8250.S (1068B)
1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * arch/arm/include/debug/8250.S 4 * 5 * Copyright (C) 1994-2013 Russell King 6 */ 7#include <linux/serial_reg.h> 8 9 .macro addruart, rp, rv, tmp 10 ldr \rp, =CONFIG_DEBUG_UART_PHYS 11 ldr \rv, =CONFIG_DEBUG_UART_VIRT 12 .endm 13 14#ifdef CONFIG_DEBUG_UART_8250_WORD 15 .macro store, rd, rx:vararg 16 ARM_BE8(rev \rd, \rd) 17 str \rd, \rx 18 ARM_BE8(rev \rd, \rd) 19 .endm 20 21 .macro load, rd, rx:vararg 22 ldr \rd, \rx 23 ARM_BE8(rev \rd, \rd) 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 waituarttxrdy,rd,rx 49 .endm 50 51 .macro waituartcts,rd,rx 521001: load \rd, [\rx, #UART_MSR << UART_SHIFT] 53 tst \rd, #UART_MSR_CTS 54 beq 1001b 55 .endm