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Linux/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/module.h>
 21 #include <linux/uwb/umc.h>
 22 
 23 #include "../../wusbcore/wusbhc.h"
 24 
 25 #include "whcd.h"
 26 
 27 /*
 28  * One time initialization.
 29  *
 30  * Nothing to do here.
 31  */
 32 static int whc_reset(struct usb_hcd *usb_hcd)
 33 {
 34         return 0;
 35 }
 36 
 37 /*
 38  * Start the wireless host controller.
 39  *
 40  * Start device notification.
 41  *
 42  * Put hc into run state, set DNTS parameters.
 43  */
 44 static int whc_start(struct usb_hcd *usb_hcd)
 45 {
 46         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 47         struct whc *whc = wusbhc_to_whc(wusbhc);
 48         u8 bcid;
 49         int ret;
 50 
 51         mutex_lock(&wusbhc->mutex);
 52 
 53         le_writel(WUSBINTR_GEN_CMD_DONE
 54                   | WUSBINTR_HOST_ERR
 55                   | WUSBINTR_ASYNC_SCHED_SYNCED
 56                   | WUSBINTR_DNTS_INT
 57                   | WUSBINTR_ERR_INT
 58                   | WUSBINTR_INT,
 59                   whc->base + WUSBINTR);
 60 
 61         /* set cluster ID */
 62         bcid = wusb_cluster_id_get();
 63         ret = whc_set_cluster_id(whc, bcid);
 64         if (ret < 0)
 65                 goto out;
 66         wusbhc->cluster_id = bcid;
 67 
 68         /* start HC */
 69         whc_write_wusbcmd(whc, WUSBCMD_RUN, WUSBCMD_RUN);
 70 
 71         usb_hcd->uses_new_polling = 1;
 72         set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
 73         usb_hcd->state = HC_STATE_RUNNING;
 74 
 75 out:
 76         mutex_unlock(&wusbhc->mutex);
 77         return ret;
 78 }
 79 
 80 
 81 /*
 82  * Stop the wireless host controller.
 83  *
 84  * Stop device notification.
 85  *
 86  * Wait for pending transfer to stop? Put hc into stop state?
 87  */
 88 static void whc_stop(struct usb_hcd *usb_hcd)
 89 {
 90         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
 91         struct whc *whc = wusbhc_to_whc(wusbhc);
 92 
 93         mutex_lock(&wusbhc->mutex);
 94 
 95         /* stop HC */
 96         le_writel(0, whc->base + WUSBINTR);
 97         whc_write_wusbcmd(whc, WUSBCMD_RUN, 0);
 98         whci_wait_for(&whc->umc->dev, whc->base + WUSBSTS,
 99                       WUSBSTS_HCHALTED, WUSBSTS_HCHALTED,
100                       100, "HC to halt");
101 
102         wusb_cluster_id_put(wusbhc->cluster_id);
103 
104         mutex_unlock(&wusbhc->mutex);
105 }
106 
107 static int whc_get_frame_number(struct usb_hcd *usb_hcd)
108 {
109         /* Frame numbers are not applicable to WUSB. */
110         return -ENOSYS;
111 }
112 
113 
114 /*
115  * Queue an URB to the ASL or PZL
116  */
117 static int whc_urb_enqueue(struct usb_hcd *usb_hcd, struct urb *urb,
118                            gfp_t mem_flags)
119 {
120         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
121         struct whc *whc = wusbhc_to_whc(wusbhc);
122         int ret;
123 
124         switch (usb_pipetype(urb->pipe)) {
125         case PIPE_INTERRUPT:
126                 ret = pzl_urb_enqueue(whc, urb, mem_flags);
127                 break;
128         case PIPE_ISOCHRONOUS:
129                 dev_err(&whc->umc->dev, "isochronous transfers unsupported\n");
130                 ret = -ENOTSUPP;
131                 break;
132         case PIPE_CONTROL:
133         case PIPE_BULK:
134         default:
135                 ret = asl_urb_enqueue(whc, urb, mem_flags);
136                 break;
137         }
138 
139         return ret;
140 }
141 
142 /*
143  * Remove a queued URB from the ASL or PZL.
144  */
145 static int whc_urb_dequeue(struct usb_hcd *usb_hcd, struct urb *urb, int status)
146 {
147         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
148         struct whc *whc = wusbhc_to_whc(wusbhc);
149         int ret;
150 
151         switch (usb_pipetype(urb->pipe)) {
152         case PIPE_INTERRUPT:
153                 ret = pzl_urb_dequeue(whc, urb, status);
154                 break;
155         case PIPE_ISOCHRONOUS:
156                 ret = -ENOTSUPP;
157                 break;
158         case PIPE_CONTROL:
159         case PIPE_BULK:
160         default:
161                 ret = asl_urb_dequeue(whc, urb, status);
162                 break;
163         }
164 
165         return ret;
166 }
167 
168 /*
169  * Wait for all URBs to the endpoint to be completed, then delete the
170  * qset.
