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pinctrl: sunxi: Properly handle level triggered gpio interrupts

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For level triggered gpio interrupts we need to use handle_fasteoi_irq,
like we do with the irq-sunxi-nmi driver. This is necessary to give threaded
interrupt handlers a chance to actuall clear the source of the interrupt
(which may involve sleeping waiting for i2c / spi / mmc transfers), before
acknowledging the interrupt.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Hans de Goede 2014-06-29 16:11:01 +02:00 committed by Linus Walleij
parent fea6d8efd0
commit f4c51c103b
1 changed files with 31 additions and 8 deletions
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39
drivers/pinctrl/sunxi/pinctrl-sunxi.c
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@ -31,6 +31,9 @@
#include "../core.h"
#include "pinctrl-sunxi.h"
static struct irq_chip sunxi_pinctrl_edge_irq_chip;
static struct irq_chip sunxi_pinctrl_level_irq_chip;
static struct sunxi_pinctrl_group *
sunxi_pinctrl_find_group_by_name(struct sunxi_pinctrl *pctl, const char *group)
{
@ -547,10 +550,10 @@ static int sunxi_pinctrl_irq_request_resources(struct irq_data *d)
return 0;
}
static int sunxi_pinctrl_irq_set_type(struct irq_data *d,
unsigned int type)
static int sunxi_pinctrl_irq_set_type(struct irq_data *d, unsigned int type)
{
struct sunxi_pinctrl *pctl = irq_data_get_irq_chip_data(d);
struct irq_desc *desc = container_of(d, struct irq_desc, irq_data);
u32 reg = sunxi_irq_cfg_reg(d->hwirq);
u8 index = sunxi_irq_cfg_offset(d->hwirq);
unsigned long flags;
@ -577,6 +580,14 @@ static int sunxi_pinctrl_irq_set_type(struct irq_data *d,
return -EINVAL;
}
if (type & IRQ_TYPE_LEVEL_MASK) {
d->chip = &sunxi_pinctrl_level_irq_chip;
desc->handle_irq = handle_fasteoi_irq;
} else {
d->chip = &sunxi_pinctrl_edge_irq_chip;
desc->handle_irq = handle_edge_irq;
}
spin_lock_irqsave(&pctl->lock, flags);
regval = readl(pctl->membase + reg);
@ -632,7 +643,7 @@ static void sunxi_pinctrl_irq_unmask(struct irq_data *d)
spin_unlock_irqrestore(&pctl->lock, flags);
}
static struct irq_chip sunxi_pinctrl_irq_chip = {
static struct irq_chip sunxi_pinctrl_edge_irq_chip = {
.irq_ack = sunxi_pinctrl_irq_ack,
.irq_mask = sunxi_pinctrl_irq_mask,
.irq_unmask = sunxi_pinctrl_irq_unmask,
@ -641,6 +652,16 @@ static struct irq_chip sunxi_pinctrl_irq_chip = {
.flags = IRQCHIP_SKIP_SET_WAKE,
};
static struct irq_chip sunxi_pinctrl_level_irq_chip = {
.irq_eoi = sunxi_pinctrl_irq_ack,
.irq_mask = sunxi_pinctrl_irq_mask,
.irq_unmask = sunxi_pinctrl_irq_unmask,
.irq_request_resources = sunxi_pinctrl_irq_request_resources,
.irq_set_type = sunxi_pinctrl_irq_set_type,
.flags = IRQCHIP_SKIP_SET_WAKE | IRQCHIP_EOI_THREADED |
IRQCHIP_EOI_IF_HANDLED,
};
static void sunxi_pinctrl_irq_handler(unsigned irq, struct irq_desc *desc)
{
struct irq_chip *chip = irq_get_chip(irq);
@ -657,9 +678,6 @@ static void sunxi_pinctrl_irq_handler(unsigned irq, struct irq_desc *desc)
reg = sunxi_irq_status_reg_from_bank(bank);
val = readl(pctl->membase + reg);
/* Clear all interrupts */
writel(val, pctl->membase + reg);
if (val) {
int irqoffset;
@ -929,12 +947,17 @@ int sunxi_pinctrl_init(struct platform_device *pdev,
for (i = 0; i < (pctl->desc->irq_banks * IRQ_PER_BANK); i++) {
int irqno = irq_create_mapping(pctl->domain, i);
irq_set_chip_and_handler(irqno, &sunxi_pinctrl_irq_chip,
handle_simple_irq);
irq_set_chip_and_handler(irqno, &sunxi_pinctrl_edge_irq_chip,
handle_edge_irq);
irq_set_chip_data(irqno, pctl);
};
for (i = 0; i < pctl->desc->irq_banks; i++) {
/* Mask and clear all IRQs before registering a handler */
writel(0, pctl->membase + sunxi_irq_ctrl_reg_from_bank(i));
writel(0xffffffff,
pctl->membase + sunxi_irq_status_reg_from_bank(i));
irq_set_chained_handler(pctl->irq[i],
sunxi_pinctrl_irq_handler);
irq_set_handler_data(pctl->irq[i], pctl);