[s3c24xx] gta02: Workaround hardware bug on rev 5 and earlier
authorLars-Peter Clausen <lars@metafoo.de>
Wed, 5 Aug 2009 12:56:17 +0000 (12:56 +0000)
committerLars-Peter Clausen <lars@metafoo.de>
Wed, 5 Aug 2009 12:56:17 +0000 (12:56 +0000)
SVN-Revision: 17130

target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c

index b74c94e..49ab6c4 100644 (file)
@@ -91,6 +91,7 @@
 #include <plat/iic.h>
 #include <plat/usb-control.h>
 #include <plat/regs-timer.h>
+#include <plat/gpio-core.h>
 
 #include <mach/gta02-pm-gsm.h>
 #include <mach/gta02-pm-gps.h>
@@ -1636,6 +1637,57 @@ static void gta02_poweroff(void)
                  PCF50633_OOCSHDWN_GOSTDBY, PCF50633_OOCSHDWN_GOSTDBY);
 }
 
+
+/* On hardware rev 5 and earlier the leds are missing a resistor and reading
+ * from their gpio pins will always return 0, so we have to shadow the
+ * led states software */
+static unsigned long gpb_shadow;
+extern struct s3c_gpio_chip s3c24xx_gpios[];
+
+static void gta02_gpb_set(struct gpio_chip *chip,
+                           unsigned offset, int value)
+{
+       void __iomem *base = S3C24XX_GPIO_BASE(S3C2410_GPB0);
+       unsigned long flags;
+       unsigned long dat;
+
+       local_irq_save(flags);
+
+       dat = __raw_readl(base + 0x04) | gpb_shadow;
+       dat &= ~(1 << offset);
+       gpb_shadow &= ~(1 << offset);
+       if (value) {
+               dat |= 1 << offset;
+               switch (offset) {
+               case 0 ... 2:
+                       gpb_shadow |= 1 << offset;
+                       break;
+               default:
+                       break;
+               }
+       }
+       __raw_writel(dat, base + 0x04);
+
+       local_irq_restore(flags);
+}
+
+static int gta02_gpb_get(struct gpio_chip *chip, unsigned offset)
+{
+       void __iomem *base = S3C24XX_GPIO_BASE(S3C2410_GPB0);
+       unsigned long val;
+
+       val = __raw_readl(base + 0x04) | gpb_shadow;
+       val >>= offset;
+       val &= 1;
+
+       return val;
+}
+
+static void gta02_hijack_gpb(void) {
+    s3c24xx_gpios[1].chip.set = gta02_gpb_set;
+    s3c24xx_gpios[1].chip.get = gta02_gpb_get;
+}
+
 static void __init gta02_machine_init(void)
 {
        int rc;
@@ -1652,6 +1704,8 @@ static void __init gta02_machine_init(void)
        default:
                break;
        }
+       if (S3C_SYSTEM_REV_ATAG <= GTA02v5_SYSTEM_REV)
+               gta02_hijack_gpb();
 
        spin_lock_init(&motion_irq_lock);