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Merge branch irq/gpio-immutable into irq/irqchip-next

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* irq/gpio-immutable:
  : .
  : First try at preventing the GPIO subsystem from abusing irq_chip
  : data structures. The general idea is to have an irq_chip flag
  : to tell the GPIO subsystem that these structures are immutable,
  : and to convert drivers one by one.
  : .
  Documentation: Update the recommended pattern for GPIO irqchips
  gpio: Update TODO to mention immutable irq_chip structures
  pinctrl: amd: Make the irqchip immutable
  pinctrl: msmgpio: Make the irqchip immutable
  pinctrl: apple-gpio: Make the irqchip immutable
  gpio: pl061: Make the irqchip immutable
  gpio: tegra186: Make the irqchip immutable
  gpio: Add helpers to ease the transition towards immutable irq_chip
  gpio: Expose the gpiochip_irq_re[ql]res helpers
  gpio: Don't fiddle with irqchips marked as immutable

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2022-04-19 15:23:14 +01:00
commit 4bde53ab33
11 changed files with 293 additions and 90 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

175
Documentation/driver-api/gpio/driver.rst
View File

@ -417,30 +417,66 @@ struct gpio_irq_chip inside struct gpio_chip before adding the gpio_chip.
If you do this, the additional irq_chip will be set up by gpiolib at the
same time as setting up the rest of the GPIO functionality. The following
is a typical example of a chained cascaded interrupt handler using
the gpio_irq_chip:
the gpio_irq_chip. Note how the mask/unmask (or disable/enable) functions
call into the core gpiolib code:
.. code-block:: c
/* Typical state container with dynamic irqchip */
/* Typical state container */
struct my_gpio {
struct gpio_chip gc;
struct irq_chip irq;
};
static void my_gpio_mask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
/*
* Perform any necessary action to mask the interrupt,
* and then call into the core code to synchronise the
* state.
*/
gpiochip_disable_irq(gc, d->hwirq);
}
static void my_gpio_unmask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
gpiochip_enable_irq(gc, d->hwirq);
/*
* Perform any necessary action to unmask the interrupt,
* after having called into the core code to synchronise
* the state.
*/
}
/*
* Statically populate the irqchip. Note that it is made const
* (further indicated by the IRQCHIP_IMMUTABLE flag), and that
* the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
* callbacks to the structure.
*/
static const struct irq_chip my_gpio_irq_chip = {
.name = "my_gpio_irq",
.irq_ack = my_gpio_ack_irq,
.irq_mask = my_gpio_mask_irq,
.irq_unmask = my_gpio_unmask_irq,
.irq_set_type = my_gpio_set_irq_type,
.flags = IRQCHIP_IMMUTABLE,
/* Provide the gpio resource callbacks */
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
int irq; /* from platform etc */
struct my_gpio *g;
struct gpio_irq_chip *girq;
/* Set up the irqchip dynamically */
g->irq.name = "my_gpio_irq";
g->irq.irq_ack = my_gpio_ack_irq;
g->irq.irq_mask = my_gpio_mask_irq;
g->irq.irq_unmask = my_gpio_unmask_irq;
g->irq.irq_set_type = my_gpio_set_irq_type;
/* Get a pointer to the gpio_irq_chip */
girq = &g->gc.irq;
girq->chip = &g->irq;
gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
girq->parent_handler = ftgpio_gpio_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),
@ -458,23 +494,58 @@ the interrupt separately and go with it:
.. code-block:: c
/* Typical state container with dynamic irqchip */
/* Typical state container */
struct my_gpio {
struct gpio_chip gc;
struct irq_chip irq;
};
static void my_gpio_mask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
/*
* Perform any necessary action to mask the interrupt,
* and then call into the core code to synchronise the
