2 * Copyright 2001, 2007-2008 MontaVista Software Inc.
3 * Author: MontaVista Software, Inc. <source@mvista.com>
5 * Copyright (C) 2007 Ralf Baechle (ralf@linux-mips.org)
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2 of the License, or (at your
10 * option) any later version.
12 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
13 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
15 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
18 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
19 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 * You should have received a copy of the GNU General Public License along
24 * with this program; if not, write to the Free Software Foundation, Inc.,
25 * 675 Mass Ave, Cambridge, MA 02139, USA.
27 #include <linux/bitops.h>
28 #include <linux/init.h>
30 #include <linux/interrupt.h>
31 #include <linux/irq.h>
33 #include <asm/irq_cpu.h>
34 #include <asm/mipsregs.h>
35 #include <asm/mach-au1x00/au1000.h>
36 #ifdef CONFIG_MIPS_PB1000
37 #include <asm/mach-pb1x00/pb1000.h>
40 #define EXT_INTC0_REQ0 2 /* IP 2 */
41 #define EXT_INTC0_REQ1 3 /* IP 3 */
42 #define EXT_INTC1_REQ0 4 /* IP 4 */
43 #define EXT_INTC1_REQ1 5 /* IP 5 */
44 #define MIPS_TIMER_IP 7 /* IP 7 */
46 void (*board_init_irq)(void) __initdata = NULL;
48 static DEFINE_SPINLOCK(irq_lock);
53 * Save/restore the interrupt controller state.
54 * Called from the save/restore core registers as part of the
55 * au_sleep function in power.c.....maybe I should just pm_register()
58 static unsigned int sleep_intctl_config0[2];
59 static unsigned int sleep_intctl_config1[2];
60 static unsigned int sleep_intctl_config2[2];
61 static unsigned int sleep_intctl_src[2];
62 static unsigned int sleep_intctl_assign[2];
63 static unsigned int sleep_intctl_wake[2];
64 static unsigned int sleep_intctl_mask[2];
66 void save_au1xxx_intctl(void)
68 sleep_intctl_config0[0] = au_readl(IC0_CFG0RD);
69 sleep_intctl_config1[0] = au_readl(IC0_CFG1RD);
70 sleep_intctl_config2[0] = au_readl(IC0_CFG2RD);
71 sleep_intctl_src[0] = au_readl(IC0_SRCRD);
72 sleep_intctl_assign[0] = au_readl(IC0_ASSIGNRD);
73 sleep_intctl_wake[0] = au_readl(IC0_WAKERD);
74 sleep_intctl_mask[0] = au_readl(IC0_MASKRD);
76 sleep_intctl_config0[1] = au_readl(IC1_CFG0RD);
77 sleep_intctl_config1[1] = au_readl(IC1_CFG1RD);
78 sleep_intctl_config2[1] = au_readl(IC1_CFG2RD);
79 sleep_intctl_src[1] = au_readl(IC1_SRCRD);
80 sleep_intctl_assign[1] = au_readl(IC1_ASSIGNRD);
81 sleep_intctl_wake[1] = au_readl(IC1_WAKERD);
82 sleep_intctl_mask[1] = au_readl(IC1_MASKRD);
86 * For most restore operations, we clear the entire register and
87 * then set the bits we found during the save.
