ARM: SAMSUNG: Add s3c24xx/s3c64xx CAMIF GPIO setup helpers

This patch adds default helper functions for the camera port
pin configuration. Whenever pinctrl support for s3c24xx/s3c64xx
SoCs is available these code should be removed and proper pinctrl
API should be used in the CAMIF driver.

Signed-off-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

4 files changed, 77 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c24xx/Kconfig b/arch/arm/mach-s3c24xx/Kconfig
index 2b6cb5f29c2d..01f70c977676 100644
--- a/arch/arm/mach-s3c24xx/Kconfig
+++ b/arch/arm/mach-s3c24xx/Kconfig
@@ -405,6 +405,7 @@ config MACH_MINI2440
         select NEW_LEDS
         select S3C_DEV_NAND
         select S3C_DEV_USB_HOST
+        select S3C_SETUP_CAMIF
         help
           Say Y here to select support for the MINI2440. Is a 10cm x 10cm board
           available via various sources. It can come with a 3.5" or 7" touch LCD.
diff --git a/arch/arm/plat-samsung/Kconfig b/arch/arm/plat-samsung/Kconfig
index 59401e1cc530..95360e679f4e 100644
--- a/arch/arm/plat-samsung/Kconfig
+++ b/arch/arm/plat-samsung/Kconfig
@@ -414,6 +414,11 @@ config S5P_SETUP_MIPIPHY
         help
           Compile in common setup code for MIPI-CSIS and MIPI-DSIM devices
 
+config S3C_SETUP_CAMIF
+        bool
+        help
+          Compile in common setup code for S3C CAMIF devices
+
 # DMA
 
 config S3C_DMA
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 9e40e8d00740..3a7c64d1814a 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_S5P_DEV_UART)	+= s5p-dev-uart.o
 
 obj-$(CONFIG_SAMSUNG_DEV_BACKLIGHT)     += dev-backlight.o
 
+obj-$(CONFIG_S3C_SETUP_CAMIF)   += setup-camif.o
 obj-$(CONFIG_S5P_SETUP_MIPIPHY) += setup-mipiphy.o
 
 # DMA support
diff --git a/arch/arm/plat-samsung/setup-camif.c b/arch/arm/plat-samsung/setup-camif.c
new file mode 100644
index 000000000000..e01bf760af2c
--- /dev/null
+++ b/arch/arm/plat-samsung/setup-camif.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2012 Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
+ *
+ * Helper functions for S3C24XX/S3C64XX SoC series CAMIF driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/gpio.h>
+#include <plat/gpio-cfg.h>
+
+/* Number of camera port pins, without FIELD */
+#define S3C_CAMIF_NUM_GPIOS     13
+
+/* Default camera port configuration helpers. */
+
+static void camif_get_gpios(int *gpio_start, int *gpio_reset)
+{
+#ifdef CONFIG_ARCH_S3C24XX
+        *gpio_start = S3C2410_GPJ(0);
+        *gpio_reset = S3C2410_GPJ(12);
+#else
+        /* s3c64xx */
+        *gpio_start = S3C64XX_GPF(0);
+        *gpio_reset = S3C64XX_GPF(3);
+#endif
+}
+
+int s3c_camif_gpio_get(void)
+{
+        int gpio_start, gpio_reset;
+        int ret, i;
+
+        camif_get_gpios(&gpio_start, &gpio_reset);
+
+        for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
+                int gpio = gpio_start + i;
+
+                if (gpio == gpio_reset)
+                        continue;
+
+                ret = gpio_request(gpio, "camif");
+                if (!ret)
+                        ret = s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
+                if (ret) {
+                        pr_err("failed to configure GPIO %d\n", gpio);
+                        for (--i; i >= 0; i--)
+                                gpio_free(gpio--);
+                        return ret;
+                }
+                s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
+        }
+
+        return 0;
+}
+
+void s3c_camif_gpio_put(void)
+{
+        int i, gpio_start, gpio_reset;
+
+        camif_get_gpios(&gpio_start, &gpio_reset);
+
+        for (i = 0; i < S3C_CAMIF_NUM_GPIOS; i++) {
+                int gpio = gpio_start + i;
+                if (gpio != gpio_reset)
+                        gpio_free(gpio);
+        }
+}