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/*
* io.c
*
* DSP-BIOS Bridge driver support functions for TI OMAP processors.
*
* IO manager interface: Manages IO between CHNL and msg_ctrl.
*
* 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>
/* ----------------------------------- Platform Manager */
#include <dspbridge/dev.h>
/* ----------------------------------- This */
#include <ioobj.h>
#include <dspbridge/iodefs.h>
#include <dspbridge/io.h>
/* ----------------------------------- Globals */
static u32 refs;
/*
* ======== io_create ========
* Purpose:
* Create an IO manager object, responsible for managing IO between
* CHNL and msg_ctrl
*/
int io_create(struct io_mgr **io_man, struct dev_object *hdev_obj,
const struct io_attrs *mgr_attrts)
{
struct bridge_drv_interface *intf_fxns;
struct io_mgr *hio_mgr = NULL;
struct io_mgr_ *pio_mgr = NULL;
int status = 0;
DBC_REQUIRE(refs > 0);
DBC_REQUIRE(io_man != NULL);
DBC_REQUIRE(mgr_attrts != NULL);
*io_man = NULL;
/* A memory base of 0 implies no memory base: */
if ((mgr_attrts->shm_base != 0) && (mgr_attrts->usm_length == 0))
status = -EINVAL;
if (mgr_attrts->word_size == 0)
status = -EINVAL;
if (!status) {
dev_get_intf_fxns(hdev_obj, &intf_fxns);
/* Let Bridge channel module finish the create: */
status = (*intf_fxns->pfn_io_create) (&hio_mgr, hdev_obj,
mgr_attrts);
if (!status) {
pio_mgr = (struct io_mgr_ *)hio_mgr;
pio_mgr->intf_fxns = intf_fxns;
pio_mgr->hdev_obj = hdev_obj;
/* Return the new channel manager handle: */
*io_man = hio_mgr;
}
}
return status;
}
/*
* ======== io_destroy ========
* Purpose:
* Delete IO manager.
*/
int io_destroy(struct io_mgr *hio_mgr)
{
struct bridge_drv_interface *intf_fxns;
struct io_mgr_ *pio_mgr = (struct io_mgr_ *)hio_mgr;
int status;
DBC_REQUIRE(refs > 0);
intf_fxns = pio_mgr->intf_fxns;
/* Let Bridge channel module destroy the io_mgr: */
status = (*intf_fxns->pfn_io_destroy) (hio_mgr);
return status;
}
/*
* ======== io_exit ========
* Purpose:
* Discontinue usage of the IO module.
*/
void io_exit(void)
{
DBC_REQUIRE(refs > 0);
refs--;
DBC_ENSURE(refs >= 0);
}
/*
* ======== io_init ========
* Purpose:
* Initialize the IO module's private state.
*/
bool io_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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