openwrt-xburst/target/linux/cns3xxx/patches-3.3/470-gpio_irq.patch

--- a/arch/arm/mach-cns3xxx/Makefile
+++ b/arch/arm/mach-cns3xxx/Makefile
@@ -1,4 +1,4 @@
-obj-$(CONFIG_ARCH_CNS3XXX)		+= core.o pm.o devices.o
+obj-$(CONFIG_ARCH_CNS3XXX)		+= core.o gpio.o pm.o devices.o
 obj-$(CONFIG_PCI)			+= pcie.o
 obj-$(CONFIG_MACH_CNS3420VB)		+= cns3420vb.o
 obj-$(CONFIG_MACH_GW2388)		+= laguna.o
--- a/arch/arm/mach-cns3xxx/cns3420vb.c
+++ b/arch/arm/mach-cns3xxx/cns3420vb.c
@@ -199,7 +199,10 @@ static void __init cns3420_init(void)
 
 	cns3xxx_ahci_init();
 	cns3xxx_sdhci_init();
-
+	cns3xxx_gpio_init( 0, 32, CNS3XXX_GPIOA_BASE_VIRT, IRQ_CNS3XXX_GPIOA,
+		NR_IRQS_CNS3XXX);
+	cns3xxx_gpio_init(32, 32, CNS3XXX_GPIOB_BASE_VIRT, IRQ_CNS3XXX_GPIOB,
+		NR_IRQS_CNS3XXX + 32);
 	cns3xxx_pcie_init(0x3);
 
 	pm_power_off = cns3xxx_power_off;
--- a/arch/arm/mach-cns3xxx/core.c
+++ b/arch/arm/mach-cns3xxx/core.c
@@ -21,7 +21,6 @@
 #include <asm/hardware/gic.h>
 #include <asm/smp_twd.h>
 #include <asm/hardware/cache-l2x0.h>
-#include <asm/gpio.h>
 #include <mach/cns3xxx.h>
 #include "core.h"
 
@@ -83,73 +82,12 @@ static struct map_desc cns3xxx_io_desc[]
 	},
 };
 
-static inline void gpio_line_config(u8 line, u32 direction)
-{
-	u32 reg;
-	if (direction) {
-		if (line < 32) {
-			reg = __raw_readl(CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_DIR);
-			reg |= (1 << line);
-			__raw_writel(reg, CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_DIR);
-		} else {
-			reg = __raw_readl(CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_DIR);
-			reg |= (1 << (line - 32));
-			__raw_writel(reg, CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_DIR);
-		}
-	} else {
-		if (line < 32) {
-			reg = __raw_readl(CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_DIR);
-			reg &= ~(1 << line);
-			__raw_writel(reg, CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_DIR);
-		} else {
-			reg = __raw_readl(CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_DIR);
-			reg &= ~(1 << (line - 32));
-			__raw_writel(reg, CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_DIR);
-		}
-	}
-}
-
-static int cns3xxx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
-{
-	gpio_line_config(gpio, CNS3XXX_GPIO_IN);
-	return 0;
-}
-
-static int cns3xxx_gpio_direction_output(struct gpio_chip *chip, unsigned gpio, int level)
-{
-	gpio_line_set(gpio, level);
-	gpio_line_config(gpio, CNS3XXX_GPIO_OUT);
-	return 0;
-}
-
-static int cns3xxx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
-{
-	return gpio_get_value(gpio);
-}
-
-static void cns3xxx_gpio_set_value(struct gpio_chip *chip, unsigned gpio, int value)
-{
-	gpio_set_value(gpio, value);
-}
-
-static struct gpio_chip cns3xxx_gpio_chip = {
-	.label			= "CNS3XXX_GPIO_CHIP",
-	.direction_input	= cns3xxx_gpio_direction_input,
-	.direction_output	= cns3xxx_gpio_direction_output,
-	.get			= cns3xxx_gpio_get_value,
-	.set			= cns3xxx_gpio_set_value,
-	.base			= 0,
-	.ngpio			= 64,
-};
-
 void __init cns3xxx_common_init(void)
 {
 #ifdef CONFIG_LOCAL_TIMERS
 	twd_base = (void __iomem *) CNS3XXX_TC11MP_TWD_BASE_VIRT;
 #endif
 	iotable_init(cns3xxx_io_desc, ARRAY_SIZE(cns3xxx_io_desc));
-
-	gpiochip_add(&cns3xxx_gpio_chip);
 }
 
