diff options
| author | James Morris <jmorris@namei.org> | 2011-03-08 10:55:06 +1100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2011-03-08 10:55:06 +1100 |
| commit | 1cc26bada9f6807814806db2f0d78792eecdac71 (patch) | |
| tree | 5509b5139db04af6c13db0a580c84116a4a54039 /arch/mips/ath79/early_printk.c | |
| parent | eae61f3c829439f8f9121b5cd48a14be04df451f (diff) | |
| parent | 214d93b02c4fe93638ad268613c9702a81ed9192 (diff) | |
Merge branch 'master'; commit 'v2.6.38-rc7' into next
Diffstat (limited to 'arch/mips/ath79/early_printk.c')
| -rw-r--r-- | arch/mips/ath79/early_printk.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/mips/ath79/early_printk.c b/arch/mips/ath79/early_printk.c new file mode 100644 index 000000000000..7499b0e9df26 --- /dev/null +++ b/arch/mips/ath79/early_printk.c @@ -0,0 +1,36 @@ +/* + * Atheros AR71XX/AR724X/AR913X SoC early printk support + * + * Copyright (C) 2008-2010 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 + * under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation. + */ + +#include <linux/io.h> +#include <linux/serial_reg.h> +#include <asm/addrspace.h> + +#include <asm/mach-ath79/ar71xx_regs.h> + +static inline void prom_wait_thre(void __iomem *base) +{ + u32 lsr; + + do { + lsr = __raw_readl(base + UART_LSR * 4); + if (lsr & UART_LSR_THRE) + break; + } while (1); +} + +void prom_putchar(unsigned char ch) +{ + void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE)); + + prom_wait_thre(base); + __raw_writel(ch, base + UART_TX * 4); + prom_wait_thre(base); +} |