drivers/usb/host/fhci-hcd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Freescale QUICC Engine USB Host Controller Driver
   4  *
   5  * Copyright (c) Freescale Semicondutor, Inc. 2006.
   6  *               Shlomi Gridish <gridish@freescale.com>
   7  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   8  * Copyright (c) Logic Product Development, Inc. 2007
   9  *               Peter Barada <peterb@logicpd.com>
  10  * Copyright (c) MontaVista Software, Inc. 2008.
  11  *               Anton Vorontsov <avorontsov@ru.mvista.com>
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/types.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/kernel.h>
  18 #include <linux/delay.h>
  19 #include <linux/errno.h>
  20 #include <linux/list.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/io.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/hcd.h>
  25 #include <linux/of_address.h>
  26 #include <linux/of_irq.h>
  27 #include <linux/of_platform.h>
  28 #include <linux/of_gpio.h>
  29 #include <linux/slab.h>
  30 #include <soc/fsl/qe/qe.h>
  31 #include <asm/fsl_gtm.h>
  32 #include "fhci.h"
  33
  34 void fhci_start_sof_timer(struct fhci_hcd *fhci)
  35 {
  36         fhci_dbg(fhci, "-> %s\n", __func__);
  37
  38         /* clear frame_n */
  39         out_be16(&fhci->pram->frame_num, 0);
  40
  41         out_be16(&fhci->regs->usb_ussft, 0);
  42         setbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
  43
  44         fhci_dbg(fhci, "<- %s\n", __func__);
  45 }
  46
  47 void fhci_stop_sof_timer(struct fhci_hcd *fhci)
  48 {
  49         fhci_dbg(fhci, "-> %s\n", __func__);
  50
  51         clrbits8(&fhci->regs->usb_usmod, USB_MODE_SFTE);
  52         gtm_stop_timer16(fhci->timer);
  53
  54         fhci_dbg(fhci, "<- %s\n", __func__);
  55 }
  56
  57 u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
  58 {
  59         return be16_to_cpu(in_be16(&usb->fhci->regs->usb_ussft) / 12);
  60 }
  61
  62 /* initialize the endpoint zero */
  63 static u32 endpoint_zero_init(struct fhci_usb *usb,
  64                               enum fhci_mem_alloc data_mem,
  65                               u32 ring_len)
  66 {
  67         u32 rc;
  68
  69         rc = fhci_create_ep(usb, data_mem, ring_len);
  70         if (rc)
  71                 return rc;
  72
  73         /* inilialize endpoint registers */
  74         fhci_init_ep_registers(usb, usb->ep0, data_mem);
  75
  76         return 0;
  77 }
  78
  79 /* enable the USB interrupts */
  80 void fhci_usb_enable_interrupt(struct fhci_usb *usb)
  81 {
  82         struct fhci_hcd *fhci = usb->fhci;
  83
  84         if (usb->intr_nesting_cnt == 1) {
  85                 /* initialize the USB interrupt */
  86                 enable_irq(fhci_to_hcd(fhci)->irq);
  87
  88                 /* initialize the event register and mask register */
  89                 out_be16(&usb->fhci->regs->usb_usber, 0xffff);
  90                 out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
  91
  92                 /* enable the timer interrupts */
  93                 enable_irq(fhci->timer->irq);
  94         } else if (usb->intr_nesting_cnt > 1)
  95                 fhci_info(fhci, "unbalanced USB interrupts nesting\n");
  96         usb->intr_nesting_cnt--;
  97 }
  98
  99 /* disable the usb interrupt */
 100 void fhci_usb_disable_interrupt(struct fhci_usb *usb)
 101 {
 102         struct fhci_hcd *fhci = usb->fhci;
 103
 104         if (usb->intr_nesting_cnt == 0) {
 105                 /* disable the timer interrupt */
 106                 disable_irq_nosync(fhci->timer->irq);
 107
 108                 /* disable the usb interrupt */
 109                 disable_irq_nosync(fhci_to_hcd(fhci)->irq);
 110                 out_be16(&usb->fhci->regs->usb_usbmr, 0);
 111         }
 112         usb->intr_nesting_cnt++;
 113 }
 114
 115 /* enable the USB controller */
 116 static u32 fhci_usb_enable(struct fhci_hcd *fhci)
 117 {
 118         struct fhci_usb *usb = fhci->usb_lld;
 119
