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/uwb/umc.h>
  20
  21#include "../../wusbcore/wusbhc.h"
  22
  23#include "whcd.h"
  24
  25static 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
  31irqreturn_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
  67static 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
  85void 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}
  94