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/****************************************************************************
* arch/arm/src/lpc313x/lpc313x_setfreqin.c
*
* Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* References:
* - NXP UM10314 LPC3130/31 User manual Rev. 1.01 � 9 September 2009
* - NXP lpc313x.cdl.drivers.zip example driver code
*
* 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. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <arch/board/board.h>
#include "lpc313x_cgudrvr.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lpc313x_selectfreqin
*
* Description:
* Set the base frequency source selection for with a clock domain
*
****************************************************************************/
void lpc313x_selectfreqin(enum lpc313x_domainid_e dmnid, uint32_t finsel)
{
uint32_t scraddr = LPC313X_CGU_SCR(dmnid);
uint32_t fs1addr = LPC313X_CGU_FS1(dmnid);
uint32_t fs2addr = LPC313X_CGU_FS2(dmnid);
uint32_t scrbits;
/* Get the frequency selection from the switch configuration register (SCR)
* for this domain.
*/
scrbits = getreg32(scraddr) & ~(CGU_SCR_ENF1|CGU_SCR_ENF2);
/* If FS1 is currently enabled set the reference clock to FS2 and enable FS2 */
if ((getreg32(LPC313X_CGU_SSR(dmnid)) & CGU_SSR_FS1STAT) != 0)
{
/* Check if the selected frequency, FS1, is same as requested */
if ((getreg32(fs1addr) & CGU_FS_MASK) != finsel)
{
/* No.. Set up FS2 */
putreg32(finsel, fs2addr);
putreg32(scrbits | CGU_SCR_ENF2, scraddr);
}
}
/* FS1 is not currently enabled, check if the selected frequency, FS2,
* is same as requested
*/
else if ((getreg32(fs2addr) & CGU_FS_MASK) != finsel)
{
/* No.. Set up FS1 */
putreg32(finsel, fs1addr);
putreg32(scrbits | CGU_SCR_ENF1, scraddr);
}
}
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