include/buffer.h

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#ifndef BUFFER_H_INCLUDED
#define BUFFER_H_INCLUDED

#include <dma.h>
#include <slist.h>
#include <types.h>

struct buffer {
        void                    *dma_desc;
        dma_addr_t              addr;
        size_t                  len;
        struct slist_node       node;
};

static inline void buffer_init_tx(struct buffer *buf,
                const void *data, size_t len)
{
        buf->addr = dma_map_single(data, len, DMA_TO_DEVICE);
        buf->len = len;
}

static inline void buffer_init_tx_mapped(struct buffer *buf,
                dma_addr_t addr, size_t len)
{
        buf->addr = addr;
        buf->len = len;
}

static inline void buffer_init_rx(struct buffer *buf, void *data, size_t len)
{
        buf->addr = dma_map_single(data, len, DMA_FROM_DEVICE);
        buf->len = len;
}

static inline void buffer_init_rx_mapped(struct buffer *buf,
                dma_addr_t addr, size_t len)
{
        buf->addr = addr;
        buf->len = len;
}

extern struct buffer *buffer_alloc(void);
extern void buffer_free(struct buffer *buf);
extern void buffer_resize(struct buffer *buf, size_t new_size);

extern struct buffer *buffer_dma_alloc(size_t size);
extern void buffer_dma_free(struct buffer *buf, size_t size);

extern void buffer_pool_init(void);


#define buf_list_entry(slnode)                                  \
        slist_entry(slnode, struct buffer, node)

#define buf_list_peek_head(list)                                \
        slist_peek_head(list, struct buffer, node)

#define buf_list_peek_tail(list)                                \
        slist_peek_tail(list, struct buffer, node)

#define buf_list_peek_next(buf)                                 \
        slist_peek_next(&(buf)->node, struct buffer, node)

#define buf_list_pop_head(list)                                 \
        slist_pop_head(list, struct buffer, node)



#endif /* BUFFER_H_INCLUDED */

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