aboutsummaryrefslogtreecommitdiff
path: root/arch/arm
diff options
context:
space:
mode:
authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-12-20 17:40:03 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-12-20 17:40:03 +0000
commita663a71e429d7d06a7773edc4092995c5fe1171f (patch)
tree3a9e4b3a00754c8d4207fd6e4c310e53879d9772 /arch/arm
parent828aac2ee239dca9c1856c4856a57912e6a487c4 (diff)
parentb95a13d79c0e92c9c844fa8aa089c9bd2ed10705 (diff)
Merge git://git.marvell.com/orion into devel
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/Kconfig2
-rw-r--r--arch/arm/mach-kirkwood/include/mach/gpio.h38
-rw-r--r--arch/arm/mach-kirkwood/include/mach/irqs.h4
-rw-r--r--arch/arm/mach-kirkwood/include/mach/kirkwood.h3
-rw-r--r--arch/arm/mach-kirkwood/irq.c35
-rw-r--r--arch/arm/mach-mv78xx0/include/mach/gpio.h40
-rw-r--r--arch/arm/mach-mv78xx0/include/mach/irqs.h4
-rw-r--r--arch/arm/mach-mv78xx0/include/mach/mv78xx0.h3
-rw-r--r--arch/arm/mach-mv78xx0/irq.c29
-rw-r--r--arch/arm/mach-orion5x/Makefile2
-rw-r--r--arch/arm/mach-orion5x/common.h7
-rw-r--r--arch/arm/mach-orion5x/gpio.c231
-rw-r--r--arch/arm/mach-orion5x/include/mach/gpio.h29
-rw-r--r--arch/arm/mach-orion5x/include/mach/irqs.h4
-rw-r--r--arch/arm/mach-orion5x/include/mach/orion5x.h9
-rw-r--r--arch/arm/mach-orion5x/irq.c183
-rw-r--r--arch/arm/mach-orion5x/mpp.c6
-rw-r--r--arch/arm/plat-orion/Makefile2
-rw-r--r--arch/arm/plat-orion/gpio.c415
-rw-r--r--arch/arm/plat-orion/include/plat/gpio.h39
20 files changed, 642 insertions, 443 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4f870207f49..d6ebe39934b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -387,6 +387,7 @@ config ARCH_KIRKWOOD
bool "Marvell Kirkwood"
select CPU_FEROCEON
select PCI
+ select GENERIC_GPIO
select GENERIC_TIME
select GENERIC_CLOCKEVENTS
select PLAT_ORION
@@ -429,6 +430,7 @@ config ARCH_MV78XX0
bool "Marvell MV78xx0"
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
index 00000000000..81b335eb62e
--- /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 3a964bb1497..f00a0a45a67 100644
--- 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 eae42406fd8..ada480c0e19 100644
--- 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 5790643ffe0..efb86b70027 100644
--- 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);
}
diff --git a/arch/arm/mach-mv78xx0/include/mach/gpio.h b/arch/arm/mach-mv78xx0/include/mach/gpio.h
new file mode 100644
index 00000000000..d9d1535ea10
--- /dev/null
+++ b/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
diff --git a/arch/arm/mach-mv78xx0/include/mach/irqs.h b/arch/arm/mach-mv78xx0/include/mach/irqs.h
index bebc330281e..fa1d422196c 100644
--- a/arch/arm/mach-mv78xx0/include/mach/irqs.h
+++ b/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)
diff --git a/arch/arm/mach-mv78xx0/include/mach/mv78xx0.h b/arch/arm/mach-mv78xx0/include/mach/mv78xx0.h
index ee9c5593ee9..e930ea5330a 100644
--- a/arch/arm/mach-mv78xx0/include/mach/mv78xx0.h
+++ b/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
diff --git a/arch/arm/mach-mv78xx0/irq.c b/arch/arm/mach-mv78xx0/irq.c
index 503e5d195ae..e273418797b 100644
--- a/arch/arm/mach-mv78xx0/irq.c
+++ b/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);
}
diff --git a/arch/arm/mach-orion5x/Makefile b/arch/arm/mach-orion5x/Makefile
index 3d4a1bc1235..edc38e2c856 100644
--- a/arch/arm/mach-orion5x/Makefile
+++ b/arch/arm/mach-orion5x/Makefile
@@ -1,4 +1,4 @@
-obj-y += common.o addr-map.o pci.o gpio.o irq.o mpp.o
+obj-y += common.o addr-map.o pci.o irq.o mpp.o
obj-$(CONFIG_MACH_DB88F5281) += db88f5281-setup.o
obj-$(CONFIG_MACH_RD88F5182) += rd88f5182-setup.o
obj-$(CONFIG_MACH_KUROBOX_PRO) += kurobox_pro-setup.o
diff --git a/arch/arm/mach-orion5x/common.h b/arch/arm/mach-orion5x/common.h
index a000c7c6ee9..798b9a5e3da 100644
--- a/arch/arm/mach-orion5x/common.h
+++ b/arch/arm/mach-orion5x/common.h
@@ -51,13 +51,6 @@ int orion5x_pci_sys_setup(int nr, struct pci_sys_data *sys);
struct pci_bus *orion5x_pci_sys_scan_bus(int nr, struct pci_sys_data *sys);
int orion5x_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin);
-/*
- * Valid GPIO pins according to MPP setup, used by machine-setup.
