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Subject[PATCH v3 1/2] irq: add irq_domain support to generic-chip
Date
From: Rob Herring <rob.herring@calxeda.com>

Add irq domain support to irq generic-chip. This enables users of
generic-chip to support dynamic irq assignment needed for DT interrupt
binding.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Thomas Gleixner <tglx@linutronix.de>
---
include/linux/irq.h | 10 +++
kernel/irq/generic-chip.c | 134 ++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 129 insertions(+), 15 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index bff29c5..482d198 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -665,6 +665,10 @@ struct irq_chip_generic {
void __iomem *reg_base;
unsigned int irq_base;
unsigned int irq_cnt;
+ struct irq_domain *domain;
+ unsigned int flags;
+ unsigned int irq_set;
+ unsigned int irq_clr;
u32 mask_cache;
u32 type_cache;
u32 polarity_cache;
@@ -707,6 +711,12 @@ irq_alloc_generic_chip(const char *name, int nr_ct, unsigned int irq_base,
void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
enum irq_gc_flags flags, unsigned int clr,
unsigned int set);
+
+struct device_node;
+void irq_setup_generic_chip_domain(struct irq_chip_generic *gc,
+ struct device_node *node, u32 msk,
+ enum irq_gc_flags flags, unsigned int clr,
+ unsigned int set);
int irq_setup_alt_chip(struct irq_data *d, unsigned int type);
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set);
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index c89295a..2519663 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -5,6 +5,7 @@
*/
#include <linux/io.h>
#include <linux/irq.h>
+#include <linux/irqdomain.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/interrupt.h>
@@ -39,7 +40,7 @@ void irq_gc_noop(struct irq_data *d)
void irq_gc_mask_disable_reg(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->disable);
@@ -57,7 +58,7 @@ void irq_gc_mask_disable_reg(struct irq_data *d)
void irq_gc_mask_set_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
gc->mask_cache |= mask;
@@ -75,7 +76,7 @@ void irq_gc_mask_set_bit(struct irq_data *d)
void irq_gc_mask_clr_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
gc->mask_cache &= ~mask;
@@ -93,7 +94,7 @@ void irq_gc_mask_clr_bit(struct irq_data *d)
void irq_gc_unmask_enable_reg(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->enable);
@@ -108,7 +109,7 @@ void irq_gc_unmask_enable_reg(struct irq_data *d)
void irq_gc_ack_set_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
@@ -122,7 +123,7 @@ void irq_gc_ack_set_bit(struct irq_data *d)
void irq_gc_ack_clr_bit(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = ~(1 << (d->irq - gc->irq_base));
+ u32 mask = ~(1 << d->hwirq);

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
@@ -136,7 +137,7 @@ void irq_gc_ack_clr_bit(struct irq_data *d)
void irq_gc_mask_disable_reg_and_ack(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->mask);
@@ -151,7 +152,7 @@ void irq_gc_mask_disable_reg_and_ack(struct irq_data *d)
void irq_gc_eoi(struct irq_data *d)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->eoi);
@@ -169,7 +170,7 @@ void irq_gc_eoi(struct irq_data *d)
int irq_gc_set_wake(struct irq_data *d, unsigned int on)
{
struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
- u32 mask = 1 << (d->irq - gc->irq_base);
+ u32 mask = 1 << d->hwirq;

if (!(mask & gc->wake_enabled))
return -EINVAL;
@@ -257,11 +258,99 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
irq_set_chip_and_handler(i, &ct->chip, ct->handler);
irq_set_chip_data(i, gc);
irq_modify_status(i, clr, set);
+ irq_get_irq_data(i)->hwirq = i - gc->irq_base;
}
gc->irq_cnt = i - gc->irq_base;
}
EXPORT_SYMBOL_GPL(irq_setup_generic_chip);

