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/version.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/uwb/umc.h>
  22
  23 #include "../../wusbcore/wusbhc.h"
  24
  25 #include "whcd.h"
  26
  27 static void transfer_done(struct whc *whc)
  28 {
  29         queue_work(whc->workqueue, &whc->async_work);
  30         queue_work(whc->workqueue, &whc->periodic_work);
  31 }
  32
  33 irqreturn_t whc_int_handler(struct usb_hcd *hcd)
  34 {
  35         struct wusbhc *wusbhc = usb_hcd_to_wusbhc(hcd);
  36         struct whc *whc = wusbhc_to_whc(wusbhc);
  37         u32 sts;
  38
  39         sts = le_readl(whc->base + WUSBSTS);
  40         if (!(sts & WUSBSTS_INT_MASK))
  41                 return IRQ_NONE;
  42         le_writel(sts & WUSBSTS_INT_MASK, whc->base + WUSBSTS);
  43
  44         if (sts & WUSBSTS_GEN_CMD_DONE)
  45                 wake_up(&whc->cmd_wq);
  46
  47         if (sts & WUSBSTS_HOST_ERR)
  48                 dev_err(&whc->umc->dev, "FIXME: host system error\n");
  49
  50         if (sts & WUSBSTS_ASYNC_SCHED_SYNCED)
  51                 wake_up(&whc->async_list_wq);
  52
  53         if (sts & WUSBSTS_PERIODIC_SCHED_SYNCED)
  54                 wake_up(&whc->periodic_list_wq);
  55
  56         if (sts & WUSBSTS_DNTS_INT)
  57                 queue_work(whc->workqueue, &whc->dn_work);
  58
  59         /*
  60          * A transfer completed (see [WHCI] section 4.7.1.2 for when
  61          * this occurs).
  62          */
  63         if (sts & (WUSBSTS_INT | WUSBSTS_ERR_INT))
  64                 transfer_done(whc);
  65
  66         return IRQ_HANDLED;
  67 }
  68
  69 static int process_dn_buf(struct whc *whc)
  70 {
  71         struct wusbhc *wusbhc = &whc->wusbhc;
  72         struct dn_buf_entry *dn;
  73         int processed = 0;
  74
  75         for (dn = whc->dn_buf; dn < whc->dn_buf + WHC_N_DN_ENTRIES; dn++) {
  76                 if (dn->status & WHC_DN_STATUS_VALID) {
  77                         wusbhc_handle_dn(wusbhc, dn->src_addr,
  78                                          (struct wusb_dn_hdr *)dn->dn_data,
  79                                          dn->msg_size);
  80                         dn->status &= ~WHC_DN_STATUS_VALID;
  81                         processed++;
  82                 }
  83         }
  84         return processed;
  85 }
  86
  87 void whc_dn_work(struct work_struct *work)
  88 {
  89         struct whc *whc = container_of(work, struct whc, dn_work);
  90         int processed;
  91
  92         do {
  93                 processed = process_dn_buf(whc);
  94         } while (processed);
  95 }