- * (/mach-orion/gpio.c).
- */
-void orion5x_gpio_set_valid(unsigned pin, int valid);
-void gpio_display(void); /* debug */
-
struct machine_desc;
struct meminfo;
struct tag;
diff --git a/arch/arm/mach-orion5x/gpio.c b/arch/arm/mach-orion5x/gpio.c
deleted file mode 100644
index f99d08811e5..00000000000
--- a/arch/arm/mach-orion5x/gpio.c
+++ /dev/null
@@ -1,231 +0,0 @@
-/*
- * arch/arm/mach-orion5x/gpio.c
- *
- * GPIO functions for Marvell Orion System On Chip
- *
- * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
- *
- * 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.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/spinlock.h>
-#include <linux/bitops.h>
-#include <linux/io.h>
-#include <asm/gpio.h>
-#include <mach/orion5x.h>
-#include "common.h"
-
-static DEFINE_SPINLOCK(gpio_lock);
-static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];
-static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
-
-void __init orion5x_gpio_set_valid(unsigned pin, int valid)
-{
- if (valid)
- __set_bit(pin, gpio_valid);
- else
- __clear_bit(pin, gpio_valid);
-}
-
-/*
- * GENERIC_GPIO primitives
- */
-int gpio_direction_input(unsigned pin)
-{
- unsigned long flags;
-
- if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
- pr_debug("%s: invalid GPIO %d\n", __func__, pin);
- return -EINVAL;
- }
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- /*
- * Some callers might have not used the gpio_request(),
- * so flag this pin as requested now.
- */
- if (!gpio_label[pin])
- gpio_label[pin] = "?";
-
- orion5x_setbits(GPIO_IO_CONF, 1 << pin);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
- return 0;
-}
-EXPORT_SYMBOL(gpio_direction_input);
-
-int gpio_direction_output(unsigned pin, int value)
-{
- unsigned long flags;
- int mask;
-
- if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
- pr_debug("%s: invalid GPIO %d\n", __func__, pin);
- return -EINVAL;
- }
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- /*
- * Some callers might have not used the gpio_request(),
- * so flag this pin as requested now.
- */
- if (!gpio_label[pin])
- gpio_label[pin] = "?";
-
- mask = 1 << pin;
- orion5x_clrbits(GPIO_BLINK_EN, mask);
- if (value)
- orion5x_setbits(GPIO_OUT, mask);
- else
- orion5x_clrbits(GPIO_OUT, mask);
- orion5x_clrbits(GPIO_IO_CONF, mask);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
- return 0;
-}
-EXPORT_SYMBOL(gpio_direction_output);
-
-int gpio_get_value(unsigned pin)
-{
- int val, mask = 1 << pin;
-
- if (readl(GPIO_IO_CONF) & mask)
- val = readl(GPIO_DATA_IN) ^ readl(GPIO_IN_POL);
- else
- val = readl(GPIO_OUT);
-
- return val & mask;
-}
-EXPORT_SYMBOL(gpio_get_value);
-
-void gpio_set_value(unsigned pin, int value)
-{
- unsigned long flags;
- int mask = 1 << pin;
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- orion5x_clrbits(GPIO_BLINK_EN, mask);
- if (value)
- orion5x_setbits(GPIO_OUT, mask);
- else
- orion5x_clrbits(GPIO_OUT, mask);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
-}
-EXPORT_SYMBOL(gpio_set_value);
-
-void orion5x_gpio_set_blink(unsigned pin, int blink)
-{
- unsigned long flags;
- int mask = 1 << pin;
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- orion5x_clrbits(GPIO_OUT, mask);
- if (blink)
- orion5x_setbits(GPIO_BLINK_EN, mask);
- else
- orion5x_clrbits(GPIO_BLINK_EN, mask);
-
- spin_unlock_irqrestore(&gpio_lock, flags);
-}
-EXPORT_SYMBOL(orion5x_gpio_set_blink);
-
-int gpio_request(unsigned pin, const char *label)
