1/* 2 * arch/arm/include/debug/8250.S 3 * 4 * Copyright (C) 1994-2013 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10#include <linux/serial_reg.h> 11 12 .macro addruart, rp, rv, tmp 13 ldr \rp, =CONFIG_DEBUG_UART_PHYS 14 ldr \rv, =CONFIG_DEBUG_UART_VIRT 15 .endm 16 17#ifdef CONFIG_DEBUG_UART_8250_WORD 18 .macro store, rd, rx:vararg 19 ARM_BE8(rev \rd, \rd) 20 str \rd, \rx 21 ARM_BE8(rev \rd, \rd) 22 .endm 23 24 .macro load, rd, rx:vararg 25 ldr \rd, \rx 26 ARM_BE8(rev \rd, \rd) 27 .endm 28#else 29 .macro store, rd, rx:vararg 30 strb \rd, \rx 31 .endm 32 33 .macro load, rd, rx:vararg 34 ldrb \rd, \rx 35 .endm 36#endif 37 38#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT 39 40 .macro senduart,rd,rx 41 store \rd, [\rx, #UART_TX << UART_SHIFT] 42 .endm 43 44 .macro busyuart,rd,rx 451002: load \rd, [\rx, #UART_LSR << UART_SHIFT] 46 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE 47 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE 48 bne 1002b 49 .endm 50 51 .macro waituart,rd,rx 52#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL 531001: load \rd, [\rx, #UART_MSR << UART_SHIFT] 54 tst \rd, #UART_MSR_CTS 55 beq 1001b 56#endif 57 .endm 58