projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 5b4500d1 JC |
14 | #ifdef CONFIG_SOC_RT288X |
| 15 | #define EARLY_UART_BASE 0x300c00 | |
| 16 | #else | |
| 5fff610b | 17 | #define EARLY_UART_BASE 0x10000c00 |
| 5b4500d1 | 18 | #endif |
| 5fff610b JC |
19 | |
| 20 | #define UART_REG_RX 0x00 | |
| 21 | #define UART_REG_TX 0x04 | |
| 22 | #define UART_REG_IER 0x08 | |
| 23 | #define UART_REG_IIR 0x0c | |
| 24 | #define UART_REG_FCR 0x10 | |
| 25 | #define UART_REG_LCR 0x14 | |
| 26 | #define UART_REG_MCR 0x18 | |
| 27 | #define UART_REG_LSR 0x1c | |
| 28 | ||
| 29 | static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE); | |
| 30 | ||
| 31 | static inline void uart_w32(u32 val, unsigned reg) | |
| 32 | { | |
| 33 | __raw_writel(val, uart_membase + reg); | |
| 34 | } | |
| 35 | ||
| 36 | static inline u32 uart_r32(unsigned reg) | |
| 37 | { | |
| 38 | return __raw_readl(uart_membase + reg); | |
| 39 | } | |
| 40 | ||
| 41 | void prom_putchar(unsigned char ch) | |
| 42 | { | |
| 43 | while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0) | |
| 44 | ; | |
| 45 | uart_w32(ch, UART_REG_TX); | |
| 46 | while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0) | |
| 47 | ; | |
| 48 | } |