-{
- int ret = 0;
- unsigned long flags;
-
- if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
- pr_debug("%s: invalid GPIO %d\n", __func__, pin);
- return -EINVAL;
- }
-
- spin_lock_irqsave(&gpio_lock, flags);
-
- if (gpio_label[pin]) {
- pr_debug("%s: GPIO %d already used as %s\n",
- __func__, pin, gpio_label[pin]);
- ret = -EBUSY;
- } else
- gpio_label[pin] = label ? label : "?";
-
- spin_unlock_irqrestore(&gpio_lock, flags);
- return ret;
-}
-EXPORT_SYMBOL(gpio_request);
-
-void gpio_free(unsigned pin)
-{
- might_sleep();
-
- if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
- pr_debug("%s: invalid GPIO %d\n", __func__, pin);
- return;
- }
-
- if (!gpio_label[pin])
- pr_warning("%s: GPIO %d already freed\n", __func__, pin);
- else
- gpio_label[pin] = NULL;
-}
-EXPORT_SYMBOL(gpio_free);
-
-/* Debug helper */
-void gpio_display(void)
-{
- int i;
-
- for (i = 0; i < GPIO_MAX; i++) {
- printk(KERN_DEBUG "Pin-%d: ", i);
-
- if (!test_bit(i, gpio_valid)) {
- printk("non-GPIO\n");
- } else if (!gpio_label[i]) {
- printk("GPIO, free\n");
- } else {
- printk("GPIO, used by %s, ", gpio_label[i]);
- if (readl(GPIO_IO_CONF) & (1 << i)) {
- printk("input, active %s, level %s, edge %s\n",
- ((readl(GPIO_IN_POL) >> i) & 1) ? "low" : "high",
- ((readl(GPIO_LEVEL_MASK) >> i) & 1) ? "enabled" : "masked",
- ((readl(GPIO_EDGE_MASK) >> i) & 1) ? "enabled" : "masked");
- } else {
- printk("output, val=%d\n", (readl(GPIO_OUT) >> i) & 1);
- }
- }
- }
-
- printk(KERN_DEBUG "MPP_0_7_CTRL (0x%08x) = 0x%08x\n",
- MPP_0_7_CTRL, readl(MPP_0_7_CTRL));
- printk(KERN_DEBUG "MPP_8_15_CTRL (0x%08x) = 0x%08x\n",
- MPP_8_15_CTRL, readl(MPP_8_15_CTRL));
- printk(KERN_DEBUG "MPP_16_19_CTRL (0x%08x) = 0x%08x\n",
- MPP_16_19_CTRL, readl(MPP_16_19_CTRL));
- printk(KERN_DEBUG "MPP_DEV_CTRL (0x%08x) = 0x%08x\n",
- MPP_DEV_CTRL, readl(MPP_DEV_CTRL));
- printk(KERN_DEBUG "GPIO_OUT (0x%08x) = 0x%08x\n",
- GPIO_OUT, readl(GPIO_OUT));
- printk(KERN_DEBUG "GPIO_IO_CONF (0x%08x) = 0x%08x\n",
- GPIO_IO_CONF, readl(GPIO_IO_CONF));
- printk(KERN_DEBUG "GPIO_BLINK_EN (0x%08x) = 0x%08x\n",
- GPIO_BLINK_EN, readl(GPIO_BLINK_EN));
- printk(KERN_DEBUG "GPIO_IN_POL (0x%08x) = 0x%08x\n",
- GPIO_IN_POL, readl(GPIO_IN_POL));
- printk(KERN_DEBUG "GPIO_DATA_IN (0x%08x) = 0x%08x\n",
- GPIO_DATA_IN, readl(GPIO_DATA_IN));
- printk(KERN_DEBUG "GPIO_LEVEL_MASK (0x%08x) = 0x%08x\n",
- GPIO_LEVEL_MASK, readl(GPIO_LEVEL_MASK));
- printk(KERN_DEBUG "GPIO_EDGE_CAUSE (0x%08x) = 0x%08x\n",
- GPIO_EDGE_CAUSE, readl(GPIO_EDGE_CAUSE));
- printk(KERN_DEBUG "GPIO_EDGE_MASK (0x%08x) = 0x%08x\n",
- GPIO_EDGE_MASK, readl(GPIO_EDGE_MASK));
-}
diff --git a/arch/arm/mach-orion5x/include/mach/gpio.h b/arch/arm/mach-orion5x/include/mach/gpio.h
index 65dc136a86f..d8182e87ac1 100644
--- a/arch/arm/mach-orion5x/include/mach/gpio.h
+++ b/arch/arm/mach-orion5x/include/mach/gpio.h
@@ -2,18 +2,26 @@
* arch/arm/mach-orion5x/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
+ * License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
-extern int gpio_request(unsigned pin, const char *label);
-extern void gpio_free(unsigned pin);
-extern int gpio_direction_input(unsigned pin);
-extern int gpio_direction_output(unsigned pin, int value);
-extern int gpio_get_value(unsigned pin);
-extern void gpio_set_value(unsigned pin, int value);
-extern void orion5x_gpio_set_blink(unsigned pin, int blink);
-extern void gpio_display(void); /* debug */
