diff options
Diffstat (limited to 'drivers/staging/tidspbridge/include/dspbridge/chnl.h')
| -rw-r--r-- | drivers/staging/tidspbridge/include/dspbridge/chnl.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/drivers/staging/tidspbridge/include/dspbridge/chnl.h b/drivers/staging/tidspbridge/include/dspbridge/chnl.h new file mode 100644 index 000000000000..8733b3b81931 --- /dev/null +++ b/drivers/staging/tidspbridge/include/dspbridge/chnl.h @@ -0,0 +1,130 @@ +/* + * 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 + * chnl_obj is no longer valid.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_ */ |