| /* |
| * NinjaSCSI-32Bi Cardbus, NinjaSCSI-32UDE PCI/CardBus SCSI driver |
| * Copyright (C) 2001, 2002, 2003 |
| * YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp> |
| * GOTO Masanori <gotom@debian.or.jp>, <gotom@debian.org> |
| * |
| * 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, or (at your option) |
| * any later version. |
| * |
| * 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. |
| * |
| * |
| * Revision History: |
| * 1.0: Initial Release. |
| * 1.1: Add /proc SDTR status. |
| * Remove obsolete error handler nsp32_reset. |
| * Some clean up. |
| * 1.2: PowerPC (big endian) support. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/timer.h> |
| #include <linux/ioport.h> |
| #include <linux/major.h> |
| #include <linux/blkdev.h> |
| #include <linux/interrupt.h> |
| #include <linux/pci.h> |
| #include <linux/delay.h> |
| #include <linux/ctype.h> |
| #include <linux/dma-mapping.h> |
| |
| #include <asm/dma.h> |
| #include <asm/io.h> |
| |
| #include <scsi/scsi.h> |
| #include <scsi/scsi_cmnd.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_host.h> |
| #include <scsi/scsi_ioctl.h> |
| |
| #include "nsp32.h" |
| |
| |
| /*********************************************************************** |
| * Module parameters |
| */ |
| static int trans_mode = 0; /* default: BIOS */ |
| module_param (trans_mode, int, 0); |
| MODULE_PARM_DESC(trans_mode, "transfer mode (0: BIOS(default) 1: Async 2: Ultra20M"); |
| #define ASYNC_MODE 1 |
| #define ULTRA20M_MODE 2 |
| |
| static bool auto_param = 0; /* default: ON */ |
| module_param (auto_param, bool, 0); |
| MODULE_PARM_DESC(auto_param, "AutoParameter mode (0: ON(default) 1: OFF)"); |
| |
| static bool disc_priv = 1; /* default: OFF */ |
| module_param (disc_priv, bool, 0); |
| MODULE_PARM_DESC(disc_priv, "disconnection privilege mode (0: ON 1: OFF(default))"); |
| |
| MODULE_AUTHOR("YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>, GOTO Masanori <gotom@debian.or.jp>"); |
| MODULE_DESCRIPTION("Workbit NinjaSCSI-32Bi/UDE CardBus/PCI SCSI host bus adapter module"); |
| MODULE_LICENSE("GPL"); |
| |
| static const char *nsp32_release_version = "1.2"; |
| |
| |
| /**************************************************************************** |
| * Supported hardware |
| */ |
| static struct pci_device_id nsp32_pci_table[] = { |
| { |
| .vendor = PCI_VENDOR_ID_IODATA, |
| .device = PCI_DEVICE_ID_NINJASCSI_32BI_CBSC_II, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_IODATA, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32BI_KME, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_KME, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32BI_WBT, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_WORKBIT, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_WORKBIT_STANDARD, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_PCI_WORKBIT, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32BI_LOGITEC, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_LOGITEC, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_PCI_LOGITEC, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_PCI_MELCO, |
| }, |
| { |
| .vendor = PCI_VENDOR_ID_WORKBIT, |
| .device = PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO_II, |
| .subvendor = PCI_ANY_ID, |
| .subdevice = PCI_ANY_ID, |
| .driver_data = MODEL_PCI_MELCO, |
| }, |
| {0,0,}, |
| }; |
| MODULE_DEVICE_TABLE(pci, nsp32_pci_table); |
| |
| static nsp32_hw_data nsp32_data_base; /* probe <-> detect glue */ |
| |
| |
| /* |
| * Period/AckWidth speed conversion table |
| * |
| * Note: This period/ackwidth speed table must be in descending order. |
| */ |
| static nsp32_sync_table nsp32_sync_table_40M[] = { |
| /* {PNo, AW, SP, EP, SREQ smpl} Speed(MB/s) Period AckWidth */ |
| {0x1, 0, 0x0c, 0x0c, SMPL_40M}, /* 20.0 : 50ns, 25ns */ |
| {0x2, 0, 0x0d, 0x18, SMPL_40M}, /* 13.3 : 75ns, 25ns */ |
| {0x3, 1, 0x19, 0x19, SMPL_40M}, /* 10.0 : 100ns, 50ns */ |
| {0x4, 1, 0x1a, 0x1f, SMPL_20M}, /* 8.0 : 125ns, 50ns */ |
| {0x5, 2, 0x20, 0x25, SMPL_20M}, /* 6.7 : 150ns, 75ns */ |
| {0x6, 2, 0x26, 0x31, SMPL_20M}, /* 5.7 : 175ns, 75ns */ |
| {0x7, 3, 0x32, 0x32, SMPL_20M}, /* 5.0 : 200ns, 100ns */ |
| {0x8, 3, 0x33, 0x38, SMPL_10M}, /* 4.4 : 225ns, 100ns */ |
| {0x9, 3, 0x39, 0x3e, SMPL_10M}, /* 4.0 : 250ns, 100ns */ |
| }; |
| |
| static nsp32_sync_table nsp32_sync_table_20M[] = { |
| {0x1, 0, 0x19, 0x19, SMPL_40M}, /* 10.0 : 100ns, 50ns */ |
| {0x2, 0, 0x1a, 0x25, SMPL_20M}, /* 6.7 : 150ns, 50ns */ |
| {0x3, 1, 0x26, 0x32, SMPL_20M}, /* 5.0 : 200ns, 100ns */ |
| {0x4, 1, 0x33, 0x3e, SMPL_10M}, /* 4.0 : 250ns, 100ns */ |
| {0x5, 2, 0x3f, 0x4b, SMPL_10M}, /* 3.3 : 300ns, 150ns */ |
| {0x6, 2, 0x4c, 0x57, SMPL_10M}, /* 2.8 : 350ns, 150ns */ |
| {0x7, 3, 0x58, 0x64, SMPL_10M}, /* 2.5 : 400ns, 200ns */ |
| {0x8, 3, 0x65, 0x70, SMPL_10M}, /* 2.2 : 450ns, 200ns */ |
| {0x9, 3, 0x71, 0x7d, SMPL_10M}, /* 2.0 : 500ns, 200ns */ |
| }; |
| |
| static nsp32_sync_table nsp32_sync_table_pci[] = { |
| {0x1, 0, 0x0c, 0x0f, SMPL_40M}, /* 16.6 : 60ns, 30ns */ |
| {0x2, 0, 0x10, 0x16, SMPL_40M}, /* 11.1 : 90ns, 30ns */ |
| {0x3, 1, 0x17, 0x1e, SMPL_20M}, /* 8.3 : 120ns, 60ns */ |
| {0x4, 1, 0x1f, 0x25, SMPL_20M}, /* 6.7 : 150ns, 60ns */ |
| {0x5, 2, 0x26, 0x2d, SMPL_20M}, /* 5.6 : 180ns, 90ns */ |
| {0x6, 2, 0x2e, 0x34, SMPL_10M}, /* 4.8 : 210ns, 90ns */ |
| {0x7, 3, 0x35, 0x3c, SMPL_10M}, /* 4.2 : 240ns, 120ns */ |
| {0x8, 3, 0x3d, 0x43, SMPL_10M}, /* 3.7 : 270ns, 120ns */ |
| {0x9, 3, 0x44, 0x4b, SMPL_10M}, /* 3.3 : 300ns, 120ns */ |
| }; |
| |
| /* |
| * function declaration |
| */ |
| /* module entry point */ |
| static int nsp32_probe (struct pci_dev *, const struct pci_device_id *); |
| static void nsp32_remove(struct pci_dev *); |
| static int __init init_nsp32 (void); |
| static void __exit exit_nsp32 (void); |
| |
| /* struct struct scsi_host_template */ |
| static int nsp32_show_info (struct seq_file *, struct Scsi_Host *); |
| |
| static int nsp32_detect (struct pci_dev *pdev); |
| static int nsp32_queuecommand(struct Scsi_Host *, struct scsi_cmnd *); |
| static const char *nsp32_info (struct Scsi_Host *); |
| static int nsp32_release (struct Scsi_Host *); |
| |
| /* SCSI error handler */ |
| static int nsp32_eh_abort (struct scsi_cmnd *); |
| static int nsp32_eh_bus_reset (struct scsi_cmnd *); |
| static int nsp32_eh_host_reset(struct scsi_cmnd *); |
| |
| /* generate SCSI message */ |
| static void nsp32_build_identify(struct scsi_cmnd *); |
| static void nsp32_build_nop (struct scsi_cmnd *); |
| static void nsp32_build_reject (struct scsi_cmnd *); |
| static void nsp32_build_sdtr (struct scsi_cmnd *, unsigned char, unsigned char); |
| |
| /* SCSI message handler */ |
| static int nsp32_busfree_occur(struct scsi_cmnd *, unsigned short); |
| static void nsp32_msgout_occur (struct scsi_cmnd *); |
| static void nsp32_msgin_occur (struct scsi_cmnd *, unsigned long, unsigned short); |
| |
| static int nsp32_setup_sg_table (struct scsi_cmnd *); |
| static int nsp32_selection_autopara(struct scsi_cmnd *); |
| static int nsp32_selection_autoscsi(struct scsi_cmnd *); |
| static void nsp32_scsi_done (struct scsi_cmnd *); |
| static int nsp32_arbitration (struct scsi_cmnd *, unsigned int); |
| static int nsp32_reselection (struct scsi_cmnd *, unsigned char); |
| static void nsp32_adjust_busfree (struct scsi_cmnd *, unsigned int); |
| static void nsp32_restart_autoscsi (struct scsi_cmnd *, unsigned short); |
| |
| /* SCSI SDTR */ |
| static void nsp32_analyze_sdtr (struct scsi_cmnd *); |
| static int nsp32_search_period_entry(nsp32_hw_data *, nsp32_target *, unsigned char); |
| static void nsp32_set_async (nsp32_hw_data *, nsp32_target *); |
| static void nsp32_set_max_sync (nsp32_hw_data *, nsp32_target *, unsigned char *, unsigned char *); |
| static void nsp32_set_sync_entry (nsp32_hw_data *, nsp32_target *, int, unsigned char); |
| |
| /* SCSI bus status handler */ |
| static void nsp32_wait_req (nsp32_hw_data *, int); |
| static void nsp32_wait_sack (nsp32_hw_data *, int); |
| static void nsp32_sack_assert (nsp32_hw_data *); |
| static void nsp32_sack_negate (nsp32_hw_data *); |
| static void nsp32_do_bus_reset(nsp32_hw_data *); |
| |
| /* hardware interrupt handler */ |
| static irqreturn_t do_nsp32_isr(int, void *); |
| |
| /* initialize hardware */ |
| static int nsp32hw_init(nsp32_hw_data *); |
| |
| /* EEPROM handler */ |
| static int nsp32_getprom_param (nsp32_hw_data *); |
| static int nsp32_getprom_at24 (nsp32_hw_data *); |
| static int nsp32_getprom_c16 (nsp32_hw_data *); |
| static void nsp32_prom_start (nsp32_hw_data *); |
| static void nsp32_prom_stop (nsp32_hw_data *); |
| static int nsp32_prom_read (nsp32_hw_data *, int); |
| static int nsp32_prom_read_bit (nsp32_hw_data *); |
| static void nsp32_prom_write_bit(nsp32_hw_data *, int); |
| static void nsp32_prom_set (nsp32_hw_data *, int, int); |
| static int nsp32_prom_get (nsp32_hw_data *, int); |
| |
| /* debug/warning/info message */ |
| static void nsp32_message (const char *, int, char *, char *, ...); |
| #ifdef NSP32_DEBUG |
| static void nsp32_dmessage(const char *, int, int, char *, ...); |
| #endif |
| |
| /* |
| * max_sectors is currently limited up to 128. |
| */ |
| static struct scsi_host_template nsp32_template = { |
| .proc_name = "nsp32", |
| .name = "Workbit NinjaSCSI-32Bi/UDE", |
| .show_info = nsp32_show_info, |
| .info = nsp32_info, |
| .queuecommand = nsp32_queuecommand, |
| .can_queue = 1, |
| .sg_tablesize = NSP32_SG_SIZE, |
| .max_sectors = 128, |
| .this_id = NSP32_HOST_SCSIID, |
| .use_clustering = DISABLE_CLUSTERING, |
| .eh_abort_handler = nsp32_eh_abort, |
| .eh_bus_reset_handler = nsp32_eh_bus_reset, |
| .eh_host_reset_handler = nsp32_eh_host_reset, |
| /* .highmem_io = 1, */ |
| }; |
| |
| #include "nsp32_io.h" |
| |
| /*********************************************************************** |
| * debug, error print |
| */ |
| #ifndef NSP32_DEBUG |
| # define NSP32_DEBUG_MASK 0x000000 |
| # define nsp32_msg(type, args...) nsp32_message ("", 0, (type), args) |
| # define nsp32_dbg(mask, args...) /* */ |
| #else |
| # define NSP32_DEBUG_MASK 0xffffff |
| # define nsp32_msg(type, args...) \ |
| nsp32_message (__func__, __LINE__, (type), args) |
| # define nsp32_dbg(mask, args...) \ |
| nsp32_dmessage(__func__, __LINE__, (mask), args) |
| #endif |
| |
| #define NSP32_DEBUG_QUEUECOMMAND BIT(0) |
| #define NSP32_DEBUG_REGISTER BIT(1) |
| #define NSP32_DEBUG_AUTOSCSI BIT(2) |
| #define NSP32_DEBUG_INTR BIT(3) |
| #define NSP32_DEBUG_SGLIST BIT(4) |
| #define NSP32_DEBUG_BUSFREE BIT(5) |
| #define NSP32_DEBUG_CDB_CONTENTS BIT(6) |
| #define NSP32_DEBUG_RESELECTION BIT(7) |
| #define NSP32_DEBUG_MSGINOCCUR BIT(8) |
| #define NSP32_DEBUG_EEPROM BIT(9) |
| #define NSP32_DEBUG_MSGOUTOCCUR BIT(10) |
| #define NSP32_DEBUG_BUSRESET BIT(11) |
| #define NSP32_DEBUG_RESTART BIT(12) |
| #define NSP32_DEBUG_SYNC BIT(13) |
| #define NSP32_DEBUG_WAIT BIT(14) |
| #define NSP32_DEBUG_TARGETFLAG BIT(15) |
| #define NSP32_DEBUG_PROC BIT(16) |
| #define NSP32_DEBUG_INIT BIT(17) |
| #define NSP32_SPECIAL_PRINT_REGISTER BIT(20) |
| |
| #define NSP32_DEBUG_BUF_LEN 100 |
| |