 /* used by entry-macro.S */
--- /dev/null
+++ b/arch/arm/mach-cns3xxx/gpio.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright 2012 Gateworks Corporation
+ *     Chris Lang <clang@gateworks.com>
+ *     Tim Harvey <tharvey@gateworks.com>
+ *
+ * This file 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/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+
+#include <asm/mach/irq.h>
+
+/*
+ * Registers
+ */
+#define GPIO_INPUT                          0x04
+#define GPIO_DIR                            0x08
+#define GPIO_SET                            0x10
+#define GPIO_CLEAR                          0x14
+#define GPIO_INTERRUPT_ENABLE               0x20
+#define GPIO_INTERRUPT_RAW_STATUS           0x24
+#define GPIO_INTERRUPT_MASKED_STATUS        0x28
+#define GPIO_INTERRUPT_MASK                 0x2C
+#define GPIO_INTERRUPT_CLEAR                0x30
+#define GPIO_INTERRUPT_TRIGGER_METHOD       0x34
+#define GPIO_INTERRUPT_TRIGGER_BOTH_EDGES   0x38
+#define GPIO_INTERRUPT_TRIGGER_TYPE         0x3C
+
+#define GPIO_INTERRUPT_TRIGGER_METHOD_EDGE  0
+#define GPIO_INTERRUPT_TRIGGER_METHOD_LEVEL 1
+#define GPIO_INTERRUPT_TRIGGER_EDGE_SINGLE  0
+#define GPIO_INTERRUPT_TRIGGER_EDGE_BOTH    1
+#define GPIO_INTERRUPT_TRIGGER_TYPE_RISING  0
+#define GPIO_INTERRUPT_TRIGGER_TYPE_FALLING 1
+#define GPIO_INTERRUPT_TRIGGER_TYPE_HIGH    0
+#define GPIO_INTERRUPT_TRIGGER_TYPE_LOW     1
+
+struct cns3xxx_gpio_chip {
+	struct gpio_chip    chip;
+	spinlock_t          lock;
+	void __iomem        *base;
+	int                 secondary_irq_base;
+};
+
+static struct cns3xxx_gpio_chip cns3xxx_gpio_chips[2];
+static int cns3xxx_gpio_chip_count;
+
+static inline void
+__set_direction(struct cns3xxx_gpio_chip *cchip, unsigned pin, int input)
+{
+	u32 reg;
+
+	reg = __raw_readl(cchip->base + GPIO_DIR);
+	if (input)
+		reg |= 1 << pin;
+	else
+		reg &= !(1 << pin);
+	__raw_writel(reg, cchip->base + GPIO_DIR);
+}
+
+/*
+ * GENERIC_GPIO primatives
+ */
+static int cns3xxx_gpio_direction_input(struct gpio_chip *chip, unsigned pin)
+{
+	struct cns3xxx_gpio_chip *cchip =
+		container_of(chip, struct cns3xxx_gpio_chip, chip);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cchip->lock, flags);
+	__set_direction(cchip, pin, 1);
+	spin_unlock_irqrestore(&cchip->lock, flags);
+
+	return 0;
+}
+
+static int cns3xxx_gpio_get(struct gpio_chip *chip, unsigned pin)
+{
+	struct cns3xxx_gpio_chip *cchip =
+		container_of(chip, struct cns3xxx_gpio_chip, chip);
+	int val;
+
+	val = ((__raw_readl(cchip->base + GPIO_INPUT) >> pin) & 0x1);
+
+	return val;
+}
+
+static int cns3xxx_gpio_direction_output(struct gpio_chip *chip, unsigned pin, int level)
+{
+	struct cns3xxx_gpio_chip *cchip =
+		container_of(chip, struct cns3xxx_gpio_chip, chip);
+	unsigned long flags;
+
+	spin_lock_irqsave(&cchip->lock, flags);
+	if (level)
+		__raw_writel(1 << pin, cchip->base + GPIO_SET);
+	else
+		__raw_writel(1 << pin, cchip->base + GPIO_CLEAR);
+	__set_direction(cchip, pin, 0);
+	spin_unlock_irqrestore(&cchip->lock, flags);
+
+	return 0;
+}
+
+static void cns3xxx_gpio_set(struct gpio_chip *chip, unsigned pin,
+	int level)
+{
+	struct cns3xxx_gpio_chip *cchip =
+		container_of(chip, struct cns3xxx_gpio_chip, chip);
+
+	if (level)
+		__raw_writel(1 << pin, cchip->base + GPIO_SET);
+	else
+		__raw_writel(1 << pin, cchip->base + GPIO_CLEAR);
+}
+
+static int cns3xxx_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
+{
+	struct cns3xxx_gpio_chip *cchip =
+		container_of(chip, struct cns3xxx_gpio_chip, chip);
+
+	return cchip->secondary_irq_base + pin;
+}
+
+
+/*
+ * IRQ support
+ */
+
+/* one interrupt per GPIO controller (GPIOA/GPIOB)
+ * this is called in task context, with IRQs enabled
+ */
+static void cns3xxx_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct cns3xxx_gpio_chip *cchip = irq_get_handler_data(irq);
+	struct irq_chip *chip = irq_get_chip(irq);
+	struct irq_chip_generic *gc = irq_desc_get_chip_data(desc);
+	struct irq_chip_type *ct = gc->chip_types;
+	u16 i;
+	u32 reg;
+
+	chained_irq_enter(chip, desc); /* mask and ack the base interrupt */
+
+	/* see which pin(s) triggered the interrupt */
+	reg = __raw_readl(cchip->base + GPIO_INTERRUPT_RAW_STATUS);
+	for (i = 0; i < 32; i++) {
+		if (reg & (1 << i)) {
+			/* let the generic IRQ layer handle an interrupt */
+			generic_handle_irq(cchip->secondary_irq_base + i);
+		}
+	}
+
+	chained_irq_exit(chip, desc); /* unmask the base interrupt */
+}
+
+static int cns3xxx_gpio_irq_set_type(struct irq_data *d, u32 irqtype)
+{
