Merge branch 'devel-stable' into for-linus

Conflicts:
	arch/arm/kernel/setup.c
	arch/arm/mach-shmobile/board-kota2.c

3 files changed, 265 insertions, 54 deletions

diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index 74df9ca2be31..81a933eb0903 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -1,8 +1,14 @@
 config ARM_GIC
 	select IRQ_DOMAIN
+	select MULTI_IRQ_HANDLER
+	bool
+
+config GIC_NON_BANKED
 	bool
 
 config ARM_VIC
+	select IRQ_DOMAIN
+	select MULTI_IRQ_HANDLER
 	bool
 
 config ARM_VIC_NR
diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 410a546060a2..b2dc2dd7f1df 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -40,13 +40,36 @@
 #include <linux/slab.h>
 
 #include <asm/irq.h>
+#include <asm/exception.h>
 #include <asm/mach/irq.h>
 #include <asm/hardware/gic.h>
 
-static DEFINE_RAW_SPINLOCK(irq_controller_lock);
+union gic_base {
+	void __iomem *common_base;
+	void __percpu __iomem **percpu_base;
+};
 
-/* Address of GIC 0 CPU interface */
-void __iomem *gic_cpu_base_addr __read_mostly;
+struct gic_chip_data {
+	unsigned int irq_offset;
+	union gic_base dist_base;
+	union gic_base cpu_base;
+#ifdef CONFIG_CPU_PM
+	u32 saved_spi_enable[DIV_ROUND_UP(1020, 32)];
+	u32 saved_spi_conf[DIV_ROUND_UP(1020, 16)];
+	u32 saved_spi_target[DIV_ROUND_UP(1020, 4)];
+	u32 __percpu *saved_ppi_enable;
+	u32 __percpu *saved_ppi_conf;
+#endif
+#ifdef CONFIG_IRQ_DOMAIN
+	struct irq_domain domain;
+#endif
+	unsigned int gic_irqs;
+#ifdef CONFIG_GIC_NON_BANKED
+	void __iomem *(*get_base)(union gic_base *);
+#endif
+};
+
+static DEFINE_RAW_SPINLOCK(irq_controller_lock);
 
 /*
  * Supported arch specific GIC irq extension.
@@ -67,16 +90,48 @@ struct irq_chip gic_arch_extn = {
 
 static struct gic_chip_data gic_data[MAX_GIC_NR] __read_mostly;
 
+#ifdef CONFIG_GIC_NON_BANKED
+static void __iomem *gic_get_percpu_base(union gic_base *base)
+{
+	return *__this_cpu_ptr(base->percpu_base);
+}
+
+static void __iomem *gic_get_common_base(union gic_base *base)
+{
+	return base->common_base;
+}
+
+static inline void __iomem *gic_data_dist_base(struct gic_chip_data *data)
+{
+	return data->get_base(&data->dist_base);
+}
+
+static inline void __iomem *gic_data_cpu_base(struct gic_chip_data *data)
+{
+	return data->get_base(&data->cpu_base);
+}
+
+static inline void gic_set_base_accessor(struct gic_chip_data *data,
+					 void __iomem *(*f)(union gic_base *))
+{
+	data->get_base = f;
+}
+#else
+#define gic_data_dist_base(d)	((d)->dist_base.common_base)
+#define gic_data_cpu_base(d)	((d)->cpu_base.common_base)
+#define gic_set_base_accessor(d,f)
+#endif
+
 static inline void __iomem *gic_dist_base(struct irq_data *d)
 {
 	struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
-	return gic_data->dist_base;
+	return gic_data_dist_base(gic_data);
 }
 
 static inline void __iomem *gic_cpu_base(struct irq_data *d)
 {
 	struct gic_chip_data *gic_data = irq_data_get_irq_chip_data(d);
-	return gic_data->cpu_base;
+	return gic_data_cpu_base(gic_data);
 }
 
 static inline unsigned int gic_irq(struct irq_data *d)
@@ -215,6 +270,32 @@ static int gic_set_wake(struct irq_data *d, unsigned int on)
 #define gic_set_wake	NULL
 #endif
 
+asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
+{
+	u32 irqstat, irqnr;
+	struct gic_chip_data *gic = &gic_data[0];
+	void __iomem *cpu_base = gic_data_cpu_base(gic);
+
+	do {
+		irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
+		irqnr = irqstat & ~0x1c00;
+
+		if (likely(irqnr > 15 && irqnr < 1021)) {
+			irqnr = irq_domain_to_irq(&gic->domain, irqnr);
+			handle_IRQ(irqnr, regs);
+			continue;
+		}
+		if (irqnr < 16) {
+			writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
+#ifdef CONFIG_SMP
+			handle_IPI(irqnr, regs);
+#endif
+			continue;
+		}
+		break;
+	} while (1);
+}
+
 static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
 {
 	struct gic_chip_data *chip_data = irq_get_handler_data(irq);
@@ -225,7 +306,7 @@ static void gic_handle_cascade_irq(unsigned int irq, struct irq_desc *desc)
 	chained_irq_enter(chip, desc);
 
 	raw_spin_lock(&irq_controller_lock);
-	status = readl_relaxed(chip_data->cpu_base + GIC_CPU_INTACK);
+	status = readl_relaxed(gic_data_cpu_base(chip_data) + GIC_CPU_INTACK);
 	raw_spin_unlock(&irq_controller_lock);
 
 	gic_irq = (status & 0x3ff);
@@ -270,7 +351,7 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
 	u32 cpumask;
 	unsigned int gic_irqs = gic->gic_irqs;
 	struct irq_domain *domain = &gic->domain;
-	void __iomem *base = gic->dist_base;
+	void __iomem *base = gic_data_dist_base(gic);
 	u32 cpu = 0;
 
 #ifdef CONFIG_SMP
@@ -330,8 +411,8 @@ static void __init gic_dist_init(struct gic_chip_data *gic)
 
 static void __cpuinit gic_cpu_init(struct gic_chip_data *gic)
 {
-	void __iomem *dist_base = gic->dist_base;
-	void __iomem *base = gic->cpu_base;
+	void __iomem *dist_base = gic_data_dist_base(gic);
+	void __iomem *base = gic_data_cpu_base(gic);
 	int i;
 
 	/*
@@ -368,7 +449,7 @@ static void gic_dist_save(unsigned int gic_nr)
 		BUG();
 
 	gic_irqs = gic_data[gic_nr].gic_irqs;
-	dist_base = gic_data[gic_nr].dist_base;
+	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
 
 	if (!dist_base)
 		return;
@@ -403,7 +484,7 @@ static void gic_dist_restore(unsigned int gic_nr)
 		BUG();
 
 	gic_irqs = gic_data[gic_nr].gic_irqs;
-	dist_base = gic_data[gic_nr].dist_base;
+	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
 
 	if (!dist_base)
 		return;
@@ -439,8 +520,8 @@ static void gic_cpu_save(unsigned int gic_nr)
 	if (gic_nr >= MAX_GIC_NR)
 		BUG();
 
-	dist_base = gic_data[gic_nr].dist_base;
-	cpu_base = gic_data[gic_nr].cpu_base;
+	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+	cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 
 	if (!dist_base || !cpu_base)
 		return;
@@ -465,8 +546,8 @@ static void gic_cpu_restore(unsigned int gic_nr)
 	if (gic_nr >= MAX_GIC_NR)
 		BUG();
 
-	dist_base = gic_data[gic_nr].dist_base;
-	cpu_base = gic_data[gic_nr].cpu_base;
+	dist_base = gic_data_dist_base(&gic_data[gic_nr]);
+	cpu_base = gic_data_cpu_base(&gic_data[gic_nr]);
 
 	if (!dist_base || !cpu_base)
 		return;
@@ -491,6 +572,11 @@ static int gic_notifier(struct notifier_block *self, unsigned long cmd,	void *v)
 	int i;
 
 	for (i = 0; i < MAX_GIC_NR; i++) {
+#ifdef CONFIG_GIC_NON_BANKED
+		/* Skip over unused GICs */
+		if (!gic_data[i].get_base)
+			continue;
+#endif
 		switch (cmd) {
 		case CPU_PM_ENTER:
 			gic_cpu_save(i);
@@ -564,8 +650,9 @@ const struct irq_domain_ops gic_irq_domain_ops = {
 #endif
 };
 
