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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas INTC External IRQ Pin Driver
4 *
5 * Copyright (C) 2013 Magnus Damm
6 */
7
8#include <linux/init.h>
9#include <linux/of.h>
10#include <linux/platform_device.h>
11#include <linux/spinlock.h>
12#include <linux/interrupt.h>
13#include <linux/ioport.h>
14#include <linux/io.h>
15#include <linux/irq.h>
16#include <linux/irqdomain.h>
17#include <linux/err.h>
18#include <linux/slab.h>
19#include <linux/module.h>
20#include <linux/of_device.h>
21#include <linux/pm_runtime.h>
22
23#define INTC_IRQPIN_MAX 8 /* maximum 8 interrupts per driver instance */
24
25#define INTC_IRQPIN_REG_SENSE 0 /* ICRn */
26#define INTC_IRQPIN_REG_PRIO 1 /* INTPRInn */
27#define INTC_IRQPIN_REG_SOURCE 2 /* INTREQnn */
28#define INTC_IRQPIN_REG_MASK 3 /* INTMSKnn */
29#define INTC_IRQPIN_REG_CLEAR 4 /* INTMSKCLRnn */
30#define INTC_IRQPIN_REG_NR_MANDATORY 5
31#define INTC_IRQPIN_REG_IRLM 5 /* ICR0 with IRLM bit (optional) */
32#define INTC_IRQPIN_REG_NR 6
33
34/* INTC external IRQ PIN hardware register access:
35 *
36 * SENSE is read-write 32-bit with 2-bits or 4-bits per IRQ (*)
37 * PRIO is read-write 32-bit with 4-bits per IRQ (**)
38 * SOURCE is read-only 32-bit or 8-bit with 1-bit per IRQ (***)
39 * MASK is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
40 * CLEAR is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
41 *
42 * (*) May be accessed by more than one driver instance - lock needed
43 * (**) Read-modify-write access by one driver instance - lock needed
44 * (***) Accessed by one driver instance only - no locking needed
45 */
46
47struct intc_irqpin_iomem {
48 void __iomem *iomem;
49 unsigned long (*read)(void __iomem *iomem);
50 void (*write)(void __iomem *iomem, unsigned long data);
51 int width;
52};
53
54struct intc_irqpin_irq {
55 int hw_irq;
56 int requested_irq;
57 int domain_irq;
58 struct intc_irqpin_priv *p;
59};
60
61struct intc_irqpin_priv {
62 struct intc_irqpin_iomem iomem[INTC_IRQPIN_REG_NR];
63 struct intc_irqpin_irq irq[INTC_IRQPIN_MAX];
64 unsigned int sense_bitfield_width;
65 struct platform_device *pdev;
66 struct irq_chip irq_chip;
67 struct irq_domain *irq_domain;
68 atomic_t wakeup_path;
69 unsigned shared_irqs:1;
70 u8 shared_irq_mask;
71};
72
73struct intc_irqpin_config {
74 unsigned int irlm_bit;
75 unsigned needs_irlm:1;
76};
77
78static unsigned long intc_irqpin_read32(void __iomem *iomem)
79{
80 return ioread32(iomem);
81}
82
83static unsigned long intc_irqpin_read8(void __iomem *iomem)
84{
85 return ioread8(iomem);
86}
87
88static void intc_irqpin_write32(void __iomem *iomem, unsigned long data)
89{
90 iowrite32(data, iomem);
91}
92
93static void intc_irqpin_write8(void __iomem *iomem, unsigned long data)
94{
95 iowrite8(data, iomem);
96}
97
98static inline unsigned long intc_irqpin_read(struct intc_irqpin_priv *p,
99 int reg)
100{
101 struct intc_irqpin_iomem *i = &p->iomem[reg];
102
103 return i->read(i->iomem);
104}
105
106static inline void intc_irqpin_write(struct intc_irqpin_priv *p,
107 int reg, unsigned long data)
108{
109 struct intc_irqpin_iomem *i = &p->iomem[reg];
110
111 i->write(i->iomem, data);
112}
113
114static inline unsigned long intc_irqpin_hwirq_mask(struct intc_irqpin_priv *p,
115 int reg, int hw_irq)
116{
117 return BIT((p->iomem[reg].width - 1) - hw_irq);
118}
119
120static inline void intc_irqpin_irq_write_hwirq(struct intc_irqpin_priv *p,
121 int reg, int hw_irq)
122{
123 intc_irqpin_write(p, reg, intc_irqpin_hwirq_mask(p, reg, hw_irq));
124}
125
126static DEFINE_RAW_SPINLOCK(intc_irqpin_lock); /* only used by slow path */
127
128static void intc_irqpin_read_modify_write(struct intc_irqpin_priv *p,
129 int reg, int shift,
130 int width, int value)
131{
132 unsigned long flags;
