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/****************************************************************************
* arch/arm/src/stm32/stm32_rcc.c
*
* Copyright (C) 2011 Uros Platise. All rights reserved.
* Author: Author: Uros Platise <uros.platise@isotel.eu>
*
* This file is part of NuttX:
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
*
* 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>
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/* Activity reference count, showing inactivity after start-up.
* Device drivers increment this count using rcclock() and rccunlock()
*
* If this value goes beyond the range [0, MAX_RCCs] indicates
* reference count leakage (asymetric number of locks vs. unlocks) and
* system enters permanent active state.
*/
static int stm32_rcclock_count = 0;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
uint32_t stm32_rcclock(uint8_t domain_id)
{
// THINK:
// maybe just shift domain_id into 32-bit or 64-bit register
// and if there value of this var != 0, we are active...
// increment some variable, so it is possible to test leakage
// multiple locks or multiple unlocks
if (stm32_rcclock_count >= 0)
{
stm32_rcclock_count++;
if (stm32_rcclock_count > 64)
{
stm32_rcclock_count = -1; /* capture error */
}
}
return 0;
}
uint32_t stm32_rccunlock(uint8_t domain_id)
{
if (stm32_rcclock_count > -1)
{
stm32_rcclock_count--;
}
return 0;
}
uint32_t stm32_setrccoptions(uint8_t domain_id, uint32_t options)
{
return 0;
}
int stm32_getrccactivity(void)
{
return stm32_rcclock_count;
}
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