[ARM] tegra: add suspend and mirror irqs to legacy controller

mirror IRQ enable and disable operations on the legacy PPI system
interrupt controller, since the legacy controller is responsible
for responding to wakeup interrupts when the CPU is in LP2 idle mode

save the irq controller state on suspend and restore on resume
Signed-off-by: Gary King <gking@nvidia.com>

arch/arm/mach-tegra/include/mach/irqs.h

@@ -25,6 +25,7 @@
 
 #define IRQ_LOCALTIMER                  29
 
+#ifdef CONFIG_ARCH_TEGRA_2x_SOC
 /* Primary Interrupt Controller */
 #define INT_PRI_BASE			(INT_GIC_BASE + 32)
 #define INT_TMR1			(INT_PRI_BASE + 0)
@@ -169,5 +170,6 @@
 #define INT_GPIO_NR			(28 * 8)
 
 #define NR_IRQS				(INT_GPIO_BASE + INT_GPIO_NR)
+#endif
 
 #endif

arch/arm/mach-tegra/irq.c

@@ -4,6 +4,8 @@
  * Author:
  *	Colin Cross <ccross@google.com>
  *
+ * Copyright (C) 2010, NVIDIA Corporation
+ *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
@@ -27,8 +29,143 @@
 
 #include "board.h"
 
+#define INT_SYS_NR	(INT_GPIO_BASE - INT_PRI_BASE)
+#define INT_SYS_SZ	(INT_SEC_BASE - INT_PRI_BASE)
+#define PPI_NR		((INT_SYS_NR+INT_SYS_SZ-1)/INT_SYS_SZ)
+
+#define APBDMA_IRQ_STA_CPU  0x14
+#define APBDMA_IRQ_MASK_SET 0x20
+#define APBDMA_IRQ_MASK_CLR 0x24
+
+#define ICTLR_CPU_IER		0x20
+#define ICTLR_CPU_IER_SET	0x24
+#define ICTLR_CPU_IER_CLR	0x28
+#define ICTLR_CPU_IEP_CLASS	0x2c
+#define ICTLR_COP_IER		0x30
+#define ICTLR_COP_IER_SET	0x34
+#define ICTLR_COP_IER_CLR	0x38
+#define ICTLR_COP_IEP_CLASS	0x3c
+
+static void (*gic_mask_irq)(unsigned int irq);
+static void (*gic_unmask_irq)(unsigned int irq);
+
+#define irq_to_ictlr(irq) (((irq)-32) >> 5)
+static void __iomem *tegra_ictlr_base = IO_ADDRESS(TEGRA_PRIMARY_ICTLR_BASE);
+#define ictlr_to_virt(ictlr) (tegra_ictlr_base + (ictlr)*0x100)
+
+static void tegra_mask(unsigned int irq)
+{
+	void __iomem *addr = ictlr_to_virt(irq_to_ictlr(irq));
+	gic_mask_irq(irq);
+	writel(1<<(irq&31), addr+ICTLR_CPU_IER_CLR);
+}
+
+static void tegra_unmask(unsigned int irq)
+{
+	void __iomem *addr = ictlr_to_virt(irq_to_ictlr(irq));
+	gic_unmask_irq(irq);
+	writel(1<<(irq&31), addr+ICTLR_CPU_IER_SET);
+}
+
+#ifdef CONFIG_PM
+
+static int tegra_set_wake(unsigned int irq, unsigned int on)
+{
+	return 0;
+}
+#endif
+
+static struct irq_chip tegra_irq = {
+	.name		= "PPI",
+	.mask		= tegra_mask,
+	.unmask		= tegra_unmask,
+#ifdef CONFIG_PM
+	.set_wake	= tegra_set_wake,
+#endif
+};
+
 void __init tegra_init_irq(void)
 {
+	struct irq_chip *gic;
+	unsigned int i;
+
+	for (i = 0; i < PPI_NR; i++) {
+		writel(~0, ictlr_to_virt(i) + ICTLR_CPU_IER_CLR);
+		writel(0, ictlr_to_virt(i) + ICTLR_CPU_IEP_CLASS);
+	}
+
 	gic_dist_init(0, IO_ADDRESS(TEGRA_ARM_INT_DIST_BASE), 29);
 	gic_cpu_init(0, IO_ADDRESS(TEGRA_ARM_PERIF_BASE + 0x100));
+
+	gic = get_irq_chip(29);
+	gic_unmask_irq = gic->unmask;
+	gic_mask_irq = gic->mask;
+	tegra_irq.ack = gic->ack;
+#ifdef CONFIG_SMP
+	tegra_irq.set_affinity = gic->set_affinity;
+#endif
+
+	for (i = INT_PRI_BASE; i < INT_GPIO_BASE; i++) {
+		set_irq_chip(i, &tegra_irq);
+		set_irq_handler(i, handle_level_irq);
+		set_irq_flags(i, IRQF_VALID);
+	}
+}
+
+#ifdef CONFIG_PM
+static u32 cop_ier[PPI_NR];
+static u32 cpu_ier[PPI_NR];
+static u32 cpu_iep[PPI_NR];
+
+void tegra_irq_suspend(void)
+{
+	unsigned long flags;
+	int i;
+
+	for (i = INT_PRI_BASE; i < INT_GPIO_BASE; i++) {
+		struct irq_desc *desc = irq_to_desc(i);
+		if (!desc)
+			continue;
+		if (desc->status & IRQ_WAKEUP) {
+			pr_debug("irq %d is wakeup\n", i);
+			continue;
+		}
+		disable_irq(i);
+	}
+
+	local_irq_save(flags);
+	for (i = 0; i < PPI_NR; i++) {
+		void __iomem *ictlr = ictlr_to_virt(i);
+		cpu_ier[i] = readl(ictlr + ICTLR_CPU_IER);
+		cpu_iep[i] = readl(ictlr + ICTLR_CPU_IEP_CLASS);
+		cop_ier[i] = readl(ictlr + ICTLR_COP_IER);
+		writel(~0, ictlr + ICTLR_COP_IER_CLR);
+	}
+	local_irq_restore(flags);
+}
+
+void tegra_irq_resume(void)
+{
+	unsigned long flags;
+	int i;
+
+	local_irq_save(flags);
+	for (i = 0; i < PPI_NR; i++) {
+		void __iomem *ictlr = ictlr_to_virt(i);
+		writel(cpu_iep[i], ictlr + ICTLR_CPU_IEP_CLASS);
+		writel(~0ul, ictlr + ICTLR_CPU_IER_CLR);
+		writel(cpu_ier[i], ictlr + ICTLR_CPU_IER_SET);
+		writel(0, ictlr + ICTLR_COP_IEP_CLASS);
+		writel(~0ul, ictlr + ICTLR_COP_IER_CLR);
+		writel(cop_ier[i], ictlr + ICTLR_COP_IER_SET);
+	}
+	local_irq_restore(flags);
+
+	for (i = INT_PRI_BASE; i < INT_GPIO_BASE; i++) {
+		struct irq_desc *desc = irq_to_desc(i);
+		if (!desc || (desc->status & IRQ_WAKEUP))
+			continue;
+		enable_irq(i);
+	}
 }
+#endif