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rt-thread-official/bsp/at91sam9g45/platform/interrupt.c

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/*
* File : interrupt.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2011-01-13 weety first version
*/
#include <rthw.h>
#include "at91sam9g45.h"
#include "interrupt.h"
#define AIC_IRQS 32
#define MAX_HANDLERS (AIC_IRQS + PIN_IRQS)
extern rt_uint32_t rt_interrupt_nest;
/* exception and interrupt handler table */
struct rt_irq_desc irq_desc[MAX_HANDLERS];
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
/* --------------------------------------------------------------------
* Interrupt initialization
* -------------------------------------------------------------------- */
rt_uint32_t at91_extern_irq;
#define is_extern_irq(irq) ((1 << (irq)) & at91_extern_irq)
/*
* The default interrupt priority levels (0 = lowest, 7 = highest).
*/
static rt_uint32_t at91sam9g45_default_irq_priority[MAX_HANDLERS] = {
7, /* Advanced Interrupt Controller - FIQ */
7, /* System Controller Interrupt */
1, /* Parallel I/O Controller A, */
1, /* Parallel I/O Controller B */
1, /* Parallel I/O Controller C */
0, /* Parallel I/O Controller D/E */
5, /* True Random Number Generator */
5, /* USART 0 */
5, /* USART 1 */
0, /* USART 2 */
2, /* USART 3 */
6, /* High Speed Multimedia Card Interface 0 */
5, /* Two-Wire Interface 0 */
5, /* Two-Wire Interface 1 */
5, /* Serial Peripheral Interface */
0, /* Serial Peripheral Interface */
0, /* Synchronous Serial Controller 0 */
0, /* Synchronous Serial Controller 1 */
0, /* Timer Counter 0,1,2,3,4,5 */
0, /* Pulse Width Modulation Controller */
2, /* Touch Screen ADC Controller */
3, /* DMA Controller */
0, /* USB Host High Speed */
5, /* LCD Controller */
5, /* AC97 Controller */
5, /* Ethernet MAC */
0, /* Image Sensor Interface */
0, /* USB Device High Speed */
0, /* N/A */
0, /* High Speed Multimedia Card Interface 1 */
0, /* Reserved */
0, /* Advanced Interrupt Controller - IRQ */
};
/**
* @addtogroup AT91SAM9G45
*/
/*@{*/
void rt_hw_interrupt_mask(int irq);
void rt_hw_interrupt_umask(int irq);
rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector, void *param)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
return RT_NULL;
}
rt_isr_handler_t at91_gpio_irq_handle(rt_uint32_t bank, void *param)
{
rt_uint32_t isr, irq_n;
AT91PS_PIO pio;
void *parameter;
switch (bank)
{
case 0: pio = AT91C_BASE_PIOA; break;
case 1: pio = AT91C_BASE_PIOB; break;
case 2: pio = AT91C_BASE_PIOC; break;
case 3: pio = AT91C_BASE_PIOD; break;
case 4: pio = AT91C_BASE_PIOE; break;
default: return RT_NULL;
}
irq_n = AIC_IRQS + 32*bank;
isr = readl(pio->PIO_ISR);
isr &= readl(pio->PIO_IMR);
while (isr)
{
if (isr & 1)
{
parameter = irq_desc[irq_n].param;
irq_desc[irq_n].handler(irq_n, parameter);
}
isr >>= 1;
irq_n++;
}
return RT_NULL;
}
unsigned int SpuriousCount = 0;
static void DefaultSpuriousHandler( void )
{
SpuriousCount++;
rt_kprintf("Spurious interrupt %d occured!!!\n", SpuriousCount);
return ;
}
static void DefaultFiqHandler(void)
{
rt_kprintf("Unhandled FIQ occured!!!\n");
while (1);
}
static void DefaultIrqHandler(void)
{
rt_kprintf("Unhandled IRQ %d occured!!!\n", AT91C_BASE_AIC->AIC_ISR);
while (1);
}
/*
* Initialize the AIC interrupt controller.
*/
void at91_aic_init(rt_uint32_t *priority)
{
rt_uint32_t i;
/*
* The IVR is used by macro get_irqnr_and_base to read and verify.
