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/slab.h>
35 #include <linux/i2c/twl.h>
40 * TWL4030 IRQ handling has two stages in hardware, and thus in software.
41 * The Primary Interrupt Handler (PIH) stage exposes status bits saying
42 * which Secondary Interrupt Handler (SIH) stage is raising an interrupt.
43 * SIH modules are more traditional IRQ components, which support per-IRQ
44 * enable/disable and trigger controls; they do most of the work.
46 * These chips are designed to support IRQ handling from two different
47 * I2C masters. Each has a dedicated IRQ line, and dedicated IRQ status
48 * and mask registers in the PIH and SIH modules.
50 * We set up IRQs starting at a platform-specified base, always starting
51 * with PIH and the SIH for PWR_INT and then usually adding GPIO:
52 * base + 0 .. base + 7 PIH
53 * base + 8 .. base + 15 SIH for PWR_INT
54 * base + 16 .. base + 33 SIH for GPIO
57 /* PIH register offsets */
58 #define REG_PIH_ISR_P1 0x01
59 #define REG_PIH_ISR_P2 0x02
60 #define REG_PIH_SIR 0x03 /* for testing */
63 /* Linux could (eventually) use either IRQ line */
68 u8 module; /* module id */
69 u8 control_offset; /* for SIH_CTRL */
72 u8 bits; /* valid in isr/imr */
73 u8 bytes_ixr; /* bytelen of ISR/IMR/SIR */
76 u8 bytes_edr; /* bytelen of EDR */
78 u8 irq_lines; /* number of supported irq lines */
80 /* SIR ignored -- set interrupt, for testing only */
85 /* + 2 bytes padding */
88 static const struct sih *sih_modules;
89 static int nr_sih_modules;
91 #define SIH_INITIALIZER(modname, nbits) \
92 .module = TWL4030_MODULE_ ## modname, \
93 .control_offset = TWL4030_ ## modname ## _SIH_CTRL, \
95 .bytes_ixr = DIV_ROUND_UP(nbits, 8), \
96 .edr_offset = TWL4030_ ## modname ## _EDR, \
97 .bytes_edr = DIV_ROUND_UP((2*(nbits)), 8), \
100 .isr_offset = TWL4030_ ## modname ## _ISR1, \
101 .imr_offset = TWL4030_ ## modname ## _IMR1, \
104 .isr_offset = TWL4030_ ## modname ## _ISR2, \
105 .imr_offset = TWL4030_ ## modname ## _IMR2, \
108 /* register naming policies are inconsistent ... */
109 #define TWL4030_INT_PWR_EDR TWL4030_INT_PWR_EDR1
110 #define TWL4030_MODULE_KEYPAD_KEYP TWL4030_MODULE_KEYPAD
111 #define TWL4030_MODULE_INT_PWR TWL4030_MODULE_INT
114 /* Order in this table matches order in PIH_ISR. That is,
115 * BIT(n) in PIH_ISR is sih_modules[n].
