Merge Realview GIC code

5 files changed, 134 insertions, 22 deletions

diff --git a/arch/arm/common/gic.c b/arch/arm/common/gic.c
index 09b9d1b6844..4deece5fbdf 100644
--- a/arch/arm/common/gic.c
+++ b/arch/arm/common/gic.c
@@ -14,7 +14,9 @@
  *
  * o There is one CPU Interface per CPU, which sends interrupts sent
  *   by the Distributor, and interrupts generated locally, to the
- *   associated CPU.
+ *   associated CPU. The base address of the CPU interface is usually
+ *   aliased so that the same address points to different chips depending
+ *   on the CPU it is accessed from.
  *
  * Note that IRQs 0-31 are special - they are local to each CPU.
  * As such, the enable set/clear, pending set/clear and active bit
@@ -31,10 +33,38 @@
 #include <asm/mach/irq.h>
 #include <asm/hardware/gic.h>
 
-static void __iomem *gic_dist_base;
-static void __iomem *gic_cpu_base;
 static DEFINE_SPINLOCK(irq_controller_lock);
 
+struct gic_chip_data {
+	unsigned int irq_offset;
+	void __iomem *dist_base;
+	void __iomem *cpu_base;
+};
+
+#ifndef MAX_GIC_NR
+#define MAX_GIC_NR	1
+#endif
+
+static struct gic_chip_data gic_data[MAX_GIC_NR];
+
+static inline void __iomem *gic_dist_base(unsigned int irq)
+{
+	struct gic_chip_data *gic_data = get_irq_chip_data(irq);
+	return gic_data->dist_base;
+}
+
+static inline void __iomem *gic_cpu_base(unsigned int irq)
+{
+	struct gic_chip_data *gic_data = get_irq_chip_data(irq);
+	return gic_data->cpu_base;
+}
+
+static inline unsigned int gic_irq(unsigned int irq)
+{
+	struct gic_chip_data *gic_data = get_irq_chip_data(irq);
+	return irq - gic_data->irq_offset;
+}
+
 /*
  * Routines to acknowledge, disable and enable interrupts
  *
@@ -55,8 +85,8 @@ static void gic_ack_irq(unsigned int irq)
 	u32 mask = 1 << (irq % 32);
 
 	spin_lock(&irq_controller_lock);
-	writel(mask, gic_dist_base + GIC_DIST_ENABLE_CLEAR + (irq / 32) * 4);
-	writel(irq, gic_cpu_base + GIC_CPU_EOI);
+	writel(mask, gic_dist_base(irq) + GIC_DIST_ENABLE_CLEAR + (gic_irq(irq) / 32) * 4);
+	writel(gic_irq(irq), gic_cpu_base(irq) + GIC_CPU_EOI);
 	spin_unlock(&irq_controller_lock);
 }
 
@@ -65,7 +95,7 @@ static void gic_mask_irq(unsigned int irq)
 	u32 mask = 1 << (irq % 32);
 
 	spin_lock(&irq_controller_lock);
-	writel(mask, gic_dist_base + GIC_DIST_ENABLE_CLEAR + (irq / 32) * 4);
+	writel(mask, gic_dist_base(irq) + GIC_DIST_ENABLE_CLEAR + (gic_irq(irq) / 32) * 4);
 	spin_unlock(&irq_controller_lock);
 }
 
@@ -74,14 +104,14 @@ static void gic_unmask_irq(unsigned int irq)
 	u32 mask = 1 << (irq % 32);
 
 	spin_lock(&irq_controller_lock);
-	writel(mask, gic_dist_base + GIC_DIST_ENABLE_SET + (irq / 32) * 4);
+	writel(mask, gic_dist_base(irq) + GIC_DIST_ENABLE_SET + (gic_irq(irq) / 32) * 4);
 	spin_unlock(&irq_controller_lock);
 }
 
 #ifdef CONFIG_SMP
 static void gic_set_cpu(unsigned int irq, cpumask_t mask_val)
 {
-	void __iomem *reg = gic_dist_base + GIC_DIST_TARGET + (irq & ~3);
+	void __iomem *reg = gic_dist_base(irq) + GIC_DIST_TARGET + (gic_irq(irq) & ~3);
 	unsigned int shift = (irq % 4) * 8;
 	unsigned int cpu = first_cpu(mask_val);
 	u32 val;
@@ -95,6 +125,37 @@ static void gic_set_cpu(unsigned int irq, cpumask_t mask_val)
 }
 #endif
 
