1 files changed, 219 insertions, 0 deletions

diff --git a/arch/arm/mach-omap/irq.c b/arch/arm/mach-omap/irq.c
new file mode 100644
index 000000000000..f01c99266a86
--- /dev/null
+++ b/arch/arm/mach-omap/irq.c
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+/*
+ * linux/arch/arm/mach-omap/irq.c
+ *
+ * Interrupt handler for all OMAP boards
+ *
+ * Copyright (C) 2004 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ * Major cleanups by Juha Yrjölä <juha.yrjola@nokia.com>
+ *
+ * Completely re-written to support various OMAP chips with bank specific
+ * interrupt handlers.
+ *
+ * Some snippets of the code taken from the older OMAP interrupt handler
+ * Copyright (C) 2001 RidgeRun, Inc. Greg Lonnon <glonnon@ridgerun.com>
+ *
+ * GPIO interrupt handler moved to gpio.c by Juha Yrjola
+ *
+ * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/arch/gpio.h>
+
+#include <asm/io.h>
+
+#define IRQ_BANK(irq) ((irq) >> 5)
+#define IRQ_BIT(irq)  ((irq) & 0x1f)
+
+struct omap_irq_bank {
+        unsigned long base_reg;
+        unsigned long trigger_map;
+};
+
+static unsigned int irq_bank_count = 0;
+static struct omap_irq_bank *irq_banks;
+
+static inline unsigned int irq_bank_readl(int bank, int offset)
+{
+        return omap_readl(irq_banks[bank].base_reg + offset);
+}
+
+static inline void irq_bank_writel(unsigned long value, int bank, int offset)
+{
+        omap_writel(value, irq_banks[bank].base_reg + offset);
+}
+
+static void omap_ack_irq(unsigned int irq)
+{
+        if (irq > 31)
+                omap_writel(0x1, OMAP_IH2_BASE + IRQ_CONTROL_REG_OFFSET);
+
+        omap_writel(0x1, OMAP_IH1_BASE + IRQ_CONTROL_REG_OFFSET);
+}
+
+static void omap_mask_irq(unsigned int irq)
+{
+        int bank = IRQ_BANK(irq);
+        u32 l;
+
+        l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
+        l |= 1 << IRQ_BIT(irq);
+        omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
+}
+
+static void omap_unmask_irq(unsigned int irq)
+{
+        int bank = IRQ_BANK(irq);
+        u32 l;
+
+        l = omap_readl(irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
+        l &= ~(1 << IRQ_BIT(irq));
+        omap_writel(l, irq_banks[bank].base_reg + IRQ_MIR_REG_OFFSET);
+}
+
+static void omap_mask_ack_irq(unsigned int irq)
+{
+        omap_mask_irq(irq);
+        omap_ack_irq(irq);
+}
+
+/*
+ * Allows tuning the IRQ type and priority
+ *
+ * NOTE: There is currently no OMAP fiq handler for Linux. Read the
+ *       mailing list threads on FIQ handlers if you are planning to
+ *       add a FIQ handler for OMAP.
+ */
+static void omap_irq_set_cfg(int irq, int fiq, int priority, int trigger)
+{
+        signed int bank;
+        unsigned long val, offset;
+
+        bank = IRQ_BANK(irq);
+        /* FIQ is only available on bank 0 interrupts */
+        fiq = bank ? 0 : (fiq & 0x1);
+        val = fiq | ((priority & 0x1f) << 2) | ((trigger & 0x1) << 1);
+        offset = IRQ_ILR0_REG_OFFSET + IRQ_BIT(irq) * 0x4;
+        irq_bank_writel(val, bank, offset);
+}
+
+#ifdef CONFIG_ARCH_OMAP730
+static struct omap_irq_bank omap730_irq_banks[] = {
+        { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3f8e22f },
+        { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb9c1f2 },
+        { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0x800040f3 },
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1510
+static struct omap_irq_bank omap1510_irq_banks[] = {
+        { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3febfff },
+        { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xffbfffed },
+};
+#endif
+
+#if defined(CONFIG_ARCH_OMAP16XX)
+
+static struct omap_irq_bank omap1610_irq_banks[] = {
+        { .base_reg = OMAP_IH1_BASE,            .trigger_map = 0xb3fefe8f },
+        { .base_reg = OMAP_IH2_BASE,            .trigger_map = 0xfdb7c1fd },
+        { .base_reg = OMAP_IH2_BASE + 0x100,    .trigger_map = 0xfffff7ff },
+        { .base_reg = OMAP_IH2_BASE + 0x200,    .trigger_map = 0xffffffff },
+};
+#endif
+
+static struct irqchip omap_irq_chip = {
+        .ack    = omap_mask_ack_irq,
+        .mask   = omap_mask_irq,
+        .unmask = omap_unmask_irq,
+};
+
+void __init omap_init_irq(void)
+{
+        int i, j;
+
+#ifdef CONFIG_ARCH_OMAP730
+        if (cpu_is_omap730()) {
+                irq_banks = omap730_irq_banks;
+                irq_bank_count = ARRAY_SIZE(omap730_irq_banks);
+        }
+#endif
+#ifdef CONFIG_ARCH_OMAP1510
+        if (cpu_is_omap1510()) {
+                irq_banks = omap1510_irq_banks;
+                irq_bank_count = ARRAY_SIZE(omap1510_irq_banks);
+        }
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+        if (cpu_is_omap16xx()) {
+                irq_banks = omap1610_irq_banks;
+                irq_bank_count = ARRAY_SIZE(omap1610_irq_banks);
+        }
+#endif
+        printk("Total of %i interrupts in %i interrupt banks\n",
+               irq_bank_count * 32, irq_bank_count);
+
+        /* Mask and clear all interrupts */
+        for (i = 0; i < irq_bank_count; i++) {
+                irq_bank_writel(~0x0, i, IRQ_MIR_REG_OFFSET);
+                irq_bank_writel(0x0, i, IRQ_ITR_REG_OFFSET);
+        }
+
+        /* Clear any pending interrupts */
+        irq_bank_writel(0x03, 0, IRQ_CONTROL_REG_OFFSET);
+        irq_bank_writel(0x03, 1, IRQ_CONTROL_REG_OFFSET);
+
+        /* Enable interrupts in global mask */
+        if (cpu_is_omap730()) {
+                irq_bank_writel(0x0, 0, IRQ_GMR_REG_OFFSET);
+        }
+
+        /* Install the interrupt handlers for each bank */
+        for (i = 0; i < irq_bank_count; i++) {
+                for (j = i * 32; j < (i + 1) * 32; j++) {
+                        int irq_trigger;
+
+                        irq_trigger = irq_banks[i].trigger_map >> IRQ_BIT(j);
+                        omap_irq_set_cfg(j, 0, 0, irq_trigger);
+
+                        set_irq_chip(j, &omap_irq_chip);
+                        set_irq_handler(j, do_level_IRQ);
+                        set_irq_flags(j, IRQF_VALID);
+                }
+        }
+
+        /* Unmask level 2 handler */
+        if (cpu_is_omap730()) {
+                omap_unmask_irq(INT_730_IH2_IRQ);
+        } else {
+                omap_unmask_irq(INT_IH2_IRQ);
+        }
+}