /* Reset RX FIFO */
+#define SC16IS7XX_FCR_TXRESET_BIT (1 << 2) /* Reset TX FIFO */
+#define SC16IS7XX_FCR_RXLVLL_BIT (1 << 6) /* RX Trigger level LSB */
+#define SC16IS7XX_FCR_RXLVLH_BIT (1 << 7) /* RX Trigger level MSB */
+
+/* FCR register bits - write only if (EFR[4] == 1) */
+#define SC16IS7XX_FCR_TXLVLL_BIT (1 << 4) /* TX Trigger level LSB */
+#define SC16IS7XX_FCR_TXLVLH_BIT (1 << 5) /* TX Trigger level MSB */
+
+/* IIR register bits */
+#define SC16IS7XX_IIR_NO_INT_BIT (1 << 0) /* No interrupts pending */
+#define SC16IS7XX_IIR_ID_MASK 0x3e /* Mask for the interrupt ID */
+#define SC16IS7XX_IIR_THRI_SRC 0x02 /* TX holding register empty */
+#define SC16IS7XX_IIR_RDI_SRC 0x04 /* RX data interrupt */
+#define SC16IS7XX_IIR_RLSE_SRC 0x06 /* RX line status error */
+#define SC16IS7XX_IIR_RTOI_SRC 0x0c /* RX time-out interrupt */
+#define SC16IS7XX_IIR_MSI_SRC 0x00 /* Modem status interrupt
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_IIR_INPIN_SRC 0x30 /* Input pin change of state
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_IIR_XOFFI_SRC 0x10 /* Received Xoff */
+#define SC16IS7XX_IIR_CTSRTS_SRC 0x20 /* nCTS,nRTS change of state
+ * from active (LOW)
+ * to inactive (HIGH)
+ */
+/* LCR register bits */
+#define SC16IS7XX_LCR_LENGTH0_BIT (1 << 0) /* Word length bit 0 */
+#define SC16IS7XX_LCR_LENGTH1_BIT (1 << 1) /* Word length bit 1
+ *
+ * Word length bits table:
+ * 00 -> 5 bit words
+ * 01 -> 6 bit words
+ * 10 -> 7 bit words
+ * 11 -> 8 bit words
+ */
+#define SC16IS7XX_LCR_STOPLEN_BIT (1 << 2) /* STOP length bit
+ *
+ * STOP length bit table:
+ * 0 -> 1 stop bit
+ * 1 -> 1-1.5 stop bits if
+ * word length is 5,
+ * 2 stop bits otherwise
+ */
+#define SC16IS7XX_LCR_PARITY_BIT (1 << 3) /* Parity bit enable */
+#define SC16IS7XX_LCR_EVENPARITY_BIT (1 << 4) /* Even parity bit enable */
+#define SC16IS7XX_LCR_FORCEPARITY_BIT (1 << 5) /* 9-bit multidrop parity */
+#define SC16IS7XX_LCR_TXBREAK_BIT (1 << 6) /* TX break enable */
+#define SC16IS7XX_LCR_DLAB_BIT (1 << 7) /* Divisor Latch enable */
+#define SC16IS7XX_LCR_WORD_LEN_5 (0x00)
+#define SC16IS7XX_LCR_WORD_LEN_6 (0x01)
+#define SC16IS7XX_LCR_WORD_LEN_7 (0x02)
+#define SC16IS7XX_LCR_WORD_LEN_8 (0x03)
+#define SC16IS7XX_LCR_CONF_MODE_A SC16IS7XX_LCR_DLAB_BIT /* Special
+ * reg set */
+#define SC16IS7XX_LCR_CONF_MODE_B 0xBF /* Enhanced
+ * reg set */
+
+/* MCR register bits */
+#define SC16IS7XX_MCR_DTR_BIT (1 << 0) /* DTR complement
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MCR_RTS_BIT (1 << 1) /* RTS complement */
+#define SC16IS7XX_MCR_TCRTLR_BIT (1 << 2) /* TCR/TLR register enable */
+#define SC16IS7XX_MCR_LOOP_BIT (1 << 4) /* Enable loopback test mode */
+#define SC16IS7XX_MCR_XONANY_BIT (1 << 5) /* Enable Xon Any
+ * - write enabled
+ * if (EFR[4] == 1)
+ */
+#define SC16IS7XX_MCR_IRDA_BIT (1 << 6) /* Enable IrDA mode
+ * - write enabled
+ * if (EFR[4] == 1)
+ */
+#define SC16IS7XX_MCR_CLKSEL_BIT (1 << 7) /* Divide clock by 4
+ * - write enabled
+ * if (EFR[4] == 1)
+ */
+
+/* LSR register bits */
+#define SC16IS7XX_LSR_DR_BIT (1 << 0) /* Receiver data ready */
+#define SC16IS7XX_LSR_OE_BIT (1 << 1) /* Overrun Error */
+#define SC16IS7XX_LSR_PE_BIT (1 << 2) /* Parity Error */
+#define SC16IS7XX_LSR_FE_BIT (1 << 3) /* Frame Error */
+#define SC16IS7XX_LSR_BI_BIT (1 << 4) /* Break Interrupt */
+#define SC16IS7XX_LSR_BRK_ERROR_MASK 0x1E /* BI, FE, PE, OE bits */
+#define SC16IS7XX_LSR_THRE_BIT (1 << 5) /* TX holding register empty */
+#define SC16IS7XX_LSR_TEMT_BIT (1 << 6) /* Transmitter empty */
+#define SC16IS7XX_LSR_FIFOE_BIT (1 << 7) /* Fifo Error */
+
+/* MSR register bits */
+#define SC16IS7XX_MSR_DCTS_BIT (1 << 0) /* Delta CTS Clear To Send */
+#define SC16IS7XX_MSR_DDSR_BIT (1 << 1) /* Delta DSR Data Set Ready
+ * or (IO4)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_DRI_BIT (1 << 2) /* Delta RI Ring Indicator
+ * or (IO7)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_DCD_BIT (1 << 3) /* Delta CD Carrier Detect
+ * or (IO6)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_CTS_BIT (1 << 0) /* CTS */
+#define SC16IS7XX_MSR_DSR_BIT (1 << 1) /* DSR (IO4)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_RI_BIT (1 << 2) /* RI (IO7)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_CD_BIT (1 << 3) /* CD (IO6)
+ * - only on 75x/76x
+ */
+#define SC16IS7XX_MSR_DELTA_MASK 0x0F /* Any of the delta bits! */
+
+/*
+ * TCR register bits
+ * TCR trigger levels are available from 0 to 60 characters with a granularity
+ * of four.
+ * The programmer must program the TCR such that TCR[3:0] > TCR[7:4]. There is
+ * no built-in hardware check to make sure this condition is met. Also, the TCR
+ * must be programmed with this condition before auto RTS or software flow
+ * control is enabled to avoid spurious operation of the device.
+ */
+#define SC16IS7XX_TCR_RX_HALT(words) ((((words) / 4) & 0x0f) << 0)
+#define SC16IS7XX_TCR_RX_RESUME(words) ((((words) / 4) & 0x0f) << 4)
+
+/*
+ * TLR register bits
+ * If TLR[3:0] or TLR[7:4] are logical 0, the selectable trigger levels via the
+ * FIFO Control Register (FCR) are used for the transmit and receive FIFO
+ * trigger levels. Trigger levels from 4 characters to 60 characters are
+ * available with a granularity of four.
+ *
+ * When the trigger level setting in TLR is zero, the SC16IS740/750/760 uses the
+ * trigger level setting defined in FCR. If TLR has non-zero trigger level value
+ * the trigger level defined in FCR is discarded. This applies to both transmit
+ * FIFO and receive FIFO trigger level setting.
+ *
+ * When TLR is used for RX trigger level control, FCR[7:6] should be left at the
+ * default state, that is, '00'.
+ */
+#define SC16IS7XX_TLR_TX_TRIGGER(words) ((((words) / 4) & 0x0f) << 0)
+#define SC16IS7XX_TLR_RX_TRIGGER(words) ((((words) / 4) & 0x0f) << 4)
+
+/* IOControl register bits (Only 750/760) */
+#define SC16IS7XX_IOCONTROL_LATCH_BIT (1 << 0) /* Enable input latching */
+#define SC16IS7XX_IOCONTROL_GPIO_BIT (1 << 1) /* Enable GPIO[7:4] */
+#define SC16IS7XX_IOCONTROL_SRESET_BIT (1 << 3) /* Software Reset */
+
+/* EFCR register bits */
+#define SC16IS7XX_EFCR_9BIT_MODE_BIT (1 << 0) /* Enable 9-bit or Multidrop
+ * mode (RS485) */
+#define SC16IS7XX_EFCR_RXDISABLE_BIT (1 << 1) /* Disable receiver */
+#define SC16IS7XX_EFCR_TXDISABLE_BIT (1 << 2) /* Disable transmitter */
+#define SC16IS7XX_EFCR_AUTO_RS485_BIT (1 << 4) /* Auto RS485 RTS direction */
+#define SC16IS7XX_EFCR_RTS_INVERT_BIT (1 << 5) /* RTS output inversion */
+#define SC16IS7XX_EFCR_IRDA_MODE_BIT (1 << 7) /* IrDA mode
+ * 0 = rate upto 115.2 kbit/s
+ * - Only 750/760
+ * 1 = rate upto 1.152 Mbit/s
+ * - Only 760
+ */
+
+/* EFR register bits */
+#define SC16IS7XX_EFR_AUTORTS_BIT (1 << 6) /* Auto RTS flow ctrl enable */
+#define SC16IS7XX_EFR_AUTOCTS_BIT (1 << 7) /* Auto CTS flow ctrl enable */
+#define SC16IS7XX_EFR_XOFF2_DETECT_BIT (1 << 5) /* Enable Xoff2 detection */
+#define SC16IS7XX_EFR_ENABLE_BIT (1 << 4) /* Enable enhanced functions
+ * and writing to IER[7:4],
+ * FCR[5:4], MCR[7:5]
+ */
+#define SC16IS7XX_EFR_SWFLOW3_BIT (1 << 3) /* SWFLOW bit 3 */
+#define SC16IS7XX_EFR_SWFLOW2_BIT (1 << 2) /* SWFLOW bit 2
+ *
+ * SWFLOW bits 3 & 2 table:
+ * 00 -> no transmitter flow
+ * control
+ * 01 -> transmitter generates
+ * XON2 and XOFF2
+ * 10 -> transmitter generates
+ * XON1 and XOFF1
+ * 11 -> transmitter generates
+ * XON1, XON2, XOFF1 and
+ * XOFF2
+ */
+#define SC16IS7XX_EFR_SWFLOW1_BIT (1 << 1) /* SWFLOW bit 2 */
+#define SC16IS7XX_EFR_SWFLOW0_BIT (1 << 0) /* SWFLOW bit 3
+ *
+ * SWFLOW bits 3 & 2 table:
+ * 00 -> no received flow
+ * control
+ * 01 -> receiver compares
+ * XON2 and XOFF2
+ * 10 -> receiver compares
+ * XON1 and XOFF1
+ * 11 -> receiver compares
+ * XON1, XON2, XOFF1 and
+ * XOFF2
+ */
+
+/* Misc definitions */
+#define SC16IS7XX_FIFO_SIZE (64)
+#define SC16IS7XX_REG_SHIFT 2
+
+struct sc16is7xx_devtype {
+ char name[10];
+ int nr_gpio;
+ int nr_uart;
+};
+
+struct sc16is7xx_one {
+ struct uart_port port;
+ struct work_struct tx_work;
+ struct work_struct md_work;
+
+ struct serial_rs485 rs485;
+};
+
+struct sc16is7xx_port {
+ struct uart_driver uart;
+ struct sc16is7xx_devtype *devtype;
+ struct regmap *regmap;
+ struct mutex mutex;
+ struct clk *clk;
+#ifdef CONFIG_GPIOLIB
+ struct gpio_chip gpio;
+#endif
+ struct sc16is7xx_one p[0];
+};
+
+#define to_sc16is7xx_one(p,e) ((container_of((p), struct sc16is7xx_one, e)))
+
+static u8 sc16is7xx_port_read(struct uart_port *port, u8 reg)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ unsigned int val = 0;
+
+ regmap_read(s->regmap,
+ (reg << SC16IS7XX_REG_SHIFT) | port->line, &val);
+
+ return val;
+}
+
+static void sc16is7xx_port_write(struct uart_port *port, u8 reg, u8 val)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+ regmap_write(s->regmap,
+ (reg << SC16IS7XX_REG_SHIFT) | port->line, val);
+}
+
+static void sc16is7xx_port_update(struct uart_port *port, u8 reg,
+ u8 mask, u8 val)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+ regmap_update_bits(s->regmap,
+ (reg << SC16IS7XX_REG_SHIFT) | port->line,
+ mask, val);
+}
+
+
+static void sc16is7xx_power(struct uart_port *port, int on)
+{
+ sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+ SC16IS7XX_IER_SLEEP_BIT,
+ on ? 0 : SC16IS7XX_IER_SLEEP_BIT);
+}
+
+static const struct sc16is7xx_devtype sc16is74x_devtype = {
+ .name = "SC16IS74X",
+ .nr_gpio = 0,
+ .nr_uart = 1,
+};
+
+static const struct sc16is7xx_devtype sc16is750_devtype = {
+ .name = "SC16IS750",
+ .nr_gpio = 8,
+ .nr_uart = 1,
+};
+
+static const struct sc16is7xx_devtype sc16is752_devtype = {
+ .name = "SC16IS752",
+ .nr_gpio = 8,
+ .nr_uart = 2,
+};
+
+static const struct sc16is7xx_devtype sc16is760_devtype = {
+ .name = "SC16IS760",
+ .nr_gpio = 8,
+ .nr_uart = 1,
+};
+
+static const struct sc16is7xx_devtype sc16is762_devtype = {
+ .name = "SC16IS762",
+ .nr_gpio = 8,
+ .nr_uart = 2,
+};
+
+static bool sc16is7xx_regmap_volatile(struct device *dev, unsigned int reg)
+{
+ switch (reg >> SC16IS7XX_REG_SHIFT) {
+ case SC16IS7XX_RHR_REG:
+ case SC16IS7XX_IIR_REG:
+ case SC16IS7XX_LSR_REG:
+ case SC16IS7XX_MSR_REG:
+ case SC16IS7XX_TXLVL_REG:
+ case SC16IS7XX_RXLVL_REG:
+ case SC16IS7XX_IOSTATE_REG:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static bool sc16is7xx_regmap_precious(struct device *dev, unsigned int reg)
+{
+ switch (reg >> SC16IS7XX_REG_SHIFT) {
+ case SC16IS7XX_RHR_REG:
+ return true;
+ default:
+ break;
+ }
+
+ return false;
+}
+
+static int sc16is7xx_set_baud(struct uart_port *port, int baud)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ u8 lcr;
+ u8 prescaler = 0;
+ unsigned long clk = port->uartclk, div = clk / 16 / baud;
+
+ if (div > 0xffff) {
+ prescaler = SC16IS7XX_MCR_CLKSEL_BIT;
+ div /= 4;
+ }
+
+ lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG);
+
+ /* Open the LCR divisors for configuration */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_B);
+
+ /* Enable enhanced features */
+ regcache_cache_bypass(s->regmap, true);
+ sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
+ SC16IS7XX_EFR_ENABLE_BIT);
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Put LCR back to the normal mode */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+ sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+ SC16IS7XX_MCR_CLKSEL_BIT,
+ prescaler);
+
+ /* Open the LCR divisors for configuration */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_A);
+
+ /* Write the new divisor */
+ regcache_cache_bypass(s->regmap, true);
+ sc16is7xx_port_write(port, SC16IS7XX_DLH_REG, div / 256);
+ sc16is7xx_port_write(port, SC16IS7XX_DLL_REG, div % 256);
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Put LCR back to the normal mode */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+ return DIV_ROUND_CLOSEST(clk / 16, div);
+}
+
+static void sc16is7xx_handle_rx(struct uart_port *port, unsigned int rxlen,
