1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * twl4030-irq.c - TWL4030/TPS659x0 irq support
5 * Copyright (C) 2005-2006 Texas Instruments, Inc.
7 * Modifications to defer interrupt handling to a kernel thread:
8 * Copyright (C) 2006 MontaVista Software, Inc.
10 * Based on tlv320aic23.c:
11 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
13 * Code cleanup and modifications to IRQ handler.
14 * by syed khasim <x0khasim@ti.com>
17 #include <linux/export.h>
18 #include <linux/interrupt.h>
19 #include <linux/irq.h>
20 #include <linux/slab.h>
22 #include <linux/irqdomain.h>
23 #include <linux/mfd/twl.h>
28 * TWL4030 IRQ handling has two stages in hardware, and thus in software.
29 * The Primary Interrupt Handler (PIH) stage exposes status bits saying
30 * which Secondary Interrupt Handler (SIH) stage is raising an interrupt.
31 * SIH modules are more traditional IRQ components, which support per-IRQ
32 * enable/disable and trigger controls; they do most of the work.
34 * These chips are designed to support IRQ handling from two different
35 * I2C masters. Each has a dedicated IRQ line, and dedicated IRQ status
36 * and mask registers in the PIH and SIH modules.
38 * We set up IRQs starting at a platform-specified base, always starting
39 * with PIH and the SIH for PWR_INT and then usually adding GPIO:
40 * base + 0 .. base + 7 PIH
41 * base + 8 .. base + 15 SIH for PWR_INT
42 * base + 16 .. base + 33 SIH for GPIO
44 #define TWL4030_CORE_NR_IRQS 8
45 #define TWL4030_PWR_NR_IRQS 8
47 /* PIH register offsets */
48 #define REG_PIH_ISR_P1 0x01
49 #define REG_PIH_ISR_P2 0x02
50 #define REG_PIH_SIR 0x03 /* for testing */
52 /* Linux could (eventually) use either IRQ line */
57 u8 module; /* module id */
58 u8 control_offset; /* for SIH_CTRL */
61 u8 bits; /* valid in isr/imr */
62 u8 bytes_ixr; /* bytelen of ISR/IMR/SIR */
65 u8 bytes_edr; /* bytelen of EDR */
67 u8 irq_lines; /* number of supported irq lines */
69 /* SIR ignored -- set interrupt, for testing only */
74 /* + 2 bytes padding */
77 static const struct sih *sih_modules;
78 static int nr_sih_modules;
80 #define SIH_INITIALIZER(modname, nbits) \
81 .module = TWL4030_MODULE_ ## modname, \
82 .control_offset = TWL4030_ ## modname ## _SIH_CTRL, \
84 .bytes_ixr = DIV_ROUND_UP(nbits, 8), \
85 .edr_offset = TWL4030_ ## modname ## _EDR, \
86 .bytes_edr = DIV_ROUND_UP((2*(nbits)), 8), \
89 .isr_offset = TWL4030_ ## modname ## _ISR1, \
90 .imr_offset = TWL4030_ ## modname ## _IMR1, \
93 .isr_offset = TWL4030_ ## modname ## _ISR2, \
94 .imr_offset = TWL4030_ ## modname ## _IMR2, \
97 /* register naming policies are inconsistent ... */
98 #define TWL4030_INT_PWR_EDR TWL4030_INT_PWR_EDR1
99 #define TWL4030_MODULE_KEYPAD_KEYP TWL4030_MODULE_KEYPAD
100 #define TWL4030_MODULE_INT_PWR TWL4030_MODULE_INT
104 * Order in this table matches order in PIH_ISR. That is,
105 * BIT(n) in PIH_ISR is sih_modules[n].