-void __init gic_init(unsigned int gic_nr, int irq_start,
-	void __iomem *dist_base, void __iomem *cpu_base)
+void __init gic_init_bases(unsigned int gic_nr, int irq_start,
+			   void __iomem *dist_base, void __iomem *cpu_base,
+			   u32 percpu_offset)
 {
 	struct gic_chip_data *gic;
 	struct irq_domain *domain;
@@ -575,8 +662,36 @@ void __init gic_init(unsigned int gic_nr, int irq_start,
 
 	gic = &gic_data[gic_nr];
 	domain = &gic->domain;
-	gic->dist_base = dist_base;
-	gic->cpu_base = cpu_base;
+#ifdef CONFIG_GIC_NON_BANKED
+	if (percpu_offset) { /* Frankein-GIC without banked registers... */
+		unsigned int cpu;
+
+		gic->dist_base.percpu_base = alloc_percpu(void __iomem *);
+		gic->cpu_base.percpu_base = alloc_percpu(void __iomem *);
+		if (WARN_ON(!gic->dist_base.percpu_base ||
+			    !gic->cpu_base.percpu_base)) {
+			free_percpu(gic->dist_base.percpu_base);
+			free_percpu(gic->cpu_base.percpu_base);
+			return;
+		}
+
+		for_each_possible_cpu(cpu) {
+			unsigned long offset = percpu_offset * cpu_logical_map(cpu);
+			*per_cpu_ptr(gic->dist_base.percpu_base, cpu) = dist_base + offset;
+			*per_cpu_ptr(gic->cpu_base.percpu_base, cpu) = cpu_base + offset;
+		}
+
+		gic_set_base_accessor(gic, gic_get_percpu_base);
+	} else
+#endif
+	{			/* Normal, sane GIC... */
+		WARN(percpu_offset,
+		     "GIC_NON_BANKED not enabled, ignoring %08x offset!",
+		     percpu_offset);
+		gic->dist_base.common_base = dist_base;
+		gic->cpu_base.common_base = cpu_base;
+		gic_set_base_accessor(gic, gic_get_common_base);
+	}
 
 	/*
 	 * For primary GICs, skip over SGIs.
@@ -584,8 +699,6 @@ void __init gic_init(unsigned int gic_nr, int irq_start,
 	 */
 	domain->hwirq_base = 32;
 	if (gic_nr == 0) {
-		gic_cpu_base_addr = cpu_base;
-
 		if ((irq_start & 31) > 0) {
 			domain->hwirq_base = 16;
 			if (irq_start != -1)
@@ -597,7 +710,7 @@ void __init gic_init(unsigned int gic_nr, int irq_start,
 	 * Find out how many interrupts are supported.
 	 * The GIC only supports up to 1020 interrupt sources.
 	 */
-	gic_irqs = readl_relaxed(dist_base + GIC_DIST_CTR) & 0x1f;
+	gic_irqs = readl_relaxed(gic_data_dist_base(gic) + GIC_DIST_CTR) & 0x1f;
 	gic_irqs = (gic_irqs + 1) * 32;
 	if (gic_irqs > 1020)
 		gic_irqs = 1020;
@@ -645,7 +758,7 @@ void gic_raise_softirq(const struct cpumask *mask, unsigned int irq)
 	dsb();
 
 	/* this always happens on GIC0 */
-	writel_relaxed(map << 16 | irq, gic_data[0].dist_base + GIC_DIST_SOFTINT);
+	writel_relaxed(map << 16 | irq, gic_data_dist_base(&gic_data[0]) + GIC_DIST_SOFTINT);
 }
 #endif
 
@@ -656,6 +769,7 @@ int __init gic_of_init(struct device_node *node, struct device_node *parent)
 {
 	void __iomem *cpu_base;
 	void __iomem *dist_base;
+	u32 percpu_offset;
 	int irq;
 	struct irq_domain *domain = &gic_data[gic_cnt].domain;
 
@@ -668,9 +782,12 @@ int __init gic_of_init(struct device_node *node, struct device_node *parent)
 	cpu_base = of_iomap(node, 1);
 	WARN(!cpu_base, "unable to map gic cpu registers\n");
 
+	if (of_property_read_u32(node, "cpu-offset", &percpu_offset))
+		percpu_offset = 0;
+
 	domain->of_node = of_node_get(node);
 
-	gic_init(gic_cnt, -1, dist_base, cpu_base);
+	gic_init_bases(gic_cnt, -1, dist_base, cpu_base, percpu_offset);
 
 	if (parent) {
 		irq = irq_of_parse_and_map(node, 0);
diff --git a/arch/arm/common/vic.c b/arch/arm/common/vic.c
index 01f18a421b17..dcb004a804c7 100644
--- a/arch/arm/common/vic.c
+++ b/arch/arm/common/vic.c
@@ -19,17 +19,22 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#include <linux/export.h>
 #include <linux/init.h>
 #include <linux/list.h>
 #include <linux/io.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/syscore_ops.h>
 #include <linux/device.h>
 #include <linux/amba/bus.h>
 
