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Message-ID: <20181121174017.GA4411@Mani-XPS-13-9360>
Date: Wed, 21 Nov 2018 23:11:02 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Marc Zyngier <marc.zyngier@....com>
Cc: olof@...om.net, arnd@...db.de, robh+dt@...nel.org,
tglx@...utronix.de, jason@...edaemon.net,
daniel.lezcano@...aro.org, gregkh@...uxfoundation.org,
jslaby@...e.com, afaerber@...e.de,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, linux-serial@...r.kernel.org,
amit.kucheria@...aro.org, linus.walleij@...aro.org,
zhao_steven@....net, overseas.sales@...soc.com
Subject: Re: [PATCH v2 08/15] irqchip: Add RDA8810PL interrupt driver
Hi Marc,
On Wed, Nov 21, 2018 at 08:41:25AM +0000, Marc Zyngier wrote:
> On 21/11/2018 03:36, Manivannan Sadhasivam wrote:
> > Add interrupt driver for RDA Micro RDA8810PL SoC.
> >
> > Signed-off-by: Andreas Färber <afaerber@...e.de>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> > arch/arm/mach-rda/Kconfig | 1 +
> > drivers/irqchip/Kconfig | 4 ++
> > drivers/irqchip/Makefile | 1 +
> > drivers/irqchip/irq-rda-intc.c | 113 +++++++++++++++++++++++++++++++++
> > 4 files changed, 119 insertions(+)
> > create mode 100644 drivers/irqchip/irq-rda-intc.c
> >
> > diff --git a/arch/arm/mach-rda/Kconfig b/arch/arm/mach-rda/Kconfig
> > index dafab78d7aab..29012bc68ca4 100644
> > --- a/arch/arm/mach-rda/Kconfig
> > +++ b/arch/arm/mach-rda/Kconfig
> > @@ -3,5 +3,6 @@ menuconfig ARCH_RDA
> > depends on ARCH_MULTI_V7
> > select COMMON_CLK
> > select GENERIC_IRQ_CHIP
> > + select RDA_INTC
> > help
> > This enables support for the RDA Micro 8810PL SoC family.
> > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> > index 51a5ef0e96ed..9d54645870ad 100644
> > --- a/drivers/irqchip/Kconfig
> > +++ b/drivers/irqchip/Kconfig
> > @@ -195,6 +195,10 @@ config JCORE_AIC
> > help
> > Support for the J-Core integrated AIC.
> >
> > +config RDA_INTC
> > + bool
> > + select IRQ_DOMAIN
> > +
> > config RENESAS_INTC_IRQPIN
> > bool
> > select IRQ_DOMAIN
> > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> > index 794c13d3ac3d..417108027e40 100644
> > --- a/drivers/irqchip/Makefile
> > +++ b/drivers/irqchip/Makefile
> > @@ -43,6 +43,7 @@ obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o
> > obj-$(CONFIG_IRQ_MIPS_CPU) += irq-mips-cpu.o
> > obj-$(CONFIG_SIRF_IRQ) += irq-sirfsoc.o
> > obj-$(CONFIG_JCORE_AIC) += irq-jcore-aic.o
> > +obj-$(CONFIG_RDA_INTC) += irq-rda-intc.o
> > obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o
> > obj-$(CONFIG_RENESAS_IRQC) += irq-renesas-irqc.o
> > obj-$(CONFIG_VERSATILE_FPGA_IRQ) += irq-versatile-fpga.o
> > diff --git a/drivers/irqchip/irq-rda-intc.c b/drivers/irqchip/irq-rda-intc.c
> > new file mode 100644
> > index 000000000000..1b372bdb23bc
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-rda-intc.c
> > @@ -0,0 +1,113 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * RDA8810PL SoC irqchip driver
> > + *
> > + * Copyright RDA Microelectronics Company Limited
> > + * Copyright (c) 2017 Andreas Färber
> > + * Copyright (c) 2018 Manivannan Sadhasivam
> > + */
> > +
> > +#include <linux/init.h>
> > +#include <linux/interrupt.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqchip.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/of_address.h>
> > +
> > +#include <asm/irq.h>
>
> You shouldn't need to include this.
>
Ack.
> > +#include <asm/exception.h>
> > +
> > +#define RDA_INTC_FINALSTATUS 0x00
> > +#define RDA_INTC_STATUS 0x04
> > +#define RDA_INTC_MASK_SET 0x08
> > +#define RDA_INTC_MASK_CLR 0x0c
> > +#define RDA_INTC_WAKEUP_MASK 0x18
> > +#define RDA_INTC_CPU_SLEEP 0x1c
>
> Half of these constants are unused. Do we really need them?
