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Linux 2.6.31.8
[linux/fpc-iii.git] / arch / arm / plat-s3c24xx / irq.c
blob958737775ad292f3bb377027f7318a29e654cde6
1 /* linux/arch/arm/plat-s3c24xx/irq.c
2 *
3 * Copyright (c) 2003,2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include <linux/init.h>
22 #include <linux/module.h>
23 #include <linux/interrupt.h>
24 #include <linux/ioport.h>
25 #include <linux/sysdev.h>
26
27 #include <asm/irq.h>
28 #include <asm/mach/irq.h>
29
30 #include <plat/regs-irqtype.h>
31
32 #include <plat/cpu.h>
33 #include <plat/pm.h>
34 #include <plat/irq.h>
35
36 static void
37 s3c_irq_mask(unsigned int irqno)
38 {
39 unsigned long mask;
40
41 irqno -= IRQ_EINT0;
42
43 mask = __raw_readl(S3C2410_INTMSK);
44 mask |= 1UL << irqno;
45 __raw_writel(mask, S3C2410_INTMSK);
46 }
47
48 static inline void
49 s3c_irq_ack(unsigned int irqno)
50 {
51 unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
52
53 __raw_writel(bitval, S3C2410_SRCPND);
54 __raw_writel(bitval, S3C2410_INTPND);
55 }
56
57 static inline void
58 s3c_irq_maskack(unsigned int irqno)
59 {
60 unsigned long bitval = 1UL << (irqno - IRQ_EINT0);
61 unsigned long mask;
62
63 mask = __raw_readl(S3C2410_INTMSK);
64 __raw_writel(mask|bitval, S3C2410_INTMSK);
65
66 __raw_writel(bitval, S3C2410_SRCPND);
67 __raw_writel(bitval, S3C2410_INTPND);
68 }
69
70
71 static void
72 s3c_irq_unmask(unsigned int irqno)
73 {
74 unsigned long mask;
75
76 if (irqno != IRQ_TIMER4 && irqno != IRQ_EINT8t23)
77 irqdbf2("s3c_irq_unmask %d\n", irqno);
78
79 irqno -= IRQ_EINT0;
80
81 mask = __raw_readl(S3C2410_INTMSK);
82 mask &= ~(1UL << irqno);
83 __raw_writel(mask, S3C2410_INTMSK);
84 }
85
86 struct irq_chip s3c_irq_level_chip = {
87 .name = "s3c-level",
88 .ack = s3c_irq_maskack,
89 .mask = s3c_irq_mask,
90 .unmask = s3c_irq_unmask,
91 .set_wake = s3c_irq_wake
92 };
93
94 struct irq_chip s3c_irq_chip = {
95 .name = "s3c",
96 .ack = s3c_irq_ack,
97 .mask = s3c_irq_mask,
98 .unmask = s3c_irq_unmask,
99 .set_wake = s3c_irq_wake
100 };
101
102 static void
103 s3c_irqext_mask(unsigned int irqno)
104 {
105 unsigned long mask;
106
107 irqno -= EXTINT_OFF;
108
109 mask = __raw_readl(S3C24XX_EINTMASK);
110 mask |= ( 1UL << irqno);
111 __raw_writel(mask, S3C24XX_EINTMASK);
112 }
113
114 static void
115 s3c_irqext_ack(unsigned int irqno)
116 {
117 unsigned long req;
118 unsigned long bit;
119 unsigned long mask;
120
121 bit = 1UL << (irqno - EXTINT_OFF);
122
123 mask = __raw_readl(S3C24XX_EINTMASK);
124
125 __raw_writel(bit, S3C24XX_EINTPEND);
126
127 req = __raw_readl(S3C24XX_EINTPEND);
128 req &= ~mask;
129
130 /* not sure if we should be acking the parent irq... */
131
132 if (irqno <= IRQ_EINT7 ) {
133 if ((req & 0xf0) == 0)
134 s3c_irq_ack(IRQ_EINT4t7);
135 } else {
136 if ((req >> 8) == 0)
137 s3c_irq_ack(IRQ_EINT8t23);
138 }
139 }
140
141 static void
142 s3c_irqext_unmask(unsigned int irqno)
143 {
144 unsigned long mask;
145
146 irqno -= EXTINT_OFF;
147
148 mask = __raw_readl(S3C24XX_EINTMASK);
149 mask &= ~( 1UL << irqno);
150 __raw_writel(mask, S3C24XX_EINTMASK);
