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[PATCH v7 0/4] irqchip:support mbigen interrupt controller

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  [PATCH v7 0/4] irqchip:support mbigen interrupt controller MaJun <majun258@huawei.com> - 2015-10-21 08:10 +0200
    [PATCH v7 2/4] irqchip: add platform device driver for mbigen device MaJun <majun258@huawei.com> - 2015-10-21 08:20 +0200
    [PATCH v7 1/4] dt-binding:Documents of the mbigen bindings MaJun <majun258@huawei.com> - 2015-10-21 08:20 +0200
    [PATCH v7 3/4] irqchip:create irq domain for each mbigen device MaJun <majun258@huawei.com> - 2015-10-21 08:20 +0200

#1252488 — [PATCH v7 0/4] irqchip:support mbigen interrupt controller

From: Ma Jun <majun258@huawei.com>

This patch set adds the driver of mbigen and binding document for Hisilicon
Mbigen chips.

Compared with previous version, this version changed much.

Because during the time between V3 and V4 of my patch, there are two
related patches were committed by Mr.Marc Zyngier and Mr. Mark Rutland.

First, Mr. Marc Zyngier changed MSI frame and added supporting for
platform MSI.

https://lkml.org/lkml/2015/7/28/552

Second, Mr.Mark Rutland changed Generic PCI MSI + IOMMU topology bindings

https://lkml.org/lkml/2015/7/23/558 

After V5 patch posted, Mr.Marc Zyngier posted a new patch set
"Adding core support for wire-MSI bridges"

https://lkml.org/lkml/2015/10/15/545

So, mbigen v6 patch is based on this new patch even though this patch is
still under review.

Changes in v7:
--- Fixed the build test error when applied patch v6 3/4
Changes in v6:
--- Re-based mbigen driver on kernel 4.3.0-rc5 and Marc's new patch
--- Change the mbigen chip node definition(dts).
--- Change the interrupt cells definition(dts).
Changes in v5:
--- Split mbigen driver patch into 2 smaller patches.
--- Change mbigen chip and mbigen device initialzing sequence.
--- Initializing mbigen device instead of mbigen chip as interrupt controller
--- Remove mbigen node from driver to make this driver more easily read.
--- Change the mbigen chip node definition(dts).
--- Change the interrupt cells definition(dts).
Changes in v4:
--- Re-based mbigen driver on kernel 4.2.0-rc2 and Marc's patch
--- Changed the binding document based on Mark's patch.

Ma Jun (4):
  dt-binding:Documents of the mbigen bindings
  irqchip: add platform device driver for mbigen device
  irqchip:create irq domain for each mbigen device
  irqchip:implement the mbigen irq chip operation functions

 Documentation/devicetree/bindings/arm/mbigen.txt |   63 ++++
 drivers/irqchip/Kconfig                          |    8 +
 drivers/irqchip/Makefile                         |    1 +
 drivers/irqchip/irq-mbigen.c                     |  335 ++++++++++++++++++++++
 4 files changed, 407 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/mbigen.txt
 create mode 100644 drivers/irqchip/irq-mbigen.c


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#1252489 — [PATCH v7 2/4] irqchip: add platform device driver for mbigen device

From: Ma Jun <majun258@huawei.com>

Mbigen means Message Based Interrupt Generator(MBIGEN).

Its a kind of interrupt controller that collects
the interrupts from external devices and generate msi interrupt.
Mbigen is applied to reduce the number of wire connected interrupts.

As the peripherals increasing, the interrupts lines needed is
increasing much, especially on the Arm64 server SOC.

Therefore, the interrupt pin in GIC is not enough to cover so
many peripherals.

Mbigen is designed to fix this problem.

Mbigen chip locates in ITS or outside of ITS.

Mbigen chip hardware structure shows as below:

		mbigen chip
|---------------------|-------------------|
mgn_node0	  mgn_node1		mgn_node2
 |		 |-------|		|-------|------|
dev1		dev1    dev2		dev1   dev3   dev4

Each mbigen chip contains several mbigen nodes.

External devices can connect to mbigen node through wire connecting way.

Because a mbigen node only can support 128 interrupt maximum, depends
on the interrupt lines number of devices, a device can connects to one
more mbigen nodes.

Also, several different devices can connect to a same mbigen node.

When devices triggered interrupt,mbigen chip detects and collects
the interrupts and generates the MBI interrupts by writing the ITS
Translator register.

To simplify mbigen driver,I used a new conception--mbigen device.
Each mbigen device is initialized as a platform device.

Mbigen device presents the parts(register, pin definition etc.) in
mbigen chip corresponding to a peripheral device.