* The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
*/
AT91C_BASE_AIC->AIC_SVR[0] = (rt_uint32_t)DefaultFiqHandler;
for (i = 1; i < AIC_IRQS; i++) {
/* Put irq number in Source Vector Register: */
AT91C_BASE_AIC->AIC_SVR[i] = (rt_uint32_t)DefaultIrqHandler; // no-used
/* Active Low interrupt, with the specified priority */
AT91C_BASE_AIC->AIC_SMR[i] = AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE | priority[i];
//AT91C_AIC_SRCTYPE_FALLING
}
/*
* Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
* When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
*/
AT91C_BASE_AIC->AIC_SPU = (rt_uint32_t)DefaultSpuriousHandler;
/* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
for (i = 0; i < 8; i++)
AT91C_BASE_AIC->AIC_EOICR = 0;
/* No debugging in AIC: Debug (Protect) Control Register */
AT91C_BASE_AIC->AIC_DCR = 0;
/* Disable and clear all interrupts initially */
AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF;
AT91C_BASE_AIC->AIC_ICCR = 0xFFFFFFFF;
}
static void at91_gpio_irq_init()
{
int i, idx;
char *name[] = {"PIOA", "PIOB", "PIOC", "PIODE"};
rt_uint32_t aic_pids[] = { AT91C_ID_PIOA, AT91C_ID_PIOB, AT91C_ID_PIOC, AT91C_ID_PIOD_E };
AT91C_BASE_PIOA->PIO_IDR = 0xffffffff;
AT91C_BASE_PIOB->PIO_IDR = 0xffffffff;
AT91C_BASE_PIOC->PIO_IDR = 0xffffffff;
AT91C_BASE_PIOD->PIO_IDR = 0xffffffff;
AT91C_BASE_PIOE->PIO_IDR = 0xffffffff;
for (i = 0; i < 4; i++)
{
idx = aic_pids[i];
irq_desc[idx].handler = (rt_isr_handler_t)at91_gpio_irq_handle;
irq_desc[idx].param = RT_NULL;
#ifdef RT_USING_INTERRUPT_INFO
rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, name[i]);
irq_desc[idx].counter = 0;
#endif
rt_hw_interrupt_umask(idx);
}
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
register rt_uint32_t idx;
rt_uint32_t *priority = at91sam9g45_default_irq_priority;
at91_extern_irq = (1UL << AT91C_ID_IRQ0);
/* Initialize the AIC interrupt controller */
at91_aic_init(priority);
/* init exceptions table */
for(idx=0; idx < MAX_HANDLERS; idx++)
{
irq_desc[idx].handler = (rt_isr_handler_t)rt_hw_interrupt_handle;
irq_desc[idx].param = RT_NULL;
#ifdef RT_USING_INTERRUPT_INFO
rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, "default");
irq_desc[idx].counter = 0;
#endif
}
at91_gpio_irq_init();
/* init interrupt nest, and context in thread sp */
rt_interrupt_nest = 0;
rt_interrupt_from_thread = 0;
rt_interrupt_to_thread = 0;
rt_thread_switch_interrupt_flag = 0;
}
static void at91_gpio_irq_mask(int irq)
{
rt_uint32_t pin, bank;
AT91PS_PIO pio;
bank = (irq - AIC_IRQS)>>5;
switch (bank)
{
case 0: pio = AT91C_BASE_PIOA; break;
case 1: pio = AT91C_BASE_PIOB; break;
case 2: pio = AT91C_BASE_PIOC; break;
case 3: pio = AT91C_BASE_PIOD; break;
case 4: pio = AT91C_BASE_PIOE; break;
default: return;
}
pin = 1 << ((irq - AIC_IRQS) & 31);
pio->PIO_IDR = pin;
}
/**
* This function will mask a interrupt.
* @param irq the interrupt number
*/
void rt_hw_interrupt_mask(int irq)
{
if (irq >= AIC_IRQS)
{
at91_gpio_irq_mask(irq);
}
else
{
/* Disable interrupt on AIC */
AT91C_BASE_AIC->AIC_IDCR = 1 << irq;
}
}
static void at91_gpio_irq_umask(int irq)
{
rt_uint32_t pin, bank;
AT91PS_PIO pio;
bank = (irq - AIC_IRQS)>>5;
switch (bank)
{
case 0: pio = AT91C_BASE_PIOA; break;
case 1: pio = AT91C_BASE_PIOB; break;
case 2: pio = AT91C_BASE_PIOC; break;
case 3: pio = AT91C_BASE_PIOD; break;
case 4: pio = AT91C_BASE_PIOE; break;
default: return;
}
pin = 1 << ((irq - AIC_IRQS) & 31);
pio->PIO_IER = pin;
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int irq)
{
if (irq >= AIC_IRQS)
{
at91_gpio_irq_umask(irq);
}
else
{
/* Enable interrupt on AIC */
AT91C_BASE_AIC->AIC_IECR = 1 << irq;
}
}
/**
* This function will install a interrupt service routine to a interrupt.
