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gpio: davinci: convert to use irqdomain support.

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Convert the davinci gpio driver to use irqdomain support.

Signed-off-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
[grygorii.strashko@ti.com:
 - switch to use one irq-domain per  all GPIO banks
 - keep irq_create_mapping() call in gpio_to_irq_banked() as it
   simply transformed to irq_find_mapping() if IRQ mapping exist
   already]
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
This commit is contained in:
Lad, Prabhakar 2013-11-21 23:45:27 +05:30 committed by Sekhar Nori
parent ee89cf63a1
commit 9211ff3140
2 changed files with 48 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
drivers/gpio/gpio-davinci.c
View File

@ -16,6 +16,7 @@
#include <linux/err.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/platform_device.h>
#include <linux/platform_data/gpio-davinci.h>
@ -282,8 +283,7 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
desc->irq_data.chip->irq_ack(&desc->irq_data);
while (1) {
u32 status;
int n;
int res;
int bit;
/* ack any irqs */
status = readl_relaxed(&g->intstat) & mask;
@ -292,17 +292,13 @@ gpio_irq_handler(unsigned irq, struct irq_desc *desc)
writel_relaxed(status, &g->intstat);
/* now demux them to the right lowlevel handler */
n = d->irq_base;
if (irq & 1) {
n += 16;
status >>= 16;
}
while (status) {
res = ffs(status);
n += res;
generic_handle_irq(n - 1);
status >>= res;
bit = __ffs(status);
status &= ~BIT(bit);
generic_handle_irq(
irq_find_mapping(d->irq_domain,
d->chip.base + bit));
}
}
desc->irq_data.chip->irq_unmask(&desc->irq_data);
@ -313,10 +309,7 @@ static int gpio_to_irq_banked(struct gpio_chip *chip, unsigned offset)
{
struct davinci_gpio_controller *d = chip2controller(chip);
if (d->irq_base >= 0)
return d->irq_base + offset;
else
return -ENODEV;
return irq_create_mapping(d->irq_domain, d->chip.base + offset);
}
static int gpio_to_irq_unbanked(struct gpio_chip *chip, unsigned offset)
@ -354,6 +347,27 @@ static int gpio_irq_type_unbanked(struct irq_data *data, unsigned trigger)
return 0;
}
static int
davinci_gpio_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hw)
{
struct davinci_gpio_regs __iomem *g = gpio2regs(hw);
irq_set_chip_and_handler_name(irq, &gpio_irqchip, handle_simple_irq,
"davinci_gpio");
irq_set_irq_type(irq, IRQ_TYPE_NONE);
irq_set_chip_data(irq, (__force void *)g);
irq_set_handler_data(irq, (void *)__gpio_mask(hw));
set_irq_flags(irq, IRQF_VALID);
return 0;
}
static const struct irq_domain_ops davinci_gpio_irq_ops = {
.map = davinci_gpio_irq_map,
.xlate = irq_domain_xlate_onetwocell,
};
/*
* NOTE: for suspend/resume, probably best to make a platform_device with
* suspend_late/resume_resume calls hooking into results of the set_wake()
@ -373,6 +387,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
struct davinci_gpio_controller *chips = platform_get_drvdata(pdev);
struct davinci_gpio_platform_data *pdata = dev->platform_data;
struct davinci_gpio_regs __iomem *g;
struct irq_domain *irq_domain;
ngpio = pdata->ngpio;
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
@ -396,6 +411,20 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
}
clk_prepare_enable(clk);
irq = irq_alloc_descs(-1, 0, ngpio, 0);
if (irq < 0) {
dev_err(dev, "Couldn't allocate IRQ numbers\n");
return irq;
}
irq_domain = irq_domain_add_legacy(NULL, ngpio, irq, 0,
&davinci_gpio_irq_ops,
chips);
if (!irq_domain) {
dev_err(dev, "Couldn't register an IRQ domain\n");
return -ENODEV;
}
/*
* Arrange gpio_to_irq() support, handling either direct IRQs or
* banked IRQs. Having GPIOs in the first GPIO bank use direct
@ -404,9 +433,8 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
*/
for (gpio = 0, bank = 0; gpio < ngpio; bank++, gpio += 32) {
chips[bank].chip.to_irq = gpio_to_irq_banked;
chips[bank].irq_base = pdata->gpio_unbanked
? -EINVAL
: (pdata->intc_irq_num + gpio);
if (!pdata->gpio_unbanked)
chips[bank].irq_domain = irq_domain;
}
/*
@ -449,11 +477,7 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
* Or, AINTC can handle IRQs for banks of 16 GPIO IRQs, which we
* then chain through our own handler.
*/
for (gpio = 0, irq = gpio_to_irq(0), bank = 0;
gpio < ngpio;
bank++, bank_irq++) {
unsigned i;
for (gpio = 0, bank = 0; gpio < ngpio; bank++, bank_irq++, gpio += 16) {
/* disabled by default, enabled only as needed */
g = gpio2regs(gpio);
writel_relaxed(~0, &g->clr_falling);
@ -469,14 +493,6 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
*/
irq_set_handler_data(bank_irq, &chips[gpio / 32]);
for (i = 0; i < 16 && gpio < ngpio; i++, irq++, gpio++) {
irq_set_chip(irq, &gpio_irqchip);
irq_set_chip_data(irq, (__force void *)g);
irq_set_handler_data(irq, (void *)__gpio_mask(gpio));
irq_set_handler(irq, handle_simple_irq);
set_irq_flags(irq, IRQF_VALID);
}
binten |= BIT(bank);
}
@ -487,8 +503,6 @@ done:
*/
writel_relaxed(binten, gpio_base + BINTEN);
printk(KERN_INFO "DaVinci: %d gpio irqs\n", irq - gpio_to_irq(0));
return 0;
}

2
include/linux/platform_data/gpio-davinci.h
View File

@ -34,7 +34,7 @@ struct davinci_gpio_platform_data {
struct davinci_gpio_controller {
struct gpio_chip chip;
int irq_base;
struct irq_domain *irq_domain;
/* Serialize access to GPIO registers */
spinlock_t lock;
void __iomem *regs;