ar71xx: add AR933x specific early_printk support

[openwrt/svn-archive/archive.git] / target / linux / ar71xx / files / arch / mips / ar71xx / early_printk.c

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c b/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
index 76f69c562b8c4d563e95938376854cc6e82427a2..f84c76d75369403489462e045f7d4813e6d8a702 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/early_printk.c
@@ -1,7 +1,7 @@
 /*
- *  Atheros AR71xx SoC early printk support
+ *  Atheros AR7xxx/AR9xxx SoC early printk support
  *
- *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  *  This program is free software; you can redistribute it and/or modify it
@@ -9,19 +9,23 @@
  *  by the Free Software Foundation.
  */
 
+#include <linux/errno.h>
 #include <linux/io.h>
 #include <linux/serial_reg.h>
 #include <asm/addrspace.h>
 
 #include <asm/mach-ar71xx/ar71xx.h>
 
+static void __iomem *prom_uart_base;
+static void (*_putchar)(unsigned char);
+
 #define UART_READ(r) \
-       __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
+       __raw_readl(prom_uart_base + 4 * (r))
 
 #define UART_WRITE(r, v) \
-       __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
+       __raw_writel((v), prom_uart_base + 4 * (r))
 
-void prom_putchar(unsigned char ch)
+static void prom_putchar_ar71xx(unsigned char ch)
 {
        while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0)
                ;
@@ -30,3 +34,53 @@ void prom_putchar(unsigned char ch)
                ;
 }
 
+static void prom_putchar_ar933x(unsigned char ch)
+{
+       while (((UART_READ(0)) & 0x200) == 0)
+               ;
+       UART_WRITE(0, 0x200 | ch);
+       while (((UART_READ(0)) & 0x200) == 0)
+               ;
+}
+
+static int prom_putchar_init(void)
+{
+       if (_putchar)
+               return 0;
+
+       switch(ar71xx_soc) {
+       case AR71XX_SOC_AR7130:
+       case AR71XX_SOC_AR7141:
+       case AR71XX_SOC_AR7161:
+       case AR71XX_SOC_AR7240:
+       case AR71XX_SOC_AR7241:
+       case AR71XX_SOC_AR7242:
+       case AR71XX_SOC_AR9130:
+       case AR71XX_SOC_AR9132:
+       case AR71XX_SOC_AR9341:
+       case AR71XX_SOC_AR9342:
+       case AR71XX_SOC_AR9344:
+               prom_uart_base = (void __iomem *) KSEG1ADDR(AR71XX_UART_BASE);
+               _putchar = prom_putchar_ar71xx;
+               break;
+
+       case AR71XX_SOC_AR9330:
+       case AR71XX_SOC_AR9331:
+               prom_uart_base = (void __iomem *) KSEG1ADDR(AR933X_UART_BASE);
+               _putchar = prom_putchar_ar933x;
+               break;
+
+       default:
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
+void prom_putchar(unsigned char ch)
+{
+       if (prom_putchar_init())
+               return;
+
+       _putchar(ch);
+}