| static void nsp32_message(const char *func, int line, char *type, char *fmt, ...) |
| { |
| va_list args; |
| char buf[NSP32_DEBUG_BUF_LEN]; |
| |
| va_start(args, fmt); |
| vsnprintf(buf, sizeof(buf), fmt, args); |
| va_end(args); |
| |
| #ifndef NSP32_DEBUG |
| printk("%snsp32: %s\n", type, buf); |
| #else |
| printk("%snsp32: %s (%d): %s\n", type, func, line, buf); |
| #endif |
| } |
| |
| #ifdef NSP32_DEBUG |
| static void nsp32_dmessage(const char *func, int line, int mask, char *fmt, ...) |
| { |
| va_list args; |
| char buf[NSP32_DEBUG_BUF_LEN]; |
| |
| va_start(args, fmt); |
| vsnprintf(buf, sizeof(buf), fmt, args); |
| va_end(args); |
| |
| if (mask & NSP32_DEBUG_MASK) { |
| printk("nsp32-debug: 0x%x %s (%d): %s\n", mask, func, line, buf); |
| } |
| } |
| #endif |
| |
| #ifdef NSP32_DEBUG |
| # include "nsp32_debug.c" |
| #else |
| # define show_command(arg) /* */ |
| # define show_busphase(arg) /* */ |
| # define show_autophase(arg) /* */ |
| #endif |
| |
| /* |
| * IDENTIFY Message |
| */ |
| static void nsp32_build_identify(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| int pos = data->msgout_len; |
| int mode = FALSE; |
| |
| /* XXX: Auto DiscPriv detection is progressing... */ |
| if (disc_priv == 0) { |
| /* mode = TRUE; */ |
| } |
| |
| data->msgoutbuf[pos] = IDENTIFY(mode, SCpnt->device->lun); pos++; |
| |
| data->msgout_len = pos; |
| } |
| |
| /* |
| * SDTR Message Routine |
| */ |
| static void nsp32_build_sdtr(struct scsi_cmnd *SCpnt, |
| unsigned char period, |
| unsigned char offset) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| int pos = data->msgout_len; |
| |
| data->msgoutbuf[pos] = EXTENDED_MESSAGE; pos++; |
| data->msgoutbuf[pos] = EXTENDED_SDTR_LEN; pos++; |
| data->msgoutbuf[pos] = EXTENDED_SDTR; pos++; |
| data->msgoutbuf[pos] = period; pos++; |
| data->msgoutbuf[pos] = offset; pos++; |
| |
| data->msgout_len = pos; |
| } |
| |
| /* |
| * No Operation Message |
| */ |
| static void nsp32_build_nop(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| int pos = data->msgout_len; |
| |
| if (pos != 0) { |
| nsp32_msg(KERN_WARNING, |
| "Some messages are already contained!"); |
| return; |
| } |
| |
| data->msgoutbuf[pos] = NOP; pos++; |
| data->msgout_len = pos; |
| } |
| |
| /* |
| * Reject Message |
| */ |
| static void nsp32_build_reject(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| int pos = data->msgout_len; |
| |
| data->msgoutbuf[pos] = MESSAGE_REJECT; pos++; |
| data->msgout_len = pos; |
| } |
| |
| /* |
| * timer |
| */ |
| #if 0 |
| static void nsp32_start_timer(struct scsi_cmnd *SCpnt, int time) |
| { |
| unsigned int base = SCpnt->host->io_port; |
| |
| nsp32_dbg(NSP32_DEBUG_INTR, "timer=%d", time); |
| |
| if (time & (~TIMER_CNT_MASK)) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "timer set overflow"); |
| } |
| |
| nsp32_write2(base, TIMER_SET, time & TIMER_CNT_MASK); |
| } |
| #endif |
| |
| |
| /* |
| * set SCSI command and other parameter to asic, and start selection phase |
| */ |
| static int nsp32_selection_autopara(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| unsigned int host_id = SCpnt->device->host->this_id; |
| unsigned char target = scmd_id(SCpnt); |
| nsp32_autoparam *param = data->autoparam; |
| unsigned char phase; |
| int i, ret; |
| unsigned int msgout; |
| u16_le s; |
| |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in"); |
| |
| /* |
| * check bus free |
| */ |
| phase = nsp32_read1(base, SCSI_BUS_MONITOR); |
| if (phase != BUSMON_BUS_FREE) { |
| nsp32_msg(KERN_WARNING, "bus busy"); |
| show_busphase(phase & BUSMON_PHASE_MASK); |
| SCpnt->result = DID_BUS_BUSY << 16; |
| return FALSE; |
| } |
| |
| /* |
| * message out |
| * |
| * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout. |
| * over 3 messages needs another routine. |
| */ |
| if (data->msgout_len == 0) { |
| nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!"); |
| SCpnt->result = DID_ERROR << 16; |
| return FALSE; |
| } else if (data->msgout_len > 0 && data->msgout_len <= 3) { |
| msgout = 0; |
| for (i = 0; i < data->msgout_len; i++) { |
| /* |
| * the sending order of the message is: |
| * MCNT 3: MSG#0 -> MSG#1 -> MSG#2 |
| * MCNT 2: MSG#1 -> MSG#2 |
| * MCNT 1: MSG#2 |
| */ |
| msgout >>= 8; |
| msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24); |
| } |
| msgout |= MV_VALID; /* MV valid */ |
| msgout |= (unsigned int)data->msgout_len; /* len */ |
| } else { |
| /* data->msgout_len > 3 */ |
| msgout = 0; |
| } |
| |
| // nsp_dbg(NSP32_DEBUG_AUTOSCSI, "sel time out=0x%x\n", nsp32_read2(base, SEL_TIME_OUT)); |
| // nsp32_write2(base, SEL_TIME_OUT, SEL_TIMEOUT_TIME); |
| |
| /* |
| * setup asic parameter |
| */ |
| memset(param, 0, sizeof(nsp32_autoparam)); |
| |
| /* cdb */ |
| for (i = 0; i < SCpnt->cmd_len; i++) { |
| param->cdb[4 * i] = SCpnt->cmnd[i]; |
| } |
| |
| /* outgoing messages */ |
| param->msgout = cpu_to_le32(msgout); |
| |
| /* syncreg, ackwidth, target id, SREQ sampling rate */ |
| param->syncreg = data->cur_target->syncreg; |
| param->ackwidth = data->cur_target->ackwidth; |
| param->target_id = BIT(host_id) | BIT(target); |
| param->sample_reg = data->cur_target->sample_reg; |
| |
| // nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "sample rate=0x%x\n", data->cur_target->sample_reg); |
| |
| /* command control */ |
| param->command_control = cpu_to_le16(CLEAR_CDB_FIFO_POINTER | |
| AUTOSCSI_START | |
| AUTO_MSGIN_00_OR_04 | |
| AUTO_MSGIN_02 | |
| AUTO_ATN ); |
| |
| |
| /* transfer control */ |
| s = 0; |
| switch (data->trans_method) { |
| case NSP32_TRANSFER_BUSMASTER: |
| s |= BM_START; |
| break; |
| case NSP32_TRANSFER_MMIO: |
| s |= CB_MMIO_MODE; |
| break; |
| case NSP32_TRANSFER_PIO: |
| s |= CB_IO_MODE; |
| break; |
| default: |
| nsp32_msg(KERN_ERR, "unknown trans_method"); |
| break; |
| } |
| /* |
| * OR-ed BLIEND_MODE, FIFO intr is decreased, instead of PCI bus waits. |
| * For bus master transfer, it's taken off. |
| */ |
| s |= (TRANSFER_GO | ALL_COUNTER_CLR); |
| param->transfer_control = cpu_to_le16(s); |
| |
| /* sg table addr */ |
| param->sgt_pointer = cpu_to_le32(data->cur_lunt->sglun_paddr); |
| |
| /* |
| * transfer parameter to ASIC |
| */ |
| nsp32_write4(base, SGT_ADR, data->auto_paddr); |
| nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER | |
| AUTO_PARAMETER ); |
| |
| /* |
| * Check arbitration |
| */ |
| ret = nsp32_arbitration(SCpnt, base); |
| |
| return ret; |
| } |
| |
| |
| /* |
| * Selection with AUTO SCSI (without AUTO PARAMETER) |
| */ |
| static int nsp32_selection_autoscsi(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| unsigned int host_id = SCpnt->device->host->this_id; |
| unsigned char target = scmd_id(SCpnt); |
| unsigned char phase; |
| int status; |
| unsigned short command = 0; |
| unsigned int msgout = 0; |
| unsigned short execph; |
| int i; |
| |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "in"); |
| |
| /* |
| * IRQ disable |
| */ |
| nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK); |
| |
| /* |
| * check bus line |
| */ |
| phase = nsp32_read1(base, SCSI_BUS_MONITOR); |
| if(((phase & BUSMON_BSY) == 1) || (phase & BUSMON_SEL) == 1) { |
| nsp32_msg(KERN_WARNING, "bus busy"); |
| SCpnt->result = DID_BUS_BUSY << 16; |
| status = 1; |
| goto out; |
| } |
| |
| /* |
| * clear execph |
| */ |
| execph = nsp32_read2(base, SCSI_EXECUTE_PHASE); |
| |
| /* |
| * clear FIFO counter to set CDBs |
| */ |
| nsp32_write2(base, COMMAND_CONTROL, CLEAR_CDB_FIFO_POINTER); |
| |
| /* |
| * set CDB0 - CDB15 |
| */ |
| for (i = 0; i < SCpnt->cmd_len; i++) { |
| nsp32_write1(base, COMMAND_DATA, SCpnt->cmnd[i]); |
| } |
| nsp32_dbg(NSP32_DEBUG_CDB_CONTENTS, "CDB[0]=[0x%x]", SCpnt->cmnd[0]); |
| |
| /* |
| * set SCSIOUT LATCH(initiator)/TARGET(target) (OR-ed) ID |
| */ |
| nsp32_write1(base, SCSI_OUT_LATCH_TARGET_ID, BIT(host_id) | BIT(target)); |
| |
| /* |
| * set SCSI MSGOUT REG |
| * |
| * Note: If the range of msgout_len is 1 - 3, fill scsi_msgout. |
| * over 3 messages needs another routine. |
| */ |
| if (data->msgout_len == 0) { |
| nsp32_msg(KERN_ERR, "SCSI MsgOut without any message!"); |
| SCpnt->result = DID_ERROR << 16; |
| status = 1; |
| goto out; |
| } else if (data->msgout_len > 0 && data->msgout_len <= 3) { |
| msgout = 0; |
| for (i = 0; i < data->msgout_len; i++) { |
| /* |
| * the sending order of the message is: |
| * MCNT 3: MSG#0 -> MSG#1 -> MSG#2 |
| * MCNT 2: MSG#1 -> MSG#2 |
| * MCNT 1: MSG#2 |
| */ |
| msgout >>= 8; |
| msgout |= ((unsigned int)(data->msgoutbuf[i]) << 24); |
| } |
| msgout |= MV_VALID; /* MV valid */ |
| msgout |= (unsigned int)data->msgout_len; /* len */ |
| nsp32_write4(base, SCSI_MSG_OUT, msgout); |
| } else { |
| /* data->msgout_len > 3 */ |
| nsp32_write4(base, SCSI_MSG_OUT, 0); |
| } |
| |
| /* |
| * set selection timeout(= 250ms) |
| */ |
| nsp32_write2(base, SEL_TIME_OUT, SEL_TIMEOUT_TIME); |
| |
| /* |
| * set SREQ hazard killer sampling rate |
| * |
| * TODO: sample_rate (BASE+0F) is 0 when internal clock = 40MHz. |
| * check other internal clock! |
| */ |
| nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg); |
| |
| /* |
| * clear Arbit |
| */ |
| nsp32_write1(base, SET_ARBIT, ARBIT_CLEAR); |
| |
| /* |
| * set SYNCREG |
| * Don't set BM_START_ADR before setting this register. |
| */ |
| nsp32_write1(base, SYNC_REG, data->cur_target->syncreg); |
| |
| /* |
| * set ACKWIDTH |
| */ |
| nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth); |
| |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, |
| "syncreg=0x%x, ackwidth=0x%x, sgtpaddr=0x%x, id=0x%x", |
| nsp32_read1(base, SYNC_REG), nsp32_read1(base, ACK_WIDTH), |
| nsp32_read4(base, SGT_ADR), nsp32_read1(base, SCSI_OUT_LATCH_TARGET_ID)); |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "msgout_len=%d, msgout=0x%x", |
| data->msgout_len, msgout); |
| |
| /* |
| * set SGT ADDR (physical address) |
| */ |
| nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr); |
| |
| /* |
| * set TRANSFER CONTROL REG |
| */ |
| command = 0; |
| command |= (TRANSFER_GO | ALL_COUNTER_CLR); |
| if (data->trans_method & NSP32_TRANSFER_BUSMASTER) { |
| if (scsi_bufflen(SCpnt) > 0) { |
| command |= BM_START; |
| } |
| } else if (data->trans_method & NSP32_TRANSFER_MMIO) { |
| command |= CB_MMIO_MODE; |
| } else if (data->trans_method & NSP32_TRANSFER_PIO) { |
| command |= CB_IO_MODE; |
| } |
| nsp32_write2(base, TRANSFER_CONTROL, command); |
| |
| /* |
| * start AUTO SCSI, kick off arbitration |
| */ |
| command = (CLEAR_CDB_FIFO_POINTER | |
| AUTOSCSI_START | |
| AUTO_MSGIN_00_OR_04 | |
| AUTO_MSGIN_02 | |
| AUTO_ATN ); |
| nsp32_write2(base, COMMAND_CONTROL, command); |
| |
| /* |
| * Check arbitration |
| */ |
| status = nsp32_arbitration(SCpnt, base); |
| |
| out: |
| /* |
| * IRQ enable |
| */ |
| nsp32_write2(base, IRQ_CONTROL, 0); |
| |
| return status; |
| } |
| |
| |
| /* |
| * Arbitration Status Check |
| * |
| * Note: Arbitration counter is waited during ARBIT_GO is not lifting. |
| * Using udelay(1) consumes CPU time and system time, but |
| * arbitration delay time is defined minimal 2.4us in SCSI |
| * specification, thus udelay works as coarse grained wait timer. |
