diff options
Diffstat (limited to 'arch/arm/include/debug/8250.S')
| -rw-r--r-- | arch/arm/include/debug/8250.S | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/arch/arm/include/debug/8250.S b/arch/arm/include/debug/8250.S new file mode 100644 index 000000000..e3692a37c --- /dev/null +++ b/arch/arm/include/debug/8250.S @@ -0,0 +1,55 @@ +/* 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 waituarttxrdy,rd,rx + .endm + + .macro waituartcts,rd,rx +1001: load \rd, [\rx, #UART_MSR << UART_SHIFT] + tst \rd, #UART_MSR_CTS + beq 1001b + .endm |