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[s3c24xx] gta02: Workaround hardware bug on rev 5 and earlier

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@17130 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
lars 2009-08-05 12:56:17 +00:00
parent d9921d9824
commit 272ebcedf7
1 changed files with 54 additions and 0 deletions
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54
target/linux/s3c24xx/files-2.6.30/arch/arm/mach-s3c2442/mach-gta02.c
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@ -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);