Re: [PATCH v3 1/6] irqchip: add support for Marvell Orion SoCs

[Grant Likely]

On Thu,  6 Jun 2013 18:27:09 +0200, Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx> 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@xxxxxxxxx>

Looks reasonable to me.

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

> ---
> Cc: Grant Likely <grant.likely@xxxxxxxxxx>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Rob Landley <rob@xxxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: John Stultz <john.stultz@xxxxxxxxxx>
> Cc: Russell King <linux@xxxxxxxxxxxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Andrew Lunn <andrew@xxxxxxx>
> Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
> Cc: Gregory Clement <gregory.clement@xxxxxxxxxxxxxxxxxx>
> Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> Cc: linux-doc@xxxxxxxxxxxxxxx
> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
>  .../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@xxxxxxxxx>
> + *
> + * 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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