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pinctrl: intel: Add support for multiple GPIO chips sharing the interrupt 

On Intel Broxton the GPIO hardware consists of several chips that all share
the parent interrupt. It is not possible to handle this by setting chained
handler for each chip (as they will overwrite each other).

To overcome this we need to request the interrupt using devm_request_irq()
and pass IRQF_SHARED with the flags.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Mika Westerberg 2015-10-21 13:08:43 +03:00 committed by Linus Walleij
parent ef0eebc051
commit 193b40c825
1 changed files with 37 additions and 15 deletions
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52
drivers/pinctrl/intel/pinctrl-intel.c
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@ -12,6 +12,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/acpi.h> #include <linux/acpi.h>
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/gpio/driver.h> #include <linux/gpio/driver.h>
@ -803,9 +804,11 @@ static int intel_gpio_irq_wake(struct irq_data *d, unsigned int on)
return 0; return 0;
} }
static void intel_gpio_community_irq_handler(struct gpio_chip *gc, static irqreturn_t intel_gpio_community_irq_handler(struct intel_pinctrl *pctrl,
const struct intel_community *community) const struct intel_community *community)
{ {
struct gpio_chip *gc = &pctrl->chip;
irqreturn_t ret = IRQ_NONE;
int gpp; int gpp;
for (gpp = 0; gpp < community->ngpps; gpp++) { for (gpp = 0; gpp < community->ngpps; gpp++) {
@ -832,24 +835,28 @@ static void intel_gpio_community_irq_handler(struct gpio_chip *gc,
irq = irq_find_mapping(gc->irqdomain, irq = irq_find_mapping(gc->irqdomain,
community->pin_base + padno); community->pin_base + padno);
generic_handle_irq(irq); generic_handle_irq(irq);
ret |= IRQ_HANDLED;
} }
} }
return ret;
} }
static void intel_gpio_irq_handler(struct irq_desc *desc) static irqreturn_t intel_gpio_irq(int irq, void *data)
{ {
struct gpio_chip *gc = irq_desc_get_handler_data(desc); const struct intel_community *community;
struct intel_pinctrl *pctrl = gpiochip_to_pinctrl(gc); struct intel_pinctrl *pctrl = data;
struct irq_chip *chip = irq_desc_get_chip(desc); irqreturn_t ret = IRQ_NONE;
int i; int i;
chained_irq_enter(chip, desc);
/* Need to check all communities for pending interrupts */ /* Need to check all communities for pending interrupts */
for (i = 0; i < pctrl->ncommunities; i++) for (i = 0; i < pctrl->ncommunities; i++) {
intel_gpio_community_irq_handler(gc, &pctrl->communities[i]); community = &pctrl->communities[i];
ret |= intel_gpio_community_irq_handler(pctrl, community);
}
chained_irq_exit(chip, desc); return ret;
} }
static struct irq_chip intel_gpio_irqchip = { static struct irq_chip intel_gpio_irqchip = {
@ -882,21 +889,36 @@ static int intel_gpio_probe(struct intel_pinctrl *pctrl, int irq)
0, 0, pctrl->soc->npins); 0, 0, pctrl->soc->npins);
if (ret) { if (ret) {
dev_err(pctrl->dev, "failed to add GPIO pin range\n"); dev_err(pctrl->dev, "failed to add GPIO pin range\n");
gpiochip_remove(&pctrl->chip); goto fail;
return ret; }
/*
* We need to request the interrupt here (instead of providing chip
* to the irq directly) because on some platforms several GPIO
* controllers share the same interrupt line.
*/
ret = devm_request_irq(pctrl->dev, irq, intel_gpio_irq, IRQF_SHARED,
dev_name(pctrl->dev), pctrl);
if (ret) {
dev_err(pctrl->dev, "failed to request interrupt\n");
goto fail;
} }
ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0, ret = gpiochip_irqchip_add(&pctrl->chip, &intel_gpio_irqchip, 0,
handle_simple_irq, IRQ_TYPE_NONE); handle_simple_irq, IRQ_TYPE_NONE);
if (ret) { if (ret) {
dev_err(pctrl->dev, "failed to add irqchip\n"); dev_err(pctrl->dev, "failed to add irqchip\n");
gpiochip_remove(&pctrl->chip); goto fail;
return ret;
} }
gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq, gpiochip_set_chained_irqchip(&pctrl->chip, &intel_gpio_irqchip, irq,
intel_gpio_irq_handler); NULL);
return 0; return 0;
fail:
gpiochip_remove(&pctrl->chip);
return ret;
} }
static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl) static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)