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d28a9689c9
Adds Exynos Specific Glue layer to support USB peripherals on Samsung Exynos5 chips. [ balbi@ti.com : prevent compilation of Exynos glue layer on platforms which don't provide clk API implementation ] Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
152 lines
3.3 KiB
C
152 lines
3.3 KiB
C
/**
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* dwc3-exynos.c - Samsung EXYNOS DWC3 Specific Glue layer
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Anton Tikhomirov <av.tikhomirov@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/platform_data/dwc3-exynos.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/clk.h>
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#include "core.h"
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struct dwc3_exynos {
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struct platform_device *dwc3;
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struct device *dev;
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struct clk *clk;
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};
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static int __devinit dwc3_exynos_probe(struct platform_device *pdev)
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{
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struct dwc3_exynos_data *pdata = pdev->dev.platform_data;
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struct platform_device *dwc3;
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struct dwc3_exynos *exynos;
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struct clk *clk;
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int devid;
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int ret = -ENOMEM;
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exynos = kzalloc(sizeof(*exynos), GFP_KERNEL);
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if (!exynos) {
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dev_err(&pdev->dev, "not enough memory\n");
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goto err0;
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}
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platform_set_drvdata(pdev, exynos);
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devid = dwc3_get_device_id();
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if (devid < 0)
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goto err1;
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dwc3 = platform_device_alloc("dwc3", devid);
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if (!dwc3) {
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dev_err(&pdev->dev, "couldn't allocate dwc3 device\n");
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goto err2;
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}
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clk = clk_get(&pdev->dev, "usbdrd30");
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if (IS_ERR(clk)) {
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dev_err(&pdev->dev, "couldn't get clock\n");
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ret = -EINVAL;
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goto err3;
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}
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dma_set_coherent_mask(&dwc3->dev, pdev->dev.coherent_dma_mask);
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dwc3->dev.parent = &pdev->dev;
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dwc3->dev.dma_mask = pdev->dev.dma_mask;
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dwc3->dev.dma_parms = pdev->dev.dma_parms;
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exynos->dwc3 = dwc3;
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exynos->dev = &pdev->dev;
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exynos->clk = clk;
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clk_enable(exynos->clk);
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/* PHY initialization */
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if (!pdata) {
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dev_dbg(&pdev->dev, "missing platform data\n");
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} else {
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if (pdata->phy_init)
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pdata->phy_init(pdev, pdata->phy_type);
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}
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ret = platform_device_add_resources(dwc3, pdev->resource,
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pdev->num_resources);
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if (ret) {
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dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n");
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goto err4;
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}
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ret = platform_device_add(dwc3);
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if (ret) {
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dev_err(&pdev->dev, "failed to register dwc3 device\n");
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goto err4;
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}
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return 0;
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err4:
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, pdata->phy_type);
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clk_disable(clk);
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clk_put(clk);
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err3:
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platform_device_put(dwc3);
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err2:
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dwc3_put_device_id(devid);
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err1:
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kfree(exynos);
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err0:
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return ret;
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}
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static int __devexit dwc3_exynos_remove(struct platform_device *pdev)
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{
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struct dwc3_exynos *exynos = platform_get_drvdata(pdev);
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struct dwc3_exynos_data *pdata = pdev->dev.platform_data;
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platform_device_unregister(exynos->dwc3);
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dwc3_put_device_id(exynos->dwc3->id);
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if (pdata && pdata->phy_exit)
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pdata->phy_exit(pdev, pdata->phy_type);
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clk_disable(exynos->clk);
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clk_put(exynos->clk);
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kfree(exynos);
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return 0;
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}
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static struct platform_driver dwc3_exynos_driver = {
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.probe = dwc3_exynos_probe,
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.remove = __devexit_p(dwc3_exynos_remove),
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.driver = {
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.name = "exynos-dwc3",
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},
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};
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module_platform_driver(dwc3_exynos_driver);
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MODULE_ALIAS("platform:exynos-dwc3");
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MODULE_AUTHOR("Anton Tikhomirov <av.tikhomirov@samsung.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
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