302 lines
6.9 KiB
C
302 lines
6.9 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 version 2 of
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* the License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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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/dma-mapping.h>
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#include <linux/clk.h>
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#include <linux/usb/otg.h>
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#include <linux/usb/usb_phy_generic.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/regulator/consumer.h>
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struct dwc3_exynos {
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struct platform_device *usb2_phy;
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struct platform_device *usb3_phy;
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struct device *dev;
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struct clk *clk;
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struct clk *susp_clk;
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struct clk *axius_clk;
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struct regulator *vdd33;
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struct regulator *vdd10;
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};
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static int dwc3_exynos_register_phys(struct dwc3_exynos *exynos)
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{
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struct usb_phy_generic_platform_data pdata;
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struct platform_device *pdev;
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int ret;
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memset(&pdata, 0x00, sizeof(pdata));
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pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
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if (!pdev)
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return -ENOMEM;
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exynos->usb2_phy = pdev;
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pdata.type = USB_PHY_TYPE_USB2;
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pdata.gpio_reset = -1;
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ret = platform_device_add_data(exynos->usb2_phy, &pdata, sizeof(pdata));
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if (ret)
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goto err1;
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pdev = platform_device_alloc("usb_phy_generic", PLATFORM_DEVID_AUTO);
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if (!pdev) {
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ret = -ENOMEM;
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goto err1;
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}
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exynos->usb3_phy = pdev;
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pdata.type = USB_PHY_TYPE_USB3;
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ret = platform_device_add_data(exynos->usb3_phy, &pdata, sizeof(pdata));
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if (ret)
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goto err2;
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ret = platform_device_add(exynos->usb2_phy);
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if (ret)
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goto err2;
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ret = platform_device_add(exynos->usb3_phy);
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if (ret)
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goto err3;
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return 0;
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err3:
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platform_device_del(exynos->usb2_phy);
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err2:
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platform_device_put(exynos->usb3_phy);
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err1:
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platform_device_put(exynos->usb2_phy);
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return ret;
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}
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static int dwc3_exynos_remove_child(struct device *dev, void *unused)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int dwc3_exynos_probe(struct platform_device *pdev)
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{
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struct dwc3_exynos *exynos;
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struct device *dev = &pdev->dev;
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struct device_node *node = dev->of_node;
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int ret;
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exynos = devm_kzalloc(dev, sizeof(*exynos), GFP_KERNEL);
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if (!exynos)
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return -ENOMEM;
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/*
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* Right now device-tree probed devices don't get dma_mask set.
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* Since shared usb code relies on it, set it here for now.
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* Once we move to full device tree support this will vanish off.
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*/
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ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
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if (ret)
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return ret;
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platform_set_drvdata(pdev, exynos);
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ret = dwc3_exynos_register_phys(exynos);
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if (ret) {
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dev_err(dev, "couldn't register PHYs\n");
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return ret;
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}
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exynos->dev = dev;
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exynos->clk = devm_clk_get(dev, "usbdrd30");
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if (IS_ERR(exynos->clk)) {
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dev_err(dev, "couldn't get clock\n");
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return -EINVAL;
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}
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clk_prepare_enable(exynos->clk);
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exynos->susp_clk = devm_clk_get(dev, "usbdrd30_susp_clk");
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if (IS_ERR(exynos->susp_clk)) {
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dev_dbg(dev, "no suspend clk specified\n");
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exynos->susp_clk = NULL;
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}
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clk_prepare_enable(exynos->susp_clk);
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if (of_device_is_compatible(node, "samsung,exynos7-dwusb3")) {
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exynos->axius_clk = devm_clk_get(dev, "usbdrd30_axius_clk");
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if (IS_ERR(exynos->axius_clk)) {
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dev_err(dev, "no AXI UpScaler clk specified\n");
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return -ENODEV;
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}
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clk_prepare_enable(exynos->axius_clk);
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} else {
