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| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-11-06 22:20:16 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2014-11-23 13:01:46 +0100 |
| commit | 85f08c17de26f117be6ca7aa260d2ec02a2248ba (patch) | |
| tree | 8a3d7091188c77e8fc6534b3db1394a08bba8128 | |
| parent | 0cc01abab6412f3a76256bb57ca58dcb94a6edc7 (diff) | |
| download | linux-85f08c17de26f117be6ca7aa260d2ec02a2248ba.tar.gz linux-85f08c17de26f117be6ca7aa260d2ec02a2248ba.tar.bz2 linux-85f08c17de26f117be6ca7aa260d2ec02a2248ba.zip | |
genirq: Introduce helper functions to support stacked irq_chip
Now we already support hierarchy irq_data, so introduce several helpers
to support stacked irq_chips.
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Yingjoe Chen <yingjoe.chen@mediatek.com>
Cc: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | include/linux/irq.h | 5 | ||||
| -rw-r--r-- | kernel/irq/chip.c | 28 |
2 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 13ba412ce3a0..0adcbbbf2e87 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -443,6 +443,11 @@ extern void handle_percpu_devid_irq(unsigned int irq, struct irq_desc *desc); extern void handle_bad_irq(unsigned int irq, struct irq_desc *desc); extern void handle_nested_irq(unsigned int irq); +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY +extern void irq_chip_ack_parent(struct irq_data *data); +extern int irq_chip_retrigger_hierarchy(struct irq_data *data); +#endif + /* Handling of unhandled and spurious interrupts: */ extern void note_interrupt(unsigned int irq, struct irq_desc *desc, irqreturn_t action_ret); diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 72a93086216b..dd1d3c4c93a2 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -850,3 +850,31 @@ void irq_cpu_offline(void) raw_spin_unlock_irqrestore(&desc->lock, flags); } } + +#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY +/** + * irq_chip_ack_parent - Acknowledge the parent interrupt + * @data: Pointer to interrupt specific data + */ +void irq_chip_ack_parent(struct irq_data *data) +{ + data = data->parent_data; + data->chip->irq_ack(data); +} + +/** + * irq_chip_retrigger_hierarchy - Retrigger an interrupt in hardware + * @data: Pointer to interrupt specific data + * + * Iterate through the domain hierarchy of the interrupt and check + * whether a hw retrigger function exists. If yes, invoke it. + */ +int irq_chip_retrigger_hierarchy(struct irq_data *data) +{ + for (data = data->parent_data; data; data = data->parent_data) + if (data->chip && data->chip->irq_retrigger) + return data->chip->irq_retrigger(data); + + return -ENOSYS; +} +#endif |