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 struct hc_driver whc_hc_driver = {
 190         .description = "whci-hcd",
 191         .product_desc = "Wireless host controller",
 192         .hcd_priv_size = sizeof(struct whc) - sizeof(struct usb_hcd),
 193         .irq = whc_int_handler,
 194         .flags = HCD_USB2,
 195
 196         .reset = whc_reset,
 197         .start = whc_start,
 198         .stop = whc_stop,
 199         .get_frame_number = whc_get_frame_number,
 200         .urb_enqueue = whc_urb_enqueue,
 201         .urb_dequeue = whc_urb_dequeue,
 202         .endpoint_disable = whc_endpoint_disable,
 203
 204         .hub_status_data = wusbhc_rh_status_data,
 205         .hub_control = wusbhc_rh_control,
 206         .bus_suspend = wusbhc_rh_suspend,
 207         .bus_resume = wusbhc_rh_resume,
 208         .start_port_reset = wusbhc_rh_start_port_reset,
 209 };
 210
 211 static int whc_probe(struct umc_dev *umc)
 212 {
 213         int ret = -ENOMEM;
 214         struct usb_hcd *usb_hcd;
 215         struct wusbhc *wusbhc = NULL;
 216         struct whc *whc = NULL;
 217         struct device *dev = &umc->dev;
 218
 219         usb_hcd = usb_create_hcd(&whc_hc_driver, dev, "whci");
 220         if (usb_hcd == NULL) {
 221                 dev_err(dev, "unable to create hcd\n");
 222                 goto error;
 223         }
 224
 225         usb_hcd->wireless = 1;
 226
 227         wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 228         whc = wusbhc_to_whc(wusbhc);
 229         whc->umc = umc;
 230
 231         ret = whc_init(whc);
 232         if (ret)
 233                 goto error;
 234
 235         wusbhc->dev = dev;
 236         wusbhc->uwb_rc = uwb_rc_get_by_grandpa(umc->dev.parent);
 237         if (!wusbhc->uwb_rc) {
 238                 ret = -ENODEV;
 239                 dev_err(dev, "cannot get radio controller\n");
 240                 goto error;
 241         }
 242
 243         if (whc->n_devices > USB_MAXCHILDREN) {
 244                 dev_warn(dev, "USB_MAXCHILDREN too low for WUSB adapter (%u ports)\n",
 245                          whc->n_devices);
 246                 wusbhc->ports_max = USB_MAXCHILDREN;
 247         } else
 248                 wusbhc->ports_max = whc->n_devices;
 249         wusbhc->mmcies_max      = whc->n_mmc_ies;
 250         wusbhc->start           = whc_wusbhc_start;
 251         wusbhc->stop            = whc_wusbhc_stop;
 252         wusbhc->mmcie_add       = whc_mmcie_add;
 253         wusbhc->mmcie_rm        = whc_mmcie_rm;
 254         wusbhc->dev_info_set    = whc_dev_info_set;
 255         wusbhc->bwa_set         = whc_bwa_set;
 256         wusbhc->set_num_dnts    = whc_set_num_dnts;
 257         wusbhc->set_ptk         = whc_set_ptk;
 258         wusbhc->set_gtk         = whc_set_gtk;
 259
 260         ret = wusbhc_create(wusbhc);
 261         if (ret)
 262                 goto error_wusbhc_create;
 263
 264         ret = usb_add_hcd(usb_hcd, whc->umc->irq, IRQF_SHARED);
 265         if (ret) {
 266                 dev_err(dev, "cannot add HCD: %d\n", ret);
 267                 goto error_usb_add_hcd;
 268         }
 269
 270         ret = wusbhc_b_create(wusbhc);
 271         if (ret) {
 272                 dev_err(dev, "WUSBHC phase B setup failed: %d\n", ret);
 273                 goto error_wusbhc_b_create;
 274         }
 275
 276         return 0;
 277
 278 error_wusbhc_b_create:
 279         usb_remove_hcd(usb_hcd);
 280 error_usb_add_hcd:
 281         wusbhc_destroy(wusbhc);
 282 error_wusbhc_create:
 283         uwb_rc_put(wusbhc->uwb_rc);
 284 error:
 285         whc_clean_up(whc);
 286         if (usb_hcd)
 287                 usb_put_hcd(usb_hcd);
 288         return ret;
 289 }
 290
 291
 292 static void whc_remove(struct umc_dev *umc)
 293 {
 294         struct usb_hcd *usb_hcd = dev_get_drvdata(&umc->dev);
 295         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 296         struct whc *whc = wusbhc_to_whc(wusbhc);
 297
 298         if (usb_hcd) {
 299                 wusbhc_b_destroy(wusbhc);
 300                 usb_remove_hcd(usb_hcd);
 301                 wusbhc_destroy(wusbhc);
 302                 uwb_rc_put(wusbhc->uwb_rc);
 303                 whc_clean_up(whc);
 304                 usb_put_hcd(usb_hcd);
 305         }
 306 }
 307
 308 static struct umc_driver whci_hc_driver = {
 309         .name =         "whci-hcd",
 310         .cap_id =       UMC_CAP_ID_WHCI_WUSB_HC,
 311         .probe =        whc_probe,
 312         .remove =       whc_remove,
 313 };
 314
 315 static int __init whci_hc_driver_init(void)
 316 {
 317         return umc_driver_register(&whci_hc_driver);
 318 }
 319 module_init(whci_hc_driver_init);
 320
 321 static void __exit whci_hc_driver_exit(void)
 322 {
 323         umc_driver_unregister(&whci_hc_driver);
 324 }
 325 module_exit(whci_hc_driver_exit);
 326
 327 /* PCI device ID's that we handle (so it gets loaded) */
 328 static struct pci_device_id whci_hcd_id_table[] = {
 329         { PCI_DEVICE_CLASS(PCI_CLASS_WIRELESS_WHCI, ~0) },
 330         { /* empty last entry */ }
 331 };
 332 MODULE_DEVICE_TABLE(pci, whci_hcd_id_table);
 333
 334 MODULE_DESCRIPTION("WHCI Wireless USB host controller driver");
 335 MODULE_AUTHOR("Cambridge Silicon Radio Ltd.");
 336 MODULE_LICENSE("GPL");