irqchip: Add support for Marvell Orion SoCs

This patch adds an irqchip driver for the main interrupt controller found
on Marvell Orion SoCs (Kirkwood, Dove, Orion5x, Discovery Innovation).
Corresponding device tree documentation is also added.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Acked-by: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1370536034-23956-2-git-send-email-sebastian.hesselbarth@gmail.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

4 files changed, 246 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/interrupt-controller/marvell,orion-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/marvell,orion-intc.txt
new file mode 100644
index 000000000000..2c11ac76fac9
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/marvell,orion-intc.txt
@@ -0,0 +1,48 @@
+Marvell Orion SoC interrupt controllers
+
+* Main interrupt controller
+
+Required properties:
+- compatible: shall be "marvell,orion-intc"
+- reg: base address(es) of interrupt registers starting with CAUSE register
+- interrupt-controller: identifies the node as an interrupt controller
+- #interrupt-cells: number of cells to encode an interrupt source, shall be 1
+
+The interrupt sources map to the corresponding bits in the interrupt
+registers, i.e.
+- 0 maps to bit 0 of first base address,
+- 1 maps to bit 1 of first base address,
+- 32 maps to bit 0 of second base address, and so on.
+
+Example:
+        intc: interrupt-controller {
+                compatible = "marvell,orion-intc";
+                interrupt-controller;
+                #interrupt-cells = <1>;
+                 /* Dove has 64 first level interrupts */
+                reg = <0x20200 0x10>, <0x20210 0x10>;
+        };
+
+* Bridge interrupt controller
+
+Required properties:
+- compatible: shall be "marvell,orion-bridge-intc"
+- reg: base address of bridge interrupt registers starting with CAUSE register
+- interrupts: bridge interrupt of the main interrupt controller
+- interrupt-controller: identifies the node as an interrupt controller
+- #interrupt-cells: number of cells to encode an interrupt source, shall be 1
+
+Optional properties:
+- marvell,#interrupts: number of interrupts provided by bridge interrupt
+      controller, defaults to 32 if not set
+
+Example:
+        bridge_intc: interrupt-controller {
+                compatible = "marvell,orion-bridge-intc";
+                interrupt-controller;
+                #interrupt-cells = <1>;
+                reg = <0x20110 0x8>;
+                interrupts = <0>;
+                /* Dove bridge provides 5 interrupts */
+                marvell,#interrupts = <5>;
+        };
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 4a33351c25dc..68c31071968d 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -25,6 +25,11 @@ config ARM_VIC_NR
           The maximum number of VICs available in the system, for
           power management.
 
