Make do_execve() take a const filename pointer
[linux-3.10.git] / arch / sparc / kernel / sun4d_irq.c
1 /*
2  *  arch/sparc/kernel/sun4d_irq.c:
3  *                      SS1000/SC2000 interrupt handling.
4  *
5  *  Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  *  Heavily based on arch/sparc/kernel/irq.c.
7  */
8
9 #include <linux/errno.h>
10 #include <linux/linkage.h>
11 #include <linux/kernel_stat.h>
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/ptrace.h>
15 #include <linux/interrupt.h>
16 #include <linux/slab.h>
17 #include <linux/random.h>
18 #include <linux/init.h>
19 #include <linux/smp.h>
20 #include <linux/spinlock.h>
21 #include <linux/seq_file.h>
22 #include <linux/of.h>
23 #include <linux/of_device.h>
24
25 #include <asm/ptrace.h>
26 #include <asm/processor.h>
27 #include <asm/system.h>
28 #include <asm/psr.h>
29 #include <asm/smp.h>
30 #include <asm/vaddrs.h>
31 #include <asm/timer.h>
32 #include <asm/openprom.h>
33 #include <asm/oplib.h>
34 #include <asm/traps.h>
35 #include <asm/irq.h>
36 #include <asm/io.h>
37 #include <asm/pgalloc.h>
38 #include <asm/pgtable.h>
39 #include <asm/sbi.h>
40 #include <asm/cacheflush.h>
41 #include <asm/irq_regs.h>
42
43 #include "kernel.h"
44 #include "irq.h"
45
46 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
47 /* #define DISTRIBUTE_IRQS */
48
49 struct sun4d_timer_regs {
50         u32     l10_timer_limit;
51         u32     l10_cur_countx;
52         u32     l10_limit_noclear;
53         u32     ctrl;
54         u32     l10_cur_count;
55 };
56
57 static struct sun4d_timer_regs __iomem *sun4d_timers;
58
59 #define TIMER_IRQ       10
60
61 #define MAX_STATIC_ALLOC        4
62 extern int static_irq_count;
63 static unsigned char sbus_tid[32];
64
65 static struct irqaction *irq_action[NR_IRQS];
66 extern spinlock_t irq_action_lock;
67
68 static struct sbus_action {
69         struct irqaction *action;
70         /* For SMP this needs to be extended */
71 } *sbus_actions;
72
73 static int pil_to_sbus[] = {
74         0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
75 };
76
77 static int sbus_to_pil[] = {
78         0, 2, 3, 5, 7, 9, 11, 13,
79 };
80
81 static int nsbi;
82
83 /* Exported for sun4d_smp.c */
84 DEFINE_SPINLOCK(sun4d_imsk_lock);
85
86 int show_sun4d_interrupts(struct seq_file *p, void *v)
87 {
88         int i = *(loff_t *) v, j = 0, k = 0, sbusl;
89         struct irqaction * action;
90         unsigned long flags;
91 #ifdef CONFIG_SMP
92         int x;
93 #endif
94
95         spin_lock_irqsave(&irq_action_lock, flags);
96         if (i < NR_IRQS) {
97                 sbusl = pil_to_sbus[i];
98                 if (!sbusl) {
99                         action = *(i + irq_action);
100                         if (!action) 
101                                 goto out_unlock;
102                 } else {
103                         for (j = 0; j < nsbi; j++) {
104                                 for (k = 0; k < 4; k++)
105                                         if ((action = sbus_actions [(j << 5) + (sbusl << 2) + k].action))
106                                                 goto found_it;
107                         }
108                         goto out_unlock;
109                 }
110 found_it:       seq_printf(p, "%3d: ", i);
111 #ifndef CONFIG_SMP
112                 seq_printf(p, "%10u ", kstat_irqs(i));
113 #else
114                 for_each_online_cpu(x)
115                         seq_printf(p, "%10u ",
116                                kstat_cpu(cpu_logical_map(x)).irqs[i]);
117 #endif
118                 seq_printf(p, "%c %s",
119                         (action->flags & IRQF_DISABLED) ? '+' : ' ',
120                         action->name);
121                 action = action->next;
122                 for (;;) {
123                         for (; action; action = action->next) {
124                                 seq_printf(p, ",%s %s",
125                                         (action->flags & IRQF_DISABLED) ? " +" : "",
126                                         action->name);
127                         }
128                         if (!sbusl) break;
129                         k++;
130                         if (k < 4)
131                                 action = sbus_actions [(j << 5) + (sbusl << 2) + k].action;
132                         else {
