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https://mirrors.bfsu.edu.cn/git/linux.git
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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1992 Linus Torvalds
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* Copyright (C) 1994 - 2001, 2003 Ralf Baechle
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <asm/i8259.h>
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#include <asm/io.h>
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#include <asm/jazz.h>
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extern asmlinkage void jazz_handle_int(void);
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static DEFINE_SPINLOCK(r4030_lock);
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static void enable_r4030_irq(unsigned int irq)
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{
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unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ);
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unsigned long flags;
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spin_lock_irqsave(&r4030_lock, flags);
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mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
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spin_unlock_irqrestore(&r4030_lock, flags);
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}
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static unsigned int startup_r4030_irq(unsigned int irq)
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{
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enable_r4030_irq(irq);
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return 0; /* never anything pending */
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}
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#define shutdown_r4030_irq disable_r4030_irq
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void disable_r4030_irq(unsigned int irq)
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{
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unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ));
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unsigned long flags;
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spin_lock_irqsave(&r4030_lock, flags);
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mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
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spin_unlock_irqrestore(&r4030_lock, flags);
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}
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#define mask_and_ack_r4030_irq disable_r4030_irq
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static void end_r4030_irq(unsigned int irq)
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{
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if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
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enable_r4030_irq(irq);
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}
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static struct hw_interrupt_type r4030_irq_type = {
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"R4030",
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startup_r4030_irq,
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shutdown_r4030_irq,
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enable_r4030_irq,
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disable_r4030_irq,
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mask_and_ack_r4030_irq,
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end_r4030_irq,
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NULL
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};
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void __init init_r4030_ints(void)
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{
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int i;
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for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) {
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irq_desc[i].status = IRQ_DISABLED;
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irq_desc[i].action = 0;
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irq_desc[i].depth = 1;
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irq_desc[i].handler = &r4030_irq_type;
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}
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
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r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */
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r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */
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}
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/*
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* On systems with i8259-style interrupt controllers we assume for
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* driver compatibility reasons interrupts 0 - 15 to be the i8259
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* interrupts even if the hardware uses a different interrupt numbering.
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*/
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void __init arch_init_irq(void)
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{
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set_except_vector(0, jazz_handle_int);
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init_i8259_irqs(); /* Integrated i8259 */
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init_r4030_ints();
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change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1);
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}
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