mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 18:26:39 +07:00
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!
179 lines
4.0 KiB
C
179 lines
4.0 KiB
C
/*
|
|
* arch/ppc/amiga/cia.c - CIA support
|
|
*
|
|
* Copyright (C) 1996 Roman Zippel
|
|
*
|
|
* The concept of some functions bases on the original Amiga OS function
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/amigahw.h>
|
|
#include <asm/amigaints.h>
|
|
|
|
struct ciabase {
|
|
volatile struct CIA *cia;
|
|
u_char icr_mask, icr_data;
|
|
u_short int_mask;
|
|
int handler_irq, cia_irq, server_irq;
|
|
char *name;
|
|
} ciaa_base = {
|
|
&ciaa, 0, 0, IF_PORTS,
|
|
IRQ_AMIGA_AUTO_2, IRQ_AMIGA_CIAA,
|
|
IRQ_AMIGA_PORTS,
|
|
"CIAA handler"
|
|
}, ciab_base = {
|
|
&ciab, 0, 0, IF_EXTER,
|
|
IRQ_AMIGA_AUTO_6, IRQ_AMIGA_CIAB,
|
|
IRQ_AMIGA_EXTER,
|
|
"CIAB handler"
|
|
};
|
|
|
|
#define CIA_SET_BASE_ADJUST_IRQ(base, irq) \
|
|
do { \
|
|
if (irq >= IRQ_AMIGA_CIAB) { \
|
|
base = &ciab_base; \
|
|
irq -= IRQ_AMIGA_CIAB; \
|
|
} else { \
|
|
base = &ciaa_base; \
|
|
irq -= IRQ_AMIGA_CIAA; \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* Cause or clear CIA interrupts, return old interrupt status.
|
|
*/
|
|
|
|
static unsigned char cia_set_irq_private(struct ciabase *base,
|
|
unsigned char mask)
|
|
{
|
|
u_char old;
|
|
|
|
old = (base->icr_data |= base->cia->icr);
|
|
if (mask & CIA_ICR_SETCLR)
|
|
base->icr_data |= mask;
|
|
else
|
|
base->icr_data &= ~mask;
|
|
if (base->icr_data & base->icr_mask)
|
|
custom.intreq = IF_SETCLR | base->int_mask;
|
|
return old & base->icr_mask;
|
|
}
|
|
|
|
unsigned char cia_set_irq(unsigned int irq, int set)
|
|
{
|
|
struct ciabase *base;
|
|
unsigned char mask;
|
|
|
|
if (irq >= IRQ_AMIGA_CIAB)
|
|
mask = (1 << (irq - IRQ_AMIGA_CIAB));
|
|
else
|
|
mask = (1 << (irq - IRQ_AMIGA_CIAA));
|
|
mask |= (set) ? CIA_ICR_SETCLR : 0;
|
|
|
|
CIA_SET_BASE_ADJUST_IRQ(base, irq);
|
|
|
|
return cia_set_irq_private(base, mask);
|
|
}
|
|
|
|
unsigned char cia_get_irq_mask(unsigned int irq)
|
|
{
|
|
struct ciabase *base;
|
|
|
|
CIA_SET_BASE_ADJUST_IRQ(base, irq);
|
|
|
|
return base->cia->icr;
|
|
}
|
|
|
|
/*
|
|
* Enable or disable CIA interrupts, return old interrupt mask.
|
|
*/
|
|
|
|
static unsigned char cia_able_irq_private(struct ciabase *base,
|
|
unsigned char mask)
|
|
{
|
|
u_char old;
|
|
|
|
old = base->icr_mask;
|
|
base->icr_data |= base->cia->icr;
|
|
base->cia->icr = mask;
|
|
if (mask & CIA_ICR_SETCLR)
|
|
base->icr_mask |= mask;
|
|
else
|
|
base->icr_mask &= ~mask;
|
|
base->icr_mask &= CIA_ICR_ALL;
|
|
|
|
if (base->icr_data & base->icr_mask)
|
|
custom.intreq = IF_SETCLR | base->int_mask;
|
|
return old;
|
|
}
|
|
|
|
unsigned char cia_able_irq(unsigned int irq, int enable)
|
|
{
|
|
struct ciabase *base;
|
|
unsigned char mask;
|
|
|
|
if (irq >= IRQ_AMIGA_CIAB)
|
|
mask = (1 << (irq - IRQ_AMIGA_CIAB));
|
|
else
|
|
mask = (1 << (irq - IRQ_AMIGA_CIAA));
|
|
mask |= (enable) ? CIA_ICR_SETCLR : 0;
|
|
|
|
CIA_SET_BASE_ADJUST_IRQ(base, irq);
|
|
|
|
return cia_able_irq_private(base, mask);
|
|
}
|
|
|
|
static void cia_handler(int irq, void *dev_id, struct pt_regs *fp)
|
|
{
|
|
struct ciabase *base = (struct ciabase *)dev_id;
|
|
irq_desc_t *desc;
|
|
struct irqaction *action;
|
|
int i;
|
|
unsigned char ints;
|
|
|
|
irq = base->cia_irq;
|
|
desc = irq_desc + irq;
|
|
ints = cia_set_irq_private(base, CIA_ICR_ALL);
|
|
custom.intreq = base->int_mask;
|
|
for (i = 0; i < CIA_IRQS; i++, irq++) {
|
|
if (ints & 1) {
|
|
kstat_cpu(0).irqs[irq]++;
|
|
action = desc->action;
|
|
action->handler(irq, action->dev_id, fp);
|
|
}
|
|
ints >>= 1;
|
|
desc++;
|
|
}
|
|
amiga_do_irq_list(base->server_irq, fp);
|
|
}
|
|
|
|
void __init cia_init_IRQ(struct ciabase *base)
|
|
{
|
|
extern struct irqaction amiga_sys_irqaction[AUTO_IRQS];
|
|
struct irqaction *action;
|
|
|
|
/* clear any pending interrupt and turn off all interrupts */
|
|
cia_set_irq_private(base, CIA_ICR_ALL);
|
|
cia_able_irq_private(base, CIA_ICR_ALL);
|
|
|
|
/* install CIA handler */
|
|
action = &amiga_sys_irqaction[base->handler_irq-IRQ_AMIGA_AUTO];
|
|
action->handler = cia_handler;
|
|
action->dev_id = base;
|
|
action->name = base->name;
|
|
setup_irq(base->handler_irq, &amiga_sys_irqaction[base->handler_irq-IRQ_AMIGA_AUTO]);
|
|
|
|
custom.intena = IF_SETCLR | base->int_mask;
|
|
}
|