summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-davinci/irq.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-davinci/irq.c')
-rw-r--r--arch/arm/mach-davinci/irq.c226
1 files changed, 226 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/irq.c b/arch/arm/mach-davinci/irq.c
new file mode 100644
index 0000000..1333d84
--- /dev/null
+++ b/arch/arm/mach-davinci/irq.c
@@ -0,0 +1,226 @@
+/*
+ * 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 <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/mach/irq.h>
+
+#define IRQ_BIT(irq) ((irq) & 0x1f)
+
+#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 unsigned int davinci_irq_readl(int offset)
+{
+ return davinci_readl(DAVINCI_ARM_INTC_BASE + offset);
+}
+
+static inline void davinci_irq_writel(unsigned long value, int offset)
+{
+ davinci_writel(value, DAVINCI_ARM_INTC_BASE + offset);
+}
+
+/* Disable interrupt */
+static void davinci_mask_irq(unsigned int irq)
+{
+ unsigned int mask;
+ u32 l;
+
+ mask = 1 << IRQ_BIT(irq);
+
+ if (irq > 31) {
+ l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
+ l &= ~mask;
+ davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
+ } else {
+ l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
+ l &= ~mask;
+ davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
+ }
+}
+
+/* Enable interrupt */
+static void davinci_unmask_irq(unsigned int irq)
+{
+ unsigned int mask;
+ u32 l;
+
+ mask = 1 << IRQ_BIT(irq);
+
+ if (irq > 31) {
+ l = davinci_irq_readl(IRQ_ENT_REG1_OFFSET);
+ l |= mask;
+ davinci_irq_writel(l, IRQ_ENT_REG1_OFFSET);
+ } else {
+ l = davinci_irq_readl(IRQ_ENT_REG0_OFFSET);
+ l |= mask;
+ davinci_irq_writel(l, IRQ_ENT_REG0_OFFSET);
+ }
+}
+
+/* EOI interrupt */
+static void davinci_ack_irq(unsigned int irq)
+{
+ unsigned int mask;
+
+ mask = 1 << IRQ_BIT(irq);
+
+ if (irq > 31)
+ davinci_irq_writel(mask, IRQ_REG1_OFFSET);
+ else
+ davinci_irq_writel(mask, IRQ_REG0_OFFSET);
+}
+
+static struct irq_chip davinci_irq_chip_0 = {
+ .name = "AINTC",
+ .ack = davinci_ack_irq,
+ .mask = davinci_mask_irq,
+ .unmask = davinci_unmask_irq,
+};
+
+
+/* FIQ are pri 0-1; otherwise 2-7, with 7 lowest priority */
+static const u8 default_priorities[DAVINCI_N_AINTC_IRQ] __initdata = {
+ [IRQ_VDINT0] = 2,
+ [IRQ_VDINT1] = 6,
+ [IRQ_VDINT2] = 6,
+ [IRQ_HISTINT] = 6,
+ [IRQ_H3AINT] = 6,
+ [IRQ_PRVUINT] = 6,
+ [IRQ_RSZINT] = 6,
+ [7] = 7,
+ [IRQ_VENCINT] = 6,
+ [IRQ_ASQINT] = 6,
+ [IRQ_IMXINT] = 6,
+ [IRQ_VLCDINT] = 6,
+ [IRQ_USBINT] = 4,
+ [IRQ_EMACINT] = 4,
+ [14] = 7,
+ [15] = 7,
+ [IRQ_CCINT0] = 5, /* dma */
+ [IRQ_CCERRINT] = 5, /* dma */
+ [IRQ_TCERRINT0] = 5, /* dma */
+ [IRQ_TCERRINT] = 5, /* dma */
+ [IRQ_PSCIN] = 7,
+ [21] = 7,
+ [IRQ_IDE] = 4,
+ [23] = 7,
+ [IRQ_MBXINT] = 7,
+ [IRQ_MBRINT] = 7,
+ [IRQ_MMCINT] = 7,
+ [IRQ_SDIOINT] = 7,
+ [28] = 7,
+ [IRQ_DDRINT] = 7,
+ [IRQ_AEMIFINT] = 7,
+ [IRQ_VLQINT] = 4,
+ [IRQ_TINT0_TINT12] = 2, /* clockevent */
+ [IRQ_TINT0_TINT34] = 2, /* clocksource */
+ [IRQ_TINT1_TINT12] = 7, /* DSP timer */
+ [IRQ_TINT1_TINT34] = 7, /* system tick */
+ [IRQ_PWMINT0] = 7,
+ [IRQ_PWMINT1] = 7,
+ [IRQ_PWMINT2] = 7,
+ [IRQ_I2C] = 3,
+ [IRQ_UARTINT0] = 3,
+ [IRQ_UARTINT1] = 3,
+ [IRQ_UARTINT2] = 3,
+ [IRQ_SPINT0] = 3,
+ [IRQ_SPINT1] = 3,
+ [45] = 7,
+ [IRQ_DSP2ARM0] = 4,
+ [IRQ_DSP2ARM1] = 4,
+ [IRQ_GPIO0] = 7,
+ [IRQ_GPIO1] = 7,
+ [IRQ_GPIO2] = 7,
+ [IRQ_GPIO3] = 7,
+ [IRQ_GPIO4] = 7,
+ [IRQ_GPIO5] = 7,
+ [IRQ_GPIO6] = 7,
+ [IRQ_GPIO7] = 7,
+ [IRQ_GPIOBNK0] = 7,
+ [IRQ_GPIOBNK1] = 7,
+ [IRQ_GPIOBNK2] = 7,
+ [IRQ_GPIOBNK3] = 7,
+ [IRQ_GPIOBNK4] = 7,
+ [IRQ_COMMTX] = 7,
+ [IRQ_COMMRX] = 7,
+ [IRQ_EMUINT] = 7,
+};
+
+/* ARM Interrupt Controller Initialization */
+void __init davinci_irq_init(void)
+{
+ unsigned i;
+ const u8 *priority = default_priorities;
+
+ /* 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) {
+ unsigned j;
+ u32 pri;
+
+ for (j = 0, pri = 0; j < 32; j += 4, priority++)
+ pri |= (*priority & 0x07) << j;
+ davinci_irq_writel(pri, i);
+ }
+
+ /* set up genirq dispatch for ARM INTC */
+ for (i = 0; i < DAVINCI_N_AINTC_IRQ; i++) {
+ set_irq_chip(i, &davinci_irq_chip_0);
+ set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
+ if (i != IRQ_TINT1_TINT34)
+ set_irq_handler(i, handle_edge_irq);
+ else
+ set_irq_handler(i, handle_level_irq);
+ }
+}
OpenPOWER on IntegriCloud