include/buffer.h

Go to the documentation of this file.

#ifndef BUFFER_H_INCLUDED
#define BUFFER_H_INCLUDED

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

struct buffer {
        void                    *dma_desc;
        buffer_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.ptr = (void *)data;
        buf->addr.phys = dma_map_single(buf->addr.ptr, len, DMA_TO_DEVICE);
        buf->len = len;
}

static inline void buffer_init_tx_mapped(struct buffer *buf,
                const void *data, phys_addr_t phys, size_t len)
{
        buf->addr.ptr = (void *)data;
        buf->addr.phys = phys;
        buf->len = len;
}

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

static inline void buffer_init_rx_mapped(struct buffer *buf,
                void *data, phys_addr_t phys, size_t len)
{
        buf->addr.ptr = data;
        buf->addr.phys = phys;
        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);

#endif /* BUFFER_H_INCLUDED */

---