* @param vector the interrupt number
* @param handler the interrupt service routine to be installed
* @param param the interrupt service function parameter
* @param name the interrupt name
* @return old handler
*/
rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
void *param, const char *name)
{
rt_isr_handler_t old_handler = RT_NULL;
if (vector < MAX_HANDLERS)
{
old_handler = irq_desc[vector].handler;
if (handler != RT_NULL)
{
irq_desc[vector].handler = (rt_isr_handler_t)handler;
irq_desc[vector].param = param;
#ifdef RT_USING_INTERRUPT_INFO
rt_snprintf(irq_desc[vector].name, RT_NAME_MAX - 1, "%s", name);
irq_desc[vector].counter = 0;
#endif
}
}
return old_handler;
}
/*@}*/
/*
static int at91_aic_set_type(unsigned irq, unsigned type)
{
unsigned int smr, srctype;
switch (type) {
case AT91C_AIC_SRCTYPE_EXT_HIGH_LEVEL:
srctype = AT91C_AIC_SRCTYPE_HIGH;
break;
case AT91C_AIC_SRCTYPE_EXT_POSITIVE_EDGE:
srctype = AT91C_AIC_SRCTYPE_RISING;
break;
case AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE:
// only supported on external interrupts
if ((irq == AT91C_ID_FIQ) || is_extern_irq(irq))
srctype = AT91C_AIC_SRCTYPE_LOW;
else
return -1;
break;
case AT91C_AIC_SRCTYPE_INT_EDGE_TRIGGERED:
// only supported on external interrupts
if ((irq == AT91C_ID_FIQ) || is_extern_irq(irq))
srctype = AT91C_AIC_SRCTYPE_FALLING;
else
return -1;
break;
default:
return -1;
}
smr = readl(AT91C_AIC_SMR(irq)) & ~AT91C_AIC_SRCTYPE;
AT91C_BASE_AIC->AIC_SMR[irq] = smr | srctype;
return 0;
}
*/
rt_uint32_t rt_hw_interrupt_get_active(rt_uint32_t fiq_irq)
{
//volatile rt_uint32_t irqstat;
rt_uint32_t id;
if (fiq_irq == INT_FIQ)
return 0;
//IRQ
/* AIC need this dummy read */
readl(AT91C_AIC_IVR);
/* clear pending register */
id = readl(AT91C_AIC_ISR);
return id;
}
void rt_hw_interrupt_ack(rt_uint32_t fiq_irq, rt_uint32_t id)
{
/* new FIQ generation */
if (fiq_irq == INT_FIQ)
return;
/* new IRQ generation */
// EIOCR must be write any value after interrupt,
// or else can't response next interrupt
AT91C_BASE_AIC->AIC_EOICR = 0x0;
}
void rt_interrupt_dispatch(rt_uint32_t fiq_irq)
{
rt_isr_handler_t isr_func;
rt_uint32_t irq;
void *param;
/* get irq number */
irq = rt_hw_interrupt_get_active(fiq_irq);
/* get interrupt service routine */
isr_func = irq_desc[irq].handler;
param = irq_desc[irq].param;
/* turn to interrupt service routine */
isr_func(irq, param);
rt_hw_interrupt_ack(fiq_irq, irq);
#ifdef RT_USING_INTERRUPT_INFO
irq_desc[irq].counter ++;
#endif
}
#ifdef RT_USING_FINSH
#ifdef RT_USING_INTERRUPT_INFO
void list_irq(void)
{
int irq;
rt_kprintf("number\tcount\tname\n");
for (irq = 0; irq < MAX_HANDLERS; irq++)
{
if (rt_strncmp(irq_desc[irq].name, "default", sizeof("default")))
{
rt_kprintf("%02ld: %10ld %s\n", irq, irq_desc[irq].counter, irq_desc[irq].name);
}
}
}
#include <finsh.h>
FINSH_FUNCTION_EXPORT(list_irq, list system irq);
#ifdef FINSH_USING_MSH
int cmd_list_irq(int argc, char** argv)
{
list_irq();
return 0;
}
FINSH_FUNCTION_EXPORT_ALIAS(cmd_list_irq, __cmd_list_irq, list system irq.);
#endif
#endif
#endif
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