 120         out_be16(&usb->fhci->regs->usb_usber, 0xffff);
 121         out_be16(&usb->fhci->regs->usb_usbmr, usb->saved_msk);
 122         setbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
 123
 124         mdelay(100);
 125
 126         return 0;
 127 }
 128
 129 /* disable the USB controller */
 130 static u32 fhci_usb_disable(struct fhci_hcd *fhci)
 131 {
 132         struct fhci_usb *usb = fhci->usb_lld;
 133
 134         fhci_usb_disable_interrupt(usb);
 135         fhci_port_disable(fhci);
 136
 137         /* disable the usb controller */
 138         if (usb->port_status == FHCI_PORT_FULL ||
 139                         usb->port_status == FHCI_PORT_LOW)
 140                 fhci_device_disconnected_interrupt(fhci);
 141
 142         clrbits8(&usb->fhci->regs->usb_usmod, USB_MODE_EN);
 143
 144         return 0;
 145 }
 146
 147 /* check the bus state by polling the QE bit on the IO ports */
 148 int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
 149 {
 150         u8 bits = 0;
 151
 152         /* check USBOE,if transmitting,exit */
 153         if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
 154                 return -1;
 155
 156         /* check USBRP */
 157         if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
 158                 bits |= 0x2;
 159
 160         /* check USBRN */
 161         if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
 162                 bits |= 0x1;
 163
 164         return bits;
 165 }
 166
 167 static void fhci_mem_free(struct fhci_hcd *fhci)
 168 {
 169         struct ed *ed;
 170         struct ed *next_ed;
 171         struct td *td;
 172         struct td *next_td;
 173
 174         list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
 175                 list_del(&ed->node);
 176                 kfree(ed);
 177         }
 178
 179         list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
 180                 list_del(&td->node);
 181                 kfree(td);
 182         }
 183
 184         kfree(fhci->vroot_hub);
 185         fhci->vroot_hub = NULL;
 186
 187         kfree(fhci->hc_list);
 188         fhci->hc_list = NULL;
 189 }
 190
 191 static int fhci_mem_init(struct fhci_hcd *fhci)
 192 {
 193         int i;
 194
 195         fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
 196         if (!fhci->hc_list)
 197                 goto err;
 198
 199         INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
 200         INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
 201         INIT_LIST_HEAD(&fhci->hc_list->iso_list);
 202         INIT_LIST_HEAD(&fhci->hc_list->intr_list);
 203         INIT_LIST_HEAD(&fhci->hc_list->done_list);
 204
 205         fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
 206         if (!fhci->vroot_hub)
 207                 goto err;
 208
 209         INIT_LIST_HEAD(&fhci->empty_eds);
 210         INIT_LIST_HEAD(&fhci->empty_tds);
 211
 212         /* initialize work queue to handle done list */
 213         fhci_tasklet.data = (unsigned long)fhci;
 214         fhci->process_done_task = &fhci_tasklet;
 215
 216         for (i = 0; i < MAX_TDS; i++) {
 217                 struct td *td;
 218
 219                 td = kmalloc(sizeof(*td), GFP_KERNEL);
 220                 if (!td)
 221                         goto err;
 222                 fhci_recycle_empty_td(fhci, td);
 223         }
 224         for (i = 0; i < MAX_EDS; i++) {
 225                 struct ed *ed;
 226
 227                 ed = kmalloc(sizeof(*ed), GFP_KERNEL);
 228                 if (!ed)
 229                         goto err;
 230                 fhci_recycle_empty_ed(fhci, ed);
 231         }
 232
 233         fhci->active_urbs = 0;
 234         return 0;
 235 err:
 236         fhci_mem_free(fhci);
 237         return -ENOMEM;
 238 }
 239
 240 /* destroy the fhci_usb structure */
 241 static void fhci_usb_free(void *lld)
 242 {
 243         struct fhci_usb *usb = lld;
 244         struct fhci_hcd *fhci;
 245
 246         if (usb) {
