2 * Copyright 2001 MontaVista Software Inc.
3 * Author: MontaVista Software, Inc.
4 * ppopov@mvista.com or source@mvista.com
6 * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
14 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
15 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
16 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
19 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <linux/bitops.h>
29 #include <linux/init.h>
31 #include <linux/interrupt.h>
32 #include <linux/irq.h>
34 #include <asm/irq_cpu.h>
35 #include <asm/mipsregs.h>
36 #include <asm/mach-au1x00/au1000.h>
37 #ifdef CONFIG_MIPS_PB1000
38 #include <asm/mach-pb1x00/pb1000.h>
41 #define EXT_INTC0_REQ0 2 /* IP 2 */
42 #define EXT_INTC0_REQ1 3 /* IP 3 */
43 #define EXT_INTC1_REQ0 4 /* IP 4 */
44 #define EXT_INTC1_REQ1 5 /* IP 5 */
45 #define MIPS_TIMER_IP 7 /* IP 7 */
47 void (*board_init_irq)(void) __initdata = NULL;
49 static DEFINE_SPINLOCK(irq_lock);
54 * Save/restore the interrupt controller state.
55 * Called from the save/restore core registers as part of the
56 * au_sleep function in power.c.....maybe I should just pm_register()
59 static unsigned int sleep_intctl_config0[2];
60 static unsigned int sleep_intctl_config1[2];
61 static unsigned int sleep_intctl_config2[2];
62 static unsigned int sleep_intctl_src[2];
63 static unsigned int sleep_intctl_assign[2];
64 static unsigned int sleep_intctl_wake[2];
65 static unsigned int sleep_intctl_mask[2];
67 void save_au1xxx_intctl(void)
69 sleep_intctl_config0[0] = au_readl(IC0_CFG0RD);
70 sleep_intctl_config1[0] = au_readl(IC0_CFG1RD);
71 sleep_intctl_config2[0] = au_readl(IC0_CFG2RD);
72 sleep_intctl_src[0] = au_readl(IC0_SRCRD);
73 sleep_intctl_assign[0] = au_readl(IC0_ASSIGNRD);
74 sleep_intctl_wake[0] = au_readl(IC0_WAKERD);
75 sleep_intctl_mask[0] = au_readl(IC0_MASKRD);
77 sleep_intctl_config0[1] = au_readl(IC1_CFG0RD);
78 sleep_intctl_config1[1] = au_readl(IC1_CFG1RD);
79 sleep_intctl_config2[1] = au_readl(IC1_CFG2RD);
80 sleep_intctl_src[1] = au_readl(IC1_SRCRD);
81 sleep_intctl_assign[1] = au_readl(IC1_ASSIGNRD);
82 sleep_intctl_wake[1] = au_readl(IC1_WAKERD);
83 sleep_intctl_mask[1] = au_readl(IC1_MASKRD);
87 * For most restore operations, we clear the entire register and
88 * then set the bits we found during the save.
90 void restore_au1xxx_intctl(void)
92 au_writel(0xffffffff, IC0_MASKCLR); au_sync();
94 au_writel(0xffffffff, IC0_CFG0CLR); au_sync();
95 au_writel(sleep_intctl_config0[0], IC0_CFG0SET); au_sync();
96 au_writel(0xffffffff, IC0_CFG1CLR); au_sync();
97 au_writel(sleep_intctl_config1[0], IC0_CFG1SET); au_sync();
98 au_writel(0xffffffff, IC0_CFG2CLR); au_sync();
99 au_writel(sleep_intctl_config2[0], IC0_CFG2SET); au_sync();
100 au_writel(0xffffffff, IC0_SRCCLR); au_sync();
101 au_writel(sleep_intctl_src[0], IC0_SRCSET); au_sync();
