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>
29 #include <linux/interrupt.h>
30 #include <linux/irq.h>
32 #include <asm/irq_cpu.h>
33 #include <asm/mipsregs.h>
34 #include <asm/mach-au1x00/au1000.h>
35 #ifdef CONFIG_MIPS_PB1000
36 #include <asm/mach-pb1x00/pb1000.h>
39 #define EXT_INTC0_REQ0 2 /* IP 2 */
40 #define EXT_INTC0_REQ1 3 /* IP 3 */
41 #define EXT_INTC1_REQ0 4 /* IP 4 */
42 #define EXT_INTC1_REQ1 5 /* IP 5 */
43 #define MIPS_TIMER_IP 7 /* IP 7 */
45 void (*board_init_irq)(void) __initdata = NULL;
47 static DEFINE_SPINLOCK(irq_lock);
52 * Save/restore the interrupt controller state.
53 * Called from the save/restore core registers as part of the
54 * au_sleep function in power.c.....maybe I should just pm_register()
57 static unsigned int sleep_intctl_config0[2];
58 static unsigned int sleep_intctl_config1[2];
59 static unsigned int sleep_intctl_config2[2];
60 static unsigned int sleep_intctl_src[2];
61 static unsigned int sleep_intctl_assign[2];
62 static unsigned int sleep_intctl_wake[2];
63 static unsigned int sleep_intctl_mask[2];
65 void save_au1xxx_intctl(void)
67 sleep_intctl_config0[0] = au_readl(IC0_CFG0RD);
68 sleep_intctl_config1[0] = au_readl(IC0_CFG1RD);
69 sleep_intctl_config2[0] = au_readl(IC0_CFG2RD);
70 sleep_intctl_src[0] = au_readl(IC0_SRCRD);
71 sleep_intctl_assign[0] = au_readl(IC0_ASSIGNRD);
72 sleep_intctl_wake[0] = au_readl(IC0_WAKERD);
73 sleep_intctl_mask[0] = au_readl(IC0_MASKRD);
75 sleep_intctl_config0[1] = au_readl(IC1_CFG0RD);
76 sleep_intctl_config1[1] = au_readl(IC1_CFG1RD);
77 sleep_intctl_config2[1] = au_readl(IC1_CFG2RD);
78 sleep_intctl_src[1] = au_readl(IC1_SRCRD);
79 sleep_intctl_assign[1] = au_readl(IC1_ASSIGNRD);
80 sleep_intctl_wake[1] = au_readl(IC1_WAKERD);
81 sleep_intctl_mask[1] = au_readl(IC1_MASKRD);
85 * For most restore operations, we clear the entire register and
86 * then set the bits we found during the save.
88 void restore_au1xxx_intctl(void)
90 au_writel(0xffffffff, IC0_MASKCLR); au_sync();
92 au_writel(0xffffffff, IC0_CFG0CLR); au_sync();
93 au_writel(sleep_intctl_config0[0], IC0_CFG0SET); au_sync();
94 au_writel(0xffffffff, IC0_CFG1CLR); au_sync();
95 au_writel(sleep_intctl_config1[0], IC0_CFG1SET); au_sync();
96 au_writel(0xffffffff, IC0_CFG2CLR); au_sync();
97 au_writel(sleep_intctl_config2[0], IC0_CFG2SET); au_sync();
98 au_writel(0xffffffff, IC0_SRCCLR); au_sync();
99 au_writel(sleep_intctl_src[0], IC0_SRCSET); au_sync();
100 au_writel(0xffffffff, IC0_ASSIGNCLR); au_sync();
101 au_writel(sleep_intctl_assign[0], IC0_ASSIGNSET); au_sync();
102 au_writel(0xffffffff, IC0_WAKECLR); au_sync();
