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ARM: sa1111: implement support for sparse IRQs 

Implement the necessary allocation/freeing functionality to support
sparse IRQs with the SA-1111 device.  On non-sparse IRQ platforms,
this allows us to dynamically allocate from within the available IRQ
number space.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-01-24 21:25:20 +00:00
parent f03ecaa0aa
commit 36d3121302
1 changed files with 32 additions and 11 deletions
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43
arch/arm/common/sa1111.c
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@ -16,6 +16,7 @@
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
@ -28,9 +29,8 @@
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/irq.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
#include <asm/sizes.h>
#include <asm/hardware/sa1111.h>
@ -86,6 +86,7 @@
#define IRQ_S1_CD_VALID (52)
#define IRQ_S0_BVD1_STSCHG (53)
#define IRQ_S1_BVD1_STSCHG (54)
#define SA1111_IRQ_NR (55)
extern void sa1110_mb_enable(void);
extern void sa1110_mb_disable(void);
@ -435,16 +436,28 @@ static struct irq_chip sa1111_high_chip = {
.irq_set_wake = sa1111_wake_highirq,
};
static void sa1111_setup_irq(struct sa1111 *sachip)
static int sa1111_setup_irq(struct sa1111 *sachip, unsigned irq_base)
{
void __iomem *irqbase = sachip->base + SA1111_INTC;
unsigned i, irq;
int ret;
/*
* We're guaranteed that this region hasn't been taken.
*/
request_mem_region(sachip->phys + SA1111_INTC, 512, "irq");
ret = irq_alloc_descs(-1, irq_base, SA1111_IRQ_NR, -1);
if (ret <= 0) {
dev_err(sachip->dev, "unable to allocate %u irqs: %d\n",
SA1111_IRQ_NR, ret);
if (ret == 0)
ret = -EINVAL;
return ret;
}
sachip->irq_base = ret;
/* disable all IRQs */
sa1111_writel(0, irqbase + SA1111_INTEN0);
sa1111_writel(0, irqbase + SA1111_INTEN1);
@ -486,6 +499,11 @@ static void sa1111_setup_irq(struct sa1111 *sachip)
irq_set_irq_type(sachip->irq, IRQ_TYPE_EDGE_RISING);
irq_set_handler_data(sachip->irq, sachip);
irq_set_chained_handler(sachip->irq, sa1111_irq_handler);
dev_info(sachip->dev, "Providing IRQ%u-%u\n",
sachip->irq_base, sachip->irq_base + SA1111_IRQ_NR - 1);
return 0;
}
/*
@ -740,7 +758,6 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
sachip->phys = mem->start;
sachip->irq = irq;
sachip->irq_base = pd->irq_base;
/*
* Map the whole region. This also maps the
@ -771,6 +788,16 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
*/
sa1111_wake(sachip);
/*
* The interrupt controller must be initialised before any
* other device to ensure that the interrupts are available.
*/
if (sachip->irq != NO_IRQ) {
ret = sa1111_setup_irq(sachip, pd->irq_base);
if (ret)
goto err_unmap;
}
#ifdef CONFIG_ARCH_SA1100
{
unsigned int val;
@ -801,13 +828,6 @@ __sa1111_probe(struct device *me, struct resource *mem, int irq)
}
#endif
/*
* The interrupt controller must be initialised before any
* other device to ensure that the interrupts are available.
*/
if (sachip->irq != NO_IRQ)
sa1111_setup_irq(sachip);
g_sa1111 = sachip;
has_devs = ~0;
@ -858,6 +878,7 @@ static void __sa1111_remove(struct sa1111 *sachip)
if (sachip->irq != NO_IRQ) {
irq_set_chained_handler(sachip->irq, NULL);
irq_set_handler_data(sachip->irq, NULL);
irq_free_descs(sachip->irq_base, SA1111_IRQ_NR);
release_mem_region(sachip->phys + SA1111_INTC, 512);
}