fce01174aa9b21b9335ae5d321a7bf9cf6a9b536
[linux-2.6.git] / 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 }