Btrfs: handle bio_add_page failure gracefully in scrub
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / twl4030-irq.c
blob8a7ee3139b86fda3bded6748e572893d37b577fb
1 /*
2 * twl4030-irq.c - TWL4030/TPS659x0 irq support
4 * Copyright (C) 2005-2006 Texas Instruments, Inc.
6 * Modifications to defer interrupt handling to a kernel thread:
7 * Copyright (C) 2006 MontaVista Software, Inc.
9 * Based on tlv320aic23.c:
10 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
12 * Code cleanup and modifications to IRQ handler.
13 * by syed khasim <x0khasim@ti.com>
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <linux/init.h>
31 #include <linux/interrupt.h>
32 #include <linux/irq.h>
33 #include <linux/kthread.h>
34 #include <linux/slab.h>
36 #include <linux/i2c/twl.h>
38 #include "twl-core.h"
41 * TWL4030 IRQ handling has two stages in hardware, and thus in software.
42 * The Primary Interrupt Handler (PIH) stage exposes status bits saying
43 * which Secondary Interrupt Handler (SIH) stage is raising an interrupt.
44 * SIH modules are more traditional IRQ components, which support per-IRQ
45 * enable/disable and trigger controls; they do most of the work.
47 * These chips are designed to support IRQ handling from two different
48 * I2C masters. Each has a dedicated IRQ line, and dedicated IRQ status
49 * and mask registers in the PIH and SIH modules.
51 * We set up IRQs starting at a platform-specified base, always starting
52 * with PIH and the SIH for PWR_INT and then usually adding GPIO:
53 * base + 0 .. base + 7 PIH
54 * base + 8 .. base + 15 SIH for PWR_INT
55 * base + 16 .. base + 33 SIH for GPIO
58 /* PIH register offsets */
59 #define REG_PIH_ISR_P1 0x01
60 #define REG_PIH_ISR_P2 0x02
61 #define REG_PIH_SIR 0x03 /* for testing */
64 /* Linux could (eventually) use either IRQ line */
65 static int irq_line;
67 struct sih {
68 char name[8];
69 u8 module; /* module id */
70 u8 control_offset; /* for SIH_CTRL */
71 bool set_cor;
73 u8 bits; /* valid in isr/imr */
74 u8 bytes_ixr; /* bytelen of ISR/IMR/SIR */
76 u8 edr_offset;
77 u8 bytes_edr; /* bytelen of EDR */
79 u8 irq_lines; /* number of supported irq lines */
81 /* SIR ignored -- set interrupt, for testing only */
82 struct sih_irq_data {
83 u8 isr_offset;
84 u8 imr_offset;
85 } mask[2];
86 /* + 2 bytes padding */
89 static const struct sih *sih_modules;
90 static int nr_sih_modules;
92 #define SIH_INITIALIZER(modname, nbits) \
93 .module = TWL4030_MODULE_ ## modname, \
94 .control_offset = TWL4030_ ## modname ## _SIH_CTRL, \
95 .bits = nbits, \
96 .bytes_ixr = DIV_ROUND_UP(nbits, 8), \
97 .edr_offset = TWL4030_ ## modname ## _EDR, \
98 .bytes_edr = DIV_ROUND_UP((2*(nbits)), 8), \
99 .irq_lines = 2, \
100 .mask = { { \
101 .isr_offset = TWL4030_ ## modname ## _ISR1, \
102 .imr_offset = TWL4030_ ## modname ## _IMR1, \
103 }, \
105 .isr_offset = TWL4030_ ## modname ## _ISR2, \
106 .imr_offset = TWL4030_ ## modname ## _IMR2, \
107 }, },
109 /* register naming policies are inconsistent ... */
110 #define TWL4030_INT_PWR_EDR TWL4030_INT_PWR_EDR1
111 #define TWL4030_MODULE_KEYPAD_KEYP TWL4030_MODULE_KEYPAD
112 #define TWL4030_MODULE_INT_PWR TWL4030_MODULE_INT
115 /* Order in this table matches order in PIH_ISR. That is,
116 * BIT(n) in PIH_ISR is sih_modules[n].
