drivers/usb/host/ehci-mv.c

   1 /*
   2  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
   3  * Author: Chao Xie <chao.xie@marvell.com>
   4  *        Neil Zhang <zhangwm@marvell.com>
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/usb/otg.h>
  18 #include <linux/platform_data/mv_usb.h>
  19
  20 #define CAPLENGTH_MASK         (0xff)
  21
  22 struct ehci_hcd_mv {
  23         struct usb_hcd *hcd;
  24
  25         /* Which mode does this ehci running OTG/Host ? */
  26         int mode;
  27
  28         void __iomem *phy_regs;
  29         void __iomem *cap_regs;
  30         void __iomem *op_regs;
  31
  32         struct usb_phy *otg;
  33
  34         struct mv_usb_platform_data *pdata;
  35
  36         /* clock source and total clock number */
  37         unsigned int clknum;
  38         struct clk *clk[0];
  39 };
  40
  41 static void ehci_clock_enable(struct ehci_hcd_mv *ehci_mv)
  42 {
  43         unsigned int i;
  44
  45         for (i = 0; i < ehci_mv->clknum; i++)
  46                 clk_prepare_enable(ehci_mv->clk[i]);
  47 }
  48
  49 static void ehci_clock_disable(struct ehci_hcd_mv *ehci_mv)
  50 {
  51         unsigned int i;
  52
  53         for (i = 0; i < ehci_mv->clknum; i++)
  54                 clk_disable_unprepare(ehci_mv->clk[i]);
  55 }
  56
  57 static int mv_ehci_enable(struct ehci_hcd_mv *ehci_mv)
  58 {
  59         int retval;
  60
  61         ehci_clock_enable(ehci_mv);
  62         if (ehci_mv->pdata->phy_init) {
  63                 retval = ehci_mv->pdata->phy_init(ehci_mv->phy_regs);
  64                 if (retval)
  65                         return retval;
  66         }
  67
  68         return 0;
  69 }
  70
  71 static void mv_ehci_disable(struct ehci_hcd_mv *ehci_mv)
  72 {
  73         if (ehci_mv->pdata->phy_deinit)
  74                 ehci_mv->pdata->phy_deinit(ehci_mv->phy_regs);
  75         ehci_clock_disable(ehci_mv);
  76 }
  77
  78 static int mv_ehci_reset(struct usb_hcd *hcd)
  79 {
  80         struct device *dev = hcd->self.controller;
  81         struct ehci_hcd_mv *ehci_mv = dev_get_drvdata(dev);
  82         int retval;
  83
  84         if (ehci_mv == NULL) {
  85                 dev_err(dev, "Can not find private ehci data\n");
  86                 return -ENODEV;
  87         }
  88
  89         hcd->has_tt = 1;
  90
  91         retval = ehci_setup(hcd);
  92         if (retval)
  93                 dev_err(dev, "ehci_setup failed %d\n", retval);
  94
  95         return retval;
  96 }
  97
  98 static const struct hc_driver mv_ehci_hc_driver = {
  99         .description = hcd_name,
 100         .product_desc = "Marvell EHCI",
 101         .hcd_priv_size = sizeof(struct ehci_hcd),
 102
 103         /*
 104          * generic hardware linkage
 105          */
 106         .irq = ehci_irq,
 107         .flags = HCD_MEMORY | HCD_USB2,
 108
 109         /*
 110          * basic lifecycle operations
 111          */
 112         .reset = mv_ehci_reset,
 113         .start = ehci_run,
 114         .stop = ehci_stop,
 115         .shutdown = ehci_shutdown,
 116
 117         /*
 118          * managing i/o requests and associated device resources
 119          */
 120         .urb_enqueue = ehci_urb_enqueue,
 121         .urb_dequeue = ehci_urb_dequeue,
 122         .endpoint_disable = ehci_endpoint_disable,
 123         .endpoint_reset = ehci_endpoint_reset,
 124         .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 125
 126         /*
 127          * scheduling support
 128          */
 129         .get_frame_number = ehci_get_frame,
 130
 131         /*
 132          * root hub support
 133          */
 134         .hub_status_data = ehci_hub_status_data,
 135         .hub_control = ehci_hub_control,
 136         .bus_suspend = ehci_bus_suspend,
 137         .bus_resume = ehci_bus_resume,
 138 };
 139
 140 static int mv_ehci_probe(struct platform_device *pdev)
 141 {
 142         struct mv_usb_platform_data *pdata = pdev->dev.platform_data;