89 void restore_au1xxx_intctl(void)
91 au_writel(0xffffffff, IC0_MASKCLR); au_sync();
93 au_writel(0xffffffff, IC0_CFG0CLR); au_sync();
94 au_writel(sleep_intctl_config0[0], IC0_CFG0SET); au_sync();
95 au_writel(0xffffffff, IC0_CFG1CLR); au_sync();
96 au_writel(sleep_intctl_config1[0], IC0_CFG1SET); au_sync();
97 au_writel(0xffffffff, IC0_CFG2CLR); au_sync();
98 au_writel(sleep_intctl_config2[0], IC0_CFG2SET); au_sync();
99 au_writel(0xffffffff, IC0_SRCCLR); au_sync();
100 au_writel(sleep_intctl_src[0], IC0_SRCSET); au_sync();
101 au_writel(0xffffffff, IC0_ASSIGNCLR); au_sync();
102 au_writel(sleep_intctl_assign[0], IC0_ASSIGNSET); au_sync();
103 au_writel(0xffffffff, IC0_WAKECLR); au_sync();
104 au_writel(sleep_intctl_wake[0], IC0_WAKESET); au_sync();
105 au_writel(0xffffffff, IC0_RISINGCLR); au_sync();
106 au_writel(0xffffffff, IC0_FALLINGCLR); au_sync();
107 au_writel(0x00000000, IC0_TESTBIT); au_sync();
109 au_writel(0xffffffff, IC1_MASKCLR); au_sync();
111 au_writel(0xffffffff, IC1_CFG0CLR); au_sync();
112 au_writel(sleep_intctl_config0[1], IC1_CFG0SET); au_sync();
113 au_writel(0xffffffff, IC1_CFG1CLR); au_sync();
114 au_writel(sleep_intctl_config1[1], IC1_CFG1SET); au_sync();
115 au_writel(0xffffffff, IC1_CFG2CLR); au_sync();
116 au_writel(sleep_intctl_config2[1], IC1_CFG2SET); au_sync();
117 au_writel(0xffffffff, IC1_SRCCLR); au_sync();
118 au_writel(sleep_intctl_src[1], IC1_SRCSET); au_sync();
119 au_writel(0xffffffff, IC1_ASSIGNCLR); au_sync();
120 au_writel(sleep_intctl_assign[1], IC1_ASSIGNSET); au_sync();
121 au_writel(0xffffffff, IC1_WAKECLR); au_sync();
122 au_writel(sleep_intctl_wake[1], IC1_WAKESET); au_sync();
123 au_writel(0xffffffff, IC1_RISINGCLR); au_sync();
124 au_writel(0xffffffff, IC1_FALLINGCLR); au_sync();
125 au_writel(0x00000000, IC1_TESTBIT); au_sync();
127 au_writel(sleep_intctl_mask[1], IC1_MASKSET); au_sync();
129 au_writel(sleep_intctl_mask[0], IC0_MASKSET); au_sync();
131 #endif /* CONFIG_PM */
134 inline void local_enable_irq(unsigned int irq_nr)
136 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
139 au_writel(1 << (bit - 32), IC1_MASKSET);
140 au_writel(1 << (bit - 32), IC1_WAKESET);
142 au_writel(1 << bit, IC0_MASKSET);
143 au_writel(1 << bit, IC0_WAKESET);
149 inline void local_disable_irq(unsigned int irq_nr)
151 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
154 au_writel(1 << (bit - 32), IC1_MASKCLR);
155 au_writel(1 << (bit - 32), IC1_WAKECLR);
157 au_writel(1 << bit, IC0_MASKCLR);
158 au_writel(1 << bit, IC0_WAKECLR);
164 static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
166 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
169 au_writel(1 << (bit - 32), IC1_RISINGCLR);
170 au_writel(1 << (bit - 32), IC1_MASKCLR);
172 au_writel(1 << bit, IC0_RISINGCLR);
173 au_writel(1 << bit, IC0_MASKCLR);
179 static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
181 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
184 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
185 au_writel(1 << (bit - 32), IC1_MASKCLR);
187 au_writel(1 << bit, IC0_FALLINGCLR);
188 au_writel(1 << bit, IC0_MASKCLR);
194 static inline void mask_and_ack_either_edge_irq(unsigned int irq_nr)
196 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
199 * This may assume that we don't get interrupts from
200 * both edges at once, or if we do, that we don't care.
