Commit | Line | Data |
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5fff610b JC |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify it | |
3 | * under the terms of the GNU General Public License version 2 as published | |
4 | * by the Free Software Foundation. | |
5 | * | |
6 | * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org> | |
7 | */ | |
8 | ||
9 | #include <linux/io.h> | |
10 | #include <linux/serial_reg.h> | |
11 | ||
12 | #include <asm/addrspace.h> | |
13 | ||
14 | #define EARLY_UART_BASE 0x10000c00 | |
15 | ||
16 | #define UART_REG_RX 0x00 | |
17 | #define UART_REG_TX 0x04 | |
18 | #define UART_REG_IER 0x08 | |
19 | #define UART_REG_IIR 0x0c | |
20 | #define UART_REG_FCR 0x10 | |
21 | #define UART_REG_LCR 0x14 | |
22 | #define UART_REG_MCR 0x18 | |
23 | #define UART_REG_LSR 0x1c | |
24 | ||
25 | static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE); | |
26 | ||
27 | static inline void uart_w32(u32 val, unsigned reg) | |
28 | { | |
29 | __raw_writel(val, uart_membase + reg); | |
30 | } | |
31 | ||
32 | static inline u32 uart_r32(unsigned reg) | |
33 | { | |
34 | return __raw_readl(uart_membase + reg); | |
35 | } | |
36 | ||
37 | void prom_putchar(unsigned char ch) | |
38 | { | |
39 | while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0) | |
40 | ; | |
41 | uart_w32(ch, UART_REG_TX); | |
42 | while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0) | |
43 | ; | |
44 | } |