Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*  $Id: sun4d_irq.c,v 1.29 2001/12/11 04:55:51 davem Exp $

 *  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. */

}