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8aaa7278 SR |
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 | ||
13 | #include "devices.h" | |
14 | #include "ar2315_regs.h" | |
15 | #include "ar5312_regs.h" | |
16 | ||
17 | static inline void prom_uart_wr(void __iomem *base, unsigned reg, | |
18 | unsigned char ch) | |
19 | { | |
20 | __raw_writel(ch, base + 4 * reg); | |
21 | } | |
22 | ||
23 | static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg) | |
24 | { | |
25 | return __raw_readl(base + 4 * reg); | |
26 | } | |
27 | ||
28 | void prom_putchar(unsigned char ch) | |
29 | { | |
30 | static void __iomem *base; | |
31 | ||
32 | if (unlikely(base == NULL)) { | |
33 | if (is_ar2315()) | |
34 | base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE)); | |
35 | else | |
36 | base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE)); | |
37 | } | |
38 | ||
39 | while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) | |
40 | ; | |
41 | prom_uart_wr(base, UART_TX, ch); | |
42 | while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) | |
43 | ; | |
44 | } |