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
get_pll_internal_frequency(u32 ref_freq,struct via_pll_config pll)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
get_pll_output_frequency(u32 ref_freq,struct via_pll_config pll)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