 247                 fhci = usb->fhci;
 248                 fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
 249                 fhci_ep0_free(usb);
 250                 kfree(usb->actual_frame);
 251                 kfree(usb);
 252         }
 253 }
 254
 255 /* initialize the USB */
 256 static int fhci_usb_init(struct fhci_hcd *fhci)
 257 {
 258         struct fhci_usb *usb = fhci->usb_lld;
 259
 260         memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
 261
 262         usb->port_status = FHCI_PORT_DISABLED;
 263         usb->max_frame_usage = FRAME_TIME_USAGE;
 264         usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
 265
 266         usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
 267         if (!usb->actual_frame) {
 268                 fhci_usb_free(usb);
 269                 return -ENOMEM;
 270         }
 271
 272         INIT_LIST_HEAD(&usb->actual_frame->tds_list);
 273
 274         /* initializing registers on chip, clear frame number */
 275         out_be16(&fhci->pram->frame_num, 0);
 276
 277         /* clear rx state */
 278         out_be32(&fhci->pram->rx_state, 0);
 279
 280         /* set mask register */
 281         usb->saved_msk = (USB_E_TXB_MASK |
 282                           USB_E_TXE1_MASK |
 283                           USB_E_IDLE_MASK |
 284                           USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
 285
 286         out_8(&usb->fhci->regs->usb_usmod, USB_MODE_HOST | USB_MODE_EN);
 287
 288         /* clearing the mask register */
 289         out_be16(&usb->fhci->regs->usb_usbmr, 0);
 290
 291         /* initialing the event register */
 292         out_be16(&usb->fhci->regs->usb_usber, 0xffff);
 293
 294         if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
 295                 fhci_usb_free(usb);
 296                 return -EINVAL;
 297         }
 298
 299         return 0;
 300 }
 301
 302 /* initialize the fhci_usb struct and the corresponding data staruct */
 303 static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
 304 {
 305         struct fhci_usb *usb;
 306
 307         /* allocate memory for SCC data structure */
 308         usb = kzalloc(sizeof(*usb), GFP_KERNEL);
 309         if (!usb)
 310                 return NULL;
 311
 312         usb->fhci = fhci;
 313         usb->hc_list = fhci->hc_list;
 314         usb->vroot_hub = fhci->vroot_hub;
 315
 316         usb->transfer_confirm = fhci_transfer_confirm_callback;
 317
 318         return usb;
 319 }
 320
 321 static int fhci_start(struct usb_hcd *hcd)
 322 {
 323         int ret;
 324         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 325
 326         ret = fhci_mem_init(fhci);
 327         if (ret) {
 328                 fhci_err(fhci, "failed to allocate memory\n");
 329                 goto err;
 330         }
 331
 332         fhci->usb_lld = fhci_create_lld(fhci);
 333         if (!fhci->usb_lld) {
 334                 fhci_err(fhci, "low level driver config failed\n");
 335                 ret = -ENOMEM;
 336                 goto err;
 337         }
 338
 339         ret = fhci_usb_init(fhci);
 340         if (ret) {
 341                 fhci_err(fhci, "low level driver initialize failed\n");
 342                 goto err;
 343         }
 344
 345         spin_lock_init(&fhci->lock);
 346
 347         /* connect the virtual root hub */
 348         fhci->vroot_hub->dev_num = 1;   /* this field may be needed to fix */
 349         fhci->vroot_hub->hub.wHubStatus = 0;
 350         fhci->vroot_hub->hub.wHubChange = 0;
 351         fhci->vroot_hub->port.wPortStatus = 0;
 352         fhci->vroot_hub->port.wPortChange = 0;
 353
 354         hcd->state = HC_STATE_RUNNING;
 355
 356         /*
 357          * From here on, hub_wq concurrently accesses the root
 358          * hub; drivers will be talking to enumerated devices.
 359          * (On restart paths, hub_wq already knows about the root
 360          * hub and could find work as soon as we wrote FLAG_CF.)
