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pinctrl: rockchip: Fix enable/disable/mask/unmask

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The Rockchip pinctrl driver was only implementing the "mask" and
"unmask" operations though the hardware actually has two distinct
things: enable/disable and mask/unmask.  It was implementing the
"mask" operations as a hardware enable/disable and always leaving all
interrupts unmasked.

I believe that the old system had some downsides, specifically:
- (Untested) if an interrupt went off while interrupts were "masked"
  it would be lost.  Now it will be kept track of.
- If someone wanted to change an interrupt back into a GPIO (is such a
  thing sensible?) by calling irq_disable() it wouldn't actually take
  effect.  That's because Linux does some extra optimizations when
  there's no true "disable" function: it does a lazy mask.

Let's actually implement enable/disable/mask/unmask properly.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Doug Anderson 2014-11-19 14:51:33 -08:00 committed by Linus Walleij
parent 68bda47c57
commit f2dd028c26
1 changed files with 33 additions and 3 deletions
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36
drivers/pinctrl/pinctrl-rockchip.c
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@ -1562,6 +1562,34 @@ static void rockchip_irq_resume(struct irq_data *d)
irq_reg_writel(gc, bank->saved_enables, GPIO_INTEN);
}
static void rockchip_irq_disable(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 val;
irq_gc_lock(gc);
val = irq_reg_readl(gc, GPIO_INTEN);
val &= ~d->mask;
irq_reg_writel(gc, val, GPIO_INTEN);
irq_gc_unlock(gc);
}
static void rockchip_irq_enable(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
u32 val;
irq_gc_lock(gc);
val = irq_reg_readl(gc, GPIO_INTEN);
val |= d->mask;
irq_reg_writel(gc, val, GPIO_INTEN);
irq_gc_unlock(gc);
}
static int rockchip_interrupts_register(struct platform_device *pdev,
struct rockchip_pinctrl *info)
{
@ -1600,11 +1628,13 @@ static int rockchip_interrupts_register(struct platform_device *pdev,
gc = irq_get_domain_generic_chip(bank->domain, 0);
gc->reg_base = bank->reg_base;
gc->private = bank;
gc->chip_types[0].regs.mask = GPIO_INTEN;
gc->chip_types[0].regs.mask = GPIO_INTMASK;
gc->chip_types[0].regs.ack = GPIO_PORTS_EOI;
gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
gc->chip_types[0].chip.irq_enable = rockchip_irq_enable;
gc->chip_types[0].chip.irq_disable = rockchip_irq_disable;
gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
gc->chip_types[0].chip.irq_suspend = rockchip_irq_suspend;
gc->chip_types[0].chip.irq_resume = rockchip_irq_resume;