From: Phil Elwell <[email protected]> Contrary to the documentation, the BCM2835 GPIO controller actually has four interrupt lines - one each for the three IRQ groups and one common. Confusingly, the GPIO interrupt groups don't correspond directly with the GPIO control banks. Instead, GPIOs 0-27 generate IRQ GPIO0, 28-45 IRQ GPIO1 and 46-53 IRQ GPIO2.
Awkwardly, the GPIOs for IRQ GPIO1 straddle two 32-entry GPIO banks, so split out a function to process the interrupts for a single GPIO bank. Cc: Stefan Wahren <[email protected]> Cc: Eric Anholt <[email protected]> Cc: Stephen Warren <[email protected]> Signed-off-by: Phil Elwell <[email protected]> Signed-off-by: Linus Walleij <[email protected]> --- I want to apply this to cater for my GPIOLIB_IRQCHIP refactorings. --- drivers/pinctrl/bcm/pinctrl-bcm2835.c | 51 ++++++++++++++++++++++++++--------- 1 file changed, 39 insertions(+), 12 deletions(-) diff --git a/drivers/pinctrl/bcm/pinctrl-bcm2835.c b/drivers/pinctrl/bcm/pinctrl-bcm2835.c index b2dd278f18b1..1d8fc104e26b 100644 --- a/drivers/pinctrl/bcm/pinctrl-bcm2835.c +++ b/drivers/pinctrl/bcm/pinctrl-bcm2835.c @@ -47,6 +47,7 @@ #define MODULE_NAME "pinctrl-bcm2835" #define BCM2835_NUM_GPIOS 54 #define BCM2835_NUM_BANKS 2 +#define BCM2835_NUM_IRQS 3 #define BCM2835_PIN_BITMAP_SZ \ DIV_ROUND_UP(BCM2835_NUM_GPIOS, sizeof(unsigned long) * 8) @@ -88,13 +89,13 @@ enum bcm2835_pinconf_pull { struct bcm2835_gpio_irqdata { struct bcm2835_pinctrl *pc; - int bank; + int irqgroup; }; struct bcm2835_pinctrl { struct device *dev; void __iomem *base; - int irq[BCM2835_NUM_BANKS]; + int irq[BCM2835_NUM_IRQS]; /* note: locking assumes each bank will have its own unsigned long */ unsigned long enabled_irq_map[BCM2835_NUM_BANKS]; @@ -105,7 +106,7 @@ struct bcm2835_pinctrl { struct gpio_chip gpio_chip; struct pinctrl_gpio_range gpio_range; - struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_BANKS]; + struct bcm2835_gpio_irqdata irq_data[BCM2835_NUM_IRQS]; spinlock_t irq_lock[BCM2835_NUM_BANKS]; }; @@ -391,17 +392,16 @@ static struct gpio_chip bcm2835_gpio_chip = { .can_sleep = false, }; -static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id) +static int bcm2835_gpio_irq_handle_bank(struct bcm2835_pinctrl *pc, + unsigned int bank, u32 mask) { - struct bcm2835_gpio_irqdata *irqdata = dev_id; - struct bcm2835_pinctrl *pc = irqdata->pc; - int bank = irqdata->bank; unsigned long events; unsigned offset; unsigned gpio; unsigned int type; events = bcm2835_gpio_rd(pc, GPEDS0 + bank * 4); + events &= mask; events &= pc->enabled_irq_map[bank]; for_each_set_bit(offset, &events, 32) { gpio = (32 * bank) + offset; @@ -409,7 +409,30 @@ static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id) generic_handle_irq(irq_linear_revmap(pc->irq_domain, gpio)); } - return events ? IRQ_HANDLED : IRQ_NONE; + + return (events != 0); +} + +static irqreturn_t bcm2835_gpio_irq_handler(int irq, void *dev_id) +{ + struct bcm2835_gpio_irqdata *irqdata = dev_id; + struct bcm2835_pinctrl *pc = irqdata->pc; + int handled = 0; + + switch (irqdata->irqgroup) { + case 0: /* IRQ0 covers GPIOs 0-27 */ + handled = bcm2835_gpio_irq_handle_bank(pc, 0, 0x0fffffff); + break; + case 1: /* IRQ1 covers GPIOs 28-45 */ + handled = bcm2835_gpio_irq_handle_bank(pc, 0, 0xf0000000) | + bcm2835_gpio_irq_handle_bank(pc, 1, 0x00003fff); + break; + case 2: /* IRQ2 covers GPIOs 46-53 */ + handled = bcm2835_gpio_irq_handle_bank(pc, 1, 0x003fc000); + break; + } + + return handled ? IRQ_HANDLED : IRQ_NONE; } static inline void __bcm2835_gpio_irq_config(struct bcm2835_pinctrl *pc, @@ -1000,8 +1023,6 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev) for (i = 0; i < BCM2835_NUM_BANKS; i++) { unsigned long events; unsigned offset; - int len; - char *name; /* clear event detection flags */ bcm2835_gpio_wr(pc, GPREN0 + i * 4, 0); @@ -1016,10 +1037,15 @@ static int bcm2835_pinctrl_probe(struct platform_device *pdev) for_each_set_bit(offset, &events, 32) bcm2835_gpio_wr(pc, GPEDS0 + i * 4, BIT(offset)); + spin_lock_init(&pc->irq_lock[i]); + } + + for (i = 0; i < BCM2835_NUM_IRQS; i++) { + int len; + char *name; pc->irq[i] = irq_of_parse_and_map(np, i); pc->irq_data[i].pc = pc; - pc->irq_data[i].bank = i; - spin_lock_init(&pc->irq_lock[i]); + pc->irq_data[i].irqgroup = i; len = strlen(dev_name(pc->dev)) + 16; name = devm_kzalloc(pc->dev, len, GFP_KERNEL); @@ -1076,6 +1102,7 @@ static struct platform_driver bcm2835_pinctrl_driver = { .remove = bcm2835_pinctrl_remove, .driver = { .name = MODULE_NAME, + .owner = THIS_MODULE, .of_match_table = bcm2835_pinctrl_match, }, }; -- 2.7.4