+#ifdef CONFIG_IRQ_DOMAIN
+static int irq_gc_irq_domain_match(struct irq_domain *d, struct device_node *np)
+{
+ struct irq_chip_generic *gc;
+
+ if (d->of_node != NULL && d->of_node == np) {
+ list_for_each_entry(gc, &gc_list, list) {
+ if ((gc == d->host_data) && (d == gc->domain))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int irq_gc_irq_domain_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ struct irq_chip_generic *gc = d->host_data;
+ struct irq_chip_type *ct = gc->chip_types;
+
+ if (gc->flags & IRQ_GC_INIT_NESTED_LOCK)
+ irq_set_lockdep_class(irq, &irq_nested_lock_class);
+
+ irq_set_chip_and_handler(irq, &ct->chip, ct->handler);
+ irq_set_chip_data(irq, gc);
+ irq_modify_status(irq, gc->irq_clr, gc->irq_set);
+
+ return 0;
+}
+
+static struct irq_domain_ops irq_gc_irq_domain_ops = {
+ .match = irq_gc_irq_domain_match,
+ .map = irq_gc_irq_domain_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+/*
+ * irq_setup_generic_chip_domain - Setup a range of interrupts with a generic chip and domain
+ * @gc: Generic irq chip holding all data
+ * @node: Device tree node pointer for domain
+ * @msk: Bitmask holding the irqs to initialize relative to gc->irq_base
+ * @flags: Flags for initialization
+ * @clr: IRQ_* bits to clear
+ * @set: IRQ_* bits to set
+ *
+ * Set up max. 32 interrupts starting from gc->irq_base using an irq domain.
+ * Note, this initializes all interrupts to the primary irq_chip_type and its
+ * associated handler.
+ */
+void irq_setup_generic_chip_domain(struct irq_chip_generic *gc,
+ struct device_node *node, u32 msk,
+ enum irq_gc_flags flags, unsigned int clr,
+ unsigned int set)
+{
+ struct irq_chip_type *ct = gc->chip_types;
+
+ if (!node) {
+ irq_setup_generic_chip(gc, msk, flags, clr, set);
+ return;
+ }
+
+ raw_spin_lock(&gc_lock);
+ list_add_tail(&gc->list, &gc_list);
+ raw_spin_unlock(&gc_lock);
+
+ /* Init mask cache ? */
+ if (flags & IRQ_GC_INIT_MASK_CACHE)
+ gc->mask_cache = irq_reg_readl(gc->reg_base + ct->regs.mask);
+
+ gc->flags = flags;
+ gc->irq_clr = clr;
+ gc->irq_set = set;
+
+ /* Users of domains should not use irq_base */
+ if ((int)gc->irq_base > 0)
+ gc->domain = irq_domain_add_legacy(node, fls(msk),
+ gc->irq_base, 0,
+ &irq_gc_irq_domain_ops, gc);
+ else {
+ gc->irq_base = 0;
+ gc->domain = irq_domain_add_linear(node, fls(msk),
+ &irq_gc_irq_domain_ops, gc);
+ }
+}
+EXPORT_SYMBOL_GPL(irq_setup_generic_chip_domain);
+#endif
+
/**
* irq_setup_alt_chip - Switch to alternative chip
* @d: irq_data for this interrupt
@@ -325,8 +414,13 @@ static int irq_gc_suspend(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;

- if (ct->chip.irq_suspend)
- ct->chip.irq_suspend(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_suspend) {
+ int i;
+ int irq = gc->irq_base;
+ for (i = 0; !irq && i < 32; i++)
+ irq = irq_find_mapping(gc->domain, i);
+ ct->chip.irq_suspend(irq_get_irq_data(irq));
+ }
}
return 0;
}
@@ -338,8 +432,13 @@ static void irq_gc_resume(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;

- if (ct->chip.irq_resume)
- ct->chip.irq_resume(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_resume) {
+ int i;
+ int irq = gc->irq_base;
+ for (i = 0; !irq && i < 32; i++)
+ irq = irq_find_mapping(gc->domain, i);
+ ct->chip.irq_resume(irq_get_irq_data(irq));
+ }
}
}
#else
@@ -354,8 +453,13 @@ static void irq_gc_shutdown(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;

- if (ct->chip.irq_pm_shutdown)
- ct->chip.irq_pm_shutdown(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_pm_shutdown) {
+ int i;
+ int irq = gc->irq_base;
+ for (i = 0; !irq && i < 32; i++)
+ irq = irq_find_mapping(gc->domain, i);
+ ct->chip.irq_pm_shutdown(irq_get_irq_data(irq));
+ }
}
}

--
1.7.5.4


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