drivers/usb/host/whci/hcd.c

   1 /*
   2  * Wireless Host Controller (WHC) driver.
   3  *
   4  * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/uwb/umc.h>
  21
  22 #include "../../wusbcore/wusbhc.h"
  23
  24 #include "whcd.h"
  25
  26 /*
  27  * One time initialization.
  28  *
  29  * Nothing to do here.
  30  */
  31 static int whc_reset(struct usb_hcd *usb_hcd)
  32 {
  33         return 0;
  34 }
  35
  36 /*
  37  * Start the wireless host controller.
  38  *
  39  * Start device notification.
  40  *
  41  * Put hc into run state, set DNTS parameters.
  42  */
  43 static int whc_start(struct usb_hcd *usb_hcd)
  44 {
  45         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
  46         struct whc *whc = wusbhc_to_whc(wusbhc);
  47         u8 bcid;
  48         int ret;
  49
  50         mutex_lock(&wusbhc->mutex);
  51
  52         le_writel(WUSBINTR_GEN_CMD_DONE
  53                   | WUSBINTR_HOST_ERR
  54                   | WUSBINTR_ASYNC_SCHED_SYNCED
  55                   | WUSBINTR_DNTS_INT
  56                   | WUSBINTR_ERR_INT
  57                   | WUSBINTR_INT,
  58                   whc->base + WUSBINTR);
  59
  60         /* set cluster ID */
  61         bcid = wusb_cluster_id_get();
  62         ret = whc_set_cluster_id(whc, bcid);
  63         if (ret < 0)
  64                 goto out;
  65         wusbhc->cluster_id = bcid;
  66
  67         /* start HC */
  68         whc_write_wusbcmd(whc, WUSBCMD_RUN, WUSBCMD_RUN);
  69
  70         usb_hcd->uses_new_polling = 1;
  71         set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
  72         usb_hcd->state = HC_STATE_RUNNING;
  73
  74 out:
  75         mutex_unlock(&wusbhc->mutex);
  76         return ret;
  77 }
  78
  79
  80 /*
  81  * Stop the wireless host controller.
  82  *
  83  * Stop device notification.
  84  *
  85  * Wait for pending transfer to stop? Put hc into stop state?
  86  */
  87 static void whc_stop(struct usb_hcd *usb_hcd)
  88 {
  89         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
  90         struct whc *whc = wusbhc_to_whc(wusbhc);
  91
  92         mutex_lock(&wusbhc->mutex);
  93
  94         /* stop HC */
  95         le_writel(0, whc->base + WUSBINTR);
  96         whc_write_wusbcmd(whc, WUSBCMD_RUN, 0);
  97         whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
  98                       WUSBSTS_HCHALTED, WUSBSTS_HCHALTED,
  99                       100, "HC to halt");
 100
 101         wusb_cluster_id_put(wusbhc->cluster_id);
 102
 103         mutex_unlock(&wusbhc->mutex);
 104 }
 105
 106 static int whc_get_frame_number(struct usb_hcd *usb_hcd)
 107 {
 108         /* Frame numbers are not applicable to WUSB. */
 109         return -ENOSYS;
 110 }
 111
 112
 113 /*
 114  * Queue an URB to the ASL or PZL
 115  */
 116 static int whc_urb_enqueue(struct usb_hcd *usb_hcd, struct urb *urb,
 117                            gfp_t mem_flags)
 118 {
 119         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 120         struct whc *whc = wusbhc_to_whc(wusbhc);
 121         int ret;
 122
 123         switch (usb_pipetype(urb->pipe)) {
 124         case PIPE_INTERRUPT:
 125                 ret = pzl_urb_enqueue(whc, urb, mem_flags);
 126                 break;
 127         case PIPE_ISOCHRONOUS:
 128                 dev_err(&whc->umc->dev, "isochronous transfers unsupported\n");
 129                 ret = -ENOTSUPP;
 130                 break;
 131         case PIPE_CONTROL:
 132         case PIPE_BULK:
 133         default:
 134                 ret = asl_urb_enqueue(whc, urb, mem_flags);
 135                 break;
 136         };
 137
 138         return ret;
 139 }
 140
 141 /*
 142  * Remove a queued URB from the ASL or PZL.
