Quelle  phy-da8xx-usb.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * phy-da8xx-usb - TI DaVinci DA8xx USB PHY driver
 *
 * Copyright (C) 2016 David Lechner <david@lechnology.com>
 */

#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/mfd/da8xx-cfgchip.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_data/phy-da8xx-usb.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>

#define PHY_INIT_BITS (CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN)

struct da8xx_usb_phy {
 struct device  *dev;
 struct phy_provider *phy_provider;
 struct phy  *usb11_phy;
 struct phy  *usb20_phy;
 struct clk  *usb11_clk;
 struct clk  *usb20_clk;
 struct regmap  *regmap;
};

static int da8xx_usb11_phy_power_on(struct phy *phy)
{
 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
 int ret;

 ret = clk_prepare_enable(d_phy->usb11_clk);
 if (ret)
  return ret;

 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM,
     CFGCHIP2_USB1SUSPENDM);

 /*
 * USB1.1 can used USB2.0 output clock as reference clock so this is here to prevent USB2.0
 * from shutting PHY's power when USB1.1 might use it
 */
 pm_runtime_get_sync(d_phy->dev);

 return 0;
}

static int da8xx_usb11_phy_power_off(struct phy *phy)
{
 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);

 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_USB1SUSPENDM, 0);

 clk_disable_unprepare(d_phy->usb11_clk);
 pm_runtime_put_sync(d_phy->dev);

 return 0;
}

static const struct phy_ops da8xx_usb11_phy_ops = {
 .power_on = da8xx_usb11_phy_power_on,
 .power_off = da8xx_usb11_phy_power_off,
 .owner  = THIS_MODULE,
};

static int da8xx_usb20_phy_power_on(struct phy *phy)
{
 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
 int ret;

 ret = clk_prepare_enable(d_phy->usb20_clk);
 if (ret)
  return ret;

 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN, 0);

 return 0;
}

static int da8xx_usb20_phy_power_off(struct phy *phy)
{
 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);

 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGPWRDN,
     CFGCHIP2_OTGPWRDN);

 clk_disable_unprepare(d_phy->usb20_clk);

 return 0;
}

static int da8xx_usb20_phy_set_mode(struct phy *phy,
        enum phy_mode mode, int submode)
{
 struct da8xx_usb_phy *d_phy = phy_get_drvdata(phy);
 u32 val;

 switch (mode) {
 case PHY_MODE_USB_HOST:  /* Force VBUS valid, ID = 0 */
  val = CFGCHIP2_OTGMODE_FORCE_HOST;
  break;
 case PHY_MODE_USB_DEVICE: /* Force VBUS valid, ID = 1 */
  val = CFGCHIP2_OTGMODE_FORCE_DEVICE;
  break;
 case PHY_MODE_USB_OTG: /* Don't override the VBUS/ID comparators */
  val = CFGCHIP2_OTGMODE_NO_OVERRIDE;
  break;
 default:
  return -EINVAL;
 }

 regmap_write_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_OTGMODE_MASK,
     val);

 return 0;
}

static const struct phy_ops da8xx_usb20_phy_ops = {
 .power_on = da8xx_usb20_phy_power_on,
 .power_off = da8xx_usb20_phy_power_off,
 .set_mode = da8xx_usb20_phy_set_mode,
 .owner  = THIS_MODULE,
};

static int __maybe_unused da8xx_runtime_suspend(struct device *dev)
{
 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);

 dev_dbg(dev, "Suspending ...\n");

 regmap_set_bits(d_phy->regmap, CFGCHIP(2), CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN);

 return 0;
}

static int __maybe_unused da8xx_runtime_resume(struct device *dev)
{
 u32 mask = CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN | CFGCHIP2_OTGPWRDN | CFGCHIP2_PHY_PLLON;
 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);
 u32 pll_status;

 regmap_update_bits(d_phy->regmap, CFGCHIP(2), mask, CFGCHIP2_PHY_PLLON);

 dev_dbg(dev, "Resuming ...\n");

 return regmap_read_poll_timeout(d_phy->regmap, CFGCHIP(2), pll_status,
     pll_status & CFGCHIP2_PHYCLKGD, 1000, 500000);
}

static const struct dev_pm_ops da8xx_usb_phy_pm_ops = {
 SET_RUNTIME_PM_OPS(da8xx_runtime_suspend, da8xx_runtime_resume, NULL)
};

static struct phy *da8xx_usb_phy_of_xlate(struct device *dev,
      const struct of_phandle_args *args)
{
 struct da8xx_usb_phy *d_phy = dev_get_drvdata(dev);

 if (!d_phy)
  return ERR_PTR(-ENODEV);