+#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 32
+#define GPIO_OUT(pin) ORION5X_DEV_BUS_REG(0x100)
+#define GPIO_IO_CONF(pin) ORION5X_DEV_BUS_REG(0x104)
+#define GPIO_BLINK_EN(pin) ORION5X_DEV_BUS_REG(0x108)
+#define GPIO_IN_POL(pin) ORION5X_DEV_BUS_REG(0x10c)
+#define GPIO_DATA_IN(pin) ORION5X_DEV_BUS_REG(0x110)
+#define GPIO_EDGE_CAUSE(pin) ORION5X_DEV_BUS_REG(0x114)
+#define GPIO_EDGE_MASK(pin) ORION5X_DEV_BUS_REG(0x118)
+#define GPIO_LEVEL_MASK(pin) ORION5X_DEV_BUS_REG(0x11c)
static inline int gpio_to_irq(int pin)
{
@@ -25,4 +33,5 @@ static inline int irq_to_gpio(int irq)
return irq - IRQ_ORION5X_GPIO_START;
}
-#include <asm-generic/gpio.h> /* cansleep wrappers */
+
+#endif
diff --git a/arch/arm/mach-orion5x/include/mach/irqs.h b/arch/arm/mach-orion5x/include/mach/irqs.h
index d5b0fbf6b96..a6fa9d8f12d 100644
--- a/arch/arm/mach-orion5x/include/mach/irqs.h
+++ b/arch/arm/mach-orion5x/include/mach/irqs.h
@@ -13,8 +13,6 @@
#ifndef __ASM_ARCH_IRQS_H
#define __ASM_ARCH_IRQS_H
-#include "orion5x.h" /* need GPIO_MAX */
-
/*
* Orion Main Interrupt Controller
*/
@@ -54,7 +52,7 @@
* Orion General Purpose Pins
*/
#define IRQ_ORION5X_GPIO_START 32
-#define NR_GPIO_IRQS GPIO_MAX
+#define NR_GPIO_IRQS 32
#define NR_IRQS (IRQ_ORION5X_GPIO_START + NR_GPIO_IRQS)
diff --git a/arch/arm/mach-orion5x/include/mach/orion5x.h b/arch/arm/mach-orion5x/include/mach/orion5x.h
index 9f5ce1ce584..67bda31406d 100644
--- a/arch/arm/mach-orion5x/include/mach/orion5x.h
+++ b/arch/arm/mach-orion5x/include/mach/orion5x.h
@@ -134,14 +134,6 @@
#define MPP_16_19_CTRL ORION5X_DEV_BUS_REG(0x050)
#define MPP_DEV_CTRL ORION5X_DEV_BUS_REG(0x008)
#define MPP_RESET_SAMPLE ORION5X_DEV_BUS_REG(0x010)
-#define GPIO_OUT ORION5X_DEV_BUS_REG(0x100)
-#define GPIO_IO_CONF ORION5X_DEV_BUS_REG(0x104)
-#define GPIO_BLINK_EN ORION5X_DEV_BUS_REG(0x108)
-#define GPIO_IN_POL ORION5X_DEV_BUS_REG(0x10c)
-#define GPIO_DATA_IN ORION5X_DEV_BUS_REG(0x110)
-#define GPIO_EDGE_CAUSE ORION5X_DEV_BUS_REG(0x114)
-#define GPIO_EDGE_MASK ORION5X_DEV_BUS_REG(0x118)
-#define GPIO_LEVEL_MASK ORION5X_DEV_BUS_REG(0x11c)
#define DEV_BANK_0_PARAM ORION5X_DEV_BUS_REG(0x45c)
#define DEV_BANK_1_PARAM ORION5X_DEV_BUS_REG(0x460)
#define DEV_BANK_2_PARAM ORION5X_DEV_BUS_REG(0x464)
@@ -149,7 +141,6 @@
#define DEV_BUS_CTRL ORION5X_DEV_BUS_REG(0x4c0)
#define DEV_BUS_INT_CAUSE ORION5X_DEV_BUS_REG(0x4d0)
#define DEV_BUS_INT_MASK ORION5X_DEV_BUS_REG(0x4d4)
-#define GPIO_MAX 32
/***************************************************************************
* Orion CPU Bridge Registers
diff --git a/arch/arm/mach-orion5x/irq.c b/arch/arm/mach-orion5x/irq.c
index 632a36f5cf1..0caae43301e 100644
--- a/arch/arm/mach-orion5x/irq.c
+++ b/arch/arm/mach-orion5x/irq.c
@@ -19,193 +19,38 @@
#include <plat/irq.h>
#include "common.h"
-/*****************************************************************************
- * Orion GPIO IRQ
- *
- * GPIO_IN_POL register controlls whether GPIO_DATA_IN will hold the same
- * value of the line or the opposite value.
- *
- * Level IRQ handlers: DATA_IN is used directly as cause register.
- * Interrupt are masked by LEVEL_MASK registers.
- * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
- * Interrupt are masked by EDGE_MASK registers.
- * Both-edge handlers: Similar to regular Edge handlers, but also swaps
- * the polarity to catch the next line transaction.
- * This is a race condition that might not perfectly
- * work on some use cases.
