diff options
| author | Gabor Juhos <juhosg@openwrt.org> | 2011-01-04 21:28:14 +0100 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2011-01-18 19:30:24 +0100 |
| commit | d4a67d9dc8a5a80c4ec1814791af8c0252c158b8 (patch) | |
| tree | 28c9797f2ec5bf46325e1d5dd7db675ac0ac6713 /arch/mips/ath79/early_printk.c | |
| parent | 94bb0c1ab293c298a8852e4f10c4215bad6daa9b (diff) | |
MIPS: Add initial support for the Atheros AR71XX/AR724X/AR931X SoCs
This patch adds initial support for various Atheros SoCs based on the
MIPS 24Kc core. The following models are supported at the moment:
- AR7130
- AR7141
- AR7161
- AR9130
- AR9132
- AR7240
- AR7241
- AR7242
The current patch contains minimal support only, but the resulting
kernel can boot into user-space with using of an initramfs image on
various boards which are using these SoCs. Support for more built-in
devices and individual boards will be implemented in further patches.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Luis R. Rodriguez <lrodriguez@atheros.com>
Cc: Cliff Holden <Cliff.Holden@Atheros.com>
Cc: Kathy Giori <Kathy.Giori@Atheros.com>
Patchwork: https://patchwork.linux-mips.org/patch/1947/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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); +} |