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Diffstat (limited to 'arch/arm/mach-pnx4008/irq.c')
-rw-r--r--arch/arm/mach-pnx4008/irq.c121
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/arm/mach-pnx4008/irq.c b/arch/arm/mach-pnx4008/irq.c
new file mode 100644
index 000000000000..9b0a8e084e99
--- /dev/null
+++ b/arch/arm/mach-pnx4008/irq.c
@@ -0,0 +1,121 @@
+/*
+ * arch/arm/mach-pnx4008/irq.c
+ *
+ * PNX4008 IRQ controller driver
+ *
+ * Author: Dmitry Chigirev <source@mvista.com>
+ *
+ * Based on reference code received from Philips:
+ * Copyright (C) 2003 Philips Semiconductors
+ *
+ * 2005 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/mach-types.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/system.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/map.h>
+#include <asm/arch/irq.h>
+
+static u8 pnx4008_irq_type[NR_IRQS] = PNX4008_IRQ_TYPES;
+
+static void pnx4008_mask_irq(unsigned int irq)
+{
+ __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
+}
+
+static void pnx4008_unmask_irq(unsigned int irq)
+{
+ __raw_writel(__raw_readl(INTC_ER(irq)) | INTC_BIT(irq), INTC_ER(irq)); /* unmask interrupt */
+}
+
+static void pnx4008_mask_ack_irq(unsigned int irq)
+{
+ __raw_writel(__raw_readl(INTC_ER(irq)) & ~INTC_BIT(irq), INTC_ER(irq)); /* mask interrupt */
+ __raw_writel(INTC_BIT(irq), INTC_SR(irq)); /* clear interrupt status */
+}
+
+static int pnx4008_set_irq_type(unsigned int irq, unsigned int type)
+{
+ switch (type) {
+ case IRQT_RISING:
+ __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq)); /*edge sensitive */
+ __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq)); /*rising edge */
+ set_irq_handler(irq, do_edge_IRQ);
+ break;
+ case IRQT_FALLING:
+ __raw_writel(__raw_readl(INTC_ATR(irq)) | INTC_BIT(irq), INTC_ATR(irq)); /*edge sensitive */
+ __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq)); /*falling edge */
+ set_irq_handler(irq, do_edge_IRQ);
+ break;
+ case IRQT_LOW:
+ __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq)); /*level sensitive */
+ __raw_writel(__raw_readl(INTC_APR(irq)) & ~INTC_BIT(irq), INTC_APR(irq)); /*low level */
+ set_irq_handler(irq, do_level_IRQ);
+ break;
+ case IRQT_HIGH:
+ __raw_writel(__raw_readl(INTC_ATR(irq)) & ~INTC_BIT(irq), INTC_ATR(irq)); /*level sensitive */
+ __raw_writel(__raw_readl(INTC_APR(irq)) | INTC_BIT(irq), INTC_APR(irq)); /* high level */
+ set_irq_handler(irq, do_level_IRQ);
+ break;
+
+ /* IRQT_BOTHEDGE is not supported */
+ default:
+ printk(KERN_ERR "PNX4008 IRQ: Unsupported irq type %d\n", type);
+ return -1;
+ }
+ return 0;
+}
+
+static struct irqchip pnx4008_irq_chip = {
+ .ack = pnx4008_mask_ack_irq,
+ .mask = pnx4008_mask_irq,
+ .unmask = pnx4008_unmask_irq,
+ .set_type = pnx4008_set_irq_type,
+};
+
+void __init pnx4008_init_irq(void)
+{
+ unsigned int i;
+
+ /* configure and enable IRQ 0,1,30,31 (cascade interrupts) mask all others */
+ pnx4008_set_irq_type(SUB1_IRQ_N, pnx4008_irq_type[SUB1_IRQ_N]);
+ pnx4008_set_irq_type(SUB2_IRQ_N, pnx4008_irq_type[SUB2_IRQ_N]);
+ pnx4008_set_irq_type(SUB1_FIQ_N, pnx4008_irq_type[SUB1_FIQ_N]);
+ pnx4008_set_irq_type(SUB2_FIQ_N, pnx4008_irq_type[SUB2_FIQ_N]);
+
+ __raw_writel((1 << SUB2_FIQ_N) | (1 << SUB1_FIQ_N) |
+ (1 << SUB2_IRQ_N) | (1 << SUB1_IRQ_N),
+ INTC_ER(MAIN_BASE_INT));
+ __raw_writel(0, INTC_ER(SIC1_BASE_INT));
+ __raw_writel(0, INTC_ER(SIC2_BASE_INT));
+
+ /* configure all other IRQ's */
+ for (i = 0; i < NR_IRQS; i++) {
+ if (i == SUB2_FIQ_N || i == SUB1_FIQ_N ||
+ i == SUB2_IRQ_N || i == SUB1_IRQ_N)
+ continue;
+ set_irq_flags(i, IRQF_VALID);
+ set_irq_chip(i, &pnx4008_irq_chip);
+ pnx4008_set_irq_type(i, pnx4008_irq_type[i]);
+ }
+}
+