107 /* sih_modules_twl4030 is used both in twl4030 and twl5030 */
108 static const struct sih sih_modules_twl4030[6] = {
111 .module = TWL4030_MODULE_GPIO,
112 .control_offset = REG_GPIO_SIH_CTRL,
114 .bits = TWL4030_GPIO_MAX,
116 /* Note: *all* of these IRQs default to no-trigger */
117 .edr_offset = REG_GPIO_EDR1,
121 .isr_offset = REG_GPIO_ISR1A,
122 .imr_offset = REG_GPIO_IMR1A,
124 .isr_offset = REG_GPIO_ISR1B,
125 .imr_offset = REG_GPIO_IMR1B,
131 SIH_INITIALIZER(KEYPAD_KEYP, 4)
135 .module = TWL4030_MODULE_INTERRUPTS,
136 .control_offset = TWL4030_INTERRUPTS_BCISIHCTRL,
140 .edr_offset = TWL4030_INTERRUPTS_BCIEDR1,
141 /* Note: most of these IRQs default to no-trigger */
145 .isr_offset = TWL4030_INTERRUPTS_BCIISR1A,
146 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1A,
148 .isr_offset = TWL4030_INTERRUPTS_BCIISR1B,
149 .imr_offset = TWL4030_INTERRUPTS_BCIIMR1B,
154 SIH_INITIALIZER(MADC, 4)
157 /* USB doesn't use the same SIH organization */
163 SIH_INITIALIZER(INT_PWR, 8)
165 /* there are no SIH modules #6 or #7 ... */
168 static const struct sih sih_modules_twl5031[8] = {
171 .module = TWL4030_MODULE_GPIO,
172 .control_offset = REG_GPIO_SIH_CTRL,
174 .bits = TWL4030_GPIO_MAX,
176 /* Note: *all* of these IRQs default to no-trigger */
177 .edr_offset = REG_GPIO_EDR1,
181 .isr_offset = REG_GPIO_ISR1A,
182 .imr_offset = REG_GPIO_IMR1A,
184 .isr_offset = REG_GPIO_ISR1B,
185 .imr_offset = REG_GPIO_IMR1B,
191 SIH_INITIALIZER(KEYPAD_KEYP, 4)
195 .module = TWL5031_MODULE_INTERRUPTS,
196 .control_offset = TWL5031_INTERRUPTS_BCISIHCTRL,
199 .edr_offset = TWL5031_INTERRUPTS_BCIEDR1,
200 /* Note: most of these IRQs default to no-trigger */
204 .isr_offset = TWL5031_INTERRUPTS_BCIISR1,
205 .imr_offset = TWL5031_INTERRUPTS_BCIIMR1,
207 .isr_offset = TWL5031_INTERRUPTS_BCIISR2,
208 .imr_offset = TWL5031_INTERRUPTS_BCIIMR2,
213 SIH_INITIALIZER(MADC, 4)
216 /* USB doesn't use the same SIH organization */
222 SIH_INITIALIZER(INT_PWR, 8)
226 * ECI/DBI doesn't use the same SIH organization.
227 * For example, it supports only one interrupt output line.
228 * That is, the interrupts are seen on both INT1 and INT2 lines.
231 .module = TWL5031_MODULE_ACCESSORY,
236 .isr_offset = TWL5031_ACIIDR_LSB,
237 .imr_offset = TWL5031_ACIIMR_LSB,
242 /* Audio accessory */
244 .module = TWL5031_MODULE_ACCESSORY,
245 .control_offset = TWL5031_ACCSIHCTRL,
248 .edr_offset = TWL5031_ACCEDR1,
249 /* Note: most of these IRQs default to no-trigger */
253 .isr_offset = TWL5031_ACCISR1,
254 .imr_offset = TWL5031_ACCIMR1,
256 .isr_offset = TWL5031_ACCISR2,
257 .imr_offset = TWL5031_ACCIMR2,
262 #undef TWL4030_MODULE_KEYPAD_KEYP
263 #undef TWL4030_MODULE_INT_PWR
264 #undef TWL4030_INT_PWR_EDR
266 /*----------------------------------------------------------------------*/
268 static unsigned twl4030_irq_base;
271 * handle_twl4030_pih() is the desc->handle method for the twl4030 interrupt.
272 * This is a chained interrupt, so there is no desc->action method for it.