* state.
*/
gpiochip_disable_irq(gc, d->hwirq);
}
static void my_gpio_unmask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
gpiochip_enable_irq(gc, d->hwirq);
/*
* Perform any necessary action to unmask the interrupt,
* after having called into the core code to synchronise
* the state.
*/
}
/*
* Statically populate the irqchip. Note that it is made const
* (further indicated by the IRQCHIP_IMMUTABLE flag), and that
* the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
* callbacks to the structure.
*/
static const struct irq_chip my_gpio_irq_chip = {
.name = "my_gpio_irq",
.irq_ack = my_gpio_ack_irq,
.irq_mask = my_gpio_mask_irq,
.irq_unmask = my_gpio_unmask_irq,
.irq_set_type = my_gpio_set_irq_type,
.flags = IRQCHIP_IMMUTABLE,
/* Provide the gpio resource callbacks */
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
int irq; /* from platform etc */
struct my_gpio *g;
struct gpio_irq_chip *girq;
/* Set up the irqchip dynamically */
g->irq.name = "my_gpio_irq";
g->irq.irq_ack = my_gpio_ack_irq;
g->irq.irq_mask = my_gpio_mask_irq;
g->irq.irq_unmask = my_gpio_unmask_irq;
g->irq.irq_set_type = my_gpio_set_irq_type;
ret = devm_request_threaded_irq(dev, irq, NULL,
irq_thread_fn, IRQF_ONESHOT, "my-chip", g);
if (ret < 0)
@ -482,7 +553,7 @@ the interrupt separately and go with it:
/* Get a pointer to the gpio_irq_chip */
girq = &g->gc.irq;
girq->chip = &g->irq;
gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;
@ -500,24 +571,61 @@ In this case the typical set-up will look like this:
/* Typical state container with dynamic irqchip */
struct my_gpio {
struct gpio_chip gc;
struct irq_chip irq;
struct fwnode_handle *fwnode;
};
int irq; /* from platform etc */
static void my_gpio_mask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
/*
* Perform any necessary action to mask the interrupt,
* and then call into the core code to synchronise the
* state.
*/
gpiochip_disable_irq(gc, d->hwirq);
irq_mask_mask_parent(d);
}
static void my_gpio_unmask_irq(struct irq_data *d)
{
struct gpio_chip *gc = irq_desc_get_handler_data(d);
gpiochip_enable_irq(gc, d->hwirq);
/*
* Perform any necessary action to unmask the interrupt,
* after having called into the core code to synchronise
* the state.
*/
irq_mask_unmask_parent(d);
}
/*
* Statically populate the irqchip. Note that it is made const
* (further indicated by the IRQCHIP_IMMUTABLE flag), and that
* the GPIOCHIP_IRQ_RESOURCE_HELPER macro adds some extra
* callbacks to the structure.
*/
static const struct irq_chip my_gpio_irq_chip = {
.name = "my_gpio_irq",
.irq_ack = my_gpio_ack_irq,
.irq_mask = my_gpio_mask_irq,
.irq_unmask = my_gpio_unmask_irq,
.irq_set_type = my_gpio_set_irq_type,
.flags = IRQCHIP_IMMUTABLE,
/* Provide the gpio resource callbacks */
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
struct my_gpio *g;
struct gpio_irq_chip *girq;
/* Set up the irqchip dynamically */
g->irq.name = "my_gpio_irq";
g->irq.irq_ack = my_gpio_ack_irq;
g->irq.irq_mask = my_gpio_mask_irq;
g->irq.irq_unmask = my_gpio_unmask_irq;
g->irq.irq_set_type = my_gpio_set_irq_type;
/* Get a pointer to the gpio_irq_chip */
girq = &g->gc.irq;
girq->chip = &g->irq;
gpio_irq_chip_set_chip(girq, &my_gpio_irq_chip);
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_bad_irq;
girq->fwnode = g->fwnode;
@ -605,8 +713,9 @@ When implementing an irqchip inside a GPIO driver, these two functions should
typically be called in the .irq_disable() and .irq_enable() callbacks from the
irqchip.
When using the gpiolib irqchip helpers, these callbacks are automatically
assigned.
When IRQCHIP_IMMUTABLE is not advertised by the irqchip, these callbacks
are automatically assigned. This behaviour is deprecated and on its way
to be removed from the kernel.
Real-Time compliance for GPIO IRQ chips

