drivers/usb/host/ehci-mv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
   4  * Author: Chao Xie <[email protected]>
   5  *        Neil Zhang <[email protected]>
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/clk.h>
  12 #include <linux/err.h>
  13 #include <linux/usb/otg.h>
  14 #include <linux/platform_data/mv_usb.h>
  15 #include <linux/io.h>
  16
  17 #include <linux/usb/hcd.h>
  18
  19 #include "ehci.h"
  20
  21 /* registers */
  22 #define U2x_CAPREGS_OFFSET       0x100
  23
  24 #define CAPLENGTH_MASK         (0xff)
  25
  26 #define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
  27
  28 struct ehci_hcd_mv {
  29         /* Which mode does this ehci running OTG/Host ? */
  30         int mode;
  31
  32         void __iomem *base;
  33         void __iomem *cap_regs;
  34         void __iomem *op_regs;
  35
  36         struct usb_phy *otg;
  37         struct clk *clk;
  38
  39         struct phy *phy;
  40
  41         int (*set_vbus)(unsigned int vbus);
  42 };
  43
  44 static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
  45 {
  46         clk_prepare_enable(ehci_mv->clk);
  47 }
  48
  49 static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
  50 {
  51         clk_disable_unprepare(ehci_mv->clk);
  52 }
  53
  54 static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
  55 {
  56         ehci_clock_enable(ehci_mv);
  57         return phy_init(ehci_mv->phy);
  58 }
  59
  60 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
  61 {
  62         phy_exit(ehci_mv->phy);
  63         ehci_clock_disable(ehci_mv);
  64 }
  65
  66 static int mv_ehci_reset(struct usb_hcd *hcd)
  67 {
  68         struct device *dev = hcd->self.controller;
  69         struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
  70         int retval;
  71
  72         if (ehci_mv == NULL) {
  73                 dev_err(dev, "Can not find private ehci data\n");
  74                 return -ENODEV;
  75         }
  76
  77         hcd->has_tt = 1;
  78
  79         retval = ehci_setup(hcd);
  80         if (retval)
  81                 dev_err(dev, "ehci_setup failed %d\n", retval);
  82
  83         return retval;
  84 }
  85
  86 static struct hc_driver __read_mostly ehci_platform_hc_driver;
  87
  88 static const struct ehci_driver_overrides platform_overrides __initconst = {
  89         .reset =                mv_ehci_reset,
  90         .extra_priv_size =      sizeof(struct ehci_hcd_mv),
  91 };
  92
  93 static int mv_ehci_probe(struct platform_device *pdev)
  94 {
  95         struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
  96         struct usb_hcd *hcd;
  97         struct ehci_hcd *ehci;
  98         struct ehci_hcd_mv *ehci_mv;
  99         struct resource *r;
 100         int retval = -ENODEV;
 101         u32 offset;
 102
 103         if (usb_disabled())
 104                 return -ENODEV;
 105
 106         hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, "mv ehci");
 107         if (!hcd)
 108                 return -ENOMEM;
 109
 110         platform_set_drvdata(pdev, hcd);
 111         ehci_mv = hcd_to_ehci_hcd_mv(hcd);
 112
 113         ehci_mv->mode = MV_USB_MODE_HOST;
 114         if (pdata) {
 115                 ehci_mv->mode = pdata->mode;
 116                 ehci_mv->set_vbus = pdata->set_vbus;
 117         }
 118
 119         ehci_mv->phy = devm_phy_get(&pdev->dev, "usb");
 120         if (IS_ERR(ehci_mv->phy)) {
 121                 retval = PTR_ERR(ehci_mv->phy);
 122                 if (retval != -EPROBE_DEFER)
 123                         dev_err(&pdev->dev, "Failed to get phy.\n");
 124                 goto err_put_hcd;
 125         }
 126
 127         ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
 128         if (IS_ERR(ehci_mv->clk)) {
 129                 dev_err(&pdev->dev, "error getting clock\n");
 130                 retval = PTR_ERR(ehci_mv->clk);
 131                 goto err_put_hcd;
 132         }
 133
 134
 135
 136         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 137         ehci_mv->base = devm_ioremap_resource(&pdev->dev, r);
 138         if (IS_ERR(ehci_mv->base)) {
 139                 retval = PTR_ERR(ehci_mv->base);
 140                 goto err_put_hcd;
 141         }
 142
 143         retval = mv_ehci_enable(ehci_mv);
 144         if (retval) {
 145                 dev_err(&pdev->dev, "init phy error %d\n", retval);
 146                 goto err_put_hcd;
 147         }
 148
 149         ehci_mv->cap_regs =
 150                 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
 151         offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
 152         ehci_mv->op_regs =
 153                 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
 154
 155         hcd->rsrc_start = r->start;
 156         hcd->rsrc_len = resource_size(r);
 157         hcd->regs = ehci_mv->op_regs;
 158
 159         hcd->irq = platform_get_irq(pdev, 0);
 160         if (!hcd->irq) {
 161                 dev_err(&pdev->dev, "Cannot get irq.");
 162                 retval = -ENODEV;
 163                 goto err_disable_clk;
 164         }
 165
 166         ehci = hcd_to_ehci(hcd);
 167         ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
 168
 169         if (ehci_mv->mode == MV_USB_MODE_OTG) {
 170                 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 171                 if (IS_ERR(ehci_mv->otg)) {
 172                         retval = PTR_ERR(ehci_mv->otg);
 173
 174                         if (retval == -ENXIO)
 175                                 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
 176                                                 "must have CONFIG_USB_PHY enabled\n");
 177                         else
 178                                 dev_err(&pdev->dev,
 179                                                 "unable to find transceiver\n");
 180                         goto err_disable_clk;
 181                 }
 182
 183                 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
 184                 if (retval < 0) {
 185                         dev_err(&pdev->dev,
 186                                 "unable to register with transceiver\n");
 187                         retval = -ENODEV;
 188                         goto err_disable_clk;
 189                 }
 190                 /* otg will enable clock before use as host */
 191                 mv_ehci_disable(ehci_mv);
 192         } else {
 193                 if (ehci_mv->set_vbus)
 194                         ehci_mv->set_vbus(1);
 195
 196                 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
 197                 if (retval) {
 198                         dev_err(&pdev->dev,
 199                                 "failed to add hcd with err %d\n", retval);
 200                         goto err_set_vbus;
 201                 }
 202                 device_wakeup_enable(hcd->self.controller);
 203         }
 204
 205         dev_info(&pdev->dev,
 206                  "successful find EHCI device with regs 0x%p irq %d"
 207                  " working in %s mode\n", hcd->regs, hcd->irq,
 208                  ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
 209
 210         return 0;
 211
 212 err_set_vbus:
 213         if (ehci_mv->set_vbus)
 214                 ehci_mv->set_vbus(0);
 215 err_disable_clk:
 216         mv_ehci_disable(ehci_mv);
 217 err_put_hcd:
 218         usb_put_hcd(hcd);
 219
 220         return retval;
 221 }
 222
 223 static int mv_ehci_remove(struct platform_device *pdev)
 224 {
 225         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 226         struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
 227
 228         if (hcd->rh_registered)
 229                 usb_remove_hcd(hcd);
 230
 231         if (!IS_ERR_OR_NULL(ehci_mv->otg))
 232                 otg_set_host(ehci_mv->otg->otg, NULL);
 233
 234         if (ehci_mv->mode == MV_USB_MODE_HOST) {
 235                 if (ehci_mv->set_vbus)
 236                         ehci_mv->set_vbus(0);
 237
 238                 mv_ehci_disable(ehci_mv);
 239         }
 240
 241         usb_put_hcd(hcd);
 242
 243         return 0;
 244 }
 245
 246 MODULE_ALIAS("mv-ehci");
 247
 248 static const struct platform_device_id ehci_id_table[] = {
 249         {"pxa-u2oehci", PXA_U2OEHCI},
 250         {"pxa-sph", PXA_SPH},
 251         {"mmp3-hsic", MMP3_HSIC},
 252         {"mmp3-fsic", MMP3_FSIC},
 253         {},
 254 };
 255
 256 static void mv_ehci_shutdown(struct platform_device *pdev)
 257 {
 258         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 259
 260         if (!hcd->rh_registered)
 261                 return;
 262
 263         if (hcd->driver->shutdown)
 264                 hcd->driver->shutdown(hcd);
 265 }
 266
 267 static const struct of_device_id ehci_mv_dt_ids[] = {
 268         { .compatible = "marvell,pxau2o-ehci", },
 269         {},
 270 };
 271
 272 static struct platform_driver ehci_mv_driver = {
 273         .probe = mv_ehci_probe,
 274         .remove = mv_ehci_remove,
 275         .shutdown = mv_ehci_shutdown,
 276         .driver = {
 277                 .name = "mv-ehci",
 278                 .bus = &platform_bus_type,
 279                 .of_match_table = ehci_mv_dt_ids,
 280         },
 281         .id_table = ehci_id_table,
 282 };
 283
 284 static int __init ehci_platform_init(void)
 285 {
 286         if (usb_disabled())
 287                 return -ENODEV;
 288
 289         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 290         return platform_driver_register(&ehci_mv_driver);
 291 }
 292 module_init(ehci_platform_init);
 293
 294 static void __exit ehci_platform_cleanup(void)
 295 {
 296         platform_driver_unregister(&ehci_mv_driver);
 297 }
 298 module_exit(ehci_platform_cleanup);
 299
 300 MODULE_DESCRIPTION("Marvell EHCI driver");
 301 MODULE_AUTHOR("Chao Xie <[email protected]>");
 302 MODULE_AUTHOR("Neil Zhang <[email protected]>");
 303 MODULE_ALIAS("mv-ehci");
 304 MODULE_LICENSE("GPL");
 305 MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);