| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * arch/arm/include/debug/8250.S |
| * |
| * Copyright (C) 1994-2013 Russell King |
| */ |
| #include <linux/serial_reg.h> |
| |
| .macro addruart, rp, rv, tmp |
| ldr \rp, =CONFIG_DEBUG_UART_PHYS |
| ldr \rv, =CONFIG_DEBUG_UART_VIRT |
| .endm |
| |
| #ifdef CONFIG_DEBUG_UART_8250_WORD |
| .macro store, rd, rx:vararg |
| ARM_BE8(rev \rd, \rd) |
| str \rd, \rx |
| ARM_BE8(rev \rd, \rd) |
| .endm |
| |
| .macro load, rd, rx:vararg |
| ldr \rd, \rx |
| ARM_BE8(rev \rd, \rd) |
| .endm |
| #else |
| .macro store, rd, rx:vararg |
| strb \rd, \rx |
| .endm |
| |
| .macro load, rd, rx:vararg |
| ldrb \rd, \rx |
| .endm |
| #endif |
| |
| #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT |
| |
| .macro senduart,rd,rx |
| store \rd, [\rx, #UART_TX << UART_SHIFT] |
| .endm |
| |
| .macro busyuart,rd,rx |
| 1002: load \rd, [\rx, #UART_LSR << UART_SHIFT] |
| and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| teq \rd, #UART_LSR_TEMT | UART_LSR_THRE |
| bne 1002b |
| .endm |
| |
| .macro waituart,rd,rx |
| #ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL |
| 1001: load \rd, [\rx, #UART_MSR << UART_SHIFT] |
| tst \rd, #UART_MSR_CTS |
| beq 1001b |
| #endif |
| .endm |
