Commit 03ac990e authored by Michael Walle's avatar Michael Walle Committed by Lee Jones
Browse files

irqchip: Add sl28cpld interrupt controller support 



Add support for the interrupt controller inside the sl28 CPLD management
controller.

The interrupt controller can handle at most 8 interrupts and is really
simplistic and consists only of an interrupt mask and an interrupt
pending register.

Signed-off-by: default avatarMichael Walle <michael@walle.cc>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent a538ad22

drivers/irqchip/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -246,6 +246,14 @@ config RENESAS_RZA1_IRQC 
	  Enable support for the Renesas RZ/A1 Interrupt Controller, to use up

	  to 8 external interrupts with configurable sense select.



config SL28CPLD_INTC

	bool "Kontron sl28cpld IRQ controller"

	depends on MFD_SL28CPLD=y || COMPILE_TEST

	select REGMAP_IRQ

	help

	  Interrupt controller driver for the board management controller

	  found on the Kontron sl28 CPLD.



config ST_IRQCHIP

	bool

	select REGMAP

drivers/irqchip/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -111,3 +111,4 @@ obj-$(CONFIG_LOONGSON_HTPIC) += irq-loongson-htpic.o 
obj-$(CONFIG_LOONGSON_HTVEC)		+= irq-loongson-htvec.o

obj-$(CONFIG_LOONGSON_PCH_PIC)		+= irq-loongson-pch-pic.o

obj-$(CONFIG_LOONGSON_PCH_MSI)		+= irq-loongson-pch-msi.o

obj-$(CONFIG_SL28CPLD_INTC)		+= irq-sl28cpld.o

drivers/irqchip/irq-sl28cpld.c

0 → 100644
+96 −0
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// SPDX-License-Identifier: GPL-2.0-only

/*

 * sl28cpld interrupt controller driver

 *

 * Copyright 2020 Kontron Europe GmbH

 */



#include <linux/interrupt.h>

#include <linux/kernel.h>

#include <linux/mod_devicetable.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/property.h>

#include <linux/regmap.h>



#define INTC_IE 0x00

#define INTC_IP 0x01



static const struct regmap_irq sl28cpld_irqs[] = {

	REGMAP_IRQ_REG_LINE(0, 8),

	REGMAP_IRQ_REG_LINE(1, 8),

	REGMAP_IRQ_REG_LINE(2, 8),

	REGMAP_IRQ_REG_LINE(3, 8),

	REGMAP_IRQ_REG_LINE(4, 8),

	REGMAP_IRQ_REG_LINE(5, 8),

	REGMAP_IRQ_REG_LINE(6, 8),

	REGMAP_IRQ_REG_LINE(7, 8),

};



struct sl28cpld_intc {

	struct regmap *regmap;

	struct regmap_irq_chip chip;

	struct regmap_irq_chip_data *irq_data;

};



static int sl28cpld_intc_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	struct sl28cpld_intc *irqchip;

	int irq;

	u32 base;

	int ret;



	if (!dev->parent)

		return -ENODEV;



	irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);

	if (!irqchip)

		return -ENOMEM;



	irqchip->regmap = dev_get_regmap(dev->parent, NULL);

	if (!irqchip->regmap)

		return -ENODEV;



	irq = platform_get_irq(pdev, 0);

	if (irq < 0)

		return irq;



	ret = device_property_read_u32(&pdev->dev, "reg", &base);

	if (ret)

		return -EINVAL;



	irqchip->chip.name = "sl28cpld-intc";

	irqchip->chip.irqs = sl28cpld_irqs;

	irqchip->chip.num_irqs = ARRAY_SIZE(sl28cpld_irqs);

	irqchip->chip.num_regs = 1;

	irqchip->chip.status_base = base + INTC_IP;

	irqchip->chip.mask_base = base + INTC_IE;

	irqchip->chip.mask_invert = true,

	irqchip->chip.ack_base = base + INTC_IP;



	return devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),

					       irqchip->regmap, irq,

					       IRQF_SHARED | IRQF_ONESHOT, 0,

					       &irqchip->chip,

					       &irqchip->irq_data);

}



static const struct of_device_id sl28cpld_intc_of_match[] = {

	{ .compatible = "kontron,sl28cpld-intc" },

	{}

};

MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);



static struct platform_driver sl28cpld_intc_driver = {

	.probe = sl28cpld_intc_probe,

	.driver = {

		.name = "sl28cpld-intc",

		.of_match_table = sl28cpld_intc_of_match,

	}

};

module_platform_driver(sl28cpld_intc_driver);



MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");

MODULE_AUTHOR("Michael Walle <michael@walle.cc>");

MODULE_LICENSE("GPL");