drivers/usb/host/fhci-hcd.c

   1 /*
   2  * Freescale QUICC Engine USB Host Controller Driver
   3  *
   4  * Copyright (c) Freescale Semicondutor, Inc. 2006.
   5  *               Shlomi Gridish <gridish@freescale.com>
   6  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   7  * Copyright (c) Logic Product Development, Inc. 2007
   8  *               Peter Barada <peterb@logicpd.com>
   9  * Copyright (c) MontaVista Software, Inc. 2008.
  10  *               Anton Vorontsov <avorontsov@ru.mvista.com>
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/kernel.h>
  22 #include <linux/delay.h>
  23 #include <linux/errno.h>
  24 #include <linux/list.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/io.h>
  27 #include <linux/usb.h>
  28 #include <linux/usb/hcd.h>
  29 #include <linux/of_platform.h>
  30 #include <linux/of_gpio.h>
  31 #include <linux/slab.h>
  32 #include <asm/qe.h>
  33 #include <asm/fsl_gtm.h>
  34 #include "fhci.h"
  35
  36 void fhci_start_sof_timer(struct fhci_hcd *fhci)
  37 {
  38         fhci_dbg(fhci, "-> %s\n", __func__);
  39
  40         /* clear frame_n */
  41         out_be16(&fhci->pram->frame_num, 0);
  42
  43         out_be16(&fhci->regs->usb_sof_tmr, 0);
  44         setbits8(&fhci->regs->usb_mod, USB_MODE_SFTE);
  45
  46         fhci_dbg(fhci, "<- %s\n", __func__);
  47 }
  48
  49 void fhci_stop_sof_timer(struct fhci_hcd *fhci)
  50 {
  51         fhci_dbg(fhci, "-> %s\n", __func__);
  52
  53         clrbits8(&fhci->regs->usb_mod, USB_MODE_SFTE);
  54         gtm_stop_timer16(fhci->timer);
  55
  56         fhci_dbg(fhci, "<- %s\n", __func__);
  57 }
  58
  59 u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
  60 {
  61         return be16_to_cpu(in_be16(&usb->fhci->regs->usb_sof_tmr) / 12);
  62 }
  63
  64 /* initialize the endpoint zero */
  65 static u32 endpoint_zero_init(struct fhci_usb *usb,
  66                               enum fhci_mem_alloc data_mem,
  67                               u32 ring_len)
  68 {
  69         u32 rc;
  70
  71         rc = fhci_create_ep(usb, data_mem, ring_len);
  72         if (rc)
  73                 return rc;
  74
  75         /* inilialize endpoint registers */
  76         fhci_init_ep_registers(usb, usb->ep0, data_mem);
  77
  78         return 0;
  79 }
  80
  81 /* enable the USB interrupts */
  82 void fhci_usb_enable_interrupt(struct fhci_usb *usb)
  83 {
  84         struct fhci_hcd *fhci = usb->fhci;
  85
  86         if (usb->intr_nesting_cnt == 1) {
  87                 /* initialize the USB interrupt */
  88                 enable_irq(fhci_to_hcd(fhci)->irq);
  89
  90                 /* initialize the event register and mask register */
  91                 out_be16(&usb->fhci->regs->usb_event, 0xffff);
  92                 out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
  93
  94                 /* enable the timer interrupts */
  95                 enable_irq(fhci->timer->irq);
  96         } else if (usb->intr_nesting_cnt > 1)
  97                 fhci_info(fhci, "unbalanced USB interrupts nesting\n");
  98         usb->intr_nesting_cnt--;
  99 }
 100
 101 /* disable the usb interrupt */
 102 void fhci_usb_disable_interrupt(struct fhci_usb *usb)
 103 {
 104         struct fhci_hcd *fhci = usb->fhci;
 105
 106         if (usb->intr_nesting_cnt == 0) {
 107                 /* disable the timer interrupt */
 108                 disable_irq_nosync(fhci->timer->irq);
 109
 110                 /* disable the usb interrupt */
 111                 disable_irq_nosync(fhci_to_hcd(fhci)->irq);
 112                 out_be16(&usb->fhci->regs->usb_mask, 0);
 113         }
 114         usb->intr_nesting_cnt++;
 115 }
 116
 117 /* enable the USB controller */