102 au_writel(0xffffffff, IC0_ASSIGNCLR); au_sync();
103 au_writel(sleep_intctl_assign[0], IC0_ASSIGNSET); au_sync();
104 au_writel(0xffffffff, IC0_WAKECLR); au_sync();
105 au_writel(sleep_intctl_wake[0], IC0_WAKESET); au_sync();
106 au_writel(0xffffffff, IC0_RISINGCLR); au_sync();
107 au_writel(0xffffffff, IC0_FALLINGCLR); au_sync();
108 au_writel(0x00000000, IC0_TESTBIT); au_sync();
110 au_writel(0xffffffff, IC1_MASKCLR); au_sync();
112 au_writel(0xffffffff, IC1_CFG0CLR); au_sync();
113 au_writel(sleep_intctl_config0[1], IC1_CFG0SET); au_sync();
114 au_writel(0xffffffff, IC1_CFG1CLR); au_sync();
115 au_writel(sleep_intctl_config1[1], IC1_CFG1SET); au_sync();
116 au_writel(0xffffffff, IC1_CFG2CLR); au_sync();
117 au_writel(sleep_intctl_config2[1], IC1_CFG2SET); au_sync();
118 au_writel(0xffffffff, IC1_SRCCLR); au_sync();
119 au_writel(sleep_intctl_src[1], IC1_SRCSET); au_sync();
120 au_writel(0xffffffff, IC1_ASSIGNCLR); au_sync();
121 au_writel(sleep_intctl_assign[1], IC1_ASSIGNSET); au_sync();
122 au_writel(0xffffffff, IC1_WAKECLR); au_sync();
123 au_writel(sleep_intctl_wake[1], IC1_WAKESET); au_sync();
124 au_writel(0xffffffff, IC1_RISINGCLR); au_sync();
125 au_writel(0xffffffff, IC1_FALLINGCLR); au_sync();
126 au_writel(0x00000000, IC1_TESTBIT); au_sync();
128 au_writel(sleep_intctl_mask[1], IC1_MASKSET); au_sync();
130 au_writel(sleep_intctl_mask[0], IC0_MASKSET); au_sync();
132 #endif /* CONFIG_PM */
135 inline void local_enable_irq(unsigned int irq_nr)
137 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
140 au_writel(1 << (bit - 32), IC1_MASKSET);
141 au_writel(1 << (bit - 32), IC1_WAKESET);
143 au_writel(1 << bit, IC0_MASKSET);
144 au_writel(1 << bit, IC0_WAKESET);
150 inline void local_disable_irq(unsigned int irq_nr)
152 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
155 au_writel(1 << (bit - 32), IC1_MASKCLR);
156 au_writel(1 << (bit - 32), IC1_WAKECLR);
158 au_writel(1 << bit, IC0_MASKCLR);
159 au_writel(1 << bit, IC0_WAKECLR);
165 static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
167 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
170 au_writel(1 << (bit - 32), IC1_RISINGCLR);
171 au_writel(1 << (bit - 32), IC1_MASKCLR);
173 au_writel(1 << bit, IC0_RISINGCLR);
174 au_writel(1 << bit, IC0_MASKCLR);
180 static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
182 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
185 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
186 au_writel(1 << (bit - 32), IC1_MASKCLR);
188 au_writel(1 << bit, IC0_FALLINGCLR);
189 au_writel(1 << bit, IC0_MASKCLR);
195 static inline void mask_and_ack_either_edge_irq(unsigned int irq_nr)
197 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
200 * This may assume that we don't get interrupts from
201 * both edges at once, or if we do, that we don't care.
