LXR linux/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
  26static 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
  32irqreturn_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
  68static 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
  86void 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}
  95