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct cns3xxx_gpio_chip *cchip = gc->private;
+	u32 gpio = d->irq - cchip->secondary_irq_base;
+	unsigned long flags;
+	u32 method, edges, type;
+
+	spin_lock_irqsave(&cchip->lock, flags);
+	method = __raw_readl(cchip->base + GPIO_INTERRUPT_TRIGGER_METHOD);
+	edges  = __raw_readl(cchip->base + GPIO_INTERRUPT_TRIGGER_BOTH_EDGES);
+	type   = __raw_readl(cchip->base + GPIO_INTERRUPT_TRIGGER_TYPE);
+	method &= ~(1 << gpio);
+	edges  &= ~(1 << gpio);
+	type   &= ~(1 << gpio);
+
+	switch(irqtype) {
+	case IRQ_TYPE_EDGE_RISING:
+		method |= (GPIO_INTERRUPT_TRIGGER_METHOD_EDGE << gpio);
+		edges  |= (GPIO_INTERRUPT_TRIGGER_EDGE_SINGLE << gpio);
+		type   |= (GPIO_INTERRUPT_TRIGGER_TYPE_RISING << gpio);
+		break;
+	case IRQ_TYPE_EDGE_FALLING:
+		method |= (GPIO_INTERRUPT_TRIGGER_METHOD_EDGE << gpio);
+		edges  |= (GPIO_INTERRUPT_TRIGGER_EDGE_SINGLE << gpio);
+		type   |= (GPIO_INTERRUPT_TRIGGER_TYPE_FALLING << gpio);
+		break;
+	case IRQ_TYPE_EDGE_BOTH:
+		method |= (GPIO_INTERRUPT_TRIGGER_METHOD_EDGE << gpio);
+		edges  |= (GPIO_INTERRUPT_TRIGGER_EDGE_BOTH << gpio);
+		break;
+	case IRQ_TYPE_LEVEL_LOW:
+		method |= (GPIO_INTERRUPT_TRIGGER_METHOD_LEVEL << gpio);
+		type   |= (GPIO_INTERRUPT_TRIGGER_TYPE_LOW << gpio);
+		break;
+	case IRQ_TYPE_LEVEL_HIGH:
+		method |= (GPIO_INTERRUPT_TRIGGER_METHOD_LEVEL << gpio);
+		type   |= (GPIO_INTERRUPT_TRIGGER_TYPE_HIGH << gpio);
+		break;
+	default:
+		printk(KERN_WARNING "No irq type\n");
+		spin_unlock_irqrestore(&cchip->lock, flags);
+		return -EINVAL;
+	}
+
+	__raw_writel(method, cchip->base + GPIO_INTERRUPT_TRIGGER_METHOD);
+	__raw_writel(edges,  cchip->base + GPIO_INTERRUPT_TRIGGER_BOTH_EDGES);
+	__raw_writel(type,   cchip->base + GPIO_INTERRUPT_TRIGGER_TYPE);
+	spin_unlock_irqrestore(&cchip->lock, flags);
+
+	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
+		__irq_set_handler_locked(d->irq, handle_level_irq);
+	else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
+		__irq_set_handler_locked(d->irq, handle_edge_irq);
+
+	return 0;
+}
+
+void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
+	u32 base, int irq, int secondary_irq_base)
+{
+	struct cns3xxx_gpio_chip *cchip;
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+	char gc_label[16];
+
+	if (cns3xxx_gpio_chip_count == ARRAY_SIZE(cns3xxx_gpio_chips))
+		return;
+
+	snprintf(gc_label, sizeof(gc_label), "cns3xxx_gpio%d",
+		cns3xxx_gpio_chip_count);
+
+	cchip = cns3xxx_gpio_chips + cns3xxx_gpio_chip_count;
+	cchip->chip.label = kstrdup(gc_label, GFP_KERNEL);
+	cchip->chip.direction_input = cns3xxx_gpio_direction_input;
+	cchip->chip.get = cns3xxx_gpio_get;
+	cchip->chip.direction_output = cns3xxx_gpio_direction_output;
+	cchip->chip.set = cns3xxx_gpio_set;
+	cchip->chip.to_irq = cns3xxx_gpio_to_irq;
+	cchip->chip.base = gpio_base;
+	cchip->chip.ngpio = ngpio;
+	cchip->chip.can_sleep = 0;
+	spin_lock_init(&cchip->lock);
+	cchip->base = (void __iomem *)base;
+	cchip->secondary_irq_base = secondary_irq_base;
+
+	BUG_ON(gpiochip_add(&cchip->chip) < 0);
+	cns3xxx_gpio_chip_count++;
+
+	/* clear GPIO interrupts */
+	__raw_writel(0xffff, cchip->base + GPIO_INTERRUPT_CLEAR);
+
+	/*
+	 * IRQ chip init
+	 */
+	gc = irq_alloc_generic_chip("cns3xxx_gpio_irq", 1, secondary_irq_base,
+		cchip->base, handle_edge_irq);
+	gc->private = cchip;
+
+	ct = gc->chip_types;
+	ct->type = IRQ_TYPE_EDGE_FALLING;
+	ct->regs.ack = GPIO_INTERRUPT_CLEAR;
+	ct->regs.enable = GPIO_INTERRUPT_ENABLE;
+	ct->chip.irq_ack = irq_gc_ack_set_bit;
+	ct->chip.irq_enable = irq_gc_unmask_enable_reg;
+	ct->chip.irq_disable = irq_gc_mask_disable_reg;
+	ct->chip.irq_set_type = cns3xxx_gpio_irq_set_type;
+	ct->handler = handle_edge_irq;
+
+	irq_setup_generic_chip(gc, IRQ_MSK(ngpio), IRQ_GC_INIT_MASK_CACHE,
+		IRQ_NOREQUEST, 0);
+
+	irq_set_chained_handler(irq, cns3xxx_gpio_irq_handler);
+	irq_set_handler_data(irq, cchip);
+}
--- a/arch/arm/mach-cns3xxx/include/mach/gpio.h
+++ b/arch/arm/mach-cns3xxx/include/mach/gpio.h
@@ -1,98 +1,17 @@
 /*
  * arch/arm/mach-cns3xxx/include/mach/gpio.h
  *
- * CNS3xxx GPIO wrappers for arch-neutral GPIO calls
- *
- * Copyright 2011 Gateworks Corporation
- *		  Chris Lang <clang@gateworks.com>
- *
- * Based on IXP implementation by Milan Svoboda <msvoboda@ra.rockwell.com>
- * Based on PXA implementation by Philipp Zabel <philipp.zabel@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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_CNS3XXX_GPIO_H
 #define __ASM_ARCH_CNS3XXX_GPIO_H
 
