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authorLinus Walleij <linus.walleij@linaro.org>2013-11-26 12:33:41 +0100
committerLinus Walleij <linus.walleij@linaro.org>2014-02-03 09:11:58 +0100
commitf6f293112e3d747e5d39ff0d12793909c3946035 (patch)
tree289c1a01a95644f4ed55888c450c16979cde8199 /drivers/gpio/gpio-pl061.c
parent7808755d4b0ccdaa9e78edfc8cce94f51c5c8da4 (diff)
downloadop-kernel-dev-f6f293112e3d747e5d39ff0d12793909c3946035.zip
op-kernel-dev-f6f293112e3d747e5d39ff0d12793909c3946035.tar.gz
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>
Diffstat (limited to 'drivers/gpio/gpio-pl061.c')
-rw-r--r--drivers/gpio/gpio-pl061.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index eba66c7..93b51e3 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,
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