117 /* sih_modules_twl4030 is used both in twl4030 and twl5030 */
118 static const struct sih sih_modules_twl4030[6] = {
121 .module = TWL4030_MODULE_GPIO,
122 .control_offset = REG_GPIO_SIH_CTRL,
124 .bits = TWL4030_GPIO_MAX,
126 /* Note: *all* of these IRQs default to no-trigger */
127 .edr_offset = REG_GPIO_EDR1,
131 .isr_offset = REG_GPIO_ISR1A,
132 .imr_offset = REG_GPIO_IMR1A,
134 .isr_offset = REG_GPIO_ISR1B,
135 .imr_offset = REG_GPIO_IMR1B,
141 SIH_INITIALIZER(KEYPAD_KEYP, 4)
145 .module = TWL4030_MODULE_INTERRUPTS,
146 .control_offset = TWL4030_INTERRUPTS_BCISIHCTRL,
150 .edr_offset = TWL4030_INTERRUPTS_BCIEDR1,
151 /* Note: most of these IRQs default to no-trigger */
155 .isr_offset = TWL4030_INTERRUPTS_BCIISR1A,
156 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1A,
158 .isr_offset = TWL4030_INTERRUPTS_BCIISR1B,
159 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1B,
164 SIH_INITIALIZER(MADC, 4)
167 /* USB doesn't use the same SIH organization */
173 SIH_INITIALIZER(INT_PWR, 8)
175 /* there are no SIH modules #6 or #7 ... */
178 static const struct sih sih_modules_twl5031[8] = {
181 .module = TWL4030_MODULE_GPIO,
182 .control_offset = REG_GPIO_SIH_CTRL,
184 .bits = TWL4030_GPIO_MAX,
186 /* Note: *all* of these IRQs default to no-trigger */
187 .edr_offset = REG_GPIO_EDR1,
191 .isr_offset = REG_GPIO_ISR1A,
192 .imr_offset = REG_GPIO_IMR1A,
194 .isr_offset = REG_GPIO_ISR1B,
195 .imr_offset = REG_GPIO_IMR1B,
201 SIH_INITIALIZER(KEYPAD_KEYP, 4)
205 .module = TWL5031_MODULE_INTERRUPTS,
206 .control_offset = TWL5031_INTERRUPTS_BCISIHCTRL,
209 .edr_offset = TWL5031_INTERRUPTS_BCIEDR1,
210 /* Note: most of these IRQs default to no-trigger */
214 .isr_offset = TWL5031_INTERRUPTS_BCIISR1,
215 .imr_offset = TWL5031_INTERRUPTS_BCIIMR1,
217 .isr_offset = TWL5031_INTERRUPTS_BCIISR2,
218 .imr_offset = TWL5031_INTERRUPTS_BCIIMR2,
223 SIH_INITIALIZER(MADC, 4)
226 /* USB doesn't use the same SIH organization */
232 SIH_INITIALIZER(INT_PWR, 8)
236 * ECI/DBI doesn't use the same SIH organization.
237 * For example, it supports only one interrupt output line.
238 * That is, the interrupts are seen on both INT1 and INT2 lines.
241 .module = TWL5031_MODULE_ACCESSORY,
246 .isr_offset = TWL5031_ACIIDR_LSB,
247 .imr_offset = TWL5031_ACIIMR_LSB,
252 /* Audio accessory */
254 .module = TWL5031_MODULE_ACCESSORY,
255 .control_offset = TWL5031_ACCSIHCTRL,
258 .edr_offset = TWL5031_ACCEDR1,
259 /* Note: most of these IRQs default to no-trigger */
263 .isr_offset = TWL5031_ACCISR1,
264 .imr_offset = TWL5031_ACCIMR1,
266 .isr_offset = TWL5031_ACCISR2,
267 .imr_offset = TWL5031_ACCIMR2,
272 #undef TWL4030_MODULE_KEYPAD_KEYP
273 #undef TWL4030_MODULE_INT_PWR
274 #undef TWL4030_INT_PWR_EDR
276 /*----------------------------------------------------------------------*/
278 static unsigned twl4030_irq_base;
281 * handle_twl4030_pih() is the desc->handle method for the twl4030 interrupt.
282 * This is a chained interrupt, so there is no desc->action method for it.
283 * Now we need to query the interrupt controller in the twl4030 to determine
284 * which module is generating the interrupt request. However, we can't do i2c
285 * transactions in interrupt context, so we must defer that work to a kernel
286 * thread. All we do here is acknowledge and mask the interrupt and wakeup
289 static irqreturn_t handle_twl4030_pih(int irq, void *devid)
295 ret = twl_i2c_read_u8(TWL4030_MODULE_PIH, &pih_isr,
298 pr_warning("twl4030: I2C error %d reading PIH ISR\n", ret);
302 /* these handlers deal with the relevant SIH irq status */
303 for (module_irq = twl4030_irq_base;
305 pih_isr >>= 1, module_irq++) {
307 handle_nested_irq(module_irq);
312 /*----------------------------------------------------------------------*/
315 * twl4030_init_sih_modules() ... start from a known state where no
316 * IRQs will be coming in, and where we can quickly enable them then
317 * handle them as they arrive. Mask all IRQs: maybe init SIH_CTRL.
