drivers/video/fbdev/via/via_clock.h

   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__ */