diff options
Diffstat (limited to 'arch/mips/ath79/early_printk.c')
| -rw-r--r-- | arch/mips/ath79/early_printk.c | 76 |
1 files changed, 67 insertions, 9 deletions
diff --git a/arch/mips/ath79/early_printk.c b/arch/mips/ath79/early_printk.c index 7499b0e9df2..6a51ced7a29 100644 --- a/arch/mips/ath79/early_printk.c +++ b/arch/mips/ath79/early_printk.c @@ -1,7 +1,7 @@ /* - * Atheros AR71XX/AR724X/AR913X SoC early printk support + * Atheros AR7XXX/AR9XXX SoC early printk support * - * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org> + * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org> * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> * * This program is free software; you can redistribute it and/or modify it @@ -10,27 +10,85 @@ */ #include <linux/io.h> +#include <linux/errno.h> #include <linux/serial_reg.h> #include <asm/addrspace.h> +#include <asm/mach-ath79/ath79.h> #include <asm/mach-ath79/ar71xx_regs.h> +#include <asm/mach-ath79/ar933x_uart.h> -static inline void prom_wait_thre(void __iomem *base) +static void (*_prom_putchar) (unsigned char); + +static inline void prom_putchar_wait(void __iomem *reg, u32 mask, u32 val) { - u32 lsr; + u32 t; do { - lsr = __raw_readl(base + UART_LSR * 4); - if (lsr & UART_LSR_THRE) + t = __raw_readl(reg); + if ((t & mask) == val) break; } while (1); } -void prom_putchar(unsigned char ch) +static void prom_putchar_ar71xx(unsigned char ch) { void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); - prom_wait_thre(base); + prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); __raw_writel(ch, base + UART_TX * 4); - prom_wait_thre(base); + prom_putchar_wait(base + UART_LSR * 4, UART_LSR_THRE, UART_LSR_THRE); +} + +static void prom_putchar_ar933x(unsigned char ch) +{ + void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE)); + + prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, + AR933X_UART_DATA_TX_CSR); + __raw_writel(AR933X_UART_DATA_TX_CSR | ch, base + AR933X_UART_DATA_REG); + prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR, + AR933X_UART_DATA_TX_CSR); +} + +static void prom_putchar_dummy(unsigned char ch) +{ + /* nothing to do */ +} + +static void prom_putchar_init(void) +{ + void __iomem *base; + u32 id; + + base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE)); + id = __raw_readl(base + AR71XX_RESET_REG_REV_ID); + id &= REV_ID_MAJOR_MASK; + + switch (id) { + case REV_ID_MAJOR_AR71XX: + case REV_ID_MAJOR_AR7240: + case REV_ID_MAJOR_AR7241: + case REV_ID_MAJOR_AR7242: + case REV_ID_MAJOR_AR913X: + _prom_putchar = prom_putchar_ar71xx; + break; + + case REV_ID_MAJOR_AR9330: + case REV_ID_MAJOR_AR9331: + _prom_putchar = prom_putchar_ar933x; + break; + + default: + _prom_putchar = prom_putchar_dummy; + break; + } +} + +void prom_putchar(unsigned char ch) +{ + if (!_prom_putchar) + prom_putchar_init(); + + _prom_putchar(ch); } |