Initial import

1 files changed, 117 insertions, 0 deletions

diff --git a/arch/arm/mach-davinci/irq.c b/arch/arm/mach-davinci/irq.c
new file mode 100644
index 000000000..952dc126c
--- /dev/null
+++ b/arch/arm/mach-davinci/irq.c
@@ -0,0 +1,117 @@
+/*
+ * Interrupt handler for DaVinci boards.
+ *
+ * Copyright (C) 2006 Texas Instruments.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/cputype.h>
+#include <mach/common.h>
+#include <asm/mach/irq.h>
+
+#define FIQ_REG0_OFFSET		0x0000
+#define FIQ_REG1_OFFSET		0x0004
+#define IRQ_REG0_OFFSET		0x0008
+#define IRQ_REG1_OFFSET		0x000C
+#define IRQ_ENT_REG0_OFFSET	0x0018
+#define IRQ_ENT_REG1_OFFSET	0x001C
+#define IRQ_INCTL_REG_OFFSET	0x0020
+#define IRQ_EABASE_REG_OFFSET	0x0024
+#define IRQ_INTPRI0_REG_OFFSET	0x0030
+#define IRQ_INTPRI7_REG_OFFSET	0x004C
+
+static inline void davinci_irq_writel(unsigned long value, int offset)
+{
+	__raw_writel(value, davinci_intc_base + offset);
+}
+
+static __init void
+davinci_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("AINTC", 1, irq_start, base, handle_edge_irq);
+	if (!gc) {
+		pr_err("%s: irq_alloc_generic_chip for IRQ %u failed\n",
+		       __func__, irq_start);
+		return;
+	}
+
+	ct = gc->chip_types;
+	ct->chip.irq_ack = irq_gc_ack_set_bit;
+	ct->chip.irq_mask = irq_gc_mask_clr_bit;
+	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+
+	ct->regs.ack = IRQ_REG0_OFFSET;
+	ct->regs.mask = IRQ_ENT_REG0_OFFSET;
+	irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE,
+			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
+}
+
+/* ARM Interrupt Controller Initialization */
+void __init davinci_irq_init(void)
+{
+	unsigned i, j;
+	const u8 *davinci_def_priorities = davinci_soc_info.intc_irq_prios;
+
+	davinci_intc_type = DAVINCI_INTC_TYPE_AINTC;
+	davinci_intc_base = ioremap(davinci_soc_info.intc_base, SZ_4K);
+	if (WARN_ON(!davinci_intc_base))
+		return;
+
+	/* Clear all interrupt requests */
+	davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
+
+	/* Disable all interrupts */
+	davinci_irq_writel(0x0, IRQ_ENT_REG0_OFFSET);
+	davinci_irq_writel(0x0, IRQ_ENT_REG1_OFFSET);
+
+	/* Interrupts disabled immediately, IRQ entry reflects all */
+	davinci_irq_writel(0x0, IRQ_INCTL_REG_OFFSET);
+
+	/* we don't use the hardware vector table, just its entry addresses */
+	davinci_irq_writel(0, IRQ_EABASE_REG_OFFSET);
+
+	/* Clear all interrupt requests */
+	davinci_irq_writel(~0x0, FIQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, FIQ_REG1_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG0_OFFSET);
+	davinci_irq_writel(~0x0, IRQ_REG1_OFFSET);
+
+	for (i = IRQ_INTPRI0_REG_OFFSET; i <= IRQ_INTPRI7_REG_OFFSET; i += 4) {
+		u32		pri;
+
+		for (j = 0, pri = 0; j < 32; j += 4, davinci_def_priorities++)
+			pri |= (*davinci_def_priorities & 0x07) << j;
+		davinci_irq_writel(pri, i);
+	}
+
+	for (i = 0, j = 0; i < davinci_soc_info.intc_irq_num; i += 32, j += 0x04)
+		davinci_alloc_gc(davinci_intc_base + j, i, 32);
+
+	irq_set_handler(IRQ_TINT1_TINT34, handle_level_irq);
+}