initial_commit

1 files changed, 256 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/irq.c b/arch/arm/mach-omap2/irq.c
new file mode 100644
index 00000000..3af2b7a1
--- /dev/null
+++ b/arch/arm/mach-omap2/irq.c
@@ -0,0 +1,256 @@
+/*
+ * linux/arch/arm/mach-omap2/irq.c
+ *
+ * Interrupt handler for OMAP2 boards.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Paul Mundt <paul.mundt@nokia.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <mach/hardware.h>
+#include <asm/mach/irq.h>
+
+
+/* selected INTC register offsets */
+
+#define INTC_REVISION		0x0000
+#define INTC_SYSCONFIG		0x0010
+#define INTC_SYSSTATUS		0x0014
+#define INTC_SIR		0x0040
+#define INTC_CONTROL		0x0048
+#define INTC_PROTECTION		0x004C
+#define INTC_IDLE		0x0050
+#define INTC_THRESHOLD		0x0068
+#define INTC_MIR0		0x0084
+#define INTC_MIR_CLEAR0		0x0088
+#define INTC_MIR_SET0		0x008c
+#define INTC_PENDING_IRQ0	0x0098
+/* Number of IRQ state bits in each MIR register */
+#define IRQ_BITS_PER_REG	32
+
+/*
+ * OMAP2 has a number of different interrupt controllers, each interrupt
+ * controller is identified as its own "bank". Register definitions are
+ * fairly consistent for each bank, but not all registers are implemented
+ * for each bank.. when in doubt, consult the TRM.
+ */
+static struct omap_irq_bank {
+	void __iomem *base_reg;
+	unsigned int nr_irqs;
+} __attribute__ ((aligned(4))) irq_banks[] = {
+	{
+		/* MPU INTC */
+		.nr_irqs	= 96,
+	},
+};
+
+/* Structure to save interrupt controller context */
+struct omap3_intc_regs {
+	u32 sysconfig;
+	u32 protection;
+	u32 idle;
+	u32 threshold;
+	u32 ilr[INTCPS_NR_IRQS];
+	u32 mir[INTCPS_NR_MIR_REGS];
+};
+
+/* INTC bank register get/set */
+
+static void intc_bank_write_reg(u32 val, struct omap_irq_bank *bank, u16 reg)
+{
+	__raw_writel(val, bank->base_reg + reg);
+}
+
+static u32 intc_bank_read_reg(struct omap_irq_bank *bank, u16 reg)
+{
+	return __raw_readl(bank->base_reg + reg);
+}
+
+/* XXX: FIQ and additional INTC support (only MPU at the moment) */
+static void omap_ack_irq(struct irq_data *d)
+{
+	intc_bank_write_reg(0x1, &irq_banks[0], INTC_CONTROL);
+}
+
+static void omap_mask_ack_irq(struct irq_data *d)
+{
+	irq_gc_mask_disable_reg(d);
+	omap_ack_irq(d);
+}
+
+static void __init omap_irq_bank_init_one(struct omap_irq_bank *bank)
+{
+	unsigned long tmp;
+
+	tmp = intc_bank_read_reg(bank, INTC_REVISION) & 0xff;
+	printk(KERN_INFO "IRQ: Found an INTC at 0x%p "
+			 "(revision %ld.%ld) with %d interrupts\n",
+			 bank->base_reg, tmp >> 4, tmp & 0xf, bank->nr_irqs);
+
+	tmp = intc_bank_read_reg(bank, INTC_SYSCONFIG);
+	tmp |= 1 << 1;	/* soft reset */
+	intc_bank_write_reg(tmp, bank, INTC_SYSCONFIG);
+
+	while (!(intc_bank_read_reg(bank, INTC_SYSSTATUS) & 0x1))
+		/* Wait for reset to complete */;
+
+	/* Enable autoidle */
+	intc_bank_write_reg(1 << 0, bank, INTC_SYSCONFIG);
+}
+
+int omap_irq_pending(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
+		struct omap_irq_bank *bank = irq_banks + i;
+		int irq;
+
+		for (irq = 0; irq < bank->nr_irqs; irq += 32)
+			if (intc_bank_read_reg(bank, INTC_PENDING_IRQ0 +
+					       ((irq >> 5) << 5)))
+				return 1;
+	}
+	return 0;
+}
+
+static __init void
+omap_alloc_gc(void __iomem *base, unsigned int irq_start, unsigned int num)
+{
+	struct irq_chip_generic *gc;
+	struct irq_chip_type *ct;
+
+	gc = irq_alloc_generic_chip("INTC", 1, irq_start, base,
+					handle_level_irq);
+	ct = gc->chip_types;
+	ct->chip.irq_ack = omap_mask_ack_irq;
+	ct->chip.irq_mask = irq_gc_mask_disable_reg;