203 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
204 au_writel(1 << (bit - 32), IC1_RISINGCLR);
205 au_writel(1 << (bit - 32), IC1_MASKCLR);
207 au_writel(1 << bit, IC0_FALLINGCLR);
208 au_writel(1 << bit, IC0_RISINGCLR);
209 au_writel(1 << bit, IC0_MASKCLR);
215 static inline void mask_and_ack_level_irq(unsigned int irq_nr)
218 local_disable_irq(irq_nr);
220 #if defined(CONFIG_MIPS_PB1000)
221 if (irq_nr == AU1000_GPIO_15) {
222 au_writel(0x8000, PB1000_MDR); /* ack int */
228 static void end_irq(unsigned int irq_nr)
230 if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
231 local_enable_irq(irq_nr);
233 #if defined(CONFIG_MIPS_PB1000)
234 if (irq_nr == AU1000_GPIO_15) {
235 au_writel(0x4000, PB1000_MDR); /* enable int */
241 unsigned long save_local_and_disable(int controller)
244 unsigned long flags, mask;
246 spin_lock_irqsave(&irq_lock, flags);
248 mask = au_readl(IC1_MASKSET);
249 for (i = 32; i < 64; i++)
250 local_disable_irq(i);
252 mask = au_readl(IC0_MASKSET);
253 for (i = 0; i < 32; i++)
254 local_disable_irq(i);
256 spin_unlock_irqrestore(&irq_lock, flags);
261 void restore_local_and_enable(int controller, unsigned long mask)
264 unsigned long flags, new_mask;
266 spin_lock_irqsave(&irq_lock, flags);
267 for (i = 0; i < 32; i++) {
268 if (mask & (1 << i)) {
270 local_enable_irq(i + 32);
276 new_mask = au_readl(IC1_MASKSET);
278 new_mask = au_readl(IC0_MASKSET);
280 spin_unlock_irqrestore(&irq_lock, flags);
284 static struct irq_chip rise_edge_irq_type = {
285 .name = "Au1000 Rise Edge",
286 .ack = mask_and_ack_rise_edge_irq,
287 .mask = local_disable_irq,
288 .mask_ack = mask_and_ack_rise_edge_irq,
289 .unmask = local_enable_irq,
293 static struct irq_chip fall_edge_irq_type = {
294 .name = "Au1000 Fall Edge",
295 .ack = mask_and_ack_fall_edge_irq,
296 .mask = local_disable_irq,
297 .mask_ack = mask_and_ack_fall_edge_irq,
298 .unmask = local_enable_irq,
302 static struct irq_chip either_edge_irq_type = {
303 .name = "Au1000 Rise or Fall Edge",
304 .ack = mask_and_ack_either_edge_irq,
305 .mask = local_disable_irq,
306 .mask_ack = mask_and_ack_either_edge_irq,
307 .unmask = local_enable_irq,
311 static struct irq_chip level_irq_type = {
312 .name = "Au1000 Level",
313 .ack = mask_and_ack_level_irq,
314 .mask = local_disable_irq,
315 .mask_ack = mask_and_ack_level_irq,
316 .unmask = local_enable_irq,
320 static void __init setup_local_irq(unsigned int irq_nr, int type, int int_req)
322 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
324 if (irq_nr > AU1000_MAX_INTR)
327 /* Config2[n], Config1[n], Config0[n] */
330 case INTC_INT_RISE_EDGE: /* 0:0:1 */
331 au_writel(1 << (bit - 32), IC1_CFG2CLR);
332 au_writel(1 << (bit - 32), IC1_CFG1CLR);
333 au_writel(1 << (bit - 32), IC1_CFG0SET);
334 set_irq_chip(irq_nr, &rise_edge_irq_type);
336 case INTC_INT_FALL_EDGE: /* 0:1:0 */
337 au_writel(1 << (bit - 32), IC1_CFG2CLR);
338 au_writel(1 << (bit - 32), IC1_CFG1SET);
339 au_writel(1 << (bit - 32), IC1_CFG0CLR);
340 set_irq_chip(irq_nr, &fall_edge_irq_type);
342 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
343 au_writel(1 << (bit - 32), IC1_CFG2CLR);
344 au_writel(1 << (bit - 32), IC1_CFG1SET);
345 au_writel(1 << (bit - 32), IC1_CFG0SET);
346 set_irq_chip(irq_nr, &either_edge_irq_type);
348 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