19
drivers/gpio/TODO
View File

@ -178,3 +178,22 @@ discussed but the idea is to provide a low-level access point
for debugging and hacking and to expose all lines without the
need of any exporting. Also provide ample ammunition to shoot
oneself in the foot, because this is debugfs after all.
Moving over to immutable irq_chip structures
Most of the gpio chips implementing interrupt support rely on gpiolib
intercepting some of the irq_chip callbacks, preventing the structures
from being made read-only and forcing duplication of structures that
should otherwise be unique.
The solution is to call into the gpiolib code when needed (resource
management, enable/disable or unmask/mask callbacks), and to let the
core code know about that by exposing a flag (IRQCHIP_IMMUTABLE) in
the irq_chip structure. The irq_chip structure can then be made unique
and const.
A small number of drivers have been converted (pl061, tegra186, msm,
amd, apple), and can be used as examples of how to proceed with this
conversion. Note that drivers using the generic irqchip framework
cannot be converted yet, but watch this space!

32
drivers/gpio/gpio-pl061.c
View File

@ -52,7 +52,6 @@ struct pl061 {
void __iomem *base;
struct gpio_chip gc;
struct irq_chip irq_chip;
int parent_irq;
#ifdef CONFIG_PM
@ -241,6 +240,8 @@ static void pl061_irq_mask(struct irq_data *d)
gpioie = readb(pl061->base + GPIOIE) & ~mask;
writeb(gpioie, pl061->base + GPIOIE);
raw_spin_unlock(&pl061->lock);
gpiochip_disable_irq(gc, d->hwirq);
}
static void pl061_irq_unmask(struct irq_data *d)
@ -250,6 +251,8 @@ static void pl061_irq_unmask(struct irq_data *d)
u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
u8 gpioie;
gpiochip_enable_irq(gc, d->hwirq);
raw_spin_lock(&pl061->lock);
gpioie = readb(pl061->base + GPIOIE) | mask;
writeb(gpioie, pl061->base + GPIOIE);
@ -283,6 +286,24 @@ static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
return irq_set_irq_wake(pl061->parent_irq, state);
}
static void pl061_irq_print_chip(struct irq_data *data, struct seq_file *p)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
seq_printf(p, dev_name(gc->parent));
}
static const struct irq_chip pl061_irq_chip = {
.irq_ack = pl061_irq_ack,
.irq_mask = pl061_irq_mask,
.irq_unmask = pl061_irq_unmask,
.irq_set_type = pl061_irq_type,
.irq_set_wake = pl061_irq_set_wake,
.irq_print_chip = pl061_irq_print_chip,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
{
struct device *dev = &adev->dev;
@ -315,13 +336,6 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
/*
* irq_chip support
*/
pl061->irq_chip.name = dev_name(dev);
pl061->irq_chip.irq_ack = pl061_irq_ack;
pl061->irq_chip.irq_mask = pl061_irq_mask;
pl061->irq_chip.irq_unmask = pl061_irq_unmask;
pl061->irq_chip.irq_set_type = pl061_irq_type;
pl061->irq_chip.irq_set_wake = pl061_irq_set_wake;
writeb(0, pl061->base + GPIOIE); /* disable irqs */
irq = adev->irq[0];
if (!irq)
@ -329,7 +343,7 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
pl061->parent_irq = irq;
girq = &pl061->gc.irq;
girq->chip = &pl061->irq_chip;
gpio_irq_chip_set_chip(girq, &pl061_irq_chip);
girq->parent_handler = pl061_irq_handler;
girq->num_parents = 1;
girq->parents = devm_kcalloc(dev, 1, sizeof(*girq->parents),

