drivers/phy/phy-omap-usb2.c

   1 /*
   2  * omap-usb2.c - USB PHY, talking to musb controller in OMAP.
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * Author: Kishon Vijay Abraham I <kishon@ti.com>
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/slab.h>
  22 #include <linux/of.h>
  23 #include <linux/io.h>
  24 #include <linux/usb/omap_usb.h>
  25 #include <linux/usb/phy_companion.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28 #include <linux/pm_runtime.h>
  29 #include <linux/delay.h>
  30 #include <linux/usb/omap_control_usb.h>
  31 #include <linux/phy/phy.h>
  32 #include <linux/of_platform.h>
  33
  34 /**
  35  * omap_usb2_set_comparator - links the comparator present in the sytem with
  36  *      this phy
  37  * @comparator - the companion phy(comparator) for this phy
  38  *
  39  * The phy companion driver should call this API passing the phy_companion
  40  * filled with set_vbus and start_srp to be used by usb phy.
  41  *
  42  * For use by phy companion driver
  43  */
  44 int omap_usb2_set_comparator(struct phy_companion *comparator)
  45 {
  46         struct omap_usb *phy;
  47         struct usb_phy  *x = usb_get_phy(USB_PHY_TYPE_USB2);
  48
  49         if (IS_ERR(x))
  50                 return -ENODEV;
  51
  52         phy = phy_to_omapusb(x);
  53         phy->comparator = comparator;
  54         return 0;
  55 }
  56 EXPORT_SYMBOL_GPL(omap_usb2_set_comparator);
  57
  58 static int omap_usb_set_vbus(struct usb_otg *otg, bool enabled)
  59 {
  60         struct omap_usb *phy = phy_to_omapusb(otg->phy);
  61
  62         if (!phy->comparator)
  63                 return -ENODEV;
  64
  65         return phy->comparator->set_vbus(phy->comparator, enabled);
  66 }
  67
  68 static int omap_usb_start_srp(struct usb_otg *otg)
  69 {
  70         struct omap_usb *phy = phy_to_omapusb(otg->phy);
  71
  72         if (!phy->comparator)
  73                 return -ENODEV;
  74
  75         return phy->comparator->start_srp(phy->comparator);
  76 }
  77
  78 static int omap_usb_set_host(struct usb_otg *otg, struct usb_bus *host)
  79 {
  80         struct usb_phy  *phy = otg->phy;
  81
  82         otg->host = host;
  83         if (!host)
  84                 phy->state = OTG_STATE_UNDEFINED;
  85
  86         return 0;
  87 }
  88
  89 static int omap_usb_set_peripheral(struct usb_otg *otg,
  90                 struct usb_gadget *gadget)
  91 {
  92         struct usb_phy  *phy = otg->phy;
  93
  94         otg->gadget = gadget;
  95         if (!gadget)
  96                 phy->state = OTG_STATE_UNDEFINED;
  97
  98         return 0;
  99 }
 100
 101 static int omap_usb2_suspend(struct usb_phy *x, int suspend)
 102 {
 103         struct omap_usb *phy = phy_to_omapusb(x);
 104         int ret;
 105
 106         if (suspend && !phy->is_suspended) {
 107                 omap_control_usb_phy_power(phy->control_dev, 0);
 108                 pm_runtime_put_sync(phy->dev);
 109                 phy->is_suspended = 1;
 110         } else if (!suspend && phy->is_suspended) {
 111                 ret = pm_runtime_get_sync(phy->dev);
 112                 if (ret < 0) {
 113                         dev_err(phy->dev, "get_sync failed with err %d\n", ret);
 114                         return ret;
 115                 }
 116                 omap_control_usb_phy_power(phy->control_dev, 1);
 117                 phy->is_suspended = 0;
 118         }
 119
 120         return 0;
 121 }
 122
 123 static int omap_usb_power_off(struct phy *x)
 124 {
 125         struct omap_usb *phy = phy_get_drvdata(x);
 126
 127         omap_control_usb_phy_power(phy->control_dev, 0);
 128
 129         return 0;
 130 }
 131
 132 static int omap_usb_power_on(struct phy *x)
 133 {
 134         struct omap_usb *phy = phy_get_drvdata(x);
 135
 136         omap_control_usb_phy_power(phy->control_dev, 1);
 137
 138         return 0;
 139 }
 140
 141 static struct phy_ops ops = {
 142         .power_on       = omap_usb_power_on,
 143         .power_off      = omap_usb_power_off,
 144         .owner          = THIS_MODULE,
 145 };
 146
 147 static int omap_usb2_probe(struct platform_device *pdev)
 148 {
 149         struct omap_usb *phy;
 150         struct phy *generic_phy;
 151         struct phy_provider *phy_provider;
 152         struct usb_otg *otg;
 153         struct device_node *node = pdev->dev.of_node;
 154         struct device_node *control_node;
 155         struct platform_device *control_pdev;
 156
 157         if (!node)
 158                 return -EINVAL;
 159
 160         phy = devm_kzalloc(&pdev->dev, sizeof(*phy), GFP_KERNEL);
 161         if (!phy) {
 162                 dev_err(&pdev->dev, "unable to allocate memory for USB2 PHY\n");
 163                 return -ENOMEM;
 164         }
 165
 166         otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
 167         if (!otg) {
 168                 dev_err(&pdev->dev, "unable to allocate memory for USB OTG\n");
 169                 return -ENOMEM;
 170         }
 171
 172         phy->dev                = &pdev->dev;
 173
