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
transfer_done(struct whc * whc)25 static 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
whc_int_handler(struct usb_hcd * hcd)31 irqreturn_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
process_dn_buf(struct whc * whc)67 static 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
whc_dn_work(struct work_struct * work)85 void 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