irqchip: add DesignWare APB ICTL interrupt controller

This adds an irqchip driver and corresponding devicetree binding for the
secondary interrupt controllers based on Synopsys DesignWare IP dw_apb_ictl.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Jisheng Zhang <jszhang@marvell.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed, 187 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt b/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt
new file mode 100644
index 000000000000..492911744ca3
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/snps,dw-apb-ictl.txt
@@ -0,0 +1,32 @@
+Synopsys DesignWare APB interrupt controller (dw_apb_ictl)
+
+Synopsys DesignWare provides interrupt controller IP for APB known as
+dw_apb_ictl. The IP is used as secondary interrupt controller in some SoCs with
+APB bus, e.g. Marvell Armada 1500.
+
+Required properties:
+- compatible: shall be "snps,dw-apb-ictl"
+- reg: physical base address of the controller and length of memory mapped
+  region starting with ENABLE_LOW register
+- interrupt-controller: identifies the node as an interrupt controller
+- #interrupt-cells: number of cells to encode an interrupt-specifier, shall be 1
+- interrupts: interrupt reference to primary interrupt controller
+- interrupt-parent: (optional) reference specific primary interrupt controller
+
+The interrupt sources map to the corresponding bits in the interrupt
+registers, i.e.
+- 0 maps to bit 0 of low interrupts,
+- 1 maps to bit 1 of low interrupts,
+- 32 maps to bit 0 of high interrupts,
+- 33 maps to bit 1 of high interrupts,
+- (optional) fast interrupts start at 64.
+
+Example:
+        aic: interrupt-controller@3000 {
+                compatible = "snps,dw-apb-ictl";
+                reg = <0x3000 0xc00>;
+                interrupt-controller;
+                #interrupt-cells = <1>;
+                interrupt-parent = <&gic>;
+                interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
+        };
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 3792a1aa52b8..940638ddc982 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -30,6 +30,10 @@ config ARM_VIC_NR
           The maximum number of VICs available in the system, for
           power management.
 
+config DW_APB_ICTL
+        bool
+        select IRQ_DOMAIN
+
 config IMGPDC_IRQ
         bool
         select GENERIC_IRQ_CHIP
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index c60b9010b152..6427323af4c3 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_ARCH_MMP)			+= irq-mmp.o
 obj-$(CONFIG_ARCH_MVEBU)                += irq-armada-370-xp.o
 obj-$(CONFIG_ARCH_MXS)                  += irq-mxs.o
 obj-$(CONFIG_ARCH_S3C24XX)              += irq-s3c24xx.o
+obj-$(CONFIG_DW_APB_ICTL)               += irq-dw-apb-ictl.o
 obj-$(CONFIG_METAG)                     += irq-metag-ext.o
 obj-$(CONFIG_METAG_PERFCOUNTER_IRQS)    += irq-metag.o
 obj-$(CONFIG_ARCH_MOXART)               += irq-moxart.o
diff --git a/drivers/irqchip/irq-dw-apb-ictl.c b/drivers/irqchip/irq-dw-apb-ictl.c
new file mode 100644
index 000000000000..31e231e1f566
--- /dev/null
+++ b/drivers/irqchip/irq-dw-apb-ictl.c
@@ -0,0 +1,150 @@
+/*
+ * Synopsys DW APB ICTL irqchip driver.
