ARM: S5PC1xx: add platform helpers for SDHCI host controllers

Samsung S5PC100 has 3 SDHCI controllers compatible with the one known from
previous SoCs series. Add required platform setup and support code that
the devices can be used with sdhci-s3c driver.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

3 files changed, 93 insertions, 0 deletions

diff --git a/arch/arm/plat-s5pc1xx/Kconfig b/arch/arm/plat-s5pc1xx/Kconfig
index 1fc25b9f2242..1608e62b0c9d 100644
--- a/arch/arm/plat-s5pc1xx/Kconfig
+++ b/arch/arm/plat-s5pc1xx/Kconfig
@@ -55,4 +55,10 @@ config S5PC1XX_SETUP_I2C1
         bool
         help
           Common setup code for i2c bus 1.
+
+config S5PC1XX_SETUP_SDHCI_GPIO
+        bool
+        help
+          Common setup code for SDHCI gpio.
+
 endif
diff --git a/arch/arm/plat-s5pc1xx/Makefile b/arch/arm/plat-s5pc1xx/Makefile
index 40ee9571fb01..278f26806089 100644
--- a/arch/arm/plat-s5pc1xx/Makefile
+++ b/arch/arm/plat-s5pc1xx/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_S5P_GPIO_CFG_S5PC1XX) += gpio-config.o
 obj-$(CONFIG_S5PC1XX_SETUP_FB_24BPP) += setup-fb-24bpp.o
 obj-$(CONFIG_S5PC1XX_SETUP_I2C0) += setup-i2c0.o
 obj-$(CONFIG_S5PC1XX_SETUP_I2C1) += setup-i2c1.o
+obj-$(CONFIG_S5PC1XX_SETUP_SDHCI_GPIO)  += setup-sdhci-gpio.o
diff --git a/arch/arm/plat-s5pc1xx/setup-sdhci-gpio.c b/arch/arm/plat-s5pc1xx/setup-sdhci-gpio.c
new file mode 100644
index 000000000000..185c8941e644
--- /dev/null
+++ b/arch/arm/plat-s5pc1xx/setup-sdhci-gpio.c
@@ -0,0 +1,86 @@
+/* linux/arch/arm/plat-s5pc1xx/setup-sdhci-gpio.c
+ *
+ * Copyright 2009 Samsung Eletronics
+ *
+ * S5PC1XX - Helper functions for setting up SDHCI device(s) GPIO (HSMMC)
+ *
+ * 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/kernel.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+
+#include <plat/gpio-cfg.h>
+#include <plat/regs-sdhci.h>
+
+void s5pc100_setup_sdhci0_cfg_gpio(struct platform_device *dev, int width)
+{
+        unsigned int gpio;
+        unsigned int end;
+        unsigned int num;
+
+        num = width;
+        /* In case of 8 width, we should decrease the 2 */
+        if (width == 8)
+                num = width - 2;
+
+        end = S5PC100_GPG0(2 + num);
+
+        /* Set all the necessary GPG0/GPG1 pins to special-function 0 */
+        for (gpio = S5PC100_GPG0(0); gpio < end; gpio++) {
+                s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
+                s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
+        }
+
+        if (width == 8) {
+                for (gpio = S5PC100_GPG1(0); gpio <= S5PC100_GPG1(1); gpio++) {
+                        s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
+                        s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
+                }
+        }
+
+        s3c_gpio_setpull(S5PC100_GPG1(2), S3C_GPIO_PULL_UP);
+        s3c_gpio_cfgpin(S5PC100_GPG1(2), S3C_GPIO_SFN(2));
+}
+
+void s5pc100_setup_sdhci1_cfg_gpio(struct platform_device *dev, int width)
+{
+        unsigned int gpio;
+        unsigned int end;
+
+        end = S5PC100_GPG2(2 + width);
+
+        /* Set all the necessary GPG2 pins to special-function 2 */
+        for (gpio = S5PC100_GPG2(0); gpio < end; gpio++) {
+                s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
+                s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
+        }
+
+        s3c_gpio_setpull(S5PC100_GPG2(6), S3C_GPIO_PULL_UP);
+        s3c_gpio_cfgpin(S5PC100_GPG2(6), S3C_GPIO_SFN(2));
+}
+
+void s5pc100_setup_sdhci2_cfg_gpio(struct platform_device *dev, int width)
+{
+        unsigned int gpio;
+        unsigned int end;
+
+        end = S5PC100_GPG3(2 + width);
+
+        /* Set all the necessary GPG3 pins to special-function 2 */
+        for (gpio = S5PC100_GPG3(0); gpio < end; gpio++) {
+                s3c_gpio_cfgpin(gpio, S3C_GPIO_SFN(2));
+                s3c_gpio_setpull(gpio, S3C_GPIO_PULL_NONE);
+        }
+
+        s3c_gpio_setpull(S5PC100_GPG3(6), S3C_GPIO_PULL_UP);
+        s3c_gpio_cfgpin(S5PC100_GPG3(6), S3C_GPIO_SFN(2));
+}