u-boot/arch/m68k/lib/interrupts.c
Simon Glass c30b7adbca common: Move interrupt functions into a new header
These functions do not use driver model but are fairly widely used in
U-Boot. But it is not clear that they will use driver model anytime soon,
so we don't want to label them as 'legacy'.

Move them to a new irq_func.h header file. Avoid the name 'irq.h' since it
is widely used in U-Boot already.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2019-12-02 18:25:00 -05:00

99 lines
1.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2007 Freescale Semiconductor Inc
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*/
#include <common.h>
#include <irq_func.h>
#include <watchdog.h>
#include <asm/processor.h>
#include <asm/immap.h>
#define NR_IRQS (CONFIG_SYS_NUM_IRQS)
/*
* Interrupt vector functions.
*/
struct interrupt_action {
interrupt_handler_t *handler;
void *arg;
};
static struct interrupt_action irq_vecs[NR_IRQS];
static __inline__ unsigned short get_sr (void)
{
unsigned short sr;
asm volatile ("move.w %%sr,%0":"=r" (sr):);
return sr;
}
static __inline__ void set_sr (unsigned short sr)
{
asm volatile ("move.w %0,%%sr"::"r" (sr));
}
/************************************************************************/
/*
* Install and free an interrupt handler
*/
void irq_install_handler(int vec, interrupt_handler_t * handler, void *arg)
{
if ((vec < 0) || (vec >= NR_IRQS)) {
printf ("irq_install_handler: wrong interrupt vector %d\n",
vec);
return;
}
irq_vecs[vec].handler = handler;
irq_vecs[vec].arg = arg;
}
void irq_free_handler(int vec)
{
if ((vec < 0) || (vec >= NR_IRQS)) {
return;
}
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
}
void enable_interrupts(void)
{
unsigned short sr;
sr = get_sr ();
set_sr (sr & ~0x0700);
}
int disable_interrupts(void)
{
unsigned short sr;
sr = get_sr ();
set_sr (sr | 0x0700);
return ((sr & 0x0700) == 0); /* return true, if interrupts were enabled before */
}
void int_handler (struct pt_regs *fp)
{
int vec;
vec = (fp->vector >> 2) & 0xff;
if (vec > 0x40)
vec -= 0x40;
if (irq_vecs[vec].handler != NULL) {
irq_vecs[vec].handler (irq_vecs[vec].arg);
} else {
printf ("\nBogus External Interrupt Vector %d\n", vec);
}
}