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#define AT91_DBGU_SR (0x14) /* Status Register */
13#define AT91_DBGU_THR (0x1c) /* Transmitter Holding Register */
14#define AT91_DBGU_TXRDY (1 << 1) /* Transmitter Ready */
15#define AT91_DBGU_TXEMPTY (1 << 9) /* Transmitter Empty */
16
17 .macro addruart, rp, rv, tmp
18 ldr \rp, =CONFIG_DEBUG_UART_PHYS @ System peripherals (phys address)
19 ldr \rv, =CONFIG_DEBUG_UART_VIRT @ System peripherals (virt address)
20 .endm
21
22 .macro senduart,rd,rx
23 strb \rd, [\rx, #(AT91_DBGU_THR)] @ Write to Transmitter Holding Register
24 .endm
25
26 .macro waituart,rd,rx
271001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
28 tst \rd, #AT91_DBGU_TXRDY @ DBGU_TXRDY = 1 when ready to transmit
29 beq 1001b
30 .endm
31
32 .macro busyuart,rd,rx
331001: ldr \rd, [\rx, #(AT91_DBGU_SR)] @ Read Status Register
34 tst \rd, #AT91_DBGU_TXEMPTY @ DBGU_TXEMPTY = 1 when transmission complete
35 beq 1001b
36 .endm
37