319 * NOTE: we don't touch EDR registers here; they stay with hardware
320 * defaults or whatever the last value was. Note that when both EDR
321 * bits for an IRQ are clear, that's as if its IMR bit is set...
323 static int twl4030_init_sih_modules(unsigned line)
325 const struct sih *sih;
330 /* line 0 == int1_n signal; line 1 == int2_n signal */
336 /* disable all interrupts on our line */
337 memset(buf, 0xff, sizeof buf);
339 for (i = 0; i < nr_sih_modules; i++, sih++) {
341 /* skip USB -- it's funky */
345 /* Not all the SIH modules support multiple interrupt lines */
346 if (sih->irq_lines <= line)
349 status = twl_i2c_write(sih->module, buf,
350 sih->mask[line].imr_offset, sih->bytes_ixr);
352 pr_err("twl4030: err %d initializing %s %s\n",
353 status, sih->name, "IMR");
355 /* Maybe disable "exclusive" mode; buffer second pending irq;
356 * set Clear-On-Read (COR) bit.
358 * NOTE that sometimes COR polarity is documented as being
359 * inverted: for MADC, COR=1 means "clear on write".
360 * And for PWR_INT it's not documented...
363 status = twl_i2c_write_u8(sih->module,
364 TWL4030_SIH_CTRL_COR_MASK,
365 sih->control_offset);
367 pr_err("twl4030: err %d initializing %s %s\n",
368 status, sih->name, "SIH_CTRL");
373 for (i = 0; i < nr_sih_modules; i++, sih++) {
381 /* Not all the SIH modules support multiple interrupt lines */
382 if (sih->irq_lines <= line)
385 /* Clear pending interrupt status. Either the read was
386 * enough, or we need to write those bits. Repeat, in
387 * case an IRQ is pending (PENDDIS=0) ... that's not
388 * uncommon with PWR_INT.PWRON.
390 for (j = 0; j < 2; j++) {
391 status = twl_i2c_read(sih->module, rxbuf,
392 sih->mask[line].isr_offset, sih->bytes_ixr);
394 pr_err("twl4030: err %d initializing %s %s\n",
395 status, sih->name, "ISR");
398 status = twl_i2c_write(sih->module, buf,
399 sih->mask[line].isr_offset,
401 /* else COR=1 means read sufficed.
402 * (for most SIH modules...)
410 static inline void activate_irq(int irq)
413 /* ARM requires an extra step to clear IRQ_NOREQUEST, which it
414 * sets on behalf of every irq_chip. Also sets IRQ_NOPROBE.
416 set_irq_flags(irq, IRQF_VALID);
418 /* same effect on other architectures */
419 irq_set_noprobe(irq);
423 /*----------------------------------------------------------------------*/
427 const struct sih *sih;
430 bool imr_change_pending;
434 struct mutex irq_lock;
437 /*----------------------------------------------------------------------*/
440 * All irq_chip methods get issued from code holding irq_desc[irq].lock,
441 * which can't perform the underlying I2C operations (because they sleep).
442 * So we must hand them off to a thread (workqueue) and cope with asynch
443 * completion, potentially including some re-ordering, of these requests.
