442 lines
10 KiB
C
442 lines
10 KiB
C
/*
|
|
* Macintosh interrupts
|
|
*
|
|
* General design:
|
|
* In contrary to the Amiga and Atari platforms, the Mac hardware seems to
|
|
* exclusively use the autovector interrupts (the 'generic level0-level7'
|
|
* interrupts with exception vectors 0x19-0x1f). The following interrupt levels
|
|
* are used:
|
|
* 1 - VIA1
|
|
* - slot 0: one second interrupt (CA2)
|
|
* - slot 1: VBlank (CA1)
|
|
* - slot 2: ADB data ready (SR full)
|
|
* - slot 3: ADB data (CB2)
|
|
* - slot 4: ADB clock (CB1)
|
|
* - slot 5: timer 2
|
|
* - slot 6: timer 1
|
|
* - slot 7: status of IRQ; signals 'any enabled int.'
|
|
*
|
|
* 2 - VIA2 or RBV
|
|
* - slot 0: SCSI DRQ (CA2)
|
|
* - slot 1: NUBUS IRQ (CA1) need to read port A to find which
|
|
* - slot 2: /EXP IRQ (only on IIci)
|
|
* - slot 3: SCSI IRQ (CB2)
|
|
* - slot 4: ASC IRQ (CB1)
|
|
* - slot 5: timer 2 (not on IIci)
|
|
* - slot 6: timer 1 (not on IIci)
|
|
* - slot 7: status of IRQ; signals 'any enabled int.'
|
|
*
|
|
* 2 - OSS (IIfx only?)
|
|
* - slot 0: SCSI interrupt
|
|
* - slot 1: Sound interrupt
|
|
*
|
|
* Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
|
|
*
|
|
* 3 - unused (?)
|
|
*
|
|
* 4 - SCC
|
|
*
|
|
* 5 - unused (?)
|
|
* [serial errors or special conditions seem to raise level 6
|
|
* interrupts on some models (LC4xx?)]
|
|
*
|
|
* 6 - off switch (?)
|
|
*
|
|
* For OSS Macintoshes (IIfx only at this point):
|
|
*
|
|
* 3 - Nubus interrupt
|
|
* - slot 0: Slot $9
|
|
* - slot 1: Slot $A
|
|
* - slot 2: Slot $B
|
|
* - slot 3: Slot $C
|
|
* - slot 4: Slot $D
|
|
* - slot 5: Slot $E
|
|
*
|
|
* 4 - SCC IOP
|
|
*
|
|
* 5 - ISM IOP (ADB?)
|
|
*
|
|
* 6 - unused
|
|
*
|
|
* For PSC Macintoshes (660AV, 840AV):
|
|
*
|
|
* 3 - PSC level 3
|
|
* - slot 0: MACE
|
|
*
|
|
* 4 - PSC level 4
|
|
* - slot 1: SCC channel A interrupt
|
|
* - slot 2: SCC channel B interrupt
|
|
* - slot 3: MACE DMA
|
|
*
|
|
* 5 - PSC level 5
|
|
*
|
|
* 6 - PSC level 6
|
|
*
|
|
* Finally we have good 'ole level 7, the non-maskable interrupt:
|
|
*
|
|
* 7 - NMI (programmer's switch on the back of some Macs)
|
|
* Also RAM parity error on models which support it (IIc, IIfx?)
|
|
*
|
|
* The current interrupt logic looks something like this:
|
|
*
|
|
* - We install dispatchers for the autovector interrupts (1-7). These
|
|
* dispatchers are responsible for querying the hardware (the
|
|
* VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using
|
|
* this information a machspec interrupt number is generated by placing the
|
|
* index of the interrupt hardware into the low three bits and the original
|
|
* autovector interrupt number in the upper 5 bits. The handlers for the
|
|
* resulting machspec interrupt are then called.
|
|
*
|
|
* - Nubus is a special case because its interrupts are hidden behind two
|
|
* layers of hardware. Nubus interrupts come in as index 1 on VIA #2,
|
|
* which translates to IRQ number 17. In this spot we install _another_
|
|
* dispatcher. This dispatcher finds the interrupting slot number (9-F) and
|
|
* then forms a new machspec interrupt number as above with the slot number
|
|
* minus 9 in the low three bits and the pseudo-level 7 in the upper five
|
|
* bits. The handlers for this new machspec interrupt number are then
|
|
* called. This puts Nubus interrupts into the range 56-62.
|
|
*
|
|
* - The Baboon interrupts (used on some PowerBooks) are an even more special
|
|
* case. They're hidden behind the Nubus slot $C interrupt thus adding a
|
|
* third layer of indirection. Why oh why did the Apple engineers do that?
|
|
*
|
|
* - We support "fast" and "slow" handlers, just like the Amiga port. The
|
|
* fast handlers are called first and with all interrupts disabled. They
|
|
* are expected to execute quickly (hence the name). The slow handlers are
|
|
* called last with interrupts enabled and the interrupt level restored.
|
|
* They must therefore be reentrant.
|
|
*
|
|
* TODO:
|
|
*
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/interrupt.h> /* for intr_count */
|
|
#include <linux/delay.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
#include <asm/system.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/bootinfo.h>
|
|
#include <asm/macintosh.h>
|
|
#include <asm/mac_via.h>
|
|
#include <asm/mac_psc.h>
|
|
#include <asm/hwtest.h>
|
|
#include <asm/errno.h>
|
|
#include <asm/macints.h>
|
|
#include <asm/irq_regs.h>
|
|
#include <asm/mac_oss.h>
|
|
|
|
#define SHUTUP_SONIC
|
|
|
|
/*
|
|
* VIA/RBV hooks
|
|
*/
|
|
|
|
extern void via_register_interrupts(void);
|
|
extern void via_irq_enable(int);
|
|
extern void via_irq_disable(int);
|
|
extern void via_irq_clear(int);
|
|
extern int via_irq_pending(int);
|
|
|
|
/*
|
|
* OSS hooks
|
|
*/
|
|
|
|
extern void oss_register_interrupts(void);
|
|
extern void oss_irq_enable(int);
|
|
extern void oss_irq_disable(int);
|
|
extern void oss_irq_clear(int);
|
|
extern int oss_irq_pending(int);
|
|
|
|
/*
|
|
* PSC hooks
|
|
*/
|
|
|
|
extern void psc_register_interrupts(void);
|
|
extern void psc_irq_enable(int);
|
|
extern void psc_irq_disable(int);
|
|
extern void psc_irq_clear(int);
|
|
extern int psc_irq_pending(int);
|
|
|
|
/*
|
|
* IOP hooks
|
|
*/
|
|
|
|
extern void iop_register_interrupts(void);
|
|
|
|
/*
|
|
* Baboon hooks
|
|
*/
|
|
|
|
extern int baboon_present;
|
|
|
|
extern void baboon_register_interrupts(void);
|
|
extern void baboon_irq_enable(int);
|
|
extern void baboon_irq_disable(int);
|
|
extern void baboon_irq_clear(int);
|
|
|
|
/*
|
|
* console_loglevel determines NMI handler function
|
|
*/
|
|
|
|
irqreturn_t mac_nmi_handler(int, void *);
|
|
irqreturn_t mac_debug_handler(int, void *);
|
|
|
|
/* #define DEBUG_MACINTS */
|
|
|
|
void mac_enable_irq(unsigned int irq);
|
|
void mac_disable_irq(unsigned int irq);
|
|
|
|
static struct irq_controller mac_irq_controller = {
|
|
.name = "mac",
|
|
.lock = __SPIN_LOCK_UNLOCKED(mac_irq_controller.lock),
|
|
.enable = mac_enable_irq,
|
|
.disable = mac_disable_irq,
|
|
};
|
|
|
|
void __init mac_init_IRQ(void)
|
|
{
|
|
#ifdef DEBUG_MACINTS
|
|
printk("mac_init_IRQ(): Setting things up...\n");
|
|
#endif
|
|
m68k_setup_irq_controller(&mac_irq_controller, IRQ_USER,
|
|
NUM_MAC_SOURCES - IRQ_USER);
|
|
/* Make sure the SONIC interrupt is cleared or things get ugly */
|
|
#ifdef SHUTUP_SONIC
|
|
printk("Killing onboard sonic... ");
|
|
/* This address should hopefully be mapped already */
|
|
if (hwreg_present((void*)(0x50f0a000))) {
|
|
*(long *)(0x50f0a014) = 0x7fffL;
|
|
*(long *)(0x50f0a010) = 0L;
|
|
}
|
|
printk("Done.\n");
|
|
#endif /* SHUTUP_SONIC */
|
|
|
|
/*
|
|
* Now register the handlers for the master IRQ handlers
|
|
* at levels 1-7. Most of the work is done elsewhere.
|
|
*/
|
|
|
|
if (oss_present)
|
|
oss_register_interrupts();
|
|
else
|
|
via_register_interrupts();
|
|
if (psc_present)
|
|
psc_register_interrupts();
|
|
if (baboon_present)
|
|
baboon_register_interrupts();
|
|
iop_register_interrupts();
|
|
if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
|
|
mac_nmi_handler))
|
|
pr_err("Couldn't register NMI\n");
|
|
#ifdef DEBUG_MACINTS
|
|
printk("mac_init_IRQ(): Done!\n");
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* mac_enable_irq - enable an interrupt source
|
|
* mac_disable_irq - disable an interrupt source
|
|
* mac_clear_irq - clears a pending interrupt
|
|
* mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending)
|
|
*
|
|
* These routines are just dispatchers to the VIA/OSS/PSC routines.
