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_gem_vram_helper.h>
 32#include <drm/drm_managed.h>
 33#include <drm/drm_print.h>
 34
 35#include "ast_drv.h"
 36
 37static u32 ast_get_vram_size(struct ast_private *ast)
 38{
 39	u8 jreg;
 40	u32 vram_size;
 41
 42	ast_open_key(ast);
 43
 44	vram_size = AST_VIDMEM_DEFAULT_SIZE;
 45	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
 46	switch (jreg & 3) {
 47	case 0:
 48		vram_size = AST_VIDMEM_SIZE_8M;
 49		break;
 50	case 1:
 51		vram_size = AST_VIDMEM_SIZE_16M;
 52		break;
 53	case 2:
 54		vram_size = AST_VIDMEM_SIZE_32M;
 55		break;
 56	case 3:
 57		vram_size = AST_VIDMEM_SIZE_64M;
 58		break;
 59	}
 60
 61	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0x99, 0xff);
 62	switch (jreg & 0x03) {
 63	case 1:
 64		vram_size -= 0x100000;
 65		break;
 66	case 2:
 67		vram_size -= 0x200000;
 68		break;
 69	case 3:
 70		vram_size -= 0x400000;
 71		break;
 72	}
 73
 74	return vram_size;
 75}
 76
 77static void ast_mm_release(struct drm_device *dev, void *ptr)
 78{
 79	struct ast_private *ast = to_ast_private(dev);
 80	struct pci_dev *pdev = to_pci_dev(dev->dev);
 81
 82	arch_phys_wc_del(ast->fb_mtrr);
 83	arch_io_free_memtype_wc(pci_resource_start(pdev, 0),
 84				pci_resource_len(pdev, 0));
 85}
 86
 87int ast_mm_init(struct ast_private *ast)
 88{
 89	struct drm_device *dev = &ast->base;
 90	struct pci_dev *pdev = to_pci_dev(dev->dev);
 91	u32 vram_size;
 92	int ret;
 93
 94	vram_size = ast_get_vram_size(ast);
 95
 96	ret = drmm_vram_helper_init(dev, pci_resource_start(pdev, 0), vram_size);
 97	if (ret) {
 98		drm_err(dev, "Error initializing VRAM MM; %d\n", ret);
 99		return ret;
100	}
101
102	arch_io_reserve_memtype_wc(pci_resource_start(pdev, 0),
103				   pci_resource_len(pdev, 0));
104	ast->fb_mtrr = arch_phys_wc_add(pci_resource_start(pdev, 0),
105					pci_resource_len(pdev, 0));
106
107	return drmm_add_action_or_reset(dev, ast_mm_release, NULL);
108}