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nuttx/arch/arm/src/efm32/efm32_irq.c
Gregory Nutt 1bfec65ac5 More framework for GPIO interrupt support
2014-10-18 14:05:07 -06:00

615 lines
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/****************************************************************************
* arch/arm/src/efm32/efm32_irq.c
*
* Copyright (C) 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 <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <arch/irq.h>
#include "nvic.h"
#include "ram_vectors.h"
#include "up_arch.h"
#include "sched/sched.h"
#include "up_internal.h"
#include "chip.h"
#include "efm32_gpio.h"
/****************************************************************************
* Pre-processor 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)
/* Given the address of a NVIC ENABLE register, this is the offset to
* the corresponding CLEAR ENABLE register.
*/
#define NVIC_ENA_OFFSET (0)
#define NVIC_CLRENA_OFFSET (NVIC_IRQ0_31_CLEAR - NVIC_IRQ0_31_ENABLE)
/****************************************************************************
* Public Data
****************************************************************************/
volatile uint32_t *current_regs;
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: efm32_dumpnvic
*
* Description:
* Dump some interesting NVIC registers
*
****************************************************************************/
#if defined(CONFIG_DEBUG_IRQ)
static void efm32_dumpnvic(const char *msg, int irq)
{
irqstate_t flags;
flags = irqsave();
lldbg("NVIC (%s, irq=%d):\n", msg, irq);
lldbg(" INTCTRL: %08x VECTAB: %08x\n",
getreg32(NVIC_INTCTRL), getreg32(NVIC_VECTAB));
lldbg(" SYSH ENABLE MEMFAULT: %08x BUSFAULT: %08x USGFAULT: %08x SYSTICK: %08x\n",
getreg32(NVIC_SYSHCON_MEMFAULTENA), getreg32(NVIC_SYSHCON_BUSFAULTENA),
getreg32(NVIC_SYSHCON_USGFAULTENA), getreg32(NVIC_SYSTICK_CTRL_ENABLE));
lldbg(" IRQ ENABLE: %08x %08x %08x\n",
getreg32(NVIC_IRQ0_31_ENABLE), getreg32(NVIC_IRQ32_63_ENABLE),
getreg32(NVIC_IRQ64_95_ENABLE));
lldbg(" SYSH_PRIO: %08x %08x %08x\n",
getreg32(NVIC_SYSH4_7_PRIORITY), getreg32(NVIC_SYSH8_11_PRIORITY),
getreg32(NVIC_SYSH12_15_PRIORITY));
lldbg(" IRQ PRIO: %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ0_3_PRIORITY), getreg32(NVIC_IRQ4_7_PRIORITY),
getreg32(NVIC_IRQ8_11_PRIORITY), getreg32(NVIC_IRQ12_15_PRIORITY));
lldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ16_19_PRIORITY), getreg32(NVIC_IRQ20_23_PRIORITY),
getreg32(NVIC_IRQ24_27_PRIORITY), getreg32(NVIC_IRQ28_31_PRIORITY));
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 32)
lldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ32_35_PRIORITY), getreg32(NVIC_IRQ36_39_PRIORITY),
getreg32(NVIC_IRQ40_43_PRIORITY), getreg32(NVIC_IRQ44_47_PRIORITY));
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 48)
lldbg(" %08x %08x %08x %08x\n",
getreg32(NVIC_IRQ48_51_PRIORITY), getreg32(NVIC_IRQ52_55_PRIORITY),
getreg32(NVIC_IRQ56_59_PRIORITY), getreg32(NVIC_IRQ60_63_PRIORITY));
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 64)
lldbg(" %08x\n",
getreg32(NVIC_IRQ64_67_PRIORITY));
#endif
#endif
#endif
irqrestore(flags);
}
#else
# define efm32_dumpnvic(msg, irq)
#endif
/****************************************************************************
* Name: efm32_nmi, efm32_busfault, efm32_usagefault, efm32_pendsv,
* efm32_dbgmonitor, efm32_pendsv, efm32_reserved
*
* Description:
* Handlers for various exceptions. 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 efm32_nmi(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! NMI received\n");
PANIC();
return 0;
}
static int efm32_busfault(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Bus fault received: %08x\n", getreg32(NVIC_CFAULTS));
PANIC();
return 0;
}
static int efm32_usagefault(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Usage fault received: %08x\n", getreg32(NVIC_CFAULTS));
PANIC();
return 0;
}
static int efm32_pendsv(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! PendSV received\n");
PANIC();
return 0;
}
static int efm32_dbgmonitor(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Debug Monitor received\n");
PANIC();
return 0;
}
static int efm32_reserved(int irq, FAR void *context)
{
(void)irqsave();
dbg("PANIC!!! Reserved interrupt\n");
PANIC();
return 0;
}
#endif
/****************************************************************************
* Name: efm32_prioritize_syscall
*
* Description:
* Set the priority of an exception. This function may be needed
* internally even if support for prioritized interrupts is not enabled.
