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#ifndef _PCILIB_DMA_H
#define _PCILIB_DMA_H
#include <pcilib.h>
#include <pcilib/bank.h>
#include <pcilib/register.h>
#define PCILIB_DMA_BUFFER_INVALID ((size_t)-1)
typedef struct {
int used; /**< Indicates if buffer has unread data or empty and ready for DMA */
int error; /**< Indicates if data is complete and correctly transfered or some error occured during the DMA transfer */
int first; /**< Indicates the first buffer of the packet */
int last; /**< Indicates the last buffer of the packet */
size_t size; /**< Indicates number of bytes actually written to the buffer */
} pcilib_dma_buffer_status_t;
typedef struct {
int started; /**< Informs if the engine is currently started or not */
size_t ring_size, buffer_size; /**< The number of allocated DMA buffers and size of each buffer in bytes */
size_t ring_head, ring_tail; /**< The first and the last buffer containing the data */
size_t written_buffers, written_bytes; /**< Number of pending buffers and total number of written bytes */
} pcilib_dma_engine_status_t;
typedef enum {
PCILIB_DMA_TYPE_BLOCK, /**< Simple DMA engine */
PCILIB_DMA_TYPE_PACKET, /**< Streaming (scatter-gather) DMA engine */
PCILIB_DMA_TYPE_UNKNOWN
} pcilib_dma_engine_type_t;
typedef struct {
pcilib_dma_engine_addr_t addr; /**< Address of DMA engine (from 0) */
pcilib_dma_engine_type_t type; /**< Type of DMA engine */
pcilib_dma_direction_t direction; /**< Defines which kind of transfer does engine support: C2S, S2C, or both */
size_t addr_bits; /**< Number of addressable bits in the system memory (we currently work with 32-bits only) */
const char *name; /**< Defines a short name of engine (its main use, i.e. main, auxilliary, etc.) */
const char *description; /**< Defines a longer description of the engine */
} pcilib_dma_engine_description_t;
/*
typedef struct {
int ignore_eop;
} pcilib_dma_parameters_t;
*/
typedef struct {
// pcilib_dma_parameters_t params;
pcilib_t *pcilib; /**< Reference to the pcilib context */
} pcilib_dma_context_t;
typedef struct {
pcilib_version_t version;
pcilib_dma_context_t *(*init)(pcilib_t *ctx, const char *model, const void *arg);
void (*free)(pcilib_dma_context_t *ctx);
int (*status)(pcilib_dma_context_t *ctx, pcilib_dma_engine_t dma, pcilib_dma_engine_status_t *status, size_t n_buffers, pcilib_dma_buffer_status_t *buffers);
int (*enable_irq)(pcilib_dma_context_t *ctx, pcilib_irq_type_t irq_type, pcilib_dma_flags_t flags);
int (*disable_irq)(pcilib_dma_context_t *ctx, pcilib_dma_flags_t flags);
int (*acknowledge_irq)(pcilib_dma_context_t *ctx, pcilib_irq_type_t irq_type, pcilib_irq_source_t irq_source);
int (*start_dma)(pcilib_dma_context_t *ctx, pcilib_dma_engine_t dma, pcilib_dma_flags_t flags);
int (*stop_dma)(pcilib_dma_context_t *ctx, pcilib_dma_engine_t dma, pcilib_dma_flags_t flags);
int (*push)(pcilib_dma_context_t *ctx, pcilib_dma_engine_t dma, uintptr_t addr, size_t size, pcilib_dma_flags_t flags, pcilib_timeout_t timeout, void *buf, size_t *written);
int (*stream)(pcilib_dma_context_t *ctx, pcilib_dma_engine_t dma, uintptr_t addr, size_t size, pcilib_dma_flags_t flags, pcilib_timeout_t timeout, pcilib_dma_callback_t cb, void *cbattr);
double (*benchmark)(pcilib_dma_context_t *ctx, pcilib_dma_engine_addr_t dma, uintptr_t addr, size_t size, size_t iterations, pcilib_dma_direction_t direction);
} pcilib_dma_api_description_t;
typedef struct {
const pcilib_dma_api_description_t *api; /**< Defines all API functions for DMA operation */
const pcilib_register_bank_description_t *banks; /**< Pre-defined register banks exposed by DMA interface, additional banks can be defined during DMA initialization */
const pcilib_register_description_t *registers; /**< Pre-defined registers exposed by DMA interface, additional registers can be defined during DMA initialization */
const pcilib_dma_engine_description_t *engines; /**< List of DMA engines exposed by DMA interface, alternatively engines can be added during DMA initialization */
const char *model; /**< If NULL, the actually used event model is used instead */
const void *args; /**< Custom DMA-specific arguments. The actual structure may depend on the specified model */
const char *name; /**< Short name of DMA interface */
const char *description; /**< A bit longer description of DMA interface */
} pcilib_dma_description_t;
#ifdef __cplusplus
extern "C" {
#endif
const pcilib_dma_description_t *pcilib_get_dma_description(pcilib_t *ctx);
pcilib_dma_engine_t pcilib_add_dma_engine(pcilib_t *ctx, pcilib_dma_engine_description_t *desc);
int pcilib_get_dma_status(pcilib_t *ctx, pcilib_dma_engine_t dma, pcilib_dma_engine_status_t *status, size_t n_buffers, pcilib_dma_buffer_status_t *buffers);
int pcilib_init_dma(pcilib_t *ctx);
#ifdef __cplusplus
}
#endif
#endif /* _PCILIB_DMA_H */
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