[ARM] mv78xx0: implement GPIO and GPIO interrupt support

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Signed-off-by: Nicolas Pitre <nico@marvell.com>

arch/arm/Kconfig

@@ -429,6 +429,7 @@ config ARCH_MV78XX0
 	bool "Marvell MV78xx0"
 	select CPU_FEROCEON
 	select PCI
+	select GENERIC_GPIO
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
 	select PLAT_ORION

arch/arm/mach-mv78xx0/include/mach/gpio.h

@@ -0,0 +1,40 @@
+/*
+ * arch/asm-arm/mach-mv78xx0/include/mach/gpio.h
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#ifndef __ASM_ARCH_GPIO_H
+#define __ASM_ARCH_GPIO_H
+
+#include <mach/irqs.h>
+#include <plat/gpio.h>
+#include <asm-generic/gpio.h>		/* cansleep wrappers */
+
+extern int mv78xx0_core_index(void);
+
+#define GPIO_MAX		32
+#define GPIO_OUT(pin)		(DEV_BUS_VIRT_BASE + 0x0100)
+#define GPIO_IO_CONF(pin)	(DEV_BUS_VIRT_BASE + 0x0104)
+#define GPIO_BLINK_EN(pin)	(DEV_BUS_VIRT_BASE + 0x0108)
+#define GPIO_IN_POL(pin)	(DEV_BUS_VIRT_BASE + 0x010c)
+#define GPIO_DATA_IN(pin)	(DEV_BUS_VIRT_BASE + 0x0110)
+#define GPIO_EDGE_CAUSE(pin)	(DEV_BUS_VIRT_BASE + 0x0114)
+#define GPIO_MASK_OFF		(mv78xx0_core_index() ? 0x18 : 0)
+#define GPIO_EDGE_MASK(pin)	(DEV_BUS_VIRT_BASE + 0x0118 + GPIO_MASK_OFF)
+#define GPIO_LEVEL_MASK(pin)	(DEV_BUS_VIRT_BASE + 0x011c + GPIO_MASK_OFF)
+
+static inline int gpio_to_irq(int pin)
+{
+	return pin + IRQ_MV78XX0_GPIO_START;
+}
+
+static inline int irq_to_gpio(int irq)
+{
+	return irq - IRQ_MV78XX0_GPIO_START;
+}
+
+
+#endif

arch/arm/mach-mv78xx0/include/mach/irqs.h

@@ -11,8 +11,6 @@
 #ifndef __ASM_ARCH_IRQS_H
 #define __ASM_ARCH_IRQS_H
 
-#include "mv78xx0.h"	/* need GPIO_MAX */
-
 /*
  * MV78xx0 Low Interrupt Controller
  */
@@ -88,7 +86,7 @@
  * MV78XX0 General Purpose Pins
  */
 #define IRQ_MV78XX0_GPIO_START	96
-#define NR_GPIO_IRQS		GPIO_MAX
+#define NR_GPIO_IRQS		32
 
 #define NR_IRQS			(IRQ_MV78XX0_GPIO_START + NR_GPIO_IRQS)
 

arch/arm/mach-mv78xx0/include/mach/mv78xx0.h

@@ -122,7 +122,4 @@
 #define SATA_PHYS_BASE		(MV78XX0_REGS_PHYS_BASE | 0xa0000)
 
 
-#define GPIO_MAX		32
-
-
 #endif

arch/arm/mach-mv78xx0/irq.c

@@ -11,13 +11,42 @@
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/irq.h>
+#include <asm/gpio.h>
 #include <mach/mv78xx0.h>
 #include <plat/irq.h>
 #include "common.h"
 
+static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	BUG_ON(irq < IRQ_MV78XX0_GPIO_0_7 || irq > IRQ_MV78XX0_GPIO_24_31);
+
+	orion_gpio_irq_handler((irq - IRQ_MV78XX0_GPIO_0_7) << 3);
+}
+
 void __init mv78xx0_init_irq(void)
 {
+	int i;
+
 	orion_irq_init(0, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF));
 	orion_irq_init(32, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF));
 	orion_irq_init(64, (void __iomem *)(IRQ_VIRT_BASE + IRQ_MASK_ERR_OFF));
+
+	/*
+	 * Mask and clear GPIO IRQ interrupts.
+	 */
+	writel(0, GPIO_LEVEL_MASK(0));
+	writel(0, GPIO_EDGE_MASK(0));
+	writel(0, GPIO_EDGE_CAUSE(0));
+
+	for (i = IRQ_MV78XX0_GPIO_START; i < NR_IRQS; i++) {
+		set_irq_chip(i, &orion_gpio_irq_level_chip);
+		set_irq_handler(i, handle_level_irq);
+		irq_desc[i].status |= IRQ_LEVEL;
+		set_irq_flags(i, IRQF_VALID);
+	}
+	set_irq_chained_handler(IRQ_MV78XX0_GPIO_0_7, gpio_irq_handler);
+	set_irq_chained_handler(IRQ_MV78XX0_GPIO_8_15, gpio_irq_handler);
+	set_irq_chained_handler(IRQ_MV78XX0_GPIO_16_23, gpio_irq_handler);
+	set_irq_chained_handler(IRQ_MV78XX0_GPIO_24_31, gpio_irq_handler);
 }