- *
- * Every eight GPIO lines are grouped (OR'ed) before going up to main
- * cause register.
- *
- * EDGE cause mask
- * data-in /--------| |-----| |----\
- * -----| |----- ---- to main cause reg
- * X \----------------| |----/
- * polarity LEVEL mask
- *
- ****************************************************************************/
-static void orion5x_gpio_irq_ack(u32 irq)
-{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- /*
- * Mask bit for level interrupt
- */
- orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- /*
- * Clear casue bit for egde interrupt
- */
- orion5x_clrbits(GPIO_EDGE_CAUSE, 1 << pin);
-}
-
-static void orion5x_gpio_irq_mask(u32 irq)
-{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- orion5x_clrbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- orion5x_clrbits(GPIO_EDGE_MASK, 1 << pin);
-}
-
-static void orion5x_gpio_irq_unmask(u32 irq)
+static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
- int pin = irq_to_gpio(irq);
- if (irq_desc[irq].status & IRQ_LEVEL)
- orion5x_setbits(GPIO_LEVEL_MASK, 1 << pin);
- else
- orion5x_setbits(GPIO_EDGE_MASK, 1 << pin);
-}
-
-static int orion5x_gpio_set_irq_type(u32 irq, u32 type)
-{
- int pin = irq_to_gpio(irq);
- struct irq_desc *desc;
-
- if ((readl(GPIO_IO_CONF) & (1 << pin)) == 0) {
- printk(KERN_ERR "orion5x_gpio_set_irq_type failed "
- "(irq %d, pin %d).\n", irq, pin);
- return -EINVAL;
- }
-
- desc = irq_desc + irq;
-
- switch (type) {
- case IRQ_TYPE_LEVEL_HIGH:
- desc->handle_irq = handle_level_irq;
- desc->status |= IRQ_LEVEL;
- orion5x_clrbits(GPIO_IN_POL, (1 << pin));
- break;
- case IRQ_TYPE_LEVEL_LOW:
- desc->handle_irq = handle_level_irq;
- desc->status |= IRQ_LEVEL;
- orion5x_setbits(GPIO_IN_POL, (1 << pin));
- break;
- case IRQ_TYPE_EDGE_RISING:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- orion5x_clrbits(GPIO_IN_POL, (1 << pin));
- break;
- case IRQ_TYPE_EDGE_FALLING:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- orion5x_setbits(GPIO_IN_POL, (1 << pin));
- break;
- case IRQ_TYPE_EDGE_BOTH:
- desc->handle_irq = handle_edge_irq;
- desc->status &= ~IRQ_LEVEL;
- /*
- * set initial polarity based on current input level
- */
- if ((readl(GPIO_IN_POL) ^ readl(GPIO_DATA_IN))
- & (1 << pin))
- orion5x_setbits(GPIO_IN_POL, (1 << pin)); /* falling */
- else
- orion5x_clrbits(GPIO_IN_POL, (1 << pin)); /* rising */
-
- break;
- default:
- printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
- return -EINVAL;
- }
-
- desc->status &= ~IRQ_TYPE_SENSE_MASK;
- desc->status |= type & IRQ_TYPE_SENSE_MASK;
-
- return 0;
-}
-
-static struct irq_chip orion5x_gpio_irq_chip = {
- .name = "Orion-IRQ-GPIO",
- .ack = orion5x_gpio_irq_ack,
- .mask = orion5x_gpio_irq_mask,
- .unmask = orion5x_gpio_irq_unmask,
- .set_type = orion5x_gpio_set_irq_type,
-};
-
-static void orion5x_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
- u32 cause, offs, pin;
-
BUG_ON(irq < IRQ_ORION5X_GPIO_0_7 || irq > IRQ_ORION5X_GPIO_24_31);
- offs = (irq - IRQ_ORION5X_GPIO_0_7) * 8;
- cause = (readl(GPIO_DATA_IN) & readl(GPIO_LEVEL_MASK)) |
- (readl(GPIO_EDGE_CAUSE) & readl(GPIO_EDGE_MASK));
- for (pin = offs; pin < offs + 8; pin++) {
- if (cause & (1 << pin)) {
- irq = gpio_to_irq(pin);
- desc = irq_desc + irq;
- if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
- /* Swap polarity (race with GPIO line) */
- u32 polarity = readl(GPIO_IN_POL);
- polarity ^= 1 << pin;
- writel(polarity, GPIO_IN_POL);
- }
- generic_handle_irq(irq);
- }
- }
+ orion_gpio_irq_handler((irq - IRQ_ORION5X_GPIO_0_7) << 3);
}
-static void __init orion5x_init_gpio_irq(void)
+void __init orion5x_init_irq(void)
{
int i;
- struct irq_desc *desc;
+
+ orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);
/*
* Mask and clear GPIO IRQ interrupts
*/
- writel(0x0, GPIO_LEVEL_MASK);
- writel(0x0, GPIO_EDGE_MASK);
- writel(0x0, GPIO_EDGE_CAUSE);
+ writel(0x0, GPIO_LEVEL_MASK(0));
+ writel(0x0, GPIO_EDGE_MASK(0));
+ writel(0x0, GPIO_EDGE_CAUSE(0));
/*
* Register chained level handlers for GPIO IRQs by default.