204 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
205 au_writel(1 << (bit - 32), IC1_RISINGCLR);
206 au_writel(1 << (bit - 32), IC1_MASKCLR);
208 au_writel(1 << bit, IC0_FALLINGCLR);
209 au_writel(1 << bit, IC0_RISINGCLR);
210 au_writel(1 << bit, IC0_MASKCLR);
216 static inline void mask_and_ack_level_irq(unsigned int irq_nr)
219 local_disable_irq(irq_nr);
221 #if defined(CONFIG_MIPS_PB1000)
222 if (irq_nr == AU1000_GPIO_15) {
223 au_writel(0x8000, PB1000_MDR); /* ack int */
229 static void end_irq(unsigned int irq_nr)
231 if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
232 local_enable_irq(irq_nr);
234 #if defined(CONFIG_MIPS_PB1000)
235 if (irq_nr == AU1000_GPIO_15) {
236 au_writel(0x4000, PB1000_MDR); /* enable int */
242 unsigned long save_local_and_disable(int controller)
245 unsigned long flags, mask;
247 spin_lock_irqsave(&irq_lock, flags);
249 mask = au_readl(IC1_MASKSET);
250 for (i = 32; i < 64; i++)
251 local_disable_irq(i);
253 mask = au_readl(IC0_MASKSET);
254 for (i = 0; i < 32; i++)
255 local_disable_irq(i);
257 spin_unlock_irqrestore(&irq_lock, flags);
262 void restore_local_and_enable(int controller, unsigned long mask)
265 unsigned long flags, new_mask;
267 spin_lock_irqsave(&irq_lock, flags);
268 for (i = 0; i < 32; i++) {
269 if (mask & (1 << i)) {
271 local_enable_irq(i + 32);
277 new_mask = au_readl(IC1_MASKSET);
279 new_mask = au_readl(IC0_MASKSET);
281 spin_unlock_irqrestore(&irq_lock, flags);
285 static struct irq_chip rise_edge_irq_type = {
286 .name = "Au1000 Rise Edge",
287 .ack = mask_and_ack_rise_edge_irq,
288 .mask = local_disable_irq,
289 .mask_ack = mask_and_ack_rise_edge_irq,
290 .unmask = local_enable_irq,
294 static struct irq_chip fall_edge_irq_type = {
295 .name = "Au1000 Fall Edge",
296 .ack = mask_and_ack_fall_edge_irq,
297 .mask = local_disable_irq,
298 .mask_ack = mask_and_ack_fall_edge_irq,
299 .unmask = local_enable_irq,
303 static struct irq_chip either_edge_irq_type = {
304 .name = "Au1000 Rise or Fall Edge",
305 .ack = mask_and_ack_either_edge_irq,
306 .mask = local_disable_irq,
307 .mask_ack = mask_and_ack_either_edge_irq,
308 .unmask = local_enable_irq,
312 static struct irq_chip level_irq_type = {
313 .name = "Au1000 Level",
314 .ack = mask_and_ack_level_irq,
315 .mask = local_disable_irq,
316 .mask_ack = mask_and_ack_level_irq,
317 .unmask = local_enable_irq,
322 void startup_match20_interrupt(irq_handler_t handler)
324 struct irq_desc *desc = &irq_desc[AU1000_TOY_MATCH2_INT];
326 static struct irqaction action;
327 memset(&action, 0, sizeof(struct irqaction));
330 * This is a big problem.... since we didn't use request_irq
331 * when kernel/irq.c calls probe_irq_xxx this interrupt will
332 * be probed for usage. This will end up disabling the device :(
333 * Give it a bogus "action" pointer -- this will keep it from
334 * getting auto-probed!
336 * By setting the status to match that of request_irq() we
337 * can avoid it. --cgray
339 action.dev_id = handler;
340 action.flags = IRQF_DISABLED;
341 cpus_clear(action.mask);
342 action.name = "Au1xxx TOY";
343 action.handler = handler;
346 desc->action = &action;
347 desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
349 local_enable_irq(AU1000_TOY_MATCH2_INT);
353 static void __init setup_local_irq(unsigned int irq_nr, int type, int int_req)
355 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
357 if (irq_nr > AU1000_MAX_INTR)
360 /* Config2[n], Config1[n], Config0[n] */
363 case INTC_INT_RISE_EDGE: /* 0:0:1 */
364 au_writel(1 << (bit - 32), IC1_CFG2CLR);
365 au_writel(1 << (bit - 32), IC1_CFG1CLR);
366 au_writel(1 << (bit - 32), IC1_CFG0SET);
367 set_irq_chip(irq_nr, &rise_edge_irq_type);
369 case INTC_INT_FALL_EDGE: /* 0:1:0 */
370 au_writel(1 << (bit - 32), IC1_CFG2CLR);