118 /* sih_modules_twl4030 is used both in twl4030 and twl5030 */
119 static const struct sih sih_modules_twl4030[6] = {
120 [0] = {
121 .name = "gpio",
122 .module = TWL4030_MODULE_GPIO,
123 .control_offset = REG_GPIO_SIH_CTRL,
124 .set_cor = true,
125 .bits = TWL4030_GPIO_MAX,
126 .bytes_ixr = 3,
127 /* Note: *all* of these IRQs default to no-trigger */
128 .edr_offset = REG_GPIO_EDR1,
129 .bytes_edr = 5,
130 .irq_lines = 2,
131 .mask = { {
132 .isr_offset = REG_GPIO_ISR1A,
133 .imr_offset = REG_GPIO_IMR1A,
134 }, {
135 .isr_offset = REG_GPIO_ISR1B,
136 .imr_offset = REG_GPIO_IMR1B,
137 }, },
139 [1] = {
140 .name = "keypad",
141 .set_cor = true,
142 SIH_INITIALIZER(KEYPAD_KEYP, 4)
144 [2] = {
145 .name = "bci",
146 .module = TWL4030_MODULE_INTERRUPTS,
147 .control_offset = TWL4030_INTERRUPTS_BCISIHCTRL,
148 .set_cor = true,
149 .bits = 12,
150 .bytes_ixr = 2,
151 .edr_offset = TWL4030_INTERRUPTS_BCIEDR1,
152 /* Note: most of these IRQs default to no-trigger */
153 .bytes_edr = 3,
154 .irq_lines = 2,
155 .mask = { {
156 .isr_offset = TWL4030_INTERRUPTS_BCIISR1A,
157 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1A,
158 }, {
159 .isr_offset = TWL4030_INTERRUPTS_BCIISR1B,
160 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1B,
161 }, },
163 [3] = {
164 .name = "madc",
165 SIH_INITIALIZER(MADC, 4)
167 [4] = {
168 /* USB doesn't use the same SIH organization */
169 .name = "usb",
171 [5] = {
172 .name = "power",
173 .set_cor = true,
174 SIH_INITIALIZER(INT_PWR, 8)
176 /* there are no SIH modules #6 or #7 ... */
179 static const struct sih sih_modules_twl5031[8] = {
180 [0] = {
181 .name = "gpio",
182 .module = TWL4030_MODULE_GPIO,
183 .control_offset = REG_GPIO_SIH_CTRL,
184 .set_cor = true,
185 .bits = TWL4030_GPIO_MAX,
186 .bytes_ixr = 3,
187 /* Note: *all* of these IRQs default to no-trigger */
188 .edr_offset = REG_GPIO_EDR1,
189 .bytes_edr = 5,
190 .irq_lines = 2,
191 .mask = { {
192 .isr_offset = REG_GPIO_ISR1A,
193 .imr_offset = REG_GPIO_IMR1A,
194 }, {
195 .isr_offset = REG_GPIO_ISR1B,
196 .imr_offset = REG_GPIO_IMR1B,
197 }, },
199 [1] = {
200 .name = "keypad",
201 .set_cor = true,
202 SIH_INITIALIZER(KEYPAD_KEYP, 4)
204 [2] = {
205 .name = "bci",
206 .module = TWL5031_MODULE_INTERRUPTS,
207 .control_offset = TWL5031_INTERRUPTS_BCISIHCTRL,
208 .bits = 7,
209 .bytes_ixr = 1,
210 .edr_offset = TWL5031_INTERRUPTS_BCIEDR1,
211 /* Note: most of these IRQs default to no-trigger */
212 .bytes_edr = 2,
213 .irq_lines = 2,
214 .mask = { {
215 .isr_offset = TWL5031_INTERRUPTS_BCIISR1,
216 .imr_offset = TWL5031_INTERRUPTS_BCIIMR1,
217 }, {
218 .isr_offset = TWL5031_INTERRUPTS_BCIISR2,
219 .imr_offset = TWL5031_INTERRUPTS_BCIIMR2,
220 }, },
222 [3] = {
223 .name = "madc",
224 SIH_INITIALIZER(MADC, 4)
226 [4] = {
227 /* USB doesn't use the same SIH organization */
228 .name = "usb",
230 [5] = {
231 .name = "power",
232 .set_cor = true,
233 SIH_INITIALIZER(INT_PWR, 8)
235 [6] = {
237 * ECI/DBI doesn't use the same SIH organization.
