ip22-int.c
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上传日期:2013-02-24
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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
- */
- #include <linux/config.h>
- #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>
- /*
- * 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.
- */
- 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);
- #ifdef CONFIG_REMOTE_DEBUG
- extern void rs_kgdb_hook(int);
- #endif
- unsigned long spurious_count = 0;
- /* 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)
- */
- void disable_local_irq(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- switch(irq_nr) {
- case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
- ioc_icontrol->imask0 &= ~(1 << irq_nr);
- break;
- case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15:
- ioc_icontrol->imask1 &= ~(1 << (irq_nr - 8));
- break;
- case 16: case 17: case 18: case 19: case 20: case 21: case 22: case 23:
- ioc_icontrol->cmeimask0 &= ~(1 << (irq_nr - 16));
- break;
- default:
- /* 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_irqn", irq_nr);
- panic("INVALID IRQ level!");
- };
- restore_flags(flags);
- }
- void enable_local_irq(unsigned int irq_nr)
- {
- unsigned long flags;
- save_and_cli(flags);
- switch(irq_nr) {
- case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
- ioc_icontrol->imask0 |= (1 << irq_nr);
- break;
- case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15:
- ioc_icontrol->imask1 |= (1 << (irq_nr - 8));
- break;
- case 16: case 17: case 18: case 19: case 20: case 21: case 22: case 23:
- enable_local_irq(7);
- ioc_icontrol->cmeimask0 |= (1 << (irq_nr - 16));
- break;
- default:
- printk("Yeeee, got passed irq_nr %d at disable_irqn", irq_nr);
- panic("INVALID IRQ level!");
- };
- restore_flags(flags);
- }
- void disable_gio_irq(unsigned int irq_nr)
- {
- /* XXX TODO XXX */
- }
- void enable_gio_irq(unsigned int irq_nr)
- {
- /* XXX TODO XXX */
- }
- void disable_hpcdma_irq(unsigned int irq_nr)
- {
- /* XXX TODO XXX */
- }
- void enable_hpcdma_irq(unsigned int irq_nr)
- {
- /* XXX TODO XXX */
- }
- void disable_irq(unsigned int irq_nr)
- {
- unsigned int n = irq_nr;
- if(n >= SGINT_END) {
- printk("whee, invalid irq_nr %dn", irq_nr);
- panic("IRQ, you lose...");
- }
- if(n >= SGINT_LOCAL0 && n < SGINT_GIO) {
- disable_local_irq(n - SGINT_LOCAL0);
- } else if(n >= SGINT_GIO && n < SGINT_HPCDMA) {
- disable_gio_irq(n - SGINT_GIO);
- } else if(n >= SGINT_HPCDMA && n < SGINT_END) {
- disable_hpcdma_irq(n - SGINT_HPCDMA);
- } else {
- panic("how did I get here?");
- }
- }
- void enable_irq(unsigned int irq_nr)
- {
- unsigned int n = irq_nr;
- if(n >= SGINT_END) {
- printk("whee, invalid irq_nr %dn", irq_nr);
- panic("IRQ, you lose...");
- }
- if(n >= SGINT_LOCAL0 && n < SGINT_GIO) {
- enable_local_irq(n - SGINT_LOCAL0);
- } else if(n >= SGINT_GIO && n < SGINT_HPCDMA) {
- enable_gio_irq(n - SGINT_GIO);
- } else if(n >= SGINT_HPCDMA && n < SGINT_END) {
- enable_hpcdma_irq(n - SGINT_HPCDMA);
- } else {
- panic("how did I get here?");
- }
- }
- #if 0
- /*
- * Currently unused.
