Linux Kernel  3.7.1
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int.c
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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 
50  wake_up(&whc->async_list_wq);
51 
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);
80  processed++;
81  }
82  }
83  return processed;
84 }
85 
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 }