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-rw-r--r--drivers/gpio/Kconfig8
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/max7301.c2
-rw-r--r--drivers/gpio/pca953x.c80
-rw-r--r--drivers/gpio/pl061.c341
5 files changed, 425 insertions, 7 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index edb02530e46..3582c39f972 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -67,9 +67,15 @@ config GPIO_SYSFS
comment "Memory mapped GPIO expanders:"
+config GPIO_PL061
+ bool "PrimeCell PL061 GPIO support"
+ depends on ARM_AMBA
+ help
+ Say yes here to support the PrimeCell PL061 GPIO device
+
config GPIO_XILINX
bool "Xilinx GPIO support"
- depends on PPC_OF
+ depends on PPC_OF || MICROBLAZE
help
Say yes here to support the Xilinx FPGA GPIO device
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 49ac64e515e..ef90203e8f3 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_GPIO_MAX732X) += max732x.o
obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
+obj-$(CONFIG_GPIO_PL061) += pl061.o
obj-$(CONFIG_GPIO_TWL4030) += twl4030-gpio.o
obj-$(CONFIG_GPIO_XILINX) += xilinx_gpio.o
obj-$(CONFIG_GPIO_BT8XX) += bt8xxgpio.o
diff --git a/drivers/gpio/max7301.c b/drivers/gpio/max7301.c
index 3e7f4e06386..7b82eaae262 100644
--- a/drivers/gpio/max7301.c
+++ b/drivers/gpio/max7301.c
@@ -287,7 +287,7 @@ exit_destroy:
return ret;
}
-static int max7301_remove(struct spi_device *spi)
+static int __devexit max7301_remove(struct spi_device *spi)
{
struct max7301 *ts;
int ret;
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 8dc0164bd51..cdb6574d25a 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -15,6 +15,10 @@
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/i2c/pca953x.h>
+#ifdef CONFIG_OF_GPIO
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#endif
#include <asm/gpio.h>
@@ -32,6 +36,7 @@ static const struct i2c_device_id pca953x_id[] = {
{ "pca9539", 16, },
{ "pca9554", 8, },
{ "pca9555", 16, },
+ { "pca9556", 8, },
{ "pca9557", 8, },
{ "max7310", 8, },
@@ -49,7 +54,9 @@ struct pca953x_chip {
uint16_t reg_direction;
struct i2c_client *client;
+ struct pca953x_platform_data *dyn_pdata;
struct gpio_chip gpio_chip;
+ char **names;
};
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
@@ -192,8 +199,57 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
gc->label = chip->client->name;
gc->dev = &chip->client->dev;
gc->owner = THIS_MODULE;
+ gc->names = chip->names;
}
+/*
+ * Handlers for alternative sources of platform_data
+ */
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ struct pca953x_platform_data *pdata;
+ struct device_node *node;
+ const uint16_t *val;
+
+ node = dev_archdata_get_node(&client->dev.archdata);
+ if (node == NULL)
+ return NULL;
+
+ pdata = kzalloc(sizeof(struct pca953x_platform_data), GFP_KERNEL);
+ if (pdata == NULL) {
+ dev_err(&client->dev, "Unable to allocate platform_data\n");
+ return NULL;
+ }
+
+ pdata->gpio_base = -1;
+ val = of_get_property(node, "linux,gpio-base", NULL);
+ if (val) {
+ if (*val < 0)
+ dev_warn(&client->dev,
+ "invalid gpio-base in device tree\n");
+ else
+ pdata->gpio_base = *val;
+ }
+
+ val = of_get_property(node, "polarity", NULL);
+ if (val)
+ pdata->invert = *val;
+
+ return pdata;
+}
+#else
+static struct pca953x_platform_data *
+pca953x_get_alt_pdata(struct i2c_client *client)
+{
+ return NULL;
+}
+#endif
+
static int __devinit pca953x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -201,20 +257,32 @@ static int __devinit pca953x_probe(struct i2c_client *client,
struct pca953x_chip *chip;
int ret;
+ chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
+ if (chip == NULL)
+ return -ENOMEM;
+
pdata = client->dev.platform_data;
if (pdata == NULL) {
- dev_dbg(&client->dev, "no platform data\n");
- return -EINVAL;
+ pdata = pca953x_get_alt_pdata(client);
+ /*
+ * Unlike normal platform_data, this is allocated
+ * dynamically and must be freed in the driver
+ */
+ chip->dyn_pdata = pdata;
}
- chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
- if (chip == NULL)
- return -ENOMEM;
+ if (pdata == NULL) {
+ dev_dbg(&client->dev, "no platform data\n");
+ ret = -EINVAL;
+ goto out_failed;
+ }
chip->client = client;
chip->gpio_start = pdata->gpio_base;
+ chip->names = pdata->names;
+
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
@@ -249,6 +317,7 @@ static int __devinit pca953x_probe(struct i2c_client *client,
return 0;
out_failed:
+ kfree(chip->dyn_pdata);
kfree(chip);
return ret;
}
@@ -276,6 +345,7 @@ static int pca953x_remove(struct i2c_client *client)
return ret;
}
+ kfree(chip->dyn_pdata);
kfree(chip);
return 0;
}
diff --git a/drivers/gpio/pl061.c b/drivers/gpio/pl061.c
new file mode 100644
index 00000000000..aa8e7cb020d
--- /dev/null
+++ b/drivers/gpio/pl061.c
@@ -0,0 +1,341 @@
+/*
+ * linux/drivers/gpio/pl061.c
+ *
+ * Copyright (C) 2008, 2009 Provigent Ltd.
+ *
+ * This program 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.
+ *
+ * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
+ *
+ * Data sheet: ARM DDI 0190B, September 2000
+ */
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/irq.h>
+#include <linux/bitops.h>
+#include <linux/workqueue.h>
+#include <linux/gpio.h>
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/amba/pl061.h>
+
+#define GPIODIR 0x400
+#define GPIOIS 0x404
+#define GPIOIBE 0x408
+#define GPIOIEV 0x40C
+#define GPIOIE 0x410
+#define GPIORIS 0x414
+#define GPIOMIS 0x418
+#define GPIOIC 0x41C
+
+#define PL061_GPIO_NR 8
+
+struct pl061_gpio {
+ /* We use a list of pl061_gpio structs for each trigger IRQ in the main
+ * interrupts controller of the system. We need this to support systems
+ * in which more that one PL061s are connected to the same IRQ. The ISR
+ * interates through this list to find the source of the interrupt.
+ */
+ struct list_head list;
+
+ /* Each of the two spinlocks protects a different set of hardware
+ * regiters and data structurs. This decouples the code of the IRQ from
+ * the GPIO code. This also makes the case of a GPIO routine call from
+ * the IRQ code simpler.
