445 lines
11 KiB
C
445 lines
11 KiB
C
/*
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* File : interrupt.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2011-01-13 weety first version
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*/
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#include <rthw.h>
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#include "at91sam926x.h"
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#include "interrupt.h"
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#define MAX_HANDLERS (AIC_IRQS + PIN_IRQS)
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extern rt_uint32_t rt_interrupt_nest;
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/* exception and interrupt handler table */
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struct rt_irq_desc irq_desc[MAX_HANDLERS];
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rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
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rt_uint32_t rt_thread_switch_interrupt_flag;
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/* --------------------------------------------------------------------
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* Interrupt initialization
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* -------------------------------------------------------------------- */
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rt_uint32_t at91_extern_irq;
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#define is_extern_irq(irq) ((1 << (irq)) & at91_extern_irq)
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/*
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* The default interrupt priority levels (0 = lowest, 7 = highest).
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*/
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static rt_uint32_t at91sam9260_default_irq_priority[MAX_HANDLERS] = {
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7, /* Advanced Interrupt Controller */
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7, /* System Peripherals */
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1, /* Parallel IO Controller A */
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1, /* Parallel IO Controller B */
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1, /* Parallel IO Controller C */
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0, /* Analog-to-Digital Converter */
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5, /* USART 0 */
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5, /* USART 1 */
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5, /* USART 2 */
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0, /* Multimedia Card Interface */
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2, /* USB Device Port */
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6, /* Two-Wire Interface */
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5, /* Serial Peripheral Interface 0 */
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5, /* Serial Peripheral Interface 1 */
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5, /* Serial Synchronous Controller */
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0,
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0,
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0, /* Timer Counter 0 */
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0, /* Timer Counter 1 */
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0, /* Timer Counter 2 */
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2, /* USB Host port */
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3, /* Ethernet */
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0, /* Image Sensor Interface */
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5, /* USART 3 */
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5, /* USART 4 */
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5, /* USART 5 */
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0, /* Timer Counter 3 */
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0, /* Timer Counter 4 */
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0, /* Timer Counter 5 */
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0, /* Advanced Interrupt Controller */
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0, /* Advanced Interrupt Controller */
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0, /* Advanced Interrupt Controller */
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};
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/**
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* @addtogroup AT91SAM926X
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*/
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/*@{*/
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void rt_hw_interrupt_mask(int irq);
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void rt_hw_interrupt_umask(int irq);
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rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector, void *param)
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{
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rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
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return RT_NULL;
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}
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rt_isr_handler_t at91_gpio_irq_handle(rt_uint32_t vector, void *param)
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{
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rt_uint32_t isr, pio, irq_n;
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void *parameter;
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if (vector == AT91SAM9260_ID_PIOA)
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{
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pio = AT91_PIOA;
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irq_n = AIC_IRQS;
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}
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else if (vector == AT91SAM9260_ID_PIOB)
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{
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pio = AT91_PIOB;
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irq_n = AIC_IRQS + 32;
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}
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else if (vector == AT91SAM9260_ID_PIOC)
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{
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pio = AT91_PIOC;
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irq_n = AIC_IRQS + 32*2;
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}
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else
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return RT_NULL;
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isr = at91_sys_read(pio+PIO_ISR) & at91_sys_read(pio+PIO_IMR);
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while (isr)
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{
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if (isr & 1)
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{
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parameter = irq_desc[irq_n].param;
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irq_desc[irq_n].handler(irq_n, parameter);
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}
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isr >>= 1;
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irq_n++;
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}
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return RT_NULL;
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}
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/*
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* Initialize the AIC interrupt controller.
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*/
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void at91_aic_init(rt_uint32_t *priority)
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{
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rt_uint32_t i;
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/*
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* The IVR is used by macro get_irqnr_and_base to read and verify.
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* The irq number is NR_AIC_IRQS when a spurious interrupt has occurred.
