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// SPDX-License-Identifier: GPL-2.0-only
/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
*
* Routines for generic manipulation of the interrupts found on the
* Lasat boards.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/irq_cpu.h>
#include <asm/lasat/lasat.h>
#include <asm/lasat/lasatint.h>
#include <irq.h>
static volatile int *lasat_int_status;
static volatile int *lasat_int_mask;
static volatile int lasat_int_mask_shift;
void disable_lasat_irq(struct irq_data *d)
{
unsigned int irq_nr = d->irq - LASAT_IRQ_BASE;
*lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift;
}
void enable_lasat_irq(struct irq_data *d)
{
unsigned int irq_nr = d->irq - LASAT_IRQ_BASE;
*lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift;
}
static struct irq_chip lasat_irq_type = {
.name = "Lasat",
.irq_mask = disable_lasat_irq,
.irq_unmask = enable_lasat_irq,
};
static inline int ls1bit32(unsigned int x)
{
int b = 31, s;
s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s;
s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s;
s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s;
s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s;
s = 1; if (x << 1 == 0) s = 0; b -= s;
return b;
}
static unsigned long (*get_int_status)(void);
static unsigned long get_int_status_100(void)
{
return *lasat_int_status & *lasat_int_mask;
}
static unsigned long get_int_status_200(void)
{
unsigned long int_status;
int_status = *lasat_int_status;
int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff;
return int_status;
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned long int_status;
unsigned int cause = read_c0_cause();
int irq;
if (cause & CAUSEF_IP7) { /* R4000 count / compare IRQ */
do_IRQ(7);
return;
}
int_status = get_int_status();
/* if int_status == 0, then the interrupt has already been cleared */
if (int_status) {
irq = LASAT_IRQ_BASE + ls1bit32(int_status);
do_IRQ(irq);
}
}
void __init arch_init_irq(void)
{
int irq = LASAT_CASCADE_IRQ;
int i;
if (IS_LASAT_200()) {
lasat_int_status = (void *)LASAT_INT_STATUS_REG_200;
lasat_int_mask = (void *)LASAT_INT_MASK_REG_200;
lasat_int_mask_shift = LASATINT_MASK_SHIFT_200;
get_int_status = get_int_status_200;
*lasat_int_mask &= 0xffff;
} else {
lasat_int_status = (void *)LASAT_INT_STATUS_REG_100;
lasat_int_mask = (void *)LASAT_INT_MASK_REG_100;
lasat_int_mask_shift = LASATINT_MASK_SHIFT_100;
get_int_status = get_int_status_100;
*lasat_int_mask = 0;
}
mips_cpu_irq_init();
for (i = LASAT_IRQ_BASE; i <= LASAT_IRQ_END; i++)
irq_set_chip_and_handler(i, &lasat_irq_type, handle_level_irq);
if (request_irq(irq, no_action, IRQF_NO_THREAD, "cascade", NULL))
pr_err("Failed to request irq %d (cascade)\n", irq);
}
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