/**
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* dwc3-rockchip-inno.c - Rockchip DWC3 Specific Glue layer with INNO PHY
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* Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
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*
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* Authors: William Wu <william.wu@rock-chips.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/clk-provider.h>
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#include <linux/debugfs.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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#include <linux/usb.h>
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#include <linux/usb/hcd.h>
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#include <linux/notifier.h>
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#include <linux/uaccess.h>
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#include <linux/usb/phy.h>
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#include <linux/usb/ch9.h>
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#include "core.h"
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#define XHCI_TSTCTRL_MASK (0xf << 28)
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struct dwc3_rockchip {
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struct device *dev;
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struct clk **clks;
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int num_clocks;
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struct dwc3 *dwc;
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struct usb_phy *phy;
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struct notifier_block u3phy_nb;
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struct work_struct u3_work;
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struct mutex lock;
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};
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static int u3phy_disconnect_det_notifier(struct notifier_block *nb,
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unsigned long event, void *p)
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{
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struct dwc3_rockchip *rockchip =
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container_of(nb, struct dwc3_rockchip, u3phy_nb);
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schedule_work(&rockchip->u3_work);
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return NOTIFY_DONE;
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}
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static void u3phy_disconnect_det_work(struct work_struct *work)
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{
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struct dwc3_rockchip *rockchip =
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container_of(work, struct dwc3_rockchip, u3_work);
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struct usb_hcd *hcd = dev_get_drvdata(&rockchip->dwc->xhci->dev);
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u32 count = 0;
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mutex_lock(&rockchip->lock);
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if (hcd->state != HC_STATE_HALT)
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dwc3_host_exit(rockchip->dwc);
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if (rockchip->phy)
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usb_phy_shutdown(rockchip->phy);
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while (hcd->state != HC_STATE_HALT) {
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if (++count > 1000) {
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dev_err(rockchip->dev,
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"wait for HCD remove 1s timeout!\n");
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break;
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}
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usleep_range(1000, 1100);
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}
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if (hcd->state == HC_STATE_HALT)
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dwc3_host_init(rockchip->dwc);
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if (rockchip->phy)
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usb_phy_init(rockchip->phy);
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mutex_unlock(&rockchip->lock);
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}
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static int dwc3_rockchip_probe(struct platform_device *pdev)
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{
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struct dwc3_rockchip *rockchip;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node, *child;
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struct platform_device *child_pdev;
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unsigned int count;
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int ret;
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int i;
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rockchip = devm_kzalloc(dev, sizeof(*rockchip), GFP_KERNEL);
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if (!rockchip)
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return -ENOMEM;
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child = of_get_child_by_name(np, "dwc3");
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if (!child) {
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dev_err(dev, "failed to find dwc3 core node\n");
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return -ENODEV;
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}
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count = of_clk_get_parent_count(np);
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if (!count)
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return -ENOENT;
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rockchip->num_clocks = count;
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rockchip->clks = devm_kcalloc(dev, rockchip->num_clocks,
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sizeof(struct clk *), GFP_KERNEL);
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if (!rockchip->clks)
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return -ENOMEM;
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platform_set_drvdata(pdev, rockchip);
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rockchip->dev = dev;
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for (i = 0; i < rockchip->num_clocks; i++) {
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struct clk *clk;
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clk = of_clk_get(np, i);
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if (IS_ERR(clk)) {
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ret = PTR_ERR(clk);
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goto err0;
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}
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ret = clk_prepare_enable(clk);
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if (ret < 0) {
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clk_put(clk);
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goto err0;
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}
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rockchip->clks[i] = clk;
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}
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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ret = pm_runtime_get_sync(dev);
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if (ret < 0) {
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dev_err(dev, "get_sync failed with err %d\n", ret);
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goto err1;
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}
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ret = of_platform_populate(np, NULL, NULL, dev);
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if (ret)
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goto err1;
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child_pdev = of_find_device_by_node(child);
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if (!child_pdev) {
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dev_err(dev, "failed to find dwc3 core device\n");
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ret = -ENODEV;
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goto err2;
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}
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rockchip->dwc = platform_get_drvdata(child_pdev);
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if (!rockchip->dwc || !rockchip->dwc->xhci) {
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dev_dbg(dev, "failed to get drvdata dwc3\n");
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ret = -EPROBE_DEFER;
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goto err2;
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}
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mutex_init(&rockchip->lock);
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rockchip->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
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if (rockchip->phy) {
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INIT_WORK(&rockchip->u3_work, u3phy_disconnect_det_work);
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rockchip->u3phy_nb.notifier_call =
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u3phy_disconnect_det_notifier;
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usb_register_notifier(rockchip->phy, &rockchip->u3phy_nb);
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}
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return 0;
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err2:
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of_platform_depopulate(dev);
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err1:
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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err0:
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for (i = 0; i < rockchip->num_clocks && rockchip->clks[i]; i++) {
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if (!pm_runtime_status_suspended(dev))
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clk_disable(rockchip->clks[i]);
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clk_unprepare(rockchip->clks[i]);
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clk_put(rockchip->clks[i]);
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}
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return ret;
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}
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static int dwc3_rockchip_remove(struct platform_device *pdev)
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{
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struct dwc3_rockchip *rockchip = platform_get_drvdata(pdev);
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struct device *dev = &pdev->dev;
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int i;
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of_platform_depopulate(dev);
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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for (i = 0; i < rockchip->num_clocks; i++) {
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if (!pm_runtime_status_suspended(dev))
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clk_disable(rockchip->clks[i]);
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clk_unprepare(rockchip->clks[i]);
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clk_put(rockchip->clks[i]);
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}
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return 0;
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}
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#ifdef CONFIG_PM
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static int dwc3_rockchip_runtime_suspend(struct device *dev)
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{
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struct dwc3_rockchip *rockchip = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < rockchip->num_clocks; i++)
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clk_disable(rockchip->clks[i]);
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return 0;
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}
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static int dwc3_rockchip_runtime_resume(struct device *dev)
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{
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struct dwc3_rockchip *rockchip = dev_get_drvdata(dev);
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int ret;
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int i;
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for (i = 0; i < rockchip->num_clocks; i++) {
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ret = clk_enable(rockchip->clks[i]);
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if (ret < 0) {
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while (--i >= 0)
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clk_disable(rockchip->clks[i]);
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return ret;
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}
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}
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return 0;
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}
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static const struct dev_pm_ops dwc3_rockchip_dev_pm_ops = {
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SET_RUNTIME_PM_OPS(dwc3_rockchip_runtime_suspend,
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dwc3_rockchip_runtime_resume, NULL)
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};
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#define DEV_PM_OPS (&dwc3_rockchip_dev_pm_ops)
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#else
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#define DEV_PM_OPS NULL
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#endif /* CONFIG_PM */
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static const struct of_device_id rockchip_dwc3_match[] = {
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{ .compatible = "rockchip,rk3328-dwc3" },
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, rockchip_dwc3_match);
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static struct platform_driver dwc3_rockchip_driver = {
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.probe = dwc3_rockchip_probe,
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.remove = dwc3_rockchip_remove,
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.driver = {
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.name = "rockchip-inno-dwc3",
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.pm = DEV_PM_OPS,
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.of_match_table = rockchip_dwc3_match,
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},
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};
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module_platform_driver(dwc3_rockchip_driver);
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MODULE_ALIAS("platform:rockchip-inno-dwc3");
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MODULE_AUTHOR("William Wu <william.wu@rock-chips.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("DesignWare USB3 rockchip-inno Glue Layer");
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