151 }
152
153 int
154 s3c_irqext_type(unsigned int irq, unsigned int type)
155 {
156 void __iomem *extint_reg;
157 void __iomem *gpcon_reg;
158 unsigned long gpcon_offset, extint_offset;
159 unsigned long newvalue = 0, value;
160
161 if ((irq >= IRQ_EINT0) && (irq <= IRQ_EINT3))
162 {
163 gpcon_reg = S3C2410_GPFCON;
164 extint_reg = S3C24XX_EXTINT0;
165 gpcon_offset = (irq - IRQ_EINT0) * 2;
166 extint_offset = (irq - IRQ_EINT0) * 4;
167 }
168 else if ((irq >= IRQ_EINT4) && (irq <= IRQ_EINT7))
169 {
170 gpcon_reg = S3C2410_GPFCON;
171 extint_reg = S3C24XX_EXTINT0;
172 gpcon_offset = (irq - (EXTINT_OFF)) * 2;
173 extint_offset = (irq - (EXTINT_OFF)) * 4;
174 }
175 else if ((irq >= IRQ_EINT8) && (irq <= IRQ_EINT15))
176 {
177 gpcon_reg = S3C2410_GPGCON;
178 extint_reg = S3C24XX_EXTINT1;
179 gpcon_offset = (irq - IRQ_EINT8) * 2;
180 extint_offset = (irq - IRQ_EINT8) * 4;
181 }
182 else if ((irq >= IRQ_EINT16) && (irq <= IRQ_EINT23))
183 {
184 gpcon_reg = S3C2410_GPGCON;
185 extint_reg = S3C24XX_EXTINT2;
186 gpcon_offset = (irq - IRQ_EINT8) * 2;
187 extint_offset = (irq - IRQ_EINT16) * 4;
188 } else
189 return -1;
190
191 /* Set the GPIO to external interrupt mode */
192 value = __raw_readl(gpcon_reg);
193 value = (value & ~(3 << gpcon_offset)) | (0x02 << gpcon_offset);
194 __raw_writel(value, gpcon_reg);
195
196 /* Set the external interrupt to pointed trigger type */
197 switch (type)
198 {
199 case IRQ_TYPE_NONE:
200 printk(KERN_WARNING "No edge setting!\n");
201 break;
202
203 case IRQ_TYPE_EDGE_RISING:
204 newvalue = S3C2410_EXTINT_RISEEDGE;
205 break;
206
207 case IRQ_TYPE_EDGE_FALLING:
208 newvalue = S3C2410_EXTINT_FALLEDGE;
209 break;
210
211 case IRQ_TYPE_EDGE_BOTH:
212 newvalue = S3C2410_EXTINT_BOTHEDGE;
213 break;
214
215 case IRQ_TYPE_LEVEL_LOW:
216 newvalue = S3C2410_EXTINT_LOWLEV;
217 break;
218
219 case IRQ_TYPE_LEVEL_HIGH:
220 newvalue = S3C2410_EXTINT_HILEV;
221 break;
222
223 default:
224 printk(KERN_ERR "No such irq type %d", type);
225 return -1;
226 }
227
228 value = __raw_readl(extint_reg);
229 value = (value & ~(7 << extint_offset)) | (newvalue << extint_offset);
230 __raw_writel(value, extint_reg);
231
232 return 0;
233 }
234
235 static struct irq_chip s3c_irqext_chip = {
236 .name = "s3c-ext",
237 .mask = s3c_irqext_mask,
238 .unmask = s3c_irqext_unmask,
239 .ack = s3c_irqext_ack,
240 .set_type = s3c_irqext_type,
241 .set_wake = s3c_irqext_wake
242 };
243
244 static struct irq_chip s3c_irq_eint0t4 = {
245 .name = "s3c-ext0",
246 .ack = s3c_irq_ack,
247 .mask = s3c_irq_mask,
248 .unmask = s3c_irq_unmask,
249 .set_wake = s3c_irq_wake,
250 .set_type = s3c_irqext_type,
251 };
252
253 /* mask values for the parent registers for each of the interrupt types */
254
255 #define INTMSK_UART0 (1UL << (IRQ_UART0 - IRQ_EINT0))
256 #define INTMSK_UART1 (1UL << (IRQ_UART1 - IRQ_EINT0))
257 #define INTMSK_UART2 (1UL << (IRQ_UART2 - IRQ_EINT0))
258 #define INTMSK_ADCPARENT (1UL << (IRQ_ADCPARENT - IRQ_EINT0))
259
260
261 /* UART0 */
262
263 static void
264 s3c_irq_uart0_mask(unsigned int irqno)
265 {