+ unsigned int iir)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ unsigned int lsr = 0, ch, flag, bytes_read, i;
+ u8 buf[port->fifosize];
+ bool read_lsr = (iir == SC16IS7XX_IIR_RLSE_SRC) ? true : false;
+
+ if (unlikely(rxlen >= port->fifosize)) {
+ dev_warn_ratelimited(port->dev,
+ "Port %i: Possible RX FIFO overrun: %d\n",
+ port->line, rxlen);
+ port->icount.buf_overrun++;
+ /* Ensure sanity of RX level */
+ rxlen = port->fifosize;
+ }
+
+ while (rxlen) {
+ /* Only read lsr if there are possible errors in FIFO */
+ if (read_lsr) {
+ lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+ if (!(lsr & SC16IS7XX_LSR_FIFOE_BIT))
+ read_lsr = false; /* No errors left in FIFO */
+ } else
+ lsr = 0;
+
+ if (read_lsr) {
+ buf[0] = sc16is7xx_port_read(port, SC16IS7XX_RHR_REG);
+ bytes_read = 1;
+ } else {
+ regcache_cache_bypass(s->regmap, true);
+ regmap_raw_read(s->regmap, SC16IS7XX_RHR_REG,
+ buf, rxlen);
+ regcache_cache_bypass(s->regmap, false);
+ bytes_read = rxlen;
+ }
+
+ lsr &= SC16IS7XX_LSR_BRK_ERROR_MASK;
+
+ port->icount.rx++;
+ flag = TTY_NORMAL;
+
+ if (unlikely(lsr)) {
+ if (lsr & SC16IS7XX_LSR_BI_BIT) {
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ } else if (lsr & SC16IS7XX_LSR_PE_BIT)
+ port->icount.parity++;
+ else if (lsr & SC16IS7XX_LSR_FE_BIT)
+ port->icount.frame++;
+ else if (lsr & SC16IS7XX_LSR_OE_BIT)
+ port->icount.overrun++;
+
+ lsr &= port->read_status_mask;
+ if (lsr & SC16IS7XX_LSR_BI_BIT)
+ flag = TTY_BREAK;
+ else if (lsr & SC16IS7XX_LSR_PE_BIT)
+ flag = TTY_PARITY;
+ else if (lsr & SC16IS7XX_LSR_FE_BIT)
+ flag = TTY_FRAME;
+ else if (lsr & SC16IS7XX_LSR_OE_BIT)
+ flag = TTY_OVERRUN;
+ }
+
+ for (i = 0; i < bytes_read; ++i) {
+ ch = buf[i];
+ if (uart_handle_sysrq_char(port, ch))
+ continue;
+
+ if (lsr & port->ignore_status_mask)
+ continue;
+
+ uart_insert_char(port, lsr, SC16IS7XX_LSR_OE_BIT, ch,
+ flag);
+ }
+ rxlen -= bytes_read;
+ }
+
+ tty_flip_buffer_push(&port->state->port);
+}
+
+static void sc16is7xx_handle_tx(struct uart_port *port)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ struct circ_buf *xmit = &port->state->xmit;
+ unsigned int txlen, to_send, i;
+ u8 buf[port->fifosize];
+
+ if (unlikely(port->x_char)) {
+ sc16is7xx_port_write(port, SC16IS7XX_THR_REG, port->x_char);
+ port->icount.tx++;
+ port->x_char = 0;
+ return;
+ }
+
+ if (uart_circ_empty(xmit) || uart_tx_stopped(port))
+ return;
+
+ /* Get length of data pending in circular buffer */
+ to_send = uart_circ_chars_pending(xmit);
+ if (likely(to_send)) {
+ /* Limit to size of TX FIFO */
+ txlen = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+ to_send = (to_send > txlen) ? txlen : to_send;
+
+ /* Add data to send */
+ port->icount.tx += to_send;
+
+ /* Convert to linear buffer */
+ for (i = 0; i < to_send; ++i) {
+ buf[i] = xmit->buf[xmit->tail];
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ }
+ regcache_cache_bypass(s->regmap, true);
+ regmap_raw_write(s->regmap, SC16IS7XX_THR_REG, buf, to_send);
+ regcache_cache_bypass(s->regmap, false);
+ }
+
+ if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+ uart_write_wakeup(port);
+}
+
+static void sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
+{
+ struct uart_port *port = &s->p[portno].port;
+
+ do {
+ unsigned int iir, msr, rxlen;
+
+ iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
+ if (iir & SC16IS7XX_IIR_NO_INT_BIT)
+ break;
+
+ iir &= SC16IS7XX_IIR_ID_MASK;
+
+ switch (iir) {
+ case SC16IS7XX_IIR_RDI_SRC:
+ case SC16IS7XX_IIR_RLSE_SRC:
+ case SC16IS7XX_IIR_RTOI_SRC:
+ case SC16IS7XX_IIR_XOFFI_SRC:
+ rxlen = sc16is7xx_port_read(port, SC16IS7XX_RXLVL_REG);
+ if (rxlen)
+ sc16is7xx_handle_rx(port, rxlen, iir);
+ break;
+
+ case SC16IS7XX_IIR_CTSRTS_SRC:
+ msr = sc16is7xx_port_read(port, SC16IS7XX_MSR_REG);
+ uart_handle_cts_change(port,
+ !!(msr & SC16IS7XX_MSR_CTS_BIT));
+ break;
+ case SC16IS7XX_IIR_THRI_SRC:
+ mutex_lock(&s->mutex);
+ sc16is7xx_handle_tx(port);
+ mutex_unlock(&s->mutex);
+ break;
+ default:
+ dev_err_ratelimited(port->dev,
+ "Port %i: Unexpected interrupt: %x",
+ port->line, iir);
+ break;
+ }
+ } while (1);
+}
+
+static irqreturn_t sc16is7xx_ist(int irq, void *dev_id)
+{
+ struct sc16is7xx_port *s = (struct sc16is7xx_port *)dev_id;
+ int i;
+
+ for (i = 0; i < s->uart.nr; ++i)
+ sc16is7xx_port_irq(s, i);
+
+ return IRQ_HANDLED;
+}
+
+static void sc16is7xx_wq_proc(struct work_struct *ws)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(ws, tx_work);
+ struct sc16is7xx_port *s = dev_get_drvdata(one->port.dev);
+
+ mutex_lock(&s->mutex);
+ sc16is7xx_handle_tx(&one->port);
+ mutex_unlock(&s->mutex);
+}
+
+static void sc16is7xx_stop_tx(struct uart_port* port)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+ struct circ_buf *xmit = &one->port.state->xmit;
+
+ /* handle rs485 */
+ if (one->rs485.flags & SER_RS485_ENABLED) {
+ /* do nothing if current tx not yet completed */
+ int lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+ if (!(lsr & SC16IS7XX_LSR_TEMT_BIT))
+ return;
+
+ if (uart_circ_empty(xmit) &&
+ (one->rs485.delay_rts_after_send > 0))
+ mdelay(one->rs485.delay_rts_after_send);
+ }
+
+ sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+ SC16IS7XX_IER_THRI_BIT,
+ 0);
+}
+
+static void sc16is7xx_stop_rx(struct uart_port* port)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+ one->port.read_status_mask &= ~SC16IS7XX_LSR_DR_BIT;
+ sc16is7xx_port_update(port, SC16IS7XX_IER_REG,
+ SC16IS7XX_LSR_DR_BIT,
+ 0);
+}
+
+static void sc16is7xx_start_tx(struct uart_port *port)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+ /* handle rs485 */
+ if ((one->rs485.flags & SER_RS485_ENABLED) &&
+ (one->rs485.delay_rts_before_send > 0)) {
+ mdelay(one->rs485.delay_rts_before_send);
+ }
+
+ if (!work_pending(&one->tx_work))
+ schedule_work(&one->tx_work);
+}
+
+static unsigned int sc16is7xx_tx_empty(struct uart_port *port)
+{
+ unsigned int lvl, lsr;
+
+ lvl = sc16is7xx_port_read(port, SC16IS7XX_TXLVL_REG);
+ lsr = sc16is7xx_port_read(port, SC16IS7XX_LSR_REG);
+
+ return ((lsr & SC16IS7XX_LSR_THRE_BIT) && !lvl) ? TIOCSER_TEMT : 0;
+}
+
+static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
+{
+ /* DCD and DSR are not wired and CTS/RTS is handled automatically
+ * so just indicate DSR and CAR asserted
+ */
+ return TIOCM_DSR | TIOCM_CAR;
+}
+
+static void sc16is7xx_md_proc(struct work_struct *ws)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(ws, md_work);
+
+ sc16is7xx_port_update(&one->port, SC16IS7XX_MCR_REG,
+ SC16IS7XX_MCR_LOOP_BIT,
+ (one->port.mctrl & TIOCM_LOOP) ?
+ SC16IS7XX_MCR_LOOP_BIT : 0);
+}
+
+static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+ schedule_work(&one->md_work);
+}
+
+static void sc16is7xx_break_ctl(struct uart_port *port, int break_state)
+{
+ sc16is7xx_port_update(port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_TXBREAK_BIT,
+ break_state ? SC16IS7XX_LCR_TXBREAK_BIT : 0);
+}
+
+static void sc16is7xx_set_termios(struct uart_port *port,
+ struct ktermios *termios,
+ struct ktermios *old)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ unsigned int lcr, flow = 0;
+ int baud;
+
+ /* Mask termios capabilities we don't support */
+ termios->c_cflag &= ~CMSPAR;
+
+ /* Word size */
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ lcr = SC16IS7XX_LCR_WORD_LEN_5;
+ break;
+ case CS6:
+ lcr = SC16IS7XX_LCR_WORD_LEN_6;
+ break;
+ case CS7:
+ lcr = SC16IS7XX_LCR_WORD_LEN_7;
+ break;
+ case CS8:
+ lcr = SC16IS7XX_LCR_WORD_LEN_8;
+ break;
+ default:
+ lcr = SC16IS7XX_LCR_WORD_LEN_8;
+ termios->c_cflag &= ~CSIZE;
+ termios->c_cflag |= CS8;
+ break;
+ }
+
+ /* Parity */
+ if (termios->c_cflag & PARENB) {
+ lcr |= SC16IS7XX_LCR_PARITY_BIT;
+ if (!(termios->c_cflag & PARODD))
+ lcr |= SC16IS7XX_LCR_EVENPARITY_BIT;
+ }
+
+ /* Stop bits */
+ if (termios->c_cflag & CSTOPB)
+ lcr |= SC16IS7XX_LCR_STOPLEN_BIT; /* 2 stops */
+
+ /* Set read status mask */
+ port->read_status_mask = SC16IS7XX_LSR_OE_BIT;
+ if (termios->c_iflag & INPCK)
+ port->read_status_mask |= SC16IS7XX_LSR_PE_BIT |
+ SC16IS7XX_LSR_FE_BIT;
+ if (termios->c_iflag & (BRKINT | PARMRK))
+ port->read_status_mask |= SC16IS7XX_LSR_BI_BIT;
+
+ /* Set status ignore mask */
+ port->ignore_status_mask = 0;
+ if (termios->c_iflag & IGNBRK)
+ port->ignore_status_mask |= SC16IS7XX_LSR_BI_BIT;
+ if (!(termios->c_cflag & CREAD))
+ port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK;
+
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_B);
+
+ /* Configure flow control */
+ regcache_cache_bypass(s->regmap, true);
+ sc16is7xx_port_write(port, SC16IS7XX_XON1_REG, termios->c_cc[VSTART]);
+ sc16is7xx_port_write(port, SC16IS7XX_XOFF1_REG, termios->c_cc[VSTOP]);
+ if (termios->c_cflag & CRTSCTS)
+ flow |= SC16IS7XX_EFR_AUTOCTS_BIT |
+ SC16IS7XX_EFR_AUTORTS_BIT;
+ if (termios->c_iflag & IXON)
+ flow |= SC16IS7XX_EFR_SWFLOW3_BIT;
+ if (termios->c_iflag & IXOFF)
+ flow |= SC16IS7XX_EFR_SWFLOW1_BIT;
+
+ sc16is7xx_port_write(port, SC16IS7XX_EFR_REG, flow);
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Update LCR register */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
+
+ /* Get baud rate generator configuration */
+ baud = uart_get_baud_rate(port, termios, old,
+ port->uartclk / 16 / 4 / 0xffff,
+ port->uartclk / 16);
+
+ /* Setup baudrate generator */
+ baud = sc16is7xx_set_baud(port, baud);
+
+ /* Update timeout according to new baud rate */
+ uart_update_timeout(port, termios->c_cflag, baud);
+}
+
+#if defined(TIOCSRS485) && defined(TIOCGRS485)
+static void sc16is7xx_config_rs485(struct uart_port *port,
+ struct serial_rs485 *rs485)
+{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
+
+ one->rs485 = *rs485;
+
+ if (one->rs485.flags & SER_RS485_ENABLED) {
+ sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_AUTO_RS485_BIT,
+ SC16IS7XX_EFCR_AUTO_RS485_BIT);
+ } else {
+ sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_AUTO_RS485_BIT,
+ 0);
+ }
+}
+#endif
+
+static int sc16is7xx_ioctl(struct uart_port *port, unsigned int cmd,
+ unsigned long arg)
+{
+#if defined(TIOCSRS485) && defined(TIOCGRS485)
+ struct serial_rs485 rs485;
+
+ switch (cmd) {
+ case TIOCSRS485:
+ if (copy_from_user(&rs485, (void __user *)arg, sizeof(rs485)))
+ return -EFAULT;
+
+ sc16is7xx_config_rs485(port, &rs485);
+ return 0;
+ case TIOCGRS485:
+ if (copy_to_user((void __user *)arg,
+ &(to_sc16is7xx_one(port, port)->rs485),
+ sizeof(rs485)))
+ return -EFAULT;
+ return 0;
+ default:
+ break;
+ }
+#endif
+
+ return -ENOIOCTLCMD;
+}
+
+static int sc16is7xx_startup(struct uart_port *port)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+ unsigned int val;
+
+ sc16is7xx_power(port, 1);
+
+ /* Reset FIFOs*/
+ val = SC16IS7XX_FCR_RXRESET_BIT | SC16IS7XX_FCR_TXRESET_BIT;
+ sc16is7xx_port_write(port, SC16IS7XX_FCR_REG, val);
+ udelay(5);
+ sc16is7xx_port_write(port, SC16IS7XX_FCR_REG,
+ SC16IS7XX_FCR_FIFO_BIT);
+
+ /* Enable EFR */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
+ SC16IS7XX_LCR_CONF_MODE_B);
+
+ regcache_cache_bypass(s->regmap, true);
+
+ /* Enable write access to enhanced features and internal clock div */
+ sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
+ SC16IS7XX_EFR_ENABLE_BIT);
+
+ /* Enable TCR/TLR */
+ sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+ SC16IS7XX_MCR_TCRTLR_BIT,
+ SC16IS7XX_MCR_TCRTLR_BIT);
+
+ /* Configure flow control levels */
+ /* Flow control halt level 48, resume level 24 */
+ sc16is7xx_port_write(port, SC16IS7XX_TCR_REG,
+ SC16IS7XX_TCR_RX_RESUME(24) |
+ SC16IS7XX_TCR_RX_HALT(48));
+
+ regcache_cache_bypass(s->regmap, false);
+
+ /* Now, initialize the UART */
+ sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_WORD_LEN_8);
+
+ /* Enable the Rx and Tx FIFO */
+ sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_RXDISABLE_BIT |
+ SC16IS7XX_EFCR_TXDISABLE_BIT,
+ 0);
+
+ /* Enable RX, TX, CTS change interrupts */
+ val = SC16IS7XX_IER_RDI_BIT | SC16IS7XX_IER_THRI_BIT |
+ SC16IS7XX_IER_CTSI_BIT;
+ sc16is7xx_port_write(port, SC16IS7XX_IER_REG, val);
+
+ return 0;
