/* ---------------------------------------------------------------------------- | |
* ATMEL Microcontroller Software Support | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2010, Atmel Corporation | |
* | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* - Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the disclaimer below. | |
* | |
* Atmel's name may not be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* DISCLAIMER: 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 | |
* 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. | |
* ---------------------------------------------------------------------------- | |
*/ | |
/** | |
* \file | |
* | |
* Implementation of the power management control low level functions. | |
*/ | |
/*---------------------------------------------------------------------------- | |
* Headers | |
*----------------------------------------------------------------------------*/ | |
#include "chip.h" | |
#include <assert.h> | |
/*---------------------------------------------------------------------------- | |
* Local definitions | |
*----------------------------------------------------------------------------*/ | |
#define MASK_STATUS0 0xFFFFFF00 | |
#define MASK_STATUS1 0xFFFFFFFF | |
/*---------------------------------------------------------------------------- | |
* Local variables | |
*----------------------------------------------------------------------------*/ | |
/* Startup count for 4/8/12MHz fast RC */ | |
uint32_t PmcFastRcCnt = DEFAUTL_FAST_RC_COUNT; | |
/* Startup count for 3-20MHz main oscilator */ | |
uint32_t PmcMainOscCnt = DEFAUTL_MAIN_OSC_COUNT; | |
/* Startup count for PLLA */ | |
uint32_t PmcPllaCnt = DEFAUTL_PLLA_COUNT; | |
/* Startup count for UPLL */ | |
uint32_t PmcUpllCnt = DEFAUTL_UPLL_COUNT; | |
/*---------------------------------------------------------------------------- | |
* Local functions | |
*----------------------------------------------------------------------------*/ | |
/** | |
* \brief Switch MCK to PLLA clock. | |
*/ | |
static void _PMC_SwitchMck2PllaClock(void) | |
{ | |
/* Select PLLA as input clock for MCK */ | |
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_PLLA_CLK ; | |
/* Wait until the master clock is established */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Switch MCK to UPLL clock. | |
*/ | |
static void _PMC_SwitchMck2UpllClock(void) | |
{ | |
/* Select UPLL as input clock for MCK */ | |
/* UPLLDIV must be set (clock divided by 2) when UPLL is selected as source of clock for MCK. */ | |
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_UPLL_CLK | |
| PMC_MCKR_UPLLDIV; | |
/* Wait until the master clock is established */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Switch MCK to main clock. | |
*/ | |
static void _PMC_SwitchMck2MainClock(void) | |
{ | |
/* Select Main Oscillator as input clock for MCK */ | |
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK ; | |
/* Wait until the master clock is established */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Switch MCK to slow clock. | |
*/ | |
static void _PMC_SwitchMck2SlowClock(void) | |
{ | |
/* Select Slow Clock as input clock for MCK */ | |
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_SLOW_CLK ; | |
