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Date: Wed, 17 Sep 2014 10:14:33 -0700
From: Andrew Bresticker <abrestic@...omium.org>
To: Qais Yousef <qais.yousef@...tec.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>,
Thomas Gleixner <tglx@...utronix.de>,
Jason Cooper <jason@...edaemon.net>,
Jeffrey Deans <jeffrey.deans@...tec.com>,
Markos Chandras <markos.chandras@...tec.com>,
Paul Burton <paul.burton@...tec.com>,
Jonas Gorski <jogo@...nwrt.org>,
John Crispin <blogic@...nwrt.org>,
David Daney <ddaney.cavm@...il.com>,
Linux-MIPS <linux-mips@...ux-mips.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/24] irqchip: mips-gic: Implement generic
irq_ack/irq_eoi callbacks
On Wed, Sep 17, 2014 at 2:14 AM, Qais Yousef <qais.yousef@...tec.com> wrote:
> Hi Andrew,
>
>
> On 09/16/2014 12:51 AM, Andrew Bresticker wrote:
>>
>> There's no need for platforms to have their own GIC irq_ack/irq_eoi
>> callbacks. Move them to the GIC irqchip driver.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
>> ---
>> arch/mips/include/asm/gic.h | 2 --
>> arch/mips/mti-malta/malta-int.c | 16 ----------------
>> arch/mips/mti-sead3/sead3-int.c | 21 ---------------------
>> drivers/irqchip/irq-mips-gic.c | 15 ++++++++++++---
>> 4 files changed, 12 insertions(+), 42 deletions(-)
>>
>> diff --git a/arch/mips/include/asm/gic.h b/arch/mips/include/asm/gic.h
>> index 022d831..1bf7985 100644
>> --- a/arch/mips/include/asm/gic.h
>> +++ b/arch/mips/include/asm/gic.h
>> @@ -376,7 +376,5 @@ extern void gic_bind_eic_interrupt(int irq, int set);
>> extern unsigned int gic_get_timer_pending(void);
>> extern void gic_get_int_mask(unsigned long *dst, const unsigned long
>> *src);
>> extern unsigned int gic_get_int(void);
>> -extern void gic_irq_ack(struct irq_data *d);
>> -extern void gic_finish_irq(struct irq_data *d);
>> extern void gic_platform_init(int irqs, struct irq_chip
>> *irq_controller);
>> #endif /* _ASM_GICREGS_H */
>> diff --git a/arch/mips/mti-malta/malta-int.c
>> b/arch/mips/mti-malta/malta-int.c
>> index 5c31208..b60adfd 100644
>> --- a/arch/mips/mti-malta/malta-int.c
>> +++ b/arch/mips/mti-malta/malta-int.c
>> @@ -715,22 +715,6 @@ int malta_be_handler(struct pt_regs *regs, int
>> is_fixup)
>> return retval;
>> }
>> -void gic_irq_ack(struct irq_data *d)
>> -{
>> - int irq = (d->irq - gic_irq_base);
>> -
>> - GIC_CLR_INTR_MASK(irq);
>> -
>> - if (gic_irq_flags[irq] & GIC_TRIG_EDGE)
>> - GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
>> -}
>> -
>> -void gic_finish_irq(struct irq_data *d)
>> -{
>> - /* Enable interrupts. */
>> - GIC_SET_INTR_MASK(d->irq - gic_irq_base);
>> -}
>> -
>> void __init gic_platform_init(int irqs, struct irq_chip *irq_controller)
>> {
>> int i;
>> diff --git a/arch/mips/mti-sead3/sead3-int.c
>> b/arch/mips/mti-sead3/sead3-int.c
>> index 9d5b5bd..03f9865 100644
>> --- a/arch/mips/mti-sead3/sead3-int.c
>> +++ b/arch/mips/mti-sead3/sead3-int.c
>> @@ -85,27 +85,6 @@ void __init arch_init_irq(void)
>> ARRAY_SIZE(gic_intr_map), MIPS_GIC_IRQ_BASE);
>> }
>> -void gic_irq_ack(struct irq_data *d)
>> -{
>> - GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
>> -}
>> -
>> -void gic_finish_irq(struct irq_data *d)
>> -{
>> - unsigned int irq = (d->irq - gic_irq_base);
>> - unsigned int i, irq_source;
>> -
>> - /* Clear edge detectors. */
>> - for (i = 0; i < gic_shared_intr_map[irq].num_shared_intr; i++) {
>> - irq_source = gic_shared_intr_map[irq].intr_list[i];
>> - if (gic_irq_flags[irq_source] & GIC_TRIG_EDGE)
>> - GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE),
>> irq_source);
>> - }
>> -
>> - /* Enable interrupts. */
>> - GIC_SET_INTR_MASK(irq);
>> -}
>> -
>> void __init gic_platform_init(int irqs, struct irq_chip *irq_controller)
>> {
>> int i;
>> diff --git a/drivers/irqchip/irq-mips-gic.c
>> b/drivers/irqchip/irq-mips-gic.c
>> index 9e9d8b9..0dc2972 100644
>> --- a/drivers/irqchip/irq-mips-gic.c
>> +++ b/drivers/irqchip/irq-mips-gic.c
>> @@ -237,6 +237,15 @@ static void gic_unmask_irq(struct irq_data *d)
>> GIC_SET_INTR_MASK(d->irq - gic_irq_base);
>> }
>> +static void gic_ack_irq(struct irq_data *d)
>> +{
>> + GIC_CLR_INTR_MASK(d->irq - gic_irq_base);
>> +
>> + /* Clear edge detector */
>> + if (gic_irq_flags[d->irq - gic_irq_base] & GIC_TRIG_EDGE)
>> + GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), d->irq -
>> gic_irq_base);
>> +}
>> +
>> #ifdef CONFIG_SMP
>> static DEFINE_SPINLOCK(gic_lock);
>> @@ -272,11 +281,11 @@ static int gic_set_affinity(struct irq_data *d,
>> const struct cpumask *cpumask,
>> static struct irq_chip gic_irq_controller = {
>> .name = "MIPS GIC",
>> - .irq_ack = gic_irq_ack,
>> + .irq_ack = gic_ack_irq,
>> .irq_mask = gic_mask_irq,
>> - .irq_mask_ack = gic_mask_irq,
>> + .irq_mask_ack = gic_ack_irq,
>> .irq_unmask = gic_unmask_irq,
>> - .irq_eoi = gic_finish_irq,
>> + .irq_eoi = gic_unmask_irq,
>> #ifdef CONFIG_SMP
>> .irq_set_affinity = gic_set_affinity,
>> #endif
>
>
> I'm no expert in irq_chip api but I think providing irq_mask_ack and irq_eoi
> makes no sense to GIC and can be removed.
Ok, yeah, I think both irq_mask_ack and irq_eoi can go away here.
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