1. 根目录:
2. drivers
3. video
4. via
5. via_clock.h

/*
 * Copyright 1998-2008 VIA Technologies, Inc. All Rights Reserved.
 * Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
 * Copyright 2011 Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation;
 * either version 2, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTIES OR REPRESENTATIONS; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE.See the GNU General Public License
 * for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
/*
 * clock and PLL management functions
 */

#ifndef __VIA_CLOCK_H__
#define __VIA_CLOCK_H__

#include <linux/types.h>

enum via_clksrc {
	VIA_CLKSRC_X1 = 0,
	VIA_CLKSRC_TVX1,
	VIA_CLKSRC_TVPLL,
	VIA_CLKSRC_DVP1TVCLKR,
	VIA_CLKSRC_CAP0,
	VIA_CLKSRC_CAP1,
};

struct via_pll_config {
	u16 multiplier;
	u8 divisor;
	u8 rshift;
};

struct via_clock {
	void (*set_primary_clock_state)(u8 state);
	void (*set_primary_clock_source)(enum via_clksrc src, bool use_pll);
	void (*set_primary_pll_state)(u8 state);
	void (*set_primary_pll)(struct via_pll_config config);

	void (*set_secondary_clock_state)(u8 state);
	void (*set_secondary_clock_source)(enum via_clksrc src, bool use_pll);
	void (*set_secondary_pll_state)(u8 state);
	void (*set_secondary_pll)(struct via_pll_config config);

	void (*set_engine_pll_state)(u8 state);
	void (*set_engine_pll)(struct via_pll_config config);
};


static inline u32 get_pll_internal_frequency(u32 ref_freq,
	struct via_pll_config pll)
{
	return ref_freq / pll.divisor * pll.multiplier;
}

static inline u32 get_pll_output_frequency(u32 ref_freq,
	struct via_pll_config pll)
{
	return get_pll_internal_frequency(ref_freq, pll) >> pll.rshift;
}

void via_clock_init(struct via_clock *clock, int gfx_chip);

#endif /* __VIA_CLOCK_H__ */