171  */
172 static void whc_endpoint_disable(struct usb_hcd *usb_hcd,
173                                  struct usb_host_endpoint *ep)
174 {
175         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
176         struct whc *whc = wusbhc_to_whc(wusbhc);
177         struct whc_qset *qset;
178 
179         qset = ep->hcpriv;
180         if (qset) {
181                 ep->hcpriv = NULL;
182                 if (usb_endpoint_xfer_bulk(&ep->desc)
183                     || usb_endpoint_xfer_control(&ep->desc))
184                         asl_qset_delete(whc, qset);
185                 else
186                         pzl_qset_delete(whc, qset);
187         }
188 }
189 
190 static void whc_endpoint_reset(struct usb_hcd *usb_hcd,
191                                struct usb_host_endpoint *ep)
192 {
193         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(usb_hcd);
194         struct whc *whc = wusbhc_to_whc(wusbhc);
195         struct whc_qset *qset;
196         unsigned long flags;
197 
198         spin_lock_irqsave(&whc->lock, flags);
199 
200         qset = ep->hcpriv;
201         if (qset) {
202                 qset->remove = 1;
203                 qset->reset = 1;
204 
205                 if (usb_endpoint_xfer_bulk(&ep->desc)
206                     || usb_endpoint_xfer_control(&ep->desc))
207                         queue_work(whc->workqueue, &whc->async_work);
208                 else
209                         queue_work(whc->workqueue, &whc->periodic_work);
210         }
211 
212         spin_unlock_irqrestore(&whc->lock, flags);
213 }
214 
215 
216 static struct hc_driver whc_hc_driver = {
217         .description = "whci-hcd",
218         .product_desc = "Wireless host controller",
219         .hcd_priv_size = sizeof(struct whc) - sizeof(struct usb_hcd),
220         .irq = whc_int_handler,
221         .flags = HCD_USB2,
222 
223         .reset = whc_reset,
224         .start = whc_start,
225         .stop = whc_stop,
226         .get_frame_number = whc_get_frame_number,
227         .urb_enqueue = whc_urb_enqueue,
228         .urb_dequeue = whc_urb_dequeue,
229         .endpoint_disable = whc_endpoint_disable,
230         .endpoint_reset = whc_endpoint_reset,
231 
232         .hub_status_data = wusbhc_rh_status_data,
233         .hub_control = wusbhc_rh_control,
234         .start_port_reset = wusbhc_rh_start_port_reset,
235 };
236 
237 static int whc_probe(struct umc_dev *umc)
238 {
239         int ret;
240         struct usb_hcd *usb_hcd;
241         struct wusbhc *wusbhc;
242         struct whc *whc;
243         struct device *dev = &umc->dev;
244 
245         usb_hcd = usb_create_hcd(&whc_hc_driver, dev, "whci");
246         if (usb_hcd == NULL) {
247                 dev_err(dev, "unable to create hcd\n");
248                 return -ENOMEM;
249         }
250 
251         usb_hcd->wireless = 1;
252         usb_hcd->self.sg_tablesize = 2048; /* somewhat arbitrary */
253 
254         wusbhc = usb_hcd_to_wusbhc(usb_hcd);
255         whc = wusbhc_to_whc(wusbhc);
256         whc->umc = umc;
257 
258         ret = whc_init(whc);
259         if (ret)
260                 goto error;
261 
262         wusbhc->dev = dev;
263         wusbhc->uwb_rc = uwb_rc_get_by_grandpa(umc->dev.parent);
264         if (!wusbhc->uwb_rc) {
265                 ret = -ENODEV;
266                 dev_err(dev, "cannot get radio controller\n");
267                 goto error;
268         }
269 
270         if (whc->n_devices > USB_MAXCHILDREN) {
271                 dev_warn(dev, "USB_MAXCHILDREN too low for WUSB adapter (%u ports)\n",
272                          whc->n_devices);
273                 wusbhc->ports_max = USB_MAXCHILDREN;
274         } else
275                 wusbhc->ports_max = whc->n_devices;
276         wusbhc->mmcies_max      = whc->n_mmc_ies;
277         wusbhc->start           = whc_wusbhc_start;
278         wusbhc->stop            = whc_wusbhc_stop;
279         wusbhc->mmcie_add       = whc_mmcie_add;
280         wusbhc->mmcie_rm        = whc_mmcie_rm;
281         wusbhc->dev_info_set    = whc_dev_info_set;
282         wusbhc->bwa_set         = whc_bwa_set;
283         wusbhc->set_num_dnts    = whc_set_num_dnts;
284         wusbhc->set_ptk         = whc_set_ptk;
285         wusbhc->set_gtk         = whc_set_gtk;
286 
287         ret = wusbhc_create(wusbhc);
288         if (ret)
289                 goto error_wusbhc_create;
290 
291         ret = usb_add_hcd(usb_hcd, whc->umc->irq, IRQF_SHARED);
292         if (ret) {
293                 dev_err(dev, "cannot add HCD: %d\n", ret);
294                 goto error_usb_add_hcd;
295         }
296         device_wakeup_enable(usb_hcd->self.controller);
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");
368 

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