446 static void twl4030_sih_mask(struct irq_data *data)
448 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
450 agent->imr |= BIT(data->irq - agent->irq_base);
451 agent->imr_change_pending = true;
454 static void twl4030_sih_unmask(struct irq_data *data)
456 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
458 agent->imr &= ~BIT(data->irq - agent->irq_base);
459 agent->imr_change_pending = true;
462 static int twl4030_sih_set_type(struct irq_data *data, unsigned trigger)
464 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
466 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
469 if (irqd_get_trigger_type(data) != trigger)
470 agent->edge_change |= BIT(data->irq - agent->irq_base);
475 static void twl4030_sih_bus_lock(struct irq_data *data)
477 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
479 mutex_lock(&agent->irq_lock);
482 static void twl4030_sih_bus_sync_unlock(struct irq_data *data)
484 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
485 const struct sih *sih = agent->sih;
488 if (agent->imr_change_pending) {
494 /* byte[0] gets overwriten as we write ... */
495 imr.word = cpu_to_le32(agent->imr << 8);
496 agent->imr_change_pending = false;
498 /* write the whole mask ... simpler than subsetting it */
499 status = twl_i2c_write(sih->module, imr.bytes,
500 sih->mask[irq_line].imr_offset,
503 pr_err("twl4030: %s, %s --> %d\n", __func__,
507 if (agent->edge_change) {
511 edge_change = agent->edge_change;
512 agent->edge_change = 0;
515 * Read, reserving first byte for write scratch. Yes, this
516 * could be cached for some speedup ... but be careful about
517 * any processor on the other IRQ line, EDR registers are
520 status = twl_i2c_read(sih->module, bytes + 1,
521 sih->edr_offset, sih->bytes_edr);
523 pr_err("twl4030: %s, %s --> %d\n", __func__,
528 /* Modify only the bits we know must change */
529 while (edge_change) {
530 int i = fls(edge_change) - 1;
531 struct irq_data *idata;
532 int byte = 1 + (i >> 2);
533 int off = (i & 0x3) * 2;
536 idata = irq_get_irq_data(i + agent->irq_base);
538 bytes[byte] &= ~(0x03 << off);
540 type = irqd_get_trigger_type(idata);
541 if (type & IRQ_TYPE_EDGE_RISING)
542 bytes[byte] |= BIT(off + 1);
543 if (type & IRQ_TYPE_EDGE_FALLING)
544 bytes[byte] |= BIT(off + 0);
546 edge_change &= ~BIT(i);
550 status = twl_i2c_write(sih->module, bytes,
551 sih->edr_offset, sih->bytes_edr);
553 pr_err("twl4030: %s, %s --> %d\n", __func__,
557 mutex_unlock(&agent->irq_lock);
560 static struct irq_chip twl4030_sih_irq_chip = {
562 .irq_mask = twl4030_sih_mask,
563 .irq_unmask = twl4030_sih_unmask,
564 .irq_set_type = twl4030_sih_set_type,
565 .irq_bus_lock = twl4030_sih_bus_lock,
566 .irq_bus_sync_unlock = twl4030_sih_bus_sync_unlock,
569 /*----------------------------------------------------------------------*/
571 static inline int sih_read_isr(const struct sih *sih)
579 /* FIXME need retry-on-error ... */
582 status = twl_i2c_read(sih->module, isr.bytes,
583 sih->mask[irq_line].isr_offset, sih->bytes_ixr);
585 return (status < 0) ? status : le32_to_cpu(isr.word);
589 * Generic handler for SIH interrupts ... we "know" this is called
590 * in task context, with IRQs enabled.
