projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d4a67d9d | 1 | /* |
| 0bd3acdf | 2 | * Atheros AR7XXX/AR9XXX SoC early printk support |
| d4a67d9d | 3 | * |
| 0bd3acdf | 4 | * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> |
| d4a67d9d GJ |
5 | * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify it | |
| 8 | * under the terms of the GNU General Public License version 2 as published | |
| 9 | * by the Free Software Foundation. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/io.h> | |
| 0bd3acdf | 13 | #include <linux/errno.h> |
| d4a67d9d GJ |
14 | #include <linux/serial_reg.h> |
| 15 | #include <asm/addrspace.h> | |
| 16 | ||
| 0bd3acdf | 17 | #include <asm/mach-ath79/ath79.h> |
| d4a67d9d | 18 | #include <asm/mach-ath79/ar71xx_regs.h> |
| 0bd3acdf | 19 | #include <asm/mach-ath79/ar933x_uart.h> |
| d4a67d9d | 20 | |
| 0bd3acdf GJ |
21 | static void (*_prom_putchar) (unsigned char); |
| 22 | ||
| 23 | static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val) | |
| d4a67d9d | 24 | { |
| 0bd3acdf | 25 | u32 t; |
| d4a67d9d GJ |
26 | |
| 27 | do { | |
| 0bd3acdf GJ |
28 | t = __raw_readl(reg); |
| 29 | if ((t & mask) == val) | |
| d4a67d9d GJ |
30 | break; |
| 31 | } while (1); | |
| 32 | } | |
| 33 | ||
| 0bd3acdf | 34 | static void prom_putchar_ar71xx(unsigned char ch) |
| d4a67d9d GJ |
35 | { |
| 36 | void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); | |
| 37 | ||
| 0bd3acdf | 38 | prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); |
| d4a67d9d | 39 | __raw_writel(ch, base + UART_TX * 4); |
| 0bd3acdf GJ |
40 | prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); |
| 41 | } | |
| 42 | ||
| 43 | static void prom_putchar_ar933x(unsigned char ch) | |
| 44 | { | |
| 45 | void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE)); | |
| 46 | ||
| 47 | prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, | |
| 48 | AR933X_UART_DATA_TX_CSR); | |
| 49 | __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG); | |
| 50 | prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, | |
| 51 | AR933X_UART_DATA_TX_CSR); | |
| 52 | } | |
| 53 | ||
| 54 | static void prom_putchar_dummy(unsigned char ch) | |
| 55 | { | |
| 56 | /* nothing to do */ | |
| 57 | } | |
| 58 | ||
| 59 | static void prom_putchar_init(void) | |
| 60 | { | |
| 61 | void __iomem *base; | |
| 62 | u32 id; | |
| 63 | ||
| 64 | base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE)); | |
| 65 | id = __raw_readl(base + AR71XX_RESET_REG_REV_ID); | |
| 66 | id &= REV_ID_MAJOR_MASK; | |
| 67 | ||
| 68 | switch (id) { | |
| 69 | case REV_ID_MAJOR_AR71XX: | |
| 70 | case REV_ID_MAJOR_AR7240: | |
| 71 | case REV_ID_MAJOR_AR7241: | |
| 72 | case REV_ID_MAJOR_AR7242: | |
| 73 | case REV_ID_MAJOR_AR913X: | |
| 74 | _prom_putchar = prom_putchar_ar71xx; | |
| 75 | break; | |
| 76 | ||
| 77 | case REV_ID_MAJOR_AR9330: | |
| 78 | case REV_ID_MAJOR_AR9331: | |
| 79 | _prom_putchar = prom_putchar_ar933x; | |
| 80 | break; | |
| 81 | ||
| 82 | default: | |
| 83 | _prom_putchar = prom_putchar_dummy; | |
| 84 | break; | |
| 85 | } | |
| 86 | } | |
| 87 | ||
| 88 | void prom_putchar(unsigned char ch) | |
| 89 | { | |
| 90 | if (!_prom_putchar) | |
| 91 | prom_putchar_init(); | |
| 92 | ||
| 93 | _prom_putchar(ch); | |
| d4a67d9d | 94 | } |