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Commit a109893b authored by Thomas Petazzoni's avatar Thomas Petazzoni Committed by Jason Cooper
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irqchip/mvebu-pic: New driver for Marvell Armada 7K/8K PIC 



The Marvell Armada 7K/8K integrates a secondary interrupt controller
very originally named "PIC". It is connected to the main GIC via a
PPI. Amongst other things, this PIC is used for the ARM PMU.

This commit adds a simple irqchip driver for this interrupt
controller. Since this interrupt controller is not needed early at boot
time, we make the driver a proper platform driver rather than use the
IRQCHIP_DECLARE() mechanism.

Signed-off-by: default avatarYehuda Yitschak <yehuday@marvell.com>
Signed-off-by: default avatarThomas Petazzoni <thomas.petazzoni@free-electrons.com>
Link: https://lkml.kernel.org/r/1470408921-447-3-git-send-email-thomas.petazzoni@free-electrons.com


Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 33a6c324

drivers/irqchip/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -251,6 +251,9 @@ config IRQ_MXS 
config MVEBU_ODMI

	bool



config MVEBU_PIC

	bool



config LS_SCFG_MSI

	def_bool y if SOC_LS1021A || ARCH_LAYERSCAPE

	depends on PCI && PCI_MSI

drivers/irqchip/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ obj-$(CONFIG_INGENIC_IRQ) += irq-ingenic.o 
obj-$(CONFIG_IMX_GPCV2)			+= irq-imx-gpcv2.o

obj-$(CONFIG_PIC32_EVIC)		+= irq-pic32-evic.o

obj-$(CONFIG_MVEBU_ODMI)		+= irq-mvebu-odmi.o

obj-$(CONFIG_MVEBU_PIC)			+= irq-mvebu-pic.o

obj-$(CONFIG_LS_SCFG_MSI)		+= irq-ls-scfg-msi.o

obj-$(CONFIG_EZNPS_GIC)			+= irq-eznps.o

obj-$(CONFIG_ARCH_ASPEED)		+= irq-aspeed-vic.o

drivers/irqchip/irq-mvebu-pic.c

0 → 100644
+197 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016 Marvell

 *

 * Yehuda Yitschak <yehuday@marvell.com>

 * Thomas Petazzoni <thomas.petazzoni@free-electrons.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/interrupt.h>

#include <linux/io.h>

#include <linux/irq.h>

#include <linux/irqchip.h>

#include <linux/irqchip/chained_irq.h>

#include <linux/irqdomain.h>

#include <linux/module.h>

#include <linux/of_irq.h>

#include <linux/platform_device.h>



#define PIC_CAUSE	       0x0

#define PIC_MASK	       0x4



#define PIC_MAX_IRQS		32

#define PIC_MAX_IRQ_MASK	((1UL << PIC_MAX_IRQS) - 1)



struct mvebu_pic {

	void __iomem *base;

	u32 parent_irq;

	struct irq_domain *domain;

	struct irq_chip irq_chip;

};



static void mvebu_pic_reset(struct mvebu_pic *pic)

{

	/* ACK and mask all interrupts */

	writel(0, pic->base + PIC_MASK);

	writel(PIC_MAX_IRQ_MASK, pic->base + PIC_CAUSE);

}



static void mvebu_pic_eoi_irq(struct irq_data *d)

{

	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);



	writel(1 << d->hwirq, pic->base + PIC_CAUSE);

}



static void mvebu_pic_mask_irq(struct irq_data *d)

{

	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);

	u32 reg;



	reg =  readl(pic->base + PIC_MASK);

	reg |= (1 << d->hwirq);

	writel(reg, pic->base + PIC_MASK);

}



static void mvebu_pic_unmask_irq(struct irq_data *d)

{

	struct mvebu_pic *pic = irq_data_get_irq_chip_data(d);

	u32 reg;



	reg = readl(pic->base + PIC_MASK);

	reg &= ~(1 << d->hwirq);

	writel(reg, pic->base + PIC_MASK);

}



static int mvebu_pic_irq_map(struct irq_domain *domain, unsigned int virq,

			     irq_hw_number_t hwirq)

