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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sparc/kernel/sun4d_irq.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
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!
Diffstat (limited to 'arch/sparc/kernel/sun4d_irq.c')
-rw-r--r-- | arch/sparc/kernel/sun4d_irq.c | 594 |
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. */ +} |