+config ORION_IRQCHIP
+        bool
+        select IRQ_DOMAIN
+        select MULTI_IRQ_HANDLER
+
 config RENESAS_INTC_IRQPIN
         bool
         select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index cda4cb5f7327..55df3bdf804d 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_ARCH_MXS)			+= irq-mxs.o
 obj-$(CONFIG_ARCH_S3C24XX)              += irq-s3c24xx.o
 obj-$(CONFIG_METAG)                     += irq-metag-ext.o
 obj-$(CONFIG_METAG_PERFCOUNTER_IRQS)    += irq-metag.o
+obj-$(CONFIG_ORION_IRQCHIP)             += irq-orion.o
 obj-$(CONFIG_ARCH_SUNXI)                += irq-sun4i.o
 obj-$(CONFIG_ARCH_SPEAR3XX)             += spear-shirq.o
 obj-$(CONFIG_ARM_GIC)                   += irq-gic.o
diff --git a/drivers/irqchip/irq-orion.c b/drivers/irqchip/irq-orion.c
new file mode 100644
index 000000000000..e51d40031884
--- /dev/null
+++ b/drivers/irqchip/irq-orion.c
@@ -0,0 +1,192 @@
+/*
+ * Marvell Orion SoCs IRQ chip driver.
+ *
+ * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
+ *
+ * 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/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <asm/exception.h>
+#include <asm/mach/irq.h>
+
+#include "irqchip.h"
+
+/*
+ * Orion SoC main interrupt controller
+ */
+#define ORION_IRQS_PER_CHIP             32
+
+#define ORION_IRQ_CAUSE                 0x00
+#define ORION_IRQ_MASK                  0x04
+#define ORION_IRQ_FIQ_MASK              0x08
+#define ORION_IRQ_ENDP_MASK             0x0c
+
+static struct irq_domain *orion_irq_domain;
+
+static asmlinkage void
+__exception_irq_entry orion_handle_irq(struct pt_regs *regs)
+{
+        struct irq_domain_chip_generic *dgc = orion_irq_domain->gc;
+        int n, base = 0;
+
+        for (n = 0; n < dgc->num_chips; n++, base += ORION_IRQS_PER_CHIP) {
+                struct irq_chip_generic *gc =
+                        irq_get_domain_generic_chip(orion_irq_domain, base);
+                u32 stat = readl_relaxed(gc->reg_base + ORION_IRQ_CAUSE) &
+                        gc->mask_cache;
+                while (stat) {
+                        u32 hwirq = ffs(stat) - 1;
+                        u32 irq = irq_find_mapping(orion_irq_domain,
+                                                   gc->irq_base + hwirq);
+                        handle_IRQ(irq, regs);
+                        stat &= ~(1 << hwirq);
+                }
+        }
+}
+
+static int __init orion_irq_init(struct device_node *np,
+                                 struct device_node *parent)
+{
+        unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
+        int n, ret, base, num_chips = 0;
+        struct resource r;
+
+        /* count number of irq chips by valid reg addresses */
+        while (of_address_to_resource(np, num_chips, &r) == 0)
+                num_chips++;
+
+        orion_irq_domain = irq_domain_add_linear(np,
+                                num_chips * ORION_IRQS_PER_CHIP,
+                                &irq_generic_chip_ops, NULL);
+        if (!orion_irq_domain)
+                panic("%s: unable to add irq domain\n", np->name);
+
+        ret = irq_alloc_domain_generic_chips(orion_irq_domain,
+                                ORION_IRQS_PER_CHIP, 1, np->name,
+                                handle_level_irq, clr, 0,
+                                IRQ_GC_INIT_MASK_CACHE);
+        if (ret)
+                panic("%s: unable to alloc irq domain gc\n", np->name);
+
+        for (n = 0, base = 0; n < num_chips; n++, base += ORION_IRQS_PER_CHIP) {
+                struct irq_chip_generic *gc =
+                        irq_get_domain_generic_chip(orion_irq_domain, base);
+
+                of_address_to_resource(np, n, &r);
+
+                if (!request_mem_region(r.start, resource_size(&r), np->name))
+                        panic("%s: unable to request mem region %d",
+                              np->name, n);
+
+                gc->reg_base = ioremap(r.start, resource_size(&r));
+                if (!gc->reg_base)
+                        panic("%s: unable to map resource %d", np->name, n);
+
+                gc->chip_types[0].regs.mask = ORION_IRQ_MASK;
+                gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
+                gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
+
+                /* mask all interrupts */
+                writel(0, gc->reg_base + ORION_IRQ_MASK);
+        }
+
+        set_handle_irq(orion_handle_irq);
+        return 0;
+}
+IRQCHIP_DECLARE(orion_intc, "marvell,orion-intc", orion_irq_init);
+
+/*
+ * Orion SoC bridge interrupt controller
+ */
+#define ORION_BRIDGE_IRQ_CAUSE  0x00
+#define ORION_BRIDGE_IRQ_MASK   0x04
+
+static void orion_bridge_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+        struct irq_domain *d = irq_get_handler_data(irq);
+        struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, irq);
+        u32 stat = readl_relaxed(gc->reg_base + ORION_BRIDGE_IRQ_CAUSE) &
+                   gc->mask_cache;
+
+        while (stat) {
+                u32 hwirq = ffs(stat) - 1;
+
+                generic_handle_irq(irq_find_mapping(d, gc->irq_base + hwirq));
+                stat &= ~(1 << hwirq);
+        }
+}
+
+static int __init orion_bridge_irq_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;
+        int ret, irq, nrirqs = 32;
+
+        /* get optional number of interrupts provided */
+        of_property_read_u32(np, "marvell,#interrupts", &nrirqs);
+
+        domain = irq_domain_add_linear(np, nrirqs,
+                                       &irq_generic_chip_ops, NULL);
+        if (!domain) {
+                pr_err("%s: unable to add irq domain\n", np->name);
+                return -ENOMEM;
+        }
+
+        ret = irq_alloc_domain_generic_chips(domain, nrirqs, 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->name);
+                return ret;
+        }
+
+        ret = of_address_to_resource(np, 0, &r);
+        if (ret) {
+                pr_err("%s: unable to get resource\n", np->name);
+                return ret;
+        }
+
+        if (!request_mem_region(r.start, resource_size(&r), np->name)) {
+                pr_err("%s: unable to request mem region\n", np->name);
+                return -ENOMEM;
+        }
+
+        /* 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->name);
+                return -EINVAL;
+        }
+
+        gc = irq_get_domain_generic_chip(domain, 0);
+        gc->reg_base = ioremap(r.start, resource_size(&r));
+        if (!gc->reg_base) {
+                pr_err("%s: unable to map resource\n", np->name);
+                return -ENOMEM;
+        }
+
+        gc->chip_types[0].regs.ack = ORION_BRIDGE_IRQ_CAUSE;
+        gc->chip_types[0].regs.mask = ORION_BRIDGE_IRQ_MASK;
+        gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit;
+        gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
+        gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
+
+        /* mask all interrupts */
+        writel(0, gc->reg_base + ORION_BRIDGE_IRQ_MASK);
+
+        irq_set_handler_data(irq, domain);
+        irq_set_chained_handler(irq, orion_bridge_irq_handler);
+
+        return 0;
+}
+IRQCHIP_DECLARE(orion_bridge_intc,
+                "marvell,orion-bridge-intc", orion_bridge_irq_init);