1 files changed, 158 insertions, 0 deletions

diff --git a/arch/arm/plat-mxc/avic.c b/arch/arm/plat-mxc/avic.c
new file mode 100644
index 000000000000..9a4e8a22dd0a
--- /dev/null
+++ b/arch/arm/plat-mxc/avic.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA  02110-1301, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <mach/common.h>
+#include <asm/mach/irq.h>
+#include <mach/hardware.h>
+
+#include "irq-common.h"
+
+#define AVIC_INTCNTL            0x00    /* int control reg */
+#define AVIC_NIMASK             0x04    /* int mask reg */
+#define AVIC_INTENNUM           0x08    /* int enable number reg */
+#define AVIC_INTDISNUM          0x0C    /* int disable number reg */
+#define AVIC_INTENABLEH         0x10    /* int enable reg high */
+#define AVIC_INTENABLEL         0x14    /* int enable reg low */
+#define AVIC_INTTYPEH           0x18    /* int type reg high */
+#define AVIC_INTTYPEL           0x1C    /* int type reg low */
+#define AVIC_NIPRIORITY(x)      (0x20 + 4 * (7 - (x))) /* int priority */
+#define AVIC_NIVECSR            0x40    /* norm int vector/status */
+#define AVIC_FIVECSR            0x44    /* fast int vector/status */
+#define AVIC_INTSRCH            0x48    /* int source reg high */
+#define AVIC_INTSRCL            0x4C    /* int source reg low */
+#define AVIC_INTFRCH            0x50    /* int force reg high */
+#define AVIC_INTFRCL            0x54    /* int force reg low */
+#define AVIC_NIPNDH             0x58    /* norm int pending high */
+#define AVIC_NIPNDL             0x5C    /* norm int pending low */
+#define AVIC_FIPNDH             0x60    /* fast int pending high */
+#define AVIC_FIPNDL             0x64    /* fast int pending low */
+
+void __iomem *avic_base;
+
+#ifdef CONFIG_MXC_IRQ_PRIOR
+static int avic_irq_set_priority(unsigned char irq, unsigned char prio)
+{
+        unsigned int temp;
+        unsigned int mask = 0x0F << irq % 8 * 4;
+
+        if (irq >= MXC_INTERNAL_IRQS)
+                return -EINVAL;;
+
+        temp = __raw_readl(avic_base + AVIC_NIPRIORITY(irq / 8));
+        temp &= ~mask;
+        temp |= prio & mask;
+
+        __raw_writel(temp, avic_base + AVIC_NIPRIORITY(irq / 8));
+
+        return 0;
+}
+#endif
+
+#ifdef CONFIG_FIQ
+static int avic_set_irq_fiq(unsigned int irq, unsigned int type)
+{
+        unsigned int irqt;
+
+        if (irq >= MXC_INTERNAL_IRQS)
+                return -EINVAL;
+
+        if (irq < MXC_INTERNAL_IRQS / 2) {
+                irqt = __raw_readl(avic_base + AVIC_INTTYPEL) & ~(1 << irq);
+                __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEL);
+        } else {
+                irq -= MXC_INTERNAL_IRQS / 2;
+                irqt = __raw_readl(avic_base + AVIC_INTTYPEH) & ~(1 << irq);
+                __raw_writel(irqt | (!!type << irq), avic_base + AVIC_INTTYPEH);
+        }
+
+        return 0;
+}
+#endif /* CONFIG_FIQ */
+
+/* Disable interrupt number "irq" in the AVIC */
+static void mxc_mask_irq(unsigned int irq)
+{
+        __raw_writel(irq, avic_base + AVIC_INTDISNUM);
+}
+
+/* Enable interrupt number "irq" in the AVIC */
+static void mxc_unmask_irq(unsigned int irq)
+{
+        __raw_writel(irq, avic_base + AVIC_INTENNUM);
+}
+
+static struct mxc_irq_chip mxc_avic_chip = {
+        .base = {
+                .ack = mxc_mask_irq,
+                .mask = mxc_mask_irq,
+                .unmask = mxc_unmask_irq,
+        },
+#ifdef CONFIG_MXC_IRQ_PRIOR
+        .set_priority = avic_irq_set_priority,
+#endif
+#ifdef CONFIG_FIQ
+        .set_irq_fiq = avic_set_irq_fiq,
+#endif
+};
+
+/*
+ * This function initializes the AVIC hardware and disables all the
+ * interrupts. It registers the interrupt enable and disable functions
+ * to the kernel for each interrupt source.
+ */
+void __init mxc_init_irq(void __iomem *irqbase)
+{
+        int i;
+
+        avic_base = irqbase;
+
+        /* put the AVIC into the reset value with
+         * all interrupts disabled
+         */
+        __raw_writel(0, avic_base + AVIC_INTCNTL);
+        __raw_writel(0x1f, avic_base + AVIC_NIMASK);
+
+        /* disable all interrupts */
+        __raw_writel(0, avic_base + AVIC_INTENABLEH);
+        __raw_writel(0, avic_base + AVIC_INTENABLEL);
+
+        /* all IRQ no FIQ */
+        __raw_writel(0, avic_base + AVIC_INTTYPEH);
+        __raw_writel(0, avic_base + AVIC_INTTYPEL);
+        for (i = 0; i < MXC_INTERNAL_IRQS; i++) {
+                set_irq_chip(i, &mxc_avic_chip.base);
+                set_irq_handler(i, handle_level_irq);
+                set_irq_flags(i, IRQF_VALID);
+        }
+
+        /* Set default priority value (0) for all IRQ's */
+        for (i = 0; i < 8; i++)
+                __raw_writel(0, avic_base + AVIC_NIPRIORITY(i));
+
+#ifdef CONFIG_FIQ
+        /* Initialize FIQ */
+        init_FIQ();
+#endif
+
+        printk(KERN_INFO "MXC IRQ initialized\n");
+}
+