349 au_writel(1 << (bit - 32), IC1_CFG2SET);
350 au_writel(1 << (bit - 32), IC1_CFG1CLR);
351 au_writel(1 << (bit - 32), IC1_CFG0SET);
352 set_irq_chip(irq_nr, &level_irq_type);
354 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
355 au_writel(1 << (bit - 32), IC1_CFG2SET);
356 au_writel(1 << (bit - 32), IC1_CFG1SET);
357 au_writel(1 << (bit - 32), IC1_CFG0CLR);
358 set_irq_chip(irq_nr, &level_irq_type);
360 case INTC_INT_DISABLED: /* 0:0:0 */
361 au_writel(1 << (bit - 32), IC1_CFG0CLR);
362 au_writel(1 << (bit - 32), IC1_CFG1CLR);
363 au_writel(1 << (bit - 32), IC1_CFG2CLR);
365 default: /* disable the interrupt */
366 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
368 au_writel(1 << (bit - 32), IC1_CFG0CLR);
369 au_writel(1 << (bit - 32), IC1_CFG1CLR);
370 au_writel(1 << (bit - 32), IC1_CFG2CLR);
373 if (int_req) /* assign to interrupt request 1 */
374 au_writel(1 << (bit - 32), IC1_ASSIGNCLR);
375 else /* assign to interrupt request 0 */
376 au_writel(1 << (bit - 32), IC1_ASSIGNSET);
377 au_writel(1 << (bit - 32), IC1_SRCSET);
378 au_writel(1 << (bit - 32), IC1_MASKCLR);
379 au_writel(1 << (bit - 32), IC1_WAKECLR);
382 case INTC_INT_RISE_EDGE: /* 0:0:1 */
383 au_writel(1 << bit, IC0_CFG2CLR);
384 au_writel(1 << bit, IC0_CFG1CLR);
385 au_writel(1 << bit, IC0_CFG0SET);
386 set_irq_chip(irq_nr, &rise_edge_irq_type);
388 case INTC_INT_FALL_EDGE: /* 0:1:0 */
389 au_writel(1 << bit, IC0_CFG2CLR);
390 au_writel(1 << bit, IC0_CFG1SET);
391 au_writel(1 << bit, IC0_CFG0CLR);
392 set_irq_chip(irq_nr, &fall_edge_irq_type);
394 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
395 au_writel(1 << bit, IC0_CFG2CLR);
396 au_writel(1 << bit, IC0_CFG1SET);
397 au_writel(1 << bit, IC0_CFG0SET);
398 set_irq_chip(irq_nr, &either_edge_irq_type);
400 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
401 au_writel(1 << bit, IC0_CFG2SET);
402 au_writel(1 << bit, IC0_CFG1CLR);
403 au_writel(1 << bit, IC0_CFG0SET);
404 set_irq_chip(irq_nr, &level_irq_type);
406 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
407 au_writel(1 << bit, IC0_CFG2SET);
408 au_writel(1 << bit, IC0_CFG1SET);
409 au_writel(1 << bit, IC0_CFG0CLR);
410 set_irq_chip(irq_nr, &level_irq_type);
412 case INTC_INT_DISABLED: /* 0:0:0 */
413 au_writel(1 << bit, IC0_CFG0CLR);
414 au_writel(1 << bit, IC0_CFG1CLR);
415 au_writel(1 << bit, IC0_CFG2CLR);
417 default: /* disable the interrupt */
418 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
420 au_writel(1 << bit, IC0_CFG0CLR);
421 au_writel(1 << bit, IC0_CFG1CLR);
422 au_writel(1 << bit, IC0_CFG2CLR);
425 if (int_req) /* assign to interrupt request 1 */
426 au_writel(1 << bit, IC0_ASSIGNCLR);
427 else /* assign to interrupt request 0 */
428 au_writel(1 << bit, IC0_ASSIGNSET);
429 au_writel(1 << bit, IC0_SRCSET);
430 au_writel(1 << bit, IC0_MASKCLR);
431 au_writel(1 << bit, IC0_WAKECLR);
437 * Interrupts are nested. Even if an interrupt handler is registered
438 * as "fast", we might get another interrupt before we return from
439 * intcX_reqX_irqdispatch().
442 static void intc0_req0_irqdispatch(void)
444 static unsigned long intc0_req0;
447 intc0_req0 |= au_readl(IC0_REQ0INT);
452 #ifdef AU1000_USB_DEV_REQ_INT
454 * Because of the tight timing of SETUP token to reply
455 * transactions, the USB devices-side packet complete
456 * interrupt needs the highest priority.
