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/*
* indy_int.c: Routines for generic manipulation of the INT[23] ASIC
* found on INDY workstations..
*
* Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
* Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
* Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
* - Indigo2 changes
* - Interrupt handling fixes
*/
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <asm/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/sgi/sgi.h>
#include <asm/sgi/sgihpc.h>
#include <asm/sgi/sgint23.h>
#include <asm/sgialib.h>
#include <asm/gdb-stub.h>
/*
* Linux has a controller-independent x86 interrupt architecture.
* every controller has a 'controller-template', that is used
* by the main code to do the right thing. Each driver-visible
* interrupt source is transparently wired to the apropriate
* controller. Thus drivers need not be aware of the
* interrupt-controller.
*
* Various interrupt controllers we handle: 8259 PIC, SMP IO-APIC,
* PIIX4's internal 8259 PIC and SGI's Visual Workstation Cobalt (IO-)APIC.
* (IO-APICs assumed to be messaging to Pentium local-APICs)
*
* the code is designed to be easily extended with new/different
* interrupt controllers, without having to do assembly magic.
*/
/* #define DEBUG_SGINT */
struct sgi_int2_regs *sgi_i2regs;
struct sgi_int3_regs *sgi_i3regs;
struct sgi_ioc_ints *ioc_icontrol;
struct sgi_ioc_timers *ioc_timers;
volatile unsigned char *ioc_tclear;
static char lc0msk_to_irqnr[256];
static char lc1msk_to_irqnr[256];
static char lc2msk_to_irqnr[256];
static char lc3msk_to_irqnr[256];
extern asmlinkage void indyIRQ(void);
/* Local IRQ's are layed out logically like this:
*
* 0 --> 7 == local 0 interrupts
* 8 --> 15 == local 1 interrupts
* 16 --> 23 == vectored level 2 interrupts
* 24 --> 31 == vectored level 3 interrupts (not used)
*/
static void enable_local0_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
ioc_icontrol->imask0 |= (1 << (irq - SGINT_LOCAL0));
restore_flags(flags);
}
static unsigned int startup_local0_irq(unsigned int irq)
{
enable_local0_irq(irq);
return 0; /* Never anything pending */
}
static void disable_local0_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
ioc_icontrol->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
restore_flags(flags);
}
#define shutdown_local0_irq disable_local0_irq
#define mask_and_ack_local0_irq disable_local0_irq
static void end_local0_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_local0_irq(irq);
}
static struct hw_interrupt_type ip22_local0_irq_type = {
"IP22 local 0",
startup_local0_irq,
shutdown_local0_irq,
enable_local0_irq,
disable_local0_irq,
mask_and_ack_local0_irq,
end_local0_irq,
NULL
};
static void enable_local1_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
ioc_icontrol->imask1 |= (1 << (irq - SGINT_LOCAL1));
restore_flags(flags);
}
static unsigned int startup_local1_irq(unsigned int irq)
{
enable_local1_irq(irq);
return 0; /* Never anything pending */
}
void disable_local1_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
ioc_icontrol->imask1 &= ~(1 << (irq- SGINT_LOCAL1));
restore_flags(flags);
}
#define shutdown_local1_irq disable_local1_irq
#define mask_and_ack_local1_irq disable_local1_irq
static void end_local1_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_local1_irq(irq);
}
static struct hw_interrupt_type ip22_local1_irq_type = {
"IP22 local 1",
startup_local1_irq,
shutdown_local1_irq,
enable_local1_irq,
disable_local1_irq,
mask_and_ack_local1_irq,
end_local1_irq,
NULL
};
static void enable_local2_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
enable_local0_irq(7);
ioc_icontrol->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
restore_flags(flags);
}
static unsigned int startup_local2_irq(unsigned int irq)
{
enable_local2_irq(irq);
return 0; /* Never anything pending */
}
void disable_local2_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
ioc_icontrol->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
restore_flags(flags);
}
#define shutdown_local2_irq disable_local2_irq
#define mask_and_ack_local2_irq disable_local2_irq
static void end_local2_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_local2_irq(irq);
}
static struct hw_interrupt_type ip22_local2_irq_type = {
"IP22 local 2",
startup_local2_irq,
shutdown_local2_irq,
enable_local2_irq,
disable_local2_irq,
mask_and_ack_local2_irq,
end_local2_irq,
NULL
};
static void enable_local3_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
printk("Yeeee, got passed irq_nr %d at enable_local3_irq\n", irq);
panic("INVALID IRQ level!");
restore_flags(flags);
}
static unsigned int startup_local3_irq(unsigned int irq)
{
enable_local3_irq(irq);
return 0; /* Never anything pending */
}
void disable_local3_irq(unsigned int irq)
{
unsigned long flags;
save_and_cli(flags);
/*
* This way we'll see if anyone would ever want vectored level 3
* interrupts. Highly unlikely.
