[PATCH v3 4/7] ARM: mediatek: Add sysirq interrupt polarity support

[Joe.C <yingjoe.chen@mediatek.com>]

From: "Joe.C" <yingjoe.chen@mediatek.com>

Mediatek SoCs have interrupt polarity in sysirq which allows
to swap the polarity for given interrupts. Add this support
using hierarchy irq domain.

Signed-off-by: Joe.C <yingjoe.chen@mediatek.com>
---
 arch/arm/mach-mediatek/Kconfig      |   1 +
 drivers/irqchip/Makefile            |   1 +
 drivers/irqchip/irq-mt65xx-sysirq.c | 170 ++++++++++++++++++++++++++++++++++++
 3 files changed, 172 insertions(+)
 create mode 100644 drivers/irqchip/irq-mt65xx-sysirq.c

diff --git a/arch/arm/mach-mediatek/Kconfig b/arch/arm/mach-mediatek/Kconfig
index 2c043a2..7093859 100644
--- a/arch/arm/mach-mediatek/Kconfig
+++ b/arch/arm/mach-mediatek/Kconfig
@@ -2,5 +2,6 @@ config ARCH_MEDIATEK
 	bool "Mediatek MT6589 SoC" if ARCH_MULTI_V7
 	select ARM_GIC
 	select MTK_TIMER
+	select IRQ_DOMAIN_HIERARCHY
 	help
 	  Support for Mediatek Cortex-A7 Quad-Core-SoC MT6589.
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 73052ba..809c9d5 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -34,3 +34,4 @@ obj-$(CONFIG_XTENSA)			+= irq-xtensa-pic.o
 obj-$(CONFIG_XTENSA_MX)			+= irq-xtensa-mx.o
 obj-$(CONFIG_IRQ_CROSSBAR)		+= irq-crossbar.o
 obj-$(CONFIG_BRCMSTB_L2_IRQ)		+= irq-brcmstb-l2.o
+obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mt65xx-sysirq.o
diff --git a/drivers/irqchip/irq-mt65xx-sysirq.c b/drivers/irqchip/irq-mt65xx-sysirq.c
new file mode 100644
index 0000000..9e0eee5
--- /dev/null
+++ b/drivers/irqchip/irq-mt65xx-sysirq.c
@@ -0,0 +1,170 @@
+/*
+ * Copyright (c) 2014 MediaTek Inc.
+ * Author: Joe.C <yingjoe.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include "irqchip.h"
+
+#define MT6577_SYS_INTPOL_NUM	(224)
+
+struct mt_sysirq_chip_data {
+	spinlock_t lock;
+	void __iomem *intpol_base;
+};
+
+
+static int mt_sysirq_set_type(struct irq_data *data, unsigned int type)
+{
+	irq_hw_number_t hwirq = data->hwirq;
+	struct mt_sysirq_chip_data *chip_data = data->chip_data;
+	u32 offset, reg_index, value;
+	unsigned long flags;
+	int ret;
+
+	offset = hwirq & 0x1f;
+	reg_index = hwirq >> 5;
+
+	spin_lock_irqsave(&chip_data->lock, flags);
+	value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
+	if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
+		if (type == IRQ_TYPE_LEVEL_LOW)
+			type = IRQ_TYPE_LEVEL_HIGH;
+		else
+			type = IRQ_TYPE_EDGE_RISING;
+		value |= (1 << offset);
+	} else
+		value &= ~(1 << offset);
+	writel(value, chip_data->intpol_base + reg_index * 4);
+
+	data = data->parent_data;
+	ret = data->chip->irq_set_type(data, type);
+	spin_unlock_irqrestore(&chip_data->lock, flags);
+	return ret;
+}
+
+static struct irq_chip mt_sysirq_chip = {
+	.name			= "MT_SYSIRQ",
+	.irq_mask		= irq_chip_mask_parent,
+	.irq_unmask		= irq_chip_unmask_parent,
+	.irq_eoi		= irq_chip_eoi_parent,
+	.irq_set_type		= mt_sysirq_set_type,
+	.irq_retrigger		= irq_chip_retrigger_hierarchy,
+	.irq_set_affinity	= irq_chip_set_affinity_parent,
+};
+
+static int mt_sysirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				unsigned int nr_irqs, void *arg)
+{
+	int i, ret;
+	irq_hw_number_t hwirq;
+	struct of_phandle_args *irq_data = arg;
+	unsigned int type;
+
+	if (irq_data->args_count != 3)
+		return -EINVAL;
+
+	hwirq = irq_data->args[1];
+	if (irq_find_mapping(domain, hwirq) > 0)
+		return -EEXIST;
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+					&mt_sysirq_chip, domain->host_data);
+
+	ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
+	if (ret < 0)
+		return ret;
+
+	type = irq_data->args[2] & IRQ_TYPE_SENSE_MASK;
+
+	/* Set type if specified and different than the current one */
+	if (type != IRQ_TYPE_NONE &&
+	    type != irq_get_trigger_type(virq))
+		irq_set_irq_type(virq, type);
+
+	return 0;
+}
+
+static void mt_sysirq_domain_free(struct irq_domain *domain, unsigned int virq,
+				unsigned int nr_irqs)
+{
+	int i;
+
+	for (i = 0; i < nr_irqs; i++) {
+		irq_set_handler(virq + i, NULL);
+		irq_domain_set_hwirq_and_chip(domain, virq + i, 0, NULL, NULL);
+	}
+	irq_domain_free_irqs_parent(domain, virq, nr_irqs);
+}
+
+static struct irq_domain_ops sysirq_domain_ops = {
+	.alloc = mt_sysirq_domain_alloc,
+	.free = mt_sysirq_domain_free,
+};
+
+static int __init mtk_sysirq_of_init(struct device_node *node,
+				   struct device_node *parent)
+{
+	struct device_node *parent_node;
+	struct irq_domain *domain, *domain_parent = NULL;
+	struct mt_sysirq_chip_data *chip_data;
+	int ret = 0;
+
+	parent_node = of_irq_find_parent(node);
+	if (parent_node) {
+		domain_parent = irq_find_host(parent_node);
+		of_node_put(parent_node);
+	}
+
+	if (!domain_parent) {
+		pr_err("mtk_sysirq: interrupt-parent not found\n");
+		return -EINVAL;
+	}
+
+	chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
+	if (!chip_data)
+		return -ENOMEM;
+
+	chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
+	if (!chip_data->intpol_base) {
+		pr_err("mtk_sysirq: unable to map sysirq register\n");
+		ret = -ENOMEM;
+		goto out_free;
+	}
+
+	domain = irq_domain_add_linear(node, MT6577_SYS_INTPOL_NUM,
+				&sysirq_domain_ops, chip_data);
+	if (!domain) {
+		ret = -ENOMEM;
+		goto out_unmap;
+	}
+	domain->parent = domain_parent;
+	spin_lock_init(&chip_data->lock);
+
+	return 0;
+
+out_unmap:
+	iounmap(chip_data->intpol_base);
+out_free:
+	kfree(chip_data);
+	return ret;
+}
+IRQCHIP_DECLARE(mtk_sysirq, "mediatek,mt6577-sysirq", mtk_sysirq_of_init);
-- 
1.8.1.1.dirty