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/****************************************************************************
* arch/arm/src/kl/kl_irqprio.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <sys/types.h>
#include <assert.h>
#include <arch/irq.h>
#include "nvic.h"
#include "up_arch.h"
#include "kl_irq.h"
#ifdef CONFIG_ARCH_IRQPRIO
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
int up_prioritize_irq(int irq, int priority)
{
uint32_t regaddr;
uint32_t regval;
int shift;
DEBUGASSERT(irq == KL_IRQ_SVCALL ||
irq == KL_IRQ_PENDSV ||
irq == KL_IRQ_SYSTICK ||
(irq >= KL_IRQ_EXTINT && irq < NR_IRQS));
DEBUGASSERT(priority >= NVIC_SYSH_PRIORITY_MAX &&
priority <= NVIC_SYSH_PRIORITY_MIN);
/* Check for external interrupt */
if (irq >= KL_IRQ_EXTINT && irq < (KL_IRQ_EXTINT + 32))
{
/* ARMV6M_NVIC_IPR() maps register IPR0-IPR7 with four settings per
* register.
*/
regaddr = ARMV6M_NVIC_IPR(irq >> 2);
shift = (irq & 3) << 3;
}
/* Handle processor exceptions. Only SVCall, PendSV, and SysTick can be
* reprioritized. And we will not permit modification of SVCall through
* this function.
*/
else if (irq == KL_IRQ_PENDSV)
{
regaddr = ARMV6M_SYSCON_SHPR2;
shift = SYSCON_SHPR3_PRI_14_SHIFT;
}
else if (irq == KL_IRQ_SYSTICK)
{
regaddr = ARMV6M_SYSCON_SHPR2;
shift = SYSCON_SHPR3_PRI_15_SHIFT;
}
else
{
return ERROR;
}
/* Set the priority */
regval = getreg32(regaddr);
regval &= ~((uint32_t)0xff << shift);
regval |= ((uint32_t)priority << shift);
putreg32(regval, regaddr);
return OK;
}
#endif
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