 174         phy->phy.dev            = phy->dev;
 175         phy->phy.label          = "omap-usb2";
 176         phy->phy.set_suspend    = omap_usb2_suspend;
 177         phy->phy.otg            = otg;
 178         phy->phy.type           = USB_PHY_TYPE_USB2;
 179
 180         phy_provider = devm_of_phy_provider_register(phy->dev,
 181                         of_phy_simple_xlate);
 182         if (IS_ERR(phy_provider))
 183                 return PTR_ERR(phy_provider);
 184
 185         control_node = of_parse_phandle(node, "ctrl-module", 0);
 186         if (!control_node) {
 187                 dev_err(&pdev->dev, "Failed to get control device phandle\n");
 188                 return -EINVAL;
 189         }
 190
 191         control_pdev = of_find_device_by_node(control_node);
 192         if (!control_pdev) {
 193                 dev_err(&pdev->dev, "Failed to get control device\n");
 194                 return -EINVAL;
 195         }
 196
 197         phy->control_dev = &control_pdev->dev;
 198
 199         phy->is_suspended       = 1;
 200         omap_control_usb_phy_power(phy->control_dev, 0);
 201
 202         otg->set_host           = omap_usb_set_host;
 203         otg->set_peripheral     = omap_usb_set_peripheral;
 204         otg->set_vbus           = omap_usb_set_vbus;
 205         otg->start_srp          = omap_usb_start_srp;
 206         otg->phy                = &phy->phy;
 207
 208         platform_set_drvdata(pdev, phy);
 209         pm_runtime_enable(phy->dev);
 210
 211         generic_phy = devm_phy_create(phy->dev, &ops, NULL);
 212         if (IS_ERR(generic_phy))
 213                 return PTR_ERR(generic_phy);
 214
 215         phy_set_drvdata(generic_phy, phy);
 216
 217         phy->wkupclk = devm_clk_get(phy->dev, "usb_phy_cm_clk32k");
 218         if (IS_ERR(phy->wkupclk)) {
 219                 dev_err(&pdev->dev, "unable to get usb_phy_cm_clk32k\n");
 220                 return PTR_ERR(phy->wkupclk);
 221         }
 222         clk_prepare(phy->wkupclk);
 223
 224         phy->optclk = devm_clk_get(phy->dev, "usb_otg_ss_refclk960m");
 225         if (IS_ERR(phy->optclk))
 226                 dev_vdbg(&pdev->dev, "unable to get refclk960m\n");
 227         else
 228                 clk_prepare(phy->optclk);
 229
 230         usb_add_phy_dev(&phy->phy);
 231
 232         return 0;
 233 }
 234
 235 static int omap_usb2_remove(struct platform_device *pdev)
 236 {
 237         struct omap_usb *phy = platform_get_drvdata(pdev);
 238
 239         clk_unprepare(phy->wkupclk);
 240         if (!IS_ERR(phy->optclk))
 241                 clk_unprepare(phy->optclk);
 242         usb_remove_phy(&phy->phy);
 243
 244         return 0;
 245 }
 246
 247 #ifdef CONFIG_PM_RUNTIME
 248
 249 static int omap_usb2_runtime_suspend(struct device *dev)
 250 {
 251         struct platform_device  *pdev = to_platform_device(dev);
 252         struct omap_usb *phy = platform_get_drvdata(pdev);
 253
 254         clk_disable(phy->wkupclk);
 255         if (!IS_ERR(phy->optclk))
 256                 clk_disable(phy->optclk);
 257
 258         return 0;
 259 }
 260
 261 static int omap_usb2_runtime_resume(struct device *dev)
 262 {
 263         struct platform_device  *pdev = to_platform_device(dev);
 264         struct omap_usb *phy = platform_get_drvdata(pdev);
 265         int ret;
 266
 267         ret = clk_enable(phy->wkupclk);
 268         if (ret < 0) {
 269                 dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
 270                 goto err0;
 271         }
 272
 273         if (!IS_ERR(phy->optclk)) {
 274                 ret = clk_enable(phy->optclk);
 275                 if (ret < 0) {
 276                         dev_err(phy->dev, "Failed to enable optclk %d\n", ret);
 277                         goto err1;
 278                 }
 279         }
 280
 281         return 0;
 282
 283 err1:
 284         clk_disable(phy->wkupclk);
 285
 286 err0:
 287         return ret;
 288 }
 289
 290 static const struct dev_pm_ops omap_usb2_pm_ops = {
 291         SET_RUNTIME_PM_OPS(omap_usb2_runtime_suspend, omap_usb2_runtime_resume,
 292                 NULL)
 293 };
 294
 295 #define DEV_PM_OPS     (&omap_usb2_pm_ops)
 296 #else
 297 #define DEV_PM_OPS     NULL
 298 #endif
 299
 300 #ifdef CONFIG_OF
 301 static const struct of_device_id omap_usb2_id_table[] = {
 302         { .compatible = "ti,omap-usb2" },
 303         {}
 304 };
 305 MODULE_DEVICE_TABLE(of, omap_usb2_id_table);
 306 #endif
 307
 308 static struct platform_driver omap_usb2_driver = {
 309         .probe          = omap_usb2_probe,
 310         .remove         = omap_usb2_remove,
 311         .driver         = {
 312                 .name   = "omap-usb2",
 313                 .owner  = THIS_MODULE,
 314                 .pm     = DEV_PM_OPS,
 315                 .of_match_table = of_match_ptr(omap_usb2_id_table),
 316         },
 317 };
 318
 319 module_platform_driver(omap_usb2_driver);
 320
 321 MODULE_ALIAS("platform: omap_usb2");
 322 MODULE_AUTHOR("Texas Instruments Inc.");
 323 MODULE_DESCRIPTION("OMAP USB2 phy driver");
 324 MODULE_LICENSE("GPL v2");