 118 static u32 fhci_usb_enable(struct fhci_hcd *fhci)
 119 {
 120         struct fhci_usb *usb = fhci->usb_lld;
 121
 122         out_be16(&usb->fhci->regs->usb_event, 0xffff);
 123         out_be16(&usb->fhci->regs->usb_mask, usb->saved_msk);
 124         setbits8(&usb->fhci->regs->usb_mod, USB_MODE_EN);
 125
 126         mdelay(100);
 127
 128         return 0;
 129 }
 130
 131 /* disable the USB controller */
 132 static u32 fhci_usb_disable(struct fhci_hcd *fhci)
 133 {
 134         struct fhci_usb *usb = fhci->usb_lld;
 135
 136         fhci_usb_disable_interrupt(usb);
 137         fhci_port_disable(fhci);
 138
 139         /* disable the usb controller */
 140         if (usb->port_status == FHCI_PORT_FULL ||
 141                         usb->port_status == FHCI_PORT_LOW)
 142                 fhci_device_disconnected_interrupt(fhci);
 143
 144         clrbits8(&usb->fhci->regs->usb_mod, USB_MODE_EN);
 145
 146         return 0;
 147 }
 148
 149 /* check the bus state by polling the QE bit on the IO ports */
 150 int fhci_ioports_check_bus_state(struct fhci_hcd *fhci)
 151 {
 152         u8 bits = 0;
 153
 154         /* check USBOE,if transmitting,exit */
 155         if (!gpio_get_value(fhci->gpios[GPIO_USBOE]))
 156                 return -1;
 157
 158         /* check USBRP */
 159         if (gpio_get_value(fhci->gpios[GPIO_USBRP]))
 160                 bits |= 0x2;
 161
 162         /* check USBRN */
 163         if (gpio_get_value(fhci->gpios[GPIO_USBRN]))
 164                 bits |= 0x1;
 165
 166         return bits;
 167 }
 168
 169 static void fhci_mem_free(struct fhci_hcd *fhci)
 170 {
 171         struct ed *ed;
 172         struct ed *next_ed;
 173         struct td *td;
 174         struct td *next_td;
 175
 176         list_for_each_entry_safe(ed, next_ed, &fhci->empty_eds, node) {
 177                 list_del(&ed->node);
 178                 kfree(ed);
 179         }
 180
 181         list_for_each_entry_safe(td, next_td, &fhci->empty_tds, node) {
 182                 list_del(&td->node);
 183                 kfree(td);
 184         }
 185
 186         kfree(fhci->vroot_hub);
 187         fhci->vroot_hub = NULL;
 188
 189         kfree(fhci->hc_list);
 190         fhci->hc_list = NULL;
 191 }
 192
 193 static int fhci_mem_init(struct fhci_hcd *fhci)
 194 {
 195         int i;
 196
 197         fhci->hc_list = kzalloc(sizeof(*fhci->hc_list), GFP_KERNEL);
 198         if (!fhci->hc_list)
 199                 goto err;
 200
 201         INIT_LIST_HEAD(&fhci->hc_list->ctrl_list);
 202         INIT_LIST_HEAD(&fhci->hc_list->bulk_list);
 203         INIT_LIST_HEAD(&fhci->hc_list->iso_list);
 204         INIT_LIST_HEAD(&fhci->hc_list->intr_list);
 205         INIT_LIST_HEAD(&fhci->hc_list->done_list);
 206
 207         fhci->vroot_hub = kzalloc(sizeof(*fhci->vroot_hub), GFP_KERNEL);
 208         if (!fhci->vroot_hub)
 209                 goto err;
 210
 211         INIT_LIST_HEAD(&fhci->empty_eds);
 212         INIT_LIST_HEAD(&fhci->empty_tds);
 213
 214         /* initialize work queue to handle done list */
 215         fhci_tasklet.data = (unsigned long)fhci;
 216         fhci->process_done_task = &fhci_tasklet;
 217
 218         for (i = 0; i < MAX_TDS; i++) {
 219                 struct td *td;
 220
 221                 td = kmalloc(sizeof(*td), GFP_KERNEL);
 222                 if (!td)
 223                         goto err;
 224                 fhci_recycle_empty_td(fhci, td);
 225         }
 226         for (i = 0; i < MAX_EDS; i++) {
 227                 struct ed *ed;
 228
 229                 ed = kmalloc(sizeof(*ed), GFP_KERNEL);
 230                 if (!ed)
 231                         goto err;