32
drivers/gpio/gpio-tegra186.c
View File

@ -80,7 +80,6 @@ struct tegra_gpio_soc {
struct tegra_gpio {
struct gpio_chip gpio;
struct irq_chip intc;
unsigned int num_irq;
unsigned int *irq;
@ -372,6 +371,8 @@ static void tegra186_irq_mask(struct irq_data *data)
value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
value &= ~TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
gpiochip_disable_irq(&gpio->gpio, data->hwirq);
}
static void tegra186_irq_unmask(struct irq_data *data)
@ -385,6 +386,8 @@ static void tegra186_irq_unmask(struct irq_data *data)
if (WARN_ON(base == NULL))
return;
gpiochip_enable_irq(&gpio->gpio, data->hwirq);
value = readl(base + TEGRA186_GPIO_ENABLE_CONFIG);
value |= TEGRA186_GPIO_ENABLE_CONFIG_INTERRUPT;
writel(value, base + TEGRA186_GPIO_ENABLE_CONFIG);
@ -456,6 +459,24 @@ static int tegra186_irq_set_wake(struct irq_data *data, unsigned int on)
return 0;
}
static void tegra186_irq_print_chip(struct irq_data *data, struct seq_file *p)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
seq_printf(p, dev_name(gc->parent));
}
static const struct irq_chip tegra186_gpio_irq_chip = {
.irq_ack = tegra186_irq_ack,
.irq_mask = tegra186_irq_mask,
.irq_unmask = tegra186_irq_unmask,
.irq_set_type = tegra186_irq_set_type,
.irq_set_wake = tegra186_irq_set_wake,
.irq_print_chip = tegra186_irq_print_chip,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
static void tegra186_gpio_irq(struct irq_desc *desc)
{
struct tegra_gpio *gpio = irq_desc_get_handler_data(desc);
@ -760,15 +781,8 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
gpio->gpio.of_xlate = tegra186_gpio_of_xlate;
#endif /* CONFIG_OF_GPIO */
gpio->intc.name = dev_name(&pdev->dev);
gpio->intc.irq_ack = tegra186_irq_ack;
gpio->intc.irq_mask = tegra186_irq_mask;
gpio->intc.irq_unmask = tegra186_irq_unmask;
gpio->intc.irq_set_type = tegra186_irq_set_type;
gpio->intc.irq_set_wake = tegra186_irq_set_wake;
irq = &gpio->gpio.irq;
irq->chip = &gpio->intc;
gpio_irq_chip_set_chip(irq, &tegra186_gpio_irq_chip);
irq->fwnode = of_node_to_fwnode(pdev->dev.of_node);
irq->child_to_parent_hwirq = tegra186_gpio_child_to_parent_hwirq;
irq->populate_parent_alloc_arg = tegra186_gpio_populate_parent_fwspec;

13
drivers/gpio/gpiolib.c
View File

@ -1433,19 +1433,21 @@ static int gpiochip_to_irq(struct gpio_chip *gc, unsigned int offset)
return irq_create_mapping(domain, offset);
}
static int gpiochip_irq_reqres(struct irq_data *d)
int gpiochip_irq_reqres(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
return gpiochip_reqres_irq(gc, d->hwirq);
}
EXPORT_SYMBOL(gpiochip_irq_reqres);
static void gpiochip_irq_relres(struct irq_data *d)
void gpiochip_irq_relres(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
gpiochip_relres_irq(gc, d->hwirq);
}
EXPORT_SYMBOL(gpiochip_irq_relres);
static void gpiochip_irq_mask(struct irq_data *d)
{
@ -1485,6 +1487,11 @@ static void gpiochip_set_irq_hooks(struct gpio_chip *gc)
{
struct irq_chip *irqchip = gc->irq.chip;
if (irqchip->flags & IRQCHIP_IMMUTABLE)
return;
chip_warn(gc, "not an immutable chip, please consider fixing it!\n");
if (!irqchip->irq_request_resources &&
!irqchip->irq_release_resources) {
irqchip->irq_request_resources = gpiochip_irq_reqres;
@ -1652,7 +1659,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc)
irq_domain_remove(gc->irq.domain);
}
if (irqchip) {
if (irqchip && !(irqchip->flags & IRQCHIP_IMMUTABLE)) {
if (irqchip->irq_request_resources == gpiochip_irq_reqres) {
irqchip->irq_request_resources = NULL;
irqchip->irq_release_resources = NULL;