 361          *
 362          * Before this point the HC was idle/ready.  After, hub_wq
 363          * and device drivers may start it running.
 364          */
 365         fhci_usb_enable(fhci);
 366         return 0;
 367 err:
 368         fhci_mem_free(fhci);
 369         return ret;
 370 }
 371
 372 static void fhci_stop(struct usb_hcd *hcd)
 373 {
 374         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 375
 376         fhci_usb_disable_interrupt(fhci->usb_lld);
 377         fhci_usb_disable(fhci);
 378
 379         fhci_usb_free(fhci->usb_lld);
 380         fhci->usb_lld = NULL;
 381         fhci_mem_free(fhci);
 382 }
 383
 384 static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 385                             gfp_t mem_flags)
 386 {
 387         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 388         u32 pipe = urb->pipe;
 389         int ret;
 390         int i;
 391         int size = 0;
 392         struct urb_priv *urb_priv;
 393         unsigned long flags;
 394
 395         switch (usb_pipetype(pipe)) {
 396         case PIPE_CONTROL:
 397                 /* 1 td fro setup,1 for ack */
 398                 size = 2;
 399         case PIPE_BULK:
 400                 /* one td for every 4096 bytes(can be up to 8k) */
 401                 size += urb->transfer_buffer_length / 4096;
 402                 /* ...add for any remaining bytes... */
 403                 if ((urb->transfer_buffer_length % 4096) != 0)
 404                         size++;
 405                 /* ..and maybe a zero length packet to wrap it up */
 406                 if (size == 0)
 407                         size++;
 408                 else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
 409                          && (urb->transfer_buffer_length
 410                              % usb_maxpacket(urb->dev, pipe,
 411                                              usb_pipeout(pipe))) != 0)
 412                         size++;
 413                 break;
 414         case PIPE_ISOCHRONOUS:
 415                 size = urb->number_of_packets;
 416                 if (size <= 0)
 417                         return -EINVAL;
 418                 for (i = 0; i < urb->number_of_packets; i++) {
 419                         urb->iso_frame_desc[i].actual_length = 0;
 420                         urb->iso_frame_desc[i].status = (u32) (-EXDEV);
 421                 }
 422                 break;
 423         case PIPE_INTERRUPT:
 424                 size = 1;
 425         }
 426
 427         /* allocate the private part of the URB */
 428         urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
 429         if (!urb_priv)
 430                 return -ENOMEM;
 431
 432         /* allocate the private part of the URB */
 433         urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
 434         if (!urb_priv->tds) {
 435                 kfree(urb_priv);
 436                 return -ENOMEM;
 437         }
 438
 439         spin_lock_irqsave(&fhci->lock, flags);
 440
 441         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 442         if (ret)
 443                 goto err;
 444
 445         /* fill the private part of the URB */
 446         urb_priv->num_of_tds = size;
 447
 448         urb->status = -EINPROGRESS;
 449         urb->actual_length = 0;
 450         urb->error_count = 0;
 451         urb->hcpriv = urb_priv;
 452
 453         fhci_queue_urb(fhci, urb);
 454 err:
 455         if (ret) {
 456                 kfree(urb_priv->tds);
 457                 kfree(urb_priv);
 458         }
 459         spin_unlock_irqrestore(&fhci->lock, flags);
 460         return ret;
 461 }
 462
 463 /* dequeue FHCI URB */
 464 static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 465 {
 466         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 467         struct fhci_usb *usb = fhci->usb_lld;
 468         int ret = -EINVAL;
 469         unsigned long flags;
 470
 471         if (!urb || !urb->dev || !urb->dev->bus)
 472                 goto out;
 473
 474         spin_lock_irqsave(&fhci->lock, flags);
 475
 476         ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 477         if (ret)
 478                 goto out2;
 479
 480         if (usb->port_status != FHCI_PORT_DISABLED) {
