rt-thread/libcpu/mips/loongson_1b/interrupt.c

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/*
* File : interrupt.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2011, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2010-10-15 Bernard first version
* 2010-10-15 lgnq modified for LS1B
*/
#include <rtthread.h>
#include "ls1b.h"
#define MAX_INTR 32
extern rt_uint32_t rt_interrupt_nest;
rt_uint32_t rt_interrupt_from_thread;
rt_uint32_t rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
static rt_isr_handler_t irq_handle_table[MAX_INTR];
void rt_interrupt_dispatch(void *ptreg);
void rt_hw_timer_handler();
static struct ls1b_intc_regs volatile *ls1b_hw0_icregs
= (struct ls1b_intc_regs volatile *)(LS1B_INTREG_BASE);
/**
* @addtogroup Loongson LS1B
*/
/*@{*/
void rt_hw_interrupt_handler(int vector)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
rt_int32_t index;
/* pci active low */
ls1b_hw0_icregs->int_pol = -1; //must be done here 20110802 lgnq
/* make all interrupts level triggered */
(ls1b_hw0_icregs+0)->int_edge = 0x0000e000;
/* mask all interrupts */
(ls1b_hw0_icregs+0)->int_clr = 0xffffffff;
for (index = 0; index < MAX_INTR; index ++)
{
irq_handle_table[index] = (rt_isr_handler_t)rt_hw_interrupt_handler;
}
/* 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;
}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(int vector)
{
/* mask interrupt */
(ls1b_hw0_icregs+(vector>>5))->int_en &= ~(1 << (vector&0x1f));
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
{
(ls1b_hw0_icregs+(vector>>5))->int_en |= (1 << (vector&0x1f));
}
/**
* This function will install a interrupt service routine to a interrupt.
* @param vector the interrupt number
* @param new_handler the interrupt service routine to be installed
* @param old_handler the old interrupt service routine
*/
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
if (vector >= 0 && vector < MAX_INTR)
{
if (old_handler != RT_NULL)
*old_handler = irq_handle_table[vector];
if (new_handler != RT_NULL)
irq_handle_table[vector] = (rt_isr_handler_t)new_handler;
}
}
void rt_interrupt_dispatch(void *ptreg)
{
int i;
rt_isr_handler_t irq_func;
static rt_uint32_t status = 0;
rt_uint32_t c0_status;
rt_uint32_t c0_cause;
volatile rt_uint32_t cause_im;
volatile rt_uint32_t status_im;
rt_uint32_t pending_im;
/* check os timer */
c0_status = read_c0_status();
c0_cause = read_c0_cause();
cause_im = c0_cause & ST0_IM;
status_im = c0_status & ST0_IM;
pending_im = cause_im & status_im;
if (pending_im & CAUSEF_IP7)
{
rt_hw_timer_handler();
}
if (pending_im & CAUSEF_IP2)
{
/* the hardware interrupt */
status = ls1b_hw0_icregs->int_isr;
if (!status)
return;
for (i = MAX_INTR; i > 0; --i)
{
if ((status & (1<<i)))
{
status &= ~(1<<i);
irq_func = irq_handle_table[i];
/* do interrupt */
(*irq_func)(i);
/* ack interrupt */
ls1b_hw0_icregs->int_clr |= (1 << i);
}
}
}
else if (pending_im & CAUSEF_IP3)
{
rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
}
else if (pending_im & CAUSEF_IP4)
{
rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
}
else if (pending_im & CAUSEF_IP5)
{
rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
}
else if (pending_im & CAUSEF_IP6)
{
rt_kprintf("%s %d\r\n", __FUNCTION__, __LINE__);
}
}
/*@}*/