[PATCH V7 5/9] mfd: Add driver for NVIDIA Tegra XUSB

[Andrew Bresticker]

Add an MFD driver for the XUSB host complex found on NVIDIA Tegra124
and later SoCs.

Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
Cc: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Lee Jones <lee.jones@xxxxxxxxxx>
---
New for v7.
---
 drivers/mfd/Kconfig      |   7 ++
 drivers/mfd/Makefile     |   1 +
 drivers/mfd/tegra-xusb.c | 167 +++++++++++++++++++++++++++++++++++++++++++++++
 include/soc/tegra/xusb.h |  19 ++++++
 4 files changed, 194 insertions(+)
 create mode 100644 drivers/mfd/tegra-xusb.c
 create mode 100644 include/soc/tegra/xusb.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index d5ad04d..61872b4 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1430,6 +1430,13 @@ config MFD_STW481X
 	  in various ST Microelectronics and ST-Ericsson embedded
 	  Nomadik series.
 
+config MFD_TEGRA_XUSB
+	tristate "NVIDIA Tegra XUSB"
+	depends on ARCH_TEGRA
+	select MFD_CORE
+	help
+	  Support for the XUSB complex found on NVIDIA Tegra124 and later SoCs.
+
 menu "Multimedia Capabilities Port drivers"
 	depends on ARCH_SA1100
 
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 0e5cfeb..7588caf 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -181,6 +181,7 @@ obj-$(CONFIG_MFD_HI6421_PMIC)	+= hi6421-pmic-core.o
 obj-$(CONFIG_MFD_DLN2)		+= dln2.o
 obj-$(CONFIG_MFD_RT5033)	+= rt5033.o
 obj-$(CONFIG_MFD_SKY81452)	+= sky81452.o
+obj-$(CONFIG_MFD_TEGRA_XUSB)	+= tegra-xusb.o
 
 intel-soc-pmic-objs		:= intel_soc_pmic_core.o intel_soc_pmic_crc.o
 obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
diff --git a/drivers/mfd/tegra-xusb.c b/drivers/mfd/tegra-xusb.c
new file mode 100644
index 0000000..d30d259
--- /dev/null
+++ b/drivers/mfd/tegra-xusb.c
@@ -0,0 +1,167 @@
+/*
+ * NVIDIA Tegra XUSB MFD driver
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+#include <soc/tegra/xusb.h>
+
+struct tegra_xusb_soc_data {
+	struct mfd_cell *devs;
+	unsigned int num_devs;
+};
+
+static struct resource tegra_xhci_resources[] = {
+	{
+		.name = "host",
+		.flags = IORESOURCE_IRQ,
+	},
+	{
+		.name = "xhci",
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.name = "ipfs",
+		.flags = IORESOURCE_MEM,
+	},
+};
+
+static struct resource tegra_xusb_mbox_resources[] = {
+	{
+		.name = "smi",
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
+static struct mfd_cell tegra124_xusb_devs[] = {
+	{
+		.name = "tegra-xhci",
+		.of_compatible = "nvidia,tegra124-xhci",
+	},
+	{
+		.name = "tegra-xusb-mbox",
+		.of_compatible = "nvidia,tegra124-xusb-mbox",
+	},
+};
+
+static const struct tegra_xusb_soc_data tegra124_xusb_data = {
+	.devs = tegra124_xusb_devs,
+	.num_devs = ARRAY_SIZE(tegra124_xusb_devs),
+};
+
+static const struct of_device_id tegra_xusb_of_match[] = {
+	{ .compatible = "nvidia,tegra124-xusb", .data = &tegra124_xusb_data },
+	{},
+};
+MODULE_DEVICE_TABLE(of, tegra_xusb_of_match);
+
+static struct regmap_config tegra_fpci_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+};
+
+static int tegra_xusb_probe(struct platform_device *pdev)
+{
+	const struct tegra_xusb_soc_data *soc;
+	const struct of_device_id *match;
+	struct tegra_xusb *xusb;
+	struct resource *res;
+	void __iomem *fpci_base;
+	int irq, ret;
+
+	xusb = devm_kzalloc(&pdev->dev, sizeof(*xusb), GFP_KERNEL);
+	if (!xusb)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, xusb);
+
+	match = of_match_node(tegra_xusb_of_match, pdev->dev.of_node);
+	soc = match->data;
+
+	irq = platform_get_irq_byname(pdev, "host");
+	if (irq < 0)
+		return irq;
+	tegra_xhci_resources[0].start = irq;
+	tegra_xhci_resources[0].end = irq;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "xhci");
+	if (!res)
+		return -ENODEV;
+	tegra_xhci_resources[1].start = res->start;
+	tegra_xhci_resources[1].end = res->end;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ipfs");
+	if (!res)
+		return -ENODEV;
+	tegra_xhci_resources[2].start = res->start;
+	tegra_xhci_resources[2].end = res->end;
+
+	soc->devs[0].resources = tegra_xhci_resources;
+	soc->devs[0].num_resources = ARRAY_SIZE(tegra_xhci_resources);
+
+	irq = platform_get_irq_byname(pdev, "smi");
+	if (irq < 0)
+		return irq;
+	tegra_xusb_mbox_resources[0].start = irq;
+	tegra_xusb_mbox_resources[0].end = irq;
+
+	soc->devs[1].resources = tegra_xusb_mbox_resources;
+	soc->devs[1].num_resources = ARRAY_SIZE(tegra_xusb_mbox_resources);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fpci");
+	fpci_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(fpci_base))
+		return PTR_ERR(fpci_base);
+
+	tegra_fpci_regmap_config.max_register = res->end - res->start - 3;
+	xusb->fpci_regs = devm_regmap_init_mmio(&pdev->dev, fpci_base,
+						&tegra_fpci_regmap_config);
+	if (IS_ERR(xusb->fpci_regs)) {
+		ret = PTR_ERR(xusb->fpci_regs);
+		dev_err(&pdev->dev, "Failed to init regmap: %d\n", ret);
+		return ret;
+	}
+
+	ret = mfd_add_devices(&pdev->dev, -1, soc->devs, soc->num_devs,
+			      NULL, 0, NULL);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to add MFD devices: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int tegra_xusb_remove(struct platform_device *pdev)
+{
+	mfd_remove_devices(&pdev->dev);
+
+	return 0;
+}
+
+static struct platform_driver tegra_xusb_driver = {
+	.probe = tegra_xusb_probe,
+	.remove = tegra_xusb_remove,
+	.driver = {
+		.name = "tegra-xusb",
+		.of_match_table = tegra_xusb_of_match,
+	},
+};
+module_platform_driver(tegra_xusb_driver);
+
+MODULE_DESCRIPTION("NVIDIA Tegra XUSB MFD");
+MODULE_AUTHOR("Andrew Bresticker <abrestic@xxxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/soc/tegra/xusb.h b/include/soc/tegra/xusb.h
new file mode 100644
index 0000000..9d28d90
--- /dev/null
+++ b/include/soc/tegra/xusb.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (C) 2014 NVIDIA Corporation
+ * Copyright (C) 2014 Google, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#ifndef __SOC_TEGRA_XUSB_H__
+#define __SOC_TEGRA_XUSB_H__
+
+struct regmap;
+
+struct tegra_xusb {
+	struct regmap *fpci_regs;
+};
+
+#endif /* __SOC_TEGRA_XUSB_H__ */
-- 
2.2.0.rc0.207.ga3a616c

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