238 * For example, it supports only one interrupt output line.
239 * That is, the interrupts are seen on both INT1 and INT2 lines.
241 .name = "eci_dbi",
242 .module = TWL5031_MODULE_ACCESSORY,
243 .bits = 9,
244 .bytes_ixr = 2,
245 .irq_lines = 1,
246 .mask = { {
247 .isr_offset = TWL5031_ACIIDR_LSB,
248 .imr_offset = TWL5031_ACIIMR_LSB,
249 }, },
252 [7] = {
253 /* Audio accessory */
254 .name = "audio",
255 .module = TWL5031_MODULE_ACCESSORY,
256 .control_offset = TWL5031_ACCSIHCTRL,
257 .bits = 2,
258 .bytes_ixr = 1,
259 .edr_offset = TWL5031_ACCEDR1,
260 /* Note: most of these IRQs default to no-trigger */
261 .bytes_edr = 1,
262 .irq_lines = 2,
263 .mask = { {
264 .isr_offset = TWL5031_ACCISR1,
265 .imr_offset = TWL5031_ACCIMR1,
266 }, {
267 .isr_offset = TWL5031_ACCISR2,
268 .imr_offset = TWL5031_ACCIMR2,
269 }, },
273 #undef TWL4030_MODULE_KEYPAD_KEYP
274 #undef TWL4030_MODULE_INT_PWR
275 #undef TWL4030_INT_PWR_EDR
277 /*----------------------------------------------------------------------*/
279 static unsigned twl4030_irq_base;
281 static struct completion irq_event;
284 * This thread processes interrupts reported by the Primary Interrupt Handler.
286 static int twl4030_irq_thread(void *data)
288 long irq = (long)data;
289 static unsigned i2c_errors;
290 static const unsigned max_i2c_errors = 100;
293 current->flags |= PF_NOFREEZE;
295 while (!kthread_should_stop()) {
296 int ret;
297 int module_irq;
298 u8 pih_isr;
300 /* Wait for IRQ, then read PIH irq status (also blocking) */
301 wait_for_completion_interruptible(&irq_event);
303 ret = twl_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr,
304 REG_PIH_ISR_P1);
305 if (ret) {
306 pr_warning("twl4030: I2C error %d reading PIH ISR\n",
307 ret);
308 if (++i2c_errors >= max_i2c_errors) {
309 printk(KERN_ERR "Maximum I2C error count"
310 " exceeded. Terminating %s.\n",
311 __func__);
312 break;
314 complete(&irq_event);
315 continue;
318 /* these handlers deal with the relevant SIH irq status */
319 local_irq_disable();
320 for (module_irq = twl4030_irq_base;
321 pih_isr;
322 pih_isr >>= 1, module_irq++) {
323 if (pih_isr & 0x1)
324 generic_handle_irq(module_irq);
326 local_irq_enable();
328 enable_irq(irq);
331 return 0;
335 * handle_twl4030_pih() is the desc->handle method for the twl4030 interrupt.
336 * This is a chained interrupt, so there is no desc->action method for it.
337 * Now we need to query the interrupt controller in the twl4030 to determine
338 * which module is generating the interrupt request. However, we can't do i2c
339 * transactions in interrupt context, so we must defer that work to a kernel
340 * thread. All we do here is acknowledge and mask the interrupt and wakeup
341 * the kernel thread.