 #include <linux/kernel.h>
-#include <linux/io.h>
-#include <mach/platform.h>
-#include <asm-generic/gpio.h>			/* cansleep wrappers */
-
-#define NR_BUILTIN_GPIO 64
-
-#define CNS3XXX_GPIO_IN    0x0
-#define CNS3XXX_GPIO_OUT   0x1
-
-#define CNS3XXX_GPIO_LO   0
-#define CNS3XXX_GPIO_HI   1
-
-#define CNS3XXX_GPIO_OUTPUT         0x00
-#define CNS3XXX_GPIO_INPUT          0x04
-#define CNS3XXX_GPIO_DIR            0x08
-#define CNS3XXX_GPIO_SET            0x10
-#define CNS3XXX_GPIO_CLEAR          0x14
-
-static inline void gpio_line_get(u8 line, int *value)
-{
-	if (line < 32)
-		*value = ((__raw_readl(CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_INPUT) >> line) & 0x1);
-	else
-		*value = ((__raw_readl(CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_INPUT) >> (line - 32)) & 0x1);
-}
-
-static inline void gpio_line_set(u8 line, int value)
-{
-	if (line < 32) {
-		if (value)
-			__raw_writel((1 << line), CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_SET);
-		else
-			__raw_writel((1 << line), CNS3XXX_GPIOA_BASE_VIRT + CNS3XXX_GPIO_CLEAR);
-	} else {
-		if (value)
-			__raw_writel((1 << line), CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_SET);
-		else
-			__raw_writel((1 << line), CNS3XXX_GPIOB_BASE_VIRT + CNS3XXX_GPIO_CLEAR);
-	}
-}
-
-static inline int gpio_get_value(unsigned gpio)
-{
-	if (gpio < NR_BUILTIN_GPIO)
-	{
-		int value;
-		gpio_line_get(gpio, &value);
-		return value;
-	}
-	else
-		return __gpio_get_value(gpio);
-}
-
-static inline void gpio_set_value(unsigned gpio, int value)
-{
-	if (gpio < NR_BUILTIN_GPIO)
-		gpio_line_set(gpio, value);
-	else
-		__gpio_set_value(gpio, value);
-}
-
-#define gpio_cansleep __gpio_cansleep
 
