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Diffstat (limited to 'arch/powerpc/platforms/powernv/opal-irqchip.c')
-rw-r--r--arch/powerpc/platforms/powernv/opal-irqchip.c126
1 files changed, 75 insertions, 51 deletions
diff --git a/arch/powerpc/platforms/powernv/opal-irqchip.c b/arch/powerpc/platforms/powernv/opal-irqchip.c
index 605c7e5d52c2..bc97770a67db 100644
--- a/arch/powerpc/platforms/powernv/opal-irqchip.c
+++ b/arch/powerpc/platforms/powernv/opal-irqchip.c
@@ -22,6 +22,7 @@
#include <linux/kthread.h>
#include <linux/delay.h>
#include <linux/slab.h>
+#include <linux/of_irq.h>
#include <asm/machdep.h>
#include <asm/opal.h>
@@ -38,8 +39,8 @@ struct opal_event_irqchip {
};
static struct opal_event_irqchip opal_event_irqchip;
static u64 last_outstanding_events;
-static unsigned int opal_irq_count;
-static unsigned int *opal_irqs;
+static int opal_irq_count;
+static struct resource *opal_irqs;
void opal_handle_events(void)
{
@@ -165,24 +166,23 @@ void opal_event_shutdown(void)
/* First free interrupts, which will also mask them */
for (i = 0; i < opal_irq_count; i++) {
- if (!opal_irqs[i])
+ if (!opal_irqs || !opal_irqs[i].start)
continue;
if (in_interrupt() || irqs_disabled())
- disable_irq_nosync(opal_irqs[i]);
+ disable_irq_nosync(opal_irqs[i].start);
else
- free_irq(opal_irqs[i], NULL);
+ free_irq(opal_irqs[i].start, NULL);
- opal_irqs[i] = 0;
+ opal_irqs[i].start = 0;
}
}
int __init opal_event_init(void)
{
struct device_node *dn, *opal_node;
- const char **names;
- u32 *irqs;
- int i, rc;
+ bool old_style = false;
+ int i, rc = 0;
opal_node = of_find_node_by_path("/ibm,opal");
if (!opal_node) {
@@ -207,67 +207,91 @@ int __init opal_event_init(void)
goto out;
}
- /* Get opal-interrupts property and names if present */
- rc = of_property_count_u32_elems(opal_node, "opal-interrupts");
- if (rc < 0)
- goto out;
+ /* Look for new-style (standard) "interrupts" property */
+ opal_irq_count = of_irq_count(opal_node);
- opal_irq_count = rc;
- pr_debug("Found %d interrupts reserved for OPAL\n", opal_irq_count);
+ /* Absent ? Look for the old one */
+ if (opal_irq_count < 1) {
+ /* Get opal-interrupts property and names if present */
+ rc = of_property_count_u32_elems(opal_node, "opal-interrupts");
+ if (rc > 0)
+ opal_irq_count = rc;
+ old_style = true;
+ }
- irqs = kcalloc(opal_irq_count, sizeof(*irqs), GFP_KERNEL);
- names = kcalloc(opal_irq_count, sizeof(*names), GFP_KERNEL);
- opal_irqs = kcalloc(opal_irq_count, sizeof(*opal_irqs), GFP_KERNEL);
+ /* No interrupts ? Bail out */
+ if (!opal_irq_count)
+ goto out;
- if (WARN_ON(!irqs || !names || !opal_irqs))
- goto out_free;
+ pr_debug("OPAL: Found %d interrupts reserved for OPAL using %s scheme\n",
+ opal_irq_count, old_style ? "old" : "new");
- rc = of_property_read_u32_array(opal_node, "opal-interrupts",
- irqs, opal_irq_count);
- if (rc < 0) {
- pr_err("Error %d reading opal-interrupts array\n", rc);
- goto out_free;
+ /* Allocate an IRQ resources array */
+ opal_irqs = kcalloc(opal_irq_count, sizeof(struct resource), GFP_KERNEL);
+ if (WARN_ON(!opal_irqs)) {
+ rc = -ENOMEM;
+ goto out;
}
- /* It's not an error for the names to be missing */
- of_property_read_string_array(opal_node, "opal-interrupts-names",
- names, opal_irq_count);
+ /* Build the resources array */
+ if (old_style) {
+ /* Old style "opal-interrupts" property */
+ for (i = 0; i < opal_irq_count; i++) {
+ struct resource *r = &opal_irqs[i];
+ const char *name = NULL;
+ u32 hw_irq;
+ int virq;
+
+ rc = of_property_read_u32_index(opal_node, "opal-interrupts",
+ i, &hw_irq);
+ if (WARN_ON(rc < 0)) {
+ opal_irq_count = i;
+ break;
+ }
+ of_property_read_string_index(opal_node, "opal-interrupts-names",
+ i, &name);
+ virq = irq_create_mapping(NULL, hw_irq);
+ if (!virq) {
+ pr_warn("Failed to map OPAL irq 0x%x\n", hw_irq);
+ continue;
+ }
+ r->start = r->end = virq;
+ r->flags = IORESOURCE_IRQ | IRQ_TYPE_LEVEL_LOW;
+ r->name = name;
+ }
+ } else {
+ /* new style standard "interrupts" property */
+ rc = of_irq_to_resource_table(opal_node, opal_irqs, opal_irq_count);
+ if (WARN_ON(rc < 0)) {
+ opal_irq_count = 0;
+ kfree(opal_irqs);
+ goto out;
+ }
+ if (WARN_ON(rc < opal_irq_count))
+ opal_irq_count = rc;
+ }
/* Install interrupt handlers */
for (i = 0; i < opal_irq_count; i++) {
- unsigned int virq;
- char *name;
-
- /* Get hardware and virtual IRQ */
- virq = irq_create_mapping(NULL, irqs[i]);
- if (!virq) {
- pr_warn("Failed to map irq 0x%x\n", irqs[i]);
- continue;
- }
+ struct resource *r = &opal_irqs[i];
+ const char *name;
- if (names[i] && strlen(names[i]))
- name = kasprintf(GFP_KERNEL, "opal-%s", names[i]);
+ /* Prefix name */
+ if (r->name && strlen(r->name))
+ name = kasprintf(GFP_KERNEL, "opal-%s", r->name);
else
name = kasprintf(GFP_KERNEL, "opal");
/* Install interrupt handler */
- rc = request_irq(virq, opal_interrupt, IRQF_TRIGGER_LOW,
+ rc = request_irq(r->start, opal_interrupt, r->flags & IRQD_TRIGGER_MASK,
name, NULL);
if (rc) {
- irq_dispose_mapping(virq);
- pr_warn("Error %d requesting irq %d (0x%x)\n",
- rc, virq, irqs[i]);
+ pr_warn("Error %d requesting OPAL irq %d\n", rc, (int)r->start);
continue;
}
-
- /* Cache IRQ */
- opal_irqs[i] = virq;
}
-
-out_free:
- kfree(irqs);
- kfree(names);
-out:
+ rc = 0;
+ out:
of_node_put(opal_node);
return rc;
}