*
****************************************************************************/
#ifdef CONFIG_ARMV7M_USEBASEPRI
static inline void efm32_prioritize_syscall(int priority)
{
uint32_t regval;
/* SVCALL is system handler 11 */
regval = getreg32(NVIC_SYSH8_11_PRIORITY);
regval &= ~NVIC_SYSH_PRIORITY_PR11_MASK;
regval |= (priority << NVIC_SYSH_PRIORITY_PR11_SHIFT);
putreg32(regval, NVIC_SYSH8_11_PRIORITY);
}
#endif
/****************************************************************************
* Name: efm32_irqinfo
*
* Description:
* Given an IRQ number, provide the register and bit setting to enable or
* disable the irq.
*
****************************************************************************/
static int efm32_irqinfo(int irq, uintptr_t *regaddr, uint32_t *bit,
uintptr_t offset)
{
DEBUGASSERT(irq >= EFM32_IRQ_NMI && irq < NR_IRQS);
/* Check for external interrupt or (a second level GPIO interrupt) */
if (irq >= EFM32_IRQ_INTERRUPTS)
{
/* Is this an external interrupt? */
if (irq < NR_VECTORS)
{
/* Yes.. We have support implemented for vectors 0-95 */
DEBUGASSERT(irq < (EFM32_IRQ_INTERRUPTS + 96));
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 32)
/* Check for vectors 0-31 */
if (irq < EFM32_IRQ_INTERRUPTS + 32)
#endif
{
*regaddr = (NVIC_IRQ0_31_ENABLE + offset);
*bit = 1 << (irq - EFM32_IRQ_INTERRUPTS);
}
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 32)
/* Yes.. Check for vectors 32-63 */
else
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 64)
if (irq < EFM32_IRQ_INTERRUPTS + 64)
#endif
{
*regaddr = (NVIC_IRQ32_63_ENABLE + offset);
*bit = 1 << (irq - EFM32_IRQ_INTERRUPTS - 32);
}
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 64)
/* Yes.. Check for vectors 64-95 */
else
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 96)
/* Yes.. Check for vectors 64-95 */
if (irq < NR_VECTORS)
#endif
{
*regaddr = (NVIC_IRQ64_95_ENABLE + offset);
*bit = 1 << (irq - EFM32_IRQ_INTERRUPTS - 64);
}
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 96)
else
{
return -EINVAL; /* We should never get here */
}
#endif
#endif
#endif
}
else
{
return -EINVAL; /* Invalid interrupt */
}
}
/* Handle processor exceptions. Only a few can be disabled */
else
{
*regaddr = NVIC_SYSHCON;
if (irq == EFM32_IRQ_MEMFAULT)
{
*bit = NVIC_SYSHCON_MEMFAULTENA;
}
else if (irq == EFM32_IRQ_BUSFAULT)
{
*bit = NVIC_SYSHCON_BUSFAULTENA;
}
else if (irq == EFM32_IRQ_USAGEFAULT)
{
*bit = NVIC_SYSHCON_USGFAULTENA;
}
else if (irq == EFM32_IRQ_SYSTICK)
{
*regaddr = NVIC_SYSTICK_CTRL;
*bit = NVIC_SYSTICK_CTRL_ENABLE;
}
else
{
return -EINVAL; /* Invalid or unsupported exception */
}
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_irqinitialize
