tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#elif defined(CONFIG_AT91_DEBUG_LL_DBGU2)
17/* On sama5d4, use USART3 as low level serial console */
18#define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
19#else
20/* On sama5d2, use UART1 as low level serial console */
21#define AT91_DBGU 0xf8020000
22#endif
23
24#ifdef CONFIG_MMU
25#define AT91_IO_P2V(x) ((x) - 0x01000000)
26#else
27#define AT91_IO_P2V(x) (x)
28#endif
29
30#define AT91_DBGU_SR (0x14) /* Status Register */
31#define AT91_DBGU_THR (0x1c) /* Transmitter Holding Register */
32#define AT91_DBGU_TXRDY (1 << 1) /* Transmitter Ready */
33#define AT91_DBGU_TXEMPTY (1 << 9) /* Transmitter Empty */
34
35 .macro addruart, rp, rv, tmp
36 ldr \rp, =AT91_DBGU @ System peripherals (phys address)
37 ldr \rv, =AT91_IO_P2V(AT91_DBGU) @ System peripherals (virt address)
38 .endm
39
40 .macro senduart,rd,rx
41 strb \rd, [\rx, #(AT91_DBGU_THR)] @ Write to Transmitter Holding Register
42 .endm
43
44 .macro waituart,rd,rx
451001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
46 tst \rd, #AT91_DBGU_TXRDY @ DBGU_TXRDY = 1 when ready to transmit
47 beq 1001b
48 .endm
49
50 .macro busyuart,rd,rx
511001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
52 tst \rd, #AT91_DBGU_TXEMPTY @ DBGU_TXEMPTY = 1 when transmission complete
53 beq 1001b
54 .endm
55