+}
+
+static void sc16is7xx_shutdown(struct uart_port *port)
+{
+ /* Disable all interrupts */
+ sc16is7xx_port_write(port, SC16IS7XX_IER_REG, 0);
+ /* Disable TX/RX */
+ sc16is7xx_port_write(port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_RXDISABLE_BIT |
+ SC16IS7XX_EFCR_TXDISABLE_BIT);
+
+ sc16is7xx_power(port, 0);
+}
+
+static const char *sc16is7xx_type(struct uart_port *port)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
+
+ return (port->type == PORT_SC16IS7XX) ? s->devtype->name : NULL;
+}
+
+static int sc16is7xx_request_port(struct uart_port *port)
+{
+ /* Do nothing */
+ return 0;
+}
+
+static void sc16is7xx_config_port(struct uart_port *port, int flags)
+{
+ if (flags & UART_CONFIG_TYPE)
+ port->type = PORT_SC16IS7XX;
+}
+
+static int sc16is7xx_verify_port(struct uart_port *port,
+ struct serial_struct *s)
+{
+ if ((s->type != PORT_UNKNOWN) && (s->type != PORT_SC16IS7XX))
+ return -EINVAL;
+ if (s->irq != port->irq)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void sc16is7xx_pm(struct uart_port *port, unsigned int state,
+ unsigned int oldstate)
+{
+ sc16is7xx_power(port, (state == UART_PM_STATE_ON) ? 1 : 0);
+}
+
+static void sc16is7xx_null_void(struct uart_port *port)
+{
+ /* Do nothing */
+}
+
+static const struct uart_ops sc16is7xx_ops = {
+ .tx_empty = sc16is7xx_tx_empty,
+ .set_mctrl = sc16is7xx_set_mctrl,
+ .get_mctrl = sc16is7xx_get_mctrl,
+ .stop_tx = sc16is7xx_stop_tx,
+ .start_tx = sc16is7xx_start_tx,
+ .stop_rx = sc16is7xx_stop_rx,
+ .enable_ms = sc16is7xx_null_void,
+ .break_ctl = sc16is7xx_break_ctl,
+ .startup = sc16is7xx_startup,
+ .shutdown = sc16is7xx_shutdown,
+ .set_termios = sc16is7xx_set_termios,
+ .type = sc16is7xx_type,
+ .request_port = sc16is7xx_request_port,
+ .release_port = sc16is7xx_null_void,
+ .config_port = sc16is7xx_config_port,
+ .verify_port = sc16is7xx_verify_port,
+ .ioctl = sc16is7xx_ioctl,
+ .pm = sc16is7xx_pm,
+};
+
+#ifdef CONFIG_GPIOLIB
+static int sc16is7xx_gpio_get(struct gpio_chip *chip, unsigned offset)
+{
+ unsigned int val;
+ struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+ gpio);
+ struct uart_port *port = &s->p[0].port;
+
+ val = sc16is7xx_port_read(port, SC16IS7XX_IOSTATE_REG);
+
+ return !!(val & BIT(offset));
+}
+
+static void sc16is7xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
+{
+ struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+ gpio);
+ struct uart_port *port = &s->p[0].port;
+
+ sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
+ val ? BIT(offset) : 0);
+}
+
+static int sc16is7xx_gpio_direction_input(struct gpio_chip *chip,
+ unsigned offset)
+{
+ struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+ gpio);
+ struct uart_port *port = &s->p[0].port;
+
+ sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset), 0);
+
+ return 0;
+}
+
+static int sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
+ unsigned offset, int val)
+{
+ struct sc16is7xx_port *s = container_of(chip, struct sc16is7xx_port,
+ gpio);
+ struct uart_port *port = &s->p[0].port;
+
+ sc16is7xx_port_update(port, SC16IS7XX_IOSTATE_REG, BIT(offset),
+ val ? BIT(offset) : 0);
+ sc16is7xx_port_update(port, SC16IS7XX_IODIR_REG, BIT(offset),
+ BIT(offset));
+
+ return 0;
+}
+#endif
+
+static int sc16is7xx_probe(struct device *dev,
+ struct sc16is7xx_devtype *devtype,
+ struct regmap *regmap, int irq, unsigned long flags)
+{
+ unsigned long freq, *pfreq = dev_get_platdata(dev);
+ struct clk *clk;
+ int i, ret;
+ struct sc16is7xx_port *s;
+
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ /* Alloc port structure */
+ s = devm_kzalloc(dev, sizeof(*s) +
+ sizeof(struct sc16is7xx_one) * devtype->nr_uart,
+ GFP_KERNEL);
+ if (!s) {
+ dev_err(dev, "Error allocating port structure\n");
+ return -ENOMEM;
+ }
+
+ clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(clk)) {
+ if (pfreq)
+ freq = *pfreq;
+ else
+ return PTR_ERR(clk);
+ } else {
+ freq = clk_get_rate(clk);
+ }
+
+ s->regmap = regmap;
+ s->devtype = devtype;
+ dev_set_drvdata(dev, s);
+
+ /* Register UART driver */
+ s->uart.owner = THIS_MODULE;
+ s->uart.dev_name = "ttySC";
+ s->uart.nr = devtype->nr_uart;
+ ret = uart_register_driver(&s->uart);
+ if (ret) {
+ dev_err(dev, "Registering UART driver failed\n");
+ goto out_clk;
+ }
+
+#ifdef CONFIG_GPIOLIB
+ if (devtype->nr_gpio) {
+ /* Setup GPIO cotroller */
+ s->gpio.owner = THIS_MODULE;
+ s->gpio.dev = dev;
+ s->gpio.label = dev_name(dev);
+ s->gpio.direction_input = sc16is7xx_gpio_direction_input;
+ s->gpio.get = sc16is7xx_gpio_get;
+ s->gpio.direction_output = sc16is7xx_gpio_direction_output;
+ s->gpio.set = sc16is7xx_gpio_set;
+ s->gpio.base = -1;
+ s->gpio.ngpio = devtype->nr_gpio;
+ s->gpio.can_sleep = 1;
+ ret = gpiochip_add(&s->gpio);
+ if (ret)
+ goto out_uart;
+ }
+#endif
+
+ mutex_init(&s->mutex);
+
+ for (i = 0; i < devtype->nr_uart; ++i) {
+ /* Initialize port data */
+ s->p[i].port.line = i;
+ s->p[i].port.dev = dev;
+ s->p[i].port.irq = irq;
+ s->p[i].port.type = PORT_SC16IS7XX;
+ s->p[i].port.fifosize = SC16IS7XX_FIFO_SIZE;
+ s->p[i].port.flags = UPF_FIXED_TYPE | UPF_LOW_LATENCY;
+ s->p[i].port.iotype = UPIO_PORT;
+ s->p[i].port.uartclk = freq;
+ s->p[i].port.ops = &sc16is7xx_ops;
+ /* Disable all interrupts */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_IER_REG, 0);
+ /* Disable TX/RX */
+ sc16is7xx_port_write(&s->p[i].port, SC16IS7XX_EFCR_REG,
+ SC16IS7XX_EFCR_RXDISABLE_BIT |
+ SC16IS7XX_EFCR_TXDISABLE_BIT);
+ /* Initialize queue for start TX */
+ INIT_WORK(&s->p[i].tx_work, sc16is7xx_wq_proc);
+ /* Initialize queue for changing mode */
+ INIT_WORK(&s->p[i].md_work, sc16is7xx_md_proc);
+ /* Register port */
+ uart_add_one_port(&s->uart, &s->p[i].port);
+ /* Go to suspend mode */
+ sc16is7xx_power(&s->p[i].port, 0);
+ }
+
+ /* Setup interrupt */
+ ret = devm_request_threaded_irq(dev, irq, NULL, sc16is7xx_ist,
+ IRQF_ONESHOT | flags, dev_name(dev), s);
+ if (!ret)
+ return 0;
+
+ mutex_destroy(&s->mutex);
+
+#ifdef CONFIG_GPIOLIB
+ if (devtype->nr_gpio)
+ WARN_ON(gpiochip_remove(&s->gpio));
+
+out_uart:
+#endif
+ uart_unregister_driver(&s->uart);
+
+out_clk:
+ if (!IS_ERR(s->clk))
+ clk_disable_unprepare(s->clk);
+
+ return ret;
+}
+
+static int sc16is7xx_remove(struct device *dev)
+{
+ struct sc16is7xx_port *s = dev_get_drvdata(dev);
+ int i, ret = 0;
+
+#ifdef CONFIG_GPIOLIB
+ if (s->devtype->nr_gpio) {
+ ret = gpiochip_remove(&s->gpio);
+ if (ret)
+ return ret;
+ }
+#endif
+
+ for (i = 0; i < s->uart.nr; i++) {
+ cancel_work_sync(&s->p[i].tx_work);
+ cancel_work_sync(&s->p[i].md_work);
+ uart_remove_one_port(&s->uart, &s->p[i].port);
+ sc16is7xx_power(&s->p[i].port, 0);
+ }
+
+ mutex_destroy(&s->mutex);
+ uart_unregister_driver(&s->uart);
+ if (!IS_ERR(s->clk))
+ clk_disable_unprepare(s->clk);
+
+ return ret;
+}
+
+static const struct of_device_id __maybe_unused sc16is7xx_dt_ids[] = {
+ { .compatible = "nxp,sc16is740", .data = &sc16is74x_devtype, },
+ { .compatible = "nxp,sc16is741", .data = &sc16is74x_devtype, },
+ { .compatible = "nxp,sc16is750", .data = &sc16is750_devtype, },
+ { .compatible = "nxp,sc16is752", .data = &sc16is752_devtype, },
+ { .compatible = "nxp,sc16is760", .data = &sc16is760_devtype, },
+ { .compatible = "nxp,sc16is762", .data = &sc16is762_devtype, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sc16is7xx_dt_ids);
+
+static struct regmap_config regcfg = {
+ .reg_bits = 7,
+ .pad_bits = 1,
+ .val_bits = 8,
+ .cache_type = REGCACHE_RBTREE,
+ .volatile_reg = sc16is7xx_regmap_volatile,
+ .precious_reg = sc16is7xx_regmap_precious,
+};
+
+#ifdef CONFIG_REGMAP_I2C
+static int sc16is7xx_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct sc16is7xx_devtype *devtype;
+ unsigned long flags = 0;
+ struct regmap *regmap;
+
+ if (i2c->dev.of_node) {
+ const struct of_device_id *of_id =
+ of_match_device(sc16is7xx_dt_ids, &i2c->dev);
+
+ devtype = (struct sc16is7xx_devtype *)of_id->data;
+ } else {
+ devtype = (struct sc16is7xx_devtype *)id->driver_data;
+ flags = IRQF_TRIGGER_FALLING;
+ }
+
+ regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
+ (devtype->nr_uart - 1);
+ regmap = devm_regmap_init_i2c(i2c, ®cfg);
+
+ return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq, flags);
+}
+
+static int sc16is7xx_i2c_remove(struct i2c_client *client)
+{
+ return sc16is7xx_remove(&client->dev);
+}
+
+static const struct i2c_device_id sc16is7xx_i2c_id_table[] = {
+ { "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
+ { "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
+ { "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
+ { "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
+ { "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sc16is7xx_i2c_id_table);
+
+static struct i2c_driver sc16is7xx_i2c_uart_driver = {
+ .driver = {
+ .name = SC16IS7XX_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(sc16is7xx_dt_ids),
+ },
+ .probe = sc16is7xx_i2c_probe,
+ .remove = sc16is7xx_i2c_remove,
+ .id_table = sc16is7xx_i2c_id_table,
+};
+module_i2c_driver(sc16is7xx_i2c_uart_driver);
+MODULE_ALIAS("i2c:sc16is7xx");
+#endif
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jon Ringle <jringle@gridpoint.com>");
+MODULE_DESCRIPTION("SC16IS7XX serial driver");
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b68550d..9a01ee4 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -2239,6 +2239,9 @@
return;
port = state->uart_port;
+
+ if (ch == '\n')
+ port->ops->poll_put_char(port, '\r');
port->ops->poll_put_char(port, ch);
}
#endif
diff --git a/drivers/tty/serial/serial_txx9.c b/drivers/tty/serial/serial_txx9.c
index 90a080b..60f49b9 100644
--- a/drivers/tty/serial/serial_txx9.c
+++ b/drivers/tty/serial/serial_txx9.c
@@ -535,13 +535,8 @@
wait_for_xmitr(up);
/*
* Send the character out.
- * If a LF, also do CR...
*/
sio_out(up, TXX9_SITFIFO, c);
- if (c == 10) {
- wait_for_xmitr(up);
- sio_out(up, TXX9_SITFIFO, 13);
- }
/*
* Finally, wait for transmitter to become empty
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index f619ad5..8809775 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -1,7 +1,7 @@
/*
- * Xilinx PS UART driver
+ * Cadence UART driver (found in Xilinx Zynq)
*
- * 2011 - 2013 (C) Xilinx Inc.
+ * 2011 - 2014 (C) Xilinx Inc.
*
* This program is free software; you can redistribute it
* and/or modify it under the terms of the GNU General Public
@@ -9,6 +9,9 @@
* either version 2 of the License, or (at your option) any
* later version.
*
+ * This driver has originally been pushed by Xilinx using a Zynq-branding. This
+ * still shows in the naming of this file, the kconfig symbols and some symbols
+ * in the code.
*/
#if defined(CONFIG_SERIAL_XILINX_PS_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
@@ -28,16 +31,16 @@
#include <linux/of.h>
#include <linux/module.h>
-#define XUARTPS_TTY_NAME "ttyPS"
-#define XUARTPS_NAME "xuartps"
-#define XUARTPS_MAJOR 0 /* use dynamic node allocation */
-#define XUARTPS_MINOR 0 /* works best with devtmpfs */
-#define XUARTPS_NR_PORTS 2
-#define XUARTPS_FIFO_SIZE 64 /* FIFO size */
-#define XUARTPS_REGISTER_SPACE 0xFFF
+#define CDNS_UART_TTY_NAME "ttyPS"
+#define CDNS_UART_NAME "xuartps"
+#define CDNS_UART_MAJOR 0 /* use dynamic node allocation */
+#define CDNS_UART_MINOR 0 /* works best with devtmpfs */
+#define CDNS_UART_NR_PORTS 2
+#define CDNS_UART_FIFO_SIZE 64 /* FIFO size */
+#define CDNS_UART_REGISTER_SPACE 0xFFF
-#define xuartps_readl(offset) ioread32(port->membase + offset)
-#define xuartps_writel(val, offset) iowrite32(val, port->membase + offset)
+#define cdns_uart_readl(offset) ioread32(port->membase + offset)
+#define cdns_uart_writel(val, offset) iowrite32(val, port->membase + offset)
/* Rx Trigger level */
static int rx_trigger_level = 56;
@@ -49,77 +52,62 @@
module_param(rx_timeout, uint, S_IRUGO);
MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
-/********************************Register Map********************************/
-/** UART
- *
- * Register offsets for the UART.
