[PATCH v2 6/7] gpio/mxc: adopt irq_domain for gpio interrupt support
Shawn Guo
shawn.guo at linaro.org
Wed Feb 15 13:47:47 EST 2012
It adopts irq_domain for imx gpio interrupt support, and fixes the
translation between irq and gpio number for DT users.
As the results, macro MXC_GPIO_IRQ_START is referenced nowhere in
gpio-mxc driver, and the gpio irq_domain initilization in DT platform
code is removed.
Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
---
arch/arm/mach-imx/mach-imx6q.c | 14 ---------
arch/arm/mach-mx5/imx51-dt.c | 12 --------
arch/arm/mach-mx5/imx53-dt.c | 12 --------
drivers/gpio/gpio-mxc.c | 59 ++++++++++++++++-----------------------
4 files changed, 24 insertions(+), 73 deletions(-)
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c
index 6075d4d..8268471 100644
--- a/arch/arm/mach-imx/mach-imx6q.c
+++ b/arch/arm/mach-imx/mach-imx6q.c
@@ -14,7 +14,6 @@
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
-#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
@@ -91,21 +90,8 @@ static void __init imx6q_map_io(void)
imx6q_clock_map_io();
}
-static int __init imx6q_gpio_add_irq_domain(struct device_node *np,
- struct device_node *interrupt_parent)
-{
- static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
-
- gpio_irq_base -= 32;
- irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops,
- NULL);
-
- return 0;
-}
-
static const struct of_device_id imx6q_irq_match[] __initconst = {
{ .compatible = "arm,cortex-a9-gic", .data = gic_of_init, },
- { .compatible = "fsl,imx6q-gpio", .data = imx6q_gpio_add_irq_domain, },
{ /* sentinel */ }
};
diff --git a/arch/arm/mach-mx5/imx51-dt.c b/arch/arm/mach-mx5/imx51-dt.c
index 636ef34..035a147 100644
--- a/arch/arm/mach-mx5/imx51-dt.c
+++ b/arch/arm/mach-mx5/imx51-dt.c
@@ -56,20 +56,8 @@ static int __init imx51_tzic_init_cb(struct device_node *np,
return 0;
}
-static int __init imx51_gpio_add_irq_domain(struct device_node *np,
- struct device_node *interrupt_parent)
-{
- static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
-
- gpio_irq_base -= 32;
- irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, NULL);
-
- return 0;
-}
-
static const struct of_device_id imx51_irq_match[] __initconst = {
{ .compatible = "fsl,imx51-tzic", .data = imx51_tzic_init_cb, },
- { .compatible = "fsl,imx51-gpio", .data = imx51_gpio_add_irq_domain, },
{ /* sentinel */ }
};
diff --git a/arch/arm/mach-mx5/imx53-dt.c b/arch/arm/mach-mx5/imx53-dt.c
index ce2b700..d59f4db 100644
--- a/arch/arm/mach-mx5/imx53-dt.c
+++ b/arch/arm/mach-mx5/imx53-dt.c
@@ -60,20 +60,8 @@ static int __init imx53_tzic_init_cb(struct device_node *np,
return 0;
}
-static int __init imx53_gpio_add_irq_domain(struct device_node *np,
- struct device_node *interrupt_parent)
-{
- static int gpio_irq_base = MXC_GPIO_IRQ_START + ARCH_NR_GPIOS;
-
- gpio_irq_base -= 32;
- irq_domain_add_legacy(np, 32, gpio_irq_base, 0, &irq_domain_simple_ops, NULL);
-
- return 0;
-}
-
static const struct of_device_id imx53_irq_match[] __initconst = {
{ .compatible = "fsl,imx53-tzic", .data = imx53_tzic_init_cb, },
- { .compatible = "fsl,imx53-gpio", .data = imx53_gpio_add_irq_domain, },
{ /* sentinel */ }
};
diff --git a/drivers/gpio/gpio-mxc.c b/drivers/gpio/gpio-mxc.c
index e791476..0b15787 100644
--- a/drivers/gpio/gpio-mxc.c
+++ b/drivers/gpio/gpio-mxc.c
@@ -23,6 +23,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/gpio.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -33,8 +34,6 @@
#include <asm-generic/bug.h>
#include <asm/mach/irq.h>
-#define irq_to_gpio(irq) ((irq) - MXC_GPIO_IRQ_START)
-
enum mxc_gpio_hwtype {
IMX1_GPIO, /* runs on i.mx1 */
IMX21_GPIO, /* runs on i.mx21 and i.mx27 */
@@ -61,7 +60,7 @@ struct mxc_gpio_port {
void __iomem *base;
int irq;
int irq_high;
- int virtual_irq_start;
+ struct irq_chip_generic *irq_gc;
struct bgpio_chip bgc;
u32 both_edges;
};
@@ -144,14 +143,15 @@ static LIST_HEAD(mxc_gpio_ports);
static int gpio_set_irq_type(struct irq_data *d, u32 type)
{
- u32 gpio = irq_to_gpio(d->irq);
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct mxc_gpio_port *port = gc->private;