 143         struct usb_hcd *hcd;
 144         struct ehci_hcd *ehci;
 145         struct ehci_hcd_mv *ehci_mv;
 146         struct resource *r;
 147         int clk_i, retval = -ENODEV;
 148         u32 offset;
 149         size_t size;
 150
 151         if (!pdata) {
 152                 dev_err(&pdev->dev, "missing platform_data\n");
 153                 return -ENODEV;
 154         }
 155
 156         if (usb_disabled())
 157                 return -ENODEV;
 158
 159         hcd = usb_create_hcd(&mv_ehci_hc_driver, &pdev->dev, "mv ehci");
 160         if (!hcd)
 161                 return -ENOMEM;
 162
 163         size = sizeof(*ehci_mv) + sizeof(struct clk *) * pdata->clknum;
 164         ehci_mv = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
 165         if (ehci_mv == NULL) {
 166                 dev_err(&pdev->dev, "cannot allocate ehci_hcd_mv\n");
 167                 retval = -ENOMEM;
 168                 goto err_put_hcd;
 169         }
 170
 171         platform_set_drvdata(pdev, ehci_mv);
 172         ehci_mv->pdata = pdata;
 173         ehci_mv->hcd = hcd;
 174
 175         ehci_mv->clknum = pdata->clknum;
 176         for (clk_i = 0; clk_i < ehci_mv->clknum; clk_i++) {
 177                 ehci_mv->clk[clk_i] =
 178                     devm_clk_get(&pdev->dev, pdata->clkname[clk_i]);
 179                 if (IS_ERR(ehci_mv->clk[clk_i])) {
 180                         dev_err(&pdev->dev, "error get clck \"%s\"\n",
 181                                 pdata->clkname[clk_i]);
 182                         retval = PTR_ERR(ehci_mv->clk[clk_i]);
 183                         goto err_clear_drvdata;
 184                 }
 185         }
 186
 187         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phyregs");
 188         if (r == NULL) {
 189                 dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
 190                 retval = -ENODEV;
 191                 goto err_clear_drvdata;
 192         }
 193
 194         ehci_mv->phy_regs = devm_ioremap(&pdev->dev, r->start,
 195                                          resource_size(r));
 196         if (ehci_mv->phy_regs == 0) {
 197                 dev_err(&pdev->dev, "failed to map phy I/O memory\n");
 198                 retval = -EFAULT;
 199                 goto err_clear_drvdata;
 200         }
 201
 202         r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "capregs");
 203         if (!r) {
 204                 dev_err(&pdev->dev, "no I/O memory resource defined\n");
 205                 retval = -ENODEV;
 206                 goto err_clear_drvdata;
 207         }
 208
 209         ehci_mv->cap_regs = devm_ioremap(&pdev->dev, r->start,
 210                                          resource_size(r));
 211         if (ehci_mv->cap_regs == NULL) {
 212                 dev_err(&pdev->dev, "failed to map I/O memory\n");
 213                 retval = -EFAULT;
 214                 goto err_clear_drvdata;
 215         }
 216
 217         retval = mv_ehci_enable(ehci_mv);
 218         if (retval) {
 219                 dev_err(&pdev->dev, "init phy error %d\n", retval);
 220                 goto err_clear_drvdata;
 221         }
 222
 223         offset = readl(ehci_mv->cap_regs) & CAPLENGTH_MASK;
 224         ehci_mv->op_regs =
 225                 (void __iomem *) ((unsigned long) ehci_mv->cap_regs + offset);
 226
 227         hcd->rsrc_start = r->start;
 228         hcd->rsrc_len = r->end - r->start + 1;
 229         hcd->regs = ehci_mv->op_regs;
 230
 231         hcd->irq = platform_get_irq(pdev, 0);
 232         if (!hcd->irq) {
 233                 dev_err(&pdev->dev, "Cannot get irq.");
 234                 retval = -ENODEV;
 235                 goto err_disable_clk;
 236         }
 237
 238         ehci = hcd_to_ehci(hcd);
 239         ehci->caps = (struct ehci_caps *) ehci_mv->cap_regs;
 240
 241         ehci_mv->mode = pdata->mode;
 242         if (ehci_mv->mode == MV_USB_MODE_OTG) {
 243 #ifdef CONFIG_USB_OTG_UTILS
