1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
7 */
8
9 #include <linux/mm.h>
10 #include <linux/io.h>
11 #include <linux/serial_reg.h>
12 #include <asm/setup.h>
13
14 #include "devices.h"
15 #include "ar2315_regs.h"
16 #include "ar5312_regs.h"
17
18 static inline void prom_uart_wr(void __iomem *base, unsigned reg,
19 unsigned char ch)
20 {
21 __raw_writel(ch, base + 4 * reg);
22 }
23
24 static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
25 {
26 return __raw_readl(base + 4 * reg);
27 }
28
29 void prom_putchar(char ch)
30 {
31 static void __iomem *base;
32
33 if (unlikely(base == NULL)) {
34 if (is_ar2315())
35 base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
36 else
37 base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
38 }
39
40 while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
41 ;
42 prom_uart_wr(base, UART_TX, (unsigned char)ch);
43 while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
44 ;
45 }
46
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