| */ |
| static int nsp32_arbitration(struct scsi_cmnd *SCpnt, unsigned int base) |
| { |
| unsigned char arbit; |
| int status = TRUE; |
| int time = 0; |
| |
| do { |
| arbit = nsp32_read1(base, ARBIT_STATUS); |
| time++; |
| } while ((arbit & (ARBIT_WIN | ARBIT_FAIL)) == 0 && |
| (time <= ARBIT_TIMEOUT_TIME)); |
| |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, |
| "arbit: 0x%x, delay time: %d", arbit, time); |
| |
| if (arbit & ARBIT_WIN) { |
| /* Arbitration succeeded */ |
| SCpnt->result = DID_OK << 16; |
| nsp32_index_write1(base, EXT_PORT, LED_ON); /* PCI LED on */ |
| } else if (arbit & ARBIT_FAIL) { |
| /* Arbitration failed */ |
| SCpnt->result = DID_BUS_BUSY << 16; |
| status = FALSE; |
| } else { |
| /* |
| * unknown error or ARBIT_GO timeout, |
| * something lock up! guess no connection. |
| */ |
| nsp32_dbg(NSP32_DEBUG_AUTOSCSI, "arbit timeout"); |
| SCpnt->result = DID_NO_CONNECT << 16; |
| status = FALSE; |
| } |
| |
| /* |
| * clear Arbit |
| */ |
| nsp32_write1(base, SET_ARBIT, ARBIT_CLEAR); |
| |
| return status; |
| } |
| |
| |
| /* |
| * reselection |
| * |
| * Note: This reselection routine is called from msgin_occur, |
| * reselection target id&lun must be already set. |
| * SCSI-2 says IDENTIFY implies RESTORE_POINTER operation. |
| */ |
| static int nsp32_reselection(struct scsi_cmnd *SCpnt, unsigned char newlun) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int host_id = SCpnt->device->host->this_id; |
| unsigned int base = SCpnt->device->host->io_port; |
| unsigned char tmpid, newid; |
| |
| nsp32_dbg(NSP32_DEBUG_RESELECTION, "enter"); |
| |
| /* |
| * calculate reselected SCSI ID |
| */ |
| tmpid = nsp32_read1(base, RESELECT_ID); |
| tmpid &= (~BIT(host_id)); |
| newid = 0; |
| while (tmpid) { |
| if (tmpid & 1) { |
| break; |
| } |
| tmpid >>= 1; |
| newid++; |
| } |
| |
| /* |
| * If reselected New ID:LUN is not existed |
| * or current nexus is not existed, unexpected |
| * reselection is occurred. Send reject message. |
| */ |
| if (newid >= ARRAY_SIZE(data->lunt) || newlun >= ARRAY_SIZE(data->lunt[0])) { |
| nsp32_msg(KERN_WARNING, "unknown id/lun"); |
| return FALSE; |
| } else if(data->lunt[newid][newlun].SCpnt == NULL) { |
| nsp32_msg(KERN_WARNING, "no SCSI command is processing"); |
| return FALSE; |
| } |
| |
| data->cur_id = newid; |
| data->cur_lun = newlun; |
| data->cur_target = &(data->target[newid]); |
| data->cur_lunt = &(data->lunt[newid][newlun]); |
| |
| /* reset SACK/SavedACK counter (or ALL clear?) */ |
| nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK); |
| |
| return TRUE; |
| } |
| |
| |
| /* |
| * nsp32_setup_sg_table - build scatter gather list for transfer data |
| * with bus master. |
| * |
| * Note: NinjaSCSI-32Bi/UDE bus master can not transfer over 64KB at a time. |
| */ |
| static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| struct scatterlist *sg; |
| nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt; |
| int num, i; |
| u32_le l; |
| |
| if (sgt == NULL) { |
| nsp32_dbg(NSP32_DEBUG_SGLIST, "SGT == null"); |
| return FALSE; |
| } |
| |
| num = scsi_dma_map(SCpnt); |
| if (!num) |
| return TRUE; |
| else if (num < 0) |
| return FALSE; |
| else { |
| scsi_for_each_sg(SCpnt, sg, num, i) { |
| /* |
| * Build nsp32_sglist, substitute sg dma addresses. |
| */ |
| sgt[i].addr = cpu_to_le32(sg_dma_address(sg)); |
| sgt[i].len = cpu_to_le32(sg_dma_len(sg)); |
| |
| if (le32_to_cpu(sgt[i].len) > 0x10000) { |
| nsp32_msg(KERN_ERR, |
| "can't transfer over 64KB at a time, size=0x%lx", le32_to_cpu(sgt[i].len)); |
| return FALSE; |
| } |
| nsp32_dbg(NSP32_DEBUG_SGLIST, |
| "num 0x%x : addr 0x%lx len 0x%lx", |
| i, |
| le32_to_cpu(sgt[i].addr), |
| le32_to_cpu(sgt[i].len )); |
| } |
| |
| /* set end mark */ |
| l = le32_to_cpu(sgt[num-1].len); |
| sgt[num-1].len = cpu_to_le32(l | SGTEND); |
| } |
| |
| return TRUE; |
| } |
| |
| static int nsp32_queuecommand_lck(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| nsp32_target *target; |
| nsp32_lunt *cur_lunt; |
| int ret; |
| |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, |
| "enter. target: 0x%x LUN: 0x%llx cmnd: 0x%x cmndlen: 0x%x " |
| "use_sg: 0x%x reqbuf: 0x%lx reqlen: 0x%x", |
| SCpnt->device->id, SCpnt->device->lun, SCpnt->cmnd[0], SCpnt->cmd_len, |
| scsi_sg_count(SCpnt), scsi_sglist(SCpnt), scsi_bufflen(SCpnt)); |
| |
| if (data->CurrentSC != NULL) { |
| nsp32_msg(KERN_ERR, "Currentsc != NULL. Cancel this command request"); |
| data->CurrentSC = NULL; |
| SCpnt->result = DID_NO_CONNECT << 16; |
| done(SCpnt); |
| return 0; |
| } |
| |
| /* check target ID is not same as this initiator ID */ |
| if (scmd_id(SCpnt) == SCpnt->device->host->this_id) { |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "target==host???"); |
| SCpnt->result = DID_BAD_TARGET << 16; |
| done(SCpnt); |
| return 0; |
| } |
| |
| /* check target LUN is allowable value */ |
| if (SCpnt->device->lun >= MAX_LUN) { |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "no more lun"); |
| SCpnt->result = DID_BAD_TARGET << 16; |
| done(SCpnt); |
| return 0; |
| } |
| |
| show_command(SCpnt); |
| |
| SCpnt->scsi_done = done; |
| data->CurrentSC = SCpnt; |
| SCpnt->SCp.Status = CHECK_CONDITION; |
| SCpnt->SCp.Message = 0; |
| scsi_set_resid(SCpnt, scsi_bufflen(SCpnt)); |
| |
| SCpnt->SCp.ptr = (char *)scsi_sglist(SCpnt); |
| SCpnt->SCp.this_residual = scsi_bufflen(SCpnt); |
| SCpnt->SCp.buffer = NULL; |
| SCpnt->SCp.buffers_residual = 0; |
| |
| /* initialize data */ |
| data->msgout_len = 0; |
| data->msgin_len = 0; |
| cur_lunt = &(data->lunt[SCpnt->device->id][SCpnt->device->lun]); |
| cur_lunt->SCpnt = SCpnt; |
| cur_lunt->save_datp = 0; |
| cur_lunt->msgin03 = FALSE; |
| data->cur_lunt = cur_lunt; |
| data->cur_id = SCpnt->device->id; |
| data->cur_lun = SCpnt->device->lun; |
| |
| ret = nsp32_setup_sg_table(SCpnt); |
| if (ret == FALSE) { |
| nsp32_msg(KERN_ERR, "SGT fail"); |
| SCpnt->result = DID_ERROR << 16; |
| nsp32_scsi_done(SCpnt); |
| return 0; |
| } |
| |
| /* Build IDENTIFY */ |
| nsp32_build_identify(SCpnt); |
| |
| /* |
| * If target is the first time to transfer after the reset |
| * (target don't have SDTR_DONE and SDTR_INITIATOR), sync |
| * message SDTR is needed to do synchronous transfer. |
| */ |
| target = &data->target[scmd_id(SCpnt)]; |
| data->cur_target = target; |
| |
| if (!(target->sync_flag & (SDTR_DONE | SDTR_INITIATOR | SDTR_TARGET))) { |
| unsigned char period, offset; |
| |
| if (trans_mode != ASYNC_MODE) { |
| nsp32_set_max_sync(data, target, &period, &offset); |
| nsp32_build_sdtr(SCpnt, period, offset); |
| target->sync_flag |= SDTR_INITIATOR; |
| } else { |
| nsp32_set_async(data, target); |
| target->sync_flag |= SDTR_DONE; |
| } |
| |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, |
| "SDTR: entry: %d start_period: 0x%x offset: 0x%x\n", |
| target->limit_entry, period, offset); |
| } else if (target->sync_flag & SDTR_INITIATOR) { |
| /* |
| * It was negotiating SDTR with target, sending from the |
| * initiator, but there are no chance to remove this flag. |
| * Set async because we don't get proper negotiation. |
| */ |
| nsp32_set_async(data, target); |
| target->sync_flag &= ~SDTR_INITIATOR; |
| target->sync_flag |= SDTR_DONE; |
| |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, |
| "SDTR_INITIATOR: fall back to async"); |
| } else if (target->sync_flag & SDTR_TARGET) { |
| /* |
| * It was negotiating SDTR with target, sending from target, |
| * but there are no chance to remove this flag. Set async |
| * because we don't get proper negotiation. |
| */ |
| nsp32_set_async(data, target); |
| target->sync_flag &= ~SDTR_TARGET; |
| target->sync_flag |= SDTR_DONE; |
| |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, |
| "Unknown SDTR from target is reached, fall back to async."); |
| } |
| |
| nsp32_dbg(NSP32_DEBUG_TARGETFLAG, |
| "target: %d sync_flag: 0x%x syncreg: 0x%x ackwidth: 0x%x", |
| SCpnt->device->id, target->sync_flag, target->syncreg, |
| target->ackwidth); |
| |
| /* Selection */ |
| if (auto_param == 0) { |
| ret = nsp32_selection_autopara(SCpnt); |
| } else { |
| ret = nsp32_selection_autoscsi(SCpnt); |
| } |
| |
| if (ret != TRUE) { |
| nsp32_dbg(NSP32_DEBUG_QUEUECOMMAND, "selection fail"); |
| nsp32_scsi_done(SCpnt); |
| } |
| |
| return 0; |
| } |
| |
| static DEF_SCSI_QCMD(nsp32_queuecommand) |
| |
| /* initialize asic */ |
| static int nsp32hw_init(nsp32_hw_data *data) |
| { |
| unsigned int base = data->BaseAddress; |
| unsigned short irq_stat; |
| unsigned long lc_reg; |
| unsigned char power; |
| |
| lc_reg = nsp32_index_read4(base, CFG_LATE_CACHE); |
| if ((lc_reg & 0xff00) == 0) { |
| lc_reg |= (0x20 << 8); |
| nsp32_index_write2(base, CFG_LATE_CACHE, lc_reg & 0xffff); |
| } |
| |
| nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK); |
| nsp32_write2(base, TRANSFER_CONTROL, 0); |
| nsp32_write4(base, BM_CNT, 0); |
| nsp32_write2(base, SCSI_EXECUTE_PHASE, 0); |
| |
| do { |
| irq_stat = nsp32_read2(base, IRQ_STATUS); |
| nsp32_dbg(NSP32_DEBUG_INIT, "irq_stat 0x%x", irq_stat); |
| } while (irq_stat & IRQSTATUS_ANY_IRQ); |
| |
| /* |
| * Fill FIFO_FULL_SHLD, FIFO_EMPTY_SHLD. Below parameter is |
| * designated by specification. |
| */ |
| if ((data->trans_method & NSP32_TRANSFER_PIO) || |
| (data->trans_method & NSP32_TRANSFER_MMIO)) { |
| nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT, 0x40); |
| nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x40); |
| } else if (data->trans_method & NSP32_TRANSFER_BUSMASTER) { |
| nsp32_index_write1(base, FIFO_FULL_SHLD_COUNT, 0x10); |
| nsp32_index_write1(base, FIFO_EMPTY_SHLD_COUNT, 0x60); |
| } else { |
| nsp32_dbg(NSP32_DEBUG_INIT, "unknown transfer mode"); |
| } |
| |
| nsp32_dbg(NSP32_DEBUG_INIT, "full 0x%x emp 0x%x", |
| nsp32_index_read1(base, FIFO_FULL_SHLD_COUNT), |
| nsp32_index_read1(base, FIFO_EMPTY_SHLD_COUNT)); |
| |
| nsp32_index_write1(base, CLOCK_DIV, data->clock); |
| nsp32_index_write1(base, BM_CYCLE, MEMRD_CMD1 | SGT_AUTO_PARA_MEMED_CMD); |
| nsp32_write1(base, PARITY_CONTROL, 0); /* parity check is disable */ |
| |
| /* |
| * initialize MISC_WRRD register |
| * |
| * Note: Designated parameters is obeyed as following: |
| * MISC_SCSI_DIRECTION_DETECTOR_SELECT: It must be set. |
| * MISC_MASTER_TERMINATION_SELECT: It must be set. |
| * MISC_BMREQ_NEGATE_TIMING_SEL: It should be set. |
| * MISC_AUTOSEL_TIMING_SEL: It should be set. |
| * MISC_BMSTOP_CHANGE2_NONDATA_PHASE: It should be set. |
| * MISC_DELAYED_BMSTART: It's selected for safety. |
| * |
| * Note: If MISC_BMSTOP_CHANGE2_NONDATA_PHASE is set, then |
| * we have to set TRANSFERCONTROL_BM_START as 0 and set |
| * appropriate value before restarting bus master transfer. |
| */ |
| nsp32_index_write2(base, MISC_WR, |
| (SCSI_DIRECTION_DETECTOR_SELECT | |
| DELAYED_BMSTART | |
| MASTER_TERMINATION_SELECT | |
| BMREQ_NEGATE_TIMING_SEL | |
| AUTOSEL_TIMING_SEL | |
| BMSTOP_CHANGE2_NONDATA_PHASE)); |
| |
| nsp32_index_write1(base, TERM_PWR_CONTROL, 0); |
| power = nsp32_index_read1(base, TERM_PWR_CONTROL); |
| if (!(power & SENSE)) { |
| nsp32_msg(KERN_INFO, "term power on"); |
