/*
* arch/sparc/kernel/sun4d_irq.c:
* SS1000/SC2000 interrupt handling.
*
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Heavily based on arch/sparc/kernel/irq.c.
*/
#include <linux/errno.h>
#include <linux/linkage.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/seq_file.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/psr.h>
#include <asm/smp.h>
#include <asm/vaddrs.h>
#include <asm/timer.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/traps.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/sbus.h>
#include <asm/sbi.h>
#include <asm/cacheflush.h>
#include <asm/irq_regs.h>
#include "irq.h"
/* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
/* #define DISTRIBUTE_IRQS */
struct sun4d_timer_regs *sun4d_timers;
#define TIMER_IRQ 10
#define MAX_STATIC_ALLOC 4
extern struct irqaction static_irqaction[MAX_STATIC_ALLOC];
extern int static_irq_count;
unsigned char cpu_leds[32];
#ifdef CONFIG_SMP
unsigned char sbus_tid[32];
#endif
static struct irqaction *irq_action[NR_IRQS];
extern spinlock_t irq_action_lock;
struct sbus_action {
struct irqaction *action;
/* For SMP this needs to be extended */
} *sbus_actions;
static int pil_to_sbus[] = {
0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
};
static int sbus_to_pil[] = {
0, 2, 3, 5, 7, 9, 11, 13,
};
static int nsbi;
#ifdef CONFIG_SMP
DEFINE_SPINLOCK(sun4d_imsk_lock);
#endif
int show_sun4d_interrupts(struct seq_file *p, void *v)
{
int i = *(loff_t *) v, j = 0, k = 0, sbusl;
struct irqaction * action;
unsigned long flags;
#ifdef CONFIG_SMP
int x;
#endif
spin_lock_irqsave(&irq_action_lock, flags);
if (i < NR_IRQS) {
sbusl = pil_to_sbus[i];
if (!sbusl) {
action = *(i + irq_action);
if (!action)
goto out_unlock;
} else {
for (j = 0; j < nsbi; j++) {
for (k = 0; k < 4; k++)
if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
goto found_it;
}
goto out_unlock;
}
found_it: seq_printf(p, "%3d: ", i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
for_each_online_cpu(x)
seq_printf(p, "%10u ",
kstat_cpu(cpu_logical_map(x)).irqs[i]);
#endif
seq_printf(p, "%c %s",
(action->flags & IRQF_DISABLED) ? '+' : ' ',
action->name);
action = action->next;
for (;;) {
for (; action; action = action->next) {
seq_printf(p, ",%s %s",
(action->flags & IRQF_DISABLED) ? " +" : "",
action->name);
}
if (!sbusl) break;
k++;
if (k < 4)
action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
else {
j++;
if (j == nsbi) break;
k = 0;
action = sbus_actions [(j << 5) + (sbusl << 2)].action;
}
}
seq_putc(p, '\n');
}
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
return 0;
}
void sun4d_free_irq(unsigned int irq, void *dev_id)
{
struct irqaction *action, **actionp;
struct irqaction *tmp = NULL;
unsigned long flags;
spin_lock_irqsave(&irq_action_lock, flags);
if (irq < 15)
actionp = irq + irq_action;
else
actionp = &(sbus_actions[irq - (1 << 5)].action);
action = *actionp;
if (!action) {
printk("Trying to free free IRQ%d\n",irq);
goto out_unlock;
}
if (dev_id) {
for (; action; action = action->next) {
if (action->dev_id == dev_id)
break;
tmp = action;
}
if (!action) {
printk("Trying to free free shared IRQ%d\n",irq);
goto out_unlock;
}
} else if (action->flags & IRQF_SHARED) {
printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
goto out_unlock;
}
if (action->flags & SA_STATIC_ALLOC)
{
/* This interrupt is marked as specially allocated
* so it is a bad idea to free it.
