2 * arch/sparc/kernel/sun4d_irq.c:
3 * SS1000/SC2000 interrupt handling.
5 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6 * Heavily based on arch/sparc/kernel/irq.c.
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>
23 #include <linux/of_device.h>
25 #include <asm/ptrace.h>
26 #include <asm/processor.h>
27 #include <asm/system.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>
37 #include <asm/pgalloc.h>
38 #include <asm/pgtable.h>
40 #include <asm/cacheflush.h>
41 #include <asm/irq_regs.h>
45 /* If you trust current SCSI layer to handle different SCSI IRQs, enable this. I don't trust it... -jj */
46 /* #define DISTRIBUTE_IRQS */
48 struct sun4d_timer_regs
*sun4d_timers
;
51 #define MAX_STATIC_ALLOC 4
52 extern struct irqaction static_irqaction
[MAX_STATIC_ALLOC
];
53 extern int static_irq_count
;
55 static unsigned char sbus_tid
[32];
58 static struct irqaction
*irq_action
[NR_IRQS
];
59 extern spinlock_t irq_action_lock
;
61 static struct sbus_action
{
62 struct irqaction
*action
;
63 /* For SMP this needs to be extended */
66 static int pil_to_sbus
[] = {
67 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
70 static int sbus_to_pil
[] = {
71 0, 2, 3, 5, 7, 9, 11, 13,
76 DEFINE_SPINLOCK(sun4d_imsk_lock
);
79 int show_sun4d_interrupts(struct seq_file
*p
, void *v
)
81 int i
= *(loff_t
*) v
, j
= 0, k
= 0, sbusl
;
82 struct irqaction
* action
;
88 spin_lock_irqsave(&irq_action_lock
, flags
);
90 sbusl
= pil_to_sbus
[i
];
92 action
= *(i
+ irq_action
);
96 for (j
= 0; j
< nsbi
; j
++) {
97 for (k
= 0; k
< 4; k
++)
98 if ((action
= sbus_actions
[(j
<< 5) + (sbusl
<< 2) + k
].action
))
103 found_it
: seq_printf(p
, "%3d: ", i
);
105 seq_printf(p
, "%10u ", kstat_irqs(i
));
107 for_each_online_cpu(x
)
108 seq_printf(p
, "%10u ",
109 kstat_cpu(cpu_logical_map(x
)).irqs
[i
]);
111 seq_printf(p
, "%c %s",
112 (action
->flags
& IRQF_DISABLED
) ? '+' : ' ',
114 action
= action
->next
;
116 for (; action
; action
= action
->next
) {
117 seq_printf(p
, ",%s %s",
118 (action
->flags
& IRQF_DISABLED
) ? " +" : "",
124 action
= sbus_actions
[(j
<< 5) + (sbusl
<< 2) + k
].action
;
127 if (j
== nsbi
) break;
129 action
= sbus_actions
[(j
<< 5) + (sbusl
<< 2)].action
;
135 spin_unlock_irqrestore(&irq_action_lock
, flags
);
139 void sun4d_free_irq(unsigned int irq
, void *dev_id
)
141 struct irqaction
*action
, **actionp
;
142 struct irqaction
*tmp
= NULL
;
145 spin_lock_irqsave(&irq_action_lock
, flags
);
147 actionp
= irq
+ irq_action
;
149 actionp
= &(sbus_actions
[irq
- (1 << 5)].action
);
152 printk("Trying to free free IRQ%d\n",irq
);
156 for (; action
; action
= action
->next
) {
157 if (action
->dev_id
== dev_id
)
162 printk("Trying to free free shared IRQ%d\n",irq
);
165 } else if (action
->flags
& IRQF_SHARED
) {
166 printk("Trying to free shared IRQ%d with NULL device ID\n", irq
);
169 if (action
->flags
& SA_STATIC_ALLOC
)
171 /* This interrupt is marked as specially allocated
172 * so it is a bad idea to free it.