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*/
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for (i = 0; i < AIC_IRQS; i++) {
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/* Put irq number in Source Vector Register: */
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at91_sys_write(AT91_AIC_SVR(i), i); // no-used
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/* Active Low interrupt, with the specified priority */
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at91_sys_write(AT91_AIC_SMR(i), AT91_AIC_SRCTYPE_LOW | priority[i]);
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//AT91_AIC_SRCTYPE_FALLING
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/* Perform 8 End Of Interrupt Command to make sure AIC will not Lock out nIRQ */
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if (i < 8)
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at91_sys_write(AT91_AIC_EOICR, 0);
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}
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/*
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* Spurious Interrupt ID in Spurious Vector Register is NR_AIC_IRQS
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* When there is no current interrupt, the IRQ Vector Register reads the value stored in AIC_SPU
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*/
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at91_sys_write(AT91_AIC_SPU, AIC_IRQS);
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/* No debugging in AIC: Debug (Protect) Control Register */
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at91_sys_write(AT91_AIC_DCR, 0);
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/* Disable and clear all interrupts initially */
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at91_sys_write(AT91_AIC_IDCR, 0xFFFFFFFF);
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at91_sys_write(AT91_AIC_ICCR, 0xFFFFFFFF);
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}
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static void at91_gpio_irq_init()
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{
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int i, idx;
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char *name[] = {"PIOA", "PIOB", "PIOC"};
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at91_sys_write(AT91_PIOA+PIO_IDR, 0xffffffff);
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at91_sys_write(AT91_PIOB+PIO_IDR, 0xffffffff);
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at91_sys_write(AT91_PIOC+PIO_IDR, 0xffffffff);
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idx = AT91SAM9260_ID_PIOA;
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for (i = 0; i < 3; i++)
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{
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irq_desc[idx].handler = (rt_isr_handler_t)at91_gpio_irq_handle;
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irq_desc[idx].param = RT_NULL;
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#ifdef RT_USING_INTERRUPT_INFO
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rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, name[i]);
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irq_desc[idx].counter = 0;
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#endif
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idx++;
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}
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rt_hw_interrupt_umask(AT91SAM9260_ID_PIOA);
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rt_hw_interrupt_umask(AT91SAM9260_ID_PIOB);
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rt_hw_interrupt_umask(AT91SAM9260_ID_PIOC);
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}
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/**
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* This function will initialize hardware interrupt
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*/
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void rt_hw_interrupt_init(void)
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{
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register rt_uint32_t idx;
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rt_uint32_t *priority = at91sam9260_default_irq_priority;
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at91_extern_irq = (1UL << AT91SAM9260_ID_IRQ0) | (1UL << AT91SAM9260_ID_IRQ1)
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| (1UL << AT91SAM9260_ID_IRQ2);
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/* Initialize the AIC interrupt controller */
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at91_aic_init(priority);
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/* init exceptions table */
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for(idx=0; idx < MAX_HANDLERS; idx++)
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{
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irq_desc[idx].handler = (rt_isr_handler_t)rt_hw_interrupt_handle;
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irq_desc[idx].param = RT_NULL;
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#ifdef RT_USING_INTERRUPT_INFO
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rt_snprintf(irq_desc[idx].name, RT_NAME_MAX - 1, "default");
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irq_desc[idx].counter = 0;
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#endif
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}
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at91_gpio_irq_init();
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/* init interrupt nest, and context in thread sp */
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rt_interrupt_nest = 0;
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rt_interrupt_from_thread = 0;
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rt_interrupt_to_thread = 0;
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rt_thread_switch_interrupt_flag = 0;
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}
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static void at91_gpio_irq_mask(int irq)
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{
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rt_uint32_t pin, pio, bank;
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bank = (irq - AIC_IRQS)>>5;
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if (bank == 0)
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{
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pio = AT91_PIOA;
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}
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else if (bank == 1)
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{
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pio = AT91_PIOB;
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}
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else if (bank == 2)
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{
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pio = AT91_PIOC;
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}
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else
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return;
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pin = 1 << ((irq - AIC_IRQS) & 31);
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at91_sys_write(pio+PIO_IDR, pin);
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}
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/**
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* This function will mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_mask(int irq)
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{
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if (irq >= AIC_IRQS)
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{
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at91_gpio_irq_mask(irq);
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}
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else
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{
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/* Disable interrupt on AIC */
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at91_sys_write(AT91_AIC_IDCR, 1 << irq);
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}
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}
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static void at91_gpio_irq_umask(int irq)
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{
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rt_uint32_t pin, pio, bank;
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bank = (irq - AIC_IRQS)>>5;
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if (bank == 0)
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{
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pio = AT91_PIOA;
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}
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else if (bank == 1)
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{
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pio = AT91_PIOB;
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}
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else if (bank == 2)
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{
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pio = AT91_PIOC;
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}
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else
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return;
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pin = 1 << ((irq - AIC_IRQS) & 31);
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at91_sys_write(pio+PIO_IER, pin);
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}
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/**
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* This function will un-mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_umask(int irq)
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{
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if (irq >= AIC_IRQS)
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{
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at91_gpio_irq_umask(irq);
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}
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else
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{
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/* Enable interrupt on AIC */
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at91_sys_write(AT91_AIC_IECR, 1 << irq);
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}
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}
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/**
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* This function will install a interrupt service routine to a interrupt.