 481                 struct urb_priv *urb_priv;
 482
 483                 /*
 484                  * flag the urb's data for deletion in some upcoming
 485                  * SF interrupt's delete list processing
 486                  */
 487                 urb_priv = urb->hcpriv;
 488
 489                 if (!urb_priv || (urb_priv->state == URB_DEL))
 490                         goto out2;
 491
 492                 urb_priv->state = URB_DEL;
 493
 494                 /* already pending? */
 495                 urb_priv->ed->state = FHCI_ED_URB_DEL;
 496         } else {
 497                 fhci_urb_complete_free(fhci, urb);
 498         }
 499
 500 out2:
 501         spin_unlock_irqrestore(&fhci->lock, flags);
 502 out:
 503         return ret;
 504 }
 505
 506 static void fhci_endpoint_disable(struct usb_hcd *hcd,
 507                                   struct usb_host_endpoint *ep)
 508 {
 509         struct fhci_hcd *fhci;
 510         struct ed *ed;
 511         unsigned long flags;
 512
 513         fhci = hcd_to_fhci(hcd);
 514         spin_lock_irqsave(&fhci->lock, flags);
 515         ed = ep->hcpriv;
 516         if (ed) {
 517                 while (ed->td_head != NULL) {
 518                         struct td *td = fhci_remove_td_from_ed(ed);
 519                         fhci_urb_complete_free(fhci, td->urb);
 520                 }
 521                 fhci_recycle_empty_ed(fhci, ed);
 522                 ep->hcpriv = NULL;
 523         }
 524         spin_unlock_irqrestore(&fhci->lock, flags);
 525 }
 526
 527 static int fhci_get_frame_number(struct usb_hcd *hcd)
 528 {
 529         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 530
 531         return get_frame_num(fhci);
 532 }
 533
 534 static const struct hc_driver fhci_driver = {
 535         .description = "fsl,usb-fhci",
 536         .product_desc = "FHCI HOST Controller",
 537         .hcd_priv_size = sizeof(struct fhci_hcd),
 538
 539         /* generic hardware linkage */
 540         .irq = fhci_irq,
 541         .flags = HCD_DMA | HCD_USB11 | HCD_MEMORY,
 542
 543         /* basic lifecycle operation */
 544         .start = fhci_start,
 545         .stop = fhci_stop,
 546
 547         /* managing i/o requests and associated device resources */
 548         .urb_enqueue = fhci_urb_enqueue,
 549         .urb_dequeue = fhci_urb_dequeue,
 550         .endpoint_disable = fhci_endpoint_disable,
 551
 552         /* scheduling support */
 553         .get_frame_number = fhci_get_frame_number,
 554
 555         /* root hub support */
 556         .hub_status_data = fhci_hub_status_data,
 557         .hub_control = fhci_hub_control,
 558 };
 559
 560 static int of_fhci_probe(struct platform_device *ofdev)
 561 {
 562         struct device *dev = &ofdev->dev;
 563         struct device_node *node = dev->of_node;
 564         struct usb_hcd *hcd;
 565         struct fhci_hcd *fhci;
 566         struct resource usb_regs;
 567         unsigned long pram_addr;
 568         unsigned int usb_irq;
 569         const char *sprop;
 570         const u32 *iprop;
 571         int size;
 572         int ret;
 573         int i;
 574         int j;
 575
 576         if (usb_disabled())
 577                 return -ENODEV;
 578
 579         sprop = of_get_property(node, "mode", NULL);
 580         if (sprop && strcmp(sprop, "host"))
 581                 return -ENODEV;
 582
 583         hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
 584         if (!hcd) {
 585                 dev_err(dev, "could not create hcd\n");
 586                 return -ENOMEM;
 587         }
 588
 589         fhci = hcd_to_fhci(hcd);
 590         hcd->self.controller = dev;
 591         dev_set_drvdata(dev, hcd);
 592
 593         iprop = of_get_property(node, "hub-power-budget", &size);
 594         if (iprop && size == sizeof(*iprop))
 595                 hcd->power_budget = *iprop;
 596
 597         /* FHCI registers. */
 598         ret = of_address_to_resource(node, 0, &usb_regs);
 599         if (ret) {
 600                 dev_err(dev, "could not get regs\n");
 601                 goto err_regs;
 602         }
 603
 604         hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
 605         if (!hcd->regs) {