266 s3c_irqsub_mask(irqno, INTMSK_UART0, 7);
267 }
268
269 static void
270 s3c_irq_uart0_unmask(unsigned int irqno)
271 {
272 s3c_irqsub_unmask(irqno, INTMSK_UART0);
273 }
274
275 static void
276 s3c_irq_uart0_ack(unsigned int irqno)
277 {
278 s3c_irqsub_maskack(irqno, INTMSK_UART0, 7);
279 }
280
281 static struct irq_chip s3c_irq_uart0 = {
282 .name = "s3c-uart0",
283 .mask = s3c_irq_uart0_mask,
284 .unmask = s3c_irq_uart0_unmask,
285 .ack = s3c_irq_uart0_ack,
286 };
287
288 /* UART1 */
289
290 static void
291 s3c_irq_uart1_mask(unsigned int irqno)
292 {
293 s3c_irqsub_mask(irqno, INTMSK_UART1, 7 << 3);
294 }
295
296 static void
297 s3c_irq_uart1_unmask(unsigned int irqno)
298 {
299 s3c_irqsub_unmask(irqno, INTMSK_UART1);
300 }
301
302 static void
303 s3c_irq_uart1_ack(unsigned int irqno)
304 {
305 s3c_irqsub_maskack(irqno, INTMSK_UART1, 7 << 3);
306 }
307
308 static struct irq_chip s3c_irq_uart1 = {
309 .name = "s3c-uart1",
310 .mask = s3c_irq_uart1_mask,
311 .unmask = s3c_irq_uart1_unmask,
312 .ack = s3c_irq_uart1_ack,
313 };
314
315 /* UART2 */
316
317 static void
318 s3c_irq_uart2_mask(unsigned int irqno)
319 {
320 s3c_irqsub_mask(irqno, INTMSK_UART2, 7 << 6);
321 }
322
323 static void
324 s3c_irq_uart2_unmask(unsigned int irqno)
325 {
326 s3c_irqsub_unmask(irqno, INTMSK_UART2);
327 }
328
329 static void
330 s3c_irq_uart2_ack(unsigned int irqno)
331 {
332 s3c_irqsub_maskack(irqno, INTMSK_UART2, 7 << 6);
333 }
334
335 static struct irq_chip s3c_irq_uart2 = {
336 .name = "s3c-uart2",
337 .mask = s3c_irq_uart2_mask,
338 .unmask = s3c_irq_uart2_unmask,
339 .ack = s3c_irq_uart2_ack,
340 };
341
342 /* ADC and Touchscreen */
343
344 static void
345 s3c_irq_adc_mask(unsigned int irqno)
346 {
347 s3c_irqsub_mask(irqno, INTMSK_ADCPARENT, 3 << 9);
348 }
349
350 static void
351 s3c_irq_adc_unmask(unsigned int irqno)
352 {
353 s3c_irqsub_unmask(irqno, INTMSK_ADCPARENT);
354 }
355
356 static void
357 s3c_irq_adc_ack(unsigned int irqno)
358 {
359 s3c_irqsub_ack(irqno, INTMSK_ADCPARENT, 3 << 9);
360 }
361
362 static struct irq_chip s3c_irq_adc = {
363 .name = "s3c-adc",
364 .mask = s3c_irq_adc_mask,
365 .unmask = s3c_irq_adc_unmask,
366 .ack = s3c_irq_adc_ack,
367 };
368
369 /* irq demux for adc */
370 static void s3c_irq_demux_adc(unsigned int irq,
371 struct irq_desc *desc)
372 {
373 unsigned int subsrc, submsk;
374 unsigned int offset = 9;
375
376 /* read the current pending interrupts, and the mask
377 * for what it is available */
378
379 subsrc = __raw_readl(S3C2410_SUBSRCPND);
380 submsk = __raw_readl(S3C2410_INTSUBMSK);
381
382 subsrc &= ~submsk;
383 subsrc >>= offset;
384 subsrc &= 3;
385
386 if (subsrc != 0) {
387 if (subsrc & 1) {
388 generic_handle_irq(IRQ_TC);
389 }
390 if (subsrc & 2) {
391 generic_handle_irq(IRQ_ADC);
392 }
393 }
394 }
395
396 static void s3c_irq_demux_uart(unsigned int start)
397 {
398 unsigned int subsrc, submsk;
399 unsigned int offset = start - IRQ_S3CUART_RX0;
400
401 /* read the current pending interrupts, and the mask
402 * for what it is available */
403
404 subsrc = __raw_readl(S3C2410_SUBSRCPND);
405 submsk = __raw_readl(S3C2410_INTSUBMSK);
406
407 irqdbf2("s3c_irq_demux_uart: start=%d (%d), subsrc=0x%08x,0x%08x\n",
408 start, offset, subsrc, submsk);
409
410 subsrc &= ~submsk;
411 subsrc >>= offset;
412 subsrc &= 7;
413
414 if (subsrc != 0) {
415 if (subsrc & 1)
416 generic_handle_irq(start);
417
418 if (subsrc & 2)
419 generic_handle_irq(start+1);
420
421 if (subsrc & 4)
422 generic_handle_irq(start+2);
423 }
424 }
425
426 /* uart demux entry points */
427
428 static void
429 s3c_irq_demux_uart0(unsigned int irq,
430 struct irq_desc *desc)
431 {
432 irq = irq;
433 s3c_irq_demux_uart(IRQ_S3CUART_RX0);
434 }
435
436 static void
437 s3c_irq_demux_uart1(unsigned int irq,
438 struct irq_desc *desc)
439 {
440 irq = irq;
441 s3c_irq_demux_uart(IRQ_S3CUART_RX1);
442 }
443
444 static void
445 s3c_irq_demux_uart2(unsigned int irq,
446 struct irq_desc *desc)
447 {
448 irq = irq;
449 s3c_irq_demux_uart(IRQ_S3CUART_RX2);
450 }
451
452 static void
453 s3c_irq_demux_extint8(unsigned int irq,
454 struct irq_desc *desc)
455 {
456 unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
457 unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
458
459 eintpnd &= ~eintmsk;
460 eintpnd &= ~0xff; /* ignore lower irqs */
461
462 /* we may as well handle all the pending IRQs here */
463
464 while (eintpnd) {
465 irq = __ffs(eintpnd);
466 eintpnd &= ~(1<<irq);
467
468 irq += (IRQ_EINT4 - 4);
469 generic_handle_irq(irq);
470 }
471
472 }
473
474 static void
475 s3c_irq_demux_extint4t7(unsigned int irq,
476 struct irq_desc *desc)
477 {
478 unsigned long eintpnd = __raw_readl(S3C24XX_EINTPEND);
479 unsigned long eintmsk = __raw_readl(S3C24XX_EINTMASK);
480
481 eintpnd &= ~eintmsk;
482 eintpnd &= 0xff; /* only lower irqs */
483
484 /* we may as well handle all the pending IRQs here */
485
486 while (eintpnd) {
487 irq = __ffs(eintpnd);
488 eintpnd &= ~(1<<irq);
489
490 irq += (IRQ_EINT4 - 4);
491
492 generic_handle_irq(irq);
493 }
494 }
495
496 /* s3c24xx_init_irq
497 *
498 * Initialise S3C2410 IRQ system
499 */
500
501 void __init s3c24xx_init_irq(void)
502 {
503 unsigned long pend;
504 unsigned long last;
505 int irqno;
506 int i;
507
508 irqdbf("s3c2410_init_irq: clearing interrupt status flags\n");
509
510 /* first, clear all interrupts pending... */
511
512 last = 0;
513 for (i = 0; i < 4; i++) {
514 pend = __raw_readl(S3C24XX_EINTPEND);
515
516 if (pend == 0 || pend == last)
517 break;
518
519 __raw_writel(pend, S3C24XX_EINTPEND);
520 printk("irq: clearing pending ext status %08x\n", (int)pend);
521 last = pend;
522 }
523
524 last = 0;
525 for (i = 0; i < 4; i++) {
526 pend = __raw_readl(S3C2410_INTPND);
527
528 if (pend == 0 || pend == last)
529 break;
530
531 __raw_writel(pend, S3C2410_SRCPND);
532 __raw_writel(pend, S3C2410_INTPND);
533 printk("irq: clearing pending status %08x\n", (int)pend);
534 last = pend;
535 }
536
537 last = 0;
538 for (i = 0; i < 4; i++) {
539 pend = __raw_readl(S3C2410_SUBSRCPND);
540
541 if (pend == 0 || pend == last)
542 break;
543
544 printk("irq: clearing subpending status %08x\n", (int)pend);
545 __raw_writel(pend, S3C2410_SUBSRCPND);
