1/*
2 * xen/arch/arm/arm32/debug-exynos4210.inc
3 *
4 * Exynos 5 specific debug code
5 *
6 * Copyright (c) 2013 Citrix Systems.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 */
18
19#include <asm/exynos4210-uart.h>
20
21/*
22 * Exynos 5 UART wait UART to be ready to transmit
23 * rb: register which contains the UART base address
24 * rc: scratch register
25 */
26.macro early_uart_ready rb rc
271:
28        ldr   \rc, [\rb, #UTRSTAT]   /* <- UTRSTAT (Flag register) */
29        tst   \rc, #UTRSTAT_TXFE     /* Check BUSY bit */
30        beq   1b                     /* Wait for the UART to be ready */
31.endm
32
33/*
34 * Exynos 5 UART transmit character
35 * rb: register which contains the UART base address
36 * rt: register which contains the character to transmit
37 */
38.macro early_uart_transmit rb rt
39        str   \rt, [\rb, #UTXH]      /* -> UTXH (Data Register) */
40.endm
41
42/*
43 * Local variables:
44 * mode: ASM
45 * indent-tabs-mode: nil
46 * End:
47 */
48