| nsp32_index_write1(base, TERM_PWR_CONTROL, BPWR); |
| } |
| |
| nsp32_write2(base, TIMER_SET, TIMER_STOP); |
| nsp32_write2(base, TIMER_SET, TIMER_STOP); /* Required 2 times */ |
| |
| nsp32_write1(base, SYNC_REG, 0); |
| nsp32_write1(base, ACK_WIDTH, 0); |
| nsp32_write2(base, SEL_TIME_OUT, SEL_TIMEOUT_TIME); |
| |
| /* |
| * enable to select designated IRQ (except for |
| * IRQSELECT_SERR, IRQSELECT_PERR, IRQSELECT_BMCNTERR) |
| */ |
| nsp32_index_write2(base, IRQ_SELECT, IRQSELECT_TIMER_IRQ | |
| IRQSELECT_SCSIRESET_IRQ | |
| IRQSELECT_FIFO_SHLD_IRQ | |
| IRQSELECT_RESELECT_IRQ | |
| IRQSELECT_PHASE_CHANGE_IRQ | |
| IRQSELECT_AUTO_SCSI_SEQ_IRQ | |
| // IRQSELECT_BMCNTERR_IRQ | |
| IRQSELECT_TARGET_ABORT_IRQ | |
| IRQSELECT_MASTER_ABORT_IRQ ); |
| nsp32_write2(base, IRQ_CONTROL, 0); |
| |
| /* PCI LED off */ |
| nsp32_index_write1(base, EXT_PORT_DDR, LED_OFF); |
| nsp32_index_write1(base, EXT_PORT, LED_OFF); |
| |
| return TRUE; |
| } |
| |
| |
| /* interrupt routine */ |
| static irqreturn_t do_nsp32_isr(int irq, void *dev_id) |
| { |
| nsp32_hw_data *data = dev_id; |
| unsigned int base = data->BaseAddress; |
| struct scsi_cmnd *SCpnt = data->CurrentSC; |
| unsigned short auto_stat, irq_stat, trans_stat; |
| unsigned char busmon, busphase; |
| unsigned long flags; |
| int ret; |
| int handled = 0; |
| struct Scsi_Host *host = data->Host; |
| |
| spin_lock_irqsave(host->host_lock, flags); |
| |
| /* |
| * IRQ check, then enable IRQ mask |
| */ |
| irq_stat = nsp32_read2(base, IRQ_STATUS); |
| nsp32_dbg(NSP32_DEBUG_INTR, |
| "enter IRQ: %d, IRQstatus: 0x%x", irq, irq_stat); |
| /* is this interrupt comes from Ninja asic? */ |
| if ((irq_stat & IRQSTATUS_ANY_IRQ) == 0) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "shared interrupt: irq other 0x%x", irq_stat); |
| goto out2; |
| } |
| handled = 1; |
| nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK); |
| |
| busmon = nsp32_read1(base, SCSI_BUS_MONITOR); |
| busphase = busmon & BUSMON_PHASE_MASK; |
| |
| trans_stat = nsp32_read2(base, TRANSFER_STATUS); |
| if ((irq_stat == 0xffff) && (trans_stat == 0xffff)) { |
| nsp32_msg(KERN_INFO, "card disconnect"); |
| if (data->CurrentSC != NULL) { |
| nsp32_msg(KERN_INFO, "clean up current SCSI command"); |
| SCpnt->result = DID_BAD_TARGET << 16; |
| nsp32_scsi_done(SCpnt); |
| } |
| goto out; |
| } |
| |
| /* Timer IRQ */ |
| if (irq_stat & IRQSTATUS_TIMER_IRQ) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "timer stop"); |
| nsp32_write2(base, TIMER_SET, TIMER_STOP); |
| goto out; |
| } |
| |
| /* SCSI reset */ |
| if (irq_stat & IRQSTATUS_SCSIRESET_IRQ) { |
| nsp32_msg(KERN_INFO, "detected someone do bus reset"); |
| nsp32_do_bus_reset(data); |
| if (SCpnt != NULL) { |
| SCpnt->result = DID_RESET << 16; |
| nsp32_scsi_done(SCpnt); |
| } |
| goto out; |
| } |
| |
| if (SCpnt == NULL) { |
| nsp32_msg(KERN_WARNING, "SCpnt==NULL this can't be happened"); |
| nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat); |
| goto out; |
| } |
| |
| /* |
| * AutoSCSI Interrupt. |
| * Note: This interrupt is occurred when AutoSCSI is finished. Then |
| * check SCSIEXECUTEPHASE, and do appropriate action. Each phases are |
| * recorded when AutoSCSI sequencer has been processed. |
| */ |
| if(irq_stat & IRQSTATUS_AUTOSCSI_IRQ) { |
| /* getting SCSI executed phase */ |
| auto_stat = nsp32_read2(base, SCSI_EXECUTE_PHASE); |
| nsp32_write2(base, SCSI_EXECUTE_PHASE, 0); |
| |
| /* Selection Timeout, go busfree phase. */ |
| if (auto_stat & SELECTION_TIMEOUT) { |
| nsp32_dbg(NSP32_DEBUG_INTR, |
| "selection timeout occurred"); |
| |
| SCpnt->result = DID_TIME_OUT << 16; |
| nsp32_scsi_done(SCpnt); |
| goto out; |
| } |
| |
| if (auto_stat & MSGOUT_PHASE) { |
| /* |
| * MsgOut phase was processed. |
| * If MSG_IN_OCCUER is not set, then MsgOut phase is |
| * completed. Thus, msgout_len must reset. Otherwise, |
| * nothing to do here. If MSG_OUT_OCCUER is occurred, |
| * then we will encounter the condition and check. |
| */ |
| if (!(auto_stat & MSG_IN_OCCUER) && |
| (data->msgout_len <= 3)) { |
| /* |
| * !MSG_IN_OCCUER && msgout_len <=3 |
| * ---> AutoSCSI with MSGOUTreg is processed. |
| */ |
| data->msgout_len = 0; |
| }; |
| |
| nsp32_dbg(NSP32_DEBUG_INTR, "MsgOut phase processed"); |
| } |
| |
| if ((auto_stat & DATA_IN_PHASE) && |
| (scsi_get_resid(SCpnt) > 0) && |
| ((nsp32_read2(base, FIFO_REST_CNT) & FIFO_REST_MASK) != 0)) { |
| printk( "auto+fifo\n"); |
| //nsp32_pio_read(SCpnt); |
| } |
| |
| if (auto_stat & (DATA_IN_PHASE | DATA_OUT_PHASE)) { |
| /* DATA_IN_PHASE/DATA_OUT_PHASE was processed. */ |
| nsp32_dbg(NSP32_DEBUG_INTR, |
| "Data in/out phase processed"); |
| |
| /* read BMCNT, SGT pointer addr */ |
| nsp32_dbg(NSP32_DEBUG_INTR, "BMCNT=0x%lx", |
| nsp32_read4(base, BM_CNT)); |
| nsp32_dbg(NSP32_DEBUG_INTR, "addr=0x%lx", |
| nsp32_read4(base, SGT_ADR)); |
| nsp32_dbg(NSP32_DEBUG_INTR, "SACK=0x%lx", |
| nsp32_read4(base, SACK_CNT)); |
| nsp32_dbg(NSP32_DEBUG_INTR, "SSACK=0x%lx", |
| nsp32_read4(base, SAVED_SACK_CNT)); |
| |
| scsi_set_resid(SCpnt, 0); /* all data transferred! */ |
| } |
| |
| /* |
| * MsgIn Occur |
| */ |
| if (auto_stat & MSG_IN_OCCUER) { |
| nsp32_msgin_occur(SCpnt, irq_stat, auto_stat); |
| } |
| |
| /* |
| * MsgOut Occur |
| */ |
| if (auto_stat & MSG_OUT_OCCUER) { |
| nsp32_msgout_occur(SCpnt); |
| } |
| |
| /* |
| * Bus Free Occur |
| */ |
| if (auto_stat & BUS_FREE_OCCUER) { |
| ret = nsp32_busfree_occur(SCpnt, auto_stat); |
| if (ret == TRUE) { |
| goto out; |
| } |
| } |
| |
| if (auto_stat & STATUS_PHASE) { |
| /* |
| * Read CSB and substitute CSB for SCpnt->result |
| * to save status phase stutas byte. |
| * scsi error handler checks host_byte (DID_*: |
| * low level driver to indicate status), then checks |
| * status_byte (SCSI status byte). |
| */ |
| SCpnt->result = (int)nsp32_read1(base, SCSI_CSB_IN); |
| } |
| |
| if (auto_stat & ILLEGAL_PHASE) { |
| /* Illegal phase is detected. SACK is not back. */ |
| nsp32_msg(KERN_WARNING, |
| "AUTO SCSI ILLEGAL PHASE OCCUR!!!!"); |
| |
| /* TODO: currently we don't have any action... bus reset? */ |
| |
| /* |
| * To send back SACK, assert, wait, and negate. |
| */ |
| nsp32_sack_assert(data); |
| nsp32_wait_req(data, NEGATE); |
| nsp32_sack_negate(data); |
| |
| } |
| |
| if (auto_stat & COMMAND_PHASE) { |
| /* nothing to do */ |
| nsp32_dbg(NSP32_DEBUG_INTR, "Command phase processed"); |
| } |
| |
| if (auto_stat & AUTOSCSI_BUSY) { |
| /* AutoSCSI is running */ |
| } |
| |
| show_autophase(auto_stat); |
| } |
| |
| /* FIFO_SHLD_IRQ */ |
| if (irq_stat & IRQSTATUS_FIFO_SHLD_IRQ) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "FIFO IRQ"); |
| |
| switch(busphase) { |
| case BUSPHASE_DATA_OUT: |
| nsp32_dbg(NSP32_DEBUG_INTR, "fifo/write"); |
| |
| //nsp32_pio_write(SCpnt); |
| |
| break; |
| |
| case BUSPHASE_DATA_IN: |
| nsp32_dbg(NSP32_DEBUG_INTR, "fifo/read"); |
| |
| //nsp32_pio_read(SCpnt); |
| |
| break; |
| |
| case BUSPHASE_STATUS: |
| nsp32_dbg(NSP32_DEBUG_INTR, "fifo/status"); |
| |
| SCpnt->SCp.Status = nsp32_read1(base, SCSI_CSB_IN); |
| |
| break; |
| default: |
| nsp32_dbg(NSP32_DEBUG_INTR, "fifo/other phase"); |
| nsp32_dbg(NSP32_DEBUG_INTR, "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat); |
| show_busphase(busphase); |
| break; |
| } |
| |
| goto out; |
| } |
| |
| /* Phase Change IRQ */ |
| if (irq_stat & IRQSTATUS_PHASE_CHANGE_IRQ) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "phase change IRQ"); |
| |
| switch(busphase) { |
| case BUSPHASE_MESSAGE_IN: |
| nsp32_dbg(NSP32_DEBUG_INTR, "phase chg/msg in"); |
| nsp32_msgin_occur(SCpnt, irq_stat, 0); |
| break; |
| default: |
| nsp32_msg(KERN_WARNING, "phase chg/other phase?"); |
| nsp32_msg(KERN_WARNING, "irq_stat=0x%x trans_stat=0x%x\n", |
| irq_stat, trans_stat); |
| show_busphase(busphase); |
| break; |
| } |
| goto out; |
| } |
| |
| /* PCI_IRQ */ |
| if (irq_stat & IRQSTATUS_PCI_IRQ) { |
| nsp32_dbg(NSP32_DEBUG_INTR, "PCI IRQ occurred"); |
| /* Do nothing */ |
| } |
| |
| /* BMCNTERR_IRQ */ |
| if (irq_stat & IRQSTATUS_BMCNTERR_IRQ) { |
| nsp32_msg(KERN_ERR, "Received unexpected BMCNTERR IRQ! "); |
| /* |
| * TODO: To be implemented improving bus master |
| * transfer reliability when BMCNTERR is occurred in |
| * AutoSCSI phase described in specification. |
| */ |
| } |
| |
| #if 0 |
| nsp32_dbg(NSP32_DEBUG_INTR, |
| "irq_stat=0x%x trans_stat=0x%x", irq_stat, trans_stat); |
| show_busphase(busphase); |
| #endif |
| |
| out: |
| /* disable IRQ mask */ |
| nsp32_write2(base, IRQ_CONTROL, 0); |
| |
| out2: |
| spin_unlock_irqrestore(host->host_lock, flags); |
| |
| nsp32_dbg(NSP32_DEBUG_INTR, "exit"); |
| |
| return IRQ_RETVAL(handled); |
| } |
| |
| |
| static int nsp32_show_info(struct seq_file *m, struct Scsi_Host *host) |
| { |
| unsigned long flags; |
| nsp32_hw_data *data; |
| int hostno; |
| unsigned int base; |
| unsigned char mode_reg; |
| int id, speed; |
| long model; |
| |
| hostno = host->host_no; |
| data = (nsp32_hw_data *)host->hostdata; |
| base = host->io_port; |
| |
| seq_puts(m, "NinjaSCSI-32 status\n\n"); |
| seq_printf(m, "Driver version: %s, $Revision: 1.33 $\n", nsp32_release_version); |
| seq_printf(m, "SCSI host No.: %d\n", hostno); |
| seq_printf(m, "IRQ: %d\n", host->irq); |
| seq_printf(m, "IO: 0x%lx-0x%lx\n", host->io_port, host->io_port + host->n_io_port - 1); |
| seq_printf(m, "MMIO(virtual address): 0x%lx-0x%lx\n", host->base, host->base + data->MmioLength - 1); |
| seq_printf(m, "sg_tablesize: %d\n", host->sg_tablesize); |
| seq_printf(m, "Chip revision: 0x%x\n", (nsp32_read2(base, INDEX_REG) >> 8) & 0xff); |
| |
| mode_reg = nsp32_index_read1(base, CHIP_MODE); |
| model = data->pci_devid->driver_data; |
| |
| #ifdef CONFIG_PM |
| seq_printf(m, "Power Management: %s\n", (mode_reg & OPTF) ? "yes" : "no"); |
| #endif |
| seq_printf(m, "OEM: %ld, %s\n", (mode_reg & (OEM0|OEM1)), nsp32_model[model]); |
| |
| spin_lock_irqsave(&(data->Lock), flags); |
| seq_printf(m, "CurrentSC: 0x%p\n\n", data->CurrentSC); |
| spin_unlock_irqrestore(&(data->Lock), flags); |
| |
| |
| seq_puts(m, "SDTR status\n"); |
| for (id = 0; id < ARRAY_SIZE(data->target); id++) { |
| |
| seq_printf(m, "id %d: ", id); |
| |
| if (id == host->this_id) { |
| seq_puts(m, "----- NinjaSCSI-32 host adapter\n"); |
| continue; |
| } |
| |
| if (data->target[id].sync_flag == SDTR_DONE) { |
| if (data->target[id].period == 0 && |
| data->target[id].offset == ASYNC_OFFSET ) { |
| seq_puts(m, "async"); |
| } else { |
| seq_puts(m, " sync"); |
| } |
| } else { |
| seq_puts(m, " none"); |
| } |
| |
| if (data->target[id].period != 0) { |
| |
| speed = 1000000 / (data->target[id].period * 4); |
| |
| seq_printf(m, " transfer %d.%dMB/s, offset %d", |
| speed / 1000, |
| speed % 1000, |
| data->target[id].offset |
| ); |
| } |
| seq_putc(m, '\n'); |
| } |
| return 0; |
| } |
| |
| |
| |
| /* |
| * Reset parameters and call scsi_done for data->cur_lunt. |
| * Be careful setting SCpnt->result = DID_* before calling this function. |
| */ |
| static void nsp32_scsi_done(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| |
| scsi_dma_unmap(SCpnt); |
| |
| /* |
| * clear TRANSFERCONTROL_BM_START |
| */ |