>
Usually I tend to define all registers to provide overall reg map. But
I have no issues to remove the not used ones.
> > +
> > +#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
> > +
> > +#define RDA_NR_IRQS 32
>
> Surely the mask can be derived from the number of interrupts?
>
Why not? Since each bit corresponds to a single interrupt, 0xFFFFFFFF
can cover all 32 bits which is equal to the total number of interrupts
supported by the controller. Am I missing anything here?
> > +
> > +static void __iomem *base;
>
> Everything in this driver is prefixed with rda_. It would seem valuable
> to do the same here, as "base" is a bit too generic.
>
Ack.
> > +
> > +static void rda_intc_mask_irq(struct irq_data *d)
> > +{
> > + writel_relaxed(BIT(d->hwirq), base + RDA_INTC_MASK_CLR);
> > +}
> > +
> > +static void rda_intc_unmask_irq(struct irq_data *d)
> > +{
> > + writel_relaxed(BIT(d->hwirq), base + RDA_INTC_MASK_SET);
>
> Are the names MASK_CLR and MASK_SET from the datasheet? They seem to be
> backward (you set the mask to unmask...), and seem to behave like an
> enable instead. That's not a big issue, just curious.
>
Yes, this naming convention comes from the datasheet and it is a bit
wierd as you said ;-)
> > +}
> > +
> > +static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
> > +{
> > + /* Hardware supports only level triggered interrupts */
> > + if (flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW))
> > + irq_set_handler(data->irq, handle_level_irq);
>
> Why do you need to do this? You've already configured it at map time,
> and it is not changing under your feet. This should be written as:
>
> if ((flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) == flow_type)
> return 0;
>
> return -EINVAL;
>
Okay.
> > + else
> > + return -EINVAL;
> > +
> > + return 0;
> > +}
> > +
> > +static struct irq_domain *rda_irq_domain;
>
> Please move this to the top of the file, next to "base".
>
Ack.
> > +
> > +static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
> > +{
> > + u32 stat = readl_relaxed(base + RDA_INTC_FINALSTATUS);
> > + u32 hwirq;
> > +
> > + while (stat) {
> > + hwirq = __fls(stat);
> > + handle_domain_irq(rda_irq_domain, hwirq, regs);
> > + stat &= ~(1 << hwirq);
> > + }
> > +}
> > +
> > +static struct irq_chip rda_irq_chip = {
> > + .name = "rda-intc",
> > + .irq_mask = rda_intc_mask_irq,
> > + .irq_unmask = rda_intc_unmask_irq,
> > + .irq_set_type = rda_intc_set_type,
> > +};
> > +
> > +static int rda_irq_map(struct irq_domain *d,
> > + unsigned int virq, irq_hw_number_t hw)
> > +{
> > + irq_set_status_flags(virq, IRQ_LEVEL);
> > + irq_set_chip_and_handler(virq, &rda_irq_chip, handle_level_irq);
> > + irq_set_chip_data(virq, d->host_data);
> > + irq_set_probe(virq);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct irq_domain_ops rda_irq_domain_ops = {
> > + .map = rda_irq_map,
> > + .xlate = irq_domain_xlate_onecell,
> > +};
> > +
> > +static int __init rda8810_intc_init(struct device_node *node,
> > + struct device_node *parent)
> > +{
> > + base = of_io_request_and_map(node, 0, "rda-intc");
> > + if (!base)
> > + return -ENXIO;
> > +
> > + /* Mask, and invalidate all interrupt sources */
>
> What does "invalidate" mean here?
>
Mean to say "disable" but yeah not appropriate. Will remove it.
> > + writel_relaxed(RDA_IRQ_MASK_ALL, base + RDA_INTC_MASK_CLR);
> > +
> > + rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
> > + &rda_irq_domain_ops, base);
> > + if (WARN_ON(!rda_irq_domain)) {
> > + iounmap(base);
> > + return -ENODEV;
>
> Why ENODEV? ENOMEM seems more appropriate. The WARN_ON is a bit
> superfluous, as the failing probe should be noisy enough.
>
Ack. ENOMEM comes from your suggestion in previous review.
> > + }
> > +
> > + set_handle_irq(rda_handle_irq);
> > +
> > + return 0;
> > +}
> > +
> > +IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
> >
>
> You've already posted two versions in 3 days, please allow for a week
> between versions.
>
Sorry for that. I thought the other way, allowing too much delay would
hinder the review process. Will post the next revision after few more days.
Thanks,
Mani
> Thanks,
>
> M.
> --
> Jazz is not dead. It just smells funny...
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