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>
Patchwork: http://patchwork.linux-mips.org/patch/8028/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 30 insertions, 15 deletions

diff --git a/arch/mips/ralink/early_printk.c b/arch/mips/ralink/early_printk.c
index b46d0419d09b..255d695ec8c6 100644
--- a/arch/mips/ralink/early_printk.c
+++ b/arch/mips/ralink/early_printk.c
@@ -12,21 +12,24 @@
 #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_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 inline void uart_w32(u32 val, unsigned reg)
 {
@@ -38,11 +41,23 @@ 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);
+}
+
 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 (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)
+                        ;
+        }
 }