1 files changed, 215 insertions, 0 deletions

diff --git a/drivers/sh/intc/chip.c b/drivers/sh/intc/chip.c
new file mode 100644
index 000000000000..35c03706cc21
--- /dev/null
+++ b/drivers/sh/intc/chip.c
@@ -0,0 +1,215 @@
+/*
+ * IRQ chip definitions for INTC IRQs.
+ *
+ * Copyright (C) 2007, 2008 Magnus Damm
+ * Copyright (C) 2009, 2010 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/cpumask.h>
+#include <linux/io.h>
+#include "internals.h"
+
+void _intc_enable(unsigned int irq, unsigned long handle)
+{
+        struct intc_desc_int *d = get_intc_desc(irq);
+        unsigned long addr;
+        unsigned int cpu;
+
+        for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
+#ifdef CONFIG_SMP
+                if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity))
+                        continue;
+#endif
+                addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
+                intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
+                                                    [_INTC_FN(handle)], irq);
+        }
+
+        intc_balancing_enable(irq);
+}
+
+static void intc_enable(unsigned int irq)
+{
+        _intc_enable(irq, (unsigned long)get_irq_chip_data(irq));
+}
+
+static void intc_disable(unsigned int irq)
+{
+        struct intc_desc_int *d = get_intc_desc(irq);
+        unsigned long handle = (unsigned long)get_irq_chip_data(irq);
+        unsigned long addr;
+        unsigned int cpu;
+
+        intc_balancing_disable(irq);
+
+        for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
+#ifdef CONFIG_SMP
+                if (!cpumask_test_cpu(cpu, irq_to_desc(irq)->affinity))
+                        continue;
+#endif
+                addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
+                intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
+                                                     [_INTC_FN(handle)], irq);
+        }
+}
+
+static int intc_set_wake(unsigned int irq, unsigned int on)
+{
+        return 0; /* allow wakeup, but setup hardware in intc_suspend() */
+}
+
+#ifdef CONFIG_SMP
+/*
+ * This is held with the irq desc lock held, so we don't require any
+ * additional locking here at the intc desc level. The affinity mask is
+ * later tested in the enable/disable paths.
+ */
+static int intc_set_affinity(unsigned int irq, const struct cpumask *cpumask)
+{
+        if (!cpumask_intersects(cpumask, cpu_online_mask))
+                return -1;
+
+        cpumask_copy(irq_to_desc(irq)->affinity, cpumask);
+
+        return 0;
+}
+#endif
+
+static void intc_mask_ack(unsigned int irq)
+{
+        struct intc_desc_int *d = get_intc_desc(irq);
+        unsigned long handle = intc_get_ack_handle(irq);
+        unsigned long addr;
+
+        intc_disable(irq);
+
+        /* read register and write zero only to the associated bit */
+        if (handle) {
+                unsigned int value;
+
+                addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
+                value = intc_set_field_from_handle(0, 1, handle);
+
+                switch (_INTC_FN(handle)) {
+                case REG_FN_MODIFY_BASE + 0:    /* 8bit */
+                        __raw_readb(addr);
+                        __raw_writeb(0xff ^ value, addr);
+                        break;
+                case REG_FN_MODIFY_BASE + 1:    /* 16bit */
+                        __raw_readw(addr);
+                        __raw_writew(0xffff ^ value, addr);
+                        break;
+                case REG_FN_MODIFY_BASE + 3:    /* 32bit */
+                        __raw_readl(addr);
+                        __raw_writel(0xffffffff ^ value, addr);
+                        break;
+                default:
+                        BUG();
+                        break;
+                }
+        }
+}
+
+static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
+                                             unsigned int nr_hp,
+                                             unsigned int irq)
+{
+        int i;
+
+        /*
+         * this doesn't scale well, but...
+         *
+         * this function should only be used for cerain uncommon
+         * operations such as intc_set_priority() and intc_set_type()
+         * and in those rare cases performance doesn't matter that much.
+         * keeping the memory footprint low is more important.
+         *
+         * one rather simple way to speed this up and still keep the
+         * memory footprint down is to make sure the array is sorted
+         * and then perform a bisect to lookup the irq.
+         */
+        for (i = 0; i < nr_hp; i++) {
+                if ((hp + i)->irq != irq)
+                        continue;
+
+                return hp + i;
+        }
+
+        return NULL;
+}
+
+int intc_set_priority(unsigned int irq, unsigned int prio)
+{
+        struct intc_desc_int *d = get_intc_desc(irq);
+        struct intc_handle_int *ihp;
+
+        if (!intc_get_prio_level(irq) || prio <= 1)
+                return -EINVAL;
+
+        ihp = intc_find_irq(d->prio, d->nr_prio, irq);
+        if (ihp) {
+                if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
+                        return -EINVAL;
+
+                intc_set_prio_level(irq, prio);
+
+                /*
+                 * only set secondary masking method directly
+                 * primary masking method is using intc_prio_level[irq]
+                 * priority level will be set during next enable()
+                 */
+                if (_INTC_FN(ihp->handle) != REG_FN_ERR)
+                        _intc_enable(irq, ihp->handle);
+        }
+        return 0;
+}
+
+#define VALID(x) (x | 0x80)
+
+static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
+        [IRQ_TYPE_EDGE_FALLING] = VALID(0),
+        [IRQ_TYPE_EDGE_RISING] = VALID(1),
+        [IRQ_TYPE_LEVEL_LOW] = VALID(2),
+        /* SH7706, SH7707 and SH7709 do not support high level triggered */
+#if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
+    !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
+    !defined(CONFIG_CPU_SUBTYPE_SH7709)
+        [IRQ_TYPE_LEVEL_HIGH] = VALID(3),
+#endif
+};
+
+static int intc_set_type(unsigned int irq, unsigned int type)
+{
+        struct intc_desc_int *d = get_intc_desc(irq);
+        unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
+        struct intc_handle_int *ihp;
+        unsigned long addr;
+
+        if (!value)
+                return -EINVAL;
+
+        ihp = intc_find_irq(d->sense, d->nr_sense, irq);
+        if (ihp) {
+                addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
+                intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value);
+        }
+
+        return 0;
+}
+
+struct irq_chip intc_irq_chip   = {
+        .mask           = intc_disable,
+        .unmask         = intc_enable,
+        .mask_ack       = intc_mask_ack,
+        .enable         = intc_enable,
+        .disable        = intc_disable,
+        .shutdown       = intc_disable,
+        .set_type       = intc_set_type,
+        .set_wake       = intc_set_wake,
+#ifdef CONFIG_SMP
+        .set_affinity   = intc_set_affinity,
+#endif
+};