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From e410b0069ee7c318a5b556f39b8b16814330a208 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Fri, 24 Jan 2014 17:01:17 +0100
Subject: [PATCH 15/57] MIPS: ralink: cleanup early_printk
Add support for the new MT7621/8 SoC and kill ifdefs.
Cleanup some whitespace error while we are at it.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/ralink/early_printk.c | 45 ++++++++++++++++++++++++++-------------
1 file changed, 30 insertions(+), 15 deletions(-)
--- a/arch/mips/ralink/early_printk.c
+++ b/arch/mips/ralink/early_printk.c
@@ -12,21 +12,26 @@
#include <asm/addrspace.h>
#ifdef CONFIG_SOC_RT288X
-#define EARLY_UART_BASE 0x300c00
+#define EARLY_UART_BASE 0x300c00
+#define CHIPID_BASE 0x300004
+#elif defined(CONFIG_SOC_MT7621)
+#define EARLY_UART_BASE 0x1E000c00
+#define CHIPID_BASE 0x1E000004
#else
-#define EARLY_UART_BASE 0x10000c00
+#define EARLY_UART_BASE 0x10000c00
+#define CHIPID_BASE 0x10000004
#endif
-#define UART_REG_RX 0x00
-#define UART_REG_TX 0x04
-#define UART_REG_IER 0x08
-#define UART_REG_IIR 0x0c
-#define UART_REG_FCR 0x10
-#define UART_REG_LCR 0x14
-#define UART_REG_MCR 0x18
-#define UART_REG_LSR 0x1c
+#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 +43,46 @@ static inline u32 uart_r32(unsigned reg)
return __raw_readl(uart_membase + reg);
}
+static inline int soc_is_mt7628(void)
+{
+ 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)
{
- while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
- ;
- 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)
+ ;
+ } else {
+ while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
+ ;
+ uart_w32(ch, UART_REG_TX);
+ while ((uart_r32(UART_REG_LSR_RT2880) & UART_LSR_THRE) == 0)
+ ;
+ }
}
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