343 static irqreturn_t handle_twl4030_pih(int irq, void *devid)
345 /* Acknowledge, clear *AND* mask the interrupt... */
346 disable_irq_nosync(irq);
347 complete(devid);
348 return IRQ_HANDLED;
350 /*----------------------------------------------------------------------*/
353 * twl4030_init_sih_modules() ... start from a known state where no
354 * IRQs will be coming in, and where we can quickly enable them then
355 * handle them as they arrive. Mask all IRQs: maybe init SIH_CTRL.
357 * NOTE: we don't touch EDR registers here; they stay with hardware
358 * defaults or whatever the last value was. Note that when both EDR
359 * bits for an IRQ are clear, that's as if its IMR bit is set...
361 static int twl4030_init_sih_modules(unsigned line)
363 const struct sih *sih;
364 u8 buf[4];
365 int i;
366 int status;
368 /* line 0 == int1_n signal; line 1 == int2_n signal */
369 if (line > 1)
370 return -EINVAL;
372 irq_line = line;
374 /* disable all interrupts on our line */
375 memset(buf, 0xff, sizeof buf);
376 sih = sih_modules;
377 for (i = 0; i < nr_sih_modules; i++, sih++) {
379 /* skip USB -- it's funky */
380 if (!sih->bytes_ixr)
381 continue;
383 /* Not all the SIH modules support multiple interrupt lines */
384 if (sih->irq_lines <= line)
385 continue;
387 status = twl_i2c_write(sih->module, buf,
388 sih->mask[line].imr_offset, sih->bytes_ixr);
389 if (status < 0)
390 pr_err("twl4030: err %d initializing %s %s\n",
391 status, sih->name, "IMR");
393 /* Maybe disable "exclusive" mode; buffer second pending irq;
394 * set Clear-On-Read (COR) bit.
396 * NOTE that sometimes COR polarity is documented as being
397 * inverted: for MADC, COR=1 means "clear on write".
398 * And for PWR_INT it's not documented...
400 if (sih->set_cor) {
401 status = twl_i2c_write_u8(sih->module,
402 TWL4030_SIH_CTRL_COR_MASK,
403 sih->control_offset);
404 if (status < 0)
405 pr_err("twl4030: err %d initializing %s %s\n",
406 status, sih->name, "SIH_CTRL");
410 sih = sih_modules;
411 for (i = 0; i < nr_sih_modules; i++, sih++) {
412 u8 rxbuf[4];
413 int j;
415 /* skip USB */
416 if (!sih->bytes_ixr)
417 continue;
419 /* Not all the SIH modules support multiple interrupt lines */
420 if (sih->irq_lines <= line)
421 continue;
423 /* Clear pending interrupt status. Either the read was
424 * enough, or we need to write those bits. Repeat, in
425 * case an IRQ is pending (PENDDIS=0) ... that's not
426 * uncommon with PWR_INT.PWRON.
428 for (j = 0; j < 2; j++) {
429 status = twl_i2c_read(sih->module, rxbuf,
430 sih->mask[line].isr_offset, sih->bytes_ixr);
431 if (status < 0)
432 pr_err("twl4030: err %d initializing %s %s\n",
433 status, sih->name, "ISR");
435 if (!sih->set_cor)
436 status = twl_i2c_write(sih->module, buf,
437 sih->mask[line].isr_offset,
438 sih->bytes_ixr);
439 /* else COR=1 means read sufficed.
440 * (for most SIH modules...)
