ARM: 5775/1: ep93xx: add keypad core support

Add the core support needed by the ep93xx matrix keypad driver.

The keypad driver unfortunately was merged early and the core
support is missing.  The clkdev support has been resolved and
is now merged.  This adds the platform device to the ep93xx
core and supplies the functions needed to acquire/free the gpio
pins and actually enable/disable the controller peripheral.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Ryan Mallon <ryan@bluewatersys.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 82 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index b4357c388d2e..1f0d66561bbe 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -31,6 +31,7 @@
 
 #include <mach/hardware.h>
 #include <mach/fb.h>
+#include <mach/ep93xx_keypad.h>
 
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
@@ -728,6 +729,82 @@ void __init ep93xx_register_fb(struct ep93xxfb_mach_info *data)
         platform_device_register(&ep93xx_fb_device);
 }
 
+
+/*************************************************************************
+ * EP93xx matrix keypad peripheral handling
+ *************************************************************************/
+static struct resource ep93xx_keypad_resource[] = {
+        {
+                .start  = EP93XX_KEY_MATRIX_PHYS_BASE,
+                .end    = EP93XX_KEY_MATRIX_PHYS_BASE + 0x0c - 1,
+                .flags  = IORESOURCE_MEM,
+        }, {
+                .start  = IRQ_EP93XX_KEY,
+                .end    = IRQ_EP93XX_KEY,
+                .flags  = IORESOURCE_IRQ,
+        },
+};
+
+static struct platform_device ep93xx_keypad_device = {
+        .name                   = "ep93xx-keypad",
+        .id                     = -1,
+        .num_resources          = ARRAY_SIZE(ep93xx_keypad_resource),
+        .resource               = ep93xx_keypad_resource,
+};
+
+void __init ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data)
+{
+        ep93xx_keypad_device.dev.platform_data = data;
+        platform_device_register(&ep93xx_keypad_device);
+}
+
+int ep93xx_keypad_acquire_gpio(struct platform_device *pdev)
+{
+        int err;
+        int i;
+
+        for (i = 0; i < 8; i++) {
+                err = gpio_request(EP93XX_GPIO_LINE_C(i), dev_name(&pdev->dev));
+                if (err)
+                        goto fail_gpio_c;
+                err = gpio_request(EP93XX_GPIO_LINE_D(i), dev_name(&pdev->dev));
+                if (err)
+                        goto fail_gpio_d;
+        }
+
+        /* Enable the keypad controller; GPIO ports C and D used for keypad */
+        ep93xx_devcfg_clear_bits(EP93XX_SYSCON_DEVCFG_KEYS |
+                                 EP93XX_SYSCON_DEVCFG_GONK);
+
+        return 0;
+
+fail_gpio_d:
+        gpio_free(EP93XX_GPIO_LINE_C(i));
+fail_gpio_c:
+        for ( ; i >= 0; --i) {
+                gpio_free(EP93XX_GPIO_LINE_C(i));
+                gpio_free(EP93XX_GPIO_LINE_D(i));
+        }
+        return err;
+}
+EXPORT_SYMBOL(ep93xx_keypad_acquire_gpio);
+
+void ep93xx_keypad_release_gpio(struct platform_device *pdev)
+{
+        int i;
+
+        for (i = 0; i < 8; i++) {
+                gpio_free(EP93XX_GPIO_LINE_C(i));
+                gpio_free(EP93XX_GPIO_LINE_D(i));
+        }
+
+        /* Disable the keypad controller; GPIO ports C and D used for GPIO */
+        ep93xx_devcfg_set_bits(EP93XX_SYSCON_DEVCFG_KEYS |
+                               EP93XX_SYSCON_DEVCFG_GONK);
+}
+EXPORT_SYMBOL(ep93xx_keypad_release_gpio);
+
+
 extern void ep93xx_gpio_init(void);
 
 void __init ep93xx_init_devices(void)
diff --git a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
index b1f937eda29c..d55194a4c093 100644
--- a/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
+++ b/arch/arm/mach-ep93xx/include/mach/ep93xx-regs.h
@@ -134,6 +134,7 @@
 #define EP93XX_UART3_PHYS_BASE          EP93XX_APB_PHYS(0x000e0000)
 #define EP93XX_UART3_BASE               EP93XX_APB_IOMEM(0x000e0000)
 
+#define EP93XX_KEY_MATRIX_PHYS_BASE     EP93XX_APB_PHYS(0x000f0000)
 #define EP93XX_KEY_MATRIX_BASE          EP93XX_APB_IOMEM(0x000f0000)
 
 #define EP93XX_ADC_BASE                 EP93XX_APB_IOMEM(0x00100000)
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h
index 469fd968d517..c6dc14dbca18 100644
--- a/arch/arm/mach-ep93xx/include/mach/platform.h
+++ b/arch/arm/mach-ep93xx/include/mach/platform.h
@@ -8,6 +8,7 @@ struct i2c_gpio_platform_data;
 struct i2c_board_info;
 struct platform_device;
 struct ep93xxfb_mach_info;
+struct ep93xx_keypad_platform_data;
 
 struct ep93xx_eth_data
 {
@@ -39,6 +40,9 @@ void ep93xx_register_fb(struct ep93xxfb_mach_info *data);
 void ep93xx_register_pwm(int pwm0, int pwm1);
 int ep93xx_pwm_acquire_gpio(struct platform_device *pdev);
 void ep93xx_pwm_release_gpio(struct platform_device *pdev);
+void ep93xx_register_keypad(struct ep93xx_keypad_platform_data *data);
+int ep93xx_keypad_acquire_gpio(struct platform_device *pdev);
+void ep93xx_keypad_release_gpio(struct platform_device *pdev);
 
 void ep93xx_init_devices(void);
 extern struct sys_timer ep93xx_timer;