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pinctrl: rockchip: Protect read-modify-write with the spinlock 

There were a few instances where the rockchip pinctrl driver would do
read-modify-write with no spinlock.  Add a spinlock for these cases.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Doug Anderson 2014-10-21 10:47:35 -07:00 committed by Heiko Stuebner
parent 0fb7dcb1b3
commit fab262f500
1 changed files with 18 additions and 0 deletions
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18
drivers/pinctrl/pinctrl-rockchip.c
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@ -861,6 +861,7 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
{
struct rockchip_pin_bank *bank;
int ret;
unsigned long flags;
u32 data;
bank = gc_to_pin_bank(chip);
@ -869,6 +870,8 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
if (ret < 0)
return ret;
spin_lock_irqsave(&bank->slock, flags);
data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
/* set bit to 1 for output, 0 for input */
if (!input)
@ -877,6 +880,8 @@ static int _rockchip_pmx_gpio_set_direction(struct gpio_chip *chip,
data &= ~BIT(pin);
writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
spin_unlock_irqrestore(&bank->slock, flags);
return 0;
}
@ -1394,6 +1399,7 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
u32 polarity = 0, data = 0;
u32 pend;
bool edge_changed = false;
unsigned long flags;
dev_dbg(bank->drvdata->dev, "got irq for bank %s\n", bank->name);
@ -1439,10 +1445,14 @@ static void rockchip_irq_demux(unsigned int irq, struct irq_desc *desc)
if (bank->toggle_edge_mode && edge_changed) {
/* Interrupt params should only be set with ints disabled */
spin_lock_irqsave(&bank->slock, flags);
data = readl_relaxed(bank->reg_base + GPIO_INTEN);
writel_relaxed(0, bank->reg_base + GPIO_INTEN);
writel(polarity, bank->reg_base + GPIO_INT_POLARITY);
writel(data, bank->reg_base + GPIO_INTEN);
spin_unlock_irqrestore(&bank->slock, flags);
}
chained_irq_exit(chip, desc);
@ -1456,6 +1466,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
u32 polarity;
u32 level;
u32 data;
unsigned long flags;
int ret;
/* make sure the pin is configured as gpio input */
@ -1463,15 +1474,20 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
if (ret < 0)
return ret;
spin_lock_irqsave(&bank->slock, flags);
data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
data &= ~mask;
writel_relaxed(data, bank->reg_base + GPIO_SWPORT_DDR);
spin_unlock_irqrestore(&bank->slock, flags);
if (type & IRQ_TYPE_EDGE_BOTH)
__irq_set_handler_locked(d->irq, handle_edge_irq);
else
__irq_set_handler_locked(d->irq, handle_level_irq);
spin_lock_irqsave(&bank->slock, flags);
irq_gc_lock(gc);
level = readl_relaxed(gc->reg_base + GPIO_INTTYPE_LEVEL);
@ -1514,6 +1530,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
break;
default:
irq_gc_unlock(gc);
spin_unlock_irqrestore(&bank->slock, flags);
return -EINVAL;
}
@ -1521,6 +1538,7 @@ static int rockchip_irq_set_type(struct irq_data *d, unsigned int type)
writel_relaxed(polarity, gc->reg_base + GPIO_INT_POLARITY);
irq_gc_unlock(gc);
spin_unlock_irqrestore(&bank->slock, flags);
return 0;
}