Release 4.14 arch/mips/jazz/irq.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1992 Linus Torvalds
 * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle
 */
#include <linux/clockchips.h>
#include <linux/i8253.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/irq.h>

#include <asm/irq_cpu.h>
#include <asm/i8259.h>
#include <asm/io.h>
#include <asm/jazz.h>
#include <asm/pgtable.h>
#include <asm/tlbmisc.h>

static DEFINE_RAW_SPINLOCK(r4030_lock);



static void enable_r4030_irq(struct irq_data *d)
{
	unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START);
	unsigned long flags;

	raw_spin_lock_irqsave(&r4030_lock, flags);
	mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
	raw_spin_unlock_irqrestore(&r4030_lock, flags);
}

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6
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2
3.39%
1
25.00%
Thomas Bogendoerfer
1
1.69%
1
25.00%
Total
59
100.00%
4
100.00%



void disable_r4030_irq(struct irq_data *d)
{
	unsigned int mask = ~(1 << (d->irq - JAZZ_IRQ_START));
	unsigned long flags;

	raw_spin_lock_irqsave(&r4030_lock, flags);
	mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE);
	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask);
	raw_spin_unlock_irqrestore(&r4030_lock, flags);
}

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52
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Thomas Gleixner
6
9.84%
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Ralf Bächle
2
3.28%
1
25.00%
Thomas Bogendoerfer
1
1.64%
1
25.00%
Total
61
100.00%
4
100.00%


static struct irq_chip r4030_irq_type = {
	.name = "R4030",
	.irq_mask = disable_r4030_irq,
	.irq_unmask = enable_r4030_irq,
};



void __init init_r4030_ints(void)
{
	int i;

	for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++)
		irq_set_chip_and_handler(i, &r4030_irq_type, handle_level_irq);

	r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0);
	r4030_read_reg16(JAZZ_IO_IRQ_SOURCE);		/* clear pending IRQs */
	r4030_read_reg32(JAZZ_R4030_INVAL_ADDR);	/* clear error bits */
}

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5
9.43%
2
40.00%
Thomas Bogendoerfer
2
3.77%
1
20.00%
Thomas Gleixner
1
1.89%
1
20.00%
Total
53
100.00%
5
100.00%

/*
 * On systems with i8259-style interrupt controllers we assume for
 * driver compatibility reasons interrupts 0 - 15 to be the i8259
 * interrupts even if the hardware uses a different interrupt numbering.
 */


void __init arch_init_irq(void)
{
	/*
         * this is a hack to get back the still needed wired mapping
         * killed by init_mm()
         */

	/* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */
	add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K);
	/* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */
	add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M);
	/* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */
	add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M);

	init_i8259_irqs();			/* Integrated i8259  */
	mips_cpu_irq_init();
	init_r4030_ints();

	change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1);
}

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23
35.94%
2
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Linus Torvalds
6
9.38%
1
20.00%
Andrew Morton
2
3.12%
1
20.00%
Total
64
100.00%
5
100.00%



asmlinkage void plat_irq_dispatch(void)
{
	unsigned int pending = read_c0_cause() & read_c0_status();
	unsigned int irq;

	if (pending & IE_IRQ4) {
		r4030_read_reg32(JAZZ_TIMER_REGISTER);
		do_IRQ(JAZZ_TIMER_IRQ);
	} else if (pending & IE_IRQ2) {
		irq = *(volatile u8 *)JAZZ_EISA_IRQ_ACK;
		do_IRQ(irq);
	} else if (pending & IE_IRQ1) {
		irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2;
		if (likely(irq > 0))
			do_IRQ(irq + JAZZ_IRQ_START - 1);
		else
			panic("Unimplemented loc_no_irq handler");
	}
}

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69
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2
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Thomas Bogendoerfer
40
36.70%
2
50.00%
Total
109
100.00%
4
100.00%


struct clock_event_device r4030_clockevent = {
	.name		= "r4030",
	.features	= CLOCK_EVT_FEAT_PERIODIC,
	.rating		= 300,
	.irq		= JAZZ_TIMER_IRQ,
};



static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id)
{
	struct clock_event_device *cd = dev_id;

	cd->event_handler(cd);
	return IRQ_HANDLED;
}

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1
50.00%
Thomas Bogendoerfer
10
33.33%
1
50.00%
Total
30
100.00%
2
100.00%


static struct irqaction r4030_timer_irqaction = {
	.handler	= r4030_timer_interrupt,
	.flags		= IRQF_TIMER,
	.name		= "R4030 timer",
};



void __init plat_time_init(void)
{
	struct clock_event_device *cd = &r4030_clockevent;
	struct irqaction *action = &r4030_timer_irqaction;
	unsigned int cpu = smp_processor_id();

	BUG_ON(HZ != 100);

	cd->cpumask		= cpumask_of(cpu);
	clockevents_register_device(cd);
	action->dev_id = cd;
	setup_irq(JAZZ_TIMER_IRQ, action);

	/*
         * Set clock to 100Hz.
         *
         * The R4030 timer receives an input clock of 1kHz which is divieded by
         * a programmable 4-bit divider.  This makes it fairly inflexible.
         */
	r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9);
	setup_pit_timer();
}
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Thomas Bogendoerfer
38
50.00%
1
25.00%
Ralf Bächle
37
48.68%
2
50.00%
Rusty Russell
1
1.32%
1
25.00%
Total
76
100.00%
4
100.00%

Overall Contributors
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Ralf Bächle
228
39.86%
13
52.00%
Andrew Morton
161
28.15%
1
4.00%
Thomas Bogendoerfer
133
23.25%
2
8.00%
Linus Torvalds
23
4.02%
1
4.00%
Thomas Gleixner
15
2.62%
2
8.00%
Atsushi Nemoto
7
1.22%
3
12.00%
David Howells
3
0.52%
1
4.00%
Rusty Russell
1
0.17%
1
4.00%
Wu Zhangjin
1
0.17%
1
4.00%
Total
572
100.00%
25
100.00%
Directory: arch/mips/jazz

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