* User can use set_type() if he wants to use edge types handlers.
*/
for (i = IRQ_ORION5X_GPIO_START; i < NR_IRQS; i++) {
- set_irq_chip(i, &orion5x_gpio_irq_chip);
+ set_irq_chip(i, &orion_gpio_irq_level_chip);
set_irq_handler(i, handle_level_irq);
- desc = irq_desc + i;
- desc->status |= IRQ_LEVEL;
+ irq_desc[i].status |= IRQ_LEVEL;
set_irq_flags(i, IRQF_VALID);
}
- set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, orion5x_gpio_irq_handler);
- set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, orion5x_gpio_irq_handler);
-}
-
-/*****************************************************************************
- * Orion Main IRQ
- ****************************************************************************/
-static void __init orion5x_init_main_irq(void)
-{
- orion_irq_init(0, (void __iomem *)MAIN_IRQ_MASK);
-}
-
-void __init orion5x_init_irq(void)
-{
- orion5x_init_main_irq();
- orion5x_init_gpio_irq();
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_0_7, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_8_15, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_16_23, gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION5X_GPIO_24_31, gpio_irq_handler);
}
diff --git a/arch/arm/mach-orion5x/mpp.c b/arch/arm/mach-orion5x/mpp.c
index 640ea2a3fc6..e23a3f91d6c 100644
--- a/arch/arm/mach-orion5x/mpp.c
+++ b/arch/arm/mach-orion5x/mpp.c
@@ -12,6 +12,7 @@
#include <linux/init.h>
#include <linux/mbus.h>
#include <linux/io.h>
+#include <asm/gpio.h>
#include <mach/hardware.h>
#include "common.h"
#include "mpp.h"
@@ -152,7 +153,10 @@ void __init orion5x_mpp_conf(struct orion5x_mpp_mode *mode)
*reg &= ~(0xf << shift);
*reg |= (num_type & 0xf) << shift;
- orion5x_gpio_set_valid(mode->mpp, !!(mode->type == MPP_GPIO));
+ if (mode->type == MPP_UNUSED && (mode->mpp < 16 || is_5182()))
+ orion_gpio_set_unused(mode->mpp);
+
+ orion_gpio_set_valid(mode->mpp, !!(mode->type == MPP_GPIO));
mode++;
}
diff --git a/arch/arm/plat-orion/Makefile b/arch/arm/plat-orion/Makefile
index 198f3dde2be..56021a72e10 100644
--- a/arch/arm/plat-orion/Makefile
+++ b/arch/arm/plat-orion/Makefile
@@ -6,3 +6,5 @@ obj-y := irq.o pcie.o time.o
obj-m :=
obj-n :=
obj- :=
+
+obj-$(CONFIG_GENERIC_GPIO) += gpio.o
diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c
new file mode 100644
index 00000000000..967186425ca
--- /dev/null
+++ b/arch/arm/plat-orion/gpio.c
@@ -0,0 +1,415 @@
+/*
+ * arch/arm/plat-orion/gpio.c
+ *
+ * Marvell Orion SoC GPIO handling.
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <asm/gpio.h>
+
+static DEFINE_SPINLOCK(gpio_lock);
+static const char *gpio_label[GPIO_MAX]; /* non null for allocated GPIOs */
+static unsigned long gpio_valid[BITS_TO_LONGS(GPIO_MAX)];
+
+static inline void __set_direction(unsigned pin, int input)
+{
+ u32 u;
+
+ u = readl(GPIO_IO_CONF(pin));
+ if (input)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_IO_CONF(pin));
+}
+
+static void __set_level(unsigned pin, int high)
+{
+ u32 u;
+
+ u = readl(GPIO_OUT(pin));
+ if (high)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_OUT(pin));
+}
+
+
+/*
+ * GENERIC_GPIO primitives.
+ */
+int gpio_direction_input(unsigned pin)
+{
+ unsigned long flags;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __func__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Some callers might not have used gpio_request(),
+ * so flag this pin as requested now.
+ */
+ if (gpio_label[pin] == NULL)
+ gpio_label[pin] = "?";
+
+ /*
+ * Configure GPIO direction.
+ */
+ __set_direction(pin, 1);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned pin, int value)
+{
+ unsigned long flags;
+ u32 u;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __func__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Some callers might not have used gpio_request(),
+ * so flag this pin as requested now.
+ */
+ if (gpio_label[pin] == NULL)
+ gpio_label[pin] = "?";
+
+ /*
+ * Disable blinking.
+ */
+ u = readl(GPIO_BLINK_EN(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_BLINK_EN(pin));
+
+ /*
+ * Configure GPIO output value.