-extern int gpio_to_irq(int gpio);
-extern int irq_to_gpio(int gpio);
+extern void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
+	u32 base, int irq, int secondary_irq_base);
 
 #endif
--- a/arch/arm/mach-cns3xxx/laguna.c
+++ b/arch/arm/mach-cns3xxx/laguna.c
@@ -45,6 +45,7 @@
 #include <mach/irqs.h>
 #include <mach/platform.h>
 #include <mach/pm.h>
+#include <mach/gpio.h>
 #include <asm/hardware/gic.h>
 #include "core.h"
 #include "devices.h"
@@ -759,6 +760,10 @@ static int __init laguna_model_setup(voi
 	u8 pcie_bitmap = 0;
 
 	printk("Running on Gateworks Laguna %s\n", laguna_info.model);
+	cns3xxx_gpio_init( 0, 32, CNS3XXX_GPIOA_BASE_VIRT, IRQ_CNS3XXX_GPIOA,
+		NR_IRQS_CNS3XXX);
+	cns3xxx_gpio_init(32, 32, CNS3XXX_GPIOB_BASE_VIRT, IRQ_CNS3XXX_GPIOB,
+		NR_IRQS_CNS3XXX + 32);
 
 	if (strncmp(laguna_info.model, "GW", 2) == 0) {
 		if (laguna_info.config_bitmap & ETH0_LOAD)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -366,7 +366,8 @@ config ARCH_CLPS711X
 config ARCH_CNS3XXX
 	bool "Cavium Networks CNS3XXX family"
 	select CPU_V6K
-	select ARCH_WANT_OPTIONAL_GPIOLIB
+	select ARCH_REQUIRE_GPIOLIB
+	select GENERIC_IRQ_CHIP
 	select GENERIC_CLOCKEVENTS
 	select ARM_GIC
 	select CLKDEV_LOOKUP
--- a/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
+++ b/arch/arm/mach-cns3xxx/include/mach/cns3xxx.h
@@ -627,7 +627,7 @@ int cns3xxx_cpu_clock(void);
 
 #if !defined(NR_IRQS) || (NR_IRQS < NR_IRQS_CNS3XXX)
 #undef NR_IRQS
-#define NR_IRQS				NR_IRQS_CNS3XXX
+#define NR_IRQS				(NR_IRQS_CNS3XXX + 64)
 #endif
 
 #endif	/* __MACH_BOARD_CNS3XXX_H */