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
transfer_done(struct whc * whc)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
whc_int_handler(struct usb_hcd * hcd)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
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
process_dn_buf(struct whc * whc)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);
79 dn->status &= ~WHC_DN_STATUS_VALID;
80 processed++;
81 }
82 }
83 return processed;
84 }
85
whc_dn_work(struct work_struct * work)86 void 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