diff options
Diffstat (limited to 'target/linux/ramips/files-3.7/arch/mips/ralink/rt3883/early_printk.c')
-rw-r--r-- | target/linux/ramips/files-3.7/arch/mips/ralink/rt3883/early_printk.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/target/linux/ramips/files-3.7/arch/mips/ralink/rt3883/early_printk.c b/target/linux/ramips/files-3.7/arch/mips/ralink/rt3883/early_printk.c new file mode 100644 index 0000000000..e3bf7ba339 --- /dev/null +++ b/target/linux/ramips/files-3.7/arch/mips/ralink/rt3883/early_printk.c @@ -0,0 +1,29 @@ +/* + * Ralink RT3662/RT3883 SoC early printk support + * + * Copyright (C) 2011-2012 Gabor Juhos <juhosg@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-ralink/rt3883_regs.h> + +#define UART_READ(r) \ + __raw_readl((void __iomem *)(KSEG1ADDR(RT3883_UART1_BASE) + 4 * (r))) + +#define UART_WRITE(r, v) \ + __raw_writel((v), (void __iomem *)(KSEG1ADDR(RT3883_UART1_BASE) + 4 * (r))) + +void prom_putchar(unsigned char ch) +{ + while (((UART_READ(RT3883_UART_REG_LSR)) & UART_LSR_THRE) == 0); + UART_WRITE(RT3883_UART_REG_TX, ch); + while (((UART_READ(RT3883_UART_REG_LSR)) & UART_LSR_THRE) == 0); +} |