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    Subject[PATCH v4 08/15] irqchip: Add RDA8810PL interrupt driver
    Date
    Add interrupt driver for RDA Micro RDA8810PL SoC.

    Signed-off-by: Andreas Färber <afaerber@suse.de>
    Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
    ---
    drivers/irqchip/Kconfig | 4 ++
    drivers/irqchip/Makefile | 1 +
    drivers/irqchip/irq-rda-intc.c | 107 +++++++++++++++++++++++++++++++++
    3 files changed, 112 insertions(+)
    create mode 100644 drivers/irqchip/irq-rda-intc.c

    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..1176291fdef8
    --- /dev/null
    +++ b/drivers/irqchip/irq-rda-intc.c
    @@ -0,0 +1,107 @@
    +// 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/exception.h>
    +
    +#define RDA_INTC_FINALSTATUS 0x00
    +#define RDA_INTC_MASK_SET 0x08
    +#define RDA_INTC_MASK_CLR 0x0c
    +
    +#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
    +
    +#define RDA_NR_IRQS 32
    +
    +static void __iomem *rda_intc_base;
    +static struct irq_domain *rda_irq_domain;
    +
    +static void rda_intc_mask_irq(struct irq_data *d)
    +{
    + writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_CLR);
    +}
    +
    +static void rda_intc_unmask_irq(struct irq_data *d)
    +{
    + writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_SET);
    +}
    +
    +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)) == flow_type)
    + return 0;
    +
    + return -EINVAL;
    +}
    +
    +static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
    +{
    + u32 stat = readl_relaxed(rda_intc_base + RDA_INTC_FINALSTATUS);
    + u32 hwirq;
    +
    + while (stat) {
    + hwirq = __fls(stat);
    + handle_domain_irq(rda_irq_domain, hwirq, regs);
    + stat &= ~BIT(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)
    +{
    + rda_intc_base = of_io_request_and_map(node, 0, "rda-intc");
    + if (!rda_intc_base)
    + return -ENXIO;
    +
    + /* Mask all interrupt sources */
    + writel_relaxed(RDA_IRQ_MASK_ALL, rda_intc_base + RDA_INTC_MASK_CLR);
    +
    + rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
    + &rda_irq_domain_ops,
    + rda_intc_base);
    + if (!rda_irq_domain) {
    + iounmap(rda_intc_base);
    + return -ENOMEM;
    + }
    +
    + set_handle_irq(rda_handle_irq);
    +
    + return 0;
    +}
    +
    +IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
    --
    2.17.1
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