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authorJohn Crispin <john@openwrt.org>2015-09-16 08:29:31 +0000
committerJohn Crispin <john@openwrt.org>2015-09-16 08:29:31 +0000
commit6f07b8a6594f14a5d8d659b4b34fec0484759ae0 (patch)
treee2fa8ed4c51635ce6edf24f612cc95758661504e /target/linux/ramips
parent3dc3275b38c11d1afffe48611e43ba9ed27a3427 (diff)
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ramips: make the early_printk code detect which uart is used
only tested on mt7628 Signed-off-by: John Crispin <blogic@openwrt.org> SVN-Revision: 46950
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch29
1 files changed, 27 insertions, 2 deletions
diff --git a/target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch b/target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch
index d139139322..3fffa804cf 100644
--- a/target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch
+++ b/target/linux/ramips/patches-3.18/0015-MIPS-ralink-cleanup-early_printk.patch
@@ -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);
}
@@ -58,6 +60,24 @@ Signed-off-by: John Crispin <blogic@openwrt.org>
+ (__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)
{
- while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
@@ -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)