libethdrivers/src/helpers.c

/*
 * Copyright 2017, Data61
 * Commonwealth Scientific and Industrial Research Organisation (CSIRO)
 * ABN 41 687 119 230.
 *
 * This software may be distributed and modified according to the terms of
 * the GNU General Public License version 2. Note that NO WARRANTY is provided.
 * See "LICENSE_GPLv2.txt" for details.
 *
 * @TAG(DATA61_GPL)
 */

#include <ethdrivers/helpers.h>

dma_addr_t
dma_alloc_pin(ps_dma_man_t *dma_man, size_t size, int cached, int alignment)
{
    void *virt = ps_dma_alloc(dma_man, size, alignment, cached, PS_MEM_NORMAL);
    if (!virt) {
        return (dma_addr_t) {0, 0};
    }
    uintptr_t phys = ps_dma_pin(dma_man, virt, size);
    if (!phys) {
        /* hmm this shouldn't really happen */
        ps_dma_free(dma_man, virt, size);
        return (dma_addr_t) {0, 0};
    }
    if (!cached) {
        /* Prevent any cache bombs */
        ps_dma_cache_clean_invalidate(dma_man, virt, size);
    }
    return (dma_addr_t) {.virt = virt, .phys = phys};
}

void
dma_unpin_free(ps_dma_man_t *dma_man, void *virt, size_t size)
{
    ps_dma_unpin(dma_man, virt, size);
    ps_dma_free(dma_man, virt, size);
}