1 // SPDX-License-Identifier: GPL-2.0-only
2 /**************************************************************************
3  * Copyright (c) 2011, Intel Corporation.
4  * All Rights Reserved.
5  *
6  **************************************************************************/
7 
8 #include <drm/drmP.h>
9 #include "psb_drv.h"
10 
11 void gma_get_core_freq(struct drm_device *dev)
12 {
13 	uint32_t clock;
14 	struct pci_dev *pci_root =
15 		pci_get_domain_bus_and_slot(pci_domain_nr(dev->pdev->bus),
16 					    0, 0);
17 	struct drm_psb_private *dev_priv = dev->dev_private;
18 
19 	/*pci_write_config_dword(pci_root, 0xD4, 0x00C32004);*/
20 	/*pci_write_config_dword(pci_root, 0xD0, 0xE0033000);*/
21 
22 	pci_write_config_dword(pci_root, 0xD0, 0xD0050300);
23 	pci_read_config_dword(pci_root, 0xD4, &clock);
24 	pci_dev_put(pci_root);
25 
26 	switch (clock & 0x07) {
27 	case 0:
28 		dev_priv->core_freq = 100;
29 		break;
30 	case 1:
31 		dev_priv->core_freq = 133;
32 		break;
33 	case 2:
34 		dev_priv->core_freq = 150;
35 		break;
36 	case 3:
37 		dev_priv->core_freq = 178;
38 		break;
39 	case 4:
40 		dev_priv->core_freq = 200;
41 		break;
42 	case 5:
43 	case 6:
44 	case 7:
45 		dev_priv->core_freq = 266;
46 		break;
47 	default:
48 		dev_priv->core_freq = 0;
49 	}
50 }
51