445 return 0;
448 static inline void activate_irq(int irq)
450 #ifdef CONFIG_ARM
451 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
452 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
454 set_irq_flags(irq, IRQF_VALID);
455 #else
456 /* same effect on other architectures */
457 irq_set_noprobe(irq);
458 #endif
461 /*----------------------------------------------------------------------*/
463 static DEFINE_SPINLOCK(sih_agent_lock);
465 static struct workqueue_struct *wq;
467 struct sih_agent {
468 int irq_base;
469 const struct sih *sih;
471 u32 imr;
472 bool imr_change_pending;
473 struct work_struct mask_work;
475 u32 edge_change;
476 struct work_struct edge_work;
479 static void twl4030_sih_do_mask(struct work_struct *work)
481 struct sih_agent *agent;
482 const struct sih *sih;
483 union {
484 u8 bytes[4];
485 u32 word;
486 } imr;
487 int status;
489 agent = container_of(work, struct sih_agent, mask_work);
491 /* see what work we have */
492 spin_lock_irq(&sih_agent_lock);
493 if (agent->imr_change_pending) {
494 sih = agent->sih;
495 /* byte[0] gets overwritten as we write ... */
496 imr.word = cpu_to_le32(agent->imr << 8);
497 agent->imr_change_pending = false;
498 } else
499 sih = NULL;
500 spin_unlock_irq(&sih_agent_lock);
501 if (!sih)
502 return;
504 /* write the whole mask ... simpler than subsetting it */
505 status = twl_i2c_write(sih->module, imr.bytes,
506 sih->mask[irq_line].imr_offset, sih->bytes_ixr);
507 if (status)
508 pr_err("twl4030: %s, %s --> %d\n", __func__,
509 "write", status);
512 static void twl4030_sih_do_edge(struct work_struct *work)
514 struct sih_agent *agent;
515 const struct sih *sih;
516 u8 bytes[6];
517 u32 edge_change;
518 int status;
520 agent = container_of(work, struct sih_agent, edge_work);
522 /* see what work we have */
523 spin_lock_irq(&sih_agent_lock);
524 edge_change = agent->edge_change;
525 agent->edge_change = 0;
526 sih = edge_change ? agent->sih : NULL;
527 spin_unlock_irq(&sih_agent_lock);
528 if (!sih)
529 return;
531 /* Read, reserving first byte for write scratch. Yes, this
532 * could be cached for some speedup ... but be careful about
533 * any processor on the other IRQ line, EDR registers are
534 * shared.
536 status = twl_i2c_read(sih->module, bytes + 1,
537 sih->edr_offset, sih->bytes_edr);
538 if (status) {
539 pr_err("twl4030: %s, %s --> %d\n", __func__,
540 "read", status);
541 return;
544 /* Modify only the bits we know must change */
545 while (edge_change) {
546 int i = fls(edge_change) - 1;
547 struct irq_data *idata = irq_get_irq_data(i + agent->irq_base);
548 int byte = 1 + (i >> 2);
549 int off = (i & 0x3) * 2;
550 unsigned int type;
552 bytes[byte] &= ~(0x03 << off);
554 type = irqd_get_trigger_type(idata);
555 if (type & IRQ_TYPE_EDGE_RISING)
556 bytes[byte] |= BIT(off + 1);
557 if (type & IRQ_TYPE_EDGE_FALLING)
558 bytes[byte] |= BIT(off + 0);
560 edge_change &= ~BIT(i);
563 /* Write */
564 status = twl_i2c_write(sih->module, bytes,
565 sih->edr_offset, sih->bytes_edr);
566 if (status)
567 pr_err("twl4030: %s, %s --> %d\n", __func__,
568 "write", status);
571 /*----------------------------------------------------------------------*/
574 * All irq_chip methods get issued from code holding irq_desc[irq].lock,
575 * which can't perform the underlying I2C operations (because they sleep).
576 * So we must hand them off to a thread (workqueue) and cope with asynch
577 * completion, potentially including some re-ordering, of these requests.