+ */
+ __set_level(pin, value);
+
+ /*
+ * Configure GPIO direction.
+ */
+ __set_direction(pin, 0);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+int gpio_get_value(unsigned pin)
+{
+ int val;
+
+ if (readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31)))
+ val = readl(GPIO_DATA_IN(pin)) ^ readl(GPIO_IN_POL(pin));
+ else
+ val = readl(GPIO_OUT(pin));
+
+ return (val >> (pin & 31)) & 1;
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+void gpio_set_value(unsigned pin, int value)
+{
+ unsigned long flags;
+ u32 u;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Disable blinking.
+ */
+ u = readl(GPIO_BLINK_EN(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_BLINK_EN(pin));
+
+ /*
+ * Configure GPIO output value.
+ */
+ __set_level(pin, value);
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+int gpio_request(unsigned pin, const char *label)
+{
+ unsigned long flags;
+ int ret;
+
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __func__, pin);
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(&gpio_lock, flags);
+ if (gpio_label[pin] == NULL) {
+ gpio_label[pin] = label ? label : "?";
+ ret = 0;
+ } else {
+ pr_debug("%s: GPIO %d already used as %s\n",
+ __func__, pin, gpio_label[pin]);
+ ret = -EBUSY;
+ }
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned pin)
+{
+ if (pin >= GPIO_MAX || !test_bit(pin, gpio_valid)) {
+ pr_debug("%s: invalid GPIO %d\n", __func__, pin);
+ return;
+ }
+
+ if (gpio_label[pin] == NULL)
+ pr_warning("%s: GPIO %d already freed\n", __func__, pin);
+ else
+ gpio_label[pin] = NULL;
+}
+EXPORT_SYMBOL(gpio_free);
+
+
+/*
+ * Orion-specific GPIO API extensions.
+ */
+void __init orion_gpio_set_unused(unsigned pin)
+{
+ /*
+ * Configure as output, drive low.
+ */
+ __set_level(pin, 0);
+ __set_direction(pin, 0);
+}
+
+void __init orion_gpio_set_valid(unsigned pin, int valid)
+{
+ if (valid)
+ __set_bit(pin, gpio_valid);
+ else
+ __clear_bit(pin, gpio_valid);
+}
+
+void orion_gpio_set_blink(unsigned pin, int blink)
+{
+ unsigned long flags;
+ u32 u;
+
+ spin_lock_irqsave(&gpio_lock, flags);
+
+ /*
+ * Set output value to zero.
+ */
+ __set_level(pin, 0);
+
+ u = readl(GPIO_BLINK_EN(pin));
+ if (blink)
+ u |= 1 << (pin & 31);
+ else
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_BLINK_EN(pin));
+
+ spin_unlock_irqrestore(&gpio_lock, flags);
+}
+EXPORT_SYMBOL(orion_gpio_set_blink);
+
+
+/*****************************************************************************
+ * Orion GPIO IRQ
+ *
+ * GPIO_IN_POL register controls whether GPIO_DATA_IN will hold the same
+ * value of the line or the opposite value.
+ *
+ * Level IRQ handlers: DATA_IN is used directly as cause register.
+ * Interrupt are masked by LEVEL_MASK registers.
+ * Edge IRQ handlers: Change in DATA_IN are latched in EDGE_CAUSE.
+ * Interrupt are masked by EDGE_MASK registers.
+ * Both-edge handlers: Similar to regular Edge handlers, but also swaps
+ * the polarity to catch the next line transaction.
+ * This is a race condition that might not perfectly
+ * work on some use cases.
+ *
+ * Every eight GPIO lines are grouped (OR'ed) before going up to main
+ * cause register.
+ *
+ * EDGE cause mask
+ * data-in /--------| |-----| |----\
+ * -----| |----- ---- to main cause reg
+ * X \----------------| |----/
+ * polarity LEVEL mask
+ *
+ ****************************************************************************/
+static void gpio_irq_edge_ack(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+
+ writel(~(1 << (pin & 31)), GPIO_EDGE_CAUSE(pin));
+}
+
+static void gpio_irq_edge_mask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_EDGE_MASK(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_EDGE_MASK(pin));
+}
+
+static void gpio_irq_edge_unmask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_EDGE_MASK(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_EDGE_MASK(pin));
+}
+
+static void gpio_irq_level_mask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_LEVEL_MASK(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_LEVEL_MASK(pin));
+}
+
+static void gpio_irq_level_unmask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ u32 u;
+
+ u = readl(GPIO_LEVEL_MASK(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_LEVEL_MASK(pin));
+}
+
+static int gpio_irq_set_type(u32 irq, u32 type)
+{
+ int pin = irq_to_gpio(irq);
+ struct irq_desc *desc;
+ u32 u;
+
+ u = readl(GPIO_IO_CONF(pin)) & (1 << (pin & 31));
+ if (!u) {
+ printk(KERN_ERR "orion gpio_irq_set_type failed "
+ "(irq %d, pin %d).\n", irq, pin);
+ return -EINVAL;
+ }
+
+ desc = irq_desc + irq;
+
+ /*
+ * Set edge/level type.
