/****************************************************************************
* arch/arm/src/kinetis/kinetis_pindma.c
*
* Copyright (C) 2011 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 <arch/board/board.h>
#include <nuttx/config.h>
#include <nuttx/arch.h>
#include "up_internal.h"
#ifdef CONFIG_KINETIS_DMA
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/************************************************************************************
* Name: kinetis_pindmaenable
*
* Description:
* Enable DMA for specified pin
*
************************************************************************************/
void kinetis_pindmaenable(uint32_t pinset)
{
uintptr_t base;
uint32_t regval;
unsigned int port;
unsigned int pin;
/* Get the port number and pin number */
port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
DEBUGASSERT(port < KINETIS_NPORTS);
if (port < KINETIS_NPORTS)
{
/* Modify the IRQC field of the port PCR register in order to enable DMA. */
regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
regval &= ~PORT_PCR_IRQC_MASK;
switch (pinset & _PIN_INT_MASK)
{
case PIN_DMA_RISING : /* DMA Request on rising edge */
regval |= PORT_PCR_IRQC_DMARISING;
break;
case PIN_DMA_FALLING : /* DMA Request on falling edge */
regval |= PORT_PCR_IRQC_DMAFALLING;
break;
case PIN_DMA_BOTH : /* DMA Request on either edge */
regval |= PORT_PCR_IRQC_DMABOTH;
break;
default:
return;
}
putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
}
}
/************************************************************************************
* Name: kinetis_pindmadisable
*
* Description:
* Disable DMA for specified pin
*
************************************************************************************/
void kinetis_pindmadisable(uint32_t pinset)
{
uintptr_t base;
uint32_t regval;
unsigned int port;
unsigned int pin;
/* Get the port number and pin number */
port = (pinset & _PIN_PORT_MASK) >> _PIN_PORT_SHIFT;
pin = (pinset & _PIN_MASK) >> _PIN_SHIFT;
DEBUGASSERT(port < KINETIS_NPORTS);
if (port < KINETIS_NPORTS)
{
/* Clear the IRQC field of the port PCR register in order to disable DMA. */
regval = getreg32(base + KINETIS_PORT_PCR_OFFSET(pin));
regval &= ~PORT_PCR_IRQC_MASK;
putreg32(regval, base + KINETIS_PORT_PCR_OFFSET(pin));
}
}
#endif