- */
- static void local_unex(int irq, void *data, struct pt_regs *regs)
- {
- printk("Whee: unexpected local IRQ at %08lxn",
- (unsigned long) regs->cp0_epc);
- printk("DUMP: stat0<%x> stat1<%x> vmeistat<%x>n",
- ioc_icontrol->istat0, ioc_icontrol->istat1,
- ioc_icontrol->vmeistat);
- }
- #endif
- static struct irqaction *local_irq_action[24] = {
- NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL
- };
- int setup_indy_irq(int irq, struct irqaction * new)
- {
- printk("setup_indy_irq: Yeee, don't know how to setup irq<%d> for %s %pn",
- irq, new->name, new->handler);
- return 0;
- }
- 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
- };
- int get_irq_list(char *buf)
- {
- int i, len = 0;
- int num = 0;
- struct irqaction * action;
- for (i = 0 ; i < 16 ; i++, num++) {
- action = irq_action[i];
- if (!action)
- continue;
- len += sprintf(buf+len, "%2d: %8d %c %s",
- num, kstat.irqs[0][num],
- (action->flags & SA_INTERRUPT) ? '+' : ' ',
- action->name);
- for (action=action->next; action; action = action->next) {
- len += sprintf(buf+len, ",%s %s",
- (action->flags & SA_INTERRUPT) ? " +" : "",
- action->name);
- }
- len += sprintf(buf+len, " [on-chip]n");
- }
- for (i = 0 ; i < 24 ; i++, num++) {
- action = local_irq_action[i];
- if (!action)
- continue;
- len += sprintf(buf+len, "%2d: %8d %c %s",
- num, kstat.irqs[0][num],
- (action->flags & SA_INTERRUPT) ? '+' : ' ',
- action->name);
- for (action=action->next; action; action = action->next) {
- len += sprintf(buf+len, ",%s %s",
- (action->flags & SA_INTERRUPT) ? " +" : "",
- action->name);
- }
- len += sprintf(buf+len, " [local]n");
- }
- return len;
- }
- /*
- * do_IRQ handles IRQ's that have been installed without the
- * SA_INTERRUPT flag: it uses the full signal-handling return
- * and runs with other interrupts enabled. All relatively slow
- * IRQ's should use this format: notably the keyboard/timer
- * routines.
- */
- asmlinkage void do_IRQ(int irq, struct pt_regs * regs)
- {
- struct irqaction *action;
- int do_random, cpu;
- cpu = smp_processor_id();
- irq_enter(cpu, irq);
- kstat.irqs[0][irq]++;
- panic(KERN_DEBUG "Got irq %d, press a key.", irq);
- /*
- * mask and ack quickly, we don't want the irq controller
- * thinking we're snobs just because some other CPU has
- * disabled global interrupts (we have already done the
- * INT_ACK cycles, it's too late to try to pretend to the
- * controller that we aren't taking the interrupt).
- *
- * Commented out because we've already done this in the
- * machinespecific part of the handler. It's reasonable to
- * do this here in a highlevel language though because that way
- * we could get rid of a good part of duplicated code ...
- */
- /* mask_and_ack_irq(irq); */
- action = *(irq + irq_action);
- if (action) {
- if (!(action->flags & SA_INTERRUPT))
- __sti();
- action = *(irq + irq_action);
- do_random = 0;
- do {
- do_random |= action->flags;
- action->handler(irq, action->dev_id, regs);
- action = action->next;
- } while (action);
- if (do_random & SA_SAMPLE_RANDOM)
- add_interrupt_randomness(irq);
- __cli();
- }
- irq_exit(cpu, irq);
- /* unmasking and bottom half handling is done magically for us. */
- }
- int request_local_irq(unsigned int lirq, void (*func)(int, void *, struct pt_regs *),
- unsigned long iflags, const char *dname, void *devid)
- {
- struct irqaction *action;
- lirq -= SGINT_LOCAL0;
- if(lirq >= 24 || !func)
- return -EINVAL;
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if(!action)
- return -ENOMEM;
- action->handler = func;
- action->flags = iflags;
- action->mask = 0;
- action->name = dname;
- action->dev_id = devid;
- action->next = 0;
- local_irq_action[lirq] = action;
- enable_irq(lirq + SGINT_LOCAL0);
- return 0;
- }
- void free_local_irq(unsigned int lirq, void *dev_id)
- {
- struct irqaction *action;
- lirq -= SGINT_LOCAL0;