11
drivers/pinctrl/pinctrl-amd.c
View File

@ -387,6 +387,8 @@ static void amd_gpio_irq_enable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct amd_gpio *gpio_dev = gpiochip_get_data(gc);
gpiochip_enable_irq(gc, d->hwirq);
raw_spin_lock_irqsave(&gpio_dev->lock, flags);
pin_reg = readl(gpio_dev->base + (d->hwirq)*4);
pin_reg |= BIT(INTERRUPT_ENABLE_OFF);
@ -408,6 +410,8 @@ static void amd_gpio_irq_disable(struct irq_data *d)
pin_reg &= ~BIT(INTERRUPT_MASK_OFF);
writel(pin_reg, gpio_dev->base + (d->hwirq)*4);
raw_spin_unlock_irqrestore(&gpio_dev->lock, flags);
gpiochip_disable_irq(gc, d->hwirq);
}
static void amd_gpio_irq_mask(struct irq_data *d)
@ -577,7 +581,7 @@ static void amd_irq_ack(struct irq_data *d)
*/
}
static struct irq_chip amd_gpio_irqchip = {
static const struct irq_chip amd_gpio_irqchip = {
.name = "amd_gpio",
.irq_ack = amd_irq_ack,
.irq_enable = amd_gpio_irq_enable,
@ -593,7 +597,8 @@ static struct irq_chip amd_gpio_irqchip = {
* the wake event. Otherwise the wake event will never clear and
* prevent the system from suspending.
*/
.flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND,
.flags = IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND | IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
#define PIN_IRQ_PENDING (BIT(INTERRUPT_STS_OFF) | BIT(WAKE_STS_OFF))
@ -1026,7 +1031,7 @@ static int amd_gpio_probe(struct platform_device *pdev)
amd_gpio_irq_init(gpio_dev);
girq = &gpio_dev->gc.irq;
girq->chip = &amd_gpio_irqchip;
gpio_irq_chip_set_chip(girq, &amd_gpio_irqchip);
/* This will let us handle the parent IRQ in the driver */
girq->parent_handler = NULL;
girq->num_parents = 0;

29
drivers/pinctrl/pinctrl-apple-gpio.c
View File

@ -36,7 +36,6 @@ struct apple_gpio_pinctrl {
struct pinctrl_desc pinctrl_desc;
struct gpio_chip gpio_chip;
struct irq_chip irq_chip;
u8 irqgrps[];
};
@ -275,17 +274,21 @@ static unsigned int apple_gpio_irq_type(unsigned int type)
static void apple_gpio_irq_mask(struct irq_data *data)
{
struct apple_gpio_pinctrl *pctl = gpiochip_get_data(irq_data_get_irq_chip_data(data));
struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
struct apple_gpio_pinctrl *pctl = gpiochip_get_data(gc);
apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE,
FIELD_PREP(REG_GPIOx_MODE, REG_GPIOx_IN_IRQ_OFF));
gpiochip_disable_irq(gc, data->hwirq);
}
static void apple_gpio_irq_unmask(struct irq_data *data)
{
struct apple_gpio_pinctrl *pctl = gpiochip_get_data(irq_data_get_irq_chip_data(data));
struct gpio_chip *gc = irq_data_get_irq_chip_data(data);
struct apple_gpio_pinctrl *pctl = gpiochip_get_data(gc);
unsigned int irqtype = apple_gpio_irq_type(irqd_get_trigger_type(data));
gpiochip_enable_irq(gc, data->hwirq);
apple_gpio_set_reg(pctl, data->hwirq, REG_GPIOx_MODE,
FIELD_PREP(REG_GPIOx_MODE, irqtype));
}
@ -343,13 +346,15 @@ static void apple_gpio_irq_handler(struct irq_desc *desc)
chained_irq_exit(chip, desc);
}
static struct irq_chip apple_gpio_irqchip = {
.name = "Apple-GPIO",
.irq_startup = apple_gpio_irq_startup,
.irq_ack = apple_gpio_irq_ack,
.irq_mask = apple_gpio_irq_mask,
.irq_unmask = apple_gpio_irq_unmask,
.irq_set_type = apple_gpio_irq_set_type,
static const struct irq_chip apple_gpio_irqchip = {
.name = "Apple-GPIO",
.irq_startup = apple_gpio_irq_startup,
.irq_ack = apple_gpio_irq_ack,
.irq_mask = apple_gpio_irq_mask,
.irq_unmask = apple_gpio_irq_unmask,
.irq_set_type = apple_gpio_irq_set_type,
.flags = IRQCHIP_IMMUTABLE,
GPIOCHIP_IRQ_RESOURCE_HELPERS,
};
/* Probe & register */
@ -360,8 +365,6 @@ static int apple_gpio_register(struct apple_gpio_pinctrl *pctl)
void **irq_data = NULL;
int ret;
pctl->irq_chip = apple_gpio_irqchip;
pctl->gpio_chip.label = dev_name(pctl->dev);
pctl->gpio_chip.request = gpiochip_generic_request;
pctl->gpio_chip.free = gpiochip_generic_free;
@ -377,7 +380,7 @@ static int apple_gpio_register(struct apple_gpio_pinctrl *pctl)
if (girq->num_parents) {
int i;
girq->chip = &pctl->irq_chip;
gpio_irq_chip_set_chip(girq, &apple_gpio_irqchip);
girq->parent_handler = apple_gpio_irq_handler;
girq->parents = kmalloc_array(girq->num_parents,

