2 * WUSB cluster reservation management
4 * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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.
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.
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/>.
18 #include <linux/kernel.h>
19 #include <linux/uwb.h>
24 * WUSB cluster reservations are multicast reservations with the
25 * broadcast cluster ID (BCID) as the target DevAddr.
27 * FIXME: consider adjusting the reservation depending on what devices
31 static int wusbhc_bwa_set(struct wusbhc
*wusbhc
, u8 stream
,
32 const struct uwb_mas_bm
*mas
)
35 mas
= &uwb_mas_bm_zero
;
36 return wusbhc
->bwa_set(wusbhc
, stream
, mas
);
40 * wusbhc_rsv_complete_cb - WUSB HC reservation complete callback
41 * @rsv: the reservation
43 * Either set or clear the HC's view of the reservation.
45 * FIXME: when a reservation is denied the HC should be stopped.
47 static void wusbhc_rsv_complete_cb(struct uwb_rsv
*rsv
)
49 struct wusbhc
*wusbhc
= rsv
->pal_priv
;
50 struct device
*dev
= wusbhc
->dev
;
51 struct uwb_mas_bm mas
;
55 case UWB_RSV_STATE_O_ESTABLISHED
:
56 uwb_rsv_get_usable_mas(rsv
, &mas
);
57 bitmap_scnprintf(buf
, sizeof(buf
), mas
.bm
, UWB_NUM_MAS
);
58 dev_dbg(dev
, "established reservation: %s\n", buf
);
59 wusbhc_bwa_set(wusbhc
, rsv
->stream
, &mas
);
61 case UWB_RSV_STATE_NONE
:
62 dev_dbg(dev
, "removed reservation\n");
63 wusbhc_bwa_set(wusbhc
, 0, NULL
);
66 dev_dbg(dev
, "unexpected reservation state: %d\n", rsv
->state
);
73 * wusbhc_rsv_establish - establish a reservation for the cluster
74 * @wusbhc: the WUSB HC requesting a bandwidth reservation
76 int wusbhc_rsv_establish(struct wusbhc
*wusbhc
)
78 struct uwb_rc
*rc
= wusbhc
->uwb_rc
;
80 struct uwb_dev_addr bcid
;
86 rsv
= uwb_rsv_create(rc
, wusbhc_rsv_complete_cb
, wusbhc
);
90 bcid
.data
[0] = wusbhc
->cluster_id
;
93 rsv
->target
.type
= UWB_RSV_TARGET_DEVADDR
;
94 rsv
->target
.devaddr
= bcid
;
95 rsv
->type
= UWB_DRP_TYPE_PRIVATE
;
96 rsv
->max_mas
= 256; /* try to get as much as possible */
97 rsv
->min_mas
= 15; /* one MAS per zone */
98 rsv
->max_interval
= 1; /* max latency is one zone */
99 rsv
->is_multicast
= true;
101 ret
= uwb_rsv_establish(rsv
);
105 uwb_rsv_destroy(rsv
);
111 * wusbhc_rsv_terminate - terminate the cluster reservation
112 * @wusbhc: the WUSB host whose reservation is to be terminated
114 void wusbhc_rsv_terminate(struct wusbhc
*wusbhc
)
117 uwb_rsv_terminate(wusbhc
->rsv
);
118 uwb_rsv_destroy(wusbhc
->rsv
);