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sun4d_irq.c

/*
 *  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
static unsigned char sbus_tid[32];
#endif

static struct irqaction *irq_action[NR_IRQS];
extern spinlock_t irq_action_lock;

static 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;
}

static 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. */
}

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