[ARM] pxa: add GPIO support for pxa168

Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/Kconfig

@@ -490,6 +490,8 @@ config ARCH_PXA
 config ARCH_MMP
 	bool "Marvell PXA168"
 	depends on MMU
+	select GENERIC_GPIO
+	select ARCH_REQUIRE_GPIOLIB
 	select HAVE_CLK
 	select COMMON_CLKDEV
 	select GENERIC_TIME

arch/arm/mach-mmp/include/mach/gpio.h

@@ -0,0 +1,36 @@
+#ifndef __ASM_MACH_GPIO_H
+#define __ASM_MACH_GPIO_H
+
+#include <mach/addr-map.h>
+#include <mach/irqs.h>
+#include <asm-generic/gpio.h>
+
+#define GPIO_REGS_VIRT	(APB_VIRT_BASE + 0x19000)
+
+#define BANK_OFF(n)	(((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
+#define GPIO_REG(x)	(*((volatile u32 *)(GPIO_REGS_VIRT + (x))))
+
+#define NR_BUILTIN_GPIO	(128)
+
+#define gpio_to_bank(gpio)	((gpio) >> 5)
+#define gpio_to_irq(gpio)	(IRQ_GPIO_START + (gpio))
+#define irq_to_gpio(irq)	((irq) - IRQ_GPIO_START)
+
+
+#define __gpio_is_inverted(gpio)	(0)
+#define __gpio_is_occupied(gpio)	(0)
+
+/* NOTE: these macros are defined here to make optimization of
+ * gpio_{get,set}_value() to work when 'gpio' is a constant.
+ * Usage of these macros otherwise is no longer recommended,
+ * use generic GPIO API whenever possible.
+ */
+#define GPIO_bit(gpio)	(1 << ((gpio) & 0x1f))
+
+#define GPLR(x)		GPIO_REG(BANK_OFF(gpio_to_bank(x)) + 0x00)
+#define GPDR(x)		GPIO_REG(BANK_OFF(gpio_to_bank(x)) + 0x0c)
+#define GPSR(x)		GPIO_REG(BANK_OFF(gpio_to_bank(x)) + 0x18)
+#define GPCR(x)		GPIO_REG(BANK_OFF(gpio_to_bank(x)) + 0x24)
+
+#include <plat/gpio.h>
+#endif /* __ASM_MACH_GPIO_H */

arch/arm/mach-mmp/pxa168.c

@@ -12,22 +12,41 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/list.h>
+#include <linux/io.h>
 #include <linux/clk.h>
 
 #include <asm/mach/time.h>
 #include <mach/addr-map.h>
 #include <mach/cputype.h>
 #include <mach/regs-apbc.h>
 #include <mach/irqs.h>
+#include <mach/gpio.h>
 #include <mach/dma.h>
 #include <mach/devices.h>
 
 #include "common.h"
 #include "clock.h"
 
+#define APMASK(i)	(GPIO_REGS_VIRT + BANK_OFF(i) + 0x09c)
+
+static void __init pxa168_init_gpio(void)
+{
+	int i;
+
+	/* enable GPIO clock */
+	__raw_writel(APBC_APBCLK | APBC_FNCLK, APBC_PXA168_GPIO);
+
+	/* unmask GPIO edge detection for all 4 banks - APMASKx */
+	for (i = 0; i < 4; i++)
+		__raw_writel(0xffffffff, APMASK(i));
+
+	pxa_init_gpio(IRQ_PXA168_GPIOX, 0, 127, NULL);
+}
+
 void __init pxa168_init_irq(void)
 {
 	icu_init_irq();
+	pxa168_init_gpio();
 }
 
 /* APB peripheral clocks */