- *
- */
-#define XUARTPS_CR_OFFSET 0x00 /* Control Register [8:0] */
-#define XUARTPS_MR_OFFSET 0x04 /* Mode Register [10:0] */
-#define XUARTPS_IER_OFFSET 0x08 /* Interrupt Enable [10:0] */
-#define XUARTPS_IDR_OFFSET 0x0C /* Interrupt Disable [10:0] */
-#define XUARTPS_IMR_OFFSET 0x10 /* Interrupt Mask [10:0] */
-#define XUARTPS_ISR_OFFSET 0x14 /* Interrupt Status [10:0]*/
-#define XUARTPS_BAUDGEN_OFFSET 0x18 /* Baud Rate Generator [15:0] */
-#define XUARTPS_RXTOUT_OFFSET 0x1C /* RX Timeout [7:0] */
-#define XUARTPS_RXWM_OFFSET 0x20 /* RX FIFO Trigger Level [5:0] */
-#define XUARTPS_MODEMCR_OFFSET 0x24 /* Modem Control [5:0] */
-#define XUARTPS_MODEMSR_OFFSET 0x28 /* Modem Status [8:0] */
-#define XUARTPS_SR_OFFSET 0x2C /* Channel Status [11:0] */
-#define XUARTPS_FIFO_OFFSET 0x30 /* FIFO [15:0] or [7:0] */
-#define XUARTPS_BAUDDIV_OFFSET 0x34 /* Baud Rate Divider [7:0] */
-#define XUARTPS_FLOWDEL_OFFSET 0x38 /* Flow Delay [15:0] */
-#define XUARTPS_IRRX_PWIDTH_OFFSET 0x3C /* IR Minimum Received Pulse
- Width [15:0] */
-#define XUARTPS_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse
- Width [7:0] */
-#define XUARTPS_TXWM_OFFSET 0x44 /* TX FIFO Trigger Level [5:0] */
+/* Register offsets for the UART. */
+#define CDNS_UART_CR_OFFSET 0x00 /* Control Register */
+#define CDNS_UART_MR_OFFSET 0x04 /* Mode Register */
+#define CDNS_UART_IER_OFFSET 0x08 /* Interrupt Enable */
+#define CDNS_UART_IDR_OFFSET 0x0C /* Interrupt Disable */
+#define CDNS_UART_IMR_OFFSET 0x10 /* Interrupt Mask */
+#define CDNS_UART_ISR_OFFSET 0x14 /* Interrupt Status */
+#define CDNS_UART_BAUDGEN_OFFSET 0x18 /* Baud Rate Generator */
+#define CDNS_UART_RXTOUT_OFFSET 0x1C /* RX Timeout */
+#define CDNS_UART_RXWM_OFFSET 0x20 /* RX FIFO Trigger Level */
+#define CDNS_UART_MODEMCR_OFFSET 0x24 /* Modem Control */
+#define CDNS_UART_MODEMSR_OFFSET 0x28 /* Modem Status */
+#define CDNS_UART_SR_OFFSET 0x2C /* Channel Status */
+#define CDNS_UART_FIFO_OFFSET 0x30 /* FIFO */
+#define CDNS_UART_BAUDDIV_OFFSET 0x34 /* Baud Rate Divider */
+#define CDNS_UART_FLOWDEL_OFFSET 0x38 /* Flow Delay */
+#define CDNS_UART_IRRX_PWIDTH_OFFSET 0x3C /* IR Min Received Pulse Width */
+#define CDNS_UART_IRTX_PWIDTH_OFFSET 0x40 /* IR Transmitted pulse Width */
+#define CDNS_UART_TXWM_OFFSET 0x44 /* TX FIFO Trigger Level */
-/** Control Register
- *
- * The Control register (CR) controls the major functions of the device.
- *
- * Control Register Bit Definitions
- */
-#define XUARTPS_CR_STOPBRK 0x00000100 /* Stop TX break */
-#define XUARTPS_CR_STARTBRK 0x00000080 /* Set TX break */
-#define XUARTPS_CR_TX_DIS 0x00000020 /* TX disabled. */
-#define XUARTPS_CR_TX_EN 0x00000010 /* TX enabled */
-#define XUARTPS_CR_RX_DIS 0x00000008 /* RX disabled. */
-#define XUARTPS_CR_RX_EN 0x00000004 /* RX enabled */
-#define XUARTPS_CR_TXRST 0x00000002 /* TX logic reset */
-#define XUARTPS_CR_RXRST 0x00000001 /* RX logic reset */
-#define XUARTPS_CR_RST_TO 0x00000040 /* Restart Timeout Counter */
+/* Control Register Bit Definitions */
+#define CDNS_UART_CR_STOPBRK 0x00000100 /* Stop TX break */
+#define CDNS_UART_CR_STARTBRK 0x00000080 /* Set TX break */
+#define CDNS_UART_CR_TX_DIS 0x00000020 /* TX disabled. */
+#define CDNS_UART_CR_TX_EN 0x00000010 /* TX enabled */
+#define CDNS_UART_CR_RX_DIS 0x00000008 /* RX disabled. */
+#define CDNS_UART_CR_RX_EN 0x00000004 /* RX enabled */
+#define CDNS_UART_CR_TXRST 0x00000002 /* TX logic reset */
+#define CDNS_UART_CR_RXRST 0x00000001 /* RX logic reset */
+#define CDNS_UART_CR_RST_TO 0x00000040 /* Restart Timeout Counter */
-/** Mode Register
- *
+/*
+ * Mode Register:
* The mode register (MR) defines the mode of transfer as well as the data
* format. If this register is modified during transmission or reception,
* data validity cannot be guaranteed.
- *
- * Mode Register Bit Definitions
- *
*/
-#define XUARTPS_MR_CLKSEL 0x00000001 /* Pre-scalar selection */
-#define XUARTPS_MR_CHMODE_L_LOOP 0x00000200 /* Local loop back mode */
-#define XUARTPS_MR_CHMODE_NORM 0x00000000 /* Normal mode */
+#define CDNS_UART_MR_CLKSEL 0x00000001 /* Pre-scalar selection */
+#define CDNS_UART_MR_CHMODE_L_LOOP 0x00000200 /* Local loop back mode */
+#define CDNS_UART_MR_CHMODE_NORM 0x00000000 /* Normal mode */
-#define XUARTPS_MR_STOPMODE_2_BIT 0x00000080 /* 2 stop bits */
-#define XUARTPS_MR_STOPMODE_1_BIT 0x00000000 /* 1 stop bit */
+#define CDNS_UART_MR_STOPMODE_2_BIT 0x00000080 /* 2 stop bits */
+#define CDNS_UART_MR_STOPMODE_1_BIT 0x00000000 /* 1 stop bit */
-#define XUARTPS_MR_PARITY_NONE 0x00000020 /* No parity mode */
-#define XUARTPS_MR_PARITY_MARK 0x00000018 /* Mark parity mode */
-#define XUARTPS_MR_PARITY_SPACE 0x00000010 /* Space parity mode */
-#define XUARTPS_MR_PARITY_ODD 0x00000008 /* Odd parity mode */
-#define XUARTPS_MR_PARITY_EVEN 0x00000000 /* Even parity mode */
+#define CDNS_UART_MR_PARITY_NONE 0x00000020 /* No parity mode */
+#define CDNS_UART_MR_PARITY_MARK 0x00000018 /* Mark parity mode */
+#define CDNS_UART_MR_PARITY_SPACE 0x00000010 /* Space parity mode */
+#define CDNS_UART_MR_PARITY_ODD 0x00000008 /* Odd parity mode */
+#define CDNS_UART_MR_PARITY_EVEN 0x00000000 /* Even parity mode */
-#define XUARTPS_MR_CHARLEN_6_BIT 0x00000006 /* 6 bits data */
-#define XUARTPS_MR_CHARLEN_7_BIT 0x00000004 /* 7 bits data */
-#define XUARTPS_MR_CHARLEN_8_BIT 0x00000000 /* 8 bits data */
+#define CDNS_UART_MR_CHARLEN_6_BIT 0x00000006 /* 6 bits data */
+#define CDNS_UART_MR_CHARLEN_7_BIT 0x00000004 /* 7 bits data */
+#define CDNS_UART_MR_CHARLEN_8_BIT 0x00000000 /* 8 bits data */
-/** Interrupt Registers
- *
+/*
+ * Interrupt Registers:
* Interrupt control logic uses the interrupt enable register (IER) and the
* interrupt disable register (IDR) to set the value of the bits in the
* interrupt mask register (IMR). The IMR determines whether to pass an
@@ -127,65 +115,65 @@
* Writing a 1 to IER Enables an interrupt, writing a 1 to IDR disables an
* interrupt. IMR and ISR are read only, and IER and IDR are write only.
* Reading either IER or IDR returns 0x00.
- *
* All four registers have the same bit definitions.
*/
-#define XUARTPS_IXR_TOUT 0x00000100 /* RX Timeout error interrupt */
-#define XUARTPS_IXR_PARITY 0x00000080 /* Parity error interrupt */
-#define XUARTPS_IXR_FRAMING 0x00000040 /* Framing error interrupt */
-#define XUARTPS_IXR_OVERRUN 0x00000020 /* Overrun error interrupt */
-#define XUARTPS_IXR_TXFULL 0x00000010 /* TX FIFO Full interrupt */
-#define XUARTPS_IXR_TXEMPTY 0x00000008 /* TX FIFO empty interrupt */
-#define XUARTPS_ISR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt */
-#define XUARTPS_IXR_RXTRIG 0x00000001 /* RX FIFO trigger interrupt */
-#define XUARTPS_IXR_RXFULL 0x00000004 /* RX FIFO full interrupt. */
-#define XUARTPS_IXR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt. */
-#define XUARTPS_IXR_MASK 0x00001FFF /* Valid bit mask */
+#define CDNS_UART_IXR_TOUT 0x00000100 /* RX Timeout error interrupt */
+#define CDNS_UART_IXR_PARITY 0x00000080 /* Parity error interrupt */
+#define CDNS_UART_IXR_FRAMING 0x00000040 /* Framing error interrupt */
+#define CDNS_UART_IXR_OVERRUN 0x00000020 /* Overrun error interrupt */
+#define CDNS_UART_IXR_TXFULL 0x00000010 /* TX FIFO Full interrupt */
+#define CDNS_UART_IXR_TXEMPTY 0x00000008 /* TX FIFO empty interrupt */
+#define CDNS_UART_ISR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt */
+#define CDNS_UART_IXR_RXTRIG 0x00000001 /* RX FIFO trigger interrupt */
+#define CDNS_UART_IXR_RXFULL 0x00000004 /* RX FIFO full interrupt. */
+#define CDNS_UART_IXR_RXEMPTY 0x00000002 /* RX FIFO empty interrupt. */
+#define CDNS_UART_IXR_MASK 0x00001FFF /* Valid bit mask */
/* Goes in read_status_mask for break detection as the HW doesn't do it*/
-#define XUARTPS_IXR_BRK 0x80000000
+#define CDNS_UART_IXR_BRK 0x80000000
-/** Channel Status Register
- *
+/*
+ * Channel Status Register:
* The channel status register (CSR) is provided to enable the control logic
* to monitor the status of bits in the channel interrupt status register,
* even if these are masked out by the interrupt mask register.
*/
-#define XUARTPS_SR_RXEMPTY 0x00000002 /* RX FIFO empty */
-#define XUARTPS_SR_TXEMPTY 0x00000008 /* TX FIFO empty */
-#define XUARTPS_SR_TXFULL 0x00000010 /* TX FIFO full */
-#define XUARTPS_SR_RXTRIG 0x00000001 /* Rx Trigger */
+#define CDNS_UART_SR_RXEMPTY 0x00000002 /* RX FIFO empty */
+#define CDNS_UART_SR_TXEMPTY 0x00000008 /* TX FIFO empty */
+#define CDNS_UART_SR_TXFULL 0x00000010 /* TX FIFO full */
+#define CDNS_UART_SR_RXTRIG 0x00000001 /* Rx Trigger */
/* baud dividers min/max values */
-#define XUARTPS_BDIV_MIN 4
-#define XUARTPS_BDIV_MAX 255
-#define XUARTPS_CD_MAX 65535
+#define CDNS_UART_BDIV_MIN 4
+#define CDNS_UART_BDIV_MAX 255
+#define CDNS_UART_CD_MAX 65535
/**
- * struct xuartps - device data
- * @port Pointer to the UART port
- * @refclk Reference clock
- * @aperclk APB clock
- * @baud Current baud rate
- * @clk_rate_change_nb Notifier block for clock changes
+ * struct cdns_uart - device data
+ * @port: Pointer to the UART port
+ * @uartclk: Reference clock
+ * @pclk: APB clock
+ * @baud: Current baud rate
+ * @clk_rate_change_nb: Notifier block for clock changes
*/
-struct xuartps {
+struct cdns_uart {
struct uart_port *port;
- struct clk *refclk;
- struct clk *aperclk;
+ struct clk *uartclk;
+ struct clk *pclk;
unsigned int baud;
struct notifier_block clk_rate_change_nb;
};
-#define to_xuartps(_nb) container_of(_nb, struct xuartps, clk_rate_change_nb);
+#define to_cdns_uart(_nb) container_of(_nb, struct cdns_uart, \
+ clk_rate_change_nb);
/**
- * xuartps_isr - Interrupt handler
+ * cdns_uart_isr - Interrupt handler
* @irq: Irq number
* @dev_id: Id of the port
*
- * Returns IRQHANDLED
- **/
-static irqreturn_t xuartps_isr(int irq, void *dev_id)
+ * Return: IRQHANDLED
+ */
+static irqreturn_t cdns_uart_isr(int irq, void *dev_id)
{
struct uart_port *port = (struct uart_port *)dev_id;
unsigned long flags;
@@ -198,43 +186,42 @@
/* Read the interrupt status register to determine which
* interrupt(s) is/are active.
*/
- isrstatus = xuartps_readl(XUARTPS_ISR_OFFSET);
+ isrstatus = cdns_uart_readl(CDNS_UART_ISR_OFFSET);
/*
* There is no hardware break detection, so we interpret framing
* error with all-zeros data as a break sequence. Most of the time,
* there's another non-zero byte at the end of the sequence.
