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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
* 2013-03-29 aozima Modify the interrupt interface implementations.
* 2015-07-06 chinesebear modified for loongson 1c
*/
#include <rtthread.h>
#include <rthw.h>
#include "ls1c.h"
#include "ls1c_public.h"
#define MAX_INTR (LS1C_NR_IRQS)
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 struct rt_irq_desc irq_handle_table[MAX_INTR];
void rt_interrupt_dispatch(void *ptreg);
void rt_hw_timer_handler();
static struct ls1c_intc_regs volatile *ls1c_hw0_icregs
= (struct ls1c_intc_regs volatile *)(LS1C_INTREG_BASE);
/**
* @addtogroup Loongson LS1B
*/
/*@{*/
static void rt_hw_interrupt_handler(int vector, void *param)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
rt_int32_t idx;
rt_int32_t i;
rt_uint32_t c0_status = 0;
// ����Э������0��״̬�Ĵ���SR��IM7-2�������ж�
c0_status = read_c0_status();
c0_status |= 0xFC00;
write_c0_status(c0_status);
// ��о1c���жϷ�Ϊ����
for (i=0; i<5; i++)
{
/* disable */
(ls1c_hw0_icregs+i)->int_en = 0x0;
/* pci active low */
(ls1c_hw0_icregs+i)->int_pol = -1; //must be done here 20110802 lgnq
/* make all interrupts level triggered */
(ls1c_hw0_icregs+i)->int_edge = 0x00000000;
/* mask all interrupts */
(ls1c_hw0_icregs+i)->int_clr = 0xffffffff;
}
rt_memset(irq_handle_table, 0x00, sizeof(irq_handle_table));
for (idx = 0; idx < MAX_INTR; idx ++)
{
irq_handle_table[idx].handler = 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 */
(ls1c_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)
{
(ls1c_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
*/
rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
void *param, char *name)
{
rt_isr_handler_t old_handler = RT_NULL;
if (vector >= 0 && vector < MAX_INTR)
{
old_handler = irq_handle_table[vector].handler;
#ifdef RT_USING_INTERRUPT_INFO
rt_strncpy(irq_handle_table[vector].name, name, RT_NAME_MAX);
#endif /* RT_USING_INTERRUPT_INFO */
irq_handle_table[vector].handler = handler;
irq_handle_table[vector].param = param;
}
return old_handler;
}
/**
* ִ���жϴ�������
* @IRQn �жϺ�
*/
void ls1c_do_IRQ(int IRQn)
{
rt_isr_handler_t irq_func;
void *param;
// �ҵ��жϴ�������
irq_func = irq_handle_table[IRQn].handler;
param = irq_handle_table[IRQn].param;
// ִ���жϴ�������
irq_func(IRQn, param);
#ifdef RT_USING_INTERRUPT_INFO
irq_handle_table[IRQn].counter++;
#endif
return ;
}
void ls1c_irq_dispatch(int n)
{
rt_uint32_t intstatus, irq;
/* Receive interrupt signal, compute the irq */
intstatus = (ls1c_hw0_icregs+n)->int_isr & (ls1c_hw0_icregs+n)->int_en;
if (0 == intstatus)
return ;
// ִ���жϴ�������
irq = ls1c_ffs(intstatus) - 1;
ls1c_do_IRQ((n<<5) + irq);
/* ack interrupt */
(ls1c_hw0_icregs+n)->int_clr |= (1 << irq);
return ;
}
void rt_interrupt_dispatch(void *ptreg)
{
int irq;
void *param;
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();
}
else if (pending_im & CAUSEF_IP2)
{
ls1c_irq_dispatch(0);
}
else if (pending_im & CAUSEF_IP3)
{
ls1c_irq_dispatch(1);
}
else if (pending_im & CAUSEF_IP4)
{
ls1c_irq_dispatch(2);
}
else if (pending_im & CAUSEF_IP5)
{
ls1c_irq_dispatch(3);
}
else if (pending_im & CAUSEF_IP6)
{
ls1c_irq_dispatch(4);
}
}
/*@}*/
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