1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the 6 * "Software"), to deal in the Software without restriction, including 7 * without limitation the rights to use, copy, modify, merge, publish, 8 * distribute, sub license, and/or sell copies of the Software, and to 9 * permit persons to whom the Software is furnished to do so, subject to 10 * the following conditions: 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 18 * USE OR OTHER DEALINGS IN THE SOFTWARE. 19 * 20 * The above copyright notice and this permission notice (including the 21 * next paragraph) shall be included in all copies or substantial portions 22 * of the Software. 23 * 24 */ 25 /* 26 * Authors: Dave Airlie <airlied@redhat.com> 27 */ 28 29 #include <linux/pci.h> 30 31 #include <drm/drm_managed.h> 32 #include <drm/drm_print.h> 33 34 #include "ast_drv.h" 35 36 static u32 ast_get_vram_size(struct ast_device *ast) 37 { 38 u32 vram_size; 39 u8 vgacr99, vgacraa; 40 41 vgacraa = ast_get_index_reg(ast, AST_IO_VGACRI, 0xaa); 42 switch (vgacraa & AST_IO_VGACRAA_VGAMEM_SIZE_MASK) { 43 case 0: 44 vram_size = SZ_8M; 45 break; 46 case 1: 47 vram_size = SZ_16M; 48 break; 49 case 2: 50 vram_size = SZ_32M; 51 break; 52 case 3: 53 vram_size = SZ_64M; 54 break; 55 } 56 57 vgacr99 = ast_get_index_reg(ast, AST_IO_VGACRI, 0x99); 58 switch (vgacr99 & AST_IO_VGACR99_VGAMEM_RSRV_MASK) { 59 case 1: 60 vram_size -= SZ_1M; 61 break; 62 case 2: 63 vram_size -= SZ_2M; 64 break; 65 case 3: 66 vram_size -= SZ_4M; 67 break; 68 } 69 70 return vram_size; 71 } 72 73 int ast_mm_init(struct ast_device *ast) 74 { 75 struct drm_device *dev = &ast->base; 76 struct pci_dev *pdev = to_pci_dev(dev->dev); 77 resource_size_t base, size; 78 u32 vram_size; 79 80 base = pci_resource_start(pdev, 0); 81 size = pci_resource_len(pdev, 0); 82 83 /* Don't fail on errors, but performance might be reduced. */ 84 devm_arch_io_reserve_memtype_wc(dev->dev, base, size); 85 devm_arch_phys_wc_add(dev->dev, base, size); 86 87 vram_size = ast_get_vram_size(ast); 88 89 ast->vram = devm_ioremap_wc(dev->dev, base, vram_size); 90 if (!ast->vram) 91 return -ENOMEM; 92 93 ast->vram_base = base; 94 ast->vram_size = vram_size; 95 96 return 0; 97 } 98