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 |
42 | 1002: 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 |
52 | 1001: load \rd, [\rx, #UART_MSR << UART_SHIFT] |
53 | tst \rd, #UART_MSR_CTS |
54 | beq 1001b |
55 | .endm |
56 | |