1 /**************************************************************************
2  * Copyright (c) 2011, Intel Corporation.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms and conditions of the GNU General Public License,
7  * version 2, as published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  **************************************************************************/
15 
16 #include <drm/drmP.h>
17 #include "psb_drv.h"
18 
19 void gma_get_core_freq(struct drm_device *dev)
20 {
21 	uint32_t clock;
22 	struct pci_dev *pci_root = pci_get_bus_and_slot(0, 0);
23 	struct drm_psb_private *dev_priv = dev->dev_private;
24 
25 	/*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/
26 	/*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/
27 
28 	pci_write_config_dword(pci_root, 0xD0, 0xD0050300);
29 	pci_read_config_dword(pci_root, 0xD4, &clock);
30 	pci_dev_put(pci_root);
31 
32 	switch (clock & 0x07) {
33 	case 0:
34 		dev_priv->core_freq = 100;
35 		break;
36 	case 1:
37 		dev_priv->core_freq = 133;
38 		break;
39 	case 2:
40 		dev_priv->core_freq = 150;
41 		break;
42 	case 3:
43 		dev_priv->core_freq = 178;
44 		break;
45 	case 4:
46 		dev_priv->core_freq = 200;
47 		break;
48 	case 5:
49 	case 6:
50 	case 7:
51 		dev_priv->core_freq = 266;
52 		break;
53 	default:
54 		dev_priv->core_freq = 0;
55 	}
56 }
57