projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | } |