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 <chao.xie@marvell.com>
   5  *        Neil Zhang <zhangwm@marvell.com>
   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/usb/of.h>
  15 #include <linux/platform_data/mv_usb.h>
  16 #include <linux/io.h>
  17
  18 #include <linux/usb/hcd.h>
  19
  20 #include "ehci.h"
  21
  22 /* registers */
  23 #define U2x_CAPREGS_OFFSET       0x100
  24
  25 #define CAPLENGTH_MASK         (0xff)
  26
  27 #define hcd_to_ehci_hcd_mv(h) ((struct ehci_hcd_mv *)hcd_to_ehci(h)->priv)
  28
  29 struct ehci_hcd_mv {
  30         /* Which mode does this ehci running OTG/Host ? */
  31         int mode;
  32
  33         void __iomem *base;
  34         void __iomem *cap_regs;
  35         void __iomem *op_regs;
  36
  37         struct usb_phy *otg;
  38         struct clk *clk;
  39
  40         struct phy *phy;
  41
  42         int (*set_vbus)(unsigned int vbus);
  43 };
  44
  45 static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
  46 {
  47         int retval;
  48
  49         retval = clk_prepare_enable(ehci_mv->clk);
  50         if (retval)
  51                 return retval;
  52
  53         retval = phy_init(ehci_mv->phy);
  54         if (retval)
  55                 clk_disable_unprepare(ehci_mv->clk);
  56
  57         return retval;
  58 }
  59
  60 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
  61 {
  62         phy_exit(ehci_mv->phy);
  63         clk_disable_unprepare(ehci_mv->clk);
  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         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  71         u32 status;
  72         int retval;
  73
  74         if (ehci_mv == NULL) {
  75                 dev_err(dev, "Can not find private ehci data\n");
  76                 return -ENODEV;
  77         }
  78
  79         hcd->has_tt = 1;
  80
  81         retval = ehci_setup(hcd);
  82         if (retval)
  83                 dev_err(dev, "ehci_setup failed %d\n", retval);
  84
  85         if (of_usb_get_phy_mode(dev->of_node) == USBPHY_INTERFACE_MODE_HSIC) {
  86                 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
  87                 status |= PORT_TEST_FORCE;
  88                 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
  89                 status &= ~PORT_TEST_FORCE;
  90                 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
  91         }
  92
  93         return retval;
  94 }
  95
  96 static struct hc_driver __read_mostly ehci_platform_hc_driver;
  97
  98 static const struct ehci_driver_overrides platform_overrides __initconst = {
  99         .reset =                mv_ehci_reset,
 100         .extra_priv_size =      sizeof(struct ehci_hcd_mv),
 101 };
 102
 103 static int mv_ehci_probe(struct platform_device *pdev)
 104 {
 105         struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
 106         struct usb_hcd *hcd;
 107         struct ehci_hcd *ehci;
 108         struct ehci_hcd_mv *ehci_mv;
 109         struct resource *r;
 110         int retval;
 111         u32 offset;
 112         u32 status;
 113
 114         if (usb_disabled())
 115                 return -ENODEV;
 116
 117         hcd = usb_create_hcd(&ehci_platform_hc_driver, &pdev->dev, dev_name(&pdev->dev));
 118         if (!hcd)
 119                 return -ENOMEM;
 120
 121         platform_set_drvdata(pdev, hcd);
 122         ehci_mv = hcd_to_ehci_hcd_mv(hcd);
 123
 124         ehci_mv->mode = MV_USB_MODE_HOST;
 125         if (pdata) {
 126                 ehci_mv->mode = pdata->mode;
 127                 ehci_mv->set_vbus = pdata->set_vbus;
 128         }
 129
 130         ehci_mv->phy = devm_phy_optional_get(&pdev->dev, "usb");
 131         if (IS_ERR(ehci_mv->phy)) {
 132                 retval = PTR_ERR(ehci_mv->phy);
 133                 if (retval != -EPROBE_DEFER)
 134                         dev_err(&pdev->dev, "Failed to get phy.\n");
 135                 goto err_put_hcd;
 136         }
 137
 138         ehci_mv->clk = devm_clk_get(&pdev->dev, NULL);
 139         if (IS_ERR(ehci_mv->clk)) {
 140                 dev_err(&pdev->dev, "error getting clock\n");
 141                 retval = PTR_ERR(ehci_mv->clk);
 142                 goto err_put_hcd;
 143         }
 144
 145         ehci_mv->base = devm_platform_get_and_ioremap_resource(pdev, 0, &r);
 146         if (IS_ERR(ehci_mv->base)) {
 147                 retval = PTR_ERR(ehci_mv->base);
 148                 goto err_put_hcd;
 149         }
 150
 151         retval = mv_ehci_enable(ehci_mv);
 152         if (retval) {
 153                 dev_err(&pdev->dev, "init phy error %d\n", retval);
 154                 goto err_put_hcd;
 155         }
 156
 157         ehci_mv->cap_regs =
 158                 (void __iomem *) ((unsigned long) ehci_mv->base + U2x_CAPREGS_OFFSET);
 159         offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
 160         ehci_mv->op_regs =
 161                 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
 162
 163         hcd->rsrc_start = r->start;
 164         hcd->rsrc_len = resource_size(r);
 165         hcd->regs = ehci_mv->op_regs;
 166
 167         retval = platform_get_irq(pdev, 0);
 168         if (retval < 0)
 169                 goto err_disable_clk;
