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Subject[PATCH 04/11] x86/dtb: add irq host abstraction
Date
The here introduced irq_host abstraction represents a generic irq_host.
The xlate callback is resposible to parse irq informations like irq type
and number and returns the hardware irq number which is reported by the
hardware as active.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
CC: x86@kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Tested-by: Dirk Brandewie <dirk.brandewie@gmail.com>
---
arch/x86/include/asm/irq_controller.h | 12 ++++++++
arch/x86/include/asm/prom.h | 2 +
arch/x86/kernel/prom.c | 47 ++++++++++++++++++++++++++++++++-
3 files changed, 60 insertions(+), 1 deletions(-)
create mode 100644 arch/x86/include/asm/irq_controller.h
diff --git a/arch/x86/include/asm/irq_controller.h b/arch/x86/include/asm/irq_controller.h
new file mode 100644
index 0000000..1cbbfd0
--- /dev/null
+++ b/arch/x86/include/asm/irq_controller.h
@@ -0,0 +1,12 @@
+#ifndef __IRQ_CONTROLLER__
+#define __IRQ_CONTROLLER__
+
+struct irq_host {
+ int (*xlate)(struct irq_host *h, const u32 *intspec, u32 intsize,
+ u32 *out_hwirq, u32 *out_type);
+ void *priv;
+ struct device_node *controller;
+ struct list_head l;
+};
+
+#endif
diff --git a/arch/x86/include/asm/prom.h b/arch/x86/include/asm/prom.h
index 8fdb0d2..6c80e53 100644
--- a/arch/x86/include/asm/prom.h
+++ b/arch/x86/include/asm/prom.h
@@ -20,10 +20,12 @@
#include <asm/irq.h>
#include <asm/atomic.h>
#include <asm/setup.h>
+#include <asm/irq_controller.h>

#ifdef CONFIG_OF
extern void init_dtb(void);
extern void add_dtb(u64 data);
+void add_interrupt_host(struct irq_host *ih);
#else
static inline void init_dtb(void) { }
static inline void add_dtb(u64 data) { }
diff --git a/arch/x86/kernel/prom.c b/arch/x86/kernel/prom.c
index ba9a096..996fd05 100644
--- a/arch/x86/kernel/prom.c
+++ b/arch/x86/kernel/prom.c
@@ -3,18 +3,63 @@
*/

#include <linux/io.h>
+#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/slab.h>

+#include <asm/irq_controller.h>
+
char __initdata cmd_line[COMMAND_LINE_SIZE];
+static LIST_HEAD(irq_hosts);
+static DEFINE_RAW_SPINLOCK(big_irq_lock);
+
+void add_interrupt_host(struct irq_host *ih)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&big_irq_lock, flags);
+ list_add(&ih->l, &irq_hosts);
+ raw_spin_unlock_irqrestore(&big_irq_lock, flags);
+}
+
+static struct irq_host *get_ih_from_node(struct device_node *controller)
+{
+ struct irq_host *ih, *found = NULL;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&big_irq_lock, flags);
+ list_for_each_entry(ih, &irq_hosts, l) {
+ if (ih->controller == controller) {
+ found = ih;
+ break;
+ }
+ }
+ raw_spin_unlock_irqrestore(&big_irq_lock, flags);
+ return found;
+}

unsigned int irq_create_of_mapping(struct device_node *controller,
const u32 *intspec, unsigned int intsize)
{
- return intspec[0];
+ struct irq_host *ih;
+ u32 virq;
+ u32 type;
+ int ret;

+ ih = get_ih_from_node(controller);
+ if (!ih)
+ return -ENODEV;
+ ret = ih->xlate(ih, intspec, intsize, &virq, &type);
+ if (ret)
+ return ret;
+ if (type == IRQ_TYPE_NONE)
+ return virq;
+ /* set the mask if it is different from current */
+ if (type == (irq_to_desc(virq)->status & IRQF_TRIGGER_MASK))
+ set_irq_type(virq, type);
+ return virq;
}
EXPORT_SYMBOL_GPL(irq_create_of_mapping);

--
1.7.3.2


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