[PATCH 5.19 175/207] gpio: ixp4xx: Make irqchip immutable

Greg Kroah-Hartman
2022-09-26T11:59:34Z

From: Linus Walleij <linus.walleij@linaro.org>

[ Upstream commit 94e9bc73d85aa6ecfe249e985ff57abe0ab35f34 ]

This turns the IXP4xx GPIO irqchip into an immutable
irqchip, a bit different from the standard template due
to being hierarchical.

Tested on the IXP4xx which uses drivers/ata/pata_ixp4xx_cf.c
for a rootfs on compact flash with IRQs from this GPIO
block to the CF ATA controller.

Cc: Marc Zyngier <maz@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpio/gpio-ixp4xx.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpio-ixp4xx.c b/drivers/gpio/gpio-ixp4xx.c
index 312309be0287..56656fb519f8 100644
--- a/drivers/gpio/gpio-ixp4xx.c
+++ b/drivers/gpio/gpio-ixp4xx.c
@@ -63,6 +63,14 @@ static void ixp4xx_gpio_irq_ack(struct irq_data *d)
__raw_writel(BIT(d->hwirq), g->base + IXP4XX_REG_GPIS);
}

+static void ixp4xx_gpio_mask_irq(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+
+ irq_chip_mask_parent(d);
+ gpiochip_disable_irq(gc, d->hwirq);
+}
+
static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -72,6 +80,7 @@ static void ixp4xx_gpio_irq_unmask(struct irq_data *d)
if (!(g->irq_edge & BIT(d->hwirq)))
ixp4xx_gpio_irq_ack(d);

+ gpiochip_enable_irq(gc, d->hwirq);
irq_chip_unmask_parent(d);
}

@@ -149,12 +158,14 @@ static int ixp4xx_gpio_irq_set_type(struct irq_data *d, unsigned int type)
return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);
}

-static struct irq_chip ixp4xx_gpio_irqchip = {
+static const struct irq_chip ixp4xx_gpio_irqchip = {
.name = "IXP4GPIO",
.irq_ack = ixp4xx_gpio_irq_ack,
- .irq_mask = irq_chip_mask_parent,
+ .irq_mask = ixp4xx_gpio_mask_irq,
.irq_unmask = ixp4xx_gpio_irq_unmask,
.irq_set_type = ixp4xx_gpio_irq_set_type,
+ .flags = IRQCHIP_IMMUTABLE,
+ GPIOCHIP_IRQ_RESOURCE_HELPERS,
};

static int ixp4xx_gpio_child_to_parent_hwirq(struct gpio_chip *gc,
@@ -263,7 +274,7 @@ static int ixp4xx_gpio_probe(struct platform_device *pdev)
g->gc.owner = THIS_MODULE;

girq = &g->gc.irq;
- girq->chip = &ixp4xx_gpio_irqchip;
+ gpio_irq_chip_set_chip(girq, &ixp4xx_gpio_irqchip);
girq->fwnode = g->fwnode;
girq->parent_domain = parent;
girq->child_to_parent_hwirq = ixp4xx_gpio_child_to_parent_hwirq;
--
2.35.1