 170         hcd->irq = retval;
 171
 172         ehci = hcd_to_ehci(hcd);
 173         ehci->caps = (struct ehci_caps __iomem *) ehci_mv->cap_regs;
 174
 175         if (ehci_mv->mode == MV_USB_MODE_OTG) {
 176                 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 177                 if (IS_ERR(ehci_mv->otg)) {
 178                         retval = PTR_ERR(ehci_mv->otg);
 179
 180                         if (retval == -ENXIO)
 181                                 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
 182                                                 "must have CONFIG_USB_PHY enabled\n");
 183                         else
 184                                 dev_err(&pdev->dev,
 185                                                 "unable to find transceiver\n");
 186                         goto err_disable_clk;
 187                 }
 188
 189                 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
 190                 if (retval < 0) {
 191                         dev_err(&pdev->dev,
 192                                 "unable to register with transceiver\n");
 193                         retval = -ENODEV;
 194                         goto err_disable_clk;
 195                 }
 196                 /* otg will enable clock before use as host */
 197                 mv_ehci_disable(ehci_mv);
 198         } else {
 199                 if (ehci_mv->set_vbus)
 200                         ehci_mv->set_vbus(1);
 201
 202                 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
 203                 if (retval) {
 204                         dev_err(&pdev->dev,
 205                                 "failed to add hcd with err %d\n", retval);
 206                         goto err_set_vbus;
 207                 }
 208                 device_wakeup_enable(hcd->self.controller);
 209         }
 210
 211         if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_HSIC) {
 212                 status = ehci_readl(ehci, &ehci->regs->port_status[0]);
 213                 /* These "reserved" bits actually enable HSIC mode. */
 214                 status |= BIT(25);
 215                 status &= ~GENMASK(31, 30);
 216                 ehci_writel(ehci, status, &ehci->regs->port_status[0]);
 217         }
 218
 219         dev_info(&pdev->dev,
 220                  "successful find EHCI device with regs 0x%p irq %d"
 221                  " working in %s mode\n", hcd->regs, hcd->irq,
 222                  ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
 223
 224         return 0;
 225
 226 err_set_vbus:
 227         if (ehci_mv->set_vbus)
 228                 ehci_mv->set_vbus(0);
 229 err_disable_clk:
 230         mv_ehci_disable(ehci_mv);
 231 err_put_hcd:
 232         usb_put_hcd(hcd);
 233
 234         return retval;
 235 }
 236
 237 static void mv_ehci_remove(struct platform_device *pdev)
 238 {
 239         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 240         struct ehci_hcd_mv *ehci_mv = hcd_to_ehci_hcd_mv(hcd);
 241
 242         if (hcd->rh_registered)
 243                 usb_remove_hcd(hcd);
 244
 245         if (!IS_ERR_OR_NULL(ehci_mv->otg))
 246                 otg_set_host(ehci_mv->otg->otg, NULL);
 247
 248         if (ehci_mv->mode == MV_USB_MODE_HOST) {
 249                 if (ehci_mv->set_vbus)
 250                         ehci_mv->set_vbus(0);
 251
 252                 mv_ehci_disable(ehci_mv);
 253         }
 254
 255         usb_put_hcd(hcd);
 256 }
 257
 258 static const struct platform_device_id ehci_id_table[] = {
 259         {"pxa-u2oehci", 0},
 260         {"pxa-sph", 0},
 261         {},
 262 };
 263
 264 static void mv_ehci_shutdown(struct platform_device *pdev)
 265 {
 266         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 267
 268         if (!hcd->rh_registered)
 269                 return;
 270
 271         if (hcd->driver->shutdown)
 272                 hcd->driver->shutdown(hcd);
 273 }
 274
 275 static const struct of_device_id ehci_mv_dt_ids[] = {
 276         { .compatible = "marvell,pxau2o-ehci", },
 277         {},
 278 };
 279
 280 static struct platform_driver ehci_mv_driver = {
 281         .probe = mv_ehci_probe,
 282         .remove_new = mv_ehci_remove,
 283         .shutdown = mv_ehci_shutdown,
 284         .driver = {
 285                 .name = "mv-ehci",
 286                 .bus = &platform_bus_type,
 287                 .of_match_table = ehci_mv_dt_ids,
 288         },
 289         .id_table = ehci_id_table,
 290 };
 291
 292 static int __init ehci_platform_init(void)
 293 {
 294         if (usb_disabled())
 295                 return -ENODEV;
 296
 297         ehci_init_driver(&ehci_platform_hc_driver, &platform_overrides);
 298         return platform_driver_register(&ehci_mv_driver);
 299 }
 300 module_init(ehci_platform_init);
 301
 302 static void __exit ehci_platform_cleanup(void)
 303 {
 304         platform_driver_unregister(&ehci_mv_driver);
 305 }
 306 module_exit(ehci_platform_cleanup);
 307
 308 MODULE_DESCRIPTION("Marvell EHCI driver");
 309 MODULE_AUTHOR("Chao Xie <chao.xie@marvell.com>");
 310 MODULE_AUTHOR("Neil Zhang <zhangwm@marvell.com>");
 311 MODULE_ALIAS("mv-ehci");
 312 MODULE_LICENSE("GPL");
 313 MODULE_DEVICE_TABLE(of, ehci_mv_dt_ids);