- if(lirq >= 24) {
- printk("Aieee: trying to free bogus local irq %dn",
- lirq + SGINT_LOCAL0);
- return;
- }
- action = local_irq_action[lirq];
- local_irq_action[lirq] = NULL;
- disable_irq(lirq + SGINT_LOCAL0);
- kfree(action);
- }
- int request_irq(unsigned int irq,
- void (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags,
- const char * devname,
- void *dev_id)
- {
- int retval;
- struct irqaction * action;
- if (irq >= SGINT_END)
- return -EINVAL;
- if (!handler)
- return -EINVAL;
- if((irq >= SGINT_LOCAL0) && (irq < SGINT_GIO))
- return request_local_irq(irq, handler, irqflags, devname, dev_id);
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction), GFP_KERNEL);
- if (!action)
- return -ENOMEM;
- action->handler = handler;
- action->flags = irqflags;
- action->mask = 0;
- action->name = devname;
- action->next = NULL;
- action->dev_id = dev_id;
- retval = setup_indy_irq(irq, action);
- if (retval)
- kfree(action);
- return retval;
- }
-
- void free_irq(unsigned int irq, void *dev_id)
- {
- struct irqaction * action, **p;
- unsigned long flags;
- if (irq >= SGINT_END) {
- printk("Trying to free IRQ%dn",irq);
- return;
- }
- if((irq >= SGINT_LOCAL0) && (irq < SGINT_GIO)) {
- free_local_irq(irq, dev_id);
- return;
- }
- for (p = irq + irq_action; (action = *p) != NULL; p = &action->next) {
- if (action->dev_id != dev_id)
- continue;
- /* Found it - now free it */
- save_and_cli(flags);
- *p = action->next;
- restore_flags(flags);
- kfree(action);
- return;
- }
- printk("Trying to free free IRQ%dn",irq);
- }
- void indy_local0_irqdispatch(struct pt_regs *regs)
- {
- struct irqaction *action;
- unsigned char mask = ioc_icontrol->istat0;
- unsigned char mask2 = 0;
- int irq, cpu = smp_processor_id();;
- mask &= ioc_icontrol->imask0;
- if(mask & ISTAT0_LIO2) {
- mask2 = ioc_icontrol->vmeistat;
- mask2 &= ioc_icontrol->cmeimask0;
- irq = lc2msk_to_irqnr[mask2];
- action = local_irq_action[irq];
- } else {
- irq = lc0msk_to_irqnr[mask];
- action = local_irq_action[irq];
- }
- irq_enter(cpu, irq);
- kstat.irqs[0][irq + 16]++;
- action->handler(irq, action->dev_id, regs);
- irq_exit(cpu, irq);
- }
- void indy_local1_irqdispatch(struct pt_regs *regs)
- {
- struct irqaction *action;
- unsigned char mask = ioc_icontrol->istat1;
- unsigned char mask2 = 0;
- int irq, cpu = smp_processor_id();;
- 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];
- action = local_irq_action[irq];
- } else {
- irq = lc1msk_to_irqnr[mask];
- action = local_irq_action[irq];
- }
- irq_enter(cpu, irq);
- kstat.irqs[0][irq + 24]++;
- action->handler(irq, action->dev_id, regs);
- irq_exit(cpu, irq);
- }
- 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 yetn");
- show_regs(regs);
- printk("Spinning...n");
- while(1);
- irq_exit(cpu, irq);
- }
- /* Misc. crap just to keep the kernel linking... */
- unsigned long probe_irq_on (void)
- {
- return 0;
- }
- int probe_irq_off (unsigned long irqs)
- {
- return 0;
- }
- static inline void sgint_init(void)
- {
- int i;
- #ifdef CONFIG_REMOTE_DEBUG
- char *ctype;
- #endif
- 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;
- /* Now safe to set the exception vector. */
- set_except_vector(0, indyIRQ);
- #ifdef CONFIG_REMOTE_DEBUG
- ctype = prom_getcmdline();
- for(i = 0; i < strlen(ctype); i++) {
- if(ctype[i]=='k' && ctype[i+1]=='g' &&
- ctype[i+2]=='d' && ctype[i+3]=='b' &&
- ctype[i+4]=='=' && ctype[i+5]=='t' &&
- ctype[i+6]=='t' && ctype[i+7]=='y' &&
- ctype[i+8]=='d' &&
- (ctype[i+9] == '1' || ctype[i+9] == '2')) {
- printk("KGDB: Using serial line /dev/ttyd%d for "
- "sessionn", (ctype[i+9] - '0'));
- if(ctype[i+9]=='1')
- rs_kgdb_hook(1);
- else if(ctype[i+9]=='2')
- rs_kgdb_hook(0);
- else {
- printk("KGDB: whoops bogon tty line "
- "requested, disabling sessionn");
- }
- }
- }
- #endif
- }
- void __init init_IRQ(void)
- {
- sgint_init();
- }