rt-thread-official/bsp/samd21/sam_d2x_asflib/common/services/clock/pll.h

342 lines
10 KiB
C

/**
* \file
*
* \brief PLL management
*
* Copyright (c) 2010-2015 Atmel Corporation. All rights reserved.
*
* \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
*
*/
/*
* Support and FAQ: visit <a href="http://www.atmel.com/design-support/">Atmel Support</a>
*/
#ifndef CLK_PLL_H_INCLUDED
#define CLK_PLL_H_INCLUDED
#include "parts.h"
#include "conf_clock.h"
#if SAM3S
# include "sam3s/pll.h"
#elif SAM3XA
# include "sam3x/pll.h"
#elif SAM3U
# include "sam3u/pll.h"
#elif SAM3N
# include "sam3n/pll.h"
#elif SAM4S
# include "sam4s/pll.h"
#elif SAM4E
# include "sam4e/pll.h"
#elif SAM4C
# include "sam4c/pll.h"
#elif SAM4CM
# include "sam4cm/pll.h"
#elif SAM4CP
# include "sam4cp/pll.h"
#elif SAM4L
# include "sam4l/pll.h"
#elif SAM4N
# include "sam4n/pll.h"
#elif SAMG
# include "samg/pll.h"
#elif SAMV71
# include "samv71/pll.h"
#elif SAMV70
# include "samv70/pll.h"
#elif SAME70
# include "same70/pll.h"
#elif SAMS70
# include "sams70/pll.h"
#elif (UC3A0 || UC3A1)
# include "uc3a0_a1/pll.h"
#elif UC3A3
# include "uc3a3_a4/pll.h"
#elif UC3B
# include "uc3b0_b1/pll.h"
#elif UC3C
# include "uc3c/pll.h"
#elif UC3D
# include "uc3d/pll.h"
#elif (UC3L0128 || UC3L0256 || UC3L3_L4)
# include "uc3l/pll.h"
#elif XMEGA
# include "xmega/pll.h"
#else
# error Unsupported chip type
#endif
/**
* \ingroup clk_group
* \defgroup pll_group PLL Management
*
* This group contains functions and definitions related to configuring
* and enabling/disabling on-chip PLLs. A PLL will take an input signal
* (the \em source), optionally divide the frequency by a configurable
* \em divider, and then multiply the frequency by a configurable \em
* multiplier.
*
* Some devices don't support input dividers; specifying any other
* divisor than 1 on these devices will result in an assertion failure.
* Other devices may have various restrictions to the frequency range of
* the input and output signals.
*
* \par Example: Setting up PLL0 with default parameters
*
* The following example shows how to configure and enable PLL0 using
* the default parameters specified using the configuration symbols
* listed above.
* \code
pll_enable_config_defaults(0); \endcode
*
* To configure, enable PLL0 using the default parameters and to disable
* a specific feature like Wide Bandwidth Mode (a UC3A3-specific
* PLL option.), you can use this initialization process.
* \code
struct pll_config pllcfg;
if (pll_is_locked(pll_id)) {
return; // Pll already running
}
pll_enable_source(CONFIG_PLL0_SOURCE);
pll_config_defaults(&pllcfg, 0);
pll_config_set_option(&pllcfg, PLL_OPT_WBM_DISABLE);
pll_enable(&pllcfg, 0);
pll_wait_for_lock(0); \endcode
*
* When the last function call returns, PLL0 is ready to be used as the
* main system clock source.
*
* \section pll_group_config Configuration Symbols
*
* Each PLL has a set of default parameters determined by the following
* configuration symbols in the application's configuration file:
* - \b CONFIG_PLLn_SOURCE: The default clock source connected to the
* input of PLL \a n. Must be one of the values defined by the
* #pll_source enum.
* - \b CONFIG_PLLn_MUL: The default multiplier (loop divider) of PLL
* \a n.
* - \b CONFIG_PLLn_DIV: The default input divider of PLL \a n.
*
* These configuration symbols determine the result of calling
* pll_config_defaults() and pll_get_default_rate().
*
* @{
*/
//! \name Chip-specific PLL characteristics
//@{
/**
* \def PLL_MAX_STARTUP_CYCLES
* \brief Maximum PLL startup time in number of slow clock cycles
*/
/**
* \def NR_PLLS
* \brief Number of on-chip PLLs
*/
/**
* \def PLL_MIN_HZ
* \brief Minimum frequency that the PLL can generate
*/
/**
* \def PLL_MAX_HZ
* \brief Maximum frequency that the PLL can generate
*/
/**
* \def PLL_NR_OPTIONS
* \brief Number of PLL option bits
*/
//@}
/**
* \enum pll_source
* \brief PLL clock source
*/
//! \name PLL configuration
//@{
/**
* \struct pll_config
* \brief Hardware-specific representation of PLL configuration.
