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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-30 00:13:31 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-12-30 00:13:31 +0000 |
commit | ad197aab796450a7d27cee6dec2476c037a01bcc (patch) | |
tree | 1c06051a2ecd7a791600a9ef436c57263ab75ea5 /nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c | |
parent | c84a99f6499e05cceb9398cf5e69a2d46dbcfd83 (diff) | |
download | px4-nuttx-ad197aab796450a7d27cee6dec2476c037a01bcc.tar.gz px4-nuttx-ad197aab796450a7d27cee6dec2476c037a01bcc.tar.bz2 px4-nuttx-ad197aab796450a7d27cee6dec2476c037a01bcc.zip |
Add clock reset logic
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2461 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c')
-rwxr-xr-x | nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c b/nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c new file mode 100755 index 000000000..bdef026b5 --- /dev/null +++ b/nuttx/arch/arm/src/lpc313x/lpc313x_defclk.c @@ -0,0 +1,119 @@ +/**************************************************************************** + * 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; +} + |