 244                 ehci_mv->otg = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
 245                 if (IS_ERR_OR_NULL(ehci_mv->otg)) {
 246                         dev_err(&pdev->dev,
 247                                 "unable to find transceiver\n");
 248                         retval = -ENODEV;
 249                         goto err_disable_clk;
 250                 }
 251
 252                 retval = otg_set_host(ehci_mv->otg->otg, &hcd->self);
 253                 if (retval < 0) {
 254                         dev_err(&pdev->dev,
 255                                 "unable to register with transceiver\n");
 256                         retval = -ENODEV;
 257                         goto err_disable_clk;
 258                 }
 259                 /* otg will enable clock before use as host */
 260                 mv_ehci_disable(ehci_mv);
 261 #else
 262                 dev_info(&pdev->dev, "MV_USB_MODE_OTG "
 263                          "must have CONFIG_USB_OTG_UTILS enabled\n");
 264                 goto err_disable_clk;
 265 #endif
 266         } else {
 267                 if (pdata->set_vbus)
 268                         pdata->set_vbus(1);
 269
 270                 retval = usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
 271                 if (retval) {
 272                         dev_err(&pdev->dev,
 273                                 "failed to add hcd with err %d\n", retval);
 274                         goto err_set_vbus;
 275                 }
 276         }
 277
 278         if (pdata->private_init)
 279                 pdata->private_init(ehci_mv->op_regs, ehci_mv->phy_regs);
 280
 281         dev_info(&pdev->dev,
 282                  "successful find EHCI device with regs 0x%p irq %d"
 283                  " working in %s mode\n", hcd->regs, hcd->irq,
 284                  ehci_mv->mode == MV_USB_MODE_OTG ? "OTG" : "Host");
 285
 286         return 0;
 287
 288 err_set_vbus:
 289         if (pdata->set_vbus)
 290                 pdata->set_vbus(0);
 291 err_disable_clk:
 292         mv_ehci_disable(ehci_mv);
 293 err_clear_drvdata:
 294         platform_set_drvdata(pdev, NULL);
 295 err_put_hcd:
 296         usb_put_hcd(hcd);
 297
 298         return retval;
 299 }
 300
 301 static int mv_ehci_remove(struct platform_device *pdev)
 302 {
 303         struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
 304         struct usb_hcd *hcd = ehci_mv->hcd;
 305         int clk_i;
 306
 307         if (hcd->rh_registered)
 308                 usb_remove_hcd(hcd);
 309
 310         if (!IS_ERR_OR_NULL(ehci_mv->otg))
 311                 otg_set_host(ehci_mv->otg->otg, NULL);
 312
 313         if (ehci_mv->mode == MV_USB_MODE_HOST) {
 314                 if (ehci_mv->pdata->set_vbus)
 315                         ehci_mv->pdata->set_vbus(0);
 316
 317                 mv_ehci_disable(ehci_mv);
 318         }
 319
 320         platform_set_drvdata(pdev, NULL);
 321
 322         usb_put_hcd(hcd);
 323
 324         return 0;
 325 }
 326
 327 MODULE_ALIAS("mv-ehci");
 328
 329 static const struct platform_device_id ehci_id_table[] = {
 330         {"pxa-u2oehci", PXA_U2OEHCI},
 331         {"pxa-sph", PXA_SPH},
 332         {"mmp3-hsic", MMP3_HSIC},
 333         {"mmp3-fsic", MMP3_FSIC},
 334         {},
 335 };
 336
 337 static void mv_ehci_shutdown(struct platform_device *pdev)
 338 {
 339         struct ehci_hcd_mv *ehci_mv = platform_get_drvdata(pdev);
 340         struct usb_hcd *hcd = ehci_mv->hcd;
 341
 342         if (!hcd->rh_registered)
 343                 return;
 344
 345         if (hcd->driver->shutdown)
 346                 hcd->driver->shutdown(hcd);
 347 }
 348
 349 static struct platform_driver ehci_mv_driver = {
 350         .probe = mv_ehci_probe,
 351         .remove = mv_ehci_remove,
 352         .shutdown = mv_ehci_shutdown,
 353         .driver = {
 354                    .name = "mv-ehci",
 355                    .bus = &platform_bus_type,
 356                    },
 357         .id_table = ehci_id_table,
 358 };