53
drivers/pinctrl/qcom/pinctrl-msm.c
View File

@ -42,7 +42,6 @@
* @chip: gpiochip handle.
* @desc: pin controller descriptor
* @restart_nb: restart notifier block.
* @irq_chip: irq chip information
* @irq: parent irq for the TLMM irq_chip.
* @intr_target_use_scm: route irq to application cpu using scm calls
* @lock: Spinlock to protect register resources as well
@ -63,7 +62,6 @@ struct msm_pinctrl {
struct pinctrl_desc desc;
struct notifier_block restart_nb;
struct irq_chip irq_chip;
int irq;
bool intr_target_use_scm;
@ -868,6 +866,8 @@ static void msm_gpio_irq_enable(struct irq_data *d)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
gpiochip_enable_irq(gc, d->hwirq);
if (d->parent_data)
irq_chip_enable_parent(d);
@ -885,6 +885,8 @@ static void msm_gpio_irq_disable(struct irq_data *d)
if (!test_bit(d->hwirq, pctrl->skip_wake_irqs))
msm_gpio_irq_mask(d);
gpiochip_disable_irq(gc, d->hwirq);
}
/**
@ -958,6 +960,14 @@ static void msm_gpio_irq_ack(struct irq_data *d)
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
}
static void msm_gpio_irq_eoi(struct irq_data *d)
{
d = d->parent_data;
if (d)
d->chip->irq_eoi(d);
}
static bool msm_gpio_needs_dual_edge_parent_workaround(struct irq_data *d,
unsigned int type)
{
@ -1255,6 +1265,26 @@ static bool msm_gpio_needs_valid_mask(struct msm_pinctrl *pctrl)
return device_property_count_u16(pctrl->dev, "gpios") > 0;
}
static const struct irq_chip msm_gpio_irq_chip = {
.name = "msmgpio",
.irq_enable = msm_gpio_irq_enable,
.irq_disable = msm_gpio_irq_disable,
.irq_mask = msm_gpio_irq_mask,
.irq_unmask = msm_gpio_irq_unmask,
.irq_ack = msm_gpio_irq_ack,
.irq_eoi = msm_gpio_irq_eoi,
.irq_set_type = msm_gpio_irq_set_type,
.irq_set_wake = msm_gpio_irq_set_wake,
.irq_request_resources = msm_gpio_irq_reqres,
.irq_release_resources = msm_gpio_irq_relres,
.irq_set_affinity = msm_gpio_irq_set_affinity,
.irq_set_vcpu_affinity = msm_gpio_irq_set_vcpu_affinity,
.flags = (IRQCHIP_MASK_ON_SUSPEND |
IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND |
IRQCHIP_IMMUTABLE),
};
static int msm_gpio_init(struct msm_pinctrl *pctrl)
{
struct gpio_chip *chip;
@ -1276,22 +1306,6 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
if (msm_gpio_needs_valid_mask(pctrl))
chip->init_valid_mask = msm_gpio_init_valid_mask;
pctrl->irq_chip.name = "msmgpio";
pctrl->irq_chip.irq_enable = msm_gpio_irq_enable;
pctrl->irq_chip.irq_disable = msm_gpio_irq_disable;
pctrl->irq_chip.irq_mask = msm_gpio_irq_mask;
pctrl->irq_chip.irq_unmask = msm_gpio_irq_unmask;
pctrl->irq_chip.irq_ack = msm_gpio_irq_ack;
pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type;
pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake;
pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres;
pctrl->irq_chip.irq_release_resources = msm_gpio_irq_relres;
pctrl->irq_chip.irq_set_affinity = msm_gpio_irq_set_affinity;
pctrl->irq_chip.irq_set_vcpu_affinity = msm_gpio_irq_set_vcpu_affinity;
pctrl->irq_chip.flags = IRQCHIP_MASK_ON_SUSPEND |
IRQCHIP_SET_TYPE_MASKED |
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND;
np = of_parse_phandle(pctrl->dev->of_node, "wakeup-parent", 0);
if (np) {
chip->irq.parent_domain = irq_find_matching_host(np,
@ -1300,7 +1314,6 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
if (!chip->irq.parent_domain)
return -EPROBE_DEFER;
chip->irq.child_to_parent_hwirq = msm_gpio_wakeirq;
pctrl->irq_chip.irq_eoi = irq_chip_eoi_parent;
/*
* Let's skip handling the GPIOs, if the parent irqchip
* is handling the direct connect IRQ of the GPIO.
@ -1313,7 +1326,7 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
}
girq = &chip->irq;
girq->chip = &pctrl->irq_chip;
gpio_irq_chip_set_chip(girq, &msm_gpio_irq_chip);
girq->parent_handler = msm_gpio_irq_handler;
girq->fwnode = pctrl->dev->fwnode;
girq->num_parents = 1;

