/****************************************************************************
* arch/arm/src/nuc1xx/nuc_irq.c
*
* Copyright (C) 2009-2014 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 <stdint.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include "nvic.h"
#include "up_arch.h"
#include "up_internal.h"
#include "nuc_irq.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Get a 32-bit version of the default priority */
#define DEFPRIORITY32 \
(NVIC_SYSH_PRIORITY_DEFAULT << 24 | NVIC_SYSH_PRIORITY_DEFAULT << 16 |\
NVIC_SYSH_PRIORITY_DEFAULT << 8 | NVIC_SYSH_PRIORITY_DEFAULT)
/****************************************************************************
* Public Data
****************************************************************************/
volatile uint32_t *current_regs;
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nuc_dumpnvic
*
* Description:
* Dump some interesting NVIC registers
*
****************************************************************************/
#if defined(CONFIG_DEBUG_IRQ)
static void nuc_dumpnvic(const char *msg, int irq)
{
irqstate_t flags;
flags = irqsave();
lldbg("NVIC (%s, irq=%d):\n", msg, irq);
lldbg(" ISER: %08x ICER: %08x\n",
getreg32(ARMV6M_NVIC_ISER), getreg32(ARMV6M_NVIC_ICER));
lldbg(" ISPR: %08x ICPR: %08x\n",
getreg32(ARMV6M_NVIC_ISPR), getreg32(ARMV6M_NVIC_ICPR));
lldbg(" IRQ PRIO: %08x %08x %08x %08x\n",
getreg32(ARMV6M_NVIC_IPR0), getreg32(ARMV6M_NVIC_IPR1),
getreg32(ARMV6M_NVIC_IPR2), getreg32(ARMV6M_NVIC_IPR3));
lldbg(" %08x %08x %08x %08x\n",
getreg32(ARMV6M_NVIC_IPR4), getreg32(ARMV6M_NVIC_IPR5),
getreg32(ARMV6M_NVIC_IPR6), getreg32(ARMV6M_NVIC_IPR7));
lldbg("SYSCON:\n");
lldbg(" CPUID: %08x\n",
getreg32(ARMV6M_SYSCON_CPUID));
lldbg(" ICSR: %08x AIRCR: %08x\n",
getreg32(ARMV6M_SYSCON_ICSR), getreg32(ARMV6M_SYSCON_AIRCR));
lldbg(" SCR: %08x CCR: %08x\n",
getreg32(ARMV6M_SYSCON_SCR), getreg32(ARMV6M_SYSCON_CCR));
lldbg(" SHPR2: %08x SHPR3: %08x\n",
getreg32(ARMV6M_SYSCON_SHPR2), getreg32(ARMV6M_SYSCON_SHPR3));
irqrestore(flags);
}
#else
# define nuc_dumpnvic(msg, irq)
#endif
/****************************************************************************
* Name: nuc_nmi, nuc_busfault, nuc_usagefault, nuc_pendsv,
* nuc_dbgmonitor, nuc_pendsv, nuc_reserved
*
* Description:
* Handlers for various execptions. None are handled and all are fatal
* error conditions. The only advantage these provided over the default
* unexpected interrupt handler is that they provide a diagnostic output.
*
****************************************************************************/
#ifdef CONFIG_DEBUG
static int nuc_nmi(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! NMI received\n");
PANIC();
return 0;
}
static int nuc_pendsv(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! PendSV received\n");
PANIC();
return 0;
}
static int nuc_reserved(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Reserved interrupt\n");
PANIC();
return 0;
}
#endif
/****************************************************************************
* Name: nuc_clrpend
*
* Description:
* Clear a pending interrupt at the NVIC.
*
****************************************************************************/
static inline void nuc_clrpend(int irq)
{
/* This will be called on each interrupt exit whether the interrupt can be
* enambled or not. So this assertion is necessarily lame.
