Add function to change fract dividers
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2466 42af7a65-404d-4744-a932-0658087f49c3
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@ -50,7 +50,7 @@ CGU_CSRCS = lpc313x_bcrndx.c lpc313x_clkdomain.c lpc313x_clkexten.c \
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lpc313x_clkfreq.c lpc313x_clkinit.c lpc313x_defclk.c \
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lpc313x_esrndx.c lpc313x_fdcndx.c lpc313x_fdivinit.c \
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lpc313x_freqin.c lpc313x_pllconfig.c lpc313x_resetclks.c \
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lpc313x_setfreqin.c lpc313x_softreset.c
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lpc313x_setfreqin.c lpc313x_setfdiv.c lpc313x_softreset.c
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CHIP_ASRCS = $(CGU_ASRCS)
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CHIP_CSRCS = lpc313x_allocateheap.c lpc313x_boot.c lpc313x_irq.c \
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@ -646,7 +646,9 @@ EXTERN void lpc313x_clkinit(const struct lpc313x_clkinit_s* cfg);
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* Name: lpc313x_fdivinit
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*
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* Description:
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* Enable and configure (or disable) a fractional divider.
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* Enable and configure (or disable) a fractional divider. For
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* internal us only... see lpc313x_setfdiv() the externally usable
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* function.
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*
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************************************************************************/
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@ -654,6 +656,19 @@ EXTERN uint32_t lpc313x_fdivinit(int fdcndx,
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const struct lpc313x_fdivconfig_s *fdiv,
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bool enable);
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/************************************************************************
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* Name: lpc313x_setfdiv
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*
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* Description:
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* Set/reset subdomain frequency containing the specified clock using
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* the provided divider settings
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*
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************************************************************************/
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EXTERN void lpc313x_setfdiv(enum lpc313x_domainid_e dmnid,
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enum lpc313x_clockid_e clkid,
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const struct lpc313x_subdomainconfig_s *fdiv);
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/****************************************************************************
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* Name: lpc313x_pllconfig
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*
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135
arch/arm/src/lpc313x/lpc313x_setfdiv.c
Executable file
135
arch/arm/src/lpc313x/lpc313x_setfdiv.c
Executable file
@ -0,0 +1,135 @@
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/****************************************************************************
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* arch/arm/src/lpc313x/lpc313x_setfdiv.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <arch/board/board.h>
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#include "lpc313x_cgu.h"
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#include "lpc313x_cgudrvr.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: lpc313x_setfdiv
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*
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* Description:
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* Set/reset subdomain frequency containing the specified clock using the
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* provided divider settings
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*
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****************************************************************************/
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void lpc313x_setfdiv(enum lpc313x_domainid_e dmnid,
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enum lpc313x_clockid_e clkid,
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const struct lpc313x_subdomainconfig_s *fdiv)
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{
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uint32_t regaddr;
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unsigned int basefreq;
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int fdcndx;
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int bcrndx;
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/* Get the frequency divider associated with this clock */
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fdcndx = lpc313x_fdcndx(clkid, dmnid);
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/* Does this clock have a frequency divicer? */
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if (fdcndx != FDCNDX_INVALID)
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{
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/* Yes.. Save the current reference frequency selection */
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regaddr = LPC313X_CGU_SSR_OFFSET((int)dmnid);
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basefreq = (getreg32(regaddr) & CGU_SSR_FS_MASK) >> CGU_SSR_FS_SHIFT;
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/* Switch domain to FFAST input */
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lpc313x_selectfreqin(dmnid, CGU_FS_FFAST);
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/* Get the index of the associated BCR register. Does this domain
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* have a BCR?
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*/
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bcrndx = lp313x_bcrndx(dmnid);
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if (bcrndx != BCRNDX_INVALID)
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{
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/* Yes... Disable the BCR */
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regaddr = LPC313X_CGU_BCR(bcrndx);
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putreg32(0, regaddr);
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}
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/* Change fractional divider to the provided settings */
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lpc313x_fdivinit(fdcndx, fdiv, true);
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/* Re-enable the BCR (if one is associated with this domain) */
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if (bcrndx != BCRNDX_INVALID)
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{
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regaddr = LPC313X_CGU_BCR(bcrndx);
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putreg32(CGU_BCR_FDRUN, regaddr);
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}
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/* Switch the domain back to its original base frequency */
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lpc313x_selectfreqin(dmnid, basefreq);
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}
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}
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