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* @param vector the interrupt number
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* @param handler the interrupt service routine to be installed
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* @param param the interrupt service function parameter
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* @param name the interrupt name
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* @return old handler
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*/
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rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
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void *param, const char *name)
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{
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rt_isr_handler_t old_handler = RT_NULL;
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if(vector < MAX_HANDLERS)
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{
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old_handler = irq_desc[vector].handler;
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if (handler != RT_NULL)
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{
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irq_desc[vector].handler = (rt_isr_handler_t)handler;
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irq_desc[vector].param = param;
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#ifdef RT_USING_INTERRUPT_INFO
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rt_snprintf(irq_desc[vector].name, RT_NAME_MAX - 1, "%s", name);
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irq_desc[vector].counter = 0;
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#endif
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}
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}
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return old_handler;
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}
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/*@}*/
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/*
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static int at91_aic_set_type(unsigned irq, unsigned type)
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{
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unsigned int smr, srctype;
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switch (type) {
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case IRQ_TYPE_LEVEL_HIGH:
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srctype = AT91_AIC_SRCTYPE_HIGH;
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break;
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case IRQ_TYPE_EDGE_RISING:
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srctype = AT91_AIC_SRCTYPE_RISING;
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break;
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case IRQ_TYPE_LEVEL_LOW:
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// only supported on external interrupts
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if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))
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srctype = AT91_AIC_SRCTYPE_LOW;
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else
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return -1;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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// only supported on external interrupts
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if ((irq == AT91_ID_FIQ) || is_extern_irq(irq))
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srctype = AT91_AIC_SRCTYPE_FALLING;
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else
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return -1;
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break;
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default:
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return -1;
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}
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smr = at91_sys_read(AT91_AIC_SMR(irq)) & ~AT91_AIC_SRCTYPE;
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at91_sys_write(AT91_AIC_SMR(irq), smr | srctype);
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return 0;
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}
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*/
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rt_uint32_t rt_hw_interrupt_get_active(rt_uint32_t fiq_irq)
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{
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//volatile rt_uint32_t irqstat;
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rt_uint32_t id;
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if (fiq_irq == INT_FIQ)
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return 0;
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//IRQ
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/* AIC need this dummy read */
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at91_sys_read(AT91_AIC_IVR);
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/* clear pending register */
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id = at91_sys_read(AT91_AIC_ISR);
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return id;
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}
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void rt_hw_interrupt_ack(rt_uint32_t fiq_irq, rt_uint32_t id)
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{
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/* new FIQ generation */
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if (fiq_irq == INT_FIQ)
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return;
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/* new IRQ generation */
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// EIOCR must be write any value after interrupt,
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// or else can't response next interrupt
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at91_sys_write(AT91_AIC_EOICR, 0x0);
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}
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#ifdef RT_USING_FINSH
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#ifdef RT_USING_INTERRUPT_INFO
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void list_irq(void)
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{
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int irq;
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rt_kprintf("number\tcount\tname\n");
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for (irq = 0; irq < MAX_HANDLERS; irq++)
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{
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if (rt_strncmp(irq_desc[irq].name, "default", sizeof("default")))
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{
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rt_kprintf("%02ld: %10ld %s\n", irq, irq_desc[irq].counter, irq_desc[irq].name);
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}
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}
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}
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#include <finsh.h>
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FINSH_FUNCTION_EXPORT(list_irq, list system irq);
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#ifdef FINSH_USING_MSH
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int cmd_list_irq(int argc, char** argv)
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{
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list_irq();
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return 0;
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}
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FINSH_FUNCTION_EXPORT_ALIAS(cmd_list_irq, __cmd_list_irq, list system irq.);
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#endif
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#endif
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#endif
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