133 unsigned long tmp;
134
135 raw_spin_lock_irqsave(&intc_irqpin_lock, flags);
136
137 tmp = intc_irqpin_read(p, reg);
138 tmp &= ~(((1 << width) - 1) << shift);
139 tmp |= value << shift;
140 intc_irqpin_write(p, reg, tmp);
141
142 raw_spin_unlock_irqrestore(&intc_irqpin_lock, flags);
143}
144
145static void intc_irqpin_mask_unmask_prio(struct intc_irqpin_priv *p,
146 int irq, int do_mask)
147{
148 /* The PRIO register is assumed to be 32-bit with fixed 4-bit fields. */
149 int bitfield_width = 4;
150 int shift = 32 - (irq + 1) * bitfield_width;
151
152 intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_PRIO,
153 shift, bitfield_width,
154 do_mask ? 0 : (1 << bitfield_width) - 1);
155}
156
157static int intc_irqpin_set_sense(struct intc_irqpin_priv *p, int irq, int value)
158{
159 /* The SENSE register is assumed to be 32-bit. */
160 int bitfield_width = p->sense_bitfield_width;
161 int shift = 32 - (irq + 1) * bitfield_width;
162
163 dev_dbg(&p->pdev->dev, "sense irq = %d, mode = %d\n", irq, value);
164
165 if (value >= (1 << bitfield_width))
166 return -EINVAL;
167
168 intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_SENSE, shift,
169 bitfield_width, value);
170 return 0;
171}
172
173static void intc_irqpin_dbg(struct intc_irqpin_irq *i, char *str)
174{
175 dev_dbg(&i->p->pdev->dev, "%s (%d:%d:%d)\n",
176 str, i->requested_irq, i->hw_irq, i->domain_irq);
177}
178
179static void intc_irqpin_irq_enable(struct irq_data *d)
180{
181 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
182 int hw_irq = irqd_to_hwirq(d);
183
184 intc_irqpin_dbg(&p->irq[hw_irq], "enable");
185 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
186}
187
188static void intc_irqpin_irq_disable(struct irq_data *d)
189{
190 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
191 int hw_irq = irqd_to_hwirq(d);
192
193 intc_irqpin_dbg(&p->irq[hw_irq], "disable");
194 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
195}
196
197static void intc_irqpin_shared_irq_enable(struct irq_data *d)
198{
199 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
200 int hw_irq = irqd_to_hwirq(d);
201
202 intc_irqpin_dbg(&p->irq[hw_irq], "shared enable");
203 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
204
205 p->shared_irq_mask &= ~BIT(hw_irq);
206}
207
208static void intc_irqpin_shared_irq_disable(struct irq_data *d)
209{
210 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
211 int hw_irq = irqd_to_hwirq(d);
212
213 intc_irqpin_dbg(&p->irq[hw_irq], "shared disable");
214 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
215
216 p->shared_irq_mask |= BIT(hw_irq);
217}
218
219static void intc_irqpin_irq_enable_force(struct irq_data *d)
220{
221 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
222 int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
223
224 intc_irqpin_irq_enable(d);
225
226 /* enable interrupt through parent interrupt controller,
227 * assumes non-shared interrupt with 1:1 mapping
228 * needed for busted IRQs on some SoCs like sh73a0
229 */
230 irq_get_chip(irq)->irq_unmask(irq_get_irq_data(irq));
231}
232
233static void intc_irqpin_irq_disable_force(struct irq_data *d)
234{
235 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
236 int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
237
238 /* disable interrupt through parent interrupt controller,
239 * assumes non-shared interrupt with 1:1 mapping
240 * needed for busted IRQs on some SoCs like sh73a0
241 */
242 irq_get_chip(irq)->irq_mask(irq_get_irq_data(irq));
243 intc_irqpin_irq_disable(d);
244}
245
246#define INTC_IRQ_SENSE_VALID 0x10
247#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
248
249static unsigned char intc_irqpin_sense[IRQ_TYPE_SENSE_MASK + 1] = {
250 [IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x00),