/* Wait until the master clock is established */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Set prescaler for MCK. | |
* | |
* \param prescaler Master Clock prescaler | |
*/ | |
static void _PMC_SetMckPrescaler(uint32_t prescaler) | |
{ | |
/* Change MCK Prescaler divider in PMC_MCKR register */ | |
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~PMC_MCKR_PRES_Msk) | prescaler; | |
/* Wait until the master clock is established */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/*---------------------------------------------------------------------------- | |
* Exported functions | |
*----------------------------------------------------------------------------*/ | |
/** | |
* \brief Enables the clock of a peripheral. The peripheral ID is used | |
* to identify which peripheral is targetted. | |
* | |
* \note The ID must NOT be shifted (i.e. 1 << ID_xxx). | |
* | |
* \param id Peripheral ID (ID_xxx). | |
*/ | |
extern void PMC_EnablePeripheral( uint32_t dwId ) | |
{ | |
assert( dwId < 45 ) ; | |
if ( dwId < 32 ) | |
{ | |
if ( (PMC->PMC_PCSR0 & ((uint32_t)1 << dwId)) == ((uint32_t)1 << dwId) ) | |
{ | |
TRACE_DEBUG( "PMC_EnablePeripheral: clock of peripheral" " %u is already enabled\n\r", dwId ) ; | |
} | |
else | |
{ | |
PMC->PMC_PCER0 = 1 << dwId ; | |
} | |
} | |
else | |
{ | |
dwId -= 32; | |
if ((PMC->PMC_PCSR1 & ((uint32_t)1 << dwId)) == ((uint32_t)1 << dwId)) | |
{ | |
TRACE_DEBUG( "PMC_EnablePeripheral: clock of peripheral" " %u is already enabled\n\r", dwId + 32 ) ; | |
} | |
else | |
{ | |
PMC->PMC_PCER1 = 1 << dwId ; | |
} | |
} | |
} | |
/** | |
* \brief Disables the clock of a peripheral. The peripheral ID is used | |
* to identify which peripheral is targetted. | |
* | |
* \note The ID must NOT be shifted (i.e. 1 << ID_xxx). | |
* | |
* \param id Peripheral ID (ID_xxx). | |
*/ | |
extern void PMC_DisablePeripheral( uint32_t dwId ) | |
{ | |
assert( dwId < 45 ) ; | |
if ( dwId < 32 ) | |
{ | |
if ( (PMC->PMC_PCSR0 & ((uint32_t)1 << dwId)) != ((uint32_t)1 << dwId) ) | |
{ | |
TRACE_DEBUG("PMC_DisablePeripheral: clock of peripheral" " %u is not enabled\n\r", dwId ) ; | |
} | |
else | |
{ | |
PMC->PMC_PCDR0 = 1 << dwId ; | |
} | |
} | |
else | |
{ | |
dwId -= 32 ; | |
if ( (PMC->PMC_PCSR1 & ((uint32_t)1 << dwId)) != ((uint32_t)1 << dwId) ) | |
{ | |
TRACE_DEBUG( "PMC_DisablePeripheral: clock of peripheral" " %u is not enabled\n\r", dwId + 32 ) ; | |
} | |
else | |
{ | |
PMC->PMC_PCDR1 = 1 << dwId ; | |
} | |
} | |
} | |
/** | |
* \brief Enable all the periph clock via PMC. | |
*/ | |
extern void PMC_EnableAllPeripherals( void ) | |
{ | |
PMC->PMC_PCER0 = MASK_STATUS0 ; | |
while ( (PMC->PMC_PCSR0 & MASK_STATUS0) != MASK_STATUS0 ) ; | |
PMC->PMC_PCER1 = MASK_STATUS1 ; | |
while ( (PMC->PMC_PCSR1 & MASK_STATUS1) != MASK_STATUS1 ) ; | |
TRACE_DEBUG( "Enable all periph clocks\n\r" ) ; | |
} | |
/** | |
* \brief Disable all the periph clock via PMC. | |
*/ | |
extern void PMC_DisableAllPeripherals( void ) | |
{ | |
PMC->PMC_PCDR0 = MASK_STATUS0 ; | |
while ( (PMC->PMC_PCSR0 & MASK_STATUS0) != 0 ) ; | |
PMC->PMC_PCDR1 = MASK_STATUS1 ; | |
while ( (PMC->PMC_PCSR1 & MASK_STATUS1) != 0 ) ; | |
TRACE_DEBUG( "Disable all periph clocks\n\r" ) ; | |
} | |
/** | |
* \brief Get Periph Status for the given peripheral ID. | |