16
include/linux/gpio/driver.h
View File

@ -588,6 +588,22 @@ void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset);
void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
/* irq_data versions of the above */
int gpiochip_irq_reqres(struct irq_data *data);
void gpiochip_irq_relres(struct irq_data *data);
/* Paste this in your irq_chip structure */
#define GPIOCHIP_IRQ_RESOURCE_HELPERS \
.irq_request_resources = gpiochip_irq_reqres, \
.irq_release_resources = gpiochip_irq_relres
static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
const struct irq_chip *chip)
{
/* Yes, dropping const is ugly, but it isn't like we have a choice */
girq->chip = (struct irq_chip *)chip;
}
/* Line status inquiry for drivers */
bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);

2
include/linux/irq.h
View File

@ -569,6 +569,7 @@ struct irq_chip {
* IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND: Invokes __enable_irq()/__disable_irq() for wake irqs
* in the suspend path if they are in disabled state
* IRQCHIP_AFFINITY_PRE_STARTUP: Default affinity update before startup
* IRQCHIP_IMMUTABLE: Don't ever change anything in this chip
*/
enum {
IRQCHIP_SET_TYPE_MASKED = (1 << 0),
@ -582,6 +583,7 @@ enum {
IRQCHIP_SUPPORTS_NMI = (1 << 8),
IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND = (1 << 9),
IRQCHIP_AFFINITY_PRE_STARTUP = (1 << 10),
IRQCHIP_IMMUTABLE = (1 << 11),
};
#include <linux/irqdesc.h>

1
kernel/irq/debugfs.c
View File

@ -58,6 +58,7 @@ static const struct irq_bit_descr irqchip_flags[] = {
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_LEVEL_MSI),
BIT_MASK_DESCR(IRQCHIP_SUPPORTS_NMI),
BIT_MASK_DESCR(IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND),
BIT_MASK_DESCR(IRQCHIP_IMMUTABLE),
};
static void