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 24static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream, 25 const struct uwb_mas_bm *mas) 26{ 27 if (mas == NULL) 28 mas = &uwb_mas_bm_zero; 29 return wusbhc->bwa_set(wusbhc, stream, mas); 30} 31 32static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv) 33{ 34 struct wusbhc *wusbhc = rsv->pal_priv; 35 struct device *dev = wusbhc->dev; 36 struct uwb_mas_bm mas; 37 char buf[72]; 38 39 switch (rsv->state) { 40 case UWB_RSV_STATE_O_ESTABLISHED: 41 uwb_rsv_get_usable_mas(rsv, &mas); 42 bitmap_scnprintf(buf, sizeof(buf), mas.bm, UWB_NUM_MAS); 43 dev_dbg(dev, "established reservation: %s\n", buf); 44 wusbhc_bwa_set(wusbhc, rsv->stream, &mas); 45 break; 46 case UWB_RSV_STATE_NONE: 47 dev_dbg(dev, "removed reservation\n"); 48 wusbhc_bwa_set(wusbhc, 0, NULL); 49 break; 50 default: 51 dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state); 52 break; 53 } 54} 55 56 57/** 58 * wusbhc_rsv_establish - establish a reservation for the cluster 59 * @wusbhc: the WUSB HC requesting a bandwith reservation 60 */ 61int wusbhc_rsv_establish(struct wusbhc *wusbhc) 62{ 63 struct uwb_rc *rc = wusbhc->uwb_rc; 64 struct uwb_rsv *rsv; 65 struct uwb_dev_addr bcid; 66 int ret; 67 68 rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc); 69 if (rsv == NULL) 70 return -ENOMEM; 71 72 bcid.data[0] = wusbhc->cluster_id; 73 bcid.data[1] = 0; 74 75 rsv->target.type = UWB_RSV_TARGET_DEVADDR; 76 rsv->target.devaddr = bcid; 77 rsv->type = UWB_DRP_TYPE_PRIVATE; 78 rsv->max_mas = 256; /* try to get as much as possible */ 79 rsv->min_mas = 15; /* one MAS per zone */ 80 rsv->max_interval = 1; /* max latency is one zone */ 81 rsv->is_multicast = true; 82 83 ret = uwb_rsv_establish(rsv); 84 if (ret == 0) 85 wusbhc->rsv = rsv; 86 else 87 uwb_rsv_destroy(rsv); 88 return ret; 89} 90 91 92/** 93 * wusbhc_rsv_terminate - terminate the cluster reservation 94 * @wusbhc: the WUSB host whose reservation is to be terminated 95 */ 96void wusbhc_rsv_terminate(struct wusbhc *wusbhc) 97{ 98 if (wusbhc->rsv) { 99 uwb_rsv_terminate(wusbhc->rsv); 100 uwb_rsv_destroy(wusbhc->rsv); 101 wusbhc->rsv = NULL; 102 } 103} 104