 232                 fhci_recycle_empty_ed(fhci, ed);
 233         }
 234
 235         fhci->active_urbs = 0;
 236         return 0;
 237 err:
 238         fhci_mem_free(fhci);
 239         return -ENOMEM;
 240 }
 241
 242 /* destroy the fhci_usb structure */
 243 static void fhci_usb_free(void *lld)
 244 {
 245         struct fhci_usb *usb = lld;
 246         struct fhci_hcd *fhci;
 247
 248         if (usb) {
 249                 fhci = usb->fhci;
 250                 fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
 251                 fhci_ep0_free(usb);
 252                 kfree(usb->actual_frame);
 253                 kfree(usb);
 254         }
 255 }
 256
 257 /* initialize the USB */
 258 static int fhci_usb_init(struct fhci_hcd *fhci)
 259 {
 260         struct fhci_usb *usb = fhci->usb_lld;
 261
 262         memset_io(usb->fhci->pram, 0, FHCI_PRAM_SIZE);
 263
 264         usb->port_status = FHCI_PORT_DISABLED;
 265         usb->max_frame_usage = FRAME_TIME_USAGE;
 266         usb->sw_transaction_time = SW_FIX_TIME_BETWEEN_TRANSACTION;
 267
 268         usb->actual_frame = kzalloc(sizeof(*usb->actual_frame), GFP_KERNEL);
 269         if (!usb->actual_frame) {
 270                 fhci_usb_free(usb);
 271                 return -ENOMEM;
 272         }
 273
 274         INIT_LIST_HEAD(&usb->actual_frame->tds_list);
 275
 276         /* initializing registers on chip, clear frame number */
 277         out_be16(&fhci->pram->frame_num, 0);
 278
 279         /* clear rx state */
 280         out_be32(&fhci->pram->rx_state, 0);
 281
 282         /* set mask register */
 283         usb->saved_msk = (USB_E_TXB_MASK |
 284                           USB_E_TXE1_MASK |
 285                           USB_E_IDLE_MASK |
 286                           USB_E_RESET_MASK | USB_E_SFT_MASK | USB_E_MSF_MASK);
 287
 288         out_8(&usb->fhci->regs->usb_mod, USB_MODE_HOST | USB_MODE_EN);
 289
 290         /* clearing the mask register */
 291         out_be16(&usb->fhci->regs->usb_mask, 0);
 292
 293         /* initialing the event register */
 294         out_be16(&usb->fhci->regs->usb_event, 0xffff);
 295
 296         if (endpoint_zero_init(usb, DEFAULT_DATA_MEM, DEFAULT_RING_LEN) != 0) {
 297                 fhci_usb_free(usb);
 298                 return -EINVAL;
 299         }
 300
 301         return 0;
 302 }
 303
 304 /* initialize the fhci_usb struct and the corresponding data staruct */
 305 static struct fhci_usb *fhci_create_lld(struct fhci_hcd *fhci)
 306 {
 307         struct fhci_usb *usb;
 308
 309         /* allocate memory for SCC data structure */
 310         usb = kzalloc(sizeof(*usb), GFP_KERNEL);
 311         if (!usb) {
 312                 fhci_err(fhci, "no memory for SCC data struct\n");
 313                 return NULL;
 314         }
 315
 316         usb->fhci = fhci;
 317         usb->hc_list = fhci->hc_list;
 318         usb->vroot_hub = fhci->vroot_hub;
 319
 320         usb->transfer_confirm = fhci_transfer_confirm_callback;
 321
 322         return usb;
 323 }
 324
 325 static int fhci_start(struct usb_hcd *hcd)
 326 {
 327         int ret;
 328         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 329
 330         ret = fhci_mem_init(fhci);
 331         if (ret) {
 332                 fhci_err(fhci, "failed to allocate memory\n");
 333                 goto err;
 334         }
 335
 336         fhci->usb_lld = fhci_create_lld(fhci);
 337         if (!fhci->usb_lld) {
 338                 fhci_err(fhci, "low level driver config failed\n");
 339                 ret = -ENOMEM;
 340                 goto err;
 341         }
 342
 343         ret = fhci_usb_init(fhci);
 344         if (ret) {