103 au_writel(sleep_intctl_wake[0], IC0_WAKESET); au_sync();
104 au_writel(0xffffffff, IC0_RISINGCLR); au_sync();
105 au_writel(0xffffffff, IC0_FALLINGCLR); au_sync();
106 au_writel(0x00000000, IC0_TESTBIT); au_sync();
108 au_writel(0xffffffff, IC1_MASKCLR); au_sync();
110 au_writel(0xffffffff, IC1_CFG0CLR); au_sync();
111 au_writel(sleep_intctl_config0[1], IC1_CFG0SET); au_sync();
112 au_writel(0xffffffff, IC1_CFG1CLR); au_sync();
113 au_writel(sleep_intctl_config1[1], IC1_CFG1SET); au_sync();
114 au_writel(0xffffffff, IC1_CFG2CLR); au_sync();
115 au_writel(sleep_intctl_config2[1], IC1_CFG2SET); au_sync();
116 au_writel(0xffffffff, IC1_SRCCLR); au_sync();
117 au_writel(sleep_intctl_src[1], IC1_SRCSET); au_sync();
118 au_writel(0xffffffff, IC1_ASSIGNCLR); au_sync();
119 au_writel(sleep_intctl_assign[1], IC1_ASSIGNSET); au_sync();
120 au_writel(0xffffffff, IC1_WAKECLR); au_sync();
121 au_writel(sleep_intctl_wake[1], IC1_WAKESET); au_sync();
122 au_writel(0xffffffff, IC1_RISINGCLR); au_sync();
123 au_writel(0xffffffff, IC1_FALLINGCLR); au_sync();
124 au_writel(0x00000000, IC1_TESTBIT); au_sync();
126 au_writel(sleep_intctl_mask[1], IC1_MASKSET); au_sync();
128 au_writel(sleep_intctl_mask[0], IC0_MASKSET); au_sync();
130 #endif /* CONFIG_PM */
133 inline void local_enable_irq(unsigned int irq_nr)
135 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
138 au_writel(1 << (bit - 32), IC1_MASKSET);
139 au_writel(1 << (bit - 32), IC1_WAKESET);
141 au_writel(1 << bit, IC0_MASKSET);
142 au_writel(1 << bit, IC0_WAKESET);
148 inline void local_disable_irq(unsigned int irq_nr)
150 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
153 au_writel(1 << (bit - 32), IC1_MASKCLR);
154 au_writel(1 << (bit - 32), IC1_WAKECLR);
156 au_writel(1 << bit, IC0_MASKCLR);
157 au_writel(1 << bit, IC0_WAKECLR);
163 static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
165 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
168 au_writel(1 << (bit - 32), IC1_RISINGCLR);
169 au_writel(1 << (bit - 32), IC1_MASKCLR);
171 au_writel(1 << bit, IC0_RISINGCLR);
172 au_writel(1 << bit, IC0_MASKCLR);
178 static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
180 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
183 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
184 au_writel(1 << (bit - 32), IC1_MASKCLR);
186 au_writel(1 << bit, IC0_FALLINGCLR);
187 au_writel(1 << bit, IC0_MASKCLR);
193 static inline void mask_and_ack_either_edge_irq(unsigned int irq_nr)
195 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
198 * This may assume that we don't get interrupts from
199 * both edges at once, or if we do, that we don't care.