| nsp32_write2(base, TRANSFER_CONTROL, 0); |
| nsp32_write4(base, BM_CNT, 0); |
| |
| /* |
| * call scsi_done |
| */ |
| (*SCpnt->scsi_done)(SCpnt); |
| |
| /* |
| * reset parameters |
| */ |
| data->cur_lunt->SCpnt = NULL; |
| data->cur_lunt = NULL; |
| data->cur_target = NULL; |
| data->CurrentSC = NULL; |
| } |
| |
| |
| /* |
| * Bus Free Occur |
| * |
| * Current Phase is BUSFREE. AutoSCSI is automatically execute BUSFREE phase |
| * with ACK reply when below condition is matched: |
| * MsgIn 00: Command Complete. |
| * MsgIn 02: Save Data Pointer. |
| * MsgIn 04: Diconnect. |
| * In other case, unexpected BUSFREE is detected. |
| */ |
| static int nsp32_busfree_occur(struct scsi_cmnd *SCpnt, unsigned short execph) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| |
| nsp32_dbg(NSP32_DEBUG_BUSFREE, "enter execph=0x%x", execph); |
| show_autophase(execph); |
| |
| nsp32_write4(base, BM_CNT, 0); |
| nsp32_write2(base, TRANSFER_CONTROL, 0); |
| |
| /* |
| * MsgIn 02: Save Data Pointer |
| * |
| * VALID: |
| * Save Data Pointer is received. Adjust pointer. |
| * |
| * NO-VALID: |
| * SCSI-3 says if Save Data Pointer is not received, then we restart |
| * processing and we can't adjust any SCSI data pointer in next data |
| * phase. |
| */ |
| if (execph & MSGIN_02_VALID) { |
| nsp32_dbg(NSP32_DEBUG_BUSFREE, "MsgIn02_Valid"); |
| |
| /* |
| * Check sack_cnt/saved_sack_cnt, then adjust sg table if |
| * needed. |
| */ |
| if (!(execph & MSGIN_00_VALID) && |
| ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE))) { |
| unsigned int sacklen, s_sacklen; |
| |
| /* |
| * Read SACK count and SAVEDSACK count, then compare. |
| */ |
| sacklen = nsp32_read4(base, SACK_CNT ); |
| s_sacklen = nsp32_read4(base, SAVED_SACK_CNT); |
| |
| /* |
| * If SAVEDSACKCNT == 0, it means SavedDataPointer is |
| * come after data transferring. |
| */ |
| if (s_sacklen > 0) { |
| /* |
| * Comparing between sack and savedsack to |
| * check the condition of AutoMsgIn03. |
| * |
| * If they are same, set msgin03 == TRUE, |
| * COMMANDCONTROL_AUTO_MSGIN_03 is enabled at |
| * reselection. On the other hand, if they |
| * aren't same, set msgin03 == FALSE, and |
| * COMMANDCONTROL_AUTO_MSGIN_03 is disabled at |
| * reselection. |
| */ |
| if (sacklen != s_sacklen) { |
| data->cur_lunt->msgin03 = FALSE; |
| } else { |
| data->cur_lunt->msgin03 = TRUE; |
| } |
| |
| nsp32_adjust_busfree(SCpnt, s_sacklen); |
| } |
| } |
| |
| /* This value has not substitude with valid value yet... */ |
| //data->cur_lunt->save_datp = data->cur_datp; |
| } else { |
| /* |
| * no processing. |
| */ |
| } |
| |
| if (execph & MSGIN_03_VALID) { |
| /* MsgIn03 was valid to be processed. No need processing. */ |
| } |
| |
| /* |
| * target SDTR check |
| */ |
| if (data->cur_target->sync_flag & SDTR_INITIATOR) { |
| /* |
| * SDTR negotiation pulled by the initiator has not |
| * finished yet. Fall back to ASYNC mode. |
| */ |
| nsp32_set_async(data, data->cur_target); |
| data->cur_target->sync_flag &= ~SDTR_INITIATOR; |
| data->cur_target->sync_flag |= SDTR_DONE; |
| } else if (data->cur_target->sync_flag & SDTR_TARGET) { |
| /* |
| * SDTR negotiation pulled by the target has been |
| * negotiating. |
| */ |
| if (execph & (MSGIN_00_VALID | MSGIN_04_VALID)) { |
| /* |
| * If valid message is received, then |
| * negotiation is succeeded. |
| */ |
| } else { |
| /* |
| * On the contrary, if unexpected bus free is |
| * occurred, then negotiation is failed. Fall |
| * back to ASYNC mode. |
| */ |
| nsp32_set_async(data, data->cur_target); |
| } |
| data->cur_target->sync_flag &= ~SDTR_TARGET; |
| data->cur_target->sync_flag |= SDTR_DONE; |
| } |
| |
| /* |
| * It is always ensured by SCSI standard that initiator |
| * switches into Bus Free Phase after |
| * receiving message 00 (Command Complete), 04 (Disconnect). |
| * It's the reason that processing here is valid. |
| */ |
| if (execph & MSGIN_00_VALID) { |
| /* MsgIn 00: Command Complete */ |
| nsp32_dbg(NSP32_DEBUG_BUSFREE, "command complete"); |
| |
| SCpnt->SCp.Status = nsp32_read1(base, SCSI_CSB_IN); |
| SCpnt->SCp.Message = 0; |
| nsp32_dbg(NSP32_DEBUG_BUSFREE, |
| "normal end stat=0x%x resid=0x%x\n", |
| SCpnt->SCp.Status, scsi_get_resid(SCpnt)); |
| SCpnt->result = (DID_OK << 16) | |
| (SCpnt->SCp.Message << 8) | |
| (SCpnt->SCp.Status << 0); |
| nsp32_scsi_done(SCpnt); |
| /* All operation is done */ |
| return TRUE; |
| } else if (execph & MSGIN_04_VALID) { |
| /* MsgIn 04: Disconnect */ |
| SCpnt->SCp.Status = nsp32_read1(base, SCSI_CSB_IN); |
| SCpnt->SCp.Message = 4; |
| |
| nsp32_dbg(NSP32_DEBUG_BUSFREE, "disconnect"); |
| return TRUE; |
| } else { |
| /* Unexpected bus free */ |
| nsp32_msg(KERN_WARNING, "unexpected bus free occurred"); |
| |
| /* DID_ERROR? */ |
| //SCpnt->result = (DID_OK << 16) | (SCpnt->SCp.Message << 8) | (SCpnt->SCp.Status << 0); |
| SCpnt->result = DID_ERROR << 16; |
| nsp32_scsi_done(SCpnt); |
| return TRUE; |
| } |
| return FALSE; |
| } |
| |
| |
| /* |
| * nsp32_adjust_busfree - adjusting SG table |
| * |
| * Note: This driver adjust the SG table using SCSI ACK |
| * counter instead of BMCNT counter! |
| */ |
| static void nsp32_adjust_busfree(struct scsi_cmnd *SCpnt, unsigned int s_sacklen) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| int old_entry = data->cur_entry; |
| int new_entry; |
| int sg_num = data->cur_lunt->sg_num; |
| nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt; |
| unsigned int restlen, sentlen; |
| u32_le len, addr; |
| |
| nsp32_dbg(NSP32_DEBUG_SGLIST, "old resid=0x%x", scsi_get_resid(SCpnt)); |
| |
| /* adjust saved SACK count with 4 byte start address boundary */ |
| s_sacklen -= le32_to_cpu(sgt[old_entry].addr) & 3; |
| |
| /* |
| * calculate new_entry from sack count and each sgt[].len |
| * calculate the byte which is intent to send |
| */ |
| sentlen = 0; |
| for (new_entry = old_entry; new_entry < sg_num; new_entry++) { |
| sentlen += (le32_to_cpu(sgt[new_entry].len) & ~SGTEND); |
| if (sentlen > s_sacklen) { |
| break; |
| } |
| } |
| |
| /* all sgt is processed */ |
| if (new_entry == sg_num) { |
| goto last; |
| } |
| |
| if (sentlen == s_sacklen) { |
| /* XXX: confirm it's ok or not */ |
| /* In this case, it's ok because we are at |
| the head element of the sg. restlen is correctly calculated. */ |
| } |
| |
| /* calculate the rest length for transferring */ |
| restlen = sentlen - s_sacklen; |
| |
| /* update adjusting current SG table entry */ |
| len = le32_to_cpu(sgt[new_entry].len); |
| addr = le32_to_cpu(sgt[new_entry].addr); |
| addr += (len - restlen); |
| sgt[new_entry].addr = cpu_to_le32(addr); |
| sgt[new_entry].len = cpu_to_le32(restlen); |
| |
| /* set cur_entry with new_entry */ |
| data->cur_entry = new_entry; |
| |
| return; |
| |
| last: |
| if (scsi_get_resid(SCpnt) < sentlen) { |
| nsp32_msg(KERN_ERR, "resid underflow"); |
| } |
| |
| scsi_set_resid(SCpnt, scsi_get_resid(SCpnt) - sentlen); |
| nsp32_dbg(NSP32_DEBUG_SGLIST, "new resid=0x%x", scsi_get_resid(SCpnt)); |
| |
| /* update hostdata and lun */ |
| |
| return; |
| } |
| |
| |
| /* |
| * It's called MsgOut phase occur. |
| * NinjaSCSI-32Bi/UDE automatically processes up to 3 messages in |
| * message out phase. It, however, has more than 3 messages, |
| * HBA creates the interrupt and we have to process by hand. |
| */ |
| static void nsp32_msgout_occur(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| //unsigned short command; |
| long new_sgtp; |
| int i; |
| |
| nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, |
| "enter: msgout_len: 0x%x", data->msgout_len); |
| |
| /* |
| * If MsgOut phase is occurred without having any |
| * message, then No_Operation is sent (SCSI-2). |
| */ |
| if (data->msgout_len == 0) { |
| nsp32_build_nop(SCpnt); |
| } |
| |
| /* |
| * Set SGTP ADDR current entry for restarting AUTOSCSI, |
| * because SGTP is incremented next point. |
| * There is few statement in the specification... |
| */ |
| new_sgtp = data->cur_lunt->sglun_paddr + |
| (data->cur_lunt->cur_entry * sizeof(nsp32_sgtable)); |
| |
| /* |
| * send messages |
| */ |
| for (i = 0; i < data->msgout_len; i++) { |
| nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, |
| "%d : 0x%x", i, data->msgoutbuf[i]); |
| |
| /* |
| * Check REQ is asserted. |
| */ |
| nsp32_wait_req(data, ASSERT); |
| |
| if (i == (data->msgout_len - 1)) { |
| /* |
| * If the last message, set the AutoSCSI restart |
| * before send back the ack message. AutoSCSI |
| * restart automatically negate ATN signal. |
| */ |
| //command = (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02); |
| //nsp32_restart_autoscsi(SCpnt, command); |
| nsp32_write2(base, COMMAND_CONTROL, |
| (CLEAR_CDB_FIFO_POINTER | |
| AUTO_COMMAND_PHASE | |
| AUTOSCSI_RESTART | |
| AUTO_MSGIN_00_OR_04 | |
| AUTO_MSGIN_02 )); |
| } |
| /* |
| * Write data with SACK, then wait sack is |
| * automatically negated. |
| */ |
| nsp32_write1(base, SCSI_DATA_WITH_ACK, data->msgoutbuf[i]); |
| nsp32_wait_sack(data, NEGATE); |
| |
| nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "bus: 0x%x\n", |
| nsp32_read1(base, SCSI_BUS_MONITOR)); |
| }; |
| |
| data->msgout_len = 0; |
| |
| nsp32_dbg(NSP32_DEBUG_MSGOUTOCCUR, "exit"); |
| } |
| |
| /* |
| * Restart AutoSCSI |
| * |
| * Note: Restarting AutoSCSI needs set: |
| * SYNC_REG, ACK_WIDTH, SGT_ADR, TRANSFER_CONTROL |
| */ |
| static void nsp32_restart_autoscsi(struct scsi_cmnd *SCpnt, unsigned short command) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = data->BaseAddress; |
| unsigned short transfer = 0; |
| |
| nsp32_dbg(NSP32_DEBUG_RESTART, "enter"); |
| |
| if (data->cur_target == NULL || data->cur_lunt == NULL) { |
| nsp32_msg(KERN_ERR, "Target or Lun is invalid"); |
| } |
| |
| /* |
| * set SYNC_REG |
| * Don't set BM_START_ADR before setting this register. |
| */ |
| nsp32_write1(base, SYNC_REG, data->cur_target->syncreg); |
| |
| /* |
| * set ACKWIDTH |
| */ |
| nsp32_write1(base, ACK_WIDTH, data->cur_target->ackwidth); |
| |
| /* |
| * set SREQ hazard killer sampling rate |
| */ |
| nsp32_write1(base, SREQ_SMPL_RATE, data->cur_target->sample_reg); |
| |
| /* |
| * set SGT ADDR (physical address) |
| */ |
| nsp32_write4(base, SGT_ADR, data->cur_lunt->sglun_paddr); |
| |
| /* |
| * set TRANSFER CONTROL REG |
| */ |
| transfer = 0; |
| transfer |= (TRANSFER_GO | ALL_COUNTER_CLR); |
| if (data->trans_method & NSP32_TRANSFER_BUSMASTER) { |
| if (scsi_bufflen(SCpnt) > 0) { |
| transfer |= BM_START; |
| } |
| } else if (data->trans_method & NSP32_TRANSFER_MMIO) { |
| transfer |= CB_MMIO_MODE; |
| } else if (data->trans_method & NSP32_TRANSFER_PIO) { |
| transfer |= CB_IO_MODE; |
| } |
| nsp32_write2(base, TRANSFER_CONTROL, transfer); |
| |
| /* |
| * restart AutoSCSI |
| * |
| * TODO: COMMANDCONTROL_AUTO_COMMAND_PHASE is needed ? |
| */ |
| command |= (CLEAR_CDB_FIFO_POINTER | |
| AUTO_COMMAND_PHASE | |
| AUTOSCSI_RESTART ); |
| nsp32_write2(base, COMMAND_CONTROL, command); |
| |
| nsp32_dbg(NSP32_DEBUG_RESTART, "exit"); |
| } |
| |
| |
| /* |
| * cannot run automatically message in occur |
| */ |
| static void nsp32_msgin_occur(struct scsi_cmnd *SCpnt, |
| unsigned long irq_status, |