*/
printk("Yeeee, got passed irq_nr %d at disable_local3_irq\n", irq);
panic("INVALID IRQ level!");
restore_flags(flags);
}
#define shutdown_local3_irq disable_local3_irq
#define mask_and_ack_local3_irq disable_local3_irq
static void end_local3_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_local3_irq(irq);
}
static struct hw_interrupt_type ip22_local3_irq_type = {
"IP22 local 3",
startup_local3_irq,
shutdown_local3_irq,
enable_local3_irq,
disable_local3_irq,
mask_and_ack_local3_irq,
end_local3_irq,
NULL
};
void enable_gio_irq(unsigned int irq)
{
/* XXX TODO XXX */
}
static unsigned int startup_gio_irq(unsigned int irq)
{
enable_gio_irq(irq);
return 0; /* Never anything pending */
}
void disable_gio_irq(unsigned int irq)
{
/* XXX TODO XXX */
}
#define shutdown_gio_irq disable_gio_irq
#define mask_and_ack_gio_irq disable_gio_irq
static void end_gio_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_gio_irq(irq);
}
static struct hw_interrupt_type ip22_gio_irq_type = {
"IP22 GIO",
startup_gio_irq,
shutdown_gio_irq,
enable_gio_irq,
disable_gio_irq,
mask_and_ack_gio_irq,
end_gio_irq,
NULL
};
void enable_hpcdma_irq(unsigned int irq)
{
/* XXX TODO XXX */
}
static unsigned int startup_hpcdma_irq(unsigned int irq)
{
enable_hpcdma_irq(irq);
return 0; /* Never anything pending */
}
void disable_hpcdma_irq(unsigned int irq)
{
/* XXX TODO XXX */
}
#define shutdown_hpcdma_irq disable_hpcdma_irq
#define mask_and_ack_hpcdma_irq disable_hpcdma_irq
static void end_hpcdma_irq (unsigned int irq)
{
if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
enable_hpcdma_irq(irq);
}
static struct hw_interrupt_type ip22_hpcdma_irq_type = {
"IP22 HPC DMA",
startup_hpcdma_irq,
shutdown_hpcdma_irq,
enable_hpcdma_irq,
disable_hpcdma_irq,
mask_and_ack_hpcdma_irq,
end_hpcdma_irq,
NULL
};
static struct irqaction r4ktimer_action = {
NULL, 0, 0, "R4000 timer/counter", NULL, NULL,
};
static struct irqaction indy_berr_action = {
NULL, 0, 0, "IP22 Bus Error", NULL, NULL,
};
static struct irqaction *irq_action[16] = {
NULL, NULL, NULL, NULL,
NULL, NULL, &indy_berr_action, &r4ktimer_action,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL
};
void indy_local0_irqdispatch(struct pt_regs *regs)
{
unsigned char mask = ioc_icontrol->istat0;
unsigned char mask2 = 0;
int irq;
mask &= ioc_icontrol->imask0;
if (mask & ISTAT0_LIO2) {
mask2 = ioc_icontrol->vmeistat;
mask2 &= ioc_icontrol->cmeimask0;
irq = lc2msk_to_irqnr[mask2];
} else {
irq = lc0msk_to_irqnr[mask];
}
/* if irq == 0, then the interrupt has already been cleared */
if (irq == 0)
goto end;
do_IRQ(irq, regs);
goto end;
no_handler:
printk("No handler for local0 irq: %i\n", irq);
end:
return;
}
void indy_local1_irqdispatch(struct pt_regs *regs)
{
unsigned char mask = ioc_icontrol->istat1;
unsigned char mask2 = 0;
int irq;
mask &= ioc_icontrol->imask1;
if (mask & ISTAT1_LIO3) {
printk("WHee: Got an LIO3 irq, winging it...\n");
mask2 = ioc_icontrol->vmeistat;
mask2 &= ioc_icontrol->cmeimask1;