So from software view, the structure likes below

	            mbigen chip
     |---------------------|-----------------|
mbigen device1       mbigen device2  mbigen device3
      |                   |                |
     dev1                dev2             dev3

Signed-off-by: Ma Jun <majun258@huawei.com>
---
 drivers/irqchip/Kconfig      |    8 ++++
 drivers/irqchip/Makefile     |    1 +
 drivers/irqchip/irq-mbigen.c |   83 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+), 0 deletions(-)
 create mode 100644 drivers/irqchip/irq-mbigen.c

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 4d7294e..b205e15 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -27,6 +27,14 @@ config ARM_GIC_V3_ITS
 	bool
 	select PCI_MSI_IRQ_DOMAIN
 
+config HISILICON_IRQ_MBIGEN
+	bool "Support mbigen interrupt controller"
+	default n
+	depends on ARM_GIC_V3 && ARM_GIC_V3_ITS && GENERIC_MSI_IRQ_DOMAIN
+	help
+	 Enable the mbigen interrupt controller used on
+	 Hisilicon platform.
+
 config ARM_NVIC
 	bool
 	select IRQ_DOMAIN
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 177f78f..cd76b11 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_ARM_GIC)			+= irq-gic.o irq-gic-common.o
 obj-$(CONFIG_ARM_GIC_V2M)		+= irq-gic-v2m.o
 obj-$(CONFIG_ARM_GIC_V3)		+= irq-gic-v3.o irq-gic-common.o
 obj-$(CONFIG_ARM_GIC_V3_ITS)		+= irq-gic-v3-its.o irq-gic-v3-its-pci-msi.o irq-gic-v3-its-platform-msi.o
+obj-$(CONFIG_HISILICON_IRQ_MBIGEN)	+= irq-mbigen.o
 obj-$(CONFIG_ARM_NVIC)			+= irq-nvic.o
 obj-$(CONFIG_ARM_VIC)			+= irq-vic.o
 obj-$(CONFIG_ATMEL_AIC_IRQ)		+= irq-atmel-aic-common.o irq-atmel-aic.o
diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
new file mode 100644
index 0000000..f18132f
--- /dev/null
+++ b/drivers/irqchip/irq-mbigen.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2015 Hisilicon Limited, All Rights Reserved.
+ * Author: Jun Ma <majun258@huawei.com>
+ * Author: Yun Wu <wuyun.wu@huawei.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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/**
+ * struct mbigen_device - holds the information of mbigen device.
+ *
+ * @pdev:		pointer to the platform device structure of mbigen chip.
+ * @base:		mapped address of this mbigen chip.
+ */
+struct mbigen_device {
+	struct platform_device	*pdev;
+	void __iomem		*base;
+};
+
+static int mbigen_device_probe(struct platform_device *pdev)
+{
+	struct mbigen_device *mgn_chip;
+
+	mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
+	if (!mgn_chip)
+		return -ENOMEM;
+
+	mgn_chip->pdev = pdev;
+	mgn_chip->base = of_iomap(pdev->dev.of_node, 0);
+
+	platform_set_drvdata(pdev, mgn_chip);
+
+	return 0;
+}
+
+static int mbigen_device_remove(struct platform_device *pdev)
+{
+	struct mbigen_device *mgn_chip = platform_get_drvdata(pdev);
+
+	iounmap(mgn_chip->base);
+
+	return 0;
+}
+
+static const struct of_device_id mbigen_of_match[] = {
+	{ .compatible = "hisilicon,mbigen-v2" },
+	{ /* END */ }
+};
+MODULE_DEVICE_TABLE(of, mbigen_of_match);
+
+static struct platform_driver mbigen_platform_driver = {
+	.driver = {
+		.name		= "Hisilicon MBIGEN-V2",
+		.owner		= THIS_MODULE,
+		.of_match_table	= mbigen_of_match,
+	},
+	.probe			= mbigen_device_probe,
+	.remove			= mbigen_device_remove,
+};
+
+module_platform_driver(mbigen_platform_driver);
+
+MODULE_AUTHOR("Jun Ma <majun258@huawei.com>");
+MODULE_AUTHOR("Yun Wu <wuyun.wu@huawei.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Hisilicon MBI Generator driver");
-- 
1.7.1


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#1252490 — [PATCH v7 1/4] dt-binding:Documents of the mbigen bindings

From: Ma Jun <majun258@huawei.com>

Add the mbigen msi interrupt controller bindings document.

