1/* 2 * Debugging macro include header 3 * 4 * Copyright (C) 1994-1999 Russell King 5 * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11*/ 12 13#include <linux/serial_reg.h> 14 15/* External port on Zoom2/3 */ 16#define ZOOM_UART_BASE 0x10000000 17#define ZOOM_UART_VIRT 0xfa400000 18 19#define OMAP_PORT_SHIFT 2 20#define ZOOM_PORT_SHIFT 1 21 22#define UART_OFFSET(addr) ((addr) & 0x00ffffff) 23 24 .pushsection .data 25omap_uart_phys: .word 0 26omap_uart_virt: .word 0 27omap_uart_lsr: .word 0 28 .popsection 29 30 .macro addruart, rp, rv, tmp 31 32 /* Use omap_uart_phys/virt if already configured */ 3310: adr \rp, 99f @ get effective addr of 99f 34 ldr \rv, [\rp] @ get absolute addr of 99f 35 sub \rv, \rv, \rp @ offset between the two 36 ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys 37 sub \tmp, \rp, \rv @ make it effective 38 ldr \rp, [\tmp, #0] @ omap_uart_phys 39 ldr \rv, [\tmp, #4] @ omap_uart_virt 40 cmp \rp, #0 @ is port configured? 41 cmpne \rv, #0 42 bne 100f @ already configured 43 44 /* Configure the UART offset from the phys/virt base */ 45#ifdef CONFIG_DEBUG_ZOOM_UART 46 ldr \rp, =ZOOM_UART_BASE 47 str \rp, [\tmp, #0] @ omap_uart_phys 48 ldr \rp, =ZOOM_UART_VIRT 49 str \rp, [\tmp, #4] @ omap_uart_virt 50 mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT) 51 str \rp, [\tmp, #8] @ omap_uart_lsr 52#endif 53 b 10b 54 55 .align 5699: .word . 57 .word omap_uart_phys 58 .ltorg 59 60100: /* Pass the UART_LSR reg address */ 61 ldr \tmp, [\tmp, #8] @ omap_uart_lsr 62 add \rp, \rp, \tmp 63 add \rv, \rv, \tmp 64 .endm 65 66 .macro senduart,rd,rx 67 orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset 68 bic \rx, \rx, #0xff @ get base (THR) reg address 69 strb \rd, [\rx] @ send lower byte of rd 70 orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR) 71 bic \rd, \rd, #(0xff << 24) @ restore original rd 72 .endm 73 74 .macro busyuart,rd,rx 751001: ldrb \rd, [\rx] @ rx contains UART_LSR address 76 and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 77 teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 78 bne 1001b 79 .endm 80 81 .macro waituart,rd,rx 82 .endm 83