drivers/usb/host/ohci-exynos.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * SAMSUNG EXYNOS USB HOST OHCI Controller
   4  *
   5  * Copyright (C) 2011 Samsung Electronics Co.Ltd
   6  * Author: Jingoo Han <jg1.han@samsung.com>
   7  */
   8
   9 #include <linux/clk.h>
  10 #include <linux/dma-mapping.h>
  11 #include <linux/io.h>
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/usb.h>
  18 #include <linux/usb/hcd.h>
  19
  20 #include "ohci.h"
  21
  22 #define DRIVER_DESC "OHCI EXYNOS driver"
  23
  24 static const char hcd_name[] = "ohci-exynos";
  25 static struct hc_driver __read_mostly exynos_ohci_hc_driver;
  26
  27 #define to_exynos_ohci(hcd) (struct exynos_ohci_hcd *)(hcd_to_ohci(hcd)->priv)
  28
  29 #define PHY_NUMBER 3
  30
  31 struct exynos_ohci_hcd {
  32         struct clk *clk;
  33         struct phy *phy[PHY_NUMBER];
  34 };
  35
  36 static int exynos_ohci_get_phy(struct device *dev,
  37                                 struct exynos_ohci_hcd *exynos_ohci)
  38 {
  39         struct device_node *child;
  40         struct phy *phy;
  41         int phy_number;
  42         int ret;
  43
  44         /* Get PHYs for the controller */
  45         for_each_available_child_of_node(dev->of_node, child) {
  46                 ret = of_property_read_u32(child, "reg", &phy_number);
  47                 if (ret) {
  48                         dev_err(dev, "Failed to parse device tree\n");
  49                         of_node_put(child);
  50                         return ret;
  51                 }
  52
  53                 if (phy_number >= PHY_NUMBER) {
  54                         dev_err(dev, "Invalid number of PHYs\n");
  55                         of_node_put(child);
  56                         return -EINVAL;
  57                 }
  58
  59                 phy = devm_of_phy_get(dev, child, NULL);
  60                 exynos_ohci->phy[phy_number] = phy;
  61                 if (IS_ERR(phy)) {
  62                         ret = PTR_ERR(phy);
  63                         if (ret == -EPROBE_DEFER) {
  64                                 of_node_put(child);
  65                                 return ret;
  66                         } else if (ret != -ENOSYS && ret != -ENODEV) {
  67                                 dev_err(dev,
  68                                         "Error retrieving usb2 phy: %d\n", ret);
  69                                 of_node_put(child);
  70                                 return ret;
  71                         }
  72                 }
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int exynos_ohci_phy_enable(struct device *dev)
  79 {
  80         struct usb_hcd *hcd = dev_get_drvdata(dev);
  81         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
  82         int i;
  83         int ret = 0;
  84
  85         for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
  86                 if (!IS_ERR(exynos_ohci->phy[i]))
  87                         ret = phy_power_on(exynos_ohci->phy[i]);
  88         if (ret)
  89                 for (i--; i >= 0; i--)
  90                         if (!IS_ERR(exynos_ohci->phy[i]))
  91                                 phy_power_off(exynos_ohci->phy[i]);
  92
  93         return ret;
  94 }
  95
  96 static void exynos_ohci_phy_disable(struct device *dev)
  97 {
  98         struct usb_hcd *hcd = dev_get_drvdata(dev);
  99         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 100         int i;
 101
 102         for (i = 0; i < PHY_NUMBER; i++)
 103                 if (!IS_ERR(exynos_ohci->phy[i]))
 104                         phy_power_off(exynos_ohci->phy[i]);
 105 }
 106
 107 static int exynos_ohci_probe(struct platform_device *pdev)
 108 {
 109         struct exynos_ohci_hcd *exynos_ohci;
 110         struct usb_hcd *hcd;
 111         struct resource *res;
 112         int irq;
 113         int err;
 114
 115         /*
 116          * Right now device-tree probed devices don't get dma_mask set.
 117          * Since shared usb code relies on it, set it here for now.
 118          * Once we move to full device tree support this will vanish off.