133                                 j++;
134                                 if (j == nsbi) break;
135                                 k = 0;
136                                 action = sbus_actions [(j << 5) + (sbusl << 2)].action;
137                         }
138                 }
139                 seq_putc(p, '\n');
140         }
141 out_unlock:
142         spin_unlock_irqrestore(&irq_action_lock, flags);
143         return 0;
144 }
145
146 void sun4d_free_irq(unsigned int irq, void *dev_id)
147 {
148         struct irqaction *action, **actionp;
149         struct irqaction *tmp = NULL;
150         unsigned long flags;
151
152         spin_lock_irqsave(&irq_action_lock, flags);
153         if (irq < 15)
154                 actionp = irq + irq_action;
155         else
156                 actionp = &(sbus_actions[irq - (1 << 5)].action);
157         action = *actionp;
158         if (!action) {
159                 printk("Trying to free free IRQ%d\n",irq);
160                 goto out_unlock;
161         }
162         if (dev_id) {
163                 for (; action; action = action->next) {
164                         if (action->dev_id == dev_id)
165                                 break;
166                         tmp = action;
167                 }
168                 if (!action) {
169                         printk("Trying to free free shared IRQ%d\n",irq);
170                         goto out_unlock;
171                 }
172         } else if (action->flags & IRQF_SHARED) {
173                 printk("Trying to free shared IRQ%d with NULL device ID\n", irq);
174                 goto out_unlock;
175         }
176         if (action->flags & SA_STATIC_ALLOC)
177         {
178                 /* This interrupt is marked as specially allocated
179                  * so it is a bad idea to free it.
180                  */
181                 printk("Attempt to free statically allocated IRQ%d (%s)\n",
182                        irq, action->name);
183                 goto out_unlock;
184         }
185         
186         if (tmp)
187                 tmp->next = action->next;
188         else
189                 *actionp = action->next;
190
191         spin_unlock_irqrestore(&irq_action_lock, flags);
192
193         synchronize_irq(irq);
194
195         spin_lock_irqsave(&irq_action_lock, flags);
196
197         kfree(action);
198
199         if (!(*actionp))
200                 __disable_irq(irq);
201
202 out_unlock:
203         spin_unlock_irqrestore(&irq_action_lock, flags);
204 }
205
206 extern void unexpected_irq(int, void *, struct pt_regs *);
207
208 void sun4d_handler_irq(int irq, struct pt_regs * regs)
209 {
210         struct pt_regs *old_regs;
211         struct irqaction * action;
212         int cpu = smp_processor_id();
213         /* SBUS IRQ level (1 - 7) */
214         int sbusl = pil_to_sbus[irq];
215         
216         /* FIXME: Is this necessary?? */
217         cc_get_ipen();
218         
219         cc_set_iclr(1 << irq);
220         
221         old_regs = set_irq_regs(regs);
222         irq_enter();
223         kstat_cpu(cpu).irqs[irq]++;
224         if (!sbusl) {
225                 action = *(irq + irq_action);
226                 if (!action)
227                         unexpected_irq(irq, NULL, regs);
228                 do {
229                         action->handler(irq, action->dev_id);
230                         action = action->next;
231                 } while (action);
232         } else {
233                 int bus_mask = bw_get_intr_mask(sbusl) & 0x3ffff;
234                 int sbino;
235                 struct sbus_action *actionp;
236                 unsigned mask, slot;
237                 int sbil = (sbusl << 2);
238                 
239                 bw_clear_intr_mask(sbusl, bus_mask);
240                 
241                 /* Loop for each pending SBI */
242                 for (sbino = 0; bus_mask; sbino++, bus_mask >>= 1)
243                         if (bus_mask & 1) {
244                                 mask = acquire_sbi(SBI2DEVID(sbino), 0xf << sbil);
245                                 mask &= (0xf << sbil);
246                                 actionp = sbus_actions + (sbino << 5) + (sbil);
247                                 /* Loop for each pending SBI slot */
248                                 for (slot = (1 << sbil); mask; slot <<= 1, actionp++)
