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gpio: pxa: parse gpio from DTS file

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Parse GPIO numbers from DTS file. Allocate interrupt according to
GPIO numbers.

Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Haojian Zhuang 2012-04-13 15:15:45 +08:00
parent c68ef2b592
commit 7a4d5079ba
1 changed files with 99 additions and 19 deletions
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118
drivers/gpio/gpio-pxa.c
View file

@ -11,13 +11,17 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio-pxa.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/syscore_ops.h>
#include <linux/slab.h>
@ -56,6 +60,10 @@
int pxa_last_gpio;
#ifdef CONFIG_OF
static struct irq_domain *domain;
#endif
struct pxa_gpio_chip {
struct gpio_chip chip;
void __iomem *regbase;
@ -81,7 +89,6 @@ enum {
PXA3XX_GPIO,
PXA93X_GPIO,
MMP_GPIO = 0x10,
MMP2_GPIO,
};
static DEFINE_SPINLOCK(gpio_lock);
@ -475,22 +482,92 @@ static int pxa_gpio_nums(void)
gpio_type = MMP_GPIO;
} else if (cpu_is_mmp2()) {
count = 191;
gpio_type = MMP2_GPIO;
gpio_type = MMP_GPIO;
}
#endif /* CONFIG_ARCH_MMP */
return count;
}
static struct of_device_id pxa_gpio_dt_ids[] = {
{ .compatible = "mrvl,pxa-gpio" },
{ .compatible = "mrvl,mmp-gpio", .data = (void *)MMP_GPIO },
{}
};
static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
return 0;
}
const struct irq_domain_ops pxa_irq_domain_ops = {
.map = pxa_irq_domain_map,
};
#ifdef CONFIG_OF
static int __devinit pxa_gpio_probe_dt(struct platform_device *pdev)
{
int ret, nr_banks, nr_gpios, irq_base;
struct device_node *prev, *next, *np = pdev->dev.of_node;
const struct of_device_id *of_id =
of_match_device(pxa_gpio_dt_ids, &pdev->dev);
if (!of_id) {
dev_err(&pdev->dev, "Failed to find gpio controller\n");
return -EFAULT;
}
gpio_type = (int)of_id->data;
next = of_get_next_child(np, NULL);
prev = next;
if (!next) {
dev_err(&pdev->dev, "Failed to find child gpio node\n");
ret = -EINVAL;
goto err;
}
for (nr_banks = 1; ; nr_banks++) {
next = of_get_next_child(np, prev);
if (!next)
break;
prev = next;
}
of_node_put(prev);
nr_gpios = nr_banks << 5;
pxa_last_gpio = nr_gpios - 1;
irq_base = irq_alloc_descs(-1, 0, nr_gpios, 0);
if (irq_base < 0) {
dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");
goto err;
}
domain = irq_domain_add_legacy(np, nr_gpios, irq_base, 0,
&pxa_irq_domain_ops, NULL);
return 0;
err:
iounmap(gpio_reg_base);
return ret;
}
#else
#define pxa_gpio_probe_dt(pdev) (-1)
#endif
static int __devinit pxa_gpio_probe(struct platform_device *pdev)
{
struct pxa_gpio_chip *c;
struct resource *res;
struct clk *clk;
struct pxa_gpio_platform_data *info;
int gpio, irq, ret;
int gpio, irq, ret, use_of = 0;
int irq0 = 0, irq1 = 0, irq_mux, gpio_offset = 0;
pxa_last_gpio = pxa_gpio_nums();
ret = pxa_gpio_probe_dt(pdev);
if (ret < 0)
pxa_last_gpio = pxa_gpio_nums();
else
use_of = 1;
if (!pxa_last_gpio)
return -EINVAL;
@ -545,25 +622,27 @@ static int __devinit pxa_gpio_probe(struct platform_device *pdev)
writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);
}
if (!use_of) {
#ifdef CONFIG_ARCH_PXA
irq = gpio_to_irq(0);
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
irq_set_chained_handler(IRQ_GPIO0, pxa_gpio_demux_handler);
irq = gpio_to_irq(1);
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
irq_set_chained_handler(IRQ_GPIO1, pxa_gpio_demux_handler);
#endif
for (irq = gpio_to_irq(gpio_offset);
irq <= gpio_to_irq(pxa_last_gpio); irq++) {
irq = gpio_to_irq(0);
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
irq_set_chained_handler(IRQ_GPIO0, pxa_gpio_demux_handler);
irq = gpio_to_irq(1);
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
irq_set_chained_handler(IRQ_GPIO1, pxa_gpio_demux_handler);
#endif
for (irq = gpio_to_irq(gpio_offset);
irq <= gpio_to_irq(pxa_last_gpio); irq++) {
irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
handle_edge_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
}
irq_set_chained_handler(irq_mux, pxa_gpio_demux_handler);
@ -574,6 +653,7 @@ static struct platform_driver pxa_gpio_driver = {
.probe = pxa_gpio_probe,
.driver = {
.name = "pxa-gpio",
.of_match_table = pxa_gpio_dt_ids,
},
};