 119          */
 120         err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
 121         if (err)
 122                 return err;
 123
 124         hcd = usb_create_hcd(&exynos_ohci_hc_driver,
 125                                 &pdev->dev, dev_name(&pdev->dev));
 126         if (!hcd) {
 127                 dev_err(&pdev->dev, "Unable to create HCD\n");
 128                 return -ENOMEM;
 129         }
 130
 131         exynos_ohci = to_exynos_ohci(hcd);
 132
 133         err = exynos_ohci_get_phy(&pdev->dev, exynos_ohci);
 134         if (err)
 135                 goto fail_clk;
 136
 137         exynos_ohci->clk = devm_clk_get(&pdev->dev, "usbhost");
 138
 139         if (IS_ERR(exynos_ohci->clk)) {
 140                 dev_err(&pdev->dev, "Failed to get usbhost clock\n");
 141                 err = PTR_ERR(exynos_ohci->clk);
 142                 goto fail_clk;
 143         }
 144
 145         err = clk_prepare_enable(exynos_ohci->clk);
 146         if (err)
 147                 goto fail_clk;
 148
 149         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 150         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
 151         if (IS_ERR(hcd->regs)) {
 152                 err = PTR_ERR(hcd->regs);
 153                 goto fail_io;
 154         }
 155         hcd->rsrc_start = res->start;
 156         hcd->rsrc_len = resource_size(res);
 157
 158         irq = platform_get_irq(pdev, 0);
 159         if (!irq) {
 160                 dev_err(&pdev->dev, "Failed to get IRQ\n");
 161                 err = -ENODEV;
 162                 goto fail_io;
 163         }
 164
 165         platform_set_drvdata(pdev, hcd);
 166
 167         err = exynos_ohci_phy_enable(&pdev->dev);
 168         if (err) {
 169                 dev_err(&pdev->dev, "Failed to enable USB phy\n");
 170                 goto fail_io;
 171         }
 172
 173         err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 174         if (err) {
 175                 dev_err(&pdev->dev, "Failed to add USB HCD\n");
 176                 goto fail_add_hcd;
 177         }
 178         device_wakeup_enable(hcd->self.controller);
 179         return 0;
 180
 181 fail_add_hcd:
 182         exynos_ohci_phy_disable(&pdev->dev);
 183 fail_io:
 184         clk_disable_unprepare(exynos_ohci->clk);
 185 fail_clk:
 186         usb_put_hcd(hcd);
 187         return err;
 188 }
 189
 190 static int exynos_ohci_remove(struct platform_device *pdev)
 191 {
 192         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 193         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 194
 195         usb_remove_hcd(hcd);
 196
 197         exynos_ohci_phy_disable(&pdev->dev);
 198
 199         clk_disable_unprepare(exynos_ohci->clk);
 200
 201         usb_put_hcd(hcd);
 202
 203         return 0;
 204 }
 205
 206 static void exynos_ohci_shutdown(struct platform_device *pdev)
 207 {
 208         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 209
 210         if (hcd->driver->shutdown)
 211                 hcd->driver->shutdown(hcd);
 212 }
 213
 214 #ifdef CONFIG_PM
 215 static int exynos_ohci_suspend(struct device *dev)
 216 {
 217         struct usb_hcd *hcd = dev_get_drvdata(dev);
 218         struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 219         bool do_wakeup = device_may_wakeup(dev);
 220         int rc = ohci_suspend(hcd, do_wakeup);
 221
 222         if (rc)
 223                 return rc;
 224
 225         exynos_ohci_phy_disable(dev);
 226
 227         clk_disable_unprepare(exynos_ohci->clk);
 228
 229         return 0;
 230 }
 231
 232 static int exynos_ohci_resume(struct device *dev)
 233 {
 234         struct usb_hcd *hcd                     = dev_get_drvdata(dev);
 235         struct exynos_ohci_hcd *exynos_ohci     = to_exynos_ohci(hcd);
 236         int ret;
 237
 238         clk_prepare_enable(exynos_ohci->clk);
 239
 240         ret = exynos_ohci_phy_enable(dev);
 241         if (ret) {
 242                 dev_err(dev, "Failed to enable USB phy\n");
 243                 clk_disable_unprepare(exynos_ohci->clk);
 244                 return ret;
 245         }
 246
 247         ohci_resume(hcd, false);
 248
 249         return 0;
 250 }
 251 #else
 252 #define exynos_ohci_suspend     NULL
 253 #define exynos_ohci_resume      NULL
 254 #endif
 255
 256 static const struct ohci_driver_overrides exynos_overrides __initconst = {
 257         .extra_priv_size =      sizeof(struct exynos_ohci_hcd),
 258 };
 259
 260 static const struct dev_pm_ops exynos_ohci_pm_ops = {
 261         .suspend        = exynos_ohci_suspend,
 262         .resume         = exynos_ohci_resume,
 263 };
 264
 265 #ifdef CONFIG_OF
 266 static const struct of_device_id exynos_ohci_match[] = {
 267         { .compatible = "samsung,exynos4210-ohci" },
 268         {},
 269 };
 270 MODULE_DEVICE_TABLE(of, exynos_ohci_match);
 271 #endif
 272
 273 static struct platform_driver exynos_ohci_driver = {
 274         .probe          = exynos_ohci_probe,
 275         .remove         = exynos_ohci_remove,
 276         .shutdown       = exynos_ohci_shutdown,
 277         .driver = {
 278                 .name   = "exynos-ohci",
 279                 .pm     = &exynos_ohci_pm_ops,
 280                 .of_match_table = of_match_ptr(exynos_ohci_match),
 281         }
 282 };
 283 static int __init ohci_exynos_init(void)
 284 {
 285         if (usb_disabled())
 286                 return -ENODEV;
 287
 288         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 289         ohci_init_driver(&exynos_ohci_hc_driver, &exynos_overrides);
 290         return platform_driver_register(&exynos_ohci_driver);
 291 }
 292 module_init(ohci_exynos_init);
 293
 294 static void __exit ohci_exynos_cleanup(void)
 295 {
 296         platform_driver_unregister(&exynos_ohci_driver);
 297 }
 298 module_exit(ohci_exynos_cleanup);
 299
 300 MODULE_ALIAS("platform:exynos-ohci");
 301 MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");
 302 MODULE_LICENSE("GPL v2");