kernel/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/uwb/umc.h>
  20
  21 #include "../../wusbcore/wusbhc.h"
  22
  23 #include "whcd.h"
  24
  25 static void transfer_done(struct whc *whc)
  26 {
  27         queue_work(whc->workqueue, &whc->async_work);
  28         queue_work(whc->workqueue, &whc->periodic_work);
  29 }
  30
  31 irqreturn_t whc_int_handler(struct usb_hcd *hcd)
  32 {
  33         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd);
  34         struct whc *whc = wusbhc_to_whc(wusbhc);
  35         u32 sts;
  36
  37         sts = le_readl(whc->base + WUSBSTS);
  38         if (!(sts & WUSBSTS_INT_MASK))
  39                 return IRQ_NONE;
  40         le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS);
  41
  42         if (sts & WUSBSTS_GEN_CMD_DONE)
  43                 wake_up(&whc->cmd_wq);
  44
  45         if (sts & WUSBSTS_HOST_ERR)
  46                 dev_err(&whc->umc->dev, "FIXME: host system error\n");
  47
  48         if (sts & WUSBSTS_ASYNC_SCHED_SYNCED)
  49                 wake_up(&whc->async_list_wq);
  50
  51         if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED)
  52                 wake_up(&whc->periodic_list_wq);
  53
  54         if (sts & WUSBSTS_DNTS_INT)
  55                 queue_work(whc->workqueue, &whc->dn_work);
  56
  57         /*
  58          * A transfer completed (see [WHCI] section 4.7.1.2 for when
  59          * this occurs).
  60          */
  61         if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT))
  62                 transfer_done(whc);
  63
  64         return IRQ_HANDLED;
  65 }
  66
  67 static int process_dn_buf(struct whc *whc)
  68 {
  69         struct wusbhc *wusbhc = &whc->wusbhc;
  70         struct dn_buf_entry *dn;
  71         int processed = 0;
  72
  73         for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) {
  74                 if (dn->status & WHC_DN_STATUS_VALID) {
  75                         wusbhc_handle_dn(wusbhc, dn->src_addr,
  76                                          (struct wusb_dn_hdr *)dn->dn_data,
  77                                          dn->msg_size);
  78                         dn->status &= ~WHC_DN_STATUS_VALID;
  79                         processed++;
  80                 }
  81         }
  82         return processed;
  83 }
  84
  85 void whc_dn_work(struct work_struct *work)
  86 {
  87         struct whc *whc = container_of(work, struct whc, dn_work);
  88         int processed;
  89
  90         do {
  91                 processed = process_dn_buf(whc);
  92         } while (processed);
  93 }