174 printk("Attempt to free statically allocated IRQ%d (%s)\n",
180 tmp
->next
= action
->next
;
182 *actionp
= action
->next
;
184 spin_unlock_irqrestore(&irq_action_lock
, flags
);
186 synchronize_irq(irq
);
188 spin_lock_irqsave(&irq_action_lock
, flags
);
196 spin_unlock_irqrestore(&irq_action_lock
, flags
);
199 extern void unexpected_irq(int, void *, struct pt_regs
*);
201 void sun4d_handler_irq(int irq
, struct pt_regs
* regs
)
203 struct pt_regs
*old_regs
;
204 struct irqaction
* action
;
205 int cpu
= smp_processor_id();
206 /* SBUS IRQ level (1 - 7) */
207 int sbusl
= pil_to_sbus
[irq
];
209 /* FIXME: Is this necessary?? */
212 cc_set_iclr(1 << irq
);
214 old_regs
= set_irq_regs(regs
);
216 kstat_cpu(cpu
).irqs
[irq
]++;
218 action
= *(irq
+ irq_action
);
220 unexpected_irq(irq
, NULL
, regs
);
222 action
->handler(irq
, action
->dev_id
);
223 action
= action
->next
;
226 int bus_mask
= bw_get_intr_mask(sbusl
) & 0x3ffff;
228 struct sbus_action
*actionp
;
230 int sbil
= (sbusl
<< 2);
232 bw_clear_intr_mask(sbusl
, bus_mask
);
234 /* Loop for each pending SBI */
235 for (sbino
= 0; bus_mask
; sbino
++, bus_mask
>>= 1)
237 mask
= acquire_sbi(SBI2DEVID(sbino
), 0xf << sbil
);
238 mask
&= (0xf << sbil
);
239 actionp
= sbus_actions
+ (sbino
<< 5) + (sbil
);
240 /* Loop for each pending SBI slot */
241 for (slot
= (1 << sbil
); mask
; slot
<<= 1, actionp
++)
244 action
= actionp
->action
;
247 unexpected_irq(irq
, NULL
, regs
);
249 action
->handler(irq
, action
->dev_id
);
250 action
= action
->next
;
252 release_sbi(SBI2DEVID(sbino
), slot
);
257 set_irq_regs(old_regs
);
260 int sun4d_request_irq(unsigned int irq
,
261 irq_handler_t handler
,
262 unsigned long irqflags
, const char * devname
, void *dev_id
)
264 struct irqaction
*action
, *tmp
= NULL
, **actionp
;
268 if(irq
> 14 && irq
< (1 << 5)) {
278 spin_lock_irqsave(&irq_action_lock
, flags
);
281 actionp
= &(sbus_actions
[irq
- (1 << 5)].action
);
283 actionp
= irq
+ irq_action
;
287 if ((action
->flags
& IRQF_SHARED
) && (irqflags
& IRQF_SHARED
)) {
288 for (tmp
= action
; tmp
->next
; tmp
= tmp
->next
);
293 if ((action
->flags
& IRQF_DISABLED
) ^ (irqflags
& IRQF_DISABLED
)) {
294 printk("Attempt to mix fast and slow interrupts on IRQ%d denied\n", irq
);
298 action
= NULL
; /* Or else! */
301 /* If this is flagged as statically allocated then we use our
302 * private struct which is never freed.
