drivers/usb/host/whci/int.c

   1 /*
   2  * Wireless Host Controller (WHC) interrupt handling.
   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 static void transfer_done(struct whc *whc)
  27 {
  28         queue_work(whc->workqueue, &whc->async_work);
  29         queue_work(whc->workqueue, &whc->periodic_work);
  30 }
  31
  32 irqreturn_t whc_int_handler(struct usb_hcd *hcd)
  33 {
  34         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd);
  35         struct whc *whc = wusbhc_to_whc(wusbhc);
  36         u32 sts;
  37
  38         sts = le_readl(whc->base + WUSBSTS);
  39         if (!(sts & WUSBSTS_INT_MASK))
  40                 return IRQ_NONE;
  41         le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS);
  42
  43         if (sts & WUSBSTS_GEN_CMD_DONE)
  44                 wake_up(&whc->cmd_wq);
  45
  46         if (sts & WUSBSTS_HOST_ERR)
  47                 dev_err(&whc->umc->dev, "FIXME: host system error\n");
  48
  49         if (sts & WUSBSTS_ASYNC_SCHED_SYNCED)
  50                 wake_up(&whc->async_list_wq);
  51
  52         if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED)
  53                 wake_up(&whc->periodic_list_wq);
  54
  55         if (sts & WUSBSTS_DNTS_INT)
  56                 queue_work(whc->workqueue, &whc->dn_work);
  57
  58         /*
  59          * A transfer completed (see [WHCI] section 4.7.1.2 for when
  60          * this occurs).
  61          */
  62         if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT))
  63                 transfer_done(whc);
  64
  65         return IRQ_HANDLED;
  66 }
  67
  68 static int process_dn_buf(struct whc *whc)
  69 {
  70         struct wusbhc *wusbhc = &whc->wusbhc;
  71         struct dn_buf_entry *dn;
  72         int processed = 0;
  73
  74         for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) {
  75                 if (dn->status & WHC_DN_STATUS_VALID) {
  76                         wusbhc_handle_dn(wusbhc, dn->src_addr,
  77                                          (struct wusb_dn_hdr *)dn->dn_data,
  78                                          dn->msg_size);
  79                         dn->status &= ~WHC_DN_STATUS_VALID;
  80                         processed++;
  81                 }
  82         }
  83         return processed;
  84 }
  85
  86 void whc_dn_work(struct work_struct *work)
  87 {
  88         struct whc *whc = container_of(work, struct whc, dn_work);
  89         int processed;
  90
  91         do {
  92                 processed = process_dn_buf(whc);
  93         } while (processed);
  94 }