****************************************************************************/
void up_irqinitialize(void)
{
uint32_t regaddr;
int num_priority_registers;
/* Disable all interrupts */
putreg32(0, NVIC_IRQ0_31_ENABLE);
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 32)
putreg32(0, NVIC_IRQ32_63_ENABLE);
#if NR_VECTORS >= (EFM32_IRQ_INTERRUPTS + 64)
putreg32(0, NVIC_IRQ64_95_ENABLE);
#endif
#endif
#if defined(CONFIG_DEBUG_STACK) && CONFIG_ARCH_INTERRUPTSTACK > 3
/* Colorize the interrupt stack for debug purposes */
{
size_t intstack_size = (CONFIG_ARCH_INTERRUPTSTACK & ~3);
up_stack_color((FAR void *)((uintptr_t)&g_intstackbase - intstack_size),
intstack_size);
}
#endif
#ifdef CONFIG_ARCH_RAMVECTORS
/* If CONFIG_ARCH_RAMVECTORS is defined, then we are using a RAM-based
* vector table that requires special initialization.
*/
up_ramvec_initialize();
#endif
/* Set all interrupts (and exceptions) to the default priority */
putreg32(DEFPRIORITY32, NVIC_SYSH4_7_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_SYSH8_11_PRIORITY);
putreg32(DEFPRIORITY32, NVIC_SYSH12_15_PRIORITY);
/* The NVIC ICTR register (bits 0-4) holds the number of of interrupt
* lines that the NVIC supports:
*
* 0 -> 32 interrupt lines, 8 priority registers
* 1 -> 64 " " " ", 16 priority registers
* 2 -> 96 " " " ", 32 priority registers
* ...
*/
num_priority_registers = (getreg32(NVIC_ICTR) + 1) * 8;
/* Now set all of the interrupt lines to the default priority */
regaddr = NVIC_IRQ0_3_PRIORITY;
while (num_priority_registers--)
{
putreg32(DEFPRIORITY32, regaddr);
regaddr += 4;
}
/* 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(EFM32_IRQ_SVCALL, up_svcall);
irq_attach(EFM32_IRQ_HARDFAULT, up_hardfault);
/* Set the priority of the SVCall interrupt */
#ifdef CONFIG_ARMV7M_USEBASEPRI
efm32_prioritize_syscall(NVIC_SYSH_SVCALL_PRIORITY);
#endif
/* If the MPU is enabled, then attach and enable the Memory Management
* Fault handler.
*/
#ifdef CONFIG_ARMV7M_MPU
irq_attach(EFM32_IRQ_MEMFAULT, up_memfault);
up_enable_irq(EFM32_IRQ_MEMFAULT);
#endif
/* Attach all other processor exceptions (except reset and sys tick) */
#ifdef CONFIG_DEBUG
irq_attach(EFM32_IRQ_NMI, efm32_nmi);
#ifndef CONFIG_ARMV7M_MPU
irq_attach(EFM32_IRQ_MEMFAULT, up_memfault);
#endif
irq_attach(EFM32_IRQ_BUSFAULT, efm32_busfault);
irq_attach(EFM32_IRQ_USAGEFAULT, efm32_usagefault);
irq_attach(EFM32_IRQ_PENDSV, efm32_pendsv);
irq_attach(EFM32_IRQ_DBGMONITOR, efm32_dbgmonitor);
irq_attach(EFM32_IRQ_RESERVED, efm32_reserved);
#endif
efm32_dumpnvic("initial", NR_VECTORS);
#ifndef CONFIG_SUPPRESS_INTERRUPTS
#ifdef CONFIG_EFM32_GPIO_IRQ
/* Initialize logic to support a second level of interrupt decoding for
* GPIO pins.