304 if (irqflags
& SA_STATIC_ALLOC
) {
305 if (static_irq_count
< MAX_STATIC_ALLOC
)
306 action
= &static_irqaction
[static_irq_count
++];
308 printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed using kmalloc\n", irq
, devname
);
312 action
= kmalloc(sizeof(struct irqaction
),
320 action
->handler
= handler
;
321 action
->flags
= irqflags
;
322 cpus_clear(action
->mask
);
323 action
->name
= devname
;
325 action
->dev_id
= dev_id
;
336 spin_unlock_irqrestore(&irq_action_lock
, flags
);
341 static void sun4d_disable_irq(unsigned int irq
)
344 int tid
= sbus_tid
[(irq
>> 5) - 1];
348 if (irq
< NR_IRQS
) return;
350 spin_lock_irqsave(&sun4d_imsk_lock
, flags
);
351 cc_set_imsk_other(tid
, cc_get_imsk_other(tid
) | (1 << sbus_to_pil
[(irq
>> 2) & 7]));
352 spin_unlock_irqrestore(&sun4d_imsk_lock
, flags
);
354 cc_set_imsk(cc_get_imsk() | (1 << sbus_to_pil
[(irq
>> 2) & 7]));
358 static void sun4d_enable_irq(unsigned int irq
)
361 int tid
= sbus_tid
[(irq
>> 5) - 1];
365 if (irq
< NR_IRQS
) return;
367 spin_lock_irqsave(&sun4d_imsk_lock
, flags
);
368 cc_set_imsk_other(tid
, cc_get_imsk_other(tid
) & ~(1 << sbus_to_pil
[(irq
>> 2) & 7]));
369 spin_unlock_irqrestore(&sun4d_imsk_lock
, flags
);
371 cc_set_imsk(cc_get_imsk() & ~(1 << sbus_to_pil
[(irq
>> 2) & 7]));
376 static void sun4d_set_cpu_int(int cpu
, int level
)
378 sun4d_send_ipi(cpu
, level
);
381 static void sun4d_clear_ipi(int cpu
, int level
)
385 static void sun4d_set_udt(int cpu
)
389 /* Setup IRQ distribution scheme. */
390 void __init
sun4d_distribute_irqs(void)
392 struct device_node
*dp
;
394 #ifdef DISTRIBUTE_IRQS
395 cpumask_t sbus_serving_map
;
397 sbus_serving_map
= cpu_present_map
;
398 for_each_node_by_name(dp
, "sbi") {
399 int board
= of_getintprop_default(dp
, "board#", 0);
401 if ((board
* 2) == boot_cpu_id
&& cpu_isset(board
* 2 + 1, cpu_present_map
))
402 sbus_tid
[board
] = (board
* 2 + 1);
403 else if (cpu_isset(board
* 2, cpu_present_map
))
404 sbus_tid
[board
] = (board
* 2);
405 else if (cpu_isset(board
* 2 + 1, cpu_present_map
))
406 sbus_tid
[board
] = (board
* 2 + 1);
408 sbus_tid
[board
] = 0xff;
409 if (sbus_tid
[board
] != 0xff)
410 cpu_clear(sbus_tid
[board
], sbus_serving_map
);
412 for_each_node_by_name(dp
, "sbi") {
413 int board
= of_getintprop_default(dp
, "board#", 0);
414 if (sbus_tid
[board
] == 0xff) {
417 if (cpus_empty(sbus_serving_map
))
418 sbus_serving_map
= cpu_present_map
;
419 while (cpu_isset(i
, sbus_serving_map
))
422 cpu_clear(i
, sbus_serving_map
);
425 for_each_node_by_name(dp
, "sbi") {
426 int devid
= of_getintprop_default(dp
, "device-id", 0);
427 int board
= of_getintprop_default(dp
, "board#", 0);
428 printk("sbus%d IRQs directed to CPU%d\n", board
, sbus_tid
[board
]);
429 set_sbi_tid(devid
, sbus_tid
[board
] << 3);
432 int cpuid
= cpu_logical_map(1);
435 cpuid
= cpu_logical_map(0);
436 for_each_node_by_name(dp
, "sbi") {
437 int devid
= of_getintprop_default(dp
, "device-id", 0);
438 int board
= of_getintprop_default(dp
, "board#", 0);
439 sbus_tid
[board
] = cpuid
;
440 set_sbi_tid(devid
, cpuid
<< 3);
442 printk("All sbus IRQs directed to CPU%d\n", cpuid
);
447 static void sun4d_clear_clock_irq(void)
449 volatile unsigned int clear_intr
;
450 clear_intr
= sun4d_timers
->l10_timer_limit
;
453 static void sun4d_clear_profile_irq(int cpu
)
455 bw_get_prof_limit(cpu