273 * Now we need to query the interrupt controller in the twl4030 to determine
274 * which module is generating the interrupt request. However, we can't do i2c
275 * transactions in interrupt context, so we must defer that work to a kernel
276 * thread. All we do here is acknowledge and mask the interrupt and wakeup
279 static irqreturn_t handle_twl4030_pih(int irq, void *devid)
284 ret = twl_i2c_read_u8(TWL_MODULE_PIH, &pih_isr,
287 pr_warn("twl4030: I2C error %d reading PIH ISR\n", ret);
292 unsigned long pending = __ffs(pih_isr);
295 pih_isr &= ~BIT(pending);
296 irq = pending + twl4030_irq_base;
297 handle_nested_irq(irq);
303 /*----------------------------------------------------------------------*/
306 * twl4030_init_sih_modules() ... start from a known state where no
307 * IRQs will be coming in, and where we can quickly enable them then
308 * handle them as they arrive. Mask all IRQs: maybe init SIH_CTRL.
310 * NOTE: we don't touch EDR registers here; they stay with hardware
311 * defaults or whatever the last value was. Note that when both EDR
312 * bits for an IRQ are clear, that's as if its IMR bit is set...
314 static int twl4030_init_sih_modules(unsigned line)
316 const struct sih *sih;
321 /* line 0 == int1_n signal; line 1 == int2_n signal */
327 /* disable all interrupts on our line */
328 memset(buf, 0xff, sizeof(buf));
330 for (i = 0; i < nr_sih_modules; i++, sih++) {
331 /* skip USB -- it's funky */
335 /* Not all the SIH modules support multiple interrupt lines */
336 if (sih->irq_lines <= line)
339 status = twl_i2c_write(sih->module, buf,
340 sih->mask[line].imr_offset, sih->bytes_ixr);
342 pr_err("twl4030: err %d initializing %s %s\n",
343 status, sih->name, "IMR");
346 * Maybe disable "exclusive" mode; buffer second pending irq;
347 * set Clear-On-Read (COR) bit.
349 * NOTE that sometimes COR polarity is documented as being
350 * inverted: for MADC, COR=1 means "clear on write".
351 * And for PWR_INT it's not documented...
354 status = twl_i2c_write_u8(sih->module,
355 TWL4030_SIH_CTRL_COR_MASK,
356 sih->control_offset);
358 pr_err("twl4030: err %d initializing %s %s\n",
359 status, sih->name, "SIH_CTRL");
364 for (i = 0; i < nr_sih_modules; i++, sih++) {
372 /* Not all the SIH modules support multiple interrupt lines */
373 if (sih->irq_lines <= line)
377 * Clear pending interrupt status. Either the read was
378 * enough, or we need to write those bits. Repeat, in
379 * case an IRQ is pending (PENDDIS=0) ... that's not
380 * uncommon with PWR_INT.PWRON.
382 for (j = 0; j < 2; j++) {
383 status = twl_i2c_read(sih->module, rxbuf,
384 sih->mask[line].isr_offset, sih->bytes_ixr);
386 pr_warn("twl4030: err %d initializing %s %s\n",
387 status, sih->name, "ISR");
390 status = twl_i2c_write(sih->module, buf,
391 sih->mask[line].isr_offset,
394 pr_warn("twl4030: write failed: %d\n",
398 * else COR=1 means read sufficed.
399 * (for most SIH modules...)
407 static inline void activate_irq(int irq)
409 irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
412 /*----------------------------------------------------------------------*/
416 const struct sih *sih;
419 bool imr_change_pending;
423 struct mutex irq_lock;
427 /*----------------------------------------------------------------------*/
430 * All irq_chip methods get issued from code holding irq_desc[irq].lock,
431 * which can't perform the underlying I2C operations (because they sleep).
432 * So we must hand them off to a thread (workqueue) and cope with asynch
433 * completion, potentially including some re-ordering, of these requests.