* | |
* \param id Peripheral ID (ID_xxx). | |
*/ | |
extern uint32_t PMC_IsPeriphEnabled( uint32_t dwId ) | |
{ | |
assert( dwId < 45 ) ; | |
if ( dwId < 32 ) | |
{ | |
return ( PMC->PMC_PCSR0 & (1 << dwId) ) ; | |
} | |
else { | |
return ( PMC->PMC_PCSR1 & (1 << (dwId - 32)) ) ; | |
} | |
} | |
/** | |
* \brief Enable Programmable Clock x Output. | |
* | |
* \param pck pck ID (shifted as in register) | |
*/ | |
extern void PMC_EnablePck(uint32_t pck) | |
{ | |
PMC->PMC_SCER = pck; | |
} | |
/** | |
* \brief Disable Programmable Clock x Output | |
* | |
* \param pck pck ID (shifted as in register) | |
*/ | |
extern void PMC_DisablePck(uint32_t pck) | |
{ | |
PMC->PMC_SCDR = pck; | |
} | |
/** | |
* \brief Configure Programmable Clock with clock source and prescaler. | |
* | |
* \param id pck id (0, 1, 2) | |
* \param clockSource clock source input for pck | |
* \param prescaler prescaler for pck | |
* | |
* \note | |
* It is strongly recommended to disable the Programmable Clock before any | |
* configuration change and to re-enable it after the change is actually performed. | |
*/ | |
extern void PMC_ConfigurePck(uint32_t id, uint32_t clockSource, uint32_t prescaler) | |
{ | |
/* Configure PMC Programmable Clock */ | |
if (id == 0) | |
{ | |
PMC->PMC_PCK[0] = clockSource | prescaler; | |
while ( (PMC->PMC_SR & PMC_SR_PCKRDY0) == 0 ); | |
} | |
else if (id == 1) | |
{ | |
PMC->PMC_PCK[1] = clockSource | prescaler; | |
while ( (PMC->PMC_SR & PMC_SR_PCKRDY1) == 0 ); | |
} | |
else if (id == 2) | |
{ | |
PMC->PMC_PCK[2] = clockSource | prescaler; | |
while ( (PMC->PMC_SR & PMC_SR_PCKRDY2) == 0 ); | |
} | |
} | |
/** | |
* \brief Select external 32K Crystal. | |
* | |
* \note | |
* There's no option to return to internal slow RC after switching to ext 32kHz crystal. | |
*/ | |
/* TBD: move it to SUPC driver. */ | |
extern void SUPC_SelectExtCrystal32K(void) | |
{ | |
/* Select XTAL 32k instead of internal slow RC 32k for slow clock */ | |
if ( (SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST ) | |
{ | |
SUPC->SUPC_CR = SUPC_CR_KEY(0xA5u) | SUPC_CR_XTALSEL_CRYSTAL_SEL; | |
while( !(SUPC->SUPC_SR & SUPC_SR_OSCSEL) ); | |
} | |
} | |
/** | |
* \ Set startup time of 4/8/12MHz fast RC, 3-20MHz main oscilator, PLLA, UPLL. | |
* | |
* \param fastRcCnt Count for fast RC | |
* \param mainOscCnt Count for main OSC | |
* \param pllaCnt Count for PLLA | |
* \param upllCnt Count for UPLL | |
*/ | |
extern void PMC_SetStartupTime(uint32_t fastRcCnt, uint32_t mainOscCnt, uint32_t pllaCnt, uint32_t upllCnt) | |
{ | |
if (fastRcCnt != DEFAUTL_COUNT_NO_CHANGE) | |
{ | |
PmcFastRcCnt = fastRcCnt; | |
} | |
if (mainOscCnt != DEFAUTL_COUNT_NO_CHANGE) | |
{ | |
PmcMainOscCnt = mainOscCnt; | |
} | |
if (pllaCnt != DEFAUTL_COUNT_NO_CHANGE) | |
{ | |
PmcPllaCnt = pllaCnt; | |
} | |
if (upllCnt != DEFAUTL_COUNT_NO_CHANGE) | |
{ | |
PmcUpllCnt = upllCnt; | |
} | |
} | |
/** | |
* \ Get startup time of 4/8/12MHz fast RC, 3-20MHz main oscilator, PLLA, UPLL. | |
* | |
* \param pFastRcCnt Count for fast RC | |
* \param pMainOscCnt Count for main OSC | |
* \param pPllaCnt Count for PLLA | |
* \param pUpllCnt Count for UPLL | |
*/ | |
extern void PMC_GetStartupTime(uint32_t *pFastRcCnt, uint32_t *pMainOscCnt, uint32_t *pPllaCnt, uint32_t *pUpllCnt) | |
