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authorVasily Khoruzhick <anarsoul@gmail.com>2010-09-08 12:39:46 +0300
committerBen Dooks <ben-linux@fluff.org>2010-09-26 00:45:18 +0100
commit14477095abc661a9f195ca4733bb739c54794b32 (patch)
tree92b4da26c1c7f1349706819756895e462f7bbdd7 /arch/arm/mach-s3c2410/mach-h1940.c
parent56162badadb91aae93843d8d6558c7d7780e3cb2 (diff)
ARM: h1940: Use gpiolib for latch access
This patch adds gpiolib support for h1940 latch. With this patch it's possible to use leds-gpio and uda1380 drivers (they require gpiolib support for appropriate pins). And now it's possible to drop leds-h1940 driver. Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'arch/arm/mach-s3c2410/mach-h1940.c')
-rw-r--r--arch/arm/mach-s3c2410/mach-h1940.c64
1 files changed, 58 insertions, 6 deletions
diff --git a/arch/arm/mach-s3c2410/mach-h1940.c b/arch/arm/mach-s3c2410/mach-h1940.c
index 3ba3bab139d..f0493bdbf0d 100644
--- a/arch/arm/mach-s3c2410/mach-h1940.c
+++ b/arch/arm/mach-s3c2410/mach-h1940.c
@@ -59,6 +59,12 @@
#include <plat/mci.h>
#include <plat/ts.h>
+#define H1940_LATCH ((void __force __iomem *)0xF8000000)
+
+#define H1940_PA_LATCH S3C2410_CS2
+
+#define H1940_LATCH_BIT(x) (1 << ((x) + 16 - S3C_GPIO_END))
+
static struct map_desc h1940_iodesc[] __initdata = {
[0] = {
.virtual = (unsigned long)H1940_LATCH,
@@ -100,9 +106,16 @@ static struct s3c2410_uartcfg h1940_uartcfgs[] __initdata = {
/* Board control latch control */
-static unsigned int latch_state = H1940_LATCH_DEFAULT;
+static unsigned int latch_state = H1940_LATCH_BIT(H1940_LATCH_LCD_P4) |
+ H1940_LATCH_BIT(H1940_LATCH_SM803_ENABLE) |
+ H1940_LATCH_BIT(H1940_LATCH_SDQ1) |
+ H1940_LATCH_BIT(H1940_LATCH_LCD_P1) |
+ H1940_LATCH_BIT(H1940_LATCH_LCD_P2) |
+ H1940_LATCH_BIT(H1940_LATCH_LCD_P3) |
+ H1940_LATCH_BIT(H1940_LATCH_MAX1698_nSHUTDOWN) |
+ H1940_LATCH_BIT(H1940_LATCH_CPUQ5);
-void h1940_latch_control(unsigned int clear, unsigned int set)
+static void h1940_latch_control(unsigned int clear, unsigned int set)
{
unsigned long flags;
@@ -116,7 +129,42 @@ void h1940_latch_control(unsigned int clear, unsigned int set)
local_irq_restore(flags);
}
-EXPORT_SYMBOL_GPL(h1940_latch_control);
+static inline int h1940_gpiolib_to_latch(int offset)
+{
+ return 1 << (offset + 16);
+}
+
+static void h1940_gpiolib_latch_set(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ int latch_bit = h1940_gpiolib_to_latch(offset);
+
+ h1940_latch_control(value ? 0 : latch_bit,
+ value ? latch_bit : 0);
+}
+
+static int h1940_gpiolib_latch_output(struct gpio_chip *chip,
+ unsigned offset, int value)
+{
+ h1940_gpiolib_latch_set(chip, offset, value);
+ return 0;
+}
+
+static int h1940_gpiolib_latch_get(struct gpio_chip *chip,
+ unsigned offset)
+{
+ return (latch_state >> (offset + 16)) & 1;
+}
+
+struct gpio_chip h1940_latch_gpiochip = {
+ .base = H1940_LATCH_GPIO(0),
+ .owner = THIS_MODULE,
+ .label = "H1940_LATCH",
+ .ngpio = 16,
+ .direction_output = h1940_gpiolib_latch_output,
+ .set = h1940_gpiolib_latch_set,
+ .get = h1940_gpiolib_latch_get,
+};
static void h1940_udc_pullup(enum s3c2410_udc_cmd_e cmd)
{
@@ -125,10 +173,10 @@ static void h1940_udc_pullup(enum s3c2410_udc_cmd_e cmd)
switch (cmd)
{
case S3C2410_UDC_P_ENABLE :
- h1940_latch_control(0, H1940_LATCH_USB_DP);
+ gpio_set_value(H1940_LATCH_USB_DP, 1);
break;
case S3C2410_UDC_P_DISABLE :
- h1940_latch_control(H1940_LATCH_USB_DP, 0);
+ gpio_set_value(H1940_LATCH_USB_DP, 0);
break;
case S3C2410_UDC_P_RESET :
break;
@@ -303,6 +351,8 @@ static void __init h1940_map_io(void)
memcpy(phys_to_virt(H1940_SUSPEND_RESUMEAT), h1940_pm_return, 1024);
#endif
s3c_pm_init();
+
+ WARN_ON(gpiochip_add(&h1940_latch_gpiochip));
}
/* H1940 and RX3715 need to reserve this for suspend */
@@ -342,9 +392,11 @@ static void __init h1940_init(void)
gpio_request(S3C2410_GPC(0), "LCD power");
gpio_request(S3C2410_GPC(5), "LCD power");
gpio_request(S3C2410_GPC(6), "LCD power");
-
gpio_direction_input(S3C2410_GPC(6));
+ gpio_request(H1940_LATCH_USB_DP, "USB pullup");
+ gpio_direction_output(H1940_LATCH_USB_DP, 0);
+
platform_add_devices(h1940_devices, ARRAY_SIZE(h1940_devices));
}