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/**
* @file irq.c
*
* @ingroup raspberrypi_interrupt
*
* @brief Interrupt support.
*/
/*
* Copyright (c) 2014 Andre Marques <andre.lousa.marques at gmail.com>
*
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#include <rtems/score/armv4.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <bsp/irq-generic.h>
#include <bsp/raspberrypi.h>
#include <bsp/linker-symbols.h>
#include <bsp/mmu.h>
#include <rtems/bspIo.h>
/*
** This sets the main exception vectors
*/
void raspberrypi_set_exception_handler(
Arm_symbolic_exception_name exception,
void (*handler)(void)
)
{
if ((unsigned) exception < MAX_EXCEPTIONS)
{
uint32_t *table = (uint32_t *) bsp_section_vector_begin + MAX_EXCEPTIONS;
table [exception] = (uint32_t) handler;
}
}
/*
** Determine the source of the interrupt and dispatch the correct handler.
*/
void bsp_interrupt_dispatch(void)
{
rtems_vector_number vector = 255;
/* ARM timer */
if ( BCM2835_REG(BCM2835_IRQ_BASIC) & 0x1 )
{
vector = BCM2835_IRQ_ID_TIMER_0;
}
/* UART 0 */
else if ( BCM2835_REG(BCM2835_IRQ_BASIC) & BCM2835_BIT(19) )
{
vector = BCM2835_IRQ_ID_UART;
}
/* GPIO 0*/
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(17) )
{
vector = BCM2835_IRQ_ID_GPIO_0;
}
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(18) )
{
vector = BCM2835_IRQ_ID_GPIO_1;
}
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(19) )
{
vector = BCM2835_IRQ_ID_GPIO_2;
}
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(20) )
{
vector = BCM2835_IRQ_ID_GPIO_3;
}
/* I2C */
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(21) )
{
vector = BCM2835_IRQ_ID_I2C;
}
/* SPI */
else if ( BCM2835_REG(BCM2835_IRQ_PENDING2) & BCM2835_BIT(22) )
{
vector = BCM2835_IRQ_ID_SPI;
}
/* USB */
else if ( BCM2835_REG(BCM2835_IRQ_PENDING1) & BCM2835_BIT(9) )
{
vector = BCM2835_IRQ_ID_USB;
}
if ( vector < 255 )
{
bsp_interrupt_handler_dispatch(vector);
}
}
rtems_status_code bsp_interrupt_vector_enable(rtems_vector_number vector)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
/* ARM Timer */
if ( vector == BCM2835_IRQ_ID_TIMER_0 )
{
BCM2835_REG(BCM2835_IRQ_ENABLE_BASIC) = 0x1;
}
/* UART 0 */
else if ( vector == BCM2835_IRQ_ID_UART )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(25);
}
/* GPIO 0 */
else if ( vector == BCM2835_IRQ_ID_GPIO_0 )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(17);
}
/* GPIO 1 */
else if ( vector == BCM2835_IRQ_ID_GPIO_1 )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(18);
}
/* GPIO 2 */
else if ( vector == BCM2835_IRQ_ID_GPIO_2 )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(19);
}
/* GPIO 3 */
else if ( vector == BCM2835_IRQ_ID_GPIO_3 )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(20);
}
/* I2C */
else if ( vector == BCM2835_IRQ_ID_I2C )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(21);
}
/* SPI */
else if ( vector == BCM2835_IRQ_ID_SPI )
{
BCM2835_REG(BCM2835_IRQ_ENABLE2) = BCM2835_BIT(22);
}
/* USB */
else if ( vector == BCM2835_IRQ_ID_USB )
{
BCM2835_REG(BCM2835_IRQ_ENABLE1) = BCM2835_BIT(9);
}
rtems_interrupt_enable(level);
return RTEMS_SUCCESSFUL;
}
rtems_status_code bsp_interrupt_vector_disable(rtems_vector_number vector)
{
rtems_interrupt_level level;
rtems_interrupt_disable(level);
if ( vector == BCM2835_IRQ_ID_TIMER_0 )
{
BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0x1;
}
else if ( vector == BCM2835_IRQ_ID_UART )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(25);
}
/* GPIO 0 */
else if ( vector == BCM2835_IRQ_ID_GPIO_0 )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(17);
}
/* GPIO 1 */
else if ( vector == BCM2835_IRQ_ID_GPIO_1 )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(18);
}
/* GPIO 2 */
else if ( vector == BCM2835_IRQ_ID_GPIO_2 )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(19);
}
/* GPIO 3 */
else if ( vector == BCM2835_IRQ_ID_GPIO_3 )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(20);
}
/* I2C */
else if ( vector == BCM2835_IRQ_ID_I2C )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(21);
}
/* SPI */
else if ( vector == BCM2835_IRQ_ID_SPI )
{
BCM2835_REG(BCM2835_IRQ_DISABLE2) = BCM2835_BIT(22);
}
/* USB */
else if ( vector == BCM2835_IRQ_ID_USB )
{
BCM2835_REG(BCM2835_IRQ_DISABLE1) = BCM2835_BIT(9);
}
rtems_interrupt_enable(level);
return RTEMS_SUCCESSFUL;
}
void bsp_interrupt_handler_default(rtems_vector_number vector)
{
printk("spurious interrupt: %lu\n", vector);
}
rtems_status_code bsp_interrupt_facility_initialize(void)
{
raspberrypi_set_exception_handler(ARM_EXCEPTION_IRQ, _ARMV4_Exception_interrupt);
BCM2835_REG(BCM2835_IRQ_DISABLE1) = 0xffffffff;
BCM2835_REG(BCM2835_IRQ_DISABLE2) = 0xffffffff;
BCM2835_REG(BCM2835_IRQ_DISABLE_BASIC) = 0xffffffff;
BCM2835_REG(BCM2835_IRQ_FIQ_CTRL) = 0;
return RTEMS_SUCCESSFUL;
}
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