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| author | Sergey Ryazanov <ryazanov.s.a@gmail.com> | 2014-10-29 02:18:42 +0300 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2014-11-24 09:45:27 +0300 |
| commit | 8aaa7278c0c98a77ec36e1fed7d9bede58164a26 (patch) | |
| tree | f4a1aa46b46f55d627d1d30f4a9e1f990f922a9a /arch/mips | |
| parent | 1753e74ed8fa3235174d5baa3421cbf8d693a42d (diff) | |
| download | linux-8aaa7278c0c98a77ec36e1fed7d9bede58164a26.tar.xz | |
MIPS: ath25: add early printk support
Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8241/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
| -rw-r--r-- | arch/mips/Kconfig | 1 | ||||
| -rw-r--r-- | arch/mips/ath25/Makefile | 2 | ||||
| -rw-r--r-- | arch/mips/ath25/early_printk.c | 44 |
3 files changed, 47 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 656916810aae..3348989008b5 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -107,6 +107,7 @@ config ATH25 select SYS_HAS_CPU_MIPS32_R1 select SYS_SUPPORTS_BIG_ENDIAN select SYS_SUPPORTS_32BIT_KERNEL + select SYS_HAS_EARLY_PRINTK help Support for Atheros AR231x and Atheros AR531x based boards diff --git a/arch/mips/ath25/Makefile b/arch/mips/ath25/Makefile index 201b7d412902..eabad7da446a 100644 --- a/arch/mips/ath25/Makefile +++ b/arch/mips/ath25/Makefile @@ -10,5 +10,7 @@ obj-y += board.o prom.o devices.o +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o + obj-$(CONFIG_SOC_AR5312) += ar5312.o obj-$(CONFIG_SOC_AR2315) += ar2315.o diff --git a/arch/mips/ath25/early_printk.c b/arch/mips/ath25/early_printk.c new file mode 100644 index 000000000000..36035b628161 --- /dev/null +++ b/arch/mips/ath25/early_printk.c @@ -0,0 +1,44 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> + */ + +#include <linux/mm.h> +#include <linux/io.h> +#include <linux/serial_reg.h> + +#include "devices.h" +#include "ar2315_regs.h" +#include "ar5312_regs.h" + +static inline void prom_uart_wr(void __iomem *base, unsigned reg, + unsigned char ch) +{ + __raw_writel(ch, base + 4 * reg); +} + +static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg) +{ + return __raw_readl(base + 4 * reg); +} + +void prom_putchar(unsigned char ch) +{ + static void __iomem *base; + + if (unlikely(base == NULL)) { + if (is_ar2315()) + base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE)); + else + base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE)); + } + + while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) + ; + prom_uart_wr(base, UART_TX, ch); + while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0) + ; +} |