 345                 fhci_err(fhci, "low level driver initialize failed\n");
 346                 goto err;
 347         }
 348
 349         spin_lock_init(&fhci->lock);
 350
 351         /* connect the virtual root hub */
 352         fhci->vroot_hub->dev_num = 1;   /* this field may be needed to fix */
 353         fhci->vroot_hub->hub.wHubStatus = 0;
 354         fhci->vroot_hub->hub.wHubChange = 0;
 355         fhci->vroot_hub->port.wPortStatus = 0;
 356         fhci->vroot_hub->port.wPortChange = 0;
 357
 358         hcd->state = HC_STATE_RUNNING;
 359
 360         /*
 361          * From here on, khubd concurrently accesses the root
 362          * hub; drivers will be talking to enumerated devices.
 363          * (On restart paths, khubd already knows about the root
 364          * hub and could find work as soon as we wrote FLAG_CF.)
 365          *
 366          * Before this point the HC was idle/ready.  After, khubd
 367          * and device drivers may start it running.
 368          */
 369         fhci_usb_enable(fhci);
 370         return 0;
 371 err:
 372         fhci_mem_free(fhci);
 373         return ret;
 374 }
 375
 376 static void fhci_stop(struct usb_hcd *hcd)
 377 {
 378         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 379
 380         fhci_usb_disable_interrupt(fhci->usb_lld);
 381         fhci_usb_disable(fhci);
 382
 383         fhci_usb_free(fhci->usb_lld);
 384         fhci->usb_lld = NULL;
 385         fhci_mem_free(fhci);
 386 }
 387
 388 static int fhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 389                             gfp_t mem_flags)
 390 {
 391         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 392         u32 pipe = urb->pipe;
 393         int ret;
 394         int i;
 395         int size = 0;
 396         struct urb_priv *urb_priv;
 397         unsigned long flags;
 398
 399         switch (usb_pipetype(pipe)) {
 400         case PIPE_CONTROL:
 401                 /* 1 td fro setup,1 for ack */
 402                 size = 2;
 403         case PIPE_BULK:
 404                 /* one td for every 4096 bytes(can be up to 8k) */
 405                 size += urb->transfer_buffer_length / 4096;
 406                 /* ...add for any remaining bytes... */
 407                 if ((urb->transfer_buffer_length % 4096) != 0)
 408                         size++;
 409                 /* ..and maybe a zero length packet to wrap it up */
 410                 if (size == 0)
 411                         size++;
 412                 else if ((urb->transfer_flags & URB_ZERO_PACKET) != 0
 413                          && (urb->transfer_buffer_length
 414                              % usb_maxpacket(urb->dev, pipe,
 415                                              usb_pipeout(pipe))) != 0)
 416                         size++;
 417                 break;
 418         case PIPE_ISOCHRONOUS:
 419                 size = urb->number_of_packets;
 420                 if (size <= 0)
 421                         return -EINVAL;
 422                 for (i = 0; i < urb->number_of_packets; i++) {
 423                         urb->iso_frame_desc[i].actual_length = 0;
 424                         urb->iso_frame_desc[i].status = (u32) (-EXDEV);
 425                 }
 426                 break;
 427         case PIPE_INTERRUPT:
 428                 size = 1;
 429         }
 430
 431         /* allocate the private part of the URB */
 432         urb_priv = kzalloc(sizeof(*urb_priv), mem_flags);
 433         if (!urb_priv)
 434                 return -ENOMEM;
 435
 436         /* allocate the private part of the URB */
 437         urb_priv->tds = kcalloc(size, sizeof(*urb_priv->tds), mem_flags);
 438         if (!urb_priv->tds) {
