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From f55a400f4a691f3750eaf7bfcd6ecbf7ed1622f0 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <juhosg@openwrt.org>
Date: Mon, 5 Mar 2018 11:38:21 +0100
Subject: [PATCH 15/33] MIPS: ath79: enable uart during early_prink
This patch ensures, that the poinmux register is properly setup for the
boot console uart when early_printk is enabled.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John Crispin <john@phrozen.org>
---
arch/mips/ath79/early_printk.c | 44 +++++++++++++++++++++++++++++++++++++++++-
1 file changed, 43 insertions(+), 1 deletion(-)
--- a/arch/mips/ath79/early_printk.c
+++ b/arch/mips/ath79/early_printk.c
@@ -58,6 +58,46 @@ static void prom_putchar_dummy(unsigned
/* 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;
@@ -92,8 +132,10 @@ static void prom_putchar_init(void)
default:
_prom_putchar = prom_putchar_dummy;
- break;
+ return;
}
+
+ prom_enable_uart(id);
}
void prom_putchar(unsigned char ch)
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