ohci-st.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ST OHCI driver
   4  *
   5  * Copyright (C) 2014 STMicroelectronics – All Rights Reserved
   6  *
   7  * Author: Peter Griffin <peter.griffin@linaro.org>
   8  *
   9  * Derived from ohci-platform.c
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/dma-mapping.h>
  14 #include <linux/hrtimer.h>
  15 #include <linux/io.h>
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/err.h>
  19 #include <linux/phy/phy.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/reset.h>
  22 #include <linux/usb/ohci_pdriver.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/hcd.h>
  25
  26 #include "ohci.h"
  27
  28 #define USB_MAX_CLKS 3
  29
  30 struct st_ohci_platform_priv {
  31         struct clk *clks[USB_MAX_CLKS];
  32         struct clk *clk48;
  33         struct reset_control *rst;
  34         struct reset_control *pwr;
  35         struct phy *phy;
  36 };
  37
  38 #define DRIVER_DESC "OHCI STMicroelectronics driver"
  39
  40 #define hcd_to_ohci_priv(h) \
  41         ((struct st_ohci_platform_priv *)hcd_to_ohci(h)->priv)
  42
  43 static int st_ohci_platform_power_on(struct platform_device *dev)
  44 {
  45         struct usb_hcd *hcd = platform_get_drvdata(dev);
  46         struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  47         int clk, ret;
  48
  49         ret = reset_control_deassert(priv->pwr);
  50         if (ret)
  51                 return ret;
  52
  53         ret = reset_control_deassert(priv->rst);
  54         if (ret)
  55                 goto err_assert_power;
  56
  57         /* some SoCs don't have a dedicated 48Mhz clock, but those that do
  58            need the rate to be explicitly set */
  59         if (priv->clk48) {
  60                 ret = clk_set_rate(priv->clk48, 48000000);
  61                 if (ret)
  62                         goto err_assert_reset;
  63         }
  64
  65         for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) {
  66                 ret = clk_prepare_enable(priv->clks[clk]);
  67                 if (ret)
  68                         goto err_disable_clks;
  69         }
  70
  71         ret = phy_init(priv->phy);
  72         if (ret)
  73                 goto err_disable_clks;
  74
  75         ret = phy_power_on(priv->phy);
  76         if (ret)
  77                 goto err_exit_phy;
  78
  79         return 0;
  80
  81 err_exit_phy:
  82         phy_exit(priv->phy);
  83 err_disable_clks:
  84         while (--clk >= 0)
  85                 clk_disable_unprepare(priv->clks[clk]);
  86 err_assert_reset:
  87         reset_control_assert(priv->rst);
  88 err_assert_power:
  89         reset_control_assert(priv->pwr);
  90
  91         return ret;
  92 }
  93
  94 static void st_ohci_platform_power_off(struct platform_device *dev)
  95 {
  96         struct usb_hcd *hcd = platform_get_drvdata(dev);
  97         struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
  98
  99         int clk;
 100
 101         reset_control_assert(priv->pwr);
 102
 103         reset_control_assert(priv->rst);
 104
 105         phy_power_off(priv->phy);
 106
 107         phy_exit(priv->phy);
 108
 109         for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--)
 110                 if (priv->clks[clk])
 111                         clk_disable_unprepare(priv->clks[clk]);
 112 }
 113
 114 static struct hc_driver __read_mostly ohci_platform_hc_driver;
 115
 116 static const struct ohci_driver_overrides platform_overrides __initconst = {
 117         .product_desc =         "ST OHCI controller",
 118         .extra_priv_size =      sizeof(struct st_ohci_platform_priv),
 119 };
 120
 121 static struct usb_ohci_pdata ohci_platform_defaults = {
 122         .power_on =             st_ohci_platform_power_on,
 123         .power_suspend =        st_ohci_platform_power_off,
 124         .power_off =            st_ohci_platform_power_off,
 125 };
 126
 127 static int st_ohci_platform_probe(struct platform_device *dev)
 128 {
 129         struct usb_hcd *hcd;
 130         struct resource *res_mem;
 131         struct usb_ohci_pdata *pdata = &ohci_platform_defaults;
 132         struct st_ohci_platform_priv *priv;
 133         int err, irq, clk = 0;
 134
 135         if (usb_disabled())
 136                 return -ENODEV;
 137
 138         irq = platform_get_irq(dev, 0);
 139         if (irq < 0)
 140                 return irq;
 141
 142         hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev,
 143                         dev_name(&dev->dev));
 144         if (!hcd)
 145                 return -ENOMEM;
 146
 147         platform_set_drvdata(dev, hcd);
 148         dev->dev.platform_data = pdata;
 149         priv = hcd_to_ohci_priv(hcd);
 150
 151         priv->phy = devm_phy_get(&dev->dev, "usb");
 152         if (IS_ERR(priv->phy)) {
 153                 err = PTR_ERR(priv->phy);
 154                 goto err_put_hcd;
 155         }
 156
 157         for (clk = 0; clk < USB_MAX_CLKS; clk++) {
 158                 priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 159                 if (IS_ERR(priv->clks[clk])) {
 160                         err = PTR_ERR(priv->clks[clk]);
 161                         if (err == -EPROBE_DEFER)
 162                                 goto err_put_clks;
 163                         priv->clks[clk] = NULL;