458 if ((intc0_req0 & (1 << AU1000_USB_DEV_REQ_INT))) {
459 intc0_req0 &= ~(1 << AU1000_USB_DEV_REQ_INT);
460 do_IRQ(AU1000_USB_DEV_REQ_INT);
464 bit = __ffs(intc0_req0);
465 intc0_req0 &= ~(1 << bit);
466 do_IRQ(AU1000_INTC0_INT_BASE + bit);
470 static void intc0_req1_irqdispatch(void)
472 static unsigned long intc0_req1;
475 intc0_req1 |= au_readl(IC0_REQ1INT);
480 bit = __ffs(intc0_req1);
481 intc0_req1 &= ~(1 << bit);
482 do_IRQ(AU1000_INTC0_INT_BASE + bit);
487 * Interrupt Controller 1:
490 static void intc1_req0_irqdispatch(void)
492 static unsigned long intc1_req0;
495 intc1_req0 |= au_readl(IC1_REQ0INT);
500 bit = __ffs(intc1_req0);
501 intc1_req0 &= ~(1 << bit);
502 do_IRQ(AU1000_INTC1_INT_BASE + bit);
506 static void intc1_req1_irqdispatch(void)
508 static unsigned long intc1_req1;
511 intc1_req1 |= au_readl(IC1_REQ1INT);
516 bit = __ffs(intc1_req1);
517 intc1_req1 &= ~(1 << bit);
518 do_IRQ(AU1000_INTC1_INT_BASE + bit);
521 asmlinkage void plat_irq_dispatch(void)
523 unsigned int pending = read_c0_status() & read_c0_cause();
525 if (pending & CAUSEF_IP7)
526 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
527 else if (pending & CAUSEF_IP2)
528 intc0_req0_irqdispatch();
529 else if (pending & CAUSEF_IP3)
530 intc0_req1_irqdispatch();
531 else if (pending & CAUSEF_IP4)
532 intc1_req0_irqdispatch();
533 else if (pending & CAUSEF_IP5)
534 intc1_req1_irqdispatch();
536 spurious_interrupt();
539 void __init arch_init_irq(void)
542 struct au1xxx_irqmap *imp;
543 extern struct au1xxx_irqmap au1xxx_irq_map[];
544 extern struct au1xxx_irqmap au1xxx_ic0_map[];
545 extern int au1xxx_nr_irqs;
546 extern int au1xxx_ic0_nr_irqs;
549 * Initialize interrupt controllers to a safe state.
551 au_writel(0xffffffff, IC0_CFG0CLR);
552 au_writel(0xffffffff, IC0_CFG1CLR);
553 au_writel(0xffffffff, IC0_CFG2CLR);
554 au_writel(0xffffffff, IC0_MASKCLR);
555 au_writel(0xffffffff, IC0_ASSIGNSET);
556 au_writel(0xffffffff, IC0_WAKECLR);
557 au_writel(0xffffffff, IC0_SRCSET);
558 au_writel(0xffffffff, IC0_FALLINGCLR);
559 au_writel(0xffffffff, IC0_RISINGCLR);
560 au_writel(0x00000000, IC0_TESTBIT);
562 au_writel(0xffffffff, IC1_CFG0CLR);
563 au_writel(0xffffffff, IC1_CFG1CLR);
564 au_writel(0xffffffff, IC1_CFG2CLR);
565 au_writel(0xffffffff, IC1_MASKCLR);
566 au_writel(0xffffffff, IC1_ASSIGNSET);
567 au_writel(0xffffffff, IC1_WAKECLR);
568 au_writel(0xffffffff, IC1_SRCSET);
569 au_writel(0xffffffff, IC1_FALLINGCLR);
570 au_writel(0xffffffff, IC1_RISINGCLR);
571 au_writel(0x00000000, IC1_TESTBIT);
576 * Initialize IC0, which is fixed per processor.
578 imp = au1xxx_ic0_map;
579 for (i = 0; i < au1xxx_ic0_nr_irqs; i++) {
580 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
585 * Now set up the irq mapping for the board.
587 imp = au1xxx_irq_map;
588 for (i = 0; i < au1xxx_nr_irqs; i++) {
589 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
593 set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4);
595 /* Board specific IRQ initialization.