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#ifndef DMA_EXPORT_H
#define DMA_EXPORT_H
/****************************************************
* $Id:
*
* Copyright Motorola 1999
*
* $Log:
*
****************************************************/
/* These are the defined return values for the DMA_* functions.
* Any non-zero value indicates failure. Failure modes can be added for
* more detailed error reporting.
*/
typedef enum _dma_status
{
DMA_SUCCESS = 0,
DMA_ERROR,
} DMA_Status;
/* These are the defined channel transfer types. */
typedef enum _dma_transfer_types
{
DMA_M2M = 0, /* local memory to local memory */
DMA_M2P = 1, /* local memory to PCI */
DMA_P2M = 2, /* PCI to local memory */
DMA_P2P = 3, /* PCI to PCI */
} DMA_TRANSFER_TYPE;
typedef enum _dma_interrupt_steer
{
DMA_INT_STEER_LOCAL = 0, /* steer DMA int to local processor */
DMA_INT_STEER_PCI = 1, /* steer DMA int to PCI bus through INTA_ */
} DMA_INTERRUPT_STEER;
typedef enum _dma_channel
{
DMA_CHN_0 = 0, /* kahlua has two dma channels: 0 and 1 */
DMA_CHN_1 = 1,
} DMA_CHANNEL;
typedef enum _dma_snoop_mode
{
DMA_SNOOP_DISABLE = 0,
DMA_SNOOP_ENABLE = 1,
} DMA_SNOOP_MODE;
/******************** App. API ********************
* The application API is for user level application
* to use the functionality provided by DMA driver.
* This is a "generic" DMA interface, it should contain
* nothing specific to the Kahlua implementation.
* Only the generic functions are exported by the library.
*
* Note: Its App.s responsibility to swap the data
* byte. In our API, we currently transfer whatever
* we are given - Big/Little Endian. This could
* become part of the DMA config, though.
**************************************************/
/* Initialize DMA unit with the following:
* optional pointer to application layer print function
*
* These parameters may be added:
* ???
* Interrupt enables, modes, etc. are set for each transfer.
*
* This function must be called before DMA unit can be used.
*/
extern DMA_Status DMA_Initialize(
int (*app_print_function)(char *,...)); /* pointer to optional "printf"
* provided by application
*/
/* Perform the DMA transfer, only direct mode is currently implemented.
* At this point, I think it would be better to define a different
* function for chaining mode.
* Also, I'm not sure if it is appropriate to have the "generic" API
* accept snoop and int_steer parameters. The DINK user interface allows
* them, so for now I'll leave them.
*
* int_steer controls DMA interrupt steering to PCI or local processor
* type is the type of transfer: M2M, M2P, P2M, P2P
* source is the source address of the data
* dest is the destination address of the data
* len is the length of data to transfer
* channel is the DMA channel to use for the transfer
* snoop is the snoop enable control
*/
extern DMA_Status DMA_direct_transfer( DMA_INTERRUPT_STEER int_steer,
DMA_TRANSFER_TYPE type,
unsigned int source,
unsigned int dest,
unsigned int len,
DMA_CHANNEL channel,
DMA_SNOOP_MODE snoop);
#endif
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