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Subject[PATCH v3 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>
---
arch/arm/mach-rda/Kconfig | 1 +
drivers/irqchip/Kconfig | 4 ++
drivers/irqchip/Makefile | 1 +
drivers/irqchip/irq-rda-intc.c | 107 +++++++++++++++++++++++++++++++++
4 files changed, 113 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..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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