git.oblomov.eu Git - linux-2.6/blob - 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         usb_hcd->poll_rh = 1;
  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
 196         qset = ep->hcpriv;
 197         if (qset) {
 198                 qset->remove = 1;
 199
 200                 if (usb_endpoint_xfer_bulk(&ep->desc)
 201                     || usb_endpoint_xfer_control(&ep->desc))
 202                         queue_work(whc->workqueue, &whc->async_work);
 203                 else
 204                         queue_work(whc->workqueue, &whc->periodic_work);
 205
 206                 qset_reset(whc, qset);
 207         }
 208 }
 209
 210
 211 static struct hc_driver whc_hc_driver = {
 212         .description = "whci-hcd",
 213         .product_desc = "Wireless host controller",
 214         .hcd_priv_size = sizeof(struct whc) - sizeof(struct usb_hcd),
 215         .irq = whc_int_handler,
 216         .flags = HCD_USB2,
 217
 218         .reset = whc_reset,
 219         .start = whc_start,
 220         .stop = whc_stop,
 221         .get_frame_number = whc_get_frame_number,
 222         .urb_enqueue = whc_urb_enqueue,
 223         .urb_dequeue = whc_urb_dequeue,
 224         .endpoint_disable = whc_endpoint_disable,
 225         .endpoint_reset = whc_endpoint_reset,
 226
 227         .hub_status_data = wusbhc_rh_status_data,
 228         .hub_control = wusbhc_rh_control,
 229         .bus_suspend = wusbhc_rh_suspend,
 230         .bus_resume = wusbhc_rh_resume,
 231         .start_port_reset = wusbhc_rh_start_port_reset,
 232 };
 233
 234 static int whc_probe(struct umc_dev *umc)
 235 {
 236         int ret = -ENOMEM;
 237         struct usb_hcd *usb_hcd;
 238         struct wusbhc *wusbhc = NULL;
 239         struct whc *whc = NULL;
 240         struct device *dev = &umc->dev;
 241
 242         usb_hcd = usb_create_hcd(&whc_hc_driver, dev, "whci");
 243         if (usb_hcd == NULL) {
 244                 dev_err(dev, "unable to create hcd\n");
 245                 goto error;
 246         }
 247
 248         usb_hcd->wireless = 1;
 249
 250         wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 251         whc = wusbhc_to_whc(wusbhc);
 252         whc->umc = umc;
 253
 254         ret = whc_init(whc);
 255         if (ret)
 256                 goto error;
 257
 258         wusbhc->dev = dev;
 259         wusbhc->uwb_rc = uwb_rc_get_by_grandpa(umc->dev.parent);
 260         if (!wusbhc->uwb_rc) {
 261                 ret = -ENODEV;
 262                 dev_err(dev, "cannot get radio controller\n");
 263                 goto error;
 264         }
 265
 266         if (whc->n_devices > USB_MAXCHILDREN) {
 267                 dev_warn(dev, "USB_MAXCHILDREN too low for WUSB adapter (%u ports)\n",
 268                          whc->n_devices);
 269                 wusbhc->ports_max = USB_MAXCHILDREN;
 270         } else
 271                 wusbhc->ports_max = whc->n_devices;
 272         wusbhc->mmcies_max      = whc->n_mmc_ies;
 273         wusbhc->start           = whc_wusbhc_start;
 274         wusbhc->stop            = whc_wusbhc_stop;
 275         wusbhc->mmcie_add       = whc_mmcie_add;
 276         wusbhc->mmcie_rm        = whc_mmcie_rm;
 277         wusbhc->dev_info_set    = whc_dev_info_set;
 278         wusbhc->bwa_set         = whc_bwa_set;
 279         wusbhc->set_num_dnts    = whc_set_num_dnts;
 280         wusbhc->set_ptk         = whc_set_ptk;
 281         wusbhc->set_gtk         = whc_set_gtk;
 282
 283         ret = wusbhc_create(wusbhc);
 284         if (ret)
 285                 goto error_wusbhc_create;
 286
 287         ret = usb_add_hcd(usb_hcd, whc->umc->irq, IRQF_SHARED);
 288         if (ret) {
 289                 dev_err(dev, "cannot add HCD: %d\n", ret);
 290                 goto error_usb_add_hcd;
 291         }
 292
 293         ret = wusbhc_b_create(wusbhc);
 294         if (ret) {
 295                 dev_err(dev, "WUSBHC phase B setup failed: %d\n", ret);
 296                 goto error_wusbhc_b_create;
 297         }
 298
 299         whc_dbg_init(whc);
 300
 301         return 0;
 302
 303 error_wusbhc_b_create:
 304         usb_remove_hcd(usb_hcd);
 305 error_usb_add_hcd:
 306         wusbhc_destroy(wusbhc);
 307 error_wusbhc_create:
 308         uwb_rc_put(wusbhc->uwb_rc);
 309 error:
 310         whc_clean_up(whc);
 311         if (usb_hcd)
 312                 usb_put_hcd(usb_hcd);
 313         return ret;
 314 }
 315
 316
 317 static void whc_remove(struct umc_dev *umc)
 318 {
 319         struct usb_hcd *usb_hcd = dev_get_drvdata(&umc->dev);
 320         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 321         struct whc *whc = wusbhc_to_whc(wusbhc);
 322
 323         if (usb_hcd) {
 324                 whc_dbg_clean_up(whc);
 325                 wusbhc_b_destroy(wusbhc);
 326                 usb_remove_hcd(usb_hcd);
 327                 wusbhc_destroy(wusbhc);
 328                 uwb_rc_put(wusbhc->uwb_rc);
 329                 whc_clean_up(whc);
 330                 usb_put_hcd(usb_hcd);
 331         }
 332 }
 333
 334 static struct umc_driver whci_hc_driver = {
 335         .name =         "whci-hcd",
 336         .cap_id =       UMC_CAP_ID_WHCI_WUSB_HC,
 337         .probe =        whc_probe,
 338         .remove =       whc_remove,
 339 };
 340
 341 static int __init whci_hc_driver_init(void)
 342 {
 343         return umc_driver_register(&whci_hc_driver);
 344 }
 345 module_init(whci_hc_driver_init);
 346
 347 static void __exit whci_hc_driver_exit(void)
 348 {
 349         umc_driver_unregister(&whci_hc_driver);
 350 }
 351 module_exit(whci_hc_driver_exit);
 352
 353 /* PCI device ID's that we handle (so it gets loaded) */
 354 static struct pci_device_id whci_hcd_id_table[] = {
 355         { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
 356         { /* empty last entry */ }
 357 };
 358 MODULE_DEVICE_TABLE(pci, whci_hcd_id_table);
 359
 360 MODULE_DESCRIPTION("WHCI Wireless USB host controller driver");
 361 MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
 362 MODULE_LICENSE("GPL");