drivers/usb/dwc3/dwc3-msm.c

/* Copyright (c) 2012, Code Aurora Forum. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/usb/msm_hsusb.h>
#include <linux/delay.h>
#include <linux/of.h>

#define DBM_MAX_EPS		4

struct dwc3_msm {
	struct platform_device *dwc3;
	struct device *dev;
	void __iomem *base;
	u32 resource_size;
	int dbm_num_eps;
};

static int __devinit dwc3_msm_probe(struct platform_device *pdev)
{
	struct device_node *node = pdev->dev.of_node;
	struct platform_device *dwc3;
	struct dwc3_msm *msm;
	struct resource *res;
	int ret = 0;

	msm = devm_kzalloc(&pdev->dev, sizeof(*msm), GFP_KERNEL);
	if (!msm) {
		dev_err(&pdev->dev, "not enough memory\n");
		return -ENOMEM;
	}

	platform_set_drvdata(pdev, msm);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "missing memory base resource\n");
		return -ENODEV;
	}

	msm->base = devm_ioremap_nocache(&pdev->dev, res->start,
		resource_size(res));
	if (!msm->base) {
		dev_err(&pdev->dev, "ioremap failed\n");
		return -ENODEV;
	}

	dwc3 = platform_device_alloc("dwc3-msm", -1);
	if (!dwc3) {
		dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
		return -ENOMEM;
	}

	dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);

	dwc3->dev.parent = &pdev->dev;
	dwc3->dev.dma_mask = pdev->dev.dma_mask;
	dwc3->dev.dma_parms = pdev->dev.dma_parms;
	msm->resource_size = resource_size(res);
	msm->dev = &pdev->dev;
	msm->dwc3 = dwc3;

	if (of_property_read_u32(node, "qcom,dwc-usb3-msm-dbm-eps",
				 &msm->dbm_num_eps)) {
		dev_err(&pdev->dev,
			"unable to read platform data num of dbm eps\n");
		msm->dbm_num_eps = DBM_MAX_EPS;
	}

	if (msm->dbm_num_eps > DBM_MAX_EPS) {
		dev_err(&pdev->dev,
			"Driver doesn't support number of DBM EPs. "
			"max: %d, dbm_num_eps: %d\n",
			DBM_MAX_EPS, msm->dbm_num_eps);
		ret = -ENODEV;
		goto err1;
	}

	ret = platform_device_add_resources(dwc3, pdev->resource,
		pdev->num_resources);
	if (ret) {
		dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
		goto err1;
	}

	ret = platform_device_add(dwc3);
	if (ret) {
		dev_err(&pdev->dev, "failed to register dwc3 device\n");
		goto err1;
	}

	return 0;

err1:
	platform_device_put(dwc3);

	return ret;
}

static int __devexit dwc3_msm_remove(struct platform_device *pdev)
{
	struct dwc3_msm	*msm = platform_get_drvdata(pdev);

	platform_device_unregister(msm->dwc3);

	return 0;
}

static const struct of_device_id of_dwc3_matach[] = {
	{
		.compatible = "qcom,dwc-usb3-msm",
	},
	{ },
};
MODULE_DEVICE_TABLE(of, of_dwc3_matach);

static struct platform_driver dwc3_msm_driver = {
	.probe		= dwc3_msm_probe,
	.remove		= __devexit_p(dwc3_msm_remove),
	.driver		= {
		.name	= "msm-dwc3",
		.of_match_table	= of_dwc3_matach,
	},
};

MODULE_LICENSE("GPLV2");
MODULE_DESCRIPTION("DesignWare USB3 MSM Glue Layer");

static int __devinit dwc3_msm_init(void)
{
	return platform_driver_register(&dwc3_msm_driver);
}
module_init(dwc3_msm_init);

static void __exit dwc3_msm_exit(void)
{
	platform_driver_unregister(&dwc3_msm_driver);
}
module_exit(dwc3_msm_exit);