592 static void handle_twl4030_sih(unsigned irq, struct irq_desc *desc)
594 struct sih_agent *agent = irq_get_handler_data(irq);
595 const struct sih *sih = agent->sih;
598 /* reading ISR acks the IRQs, using clear-on-read mode */
599 isr = sih_read_isr(sih);
602 pr_err("twl4030: %s SIH, read ISR error %d\n",
604 /* REVISIT: recover; eventually mask it all, etc */
614 handle_nested_irq(agent->irq_base + irq);
616 pr_err("twl4030: %s SIH, invalid ISR bit %d\n",
621 static unsigned twl4030_irq_next;
623 /* returns the first IRQ used by this SIH bank,
626 int twl4030_sih_setup(int module)
629 const struct sih *sih = NULL;
630 struct sih_agent *agent;
632 int status = -EINVAL;
633 unsigned irq_base = twl4030_irq_next;
635 /* only support modules with standard clear-on-read for now */
636 for (sih_mod = 0, sih = sih_modules;
637 sih_mod < nr_sih_modules;
639 if (sih->module == module && sih->set_cor) {
640 if (!WARN((irq_base + sih->bits) > NR_IRQS,
641 "irq %d for %s too big\n",
642 irq_base + sih->bits,
651 agent = kzalloc(sizeof *agent, GFP_KERNEL);
657 agent->irq_base = irq_base;
660 mutex_init(&agent->irq_lock);
662 for (i = 0; i < sih->bits; i++) {
665 irq_set_chip_data(irq, agent);
666 irq_set_chip_and_handler(irq, &twl4030_sih_irq_chip,
672 twl4030_irq_next += i;
674 /* replace generic PIH handler (handle_simple_irq) */
675 irq = sih_mod + twl4030_irq_base;
676 irq_set_handler_data(irq, agent);
677 irq_set_chained_handler(irq, handle_twl4030_sih);
679 pr_info("twl4030: %s (irq %d) chaining IRQs %d..%d\n", sih->name,
680 irq, irq_base, twl4030_irq_next - 1);
685 /* FIXME need a call to reverse twl4030_sih_setup() ... */
688 /*----------------------------------------------------------------------*/
690 /* FIXME pass in which interrupt line we'll use ... */
691 #define twl_irq_line 0
693 int twl4030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
695 static struct irq_chip twl4030_irq_chip;
701 * Mask and clear all TWL4030 interrupts since initially we do
702 * not have any TWL4030 module interrupt handlers present
704 status = twl4030_init_sih_modules(twl_irq_line);
708 twl4030_irq_base = irq_base;
710 /* install an irq handler for each of the SIH modules;
711 * clone dummy irq_chip since PIH can't *do* anything
713 twl4030_irq_chip = dummy_irq_chip;
714 twl4030_irq_chip.name = "twl4030";
716 twl4030_sih_irq_chip.irq_ack = dummy_irq_chip.irq_ack;
718 for (i = irq_base; i < irq_end; i++) {
719 irq_set_chip_and_handler(i, &twl4030_irq_chip,
721 irq_set_nested_thread(i, 1);
724 twl4030_irq_next = i;
725 pr_info("twl4030: %s (irq %d) chaining IRQs %d..%d\n", "PIH",
726 irq_num, irq_base, twl4030_irq_next - 1);
728 /* ... and the PWR_INT module ... */
729 status = twl4030_sih_setup(TWL4030_MODULE_INT);
731 pr_err("twl4030: sih_setup PWR INT --> %d\n", status);
735 /* install an irq handler to demultiplex the TWL4030 interrupt */
736 status = request_threaded_irq(irq_num, NULL, handle_twl4030_pih, 0,
737 "TWL4030-PIH", NULL);
739 pr_err("twl4030: could not claim irq%d: %d\n", irq_num, status);
745 /* clean up twl4030_sih_setup */
747 for (i = irq_base; i < irq_end; i++) {
748 irq_set_nested_thread(i, 0);
749 irq_set_chip_and_handler(i, NULL, NULL);
755 int twl4030_exit_irq(void)
757 /* FIXME undo twl_init_irq() */
758 if (twl4030_irq_base) {
759 pr_err("twl4030: can't yet clean up IRQs?\n");
765 int twl4030_init_chip_irq(const char *chip)
767 if (!strcmp(chip, "twl5031")) {
768 sih_modules = sih_modules_twl5031;
769 nr_sih_modules = ARRAY_SIZE(sih_modules_twl5031);
771 sih_modules = sih_modules_twl4030;
772 nr_sih_modules = ARRAY_SIZE(sih_modules_twl4030);