 439                 kfree(urb_priv);
 440                 return -ENOMEM;
 441         }
 442
 443         spin_lock_irqsave(&fhci->lock, flags);
 444
 445         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 446         if (ret)
 447                 goto err;
 448
 449         /* fill the private part of the URB */
 450         urb_priv->num_of_tds = size;
 451
 452         urb->status = -EINPROGRESS;
 453         urb->actual_length = 0;
 454         urb->error_count = 0;
 455         urb->hcpriv = urb_priv;
 456
 457         fhci_queue_urb(fhci, urb);
 458 err:
 459         if (ret) {
 460                 kfree(urb_priv->tds);
 461                 kfree(urb_priv);
 462         }
 463         spin_unlock_irqrestore(&fhci->lock, flags);
 464         return ret;
 465 }
 466
 467 /* dequeue FHCI URB */
 468 static int fhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 469 {
 470         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 471         struct fhci_usb *usb = fhci->usb_lld;
 472         int ret = -EINVAL;
 473         unsigned long flags;
 474
 475         if (!urb || !urb->dev || !urb->dev->bus)
 476                 goto out;
 477
 478         spin_lock_irqsave(&fhci->lock, flags);
 479
 480         ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 481         if (ret)
 482                 goto out2;
 483
 484         if (usb->port_status != FHCI_PORT_DISABLED) {
 485                 struct urb_priv *urb_priv;
 486
 487                 /*
 488                  * flag the urb's data for deletion in some upcoming
 489                  * SF interrupt's delete list processing
 490                  */
 491                 urb_priv = urb->hcpriv;
 492
 493                 if (!urb_priv || (urb_priv->state == URB_DEL))
 494                         goto out2;
 495
 496                 urb_priv->state = URB_DEL;
 497
 498                 /* already pending? */
 499                 urb_priv->ed->state = FHCI_ED_URB_DEL;
 500         } else {
 501                 fhci_urb_complete_free(fhci, urb);
 502         }
 503
 504 out2:
 505         spin_unlock_irqrestore(&fhci->lock, flags);
 506 out:
 507         return ret;
 508 }
 509
 510 static void fhci_endpoint_disable(struct usb_hcd *hcd,
 511                                   struct usb_host_endpoint *ep)
 512 {
 513         struct fhci_hcd *fhci;
 514         struct ed *ed;
 515         unsigned long flags;
 516
 517         fhci = hcd_to_fhci(hcd);
 518         spin_lock_irqsave(&fhci->lock, flags);
 519         ed = ep->hcpriv;
 520         if (ed) {
 521                 while (ed->td_head != NULL) {
 522                         struct td *td = fhci_remove_td_from_ed(ed);
 523                         fhci_urb_complete_free(fhci, td->urb);
 524                 }
 525                 fhci_recycle_empty_ed(fhci, ed);
 526                 ep->hcpriv = NULL;
 527         }
 528         spin_unlock_irqrestore(&fhci->lock, flags);
 529 }
 530
 531 static int fhci_get_frame_number(struct usb_hcd *hcd)
 532 {
 533         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 534
 535         return get_frame_num(fhci);
 536 }
 537
 538 static const struct hc_driver fhci_driver = {
 539         .description = "fsl,usb-fhci",
 540         .product_desc = "FHCI HOST Controller",
 541         .hcd_priv_size = sizeof(struct fhci_hcd),
 542
 543         /* generic hardware linkage */
 544         .irq = fhci_irq,
 545         .flags = HCD_USB11 | HCD_MEMORY,
 546
 547         /* basic lifecycle operation */
 548         .start = fhci_start,
 549         .stop = fhci_stop,
 550
 551         /* managing i/o requests and associated device resources */
 552         .urb_enqueue = fhci_urb_enqueue,
