From 272ebcedf708210247209f301f39a81c78988ef5 Mon Sep 17 00:00:00 2001
From: lars <lars@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Wed, 5 Aug 2009 12:56:17 +0000
Subject: [s3c24xx] gta02: Workaround hardware bug on rev 5 and earlier
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17130 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
.../arch/arm/mach-s3c2442/mach-gta02.c | 54 ++++++++++++++++++++++
1 file changed, 54 insertions(+)
(limited to 'target')
diff --git a/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c
index b74c94eea..49ab6c43b 100644
--- a/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c
+++ b/target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c
@@ -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);
--
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