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/*
* chnl.c
*
* DSP-BIOS Bridge driver support functions for TI OMAP processors.
*
* DSP API channel interface: multiplexes data streams through the single
* physical link managed by a Bridge Bridge driver.
*
* Copyright (C) 2005-2006 Texas Instruments, Inc.
*
* This package is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <linux/types.h>
/* ----------------------------------- Host OS */
#include <dspbridge/host_os.h>
/* ----------------------------------- DSP/BIOS Bridge */
#include <dspbridge/dbdefs.h>
/* ----------------------------------- Trace & Debug */
#include <dspbridge/dbc.h>
/* ----------------------------------- OS Adaptation Layer */
#include <dspbridge/cfg.h>
#include <dspbridge/sync.h>
/* ----------------------------------- Platform Manager */
#include <dspbridge/proc.h>
#include <dspbridge/dev.h>
/* ----------------------------------- Others */
#include <dspbridge/chnlpriv.h>
#include <chnlobj.h>
/* ----------------------------------- This */
#include <dspbridge/chnl.h>
/* ----------------------------------- Globals */
static u32 refs;
/*
* ======== chnl_create ========
* Purpose:
* Create a channel manager object, responsible for opening new channels
* and closing old ones for a given 'Bridge board.
*/
int chnl_create(struct chnl_mgr **channel_mgr,
struct dev_object *hdev_obj,
const struct chnl_mgrattrs *mgr_attrts)
{
int status;
struct chnl_mgr *hchnl_mgr;
struct chnl_mgr_ *chnl_mgr_obj = NULL;
DBC_REQUIRE(refs > 0);
DBC_REQUIRE(channel_mgr != NULL);
DBC_REQUIRE(mgr_attrts != NULL);
*channel_mgr = NULL;
/* Validate args: */
if ((0 < mgr_attrts->max_channels) &&
(mgr_attrts->max_channels <= CHNL_MAXCHANNELS))
status = 0;
else if (mgr_attrts->max_channels == 0)
status = -EINVAL;
else
status = -ECHRNG;
if (mgr_attrts->word_size == 0)
status = -EINVAL;
if (!status) {
status = dev_get_chnl_mgr(hdev_obj, &hchnl_mgr);
if (!status && hchnl_mgr != NULL)
status = -EEXIST;
}
if (!status) {
struct bridge_drv_interface *intf_fxns;
dev_get_intf_fxns(hdev_obj, &intf_fxns);
/* Let Bridge channel module finish the create: */
status = (*intf_fxns->pfn_chnl_create) (&hchnl_mgr, hdev_obj,
mgr_attrts);
if (!status) {
/* Fill in DSP API channel module's fields of the
* chnl_mgr structure */
chnl_mgr_obj = (struct chnl_mgr_ *)hchnl_mgr;
chnl_mgr_obj->intf_fxns = intf_fxns;
/* Finally, return the new channel manager handle: */
*channel_mgr = hchnl_mgr;
}
}
DBC_ENSURE(status || chnl_mgr_obj);
return status;
}
/*
* ======== chnl_destroy ========
* Purpose:
* Close all open channels, and destroy the channel manager.
*/
int chnl_destroy(struct chnl_mgr *hchnl_mgr)
{
struct chnl_mgr_ *chnl_mgr_obj = (struct chnl_mgr_ *)hchnl_mgr;
struct bridge_drv_interface *intf_fxns;
int status;
DBC_REQUIRE(refs > 0);
if (chnl_mgr_obj) {
intf_fxns = chnl_mgr_obj->intf_fxns;
/* Let Bridge channel module destroy the chnl_mgr: */
status = (*intf_fxns->pfn_chnl_destroy) (hchnl_mgr);
} else {
status = -EFAULT;
}
return status;
}
/*
* ======== chnl_exit ========
* Purpose:
* Discontinue usage of the CHNL module.
*/
void chnl_exit(void)
{
DBC_REQUIRE(refs > 0);
refs--;
DBC_ENSURE(refs >= 0);
}
/*
* ======== chnl_init ========
* Purpose:
* Initialize the CHNL module's private state.
*/
bool chnl_init(void)
{
bool ret = true;
DBC_REQUIRE(refs >= 0);
if (ret)
refs++;
DBC_ENSURE((ret && (refs > 0)) || (!ret && (refs >= 0)));
return ret;
}
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