+ */
+ spinlock_t lock; /* GPIO registers */
+ spinlock_t irq_lock; /* IRQ registers */
+
+ void __iomem *base;
+ unsigned irq_base;
+ struct gpio_chip gc;
+};
+
+static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+ unsigned long flags;
+ unsigned char gpiodir;
+
+ if (offset >= gc->ngpio)
+ return -EINVAL;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ gpiodir = readb(chip->base + GPIODIR);
+ gpiodir &= ~(1 << offset);
+ writeb(gpiodir, chip->base + GPIODIR);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ return 0;
+}
+
+static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
+ int value)
+{
+ struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+ unsigned long flags;
+ unsigned char gpiodir;
+
+ if (offset >= gc->ngpio)
+ return -EINVAL;
+
+ spin_lock_irqsave(&chip->lock, flags);
+ writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+ gpiodir = readb(chip->base + GPIODIR);
+ gpiodir |= 1 << offset;
+ writeb(gpiodir, chip->base + GPIODIR);
+ spin_unlock_irqrestore(&chip->lock, flags);
+
+ return 0;
+}
+
+static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
+{
+ struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+ return !!readb(chip->base + (1 << (offset + 2)));
+}
+
+static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+ writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+}
+
+/*
+ * PL061 GPIO IRQ
+ */
+static void pl061_irq_disable(unsigned irq)
+{
+ struct pl061_gpio *chip = get_irq_chip_data(irq);
+ int offset = irq - chip->irq_base;
+ unsigned long flags;
+ u8 gpioie;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ gpioie = readb(chip->base + GPIOIE);
+ gpioie &= ~(1 << offset);
+ writeb(gpioie, chip->base + GPIOIE);
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+}
+
+static void pl061_irq_enable(unsigned irq)
+{
+ struct pl061_gpio *chip = get_irq_chip_data(irq);
+ int offset = irq - chip->irq_base;
+ unsigned long flags;
+ u8 gpioie;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+ gpioie = readb(chip->base + GPIOIE);
+ gpioie |= 1 << offset;
+ writeb(gpioie, chip->base + GPIOIE);
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+}
+
+static int pl061_irq_type(unsigned irq, unsigned trigger)
+{
+ struct pl061_gpio *chip = get_irq_chip_data(irq);
+ int offset = irq - chip->irq_base;
+ unsigned long flags;
+ u8 gpiois, gpioibe, gpioiev;
+
+ if (offset < 0 || offset > PL061_GPIO_NR)
+ return -EINVAL;
+
+ spin_lock_irqsave(&chip->irq_lock, flags);
+
+ gpioiev = readb(chip->base + GPIOIEV);
+
+ gpiois = readb(chip->base + GPIOIS);
+ if (trigger & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
+ gpiois |= 1 << offset;
+ if (trigger & IRQ_TYPE_LEVEL_HIGH)
+ gpioiev |= 1 << offset;
+ else
+ gpioiev &= ~(1 << offset);
+ } else
+ gpiois &= ~(1 << offset);
+ writeb(gpiois, chip->base + GPIOIS);
+
+ gpioibe = readb(chip->base + GPIOIBE);
+ if ((trigger & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH)
+ gpioibe |= 1 << offset;
+ else {
+ gpioibe &= ~(1 << offset);
+ if (trigger & IRQ_TYPE_EDGE_RISING)
+ gpioiev |= 1 << offset;
+ else
+ gpioiev &= ~(1 << offset);
+ }
+ writeb(gpioibe, chip->base + GPIOIBE);
+
+ writeb(gpioiev, chip->base + GPIOIEV);
+
+ spin_unlock_irqrestore(&chip->irq_lock, flags);
+
+ return 0;
+}
+
+static struct irq_chip pl061_irqchip = {
+ .name = "GPIO",
+ .enable = pl061_irq_enable,
+ .disable = pl061_irq_disable,
+ .set_type = pl061_irq_type,
+};
+
