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/*
* chnl.h
*
* 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 driver.
*
* See DSP API chnl.h for more details.
*
* 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.
*/
#ifndef CHNL_
#define CHNL_
#include <dspbridge/chnlpriv.h>
/*
* ======== chnl_close ========
* Purpose:
* Ensures all pending I/O on this channel is cancelled, discards all
* queued I/O completion notifications, then frees the resources allocated
* for this channel, and makes the corresponding logical channel id
* available for subsequent use.
* Parameters:
* chnl_obj: Channel object handle.
* Returns:
* 0: Success;
* -EFAULT: Invalid chnl_obj.
* Requires:
* chnl_init(void) called.
* No thread must be blocked on this channel's I/O completion event.
* Ensures:
* 0: The I/O completion event for this channel is freed.
* chnl_obj is no longer valid.
*/
extern int chnl_close(struct chnl_object *chnl_obj);
/*
* ======== chnl_create ========
* Purpose:
* Create a channel manager object, responsible for opening new channels
* and closing old ones for a given board.
* Parameters:
* channel_mgr: Location to store a channel manager object on output.
* hdev_obj: Handle to a device object.
* mgr_attrts: Channel manager attributes.
* mgr_attrts->max_channels: Max channels
* mgr_attrts->birq: Channel's I/O IRQ number.
* mgr_attrts->irq_shared: TRUE if the IRQ is shareable.
* mgr_attrts->word_size: DSP Word size in equivalent PC bytes..
* Returns:
* 0: Success;
* -EFAULT: hdev_obj is invalid.
* -EINVAL: max_channels is 0.
* Invalid DSP word size (must be > 0).
* Invalid base address for DSP communications.
* -ENOMEM: Insufficient memory for requested resources.
* -EIO: Unable to plug channel ISR for configured IRQ.
* -ECHRNG: This manager cannot handle this many channels.
* -EEXIST: Channel manager already exists for this device.
* Requires:
* chnl_init(void) called.
* channel_mgr != NULL.
* mgr_attrts != NULL.
* Ensures:
* 0: Subsequent calls to chnl_create() for the same
* board without an intervening call to
* chnl_destroy() will fail.
*/
extern int chnl_create(struct chnl_mgr **channel_mgr,
struct dev_object *hdev_obj,
const struct chnl_mgrattrs *mgr_attrts);
/*
* ======== chnl_destroy ========
* Purpose:
* Close all open channels, and destroy the channel manager.
* Parameters:
* hchnl_mgr: Channel manager object.
* Returns:
* 0: Success.
* -EFAULT: hchnl_mgr was invalid.
* Requires:
* chnl_init(void) called.
* Ensures:
* 0: Cancels I/O on each open channel.
* Closes each open channel.
* chnl_create may subsequently be called for the
* same board.
*/
extern int chnl_destroy(struct chnl_mgr *hchnl_mgr);
/*
* ======== chnl_exit ========
* Purpose:
* Discontinue usage of the CHNL module.
* Parameters:
* Returns:
* Requires:
* chnl_init(void) previously called.
* Ensures:
* Resources, if any acquired in chnl_init(void), are freed when the last
* client of CHNL calls chnl_exit(void).
*/
extern void chnl_exit(void);
/*
* ======== chnl_init ========
* Purpose:
* Initialize the CHNL module's private state.
* Parameters:
* Returns:
* TRUE if initialized; FALSE if error occurred.
* Requires:
* Ensures:
* A requirement for each of the other public CHNL functions.
*/
extern bool chnl_init(void);
#endif /* CHNL_ */
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