371 au_writel(1 << (bit - 32), IC1_CFG1SET);
372 au_writel(1 << (bit - 32), IC1_CFG0CLR);
373 set_irq_chip(irq_nr, &fall_edge_irq_type);
375 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
376 au_writel(1 << (bit - 32), IC1_CFG2CLR);
377 au_writel(1 << (bit - 32), IC1_CFG1SET);
378 au_writel(1 << (bit - 32), IC1_CFG0SET);
379 set_irq_chip(irq_nr, &either_edge_irq_type);
381 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
382 au_writel(1 << (bit - 32), IC1_CFG2SET);
383 au_writel(1 << (bit - 32), IC1_CFG1CLR);
384 au_writel(1 << (bit - 32), IC1_CFG0SET);
385 set_irq_chip(irq_nr, &level_irq_type);
387 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
388 au_writel(1 << (bit - 32), IC1_CFG2SET);
389 au_writel(1 << (bit - 32), IC1_CFG1SET);
390 au_writel(1 << (bit - 32), IC1_CFG0CLR);
391 set_irq_chip(irq_nr, &level_irq_type);
393 case INTC_INT_DISABLED: /* 0:0:0 */
394 au_writel(1 << (bit - 32), IC1_CFG0CLR);
395 au_writel(1 << (bit - 32), IC1_CFG1CLR);
396 au_writel(1 << (bit - 32), IC1_CFG2CLR);
398 default: /* disable the interrupt */
399 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
401 au_writel(1 << (bit - 32), IC1_CFG0CLR);
402 au_writel(1 << (bit - 32), IC1_CFG1CLR);
403 au_writel(1 << (bit - 32), IC1_CFG2CLR);
406 if (int_req) /* assign to interrupt request 1 */
407 au_writel(1 << (bit - 32), IC1_ASSIGNCLR);
408 else /* assign to interrupt request 0 */
409 au_writel(1 << (bit - 32), IC1_ASSIGNSET);
410 au_writel(1 << (bit - 32), IC1_SRCSET);
411 au_writel(1 << (bit - 32), IC1_MASKCLR);
412 au_writel(1 << (bit - 32), IC1_WAKECLR);
415 case INTC_INT_RISE_EDGE: /* 0:0:1 */
416 au_writel(1 << bit, IC0_CFG2CLR);
417 au_writel(1 << bit, IC0_CFG1CLR);
418 au_writel(1 << bit, IC0_CFG0SET);
419 set_irq_chip(irq_nr, &rise_edge_irq_type);
421 case INTC_INT_FALL_EDGE: /* 0:1:0 */
422 au_writel(1 << bit, IC0_CFG2CLR);
423 au_writel(1 << bit, IC0_CFG1SET);
424 au_writel(1 << bit, IC0_CFG0CLR);
425 set_irq_chip(irq_nr, &fall_edge_irq_type);
427 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
428 au_writel(1 << bit, IC0_CFG2CLR);
429 au_writel(1 << bit, IC0_CFG1SET);
430 au_writel(1 << bit, IC0_CFG0SET);
431 set_irq_chip(irq_nr, &either_edge_irq_type);
433 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
434 au_writel(1 << bit, IC0_CFG2SET);
435 au_writel(1 << bit, IC0_CFG1CLR);
436 au_writel(1 << bit, IC0_CFG0SET);
437 set_irq_chip(irq_nr, &level_irq_type);
439 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
440 au_writel(1 << bit, IC0_CFG2SET);
441 au_writel(1 << bit, IC0_CFG1SET);
442 au_writel(1 << bit, IC0_CFG0CLR);
443 set_irq_chip(irq_nr, &level_irq_type);
445 case INTC_INT_DISABLED: /* 0:0:0 */
446 au_writel(1 << bit, IC0_CFG0CLR);
447 au_writel(1 << bit, IC0_CFG1CLR);
448 au_writel(1 << bit, IC0_CFG2CLR);
450 default: /* disable the interrupt */
451 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
453 au_writel(1 << bit, IC0_CFG0CLR);
454 au_writel(1 << bit, IC0_CFG1CLR);
455 au_writel(1 << bit, IC0_CFG2CLR);
458 if (int_req) /* assign to interrupt request 1 */
459 au_writel(1 << bit, IC0_ASSIGNCLR);
460 else /* assign to interrupt request 0 */
461 au_writel(1 << bit, IC0_ASSIGNSET);
462 au_writel(1 << bit, IC0_SRCSET);
463 au_writel(1 << bit, IC0_MASKCLR);
464 au_writel(1 << bit, IC0_WAKECLR);
470 * Interrupts are nested. Even if an interrupt handler is registered
471 * as "fast", we might get another interrupt before we return from
472 * intcX_reqX_irqdispatch().
475 static void intc0_req0_irqdispatch(void)
477 static unsigned long intc0_req0;
480 intc0_req0 |= au_readl(IC0_REQ0INT);
485 #ifdef AU1000_USB_DEV_REQ_INT
487 * Because of the tight timing of SETUP token to reply
488 * transactions, the USB devices-side packet complete
489 * interrupt needs the highest priority.