 553         .urb_dequeue = fhci_urb_dequeue,
 554         .endpoint_disable = fhci_endpoint_disable,
 555
 556         /* scheduling support */
 557         .get_frame_number = fhci_get_frame_number,
 558
 559         /* root hub support */
 560         .hub_status_data = fhci_hub_status_data,
 561         .hub_control = fhci_hub_control,
 562 };
 563
 564 static int __devinit of_fhci_probe(struct platform_device *ofdev)
 565 {
 566         struct device *dev = &ofdev->dev;
 567         struct device_node *node = dev->of_node;
 568         struct usb_hcd *hcd;
 569         struct fhci_hcd *fhci;
 570         struct resource usb_regs;
 571         unsigned long pram_addr;
 572         unsigned int usb_irq;
 573         const char *sprop;
 574         const u32 *iprop;
 575         int size;
 576         int ret;
 577         int i;
 578         int j;
 579
 580         if (usb_disabled())
 581                 return -ENODEV;
 582
 583         sprop = of_get_property(node, "mode", NULL);
 584         if (sprop && strcmp(sprop, "host"))
 585                 return -ENODEV;
 586
 587         hcd = usb_create_hcd(&fhci_driver, dev, dev_name(dev));
 588         if (!hcd) {
 589                 dev_err(dev, "could not create hcd\n");
 590                 return -ENOMEM;
 591         }
 592
 593         fhci = hcd_to_fhci(hcd);
 594         hcd->self.controller = dev;
 595         dev_set_drvdata(dev, hcd);
 596
 597         iprop = of_get_property(node, "hub-power-budget", &size);
 598         if (iprop && size == sizeof(*iprop))
 599                 hcd->power_budget = *iprop;
 600
 601         /* FHCI registers. */
 602         ret = of_address_to_resource(node, 0, &usb_regs);
 603         if (ret) {
 604                 dev_err(dev, "could not get regs\n");
 605                 goto err_regs;
 606         }
 607
 608         hcd->regs = ioremap(usb_regs.start, resource_size(&usb_regs));
 609         if (!hcd->regs) {
 610                 dev_err(dev, "could not ioremap regs\n");
 611                 ret = -ENOMEM;
 612                 goto err_regs;
 613         }
 614         fhci->regs = hcd->regs;
 615
 616         /* Parameter RAM. */
 617         iprop = of_get_property(node, "reg", &size);
 618         if (!iprop || size < sizeof(*iprop) * 4) {
 619                 dev_err(dev, "can't get pram offset\n");
 620                 ret = -EINVAL;
 621                 goto err_pram;
 622         }
 623
 624         pram_addr = cpm_muram_alloc(FHCI_PRAM_SIZE, 64);
 625         if (IS_ERR_VALUE(pram_addr)) {
 626                 dev_err(dev, "failed to allocate usb pram\n");
 627                 ret = -ENOMEM;
 628                 goto err_pram;
 629         }
 630
 631         qe_issue_cmd(QE_ASSIGN_PAGE_TO_DEVICE, QE_CR_SUBBLOCK_USB,
 632                      QE_CR_PROTOCOL_UNSPECIFIED, pram_addr);
 633         fhci->pram = cpm_muram_addr(pram_addr);
 634
 635         /* GPIOs and pins */
 636         for (i = 0; i < NUM_GPIOS; i++) {
 637                 int gpio;
 638                 enum of_gpio_flags flags;
 639
 640                 gpio = of_get_gpio_flags(node, i, &flags);
 641                 fhci->gpios[i] = gpio;
 642                 fhci->alow_gpios[i] = flags & OF_GPIO_ACTIVE_LOW;
 643
 644                 if (!gpio_is_valid(gpio)) {
 645                         if (i < GPIO_SPEED) {
 646                                 dev_err(dev, "incorrect GPIO%d: %d\n",
 647                                         i, gpio);
 648                                 goto err_gpios;
 649                         } else {
 650                                 dev_info(dev, "assuming board doesn't have "
 651                                         "%s gpio\n", i == GPIO_SPEED ?
