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powerpc/powernv: Register and handle OPAL interrupts

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We do the minimum which is to "pass" interrupts to HAL, which
makes the console smoother and will allow us to implement
interrupt based completion and console.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2011-09-19 17:45:03 +00:00
parent 5c7c1e9444
commit a125e0928c
1 changed files with 31 additions and 0 deletions
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31
arch/powerpc/platforms/powernv/opal.c
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@ -14,6 +14,7 @@
#include <linux/types.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/interrupt.h>
#include <asm/opal.h>
#include <asm/firmware.h>
@ -135,9 +136,22 @@ int opal_put_chars(uint32_t vtermno, const char *data, int total_len)
return written;
}
static irqreturn_t opal_interrupt(int irq, void *data)
{
uint64_t events;
opal_handle_interrupt(virq_to_hw(irq), &events);
/* XXX TODO: Do something with the events */
return IRQ_HANDLED;
}
static int __init opal_init(void)
{
struct device_node *np, *consoles;
const u32 *irqs;
int rc, i, irqlen;
opal_node = of_find_node_by_path("/ibm,opal");
if (!opal_node) {
@ -156,6 +170,23 @@ static int __init opal_init(void)
of_platform_device_create(np, NULL, NULL);
}
of_node_put(consoles);
/* Find all OPAL interrupts and request them */
irqs = of_get_property(opal_node, "opal-interrupts", &irqlen);
pr_debug("opal: Found %d interrupts reserved for OPAL\n",
irqs ? (irqlen / 4) : 0);
for (i = 0; irqs && i < (irqlen / 4); i++, irqs++) {
unsigned int hwirq = be32_to_cpup(irqs);
unsigned int irq = irq_create_mapping(NULL, hwirq);
if (irq == NO_IRQ) {
pr_warning("opal: Failed to map irq 0x%x\n", hwirq);
continue;
}
rc = request_irq(irq, opal_interrupt, 0, "opal", NULL);
if (rc)
pr_warning("opal: Error %d requesting irq %d"
" (0x%x)\n", rc, irq, hwirq);
}
return 0;
}
subsys_initcall(opal_init);