Hi Marc,
Thanks for the quick review!
On Mon, Nov 19, 2018 at 05:36:49PM +0000, Marc Zyngier wrote:
> Manivannan,
>
> On 19/11/2018 17:09, Manivannan Sadhasivam wrote:
> > Add interrupt driver for RDA Micro RDA8810PL SoC.
> >
> > Signed-off-by: Andreas Färber <afaerber@xxxxxxx>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
> > ---
> > arch/arm/mach-rda/Kconfig | 1 +
> > drivers/irqchip/Kconfig | 4 ++
> > drivers/irqchip/Makefile | 1 +
> > drivers/irqchip/irq-rda-intc.c | 116 +++++++++++++++++++++++++++++++++
> > 4 files changed, 122 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..89be55a11823
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-rda-intc.c
> > @@ -0,0 +1,116 @@
> > +// 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>
> > +#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
> > +
> > +#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
> > +
> > +#define RDA_NR_IRQS 32
> > +
> > +void __iomem *base;
>
> Should be static?
>
Ack.
> > +
> > +static void rda_intc_mask_irq(struct irq_data *d)
> > +{
> > + void __iomem *base = (void __iomem *)irq_data_get_irq_chip_data(d);
>
> Aliases with the above. Please choose whether you want a global or a
> per-interrupt base.
>
My bad. I wanted to have a global interrupt base for rda_handle_irq.
Will remove the per interrupt base.
> > +
> > + writel(BIT(d->hwirq), base + RDA_INTC_MASK_CLR);
>
> writel_relaxed()
>
Ack.
> > +}
> > +
> > +static void rda_intc_unmask_irq(struct irq_data *d)
> > +{
> > + void __iomem *base = (void __iomem *)irq_data_get_irq_chip_data(d);
> > +
> > + writel(BIT(d->hwirq), base + RDA_INTC_MASK_SET);
>
> Same here.
Ack.
>
> > +}
> > +
> > +static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
> > +{
> > + if (flow_type & (IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING))
> > + irq_set_handler(data->irq, handle_edge_irq);
> > + if (flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW))
> > + irq_set_handler(data->irq, handle_level_irq);
>
> So you don't need to set anything in your interrupt controller for this
> to switch between level and edge? That'd be a first...
>
Interrupt controller can only handle level triggered interrupts. Should
I just remove irq_set_type callback itself?
> > +
> > + return 0;
> > +}
> > +
> > +struct irq_domain *rda_irq_domain;
>
> static?
>
Ack.
> > +
> > +static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
> > +{
> > + u32 stat = readl(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_ack = rda_intc_mask_irq,
>
> You're joking, right? What does it mean to implement both ack as mask
> when you already have mask?
>
Right, but I just followed what other drivers were doing (irq-sa11x0). Will
remove it.
> > + .irq_mask = rda_intc_mask_irq,
> > + .irq_unmask = rda_intc_unmask_irq,
> > + .irq_set_type = rda_intc_set_type,
> > + .irq_disable = rda_intc_mask_irq,
>
> What is this disable for? Implementing enable/disable only makes sense
> if their different implementation differs from mask/unmask (and that
> they add some real value, such as allocating resource).
>
Okay. Will remove this callback also.
> > +};
> > +
> > +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);
>
> The set_type callback is specially puzzling when you set everything to
> be level...
>
As said above, set_type callback will be removed since the hardware
can't handle any other interrupt types.
> > + 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,
>
> ... and don't have any way to express an edge interrupt in DT.
>
Above comment applies here.
> > +};
> > +
> > +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 invalid all interrupt sources
> > + */
> > + writel(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);
> > + WARN_ON(!rda_irq_domain);
>
> Just WARN_ON(), and carry on? Please implement some error handling.
>
Sure. Which one would you recommend? Panic or returning -ENXIO?
Thanks,
Mani
> > +
> > + set_handle_irq(rda_handle_irq);
> > +
> > + return 0;
> > +}
> > +
> > +IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
> >
>
> Thanks,
>
> M.
> --
> Jazz is not dead. It just smells funny...
