gpio: pl061: lock IRQs when starting them

This uses the new API for tagging GPIO lines as in use by
IRQs. This enforces a few semantic checks on how the underlying
GPIO line is used.

Cc: Haojian Zhuang <haojian.zhuang@linaro.org>
Cc: Deepak Sikri <deepak.sikri@st.com>
Acked-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 22 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index eba66c7efb18..93b51e339a27 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -231,11 +231,33 @@ static void pl061_irq_unmask(struct irq_data *d)
         spin_unlock(&chip->lock);
 }
 
+static unsigned int pl061_irq_startup(struct irq_data *d)
+{
+        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+
+        if (gpio_lock_as_irq(&chip->gc, irqd_to_hwirq(d)))
+                dev_err(chip->gc.dev,
+                        "unable to lock HW IRQ %lu for IRQ\n",
+                        irqd_to_hwirq(d));
+        pl061_irq_unmask(d);
+        return 0;
+}
+
+static void pl061_irq_shutdown(struct irq_data *d)
+{
+        struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+
+        pl061_irq_mask(d);
+        gpio_unlock_as_irq(&chip->gc, irqd_to_hwirq(d));
+}
+
 static struct irq_chip pl061_irqchip = {
         .name           = "pl061 gpio",
         .irq_mask       = pl061_irq_mask,
         .irq_unmask     = pl061_irq_unmask,
         .irq_set_type   = pl061_irq_type,
+        .irq_startup    = pl061_irq_startup,
+        .irq_shutdown   = pl061_irq_shutdown,
 };
 
 static int pl061_irq_map(struct irq_domain *d, unsigned int irq,