FreeRTOS/Demo/CORTEX_ATSAM3X_Atmel_Studio/src/asf/common/services/clock/sam3x/genclk.h

/**
 * \file
 *
 * \brief Chip-specific generic clock management.
 *
 * Copyright (c) 2011 - 2012 Atmel Corporation. All rights reserved.s
 *
 * \asf_license_start
 *
 * \page License
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. The name of Atmel may not be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 4. This software may only be redistributed and used in connection with an
 *    Atmel microcontroller product.
 *
 * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * \asf_license_stop
 *
 */

#ifndef CHIP_GENCLK_H_INCLUDED
#define CHIP_GENCLK_H_INCLUDED

#include <osc.h>
#include <pll.h>

/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
extern "C" {
#endif
/**INDENT-ON**/
/// @endcond

/**
 * \weakgroup genclk_group
 * @{
 */

//! \name Programmable Clock Identifiers (PCK)
//@{
#define GENCLK_PCK_0			0						//!< PCK0 ID
#define GENCLK_PCK_1			1						//!< PCK1 ID
#define GENCLK_PCK_2			2						//!< PCK2 ID
//@}

//! \name Programmable Clock Sources (PCK)
//@{

enum genclk_source {
	GENCLK_PCK_SRC_SLCK_RC			=	0,	//!< Internal 32kHz RC oscillator as PCK source clock
	GENCLK_PCK_SRC_SLCK_XTAL		=	1,	//!< External 32kHz crystal oscillator as PCK source clock
	GENCLK_PCK_SRC_SLCK_BYPASS		=	2,	//!< External 32kHz bypass oscillator as PCK source clock
	GENCLK_PCK_SRC_MAINCK_4M_RC		=	3,	//!< Internal 4MHz RC oscillator as PCK source clock
	GENCLK_PCK_SRC_MAINCK_8M_RC		=	4,	//!< Internal 8MHz RC oscillator as PCK source clock
	GENCLK_PCK_SRC_MAINCK_12M_RC	=	5,	//!< Internal 12MHz RC oscillator as PCK source clock
	GENCLK_PCK_SRC_MAINCK_XTAL		=	6,	//!< External crystal oscillator as PCK source clock
	GENCLK_PCK_SRC_MAINCK_BYPASS	=	7,	//!< External bypass oscillator as PCK source clock
	GENCLK_PCK_SRC_PLLACK			=	8,	//!< Use PLLACK as PCK source clock
	GENCLK_PCK_SRC_PLLBCK			=	9,	//!< Use PLLBCK as PCK source clock
};

//@}

//! \name Programmable Clock Prescalers (PCK)
//@{

enum genclk_divider {
	GENCLK_PCK_PRES_1	=	PMC_PCK_PRES_CLK_1,		//!< Set PCK clock prescaler to 1
	GENCLK_PCK_PRES_2	=	PMC_PCK_PRES_CLK_2,		//!< Set PCK clock prescaler to 2
	GENCLK_PCK_PRES_4	=	PMC_PCK_PRES_CLK_4,		//!< Set PCK clock prescaler to 4
	GENCLK_PCK_PRES_8	=	PMC_PCK_PRES_CLK_8,		//!< Set PCK clock prescaler to 8
	GENCLK_PCK_PRES_16	=	PMC_PCK_PRES_CLK_16,	//!< Set PCK clock prescaler to 16
	GENCLK_PCK_PRES_32	=	PMC_PCK_PRES_CLK_32,	//!< Set PCK clock prescaler to 32
	GENCLK_PCK_PRES_64	=	PMC_PCK_PRES_CLK_64,	//!< Set PCK clock prescaler to 64
};

//@}

struct genclk_config {
	uint32_t ctrl;
};

static inline void genclk_config_defaults(struct genclk_config *p_cfg,
		uint32_t ul_id)
{
	ul_id = ul_id;
	p_cfg->ctrl = 0;
}

static inline void genclk_config_read(struct genclk_config *p_cfg,
		uint32_t ul_id)
{
	p_cfg->ctrl = PMC->PMC_PCK[ul_id];
}

static inline void genclk_config_write(const struct genclk_config *p_cfg,
		uint32_t ul_id)
{
	PMC->PMC_PCK[ul_id] = p_cfg->ctrl;
}

