111 lines
2.6 KiB
C
Executable file
111 lines
2.6 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* WUSB cluster reservation management
|
|
*
|
|
* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/uwb.h>
|
|
|
|
#include "wusbhc.h"
|
|
|
|
/*
|
|
* WUSB cluster reservations are multicast reservations with the
|
|
* broadcast cluster ID (BCID) as the target DevAddr.
|
|
*
|
|
* FIXME: consider adjusting the reservation depending on what devices
|
|
* are attached.
|
|
*/
|
|
|
|
static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream,
|
|
const struct uwb_mas_bm *mas)
|
|
{
|
|
if (mas == NULL)
|
|
mas = &uwb_mas_bm_zero;
|
|
return wusbhc->bwa_set(wusbhc, stream, mas);
|
|
}
|
|
|
|
/**
|
|
* wusbhc_rsv_complete_cb - WUSB HC reservation complete callback
|
|
* @rsv: the reservation
|
|
*
|
|
* Either set or clear the HC's view of the reservation.
|
|
*
|
|
* FIXME: when a reservation is denied the HC should be stopped.
|
|
*/
|
|
static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv)
|
|
{
|
|
struct wusbhc *wusbhc = rsv->pal_priv;
|
|
struct device *dev = wusbhc->dev;
|
|
struct uwb_mas_bm mas;
|
|
|
|
dev_dbg(dev, "%s: state = %d\n", __func__, rsv->state);
|
|
switch (rsv->state) {
|
|
case UWB_RSV_STATE_O_ESTABLISHED:
|
|
uwb_rsv_get_usable_mas(rsv, &mas);
|
|
dev_dbg(dev, "established reservation: %*pb\n",
|
|
UWB_NUM_MAS, mas.bm);
|
|
wusbhc_bwa_set(wusbhc, rsv->stream, &mas);
|
|
break;
|
|
case UWB_RSV_STATE_NONE:
|
|
dev_dbg(dev, "removed reservation\n");
|
|
wusbhc_bwa_set(wusbhc, 0, NULL);
|
|
break;
|
|
default:
|
|
dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* wusbhc_rsv_establish - establish a reservation for the cluster
|
|
* @wusbhc: the WUSB HC requesting a bandwidth reservation
|
|
*/
|
|
int wusbhc_rsv_establish(struct wusbhc *wusbhc)
|
|
{
|
|
struct uwb_rc *rc = wusbhc->uwb_rc;
|
|
struct uwb_rsv *rsv;
|
|
struct uwb_dev_addr bcid;
|
|
int ret;
|
|
|
|
if (rc == NULL)
|
|
return -ENODEV;
|
|
|
|
rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc);
|
|
if (rsv == NULL)
|
|
return -ENOMEM;
|
|
|
|
bcid.data[0] = wusbhc->cluster_id;
|
|
bcid.data[1] = 0;
|
|
|
|
rsv->target.type = UWB_RSV_TARGET_DEVADDR;
|
|
rsv->target.devaddr = bcid;
|
|
rsv->type = UWB_DRP_TYPE_PRIVATE;
|
|
rsv->max_mas = 256; /* try to get as much as possible */
|
|
rsv->min_mas = 15; /* one MAS per zone */
|
|
rsv->max_interval = 1; /* max latency is one zone */
|
|
rsv->is_multicast = true;
|
|
|
|
ret = uwb_rsv_establish(rsv);
|
|
if (ret == 0)
|
|
wusbhc->rsv = rsv;
|
|
else
|
|
uwb_rsv_destroy(rsv);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* wusbhc_rsv_terminate - terminate the cluster reservation
|
|
* @wusbhc: the WUSB host whose reservation is to be terminated
|
|
*/
|
|
void wusbhc_rsv_terminate(struct wusbhc *wusbhc)
|
|
{
|
|
if (wusbhc->rsv) {
|
|
uwb_rsv_terminate(wusbhc->rsv);
|
|
uwb_rsv_destroy(wusbhc->rsv);
|
|
wusbhc->rsv = NULL;
|
|
}
|
|
}
|