*/
-
- if (isrstatus & XUARTPS_IXR_FRAMING) {
- while (!(xuartps_readl(XUARTPS_SR_OFFSET) &
- XUARTPS_SR_RXEMPTY)) {
- if (!xuartps_readl(XUARTPS_FIFO_OFFSET)) {
- port->read_status_mask |= XUARTPS_IXR_BRK;
- isrstatus &= ~XUARTPS_IXR_FRAMING;
+ if (isrstatus & CDNS_UART_IXR_FRAMING) {
+ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_RXEMPTY)) {
+ if (!cdns_uart_readl(CDNS_UART_FIFO_OFFSET)) {
+ port->read_status_mask |= CDNS_UART_IXR_BRK;
+ isrstatus &= ~CDNS_UART_IXR_FRAMING;
}
}
- xuartps_writel(XUARTPS_IXR_FRAMING, XUARTPS_ISR_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_FRAMING, CDNS_UART_ISR_OFFSET);
}
/* drop byte with parity error if IGNPAR specified */
- if (isrstatus & port->ignore_status_mask & XUARTPS_IXR_PARITY)
- isrstatus &= ~(XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT);
+ if (isrstatus & port->ignore_status_mask & CDNS_UART_IXR_PARITY)
+ isrstatus &= ~(CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT);
isrstatus &= port->read_status_mask;
isrstatus &= ~port->ignore_status_mask;
- if ((isrstatus & XUARTPS_IXR_TOUT) ||
- (isrstatus & XUARTPS_IXR_RXTRIG)) {
+ if ((isrstatus & CDNS_UART_IXR_TOUT) ||
+ (isrstatus & CDNS_UART_IXR_RXTRIG)) {
/* Receive Timeout Interrupt */
- while ((xuartps_readl(XUARTPS_SR_OFFSET) &
- XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
- data = xuartps_readl(XUARTPS_FIFO_OFFSET);
+ while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
+ data = cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
/* Non-NULL byte after BREAK is garbage (99%) */
if (data && (port->read_status_mask &
- XUARTPS_IXR_BRK)) {
- port->read_status_mask &= ~XUARTPS_IXR_BRK;
+ CDNS_UART_IXR_BRK)) {
+ port->read_status_mask &= ~CDNS_UART_IXR_BRK;
port->icount.brk++;
if (uart_handle_break(port))
continue;
@@ -258,16 +245,17 @@
port->icount.rx++;
- if (isrstatus & XUARTPS_IXR_PARITY) {
+ if (isrstatus & CDNS_UART_IXR_PARITY) {
port->icount.parity++;
status = TTY_PARITY;
- } else if (isrstatus & XUARTPS_IXR_FRAMING) {
+ } else if (isrstatus & CDNS_UART_IXR_FRAMING) {
port->icount.frame++;
status = TTY_FRAME;
- } else if (isrstatus & XUARTPS_IXR_OVERRUN)
+ } else if (isrstatus & CDNS_UART_IXR_OVERRUN) {
port->icount.overrun++;
+ }
- uart_insert_char(port, isrstatus, XUARTPS_IXR_OVERRUN,
+ uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
data, status);
}
spin_unlock(&port->lock);
@@ -276,10 +264,10 @@
}
/* Dispatch an appropriate handler */
- if ((isrstatus & XUARTPS_IXR_TXEMPTY) == XUARTPS_IXR_TXEMPTY) {
+ if ((isrstatus & CDNS_UART_IXR_TXEMPTY) == CDNS_UART_IXR_TXEMPTY) {
if (uart_circ_empty(&port->state->xmit)) {
- xuartps_writel(XUARTPS_IXR_TXEMPTY,
- XUARTPS_IDR_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TXEMPTY,
+ CDNS_UART_IDR_OFFSET);
} else {
numbytes = port->fifosize;
/* Break if no more data available in the UART buffer */
@@ -287,12 +275,12 @@
if (uart_circ_empty(&port->state->xmit))
break;
/* Get the data from the UART circular buffer
- * and write it to the xuartps's TX_FIFO
+ * and write it to the cdns_uart's TX_FIFO
* register.
*/
- xuartps_writel(
+ cdns_uart_writel(
port->state->xmit.buf[port->state->xmit.
- tail], XUARTPS_FIFO_OFFSET);
+ tail], CDNS_UART_FIFO_OFFSET);
port->icount.tx++;
@@ -300,7 +288,7 @@
* the buffer if it reaches limit.
*/
port->state->xmit.tail =
- (port->state->xmit.tail + 1) & \
+ (port->state->xmit.tail + 1) &
(UART_XMIT_SIZE - 1);
}
@@ -310,7 +298,7 @@
}
}
- xuartps_writel(isrstatus, XUARTPS_ISR_OFFSET);
+ cdns_uart_writel(isrstatus, CDNS_UART_ISR_OFFSET);
/* be sure to release the lock and tty before leaving */
spin_unlock_irqrestore(&port->lock, flags);
@@ -319,13 +307,13 @@
}
/**
- * xuartps_calc_baud_divs - Calculate baud rate divisors
+ * cdns_uart_calc_baud_divs - Calculate baud rate divisors
* @clk: UART module input clock
* @baud: Desired baud rate
* @rbdiv: BDIV value (return value)
* @rcd: CD value (return value)
* @div8: Value for clk_sel bit in mod (return value)
- * Returns baud rate, requested baud when possible, or actual baud when there
+ * Return: baud rate, requested baud when possible, or actual baud when there
* was too much error, zero if no valid divisors are found.
*
* Formula to obtain baud rate is
@@ -338,8 +326,8 @@
* baud rate generate register
* baud rate clock divisor register
*/
-static unsigned int xuartps_calc_baud_divs(unsigned int clk, unsigned int baud,
- u32 *rbdiv, u32 *rcd, int *div8)
+static unsigned int cdns_uart_calc_baud_divs(unsigned int clk,
+ unsigned int baud, u32 *rbdiv, u32 *rcd, int *div8)
{
u32 cd, bdiv;
unsigned int calc_baud;
@@ -347,16 +335,16 @@
unsigned int bauderror;
unsigned int besterror = ~0;
- if (baud < clk / ((XUARTPS_BDIV_MAX + 1) * XUARTPS_CD_MAX)) {
+ if (baud < clk / ((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX)) {
*div8 = 1;
clk /= 8;
} else {
*div8 = 0;
}
- for (bdiv = XUARTPS_BDIV_MIN; bdiv <= XUARTPS_BDIV_MAX; bdiv++) {
+ for (bdiv = CDNS_UART_BDIV_MIN; bdiv <= CDNS_UART_BDIV_MAX; bdiv++) {
cd = DIV_ROUND_CLOSEST(clk, baud * (bdiv + 1));
- if (cd < 1 || cd > XUARTPS_CD_MAX)
+ if (cd < 1 || cd > CDNS_UART_CD_MAX)
continue;
calc_baud = clk / (cd * (bdiv + 1));
@@ -381,47 +369,47 @@
}
/**
- * xuartps_set_baud_rate - Calculate and set the baud rate
+ * cdns_uart_set_baud_rate - Calculate and set the baud rate
* @port: Handle to the uart port structure
* @baud: Baud rate to set
- * Returns baud rate, requested baud when possible, or actual baud when there
+ * Return: baud rate, requested baud when possible, or actual baud when there
* was too much error, zero if no valid divisors are found.
*/
-static unsigned int xuartps_set_baud_rate(struct uart_port *port,
+static unsigned int cdns_uart_set_baud_rate(struct uart_port *port,
unsigned int baud)
{
unsigned int calc_baud;
u32 cd = 0, bdiv = 0;
u32 mreg;
int div8;
- struct xuartps *xuartps = port->private_data;
+ struct cdns_uart *cdns_uart = port->private_data;
- calc_baud = xuartps_calc_baud_divs(port->uartclk, baud, &bdiv, &cd,
+ calc_baud = cdns_uart_calc_baud_divs(port->uartclk, baud, &bdiv, &cd,
&div8);
/* Write new divisors to hardware */
- mreg = xuartps_readl(XUARTPS_MR_OFFSET);
+ mreg = cdns_uart_readl(CDNS_UART_MR_OFFSET);
if (div8)
- mreg |= XUARTPS_MR_CLKSEL;
+ mreg |= CDNS_UART_MR_CLKSEL;
else
- mreg &= ~XUARTPS_MR_CLKSEL;
- xuartps_writel(mreg, XUARTPS_MR_OFFSET);
- xuartps_writel(cd, XUARTPS_BAUDGEN_OFFSET);
- xuartps_writel(bdiv, XUARTPS_BAUDDIV_OFFSET);
- xuartps->baud = baud;
+ mreg &= ~CDNS_UART_MR_CLKSEL;
+ cdns_uart_writel(mreg, CDNS_UART_MR_OFFSET);
+ cdns_uart_writel(cd, CDNS_UART_BAUDGEN_OFFSET);
+ cdns_uart_writel(bdiv, CDNS_UART_BAUDDIV_OFFSET);
+ cdns_uart->baud = baud;
return calc_baud;
}
#ifdef CONFIG_COMMON_CLK
/**
- * xuartps_clk_notitifer_cb - Clock notifier callback
+ * cdns_uart_clk_notitifer_cb - Clock notifier callback
* @nb: Notifier block
* @event: Notify event
* @data: Notifier data
- * Returns NOTIFY_OK on success, NOTIFY_BAD on error.
+ * Return: NOTIFY_OK or NOTIFY_DONE on success, NOTIFY_BAD on error.
*/
-static int xuartps_clk_notifier_cb(struct notifier_block *nb,
+static int cdns_uart_clk_notifier_cb(struct notifier_block *nb,
unsigned long event, void *data)
{
u32 ctrl_reg;
@@ -429,35 +417,36 @@
int locked = 0;
struct clk_notifier_data *ndata = data;
unsigned long flags = 0;
- struct xuartps *xuartps = to_xuartps(nb);
+ struct cdns_uart *cdns_uart = to_cdns_uart(nb);
- port = xuartps->port;
+ port = cdns_uart->port;
if (port->suspended)
return NOTIFY_OK;
switch (event) {
case PRE_RATE_CHANGE:
{
- u32 bdiv;
- u32 cd;
+ u32 bdiv, cd;
int div8;
/*
* Find out if current baud-rate can be achieved with new clock
* frequency.
*/
- if (!xuartps_calc_baud_divs(ndata->new_rate, xuartps->baud,
- &bdiv, &cd, &div8))
+ if (!cdns_uart_calc_baud_divs(ndata->new_rate, cdns_uart->baud,
+ &bdiv, &cd, &div8)) {
+ dev_warn(port->dev, "clock rate change rejected\n");
return NOTIFY_BAD;
+ }
- spin_lock_irqsave(&xuartps->port->lock, flags);
+ spin_lock_irqsave(&cdns_uart->port->lock, flags);
/* Disable the TX and RX to set baud rate */
- xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
- (XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
- spin_unlock_irqrestore(&xuartps->port->lock, flags);
+ spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
return NOTIFY_OK;
}
@@ -467,25 +456,25 @@
* frequency.
*/
- spin_lock_irqsave(&xuartps->port->lock, flags);
+ spin_lock_irqsave(&cdns_uart->port->lock, flags);
locked = 1;
port->uartclk = ndata->new_rate;
- xuartps->baud = xuartps_set_baud_rate(xuartps->port,
- xuartps->baud);
+ cdns_uart->baud = cdns_uart_set_baud_rate(cdns_uart->port,
+ cdns_uart->baud);
/* fall through */
case ABORT_RATE_CHANGE:
if (!locked)
- spin_lock_irqsave(&xuartps->port->lock, flags);
+ spin_lock_irqsave(&cdns_uart->port->lock, flags);
/* Set TX/RX Reset */
- xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
- (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
- while (xuartps_readl(XUARTPS_CR_OFFSET) &
- (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST))
+ while (cdns_uart_readl(CDNS_UART_CR_OFFSET) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
cpu_relax();
/*
@@ -493,14 +482,13 @@
* enable bit and RX enable bit to enable the transmitter and
* receiver.
*/
- xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
- ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
- xuartps_writel(
- (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) |
- (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+ ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
- spin_unlock_irqrestore(&xuartps->port->lock, flags);
+ spin_unlock_irqrestore(&cdns_uart->port->lock, flags);
return NOTIFY_OK;
default:
@@ -509,40 +497,36 @@
}
#endif
-/*----------------------Uart Operations---------------------------*/
-
/**
- * xuartps_start_tx - Start transmitting bytes
+ * cdns_uart_start_tx - Start transmitting bytes
* @port: Handle to the uart port structure
- *
- **/
-static void xuartps_start_tx(struct uart_port *port)
+ */
+static void cdns_uart_start_tx(struct uart_port *port)
{
unsigned int status, numbytes = port->fifosize;
if (uart_circ_empty(&port->state->xmit) || uart_tx_stopped(port))
return;
- status = xuartps_readl(XUARTPS_CR_OFFSET);
+ status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
/* Set the TX enable bit and clear the TX disable bit to enable the
* transmitter.
*/
- xuartps_writel((status & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN,
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel((status & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN,
+ CDNS_UART_CR_OFFSET);
- while (numbytes-- && ((xuartps_readl(XUARTPS_SR_OFFSET)
- & XUARTPS_SR_TXFULL)) != XUARTPS_SR_TXFULL) {
-
+ while (numbytes-- && ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_TXFULL)) != CDNS_UART_SR_TXFULL) {
/* Break if no more data available in the UART buffer */
if (uart_circ_empty(&port->state->xmit))
break;
/* Get the data from the UART circular buffer and
- * write it to the xuartps's TX_FIFO register.
+ * write it to the cdns_uart's TX_FIFO register.
*/
- xuartps_writel(
+ cdns_uart_writel(
port->state->xmit.buf[port->state->xmit.tail],
- XUARTPS_FIFO_OFFSET);
+ CDNS_UART_FIFO_OFFSET);
port->icount.tx++;
/* Adjust the tail of the UART buffer and wrap
@@ -551,94 +535,90 @@
port->state->xmit.tail = (port->state->xmit.tail + 1) &
(UART_XMIT_SIZE - 1);
}
- xuartps_writel(XUARTPS_IXR_TXEMPTY, XUARTPS_ISR_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_ISR_OFFSET);
/* Enable the TX Empty interrupt */
- xuartps_writel(XUARTPS_IXR_TXEMPTY, XUARTPS_IER_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TXEMPTY, CDNS_UART_IER_OFFSET);
if (uart_circ_chars_pending(&port->state->xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
/**
- * xuartps_stop_tx - Stop TX
+ * cdns_uart_stop_tx - Stop TX
* @port: Handle to the uart port structure
- *
- **/
-static void xuartps_stop_tx(struct uart_port *port)
+ */
+static void cdns_uart_stop_tx(struct uart_port *port)
{
unsigned int regval;
- regval = xuartps_readl(XUARTPS_CR_OFFSET);
- regval |= XUARTPS_CR_TX_DIS;
+ regval = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ regval |= CDNS_UART_CR_TX_DIS;
/* Disable the transmitter */
- xuartps_writel(regval, XUARTPS_CR_OFFSET);
+ cdns_uart_writel(regval, CDNS_UART_CR_OFFSET);
}
/**
- * xuartps_stop_rx - Stop RX
+ * cdns_uart_stop_rx - Stop RX
* @port: Handle to the uart port structure
- *
- **/
-static void xuartps_stop_rx(struct uart_port *port)
+ */
+static void cdns_uart_stop_rx(struct uart_port *port)
{
unsigned int regval;
- regval = xuartps_readl(XUARTPS_CR_OFFSET);
- regval |= XUARTPS_CR_RX_DIS;
+ regval = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ regval |= CDNS_UART_CR_RX_DIS;
/* Disable the receiver */
- xuartps_writel(regval, XUARTPS_CR_OFFSET);
+ cdns_uart_writel(regval, CDNS_UART_CR_OFFSET);
}
/**
- * xuartps_tx_empty - Check whether TX is empty
+ * cdns_uart_tx_empty - Check whether TX is empty
* @port: Handle to the uart port structure
*
- * Returns TIOCSER_TEMT on success, 0 otherwise
- **/
-static unsigned int xuartps_tx_empty(struct uart_port *port)
+ * Return: TIOCSER_TEMT on success, 0 otherwise
+ */
+static unsigned int cdns_uart_tx_empty(struct uart_port *port)
{
unsigned int status;
- status = xuartps_readl(XUARTPS_ISR_OFFSET) & XUARTPS_IXR_TXEMPTY;
+ status = cdns_uart_readl(CDNS_UART_ISR_OFFSET) & CDNS_UART_IXR_TXEMPTY;
return status ? TIOCSER_TEMT : 0;
}
/**
- * xuartps_break_ctl - Based on the input ctl we have to start or stop
+ * cdns_uart_break_ctl - Based on the input ctl we have to start or stop
* transmitting char breaks
* @port: Handle to the uart port structure
* @ctl: Value based on which start or stop decision is taken
- *
- **/
-static void xuartps_break_ctl(struct uart_port *port, int ctl)
+ */
+static void cdns_uart_break_ctl(struct uart_port *port, int ctl)
{
unsigned int status;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
- status = xuartps_readl(XUARTPS_CR_OFFSET);
+ status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
if (ctl == -1)
- xuartps_writel(XUARTPS_CR_STARTBRK | status,
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel(CDNS_UART_CR_STARTBRK | status,
+ CDNS_UART_CR_OFFSET);
else {
- if ((status & XUARTPS_CR_STOPBRK) == 0)
- xuartps_writel(XUARTPS_CR_STOPBRK | status,
- XUARTPS_CR_OFFSET);
+ if ((status & CDNS_UART_CR_STOPBRK) == 0)
+ cdns_uart_writel(CDNS_UART_CR_STOPBRK | status,
+ CDNS_UART_CR_OFFSET);
}
spin_unlock_irqrestore(&port->lock, flags);
}
/**
- * xuartps_set_termios - termios operations, handling data length, parity,
+ * cdns_uart_set_termios - termios operations, handling data length, parity,
* stop bits, flow control, baud rate
* @port: Handle to the uart port structure
* @termios: Handle to the input termios structure
* @old: Values of the previously saved termios structure
- *
- **/
-static void xuartps_set_termios(struct uart_port *port,
+ */
+static void cdns_uart_set_termios(struct uart_port *port,
struct ktermios *termios, struct ktermios *old)
{
unsigned int cval = 0;
@@ -649,81 +629,79 @@
spin_lock_irqsave(&port->lock, flags);
/* Empty the receive FIFO 1st before making changes */
- while ((xuartps_readl(XUARTPS_SR_OFFSET) &
- XUARTPS_SR_RXEMPTY) != XUARTPS_SR_RXEMPTY) {
- xuartps_readl(XUARTPS_FIFO_OFFSET);
+ while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_RXEMPTY) != CDNS_UART_SR_RXEMPTY) {
+ cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
}
/* Disable the TX and RX to set baud rate */
- xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
- (XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg |= CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
/*
* Min baud rate = 6bps and Max Baud Rate is 10Mbps for 100Mhz clk
* min and max baud should be calculated here based on port->uartclk.
* this way we get a valid baud and can safely call set_baud()
*/
- minbaud = port->uartclk / ((XUARTPS_BDIV_MAX + 1) * XUARTPS_CD_MAX * 8);
- maxbaud = port->uartclk / (XUARTPS_BDIV_MIN + 1);
+ minbaud = port->uartclk /
+ ((CDNS_UART_BDIV_MAX + 1) * CDNS_UART_CD_MAX * 8);
+ maxbaud = port->uartclk / (CDNS_UART_BDIV_MIN + 1);
baud = uart_get_baud_rate(port, termios, old, minbaud, maxbaud);
- baud = xuartps_set_baud_rate(port, baud);
+ baud = cdns_uart_set_baud_rate(port, baud);
if (tty_termios_baud_rate(termios))
tty_termios_encode_baud_rate(termios, baud, baud);
- /*
- * Update the per-port timeout.
- */
+ /* Update the per-port timeout. */
uart_update_timeout(port, termios->c_cflag, baud);
/* Set TX/RX Reset */
- xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
- (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
- ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
-
- /* Clear the RX disable and TX disable bits and then set the TX enable
+ /*
+ * Clear the RX disable and TX disable bits and then set the TX enable
* bit and RX enable bit to enable the transmitter and receiver.
*/
- xuartps_writel(
- (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
- | (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+ ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
- xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+ cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
- port->read_status_mask = XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_RXTRIG |
- XUARTPS_IXR_OVERRUN | XUARTPS_IXR_TOUT;
+ port->read_status_mask = CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_RXTRIG |
+ CDNS_UART_IXR_OVERRUN | CDNS_UART_IXR_TOUT;
port->ignore_status_mask = 0;
if (termios->c_iflag & INPCK)
- port->read_status_mask |= XUARTPS_IXR_PARITY |
- XUARTPS_IXR_FRAMING;
+ port->read_status_mask |= CDNS_UART_IXR_PARITY |
+ CDNS_UART_IXR_FRAMING;
if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= XUARTPS_IXR_PARITY |
- XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+ port->ignore_status_mask |= CDNS_UART_IXR_PARITY |
+ CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
/* ignore all characters if CREAD is not set */
if ((termios->c_cflag & CREAD) == 0)
- port->ignore_status_mask |= XUARTPS_IXR_RXTRIG |
- XUARTPS_IXR_TOUT | XUARTPS_IXR_PARITY |
- XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN;
+ port->ignore_status_mask |= CDNS_UART_IXR_RXTRIG |
+ CDNS_UART_IXR_TOUT | CDNS_UART_IXR_PARITY |
+ CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN;
- mode_reg = xuartps_readl(XUARTPS_MR_OFFSET);
+ mode_reg = cdns_uart_readl(CDNS_UART_MR_OFFSET);
/* Handling Data Size */
switch (termios->c_cflag & CSIZE) {
case CS6:
- cval |= XUARTPS_MR_CHARLEN_6_BIT;
+ cval |= CDNS_UART_MR_CHARLEN_6_BIT;
break;
case CS7:
- cval |= XUARTPS_MR_CHARLEN_7_BIT;
+ cval |= CDNS_UART_MR_CHARLEN_7_BIT;
break;
default:
case CS8:
- cval |= XUARTPS_MR_CHARLEN_8_BIT;
+ cval |= CDNS_UART_MR_CHARLEN_8_BIT;
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= CS8;
break;
@@ -731,134 +709,135 @@
/* Handling Parity and Stop Bits length */
if (termios->c_cflag & CSTOPB)
- cval |= XUARTPS_MR_STOPMODE_2_BIT; /* 2 STOP bits */
+ cval |= CDNS_UART_MR_STOPMODE_2_BIT; /* 2 STOP bits */
else
- cval |= XUARTPS_MR_STOPMODE_1_BIT; /* 1 STOP bit */
+ cval |= CDNS_UART_MR_STOPMODE_1_BIT; /* 1 STOP bit */
if (termios->c_cflag & PARENB) {
/* Mark or Space parity */
if (termios->c_cflag & CMSPAR) {
if (termios->c_cflag & PARODD)
- cval |= XUARTPS_MR_PARITY_MARK;
+ cval |= CDNS_UART_MR_PARITY_MARK;
else
- cval |= XUARTPS_MR_PARITY_SPACE;
+ cval |= CDNS_UART_MR_PARITY_SPACE;
} else {
if (termios->c_cflag & PARODD)
- cval |= XUARTPS_MR_PARITY_ODD;
+ cval |= CDNS_UART_MR_PARITY_ODD;
else
- cval |= XUARTPS_MR_PARITY_EVEN;
+ cval |= CDNS_UART_MR_PARITY_EVEN;
}
} else {
- cval |= XUARTPS_MR_PARITY_NONE;
+ cval |= CDNS_UART_MR_PARITY_NONE;
}
cval |= mode_reg & 1;
- xuartps_writel(cval, XUARTPS_MR_OFFSET);
+ cdns_uart_writel(cval, CDNS_UART_MR_OFFSET);
spin_unlock_irqrestore(&port->lock, flags);
}
/**
- * xuartps_startup - Called when an application opens a xuartps port
+ * cdns_uart_startup - Called when an application opens a cdns_uart port
* @port: Handle to the uart port structure
*
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_startup(struct uart_port *port)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_startup(struct uart_port *port)
{
unsigned int retval = 0, status = 0;
- retval = request_irq(port->irq, xuartps_isr, 0, XUARTPS_NAME,
+ retval = request_irq(port->irq, cdns_uart_isr, 0, CDNS_UART_NAME,
(void *)port);
if (retval)
return retval;
/* Disable the TX and RX */
- xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
+ CDNS_UART_CR_OFFSET);
/* Set the Control Register with TX/RX Enable, TX/RX Reset,
* no break chars.
*/
- xuartps_writel(XUARTPS_CR_TXRST | XUARTPS_CR_RXRST,
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel(CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST,
+ CDNS_UART_CR_OFFSET);
- status = xuartps_readl(XUARTPS_CR_OFFSET);
+ status = cdns_uart_readl(CDNS_UART_CR_OFFSET);
/* Clear the RX disable and TX disable bits and then set the TX enable
* bit and RX enable bit to enable the transmitter and receiver.
*/
- xuartps_writel((status & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS))
- | (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN |
- XUARTPS_CR_STOPBRK), XUARTPS_CR_OFFSET);
+ cdns_uart_writel((status & ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS))
+ | (CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN |
+ CDNS_UART_CR_STOPBRK), CDNS_UART_CR_OFFSET);
/* Set the Mode Register with normal mode,8 data bits,1 stop bit,
* no parity.
*/
- xuartps_writel(XUARTPS_MR_CHMODE_NORM | XUARTPS_MR_STOPMODE_1_BIT
- | XUARTPS_MR_PARITY_NONE | XUARTPS_MR_CHARLEN_8_BIT,
- XUARTPS_MR_OFFSET);
+ cdns_uart_writel(CDNS_UART_MR_CHMODE_NORM | CDNS_UART_MR_STOPMODE_1_BIT
+ | CDNS_UART_MR_PARITY_NONE | CDNS_UART_MR_CHARLEN_8_BIT,
+ CDNS_UART_MR_OFFSET);
/*
* Set the RX FIFO Trigger level to use most of the FIFO, but it
* can be tuned with a module parameter
*/
- xuartps_writel(rx_trigger_level, XUARTPS_RXWM_OFFSET);
+ cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET);
/*
* Receive Timeout register is enabled but it
* can be tuned with a module parameter
*/
- xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+ cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
/* Clear out any pending interrupts before enabling them */
- xuartps_writel(xuartps_readl(XUARTPS_ISR_OFFSET), XUARTPS_ISR_OFFSET);
+ cdns_uart_writel(cdns_uart_readl(CDNS_UART_ISR_OFFSET),
+ CDNS_UART_ISR_OFFSET);
/* Set the Interrupt Registers with desired interrupts */
- xuartps_writel(XUARTPS_IXR_TXEMPTY | XUARTPS_IXR_PARITY |
- XUARTPS_IXR_FRAMING | XUARTPS_IXR_OVERRUN |
- XUARTPS_IXR_RXTRIG | XUARTPS_IXR_TOUT, XUARTPS_IER_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TXEMPTY | CDNS_UART_IXR_PARITY |
+ CDNS_UART_IXR_FRAMING | CDNS_UART_IXR_OVERRUN |
+ CDNS_UART_IXR_RXTRIG | CDNS_UART_IXR_TOUT,
+ CDNS_UART_IER_OFFSET);
return retval;
}
/**
- * xuartps_shutdown - Called when an application closes a xuartps port
+ * cdns_uart_shutdown - Called when an application closes a cdns_uart port
* @port: Handle to the uart port structure
- *
- **/
-static void xuartps_shutdown(struct uart_port *port)
+ */
+static void cdns_uart_shutdown(struct uart_port *port)
{
int status;
/* Disable interrupts */
- status = xuartps_readl(XUARTPS_IMR_OFFSET);
- xuartps_writel(status, XUARTPS_IDR_OFFSET);
+ status = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+ cdns_uart_writel(status, CDNS_UART_IDR_OFFSET);
/* Disable the TX and RX */
- xuartps_writel(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS,
- XUARTPS_CR_OFFSET);
+ cdns_uart_writel(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS,
+ CDNS_UART_CR_OFFSET);
free_irq(port->irq, port);
}
/**
- * xuartps_type - Set UART type to xuartps port
+ * cdns_uart_type - Set UART type to cdns_uart port
* @port: Handle to the uart port structure
*
- * Returns string on success, NULL otherwise
- **/
-static const char *xuartps_type(struct uart_port *port)
+ * Return: string on success, NULL otherwise
+ */
+static const char *cdns_uart_type(struct uart_port *port)
{
- return port->type == PORT_XUARTPS ? XUARTPS_NAME : NULL;
+ return port->type == PORT_XUARTPS ? CDNS_UART_NAME : NULL;
}
/**
- * xuartps_verify_port - Verify the port params
+ * cdns_uart_verify_port - Verify the port params
* @port: Handle to the uart port structure
* @ser: Handle to the structure whose members are compared
*
- * Returns 0 if success otherwise -EINVAL
- **/
-static int xuartps_verify_port(struct uart_port *port,
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int cdns_uart_verify_port(struct uart_port *port,
struct serial_struct *ser)
{
if (ser->type != PORT_UNKNOWN && ser->type != PORT_XUARTPS)
@@ -875,187 +854,170 @@
}
/**
- * xuartps_request_port - Claim the memory region attached to xuartps port,
- * called when the driver adds a xuartps port via
+ * cdns_uart_request_port - Claim the memory region attached to cdns_uart port,
+ * called when the driver adds a cdns_uart port via
* uart_add_one_port()
* @port: Handle to the uart port structure
*
- * Returns 0, -ENOMEM if request fails
- **/
-static int xuartps_request_port(struct uart_port *port)
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int cdns_uart_request_port(struct uart_port *port)
{
- if (!request_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE,
- XUARTPS_NAME)) {
+ if (!request_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE,
+ CDNS_UART_NAME)) {
return -ENOMEM;
}
- port->membase = ioremap(port->mapbase, XUARTPS_REGISTER_SPACE);
+ port->membase = ioremap(port->mapbase, CDNS_UART_REGISTER_SPACE);
if (!port->membase) {
dev_err(port->dev, "Unable to map registers\n");
- release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+ release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
return -ENOMEM;
}
return 0;
}
/**
- * xuartps_release_port - Release the memory region attached to a xuartps
- * port, called when the driver removes a xuartps
- * port via uart_remove_one_port().
+ * cdns_uart_release_port - Release UART port
* @port: Handle to the uart port structure
*
- **/
-static void xuartps_release_port(struct uart_port *port)
+ * Release the memory region attached to a cdns_uart port. Called when the
+ * driver removes a cdns_uart port via uart_remove_one_port().
