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 25 .align 2 26omap_uart_phys: .word 0 27omap_uart_virt: .word 0 28omap_uart_lsr: .word 0 29 .popsection 30 31 .macro addruart, rp, rv, tmp 32 33 /* Use omap_uart_phys/virt if already configured */ 3410: adr \rp, 99f @ get effective addr of 99f 35 ldr \rv, [\rp] @ get absolute addr of 99f 36 sub \rv, \rv, \rp @ offset between the two 37 ldr \rp, [\rp, #4] @ abs addr of omap_uart_phys 38 sub \tmp, \rp, \rv @ make it effective 39 ldr \rp, [\tmp, #0] @ omap_uart_phys 40 ldr \rv, [\tmp, #4] @ omap_uart_virt 41 cmp \rp, #0 @ is port configured? 42 cmpne \rv, #0 43 bne 100f @ already configured 44 45 /* Configure the UART offset from the phys/virt base */ 46#ifdef CONFIG_DEBUG_ZOOM_UART 47 ldr \rp, =ZOOM_UART_BASE 48 str \rp, [\tmp, #0] @ omap_uart_phys 49 ldr \rp, =ZOOM_UART_VIRT 50 str \rp, [\tmp, #4] @ omap_uart_virt 51 mov \rp, #(UART_LSR << ZOOM_PORT_SHIFT) 52 str \rp, [\tmp, #8] @ omap_uart_lsr 53#endif 54 b 10b 55 56 .align 5799: .word . 58 .word omap_uart_phys 59 .ltorg 60 61100: /* Pass the UART_LSR reg address */ 62 ldr \tmp, [\tmp, #8] @ omap_uart_lsr 63 add \rp, \rp, \tmp 64 add \rv, \rv, \tmp 65 .endm 66 67 .macro senduart,rd,rx 68 orr \rd, \rd, \rx, lsl #24 @ preserve LSR reg offset 69 bic \rx, \rx, #0xff @ get base (THR) reg address 70 strb \rd, [\rx] @ send lower byte of rd 71 orr \rx, \rx, \rd, lsr #24 @ restore original rx (LSR) 72 bic \rd, \rd, #(0xff << 24) @ restore original rd 73 .endm 74 75 .macro busyuart,rd,rx 761001: ldrb \rd, [\rx] @ rx contains UART_LSR address 77 and \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 78 teq \rd, #(UART_LSR_TEMT | UART_LSR_THRE) 79 bne 1001b 80 .endm 81 82 .macro waituart,rd,rx 83 .endm 84