107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/* $NetBSD: drm_pci.c,v 1.14 2009/03/29 19:39:10 mrg Exp $ */
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/*
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* Copyright 2003 Eric Anholt.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: drm_pci.c,v 1.14 2009/03/29 19:39:10 mrg Exp $");
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/*
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__FBSDID("$FreeBSD: src/sys/dev/drm/drm_pci.c,v 1.2 2005/11/28 23:13:52 anholt Exp $");
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*/
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#include "drmP.h"
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drm_dma_handle_t *
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drm_pci_alloc(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr)
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{
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drm_dma_handle_t *h;
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int error, nsegs;
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/* Need power-of-two alignment, so fail the allocation if it isn't. */
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if ((align & (align - 1)) != 0) {
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DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
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(int)align);
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return NULL;
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}
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h = malloc(sizeof(drm_dma_handle_t), M_DRM, M_ZERO | M_NOWAIT);
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if (h == NULL)
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return NULL;
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if ((error = bus_dmamem_alloc(dev->pa.pa_dmat, size, align, 0,
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h->segs, 1, &nsegs, BUS_DMA_NOWAIT)) != 0) {
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printf("drm: Unable to allocate %ld bytes of DMA, error %d\n",
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(long)size, error);
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goto fail;
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}
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if ((error = bus_dmamem_map(dev->pa.pa_dmat, h->segs, nsegs, size,
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&h->addr, BUS_DMA_NOWAIT | BUS_DMA_COHERENT)) != 0) {
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printf("drm: Unable to map DMA, error %d\n", error);
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goto free;
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}
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if ((error = bus_dmamap_create(dev->pa.pa_dmat, size, 1, size, 0,
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BUS_DMA_NOWAIT | BUS_DMA_ALLOCNOW, &h->map)) != 0) {
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printf("drm: Unable to create DMA map, error %d\n", error);
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goto unmap;
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}
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if ((error = bus_dmamap_load(dev->pa.pa_dmat, h->map, h->addr, size,
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NULL, BUS_DMA_NOWAIT)) != 0) {
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printf("drm: Unable to load DMA map, error %d\n", error);
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goto destroy;
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}
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h->busaddr = DRM_PCI_DMAADDR(h);
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h->vaddr = h->addr;
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h->size = size;
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return h;
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destroy:
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bus_dmamap_destroy(dev->pa.pa_dmat, h->map);
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unmap:
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bus_dmamem_unmap(dev->pa.pa_dmat, h->addr, size);
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free:
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bus_dmamem_free(dev->pa.pa_dmat, h->segs, 1);
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fail:
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free(h, M_DRM);
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return NULL;
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}
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/*
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* Free a DMA-accessible consistent memory block.
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*/
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void
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drm_pci_free(drm_device_t *dev, drm_dma_handle_t *h)
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{
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if (h == NULL)
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return;
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bus_dmamap_unload(dev->pa.pa_dmat, h->map);
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bus_dmamap_destroy(dev->pa.pa_dmat, h->map);
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bus_dmamem_unmap(dev->pa.pa_dmat, h->addr, h->size);
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bus_dmamem_free(dev->pa.pa_dmat, h->segs, 1);
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free(h, M_DRM);
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}
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