+ */
+static void cdns_uart_release_port(struct uart_port *port)
{
- release_mem_region(port->mapbase, XUARTPS_REGISTER_SPACE);
+ release_mem_region(port->mapbase, CDNS_UART_REGISTER_SPACE);
iounmap(port->membase);
port->membase = NULL;
}
/**
- * xuartps_config_port - Configure xuartps, called when the driver adds a
- * xuartps port
+ * cdns_uart_config_port - Configure UART port
* @port: Handle to the uart port structure
* @flags: If any
- *
- **/
-static void xuartps_config_port(struct uart_port *port, int flags)
+ */
+static void cdns_uart_config_port(struct uart_port *port, int flags)
{
- if (flags & UART_CONFIG_TYPE && xuartps_request_port(port) == 0)
+ if (flags & UART_CONFIG_TYPE && cdns_uart_request_port(port) == 0)
port->type = PORT_XUARTPS;
}
/**
- * xuartps_get_mctrl - Get the modem control state
- *
+ * cdns_uart_get_mctrl - Get the modem control state
* @port: Handle to the uart port structure
*
- * Returns the modem control state
- *
- **/
-static unsigned int xuartps_get_mctrl(struct uart_port *port)
+ * Return: the modem control state
+ */
+static unsigned int cdns_uart_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}
-static void xuartps_set_mctrl(struct uart_port *port, unsigned int mctrl)
+static void cdns_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* N/A */
}
-static void xuartps_enable_ms(struct uart_port *port)
+static void cdns_uart_enable_ms(struct uart_port *port)
{
/* N/A */
}
#ifdef CONFIG_CONSOLE_POLL
-static int xuartps_poll_get_char(struct uart_port *port)
+static int cdns_uart_poll_get_char(struct uart_port *port)
{
u32 imr;
int c;
/* Disable all interrupts */
- imr = xuartps_readl(XUARTPS_IMR_OFFSET);
- xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+ imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+ cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
/* Check if FIFO is empty */
- if (xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY)
+ if (cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_RXEMPTY)
c = NO_POLL_CHAR;
else /* Read a character */
- c = (unsigned char) xuartps_readl(XUARTPS_FIFO_OFFSET);
+ c = (unsigned char) cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
/* Enable interrupts */
- xuartps_writel(imr, XUARTPS_IER_OFFSET);
+ cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
return c;
}
-static void xuartps_poll_put_char(struct uart_port *port, unsigned char c)
+static void cdns_uart_poll_put_char(struct uart_port *port, unsigned char c)
{
u32 imr;
/* Disable all interrupts */
- imr = xuartps_readl(XUARTPS_IMR_OFFSET);
- xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+ imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+ cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
/* Wait until FIFO is empty */
- while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
+ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY))
cpu_relax();
/* Write a character */
- xuartps_writel(c, XUARTPS_FIFO_OFFSET);
+ cdns_uart_writel(c, CDNS_UART_FIFO_OFFSET);
/* Wait until FIFO is empty */
- while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY))
+ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY))
cpu_relax();
/* Enable interrupts */
- xuartps_writel(imr, XUARTPS_IER_OFFSET);
+ cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
return;
}
#endif
-/** The UART operations structure
- */
-static struct uart_ops xuartps_ops = {
- .set_mctrl = xuartps_set_mctrl,
- .get_mctrl = xuartps_get_mctrl,
- .enable_ms = xuartps_enable_ms,
-
- .start_tx = xuartps_start_tx, /* Start transmitting */
- .stop_tx = xuartps_stop_tx, /* Stop transmission */
- .stop_rx = xuartps_stop_rx, /* Stop reception */
- .tx_empty = xuartps_tx_empty, /* Transmitter busy? */
- .break_ctl = xuartps_break_ctl, /* Start/stop
- * transmitting break
- */
- .set_termios = xuartps_set_termios, /* Set termios */
- .startup = xuartps_startup, /* App opens xuartps */
- .shutdown = xuartps_shutdown, /* App closes xuartps */
- .type = xuartps_type, /* Set UART type */
- .verify_port = xuartps_verify_port, /* Verification of port
- * params
- */
- .request_port = xuartps_request_port, /* Claim resources
- * associated with a
- * xuartps port
- */
- .release_port = xuartps_release_port, /* Release resources
- * associated with a
- * xuartps port
- */
- .config_port = xuartps_config_port, /* Configure when driver
- * adds a xuartps port
- */
+static struct uart_ops cdns_uart_ops = {
+ .set_mctrl = cdns_uart_set_mctrl,
+ .get_mctrl = cdns_uart_get_mctrl,
+ .enable_ms = cdns_uart_enable_ms,
+ .start_tx = cdns_uart_start_tx,
+ .stop_tx = cdns_uart_stop_tx,
+ .stop_rx = cdns_uart_stop_rx,
+ .tx_empty = cdns_uart_tx_empty,
+ .break_ctl = cdns_uart_break_ctl,
+ .set_termios = cdns_uart_set_termios,
+ .startup = cdns_uart_startup,
+ .shutdown = cdns_uart_shutdown,
+ .type = cdns_uart_type,
+ .verify_port = cdns_uart_verify_port,
+ .request_port = cdns_uart_request_port,
+ .release_port = cdns_uart_release_port,
+ .config_port = cdns_uart_config_port,
#ifdef CONFIG_CONSOLE_POLL
- .poll_get_char = xuartps_poll_get_char,
- .poll_put_char = xuartps_poll_put_char,
+ .poll_get_char = cdns_uart_poll_get_char,
+ .poll_put_char = cdns_uart_poll_put_char,
#endif
};
-static struct uart_port xuartps_port[2];
+static struct uart_port cdns_uart_port[2];
/**
- * xuartps_get_port - Configure the port from the platform device resource
- * info
+ * cdns_uart_get_port - Configure the port from platform device resource info
+ * @id: Port id
*
- * Returns a pointer to a uart_port or NULL for failure
- **/
-static struct uart_port *xuartps_get_port(void)
+ * Return: a pointer to a uart_port or NULL for failure
+ */
+static struct uart_port *cdns_uart_get_port(int id)
{
struct uart_port *port;
- int id;
- /* Find the next unused port */
- for (id = 0; id < XUARTPS_NR_PORTS; id++)
- if (xuartps_port[id].mapbase == 0)
- break;
+ /* Try the given port id if failed use default method */
+ if (cdns_uart_port[id].mapbase != 0) {
+ /* Find the next unused port */
+ for (id = 0; id < CDNS_UART_NR_PORTS; id++)
+ if (cdns_uart_port[id].mapbase == 0)
+ break;
+ }
- if (id >= XUARTPS_NR_PORTS)
+ if (id >= CDNS_UART_NR_PORTS)
return NULL;
- port = &xuartps_port[id];
+ port = &cdns_uart_port[id];
/* At this point, we've got an empty uart_port struct, initialize it */
spin_lock_init(&port->lock);
@@ -1065,50 +1027,46 @@
port->type = PORT_UNKNOWN;
port->iotype = UPIO_MEM32;
port->flags = UPF_BOOT_AUTOCONF;
- port->ops = &xuartps_ops;
- port->fifosize = XUARTPS_FIFO_SIZE;
+ port->ops = &cdns_uart_ops;
+ port->fifosize = CDNS_UART_FIFO_SIZE;
port->line = id;
port->dev = NULL;
return port;
}
-/*-----------------------Console driver operations--------------------------*/
-
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
/**
- * xuartps_console_wait_tx - Wait for the TX to be full
+ * cdns_uart_console_wait_tx - Wait for the TX to be full
* @port: Handle to the uart port structure
- *
- **/
-static void xuartps_console_wait_tx(struct uart_port *port)
+ */
+static void cdns_uart_console_wait_tx(struct uart_port *port)
{
- while ((xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_TXEMPTY)
- != XUARTPS_SR_TXEMPTY)
+ while ((cdns_uart_readl(CDNS_UART_SR_OFFSET) & CDNS_UART_SR_TXEMPTY)
+ != CDNS_UART_SR_TXEMPTY)
barrier();
}
/**
- * xuartps_console_putchar - write the character to the FIFO buffer
+ * cdns_uart_console_putchar - write the character to the FIFO buffer
* @port: Handle to the uart port structure
* @ch: Character to be written
- *
- **/
-static void xuartps_console_putchar(struct uart_port *port, int ch)
+ */
+static void cdns_uart_console_putchar(struct uart_port *port, int ch)
{
- xuartps_console_wait_tx(port);
- xuartps_writel(ch, XUARTPS_FIFO_OFFSET);
+ cdns_uart_console_wait_tx(port);
+ cdns_uart_writel(ch, CDNS_UART_FIFO_OFFSET);
}
/**
- * xuartps_console_write - perform write operation
- * @port: Handle to the uart port structure
+ * cdns_uart_console_write - perform write operation
+ * @co: Console handle
* @s: Pointer to character array
* @count: No of characters
- **/
-static void xuartps_console_write(struct console *co, const char *s,
+ */
+static void cdns_uart_console_write(struct console *co, const char *s,
unsigned int count)
{
- struct uart_port *port = &xuartps_port[co->index];
+ struct uart_port *port = &cdns_uart_port[co->index];
unsigned long flags;
unsigned int imr, ctrl;
int locked = 1;
@@ -1119,49 +1077,45 @@
spin_lock_irqsave(&port->lock, flags);
/* save and disable interrupt */
- imr = xuartps_readl(XUARTPS_IMR_OFFSET);
- xuartps_writel(imr, XUARTPS_IDR_OFFSET);
+ imr = cdns_uart_readl(CDNS_UART_IMR_OFFSET);
+ cdns_uart_writel(imr, CDNS_UART_IDR_OFFSET);
/*
* Make sure that the tx part is enabled. Set the TX enable bit and
* clear the TX disable bit to enable the transmitter.
*/
- ctrl = xuartps_readl(XUARTPS_CR_OFFSET);
- xuartps_writel((ctrl & ~XUARTPS_CR_TX_DIS) | XUARTPS_CR_TX_EN,
- XUARTPS_CR_OFFSET);
+ ctrl = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ cdns_uart_writel((ctrl & ~CDNS_UART_CR_TX_DIS) | CDNS_UART_CR_TX_EN,
+ CDNS_UART_CR_OFFSET);
- uart_console_write(port, s, count, xuartps_console_putchar);
- xuartps_console_wait_tx(port);
+ uart_console_write(port, s, count, cdns_uart_console_putchar);
+ cdns_uart_console_wait_tx(port);
- xuartps_writel(ctrl, XUARTPS_CR_OFFSET);
+ cdns_uart_writel(ctrl, CDNS_UART_CR_OFFSET);
- /* restore interrupt state, it seems like there may be a h/w bug
- * in that the interrupt enable register should not need to be
- * written based on the data sheet
- */
- xuartps_writel(~imr, XUARTPS_IDR_OFFSET);
- xuartps_writel(imr, XUARTPS_IER_OFFSET);
+ /* restore interrupt state */
+ cdns_uart_writel(imr, CDNS_UART_IER_OFFSET);
if (locked)
spin_unlock_irqrestore(&port->lock, flags);
}
/**
- * xuartps_console_setup - Initialize the uart to default config
+ * cdns_uart_console_setup - Initialize the uart to default config
* @co: Console handle
* @options: Initial settings of uart
*
- * Returns 0, -ENODEV if no device
- **/
-static int __init xuartps_console_setup(struct console *co, char *options)
+ * Return: 0 on success, negative errno otherwise.
+ */
+static int __init cdns_uart_console_setup(struct console *co, char *options)
{
- struct uart_port *port = &xuartps_port[co->index];
+ struct uart_port *port = &cdns_uart_port[co->index];
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
- if (co->index < 0 || co->index >= XUARTPS_NR_PORTS)
+ if (co->index < 0 || co->index >= CDNS_UART_NR_PORTS)
return -EINVAL;
if (!port->mapbase) {
@@ -1175,55 +1129,53 @@
return uart_set_options(port, co, baud, parity, bits, flow);
}
-static struct uart_driver xuartps_uart_driver;
+static struct uart_driver cdns_uart_uart_driver;
-static struct console xuartps_console = {
- .name = XUARTPS_TTY_NAME,
- .write = xuartps_console_write,
+static struct console cdns_uart_console = {
+ .name = CDNS_UART_TTY_NAME,
+ .write = cdns_uart_console_write,
.device = uart_console_device,
- .setup = xuartps_console_setup,
+ .setup = cdns_uart_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1, /* Specified on the cmdline (e.g. console=ttyPS ) */
- .data = &xuartps_uart_driver,
+ .data = &cdns_uart_uart_driver,
};
/**
- * xuartps_console_init - Initialization call
+ * cdns_uart_console_init - Initialization call
*
- * Returns 0 on success, negative error otherwise
- **/
-static int __init xuartps_console_init(void)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int __init cdns_uart_console_init(void)
{
- register_console(&xuartps_console);
+ register_console(&cdns_uart_console);
return 0;
}
-console_initcall(xuartps_console_init);
+console_initcall(cdns_uart_console_init);
#endif /* CONFIG_SERIAL_XILINX_PS_UART_CONSOLE */
-/** Structure Definitions
- */
-static struct uart_driver xuartps_uart_driver = {
- .owner = THIS_MODULE, /* Owner */
- .driver_name = XUARTPS_NAME, /* Driver name */
- .dev_name = XUARTPS_TTY_NAME, /* Node name */
- .major = XUARTPS_MAJOR, /* Major number */
- .minor = XUARTPS_MINOR, /* Minor number */
- .nr = XUARTPS_NR_PORTS, /* Number of UART ports */
+static struct uart_driver cdns_uart_uart_driver = {
+ .owner = THIS_MODULE,
+ .driver_name = CDNS_UART_NAME,
+ .dev_name = CDNS_UART_TTY_NAME,
+ .major = CDNS_UART_MAJOR,
+ .minor = CDNS_UART_MINOR,
+ .nr = CDNS_UART_NR_PORTS,
#ifdef CONFIG_SERIAL_XILINX_PS_UART_CONSOLE
- .cons = &xuartps_console, /* Console */
+ .cons = &cdns_uart_console,
#endif
};
#ifdef CONFIG_PM_SLEEP
/**
- * xuartps_suspend - suspend event
+ * cdns_uart_suspend - suspend event
* @device: Pointer to the device structure
*
- * Returns 0
+ * Return: 0
*/
-static int xuartps_suspend(struct device *device)
+static int cdns_uart_suspend(struct device *device)
{
struct uart_port *port = dev_get_drvdata(device);
struct tty_struct *tty;
@@ -1242,23 +1194,24 @@
* Call the API provided in serial_core.c file which handles
* the suspend.