202 au_writel(1 << (bit - 32), IC1_FALLINGCLR);
203 au_writel(1 << (bit - 32), IC1_RISINGCLR);
204 au_writel(1 << (bit - 32), IC1_MASKCLR);
206 au_writel(1 << bit, IC0_FALLINGCLR);
207 au_writel(1 << bit, IC0_RISINGCLR);
208 au_writel(1 << bit, IC0_MASKCLR);
214 static inline void mask_and_ack_level_irq(unsigned int irq_nr)
217 local_disable_irq(irq_nr);
219 #if defined(CONFIG_MIPS_PB1000)
220 if (irq_nr == AU1000_GPIO_15) {
221 au_writel(0x8000, PB1000_MDR); /* ack int */
227 static void end_irq(unsigned int irq_nr)
229 if (!(irq_desc[irq_nr].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
230 local_enable_irq(irq_nr);
232 #if defined(CONFIG_MIPS_PB1000)
233 if (irq_nr == AU1000_GPIO_15) {
234 au_writel(0x4000, PB1000_MDR); /* enable int */
240 unsigned long save_local_and_disable(int controller)
243 unsigned long flags, mask;
245 spin_lock_irqsave(&irq_lock, flags);
247 mask = au_readl(IC1_MASKSET);
248 for (i = 32; i < 64; i++)
249 local_disable_irq(i);
251 mask = au_readl(IC0_MASKSET);
252 for (i = 0; i < 32; i++)
253 local_disable_irq(i);
255 spin_unlock_irqrestore(&irq_lock, flags);
260 void restore_local_and_enable(int controller, unsigned long mask)
263 unsigned long flags, new_mask;
265 spin_lock_irqsave(&irq_lock, flags);
266 for (i = 0; i < 32; i++) {
267 if (mask & (1 << i)) {
269 local_enable_irq(i + 32);
275 new_mask = au_readl(IC1_MASKSET);
277 new_mask = au_readl(IC0_MASKSET);
279 spin_unlock_irqrestore(&irq_lock, flags);
283 static struct irq_chip rise_edge_irq_type = {
284 .name = "Au1000 Rise Edge",
285 .ack = mask_and_ack_rise_edge_irq,
286 .mask = local_disable_irq,
287 .mask_ack = mask_and_ack_rise_edge_irq,
288 .unmask = local_enable_irq,
292 static struct irq_chip fall_edge_irq_type = {
293 .name = "Au1000 Fall Edge",
294 .ack = mask_and_ack_fall_edge_irq,
295 .mask = local_disable_irq,
296 .mask_ack = mask_and_ack_fall_edge_irq,
297 .unmask = local_enable_irq,
301 static struct irq_chip either_edge_irq_type = {
302 .name = "Au1000 Rise or Fall Edge",
303 .ack = mask_and_ack_either_edge_irq,
304 .mask = local_disable_irq,
305 .mask_ack = mask_and_ack_either_edge_irq,
306 .unmask = local_enable_irq,
310 static struct irq_chip level_irq_type = {
311 .name = "Au1000 Level",
312 .ack = mask_and_ack_level_irq,
313 .mask = local_disable_irq,
314 .mask_ack = mask_and_ack_level_irq,
315 .unmask = local_enable_irq,
319 static void __init setup_local_irq(unsigned int irq_nr, int type, int int_req)
321 unsigned int bit = irq_nr - AU1000_INTC0_INT_BASE;
323 if (irq_nr > AU1000_MAX_INTR)
326 /* Config2[n], Config1[n], Config0[n] */
329 case INTC_INT_RISE_EDGE: /* 0:0:1 */
330 au_writel(1 << (bit - 32), IC1_CFG2CLR);
331 au_writel(1 << (bit - 32), IC1_CFG1CLR);
332 au_writel(1 << (bit - 32), IC1_CFG0SET);
333 set_irq_chip(irq_nr, &rise_edge_irq_type);
335 case INTC_INT_FALL_EDGE: /* 0:1:0 */
336 au_writel(1 << (bit - 32), IC1_CFG2CLR);
337 au_writel(1 << (bit - 32), IC1_CFG1SET);
338 au_writel(1 << (bit - 32), IC1_CFG0CLR);
339 set_irq_chip(irq_nr, &fall_edge_irq_type);
341 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
342 au_writel(1 << (bit - 32), IC1_CFG2CLR);
343 au_writel(1 << (bit - 32), IC1_CFG1SET);
344 au_writel(1 << (bit - 32), IC1_CFG0SET);
345 set_irq_chip(irq_nr, &either_edge_irq_type);
347 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