436 static void twl4030_sih_mask(struct irq_data *data)
438 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
440 agent->imr |= BIT(data->irq - agent->irq_base);
441 agent->imr_change_pending = true;
444 static void twl4030_sih_unmask(struct irq_data *data)
446 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
448 agent->imr &= ~BIT(data->irq - agent->irq_base);
449 agent->imr_change_pending = true;
452 static int twl4030_sih_set_type(struct irq_data *data, unsigned trigger)
454 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
456 if (trigger & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
459 if (irqd_get_trigger_type(data) != trigger)
460 agent->edge_change |= BIT(data->irq - agent->irq_base);
465 static void twl4030_sih_bus_lock(struct irq_data *data)
467 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
469 mutex_lock(&agent->irq_lock);
472 static void twl4030_sih_bus_sync_unlock(struct irq_data *data)
474 struct sih_agent *agent = irq_data_get_irq_chip_data(data);
475 const struct sih *sih = agent->sih;
478 if (agent->imr_change_pending) {
484 /* byte[0] gets overwritten as we write ... */
485 imr.word = cpu_to_le32(agent->imr);
486 agent->imr_change_pending = false;
488 /* write the whole mask ... simpler than subsetting it */
489 status = twl_i2c_write(sih->module, imr.bytes,
490 sih->mask[irq_line].imr_offset,
493 pr_err("twl4030: %s, %s --> %d\n", __func__,
497 if (agent->edge_change) {
501 edge_change = agent->edge_change;
502 agent->edge_change = 0;
505 * Read, reserving first byte for write scratch. Yes, this
506 * could be cached for some speedup ... but be careful about
507 * any processor on the other IRQ line, EDR registers are
510 status = twl_i2c_read(sih->module, bytes,
511 sih->edr_offset, sih->bytes_edr);
513 pr_err("twl4030: %s, %s --> %d\n", __func__,
518 /* Modify only the bits we know must change */
519 while (edge_change) {
520 int i = fls(edge_change) - 1;
522 int off = (i & 0x3) * 2;
525 bytes[byte] &= ~(0x03 << off);
527 type = irq_get_trigger_type(i + agent->irq_base);
528 if (type & IRQ_TYPE_EDGE_RISING)
529 bytes[byte] |= BIT(off + 1);
530 if (type & IRQ_TYPE_EDGE_FALLING)
531 bytes[byte] |= BIT(off + 0);
533 edge_change &= ~BIT(i);
537 status = twl_i2c_write(sih->module, bytes,
538 sih->edr_offset, sih->bytes_edr);
540 pr_err("twl4030: %s, %s --> %d\n", __func__,
544 mutex_unlock(&agent->irq_lock);
547 static struct irq_chip twl4030_sih_irq_chip = {
549 .irq_mask = twl4030_sih_mask,
550 .irq_unmask = twl4030_sih_unmask,
551 .irq_set_type = twl4030_sih_set_type,
552 .irq_bus_lock = twl4030_sih_bus_lock,
553 .irq_bus_sync_unlock = twl4030_sih_bus_sync_unlock,
554 .flags = IRQCHIP_SKIP_SET_WAKE,
557 /*----------------------------------------------------------------------*/
559 static inline int sih_read_isr(const struct sih *sih)
567 /* FIXME need retry-on-error ... */
570 status = twl_i2c_read(sih->module, isr.bytes,
571 sih->mask[irq_line].isr_offset, sih->bytes_ixr);
573 return (status < 0) ? status : le32_to_cpu(isr.word);
577 * Generic handler for SIH interrupts ... we "know" this is called
578 * in task context, with IRQs enabled.
