159 lines
4.1 KiB
C
159 lines
4.1 KiB
C
/*
|
|
* File : interrupt.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2018, 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
|
|
*/
|
|
|
|
#include <rthw.h>
|
|
#include <plic_driver.h>
|
|
#include <platform.h>
|
|
#include <encoding.h>
|
|
#include <interrupt.h>
|
|
|
|
#define MAX_HANDLERS PLIC_NUM_INTERRUPTS
|
|
|
|
/* exception and interrupt handler table */
|
|
static struct rt_irq_desc irq_desc[MAX_HANDLERS];
|
|
|
|
static plic_instance_t g_plic;
|
|
|
|
/**
|
|
* This function will mask a interrupt.
|
|
* @param vector the interrupt number
|
|
*/
|
|
void rt_hw_interrupt_mask(int irq)
|
|
{
|
|
PLIC_disable_interrupt(&g_plic, irq);
|
|
}
|
|
|
|
/**
|
|
* This function will un-mask a interrupt.
|
|
* @param vector the interrupt number
|
|
*/
|
|
void rt_hw_interrupt_unmask(int irq)
|
|
{
|
|
PLIC_enable_interrupt(&g_plic, irq);
|
|
PLIC_set_priority(&g_plic, irq, 1);
|
|
}
|
|
|
|
rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector, void *param)
|
|
{
|
|
rt_kprintf("UN-handled interrupt %d occurred!!!\n", vector);
|
|
return RT_NULL;
|
|
}
|
|
|
|
void rt_hw_interrupt_init(void)
|
|
{
|
|
int idx;
|
|
|
|
/* config interrupt vector*/
|
|
asm volatile(
|
|
"la t0, trap_entry\n"
|
|
"csrw mtvec, t0"
|
|
);
|
|
|
|
/* enable global interrupt*/
|
|
PLIC_init(&g_plic,
|
|
PLIC_CTRL_ADDR,
|
|
PLIC_NUM_INTERRUPTS,
|
|
PLIC_NUM_PRIORITIES);
|
|
|
|
/* init exceptions table */
|
|
for (idx = 0; idx < MAX_HANDLERS; idx++)
|
|
{
|
|
rt_hw_interrupt_mask(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
|
|
}
|
|
|
|
// enable machine external interrupt
|
|
set_csr(mie, MIP_MEIP);
|
|
}
|
|
|
|
rt_uint32_t rt_hw_interrupt_get_active(rt_uint32_t fiq_irq)
|
|
{
|
|
return (rt_uint32_t)PLIC_claim_interrupt(&g_plic);;
|
|
}
|
|
|
|
void rt_hw_interrupt_ack(rt_uint32_t fiq_irq, rt_uint32_t id)
|
|
{
|
|
PLIC_complete_interrupt(&g_plic, id);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* This function will be call when external machine-level
|
|
* interrupt from PLIC occurred.
|
|
*/
|
|
void handle_m_ext_interrupt(void)
|
|
{
|
|
rt_isr_handler_t isr_func;
|
|
rt_uint32_t irq;
|
|
void *param;
|
|
|
|
/* get irq number */
|
|
irq = rt_hw_interrupt_get_active(0);
|
|
|
|
/* 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(0, irq);
|
|
|
|
#ifdef RT_USING_INTERRUPT_INFO
|
|
irq_desc[irq].counter ++;
|
|
#endif
|
|
}
|