348 au_writel(1 << (bit - 32), IC1_CFG2SET);
349 au_writel(1 << (bit - 32), IC1_CFG1CLR);
350 au_writel(1 << (bit - 32), IC1_CFG0SET);
351 set_irq_chip(irq_nr, &level_irq_type);
353 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
354 au_writel(1 << (bit - 32), IC1_CFG2SET);
355 au_writel(1 << (bit - 32), IC1_CFG1SET);
356 au_writel(1 << (bit - 32), IC1_CFG0CLR);
357 set_irq_chip(irq_nr, &level_irq_type);
359 case INTC_INT_DISABLED: /* 0:0:0 */
360 au_writel(1 << (bit - 32), IC1_CFG0CLR);
361 au_writel(1 << (bit - 32), IC1_CFG1CLR);
362 au_writel(1 << (bit - 32), IC1_CFG2CLR);
364 default: /* disable the interrupt */
365 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
367 au_writel(1 << (bit - 32), IC1_CFG0CLR);
368 au_writel(1 << (bit - 32), IC1_CFG1CLR);
369 au_writel(1 << (bit - 32), IC1_CFG2CLR);
372 if (int_req) /* assign to interrupt request 1 */
373 au_writel(1 << (bit - 32), IC1_ASSIGNCLR);
374 else /* assign to interrupt request 0 */
375 au_writel(1 << (bit - 32), IC1_ASSIGNSET);
376 au_writel(1 << (bit - 32), IC1_SRCSET);
377 au_writel(1 << (bit - 32), IC1_MASKCLR);
378 au_writel(1 << (bit - 32), IC1_WAKECLR);
381 case INTC_INT_RISE_EDGE: /* 0:0:1 */
382 au_writel(1 << bit, IC0_CFG2CLR);
383 au_writel(1 << bit, IC0_CFG1CLR);
384 au_writel(1 << bit, IC0_CFG0SET);
385 set_irq_chip(irq_nr, &rise_edge_irq_type);
387 case INTC_INT_FALL_EDGE: /* 0:1:0 */
388 au_writel(1 << bit, IC0_CFG2CLR);
389 au_writel(1 << bit, IC0_CFG1SET);
390 au_writel(1 << bit, IC0_CFG0CLR);
391 set_irq_chip(irq_nr, &fall_edge_irq_type);
393 case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
394 au_writel(1 << bit, IC0_CFG2CLR);
395 au_writel(1 << bit, IC0_CFG1SET);
396 au_writel(1 << bit, IC0_CFG0SET);
397 set_irq_chip(irq_nr, &either_edge_irq_type);
399 case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
400 au_writel(1 << bit, IC0_CFG2SET);
401 au_writel(1 << bit, IC0_CFG1CLR);
402 au_writel(1 << bit, IC0_CFG0SET);
403 set_irq_chip(irq_nr, &level_irq_type);
405 case INTC_INT_LOW_LEVEL: /* 1:1:0 */
406 au_writel(1 << bit, IC0_CFG2SET);
407 au_writel(1 << bit, IC0_CFG1SET);
408 au_writel(1 << bit, IC0_CFG0CLR);
409 set_irq_chip(irq_nr, &level_irq_type);
411 case INTC_INT_DISABLED: /* 0:0:0 */
412 au_writel(1 << bit, IC0_CFG0CLR);
413 au_writel(1 << bit, IC0_CFG1CLR);
414 au_writel(1 << bit, IC0_CFG2CLR);
416 default: /* disable the interrupt */
417 printk(KERN_WARNING "unexpected int type %d (irq %d)\n",
419 au_writel(1 << bit, IC0_CFG0CLR);
420 au_writel(1 << bit, IC0_CFG1CLR);
421 au_writel(1 << bit, IC0_CFG2CLR);
424 if (int_req) /* assign to interrupt request 1 */
425 au_writel(1 << bit, IC0_ASSIGNCLR);
426 else /* assign to interrupt request 0 */
427 au_writel(1 << bit, IC0_ASSIGNSET);
428 au_writel(1 << bit, IC0_SRCSET);
429 au_writel(1 << bit, IC0_MASKCLR);
430 au_writel(1 << bit, IC0_WAKECLR);
436 * Interrupts are nested. Even if an interrupt handler is registered
437 * as "fast", we might get another interrupt before we return from
438 * intcX_reqX_irqdispatch().
441 static void intc0_req0_irqdispatch(void)
443 static unsigned long intc0_req0;
446 intc0_req0 |= au_readl(IC0_REQ0INT);
451 #ifdef AU1000_USB_DEV_REQ_INT
453 * Because of the tight timing of SETUP token to reply
454 * transactions, the USB devices-side packet complete
455 * interrupt needs the highest priority.