251 [IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x01),
252 [IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x02),
253 [IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x03),
254 [IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x04),
255};
256
257static int intc_irqpin_irq_set_type(struct irq_data *d, unsigned int type)
258{
259 unsigned char value = intc_irqpin_sense[type & IRQ_TYPE_SENSE_MASK];
260 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
261
262 if (!(value & INTC_IRQ_SENSE_VALID))
263 return -EINVAL;
264
265 return intc_irqpin_set_sense(p, irqd_to_hwirq(d),
266 value ^ INTC_IRQ_SENSE_VALID);
267}
268
269static int intc_irqpin_irq_set_wake(struct irq_data *d, unsigned int on)
270{
271 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
272 int hw_irq = irqd_to_hwirq(d);
273
274 irq_set_irq_wake(p->irq[hw_irq].requested_irq, on);
275 if (on)
276 atomic_inc(&p->wakeup_path);
277 else
278 atomic_dec(&p->wakeup_path);
279
280 return 0;
281}
282
283static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
284{
285 struct intc_irqpin_irq *i = dev_id;
286 struct intc_irqpin_priv *p = i->p;
287 unsigned long bit;
288
289 intc_irqpin_dbg(i, "demux1");
290 bit = intc_irqpin_hwirq_mask(p, INTC_IRQPIN_REG_SOURCE, i->hw_irq);
291
292 if (intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE) & bit) {
293 intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, ~bit);
294 intc_irqpin_dbg(i, "demux2");
295 generic_handle_irq(i->domain_irq);
296 return IRQ_HANDLED;
297 }
298 return IRQ_NONE;
299}
300
301static irqreturn_t intc_irqpin_shared_irq_handler(int irq, void *dev_id)
302{
303 struct intc_irqpin_priv *p = dev_id;
304 unsigned int reg_source = intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE);
305 irqreturn_t status = IRQ_NONE;
306 int k;
307
308 for (k = 0; k < 8; k++) {
309 if (reg_source & BIT(7 - k)) {
310 if (BIT(k) & p->shared_irq_mask)
311 continue;
312
313 status |= intc_irqpin_irq_handler(irq, &p->irq[k]);
314 }
315 }
316
317 return status;
318}
319
320/*
321 * This lock class tells lockdep that INTC External IRQ Pin irqs are in a
322 * different category than their parents, so it won't report false recursion.
323 */
324static struct lock_class_key intc_irqpin_irq_lock_class;
325
326/* And this is for the request mutex */
327static struct lock_class_key intc_irqpin_irq_request_class;
328
329static int intc_irqpin_irq_domain_map(struct irq_domain *h, unsigned int virq,
330 irq_hw_number_t hw)
331{
332 struct intc_irqpin_priv *p = h->host_data;
333
334 p->irq[hw].domain_irq = virq;
335 p->irq[hw].hw_irq = hw;
336
337 intc_irqpin_dbg(&p->irq[hw], "map");
338 irq_set_chip_data(virq, h->host_data);
339 irq_set_lockdep_class(virq, &intc_irqpin_irq_lock_class,
340 &intc_irqpin_irq_request_class);
341 irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
342 return 0;
343}
344
345static const struct irq_domain_ops intc_irqpin_irq_domain_ops = {
346 .map = intc_irqpin_irq_domain_map,
347 .xlate = irq_domain_xlate_twocell,
348};
349
350static const struct intc_irqpin_config intc_irqpin_irlm_r8a777x = {
351 .irlm_bit = 23, /* ICR0.IRLM0 */
352 .needs_irlm = 1,
353};
354
355static const struct intc_irqpin_config intc_irqpin_rmobile = {
356 .needs_irlm = 0,
357};
358
359static const struct of_device_id intc_irqpin_dt_ids[] = {
360 { .compatible = "renesas,intc-irqpin", },
361 { .compatible = "renesas,intc-irqpin-r8a7778",
362 .data = &intc_irqpin_irlm_r8a777x },
363 { .compatible = "renesas,intc-irqpin-r8a7779",
364 .data = &intc_irqpin_irlm_r8a777x },
365 { .compatible = "renesas,intc-irqpin-r8a7740",
366 .data = &intc_irqpin_rmobile },
367 { .compatible = "renesas,intc-irqpin-sh73a0",
368 .data = &intc_irqpin_rmobile },
369 {},
370};
371MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