 606                 dev_err(dev, "could not ioremap regs\n");
 607                 ret = -ENOMEM;
 608                 goto err_regs;
 609         }
 610         fhci->regs = hcd->regs;
 611
 612         /* Parameter RAM. */
 613         iprop = of_get_property(node, "reg", &size);
 614         if (!iprop || size < sizeof(*iprop) * 4) {
 615                 dev_err(dev, "can't get pram offset\n");
 616                 ret = -EINVAL;
 617                 goto err_pram;
 618         }
 619
 620         pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
 621         if (IS_ERR_VALUE(pram_addr)) {
 622                 dev_err(dev, "failed to allocate usb pram\n");
 623                 ret = -ENOMEM;
 624                 goto err_pram;
 625         }
 626
 627         qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
 628                      QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
 629         fhci->pram = cpm_muram_addr(pram_addr);
 630
 631         /* GPIOs and pins */
 632         for (i = 0; i < NUM_GPIOS; i++) {
 633                 int gpio;
 634                 enum of_gpio_flags flags;
 635
 636                 gpio = of_get_gpio_flags(node, i, &flags);
 637                 fhci->gpios[i] = gpio;
 638                 fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
 639
 640                 if (!gpio_is_valid(gpio)) {
 641                         if (i < GPIO_SPEED) {
 642                                 dev_err(dev, "incorrect GPIO%d: %d\n",
 643                                         i, gpio);
 644                                 goto err_gpios;
 645                         } else {
 646                                 dev_info(dev, "assuming board doesn't have "
 647                                         "%s gpio\n", i == GPIO_SPEED ?
 648                                         "speed" : "power");
 649                                 continue;
 650                         }
 651                 }
 652
 653                 ret = gpio_request(gpio, dev_name(dev));
 654                 if (ret) {
 655                         dev_err(dev, "failed to request gpio %d", i);
 656                         goto err_gpios;
 657                 }
 658
 659                 if (i >= GPIO_SPEED) {
 660                         ret = gpio_direction_output(gpio, 0);
 661                         if (ret) {
 662                                 dev_err(dev, "failed to set gpio %d as "
 663                                         "an output\n", i);
 664                                 i++;
 665                                 goto err_gpios;
 666                         }
 667                 }
 668         }
 669
 670         for (j = 0; j < NUM_PINS; j++) {
 671                 fhci->pins[j] = qe_pin_request(node, j);
 672                 if (IS_ERR(fhci->pins[j])) {
 673                         ret = PTR_ERR(fhci->pins[j]);
 674                         dev_err(dev, "can't get pin %d: %d\n", j, ret);
 675                         goto err_pins;
 676                 }
 677         }
 678
 679         /* Frame limit timer and its interrupt. */
 680         fhci->timer = gtm_get_timer16();
 681         if (IS_ERR(fhci->timer)) {
 682                 ret = PTR_ERR(fhci->timer);
 683                 dev_err(dev, "failed to request qe timer: %i", ret);
 684                 goto err_get_timer;
 685         }
 686
 687         ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
 688                           0, "qe timer (usb)", hcd);
 689         if (ret) {
 690                 dev_err(dev, "failed to request timer irq");
 691                 goto err_timer_irq;
 692         }
 693
 694         /* USB Host interrupt. */
 695         usb_irq = irq_of_parse_and_map(node, 0);
 696         if (usb_irq == NO_IRQ) {
 697                 dev_err(dev, "could not get usb irq\n");
 698                 ret = -EINVAL;
 699                 goto err_usb_irq;
 700         }
 701
 702         /* Clocks. */
 703         sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
 704         if (sprop) {
 705                 fhci->fullspeed_clk = qe_clock_source(sprop);
 706                 if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
 707                         dev_err(dev, "wrong fullspeed-clock\n");
