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
 36static 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
 76int 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}