+	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
+
+	ct->regs.ack = INTC_CONTROL;
+	ct->regs.enable = INTC_MIR_CLEAR0;
+	ct->regs.disable = INTC_MIR_SET0;
+	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
+				IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+}
+
+void __init omap_init_irq(void)
+{
+	unsigned long nr_of_irqs = 0;
+	unsigned int nr_banks = 0;
+	int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(irq_banks); i++) {
+		unsigned long base = 0;
+		struct omap_irq_bank *bank = irq_banks + i;
+
+		if (cpu_is_omap24xx())
+			base = OMAP24XX_IC_BASE;
+		else if (cpu_is_omap34xx())
+			base = OMAP34XX_IC_BASE;
+
+		BUG_ON(!base);
+
+		if (cpu_is_ti816x())
+			bank->nr_irqs = 128;
+
+		/* Static mapping, never released */
+		bank->base_reg = ioremap(base, SZ_4K);
+		if (!bank->base_reg) {
+			printk(KERN_ERR "Could not ioremap irq bank%i\n", i);
+			continue;
+		}
+
+		omap_irq_bank_init_one(bank);
+
+		for (i = 0, j = 0; i < bank->nr_irqs; i += 32, j += 0x20)
+			omap_alloc_gc(bank->base_reg + j, i, 32);
+
+		nr_of_irqs += bank->nr_irqs;
+		nr_banks++;
+	}
+
+	printk(KERN_INFO "Total of %ld interrupts on %d active controller%s\n",
+	       nr_of_irqs, nr_banks, nr_banks > 1 ? "s" : "");
+}
+
+#ifdef CONFIG_ARCH_OMAP3
+static struct omap3_intc_regs intc_context[ARRAY_SIZE(irq_banks)];
+
+void omap_intc_save_context(void)
+{
+	int ind = 0, i = 0;
+	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
+		struct omap_irq_bank *bank = irq_banks + ind;
+		intc_context[ind].sysconfig =
+			intc_bank_read_reg(bank, INTC_SYSCONFIG);
+		intc_context[ind].protection =
+			intc_bank_read_reg(bank, INTC_PROTECTION);
+		intc_context[ind].idle =
+			intc_bank_read_reg(bank, INTC_IDLE);
+		intc_context[ind].threshold =
+			intc_bank_read_reg(bank, INTC_THRESHOLD);
+		for (i = 0; i < INTCPS_NR_IRQS; i++)
+			intc_context[ind].ilr[i] =
+				intc_bank_read_reg(bank, (0x100 + 0x4*i));
+		for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
+			intc_context[ind].mir[i] =
+				intc_bank_read_reg(&irq_banks[0], INTC_MIR0 +
+				(0x20 * i));
+	}
+}
+
+void omap_intc_restore_context(void)
+{
+	int ind = 0, i = 0;
+
+	for (ind = 0; ind < ARRAY_SIZE(irq_banks); ind++) {
+		struct omap_irq_bank *bank = irq_banks + ind;
+		intc_bank_write_reg(intc_context[ind].sysconfig,
+					bank, INTC_SYSCONFIG);
+		intc_bank_write_reg(intc_context[ind].sysconfig,
+					bank, INTC_SYSCONFIG);
+		intc_bank_write_reg(intc_context[ind].protection,
+					bank, INTC_PROTECTION);
+		intc_bank_write_reg(intc_context[ind].idle,
+					bank, INTC_IDLE);
+		intc_bank_write_reg(intc_context[ind].threshold,
+					bank, INTC_THRESHOLD);
+		for (i = 0; i < INTCPS_NR_IRQS; i++)
+			intc_bank_write_reg(intc_context[ind].ilr[i],
+				bank, (0x100 + 0x4*i));
+		for (i = 0; i < INTCPS_NR_MIR_REGS; i++)
+			intc_bank_write_reg(intc_context[ind].mir[i],
+				 &irq_banks[0], INTC_MIR0 + (0x20 * i));
+	}
+	/* MIRs are saved and restore with other PRCM registers */
+}
+
+void omap3_intc_suspend(void)
+{
+	/* A pending interrupt would prevent OMAP from entering suspend */
+	omap_ack_irq(0);
+}
+
+void omap3_intc_prepare_idle(void)
+{
+	/*
+	 * Disable autoidle as it can stall interrupt controller,
+	 * cf. errata ID i540 for 3430 (all revisions up to 3.1.x)
+	 */
+	intc_bank_write_reg(0, &irq_banks[0], INTC_SYSCONFIG);
+}
+
+void omap3_intc_resume_idle(void)
+{
+	/* Re-enable autoidle */
+	intc_bank_write_reg(1, &irq_banks[0], INTC_SYSCONFIG);
+}
+#endif /* CONFIG_ARCH_OMAP3 */