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SubjectRe: [PATCH v3 1/6] irqchip: add support for Marvell Orion SoCs
Date
On Thu,  6 Jun 2013 18:27:09 +0200, Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> wrote:
> 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>

Looks reasonable to me.

Acked-by: Grant Likely <grant.likely@secretlab.ca>

> ---
> Cc: Grant Likely <grant.likely@linaro.org>
> Cc: Rob Herring <rob.herring@calxeda.com>
> Cc: Rob Landley <rob@landley.net>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> 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-doc@vger.kernel.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> ---
> .../interrupt-controller/marvell,orion-intc.txt | 48 +++++
> drivers/irqchip/Kconfig | 5 +
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-orion.c | 193 ++++++++++++++++++++
> 4 files changed, 247 insertions(+), 0 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/interrupt-controller/marvell,orion-intc.txt
> create mode 100644 drivers/irqchip/irq-orion.c
>
> 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 0000000..2c11ac7
> --- /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 4a33351..68c3107 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 cda4cb5..55df3bd 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 0000000..693ea20
> --- /dev/null
> +++ b/drivers/irqchip/irq-orion.c
> @@ -0,0 +1,193 @@
> +/*
> + * 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;
> + struct resource r;
> + int n, ret, base, num_chips = 0;
> +
> + /* 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;
> + }
> +
> + 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);
> --
> 1.7.2.5
>

--
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.


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