580 static void twl4030_sih_mask(struct irq_data *data)
582 struct sih_agent *sih = irq_data_get_irq_chip_data(data);
583 unsigned long flags;
585 spin_lock_irqsave(&sih_agent_lock, flags);
586 sih->imr |= BIT(data->irq - sih->irq_base);
587 sih->imr_change_pending = true;
588 queue_work(wq, &sih->mask_work);
589 spin_unlock_irqrestore(&sih_agent_lock, flags);
592 static void twl4030_sih_unmask(struct irq_data *data)
594 struct sih_agent *sih = irq_data_get_irq_chip_data(data);
595 unsigned long flags;
597 spin_lock_irqsave(&sih_agent_lock, flags);
598 sih->imr &= ~BIT(data->irq - sih->irq_base);
599 sih->imr_change_pending = true;
600 queue_work(wq, &sih->mask_work);
601 spin_unlock_irqrestore(&sih_agent_lock, flags);
604 static int twl4030_sih_set_type(struct irq_data *data, unsigned trigger)
606 struct sih_agent *sih = irq_data_get_irq_chip_data(data);
607 unsigned long flags;
609 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
610 return -EINVAL;
612 spin_lock_irqsave(&sih_agent_lock, flags);
613 if (irqd_get_trigger_type(data) != trigger) {
614 sih->edge_change |= BIT(data->irq - sih->irq_base);
615 queue_work(wq, &sih->edge_work);
617 spin_unlock_irqrestore(&sih_agent_lock, flags);
618 return 0;
621 static struct irq_chip twl4030_sih_irq_chip = {
622 .name = "twl4030",
623 .irq_mask = twl4030_sih_mask,
624 .irq_unmask = twl4030_sih_unmask,
625 .irq_set_type = twl4030_sih_set_type,
628 /*----------------------------------------------------------------------*/
630 static inline int sih_read_isr(const struct sih *sih)
632 int status;
633 union {
634 u8 bytes[4];
635 u32 word;
636 } isr;
638 /* FIXME need retry-on-error ... */
640 isr.word = 0;
641 status = twl_i2c_read(sih->module, isr.bytes,
642 sih->mask[irq_line].isr_offset, sih->bytes_ixr);
644 return (status < 0) ? status : le32_to_cpu(isr.word);
648 * Generic handler for SIH interrupts ... we "know" this is called
649 * in task context, with IRQs enabled.
651 static void handle_twl4030_sih(unsigned irq, struct irq_desc *desc)
653 struct sih_agent *agent = irq_get_handler_data(irq);
654 const struct sih *sih = agent->sih;
655 int isr;
657 /* reading ISR acks the IRQs, using clear-on-read mode */
658 local_irq_enable();
659 isr = sih_read_isr(sih);
660 local_irq_disable();
662 if (isr < 0) {
663 pr_err("twl4030: %s SIH, read ISR error %d\n",
664 sih->name, isr);
665 /* REVISIT: recover; eventually mask it all, etc */
666 return;
669 while (isr) {
670 irq = fls(isr);
671 irq--;
672 isr &= ~BIT(irq);
674 if (irq < sih->bits)
675 generic_handle_irq(agent->irq_base + irq);
676 else
677 pr_err("twl4030: %s SIH, invalid ISR bit %d\n",
678 sih->name, irq);
682 static unsigned twl4030_irq_next;
684 /* returns the first IRQ used by this SIH bank,
685 * or negative errno
687 int twl4030_sih_setup(int module)
689 int sih_mod;
690 const struct sih *sih = NULL;
691 struct sih_agent *agent;
692 int i, irq;
693 int status = -EINVAL;
694 unsigned irq_base = twl4030_irq_next;
696 /* only support modules with standard clear-on-read for now */
697 for (sih_mod = 0, sih = sih_modules;
698 sih_mod < nr_sih_modules;
699 sih_mod++, sih++) {
700 if (sih->module == module && sih->set_cor) {
701 if (!WARN((irq_base + sih->bits) > NR_IRQS,
702 "irq %d for %s too big\n",
703 irq_base + sih->bits,
704 sih->name))
705 status = 0;
706 break;
709 if (status < 0)
710 return status;
712 agent = kzalloc(sizeof *agent, GFP_KERNEL);
713 if (!agent)
714 return -ENOMEM;
716 status = 0;
718 agent->irq_base = irq_base;
719 agent->sih = sih;