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exynos->axius_clk = NULL;
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}
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exynos->vdd33 = devm_regulator_get(dev, "vdd33");
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if (IS_ERR(exynos->vdd33)) {
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ret = PTR_ERR(exynos->vdd33);
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goto err2;
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}
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ret = regulator_enable(exynos->vdd33);
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if (ret) {
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dev_err(dev, "Failed to enable VDD33 supply\n");
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goto err2;
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}
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exynos->vdd10 = devm_regulator_get(dev, "vdd10");
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if (IS_ERR(exynos->vdd10)) {
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ret = PTR_ERR(exynos->vdd10);
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goto err3;
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}
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ret = regulator_enable(exynos->vdd10);
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if (ret) {
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dev_err(dev, "Failed to enable VDD10 supply\n");
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goto err3;
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}
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if (node) {
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ret = of_platform_populate(node, NULL, NULL, dev);
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if (ret) {
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dev_err(dev, "failed to add dwc3 core\n");
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goto err4;
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}
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} else {
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dev_err(dev, "no device node, failed to add dwc3 core\n");
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ret = -ENODEV;
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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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regulator_disable(exynos->vdd10);
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err3:
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regulator_disable(exynos->vdd33);
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err2:
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clk_disable_unprepare(exynos->axius_clk);
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clk_disable_unprepare(exynos->susp_clk);
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clk_disable_unprepare(exynos->clk);
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return ret;
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}
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static int 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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device_for_each_child(&pdev->dev, NULL, dwc3_exynos_remove_child);
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platform_device_unregister(exynos->usb2_phy);
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platform_device_unregister(exynos->usb3_phy);
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clk_disable_unprepare(exynos->axius_clk);
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clk_disable_unprepare(exynos->susp_clk);
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clk_disable_unprepare(exynos->clk);
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regulator_disable(exynos->vdd33);
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regulator_disable(exynos->vdd10);
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return 0;
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}
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static const struct of_device_id exynos_dwc3_match[] = {
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{ .compatible = "samsung,exynos5250-dwusb3" },
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{ .compatible = "samsung,exynos7-dwusb3" },
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{},
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};
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MODULE_DEVICE_TABLE(of, exynos_dwc3_match);
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#ifdef CONFIG_PM_SLEEP
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static int dwc3_exynos_suspend(struct device *dev)
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{
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struct dwc3_exynos *exynos = dev_get_drvdata(dev);
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clk_disable(exynos->axius_clk);
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clk_disable(exynos->clk);
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regulator_disable(exynos->vdd33);
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regulator_disable(exynos->vdd10);
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return 0;
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}
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static int dwc3_exynos_resume(struct device *dev)
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{
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struct dwc3_exynos *exynos = dev_get_drvdata(dev);
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int ret;
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ret = regulator_enable(exynos->vdd33);
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if (ret) {
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dev_err(dev, "Failed to enable VDD33 supply\n");
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return ret;
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}
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ret = regulator_enable(exynos->vdd10);
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if (ret) {
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dev_err(dev, "Failed to enable VDD10 supply\n");
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return ret;
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}
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clk_enable(exynos->clk);
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clk_enable(exynos->axius_clk);
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/* runtime set active to reflect active state. */
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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return 0;
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}
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static const struct dev_pm_ops dwc3_exynos_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(dwc3_exynos_suspend, dwc3_exynos_resume)
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};
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#define DEV_PM_OPS (&dwc3_exynos_dev_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif /* CONFIG_PM_SLEEP */
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static struct platform_driver dwc3_exynos_driver = {
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.probe = dwc3_exynos_probe,
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.remove = dwc3_exynos_remove,
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.driver = {
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.name = "exynos-dwc3",
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.of_match_table = exynos_dwc3_match,
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.pm = DEV_PM_OPS,
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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 v2");
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MODULE_DESCRIPTION("DesignWare USB3 EXYNOS Glue Layer");
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