+#include <asm/exception.h>
 #include <asm/mach/irq.h>
 #include <asm/hardware/vic.h>
 
-#ifdef CONFIG_PM
 /**
  * struct vic_device - VIC PM device
  * @irq: The IRQ number for the base of the VIC.
@@ -40,6 +45,7 @@
  * @int_enable: Save for VIC_INT_ENABLE.
  * @soft_int: Save for VIC_INT_SOFT.
  * @protect: Save for VIC_PROTECT.
+ * @domain: The IRQ domain for the VIC.
  */
 struct vic_device {
 	void __iomem	*base;
@@ -50,13 +56,13 @@ struct vic_device {
 	u32		int_enable;
 	u32		soft_int;
 	u32		protect;
+	struct irq_domain domain;
 };
 
 /* we cannot allocate memory when VICs are initially registered */
 static struct vic_device vic_devices[CONFIG_ARM_VIC_NR];
 
 static int vic_id;
-#endif /* CONFIG_PM */
 
 /**
  * vic_init2 - common initialisation code
@@ -156,39 +162,50 @@ static int __init vic_pm_init(void)
 	return 0;
 }
 late_initcall(vic_pm_init);
+#endif /* CONFIG_PM */
 
 /**
- * vic_pm_register - Register a VIC for later power management control
+ * vic_register() - Register a VIC.
  * @base: The base address of the VIC.
  * @irq: The base IRQ for the VIC.
  * @resume_sources: bitmask of interrupts allowed for resume sources.
+ * @node: The device tree node associated with the VIC.
  *
  * Register the VIC with the system device tree so that it can be notified
  * of suspend and resume requests and ensure that the correct actions are
  * taken to re-instate the settings on resume.
+ *
+ * This also configures the IRQ domain for the VIC.
  */
-static void __init vic_pm_register(void __iomem *base, unsigned int irq, u32 resume_sources)
+static void __init vic_register(void __iomem *base, unsigned int irq,
+				u32 resume_sources, struct device_node *node)
 {
 	struct vic_device *v;
 
-	if (vic_id >= ARRAY_SIZE(vic_devices))
+	if (vic_id >= ARRAY_SIZE(vic_devices)) {
 		printk(KERN_ERR "%s: too few VICs, increase CONFIG_ARM_VIC_NR\n", __func__);
-	else {
-		v = &vic_devices[vic_id];
-		v->base = base;
-		v->resume_sources = resume_sources;
-		v->irq = irq;
-		vic_id++;
+		return;
 	}
+
+	v = &vic_devices[vic_id];
+	v->base = base;
+	v->resume_sources = resume_sources;
+	v->irq = irq;
+	vic_id++;
+
+	v->domain.irq_base = irq;
+	v->domain.nr_irq = 32;
+#ifdef CONFIG_OF_IRQ
+	v->domain.of_node = of_node_get(node);
+#endif /* CONFIG_OF */
+	v->domain.ops = &irq_domain_simple_ops;
+	irq_domain_add(&v->domain);
 }
-#else
-static inline void vic_pm_register(void __iomem *base, unsigned int irq, u32 arg1) { }
-#endif /* CONFIG_PM */
 
 static void vic_ack_irq(struct irq_data *d)
 {
 	void __iomem *base = irq_data_get_irq_chip_data(d);
-	unsigned int irq = d->irq & 31;
+	unsigned int irq = d->hwirq;
 	writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
 	/* moreover, clear the soft-triggered, in case it was the reason */
 	writel(1 << irq, base + VIC_INT_SOFT_CLEAR);
@@ -197,14 +214,14 @@ static void vic_ack_irq(struct irq_data *d)
 static void vic_mask_irq(struct irq_data *d)
 {
 	void __iomem *base = irq_data_get_irq_chip_data(d);
-	unsigned int irq = d->irq & 31;
+	unsigned int irq = d->hwirq;
 	writel(1 << irq, base + VIC_INT_ENABLE_CLEAR);
 }
 
 static void vic_unmask_irq(struct irq_data *d)
 {
 	void __iomem *base = irq_data_get_irq_chip_data(d);
-	unsigned int irq = d->irq & 31;
+	unsigned int irq = d->hwirq;
 	writel(1 << irq, base + VIC_INT_ENABLE);
 }
 
