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