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SubjectRe: [PATCH v6 2/4] arm: fiq: Allow EOI to be communicated to the intc
On Tue, 24 Jun 2014, Daniel Thompson wrote:

> Modern ARM systems require an EOI to be sent to the interrupt controller
> on completion of both IRQ and FIQ. The FIQ code currently does not provide
> any API to perform this. This patch provides this API, implemented by
> adding a callback to the fiq_chip structure.
>
> Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
> Cc: Russell King <linux@arm.linux.org.uk>
> Cc: Fabio Estevam <festevam@gmail.com>
> Cc: Nicolas Pitre <nico@linaro.org>

Acked-by: Nicolas Pitre <nico@linaro.org>

> ---
> arch/arm/include/asm/fiq.h | 6 ++++++
> arch/arm/kernel/fiq.c | 9 +++++++++
> 2 files changed, 15 insertions(+)
>
> diff --git a/arch/arm/include/asm/fiq.h b/arch/arm/include/asm/fiq.h
> index a7806ef..e5d9458 100644
> --- a/arch/arm/include/asm/fiq.h
> +++ b/arch/arm/include/asm/fiq.h
> @@ -21,6 +21,11 @@
> struct fiq_chip {
> void (*fiq_enable)(struct irq_data *data);
> void (*fiq_disable)(struct irq_data *data);
> +
> + /* .fiq_eoi() will be called from the FIQ handler. For this
> + * reason it must not use spin locks (or any other locks).
> + */
> + void (*fiq_eoi)(struct irq_data *data);
> };
>
> struct fiq_handler {
> @@ -43,6 +48,7 @@ extern void release_fiq(struct fiq_handler *f);
> extern void set_fiq_handler(void *start, unsigned int length);
> extern void enable_fiq(int fiq);
> extern void disable_fiq(int fiq);
> +extern void eoi_fiq(int fiq);
> extern bool has_fiq(int fiq);
> extern void fiq_register_mapping(int irq, struct fiq_chip *chip);
>
> diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
> index 567f8fd..edde332 100644
> --- a/arch/arm/kernel/fiq.c
> +++ b/arch/arm/kernel/fiq.c
> @@ -183,6 +183,15 @@ void disable_fiq(int fiq)
> disable_irq(fiq + fiq_start);
> }
>
> +void eoi_fiq(int fiq)
> +{
> + struct fiq_data *data = lookup_fiq_data(fiq);
> +
> + if (data && data->fiq_chip->fiq_eoi)
> + data->fiq_chip->fiq_eoi(data->irq_data);
> +}
> +EXPORT_SYMBOL(eoi_fiq);
> +
> bool has_fiq(int fiq)
> {
> struct fiq_data *data = lookup_fiq_data(fiq);
> --
> 1.9.3
>


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