*/
efm32_gpioirqinitialize();
#endif
/* And finally, enable interrupts */
irqenable();
#endif
}
/****************************************************************************
* Name: up_disable_irq
*
* Description:
* Disable the IRQ specified by 'irq'
*
****************************************************************************/
void up_disable_irq(int irq)
{
uintptr_t regaddr;
uint32_t regval;
uint32_t bit;
if (efm32_irqinfo(irq, &regaddr, &bit, NVIC_CLRENA_OFFSET) == 0)
{
/* Modify the appropriate bit in the register to disable the interrupt.
* For normal interrupts, we need to set the bit in the associated
* Interrupt Clear Enable register. For other exceptions, we need to
* clear the bit in the System Handler Control and State Register.
*/
if (irq >= EFM32_IRQ_INTERRUPTS)
{
putreg32(bit, regaddr);
}
else
{
regval = getreg32(regaddr);
regval &= ~bit;
putreg32(regval, regaddr);
}
}
#ifdef CONFIG_EFM32_GPIO_IRQ
else
{
/* Maybe it is a (derived) GPIO IRQ */
efm32_gpioirqdisable(irq);
}
#endif
efm32_dumpnvic("disable", irq);
}
/****************************************************************************
* Name: up_enable_irq
*
* Description:
* Enable the IRQ specified by 'irq'
*
****************************************************************************/
void up_enable_irq(int irq)
{
uintptr_t regaddr;
uint32_t regval;
uint32_t bit;
if (efm32_irqinfo(irq, &regaddr, &bit, NVIC_ENA_OFFSET) == 0)
{
/* Modify the appropriate bit in the register to enable the interrupt.
* For normal interrupts, we need to set the bit in the associated
* Interrupt Set Enable register. For other exceptions, we need to
* set the bit in the System Handler Control and State Register.
*/
if (irq >= EFM32_IRQ_INTERRUPTS)
{
putreg32(bit, regaddr);
}
else
{
regval = getreg32(regaddr);
regval |= bit;
putreg32(regval, regaddr);
}
}
#ifdef CONFIG_EFM32_GPIO_IRQ
else
{
/* Maybe it is a (derived) PIO IRQ */
efm32_gpioirqenable(irq);
}
#endif
efm32_dumpnvic("enable", irq);
}
/****************************************************************************
* Name: up_ack_irq
*
* Description:
* Acknowledge the IRQ
*
****************************************************************************/
void up_ack_irq(int 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 >= EFM32_IRQ_MEMFAULT && irq < NR_VECTORS &&
(unsigned)priority <= NVIC_SYSH_PRIORITY_MIN);
if (irq < EFM32_IRQ_INTERRUPTS)
{
/* NVIC_SYSH_PRIORITY() maps {0..15} to one of three priority
* registers (0-3 are invalid)
*/
regaddr = NVIC_SYSH_PRIORITY(irq);
irq -= 4;
}
else (irq < NR_VECTORS)
{
/* NVIC_IRQ_PRIORITY() maps {0..} to one of many priority registers */
irq -= EFM32_IRQ_INTERRUPTS;
regaddr = NVIC_IRQ_PRIORITY(irq);
}
else
{
/* Must be a GPIO interrupt */
return -EINVAL;
}
regval = getreg32(regaddr);
shift = ((irq & 3) << 3);
regval &= ~(0xff << shift);
regval |= (priority << shift);
putreg32(regval, regaddr);
efm32_dumpnvic("prioritize", irq);
return OK;
}
#endif
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