491 if ((intc0_req0 & (1 << AU1000_USB_DEV_REQ_INT))) {
492 intc0_req0 &= ~(1 << AU1000_USB_DEV_REQ_INT);
493 do_IRQ(AU1000_USB_DEV_REQ_INT);
497 bit = ffs(intc0_req0);
498 intc0_req0 &= ~(1 << bit);
499 do_IRQ(MIPS_CPU_IRQ_BASE + bit);
503 static void intc0_req1_irqdispatch(void)
505 static unsigned long intc0_req1;
508 intc0_req1 |= au_readl(IC0_REQ1INT);
513 bit = ffs(intc0_req1);
514 intc0_req1 &= ~(1 << bit);
520 * Interrupt Controller 1:
523 static void intc1_req0_irqdispatch(void)
525 static unsigned long intc1_req0;
528 intc1_req0 |= au_readl(IC1_REQ0INT);
533 bit = ffs(intc1_req0);
534 intc1_req0 &= ~(1 << bit);
535 do_IRQ(MIPS_CPU_IRQ_BASE + 32 + bit);
539 static void intc1_req1_irqdispatch(void)
541 static unsigned long intc1_req1;
544 intc1_req1 |= au_readl(IC1_REQ1INT);
549 bit = ffs(intc1_req1);
550 intc1_req1 &= ~(1 << bit);
551 do_IRQ(MIPS_CPU_IRQ_BASE + 32 + bit);
554 asmlinkage void plat_irq_dispatch(void)
556 unsigned int pending = read_c0_status() & read_c0_cause();
558 if (pending & CAUSEF_IP7)
559 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
560 else if (pending & CAUSEF_IP2)
561 intc0_req0_irqdispatch();
562 else if (pending & CAUSEF_IP3)
563 intc0_req1_irqdispatch();
564 else if (pending & CAUSEF_IP4)
565 intc1_req0_irqdispatch();
566 else if (pending & CAUSEF_IP5)
567 intc1_req1_irqdispatch();
569 spurious_interrupt();
572 void __init arch_init_irq(void)
575 struct au1xxx_irqmap *imp;
576 extern struct au1xxx_irqmap au1xxx_irq_map[];
577 extern struct au1xxx_irqmap au1xxx_ic0_map[];
578 extern int au1xxx_nr_irqs;
579 extern int au1xxx_ic0_nr_irqs;
582 * Initialize interrupt controllers to a safe state.
584 au_writel(0xffffffff, IC0_CFG0CLR);
585 au_writel(0xffffffff, IC0_CFG1CLR);
586 au_writel(0xffffffff, IC0_CFG2CLR);
587 au_writel(0xffffffff, IC0_MASKCLR);
588 au_writel(0xffffffff, IC0_ASSIGNSET);
589 au_writel(0xffffffff, IC0_WAKECLR);
590 au_writel(0xffffffff, IC0_SRCSET);
591 au_writel(0xffffffff, IC0_FALLINGCLR);
592 au_writel(0xffffffff, IC0_RISINGCLR);
593 au_writel(0x00000000, IC0_TESTBIT);
595 au_writel(0xffffffff, IC1_CFG0CLR);
596 au_writel(0xffffffff, IC1_CFG1CLR);
597 au_writel(0xffffffff, IC1_CFG2CLR);
598 au_writel(0xffffffff, IC1_MASKCLR);
599 au_writel(0xffffffff, IC1_ASSIGNSET);
600 au_writel(0xffffffff, IC1_WAKECLR);
601 au_writel(0xffffffff, IC1_SRCSET);
602 au_writel(0xffffffff, IC1_FALLINGCLR);
603 au_writel(0xffffffff, IC1_RISINGCLR);
604 au_writel(0x00000000, IC1_TESTBIT);
609 * Initialize IC0, which is fixed per processor.
611 imp = au1xxx_ic0_map;
612 for (i = 0; i < au1xxx_ic0_nr_irqs; i++) {
613 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
618 * Now set up the irq mapping for the board.
620 imp = au1xxx_irq_map;
621 for (i = 0; i < au1xxx_nr_irqs; i++) {
622 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
626 set_c0_status(ALLINTS);
628 /* Board specific IRQ initialization.