249                                         if (mask & slot) {
250                                                 mask &= ~slot;
251                                                 action = actionp->action;
252                                                 
253                                                 if (!action)
254                                                         unexpected_irq(irq, NULL, regs);
255                                                 do {
256                                                         action->handler(irq, action->dev_id);
257                                                         action = action->next;
258                                                 } while (action);
259                                                 release_sbi(SBI2DEVID(sbino), slot);
260                                         }
261                         }
262         }
263         irq_exit();
264         set_irq_regs(old_regs);
265 }
266
267 int sun4d_request_irq(unsigned int irq,
268                 irq_handler_t handler,
269                 unsigned long irqflags, const char * devname, void *dev_id)
270 {
271         struct irqaction *action, *tmp = NULL, **actionp;
272         unsigned long flags;
273         int ret;
274         
275         if(irq > 14 && irq < (1 << 5)) {
276                 ret = -EINVAL;
277                 goto out;
278         }
279
280         if (!handler) {
281                 ret = -EINVAL;
282                 goto out;
283         }
284
285         spin_lock_irqsave(&irq_action_lock, flags);
286
287         if (irq >= (1 << 5))
288                 actionp = &(sbus_actions[irq - (1 << 5)].action);
289         else
290                 actionp = irq + irq_action;
291         action = *actionp;
292         
293         if (action) {
294                 if ((action->flags & IRQF_SHARED) && (irqflags & IRQF_SHARED)) {
295                         for (tmp = action; tmp->next; tmp = tmp->next);
296                 } else {
297                         ret = -EBUSY;
298                         goto out_unlock;
299                 }
300                 if ((action->flags & IRQF_DISABLED) ^ (irqflags & IRQF_DISABLED)) {
301                         printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq);
302                         ret = -EBUSY;
303                         goto out_unlock;
304                 }
305                 action = NULL;          /* Or else! */
306         }
307
308         /* If this is flagged as statically allocated then we use our
309          * private struct which is never freed.
310          */
311         if (irqflags & SA_STATIC_ALLOC) {
312                 if (static_irq_count < MAX_STATIC_ALLOC)
313                         action = &static_irqaction[static_irq_count++];
314                 else
315                         printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq, devname);
316         }
317         
318         if (action == NULL)
319                 action = kmalloc(sizeof(struct irqaction),
320                                                      GFP_ATOMIC);
321         
322         if (!action) { 
323                 ret = -ENOMEM;
324                 goto out_unlock;
325         }
326
327         action->handler = handler;
328         action->flags = irqflags;
329         action->name = devname;
330         action->next = NULL;
331         action->dev_id = dev_id;
332
333         if (tmp)
334                 tmp->next = action;
335         else
336                 *actionp = action;
337                 
338         __enable_irq(irq);
339
340         ret = 0;
341 out_unlock:
342         spin_unlock_irqrestore(&irq_action_lock, flags);
343 out:
344         return ret;
345 }
346
347 static void sun4d_disable_irq(unsigned int irq)
348 {
349         int tid = sbus_tid[(irq >> 5) - 1];
350         unsigned long flags;
351         
352         if (irq < NR_IRQS)
353                 return;
354
355         spin_lock_irqsave(&sun4d_imsk_lock, flags);
356         cc_set_imsk_other(tid, cc_get_imsk_other(tid) | (1 << sbus_to_pil[(irq >> 2) & 7]));
357         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
358 }
359
360 static void sun4d_enable_irq(unsigned int irq)
361 {
362         int tid = sbus_tid[(irq >> 5) - 1];