720 agent->imr = ~0;
721 INIT_WORK(&agent->mask_work, twl4030_sih_do_mask);
722 INIT_WORK(&agent->edge_work, twl4030_sih_do_edge);
724 for (i = 0; i < sih->bits; i++) {
725 irq = irq_base + i;
727 irq_set_chip_and_handler(irq, &twl4030_sih_irq_chip,
728 handle_edge_irq);
729 irq_set_chip_data(irq, agent);
730 activate_irq(irq);
733 status = irq_base;
734 twl4030_irq_next += i;
736 /* replace generic PIH handler (handle_simple_irq) */
737 irq = sih_mod + twl4030_irq_base;
738 irq_set_handler_data(irq, agent);
739 irq_set_chained_handler(irq, handle_twl4030_sih);
741 pr_info("twl4030: %s (irq %d) chaining IRQs %d..%d\n", sih->name,
742 irq, irq_base, twl4030_irq_next - 1);
744 return status;
747 /* FIXME need a call to reverse twl4030_sih_setup() ... */
750 /*----------------------------------------------------------------------*/
752 /* FIXME pass in which interrupt line we'll use ... */
753 #define twl_irq_line 0
755 int twl4030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
757 static struct irq_chip twl4030_irq_chip;
759 int status;
760 int i;
761 struct task_struct *task;
764 * Mask and clear all TWL4030 interrupts since initially we do
765 * not have any TWL4030 module interrupt handlers present
767 status = twl4030_init_sih_modules(twl_irq_line);
768 if (status < 0)
769 return status;
771 wq = create_singlethread_workqueue("twl4030-irqchip");
772 if (!wq) {
773 pr_err("twl4030: workqueue FAIL\n");
774 return -ESRCH;
777 twl4030_irq_base = irq_base;
779 /* install an irq handler for each of the SIH modules;
780 * clone dummy irq_chip since PIH can't *do* anything
782 twl4030_irq_chip = dummy_irq_chip;
783 twl4030_irq_chip.name = "twl4030";
785 twl4030_sih_irq_chip.irq_ack = dummy_irq_chip.irq_ack;
787 for (i = irq_base; i < irq_end; i++) {
788 irq_set_chip_and_handler(i, &twl4030_irq_chip,
789 handle_simple_irq);
790 activate_irq(i);
792 twl4030_irq_next = i;
793 pr_info("twl4030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
794 irq_num, irq_base, twl4030_irq_next - 1);
796 /* ... and the PWR_INT module ... */
797 status = twl4030_sih_setup(TWL4030_MODULE_INT);
798 if (status < 0) {
799 pr_err("twl4030: sih_setup PWR INT --> %d\n", status);
800 goto fail;
803 /* install an irq handler to demultiplex the TWL4030 interrupt */
806 init_completion(&irq_event);
808 status = request_irq(irq_num, handle_twl4030_pih, IRQF_DISABLED,
809 "TWL4030-PIH", &irq_event);
810 if (status < 0) {
811 pr_err("twl4030: could not claim irq%d: %d\n", irq_num, status);
812 goto fail_rqirq;
815 task = kthread_run(twl4030_irq_thread, (void *)(long)irq_num,
816 "twl4030-irq");
817 if (IS_ERR(task)) {
818 pr_err("twl4030: could not create irq %d thread!\n", irq_num);
819 status = PTR_ERR(task);
820 goto fail_kthread;
822 return status;
823 fail_kthread:
824 free_irq(irq_num, &irq_event);
825 fail_rqirq:
826 /* clean up twl4030_sih_setup */
827 fail:
828 for (i = irq_base; i < irq_end; i++)
829 irq_set_chip_and_handler(i, NULL, NULL);
830 destroy_workqueue(wq);
831 wq = NULL;
832 return status;
835 int twl4030_exit_irq(void)
837 /* FIXME undo twl_init_irq() */
838 if (twl4030_irq_base) {
839 pr_err("twl4030: can't yet clean up IRQs?\n");
840 return -ENOSYS;
842 return 0;
845 int twl4030_init_chip_irq(const char *chip)
847 if (!strcmp(chip, "twl5031")) {
848 sih_modules = sih_modules_twl5031;
849 nr_sih_modules = ARRAY_SIZE(sih_modules_twl5031);
850 } else {
851 sih_modules = sih_modules_twl4030;
852 nr_sih_modules = ARRAY_SIZE(sih_modules_twl4030);
855 return 0;