+static void fastcall gic_handle_cascade_irq(unsigned int irq,
+					    struct irq_desc *desc)
+{
+	struct gic_chip_data *chip_data = get_irq_data(irq);
+	struct irq_chip *chip = get_irq_chip(irq);
+	unsigned int cascade_irq;
+	unsigned long status;
+
+	/* primary controller ack'ing */
+	chip->ack(irq);
+
+	spin_lock(&irq_controller_lock);
+	status = readl(chip_data->cpu_base + GIC_CPU_INTACK);
+	spin_unlock(&irq_controller_lock);
+
+	cascade_irq = (status & 0x3ff);
+	if (cascade_irq > 1020)
+		goto out;
+	if (cascade_irq < 32 || cascade_irq >= NR_IRQS) {
+		do_bad_IRQ(cascade_irq, desc);
+		goto out;
+	}
+
+	cascade_irq += chip_data->irq_offset;
+	generic_handle_irq(cascade_irq);
+
+ out:
+	/* primary controller unmasking */
+	chip->unmask(irq);
+}
+
 static struct irq_chip gic_chip = {
 	.name		= "GIC",
 	.ack		= gic_ack_irq,
@@ -105,15 +166,29 @@ static struct irq_chip gic_chip = {
 #endif
 };
 
-void __init gic_dist_init(void __iomem *base)
+void __init gic_cascade_irq(unsigned int gic_nr, unsigned int irq)
+{
+	if (gic_nr >= MAX_GIC_NR)
+		BUG();
+	if (set_irq_data(irq, &gic_data[gic_nr]) != 0)
+		BUG();
+	set_irq_chained_handler(irq, gic_handle_cascade_irq);
+}
+
+void __init gic_dist_init(unsigned int gic_nr, void __iomem *base,
+			  unsigned int irq_start)
 {
 	unsigned int max_irq, i;
 	u32 cpumask = 1 << smp_processor_id();
 
+	if (gic_nr >= MAX_GIC_NR)
+		BUG();
+
 	cpumask |= cpumask << 8;
 	cpumask |= cpumask << 16;
 
-	gic_dist_base = base;
+	gic_data[gic_nr].dist_base = base;
+	gic_data[gic_nr].irq_offset = (irq_start - 1) & ~31;
 
 	writel(0, base + GIC_DIST_CTRL);
 
@@ -158,8 +233,9 @@ void __init gic_dist_init(void __iomem *base)
 	/*
 	 * Setup the Linux IRQ subsystem.
 	 */
-	for (i = 29; i < max_irq; i++) {
+	for (i = irq_start; i < gic_data[gic_nr].irq_offset + max_irq; i++) {
 		set_irq_chip(i, &gic_chip);
+		set_irq_chip_data(i, &gic_data[gic_nr]);
 		set_irq_handler(i, handle_level_irq);
 		set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
 	}
@@ -167,9 +243,13 @@ void __init gic_dist_init(void __iomem *base)
 	writel(1, base + GIC_DIST_CTRL);
 }
 
-void __cpuinit gic_cpu_init(void __iomem *base)
+void __cpuinit gic_cpu_init(unsigned int gic_nr, void __iomem *base)
 {
-	gic_cpu_base = base;
+	if (gic_nr >= MAX_GIC_NR)
+		BUG();
+
+	gic_data[gic_nr].cpu_base = base;
+
 	writel(0xf0, base + GIC_CPU_PRIMASK);
 	writel(1, base + GIC_CPU_CTRL);
 }
@@ -179,6 +259,7 @@ void gic_raise_softirq(cpumask_t cpumask, unsigned int irq)
 {
 	unsigned long map = *cpus_addr(cpumask);
 
-	writel(map << 16 | irq, gic_dist_base + GIC_DIST_SOFTINT);
+	/* this always happens on GIC0 */
+	writel(map << 16 | irq, gic_data[0].dist_base + GIC_DIST_SOFTINT);
 }
 #endif
diff --git a/arch/arm/mach-realview/Kconfig b/arch/arm/mach-realview/Kconfig
index 17f5f4439fe..68bc6b226ec 100644
--- a/arch/arm/mach-realview/Kconfig
+++ b/arch/arm/mach-realview/Kconfig
@@ -16,4 +16,14 @@ config REALVIEW_MPCORE
 	  kernel built with this option enabled is not compatible with
 	  other tiles.
 
