| /* |
| * Debugging macro include header |
| * |
| * Copyright (C) 1994-1999 Russell King |
| * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks |
| * |
| * 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/serial_reg.h> |
| |
| /* External port on Zoom2/3 */ |
| #define ZOOM_UART_BASE 0x10000000 |
| #define ZOOM_UART_VIRT 0xfa400000 |
| |
| #define OMAP_PORT_SHIFT 2 |
| #define ZOOM_PORT_SHIFT 1 |
| |
| #define UART_OFFSET(addr) ((addr) & 0x00ffffff) |
| |
| .pushsection .data |
| .align 2 |
| omap_uart_phys: .word 0 |
| omap_uart_virt: .word 0 |
| omap_uart_lsr: .word 0 |
| .popsection |
| |
| .macro addruart, rp, rv, tmp |
| |
| /* Use omap_uart_phys/virt if already configured */ |
| 10: adr \rp, 99f @ get effective addr of 99f |
| ldr \rv, [\rp] @ get absolute addr of 99f |
| sub \rv, \rv, \rp @ offset between the two |
| ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys |
| sub \tmp, \rp, \rv @ make it effective |
| ldr \rp, [\tmp, #0] @ omap_uart_phys |
| ldr \rv, [\tmp, #4] @ omap_uart_virt |
| cmp \rp, #0 @ is port configured? |
| cmpne \rv, #0 |
| bne 100f @ already configured |
| |
| /* Configure the UART offset from the phys/virt base */ |
| #ifdef CONFIG_DEBUG_ZOOM_UART |
| ldr \rp, =ZOOM_UART_BASE |
| str \rp, [\tmp, #0] @ omap_uart_phys |
| ldr \rp, =ZOOM_UART_VIRT |
| str \rp, [\tmp, #4] @ omap_uart_virt |
| mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT) |
| str \rp, [\tmp, #8] @ omap_uart_lsr |
| #endif |
| b 10b |
| |
| .align |
| 99: .word . |
| .word omap_uart_phys |
| .ltorg |
| |
| 100: /* Pass the UART_LSR reg address */ |
| ldr \tmp, [\tmp, #8] @ omap_uart_lsr |
| add \rp, \rp, \tmp |
| add \rv, \rv, \tmp |
| .endm |
| |
| .macro senduart,rd,rx |
| orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset |
| bic \rx, \rx, #0xff @ get base (THR) reg address |
| strb \rd, [\rx] @ send lower byte of rd |
| orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR) |
| bic \rd, \rd, #(0xff << 24) @ restore original rd |
| .endm |
| |
| .macro busyuart,rd,rx |
| 1001: ldrb \rd, [\rx] @ rx contains UART_LSR address |
| and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE) |
| teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE) |
| bne 1001b |
| .endm |
| |
| .macro waituart,rd,rx |
| .endm |