+static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct list_head *chip_list = get_irq_chip_data(irq);
+ struct list_head *ptr;
+ struct pl061_gpio *chip;
+
+ desc->chip->ack(irq);
+ list_for_each(ptr, chip_list) {
+ unsigned long pending;
+ int gpio;
+
+ chip = list_entry(ptr, struct pl061_gpio, list);
+ pending = readb(chip->base + GPIOMIS);
+ writeb(pending, chip->base + GPIOIC);
+
+ if (pending == 0)
+ continue;
+
+ for_each_bit(gpio, &pending, PL061_GPIO_NR)
+ generic_handle_irq(gpio_to_irq(gpio));
+ }
+ desc->chip->unmask(irq);
+}
+
+static int __init pl061_probe(struct amba_device *dev, struct amba_id *id)
+{
+ struct pl061_platform_data *pdata;
+ struct pl061_gpio *chip;
+ struct list_head *chip_list;
+ int ret, irq, i;
+ static unsigned long init_irq[BITS_TO_LONGS(NR_IRQS)];
+
+ pdata = dev->dev.platform_data;
+ if (pdata == NULL)
+ return -ENODEV;
+
+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+ if (chip == NULL)
+ return -ENOMEM;
+
+ if (!request_mem_region(dev->res.start,
+ resource_size(&dev->res), "pl061")) {
+ ret = -EBUSY;
+ goto free_mem;
+ }
+
+ chip->base = ioremap(dev->res.start, resource_size(&dev->res));
+ if (chip->base == NULL) {
+ ret = -ENOMEM;
+ goto release_region;
+ }
+
+ spin_lock_init(&chip->lock);
+ spin_lock_init(&chip->irq_lock);
+ INIT_LIST_HEAD(&chip->list);
+
+ chip->gc.direction_input = pl061_direction_input;
+ chip->gc.direction_output = pl061_direction_output;
+ chip->gc.get = pl061_get_value;
+ chip->gc.set = pl061_set_value;
+ chip->gc.base = pdata->gpio_base;
+ chip->gc.ngpio = PL061_GPIO_NR;
+ chip->gc.label = dev_name(&dev->dev);
+ chip->gc.dev = &dev->dev;
+ chip->gc.owner = THIS_MODULE;
+
+ chip->irq_base = pdata->irq_base;
+
+ ret = gpiochip_add(&chip->gc);
+ if (ret)
+ goto iounmap;
+
+ /*
+ * irq_chip support
+ */
+
+ if (chip->irq_base == (unsigned) -1)
+ return 0;
+
+ writeb(0, chip->base + GPIOIE); /* disable irqs */
+ irq = dev->irq[0];
+ if (irq < 0) {
+ ret = -ENODEV;
+ goto iounmap;
+ }
+ set_irq_chained_handler(irq, pl061_irq_handler);
+ if (!test_and_set_bit(irq, init_irq)) { /* list initialized? */
+ chip_list = kmalloc(sizeof(*chip_list), GFP_KERNEL);
+ if (chip_list == NULL) {
+ ret = -ENOMEM;
+ goto iounmap;
+ }
+ INIT_LIST_HEAD(chip_list);
+ set_irq_chip_data(irq, chip_list);
+ } else
+ chip_list = get_irq_chip_data(irq);
+ list_add(&chip->list, chip_list);
+
+ for (i = 0; i < PL061_GPIO_NR; i++) {
+ if (pdata->directions & (1 << i))
+ pl061_direction_output(&chip->gc, i,
+ pdata->values & (1 << i));
+ else
+ pl061_direction_input(&chip->gc, i);
+
+ set_irq_chip(i+chip->irq_base, &pl061_irqchip);
+ set_irq_handler(i+chip->irq_base, handle_simple_irq);
+ set_irq_flags(i+chip->irq_base, IRQF_VALID);
+ set_irq_chip_data(i+chip->irq_base, chip);
+ }
+
+ return 0;
+
+iounmap:
+ iounmap(chip->base);
+release_region:
+ release_mem_region(dev->res.start, resource_size(&dev->res));
+free_mem:
+ kfree(chip);
+
+ return ret;
+}
+
+static struct amba_id pl061_ids[] __initdata = {
+ {
+ .id = 0x00041061,
+ .mask = 0x000fffff,
+ },
+ { 0, 0 },
+};
+
+static struct amba_driver pl061_gpio_driver = {
+ .drv = {
+ .name = "pl061_gpio",
+ },
+ .id_table = pl061_ids,
+ .probe = pl061_probe,
+};
+
+static int __init pl061_gpio_init(void)
+{
+ return amba_driver_register(&pl061_gpio_driver);
+}
+subsys_initcall(pl061_gpio_init);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("PL061 GPIO driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-14 08:35:20 +0000