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path: root/drivers/gpio/gpio-mxc.c
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Diffstat (limited to 'drivers/gpio/gpio-mxc.c')
-rw-r--r--drivers/gpio/gpio-mxc.c123
1 files changed, 75 insertions, 48 deletions
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index 04691d3abe6..db83b3c0a44 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -19,11 +19,13 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
+#include <linux/err.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -32,12 +34,12 @@
#include <linux/of_device.h>
#include <linux/module.h>
#include <asm-generic/bug.h>
-#include <asm/mach/irq.h>
enum mxc_gpio_hwtype {
IMX1_GPIO, /* runs on i.mx1 */
IMX21_GPIO, /* runs on i.mx21 and i.mx27 */
- IMX31_GPIO, /* runs on all other i.mx */
+ IMX31_GPIO, /* runs on i.mx31 */
+ IMX35_GPIO, /* runs on all other i.mx */
};
/* device type dependent stuff */
@@ -49,6 +51,7 @@ struct mxc_gpio_hwdata {
unsigned icr2_reg;
unsigned imr_reg;
unsigned isr_reg;
+ int edge_sel_reg;
unsigned low_level;
unsigned high_level;
unsigned rise_edge;
@@ -73,6 +76,7 @@ static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = {
.icr2_reg = 0x2c,
.imr_reg = 0x30,
.isr_reg = 0x34,
+ .edge_sel_reg = -EINVAL,
.low_level = 0x03,
.high_level = 0x02,
.rise_edge = 0x00,
@@ -87,6 +91,22 @@ static struct mxc_gpio_hwdata imx31_gpio_hwdata = {
.icr2_reg = 0x10,
.imr_reg = 0x14,
.isr_reg = 0x18,
+ .edge_sel_reg = -EINVAL,
+ .low_level = 0x00,
+ .high_level = 0x01,
+ .rise_edge = 0x02,
+ .fall_edge = 0x03,
+};
+
+static struct mxc_gpio_hwdata imx35_gpio_hwdata = {
+ .dr_reg = 0x00,
+ .gdir_reg = 0x04,
+ .psr_reg = 0x08,
+ .icr1_reg = 0x0c,
+ .icr2_reg = 0x10,
+ .imr_reg = 0x14,
+ .isr_reg = 0x18,
+ .edge_sel_reg = 0x1c,
.low_level = 0x00,
.high_level = 0x01,
.rise_edge = 0x02,
@@ -103,12 +123,13 @@ static struct mxc_gpio_hwdata *mxc_gpio_hwdata;
#define GPIO_ICR2 (mxc_gpio_hwdata->icr2_reg)
#define GPIO_IMR (mxc_gpio_hwdata->imr_reg)
#define GPIO_ISR (mxc_gpio_hwdata->isr_reg)
+#define GPIO_EDGE_SEL (mxc_gpio_hwdata->edge_sel_reg)
#define GPIO_INT_LOW_LEV (mxc_gpio_hwdata->low_level)
#define GPIO_INT_HIGH_LEV (mxc_gpio_hwdata->high_level)
#define GPIO_INT_RISE_EDGE (mxc_gpio_hwdata->rise_edge)
#define GPIO_INT_FALL_EDGE (mxc_gpio_hwdata->fall_edge)
-#define GPIO_INT_NONE 0x4
+#define GPIO_INT_BOTH_EDGES 0x4
static struct platform_device_id mxc_gpio_devtype[] = {
{
@@ -121,6 +142,9 @@ static struct platform_device_id mxc_gpio_devtype[] = {
.name = "imx31-gpio",
.driver_data = IMX31_GPIO,
}, {
+ .name = "imx35-gpio",
+ .driver_data = IMX35_GPIO,
+ }, {
/* sentinel */
}
};
@@ -129,6 +153,7 @@ static const struct of_device_id mxc_gpio_dt_ids[] = {
{ .compatible = "fsl,imx1-gpio", .data = &mxc_gpio_devtype[IMX1_GPIO], },
{ .compatible = "fsl,imx21-gpio", .data = &mxc_gpio_devtype[IMX21_GPIO], },
{ .compatible = "fsl,imx31-gpio", .data = &mxc_gpio_devtype[IMX31_GPIO], },
+ { .compatible = "fsl,imx35-gpio", .data = &mxc_gpio_devtype[IMX35_GPIO], },
{ /* sentinel */ }
};
@@ -160,15 +185,19 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
edge = GPIO_INT_FALL_EDGE;
break;
case IRQ_TYPE_EDGE_BOTH:
- val = gpio_get_value(gpio);
- if (val) {
- edge = GPIO_INT_LOW_LEV;
- pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
+ if (GPIO_EDGE_SEL >= 0) {
+ edge = GPIO_INT_BOTH_EDGES;
} else {
- edge = GPIO_INT_HIGH_LEV;
- pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
+ val = gpio_get_value(gpio);
+ if (val) {
+ edge = GPIO_INT_LOW_LEV;
+ pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
+ } else {
+ edge = GPIO_INT_HIGH_LEV;
+ pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
+ }
+ port->both_edges |= 1 << gpio_idx;
}
- port->both_edges |= 1 << gpio_idx;
break;
case IRQ_TYPE_LEVEL_LOW:
edge = GPIO_INT_LOW_LEV;
@@ -180,10 +209,23 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
