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Subject[PATCH v2] pinctrl: st: use gpiolib irqchip helpers
Date
From: Linus Walleij <linus.walleij@linaro.org>

This lets the gpiolib core handle the irqchip set-up and
chained IRQ on the primary (behind the mux) IRQ chip in
the st pinctrl driver.

Default irq type is set to level low at irqchip add time.

Cc: Srinivas Kandagatla <srinivas.kandagatla@gmail.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Maxime COQUELIN <maxime.coquelin@st.com>
---

The v1 was sent by Linus (https://lkml.org/lkml/2014/4/4/287).
Two changes were necessary to make it to work properly on STiH416:
1 - dev reference was not passed to the gpio_chip struct, causing a panic
2 - gpiochip_irqchip_add passed IRQ_TYPE_NONE as default type, which caused
lot of warnings at init time. I choose IRQ_TYPE_LEVEL_LOW as default.

This patches is based on top of pinctrl's devel branch.
Its testing require a merge of pinctrl and gpio devel branches, plus the DT
patch adding interrupt support to pinctrl on STiH416.

Thanks,
Maxime

drivers/pinctrl/Kconfig | 1 +
drivers/pinctrl/pinctrl-st.c | 100 ++++++++-----------------------------------
2 files changed, 20 insertions(+), 81 deletions(-)

diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 32b6b49..ca20ded 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -278,6 +278,7 @@ config PINCTRL_ST
depends on OF
select PINMUX
select PINCONF
+ select GPIOLIB_IRQCHIP

config PINCTRL_TEGRA
bool
diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 639af4a..987099c 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -13,10 +13,6 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdesc.h>
-#include <linux/irqdomain.h>
-#include <linux/irqchip/chained_irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
@@ -321,7 +317,6 @@ struct st_gpio_bank {
struct pinctrl_gpio_range range;
void __iomem *base;
struct st_pio_control pc;
- struct irq_domain *domain;
unsigned long irq_edge_conf;
spinlock_t lock;
};
@@ -1285,56 +1280,26 @@ static int st_pctl_parse_functions(struct device_node *np,
return 0;
}

-static int st_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
-{
- struct st_gpio_bank *bank = gpio_chip_to_bank(chip);
- int irq = -ENXIO;
-
- if (offset < chip->ngpio)
- irq = irq_find_mapping(bank->domain, offset);
-
- dev_info(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
- chip->label, offset + chip->base, irq);
- return irq;
-}
-
static void st_gpio_irq_mask(struct irq_data *d)
{
- struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct st_gpio_bank *bank = gpio_chip_to_bank(gc);

writel(BIT(d->hwirq), bank->base + REG_PIO_CLR_PMASK);
}

static void st_gpio_irq_unmask(struct irq_data *d)
{
- struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct st_gpio_bank *bank = gpio_chip_to_bank(gc);

writel(BIT(d->hwirq), bank->base + REG_PIO_SET_PMASK);
}

-static int st_gpio_irq_reqres(struct irq_data *d)
-{
- struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
-
- if (gpio_lock_as_irq(&bank->gpio_chip, d->hwirq)) {
- dev_err(bank->gpio_chip.dev,
- "unable to lock HW IRQ %lu for IRQ\n",
- d->hwirq);
- return -EINVAL;
- }
- return 0;
-}
-
-static void st_gpio_irq_relres(struct irq_data *d)
-{
- struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
-
- gpio_unlock_as_irq(&bank->gpio_chip, d->hwirq);
-}
-
static int st_gpio_irq_set_type(struct irq_data *d, unsigned type)
{
- struct st_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct st_gpio_bank *bank = gpio_chip_to_bank(gc);
unsigned long flags;
int comp, pin = d->hwirq;
u32 val;
@@ -1438,7 +1403,7 @@ static void __gpio_irq_handler(struct st_gpio_bank *bank)
continue;
}

