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/**
* \file drm_pci.h
* \brief PCI consistent, DMA-accessible memory functions.
*
* \author Eric Anholt <anholt@FreeBSD.org>
*/
/*-
* Copyright 2003 Eric Anholt.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "drmP.h"
/**********************************************************************/
/** \name PCI memory */
/*@{*/
#if defined(__FreeBSD__)
static void
drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
drm_dma_handle_t *dmah = arg;
if (error != 0)
return;
KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
dmah->busaddr = segs[0].ds_addr;
}
#endif
/**
* \brief Allocate a physically contiguous DMA-accessible consistent
* memory block.
*/
drm_dma_handle_t *
drm_pci_alloc(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr)
{
drm_dma_handle_t *dmah;
int ret;
dmah = malloc(sizeof(drm_dma_handle_t), M_DRM, M_ZERO | M_NOWAIT);
if (dmah == NULL)
return NULL;
#ifdef __FreeBSD__
ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */
maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
NULL, NULL, /* filtfunc, filtfuncargs */
size, 1, size, /* maxsize, nsegs, maxsegsize */
BUS_DMA_ALLOCNOW, NULL, NULL, /* flags, lockfunc, lockfuncargs */
&dmah->tag);
if (ret != 0) {
free(dmah, M_DRM);
return NULL;
}
ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, BUS_DMA_NOWAIT,
&dmah->map);
if (ret != 0) {
bus_dma_tag_destroy(dmah->tag);
free(dmah, M_DRM);
return NULL;
}
ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
drm_pci_busdma_callback, dmah, 0);
if (ret != 0) {
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
free(dmah, M_DRM);
return NULL;
}
#elif defined(__NetBSD__)
ret = bus_dmamem_alloc(dev->dma_tag, size, align, PAGE_SIZE,
&dmah->seg, 1, &nsegs, BUS_DMA_NOWAIT);
if ((ret != 0) || (nsegs != 1)) {
free(dmah, M_DRM);
return NULL;
}
ret = bus_dmamem_map(dev->dma_tag, &dmah->seg, 1, size, &dmah->addr,
BUS_DMA_NOWAIT);
if (ret != 0) {
bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);
free(dmah, M_DRM);
return NULL;
}
dmah->dmaaddr = h->seg.ds_addr;
#endif
return dmah;
}
/**
* \brief Free a DMA-accessible consistent memory block.
*/
void
drm_pci_free(drm_device_t *dev, drm_dma_handle_t *dmah)
{
if (dmah == NULL)
return;
#if defined(__FreeBSD__)
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
#elif defined(__NetBSD__)
bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);
#endif
free(dmah, M_DRM);
}
/*@}*/
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