546 last = pend;
547 }
548
549 /* register the main interrupts */
550
551 irqdbf("s3c2410_init_irq: registering s3c2410 interrupt handlers\n");
552
553 for (irqno = IRQ_EINT4t7; irqno <= IRQ_ADCPARENT; irqno++) {
554 /* set all the s3c2410 internal irqs */
555
556 switch (irqno) {
557 /* deal with the special IRQs (cascaded) */
558
559 case IRQ_EINT4t7:
560 case IRQ_EINT8t23:
561 case IRQ_UART0:
562 case IRQ_UART1:
563 case IRQ_UART2:
564 case IRQ_ADCPARENT:
565 set_irq_chip(irqno, &s3c_irq_level_chip);
566 set_irq_handler(irqno, handle_level_irq);
567 break;
568
569 case IRQ_RESERVED6:
570 case IRQ_RESERVED24:
571 /* no IRQ here */
572 break;
573
574 default:
575 //irqdbf("registering irq %d (s3c irq)\n", irqno);
576 set_irq_chip(irqno, &s3c_irq_chip);
577 set_irq_handler(irqno, handle_edge_irq);
578 set_irq_flags(irqno, IRQF_VALID);
579 }
580 }
581
582 /* setup the cascade irq handlers */
583
584 set_irq_chained_handler(IRQ_EINT4t7, s3c_irq_demux_extint4t7);
585 set_irq_chained_handler(IRQ_EINT8t23, s3c_irq_demux_extint8);
586
587 set_irq_chained_handler(IRQ_UART0, s3c_irq_demux_uart0);
588 set_irq_chained_handler(IRQ_UART1, s3c_irq_demux_uart1);
589 set_irq_chained_handler(IRQ_UART2, s3c_irq_demux_uart2);
590 set_irq_chained_handler(IRQ_ADCPARENT, s3c_irq_demux_adc);
591
592 /* external interrupts */
593
594 for (irqno = IRQ_EINT0; irqno <= IRQ_EINT3; irqno++) {
595 irqdbf("registering irq %d (ext int)\n", irqno);
596 set_irq_chip(irqno, &s3c_irq_eint0t4);
597 set_irq_handler(irqno, handle_edge_irq);
598 set_irq_flags(irqno, IRQF_VALID);
599 }
600
601 for (irqno = IRQ_EINT4; irqno <= IRQ_EINT23; irqno++) {
602 irqdbf("registering irq %d (extended s3c irq)\n", irqno);
603 set_irq_chip(irqno, &s3c_irqext_chip);
604 set_irq_handler(irqno, handle_edge_irq);
605 set_irq_flags(irqno, IRQF_VALID);
606 }
607
608 /* register the uart interrupts */
609
610 irqdbf("s3c2410: registering external interrupts\n");
611
612 for (irqno = IRQ_S3CUART_RX0; irqno <= IRQ_S3CUART_ERR0; irqno++) {
613 irqdbf("registering irq %d (s3c uart0 irq)\n", irqno);
614 set_irq_chip(irqno, &s3c_irq_uart0);
615 set_irq_handler(irqno, handle_level_irq);
616 set_irq_flags(irqno, IRQF_VALID);
617 }
618
619 for (irqno = IRQ_S3CUART_RX1; irqno <= IRQ_S3CUART_ERR1; irqno++) {
620 irqdbf("registering irq %d (s3c uart1 irq)\n", irqno);
621 set_irq_chip(irqno, &s3c_irq_uart1);
622 set_irq_handler(irqno, handle_level_irq);
623 set_irq_flags(irqno, IRQF_VALID);
624 }
625
626 for (irqno = IRQ_S3CUART_RX2; irqno <= IRQ_S3CUART_ERR2; irqno++) {
627 irqdbf("registering irq %d (s3c uart2 irq)\n", irqno);
628 set_irq_chip(irqno, &s3c_irq_uart2);
629 set_irq_handler(irqno, handle_level_irq);
630 set_irq_flags(irqno, IRQF_VALID);
631 }
632
633 for (irqno = IRQ_TC; irqno <= IRQ_ADC; irqno++) {
634 irqdbf("registering irq %d (s3c adc irq)\n", irqno);
635 set_irq_chip(irqno, &s3c_irq_adc);
636 set_irq_handler(irqno, handle_edge_irq);
637 set_irq_flags(irqno, IRQF_VALID);
638 }
639
640 irqdbf("s3c2410: registered interrupt handlers\n");
641 }
Linux with added FPC-III support