457 if ((intc0_req0 & (1 << AU1000_USB_DEV_REQ_INT))) {
458 intc0_req0 &= ~(1 << AU1000_USB_DEV_REQ_INT);
459 do_IRQ(AU1000_USB_DEV_REQ_INT);
463 bit = __ffs(intc0_req0);
464 intc0_req0 &= ~(1 << bit);
465 do_IRQ(AU1000_INTC0_INT_BASE + bit);
469 static void intc0_req1_irqdispatch(void)
471 static unsigned long intc0_req1;
474 intc0_req1 |= au_readl(IC0_REQ1INT);
479 bit = __ffs(intc0_req1);
480 intc0_req1 &= ~(1 << bit);
481 do_IRQ(AU1000_INTC0_INT_BASE + bit);
486 * Interrupt Controller 1:
489 static void intc1_req0_irqdispatch(void)
491 static unsigned long intc1_req0;
494 intc1_req0 |= au_readl(IC1_REQ0INT);
499 bit = __ffs(intc1_req0);
500 intc1_req0 &= ~(1 << bit);
501 do_IRQ(AU1000_INTC1_INT_BASE + bit);
505 static void intc1_req1_irqdispatch(void)
507 static unsigned long intc1_req1;
510 intc1_req1 |= au_readl(IC1_REQ1INT);
515 bit = __ffs(intc1_req1);
516 intc1_req1 &= ~(1 << bit);
517 do_IRQ(AU1000_INTC1_INT_BASE + bit);
520 asmlinkage void plat_irq_dispatch(void)
522 unsigned int pending = read_c0_status() & read_c0_cause();
524 if (pending & CAUSEF_IP7)
525 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
526 else if (pending & CAUSEF_IP2)
527 intc0_req0_irqdispatch();
528 else if (pending & CAUSEF_IP3)
529 intc0_req1_irqdispatch();
530 else if (pending & CAUSEF_IP4)
531 intc1_req0_irqdispatch();
532 else if (pending & CAUSEF_IP5)
533 intc1_req1_irqdispatch();
535 spurious_interrupt();
538 void __init arch_init_irq(void)
541 struct au1xxx_irqmap *imp;
542 extern struct au1xxx_irqmap au1xxx_irq_map[];
543 extern struct au1xxx_irqmap au1xxx_ic0_map[];
544 extern int au1xxx_nr_irqs;
545 extern int au1xxx_ic0_nr_irqs;
548 * Initialize interrupt controllers to a safe state.
550 au_writel(0xffffffff, IC0_CFG0CLR);
551 au_writel(0xffffffff, IC0_CFG1CLR);
552 au_writel(0xffffffff, IC0_CFG2CLR);
553 au_writel(0xffffffff, IC0_MASKCLR);
554 au_writel(0xffffffff, IC0_ASSIGNSET);
555 au_writel(0xffffffff, IC0_WAKECLR);
556 au_writel(0xffffffff, IC0_SRCSET);
557 au_writel(0xffffffff, IC0_FALLINGCLR);
558 au_writel(0xffffffff, IC0_RISINGCLR);
559 au_writel(0x00000000, IC0_TESTBIT);
561 au_writel(0xffffffff, IC1_CFG0CLR);
562 au_writel(0xffffffff, IC1_CFG1CLR);
563 au_writel(0xffffffff, IC1_CFG2CLR);
564 au_writel(0xffffffff, IC1_MASKCLR);
565 au_writel(0xffffffff, IC1_ASSIGNSET);
566 au_writel(0xffffffff, IC1_WAKECLR);
567 au_writel(0xffffffff, IC1_SRCSET);
568 au_writel(0xffffffff, IC1_FALLINGCLR);
569 au_writel(0xffffffff, IC1_RISINGCLR);
570 au_writel(0x00000000, IC1_TESTBIT);
575 * Initialize IC0, which is fixed per processor.
577 imp = au1xxx_ic0_map;
578 for (i = 0; i < au1xxx_ic0_nr_irqs; i++) {
579 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
584 * Now set up the irq mapping for the board.
586 imp = au1xxx_irq_map;
587 for (i = 0; i < au1xxx_nr_irqs; i++) {
588 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
592 set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4);
594 /* Board specific IRQ initialization.