rt-thread-official/bsp/hifive1/drivers/interrupt.c

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2018-05-30 22:17:25 +08:00
/*
* 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)
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{
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
}