*/
DEBUGASSERT((unsigned)irq < NR_IRQS);
/* Check for an external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 32)
{
/* Set the appropriate bit in the ISER register to enable the
* interrupt
*/
putreg32((1 << (irq - NUC_IRQ_INTERRUPT)), ARMV6M_NVIC_ICPR);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_irqinitialize
****************************************************************************/
void up_irqinitialize(void)
{
uint32_t regaddr;
int i;
/* Disable all interrupts */
putreg32(0xffffffff, ARMV6M_NVIC_ICER);
/* Set all interrupts (and exceptions) to the default priority */
putreg32(DEFPRIORITY32, ARMV6M_SYSCON_SHPR2);
putreg32(DEFPRIORITY32, ARMV6M_SYSCON_SHPR3);
/* Now set all of the interrupt lines to the default priority */
for (i = 0; i < 8; i++)
{
regaddr = ARMV6M_NVIC_IPR(i);
putreg32(DEFPRIORITY32, regaddr);
}
/* currents_regs is non-NULL only while processing an interrupt */
current_regs = NULL;
/* Attach the SVCall and Hard Fault exception handlers. The SVCall
* exception is used for performing context switches; The Hard Fault
* must also be caught because a SVCall may show up as a Hard Fault
* under certain conditions.
*/
irq_attach(NUC_IRQ_SVCALL, up_svcall);
irq_attach(NUC_IRQ_HARDFAULT, up_hardfault);
/* Attach all other processor exceptions (except reset and sys tick) */
#ifdef CONFIG_DEBUG
irq_attach(NUC_IRQ_NMI, nuc_nmi);
irq_attach(NUC_IRQ_PENDSV, nuc_pendsv);
irq_attach(NUC_IRQ_RESERVED, nuc_reserved);
#endif
nuc_dumpnvic("initial", NR_IRQS);
#ifndef CONFIG_SUPPRESS_INTERRUPTS
/* And finally, enable interrupts */
irqenable();
#endif
}
/****************************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
****************************************************************************/
void up_disable_irq(int irq)
{
DEBUGASSERT((unsigned)irq < NR_IRQS);
/* Check for an external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 32)
{
/* Set the appropriate bit in the ICER register to disable the
* interrupt
*/
putreg32((1 << (irq - NUC_IRQ_INTERRUPT)), ARMV6M_NVIC_ICER);
}
/* Handle processor exceptions. Only SysTick can be disabled */
else if (irq == NUC_IRQ_SYSTICK)
{
modifyreg32(ARMV6M_SYSTICK_CSR, SYSTICK_CSR_ENABLE, 0);
}
nuc_dumpnvic("disable", irq);
}
/****************************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
****************************************************************************/
void up_enable_irq(int irq)
{
/* This will be called on each interrupt exit whether the interrupt can be
* enambled or not. So this assertion is necessarily lame.
*/
DEBUGASSERT((unsigned)irq < NR_IRQS);
/* Check for external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 32)
{
/* Set the appropriate bit in the ISER register to enable the
* interrupt
*/
putreg32((1 << (irq - NUC_IRQ_INTERRUPT)), ARMV6M_NVIC_ISER);
}
/* Handle processor exceptions. Only SysTick can be disabled */
else if (irq == NUC_IRQ_SYSTICK)
{
modifyreg32(ARMV6M_SYSTICK_CSR, 0, SYSTICK_CSR_ENABLE);
}
nuc_dumpnvic("enable", irq);
}
/****************************************************************************
* Name: up_ack_irq
*
* Description:
* Acknowledge the IRQ
*
****************************************************************************/
void up_ack_irq(int irq)
{
nuc_clrpend(irq);
}
/****************************************************************************
* Name: up_prioritize_irq
*
* Description:
* Set the priority of an IRQ.
*
* Since this API is not supported on all architectures, it should be
* avoided in common implementations where possible.
*
****************************************************************************/
#ifdef CONFIG_ARCH_IRQPRIO
int up_prioritize_irq(int irq, int priority)
{
uint32_t regaddr;
uint32_t regval;
int shift;
DEBUGASSERT(irq == NUC_IRQ_SVCALL ||
irq == NUC_IRQ_PENDSV ||
irq == NUC_IRQ_SYSTICK ||
(irq >= NUC_IRQ_INTERRUPT && irq < NR_IRQS));
DEBUGASSERT(priority >= NVIC_SYSH_PRIORITY_MAX &&
priority <= NVIC_SYSH_PRIORITY_MIN);
/* Check for external interrupt */
if (irq >= NUC_IRQ_INTERRUPT && irq < NUC_IRQ_INTERRUPT + 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 == NUC_IRQ_PENDSV)
{
regaddr = ARMV6M_SYSCON_SHPR2;
shift = SYSCON_SHPR3_PRI_14_SHIFT;
}
else if (irq == NUC_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);
nuc_dumpnvic("prioritize", irq);
return OK;
}
#endif