*/
printk("Attempt to free statically allocated IRQ%d (%s)\n",
irq, action->name);
goto out_unlock;
}
if (action && tmp)
tmp->next = action->next;
else
*actionp = action->next;
spin_unlock_irqrestore(&irq_action_lock, flags);
synchronize_irq(irq);
spin_lock_irqsave(&irq_action_lock, flags);
kfree(action);
if (!(*actionp))
__disable_irq(irq);
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
}
extern void unexpected_irq(int, void *, struct pt_regs *);
void sun4d_handler_irq(int irq, struct pt_regs * regs)
{
struct pt_regs *old_regs;
struct irqaction * action;
int cpu = smp_processor_id();
/* SBUS IRQ level (1 - 7) */
int sbusl = pil_to_sbus[irq];
/* FIXME: Is this necessary?? */
cc_get_ipen();
cc_set_iclr(1 << irq);
old_regs = set_irq_regs(regs);
irq_enter();
kstat_cpu(cpu).irqs[irq]++;
if (!sbusl) {
action = *(irq + irq_action);
if (!action)
unexpected_irq(irq, NULL, regs);
do {
action->handler(irq, action->dev_id);
action = action->next;
} while (action);
} else {
int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
int sbino;
struct sbus_action *actionp;
unsigned mask, slot;
int sbil = (sbusl << 2);
bw_clear_intr_mask(sbusl, bus_mask);
/* Loop for each pending SBI */
for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
if (bus_mask & 1) {
mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
mask &= (0xf << sbil);
actionp = sbus_actions + (sbino << 5) + (sbil);
/* Loop for each pending SBI slot */
for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
if (mask & slot) {
mask &= ~slot;
action = actionp->action;
if (!action)
unexpected_irq(irq, NULL, regs);
do {
action->handler(irq, action->dev_id);
action = action->next;
} while (action);
release_sbi(SBI2DEVID(sbino), slot);
}
}
}
irq_exit();
set_irq_regs(old_regs);
}
unsigned int sun4d_build_irq(struct sbus_dev *sdev, int irq)
{
int sbusl = pil_to_sbus[irq];
if (sbusl)
return ((sdev->bus->board + 1) << 5) + (sbusl << 2) + sdev->slot;
else
return irq;
}
unsigned int sun4d_sbint_to_irq(struct sbus_dev *sdev, unsigned int sbint)
{
if (sbint >= sizeof(sbus_to_pil)) {
printk(KERN_ERR "%s: bogus SBINT %d\n", sdev->prom_name, sbint);
BUG();
}
return sun4d_build_irq(sdev, sbus_to_pil[sbint]);
}
int sun4d_request_irq(unsigned int irq,
irq_handler_t handler,
unsigned long irqflags, const char * devname, void *dev_id)
{
struct irqaction *action, *tmp = NULL, **actionp;
unsigned long flags;
int ret;
if(irq > 14 && irq < (1 << 5)) {
ret = -EINVAL;
goto out;
}
if (!handler) {
ret = -EINVAL;
goto out;
}
spin_lock_irqsave(&irq_action_lock, flags);
if (irq >= (1 << 5))
actionp = &(sbus_actions[irq - (1 << 5)].action);
else
actionp = irq + irq_action;
action = *actionp;
if (action) {
if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
for (tmp = action; tmp->next; tmp = tmp->next);
} else {
ret = -EBUSY;
goto out_unlock;
}
if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
ret = -EBUSY;
goto out_unlock;
}
action = NULL; /* Or else! */
}
/* If this is flagged as statically allocated then we use our
* private struct which is never freed.
*/
if (irqflags & SA_STATIC_ALLOC) {
if (static_irq_count < MAX_STATIC_ALLOC)
action = &static_irqaction[static_irq_count++];
else
printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
}
if (action == NULL)
action = kmalloc(sizeof(struct irqaction),
GFP_ATOMIC);
if (!action) {
ret = -ENOMEM;
goto out_unlock;
}
action->handler = handler;
action->flags = irqflags;
cpus_clear(action->mask);
action->name = devname;
action->next = NULL;
action->dev_id = dev_id;
if (tmp)
tmp->next = action;
else
*actionp = action;
__enable_irq(irq);
ret = 0;
out_unlock:
spin_unlock_irqrestore(&irq_action_lock, flags);
out:
return ret;
}
static void sun4d_disable_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
int tid = sbus_tid[(irq >> 5) - 1];
unsigned long flags;
#endif
if (irq < NR_IRQS) return;
#ifdef CONFIG_SMP
spin_lock_irqsave(&sun4d_imsk_lock, flags);
cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
#else
cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil[(irq >> 2) & 7]));
#endif
}
static void sun4d_enable_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
int tid = sbus_tid[(irq >> 5) - 1];
unsigned long flags;
#endif
if (irq < NR_IRQS) return;
#ifdef CONFIG_SMP
spin_lock_irqsave(&sun4d_imsk_lock, flags);
cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
#else
cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
#endif
}
#ifdef CONFIG_SMP
static void sun4d_set_cpu_int(int cpu, int level)
{
sun4d_send_ipi(cpu, level);
}