+ */
+ if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
+ desc->chip = &orion_gpio_irq_edge_chip;
+ } else if (type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+ desc->chip = &orion_gpio_irq_level_chip;
+ } else {
+ printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
+ return -EINVAL;
+ }
+
+ /*
+ * Configure interrupt polarity.
+ */
+ if (type == IRQ_TYPE_EDGE_RISING || type == IRQ_TYPE_LEVEL_HIGH) {
+ u = readl(GPIO_IN_POL(pin));
+ u &= ~(1 << (pin & 31));
+ writel(u, GPIO_IN_POL(pin));
+ } else if (type == IRQ_TYPE_EDGE_FALLING || type == IRQ_TYPE_LEVEL_LOW) {
+ u = readl(GPIO_IN_POL(pin));
+ u |= 1 << (pin & 31);
+ writel(u, GPIO_IN_POL(pin));
+ } else if (type == IRQ_TYPE_EDGE_BOTH) {
+ u32 v;
+
+ v = readl(GPIO_IN_POL(pin)) ^ readl(GPIO_DATA_IN(pin));
+
+ /*
+ * set initial polarity based on current input level
+ */
+ u = readl(GPIO_IN_POL(pin));
+ if (v & (1 << (pin & 31)))
+ u |= 1 << (pin & 31); /* falling */
+ else
+ u &= ~(1 << (pin & 31)); /* rising */
+ writel(u, GPIO_IN_POL(pin));
+ }
+
+ desc->status = (desc->status & ~IRQ_TYPE_SENSE_MASK) | type;
+
+ return 0;
+}
+
+struct irq_chip orion_gpio_irq_edge_chip = {
+ .name = "orion_gpio_irq_edge",
+ .ack = gpio_irq_edge_ack,
+ .mask = gpio_irq_edge_mask,
+ .unmask = gpio_irq_edge_unmask,
+ .set_type = gpio_irq_set_type,
+};
+
+struct irq_chip orion_gpio_irq_level_chip = {
+ .name = "orion_gpio_irq_level",
+ .mask = gpio_irq_level_mask,
+ .mask_ack = gpio_irq_level_mask,
+ .unmask = gpio_irq_level_unmask,
+ .set_type = gpio_irq_set_type,
+};
+
+void orion_gpio_irq_handler(int pinoff)
+{
+ u32 cause;
+ int pin;
+
+ cause = readl(GPIO_DATA_IN(pinoff)) & readl(GPIO_LEVEL_MASK(pinoff));
+ cause |= readl(GPIO_EDGE_CAUSE(pinoff)) & readl(GPIO_EDGE_MASK(pinoff));
+
+ for (pin = pinoff; pin < pinoff + 8; pin++) {
+ int irq = gpio_to_irq(pin);
+ struct irq_desc *desc = irq_desc + irq;
+
+ if (!(cause & (1 << (pin & 31))))
+ continue;
+
+ if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
+ /* Swap polarity (race with GPIO line) */
+ u32 polarity;
+
+ polarity = readl(GPIO_IN_POL(pin));
+ polarity ^= 1 << (pin & 31);
+ writel(polarity, GPIO_IN_POL(pin));
+ }
+ desc_handle_irq(irq, desc);
+ }
+}
diff --git a/arch/arm/plat-orion/include/plat/gpio.h b/arch/arm/plat-orion/include/plat/gpio.h
new file mode 100644
index 00000000000..54deaf274b5
--- /dev/null
+++ b/arch/arm/plat-orion/include/plat/gpio.h
@@ -0,0 +1,39 @@
+/*
+ * arch/arm/plat-orion/include/plat/gpio.h
+ *
+ * Marvell Orion SoC GPIO handling.
+ *
+ * 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 __PLAT_GPIO_H
+#define __PLAT_GPIO_H
+
+/*
+ * GENERIC_GPIO primitives.
+ */
+int gpio_request(unsigned pin, const char *label);
+void gpio_free(unsigned pin);
+int gpio_direction_input(unsigned pin);
+int gpio_direction_output(unsigned pin, int value);
+int gpio_get_value(unsigned pin);
+void gpio_set_value(unsigned pin, int value);
+
+/*
+ * Orion-specific GPIO API extensions.
+ */
+void orion_gpio_set_unused(unsigned pin);
+void orion_gpio_set_valid(unsigned pin, int valid);
+void orion_gpio_set_blink(unsigned pin, int blink);
+
+/*
+ * GPIO interrupt handling.
+ */
+extern struct irq_chip orion_gpio_irq_edge_chip;
+extern struct irq_chip orion_gpio_irq_level_chip;
+void orion_gpio_irq_handler(int irqoff);
+
+
+#endif