[ARM] Kirkwood: implement GPIO and GPIO interrupt support

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

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index f1a3b10..d840a64 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -386,6 +386,7 @@ config ARCH_KIRKWOOD
        bool "Marvell Kirkwood"
        select CPU_FEROCEON
        select PCI
+       select GENERIC_GPIO
        select GENERIC_TIME
        select GENERIC_CLOCKEVENTS
        select PLAT_ORION

diff --git a/arch/arm/mach-kirkwood/include/mach/gpio.h b/arch/arm/mach-kirkwood/include/mach/gpio.h
new file mode 100644 (file)
index 0000000..81b335e
--- /dev/null
+++ b/arch/arm/mach-kirkwood/include/mach/gpio.h
@@ -0,0 +1,38 @@
+/*
+ * arch/asm-arm/mach-kirkwood/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 */
+
+#define GPIO_MAX               50
+#define GPIO_OFF(pin)          (((pin) >> 5) ? 0x0140 : 0x0100)
+#define GPIO_OUT(pin)          (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x00)
+#define GPIO_IO_CONF(pin)      (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x04)
+#define GPIO_BLINK_EN(pin)     (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x08)
+#define GPIO_IN_POL(pin)       (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x0c)
+#define GPIO_DATA_IN(pin)      (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x10)
+#define GPIO_EDGE_CAUSE(pin)   (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x14)
+#define GPIO_EDGE_MASK(pin)    (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x18)
+#define GPIO_LEVEL_MASK(pin)   (DEV_BUS_VIRT_BASE + GPIO_OFF(pin) + 0x1c)
+
+static inline int gpio_to_irq(int pin)
+{
+       return pin + IRQ_KIRKWOOD_GPIO_START;
+}
+
+static inline int irq_to_gpio(int irq)
+{
+       return irq - IRQ_KIRKWOOD_GPIO_START;
+}
+
+
+#endif

diff --git a/arch/arm/mach-kirkwood/include/mach/irqs.h b/arch/arm/mach-kirkwood/include/mach/irqs.h
index 3a964bb..f00a0a4 100644 (file)
--- a/arch/arm/mach-kirkwood/include/mach/irqs.h
+++ b/arch/arm/mach-kirkwood/include/mach/irqs.h
@@ -11,8 +11,6 @@
 #ifndef __ASM_ARCH_IRQS_H
 #define __ASM_ARCH_IRQS_H
 
-#include "kirkwood.h"  /* need GPIO_MAX */
-
 /*
  * Low Interrupt Controller
  */
@@ -57,7 +55,7 @@
  * KIRKWOOD General Purpose Pins
  */
 #define IRQ_KIRKWOOD_GPIO_START        64
-#define NR_GPIO_IRQS           GPIO_MAX
+#define NR_GPIO_IRQS           50
 
 #define NR_IRQS                        (IRQ_KIRKWOOD_GPIO_START + NR_GPIO_IRQS)
 

diff --git a/arch/arm/mach-kirkwood/include/mach/kirkwood.h b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
index eae4240..ada480c 100644 (file)
--- a/arch/arm/mach-kirkwood/include/mach/kirkwood.h
+++ b/arch/arm/mach-kirkwood/include/mach/kirkwood.h
@@ -117,7 +117,4 @@
 #define SATA_PHYS_BASE         (KIRKWOOD_REGS_PHYS_BASE | 0x80000)
 
 
-#define GPIO_MAX               50
-
-
 #endif

diff --git a/arch/arm/mach-kirkwood/irq.c b/arch/arm/mach-kirkwood/irq.c
index 5790643..efb86b7 100644 (file)
--- a/arch/arm/mach-kirkwood/irq.c
+++ b/arch/arm/mach-kirkwood/irq.c
@@ -13,10 +13,45 @@
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <plat/irq.h>
+#include <asm/gpio.h>
 #include "common.h"
 
+static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+       BUG_ON(irq < IRQ_KIRKWOOD_GPIO_LOW_0_7);
+       BUG_ON(irq > IRQ_KIRKWOOD_GPIO_HIGH_16_23);
+
+       orion_gpio_irq_handler((irq - IRQ_KIRKWOOD_GPIO_LOW_0_7) << 3);
+}
+
 void __init kirkwood_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));
+
+       /*
+        * Mask and clear GPIO IRQ interrupts.
+        */
+       writel(0, GPIO_LEVEL_MASK(0));
+       writel(0, GPIO_EDGE_MASK(0));
+       writel(0, GPIO_EDGE_CAUSE(0));
+       writel(0, GPIO_LEVEL_MASK(32));
+       writel(0, GPIO_EDGE_MASK(32));
+       writel(0, GPIO_EDGE_CAUSE(32));
+
+       for (i = IRQ_KIRKWOOD_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_KIRKWOOD_GPIO_LOW_0_7, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_8_15, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_16_23, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_LOW_24_31, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_0_7, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_8_15, gpio_irq_handler);
+       set_irq_chained_handler(IRQ_KIRKWOOD_GPIO_HIGH_16_23, gpio_irq_handler);
 }