Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2003-2005 SAN People
3 *
4 * Debugging macro include header
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10*/
11
12#if defined(CONFIG_AT91_DEBUG_LL_DBGU0)
13#define AT91_DBGU 0xfffff200 /* AT91_BASE_DBGU0 */
14#elif defined(CONFIG_AT91_DEBUG_LL_DBGU1)
15#define AT91_DBGU 0xffffee00 /* AT91_BASE_DBGU1 */
16#else
17/* On sama5d4, use USART3 as low level serial console */
18#define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
19#endif
20
21#ifdef CONFIG_MMU
22#define AT91_IO_P2V(x) ((x) - 0x01000000)
23#else
24#define AT91_IO_P2V(x) (x)
25#endif
26
27#define AT91_DBGU_SR (0x14) /* Status Register */
28#define AT91_DBGU_THR (0x1c) /* Transmitter Holding Register */
29#define AT91_DBGU_TXRDY (1 << 1) /* Transmitter Ready */
30#define AT91_DBGU_TXEMPTY (1 << 9) /* Transmitter Empty */
31
32 .macro addruart, rp, rv, tmp
33 ldr \rp, =AT91_DBGU @ System peripherals (phys address)
34 ldr \rv, =AT91_IO_P2V(AT91_DBGU) @ System peripherals (virt address)
35 .endm
36
37 .macro senduart,rd,rx
38 strb \rd, [\rx, #(AT91_DBGU_THR)] @ Write to Transmitter Holding Register
39 .endm
40
41 .macro waituart,rd,rx
421001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
43 tst \rd, #AT91_DBGU_TXRDY @ DBGU_TXRDY = 1 when ready to transmit
44 beq 1001b
45 .endm
46
47 .macro busyuart,rd,rx
481001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
49 tst \rd, #AT91_DBGU_TXEMPTY @ DBGU_TXEMPTY = 1 when transmission complete
50 beq 1001b
51 .endm
52