162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
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* Interrupt handle for GS232
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*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2010-10-15 Bernard first version
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* 2010-10-15 lgnq modified for LS1B
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* 2013-03-29 aozima Modify the interrupt interface implementations.
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* 2015-07-06 chinesebear modified for loongson 1c
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* 2019-12-04 Jiaxun Yang Generialize
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*/
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#include <rtthread.h>
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#include <rthw.h>
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#include "gs232.h"
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#define MAX_INTR (GS232_NR_IRQS)
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static struct rt_irq_desc irq_handle_table[MAX_INTR];
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void rt_hw_timer_handler();
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static struct gs232_intc_regs volatile *gs232_hw0_icregs
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= (struct gs232_intc_regs volatile *)(INTC_BASE);
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/**
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* @addtogroup Loongson GS232
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*/
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/*@{*/
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static void rt_hw_interrupt_handler(int vector, void *param)
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{
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rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
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}
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/**
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* This function will initialize hardware interrupt
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*/
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void rt_hw_interrupt_init(void)
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{
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rt_int32_t idx;
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rt_int32_t i;
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rt_uint32_t c0_status = 0;
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for (i=0; i < GS232_INTC_CELLS; i++)
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{
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/* Disable */
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(gs232_hw0_icregs+i)->int_en = 0x0;
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/* Trigger active low */
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(gs232_hw0_icregs+i)->int_pol = -1; /* Must be done here */
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/* Make all interrupts level triggered */
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(gs232_hw0_icregs+i)->int_edge = 0x00000000;
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/* Mask all interrupts */
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(gs232_hw0_icregs+i)->int_clr = 0xffffffff;
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mips_unmask_cpu_irq(i + 2);
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}
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rt_memset(irq_handle_table, 0x00, sizeof(irq_handle_table));
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for (idx = 0; idx < MAX_INTR; idx ++)
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{
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irq_handle_table[idx].handler = rt_hw_interrupt_handler;
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}
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}
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/**
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* This function will mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_mask(int vector)
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{
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/* mask interrupt */
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(gs232_hw0_icregs+(vector>>5))->int_en &= ~(1 << (vector&0x1f));
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}
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/**
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* This function will un-mask a interrupt.
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* @param vector the interrupt number
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*/
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void rt_hw_interrupt_umask(int vector)
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{
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(gs232_hw0_icregs+(vector>>5))->int_en |= (1 << (vector&0x1f));
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}
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/**
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* This function will install a interrupt service routine to a interrupt.
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* @param vector the interrupt number
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* @param new_handler the interrupt service routine to be installed
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* @param old_handler the old interrupt service routine
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*/
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rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
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void *param, const char *name)
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{
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rt_isr_handler_t old_handler = RT_NULL;
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if (vector >= 0 && vector < MAX_INTR)
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{
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old_handler = irq_handle_table[vector].handler;
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#ifdef RT_USING_INTERRUPT_INFO
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rt_strncpy(irq_handle_table[vector].name, name, RT_NAME_MAX);
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#endif /* RT_USING_INTERRUPT_INFO */
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irq_handle_table[vector].handler = handler;
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irq_handle_table[vector].param = param;
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}
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return old_handler;
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}
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/**
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* Call ISR
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* @IRQn ID of IRQ
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*/
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void gs232_do_IRQ(int IRQn)
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{
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rt_isr_handler_t irq_func;
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void *param;
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irq_func = irq_handle_table[IRQn].handler;
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param = irq_handle_table[IRQn].param;
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irq_func(IRQn, param);
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#ifdef RT_USING_INTERRUPT_INFO
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irq_handle_table[IRQn].counter++;
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#endif
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return ;
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}
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void rt_do_mips_cpu_irq(rt_uint32_t ip)
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{
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rt_uint32_t intstatus, irq, n;
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if (ip == 7) {
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rt_hw_timer_handler();
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} else {
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n = ip - 2;
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/* Receive interrupt signal, compute the irq */
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intstatus = (gs232_hw0_icregs+n)->int_isr & (gs232_hw0_icregs+n)->int_en;
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if (0 == intstatus)
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return ;
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irq = __rt_ffs(intstatus) - 1;
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gs232_do_IRQ((n<<5) + irq);
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/* ack interrupt */
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(gs232_hw0_icregs+n)->int_clr |= (1 << irq);
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}
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}
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/*@}*/
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