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/**************************************************************************
*
* Copyright (c) 2012 James Simmons <jsimmons@infradead.org>
* 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, sub license, 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 NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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 "openchrome_drv.h"
static int
via_pcie_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
{
struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm;
struct via_device *dev_priv =
container_of(ttm->bdev, struct via_device, ttm.bdev);
int i;
/* Disable gart table HW protect */
svga_wseq_mask(VGABASE, 0x6C, 0x00, BIT(7));
/* Update the relevant entries */
dma_tt->offset = mem->start << PAGE_SHIFT;
for (i = 0; i < ttm->num_pages; i++) {
writel(page_to_pfn(ttm->pages[i]) & 0x3FFFFFFF,
dev_priv->gart.virtual + dma_tt->offset + i);
}
/* Invalided GTI cache */
svga_wseq_mask(VGABASE, 0x6F, BIT(7), BIT(7));
/* Enable gart table HW protect */
svga_wseq_mask(VGABASE, 0x6C, BIT(7), BIT(7));
return 1;
}
static int
via_pcie_sgdma_unbind(struct ttm_tt *ttm)
{
struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm;
struct via_device *dev_priv =
container_of(ttm->bdev, struct via_device, ttm.bdev);
int i;
if (ttm->state != tt_bound)
return 0;
/* Disable gart table HW protect */
svga_wseq_mask(VGABASE, 0x6C, 0x00, BIT(7));
/* Update the relevant entries */
for (i = 0; i < ttm->num_pages; i++)
writel(0x80000000, dev_priv->gart.virtual + dma_tt->offset + i);
dma_tt->offset = 0;
/* Invalided GTI cache */
svga_wseq_mask(VGABASE, 0x6F, BIT(7), BIT(7));
/* Enable gart table HW protect */
svga_wseq_mask(VGABASE, 0x6C, BIT(7), BIT(7));
return 0;
}
static void
via_sgdma_destroy(struct ttm_tt *ttm)
{
struct sgdma_tt *dma_tt = (struct sgdma_tt *) ttm;
if (ttm) {
ttm_dma_tt_fini(&dma_tt->sgdma);
kfree(dma_tt);
}
}
static struct ttm_backend_func ttm_sgdma_func = {
.bind = via_pcie_sgdma_bind,
.unbind = via_pcie_sgdma_unbind,
.destroy = via_sgdma_destroy,
};
struct ttm_tt* via_sgdma_backend_init(struct ttm_buffer_object *bo,
uint32_t page_flags)
{
struct sgdma_tt *dma_tt;
dma_tt = kzalloc(sizeof(*dma_tt), GFP_KERNEL);
if (!dma_tt)
return NULL;
dma_tt->sgdma.ttm.func = &ttm_sgdma_func;
if (ttm_dma_tt_init(&dma_tt->sgdma, bo, page_flags)) {
kfree(dma_tt);
return NULL;
}
return &dma_tt->sgdma.ttm;
}
EXPORT_SYMBOL(via_sgdma_backend_init);
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