[PATCH v6] irq: add irq_domain support to generic-chip
Rob Herring
robherring2 at gmail.com
Wed Feb 8 17:55:22 EST 2012
From: Rob Herring <rob.herring at 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.
Thanks to Shawn Guo for fixes and testing.
Signed-off-by: Rob Herring <rob.herring at calxeda.com>
Cc: Grant Likely <grant.likely at secretlab.ca>
Cc: Thomas Gleixner <tglx at linutronix.de>
---
Here's the latest version. This has fixes from Shawn Guo, so should be
working. This version is also available here:
git://sources.calxeda.com/kernel/linux.git pl061-domain-v6.
include/linux/irq.h | 15 +++++
kernel/irq/generic-chip.c | 152 ++++++++++++++++++++++++++++++++++++++-------
2 files changed, 145 insertions(+), 22 deletions(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index bff29c5..d721abc 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -664,7 +664,12 @@ struct irq_chip_generic {
raw_spinlock_t lock;
void __iomem *reg_base;
unsigned int irq_base;
+ unsigned int hwirq_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 +712,16 @@ 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;
+int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
+ int num_ct, unsigned int irq_base,
+ void __iomem *reg_base,
+ irq_flow_handler_t handler, u32 hwirq_cnt,
+ enum irq_gc_flags flags,
+ unsigned int clr, unsigned int set,
+ void (*gc_init_cb)(struct irq_chip_generic *),
+ void *private);
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..3ac7fa1 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 % 32);
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 % 32);
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 % 32);
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 % 32);
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 % 32);
irq_gc_lock(gc);
irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
@@ -122,10 +123,10 @@ 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 % 32);
irq_gc_lock(gc);
- irq_reg_writel(mask, gc->reg_base + cur_regs(d)->ack);
+ irq_reg_writel(~mask, gc->reg_base + cur_regs(d)->ack);
irq_gc_unlock(gc);
}
@@ -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 % 32);
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 % 32);
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 % 32);
if (!(mask & gc->wake_enabled))
return -EINVAL;
@@ -220,6 +221,18 @@ EXPORT_SYMBOL_GPL(irq_alloc_generic_chip);
*/
static struct lock_class_key irq_nested_lock_class;
+static void irq_gc_setup_irq(struct irq_chip_generic *gc, int irq)
+{
+ 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);
+}
+
/**
* irq_setup_generic_chip - Setup a range of interrupts with a generic chip
* @gc: Generic irq chip holding all data
@@ -247,21 +260,113 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
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;
+
for (i = gc->irq_base; msk; msk >>= 1, i++) {
if (!(msk & 0x01))
continue;
- if (flags & IRQ_GC_INIT_NESTED_LOCK)
- irq_set_lockdep_class(i, &irq_nested_lock_class);
-
- irq_set_chip_and_handler(i, &ct->chip, ct->handler);
- irq_set_chip_data(i, gc);
- irq_modify_status(i, clr, set);
+ irq_gc_setup_irq(gc, i);
+ 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_map(struct irq_domain *d, unsigned int irq,
+ irq_hw_number_t hw)
+{
+ struct irq_chip_generic **gc_array = d->host_data;
+ struct irq_chip_generic *gc = gc_array[hw / 32];
+
+ /* We need a valid irq number for suspend/resume functions */
+ if ((int)gc->irq_base == -1)
+ gc->irq_base = irq;
+ irq_gc_setup_irq(gc, irq);
+ return 0;
+}
+
+static const struct irq_domain_ops irq_gc_irq_domain_ops = {
+ .map = irq_gc_irq_domain_map,
+ .xlate = irq_domain_xlate_onetwocell,
+};
+
+/*
+ * irq_setup_generic_chip_domain - Setup a domain and N generic chips
+ * @name: Name of the irq chip
+ * @node: Device tree node pointer for domain
+ * @num_ct: Number of irq_chip_type instances associated with this
+ * @irq_base: Interrupt base nr for this chip
+ * @reg_base: Register base address (virtual)
+ * @handler: Default flow handler associated with this chip
+ * @hwirq_cnt: Number of hw irqs for the domain
+ * @flags: Flags for initialization
+ * @clr: IRQ_* bits to clear
+ * @set: IRQ_* bits to set
+ * @gc_init_cb: Init callback function called for each generic irq chip created
+ * @private Ptr to caller private data
+ *
+ * Set up an irq domain and N banks of 32 interrupts starting from gc->irq_base.
+ * Note, this initializes all interrupts to the primary irq_chip_type and its
+ * associated handler.
+ */
+int irq_setup_generic_chip_domain(const char *name, struct device_node *node,
+ int num_ct, unsigned int irq_base,
+ void __iomem *reg_base,
+ irq_flow_handler_t handler, u32 hwirq_cnt,
+ enum irq_gc_flags flags, unsigned int clr,
+ unsigned int set,
+ void (*gc_init_cb)(struct irq_chip_generic *),
+ void *private)
+{
+ int ret, i;
+ struct irq_chip_generic **gc;
+ struct irq_domain *d;
+ int num_gc = ALIGN(hwirq_cnt, 32) / 32;
+
+ gc = kzalloc(num_gc * sizeof(struct irq_chip_generic *), GFP_KERNEL);
+ if (!gc)
+ return -ENOMEM;
+
+ for (i = 0; i < num_gc; i++) {
+ gc[i] = irq_alloc_generic_chip(name, num_ct, irq_base,
+ reg_base, handler);
+ if (!gc[i]) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ gc[i]->hwirq_base = i * 32;
+ gc[i]->private = private;
+
+ gc_init_cb(gc[i]);
+
+ irq_setup_generic_chip(gc[i], 0, flags, clr, set);
+ }
+
+ if (node)
+ d = irq_domain_add_linear(node, hwirq_cnt,
+ &irq_gc_irq_domain_ops, gc);
+ else
+ d = irq_domain_add_legacy(node, hwirq_cnt, irq_base, 0,
+ &irq_gc_irq_domain_ops, gc);
+
+ for (i = 0; i < num_gc; i++)
+ gc[i]->domain = d;
+
+ return 0;
+
+ err:
+ for ( ; i >= 0; i--)
+ kfree(gc[i]);
+ kfree(gc);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(irq_setup_generic_chip_domain);
+#endif
+
/**
* irq_setup_alt_chip - Switch to alternative chip
* @d: irq_data for this interrupt
@@ -324,9 +429,10 @@ static int irq_gc_suspend(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
+ struct irq_data *data = irq_get_irq_data(gc->irq_base);
- if (ct->chip.irq_suspend)
- ct->chip.irq_suspend(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_suspend && data)
+ ct->chip.irq_suspend(data);
}
return 0;
}
@@ -337,9 +443,10 @@ static void irq_gc_resume(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
+ struct irq_data *data = irq_get_irq_data(gc->irq_base);
- if (ct->chip.irq_resume)
- ct->chip.irq_resume(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_resume && data)
+ ct->chip.irq_resume(data);
}
}
#else
@@ -353,9 +460,10 @@ static void irq_gc_shutdown(void)
list_for_each_entry(gc, &gc_list, list) {
struct irq_chip_type *ct = gc->chip_types;
+ struct irq_data *data = irq_get_irq_data(gc->irq_base);
- if (ct->chip.irq_pm_shutdown)
- ct->chip.irq_pm_shutdown(irq_get_irq_data(gc->irq_base));
+ if (ct->chip.irq_pm_shutdown && data)
+ ct->chip.irq_pm_shutdown(data);
}
}
--
1.7.5.4
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