 143  */
 144 static int whc_urb_dequeue(struct usb_hcd *usb_hcd, struct urb *urb, int status)
 145 {
 146         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 147         struct whc *whc = wusbhc_to_whc(wusbhc);
 148         int ret;
 149
 150         switch (usb_pipetype(urb->pipe)) {
 151         case PIPE_INTERRUPT:
 152                 ret = pzl_urb_dequeue(whc, urb, status);
 153                 break;
 154         case PIPE_ISOCHRONOUS:
 155                 ret = -ENOTSUPP;
 156                 break;
 157         case PIPE_CONTROL:
 158         case PIPE_BULK:
 159         default:
 160                 ret = asl_urb_dequeue(whc, urb, status);
 161                 break;
 162         };
 163
 164         return ret;
 165 }
 166
 167 /*
 168  * Wait for all URBs to the endpoint to be completed, then delete the
 169  * qset.
 170  */
 171 static void whc_endpoint_disable(struct usb_hcd *usb_hcd,
 172                                  struct usb_host_endpoint *ep)
 173 {
 174         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 175         struct whc *whc = wusbhc_to_whc(wusbhc);
 176         struct whc_qset *qset;
 177
 178         qset = ep->hcpriv;
 179         if (qset) {
 180                 ep->hcpriv = NULL;
 181                 if (usb_endpoint_xfer_bulk(&ep->desc)
 182                     || usb_endpoint_xfer_control(&ep->desc))
 183                         asl_qset_delete(whc, qset);
 184                 else
 185                         pzl_qset_delete(whc, qset);
 186         }
 187 }
 188
 189 static void whc_endpoint_reset(struct usb_hcd *usb_hcd,
 190                                struct usb_host_endpoint *ep)
 191 {
 192         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 193         struct whc *whc = wusbhc_to_whc(wusbhc);
 194         struct whc_qset *qset;
 195         unsigned long flags;
 196
 197         spin_lock_irqsave(&whc->lock, flags);
 198
 199         qset = ep->hcpriv;
 200         if (qset) {
 201                 qset->remove = 1;
 202                 qset->reset = 1;
 203
 204                 if (usb_endpoint_xfer_bulk(&ep->desc)
 205                     || usb_endpoint_xfer_control(&ep->desc))
 206                         queue_work(whc->workqueue, &whc->async_work);
 207                 else
 208                         queue_work(whc->workqueue, &whc->periodic_work);
 209         }
 210
 211         spin_unlock_irqrestore(&whc->lock, flags);
 212 }
 213
 214
 215 static struct hc_driver whc_hc_driver = {
 216         .description = "whci-hcd",
 217         .product_desc = "Wireless host controller",
 218         .hcd_priv_size = sizeof(struct whc) - sizeof(struct usb_hcd),
 219         .irq = whc_int_handler,
 220         .flags = HCD_USB2,
 221
 222         .reset = whc_reset,
 223         .start = whc_start,
 224         .stop = whc_stop,
 225         .get_frame_number = whc_get_frame_number,
 226         .urb_enqueue = whc_urb_enqueue,
 227         .urb_dequeue = whc_urb_dequeue,
 228         .endpoint_disable = whc_endpoint_disable,
 229         .endpoint_reset = whc_endpoint_reset,
 230
 231         .hub_status_data = wusbhc_rh_status_data,
 232         .hub_control = wusbhc_rh_control,
 233         .bus_suspend = wusbhc_rh_suspend,
 234         .bus_resume = wusbhc_rh_resume,
 235         .start_port_reset = wusbhc_rh_start_port_reset,
 236 };
 237
 238 static int whc_probe(struct umc_dev *umc)
 239 {
 240         int ret = -ENOMEM;
 241         struct usb_hcd *usb_hcd;
 242         struct wusbhc *wusbhc = NULL;
 243         struct whc *whc = NULL;
 244         struct device *dev = &umc->dev;
 245
 246         usb_hcd = usb_create_hcd(&whc_hc_driver, dev, "whci");
 247         if (usb_hcd == NULL) {
 248                 dev_err(dev, "unable to create hcd\n");
 249                 goto error;
 250         }
 251
 252         usb_hcd->wireless = 1;
 253         usb_hcd->self.sg_tablesize = 2048; /* somewhat arbitrary */
 254