| unsigned short execph) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| unsigned char msg; |
| unsigned char msgtype; |
| unsigned char newlun; |
| unsigned short command = 0; |
| int msgclear = TRUE; |
| long new_sgtp; |
| int ret; |
| |
| /* |
| * read first message |
| * Use SCSIDATA_W_ACK instead of SCSIDATAIN, because the procedure |
| * of Message-In have to be processed before sending back SCSI ACK. |
| */ |
| msg = nsp32_read1(base, SCSI_DATA_IN); |
| data->msginbuf[(unsigned char)data->msgin_len] = msg; |
| msgtype = data->msginbuf[0]; |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, |
| "enter: msglen: 0x%x msgin: 0x%x msgtype: 0x%x", |
| data->msgin_len, msg, msgtype); |
| |
| /* |
| * TODO: We need checking whether bus phase is message in? |
| */ |
| |
| /* |
| * assert SCSI ACK |
| */ |
| nsp32_sack_assert(data); |
| |
| /* |
| * processing IDENTIFY |
| */ |
| if (msgtype & 0x80) { |
| if (!(irq_status & IRQSTATUS_RESELECT_OCCUER)) { |
| /* Invalid (non reselect) phase */ |
| goto reject; |
| } |
| |
| newlun = msgtype & 0x1f; /* TODO: SPI-3 compliant? */ |
| ret = nsp32_reselection(SCpnt, newlun); |
| if (ret == TRUE) { |
| goto restart; |
| } else { |
| goto reject; |
| } |
| } |
| |
| /* |
| * processing messages except for IDENTIFY |
| * |
| * TODO: Messages are all SCSI-2 terminology. SCSI-3 compliance is TODO. |
| */ |
| switch (msgtype) { |
| /* |
| * 1-byte message |
| */ |
| case COMMAND_COMPLETE: |
| case DISCONNECT: |
| /* |
| * These messages should not be occurred. |
| * They should be processed on AutoSCSI sequencer. |
| */ |
| nsp32_msg(KERN_WARNING, |
| "unexpected message of AutoSCSI MsgIn: 0x%x", msg); |
| break; |
| |
| case RESTORE_POINTERS: |
| /* |
| * AutoMsgIn03 is disabled, and HBA gets this message. |
| */ |
| |
| if ((execph & DATA_IN_PHASE) || (execph & DATA_OUT_PHASE)) { |
| unsigned int s_sacklen; |
| |
| s_sacklen = nsp32_read4(base, SAVED_SACK_CNT); |
| if ((execph & MSGIN_02_VALID) && (s_sacklen > 0)) { |
| nsp32_adjust_busfree(SCpnt, s_sacklen); |
| } else { |
| /* No need to rewrite SGT */ |
| } |
| } |
| data->cur_lunt->msgin03 = FALSE; |
| |
| /* Update with the new value */ |
| |
| /* reset SACK/SavedACK counter (or ALL clear?) */ |
| nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK); |
| |
| /* |
| * set new sg pointer |
| */ |
| new_sgtp = data->cur_lunt->sglun_paddr + |
| (data->cur_lunt->cur_entry * sizeof(nsp32_sgtable)); |
| nsp32_write4(base, SGT_ADR, new_sgtp); |
| |
| break; |
| |
| case SAVE_POINTERS: |
| /* |
| * These messages should not be occurred. |
| * They should be processed on AutoSCSI sequencer. |
| */ |
| nsp32_msg (KERN_WARNING, |
| "unexpected message of AutoSCSI MsgIn: SAVE_POINTERS"); |
| |
| break; |
| |
| case MESSAGE_REJECT: |
| /* If previous message_out is sending SDTR, and get |
| message_reject from target, SDTR negotiation is failed */ |
| if (data->cur_target->sync_flag & |
| (SDTR_INITIATOR | SDTR_TARGET)) { |
| /* |
| * Current target is negotiating SDTR, but it's |
| * failed. Fall back to async transfer mode, and set |
| * SDTR_DONE. |
| */ |
| nsp32_set_async(data, data->cur_target); |
| data->cur_target->sync_flag &= ~SDTR_INITIATOR; |
| data->cur_target->sync_flag |= SDTR_DONE; |
| |
| } |
| break; |
| |
| case LINKED_CMD_COMPLETE: |
| case LINKED_FLG_CMD_COMPLETE: |
| /* queue tag is not supported currently */ |
| nsp32_msg (KERN_WARNING, |
| "unsupported message: 0x%x", msgtype); |
| break; |
| |
| case INITIATE_RECOVERY: |
| /* staring ECA (Extended Contingent Allegiance) state. */ |
| /* This message is declined in SPI2 or later. */ |
| |
| goto reject; |
| |
| /* |
| * 2-byte message |
| */ |
| case SIMPLE_QUEUE_TAG: |
| case 0x23: |
| /* |
| * 0x23: Ignore_Wide_Residue is not declared in scsi.h. |
| * No support is needed. |
| */ |
| if (data->msgin_len >= 1) { |
| goto reject; |
| } |
| |
| /* current position is 1-byte of 2 byte */ |
| msgclear = FALSE; |
| |
| break; |
| |
| /* |
| * extended message |
| */ |
| case EXTENDED_MESSAGE: |
| if (data->msgin_len < 1) { |
| /* |
| * Current position does not reach 2-byte |
| * (2-byte is extended message length). |
| */ |
| msgclear = FALSE; |
| break; |
| } |
| |
| if ((data->msginbuf[1] + 1) > data->msgin_len) { |
| /* |
| * Current extended message has msginbuf[1] + 2 |
| * (msgin_len starts counting from 0, so buf[1] + 1). |
| * If current message position is not finished, |
| * continue receiving message. |
| */ |
| msgclear = FALSE; |
| break; |
| } |
| |
| /* |
| * Reach here means regular length of each type of |
| * extended messages. |
| */ |
| switch (data->msginbuf[2]) { |
| case EXTENDED_MODIFY_DATA_POINTER: |
| /* TODO */ |
| goto reject; /* not implemented yet */ |
| break; |
| |
| case EXTENDED_SDTR: |
| /* |
| * Exchange this message between initiator and target. |
| */ |
| if (data->msgin_len != EXTENDED_SDTR_LEN + 1) { |
| /* |
| * received inappropriate message. |
| */ |
| goto reject; |
| break; |
| } |
| |
| nsp32_analyze_sdtr(SCpnt); |
| |
| break; |
| |
| case EXTENDED_EXTENDED_IDENTIFY: |
| /* SCSI-I only, not supported. */ |
| goto reject; /* not implemented yet */ |
| |
| break; |
| |
| case EXTENDED_WDTR: |
| goto reject; /* not implemented yet */ |
| |
| break; |
| |
| default: |
| goto reject; |
| } |
| break; |
| |
| default: |
| goto reject; |
| } |
| |
| restart: |
| if (msgclear == TRUE) { |
| data->msgin_len = 0; |
| |
| /* |
| * If restarting AutoSCSI, but there are some message to out |
| * (msgout_len > 0), set AutoATN, and set SCSIMSGOUT as 0 |
| * (MV_VALID = 0). When commandcontrol is written with |
| * AutoSCSI restart, at the same time MsgOutOccur should be |
| * happened (however, such situation is really possible...?). |
| */ |
| if (data->msgout_len > 0) { |
| nsp32_write4(base, SCSI_MSG_OUT, 0); |
| command |= AUTO_ATN; |
| } |
| |
| /* |
| * restart AutoSCSI |
| * If it's failed, COMMANDCONTROL_AUTO_COMMAND_PHASE is needed. |
| */ |
| command |= (AUTO_MSGIN_00_OR_04 | AUTO_MSGIN_02); |
| |
| /* |
| * If current msgin03 is TRUE, then flag on. |
| */ |
| if (data->cur_lunt->msgin03 == TRUE) { |
| command |= AUTO_MSGIN_03; |
| } |
| data->cur_lunt->msgin03 = FALSE; |
| } else { |
| data->msgin_len++; |
| } |
| |
| /* |
| * restart AutoSCSI |
| */ |
| nsp32_restart_autoscsi(SCpnt, command); |
| |
| /* |
| * wait SCSI REQ negate for REQ-ACK handshake |
| */ |
| nsp32_wait_req(data, NEGATE); |
| |
| /* |
| * negate SCSI ACK |
| */ |
| nsp32_sack_negate(data); |
| |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit"); |
| |
| return; |
| |
| reject: |
| nsp32_msg(KERN_WARNING, |
| "invalid or unsupported MessageIn, rejected. " |
| "current msg: 0x%x (len: 0x%x), processing msg: 0x%x", |
| msg, data->msgin_len, msgtype); |
| nsp32_build_reject(SCpnt); |
| data->msgin_len = 0; |
| |
| goto restart; |
| } |
| |
| /* |
| * |
| */ |
| static void nsp32_analyze_sdtr(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| nsp32_target *target = data->cur_target; |
| nsp32_sync_table *synct; |
| unsigned char get_period = data->msginbuf[3]; |
| unsigned char get_offset = data->msginbuf[4]; |
| int entry; |
| int syncnum; |
| |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "enter"); |
| |
| synct = data->synct; |
| syncnum = data->syncnum; |
| |
| /* |
| * If this inititor sent the SDTR message, then target responds SDTR, |
| * initiator SYNCREG, ACKWIDTH from SDTR parameter. |
| * Messages are not appropriate, then send back reject message. |
| * If initiator did not send the SDTR, but target sends SDTR, |
| * initiator calculator the appropriate parameter and send back SDTR. |
| */ |
| if (target->sync_flag & SDTR_INITIATOR) { |
| /* |
| * Initiator sent SDTR, the target responds and |
| * send back negotiation SDTR. |
| */ |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target responds SDTR"); |
| |
| target->sync_flag &= ~SDTR_INITIATOR; |
| target->sync_flag |= SDTR_DONE; |
| |
| /* |
| * offset: |
| */ |
| if (get_offset > SYNC_OFFSET) { |
| /* |
| * Negotiation is failed, the target send back |
| * unexpected offset value. |
| */ |
| goto reject; |
| } |
| |
| if (get_offset == ASYNC_OFFSET) { |
| /* |
| * Negotiation is succeeded, the target want |
| * to fall back into asynchronous transfer mode. |
| */ |
| goto async; |
| } |
| |
| /* |
| * period: |
| * Check whether sync period is too short. If too short, |
| * fall back to async mode. If it's ok, then investigate |
| * the received sync period. If sync period is acceptable |
| * between sync table start_period and end_period, then |
| * set this I_T nexus as sent offset and period. |
| * If it's not acceptable, send back reject and fall back |
| * to async mode. |
| */ |
| if (get_period < data->synct[0].period_num) { |
| /* |
| * Negotiation is failed, the target send back |
| * unexpected period value. |
| */ |
| goto reject; |
| } |
| |
| entry = nsp32_search_period_entry(data, target, get_period); |
| |
| if (entry < 0) { |
| /* |
| * Target want to use long period which is not |
| * acceptable NinjaSCSI-32Bi/UDE. |
| */ |
| goto reject; |
| } |
| |
| /* |
| * Set new sync table and offset in this I_T nexus. |
| */ |
| nsp32_set_sync_entry(data, target, entry, get_offset); |
| } else { |
| /* Target send SDTR to initiator. */ |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "target send SDTR"); |
| |
| target->sync_flag |= SDTR_INITIATOR; |
| |
| /* offset: */ |
| if (get_offset > SYNC_OFFSET) { |
| /* send back as SYNC_OFFSET */ |
| get_offset = SYNC_OFFSET; |
| } |
| |
| /* period: */ |
| if (get_period < data->synct[0].period_num) { |
| get_period = data->synct[0].period_num; |
| } |
| |
| entry = nsp32_search_period_entry(data, target, get_period); |
| |
| if (get_offset == ASYNC_OFFSET || entry < 0) { |
| nsp32_set_async(data, target); |
| nsp32_build_sdtr(SCpnt, 0, ASYNC_OFFSET); |
| } else { |
| nsp32_set_sync_entry(data, target, entry, get_offset); |
| nsp32_build_sdtr(SCpnt, get_period, get_offset); |
| } |
| } |
| |
| target->period = get_period; |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit"); |
| return; |
| |
| reject: |
| /* |
| * If the current message is unacceptable, send back to the target |
| * with reject message. |
| */ |
| nsp32_build_reject(SCpnt); |
| |
| async: |
| nsp32_set_async(data, target); /* set as ASYNC transfer mode */ |
| |
| target->period = 0; |
| nsp32_dbg(NSP32_DEBUG_MSGINOCCUR, "exit: set async"); |
| return; |
| } |
| |
| |
| /* |
| * Search config entry number matched in sync_table from given |
| * target and speed period value. If failed to search, return negative value. |
| */ |
| static int nsp32_search_period_entry(nsp32_hw_data *data, |
| nsp32_target *target, |
| unsigned char period) |
| { |
| int i; |
| |
| if (target->limit_entry >= data->syncnum) { |
| nsp32_msg(KERN_ERR, "limit_entry exceeds syncnum!"); |
| target->limit_entry = 0; |
| } |
| |
| for (i = target->limit_entry; i < data->syncnum; i++) { |
| if (period >= data->synct[i].start_period && |
| period <= data->synct[i].end_period) { |
| break; |
| } |
| } |
| |
| /* |
| * Check given period value is over the sync_table value. |