{

	struct mvebu_pic *pic = domain->host_data;



	irq_set_percpu_devid(virq);

	irq_set_chip_data(virq, pic);

	irq_set_chip_and_handler(virq, &pic->irq_chip,

				 handle_percpu_devid_irq);

	irq_set_status_flags(virq, IRQ_LEVEL);

	irq_set_probe(virq);



	return 0;

}



static const struct irq_domain_ops mvebu_pic_domain_ops = {

	.map = mvebu_pic_irq_map,

	.xlate = irq_domain_xlate_onecell,

};



static void mvebu_pic_handle_cascade_irq(struct irq_desc *desc)

{

	struct mvebu_pic *pic = irq_desc_get_handler_data(desc);

	struct irq_chip *chip = irq_desc_get_chip(desc);

	unsigned long irqmap, irqn;

	unsigned int cascade_irq;



	irqmap = readl_relaxed(pic->base + PIC_CAUSE);

	chained_irq_enter(chip, desc);



	for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) {

		cascade_irq = irq_find_mapping(pic->domain, irqn);

		generic_handle_irq(cascade_irq);

	}



	chained_irq_exit(chip, desc);

}



static void mvebu_pic_enable_percpu_irq(void *data)

{

	struct mvebu_pic *pic = data;



	mvebu_pic_reset(pic);

	enable_percpu_irq(pic->parent_irq, IRQ_TYPE_NONE);

}



static void mvebu_pic_disable_percpu_irq(void *data)

{

	struct mvebu_pic *pic = data;



	disable_percpu_irq(pic->parent_irq);

}



static int mvebu_pic_probe(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node;

	struct mvebu_pic *pic;

	struct irq_chip *irq_chip;

	struct resource *res;



	pic = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pic), GFP_KERNEL);

	if (!pic)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	pic->base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(pic->base))

		return PTR_ERR(pic->base);



	irq_chip = &pic->irq_chip;

	irq_chip->name = dev_name(&pdev->dev);

	irq_chip->irq_mask = mvebu_pic_mask_irq;

	irq_chip->irq_unmask = mvebu_pic_unmask_irq;

	irq_chip->irq_eoi = mvebu_pic_eoi_irq;



	pic->parent_irq = irq_of_parse_and_map(node, 0);

	if (pic->parent_irq <= 0) {

		dev_err(&pdev->dev, "Failed to parse parent interrupt\n");

		return -EINVAL;

	}



	pic->domain = irq_domain_add_linear(node, PIC_MAX_IRQS,

					    &mvebu_pic_domain_ops, pic);

	if (!pic->domain) {

		dev_err(&pdev->dev, "Failed to allocate irq domain\n");

		return -ENOMEM;

	}



	irq_set_chained_handler(pic->parent_irq, mvebu_pic_handle_cascade_irq);

	irq_set_handler_data(pic->parent_irq, pic);



	on_each_cpu(mvebu_pic_enable_percpu_irq, pic, 1);



	platform_set_drvdata(pdev, pic);



	return 0;

}



static int mvebu_pic_remove(struct platform_device *pdev)

{

	struct mvebu_pic *pic = platform_get_drvdata(pdev);



	on_each_cpu(mvebu_pic_disable_percpu_irq, pic, 1);

	irq_domain_remove(pic->domain);



	return 0;

}



static const struct of_device_id mvebu_pic_of_match[] = {

	{ .compatible = "marvell,armada-8k-pic", },

	{},

};

MODULE_DEVICE_TABLE(of, mvebu_pic_of_match);



static struct platform_driver mvebu_pic_driver = {

	.probe  = mvebu_pic_probe,

	.remove = mvebu_pic_remove,

	.driver = {

		.name = "mvebu-pic",

		.of_match_table = mvebu_pic_of_match,

	},

};

module_platform_driver(mvebu_pic_driver);



MODULE_AUTHOR("Yehuda Yitschak <yehuday@marvell.com>");

MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");

MODULE_LICENSE("GPL v2");

MODULE_ALIAS("platform:mvebu_pic");