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rt-thread-official/bsp/at91sam9260/platform/interrupt.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2011-01-13 weety first version
*/
#include <rthw.h>
#include "at91sam926x.h"
#include "interrupt.h"
#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 at91sam9260_default_irq_priority[MAX_HANDLERS] = {
7, /* Advanced Interrupt Controller */
7, /* System Peripherals */
1, /* Parallel IO Controller A */
1, /* Parallel IO Controller B */
1, /* Parallel IO Controller C */
0, /* Analog-to-Digital Converter */
5, /* USART 0 */
5, /* USART 1 */
5, /* USART 2 */
0, /* Multimedia Card Interface */
2, /* USB Device Port */
6, /* Two-Wire Interface */
5, /* Serial Peripheral Interface 0 */
5, /* Serial Peripheral Interface 1 */
5, /* Serial Synchronous Controller */
0,
0,
0, /* Timer Counter 0 */
0, /* Timer Counter 1 */
0, /* Timer Counter 2 */
2, /* USB Host port */
3, /* Ethernet */
0, /* Image Sensor Interface */
5, /* USART 3 */
5, /* USART 4 */
5, /* USART 5 */
0, /* Timer Counter 3 */
0, /* Timer Counter 4 */
0, /* Timer Counter 5 */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
0, /* Advanced Interrupt Controller */
};
/**
* @addtogroup AT91SAM926X
*/
/*@{*/
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 vector, void *param)
{
rt_uint32_t isr, pio, irq_n;
void *parameter;
if (vector == AT91SAM9260_ID_PIOA)
{
pio = AT91_PIOA;
irq_n = AIC_IRQS;
}
else if (vector == AT91SAM9260_ID_PIOB)
{
pio = AT91_PIOB;
irq_n = AIC_IRQS + 32;
}
else if (vector == AT91SAM9260_ID_PIOC)
{
pio = AT91_PIOC;
irq_n = AIC_IRQS + 32*2;
}
else
return RT_NULL;
isr = at91_sys_read(pio+PIO_ISR) & at91_sys_read(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;
}
/*
* 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.
*/
for (i = 0; i < AIC_IRQS; i++) {
/* Put irq number in Source Vector Register: */
at91_sys_write(AT91_AIC_SVR(i), i); // no-used
/* Active Low interrupt, with the specified priority */
at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
//AT91_AIC_SRCTYPE_FALLING
/* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
if (i < 8)
at91_sys_write(AT91_AIC_EOICR, 0);
}
/*
* 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
*/
at91_sys_write(AT91_AIC_SPU, AIC_IRQS);
/* No debugging in AIC: Debug (Protect) Control Register */
at91_sys_write(AT91_AIC_DCR, 0);
/* Disable and clear all interrupts initially */
at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF);
at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF);
}
static void at91_gpio_irq_init()
{
int i, idx;
char *name[] = {"PIOA", "PIOB", "PIOC"};
at91_sys_write(AT91_PIOA+PIO_IDR, 0xffffffff);
at91_sys_write(AT91_PIOB+PIO_IDR, 0xffffffff);
at91_sys_write(AT91_PIOC+PIO_IDR, 0xffffffff);
idx = AT91SAM9260_ID_PIOA;
for (i = 0; i < 3; 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
idx++;
}
rt_hw_interrupt_umask(AT91SAM9260_ID_PIOA);
rt_hw_interrupt_umask(AT91SAM9260_ID_PIOB);
rt_hw_interrupt_umask(AT91SAM9260_ID_PIOC);
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
register rt_uint32_t idx;
rt_uint32_t *priority = at91sam9260_default_irq_priority;
at91_extern_irq = (1UL << AT91SAM9260_ID_IRQ0) | (1UL << AT91SAM9260_ID_IRQ1)
| (1UL << AT91SAM9260_ID_IRQ2);
/* 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, pio, bank;
bank = (irq - AIC_IRQS)>>5;
if (bank == 0)
{
pio = AT91_PIOA;
}
else if (bank == 1)
{
pio = AT91_PIOB;
}
else if (bank == 2)
{
pio = AT91_PIOC;
}
else
return;
pin = 1 << ((irq - AIC_IRQS) & 31);
at91_sys_write(pio+PIO_IDR, pin);
}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(int irq)
{
if (irq >= AIC_IRQS)
{
at91_gpio_irq_mask(irq);
}
else
{
/* Disable interrupt on AIC */
at91_sys_write(AT91_AIC_IDCR, 1 << irq);
}
}
static void at91_gpio_irq_umask(int irq)
{
rt_uint32_t pin, pio, bank;
bank = (irq - AIC_IRQS)>>5;
if (bank == 0)
{
pio = AT91_PIOA;
}
else if (bank == 1)
{
pio = AT91_PIOB;
}
else if (bank == 2)
{
pio = AT91_PIOC;
}
else
return;
pin = 1 << ((irq - AIC_IRQS) & 31);
at91_sys_write(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 */
at91_sys_write(AT91_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 IRQ_TYPE_LEVEL_HIGH:
srctype = AT91_AIC_SRCTYPE_HIGH;
break;
case IRQ_TYPE_EDGE_RISING:
srctype = AT91_AIC_SRCTYPE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
// only supported on external interrupts
if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))
srctype = AT91_AIC_SRCTYPE_LOW;
else
return -1;
break;
case IRQ_TYPE_EDGE_FALLING:
// only supported on external interrupts
if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))
srctype = AT91_AIC_SRCTYPE_FALLING;
else
return -1;
break;
default:
return -1;
}
smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE;
at91_sys_write(AT91_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 */
at91_sys_read(AT91_AIC_IVR);
/* clear pending register */
id = at91_sys_read(AT91_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
at91_sys_write(AT91_AIC_EOICR, 0x0);
}
#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>
#ifdef FINSH_USING_MSH
int cmd_list_irq(int argc, char** argv)
{
list_irq();
return 0;
}
MSH_CMD_EXPORT_ALIAS(cmd_list_irq, list_irq, list system irq);
#endif
#endif
#endif
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