{ | |
if (pFastRcCnt != NULL) | |
{ | |
*pFastRcCnt = PmcFastRcCnt; | |
} | |
if (pMainOscCnt != NULL) | |
{ | |
*pMainOscCnt = PmcMainOscCnt; | |
} | |
if (pPllaCnt != NULL) | |
{ | |
*pPllaCnt = PmcPllaCnt; | |
} | |
if (pUpllCnt != NULL) | |
{ | |
*pUpllCnt = PmcUpllCnt; | |
} | |
} | |
/** | |
* \brief Enable external 12MHz oscilator as main clock input. | |
*/ | |
extern void PMC_EnableExtOsc12MHz(void) | |
{ | |
uint32_t read_MOR; | |
/* Before switching MAIN OSC on external crystal : enable it and don't disable | |
* at the same time RC OSC in case of if MAIN OSC is still using RC OSC | |
*/ | |
read_MOR = PMC->CKGR_MOR; | |
read_MOR &= ~CKGR_MOR_MOSCRCF_Msk; /* reset MOSCRCF field in MOR register before select RC 12MHz */ | |
read_MOR |= (CKGR_MOR_KEY(0x37u) | | |
CKGR_MOR_MOSCRCF_12MHz | | |
CKGR_MOR_MOSCXTEN | | |
CKGR_MOR_MOSCRCEN | | |
CKGR_MOR_MOSCXTST(PmcMainOscCnt)); /* enable external crystal - enable RC OSC */ | |
PMC->CKGR_MOR = read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MOSCRCS ) ); /* wait end of RC oscillator stabilization */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
read_MOR |= CKGR_MOR_MOSCSEL; /* select external crystal */ | |
PMC->CKGR_MOR = read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MOSCSELS ) ); /* Wait end of Main Oscillator Selection */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Disable external 12MHz oscilator. | |
*/ | |
extern void PMC_DisableExtOsc12MHz(void) | |
{ | |
uint32_t read_MOR; | |
read_MOR = PMC->CKGR_MOR; | |
read_MOR &= ~CKGR_MOR_MOSCXTEN; /* disable main xtal osc */ | |
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37u) | read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Enable internal 4/8/12MHz fast RC as main clock input. | |
* | |
* \param freqSelect fast RC frequency (FAST_RC_4MHZ, FAST_RC_8MHZ, FAST_RC_12MHZ). | |
*/ | |
extern void PMC_EnableIntRC4_8_12MHz(uint32_t freqSelect) | |
{ | |
uint32_t read_MOR; | |
/* Before switching MAIN OSC on RC OSC : enable it and don't disable | |
* at the same time external crystal in case of if MAIN OSC is still using external crystal | |
*/ | |
read_MOR = PMC->CKGR_MOR; | |
read_MOR &= ~CKGR_MOR_MOSCRCF_Msk; /* reset MOSCRCF field in MOR register before select RC 12MHz */ | |
read_MOR |= (CKGR_MOR_KEY(0x37u) | | |
freqSelect | | |
CKGR_MOR_MOSCXTEN | | |
CKGR_MOR_MOSCRCEN | | |
CKGR_MOR_MOSCXTST(PmcFastRcCnt)); /* enable external crystal - enable RC OSC */ | |
PMC->CKGR_MOR = read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MOSCRCS ) ); /* wait end of RC oscillator stabilization */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
read_MOR &= ~CKGR_MOR_MOSCSEL; /* select internal fast RC */ | |
PMC->CKGR_MOR = read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MOSCSELS ) ); /* Wait end of Main Oscillator Selection */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Disable internal 4/8/12MHz fast RC. | |
*/ | |
extern void PMC_DisableIntRC4_8_12MHz(void) | |
{ | |
uint32_t read_MOR; | |
read_MOR = PMC->CKGR_MOR; | |
read_MOR &= ~CKGR_MOR_MOSCRCF_Msk; /* reset MOSCRCF field in MOR register */ | |
read_MOR &= ~CKGR_MOR_MOSCRCEN; /* disable fast RC */ | |
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37u) | read_MOR; | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