372
373static int intc_irqpin_probe(struct platform_device *pdev)
374{
375 const struct intc_irqpin_config *config;
376 struct device *dev = &pdev->dev;
377 struct intc_irqpin_priv *p;
378 struct intc_irqpin_iomem *i;
379 struct resource *io[INTC_IRQPIN_REG_NR];
380 struct resource *irq;
381 struct irq_chip *irq_chip;
382 void (*enable_fn)(struct irq_data *d);
383 void (*disable_fn)(struct irq_data *d);
384 const char *name = dev_name(dev);
385 bool control_parent;
386 unsigned int nirqs;
387 int ref_irq;
388 int ret;
389 int k;
390
391 p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
392 if (!p)
393 return -ENOMEM;
394
395 /* deal with driver instance configuration */
396 of_property_read_u32(dev->of_node, "sense-bitfield-width",
397 &p->sense_bitfield_width);
398 control_parent = of_property_read_bool(dev->of_node, "control-parent");
399 if (!p->sense_bitfield_width)
400 p->sense_bitfield_width = 4; /* default to 4 bits */
401
402 p->pdev = pdev;
403 platform_set_drvdata(pdev, p);
404
405 config = of_device_get_match_data(dev);
406
407 pm_runtime_enable(dev);
408 pm_runtime_get_sync(dev);
409
410 /* get hold of register banks */
411 memset(io, 0, sizeof(io));
412 for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
413 io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
414 if (!io[k] && k < INTC_IRQPIN_REG_NR_MANDATORY) {
415 dev_err(dev, "not enough IOMEM resources\n");
416 ret = -EINVAL;
417 goto err0;
418 }
419 }
420
421 /* allow any number of IRQs between 1 and INTC_IRQPIN_MAX */
422 for (k = 0; k < INTC_IRQPIN_MAX; k++) {
423 irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
424 if (!irq)
425 break;
426
427 p->irq[k].p = p;
428 p->irq[k].requested_irq = irq->start;
429 }
430
431 nirqs = k;
432 if (nirqs < 1) {
433 dev_err(dev, "not enough IRQ resources\n");
434 ret = -EINVAL;
435 goto err0;
436 }
437
438 /* ioremap IOMEM and setup read/write callbacks */
439 for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
440 i = &p->iomem[k];
441
442 /* handle optional registers */
443 if (!io[k])
444 continue;
445
446 switch (resource_size(io[k])) {
447 case 1:
448 i->width = 8;
449 i->read = intc_irqpin_read8;
450 i->write = intc_irqpin_write8;
451 break;
452 case 4:
453 i->width = 32;
454 i->read = intc_irqpin_read32;
455 i->write = intc_irqpin_write32;
456 break;
457 default:
458 dev_err(dev, "IOMEM size mismatch\n");
459 ret = -EINVAL;
460 goto err0;
461 }
462
463 i->iomem = devm_ioremap(dev, io[k]->start,
464 resource_size(io[k]));
465 if (!i->iomem) {
466 dev_err(dev, "failed to remap IOMEM\n");
467 ret = -ENXIO;
468 goto err0;
469 }
470 }
471
472 /* configure "individual IRQ mode" where needed */
473 if (config && config->needs_irlm) {
474 if (io[INTC_IRQPIN_REG_IRLM])
475 intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_IRLM,
476 config->irlm_bit, 1, 1);
477 else
478 dev_warn(dev, "unable to select IRLM mode\n");
479 }
480
481 /* mask all interrupts using priority */
482 for (k = 0; k < nirqs; k++)
483 intc_irqpin_mask_unmask_prio(p, k, 1);
484
485 /* clear all pending interrupts */
486 intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, 0x0);
487
488 /* scan for shared interrupt lines */
489 ref_irq = p->irq[0].requested_irq;
490 p->shared_irqs = 1;
491 for (k = 1; k < nirqs; k++) {
492 if (ref_irq != p->irq[k].requested_irq) {
493 p->shared_irqs = 0;
494 break;
495 }
496 }
497
498 /* use more severe masking method if requested */
499 if (control_parent) {
500 enable_fn = intc_irqpin_irq_enable_force;
501 disable_fn = intc_irqpin_irq_disable_force;
502 } else if (!p->shared_irqs) {
503 enable_fn = intc_irqpin_irq_enable;
504 disable_fn = intc_irqpin_irq_disable;
505 } else {
506 enable_fn = intc_irqpin_shared_irq_enable;
507 disable_fn = intc_irqpin_shared_irq_disable;
508 }