 switch (args->args[0]) {
 case 0:
  return d_phy->usb20_phy;
 case 1:
  return d_phy->usb11_phy;
 default:
  return ERR_PTR(-EINVAL);
 }
}

static int da8xx_usb_phy_probe(struct platform_device *pdev)
{
 struct device  *dev = &pdev->dev;
 struct da8xx_usb_phy_platform_data *pdata = dev->platform_data;
 struct device_node *node = dev->of_node;
 struct da8xx_usb_phy *d_phy;

 d_phy = devm_kzalloc(dev, sizeof(*d_phy), GFP_KERNEL);
 if (!d_phy)
  return -ENOMEM;

 d_phy->dev = dev;

 if (pdata)
  d_phy->regmap = pdata->cfgchip;
 else
  d_phy->regmap = syscon_regmap_lookup_by_compatible(
       "ti,da830-cfgchip");
 if (IS_ERR(d_phy->regmap)) {
  dev_err(dev, "Failed to get syscon\n");
  return PTR_ERR(d_phy->regmap);
 }

 d_phy->usb11_clk = devm_clk_get(dev, "usb1_clk48");
 if (IS_ERR(d_phy->usb11_clk)) {
  dev_err(dev, "Failed to get usb1_clk48\n");
  return PTR_ERR(d_phy->usb11_clk);
 }

 d_phy->usb20_clk = devm_clk_get(dev, "usb0_clk48");
 if (IS_ERR(d_phy->usb20_clk)) {
  dev_err(dev, "Failed to get usb0_clk48\n");
  return PTR_ERR(d_phy->usb20_clk);
 }

 d_phy->usb11_phy = devm_phy_create(dev, node, &da8xx_usb11_phy_ops);
 if (IS_ERR(d_phy->usb11_phy)) {
  dev_err(dev, "Failed to create usb11 phy\n");
  return PTR_ERR(d_phy->usb11_phy);
 }

 d_phy->usb20_phy = devm_phy_create(dev, node, &da8xx_usb20_phy_ops);
 if (IS_ERR(d_phy->usb20_phy)) {
  dev_err(dev, "Failed to create usb20 phy\n");
  return PTR_ERR(d_phy->usb20_phy);
 }

 platform_set_drvdata(pdev, d_phy);
 phy_set_drvdata(d_phy->usb11_phy, d_phy);
 phy_set_drvdata(d_phy->usb20_phy, d_phy);

 if (node) {
  d_phy->phy_provider = devm_of_phy_provider_register(dev,
       da8xx_usb_phy_of_xlate);
  if (IS_ERR(d_phy->phy_provider)) {
   dev_err(dev, "Failed to create phy provider\n");
   return PTR_ERR(d_phy->phy_provider);
  }
 } else {
  int ret;

  ret = phy_create_lookup(d_phy->usb11_phy, "usb-phy",
     "ohci-da8xx");
  if (ret)
   dev_warn(dev, "Failed to create usb11 phy lookup\n");
  ret = phy_create_lookup(d_phy->usb20_phy, "usb-phy",
     "musb-da8xx");
  if (ret)
   dev_warn(dev, "Failed to create usb20 phy lookup\n");
 }

 regmap_write_bits(d_phy->regmap, CFGCHIP(2),
     PHY_INIT_BITS, PHY_INIT_BITS);

 pm_runtime_set_active(dev);
 devm_pm_runtime_enable(dev);
 /*
 * Prevent runtime pm from being ON by default. Users can enable
 * it using power/control in sysfs.
 */
 pm_runtime_forbid(dev);

 return 0;
}

static void da8xx_usb_phy_remove(struct platform_device *pdev)
{
 struct da8xx_usb_phy *d_phy = platform_get_drvdata(pdev);

 if (!pdev->dev.of_node) {
  phy_remove_lookup(d_phy->usb20_phy, "usb-phy", "musb-da8xx");
  phy_remove_lookup(d_phy->usb11_phy, "usb-phy", "ohci-da8xx");
 }
}

static const struct of_device_id da8xx_usb_phy_ids[] = {
 { .compatible = "ti,da830-usb-phy" },
 { }
};
MODULE_DEVICE_TABLE(of, da8xx_usb_phy_ids);

static struct platform_driver da8xx_usb_phy_driver = {
 .probe = da8xx_usb_phy_probe,
 .remove = da8xx_usb_phy_remove,
 .driver = {
  .name = "da8xx-usb-phy",
  .pm = &da8xx_usb_phy_pm_ops,
  .of_match_table = da8xx_usb_phy_ids,
 },
};

module_platform_driver(da8xx_usb_phy_driver);

MODULE_ALIAS("platform:da8xx-usb-phy");
MODULE_AUTHOR("David Lechner ");
MODULE_DESCRIPTION("TI DA8xx USB PHY driver");
MODULE_LICENSE("GPL v2");