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90ff96f2 IPG |
1 | /* |
2 | * WUSB cluster reservation management | |
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.h> | |
20 | ||
21 | #include "wusbhc.h" | |
22 | ||
23 | /* | |
24 | * WUSB cluster reservations are multicast reservations with the | |
25 | * broadcast cluster ID (BCID) as the target DevAddr. | |
26 | * | |
27 | * FIXME: consider adjusting the reservation depending on what devices | |
28 | * are attached. | |
29 | */ | |
30 | ||
31 | static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream, | |
32 | const struct uwb_mas_bm *mas) | |
33 | { | |
34 | if (mas == NULL) | |
35 | mas = &uwb_mas_bm_zero; | |
36 | return wusbhc->bwa_set(wusbhc, stream, mas); | |
37 | } | |
38 | ||
39 | /** | |
40 | * wusbhc_rsv_complete_cb - WUSB HC reservation complete callback | |
41 | * @rsv: the reservation | |
42 | * | |
43 | * Either set or clear the HC's view of the reservation. | |
44 | * | |
45 | * FIXME: when a reservation is denied the HC should be stopped. | |
46 | */ | |
47 | static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv) | |
48 | { | |
49 | struct wusbhc *wusbhc = rsv->pal_priv; | |
50 | struct device *dev = wusbhc->dev; | |
5b37717a | 51 | struct uwb_mas_bm mas; |
90ff96f2 IPG |
52 | char buf[72]; |
53 | ||
54 | switch (rsv->state) { | |
55 | case UWB_RSV_STATE_O_ESTABLISHED: | |
5b37717a SP |
56 | uwb_rsv_get_usable_mas(rsv, &mas); |
57 | bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS); | |
90ff96f2 | 58 | dev_dbg(dev, "established reservation: %s\n", buf); |
5b37717a | 59 | wusbhc_bwa_set(wusbhc, rsv->stream, &mas); |
90ff96f2 IPG |
60 | break; |
61 | case UWB_RSV_STATE_NONE: | |
62 | dev_dbg(dev, "removed reservation\n"); | |
63 | wusbhc_bwa_set(wusbhc, 0, NULL); | |
90ff96f2 IPG |
64 | break; |
65 | default: | |
66 | dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state); | |
67 | break; | |
68 | } | |
69 | } | |
70 | ||
71 | ||
72 | /** | |
73 | * wusbhc_rsv_establish - establish a reservation for the cluster | |
25985edc | 74 | * @wusbhc: the WUSB HC requesting a bandwidth reservation |
90ff96f2 IPG |
75 | */ |
76 | int wusbhc_rsv_establish(struct wusbhc *wusbhc) | |
77 | { | |
78 | struct uwb_rc *rc = wusbhc->uwb_rc; | |
79 | struct uwb_rsv *rsv; | |
80 | struct uwb_dev_addr bcid; | |
81 | int ret; | |
82 | ||
83 | rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc); | |
84 | if (rsv == NULL) | |
85 | return -ENOMEM; | |
86 | ||
87 | bcid.data[0] = wusbhc->cluster_id; | |
88 | bcid.data[1] = 0; | |
89 | ||
90ff96f2 IPG |
90 | rsv->target.type = UWB_RSV_TARGET_DEVADDR; |
91 | rsv->target.devaddr = bcid; | |
92 | rsv->type = UWB_DRP_TYPE_PRIVATE; | |
5b37717a SP |
93 | rsv->max_mas = 256; /* try to get as much as possible */ |
94 | rsv->min_mas = 15; /* one MAS per zone */ | |
95 | rsv->max_interval = 1; /* max latency is one zone */ | |
90ff96f2 IPG |
96 | rsv->is_multicast = true; |
97 | ||
98 | ret = uwb_rsv_establish(rsv); | |
99 | if (ret == 0) | |
100 | wusbhc->rsv = rsv; | |
101 | else | |
102 | uwb_rsv_destroy(rsv); | |
103 | return ret; | |
104 | } | |
105 | ||
106 | ||
107 | /** | |
cae1c114 | 108 | * wusbhc_rsv_terminate - terminate the cluster reservation |
90ff96f2 IPG |
109 | * @wusbhc: the WUSB host whose reservation is to be terminated |
110 | */ | |
111 | void wusbhc_rsv_terminate(struct wusbhc *wusbhc) | |
112 | { | |
fe6e87a4 DV |
113 | if (wusbhc->rsv) { |
114 | uwb_rsv_terminate(wusbhc->rsv); | |
115 | uwb_rsv_destroy(wusbhc->rsv); | |
116 | wusbhc->rsv = NULL; | |
117 | } | |
90ff96f2 | 118 | } |