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Diffstat (limited to 'arch/arm/mach-ks8695/irq.c')
-rw-r--r--arch/arm/mach-ks8695/irq.c175
1 files changed, 175 insertions, 0 deletions
diff --git a/arch/arm/mach-ks8695/irq.c b/arch/arm/mach-ks8695/irq.c
new file mode 100644
index 00000000000..2407bba0054
--- /dev/null
+++ b/arch/arm/mach-ks8695/irq.c
@@ -0,0 +1,175 @@
+/*
+ * arch/arm/mach-ks8695/irq.c
+ *
+ * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
+ * Copyright (C) 2006 Simtec Electronics
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/ptrace.h>
+#include <linux/sysdev.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <asm/mach/irq.h>
+
+#include <asm/arch/regs-irq.h>
+#include <asm/arch/regs-gpio.h>
+
+static void ks8695_irq_mask(unsigned int irqno)
+{
+ unsigned long inten;
+
+ inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
+ inten &= ~(1 << irqno);
+
+ __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
+}
+
+static void ks8695_irq_unmask(unsigned int irqno)
+{
+ unsigned long inten;
+
+ inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
+ inten |= (1 << irqno);
+
+ __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
+}
+
+static void ks8695_irq_ack(unsigned int irqno)
+{
+ __raw_writel((1 << irqno), KS8695_IRQ_VA + KS8695_INTST);
+}
+
+
+static struct irq_chip ks8695_irq_level_chip;
+static struct irq_chip ks8695_irq_edge_chip;
+
+
+static int ks8695_irq_set_type(unsigned int irqno, unsigned int type)
+{
+ unsigned long ctrl, mode;
+ unsigned short level_triggered = 0;
+
+ ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
+
+ switch (type) {
+ case IRQT_HIGH:
+ mode = IOPC_TM_HIGH;
+ level_triggered = 1;
+ break;
+ case IRQT_LOW:
+ mode = IOPC_TM_LOW;
+ level_triggered = 1;
+ break;
+ case IRQT_RISING:
+ mode = IOPC_TM_RISING;
+ break;
+ case IRQT_FALLING:
+ mode = IOPC_TM_FALLING;
+ break;
+ case IRQT_BOTHEDGE:
+ mode = IOPC_TM_EDGE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (irqno) {
+ case KS8695_IRQ_EXTERN0:
+ ctrl &= ~IOPC_IOEINT0TM;
+ ctrl |= IOPC_IOEINT0_MODE(mode);
+ break;
+ case KS8695_IRQ_EXTERN1:
+ ctrl &= ~IOPC_IOEINT1TM;
+ ctrl |= IOPC_IOEINT1_MODE(mode);
+ break;
+ case KS8695_IRQ_EXTERN2:
+ ctrl &= ~IOPC_IOEINT2TM;
+ ctrl |= IOPC_IOEINT2_MODE(mode);
+ break;
+ case KS8695_IRQ_EXTERN3:
+ ctrl &= ~IOPC_IOEINT3TM;
+ ctrl |= IOPC_IOEINT3_MODE(mode);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (level_triggered) {
+ set_irq_chip(irqno, &ks8695_irq_level_chip);
+ set_irq_handler(irqno, handle_level_irq);
+ }
+ else {
+ set_irq_chip(irqno, &ks8695_irq_edge_chip);
+ set_irq_handler(irqno, handle_edge_irq);
+ }
+
+ __raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
+ return 0;
+}
+
+static struct irq_chip ks8695_irq_level_chip = {
+ .ack = ks8695_irq_mask,
+ .mask = ks8695_irq_mask,
+ .unmask = ks8695_irq_unmask,
+ .set_type = ks8695_irq_set_type,
+};
+
+static struct irq_chip ks8695_irq_edge_chip = {
+ .ack = ks8695_irq_ack,
+ .mask = ks8695_irq_mask,
+ .unmask = ks8695_irq_unmask,
+ .set_type = ks8695_irq_set_type,
+};
+
+void __init ks8695_init_irq(void)
+{
+ unsigned int irq;
+
+ /* Disable all interrupts initially */
+ __raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC);
+ __raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN);
+
+ for (irq = 0; irq < NR_IRQS; irq++) {
+ switch (irq) {
+ /* Level-triggered interrupts */
+ case KS8695_IRQ_BUS_ERROR:
+ case KS8695_IRQ_UART_MODEM_STATUS:
+ case KS8695_IRQ_UART_LINE_STATUS:
+ case KS8695_IRQ_UART_RX:
+ case KS8695_IRQ_COMM_TX:
+ case KS8695_IRQ_COMM_RX:
+ set_irq_chip(irq, &ks8695_irq_level_chip);
+ set_irq_handler(irq, handle_level_irq);
+ break;
+
+ /* Edge-triggered interrupts */
+ default:
+ ks8695_irq_ack(irq); /* clear pending bit */
+ set_irq_chip(irq, &ks8695_irq_edge_chip);
+ set_irq_handler(irq, handle_edge_irq);
+ }
+
+ set_irq_flags(irq, IRQF_VALID);
+ }
+}