580 static irqreturn_t handle_twl4030_sih(int irq, void *data)
582 struct sih_agent *agent = irq_get_handler_data(irq);
583 const struct sih *sih = agent->sih;
586 /* reading ISR acks the IRQs, using clear-on-read mode */
587 isr = sih_read_isr(sih);
590 pr_err("twl4030: %s SIH, read ISR error %d\n",
592 /* REVISIT: recover; eventually mask it all, etc */
602 handle_nested_irq(agent->irq_base + irq);
604 pr_err("twl4030: %s SIH, invalid ISR bit %d\n",
610 /* returns the first IRQ used by this SIH bank, or negative errno */
611 int twl4030_sih_setup(struct device *dev, int module, int irq_base)
614 const struct sih *sih = NULL;
615 struct sih_agent *agent;
617 int status = -EINVAL;
619 /* only support modules with standard clear-on-read for now */
620 for (sih_mod = 0, sih = sih_modules; sih_mod < nr_sih_modules;
622 if (sih->module == module && sih->set_cor) {
629 dev_err(dev, "module to setup SIH for not found\n");
633 agent = kzalloc(sizeof(*agent), GFP_KERNEL);
637 agent->irq_base = irq_base;
640 mutex_init(&agent->irq_lock);
642 for (i = 0; i < sih->bits; i++) {
645 irq_set_chip_data(irq, agent);
646 irq_set_chip_and_handler(irq, &twl4030_sih_irq_chip,
648 irq_set_nested_thread(irq, 1);
652 /* replace generic PIH handler (handle_simple_irq) */
653 irq = sih_mod + twl4030_irq_base;
654 irq_set_handler_data(irq, agent);
655 agent->irq_name = kasprintf(GFP_KERNEL, "twl4030_%s", sih->name);
656 status = request_threaded_irq(irq, NULL, handle_twl4030_sih,
657 IRQF_EARLY_RESUME | IRQF_ONESHOT,
658 agent->irq_name ?: sih->name, NULL);
660 dev_info(dev, "%s (irq %d) chaining IRQs %d..%d\n", sih->name,
661 irq, irq_base, irq_base + i - 1);
663 return status < 0 ? status : irq_base;
666 /* FIXME need a call to reverse twl4030_sih_setup() ... */
668 /*----------------------------------------------------------------------*/
670 /* FIXME pass in which interrupt line we'll use ... */
671 #define twl_irq_line 0
673 int twl4030_init_irq(struct device *dev, int irq_num)
675 static struct irq_chip twl4030_irq_chip;
677 int irq_base, irq_end, nr_irqs;
678 struct device_node *node = dev->of_node;
681 * TWL core and pwr interrupts must be contiguous because
682 * the hwirqs numbers are defined contiguously from 1 to 15.
683 * Create only one domain for both.
685 nr_irqs = TWL4030_PWR_NR_IRQS + TWL4030_CORE_NR_IRQS;
687 irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
689 dev_err(dev, "Fail to allocate IRQ descs\n");
693 irq_domain_add_legacy(node, nr_irqs, irq_base, 0,
694 &irq_domain_simple_ops, NULL);
696 irq_end = irq_base + TWL4030_CORE_NR_IRQS;
699 * Mask and clear all TWL4030 interrupts since initially we do
700 * not have any TWL4030 module interrupt handlers present
702 status = twl4030_init_sih_modules(twl_irq_line);
706 twl4030_irq_base = irq_base;
709 * Install an irq handler for each of the SIH modules;
710 * clone dummy irq_chip since PIH can't *do* anything
712 twl4030_irq_chip = dummy_irq_chip;
713 twl4030_irq_chip.name = "twl4030";
715 twl4030_sih_irq_chip.irq_ack = dummy_irq_chip.irq_ack;
717 for (i = irq_base; i < irq_end; i++) {
718 irq_set_chip_and_handler(i, &twl4030_irq_chip,
720 irq_set_nested_thread(i, 1);
724 dev_info(dev, "%s (irq %d) chaining IRQs %d..%d\n", "PIH",
725 irq_num, irq_base, irq_end);
727 /* ... and the PWR_INT module ... */
728 status = twl4030_sih_setup(dev, TWL4030_MODULE_INT, irq_end);
730 dev_err(dev, "sih_setup PWR INT --> %d\n", status);
734 /* install an irq handler to demultiplex the TWL4030 interrupt */
735 status = request_threaded_irq(irq_num, NULL, handle_twl4030_pih,
737 "TWL4030-PIH", NULL);
739 dev_err(dev, "could not claim irq%d: %d\n", irq_num, status);
742 enable_irq_wake(irq_num);
746 /* clean up twl4030_sih_setup */
748 for (i = irq_base; i < irq_end; i++) {
749 irq_set_nested_thread(i, 0);
750 irq_set_chip_and_handler(i, NULL, NULL);
756 void twl4030_exit_irq(void)
758 /* FIXME undo twl_init_irq() */
759 if (twl4030_irq_base)
760 pr_err("twl4030: can't yet clean up IRQs?\n");
763 int twl4030_init_chip_irq(const char *chip)
765 if (!strcmp(chip, "twl5031")) {
766 sih_modules = sih_modules_twl5031;
767 nr_sih_modules = ARRAY_SIZE(sih_modules_twl5031);
769 sih_modules = sih_modules_twl4030;
770 nr_sih_modules = ARRAY_SIZE(sih_modules_twl4030);