LXR linux/drivers/usb/phy/phy-am335x.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/module.h>
   3#include <linux/platform_device.h>
   4#include <linux/dma-mapping.h>
   5#include <linux/usb/otg.h>
   6#include <linux/usb/usb_phy_generic.h>
   7#include <linux/slab.h>
   8#include <linux/clk.h>
   9#include <linux/of.h>
  10#include <linux/of_address.h>
  11#include <linux/usb/of.h>
  12
  13#include "phy-am335x-control.h"
  14#include "phy-generic.h"
  15
  16struct am335x_phy {
  17        struct usb_phy_generic usb_phy_gen;
  18        struct phy_control *phy_ctrl;
  19        int id;
  20        enum usb_dr_mode dr_mode;
  21};
  22
  23static int am335x_init(struct usb_phy *phy)
  24{
  25        struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  26
  27        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
  28        return 0;
  29}
  30
  31static void am335x_shutdown(struct usb_phy *phy)
  32{
  33        struct am335x_phy *am_phy = dev_get_drvdata(phy->dev);
  34
  35        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
  36}
  37
  38static int am335x_phy_probe(struct platform_device *pdev)
  39{
  40        struct am335x_phy *am_phy;
  41        struct device *dev = &pdev->dev;
  42        int ret;
  43
  44        am_phy = devm_kzalloc(dev, sizeof(*am_phy), GFP_KERNEL);
  45        if (!am_phy)
  46                return -ENOMEM;
  47
  48        am_phy->phy_ctrl = am335x_get_phy_control(dev);
  49        if (!am_phy->phy_ctrl)
  50                return -EPROBE_DEFER;
  51
  52        am_phy->id = of_alias_get_id(pdev->dev.of_node, "phy");
  53        if (am_phy->id < 0) {
  54                dev_err(&pdev->dev, "Missing PHY id: %d\n", am_phy->id);
  55                return am_phy->id;
  56        }
  57
  58        am_phy->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
  59
  60        ret = usb_phy_gen_create_phy(dev, &am_phy->usb_phy_gen, NULL);
  61        if (ret)
  62                return ret;
  63
  64        am_phy->usb_phy_gen.phy.init = am335x_init;
  65        am_phy->usb_phy_gen.phy.shutdown = am335x_shutdown;
  66
  67        platform_set_drvdata(pdev, am_phy);
  68        device_init_wakeup(dev, true);
  69
  70        /*
  71         * If we leave PHY wakeup enabled then AM33XX wakes up
  72         * immediately from DS0. To avoid this we mark dev->power.can_wakeup
  73         * to false. The same is checked in suspend routine to decide
  74         * on whether to enable PHY wakeup or not.
  75         * PHY wakeup works fine in standby mode, there by allowing us to
  76         * handle remote wakeup, wakeup on disconnect and connect.
  77         */
  78
  79        device_set_wakeup_enable(dev, false);
  80        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
  81
  82        return usb_add_phy_dev(&am_phy->usb_phy_gen.phy);
  83}
  84
  85static int am335x_phy_remove(struct platform_device *pdev)
  86{
  87        struct am335x_phy *am_phy = platform_get_drvdata(pdev);
  88
  89        usb_remove_phy(&am_phy->usb_phy_gen.phy);
  90        return 0;
  91}
  92
  93#ifdef CONFIG_PM_SLEEP
  94static int am335x_phy_suspend(struct device *dev)
  95{
  96        struct am335x_phy *am_phy = dev_get_drvdata(dev);
  97
  98        /*
  99         * Enable phy wakeup only if dev->power.can_wakeup is true.
 100         * Make sure to enable wakeup to support remote wakeup  in
 101         * standby mode ( same is not supported in OFF(DS0) mode).
 102         * Enable it by doing
 103         * echo enabled > /sys/bus/platform/devices/<usb-phy-id>/power/wakeup
 104         */
 105
 106        if (device_may_wakeup(dev))
 107                phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, true);
 108
 109        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, false);
 110
 111        return 0;
 112}
 113
 114static int am335x_phy_resume(struct device *dev)
 115{
 116        struct am335x_phy       *am_phy = dev_get_drvdata(dev);
 117
 118        phy_ctrl_power(am_phy->phy_ctrl, am_phy->id, am_phy->dr_mode, true);
 119
 120        if (device_may_wakeup(dev))
 121                phy_ctrl_wkup(am_phy->phy_ctrl, am_phy->id, false);
 122
 123        return 0;
 124}
 125#endif
 126
 127static SIMPLE_DEV_PM_OPS(am335x_pm_ops, am335x_phy_suspend, am335x_phy_resume);
 128
 129static const struct of_device_id am335x_phy_ids[] = {
 130        { .compatible = "ti,am335x-usb-phy" },
 131        { }
 132};
 133MODULE_DEVICE_TABLE(of, am335x_phy_ids);
 134
 135static struct platform_driver am335x_phy_driver = {
 136        .probe          = am335x_phy_probe,
 137        .remove         = am335x_phy_remove,
 138        .driver         = {
 139                .name   = "am335x-phy-driver",
 140                .pm = &am335x_pm_ops,
 141                .of_match_table = am335x_phy_ids,
 142        },
 143};
 144
 145module_platform_driver(am335x_phy_driver);
 146MODULE_LICENSE("GPL v2");
 147