} | |
/** | |
* \brief Configure PLLA clock by giving MUL and DIV. | |
* Disable PLLA when 'mul' set to 0. | |
* | |
* \param mul PLL multiplier factor. | |
* \param div PLL divider factor. | |
*/ | |
extern void PMC_SetPllaClock(uint32_t mul, uint32_t div) | |
{ | |
if (mul != 0) | |
{ | |
/* Init PLL speed */ | |
PMC->CKGR_PLLAR = CKGR_PLLAR_STUCKTO1 | | |
CKGR_PLLAR_PLLACOUNT(PmcPllaCnt) | | |
CKGR_PLLAR_MULA(mul - 1) | | |
CKGR_PLLAR_DIVA(div); | |
/* Wait for PLL stabilization */ | |
while( !(PMC->PMC_SR & PMC_SR_LOCKA) ); | |
} | |
else | |
{ | |
PMC->CKGR_PLLAR = CKGR_PLLAR_STUCKTO1; /* disable PLL A */ | |
} | |
} | |
/** | |
* \brief Enable UPLL clock. | |
*/ | |
extern void PMC_EnableUpllClock(void) | |
{ | |
PMC->CKGR_UCKR = CKGR_UCKR_UPLLCOUNT(PmcUpllCnt) | CKGR_UCKR_UPLLEN; | |
/* Wait UTMI PLL Lock Status */ | |
while (!(PMC->PMC_SR & PMC_SR_LOCKU)); | |
} | |
/** | |
* \brief Disable UPLL clock. | |
*/ | |
extern void PMC_DisableUpllClock(void) | |
{ | |
PMC->CKGR_UCKR &= ~CKGR_UCKR_UPLLEN; | |
} | |
/** | |
* \brief Selection of Master Clock. | |
* | |
* \param clockSource Master Clock source. | |
* \param prescaler Master Clock prescaler. | |
* | |
* \note | |
* The PMC_MCKR register must not be programmed in a single write | |
* operation (see. Product Data Sheet). | |
*/ | |
extern void PMC_SetMckSelection(uint32_t clockSource, uint32_t prescaler) | |
{ | |
switch ( clockSource ) | |
{ | |
case PMC_MCKR_CSS_SLOW_CLK : | |
_PMC_SwitchMck2SlowClock(); | |
_PMC_SetMckPrescaler(prescaler); | |
break; | |
case PMC_MCKR_CSS_MAIN_CLK : | |
_PMC_SwitchMck2MainClock(); | |
_PMC_SetMckPrescaler(prescaler); | |
break; | |
case PMC_MCKR_CSS_PLLA_CLK : | |
_PMC_SetMckPrescaler(prescaler); | |
_PMC_SwitchMck2PllaClock(); | |
break ; | |
case PMC_MCKR_CSS_UPLL_CLK : | |
_PMC_SetMckPrescaler(prescaler); | |
_PMC_SwitchMck2UpllClock(); | |
break ; | |
} | |
} | |
/** | |
* \brief Disable all clocks. | |
*/ | |
extern void PMC_DisableAllClocks(void) | |
{ | |
uint32_t read_reg; | |
PMC->PMC_SCDR = PMC_SCDR_PCK0 | PMC_SCDR_PCK1 | PMC_SCDR_PCK2; /* disable PCK */ | |
_PMC_SwitchMck2MainClock(); | |
PMC->CKGR_PLLAR = PMC->CKGR_PLLAR & ~CKGR_PLLAR_MULA_Msk; /* disable PLL A */ | |
_PMC_SwitchMck2SlowClock(); | |
read_reg = PMC->CKGR_MOR; | |
read_reg = (read_reg & ~CKGR_MOR_MOSCRCEN) | CKGR_MOR_KEY(0x37u); /* disable RC OSC */ | |
PMC->CKGR_MOR = read_reg; | |
PMC_DisableAllPeripherals(); /* disable all peripheral clocks */ | |
} | |
/** | |
* \brief Configure PLLA as clock input for MCK. | |
* | |
* \param mul PLL multiplier factor (not shifted, don't minus 1). | |
* \param div PLL divider factor (not shifted). | |
* \param prescaler Master Clock prescaler (shifted as in register). | |
*/ | |
extern void PMC_ConfigureMckWithPlla(uint32_t mul, uint32_t div, uint32_t prescaler) | |
{ | |
/* First, select Main OSC as input clock for MCK */ | |
_PMC_SwitchMck2MainClock(); | |
/* Then, Set PLLA clock */ | |
PMC_SetPllaClock(mul, div); | |
/* Wait until the master clock is established for the case we already turn on the PLL */ | |
while( !(PMC->PMC_SR & PMC_SR_MCKRDY) ); | |
/* Finally, select PllA as input clock for MCK */ | |
PMC_SetMckSelection(PMC_MCKR_CSS_PLLA_CLK, prescaler); | |
} | |