 255         wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 256         whc = wusbhc_to_whc(wusbhc);
 257         whc->umc = umc;
 258
 259         ret = whc_init(whc);
 260         if (ret)
 261                 goto error;
 262
 263         wusbhc->dev = dev;
 264         wusbhc->uwb_rc = uwb_rc_get_by_grandpa(umc->dev.parent);
 265         if (!wusbhc->uwb_rc) {
 266                 ret = -ENODEV;
 267                 dev_err(dev, "cannot get radio controller\n");
 268                 goto error;
 269         }
 270
 271         if (whc->n_devices > USB_MAXCHILDREN) {
 272                 dev_warn(dev, "USB_MAXCHILDREN too low for WUSB adapter (%u ports)\n",
 273                          whc->n_devices);
 274                 wusbhc->ports_max = USB_MAXCHILDREN;
 275         } else
 276                 wusbhc->ports_max = whc->n_devices;
 277         wusbhc->mmcies_max      = whc->n_mmc_ies;
 278         wusbhc->start           = whc_wusbhc_start;
 279         wusbhc->stop            = whc_wusbhc_stop;
 280         wusbhc->mmcie_add       = whc_mmcie_add;
 281         wusbhc->mmcie_rm        = whc_mmcie_rm;
 282         wusbhc->dev_info_set    = whc_dev_info_set;
 283         wusbhc->bwa_set         = whc_bwa_set;
 284         wusbhc->set_num_dnts    = whc_set_num_dnts;
 285         wusbhc->set_ptk         = whc_set_ptk;
 286         wusbhc->set_gtk         = whc_set_gtk;
 287
 288         ret = wusbhc_create(wusbhc);
 289         if (ret)
 290                 goto error_wusbhc_create;
 291
 292         ret = usb_add_hcd(usb_hcd, whc->umc->irq, IRQF_SHARED);
 293         if (ret) {
 294                 dev_err(dev, "cannot add HCD: %d\n", ret);
 295                 goto error_usb_add_hcd;
 296         }
 297
 298         ret = wusbhc_b_create(wusbhc);
 299         if (ret) {
 300                 dev_err(dev, "WUSBHC phase B setup failed: %d\n", ret);
 301                 goto error_wusbhc_b_create;
 302         }
 303
 304         whc_dbg_init(whc);
 305
 306         return 0;
 307
 308 error_wusbhc_b_create:
 309         usb_remove_hcd(usb_hcd);
 310 error_usb_add_hcd:
 311         wusbhc_destroy(wusbhc);
 312 error_wusbhc_create:
 313         uwb_rc_put(wusbhc->uwb_rc);
 314 error:
 315         whc_clean_up(whc);
 316         if (usb_hcd)
 317                 usb_put_hcd(usb_hcd);
 318         return ret;
 319 }
 320
 321
 322 static void whc_remove(struct umc_dev *umc)
 323 {
 324         struct usb_hcd *usb_hcd = dev_get_drvdata(&umc->dev);
 325         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 326         struct whc *whc = wusbhc_to_whc(wusbhc);
 327
 328         if (usb_hcd) {
 329                 whc_dbg_clean_up(whc);
 330                 wusbhc_b_destroy(wusbhc);
 331                 usb_remove_hcd(usb_hcd);
 332                 wusbhc_destroy(wusbhc);
 333                 uwb_rc_put(wusbhc->uwb_rc);
 334                 whc_clean_up(whc);
 335                 usb_put_hcd(usb_hcd);
 336         }
 337 }
 338
 339 static struct umc_driver whci_hc_driver = {
 340         .name =         "whci-hcd",
 341         .cap_id =       UMC_CAP_ID_WHCI_WUSB_HC,
 342         .probe =        whc_probe,
 343         .remove =       whc_remove,
 344 };
 345
 346 static int __init whci_hc_driver_init(void)
 347 {
 348         return umc_driver_register(&whci_hc_driver);
 349 }
 350 module_init(whci_hc_driver_init);
 351
 352 static void __exit whci_hc_driver_exit(void)
 353 {
 354         umc_driver_unregister(&whci_hc_driver);
 355 }
 356 module_exit(whci_hc_driver_exit);
 357
 358 /* PCI device ID's that we handle (so it gets loaded) */
 359 static struct pci_device_id __used whci_hcd_id_table[] = {
 360         { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
 361         { /* empty last entry */ }
 362 };
 363 MODULE_DEVICE_TABLE(pci, whci_hcd_id_table);
 364
 365 MODULE_DESCRIPTION("WHCI Wireless USB host controller driver");
 366 MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
 367 MODULE_LICENSE("GPL");