 652                                         "speed" : "power");
 653                                 continue;
 654                         }
 655                 }
 656
 657                 ret = gpio_request(gpio, dev_name(dev));
 658                 if (ret) {
 659                         dev_err(dev, "failed to request gpio %d", i);
 660                         goto err_gpios;
 661                 }
 662
 663                 if (i >= GPIO_SPEED) {
 664                         ret = gpio_direction_output(gpio, 0);
 665                         if (ret) {
 666                                 dev_err(dev, "failed to set gpio %d as "
 667                                         "an output\n", i);
 668                                 i++;
 669                                 goto err_gpios;
 670                         }
 671                 }
 672         }
 673
 674         for (j = 0; j < NUM_PINS; j++) {
 675                 fhci->pins[j] = qe_pin_request(node, j);
 676                 if (IS_ERR(fhci->pins[j])) {
 677                         ret = PTR_ERR(fhci->pins[j]);
 678                         dev_err(dev, "can't get pin %d: %d\n", j, ret);
 679                         goto err_pins;
 680                 }
 681         }
 682
 683         /* Frame limit timer and its interrupt. */
 684         fhci->timer = gtm_get_timer16();
 685         if (IS_ERR(fhci->timer)) {
 686                 ret = PTR_ERR(fhci->timer);
 687                 dev_err(dev, "failed to request qe timer: %i", ret);
 688                 goto err_get_timer;
 689         }
 690
 691         ret = request_irq(fhci->timer->irq, fhci_frame_limit_timer_irq,
 692                           0, "qe timer (usb)", hcd);
 693         if (ret) {
 694                 dev_err(dev, "failed to request timer irq");
 695                 goto err_timer_irq;
 696         }
 697
 698         /* USB Host interrupt. */
 699         usb_irq = irq_of_parse_and_map(node, 0);
 700         if (usb_irq == NO_IRQ) {
 701                 dev_err(dev, "could not get usb irq\n");
 702                 ret = -EINVAL;
 703                 goto err_usb_irq;
 704         }
 705
 706         /* Clocks. */
 707         sprop = of_get_property(node, "fsl,fullspeed-clock", NULL);
 708         if (sprop) {
 709                 fhci->fullspeed_clk = qe_clock_source(sprop);
 710                 if (fhci->fullspeed_clk == QE_CLK_DUMMY) {
 711                         dev_err(dev, "wrong fullspeed-clock\n");
 712                         ret = -EINVAL;
 713                         goto err_clocks;
 714                 }
 715         }
 716
 717         sprop = of_get_property(node, "fsl,lowspeed-clock", NULL);
 718         if (sprop) {
 719                 fhci->lowspeed_clk = qe_clock_source(sprop);
 720                 if (fhci->lowspeed_clk == QE_CLK_DUMMY) {
 721                         dev_err(dev, "wrong lowspeed-clock\n");
 722                         ret = -EINVAL;
 723                         goto err_clocks;
 724                 }
 725         }
 726
 727         if (fhci->fullspeed_clk == QE_CLK_NONE &&
 728                         fhci->lowspeed_clk == QE_CLK_NONE) {
 729                 dev_err(dev, "no clocks specified\n");
 730                 ret = -EINVAL;
 731                 goto err_clocks;
 732         }
 733
 734         dev_info(dev, "at 0x%p, irq %d\n", hcd->regs, usb_irq);
 735
 736         fhci_config_transceiver(fhci, FHCI_PORT_POWER_OFF);
 737
 738         /* Start with full-speed, if possible. */
