Merge branch 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git...
[linux-3.10.git] / arch / arm / common / gic.c
index bdbb3f7..a8fc6b2 100644 (file)
 #include <linux/kernel.h>
 #include <linux/list.h>
 #include <linux/smp.h>
+#include <linux/cpu_pm.h>
 #include <linux/cpumask.h>
 #include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+#include <linux/slab.h>
 
 #include <asm/irq.h>
 #include <asm/mach/irq.h>
@@ -262,6 +266,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic,
        u32 cpumask;
        void __iomem *base = gic->dist_base;
        u32 cpu = 0;
+       u32 nrppis = 0, ppi_base = 0;
 
 #ifdef CONFIG_SMP
        cpu = cpu_logical_map(smp_processor_id());
@@ -282,6 +287,25 @@ static void __init gic_dist_init(struct gic_chip_data *gic,
        if (gic_irqs > 1020)
                gic_irqs = 1020;
 
+       gic->gic_irqs = gic_irqs;
+
+       /*
+        * Nobody would be insane enough to use PPIs on a secondary
+        * GIC, right?
+        */
+       if (gic == &gic_data[0]) {
+               nrppis = (32 - irq_start) & 31;
+
+               /* The GIC only supports up to 16 PPIs. */
+               if (nrppis > 16)
+                       BUG();
+
+               ppi_base = gic->irq_offset + 32 - nrppis;
+       }
+
+       pr_info("Configuring GIC with %d sources (%d PPIs)\n",
+               gic_irqs, (gic == &gic_data[0]) ? nrppis : 0);
+
        /*
         * Set all global interrupts to be level triggered, active low.
         */
@@ -317,7 +341,17 @@ static void __init gic_dist_init(struct gic_chip_data *gic,
        /*
         * Setup the Linux IRQ subsystem.
         */
-       for (i = irq_start; i < irq_limit; i++) {
+       for (i = 0; i < nrppis; i++) {
+               int ppi = i + ppi_base;
+
+               irq_set_percpu_devid(ppi);
+               irq_set_chip_and_handler(ppi, &gic_chip,
+                                        handle_percpu_devid_irq);
+               irq_set_chip_data(ppi, gic);
+               set_irq_flags(ppi, IRQF_VALID | IRQF_NOAUTOEN);
+       }
+
+       for (i = irq_start + nrppis; i < irq_limit; i++) {
                irq_set_chip_and_handler(i, &gic_chip, handle_fasteoi_irq);
                irq_set_chip_data(i, gic);
                set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
@@ -349,6 +383,189 @@ static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
        writel_relaxed(1, base + GIC_CPU_CTRL);
 }
 
