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 str \rd, \rx 20 .endm 21 22 .macro load, rd, rx:vararg 23 ldr \rd, \rx 24 .endm 25#else 26 .macro store, rd, rx:vararg 27 strb \rd, \rx 28 .endm 29 30 .macro load, rd, rx:vararg 31 ldrb \rd, \rx 32 .endm 33#endif 34 35#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT 36 37 .macro senduart,rd,rx 38 store \rd, [\rx, #UART_TX << UART_SHIFT] 39 .endm 40 41 .macro busyuart,rd,rx 421002: load \rd, [\rx, #UART_LSR << UART_SHIFT] 43 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE 44 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE 45 bne 1002b 46 .endm 47 48 .macro waituart,rd,rx 49#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL 501001: load \rd, [\rx, #UART_MSR << UART_SHIFT] 51 tst \rd, #UART_MSR_CTS 52 beq 1001b 53#endif 54 .endm 55