363         unsigned long flags;
364         
365         if (irq < NR_IRQS)
366                 return;
367
368         spin_lock_irqsave(&sun4d_imsk_lock, flags);
369         cc_set_imsk_other(tid, cc_get_imsk_other(tid) & ~(1 << sbus_to_pil[(irq >> 2) & 7]));
370         spin_unlock_irqrestore(&sun4d_imsk_lock, flags);
371 }
372
373 #ifdef CONFIG_SMP
374 static void sun4d_set_cpu_int(int cpu, int level)
375 {
376         sun4d_send_ipi(cpu, level);
377 }
378
379 static void sun4d_clear_ipi(int cpu, int level)
380 {
381 }
382
383 static void sun4d_set_udt(int cpu)
384 {
385 }
386
387 /* Setup IRQ distribution scheme. */
388 void __init sun4d_distribute_irqs(void)
389 {
390         struct device_node *dp;
391
392 #ifdef DISTRIBUTE_IRQS
393         cpumask_t sbus_serving_map;
394
395         sbus_serving_map = cpu_present_map;
396         for_each_node_by_name(dp, "sbi") {
397                 int board = of_getintprop_default(dp, "board#", 0);
398
399                 if ((board * 2) == boot_cpu_id && cpu_isset(board * 2 + 1, cpu_present_map))
400                         sbus_tid[board] = (board * 2 + 1);
401                 else if (cpu_isset(board * 2, cpu_present_map))
402                         sbus_tid[board] = (board * 2);
403                 else if (cpu_isset(board * 2 + 1, cpu_present_map))
404                         sbus_tid[board] = (board * 2 + 1);
405                 else
406                         sbus_tid[board] = 0xff;
407                 if (sbus_tid[board] != 0xff)
408                         cpu_clear(sbus_tid[board], sbus_serving_map);
409         }
410         for_each_node_by_name(dp, "sbi") {
411                 int board = of_getintprop_default(dp, "board#", 0);
412                 if (sbus_tid[board] == 0xff) {
413                         int i = 31;
414                                 
415                         if (cpus_empty(sbus_serving_map))
416                                 sbus_serving_map = cpu_present_map;
417                         while (cpu_isset(i, sbus_serving_map))
418                                 i--;
419                         sbus_tid[board] = i;
420                         cpu_clear(i, sbus_serving_map);
421                 }
422         }
423         for_each_node_by_name(dp, "sbi") {
424                 int devid = of_getintprop_default(dp, "device-id", 0);
425                 int board = of_getintprop_default(dp, "board#", 0);
426                 printk("sbus%d IRQs directed to CPU%d\n", board, sbus_tid[board]);
427                 set_sbi_tid(devid, sbus_tid[board] << 3);
428         }
429 #else
430         int cpuid = cpu_logical_map(1);
431
432         if (cpuid == -1)
433                 cpuid = cpu_logical_map(0);
434         for_each_node_by_name(dp, "sbi") {
435                 int devid = of_getintprop_default(dp, "device-id", 0);
436                 int board = of_getintprop_default(dp, "board#", 0);
437                 sbus_tid[board] = cpuid;
438                 set_sbi_tid(devid, cpuid << 3);
439         }
440         printk("All sbus IRQs directed to CPU%d\n", cpuid);
441 #endif
442 }
443 #endif
444  
445 static void sun4d_clear_clock_irq(void)
446 {
447         sbus_readl(&sun4d_timers->l10_timer_limit);
448 }
449
450 static void sun4d_load_profile_irq(int cpu, unsigned int limit)
451 {
452         bw_set_prof_limit(cpu, limit);
453 }
454
455 static void __init sun4d_load_profile_irqs(void)
456 {
457         int cpu = 0, mid;
458
459         while (!cpu_find_by_instance(cpu, NULL, &mid)) {
460                 sun4d_load_profile_irq(mid >> 3, 0);
461                 cpu++;
462         }
463 }
464
465 static void __init sun4d_fixup_trap_table(void)
466 {
467 #ifdef CONFIG_SMP
468         unsigned long flags;
469         extern unsigned long lvl14_save[4];
470         struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (14 - 1)];
471         extern unsigned int real_irq_entry[], smp4d_ticker[];
472         extern unsigned int patchme_maybe_smp_msg[];
473
474         /* Adjust so that we jump directly to smp4d_ticker */
475         lvl14_save[2] += smp4d_ticker - real_irq_entry;
476
477         /* For SMP we use the level 14 ticker, however the bootup code
478          * has copied the firmware's level 14 vector into the boot cpu's
479          * trap table, we must fix this now or we get squashed.