+#ifdef CONFIG_CPU_PM
+/*
+ * Saves the GIC distributor registers during suspend or idle.  Must be called
+ * with interrupts disabled but before powering down the GIC.  After calling
+ * this function, no interrupts will be delivered by the GIC, and another
+ * platform-specific wakeup source must be enabled.
+ */
+static void gic_dist_save(unsigned int gic_nr)
+{
+       unsigned int gic_irqs;
+       void __iomem *dist_base;
+       int i;
+
+       if (gic_nr >= MAX_GIC_NR)
+               BUG();
+
+       gic_irqs = gic_data[gic_nr].gic_irqs;
+       dist_base = gic_data[gic_nr].dist_base;
+
+       if (!dist_base)
+               return;
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
+               gic_data[gic_nr].saved_spi_conf[i] =
+                       readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+               gic_data[gic_nr].saved_spi_target[i] =
+                       readl_relaxed(dist_base + GIC_DIST_TARGET + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
+               gic_data[gic_nr].saved_spi_enable[i] =
+                       readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+}
+
+/*
+ * Restores the GIC distributor registers during resume or when coming out of
+ * idle.  Must be called before enabling interrupts.  If a level interrupt
+ * that occured while the GIC was suspended is still present, it will be
+ * handled normally, but any edge interrupts that occured will not be seen by
+ * the GIC and need to be handled by the platform-specific wakeup source.
+ */
+static void gic_dist_restore(unsigned int gic_nr)
+{
+       unsigned int gic_irqs;
+       unsigned int i;
+       void __iomem *dist_base;
+
+       if (gic_nr >= MAX_GIC_NR)
+               BUG();
+
+       gic_irqs = gic_data[gic_nr].gic_irqs;
+       dist_base = gic_data[gic_nr].dist_base;
+
+       if (!dist_base)
+               return;
+
+       writel_relaxed(0, dist_base + GIC_DIST_CTRL);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 16); i++)
+               writel_relaxed(gic_data[gic_nr].saved_spi_conf[i],
+                       dist_base + GIC_DIST_CONFIG + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+               writel_relaxed(0xa0a0a0a0,
+                       dist_base + GIC_DIST_PRI + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 4); i++)
+               writel_relaxed(gic_data[gic_nr].saved_spi_target[i],
+                       dist_base + GIC_DIST_TARGET + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(gic_irqs, 32); i++)
+               writel_relaxed(gic_data[gic_nr].saved_spi_enable[i],
+                       dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+       writel_relaxed(1, dist_base + GIC_DIST_CTRL);
+}
+
+static void gic_cpu_save(unsigned int gic_nr)
+{
+       int i;
+       u32 *ptr;
+       void __iomem *dist_base;
+       void __iomem *cpu_base;
+
+       if (gic_nr >= MAX_GIC_NR)
+               BUG();
+
+       dist_base = gic_data[gic_nr].dist_base;
+       cpu_base = gic_data[gic_nr].cpu_base;
+
+       if (!dist_base || !cpu_base)
+               return;
+
+       ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+       for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
+               ptr[i] = readl_relaxed(dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+       ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+       for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
+               ptr[i] = readl_relaxed(dist_base + GIC_DIST_CONFIG + i * 4);
+
+}
+
+static void gic_cpu_restore(unsigned int gic_nr)
+{
+       int i;
+       u32 *ptr;
+       void __iomem *dist_base;
+       void __iomem *cpu_base;
+
+       if (gic_nr >= MAX_GIC_NR)
+               BUG();
+
+       dist_base = gic_data[gic_nr].dist_base;
+       cpu_base = gic_data[gic_nr].cpu_base;
+
+       if (!dist_base || !cpu_base)
+               return;
+
+       ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_enable);
+       for (i = 0; i < DIV_ROUND_UP(32, 32); i++)
+               writel_relaxed(ptr[i], dist_base + GIC_DIST_ENABLE_SET + i * 4);
+
+       ptr = __this_cpu_ptr(gic_data[gic_nr].saved_ppi_conf);
+       for (i = 0; i < DIV_ROUND_UP(32, 16); i++)
+               writel_relaxed(ptr[i], dist_base + GIC_DIST_CONFIG + i * 4);
+
+       for (i = 0; i < DIV_ROUND_UP(32, 4); i++)
+               writel_relaxed(0xa0a0a0a0, dist_base + GIC_DIST_PRI + i * 4);
+
+       writel_relaxed(0xf0, cpu_base + GIC_CPU_PRIMASK);
+       writel_relaxed(1, cpu_base + GIC_CPU_CTRL);
+}
+
+static int gic_notifier(struct notifier_block *self, unsigned long cmd,        void *v)
+{
+       int i;
+
+       for (i = 0; i < MAX_GIC_NR; i++) {
+               switch (cmd) {
+               case CPU_PM_ENTER:
+                       gic_cpu_save(i);
+                       break;
+               case CPU_PM_ENTER_FAILED:
+               case CPU_PM_EXIT:
+                       gic_cpu_restore(i);
+                       break;
+               case CPU_CLUSTER_PM_ENTER:
+                       gic_dist_save(i);
+                       break;
+               case CPU_CLUSTER_PM_ENTER_FAILED:
+               case CPU_CLUSTER_PM_EXIT:
+                       gic_dist_restore(i);
+                       break;
+               }
+       }
+
+       return NOTIFY_OK;
+}
+
+static struct notifier_block gic_notifier_block = {
+       .notifier_call = gic_notifier,
+};
+
+static void __init gic_pm_init(struct gic_chip_data *gic)
+{
+       gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
+               sizeof(u32));
+       BUG_ON(!gic->saved_ppi_enable);
+
+       gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
+               sizeof(u32));
+       BUG_ON(!gic->saved_ppi_conf);
+
+       cpu_pm_register_notifier(&gic_notifier_block);
+}
+#else
+static void __init gic_pm_init(struct gic_chip_data *gic)
+{
+}
+#endif
+
 void __init gic_init(unsigned int gic_nr, unsigned int irq_start,
        void __iomem *dist_base, void __iomem *cpu_base)
 {
@@ -364,8 +581,10 @@ void __init gic_init(unsigned int gic_nr, unsigned int irq_start,
        if (gic_nr == 0)
                gic_cpu_base_addr = cpu_base;
 
+       gic_chip.flags |= gic_arch_extn.flags;
        gic_dist_init(gic, irq_start);
        gic_cpu_init(gic);
+       gic_pm_init(gic);
 }
 
 void __cpuinit gic_secondary_init(unsigned int gic_nr)
@@ -375,16 +594,6 @@ void __cpuinit gic_secondary_init(unsigned int gic_nr)
        gic_cpu_init(&gic_data[gic_nr]);
 }
 
-void __cpuinit gic_enable_ppi(unsigned int irq)
-{
-       unsigned long flags;
-
-       local_irq_save(flags);
-       irq_set_status_flags(irq, IRQ_NOPROBE);
-       gic_unmask_irq(irq_get_irq_data(irq));
-       local_irq_restore(flags);
-}
-
 #ifdef CONFIG_SMP
 void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 {