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Date: Wed, 21 Nov 2018 08:41:25 +0000
From: Marc Zyngier <marc.zyngier@....com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
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
Cc: 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
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.
> +#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?
> +
> +#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
> +
> +#define RDA_NR_IRQS 32
Surely the mask can be derived from the number of interrupts?
> +
> +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.
> +
> +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.
> +}
> +
> +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;
> + else
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static struct irq_domain *rda_irq_domain;
Please move this to the top of the file, next to "base".
> +
> +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?
> + 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.
> + }
> +
> + 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.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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