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *
+ * based on GPL'ed 2.6 kernel sources
+ *  (c) Marvell International Ltd.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+
+#include "irqchip.h"
+
+#define APB_INT_ENABLE_L        0x00
+#define APB_INT_ENABLE_H        0x04
+#define APB_INT_MASK_L          0x08
+#define APB_INT_MASK_H          0x0c
+#define APB_INT_FINALSTATUS_L   0x30
+#define APB_INT_FINALSTATUS_H   0x34
+
+static void dw_apb_ictl_handler(unsigned int irq, struct irq_desc *desc)
+{
+        struct irq_chip *chip = irq_get_chip(irq);
+        struct irq_chip_generic *gc = irq_get_handler_data(irq);
+        struct irq_domain *d = gc->private;
+        u32 stat;
+        int n;
+
+        chained_irq_enter(chip, desc);
+
+        for (n = 0; n < gc->num_ct; n++) {
+                stat = readl_relaxed(gc->reg_base +
+                                     APB_INT_FINALSTATUS_L + 4 * n);
+                while (stat) {
+                        u32 hwirq = ffs(stat) - 1;
+                        generic_handle_irq(irq_find_mapping(d,
+                                            gc->irq_base + hwirq + 32 * n));
+                        stat &= ~(1 << hwirq);
+                }
+        }
+
+        chained_irq_exit(chip, desc);
+}
+
+static int __init dw_apb_ictl_init(struct device_node *np,
+                                   struct device_node *parent)
+{
+        unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+        struct resource r;
+        struct irq_domain *domain;
+        struct irq_chip_generic *gc;
+        void __iomem *iobase;
+        int ret, nrirqs, irq;
+        u32 reg;
+
+        /* Map the parent interrupt for the chained handler */
+        irq = irq_of_parse_and_map(np, 0);
+        if (irq <= 0) {
+                pr_err("%s: unable to parse irq\n", np->full_name);
+                return -EINVAL;
+        }
+
+        ret = of_address_to_resource(np, 0, &r);
+        if (ret) {
+                pr_err("%s: unable to get resource\n", np->full_name);
+                return ret;
+        }
+
+        if (!request_mem_region(r.start, resource_size(&r), np->full_name)) {
+                pr_err("%s: unable to request mem region\n", np->full_name);
+                return -ENOMEM;
+        }
+
+        iobase = ioremap(r.start, resource_size(&r));
+        if (!iobase) {
+                pr_err("%s: unable to map resource\n", np->full_name);
+                ret = -ENOMEM;
+                goto err_release;
+        }
+
+        /*
+         * DW IP can be configured to allow 2-64 irqs. We can determine
+         * the number of irqs supported by writing into enable register
+         * and look for bits not set, as corresponding flip-flops will
+         * have been removed by sythesis tool.
+         */
+
+        /* mask and enable all interrupts */
+        writel(~0, iobase + APB_INT_MASK_L);
+        writel(~0, iobase + APB_INT_MASK_H);
+        writel(~0, iobase + APB_INT_ENABLE_L);
+        writel(~0, iobase + APB_INT_ENABLE_H);
+
+        reg = readl(iobase + APB_INT_ENABLE_H);
+        if (reg)
+                nrirqs = 32 + fls(reg);
+        else
+                nrirqs = fls(readl(iobase + APB_INT_ENABLE_L));
+
+        domain = irq_domain_add_linear(np, nrirqs,
+                                       &irq_generic_chip_ops, NULL);
+        if (!domain) {
+                pr_err("%s: unable to add irq domain\n", np->full_name);
+                ret = -ENOMEM;
+                goto err_unmap;
+        }
+
+        ret = irq_alloc_domain_generic_chips(domain, 32, (nrirqs > 32) ? 2 : 1,
+                                             np->name, handle_level_irq, clr, 0,
+                                             IRQ_GC_INIT_MASK_CACHE);
+        if (ret) {
+                pr_err("%s: unable to alloc irq domain gc\n", np->full_name);
+                goto err_unmap;
+        }
+
+        gc = irq_get_domain_generic_chip(domain, 0);
+        gc->private = domain;
+        gc->reg_base = iobase;
+
+        gc->chip_types[0].regs.mask = APB_INT_MASK_L;
+        gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit;
+        gc->chip_types[0].chip.irq_unmask = irq_gc_mask_clr_bit;
+
+        if (nrirqs > 32) {
+                gc->chip_types[1].regs.mask = APB_INT_MASK_H;
+                gc->chip_types[1].chip.irq_mask = irq_gc_mask_set_bit;
+                gc->chip_types[1].chip.irq_unmask = irq_gc_mask_clr_bit;
+        }
+
+        irq_set_handler_data(irq, gc);
+        irq_set_chained_handler(irq, dw_apb_ictl_handler);
+
+        return 0;
+
+err_unmap:
+        iounmap(iobase);
+err_release:
+        release_mem_region(r.start, resource_size(&r));
+        return ret;
+}
+IRQCHIP_DECLARE(dw_apb_ictl,
+                "snps,dw-apb-ictl", dw_apb_ictl_init);