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cns3xxx: Adopt irq_domain support for cns3xxx gpio driver 

Have gpio driver adopt irqdomain support so that there are
non-overlapping allocations of irq numbers mapped to gpio's.

Signed-off-by: Pushpal Sidhu <psidhu@gateworks.com>

Backport of r42844

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42847 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2014-10-08 10:29:32 +00:00
parent a5d6fa0d40
commit 2a00154f9a
1 changed files with 23 additions and 7 deletions
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30
target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/gpio.c
View File

@ -15,6 +15,7 @@
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <asm/mach/irq.h>
@ -45,9 +46,9 @@
struct cns3xxx_gpio_chip {
struct gpio_chip chip;
struct irq_domain *domain;
spinlock_t lock;
void __iomem *base;
int secondary_irq_base;
};
static struct cns3xxx_gpio_chip cns3xxx_gpio_chips[2];
@ -127,7 +128,7 @@ static int cns3xxx_gpio_to_irq(struct gpio_chip *chip, unsigned pin)
struct cns3xxx_gpio_chip *cchip =
container_of(chip, struct cns3xxx_gpio_chip, chip);
return cchip->secondary_irq_base + pin;
return irq_find_mapping(cchip->domain, pin);
}
@ -152,7 +153,7 @@ static void cns3xxx_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
for (i = 0; i < 32; i++) {
if (reg & (1 << i)) {
/* let the generic IRQ layer handle an interrupt */
generic_handle_irq(cchip->secondary_irq_base + i);
generic_handle_irq(irq_find_mapping(cchip->domain, i));
}
}
@ -163,7 +164,7 @@ static int cns3xxx_gpio_irq_set_type(struct irq_data *d, u32 irqtype)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
struct cns3xxx_gpio_chip *cchip = gc->private;
u32 gpio = d->irq - cchip->secondary_irq_base;
u32 gpio = d->hwirq;
unsigned long flags;
u32 method, edges, type;
@ -224,6 +225,7 @@ void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
struct irq_chip_generic *gc;
struct irq_chip_type *ct;
char gc_label[16];
int irq_base;
if (cns3xxx_gpio_chip_count == ARRAY_SIZE(cns3xxx_gpio_chips))
return;
@ -243,7 +245,6 @@ void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
cchip->chip.can_sleep = 0;
spin_lock_init(&cchip->lock);
cchip->base = (void __iomem *)base;
cchip->secondary_irq_base = secondary_irq_base;
BUG_ON(gpiochip_add(&cchip->chip) < 0);
cns3xxx_gpio_chip_count++;
@ -251,11 +252,22 @@ void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
/* clear GPIO interrupts */
__raw_writel(0xffff, cchip->base + GPIO_INTERRUPT_CLEAR);
irq_base = irq_alloc_descs(-1, secondary_irq_base, ngpio,
numa_node_id());
if (irq_base < 0)
goto out_irqdesc_free;
cchip->domain = irq_domain_add_legacy(NULL, ngpio, irq_base, 0,
&irq_domain_simple_ops, NULL);
if (!cchip->domain)
goto out_irqdesc_free;
/*
* IRQ chip init
*/
gc = irq_alloc_generic_chip("cns3xxx_gpio_irq", 1, secondary_irq_base,
gc = irq_alloc_generic_chip("cns3xxx_gpio_irq", 1, irq_base,
cchip->base, handle_edge_irq);
gc->private = cchip;
ct = gc->chip_types;
@ -270,7 +282,11 @@ void __init cns3xxx_gpio_init(int gpio_base, int ngpio,
irq_setup_generic_chip(gc, IRQ_MSK(ngpio), IRQ_GC_INIT_MASK_CACHE,
IRQ_NOREQUEST, 0);
irq_set_chained_handler(irq, cns3xxx_gpio_irq_handler);
irq_set_handler_data(irq, cchip);
return;
out_irqdesc_free:
irq_free_descs(irq_base, ngpio);
}