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ramips: make the early_printk code detect which uart is used

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only tested on mt7628

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 46950
This commit is contained in:
John Crispin 2015-09-16 08:29:31 +00:00
parent 3dc3275b38
commit 6f07b8a659
1 changed files with 27 additions and 2 deletions
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29
target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch
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@ -13,7 +13,7 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
--- a/arch/mips/ralink/early_printk.c
+++ b/arch/mips/ralink/early_printk.c
@@ -12,21 +12,24 @@
@@ -12,21 +12,26 @@
#include <asm/addrspace.h>
#ifdef CONFIG_SOC_RT288X
@ -40,15 +40,17 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+#define MT7628_CHIP_NAME1 0x20203832
+
+#define UART_REG_TX 0x04
+#define UART_REG_LCR 0x0c
+#define UART_REG_LSR 0x14
+#define UART_REG_LSR_RT2880 0x1c
static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
+static __iomem void *chipid_membase = (__iomem void *) KSEG1ADDR(CHIPID_BASE);
+static int init_complete;
static inline void uart_w32(u32 val, unsigned reg)
{
@@ -38,11 +41,23 @@ static inline u32 uart_r32(unsigned reg)
@@ -38,11 +43,46 @@
return __raw_readl(uart_membase + reg);
}
@ -57,6 +59,24 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ return IS_ENABLED(CONFIG_SOC_MT7620) &&
+ (__raw_readl(chipid_membase) == MT7628_CHIP_NAME1);
+}
+
+static inline void find_uart_base(void)
+{
+ int i;
+
+ if (!soc_is_mt7628())
+ return;
+
+ for (i = 0; i < 3; i++) {
+ u32 reg = uart_r32(UART_REG_LCR + (0x100 * i));
+
+ if (!reg)
+ continue;
+
+ uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE + (0x100 * i));
+ break;
+ }
+}
+
void prom_putchar(unsigned char ch)
{
@ -65,6 +85,11 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
- uart_w32(ch, UART_REG_TX);
- while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
- ;
+ if (!init_complete) {
+ find_uart_base();
+ init_complete = 1;
+ }
+
+ if (IS_ENABLED(CONFIG_SOC_MT7621) || soc_is_mt7628()) {
+ uart_w32(ch, UART_TX);
+ while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)