--- /dev/null
+/*
+ * 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(struct irq_data *data, unsigned long handle)
+{
+ unsigned int irq = data->irq;
+ 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, data->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(struct irq_data *data)
+{
+ _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data));
+}
+
+static void intc_disable(struct irq_data *data)
+{
+ unsigned int irq = data->irq;
+ struct intc_desc_int *d = get_intc_desc(irq);
+ unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data);
+ 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, data->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(struct irq_data *data, 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(struct irq_data *data,
+ const struct cpumask *cpumask,
+ bool force)
+{
+ if (!cpumask_intersects(cpumask, cpu_online_mask))
+ return -1;
+
+ cpumask_copy(data->affinity, cpumask);
+
+ return 0;
+}
+#endif
+
+static void intc_mask_ack(struct irq_data *data)
+{
+ unsigned int irq = data->irq;
+ struct intc_desc_int *d = get_intc_desc(irq);
+ unsigned long handle = intc_get_ack_handle(irq);
+ unsigned long addr;
+
+ intc_disable(data);
+
+ /* 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 irq_data *data = irq_get_irq_data(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(data, ihp->handle);
+ }
+ return 0;
+}
+
+#define SENSE_VALID_FLAG 0x80
+#define VALID(x) (x | SENSE_VALID_FLAG)
+
+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(struct irq_data *data, unsigned int type)
+{
+ unsigned int irq = data->irq;
+ 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 & ~SENSE_VALID_FLAG);
+ }
+
+ return 0;
+}
+
+struct irq_chip intc_irq_chip = {
+ .irq_mask = intc_disable,
+ .irq_unmask = intc_enable,
+ .irq_mask_ack = intc_mask_ack,
+ .irq_enable = intc_enable,
+ .irq_disable = intc_disable,
+ .irq_shutdown = intc_disable,
+ .irq_set_type = intc_set_type,
+ .irq_set_wake = intc_set_wake,
+#ifdef CONFIG_SMP
+ .irq_set_affinity = intc_set_affinity,
+#endif
+};
projects / mv-sheeva.git / blobdiff