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119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/****************************************************************************
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* arch/arm/src/lpc31xx/lpc31_defclk.c
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*
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* Copyright (C) 2009 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 "lpc31_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: lpc31_defclk
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*
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* Description:
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* Enable the specified clock if it is one of the default clocks needed
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* by the board.
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*
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****************************************************************************/
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bool lpc31_defclk(enum lpc31_clockid_e clkid)
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{
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uint32_t regaddr;
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uint32_t regval;
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bool enable;
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/* Check if this clock should be enabled. This is determined by
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* 3 bitsets provided by board-specific logic in board/board.h.
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*/
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if ((int)clkid < 32)
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{
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enable = ((BOARD_CLKS_0_31 & (1 << (int)clkid)) != 0);
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}
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else if ((int)clkid < 64)
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{
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enable = ((BOARD_CLKS_32_63 & (1 << ((int)clkid - 32))) != 0);
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}
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else
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{
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enable = ((BOARD_CLKS_64_92 & (1 << ((int)clkid - 64))) != 0);
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}
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/* Then set/clear the RUN bit in the PCR register for this clock
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* accordingly.
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*/
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regaddr = LPC31_CGU_PCR((int)clkid);
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regval = getreg32(regaddr);
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if (enable)
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{
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regval |= CGU_PCR_RUN;
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}
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else
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{
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regval &= ~CGU_PCR_RUN;
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}
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putreg32(regval, regaddr);
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return enable;
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}
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