135 lines
4.6 KiB
C
135 lines
4.6 KiB
C
/************************************************************************
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* arch/arm/src/lpc31xx/lpc31_esrndx.c
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*
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* Copyright (C) 2009-2010 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* References:
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* - UM10314 LPC3130/31 User manual Rev. 1.01 — 9 September 2009
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* - lpc313x.cdl.drivers.zip example driver code
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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 "up_arch.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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* 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_esrndx
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*
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* Description:
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* Given a clock ID, return the index of the corresponding ESR
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* register (or ESRNDX_INVALID if there is no ESR associated with
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* this clock ID). Indexing of ESRs differs slightly from the clock
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* ID: There are 92 clock IDs but only 89 ESR regisers. There are no
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* ESR registers for :
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*
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*
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* CLKID_I2SRXBCK0 Clock ID 87: I2SRX_BCK0
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* CLKID_I2SRXBCK1, Clock ID 88: I2SRX_BCK1
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*
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* and
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*
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* CLKID_SYSCLKO Clock ID 91: SYSCLK_O
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*
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************************************************************************/
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int lpc31_esrndx(enum lpc31_clockid_e clkid)
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{
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int esrndx = (int)clkid;
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/* There ar 89 Enable Select Registers (ESR). Indexing for these
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* registers is identical to indexing to other registers (like PCR),
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* except that there are no ESR registers for
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*
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*
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* CLKID_I2SRXBCK0 Clock ID 87: I2SRX_BCK0
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* CLKID_I2SRXBCK1, Clock ID 88: I2SRX_BCK1
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*
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* and
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*
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* CLKID_SYSCLKO Clock ID 91: SYSCLK_O
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*/
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switch (clkid)
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{
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/* There are no ESR registers corresponding to the following
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* three clocks:
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*/
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case CLKID_I2SRXBCK0:
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case CLKID_I2SRXBCK1:
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case CLKID_SYSCLKO:
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esrndx = ESRNDX_INVALID;
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break;
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/* These clock IDs are a special case and need to be adjusted
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* by two:
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*
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* CLKID_SPICLK Clock ID 89, ESR index 87
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* CLKID_SPICLKGATED Clock ID 90, ESR index 88
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*/
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case CLKID_SPICLK:
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case CLKID_SPICLKGATED:
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esrndx = esrndx - 2;
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break;
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/* The rest of the indices match up and we don't have to do anything. */
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default:
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break;
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}
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return esrndx;
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}
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