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pinctrl: bcm2835: Add support for wake-up interrupts

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Leverage the IRQCHIP_MASK_ON_SUSPEND flag in order to avoid having to
specifically treat the GPIO interrupts during suspend and resume, and
simply implement an irq_set_wake() callback that is responsible for
enabling the parent wake-up interrupt as a wake-up interrupt.

To avoid allocating unnecessary resources for other chips, the wake-up
interrupts are only initialized if we have a brcm,bcm7211-gpio
compatibility string.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20200531001101.24945-5-f.fainelli@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Florian Fainelli 2020-05-30 17:11:01 -07:00 committed by Linus Walleij
parent 562c856f96
commit 920fecc1aa
1 changed files with 75 additions and 1 deletions
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76
drivers/pinctrl/bcm/pinctrl-bcm2835.c
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@ -19,6 +19,7 @@
#include <linux/irq.h>
#include <linux/irqdesc.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/of_address.h>
#include <linux/of.h>
#include <linux/of_irq.h>
@ -76,6 +77,7 @@
struct bcm2835_pinctrl {
struct device *dev;
void __iomem *base;
int *wake_irq;
/* note: locking assumes each bank will have its own unsigned long */
unsigned long enabled_irq_map[BCM2835_NUM_BANKS];
@ -435,6 +437,11 @@ static void bcm2835_gpio_irq_handler(struct irq_desc *desc)
chained_irq_exit(host_chip, desc);
}
static irqreturn_t bcm2835_gpio_wake_irq_handler(int irq, void *dev_id)
{
return IRQ_HANDLED;
}
static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc,
unsigned reg, unsigned offset, bool enable)
{
@ -634,6 +641,34 @@ static void bcm2835_gpio_irq_ack(struct irq_data *data)
bcm2835_gpio_set_bit(pc, GPEDS0, gpio);
}
static int bcm2835_gpio_irq_set_wake(struct irq_data *data, unsigned int on)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(data);
struct bcm2835_pinctrl *pc = gpiochip_get_data(chip);
unsigned gpio = irqd_to_hwirq(data);
unsigned int irqgroup;
int ret = -EINVAL;
if (!pc->wake_irq)
return ret;
if (gpio <= 27)
irqgroup = 0;
else if (gpio >= 28 && gpio <= 45)
irqgroup = 1;
else if (gpio >= 46 && gpio <= 57)
irqgroup = 2;
else
return ret;
if (on)
ret = enable_irq_wake(pc->wake_irq[irqgroup]);
else
ret = disable_irq_wake(pc->wake_irq[irqgroup]);
return ret;
}
static struct irq_chip bcm2835_gpio_irq_chip = {
.name = MODULE_NAME,
.irq_enable = bcm2835_gpio_irq_enable,
@ -642,6 +677,8 @@ static struct irq_chip bcm2835_gpio_irq_chip = {
.irq_ack = bcm2835_gpio_irq_ack,
.irq_mask = bcm2835_gpio_irq_disable,
.irq_unmask = bcm2835_gpio_irq_enable,
.irq_set_wake = bcm2835_gpio_irq_set_wake,
.flags = IRQCHIP_MASK_ON_SUSPEND,
};
static int bcm2835_pctl_get_groups_count(struct pinctrl_dev *pctldev)
@ -1154,6 +1191,7 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
struct resource iomem;
int err, i;
const struct of_device_id *match;
int is_7211 = 0;
BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_pins) != BCM2711_NUM_GPIOS);
BUILD_BUG_ON(ARRAY_SIZE(bcm2835_gpio_groups) != BCM2711_NUM_GPIOS);
@ -1180,6 +1218,7 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
return -EINVAL;
pdata = match->data;
is_7211 = of_device_is_compatible(np, "brcm,bcm7211-gpio");
pc->gpio_chip = *pdata->gpio_chip;
pc->gpio_chip.parent = dev;
@ -1214,6 +1253,15 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
GFP_KERNEL);
if (!girq->parents)
return -ENOMEM;
if (is_7211) {
pc->wake_irq = devm_kcalloc(dev, BCM2835_NUM_IRQS,
sizeof(*pc->wake_irq),
GFP_KERNEL);
if (!pc->wake_irq)
return -ENOMEM;
}
/*
* Use the same handler for all groups: this is necessary
* since we use one gpiochip to cover all lines - the
@ -1221,8 +1269,34 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev)
* bank that was firing the IRQ and look up the per-group
* and bank data.
*/
for (i = 0; i < BCM2835_NUM_IRQS; i++)
for (i = 0; i < BCM2835_NUM_IRQS; i++) {
int len;
char *name;
girq->parents[i] = irq_of_parse_and_map(np, i);
if (!is_7211)
continue;
/* Skip over the all banks interrupts */
pc->wake_irq[i] = irq_of_parse_and_map(np, i +
BCM2835_NUM_IRQS + 1);
len = strlen(dev_name(pc->dev)) + 16;
name = devm_kzalloc(pc->dev, len, GFP_KERNEL);
if (!name)
return -ENOMEM;
snprintf(name, len, "%s:bank%d", dev_name(pc->dev), i);
/* These are optional interrupts */
err = devm_request_irq(dev, pc->wake_irq[i],
bcm2835_gpio_wake_irq_handler,
IRQF_SHARED, name, pc);
if (err)
dev_warn(dev, "unable to request wake IRQ %d\n",
pc->wake_irq[i]);
}
girq->default_type = IRQ_TYPE_NONE;
girq->handler = handle_level_irq;