 708                         ret = -EINVAL;
 709                         goto err_clocks;
 710                 }
 711         }
 712
 713         sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
 714         if (sprop) {
 715                 fhci->lowspeed_clk = qe_clock_source(sprop);
 716                 if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
 717                         dev_err(dev, "wrong lowspeed-clock\n");
 718                         ret = -EINVAL;
 719                         goto err_clocks;
 720                 }
 721         }
 722
 723         if (fhci->fullspeed_clk == QE_CLK_NONE &&
 724                         fhci->lowspeed_clk == QE_CLK_NONE) {
 725                 dev_err(dev, "no clocks specified\n");
 726                 ret = -EINVAL;
 727                 goto err_clocks;
 728         }
 729
 730         dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
 731
 732         fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
 733
 734         /* Start with full-speed, if possible. */
 735         if (fhci->fullspeed_clk != QE_CLK_NONE) {
 736                 fhci_config_transceiver(fhci, FHCI_PORT_FULL);
 737                 qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
 738         } else {
 739                 fhci_config_transceiver(fhci, FHCI_PORT_LOW);
 740                 qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
 741         }
 742
 743         /* Clear and disable any pending interrupts. */
 744         out_be16(&fhci->regs->usb_usber, 0xffff);
 745         out_be16(&fhci->regs->usb_usbmr, 0);
 746
 747         ret = usb_add_hcd(hcd, usb_irq, 0);
 748         if (ret < 0)
 749                 goto err_add_hcd;
 750
 751         device_wakeup_enable(hcd->self.controller);
 752
 753         fhci_dfs_create(fhci);
 754
 755         return 0;
 756
 757 err_add_hcd:
 758 err_clocks:
 759         irq_dispose_mapping(usb_irq);
 760 err_usb_irq:
 761         free_irq(fhci->timer->irq, hcd);
 762 err_timer_irq:
 763         gtm_put_timer16(fhci->timer);
 764 err_get_timer:
 765 err_pins:
 766         while (--j >= 0)
 767                 qe_pin_free(fhci->pins[j]);
 768 err_gpios:
 769         while (--i >= 0) {
 770                 if (gpio_is_valid(fhci->gpios[i]))
 771                         gpio_free(fhci->gpios[i]);
 772         }
 773         cpm_muram_free(pram_addr);
 774 err_pram:
 775         iounmap(hcd->regs);
 776 err_regs:
 777         usb_put_hcd(hcd);
 778         return ret;
 779 }
 780
 781 static int fhci_remove(struct device *dev)
 782 {
 783         struct usb_hcd *hcd = dev_get_drvdata(dev);
 784         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 785         int i;
 786         int j;
 787
 788         usb_remove_hcd(hcd);
 789         free_irq(fhci->timer->irq, hcd);
 790         gtm_put_timer16(fhci->timer);
 791         cpm_muram_free(cpm_muram_offset(fhci->pram));
 792         for (i = 0; i < NUM_GPIOS; i++) {
 793                 if (!gpio_is_valid(fhci->gpios[i]))
 794                         continue;
 795                 gpio_free(fhci->gpios[i]);
 796         }
 797         for (j = 0; j < NUM_PINS; j++)
 798                 qe_pin_free(fhci->pins[j]);
 799         fhci_dfs_destroy(fhci);
 800         usb_put_hcd(hcd);
 801         return 0;
 802 }
 803
 804 static int of_fhci_remove(struct platform_device *ofdev)
 805 {
 806         return fhci_remove(&ofdev->dev);
 807 }
 808
 809 static const struct of_device_id of_fhci_match[] = {
 810         { .compatible = "fsl,mpc8323-qe-usb", },
 811         {},
 812 };
 813 MODULE_DEVICE_TABLE(of, of_fhci_match);
 814
 815 static struct platform_driver of_fhci_driver = {
 816         .driver = {
 817                 .name = "fsl,usb-fhci",
 818                 .of_match_table = of_fhci_match,
 819         },
 820         .probe          = of_fhci_probe,
 821         .remove         = of_fhci_remove,
 822 };
 823
 824 module_platform_driver(of_fhci_driver);
 825
 826 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
 827 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
 828               "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
 829               "Anton Vorontsov <avorontsov@ru.mvista.com>");
 830 MODULE_LICENSE("GPL");