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/****************************************************************************
* arch/arm/src/lpc313x/lpc313x_defclk.c
*
* Copyright (C) 2009 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <stdbool.h>
#include <arch/board/board.h>
#include "lpc313x_cgudrvr.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: lpc313x_defclk
*
* Description:
* Enable the specified clock if it is one of the default clocks needed
* by the board.
*
****************************************************************************/
bool lpc313x_defclk(enum lpc313x_clockid_e clkid)
{
uint32_t regaddr;
uint32_t regval;
bool enable;
/* Check if this clock should be enabled. This is determined by
* 3 bitsets provided by board-specific logic in board/board.h.
*/
if ((int)clkid < 32)
{
enable = ((BOARD_CLKS_0_31 & (1 << (int)clkid)) != 0);
}
else if ((int)clkid < 64)
{
enable = ((BOARD_CLKS_32_63 & (1 << ((int)clkid - 32))) != 0);
}
else
{
enable = ((BOARD_CLKS_64_92 & (1 << ((int)clkid - 64))) != 0);
}
/* Then set/clear the RUN bit in the PCR register for this clock
* accordingly.
*/
regaddr = LPC313X_CGU_PCR((int)clkid);
regval = getreg32(regaddr);
if (enable)
{
regval |= CGU_PCR_RUN;
}
else
{
regval &= ~CGU_PCR_RUN;
}
putreg32(regval, regaddr);
return enable;
}
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