 164                         break;
 165                 }
 166         }
 167
 168         /* some SoCs don't have a dedicated 48Mhz clock, but those that
 169            do need the rate to be explicitly set */
 170         priv->clk48 = devm_clk_get(&dev->dev, "clk48");
 171         if (IS_ERR(priv->clk48)) {
 172                 dev_info(&dev->dev, "48MHz clk not found\n");
 173                 priv->clk48 = NULL;
 174         }
 175
 176         priv->pwr =
 177                 devm_reset_control_get_optional_shared(&dev->dev, "power");
 178         if (IS_ERR(priv->pwr)) {
 179                 err = PTR_ERR(priv->pwr);
 180                 goto err_put_clks;
 181         }
 182
 183         priv->rst =
 184                 devm_reset_control_get_optional_shared(&dev->dev, "softreset");
 185         if (IS_ERR(priv->rst)) {
 186                 err = PTR_ERR(priv->rst);
 187                 goto err_put_clks;
 188         }
 189
 190         if (pdata->power_on) {
 191                 err = pdata->power_on(dev);
 192                 if (err < 0)
 193                         goto err_power;
 194         }
 195
 196         hcd->regs = devm_platform_get_and_ioremap_resource(dev, 0, &res_mem);
 197         if (IS_ERR(hcd->regs)) {
 198                 err = PTR_ERR(hcd->regs);
 199                 goto err_power;
 200         }
 201         hcd->rsrc_start = res_mem->start;
 202         hcd->rsrc_len = resource_size(res_mem);
 203
 204         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 205         if (err)
 206                 goto err_power;
 207
 208         device_wakeup_enable(hcd->self.controller);
 209
 210         platform_set_drvdata(dev, hcd);
 211
 212         return err;
 213
 214 err_power:
 215         if (pdata->power_off)
 216                 pdata->power_off(dev);
 217
 218 err_put_clks:
 219         while (--clk >= 0)
 220                 clk_put(priv->clks[clk]);
 221 err_put_hcd:
 222         if (pdata == &ohci_platform_defaults)
 223                 dev->dev.platform_data = NULL;
 224
 225         usb_put_hcd(hcd);
 226
 227         return err;
 228 }
 229
 230 static void st_ohci_platform_remove(struct platform_device *dev)
 231 {
 232         struct usb_hcd *hcd = platform_get_drvdata(dev);
 233         struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev);
 234         struct st_ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 235         int clk;
 236
 237         usb_remove_hcd(hcd);
 238
 239         if (pdata->power_off)
 240                 pdata->power_off(dev);
 241
 242
 243         for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++)
 244                 clk_put(priv->clks[clk]);
 245
 246         usb_put_hcd(hcd);
 247
 248         if (pdata == &ohci_platform_defaults)
 249                 dev->dev.platform_data = NULL;
 250 }
 251
 252 #ifdef CONFIG_PM_SLEEP
 253
 254 static int st_ohci_suspend(struct device *dev)
 255 {
 256         struct usb_hcd *hcd = dev_get_drvdata(dev);
 257         struct usb_ohci_pdata *pdata = dev->platform_data;
 258         struct platform_device *pdev = to_platform_device(dev);
 259         bool do_wakeup = device_may_wakeup(dev);
 260         int ret;
 261
 262         ret = ohci_suspend(hcd, do_wakeup);
 263         if (ret)
 264                 return ret;
 265
 266         if (pdata->power_suspend)
 267                 pdata->power_suspend(pdev);
 268
 269         return ret;
 270 }
 271
 272 static int st_ohci_resume(struct device *dev)
 273 {
 274         struct usb_hcd *hcd = dev_get_drvdata(dev);
 275         struct usb_ohci_pdata *pdata = dev_get_platdata(dev);
 276         struct platform_device *pdev = to_platform_device(dev);
 277         int err;
 278
 279         if (pdata->power_on) {
 280                 err = pdata->power_on(pdev);
 281                 if (err < 0)
 282                         return err;
 283         }
 284
 285         ohci_resume(hcd, false);
 286         return 0;
 287 }
 288
 289 static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume);
 290
 291 #endif /* CONFIG_PM_SLEEP */
 292
 293 static const struct of_device_id st_ohci_platform_ids[] = {
 294         { .compatible = "st,st-ohci-300x", },
 295         { /* sentinel */ }
 296 };
 297 MODULE_DEVICE_TABLE(of, st_ohci_platform_ids);
 298
 299 static struct platform_driver ohci_platform_driver = {
 300         .probe          = st_ohci_platform_probe,
 301         .remove_new     = st_ohci_platform_remove,
 302         .shutdown       = usb_hcd_platform_shutdown,
 303         .driver         = {
 304                 .name   = "st-ohci",
 305 #ifdef CONFIG_PM_SLEEP
 306                 .pm     = &st_ohci_pm_ops,
 307 #endif
 308                 .of_match_table = st_ohci_platform_ids,
 309         }
 310 };
 311
 312 static int __init ohci_platform_init(void)
 313 {
 314         if (usb_disabled())
 315                 return -ENODEV;
 316
 317         ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides);
 318         return platform_driver_register(&ohci_platform_driver);
 319 }
 320 module_init(ohci_platform_init);
 321
 322 static void __exit ohci_platform_cleanup(void)
 323 {
 324         platform_driver_unregister(&ohci_platform_driver);
 325 }
 326 module_exit(ohci_platform_cleanup);
 327
 328 MODULE_DESCRIPTION(DRIVER_DESC);
 329 MODULE_AUTHOR("Peter Griffin <peter.griffin@linaro.org>");
 330 MODULE_LICENSE("GPL");