| * If so, return max value. |
| */ |
| if (i == data->syncnum) { |
| i = -1; |
| } |
| |
| return i; |
| } |
| |
| |
| /* |
| * target <-> initiator use ASYNC transfer |
| */ |
| static void nsp32_set_async(nsp32_hw_data *data, nsp32_target *target) |
| { |
| unsigned char period = data->synct[target->limit_entry].period_num; |
| |
| target->offset = ASYNC_OFFSET; |
| target->period = 0; |
| target->syncreg = TO_SYNCREG(period, ASYNC_OFFSET); |
| target->ackwidth = 0; |
| target->sample_reg = 0; |
| |
| nsp32_dbg(NSP32_DEBUG_SYNC, "set async"); |
| } |
| |
| |
| /* |
| * target <-> initiator use maximum SYNC transfer |
| */ |
| static void nsp32_set_max_sync(nsp32_hw_data *data, |
| nsp32_target *target, |
| unsigned char *period, |
| unsigned char *offset) |
| { |
| unsigned char period_num, ackwidth; |
| |
| period_num = data->synct[target->limit_entry].period_num; |
| *period = data->synct[target->limit_entry].start_period; |
| ackwidth = data->synct[target->limit_entry].ackwidth; |
| *offset = SYNC_OFFSET; |
| |
| target->syncreg = TO_SYNCREG(period_num, *offset); |
| target->ackwidth = ackwidth; |
| target->offset = *offset; |
| target->sample_reg = 0; /* disable SREQ sampling */ |
| } |
| |
| |
| /* |
| * target <-> initiator use entry number speed |
| */ |
| static void nsp32_set_sync_entry(nsp32_hw_data *data, |
| nsp32_target *target, |
| int entry, |
| unsigned char offset) |
| { |
| unsigned char period, ackwidth, sample_rate; |
| |
| period = data->synct[entry].period_num; |
| ackwidth = data->synct[entry].ackwidth; |
| offset = offset; |
| sample_rate = data->synct[entry].sample_rate; |
| |
| target->syncreg = TO_SYNCREG(period, offset); |
| target->ackwidth = ackwidth; |
| target->offset = offset; |
| target->sample_reg = sample_rate | SAMPLING_ENABLE; |
| |
| nsp32_dbg(NSP32_DEBUG_SYNC, "set sync"); |
| } |
| |
| |
| /* |
| * It waits until SCSI REQ becomes assertion or negation state. |
| * |
| * Note: If nsp32_msgin_occur is called, we asserts SCSI ACK. Then |
| * connected target responds SCSI REQ negation. We have to wait |
| * SCSI REQ becomes negation in order to negate SCSI ACK signal for |
| * REQ-ACK handshake. |
| */ |
| static void nsp32_wait_req(nsp32_hw_data *data, int state) |
| { |
| unsigned int base = data->BaseAddress; |
| int wait_time = 0; |
| unsigned char bus, req_bit; |
| |
| if (!((state == ASSERT) || (state == NEGATE))) { |
| nsp32_msg(KERN_ERR, "unknown state designation"); |
| } |
| /* REQ is BIT(5) */ |
| req_bit = (state == ASSERT ? BUSMON_REQ : 0); |
| |
| do { |
| bus = nsp32_read1(base, SCSI_BUS_MONITOR); |
| if ((bus & BUSMON_REQ) == req_bit) { |
| nsp32_dbg(NSP32_DEBUG_WAIT, |
| "wait_time: %d", wait_time); |
| return; |
| } |
| udelay(1); |
| wait_time++; |
| } while (wait_time < REQSACK_TIMEOUT_TIME); |
| |
| nsp32_msg(KERN_WARNING, "wait REQ timeout, req_bit: 0x%x", req_bit); |
| } |
| |
| /* |
| * It waits until SCSI SACK becomes assertion or negation state. |
| */ |
| static void nsp32_wait_sack(nsp32_hw_data *data, int state) |
| { |
| unsigned int base = data->BaseAddress; |
| int wait_time = 0; |
| unsigned char bus, ack_bit; |
| |
| if (!((state == ASSERT) || (state == NEGATE))) { |
| nsp32_msg(KERN_ERR, "unknown state designation"); |
| } |
| /* ACK is BIT(4) */ |
| ack_bit = (state == ASSERT ? BUSMON_ACK : 0); |
| |
| do { |
| bus = nsp32_read1(base, SCSI_BUS_MONITOR); |
| if ((bus & BUSMON_ACK) == ack_bit) { |
| nsp32_dbg(NSP32_DEBUG_WAIT, |
| "wait_time: %d", wait_time); |
| return; |
| } |
| udelay(1); |
| wait_time++; |
| } while (wait_time < REQSACK_TIMEOUT_TIME); |
| |
| nsp32_msg(KERN_WARNING, "wait SACK timeout, ack_bit: 0x%x", ack_bit); |
| } |
| |
| /* |
| * assert SCSI ACK |
| * |
| * Note: SCSI ACK assertion needs with ACKENB=1, AUTODIRECTION=1. |
| */ |
| static void nsp32_sack_assert(nsp32_hw_data *data) |
| { |
| unsigned int base = data->BaseAddress; |
| unsigned char busctrl; |
| |
| busctrl = nsp32_read1(base, SCSI_BUS_CONTROL); |
| busctrl |= (BUSCTL_ACK | AUTODIRECTION | ACKENB); |
| nsp32_write1(base, SCSI_BUS_CONTROL, busctrl); |
| } |
| |
| /* |
| * negate SCSI ACK |
| */ |
| static void nsp32_sack_negate(nsp32_hw_data *data) |
| { |
| unsigned int base = data->BaseAddress; |
| unsigned char busctrl; |
| |
| busctrl = nsp32_read1(base, SCSI_BUS_CONTROL); |
| busctrl &= ~BUSCTL_ACK; |
| nsp32_write1(base, SCSI_BUS_CONTROL, busctrl); |
| } |
| |
| |
| |
| /* |
| * Note: n_io_port is defined as 0x7f because I/O register port is |
| * assigned as: |
| * 0x800-0x8ff: memory mapped I/O port |
| * 0x900-0xbff: (map same 0x800-0x8ff I/O port image repeatedly) |
| * 0xc00-0xfff: CardBus status registers |
| */ |
| static int nsp32_detect(struct pci_dev *pdev) |
| { |
| struct Scsi_Host *host; /* registered host structure */ |
| struct resource *res; |
| nsp32_hw_data *data; |
| int ret; |
| int i, j; |
| |
| nsp32_dbg(NSP32_DEBUG_REGISTER, "enter"); |
| |
| /* |
| * register this HBA as SCSI device |
| */ |
| host = scsi_host_alloc(&nsp32_template, sizeof(nsp32_hw_data)); |
| if (host == NULL) { |
| nsp32_msg (KERN_ERR, "failed to scsi register"); |
| goto err; |
| } |
| |
| /* |
| * set nsp32_hw_data |
| */ |
| data = (nsp32_hw_data *)host->hostdata; |
| |
| memcpy(data, &nsp32_data_base, sizeof(nsp32_hw_data)); |
| |
| host->irq = data->IrqNumber; |
| host->io_port = data->BaseAddress; |
| host->unique_id = data->BaseAddress; |
| host->n_io_port = data->NumAddress; |
| host->base = (unsigned long)data->MmioAddress; |
| |
| data->Host = host; |
| spin_lock_init(&(data->Lock)); |
| |
| data->cur_lunt = NULL; |
| data->cur_target = NULL; |
| |
| /* |
| * Bus master transfer mode is supported currently. |
| */ |
| data->trans_method = NSP32_TRANSFER_BUSMASTER; |
| |
| /* |
| * Set clock div, CLOCK_4 (HBA has own external clock, and |
| * dividing * 100ns/4). |
| * Currently CLOCK_4 has only tested, not for CLOCK_2/PCICLK yet. |
| */ |
| data->clock = CLOCK_4; |
| |
| /* |
| * Select appropriate nsp32_sync_table and set I_CLOCKDIV. |
| */ |
| switch (data->clock) { |
| case CLOCK_4: |
| /* If data->clock is CLOCK_4, then select 40M sync table. */ |
| data->synct = nsp32_sync_table_40M; |
| data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M); |
| break; |
| case CLOCK_2: |
| /* If data->clock is CLOCK_2, then select 20M sync table. */ |
| data->synct = nsp32_sync_table_20M; |
| data->syncnum = ARRAY_SIZE(nsp32_sync_table_20M); |
| break; |
| case PCICLK: |
| /* If data->clock is PCICLK, then select pci sync table. */ |
| data->synct = nsp32_sync_table_pci; |
| data->syncnum = ARRAY_SIZE(nsp32_sync_table_pci); |
| break; |
| default: |
| nsp32_msg(KERN_WARNING, |
| "Invalid clock div is selected, set CLOCK_4."); |
| /* Use default value CLOCK_4 */ |
| data->clock = CLOCK_4; |
| data->synct = nsp32_sync_table_40M; |
| data->syncnum = ARRAY_SIZE(nsp32_sync_table_40M); |
| } |
| |
| /* |
| * setup nsp32_lunt |
| */ |
| |
| /* |
| * setup DMA |
| */ |
| if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0) { |
| nsp32_msg (KERN_ERR, "failed to set PCI DMA mask"); |
| goto scsi_unregister; |
| } |
| |
| /* |
| * allocate autoparam DMA resource. |
| */ |
| data->autoparam = pci_alloc_consistent(pdev, sizeof(nsp32_autoparam), &(data->auto_paddr)); |
| if (data->autoparam == NULL) { |
| nsp32_msg(KERN_ERR, "failed to allocate DMA memory"); |
| goto scsi_unregister; |
| } |
| |
| /* |
| * allocate scatter-gather DMA resource. |
| */ |
| data->sg_list = pci_alloc_consistent(pdev, NSP32_SG_TABLE_SIZE, |
| &(data->sg_paddr)); |
| if (data->sg_list == NULL) { |
| nsp32_msg(KERN_ERR, "failed to allocate DMA memory"); |
| goto free_autoparam; |
| } |
| |
| for (i = 0; i < ARRAY_SIZE(data->lunt); i++) { |
| for (j = 0; j < ARRAY_SIZE(data->lunt[0]); j++) { |
| int offset = i * ARRAY_SIZE(data->lunt[0]) + j; |
| nsp32_lunt tmp = { |
| .SCpnt = NULL, |
| .save_datp = 0, |
| .msgin03 = FALSE, |
| .sg_num = 0, |
| .cur_entry = 0, |
| .sglun = &(data->sg_list[offset]), |
| .sglun_paddr = data->sg_paddr + (offset * sizeof(nsp32_sglun)), |
| }; |
| |
| data->lunt[i][j] = tmp; |
| } |
| } |
| |
| /* |
| * setup target |
| */ |
| for (i = 0; i < ARRAY_SIZE(data->target); i++) { |
| nsp32_target *target = &(data->target[i]); |
| |
| target->limit_entry = 0; |
| target->sync_flag = 0; |
| nsp32_set_async(data, target); |
| } |
| |
| /* |
| * EEPROM check |
| */ |
| ret = nsp32_getprom_param(data); |
| if (ret == FALSE) { |
| data->resettime = 3; /* default 3 */ |
| } |
| |
| /* |
| * setup HBA |
| */ |
| nsp32hw_init(data); |
| |
| snprintf(data->info_str, sizeof(data->info_str), |
| "NinjaSCSI-32Bi/UDE: irq %d, io 0x%lx+0x%x", |
| host->irq, host->io_port, host->n_io_port); |
| |
| /* |
| * SCSI bus reset |
| * |
| * Note: It's important to reset SCSI bus in initialization phase. |
| * NinjaSCSI-32Bi/UDE HBA EEPROM seems to exchange SDTR when |
| * system is coming up, so SCSI devices connected to HBA is set as |
| * un-asynchronous mode. It brings the merit that this HBA is |
| * ready to start synchronous transfer without any preparation, |
| * but we are difficult to control transfer speed. In addition, |
| * it prevents device transfer speed from effecting EEPROM start-up |
| * SDTR. NinjaSCSI-32Bi/UDE has the feature if EEPROM is set as |
| * Auto Mode, then FAST-10M is selected when SCSI devices are |
| * connected same or more than 4 devices. It should be avoided |
| * depending on this specification. Thus, resetting the SCSI bus |
| * restores all connected SCSI devices to asynchronous mode, then |
| * this driver set SDTR safely later, and we can control all SCSI |
| * device transfer mode. |
| */ |
| nsp32_do_bus_reset(data); |
| |
| ret = request_irq(host->irq, do_nsp32_isr, IRQF_SHARED, "nsp32", data); |
| if (ret < 0) { |
| nsp32_msg(KERN_ERR, "Unable to allocate IRQ for NinjaSCSI32 " |
| "SCSI PCI controller. Interrupt: %d", host->irq); |
| goto free_sg_list; |
| } |
| |
| /* |
| * PCI IO register |
| */ |
| res = request_region(host->io_port, host->n_io_port, "nsp32"); |
| if (res == NULL) { |
| nsp32_msg(KERN_ERR, |
| "I/O region 0x%lx+0x%lx is already used", |
| data->BaseAddress, data->NumAddress); |
| goto free_irq; |
| } |
| |
| ret = scsi_add_host(host, &pdev->dev); |
| if (ret) { |
| nsp32_msg(KERN_ERR, "failed to add scsi host"); |
| goto free_region; |
| } |
| scsi_scan_host(host); |
| pci_set_drvdata(pdev, host); |
| return 0; |
| |
| free_region: |
| release_region(host->io_port, host->n_io_port); |
| |
| free_irq: |
| free_irq(host->irq, data); |
| |
| free_sg_list: |
| pci_free_consistent(pdev, NSP32_SG_TABLE_SIZE, |
| data->sg_list, data->sg_paddr); |
| |
| free_autoparam: |
| pci_free_consistent(pdev, sizeof(nsp32_autoparam), |
| data->autoparam, data->auto_paddr); |
| |
| scsi_unregister: |
| scsi_host_put(host); |
| |
| err: |
| return 1; |
| } |
| |
| static int nsp32_release(struct Scsi_Host *host) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)host->hostdata; |
| |
| if (data->autoparam) { |
| pci_free_consistent(data->Pci, sizeof(nsp32_autoparam), |
| data->autoparam, data->auto_paddr); |
| } |
| |
| if (data->sg_list) { |
| pci_free_consistent(data->Pci, NSP32_SG_TABLE_SIZE, |
