Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3669e930481d6dd510718279cd4bacb15ca3ae91
Commit: 3669e930481d6dd510718279cd4bacb15ca3ae91
Parent: 71bf08b6c083df4ee97874d895f911529f4150dd
Author: Johannes Berg <[EMAIL PROTECTED]>
AuthorDate: Wed May 2 16:33:41 2007 +1000
Committer: Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Mon May 7 20:31:13 2007 +1000
[POWERPC] MPIC sys_device & suspend/resume
This adds mpic to the system devices and implements suspend
and resume for them. This is necessary to get interrupts for
modules back to where they were before a suspend to disk.
Signed-off-by: Johannes Berg <[EMAIL PROTECTED]>
Acked-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
---
arch/powerpc/sysdev/mpic.c | 96 +++++++++++++++++++++++++++++++++++++++++++-
include/asm-powerpc/mpic.h | 15 +++++++
2 files changed, 110 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c
index 57b1208..e88bbd5 100644
--- a/arch/powerpc/sysdev/mpic.c
+++ b/arch/powerpc/sysdev/mpic.c
@@ -354,6 +354,12 @@ static void mpic_startup_ht_interrupt(struct mpic *mpic,
unsigned int source,
tmp |= 0x22;
writel(tmp, fixup->base + 4);
spin_unlock_irqrestore(&mpic->fixup_lock, flags);
+
+#ifdef CONFIG_PM
+ /* use the lowest bit inverted to the actual HW,
+ * set if this fixup was enabled, clear otherwise */
+ mpic->save_data[source].fixup_data = tmp | 1;
+#endif
}
static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
@@ -375,6 +381,12 @@ static void mpic_shutdown_ht_interrupt(struct mpic *mpic,
unsigned int source,
tmp |= 1;
writel(tmp, fixup->base + 4);
spin_unlock_irqrestore(&mpic->fixup_lock, flags);
+
+#ifdef CONFIG_PM
+ /* use the lowest bit inverted to the actual HW,
+ * set if this fixup was enabled, clear otherwise */
+ mpic->save_data[source].fixup_data = tmp & ~1;
+#endif
}
static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
@@ -1143,7 +1155,7 @@ void __init mpic_init(struct mpic *mpic)
/* Do the HT PIC fixups on U3 broken mpic */
DBG("MPIC flags: %x\n", mpic->flags);
if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY))
- mpic_scan_ht_pics(mpic);
+ mpic_scan_ht_pics(mpic);
for (i = 0; i < mpic->num_sources; i++) {
/* start with vector = source number, and masked */
@@ -1167,6 +1179,12 @@ void __init mpic_init(struct mpic *mpic)
/* Set current processor priority to 0 */
mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
+
+#ifdef CONFIG_PM
+ /* allocate memory to save mpic state */
+ mpic->save_data = alloc_bootmem(mpic->num_sources * sizeof(struct
mpic_irq_save));
+ BUG_ON(mpic->save_data == NULL);
+#endif
}
void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
@@ -1420,3 +1438,79 @@ void __devinit smp_mpic_setup_cpu(int cpu)
mpic_setup_this_cpu();
}
#endif /* CONFIG_SMP */
+
+#ifdef CONFIG_PM
+static int mpic_suspend(struct sys_device *dev, pm_message_t state)
+{
+ struct mpic *mpic = container_of(dev, struct mpic, sysdev);
+ int i;
+
+ for (i = 0; i < mpic->num_sources; i++) {
+ mpic->save_data[i].vecprio =
+ mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
+ mpic->save_data[i].dest =
+ mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
+ }
+
+ return 0;
+}
+
+static int mpic_resume(struct sys_device *dev)
+{
+ struct mpic *mpic = container_of(dev, struct mpic, sysdev);
+ int i;
+
+ for (i = 0; i < mpic->num_sources; i++) {
+ mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
+ mpic->save_data[i].vecprio);
+ mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
+ mpic->save_data[i].dest);
+
+#ifdef CONFIG_MPIC_U3_HT_IRQS
+ {
+ struct mpic_irq_fixup *fixup = &mpic->fixups[i];
+
+ if (fixup->base) {
+ /* we use the lowest bit in an inverted meaning */
+ if ((mpic->save_data[i].fixup_data & 1) == 0)
+ continue;
+
+ /* Enable and configure */
+ writeb(0x10 + 2 * fixup->index, fixup->base + 2);
+
+ writel(mpic->save_data[i].fixup_data & ~1,
+ fixup->base + 4);
+ }
+ }
+#endif
+ } /* end for loop */
+
+ return 0;
+}
+#endif
+
+static struct sysdev_class mpic_sysclass = {
+#ifdef CONFIG_PM
+ .resume = mpic_resume,
+ .suspend = mpic_suspend,
+#endif
+ set_kset_name("mpic"),
+};
+
+static int mpic_init_sys(void)
+{
+ struct mpic *mpic = mpics;
+ int error, id = 0;
+
+ error = sysdev_class_register(&mpic_sysclass);
+
+ while (mpic && !error) {
+ mpic->sysdev.cls = &mpic_sysclass;
+ mpic->sysdev.id = id++;
+ error = sysdev_register(&mpic->sysdev);
+ mpic = mpic->next;
+ }
+ return error;
+}
+
+device_initcall(mpic_init_sys);
diff --git a/include/asm-powerpc/mpic.h b/include/asm-powerpc/mpic.h
index e4d5fc5..22c85c4 100644
--- a/include/asm-powerpc/mpic.h
+++ b/include/asm-powerpc/mpic.h
@@ -3,6 +3,7 @@
#ifdef __KERNEL__
#include <linux/irq.h>
+#include <linux/sysdev.h>
#include <asm/dcr.h>
/*
@@ -228,6 +229,14 @@ struct mpic_reg_bank {
#endif /* CONFIG_PPC_DCR */
};
+struct mpic_irq_save {
+ u32 vecprio,
+ dest;
+#ifdef CONFIG_MPIC_U3_HT_IRQS
+ u32 fixup_data;
+#endif
+};
+
/* The instance data of a given MPIC */
struct mpic
{
@@ -294,6 +303,12 @@ struct mpic
/* link */
struct mpic *next;
+
+ struct sys_device sysdev;
+
+#ifdef CONFIG_PM
+ struct mpic_irq_save *save_data;
+#endif
};
/*
-
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