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authorJulia Cartwright <julia@ni.com>2017-03-09 10:21:56 -0600
committerLinus Walleij <linus.walleij@linaro.org>2017-03-16 21:52:09 +0100
commit99b9b45de8808994ea9a176241e52bb6fab71cdd (patch)
treed2c4510f7c993aa6c59bb366860f3bcb67ed37e1 /drivers/gpio/gpio-pl061.c
parentf9c56536d50b4c55d42d7fb3396501906f7518fa (diff)
gpio: pl061: make use of raw_spinlock variants
The pl061 gpio driver currently implements an irq_chip for handling interrupts; due to how irq_chip handling is done, it's necessary for the irq_chip methods to be invoked from hardirq context, even on a a real-time kernel. Because the spinlock_t type becomes a "sleeping" spinlock w/ RT kernels, it is not suitable to be used with irq_chips. A quick audit of the operations under the lock reveal that they do only minimal, bounded work, and are therefore safe to do under a raw spinlock. Signed-off-by: Julia Cartwright <julia@ni.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pl061.c')
-rw-r--r--drivers/gpio/gpio-pl061.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
index 0a6bfd2b06e5..3d3d6b6645a7 100644
--- a/drivers/gpio/gpio-pl061.c
+++ b/drivers/gpio/gpio-pl061.c
@@ -50,7 +50,7 @@ struct pl061_context_save_regs {
#endif
struct pl061 {
- spinlock_t lock;
+ raw_spinlock_t lock;
void __iomem *base;
struct gpio_chip gc;
@@ -74,11 +74,11 @@ static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
unsigned long flags;
unsigned char gpiodir;
- spin_lock_irqsave(&pl061->lock, flags);
+ raw_spin_lock_irqsave(&pl061->lock, flags);
gpiodir = readb(pl061->base + GPIODIR);
gpiodir &= ~(BIT(offset));
writeb(gpiodir, pl061->base + GPIODIR);
- spin_unlock_irqrestore(&pl061->lock, flags);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
}
@@ -90,7 +90,7 @@ static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
unsigned long flags;
unsigned char gpiodir;
- spin_lock_irqsave(&pl061->lock, flags);
+ raw_spin_lock_irqsave(&pl061->lock, flags);
writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
gpiodir = readb(pl061->base + GPIODIR);
gpiodir |= BIT(offset);
@@ -101,7 +101,7 @@ static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
* a gpio pin before configuring it in OUT mode.
*/
writeb(!!value << offset, pl061->base + (BIT(offset + 2)));
- spin_unlock_irqrestore(&pl061->lock, flags);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
}
@@ -143,7 +143,7 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
}
- spin_lock_irqsave(&pl061->lock, flags);
+ raw_spin_lock_irqsave(&pl061->lock, flags);
gpioiev = readb(pl061->base + GPIOIEV);
gpiois = readb(pl061->base + GPIOIS);
@@ -203,7 +203,7 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
writeb(gpioibe, pl061->base + GPIOIBE);
writeb(gpioiev, pl061->base + GPIOIEV);
- spin_unlock_irqrestore(&pl061->lock, flags);
+ raw_spin_unlock_irqrestore(&pl061->lock, flags);
return 0;
}
@@ -235,10 +235,10 @@ static void pl061_irq_mask(struct irq_data *d)
u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
u8 gpioie;
- spin_lock(&pl061->lock);
+ raw_spin_lock(&pl061->lock);
gpioie = readb(pl061->base + GPIOIE) & ~mask;
writeb(gpioie, pl061->base + GPIOIE);
- spin_unlock(&pl061->lock);
+ raw_spin_unlock(&pl061->lock);
}
static void pl061_irq_unmask(struct irq_data *d)
@@ -248,10 +248,10 @@ static void pl061_irq_unmask(struct irq_data *d)
u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
u8 gpioie;
- spin_lock(&pl061->lock);
+ raw_spin_lock(&pl061->lock);
gpioie = readb(pl061->base + GPIOIE) | mask;
writeb(gpioie, pl061->base + GPIOIE);
- spin_unlock(&pl061->lock);
+ raw_spin_unlock(&pl061->lock);
}
/**
@@ -268,9 +268,9 @@ static void pl061_irq_ack(struct irq_data *d)
struct pl061 *pl061 = gpiochip_get_data(gc);
u8 mask = BIT(irqd_to_hwirq(d) % PL061_GPIO_NR);
- spin_lock(&pl061->lock);
+ raw_spin_lock(&pl061->lock);
writeb(mask, pl061->base + GPIOIC);
- spin_unlock(&pl061->lock);
+ raw_spin_unlock(&pl061->lock);
}
static int pl061_irq_set_wake(struct irq_data *d, unsigned int state)
@@ -304,7 +304,7 @@ static int pl061_probe(struct amba_device *adev, const struct amba_id *id)
if (IS_ERR(pl061->base))
return PTR_ERR(pl061->base);
- spin_lock_init(&pl061->lock);
+ raw_spin_lock_init(&pl061->lock);
if (of_property_read_bool(dev->of_node, "gpio-ranges")) {
pl061->gc.request = gpiochip_generic_request;
pl061->gc.free = gpiochip_generic_free;