102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
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/*
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* Copyright 2012 Red Hat Inc.
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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
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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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 NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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*/
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/*
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* Authors: Dave Airlie <airlied@redhat.com>
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*/
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#include <linux/pci.h>
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#include <drm/drm_managed.h>
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#include <drm/drm_print.h>
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#include "ast_drv.h"
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static u32 ast_get_vram_size(struct ast_private *ast)
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{
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u8 jreg;
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u32 vram_size;
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ast_open_key(ast);
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vram_size = AST_VIDMEM_DEFAULT_SIZE;
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jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
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switch (jreg & 3) {
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case 0:
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vram_size = AST_VIDMEM_SIZE_8M;
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break;
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case 1:
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vram_size = AST_VIDMEM_SIZE_16M;
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break;
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case 2:
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vram_size = AST_VIDMEM_SIZE_32M;
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break;
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case 3:
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vram_size = AST_VIDMEM_SIZE_64M;
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break;
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}
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jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
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switch (jreg & 0x03) {
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case 1:
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vram_size -= 0x100000;
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break;
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case 2:
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vram_size -= 0x200000;
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break;
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case 3:
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vram_size -= 0x400000;
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break;
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}
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return vram_size;
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}
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int ast_mm_init(struct ast_private *ast)
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{
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struct drm_device *dev = &ast->base;
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struct pci_dev *pdev = to_pci_dev(dev->dev);
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resource_size_t base, size;
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u32 vram_size;
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base = pci_resource_start(pdev, 0);
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size = pci_resource_len(pdev, 0);
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/* Don't fail on errors, but performance might be reduced. */
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devm_arch_io_reserve_memtype_wc(dev->dev, base, size);
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devm_arch_phys_wc_add(dev->dev, base, size);
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vram_size = ast_get_vram_size(ast);
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ast->vram = devm_ioremap_wc(dev->dev, base, vram_size);
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if (!ast->vram)
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return -ENOMEM;
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ast->vram_base = base;
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ast->vram_size = vram_size;
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ast->vram_fb_available = vram_size;
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return 0;
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}
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