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/*
* File : interrupt.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2017, 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
* 2018-02-08 RT-Thread the first version
*/
#include <rthw.h>
#include <rtthread.h>
#include "interrupt.h"
extern rt_uint32_t rt_interrupt_nest;
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
static struct rt_irq_desc isr_table[INTERRUPTS_MAX];
static void rt_hw_interrupt_handler(int vector, void *param)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
#define readl(addr) (*(volatile unsigned int *)(addr))
#define writel(value,addr) (*(volatile unsigned int *)(addr) = (value))
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
rt_int32_t idx;
rt_memset(isr_table, 0x00, sizeof(isr_table));
for (idx = 0; idx < INTERRUPTS_MAX; idx ++)
{
isr_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;
/* set base_addr reg */
INTC->base_addr_reg = 0x00000000;
/* clear enable */
INTC->en_reg0 = 0x00000000;
INTC->en_reg1 = 0x00000000;
/* mask interrupt */
INTC->mask_reg0 = 0xFFFFFFFF;
INTC->mask_reg1 = 0xFFFFFFFF;
/* clear pending */
INTC->pend_reg0 = 0x00000000;
INTC->pend_reg1 = 0x00000000;
/* set priority */
INTC->resp_reg0 = 0x00000000;
INTC->resp_reg1 = 0x00000000;
/* close fiq interrupt */
INTC->ff_reg0 = 0x00000000;
INTC->ff_reg1 = 0x00000000;
}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(int vector)
{
rt_uint32_t mask_addr, data;
if ((vector < 0) || (vector > INTERRUPTS_MAX))
{
return;
}
mask_addr = (rt_uint32_t)(&INTC->mask_reg0);
mask_addr += vector & 0xE0 ? sizeof(rt_uint32_t *) : 0;
vector &= 0x1F;
data = readl(mask_addr);
data |= 0x1 << vector;
writel(data, mask_addr);
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
{
rt_uint32_t mask_addr, data;
if ((vector < 0) || (vector > INTERRUPTS_MAX))
{
return;
}
mask_addr = (rt_uint32_t)(&INTC->mask_reg0);
mask_addr += vector & 0xE0 ? sizeof(rt_uint32_t *) : 0;
vector &= 0x1F;
data = readl(mask_addr);
data &= ~(0x1 << vector);
writel(data, mask_addr);
}
/**
* 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, char *name)
{
rt_isr_handler_t old_handler = RT_NULL;
rt_uint32_t pend_addr, en_addr, data;
if ((vector < 0) || (vector > INTERRUPTS_MAX))
{
return old_handler;
}
old_handler = isr_table[vector].handler;
#ifdef RT_USING_INTERRUPT_INFO
rt_strncpy(isr_table[vector].name, name, RT_NAME_MAX);
#endif /* RT_USING_INTERRUPT_INFO */
isr_table[vector].handler = handler;
isr_table[vector].param = param;
pend_addr = (rt_uint32_t)(&INTC->pend_reg0);
en_addr = (rt_uint32_t)(&INTC->en_reg0);
pend_addr += vector & 0xE0 ? sizeof(rt_uint32_t *) : 0;
en_addr += vector & 0xE0 ? sizeof(rt_uint32_t *) : 0;
vector &= 0x1F;
data = readl(pend_addr);
data &= ~(0x1 << vector);
writel(data, pend_addr);
data = readl(en_addr);
data |= 0x1 << vector;
writel(data, en_addr);
return old_handler;
}
void rt_interrupt_dispatch(void)
{
void *param;
int vector;
rt_isr_handler_t isr_func;
rt_uint32_t pend_addr, data;
vector = INTC->vector_reg - INTC->base_addr_reg;
vector = vector >> 2;
isr_func = isr_table[vector].handler;
param = isr_table[vector].param;
/* jump to fun */
isr_func(vector, param);
/* clear pend bit */
pend_addr = (rt_uint32_t)(&INTC->pend_reg0);
pend_addr += vector & 0xE0 ? sizeof(rt_uint32_t *) : 0;
vector &= 0x1F;
data = readl(pend_addr);
data &= ~(0x1 << vector);
writel(data, pend_addr);
#ifdef RT_USING_INTERRUPT_INFO
isr_table[vector].counter ++;
#endif
}
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