//! \name Programmable Clock Source and Prescaler configuration
//@{

static inline void genclk_config_set_source(struct genclk_config *p_cfg,
		enum genclk_source e_src)
{
	p_cfg->ctrl &= (~PMC_PCK_CSS_Msk);

	switch (e_src) {
	case GENCLK_PCK_SRC_SLCK_RC:
	case GENCLK_PCK_SRC_SLCK_XTAL:
	case GENCLK_PCK_SRC_SLCK_BYPASS:
		p_cfg->ctrl |= (PMC_MCKR_CSS_SLOW_CLK);
		break;

	case GENCLK_PCK_SRC_MAINCK_4M_RC:
	case GENCLK_PCK_SRC_MAINCK_8M_RC:
	case GENCLK_PCK_SRC_MAINCK_12M_RC:
	case GENCLK_PCK_SRC_MAINCK_XTAL:
	case GENCLK_PCK_SRC_MAINCK_BYPASS:
		p_cfg->ctrl |= (PMC_MCKR_CSS_MAIN_CLK);
		break;

	case GENCLK_PCK_SRC_PLLACK:
		p_cfg->ctrl |= (PMC_MCKR_CSS_PLLA_CLK);
		break;

	case GENCLK_PCK_SRC_PLLBCK:
		p_cfg->ctrl |= (PMC_MCKR_CSS_UPLL_CLK);
		break;
	}
}

static inline void genclk_config_set_divider(struct genclk_config *p_cfg,
		uint32_t e_divider)
{
	p_cfg->ctrl &= ~PMC_PCK_PRES_Msk;
	p_cfg->ctrl |= e_divider;	
}

//@}

static inline void genclk_enable(const struct genclk_config *p_cfg, uint32_t ul_id)
{
	PMC->PMC_PCK[ul_id] = p_cfg->ctrl;
	pmc_enable_pck(ul_id);
}

static inline void genclk_disable(uint32_t ul_id)
{
	pmc_disable_pck(ul_id);
}

static inline void genclk_enable_source(enum genclk_source e_src)
{
	switch (e_src) {
	case GENCLK_PCK_SRC_SLCK_RC:
		if (!osc_is_ready(OSC_SLCK_32K_RC)) {
			osc_enable(OSC_SLCK_32K_RC);
			osc_wait_ready(OSC_SLCK_32K_RC);
		}		
		break;
	
	case GENCLK_PCK_SRC_SLCK_XTAL:
		if (!osc_is_ready(OSC_SLCK_32K_XTAL)) {
			osc_enable(OSC_SLCK_32K_XTAL);
			osc_wait_ready(OSC_SLCK_32K_XTAL);
		}
		break;
		
	case GENCLK_PCK_SRC_SLCK_BYPASS:
		if (!osc_is_ready(OSC_SLCK_32K_BYPASS)) {
			osc_enable(OSC_SLCK_32K_BYPASS);
			osc_wait_ready(OSC_SLCK_32K_BYPASS);		
		}		
		break;
	
    case GENCLK_PCK_SRC_MAINCK_4M_RC:
		if (!osc_is_ready(OSC_MAINCK_4M_RC)) {
			osc_enable(OSC_MAINCK_4M_RC);
			osc_wait_ready(OSC_MAINCK_4M_RC);		
		}		
		break;

    case GENCLK_PCK_SRC_MAINCK_8M_RC:
		if (!osc_is_ready(OSC_MAINCK_8M_RC)) {
			osc_enable(OSC_MAINCK_8M_RC);
			osc_wait_ready(OSC_MAINCK_8M_RC);		
		}		
		break;

    case GENCLK_PCK_SRC_MAINCK_12M_RC:
		if (!osc_is_ready(OSC_MAINCK_12M_RC)) {
			osc_enable(OSC_MAINCK_12M_RC);
			osc_wait_ready(OSC_MAINCK_12M_RC);		
		}		
		break;

    case GENCLK_PCK_SRC_MAINCK_XTAL:
		if (!osc_is_ready(OSC_MAINCK_XTAL)) {
			osc_enable(OSC_MAINCK_XTAL);
			osc_wait_ready(OSC_MAINCK_XTAL);		
		}		
		break;

    case GENCLK_PCK_SRC_MAINCK_BYPASS:
		if (!osc_is_ready(OSC_MAINCK_BYPASS)) {
			osc_enable(OSC_MAINCK_BYPASS);
			osc_wait_ready(OSC_MAINCK_BYPASS);		
		}		
		break;

#ifdef CONFIG_PLL0_SOURCE
	case GENCLK_PCK_SRC_PLLACK:
		pll_enable_config_defaults(0);		
		break;	
#endif

#ifdef CONFIG_PLL1_SOURCE
	case GENCLK_PCK_SRC_PLLBCK:
		pll_enable_config_defaults(1);		
		break;	
#endif	

	default:
		Assert(false);
		break;
	}
}

//! @}

/// @cond 0
/**INDENT-OFF**/
#ifdef __cplusplus
}
#endif
/**INDENT-ON**/
/// @endcond

#endif /* CHIP_GENCLK_H_INCLUDED */