[PATCH v3 06/16] irqchip: add sl28cpld interrupt controller support

[Michael Walle <michael@walle.cc>]

This patch adds support for the interrupt controller inside the sl28
CPLD management controller.

Signed-off-by: Michael Walle <michael@walle.cc>
---
 drivers/irqchip/Kconfig        |  3 ++
 drivers/irqchip/Makefile       |  1 +
 drivers/irqchip/irq-sl28cpld.c | 97 ++++++++++++++++++++++++++++++++++
 drivers/mfd/Kconfig            |  2 +
 4 files changed, 103 insertions(+)
 create mode 100644 drivers/irqchip/irq-sl28cpld.c

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index a85aada04a64..234db932e7cf 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -246,6 +246,9 @@ 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
+
 config ST_IRQCHIP
 	bool
 	select REGMAP
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 37bbe39bf909..e3c6b94f7b0a 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -107,3 +107,4 @@ obj-$(CONFIG_TI_SCI_INTR_IRQCHIP)	+= irq-ti-sci-intr.o
 obj-$(CONFIG_TI_SCI_INTA_IRQCHIP)	+= irq-ti-sci-inta.o
 obj-$(CONFIG_LOONGSON_LIOINTC)		+= irq-loongson-liointc.o
 obj-$(CONFIG_LOONGSON_HTPIC)		+= irq-loongson-htpic.o
+obj-$(CONFIG_SL28CPLD_INTC)		+= irq-sl28cpld.o
diff --git a/drivers/irqchip/irq-sl28cpld.c b/drivers/irqchip/irq-sl28cpld.c
new file mode 100644
index 000000000000..88de71d32b09
--- /dev/null
+++ b/drivers/irqchip/irq-sl28cpld.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * sl28cpld interrupt controller driver.
+ *
+ * Copyright 2019 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/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 sl28cpld_intc *irqchip;
+	struct resource *res;
+	unsigned int irq;
+	int ret;
+
+	if (!pdev->dev.parent)
+		return -ENODEV;
+
+	irqchip = devm_kzalloc(&pdev->dev, sizeof(*irqchip), GFP_KERNEL);
+	if (!irqchip)
+		return -ENOMEM;
+
+	irqchip->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+	if (!irqchip->regmap)
+		return -ENODEV;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (!res)
+		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 = res->start + INTC_IP;
+	irqchip->chip.mask_base = res->start + INTC_IE;
+	irqchip->chip.mask_invert = true,
+	irqchip->chip.ack_base = res->start + INTC_IP;
+
+	ret = devm_regmap_add_irq_chip(&pdev->dev, irqchip->regmap, irq,
+				       IRQF_SHARED | IRQF_ONESHOT, 0,
+				       &irqchip->chip, &irqchip->irq_data);
+	if (ret)
+		return ret;
+	dev_info(&pdev->dev, "registered IRQ %d\n", irq);
+
+	return 0;
+}
+
+static const struct platform_device_id sl28cpld_intc_id_table[] = {
+	{ "sl28cpld-intc" },
+	{}
+};
+MODULE_DEVICE_TABLE(platform, sl28cpld_intc_id_table);
+
+static struct platform_driver sl28cpld_intc_driver = {
+	.probe	= sl28cpld_intc_probe,
+	.id_table = sl28cpld_intc_id_table,
+	.driver = {
+		.name = KBUILD_MODNAME,
+	}
+};
+module_platform_driver(sl28cpld_intc_driver);
+
+MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index be0c8d93c526..9e848a455172 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -2065,6 +2065,8 @@ config MFD_SL28CPLD
 	depends on I2C=y
 	depends on OF
 	select REGMAP_I2C
+	select REGMAP_IRQ
+	select SL28CPLD_INTC
 	select MFD_CORE
 	help
 	  This option enables support for the board management controller
-- 
2.20.1