 739         if (fhci->fullspeed_clk != QE_CLK_NONE) {
 740                 fhci_config_transceiver(fhci, FHCI_PORT_FULL);
 741                 qe_usb_clock_set(fhci->fullspeed_clk, USB_CLOCK);
 742         } else {
 743                 fhci_config_transceiver(fhci, FHCI_PORT_LOW);
 744                 qe_usb_clock_set(fhci->lowspeed_clk, USB_CLOCK >> 3);
 745         }
 746
 747         /* Clear and disable any pending interrupts. */
 748         out_be16(&fhci->regs->usb_event, 0xffff);
 749         out_be16(&fhci->regs->usb_mask, 0);
 750
 751         ret = usb_add_hcd(hcd, usb_irq, 0);
 752         if (ret < 0)
 753                 goto err_add_hcd;
 754
 755         fhci_dfs_create(fhci);
 756
 757         return 0;
 758
 759 err_add_hcd:
 760 err_clocks:
 761         irq_dispose_mapping(usb_irq);
 762 err_usb_irq:
 763         free_irq(fhci->timer->irq, hcd);
 764 err_timer_irq:
 765         gtm_put_timer16(fhci->timer);
 766 err_get_timer:
 767 err_pins:
 768         while (--j >= 0)
 769                 qe_pin_free(fhci->pins[j]);
 770 err_gpios:
 771         while (--i >= 0) {
 772                 if (gpio_is_valid(fhci->gpios[i]))
 773                         gpio_free(fhci->gpios[i]);
 774         }
 775         cpm_muram_free(pram_addr);
 776 err_pram:
 777         iounmap(hcd->regs);
 778 err_regs:
 779         usb_put_hcd(hcd);
 780         return ret;
 781 }
 782
 783 static int __devexit fhci_remove(struct device *dev)
 784 {
 785         struct usb_hcd *hcd = dev_get_drvdata(dev);
 786         struct fhci_hcd *fhci = hcd_to_fhci(hcd);
 787         int i;
 788         int j;
 789
 790         usb_remove_hcd(hcd);
 791         free_irq(fhci->timer->irq, hcd);
 792         gtm_put_timer16(fhci->timer);
 793         cpm_muram_free(cpm_muram_offset(fhci->pram));
 794         for (i = 0; i < NUM_GPIOS; i++) {
 795                 if (!gpio_is_valid(fhci->gpios[i]))
 796                         continue;
 797                 gpio_free(fhci->gpios[i]);
 798         }
 799         for (j = 0; j < NUM_PINS; j++)
 800                 qe_pin_free(fhci->pins[j]);
 801         fhci_dfs_destroy(fhci);
 802         usb_put_hcd(hcd);
 803         return 0;
 804 }
 805
 806 static int __devexit of_fhci_remove(struct platform_device *ofdev)
 807 {
 808         return fhci_remove(&ofdev->dev);
 809 }
 810
 811 static const struct of_device_id of_fhci_match[] = {
 812         { .compatible = "fsl,mpc8323-qe-usb", },
 813         {},
 814 };
 815 MODULE_DEVICE_TABLE(of, of_fhci_match);
 816
 817 static struct platform_driver of_fhci_driver = {
 818         .driver = {
 819                 .name = "fsl,usb-fhci",
 820                 .owner = THIS_MODULE,
 821                 .of_match_table = of_fhci_match,
 822         },
 823         .probe          = of_fhci_probe,
 824         .remove         = __devexit_p(of_fhci_remove),
 825 };
 826
 827 static int __init fhci_module_init(void)
 828 {
 829         return platform_driver_register(&of_fhci_driver);
 830 }
 831 module_init(fhci_module_init);
 832
 833 static void __exit fhci_module_exit(void)
 834 {
 835         platform_driver_unregister(&of_fhci_driver);
 836 }
 837 module_exit(fhci_module_exit);
 838
 839 MODULE_DESCRIPTION("USB Freescale Host Controller Interface Driver");
 840 MODULE_AUTHOR("Shlomi Gridish <gridish@freescale.com>, "
 841               "Jerry Huang <Chang-Ming.Huang@freescale.com>, "
 842               "Anton Vorontsov <avorontsov@ru.mvista.com>");
 843 MODULE_LICENSE("GPL");