Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 594 insertions, 0 deletions

diff --git a/arch/sparc/kernel/sun4d_irq.c b/arch/sparc/kernel/sun4d_irq.c
new file mode 100644
index 000000000000..52621348a56c
--- /dev/null
+++ b/arch/sparc/kernel/sun4d_irq.c
@@ -0,0 +1,594 @@
+/*  $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/config.h>
+#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/smp_lock.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>
+
+/* 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
+
+extern struct irqaction *irq_action[];
+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 (x = 0; x < NR_CPUS; x++) {
+                        if (cpu_online(x))
+                                seq_printf(p, "%10u ",
+                                       kstat_cpu(cpu_logical_map(x)).irqs[i]);
+                }
+#endif
+                seq_printf(p, "%c %s",
+                        (action->flags & SA_INTERRUPT) ? '+' : ' ',
+                        action->name);
+                action = action->next;
+                for (;;) {
+                        for (; action; action = action->next) {
+                                seq_printf(p, ",%s %s",
+                                        (action->flags & SA_INTERRUPT) ? " +" : "",
+                                        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 & SA_SHIRQ) {
+                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 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);
+        
+        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, regs);
+                        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, regs);
+                                                        action = action->next;
+                                                } while (action);
+                                                release_sbi(SBI2DEVID(sbino), slot);
+                                        }
+                        }
+        }
+        irq_exit();
+}
+
+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,
+                irqreturn_t (*handler)(int, void *, struct pt_regs *),
+                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 & SA_SHIRQ) && (irqflags & SA_SHIRQ)) {
+                        for (tmp = action; tmp->next; tmp = tmp->next);
+                } else {
+                        ret = -EBUSY;
+                        goto out_unlock;
+                }
+                if ((action->flags & SA_INTERRUPT) ^ (irqflags & SA_INTERRUPT)) {
+                        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 = (struct irqaction *)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(irqreturn_t (*counter_fn)(int, void *, struct pt_regs *))
+{
+        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,
+                          (SA_INTERRUPT | 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 firmwares level 14 vector into 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 = (struct sbus_action *)kmalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
+        memset (sbus_actions, 0, (nsbi * 8 * 4 * sizeof(struct sbus_action)));
+        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);
+                }
+        }
+}
+
+static char *sun4d_irq_itoa(unsigned int irq)
+{
+        static char buff[16];
+        
+        if (irq < (1 << 5))
+                sprintf(buff, "%d", irq);
+        else
+                sprintf(buff, "%d,%x", sbus_to_pil[(irq >> 2) & 7], irq);
+        return buff;
+}
+
+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);
+        BTFIXUPSET_CALL(__irq_itoa, sun4d_irq_itoa, 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. */
+}