|
|
*/
|
|
|
|
void mac_enable_irq(unsigned int irq)
|
|
{
|
|
int irq_src = IRQ_SRC(irq);
|
|
|
|
switch(irq_src) {
|
|
case 1:
|
|
via_irq_enable(irq);
|
|
break;
|
|
case 2:
|
|
case 7:
|
|
if (oss_present)
|
|
oss_irq_enable(irq);
|
|
else
|
|
via_irq_enable(irq);
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
case 6:
|
|
if (psc_present)
|
|
psc_irq_enable(irq);
|
|
else if (oss_present)
|
|
oss_irq_enable(irq);
|
|
break;
|
|
case 4:
|
|
if (psc_present)
|
|
psc_irq_enable(irq);
|
|
break;
|
|
case 8:
|
|
if (baboon_present)
|
|
baboon_irq_enable(irq);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void mac_disable_irq(unsigned int irq)
|
|
{
|
|
int irq_src = IRQ_SRC(irq);
|
|
|
|
switch(irq_src) {
|
|
case 1:
|
|
via_irq_disable(irq);
|
|
break;
|
|
case 2:
|
|
case 7:
|
|
if (oss_present)
|
|
oss_irq_disable(irq);
|
|
else
|
|
via_irq_disable(irq);
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
case 6:
|
|
if (psc_present)
|
|
psc_irq_disable(irq);
|
|
else if (oss_present)
|
|
oss_irq_disable(irq);
|
|
break;
|
|
case 4:
|
|
if (psc_present)
|
|
psc_irq_disable(irq);
|
|
break;
|
|
case 8:
|
|
if (baboon_present)
|
|
baboon_irq_disable(irq);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void mac_clear_irq(unsigned int irq)
|
|
{
|
|
switch(IRQ_SRC(irq)) {
|
|
case 1:
|
|
via_irq_clear(irq);
|
|
break;
|
|
case 2:
|
|
case 7:
|
|
if (oss_present)
|
|
oss_irq_clear(irq);
|
|
else
|
|
via_irq_clear(irq);
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
case 6:
|
|
if (psc_present)
|
|
psc_irq_clear(irq);
|
|
else if (oss_present)
|
|
oss_irq_clear(irq);
|
|
break;
|
|
case 4:
|
|
if (psc_present)
|
|
psc_irq_clear(irq);
|
|
break;
|
|
case 8:
|
|
if (baboon_present)
|
|
baboon_irq_clear(irq);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int mac_irq_pending(unsigned int irq)
|
|
{
|
|
switch(IRQ_SRC(irq)) {
|
|
case 1:
|
|
return via_irq_pending(irq);
|
|
case 2:
|
|
case 7:
|
|
if (oss_present)
|
|
return oss_irq_pending(irq);
|
|
else
|
|
return via_irq_pending(irq);
|
|
case 3:
|
|
case 5:
|
|
case 6:
|
|
if (psc_present)
|
|
return psc_irq_pending(irq);
|
|
else if (oss_present)
|
|
return oss_irq_pending(irq);
|
|
break;
|
|
case 4:
|
|
if (psc_present)
|
|
psc_irq_pending(irq);
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(mac_irq_pending);
|
|
|
|
static int num_debug[8];
|
|
|
|
irqreturn_t mac_debug_handler(int irq, void *dev_id)
|
|
{
|
|
if (num_debug[irq] < 10) {
|
|
printk("DEBUG: Unexpected IRQ %d\n", irq);
|
|
num_debug[irq]++;
|
|
}
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int in_nmi;
|
|
static volatile int nmi_hold;
|
|
|
|
irqreturn_t mac_nmi_handler(int irq, void *dev_id)
|
|
{
|
|
int i;
|
|
/*
|
|
* generate debug output on NMI switch if 'debug' kernel option given
|
|
* (only works with Penguin!)
|
|
*/
|
|
|
|
in_nmi++;
|
|
for (i=0; i<100; i++)
|
|
udelay(1000);
|
|
|
|
if (in_nmi == 1) {
|
|
nmi_hold = 1;
|
|
printk("... pausing, press NMI to resume ...");
|
|
} else {
|
|
printk(" ok!\n");
|
|
nmi_hold = 0;
|
|
}
|
|
|
|
barrier();
|
|
|
|
while (nmi_hold == 1)
|
|
udelay(1000);
|
|
|
|
if (console_loglevel >= 8) {
|
|
#if 0
|
|
struct pt_regs *fp = get_irq_regs();
|
|
show_state();
|
|
printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
|
|
printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
|
|
fp->d0, fp->d1, fp->d2, fp->d3);
|
|
printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
|
|
fp->d4, fp->d5, fp->a0, fp->a1);
|
|
|
|
if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
|
|
printk("Corrupted stack page\n");
|
|
printk("Process %s (pid: %d, stackpage=%08lx)\n",
|
|
current->comm, current->pid, current->kernel_stack_page);
|
|
if (intr_count == 1)
|
|
dump_stack((struct frame *)fp);
|
|
#else
|
|
/* printk("NMI "); */
|
|
#endif
|
|
}
|
|
in_nmi--;
|
|
return IRQ_HANDLED;
|
|
}
|