| data->sg_list, data->sg_paddr); |
| } |
| |
| if (host->irq) { |
| free_irq(host->irq, data); |
| } |
| |
| if (host->io_port && host->n_io_port) { |
| release_region(host->io_port, host->n_io_port); |
| } |
| |
| if (data->MmioAddress) { |
| iounmap(data->MmioAddress); |
| } |
| |
| return 0; |
| } |
| |
| static const char *nsp32_info(struct Scsi_Host *shpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)shpnt->hostdata; |
| |
| return data->info_str; |
| } |
| |
| |
| /**************************************************************************** |
| * error handler |
| */ |
| static int nsp32_eh_abort(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| |
| nsp32_msg(KERN_WARNING, "abort"); |
| |
| if (data->cur_lunt->SCpnt == NULL) { |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort failed"); |
| return FAILED; |
| } |
| |
| if (data->cur_target->sync_flag & (SDTR_INITIATOR | SDTR_TARGET)) { |
| /* reset SDTR negotiation */ |
| data->cur_target->sync_flag = 0; |
| nsp32_set_async(data, data->cur_target); |
| } |
| |
| nsp32_write2(base, TRANSFER_CONTROL, 0); |
| nsp32_write2(base, BM_CNT, 0); |
| |
| SCpnt->result = DID_ABORT << 16; |
| nsp32_scsi_done(SCpnt); |
| |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "abort success"); |
| return SUCCESS; |
| } |
| |
| static int nsp32_eh_bus_reset(struct scsi_cmnd *SCpnt) |
| { |
| nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata; |
| unsigned int base = SCpnt->device->host->io_port; |
| |
| spin_lock_irq(SCpnt->device->host->host_lock); |
| |
| nsp32_msg(KERN_INFO, "Bus Reset"); |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt); |
| |
| nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK); |
| nsp32_do_bus_reset(data); |
| nsp32_write2(base, IRQ_CONTROL, 0); |
| |
| spin_unlock_irq(SCpnt->device->host->host_lock); |
| return SUCCESS; /* SCSI bus reset is succeeded at any time. */ |
| } |
| |
| static void nsp32_do_bus_reset(nsp32_hw_data *data) |
| { |
| unsigned int base = data->BaseAddress; |
| unsigned short intrdat; |
| int i; |
| |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "in"); |
| |
| /* |
| * stop all transfer |
| * clear TRANSFERCONTROL_BM_START |
| * clear counter |
| */ |
| nsp32_write2(base, TRANSFER_CONTROL, 0); |
| nsp32_write4(base, BM_CNT, 0); |
| nsp32_write4(base, CLR_COUNTER, CLRCOUNTER_ALLMASK); |
| |
| /* |
| * fall back to asynchronous transfer mode |
| * initialize SDTR negotiation flag |
| */ |
| for (i = 0; i < ARRAY_SIZE(data->target); i++) { |
| nsp32_target *target = &data->target[i]; |
| |
| target->sync_flag = 0; |
| nsp32_set_async(data, target); |
| } |
| |
| /* |
| * reset SCSI bus |
| */ |
| nsp32_write1(base, SCSI_BUS_CONTROL, BUSCTL_RST); |
| mdelay(RESET_HOLD_TIME / 1000); |
| nsp32_write1(base, SCSI_BUS_CONTROL, 0); |
| for(i = 0; i < 5; i++) { |
| intrdat = nsp32_read2(base, IRQ_STATUS); /* dummy read */ |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "irq:1: 0x%x", intrdat); |
| } |
| |
| data->CurrentSC = NULL; |
| } |
| |
| static int nsp32_eh_host_reset(struct scsi_cmnd *SCpnt) |
| { |
| struct Scsi_Host *host = SCpnt->device->host; |
| unsigned int base = SCpnt->device->host->io_port; |
| nsp32_hw_data *data = (nsp32_hw_data *)host->hostdata; |
| |
| nsp32_msg(KERN_INFO, "Host Reset"); |
| nsp32_dbg(NSP32_DEBUG_BUSRESET, "SCpnt=0x%x", SCpnt); |
| |
| spin_lock_irq(SCpnt->device->host->host_lock); |
| |
| nsp32hw_init(data); |
| nsp32_write2(base, IRQ_CONTROL, IRQ_CONTROL_ALL_IRQ_MASK); |
| nsp32_do_bus_reset(data); |
| nsp32_write2(base, IRQ_CONTROL, 0); |
| |
| spin_unlock_irq(SCpnt->device->host->host_lock); |
| return SUCCESS; /* Host reset is succeeded at any time. */ |
| } |
| |
| |
| /************************************************************************** |
| * EEPROM handler |
| */ |
| |
| /* |
| * getting EEPROM parameter |
| */ |
| static int nsp32_getprom_param(nsp32_hw_data *data) |
| { |
| int vendor = data->pci_devid->vendor; |
| int device = data->pci_devid->device; |
| int ret, val, i; |
| |
| /* |
| * EEPROM checking. |
| */ |
| ret = nsp32_prom_read(data, 0x7e); |
| if (ret != 0x55) { |
| nsp32_msg(KERN_INFO, "No EEPROM detected: 0x%x", ret); |
| return FALSE; |
| } |
| ret = nsp32_prom_read(data, 0x7f); |
| if (ret != 0xaa) { |
| nsp32_msg(KERN_INFO, "Invalid number: 0x%x", ret); |
| return FALSE; |
| } |
| |
| /* |
| * check EEPROM type |
| */ |
| if (vendor == PCI_VENDOR_ID_WORKBIT && |
| device == PCI_DEVICE_ID_WORKBIT_STANDARD) { |
| ret = nsp32_getprom_c16(data); |
| } else if (vendor == PCI_VENDOR_ID_WORKBIT && |
| device == PCI_DEVICE_ID_NINJASCSI_32BIB_LOGITEC) { |
| ret = nsp32_getprom_at24(data); |
| } else if (vendor == PCI_VENDOR_ID_WORKBIT && |
| device == PCI_DEVICE_ID_NINJASCSI_32UDE_MELCO ) { |
| ret = nsp32_getprom_at24(data); |
| } else { |
| nsp32_msg(KERN_WARNING, "Unknown EEPROM"); |
| ret = FALSE; |
| } |
| |
| /* for debug : SPROM data full checking */ |
| for (i = 0; i <= 0x1f; i++) { |
| val = nsp32_prom_read(data, i); |
| nsp32_dbg(NSP32_DEBUG_EEPROM, |
| "rom address 0x%x : 0x%x", i, val); |
| } |
| |
| return ret; |
| } |
| |
| |
| /* |
| * AT24C01A (Logitec: LHA-600S), AT24C02 (Melco Buffalo: IFC-USLP) data map: |
| * |
| * ROMADDR |
| * 0x00 - 0x06 : Device Synchronous Transfer Period (SCSI ID 0 - 6) |
| * Value 0x0: ASYNC, 0x0c: Ultra-20M, 0x19: Fast-10M |
| * 0x07 : HBA Synchronous Transfer Period |
| * Value 0: AutoSync, 1: Manual Setting |
| * 0x08 - 0x0f : Not Used? (0x0) |
| * 0x10 : Bus Termination |
| * Value 0: Auto[ON], 1: ON, 2: OFF |
| * 0x11 : Not Used? (0) |
| * 0x12 : Bus Reset Delay Time (0x03) |
| * 0x13 : Bootable CD Support |
| * Value 0: Disable, 1: Enable |
| * 0x14 : Device Scan |
| * Bit 7 6 5 4 3 2 1 0 |
| * | <-----------------> |
| * | SCSI ID: Value 0: Skip, 1: YES |
| * |-> Value 0: ALL scan, Value 1: Manual |
| * 0x15 - 0x1b : Not Used? (0) |
| * 0x1c : Constant? (0x01) (clock div?) |
| * 0x1d - 0x7c : Not Used (0xff) |
| * 0x7d : Not Used? (0xff) |
| * 0x7e : Constant (0x55), Validity signature |
| * 0x7f : Constant (0xaa), Validity signature |
| */ |
| static int nsp32_getprom_at24(nsp32_hw_data *data) |
| { |
| int ret, i; |
| int auto_sync; |
| nsp32_target *target; |
| int entry; |
| |
| /* |
| * Reset time which is designated by EEPROM. |
| * |
| * TODO: Not used yet. |
| */ |
| data->resettime = nsp32_prom_read(data, 0x12); |
| |
| /* |
| * HBA Synchronous Transfer Period |
| * |
| * Note: auto_sync = 0: auto, 1: manual. Ninja SCSI HBA spec says |
| * that if auto_sync is 0 (auto), and connected SCSI devices are |
| * same or lower than 3, then transfer speed is set as ULTRA-20M. |
| * On the contrary if connected SCSI devices are same or higher |
| * than 4, then transfer speed is set as FAST-10M. |
| * |
| * I break this rule. The number of connected SCSI devices are |
| * only ignored. If auto_sync is 0 (auto), then transfer speed is |
| * forced as ULTRA-20M. |
| */ |
| ret = nsp32_prom_read(data, 0x07); |
| switch (ret) { |
| case 0: |
| auto_sync = TRUE; |
| break; |
| case 1: |
| auto_sync = FALSE; |
| break; |
| default: |
| nsp32_msg(KERN_WARNING, |
| "Unsupported Auto Sync mode. Fall back to manual mode."); |
| auto_sync = TRUE; |
| } |
| |
| if (trans_mode == ULTRA20M_MODE) { |
| auto_sync = TRUE; |
| } |
| |
| /* |
| * each device Synchronous Transfer Period |
| */ |
| for (i = 0; i < NSP32_HOST_SCSIID; i++) { |
| target = &data->target[i]; |
| if (auto_sync == TRUE) { |
| target->limit_entry = 0; /* set as ULTRA20M */ |
| } else { |
| ret = nsp32_prom_read(data, i); |
| entry = nsp32_search_period_entry(data, target, ret); |
| if (entry < 0) { |
| /* search failed... set maximum speed */ |
| entry = 0; |
| } |
| target->limit_entry = entry; |
| } |
| } |
| |
| return TRUE; |
| } |
| |
| |
| /* |
| * C16 110 (I-O Data: SC-NBD) data map: |
| * |
| * ROMADDR |
| * 0x00 - 0x06 : Device Synchronous Transfer Period (SCSI ID 0 - 6) |
| * Value 0x0: 20MB/S, 0x1: 10MB/S, 0x2: 5MB/S, 0x3: ASYNC |
| * 0x07 : 0 (HBA Synchronous Transfer Period: Auto Sync) |
| * 0x08 - 0x0f : Not Used? (0x0) |
| * 0x10 : Transfer Mode |
| * Value 0: PIO, 1: Busmater |
| * 0x11 : Bus Reset Delay Time (0x00-0x20) |
| * 0x12 : Bus Termination |
| * Value 0: Disable, 1: Enable |
| * 0x13 - 0x19 : Disconnection |
| * Value 0: Disable, 1: Enable |
| * 0x1a - 0x7c : Not Used? (0) |
| * 0x7d : Not Used? (0xf8) |
| * 0x7e : Constant (0x55), Validity signature |
| * 0x7f : Constant (0xaa), Validity signature |
| */ |
| static int nsp32_getprom_c16(nsp32_hw_data *data) |
| { |
| int ret, i; |
| nsp32_target *target; |
| int entry, val; |
| |
| /* |
| * Reset time which is designated by EEPROM. |
| * |
| * TODO: Not used yet. |
| */ |
| data->resettime = nsp32_prom_read(data, 0x11); |
| |
| /* |
| * each device Synchronous Transfer Period |
| */ |
| for (i = 0; i < NSP32_HOST_SCSIID; i++) { |
| target = &data->target[i]; |
| ret = nsp32_prom_read(data, i); |
| switch (ret) { |
| case 0: /* 20MB/s */ |
| val = 0x0c; |
| break; |
| case 1: /* 10MB/s */ |
| val = 0x19; |
| break; |
| case 2: /* 5MB/s */ |
| val = 0x32; |
| break; |
| case 3: /* ASYNC */ |
| val = 0x00; |
| break; |
| default: /* default 20MB/s */ |
| val = 0x0c; |
| break; |
| } |
| entry = nsp32_search_period_entry(data, target, val); |
| if (entry < 0 || trans_mode == ULTRA20M_MODE) { |
| /* search failed... set maximum speed */ |
| entry = 0; |
| } |
| target->limit_entry = entry; |
| } |
| |
| return TRUE; |
| } |
| |
| |
| /* |
| * Atmel AT24C01A (drived in 5V) serial EEPROM routines |
| */ |
| static int nsp32_prom_read(nsp32_hw_data *data, int romaddr) |
| { |
| int i, val; |
| |
| /* start condition */ |
| nsp32_prom_start(data); |
| |
| /* device address */ |
| nsp32_prom_write_bit(data, 1); /* 1 */ |
| nsp32_prom_write_bit(data, 0); /* 0 */ |
| nsp32_prom_write_bit(data, 1); /* 1 */ |
| nsp32_prom_write_bit(data, 0); /* 0 */ |
| nsp32_prom_write_bit(data, 0); /* A2: 0 (GND) */ |
| nsp32_prom_write_bit(data, 0); /* A1: 0 (GND) */ |
| nsp32_prom_write_bit(data, 0); /* A0: 0 (GND) */ |
| |
| /* R/W: W for dummy write */ |
| nsp32_prom_write_bit(data, 0); |
| |
| /* ack */ |
| nsp32_prom_write_bit(data, 0); |
| |
| /* word address */ |
| for (i = 7; i >= 0; i--) { |
| nsp32_prom_write_bit(data, ((romaddr >> i) & 1)); |
| } |
| |
| /* ack */ |
| nsp32_prom_write_bit(data, 0); |
| |
| /* start condition */ |
| nsp32_prom_start(data); |
| |
| /* device address */ |
| nsp32_prom_write_bit(data, 1); /* 1 */ |
| nsp32_prom_write_bit(data, 0); /* 0 */ |
| nsp32_prom_write_bit(data, 1); /* 1 */ |
| nsp32_prom_write_bit(data, 0); /* 0 */ |
| nsp32_prom_write_bit(data, 0); /* A2: 0 (GND) */ |
| nsp32_prom_write_bit(data, 0); /* A1: 0 (GND) */ |
| nsp32_prom_write_bit(data, 0); /* A0: 0 (GND) */ |
| |
| /* R/W: R */ |
| nsp32_prom_write_bit(data, 1); |
| |
| /* ack */ |
| nsp32_prom_write_bit(data, 0); |
| |
| /* data... */ |
| val = 0; |
| for (i = 7; i >= 0; i--) { |
| val += (nsp32_prom_read_bit(data) << i); |
| } |
| |
| /* no ack */ |
| nsp32_prom_write_bit(data, 1); |
| |
| /* stop condition */ |
| nsp32_prom_stop(data); |
| |
| return val; |
| } |
| |