return -EINVAL;
}
- reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* ICR1 or ICR2 */
- bit = gpio_idx & 0xf;
- val = readl(reg) & ~(0x3 << (bit << 1));
- writel(val | (edge << (bit << 1)), reg);
+ if (GPIO_EDGE_SEL >= 0) {
+ val = readl(port->base + GPIO_EDGE_SEL);
+ if (edge == GPIO_INT_BOTH_EDGES)
+ writel(val | (1 << gpio_idx),
+ port->base + GPIO_EDGE_SEL);
+ else
+ writel(val & ~(1 << gpio_idx),
+ port->base + GPIO_EDGE_SEL);
+ }
+
+ if (edge != GPIO_INT_BOTH_EDGES) {
+ reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */
+ bit = gpio_idx & 0xf;
+ val = readl(reg) & ~(0x3 << (bit << 1));
+ writel(val | (edge << (bit << 1)), reg);
+ }
+
writel(1 << gpio_idx, port->base + GPIO_ISR);
return 0;
@@ -250,6 +292,9 @@ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
u32 irq_msk, irq_stat;
struct mxc_gpio_port *port;
+ struct irq_chip *chip = irq_get_chip(irq);
+
+ chained_irq_enter(chip, desc);
/* walk through all interrupt status registers */
list_for_each_entry(port, &mxc_gpio_ports, node) {
@@ -261,6 +306,7 @@ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
if (irq_stat)
mxc_gpio_irq_handler(port, irq_stat);
}
+ chained_irq_exit(chip, desc);
}
/*
@@ -315,7 +361,7 @@ static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base)
IRQ_NOREQUEST, 0);
}
-static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
+static void mxc_gpio_get_hw(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(mxc_gpio_dt_ids, &pdev->dev);
@@ -335,7 +381,9 @@ static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
return;
}
- if (hwtype == IMX31_GPIO)
+ if (hwtype == IMX35_GPIO)
+ mxc_gpio_hwdata = &imx35_gpio_hwdata;
+ else if (hwtype == IMX31_GPIO)
mxc_gpio_hwdata = &imx31_gpio_hwdata;
else
mxc_gpio_hwdata = &imx1_imx21_gpio_hwdata;
@@ -352,7 +400,7 @@ static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
return irq_find_mapping(port->domain, offset);
}
-static int __devinit mxc_gpio_probe(struct platform_device *pdev)
+static int mxc_gpio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mxc_gpio_port *port;
@@ -362,34 +410,19 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
mxc_gpio_get_hw(pdev);
- port = kzalloc(sizeof(struct mxc_gpio_port), GFP_KERNEL);
+ port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!iores) {
- err = -ENODEV;
- goto out_kfree;
- }
-
- if (!request_mem_region(iores->start, resource_size(iores),
- pdev->name)) {
- err = -EBUSY;
- goto out_kfree;
- }
-
- port->base = ioremap(iores->start, resource_size(iores));
- if (!port->base) {
- err = -ENOMEM;
- goto out_release_mem;
- }
+ port->base = devm_ioremap_resource(&pdev->dev, iores);
+ if (IS_ERR(port->base))
+ return PTR_ERR(port->base);
port->irq_high = platform_get_irq(pdev, 1);
port->irq = platform_get_irq(pdev, 0);
- if (port->irq < 0) {
- err = -EINVAL;
- goto out_iounmap;
- }
+ if (port->irq < 0)
+ return port->irq;
/* disable the interrupt and clear the status */
writel(0, port->base + GPIO_IMR);
@@ -419,12 +452,11 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
port->base + GPIO_DR, NULL,
port->base + GPIO_GDIR, NULL, 0);
if (err)
- goto out_iounmap;
+ goto out_bgio;
port->bgc.gc.to_irq = mxc_gpio_to_irq;
- port->bgc.gc.base = pdev->id * 32;
- port->bgc.dir = port->bgc.read_reg(port->bgc.reg_dir);
- port->bgc.data = port->bgc.read_reg(port->bgc.reg_set);
+ port->bgc.gc.base = (pdev->id < 0) ? of_alias_get_id(np, "gpio") * 32 :
+ pdev->id * 32;
err = gpiochip_add(&port->bgc.gc);
if (err)
@@ -456,12 +488,7 @@ out_gpiochip_remove:
WARN_ON(gpiochip_remove(&port->bgc.gc) < 0);
out_bgpio_remove:
bgpio_remove(&port->bgc);
-out_iounmap:
- iounmap(port->base);
-out_release_mem:
- release_mem_region(iores->start, resource_size(iores));
-out_kfree:
- kfree(port);
+out_bgio:
dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err);
return err;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-13 03:07:25 +0000