480          */
481         local_irq_save(flags);
482         patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
483         trap_table->inst_one = lvl14_save[0];
484         trap_table->inst_two = lvl14_save[1];
485         trap_table->inst_three = lvl14_save[2];
486         trap_table->inst_four = lvl14_save[3];
487         local_flush_cache_all();
488         local_irq_restore(flags);
489 #endif
490 }
491
492 static void __init sun4d_init_timers(irq_handler_t counter_fn)
493 {
494         struct device_node *dp;
495         struct resource res;
496         const u32 *reg;
497         int err;
498
499         dp = of_find_node_by_name(NULL, "cpu-unit");
500         if (!dp) {
501                 prom_printf("sun4d_init_timers: Unable to find cpu-unit\n");
502                 prom_halt();
503         }
504
505         /* Which cpu-unit we use is arbitrary, we can view the bootbus timer
506          * registers via any cpu's mapping.  The first 'reg' property is the
507          * bootbus.
508          */
509         reg = of_get_property(dp, "reg", NULL);
510         of_node_put(dp);
511         if (!reg) {
512                 prom_printf("sun4d_init_timers: No reg property\n");
513                 prom_halt();
514         }
515
516         res.start = reg[1];
517         res.end = reg[2] - 1;
518         res.flags = reg[0] & 0xff;
519         sun4d_timers = of_ioremap(&res, BW_TIMER_LIMIT,
520                                   sizeof(struct sun4d_timer_regs), "user timer");
521         if (!sun4d_timers) {
522                 prom_printf("sun4d_init_timers: Can't map timer regs\n");
523                 prom_halt();
524         }
525
526         sbus_writel((((1000000/HZ) + 1) << 10), &sun4d_timers->l10_timer_limit);
527
528         master_l10_counter = &sun4d_timers->l10_cur_count;
529
530         err = request_irq(TIMER_IRQ, counter_fn,
531                           (IRQF_DISABLED | SA_STATIC_ALLOC),
532                           "timer", NULL);
533         if (err) {
534                 prom_printf("sun4d_init_timers: request_irq() failed with %d\n", err);
535                 prom_halt();
536         }
537         sun4d_load_profile_irqs();
538         sun4d_fixup_trap_table();
539 }
540
541 void __init sun4d_init_sbi_irq(void)
542 {
543         struct device_node *dp;
544         int target_cpu = 0;
545
546 #ifdef CONFIG_SMP
547         target_cpu = boot_cpu_id;
548 #endif
549
550         nsbi = 0;
551         for_each_node_by_name(dp, "sbi")
552                 nsbi++;
553         sbus_actions = kzalloc (nsbi * 8 * 4 * sizeof(struct sbus_action), GFP_ATOMIC);
554         if (!sbus_actions) {
555                 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
556                 prom_halt();
557         }
558         for_each_node_by_name(dp, "sbi") {
559                 int devid = of_getintprop_default(dp, "device-id", 0);
560                 int board = of_getintprop_default(dp, "board#", 0);
561                 unsigned int mask;
562
563                 set_sbi_tid(devid, target_cpu << 3);
564                 sbus_tid[board] = target_cpu;
565
566                 /* Get rid of pending irqs from PROM */
567                 mask = acquire_sbi(devid, 0xffffffff);
568                 if (mask) {
569                         printk ("Clearing pending IRQs %08x on SBI %d\n", mask, board);
570                         release_sbi(devid, mask);
571                 }
572         }
573 }
574
575 void __init sun4d_init_IRQ(void)
576 {
577         local_irq_disable();
578
579         BTFIXUPSET_CALL(enable_irq, sun4d_enable_irq, BTFIXUPCALL_NORM);
580         BTFIXUPSET_CALL(disable_irq, sun4d_disable_irq, BTFIXUPCALL_NORM);
581         BTFIXUPSET_CALL(clear_clock_irq, sun4d_clear_clock_irq, BTFIXUPCALL_NORM);
582         BTFIXUPSET_CALL(load_profile_irq, sun4d_load_profile_irq, BTFIXUPCALL_NORM);
583         sparc_init_timers = sun4d_init_timers;
584 #ifdef CONFIG_SMP
585         BTFIXUPSET_CALL(set_cpu_int, sun4d_set_cpu_int, BTFIXUPCALL_NORM);
586         BTFIXUPSET_CALL(clear_cpu_int, sun4d_clear_ipi, BTFIXUPCALL_NOP);
587         BTFIXUPSET_CALL(set_irq_udt, sun4d_set_udt, BTFIXUPCALL_NOP);
588 #endif
589         /* Cannot enable interrupts until OBP ticker is disabled. */
590 }