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_private *ast) 37 { 38 u8 jreg; 39 u32 vram_size; 40 41 ast_open_key(ast); 42 43 vram_size = AST_VIDMEM_DEFAULT_SIZE; 44 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff); 45 switch (jreg & 3) { 46 case 0: 47 vram_size = AST_VIDMEM_SIZE_8M; 48 break; 49 case 1: 50 vram_size = AST_VIDMEM_SIZE_16M; 51 break; 52 case 2: 53 vram_size = AST_VIDMEM_SIZE_32M; 54 break; 55 case 3: 56 vram_size = AST_VIDMEM_SIZE_64M; 57 break; 58 } 59 60 jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff); 61 switch (jreg & 0x03) { 62 case 1: 63 vram_size -= 0x100000; 64 break; 65 case 2: 66 vram_size -= 0x200000; 67 break; 68 case 3: 69 vram_size -= 0x400000; 70 break; 71 } 72 73 return vram_size; 74 } 75 76 int ast_mm_init(struct ast_private *ast) 77 { 78 struct drm_device *dev = &ast->base; 79 struct pci_dev *pdev = to_pci_dev(dev->dev); 80 resource_size_t base, size; 81 u32 vram_size; 82 83 base = pci_resource_start(pdev, 0); 84 size = pci_resource_len(pdev, 0); 85 86 /* Don't fail on errors, but performance might be reduced. */ 87 devm_arch_io_reserve_memtype_wc(dev->dev, base, size); 88 devm_arch_phys_wc_add(dev->dev, base, size); 89 90 vram_size = ast_get_vram_size(ast); 91 92 ast->vram = devm_ioremap_wc(dev->dev, base, vram_size); 93 if (!ast->vram) 94 return -ENOMEM; 95 96 ast->vram_base = base; 97 ast->vram_size = vram_size; 98 ast->vram_fb_available = vram_size; 99 100 return 0; 101 } 102