+ u32 gpio_idx = d->hwirq;
+ u32 gpio = port->bgc.gc.base + gpio_idx;
u32 bit, val;
int edge;
void __iomem *reg = port->base;
- port->both_edges &= ~(1 << (gpio & 31));
+ port->both_edges &= ~(1 << gpio_idx);
switch (type) {
case IRQ_TYPE_EDGE_RISING:
edge = GPIO_INT_RISE_EDGE;
@@ -168,7 +168,7 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
edge = GPIO_INT_HIGH_LEV;
pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
}
- port->both_edges |= 1 << (gpio & 31);
+ port->both_edges |= 1 << gpio_idx;
break;
case IRQ_TYPE_LEVEL_LOW:
edge = GPIO_INT_LOW_LEV;
@@ -180,11 +180,11 @@ static int gpio_set_irq_type(struct irq_data *d, u32 type)
return -EINVAL;
}
- reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
- bit = gpio & 0xf;
+ 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);
- writel(1 << (gpio & 0x1f), port->base + GPIO_ISR);
+ writel(1 << gpio_idx, port->base + GPIO_ISR);
return 0;
}
@@ -217,15 +217,14 @@ static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
/* handle 32 interrupts in one status register */
static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
{
- u32 gpio_irq_no_base = port->virtual_irq_start;
-
while (irq_stat != 0) {
int irqoffset = fls(irq_stat) - 1;
if (port->both_edges & (1 << irqoffset))
mxc_flip_edge(port, irqoffset);
- generic_handle_irq(gpio_irq_no_base + irqoffset);
+ generic_handle_irq(irq_find_mapping(port->irq_gc->domain,
+ irqoffset));
irq_stat &= ~(1 << irqoffset);
}
@@ -276,10 +275,9 @@ static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
*/
static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
{
- u32 gpio = irq_to_gpio(d->irq);
- u32 gpio_idx = gpio & 0x1F;
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct mxc_gpio_port *port = gc->private;
+ u32 gpio_idx = d->hwirq;
if (enable) {
if (port->irq_high && (gpio_idx >= 16))
@@ -296,16 +294,13 @@ static int gpio_set_wake_irq(struct irq_data *d, u32 enable)
return 0;
}
-static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port)
+static void __devinit mxc_gpio_init_gc(struct irq_chip_generic *gc)
{
- struct irq_chip_generic *gc;
- struct irq_chip_type *ct;
+ struct irq_chip_type *ct = gc->chip_types;
+ struct mxc_gpio_port *port = gc->private;
- gc = irq_alloc_generic_chip("gpio-mxc", 1, port->virtual_irq_start,
- port->base, handle_level_irq);
- gc->private = port;
+ port->irq_gc = gc;
- ct = gc->chip_types;
ct->chip.irq_ack = irq_gc_ack_set_bit;
ct->chip.irq_mask = irq_gc_mask_clr_bit;
ct->chip.irq_unmask = irq_gc_mask_set_bit;
@@ -313,9 +308,6 @@ static void __init mxc_gpio_init_gc(struct mxc_gpio_port *port)
ct->chip.irq_set_wake = gpio_set_wake_irq;
ct->regs.ack = GPIO_ISR;
ct->regs.mask = GPIO_IMR;
-
- irq_setup_generic_chip(gc, IRQ_MSK(32), IRQ_GC_INIT_NESTED_LOCK,
- IRQ_NOREQUEST, 0);
}
static void __devinit mxc_gpio_get_hw(struct platform_device *pdev)
@@ -352,15 +344,14 @@ static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
struct mxc_gpio_port *port =
container_of(bgc, struct mxc_gpio_port, bgc);
- return port->virtual_irq_start + offset;
+ return irq_create_mapping(port->irq_gc->domain, offset);
}
static int __devinit mxc_gpio_probe(struct platform_device *pdev)
{
- struct device_node *np = pdev->dev.of_node;
struct mxc_gpio_port *port;
struct resource *iores;
- int err;
+ int err, irq_base;
mxc_gpio_get_hw(pdev);
@@ -430,15 +421,13 @@ static int __devinit mxc_gpio_probe(struct platform_device *pdev)
if (err)
goto out_bgpio_remove;
- /*
- * In dt case, we use gpio number range dynamically
- * allocated by gpio core.
- */
- port->virtual_irq_start = MXC_GPIO_IRQ_START + (np ? port->bgc.gc.base :
- pdev->id * 32);
-
/* gpio-mxc can be a generic irq chip */
- mxc_gpio_init_gc(port);
+ irq_base = pdev->dev.of_node ? -1 : irq_alloc_descs(-1, 0, 32, 0);
+ irq_setup_generic_chip_domain("gpio-mxc",
+ of_node_get(pdev->dev.of_node),
+ 1, irq_base, port->base, handle_level_irq,
+ 32, IRQ_GC_INIT_NESTED_LOCK,
+ IRQ_NOREQUEST, 0, mxc_gpio_init_gc, port);
list_add_tail(&port->node, &mxc_gpio_ports);
--
1.7.5.4
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