tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Early serial debug output macro for Keystone SOCs
3 *
4 * Copyright 2013 Texas Instruments, Inc.
5 * Santosh Shilimkar <santosh.shilimkar@ti.com>
6 *
7 * Based on RMKs low level debug code.
8 * Copyright (C) 1994-1999 Russell King
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/serial_reg.h>
16
17#define UART_SHIFT 2
18#if defined(CONFIG_DEBUG_KEYSTONE_UART0)
19#define UART_PHYS 0x02530c00
20#define UART_VIRT 0xfeb30c00
21#elif defined(CONFIG_DEBUG_KEYSTONE_UART1)
22#define UART_PHYS 0x02531000
23#define UART_VIRT 0xfeb31000
24#endif
25
26 .macro addruart, rp, rv, tmp
27 ldr \rv, =UART_VIRT @ physical base address
28 ldr \rp, =UART_PHYS @ virtual base address
29 .endm
30
31 .macro senduart,rd,rx
32 str \rd, [\rx, #UART_TX << UART_SHIFT]
33 .endm
34
35 .macro busyuart,rd,rx
361002: ldr \rd, [\rx, #UART_LSR << UART_SHIFT]
37 and \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
38 teq \rd, #UART_LSR_TEMT | UART_LSR_THRE
39 bne 1002b
40 .endm
41
42 .macro waituart,rd,rx
43 .endm