This patch based on Mark Rutland's patch
https://lkml.org/lkml/2015/7/23/558

Signed-off-by: Ma Jun <majun258@huawei.com>
---
 Documentation/devicetree/bindings/arm/mbigen.txt |   63 ++++++++++++++++++++++
 1 files changed, 63 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/arm/mbigen.txt

diff --git a/Documentation/devicetree/bindings/arm/mbigen.txt b/Documentation/devicetree/bindings/arm/mbigen.txt
new file mode 100644
index 0000000..eb9a7fd
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/mbigen.txt
@@ -0,0 +1,63 @@
+Hisilicon mbigen device tree bindings.
+=======================================
+
+Mbigen means: message based interrupt generator.
+
+MBI is kind of msi interrupt only used on Non-PCI devices.
+
+To reduce the wired interrupt number connected to GIC,
+Hisilicon designed mbigen to collect and generate interrupt.
+
+
+Non-pci devices can connect to mbigen and generate the
+interrupt by writing ITS register.
+
+The mbigen chip and devices connect to mbigen have the following properties:
+
+Mbigen main node required properties:
+-------------------------------------------
+- compatible: Should be "hisilicon,mbigen-v2"
+- reg: Specifies the base physical address and size of the Mbigen
+  registers.
+- interrupt controller: Identifies the node as an interrupt controller
+- msi-parent: This property has two cells.
+	The 1st cell specifies the ITS this device connected.
+	The 2nd cell specifies the device id.
+- nr-msis:Specifies the total number of interrupt this device has.
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The value is 2 now.
+
+  The 1st cell is global hardware pin number of the interrupt.
+		This value depends on the Soc design.
+  The 2nd cell is the interrupt trigger type.
+
+Examples:
+
+ 	mbigen_device_gmac:intc {
+			compatible = "hisilicon,mbigen-v2";
+			reg = <0x0 0xc0080000 0x0 0x10000>;
+			interrupt-controller;
+			msi-parent = <&its_dsa 0x40b1c>;
+			num-msis = <9>;
+			#interrupt-cells = <2>;
+ 	};
+
+Devices connect to mbigen required properties:
+----------------------------------------------------
+-interrupt-parent: Specifies the mbigen device node which device connected.
+-interrupts:specifies the interrupt source.
+  The 1st cell is global hardware pin number of the interrupt.
+		This value depends on the Soc design.
+  The 2nd cell is the interrupt trigger type
+
+Examples:
+	gmac0: ethernet@c2080000 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		reg = <0 0xc2080000 0 0x20000>,
+		      <0 0xc0000000 0 0x1000>;
+		interrupt-parent  = <&mbigen_device_gmac>;
+		interrupts =	<656 1>,
+				<657 1>;
+	};
+
-- 
1.7.1


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#1252493 — [PATCH v7 3/4] irqchip:create irq domain for each mbigen device

From: Ma Jun <majun258@huawei.com>

For peripheral devices which connect to mbigen,mbigen is a interrupt
controller. So, we create irq domain for each mbigen device and add
mbigen irq domain into irq hierarchy structure.

Signed-off-by: Ma Jun <majun258@huawei.com>
---
 drivers/irqchip/irq-mbigen.c |  160 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 160 insertions(+), 0 deletions(-)

diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index f18132f..a0bbc2d 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -16,27 +16,172 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <linux/interrupt.h>
+#include <linux/irqchip.h>
 #include <linux/module.h>
+#include <linux/msi.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
+/* Interrupt numbers per mbigen node supported */
+#define IRQS_PER_MBIGEN_NODE		128
+
+/* 16 irqs (Pin0-pin15) are reserved for each mbigen chip */
+#define RESERVED_IRQ_PER_MBIGEN_CHIP	16
+
+/**
+ * In mbigen vector register
+ * bit[21:12]:	event id value
+ * bit[11:0]:	device id
+ */
+#define IRQ_EVENT_ID_SHIFT		12
+#define IRQ_EVENT_ID_MASK		0x3ff
+
+/* register range of each mbigen node */
+#define MBIGEN_NODE_OFFSET		0x1000
+
+/* offset of vector register in mbigen node */
+#define REG_MBIGEN_VEC_OFFSET		0x200
+
 /**
  * struct mbigen_device - holds the information of mbigen device.
  *
  * @pdev:		pointer to the platform device structure of mbigen chip.
  * @base:		mapped address of this mbigen chip.
+ * @domain:		pointer to the irq domain
  */
 struct mbigen_device {
 	struct platform_device	*pdev;
 	void __iomem		*base;
+	struct irq_domain	*domain;
+};
+
+/**
+ * struct mbigen_irq_data - private data of each irq
+ *
+ * @base:		mapped address of mbigen chip
+ * @reg_vec:		addr offset of interrupt vector register.
+ */
+struct mbigen_irq_data {
+	void __iomem		*base;
+	unsigned int		reg_vec;
+};
+
+static inline int get_mbigen_vec_reg(u32 nid, u32 offset)
+{
+	return (offset * 4) + nid * MBIGEN_NODE_OFFSET
+			+ REG_MBIGEN_VEC_OFFSET;
+}
+
+
+static struct irq_chip mbigen_irq_chip = {
+	.name =			"mbigen-v2",
+};
+
+static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg)
+{
+	struct mbigen_irq_data *mgn_irq_data = irq_get_chip_data(desc->irq);
+	u32 val;
+
+	val = readl_relaxed(mgn_irq_data->reg_vec + mgn_irq_data->base);
+
+	val &= ~(IRQ_EVENT_ID_MASK << IRQ_EVENT_ID_SHIFT);
+	val |= (msg->data << IRQ_EVENT_ID_SHIFT);
+
+	writel_relaxed(val, mgn_irq_data->reg_vec + mgn_irq_data->base);
+}
+
+static struct mbigen_irq_data *set_mbigen_irq_data(int hwirq)
+{
+	struct mbigen_irq_data *datap;
+	unsigned int nid, pin_offset;
+
+	datap = kzalloc(sizeof(*datap), GFP_KERNEL);
+	if (!datap)
+		return NULL;
+
+	/* get the mbigen node number */
+	nid = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP) / IRQS_PER_MBIGEN_NODE + 1;
+
+	pin_offset = (hwirq - RESERVED_IRQ_PER_MBIGEN_CHIP)
+					% IRQS_PER_MBIGEN_NODE;
+
+	datap->reg_vec = get_mbigen_vec_reg(nid, pin_offset);
+
+	return datap;
+}
+
+static int mbigen_domain_translate(struct irq_domain *d,
+				    struct irq_fwspec *fwspec,
+				    unsigned long *hwirq,
+				    unsigned int *type)
+{
+	if (is_of_node(fwspec->fwnode)) {
+		if (fwspec->param_count != 2)
+			return -EINVAL;
+
+		*hwirq = fwspec->param[0];
+		*type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
+
+		return 0;
+	}
+	return -EINVAL;
+}
+
+static int mbigen_irq_domain_alloc(struct irq_domain *domain,
+					unsigned int virq,
+					unsigned int nr_irqs,
+					void *args)
+{
+	struct irq_fwspec *fwspec = args;
+	irq_hw_number_t hwirq = fwspec->param[0];
+	struct mbigen_device *mgn_chip;
+	struct mbigen_irq_data *mgn_irq_data;
+	int i, err;
+
+	err = platform_msi_domain_alloc(domain, virq, nr_irqs);
+	if (err)
+		return err;
+
+	/* set related information of this irq */
+	mgn_irq_data = set_mbigen_irq_data(hwirq);
+	if (!mgn_irq_data)
+		return err;
+
+	mgn_chip = platform_msi_get_host_data(domain);
+	mgn_irq_data->base = mgn_chip->base;
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+				      &mbigen_irq_chip, mgn_irq_data);
+
+	return 0;
+}
+
+static void mbigen_domain_free(struct irq_domain *domain, unsigned int virq,
+			       unsigned int nr_irqs)
+{
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct mbigen_irq_data *mgn_irq_data = irq_data_get_irq_chip_data(d);
+
+	kfree(mgn_irq_data);
+	irq_domain_free_irqs_common(domain, virq, nr_irqs);
+}
+
+static struct irq_domain_ops mbigen_domain_ops = {
+	.translate	= mbigen_domain_translate,
+	.alloc		= mbigen_irq_domain_alloc,
+	.free		= mbigen_domain_free,
 };
 
 static int mbigen_device_probe(struct platform_device *pdev)
 {
 	struct mbigen_device *mgn_chip;
+	struct irq_domain *domain;
+	u32 num_msis;
 
 	mgn_chip = devm_kzalloc(&pdev->dev, sizeof(*mgn_chip), GFP_KERNEL);
 	if (!mgn_chip)
@@ -45,6 +190,20 @@ static int mbigen_device_probe(struct platform_device *pdev)
 	mgn_chip->pdev = pdev;
 	mgn_chip->base = of_iomap(pdev->dev.of_node, 0);
 
+	/* If there is no "num-msi" property, assume 64... */
+	if (of_property_read_u32(pdev->dev.of_node, "num-msis", &num_msis) < 0)
+		num_msis = 64;
+
+	domain = platform_msi_create_device_domain(&pdev->dev, num_msis,
+							mbigen_write_msg,
+							&mbigen_domain_ops,
+							mgn_chip);
+
+	if (!domain)
+		return -ENOMEM;
+
+	mgn_chip->domain = domain;
+
 	platform_set_drvdata(pdev, mgn_chip);
 
 	return 0;
@@ -54,6 +213,7 @@ static int mbigen_device_remove(struct platform_device *pdev)
 {
 	struct mbigen_device *mgn_chip = platform_get_drvdata(pdev);
 
+	irq_domain_remove(mgn_chip->domain);
 	iounmap(mgn_chip->base);
 
 	return 0;
-- 
1.7.1


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