From mboxrd@z Thu Jan 1 00:00:00 1970 From: eric@anholt.net (Eric Anholt) Date: Mon, 13 Jul 2015 11:48:57 -0700 Subject: [PATCH 4/4] irqchip: Add bcm2836 interrupt controller for Raspberry Pi 2. In-Reply-To: <55A0A5EB.4090007@wwwdotorg.org> References: <1436303617-17185-1-git-send-email-eric@anholt.net> <1436303617-17185-5-git-send-email-eric@anholt.net> <55A0A5EB.4090007@wwwdotorg.org> Message-ID: <87bnffao6e.fsf@eliezer.anholt.net> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Stephen Warren writes: > On 07/07/2015 03:13 PM, Eric Anholt wrote: >> This interrupt controller is the new root interrupt controller with >> the timer, PMU events, and IPIs, and the bcm2835's interrupt >> controller is chained off of it to handle the peripherals. >> >> SMP IPI support was mostly written by Andrea Merello, while I wrote >> most of the rest of the IRQ handling. >> >> Signed-off-by: Andrea Merello >> Signed-off-by: Eric Anholt > > I'd expect the git patch author to be Andrea if he wrote the original > patch and you enhanced it. I wrote the IRQs patch, and Andrea added the IPI bits to it. >> diff --git a/drivers/irqchip/irq-bcm2836.c b/drivers/irqchip/irq-bcm2836.c > >> +struct arm_local_intc { >> + struct irq_domain *domain; >> + void __iomem *base; >> +}; >> + >> +static struct arm_local_intc intc __read_mostly; > > It'd be nice to give everything (types, functions, variables) a > consistent symbol prefix; bcm2836_arm_irqchip_ sounds like a good > bikeshed to me, but perhaps just propagating the above arm_local_ to the > functions too would be good, although that seems to risk symbol name > collisions with other ARM SoCs. Done. >> +static void bcm2836_mask_gpu_irq(struct irq_data *d) >> +{ >> +} >> + >> +static void bcm2836_unmask_gpu_irq(struct irq_data *d) >> +{ >> +} > > If the IRQs can't be masked, should these functions actually be implemented? They are called unconditionally at IRQ enable time. I don't see a way to mask them. >> +static void __exception_irq_entry bcm2836_handle_irq(struct pt_regs *regs) >> +{ >> + int cpu = smp_processor_id(); >> + u32 stat; >> + >> + stat = readl_relaxed(intc.base + LOCAL_IRQ_PENDING0 + 4 * cpu); >> + if (stat & 0x10) { >> + void __iomem *mailbox0 = (intc.base + >> + LOCAL_MAILBOX0_CLR0 + 16 * cpu); >> + u32 mbox_val = readl(mailbox0); >> + u32 ipi = ffs(mbox_val) - 1; >> + >> + writel(1 << ipi, mailbox0); >> + handle_IPI(ipi, regs); > > Given that bcm2836_send_ipi() is #ifdef CONFIG_SMP, should this code be too? Sure, done. -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 818 bytes Desc: not available URL: