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/*
* Copyright 2012 Red Hat Inc.
*
* 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 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.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors: Dave Airlie <airlied@redhat.com>
*/
#include <linux/pci.h>
#include <drm/drm_managed.h>
#include <drm/drm_print.h>
#include "ast_drv.h"
static u32 ast_get_vram_size(struct ast_device *ast)
{
u32 vram_size;
u8 vgacr99, vgacraa;
vgacraa = ast_get_index_reg(ast, AST_IO_VGACRI, 0xaa);
switch (vgacraa & AST_IO_VGACRAA_VGAMEM_SIZE_MASK) {
case 0:
vram_size = SZ_8M;
break;
case 1:
vram_size = SZ_16M;
break;
case 2:
vram_size = SZ_32M;
break;
case 3:
vram_size = SZ_64M;
break;
}
vgacr99 = ast_get_index_reg(ast, AST_IO_VGACRI, 0x99);
switch (vgacr99 & AST_IO_VGACR99_VGAMEM_RSRV_MASK) {
case 1:
vram_size -= SZ_1M;
break;
case 2:
vram_size -= SZ_2M;
break;
case 3:
vram_size -= SZ_4M;
break;
}
return vram_size;
}
int ast_mm_init(struct ast_device *ast)
{
struct drm_device *dev = &ast->base;
struct pci_dev *pdev = to_pci_dev(dev->dev);
resource_size_t base, size;
u32 vram_size;
base = pci_resource_start(pdev, 0);
size = pci_resource_len(pdev, 0);
/* Don't fail on errors, but performance might be reduced. */
devm_arch_io_reserve_memtype_wc(dev->dev, base, size);
devm_arch_phys_wc_add(dev->dev, base, size);
vram_size = ast_get_vram_size(ast);
ast->vram = devm_ioremap_wc(dev->dev, base, vram_size);
if (!ast->vram)
return -ENOMEM;
ast->vram_base = base;
ast->vram_size = vram_size;
return 0;
}
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