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openwrt/target/linux/cns3xxx/patches-3.3/470-gpio_irq.patch
Felix Fietkau 6b778f57aa cns3xxx: fix gpio access and add gpio IRQ support 
Signed-off-by: Tim Harvey <tharvey@gateworks.com>

 target/linux/cns3xxx/patches-3.3/470-gpio_irq.patch |  536 ++++++++++++++++++++
 1 file changed, 536 insertions(+)

SVN-Revision: 33648
2012-10-07 23:23:52 +00:00

537 lines
16 KiB
Diff
Raw Blame History

--- 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 */
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