1/* 2 * arch/arm/include/debug/8250.S 3 * 4 * Copyright (C) 1994-2013 Russell King 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8#include <linux/serial_reg.h> 9 10 .macro addruart, rp, rv, tmp 11 ldr \rp, =CONFIG_DEBUG_UART_PHYS 12 ldr \rv, =CONFIG_DEBUG_UART_VIRT 13 .endm 14 15#ifdef CONFIG_DEBUG_UART_8250_WORD 16 .macro store, rd, rx:vararg 17 str \rd, \rx 18 .endm 19 20 .macro load, rd, rx:vararg 21 ldr \rd, \rx 22 .endm 23#else 24 .macro store, rd, rx:vararg 25 strb \rd, \rx 26 .endm 27 28 .macro load, rd, rx:vararg 29 ldrb \rd, \rx 30 .endm 31#endif 32 33#define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT 34 35 .macro senduart,rd,rx 36 store \rd, [\rx, #UART_TX << UART_SHIFT] 37 .endm 38 39 .macro busyuart,rd,rx 401002: load \rd, [\rx, #UART_LSR << UART_SHIFT] 41 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE 42 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE 43 bne 1002b 44 .endm 45 46 .macro waituart,rd,rx 47#ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL 481001: load \rd, [\rx, #UART_MSR << UART_SHIFT] 49 tst \rd, #UART_MSR_CTS 50 beq 1001b 51#endif 52 .endm 53