1 /*
2  * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
3  * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
4  * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public
8  * License as published by the Free Software Foundation;
9  * either version 2, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
13  * the implied warranty of MERCHANTABILITY or FITNESS FOR
14  * A PARTICULAR PURPOSE.See the GNU General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc.,
20  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21  */
22 /*
23  * clock and PLL management functions
24  */
25 
26 #ifndef __VIA_CLOCK_H__
27 #define __VIA_CLOCK_H__
28 
29 #include <linux/types.h>
30 
31 enum via_clksrc {
32 	VIA_CLKSRC_X1 = 0,
33 	VIA_CLKSRC_TVX1,
34 	VIA_CLKSRC_TVPLL,
35 	VIA_CLKSRC_DVP1TVCLKR,
36 	VIA_CLKSRC_CAP0,
37 	VIA_CLKSRC_CAP1,
38 };
39 
40 struct via_pll_config {
41 	u16 multiplier;
42 	u8 divisor;
43 	u8 rshift;
44 };
45 
46 struct via_clock {
47 	void (*set_primary_clock_state)(u8 state);
48 	void (*set_primary_clock_source)(enum via_clksrc src, bool use_pll);
49 	void (*set_primary_pll_state)(u8 state);
50 	void (*set_primary_pll)(struct via_pll_config config);
51 
52 	void (*set_secondary_clock_state)(u8 state);
53 	void (*set_secondary_clock_source)(enum via_clksrc src, bool use_pll);
54 	void (*set_secondary_pll_state)(u8 state);
55 	void (*set_secondary_pll)(struct via_pll_config config);
56 
57 	void (*set_engine_pll_state)(u8 state);
58 	void (*set_engine_pll)(struct via_pll_config config);
59 };
60 
61 
62 static inline u32 get_pll_internal_frequency(u32 ref_freq,
63 	struct via_pll_config pll)
64 {
65 	return ref_freq / pll.divisor * pll.multiplier;
66 }
67 
68 static inline u32 get_pll_output_frequency(u32 ref_freq,
69 	struct via_pll_config pll)
70 {
71 	return get_pll_internal_frequency(ref_freq, pll) >> pll.rshift;
72 }
73 
74 void via_clock_init(struct via_clock *clock, int gfx_chip);
75 
76 #endif /* __VIA_CLOCK_H__ */
77