*
* This structure contains one or more device-specific values
* representing the current PLL configuration. The contents of this
* structure is typically different from platform to platform, and the
* user should not access any fields except through the PLL
* configuration API.
*/
/**
* \fn void pll_config_init(struct pll_config *cfg,
* enum pll_source src, unsigned int div, unsigned int mul)
* \brief Initialize PLL configuration from standard parameters.
*
* \note This function may be defined inline because it is assumed to be
* called very few times, and usually with constant parameters. Inlining
* it will in such cases reduce the code size significantly.
*
* \param cfg The PLL configuration to be initialized.
* \param src The oscillator to be used as input to the PLL.
* \param div PLL input divider.
* \param mul PLL loop divider (i.e. multiplier).
*
* \return A configuration which will make the PLL run at
* (\a mul / \a div) times the frequency of \a src
*/
/**
* \def pll_config_defaults(cfg, pll_id)
* \brief Initialize PLL configuration using default parameters.
*
* After this function returns, \a cfg will contain a configuration
* which will make the PLL run at (CONFIG_PLLx_MUL / CONFIG_PLLx_DIV)
* times the frequency of CONFIG_PLLx_SOURCE.
*
* \param cfg The PLL configuration to be initialized.
* \param pll_id Use defaults for this PLL.
*/
/**
* \def pll_get_default_rate(pll_id)
* \brief Get the default rate in Hz of \a pll_id
*/
/**
* \fn void pll_config_set_option(struct pll_config *cfg,
* unsigned int option)
* \brief Set the PLL option bit \a option in the configuration \a cfg.
*
* \param cfg The PLL configuration to be changed.
* \param option The PLL option bit to be set.
*/
/**
* \fn void pll_config_clear_option(struct pll_config *cfg,
* unsigned int option)
* \brief Clear the PLL option bit \a option in the configuration \a cfg.
*
* \param cfg The PLL configuration to be changed.
* \param option The PLL option bit to be cleared.
*/
/**
* \fn void pll_config_read(struct pll_config *cfg, unsigned int pll_id)
* \brief Read the currently active configuration of \a pll_id.
*
* \param cfg The configuration object into which to store the currently
* active configuration.
* \param pll_id The ID of the PLL to be accessed.
*/
/**
* \fn void pll_config_write(const struct pll_config *cfg,
* unsigned int pll_id)
* \brief Activate the configuration \a cfg on \a pll_id
*
* \param cfg The configuration object representing the PLL
* configuration to be activated.
* \param pll_id The ID of the PLL to be updated.
*/
//@}
//! \name Interaction with the PLL hardware
//@{
/**
* \fn void pll_enable(const struct pll_config *cfg,
* unsigned int pll_id)
* \brief Activate the configuration \a cfg and enable PLL \a pll_id.
*
* \param cfg The PLL configuration to be activated.
* \param pll_id The ID of the PLL to be enabled.
*/
/**
* \fn void pll_disable(unsigned int pll_id)
* \brief Disable the PLL identified by \a pll_id.
*
* After this function is called, the PLL identified by \a pll_id will
* be disabled. The PLL configuration stored in hardware may be affected
* by this, so if the caller needs to restore the same configuration
* later, it should either do a pll_config_read() before disabling the
* PLL, or remember the last configuration written to the PLL.
*
* \param pll_id The ID of the PLL to be disabled.
*/
/**
* \fn bool pll_is_locked(unsigned int pll_id)
* \brief Determine whether the PLL is locked or not.
*
* \param pll_id The ID of the PLL to check.
*
* \retval true The PLL is locked and ready to use as a clock source
* \retval false The PLL is not yet locked, or has not been enabled.
*/
/**
* \fn void pll_enable_source(enum pll_source src)
* \brief Enable the source of the pll.
* The source is enabled, if the source is not already running.
*
* \param src The ID of the PLL source to enable.
*/
/**
* \fn void pll_enable_config_defaults(unsigned int pll_id)
* \brief Enable the pll with the default configuration.
* PLL is enabled, if the PLL is not already locked.
*
* \param pll_id The ID of the PLL to enable.
*/
/**
* \brief Wait for PLL \a pll_id to become locked
*
* \todo Use a timeout to avoid waiting forever and hanging the system
*
* \param pll_id The ID of the PLL to wait for.
*
* \retval STATUS_OK The PLL is now locked.
* \retval ERR_TIMEOUT Timed out waiting for PLL to become locked.
*/
static inline int pll_wait_for_lock(unsigned int pll_id)
{
Assert(pll_id < NR_PLLS);
while (!pll_is_locked(pll_id)) {
/* Do nothing */
}
return 0;
}
//@}
//! @}
#endif /* CLK_PLL_H_INCLUDED */