@@ -226,7 +243,7 @@ static struct vic_device *vic_from_irq(unsigned int irq)
 static int vic_set_wake(struct irq_data *d, unsigned int on)
 {
 	struct vic_device *v = vic_from_irq(d->irq);
-	unsigned int off = d->irq & 31;
+	unsigned int off = d->hwirq;
 	u32 bit = 1 << off;
 
 	if (!v)
@@ -301,7 +318,7 @@ static void __init vic_set_irq_sources(void __iomem *base,
  *  and 020 within the page. We call this "second block".
  */
 static void __init vic_init_st(void __iomem *base, unsigned int irq_start,
-				u32 vic_sources)
+			       u32 vic_sources, struct device_node *node)
 {
 	unsigned int i;
 	int vic_2nd_block = ((unsigned long)base & ~PAGE_MASK) != 0;
@@ -328,17 +345,12 @@ static void __init vic_init_st(void __iomem *base, unsigned int irq_start,
 	}
 
 	vic_set_irq_sources(base, irq_start, vic_sources);
+	vic_register(base, irq_start, 0, node);
 }
 
-/**
- * vic_init - initialise a vectored interrupt controller
- * @base: iomem base address
- * @irq_start: starting interrupt number, must be muliple of 32
- * @vic_sources: bitmask of interrupt sources to allow
- * @resume_sources: bitmask of interrupt sources to allow for resume
- */
-void __init vic_init(void __iomem *base, unsigned int irq_start,
-		     u32 vic_sources, u32 resume_sources)
+static void __init __vic_init(void __iomem *base, unsigned int irq_start,
+			      u32 vic_sources, u32 resume_sources,
+			      struct device_node *node)
 {
 	unsigned int i;
 	u32 cellid = 0;
@@ -356,7 +368,7 @@ void __init vic_init(void __iomem *base, unsigned int irq_start,
 
 	switch(vendor) {
 	case AMBA_VENDOR_ST:
-		vic_init_st(base, irq_start, vic_sources);
+		vic_init_st(base, irq_start, vic_sources, node);
 		return;
 	default:
 		printk(KERN_WARNING "VIC: unknown vendor, continuing anyways\n");
@@ -375,5 +387,81 @@ void __init vic_init(void __iomem *base, unsigned int irq_start,
 
 	vic_set_irq_sources(base, irq_start, vic_sources);
 
-	vic_pm_register(base, irq_start, resume_sources);
+	vic_register(base, irq_start, resume_sources, node);
+}
+
+/**
+ * vic_init() - initialise a vectored interrupt controller
+ * @base: iomem base address
+ * @irq_start: starting interrupt number, must be muliple of 32
+ * @vic_sources: bitmask of interrupt sources to allow
+ * @resume_sources: bitmask of interrupt sources to allow for resume
+ */
+void __init vic_init(void __iomem *base, unsigned int irq_start,
+		     u32 vic_sources, u32 resume_sources)
+{
+	__vic_init(base, irq_start, vic_sources, resume_sources, NULL);
+}
+
+#ifdef CONFIG_OF
+int __init vic_of_init(struct device_node *node, struct device_node *parent)
+{
+	void __iomem *regs;
+	int irq_base;
+
+	if (WARN(parent, "non-root VICs are not supported"))
+		return -EINVAL;
+
+	regs = of_iomap(node, 0);
+	if (WARN_ON(!regs))
+		return -EIO;
+
+	irq_base = irq_alloc_descs(-1, 0, 32, numa_node_id());
+	if (WARN_ON(irq_base < 0))
+		goto out_unmap;
+
+	__vic_init(regs, irq_base, ~0, ~0, node);
+
+	return 0;
+
+ out_unmap:
+	iounmap(regs);
+
+	return -EIO;
+}
+#endif /* CONFIG OF */
+
+/*
+ * Handle each interrupt in a single VIC.  Returns non-zero if we've
+ * handled at least one interrupt.  This does a single read of the
+ * status register and handles all interrupts in order from LSB first.
+ */
+static int handle_one_vic(struct vic_device *vic, struct pt_regs *regs)
+{
+	u32 stat, irq;
+	int handled = 0;
+
+	stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);
+	while (stat) {
+		irq = ffs(stat) - 1;
+		handle_IRQ(irq_domain_to_irq(&vic->domain, irq), regs);
+		stat &= ~(1 << irq);
+		handled = 1;
+	}
+
+	return handled;
+}
+
+/*
+ * Keep iterating over all registered VIC's until there are no pending
+ * interrupts.
+ */
+asmlinkage void __exception_irq_entry vic_handle_irq(struct pt_regs *regs)
+{
+	int i, handled;
+
+	do {
+		for (i = 0, handled = 0; i < vic_id; ++i)
+			handled |= handle_one_vic(&vic_devices[i], regs);
+	} while (handled);
 }