irq = lc3msk_to_irqnr[ioc_icontrol->vmeistat];
} else {
irq = lc1msk_to_irqnr[mask];
}
/* if irq == 0, then the interrupt has already been cleared */
/* not sure if it is needed here, but it is needed for local0 */
if (irq == 0)
goto end;
do_IRQ(irq, regs);
goto end;
no_handler:
printk("No handler for local1 irq: %i\n", irq);
end:
return;
}
void indy_buserror_irq(struct pt_regs *regs)
{
int cpu = smp_processor_id();
int irq = 6;
irq_enter(cpu, irq);
kstat.irqs[0][irq]++;
printk("Got a bus error IRQ, shouldn't happen yet\n");
show_regs(regs);
printk("Spinning...\n");
while(1);
irq_exit(cpu, irq);
}
void __init init_IRQ(void)
{
int i;
sgi_i2regs = (struct sgi_int2_regs *) (KSEG1 + SGI_INT2_BASE);
sgi_i3regs = (struct sgi_int3_regs *) (KSEG1 + SGI_INT3_BASE);
/* Init local mask --> irq tables. */
for (i = 0; i < 256; i++) {
if (i & 0x80) {
lc0msk_to_irqnr[i] = 7;
lc1msk_to_irqnr[i] = 15;
lc2msk_to_irqnr[i] = 23;
lc3msk_to_irqnr[i] = 31;
} else if (i & 0x40) {
lc0msk_to_irqnr[i] = 6;
lc1msk_to_irqnr[i] = 14;
lc2msk_to_irqnr[i] = 22;
lc3msk_to_irqnr[i] = 30;
} else if (i & 0x20) {
lc0msk_to_irqnr[i] = 5;
lc1msk_to_irqnr[i] = 13;
lc2msk_to_irqnr[i] = 21;
lc3msk_to_irqnr[i] = 29;
} else if (i & 0x10) {
lc0msk_to_irqnr[i] = 4;
lc1msk_to_irqnr[i] = 12;
lc2msk_to_irqnr[i] = 20;
lc3msk_to_irqnr[i] = 28;
} else if (i & 0x08) {
lc0msk_to_irqnr[i] = 3;
lc1msk_to_irqnr[i] = 11;
lc2msk_to_irqnr[i] = 19;
lc3msk_to_irqnr[i] = 27;
} else if (i & 0x04) {
lc0msk_to_irqnr[i] = 2;
lc1msk_to_irqnr[i] = 10;
lc2msk_to_irqnr[i] = 18;
lc3msk_to_irqnr[i] = 26;
} else if (i & 0x02) {
lc0msk_to_irqnr[i] = 1;
lc1msk_to_irqnr[i] = 9;
lc2msk_to_irqnr[i] = 17;
lc3msk_to_irqnr[i] = 25;
} else if (i & 0x01) {
lc0msk_to_irqnr[i] = 0;
lc1msk_to_irqnr[i] = 8;
lc2msk_to_irqnr[i] = 16;
lc3msk_to_irqnr[i] = 24;
} else {
lc0msk_to_irqnr[i] = 0;
lc1msk_to_irqnr[i] = 0;
lc2msk_to_irqnr[i] = 0;
lc3msk_to_irqnr[i] = 0;
}
}
/* Indy uses an INT3, Indigo2 uses an INT2 */
if (sgi_guiness) {
ioc_icontrol = &sgi_i3regs->ints;
ioc_timers = &sgi_i3regs->timers;
ioc_tclear = &sgi_i3regs->tclear;
} else {
ioc_icontrol = &sgi_i2regs->ints;
ioc_timers = &sgi_i2regs->timers;
ioc_tclear = &sgi_i2regs->tclear;
}
/* Mask out all interrupts. */
ioc_icontrol->imask0 = 0;
ioc_icontrol->imask1 = 0;
ioc_icontrol->cmeimask0 = 0;
ioc_icontrol->cmeimask1 = 0;
set_except_vector(0, indyIRQ);
init_generic_irq();
for (i = SGINT_LOCAL0; i < SGINT_END; i++) {
hw_irq_controller *handler;
if (i < SGINT_LOCAL1)
handler = &ip22_local0_irq_type;
else if (i < SGINT_LOCAL2)
handler = &ip22_local1_irq_type;
else if (i < SGINT_LOCAL3)
handler = &ip22_local2_irq_type;
else if (i < SGINT_GIO)
handler = &ip22_local3_irq_type;
else if (i < SGINT_HPCDMA)
handler = &ip22_gio_irq_type;
else if (i < SGINT_END)
handler = &ip22_hpcdma_irq_type;
irq_desc[i].status = IRQ_DISABLED;
irq_desc[i].action = 0;
irq_desc[i].depth = 1;
irq_desc[i].handler = handler;
}
}
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