Contributors: 8
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Linus Torvalds (pre-git) |
372 |
48.06% |
3 |
15.79% |
| Roman Zippel |
241 |
31.14% |
1 |
5.26% |
| Geert Uytterhoeven |
108 |
13.95% |
8 |
42.11% |
| Finn Thain |
33 |
4.26% |
1 |
5.26% |
| Linus Torvalds |
11 |
1.42% |
2 |
10.53% |
| Al Viro |
4 |
0.52% |
1 |
5.26% |
| Thomas Gleixner |
4 |
0.52% |
2 |
10.53% |
| Andrew Morton |
1 |
0.13% |
1 |
5.26% |
| Total |
774 |
|
19 |
|
/*
* linux/arch/m68k/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/errno.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>
struct ciabase {
volatile struct CIA *cia;
unsigned char icr_mask, icr_data;
unsigned short int_mask;
int handler_irq, cia_irq, server_irq;
char *name;
} ciaa_base = {
.cia = &ciaa,
.int_mask = IF_PORTS,
.handler_irq = IRQ_AMIGA_PORTS,
.cia_irq = IRQ_AMIGA_CIAA,
.name = "CIAA"
}, ciab_base = {
.cia = &ciab,
.int_mask = IF_EXTER,
.handler_irq = IRQ_AMIGA_EXTER,
.cia_irq = IRQ_AMIGA_CIAB,
.name = "CIAB"
};
/*
* Cause or clear CIA interrupts, return old interrupt status.
*/
unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
{
unsigned 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)
amiga_custom.intreq = IF_SETCLR | base->int_mask;
return old & base->icr_mask;
}
/*
* Enable or disable CIA interrupts, return old interrupt mask,
*/
unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
{
unsigned 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)
amiga_custom.intreq = IF_SETCLR | base->int_mask;
return old;
}
static irqreturn_t cia_handler(int irq, void *dev_id)
{
struct ciabase *base = dev_id;
int mach_irq;
unsigned char ints;
unsigned long flags;
/* Interrupts get disabled while the timer irq flag is cleared and
* the timer interrupt serviced.
*/
mach_irq = base->cia_irq;
local_irq_save(flags);
ints = cia_set_irq(base, CIA_ICR_ALL);
amiga_custom.intreq = base->int_mask;
if (ints & 1)
generic_handle_irq(mach_irq);
local_irq_restore(flags);
mach_irq++, ints >>= 1;
for (; ints; mach_irq++, ints >>= 1) {
if (ints & 1)
generic_handle_irq(mach_irq);
}
return IRQ_HANDLED;
}
static void cia_irq_enable(struct irq_data *data)
{
unsigned int irq = data->irq;
unsigned char mask;
if (irq >= IRQ_AMIGA_CIAB) {
mask = 1 << (irq - IRQ_AMIGA_CIAB);
cia_set_irq(&ciab_base, mask);
cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
} else {
mask = 1 << (irq - IRQ_AMIGA_CIAA);
cia_set_irq(&ciaa_base, mask);
cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
}
}
static void cia_irq_disable(struct irq_data *data)
{
unsigned int irq = data->irq;
if (irq >= IRQ_AMIGA_CIAB)
cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
else
cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
}
static struct irq_chip cia_irq_chip = {
.name = "cia",
.irq_enable = cia_irq_enable,
.irq_disable = cia_irq_disable,
};
/*
* Override auto irq 2 & 6 and use them as general chain
* for external interrupts, we link the CIA interrupt sources
* into this chain.
*/
static void auto_irq_enable(struct irq_data *data)
{
switch (data->irq) {
case IRQ_AUTO_2:
amiga_custom.intena = IF_SETCLR | IF_PORTS;
break;
case IRQ_AUTO_6:
amiga_custom.intena = IF_SETCLR | IF_EXTER;
break;
}
}
static void auto_irq_disable(struct irq_data *data)
{
switch (data->irq) {
case IRQ_AUTO_2:
amiga_custom.intena = IF_PORTS;
break;
case IRQ_AUTO_6:
amiga_custom.intena = IF_EXTER;
break;
}
}
static struct irq_chip auto_irq_chip = {
.name = "auto",
.irq_enable = auto_irq_enable,
.irq_disable = auto_irq_disable,
};
void __init cia_init_IRQ(struct ciabase *base)
{
m68k_setup_irq_controller(&cia_irq_chip, handle_simple_irq,
base->cia_irq, CIA_IRQS);
/* clear any pending interrupt and turn off all interrupts */
cia_set_irq(base, CIA_ICR_ALL);
cia_able_irq(base, CIA_ICR_ALL);
/* override auto int and install CIA handler */
m68k_setup_irq_controller(&auto_irq_chip, handle_simple_irq,
base->handler_irq, 1);
m68k_irq_startup_irq(base->handler_irq);
if (request_irq(base->handler_irq, cia_handler, IRQF_SHARED,
base->name, base))
pr_err("Couldn't register %s interrupt\n", base->name);
}