static void sun4d_clear_ipi(int cpu, int level)
{
}
static void sun4d_set_udt(int cpu)
{
}
/* Setup IRQ distribution scheme. */
void __init sun4d_distribute_irqs(void)
{
#ifdef DISTRIBUTE_IRQS
struct sbus_bus *sbus;
unsigned long sbus_serving_map;
sbus_serving_map = cpu_present_map;
for_each_sbus(sbus) {
if ((sbus->board * 2) == boot_cpu_id && (cpu_present_map & (1 << (sbus->board * 2 + 1))))
sbus_tid[sbus->board] = (sbus->board * 2 + 1);
else if (cpu_present_map & (1 << (sbus->board * 2)))
sbus_tid[sbus->board] = (sbus->board * 2);
else if (cpu_present_map & (1 << (sbus->board * 2 + 1)))
sbus_tid[sbus->board] = (sbus->board * 2 + 1);
else
sbus_tid[sbus->board] = 0xff;
if (sbus_tid[sbus->board] != 0xff)
sbus_serving_map &= ~(1 << sbus_tid[sbus->board]);
}
for_each_sbus(sbus)
if (sbus_tid[sbus->board] == 0xff) {
int i = 31;
if (!sbus_serving_map)
sbus_serving_map = cpu_present_map;
while (!(sbus_serving_map & (1 << i)))
i--;
sbus_tid[sbus->board] = i;
sbus_serving_map &= ~(1 << i);
}
for_each_sbus(sbus) {
printk("sbus%d IRQs directed to CPU%d\n", sbus->board, sbus_tid[sbus->board]);
set_sbi_tid(sbus->devid, sbus_tid[sbus->board] << 3);
}
#else
struct sbus_bus *sbus;
int cpuid = cpu_logical_map(1);
if (cpuid == -1)
cpuid = cpu_logical_map(0);
for_each_sbus(sbus) {
sbus_tid[sbus->board] = cpuid;
set_sbi_tid(sbus->devid, cpuid << 3);
}
printk("All sbus IRQs directed to CPU%d\n", cpuid);
#endif
}
#endif
static void sun4d_clear_clock_irq(void)
{
volatile unsigned int clear_intr;
clear_intr = sun4d_timers->l10_timer_limit;
}
static void sun4d_clear_profile_irq(int cpu)
{
bw_get_prof_limit(cpu);
}
static void sun4d_load_profile_irq(int cpu, unsigned int limit)
{
bw_set_prof_limit(cpu, limit);
}
static void __init sun4d_init_timers(irq_handler_t counter_fn)
{
int irq;
int cpu;
struct resource r;
int mid;
/* Map the User Timer registers. */
memset(&r, 0, sizeof(r));
#ifdef CONFIG_SMP
r.start = CSR_BASE(boot_cpu_id)+BW_TIMER_LIMIT;
#else
r.start = CSR_BASE(0)+BW_TIMER_LIMIT;
#endif
r.flags = 0xf;
sun4d_timers = (struct sun4d_timer_regs *) sbus_ioremap(&r, 0,
PAGE_SIZE, "user timer");
sun4d_timers->l10_timer_limit = (((1000000/HZ) + 1) << 10);
master_l10_counter = &sun4d_timers->l10_cur_count;
master_l10_limit = &sun4d_timers->l10_timer_limit;
irq = request_irq(TIMER_IRQ,
counter_fn,
(IRQF_DISABLED | SA_STATIC_ALLOC),
"timer", NULL);
if (irq) {
prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ);
prom_halt();
}
/* Enable user timer free run for CPU 0 in BW */
/* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
cpu = 0;
while (!cpu_find_by_instance(cpu, NULL, &mid)) {
sun4d_load_profile_irq(mid >> 3, 0);
cpu++;
}
#ifdef CONFIG_SMP
{
unsigned long flags;
extern unsigned long lvl14_save[4];
struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
extern unsigned int real_irq_entry[], smp4d_ticker[];
extern unsigned int patchme_maybe_smp_msg[];
/* Adjust so that we jump directly to smp4d_ticker */
lvl14_save[2] += smp4d_ticker - real_irq_entry;
/* For SMP we use the level 14 ticker, however the bootup code
* has copied the firmware's level 14 vector into the boot cpu's
* trap table, we must fix this now or we get squashed.
*/
local_irq_save(flags);
patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
trap_table->inst_one = lvl14_save[0];
trap_table->inst_two = lvl14_save[1];
trap_table->inst_three = lvl14_save[2];
trap_table->inst_four = lvl14_save[3];
local_flush_cache_all();
local_irq_restore(flags);
}
#endif
}
void __init sun4d_init_sbi_irq(void)
{
struct sbus_bus *sbus;
unsigned mask;
nsbi = 0;
for_each_sbus(sbus)
nsbi++;
sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
if (!sbus_actions) {
prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
prom_halt();
}
for_each_sbus(sbus) {
#ifdef CONFIG_SMP
extern unsigned char boot_cpu_id;
set_sbi_tid(sbus->devid, boot_cpu_id << 3);
sbus_tid[sbus->board] = boot_cpu_id;
#endif
/* Get rid of pending irqs from PROM */
mask = acquire_sbi(sbus->devid, 0xffffffff);
if (mask) {
printk ("Clearing pending IRQs %08x on SBI %d\n", mask, sbus->board);
release_sbi(sbus->devid, mask);
}
}
}
void __init sun4d_init_IRQ(void)
{
local_irq_disable();
BTFIXUPSET_CALL(sbint_to_irq, sun4d_sbint_to_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_profile_irq, sun4d_clear_profile_irq, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
sparc_init_timers = sun4d_init_timers;
#ifdef CONFIG_SMP
BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
#endif
/* Cannot enable interrupts until OBP ticker is disabled. */
}
