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Message-Id: <1305885089-27343-5-git-send-email-shawn.guo@linaro.org>
Date: Fri, 20 May 2011 17:51:29 +0800
From: Shawn Guo <shawn.guo@...aro.org>
To: linux-kernel@...r.kernel.org
Cc: grant.likely@...retlab.ca, linus.walleij@...aro.org,
kernel@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
patches@...aro.org, Shawn Guo <shawn.guo@...aro.org>
Subject: [PATCH 4/4] gpio: gpio-mxs: add gpio driver for Freescale MXS architecture
Add gpio-mxs driver by moving arch/arm/mach-mxs/gpio.c into
drivers/gpio.
Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
---
drivers/gpio/Kconfig | 3 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-mxs.c | 168 ++++++++++++++++++++++++++++++++++-------------
3 files changed, 125 insertions(+), 47 deletions(-)
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d3b2953..ccca658 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -81,6 +81,9 @@ config GPIO_IT8761E
help
Say yes here to support GPIO functionality of IT8761E super I/O chip.
+config GPIO_MXS
+ bool
+
config GPIO_PL061
bool "PrimeCell PL061 GPIO support"
depends on ARM_AMBA
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index becef59..b06a335 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_GPIO_MAX7301) += max7301.o
obj-$(CONFIG_GPIO_MAX732X) += max732x.o
obj-$(CONFIG_GPIO_MC33880) += mc33880.o
obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
+obj-$(CONFIG_GPIO_MXS) += gpio-mxs.o
obj-$(CONFIG_GPIO_74X164) += 74x164.o
obj-$(CONFIG_GPIO_PCA953X) += pca953x.o
obj-$(CONFIG_GPIO_PCF857X) += pcf857x.o
diff --git a/drivers/gpio/gpio-mxs.c b/drivers/gpio/gpio-mxs.c
index 6a59bf2..b33b2bc 100644
--- a/drivers/gpio/gpio-mxs.c
+++ b/drivers/gpio/gpio-mxs.c
@@ -25,14 +25,18 @@
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
-#include <mach/mx23.h>
-#include <mach/mx28.h>
-#include <asm-generic/bug.h>
-
-#include "gpio.h"
-
-static struct mxs_gpio_port *mxs_gpio_ports;
-static int gpio_table_size;
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <mach/mxs.h>
+
+struct mxs_gpio_port {
+ void __iomem *base;
+ int id;
+ int irq;
+ int irq_high;
+ int virtual_irq_start;
+ struct gpio_chip chip;
+};
#define MXS_SET 0x4
#define MXS_CLR 0x8
@@ -76,20 +80,23 @@ static void set_gpio_irqenable(struct mxs_gpio_port *port, u32 index,
static void mxs_gpio_ack_irq(struct irq_data *d)
{
+ struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
u32 gpio = irq_to_gpio(d->irq);
- clear_gpio_irqstatus(&mxs_gpio_ports[gpio / 32], gpio & 0x1f);
+ clear_gpio_irqstatus(port, gpio & 0x1f);
}
static void mxs_gpio_mask_irq(struct irq_data *d)
{
+ struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
u32 gpio = irq_to_gpio(d->irq);
- set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 0);
+ set_gpio_irqenable(port, gpio & 0x1f, 0);
}
static void mxs_gpio_unmask_irq(struct irq_data *d)
{
+ struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
u32 gpio = irq_to_gpio(d->irq);
- set_gpio_irqenable(&mxs_gpio_ports[gpio / 32], gpio & 0x1f, 1);
+ set_gpio_irqenable(port, gpio & 0x1f, 1);
}
static int mxs_gpio_get(struct gpio_chip *chip, unsigned offset);
@@ -98,7 +105,7 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
{
u32 gpio = irq_to_gpio(d->irq);
u32 pin_mask = 1 << (gpio & 31);
- struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
+ struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
void __iomem *pin_addr;
int edge;
@@ -142,7 +149,7 @@ static int mxs_gpio_set_irq_type(struct irq_data *d, unsigned int type)
static void mxs_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
u32 irq_stat;
- struct mxs_gpio_port *port = (struct mxs_gpio_port *)irq_get_handler_data(irq);
+ struct mxs_gpio_port *port = irq_get_handler_data(irq);
u32 gpio_irq_no_base = port->virtual_irq_start;
desc->irq_data.chip->irq_ack(&desc->irq_data);
@@ -170,7 +177,7 @@ static int mxs_gpio_set_wake_irq(struct irq_data *d, unsigned int enable)
{
u32 gpio = irq_to_gpio(d->irq);
u32 gpio_idx = gpio & 0x1f;
- struct mxs_gpio_port *port = &mxs_gpio_ports[gpio / 32];
+ struct mxs_gpio_port *port = irq_data_get_irq_chip_data(d);
