linux-imx

/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */

/*

 * Copyright 2015-2016 Freescale Semiconductor, Inc.

 * Copyright 2017 NXP

 */

​

#ifndef _SG_SW_QM2_H_

#define _SG_SW_QM2_H_

​

#include <soc/fsl/dpaa2-fd.h>

​

static inline void dma_to_qm_sg_one(struct dpaa2_sg_entry *qm_sg_ptr,

                    dma_addr_t dma, u32 len, u16 offset)

{

    dpaa2_sg_set_addr(qm_sg_ptr, dma);

    dpaa2_sg_set_format(qm_sg_ptr, dpaa2_sg_single);

    dpaa2_sg_set_final(qm_sg_ptr, false);

    dpaa2_sg_set_len(qm_sg_ptr, len);

    dpaa2_sg_set_bpid(qm_sg_ptr, 0);

    dpaa2_sg_set_offset(qm_sg_ptr, offset);

}

​

/*

 * convert scatterlist to h/w link table format

 * but does not have final bit; instead, returns last entry

 */

static inline struct dpaa2_sg_entry *

sg_to_qm_sg(struct scatterlist *sg, int sg_count,

        struct dpaa2_sg_entry *qm_sg_ptr, u16 offset)

{

    while (sg_count && sg) {

        dma_to_qm_sg_one(qm_sg_ptr, sg_dma_address(sg),

                 sg_dma_len(sg), offset);

        qm_sg_ptr++;

        sg = sg_next(sg);

        sg_count--;

    }

    return qm_sg_ptr - 1;

}

​

/*

 * convert scatterlist to h/w link table format

 * scatterlist must have been previously dma mapped

 */

static inline void sg_to_qm_sg_last(struct scatterlist *sg, int sg_count,

                    struct dpaa2_sg_entry *qm_sg_ptr,

                    u16 offset)

{

    qm_sg_ptr = sg_to_qm_sg(sg, sg_count, qm_sg_ptr, offset);

    dpaa2_sg_set_final(qm_sg_ptr, true);

}

​

#endif /* _SG_SW_QM2_H_ */