+config REALVIEW_MPCORE_REVB
+	bool "Support MPcore RevB tile"
+	depends on REALVIEW_MPCORE
+	default n
+	help
+	  Enable support for the MPCore RevB tile on the Realview platform.
+	  Since there are device address differences, a
+	  kernel built with this option enabled is not compatible with
+	  other tiles.
+
 endmenu
diff --git a/arch/arm/mach-realview/platsmp.c b/arch/arm/mach-realview/platsmp.c
index b8484e15dac..709a9b1ac63 100644
--- a/arch/arm/mach-realview/platsmp.c
+++ b/arch/arm/mach-realview/platsmp.c
@@ -52,7 +52,7 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
 	 * core (e.g. timer irq), then they will not have been enabled
 	 * for us: do so
 	 */
-	gic_cpu_init(__io_address(REALVIEW_GIC_CPU_BASE));
+	gic_cpu_init(0, __io_address(REALVIEW_GIC_CPU_BASE));
 
 	/*
 	 * let the primary processor know we're out of the
diff --git a/arch/arm/mach-realview/realview_eb.c b/arch/arm/mach-realview/realview_eb.c
index 9741b4d3c9c..effe243454e 100644
--- a/arch/arm/mach-realview/realview_eb.c
+++ b/arch/arm/mach-realview/realview_eb.c
@@ -57,7 +57,21 @@ static struct map_desc realview_eb_io_desc[] __initdata = {
 		.pfn		= __phys_to_pfn(REALVIEW_GIC_DIST_BASE),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
+	},
+#ifdef CONFIG_REALVIEW_MPCORE
+	{
+		.virtual	= IO_ADDRESS(REALVIEW_GIC1_CPU_BASE),
+		.pfn		= __phys_to_pfn(REALVIEW_GIC1_CPU_BASE),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
 	}, {
+		.virtual	= IO_ADDRESS(REALVIEW_GIC1_DIST_BASE),
+		.pfn		= __phys_to_pfn(REALVIEW_GIC1_DIST_BASE),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	},
+#endif
+	{
 		.virtual	= IO_ADDRESS(REALVIEW_SCTL_BASE),
 		.pfn		= __phys_to_pfn(REALVIEW_SCTL_BASE),
 		.length		= SZ_4K,
@@ -138,13 +152,18 @@ static void __init gic_init_irq(void)
 #ifdef CONFIG_REALVIEW_MPCORE
 	unsigned int pldctrl;
 	writel(0x0000a05f, __io_address(REALVIEW_SYS_LOCK));
-	pldctrl = readl(__io_address(REALVIEW_SYS_BASE)	+ 0xd8);
+	pldctrl = readl(__io_address(REALVIEW_SYS_BASE)	+ REALVIEW_MPCORE_SYS_PLD_CTRL1);
 	pldctrl |= 0x00800000;	/* New irq mode */
-	writel(pldctrl, __io_address(REALVIEW_SYS_BASE) + 0xd8);
+	writel(pldctrl, __io_address(REALVIEW_SYS_BASE) + REALVIEW_MPCORE_SYS_PLD_CTRL1);
 	writel(0x00000000, __io_address(REALVIEW_SYS_LOCK));
 #endif
-	gic_dist_init(__io_address(REALVIEW_GIC_DIST_BASE));
-	gic_cpu_init(__io_address(REALVIEW_GIC_CPU_BASE));
+	gic_dist_init(0, __io_address(REALVIEW_GIC_DIST_BASE), 29);
+	gic_cpu_init(0, __io_address(REALVIEW_GIC_CPU_BASE));
+#ifdef CONFIG_REALVIEW_MPCORE
+	gic_dist_init(1, __io_address(REALVIEW_GIC1_DIST_BASE), 64);
+	gic_cpu_init(1, __io_address(REALVIEW_GIC1_CPU_BASE));
+	gic_cascade_irq(1, IRQ_EB_IRQ1);
+#endif
 }
 
 static void __init realview_eb_init(void)
diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index d78c0ae7c2c..eb42e5b9486 100644
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -14,10 +14,13 @@
 #include <asm/assembler.h>
 #include <asm/asm-offsets.h>
 #include <asm/elf.h>
-#include <asm/hardware/arm_scu.h>
 #include <asm/pgtable-hwdef.h>
 #include <asm/pgtable.h>
 
+#ifdef CONFIG_SMP
+#include <asm/hardware/arm_scu.h>
+#endif
+
 #include "proc-macros.S"
 
 #define D_CACHE_LINE_SIZE	32
@@ -187,8 +190,7 @@ __v6_setup:
 	/* Set up the SCU on core 0 only */
 	mrc	p15, 0, r0, c0, c0, 5		@ CPU core number
 	ands	r0, r0, #15
-	moveq	r0, #0x10000000 @ SCU_BASE
-	orreq	r0, r0, #0x00100000
+	ldreq	r0, =SCU_BASE
 	ldreq	r5, [r0, #SCU_CTRL]
 	orreq	r5, r5, #1
 	streq	r5, [r0, #SCU_CTRL]