if (enable) {
if (port->irq_high && (gpio_idx >= 16))
@@ -251,47 +258,114 @@ static int mxs_gpio_direction_output(struct gpio_chip *chip,
return 0;
}
-int __init mxs_gpio_init(struct mxs_gpio_port *port, int cnt)
+static int __devinit mxs_gpio_probe(struct platform_device *pdev)
{
- int i, j;
+ static void __iomem *base;
+ struct mxs_gpio_port *port;
+ struct resource *iores = NULL;
+ int err, i;
+
+ port = kzalloc(sizeof(struct mxs_gpio_port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->id = pdev->id;
+ port->virtual_irq_start = MXS_GPIO_IRQ_START + port->id * 32;
+
+ /*
+ * map memory region only once, as all the gpio ports
+ * share the same one
+ */
+ if (!base) {
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iores) {
+ err = -ENODEV;
+ goto out_kfree;
+ }
- /* save for local usage */
- mxs_gpio_ports = port;
- gpio_table_size = cnt;
+ if (!request_mem_region(iores->start, resource_size(iores),
+ pdev->name)) {
+ err = -EBUSY;
+ goto out_kfree;
+ }
- pr_info("MXS GPIO hardware\n");
+ base = ioremap(iores->start, resource_size(iores));
+ if (!base) {
+ err = -ENOMEM;
+ goto out_release_mem;
+ }
+ }
+ port->base = base;
- for (i = 0; i < cnt; i++) {
- /* disable the interrupt and clear the status */
- writel(0, port[i].base + PINCTRL_PIN2IRQ(i));
- writel(0, port[i].base + PINCTRL_IRQEN(i));
+ port->irq = platform_get_irq(pdev, 0);
+ if (port->irq < 0) {
+ err = -EINVAL;
+ goto out_iounmap;
+ }
- /* clear address has to be used to clear IRQSTAT bits */
- writel(~0U, port[i].base + PINCTRL_IRQSTAT(i) + MXS_CLR);
+ /* disable the interrupt and clear the status */
+ writel(0, port->base + PINCTRL_PIN2IRQ(port->id));
+ writel(0, port->base + PINCTRL_IRQEN(port->id));
- for (j = port[i].virtual_irq_start;
- j < port[i].virtual_irq_start + 32; j++) {
- irq_set_chip_and_handler(j, &gpio_irq_chip,
- handle_level_irq);
- set_irq_flags(j, IRQF_VALID);
- }
+ /* clear address has to be used to clear IRQSTAT bits */
+ writel(~0U, port->base + PINCTRL_IRQSTAT(port->id) + MXS_CLR);
- /* setup one handler for each entry */
- irq_set_chained_handler(port[i].irq, mxs_gpio_irq_handler);
- irq_set_handler_data(port[i].irq, &port[i]);
-
- /* register gpio chip */
- port[i].chip.direction_input = mxs_gpio_direction_input;
- port[i].chip.direction_output = mxs_gpio_direction_output;
- port[i].chip.get = mxs_gpio_get;
- port[i].chip.set = mxs_gpio_set;
- port[i].chip.to_irq = mxs_gpio_to_irq;
- port[i].chip.base = i * 32;
- port[i].chip.ngpio = 32;
-
- /* its a serious configuration bug when it fails */
- BUG_ON(gpiochip_add(&port[i].chip) < 0);
+ for (i = port->virtual_irq_start;
+ i < port->virtual_irq_start + 32; i++) {
+ irq_set_chip_and_handler(i, &gpio_irq_chip,
+ handle_level_irq);
+ set_irq_flags(i, IRQF_VALID);
+ irq_set_chip_data(i, port);
}
+ /* setup one handler for each entry */
+ irq_set_chained_handler(port->irq, mxs_gpio_irq_handler);
+ irq_set_handler_data(port->irq, port);
+
+ /* register gpio chip */
+ port->chip.direction_input = mxs_gpio_direction_input;
+ port->chip.direction_output = mxs_gpio_direction_output;
+ port->chip.get = mxs_gpio_get;
+ port->chip.set = mxs_gpio_set;
+ port->chip.to_irq = mxs_gpio_to_irq;
+ port->chip.base = port->id * 32;
+ port->chip.ngpio = 32;
+
+ err = gpiochip_add(&port->chip);
+ if (err)
+ goto out_iounmap;
+
+ platform_set_drvdata(pdev, port);
+
return 0;
+
+out_iounmap:
+ if (iores)
+ iounmap(port->base);
+out_release_mem:
+ if (iores)
+ release_mem_region(iores->start, resource_size(iores));
+out_kfree:
+ kfree(port);
+ dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
+ return err;
+}
+
+static struct platform_driver mxs_gpio_driver = {
+ .driver = {
+ .name = "mxs-gpio",
+ },
+ .probe = mxs_gpio_probe,
+};
+
+static int __init mxs_gpio_init(void)
+{
+ return platform_driver_register(&mxs_gpio_driver);
}
+postcore_initcall(mxs_gpio_init);
+
+MODULE_AUTHOR("Freescale Semiconductor, "
+ "Daniel Mack <danielncaiaq.de>, "
+ "Juergen Beisert <kernel@...gutronix.de>");
+MODULE_DESCRIPTION("Freescale MXS GPIO");
+MODULE_LICENSE("GPL");
--
1.7.4.1
--
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