*/
- uart_suspend_port(&xuartps_uart_driver, port);
+ uart_suspend_port(&cdns_uart_uart_driver, port);
if (console_suspend_enabled && !may_wake) {
- struct xuartps *xuartps = port->private_data;
+ struct cdns_uart *cdns_uart = port->private_data;
- clk_disable(xuartps->refclk);
- clk_disable(xuartps->aperclk);
+ clk_disable(cdns_uart->uartclk);
+ clk_disable(cdns_uart->pclk);
} else {
unsigned long flags = 0;
spin_lock_irqsave(&port->lock, flags);
/* Empty the receive FIFO 1st before making changes */
- while (!(xuartps_readl(XUARTPS_SR_OFFSET) & XUARTPS_SR_RXEMPTY))
- xuartps_readl(XUARTPS_FIFO_OFFSET);
+ while (!(cdns_uart_readl(CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_RXEMPTY))
+ cdns_uart_readl(CDNS_UART_FIFO_OFFSET);
/* set RX trigger level to 1 */
- xuartps_writel(1, XUARTPS_RXWM_OFFSET);
+ cdns_uart_writel(1, CDNS_UART_RXWM_OFFSET);
/* disable RX timeout interrups */
- xuartps_writel(XUARTPS_IXR_TOUT, XUARTPS_IDR_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IDR_OFFSET);
spin_unlock_irqrestore(&port->lock, flags);
}
@@ -1266,12 +1219,12 @@
}
/**
- * xuartps_resume - Resume after a previous suspend
+ * cdns_uart_resume - Resume after a previous suspend
* @device: Pointer to the device structure
*
- * Returns 0
+ * Return: 0
*/
-static int xuartps_resume(struct device *device)
+static int cdns_uart_resume(struct device *device)
{
struct uart_port *port = dev_get_drvdata(device);
unsigned long flags = 0;
@@ -1289,87 +1242,95 @@
}
if (console_suspend_enabled && !may_wake) {
- struct xuartps *xuartps = port->private_data;
+ struct cdns_uart *cdns_uart = port->private_data;
- clk_enable(xuartps->aperclk);
- clk_enable(xuartps->refclk);
+ clk_enable(cdns_uart->pclk);
+ clk_enable(cdns_uart->uartclk);
spin_lock_irqsave(&port->lock, flags);
/* Set TX/RX Reset */
- xuartps_writel(xuartps_readl(XUARTPS_CR_OFFSET) |
- (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST),
- XUARTPS_CR_OFFSET);
- while (xuartps_readl(XUARTPS_CR_OFFSET) &
- (XUARTPS_CR_TXRST | XUARTPS_CR_RXRST))
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg |= CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
+ while (cdns_uart_readl(CDNS_UART_CR_OFFSET) &
+ (CDNS_UART_CR_TXRST | CDNS_UART_CR_RXRST))
cpu_relax();
/* restore rx timeout value */
- xuartps_writel(rx_timeout, XUARTPS_RXTOUT_OFFSET);
+ cdns_uart_writel(rx_timeout, CDNS_UART_RXTOUT_OFFSET);
/* Enable Tx/Rx */
- ctrl_reg = xuartps_readl(XUARTPS_CR_OFFSET);
- xuartps_writel(
- (ctrl_reg & ~(XUARTPS_CR_TX_DIS | XUARTPS_CR_RX_DIS)) |
- (XUARTPS_CR_TX_EN | XUARTPS_CR_RX_EN),
- XUARTPS_CR_OFFSET);
+ ctrl_reg = cdns_uart_readl(CDNS_UART_CR_OFFSET);
+ ctrl_reg &= ~(CDNS_UART_CR_TX_DIS | CDNS_UART_CR_RX_DIS);
+ ctrl_reg |= CDNS_UART_CR_TX_EN | CDNS_UART_CR_RX_EN;
+ cdns_uart_writel(ctrl_reg, CDNS_UART_CR_OFFSET);
spin_unlock_irqrestore(&port->lock, flags);
} else {
spin_lock_irqsave(&port->lock, flags);
/* restore original rx trigger level */
- xuartps_writel(rx_trigger_level, XUARTPS_RXWM_OFFSET);
+ cdns_uart_writel(rx_trigger_level, CDNS_UART_RXWM_OFFSET);
/* enable RX timeout interrupt */
- xuartps_writel(XUARTPS_IXR_TOUT, XUARTPS_IER_OFFSET);
+ cdns_uart_writel(CDNS_UART_IXR_TOUT, CDNS_UART_IER_OFFSET);
spin_unlock_irqrestore(&port->lock, flags);
}
- return uart_resume_port(&xuartps_uart_driver, port);
+ return uart_resume_port(&cdns_uart_uart_driver, port);
}
#endif /* ! CONFIG_PM_SLEEP */
-static SIMPLE_DEV_PM_OPS(xuartps_dev_pm_ops, xuartps_suspend, xuartps_resume);
+static SIMPLE_DEV_PM_OPS(cdns_uart_dev_pm_ops, cdns_uart_suspend,
+ cdns_uart_resume);
-/* ---------------------------------------------------------------------
- * Platform bus binding
- */
/**
- * xuartps_probe - Platform driver probe
+ * cdns_uart_probe - Platform driver probe
* @pdev: Pointer to the platform device structure
*
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_probe(struct platform_device *pdev)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_probe(struct platform_device *pdev)
{
- int rc;
+ int rc, id;
struct uart_port *port;
struct resource *res, *res2;
- struct xuartps *xuartps_data;
+ struct cdns_uart *cdns_uart_data;
- xuartps_data = devm_kzalloc(&pdev->dev, sizeof(*xuartps_data),
+ cdns_uart_data = devm_kzalloc(&pdev->dev, sizeof(*cdns_uart_data),
GFP_KERNEL);
- if (!xuartps_data)
+ if (!cdns_uart_data)
return -ENOMEM;
- xuartps_data->aperclk = devm_clk_get(&pdev->dev, "aper_clk");
- if (IS_ERR(xuartps_data->aperclk)) {
- dev_err(&pdev->dev, "aper_clk clock not found.\n");
- return PTR_ERR(xuartps_data->aperclk);
+ cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(cdns_uart_data->pclk)) {
+ cdns_uart_data->pclk = devm_clk_get(&pdev->dev, "aper_clk");
+ if (!IS_ERR(cdns_uart_data->pclk))
+ dev_err(&pdev->dev, "clock name 'aper_clk' is deprecated.\n");
}
- xuartps_data->refclk = devm_clk_get(&pdev->dev, "ref_clk");
- if (IS_ERR(xuartps_data->refclk)) {
- dev_err(&pdev->dev, "ref_clk clock not found.\n");
- return PTR_ERR(xuartps_data->refclk);
+ if (IS_ERR(cdns_uart_data->pclk)) {
+ dev_err(&pdev->dev, "pclk clock not found.\n");
+ return PTR_ERR(cdns_uart_data->pclk);
}
- rc = clk_prepare_enable(xuartps_data->aperclk);
+ cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "uart_clk");
+ if (IS_ERR(cdns_uart_data->uartclk)) {
+ cdns_uart_data->uartclk = devm_clk_get(&pdev->dev, "ref_clk");
+ if (!IS_ERR(cdns_uart_data->uartclk))
+ dev_err(&pdev->dev, "clock name 'ref_clk' is deprecated.\n");
+ }
+ if (IS_ERR(cdns_uart_data->uartclk)) {
+ dev_err(&pdev->dev, "uart_clk clock not found.\n");
+ return PTR_ERR(cdns_uart_data->uartclk);
+ }
+
+ rc = clk_prepare_enable(cdns_uart_data->pclk);
if (rc) {
- dev_err(&pdev->dev, "Unable to enable APER clock.\n");
+ dev_err(&pdev->dev, "Unable to enable pclk clock.\n");
return rc;
}
- rc = clk_prepare_enable(xuartps_data->refclk);
+ rc = clk_prepare_enable(cdns_uart_data->uartclk);
if (rc) {
dev_err(&pdev->dev, "Unable to enable device clock.\n");
- goto err_out_clk_dis_aper;
+ goto err_out_clk_dis_pclk;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -1385,15 +1346,19 @@
}
#ifdef CONFIG_COMMON_CLK
- xuartps_data->clk_rate_change_nb.notifier_call =
- xuartps_clk_notifier_cb;
- if (clk_notifier_register(xuartps_data->refclk,
- &xuartps_data->clk_rate_change_nb))
+ cdns_uart_data->clk_rate_change_nb.notifier_call =
+ cdns_uart_clk_notifier_cb;
+ if (clk_notifier_register(cdns_uart_data->uartclk,
+ &cdns_uart_data->clk_rate_change_nb))
dev_warn(&pdev->dev, "Unable to register clock notifier.\n");
#endif
+ /* Look for a serialN alias */
+ id = of_alias_get_id(pdev->dev.of_node, "serial");
+ if (id < 0)
+ id = 0;
/* Initialize the port structure */
- port = xuartps_get_port();
+ port = cdns_uart_get_port(id);
if (!port) {
dev_err(&pdev->dev, "Cannot get uart_port structure\n");
@@ -1407,11 +1372,11 @@
port->mapbase = res->start;
port->irq = res2->start;
port->dev = &pdev->dev;
- port->uartclk = clk_get_rate(xuartps_data->refclk);
- port->private_data = xuartps_data;
- xuartps_data->port = port;
+ port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
+ port->private_data = cdns_uart_data;
+ cdns_uart_data->port = port;
platform_set_drvdata(pdev, port);
- rc = uart_add_one_port(&xuartps_uart_driver, port);
+ rc = uart_add_one_port(&cdns_uart_uart_driver, port);
if (rc) {
dev_err(&pdev->dev,
"uart_add_one_port() failed; err=%i\n", rc);
@@ -1422,103 +1387,89 @@
err_out_notif_unreg:
#ifdef CONFIG_COMMON_CLK
- clk_notifier_unregister(xuartps_data->refclk,
- &xuartps_data->clk_rate_change_nb);
+ clk_notifier_unregister(cdns_uart_data->uartclk,
+ &cdns_uart_data->clk_rate_change_nb);
#endif
err_out_clk_disable:
- clk_disable_unprepare(xuartps_data->refclk);
-err_out_clk_dis_aper:
- clk_disable_unprepare(xuartps_data->aperclk);
+ clk_disable_unprepare(cdns_uart_data->uartclk);
+err_out_clk_dis_pclk:
+ clk_disable_unprepare(cdns_uart_data->pclk);
return rc;
}
/**
- * xuartps_remove - called when the platform driver is unregistered
+ * cdns_uart_remove - called when the platform driver is unregistered
* @pdev: Pointer to the platform device structure
*
- * Returns 0 on success, negative error otherwise
- **/
-static int xuartps_remove(struct platform_device *pdev)
+ * Return: 0 on success, negative errno otherwise
+ */
+static int cdns_uart_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
- struct xuartps *xuartps_data = port->private_data;
+ struct cdns_uart *cdns_uart_data = port->private_data;
int rc;
- /* Remove the xuartps port from the serial core */
+ /* Remove the cdns_uart port from the serial core */
#ifdef CONFIG_COMMON_CLK
- clk_notifier_unregister(xuartps_data->refclk,
- &xuartps_data->clk_rate_change_nb);
+ clk_notifier_unregister(cdns_uart_data->uartclk,
+ &cdns_uart_data->clk_rate_change_nb);
#endif
- rc = uart_remove_one_port(&xuartps_uart_driver, port);
+ rc = uart_remove_one_port(&cdns_uart_uart_driver, port);
port->mapbase = 0;
- clk_disable_unprepare(xuartps_data->refclk);
- clk_disable_unprepare(xuartps_data->aperclk);
+ clk_disable_unprepare(cdns_uart_data->uartclk);
+ clk_disable_unprepare(cdns_uart_data->pclk);
return rc;
}
/* Match table for of_platform binding */
-static struct of_device_id xuartps_of_match[] = {
+static struct of_device_id cdns_uart_of_match[] = {
{ .compatible = "xlnx,xuartps", },
+ { .compatible = "cdns,uart-r1p8", },
{}
};
-MODULE_DEVICE_TABLE(of, xuartps_of_match);
+MODULE_DEVICE_TABLE(of, cdns_uart_of_match);
-static struct platform_driver xuartps_platform_driver = {
- .probe = xuartps_probe, /* Probe method */
- .remove = xuartps_remove, /* Detach method */
+static struct platform_driver cdns_uart_platform_driver = {
+ .probe = cdns_uart_probe,
+ .remove = cdns_uart_remove,
.driver = {
.owner = THIS_MODULE,
- .name = XUARTPS_NAME, /* Driver name */
- .of_match_table = xuartps_of_match,
- .pm = &xuartps_dev_pm_ops,
+ .name = CDNS_UART_NAME,
+ .of_match_table = cdns_uart_of_match,
+ .pm = &cdns_uart_dev_pm_ops,
},
};
-/* ---------------------------------------------------------------------
- * Module Init and Exit
- */
-/**
- * xuartps_init - Initial driver registration call
- *
- * Returns whether the registration was successful or not
- **/
-static int __init xuartps_init(void)
+static int __init cdns_uart_init(void)
{
int retval = 0;
- /* Register the xuartps driver with the serial core */
- retval = uart_register_driver(&xuartps_uart_driver);
+ /* Register the cdns_uart driver with the serial core */
+ retval = uart_register_driver(&cdns_uart_uart_driver);
if (retval)
return retval;
/* Register the platform driver */
- retval = platform_driver_register(&xuartps_platform_driver);
+ retval = platform_driver_register(&cdns_uart_platform_driver);
if (retval)
- uart_unregister_driver(&xuartps_uart_driver);
+ uart_unregister_driver(&cdns_uart_uart_driver);
return retval;
}
-/**
- * xuartps_exit - Driver unregistration call
- **/
-static void __exit xuartps_exit(void)
+static void __exit cdns_uart_exit(void)
{
- /* The order of unregistration is important. Unregister the
- * UART driver before the platform driver crashes the system.
- */
-
/* Unregister the platform driver */
- platform_driver_unregister(&xuartps_platform_driver);
+ platform_driver_unregister(&cdns_uart_platform_driver);
- /* Unregister the xuartps driver */
- uart_unregister_driver(&xuartps_uart_driver);
+ /* Unregister the cdns_uart driver */
+ uart_unregister_driver(&cdns_uart_uart_driver);
}
-module_init(xuartps_init);
-module_exit(xuartps_exit);
+module_init(cdns_uart_init);
+module_exit(cdns_uart_exit);
-MODULE_DESCRIPTION("Driver for PS UART");
+MODULE_DESCRIPTION("Driver for Cadence UART");
MODULE_AUTHOR("Xilinx Inc.");
MODULE_LICENSE("GPL");
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index f729be9..7a15b5b 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -285,6 +285,22 @@
/*
* Console helpers.
*/
+struct earlycon_device {
+ struct console *con;
+ struct uart_port port;
+ char options[16]; /* e.g., 115200n8 */
+ unsigned int baud;
+};
+int setup_earlycon(char *buf, const char *match,
+ int (*setup)(struct earlycon_device *, const char *));
+
+#define EARLYCON_DECLARE(name, func) \
+static int __init name ## _setup_earlycon(char *buf) \
+{ \
+ return setup_earlycon(buf, __stringify(name), func); \
+} \
+early_param("earlycon", name ## _setup_earlycon);
+
struct uart_port *uart_get_console(struct uart_port *ports, int nr,
struct console *c);
void uart_parse_options(char *options, int *baud, int *parity, int *bits,
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index add26da..00c9d68 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -92,7 +92,10 @@
* This function is called by the low-level tty driver to signal
* that line discpline should try to send more characters to the
* low-level driver for transmission. If the line discpline does
- * not have any more data to send, it can just return.
+ * not have any more data to send, it can just return. If the line
+ * discipline does have some data to send, please arise a tasklet
+ * or workqueue to do the real data transfer. Do not send data in
+ * this hook, it may leads to a deadlock.
*
* int (*hangup)(struct tty_struct *)
*
diff --git a/include/uapi/linux/serial_core.h b/include/uapi/linux/serial_core.h
index b47dba2..5820269 100644
--- a/include/uapi/linux/serial_core.h
+++ b/include/uapi/linux/serial_core.h
@@ -211,7 +211,7 @@
/* VIA VT8500 SoC */
#define PORT_VT8500 97
-/* Xilinx PSS UART */
+/* Cadence (Xilinx Zynq) UART */
#define PORT_XUARTPS 98
/* Atheros AR933X SoC */
@@ -238,4 +238,10 @@
/* Tilera TILE-Gx UART */
#define PORT_TILEGX 106
+/* MEN 16z135 UART */
+#define PORT_MEN_Z135 107
+
+/* SC16IS74xx */
+#define PORT_SC16IS7XX 108
+
#endif /* _UAPILINUX_SERIAL_CORE_H */
diff --git a/include/uapi/linux/serial_reg.h b/include/uapi/linux/serial_reg.h
index e632260..99b4705 100644
--- a/include/uapi/linux/serial_reg.h
+++ b/include/uapi/linux/serial_reg.h
@@ -32,7 +32,7 @@
#define UART_IIR 2 /* In: Interrupt ID Register */
#define UART_IIR_NO_INT 0x01 /* No interrupts pending */
-#define UART_IIR_ID 0x06 /* Mask for the interrupt ID */
+#define UART_IIR_ID 0x0e /* Mask for the interrupt ID */
#define UART_IIR_MSI 0x00 /* Modem status interrupt */
#define UART_IIR_THRI 0x02 /* Transmitter holding register empty */
#define UART_IIR_RDI 0x04 /* Receiver data interrupt */