);
458 static void sun4d_load_profile_irq(int cpu
, unsigned int limit
)
460 bw_set_prof_limit(cpu
, limit
);
463 static void __init
sun4d_init_timers(irq_handler_t counter_fn
)
470 /* Map the User Timer registers. */
471 memset(&r
, 0, sizeof(r
));
473 r
.start
= CSR_BASE(boot_cpu_id
)+BW_TIMER_LIMIT
;
475 r
.start
= CSR_BASE(0)+BW_TIMER_LIMIT
;
478 sun4d_timers
= (struct sun4d_timer_regs
*) of_ioremap(&r
, 0,
479 PAGE_SIZE
, "user timer");
481 sun4d_timers
->l10_timer_limit
= (((1000000/HZ
) + 1) << 10);
482 master_l10_counter
= &sun4d_timers
->l10_cur_count
;
483 master_l10_limit
= &sun4d_timers
->l10_timer_limit
;
485 irq
= request_irq(TIMER_IRQ
,
487 (IRQF_DISABLED
| SA_STATIC_ALLOC
),
490 prom_printf("time_init: unable to attach IRQ%d\n",TIMER_IRQ
);
494 /* Enable user timer free run for CPU 0 in BW */
495 /* bw_set_ctrl(0, bw_get_ctrl(0) | BW_CTRL_USER_TIMER); */
498 while (!cpu_find_by_instance(cpu
, NULL
, &mid
)) {
499 sun4d_load_profile_irq(mid
>> 3, 0);
506 extern unsigned long lvl14_save
[4];
507 struct tt_entry
*trap_table
= &sparc_ttable
[SP_TRAP_IRQ1
+ (14 - 1)];
508 extern unsigned int real_irq_entry
[], smp4d_ticker
[];
509 extern unsigned int patchme_maybe_smp_msg
[];
511 /* Adjust so that we jump directly to smp4d_ticker */
512 lvl14_save
[2] += smp4d_ticker
- real_irq_entry
;
514 /* For SMP we use the level 14 ticker, however the bootup code
515 * has copied the firmware's level 14 vector into the boot cpu's
516 * trap table, we must fix this now or we get squashed.
518 local_irq_save(flags
);
519 patchme_maybe_smp_msg
[0] = 0x01000000; /* NOP out the branch */
520 trap_table
->inst_one
= lvl14_save
[0];
521 trap_table
->inst_two
= lvl14_save
[1];
522 trap_table
->inst_three
= lvl14_save
[2];
523 trap_table
->inst_four
= lvl14_save
[3];
524 local_flush_cache_all();
525 local_irq_restore(flags
);
530 void __init
sun4d_init_sbi_irq(void)
532 struct device_node
*dp
;
535 for_each_node_by_name(dp
, "sbi")
537 sbus_actions
= kzalloc (nsbi
* 8 * 4 * sizeof(struct sbus_action
), GFP_ATOMIC
);
539 prom_printf("SUN4D: Cannot allocate sbus_actions, halting.\n");
542 for_each_node_by_name(dp
, "sbi") {
543 int devid
= of_getintprop_default(dp
, "device-id", 0);
544 int board
= of_getintprop_default(dp
, "board#", 0);
549 extern unsigned char boot_cpu_id
;
551 set_sbi_tid(devid
, boot_cpu_id
<< 3);
552 sbus_tid
[board
] = boot_cpu_id
;
555 /* Get rid of pending irqs from PROM */
556 mask
= acquire_sbi(devid
, 0xffffffff);
558 printk ("Clearing pending IRQs %08x on SBI %d\n", mask
, board
);
559 release_sbi(devid
, mask
);
564 void __init
sun4d_init_IRQ(void)
568 BTFIXUPSET_CALL(enable_irq
, sun4d_enable_irq
, BTFIXUPCALL_NORM
);
569 BTFIXUPSET_CALL(disable_irq
, sun4d_disable_irq
, BTFIXUPCALL_NORM
);
570 BTFIXUPSET_CALL(clear_clock_irq
, sun4d_clear_clock_irq
, BTFIXUPCALL_NORM
);
571 BTFIXUPSET_CALL(clear_profile_irq
, sun4d_clear_profile_irq
, BTFIXUPCALL_NORM
);
572 BTFIXUPSET_CALL(load_profile_irq
, sun4d_load_profile_irq
, BTFIXUPCALL_NORM
);
573 sparc_init_timers
= sun4d_init_timers
;
575 BTFIXUPSET_CALL(set_cpu_int
, sun4d_set_cpu_int
, BTFIXUPCALL_NORM
);
576 BTFIXUPSET_CALL(clear_cpu_int
, sun4d_clear_ipi
, BTFIXUPCALL_NOP
);
577 BTFIXUPSET_CALL(set_irq_udt
, sun4d_set_udt
, BTFIXUPCALL_NOP
);
579 /* Cannot enable interrupts until OBP ticker is disabled. */