diff options
| author | Gabor Juhos <juhosg@openwrt.org> | 2018-07-20 14:58:24 +0300 |
|---|---|---|
| committer | Paul Burton <paul.burton@mips.com> | 2018-07-25 05:07:42 +0300 |
| commit | ffc2058189223a2625ff55dfe1676df86ed03ee3 (patch) | |
| tree | 7ba079dd70d1ff95f5f98920a0c80a0254d275c7 /arch/mips/ath79 | |
| parent | e16343708eec32cb331f6c0dc71e5c52af741385 (diff) | |
| download | linux-ffc2058189223a2625ff55dfe1676df86ed03ee3.tar.xz | |
MIPS: ath79: enable uart during early_prink
This patch ensures, that the pinmux register is properly setup for the
boot console UART when early_printk is enabled.
[paul.burton@mips.com:
- s/poinmux/pinmux/
- s/uart/UART/
- Drop extraneous parentheses.]
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Diffstat (limited to 'arch/mips/ath79')
| -rw-r--r-- | arch/mips/ath79/early_printk.c | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/arch/mips/ath79/early_printk.c b/arch/mips/ath79/early_printk.c index 20e2c315c007..4b1063117ef7 100644 --- a/arch/mips/ath79/early_printk.c +++ b/arch/mips/ath79/early_printk.c @@ -60,6 +60,46 @@ static void prom_putchar_dummy(char ch) /* nothing to do */ } +static void prom_enable_uart(u32 id) +{ + void __iomem *gpio_base; + u32 uart_en; + u32 t; + + switch (id) { + case REV_ID_MAJOR_AR71XX: + uart_en = AR71XX_GPIO_FUNC_UART_EN; + break; + + case REV_ID_MAJOR_AR7240: + case REV_ID_MAJOR_AR7241: + case REV_ID_MAJOR_AR7242: + uart_en = AR724X_GPIO_FUNC_UART_EN; + break; + + case REV_ID_MAJOR_AR913X: + uart_en = AR913X_GPIO_FUNC_UART_EN; + break; + + case REV_ID_MAJOR_AR9330: + case REV_ID_MAJOR_AR9331: + uart_en = AR933X_GPIO_FUNC_UART_EN; + break; + + case REV_ID_MAJOR_AR9341: + case REV_ID_MAJOR_AR9342: + case REV_ID_MAJOR_AR9344: + /* TODO */ + default: + return; + } + + gpio_base = (void __iomem *)KSEG1ADDR(AR71XX_GPIO_BASE); + t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC); + t |= uart_en; + __raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC); +} + static void prom_putchar_init(void) { void __iomem *base; @@ -94,8 +134,10 @@ static void prom_putchar_init(void) default: _prom_putchar = prom_putchar_dummy; - break; + return; } + + prom_enable_uart(id); } void prom_putchar(char ch) |