- generic_handle_irq(irq_find_mapping(bank->domain, n));
+ generic_handle_irq(irq_find_mapping(bank->gpio_chip.irqdomain, n));
}
}
}
@@ -1447,7 +1412,8 @@ static void st_gpio_irq_handler(unsigned irq, struct irq_desc *desc)
{
/* interrupt dedicated per bank */
struct irq_chip *chip = irq_get_chip(irq);
- struct st_gpio_bank *bank = irq_get_handler_data(irq);
+ struct gpio_chip *gc = irq_desc_get_handler_data(desc);
+ struct st_gpio_bank *bank = gpio_chip_to_bank(gc);

chained_irq_enter(chip, desc);
__gpio_irq_handler(bank);
@@ -1481,7 +1447,6 @@ static struct gpio_chip st_gpio_template = {
.ngpio = ST_GPIO_PINS_PER_BANK,
.of_gpio_n_cells = 1,
.of_xlate = st_gpio_xlate,
- .to_irq = st_gpio_to_irq,
};

static struct irq_chip st_gpio_irqchip = {
@@ -1489,26 +1454,6 @@ static struct irq_chip st_gpio_irqchip = {
.irq_mask = st_gpio_irq_mask,
.irq_unmask = st_gpio_irq_unmask,
.irq_set_type = st_gpio_irq_set_type,
- .irq_request_resources = st_gpio_irq_reqres,
- .irq_release_resources = st_gpio_irq_relres,
-};
-
-static int st_gpio_irq_domain_map(struct irq_domain *h,
- unsigned int virq, irq_hw_number_t hw)
-{
- struct st_gpio_bank *bank = h->host_data;
-
- irq_set_chip(virq, &st_gpio_irqchip);
- irq_set_handler(virq, handle_simple_irq);
- set_irq_flags(virq, IRQF_VALID);
- irq_set_chip_data(virq, bank);
-
- return 0;
-}
-
-static struct irq_domain_ops st_gpio_irq_ops = {
- .map = st_gpio_irq_domain_map,
- .xlate = irq_domain_xlate_twocell,
};

static int st_gpiolib_register_bank(struct st_pinctrl *info,
@@ -1519,7 +1464,7 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
struct device *dev = info->dev;
int bank_num = of_alias_get_id(np, "gpio");
struct resource res, irq_res;
- int gpio_irq = 0, err, i;
+ int gpio_irq = 0, err;

if (of_address_to_resource(np, 0, &res))
return -ENODEV;
@@ -1532,6 +1477,7 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,
bank->gpio_chip.base = bank_num * ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.ngpio = ST_GPIO_PINS_PER_BANK;
bank->gpio_chip.of_node = np;
+ bank->gpio_chip.dev = dev;
spin_lock_init(&bank->lock);

of_property_read_string(np, "st,bank-name", &range->name);
@@ -1569,26 +1515,18 @@ static int st_gpiolib_register_bank(struct st_pinctrl *info,

if (of_irq_to_resource(np, 0, &irq_res)) {
gpio_irq = irq_res.start;
- irq_set_chained_handler(gpio_irq, st_gpio_irq_handler);
- irq_set_handler_data(gpio_irq, bank);
+ gpiochip_set_chained_irqchip(&bank->gpio_chip, &st_gpio_irqchip,
+ gpio_irq, st_gpio_irq_handler);
}

if (info->irqmux_base > 0 || gpio_irq > 0) {
- /* Setup IRQ domain */
- bank->domain = irq_domain_add_linear(np,
- ST_GPIO_PINS_PER_BANK,
- &st_gpio_irq_ops, bank);
- if (!bank->domain) {
- dev_err(dev, "Failed to add irq domain for %s\n",
- np->full_name);
- } else {
- for (i = 0; i < ST_GPIO_PINS_PER_BANK; i++) {
- if (irq_create_mapping(bank->domain, i) < 0)
- dev_err(dev,
- "Failed to map IRQ %i\n", i);
- }
+ err = gpiochip_irqchip_add(&bank->gpio_chip, &st_gpio_irqchip,
+ 0, handle_simple_irq,
+ IRQ_TYPE_LEVEL_LOW);
+ if (err) {
+ dev_info(dev, "could not add irqchip\n");
+ return err;
}
-
} else {
dev_info(dev, "No IRQ support for %s bank\n", np->full_name);
}
--
1.9.0


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