509
510 irq_chip = &p->irq_chip;
511 irq_chip->name = "intc-irqpin";
512 irq_chip->parent_device = dev;
513 irq_chip->irq_mask = disable_fn;
514 irq_chip->irq_unmask = enable_fn;
515 irq_chip->irq_set_type = intc_irqpin_irq_set_type;
516 irq_chip->irq_set_wake = intc_irqpin_irq_set_wake;
517 irq_chip->flags = IRQCHIP_MASK_ON_SUSPEND;
518
519 p->irq_domain = irq_domain_add_simple(dev->of_node, nirqs, 0,
520 &intc_irqpin_irq_domain_ops, p);
521 if (!p->irq_domain) {
522 ret = -ENXIO;
523 dev_err(dev, "cannot initialize irq domain\n");
524 goto err0;
525 }
526
527 if (p->shared_irqs) {
528 /* request one shared interrupt */
529 if (devm_request_irq(dev, p->irq[0].requested_irq,
530 intc_irqpin_shared_irq_handler,
531 IRQF_SHARED, name, p)) {
532 dev_err(dev, "failed to request low IRQ\n");
533 ret = -ENOENT;
534 goto err1;
535 }
536 } else {
537 /* request interrupts one by one */
538 for (k = 0; k < nirqs; k++) {
539 if (devm_request_irq(dev, p->irq[k].requested_irq,
540 intc_irqpin_irq_handler, 0, name,
541 &p->irq[k])) {
542 dev_err(dev, "failed to request low IRQ\n");
543 ret = -ENOENT;
544 goto err1;
545 }
546 }
547 }
548
549 /* unmask all interrupts on prio level */
550 for (k = 0; k < nirqs; k++)
551 intc_irqpin_mask_unmask_prio(p, k, 0);
552
553 dev_info(dev, "driving %d irqs\n", nirqs);
554
555 return 0;
556
557err1:
558 irq_domain_remove(p->irq_domain);
559err0:
560 pm_runtime_put(dev);
561 pm_runtime_disable(dev);
562 return ret;
563}
564
565static int intc_irqpin_remove(struct platform_device *pdev)
566{
567 struct intc_irqpin_priv *p = platform_get_drvdata(pdev);
568
569 irq_domain_remove(p->irq_domain);
570 pm_runtime_put(&pdev->dev);
571 pm_runtime_disable(&pdev->dev);
572 return 0;
573}
574
575static int __maybe_unused intc_irqpin_suspend(struct device *dev)
576{
577 struct intc_irqpin_priv *p = dev_get_drvdata(dev);
578
579 if (atomic_read(&p->wakeup_path))
580 device_set_wakeup_path(dev);
581
582 return 0;
583}
584
585static SIMPLE_DEV_PM_OPS(intc_irqpin_pm_ops, intc_irqpin_suspend, NULL);
586
587static struct platform_driver intc_irqpin_device_driver = {
588 .probe = intc_irqpin_probe,
589 .remove = intc_irqpin_remove,
590 .driver = {
591 .name = "renesas_intc_irqpin",
592 .of_match_table = intc_irqpin_dt_ids,
593 .pm = &intc_irqpin_pm_ops,
594 }
595};
596
597static int __init intc_irqpin_init(void)
598{
599 return platform_driver_register(&intc_irqpin_device_driver);
600}
601postcore_initcall(intc_irqpin_init);
602
603static void __exit intc_irqpin_exit(void)
604{
605 platform_driver_unregister(&intc_irqpin_device_driver);
606}
607module_exit(intc_irqpin_exit);
608
609MODULE_AUTHOR("Magnus Damm");
610MODULE_DESCRIPTION("Renesas INTC External IRQ Pin Driver");
611MODULE_LICENSE("GPL v2");
1/*
2 * Renesas INTC External IRQ Pin Driver
3 *
4 * Copyright (C) 2013 Magnus Damm
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
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/init.h>
21#include <linux/of.h>
22#include <linux/platform_device.h>
23#include <linux/spinlock.h>
24#include <linux/interrupt.h>
25#include <linux/ioport.h>
26#include <linux/io.h>
27#include <linux/irq.h>
28#include <linux/irqdomain.h>
29#include <linux/err.h>
30#include <linux/slab.h>
31#include <linux/module.h>
32#include <linux/platform_data/irq-renesas-intc-irqpin.h>
33
34#define INTC_IRQPIN_MAX 8 /* maximum 8 interrupts per driver instance */
35
36#define INTC_IRQPIN_REG_SENSE 0 /* ICRn */
37#define INTC_IRQPIN_REG_PRIO 1 /* INTPRInn */
38#define INTC_IRQPIN_REG_SOURCE 2 /* INTREQnn */
39#define INTC_IRQPIN_REG_MASK 3 /* INTMSKnn */
40#define INTC_IRQPIN_REG_CLEAR 4 /* INTMSKCLRnn */
41#define INTC_IRQPIN_REG_NR 5
42
43/* INTC external IRQ PIN hardware register access:
44 *
45 * SENSE is read-write 32-bit with 2-bits or 4-bits per IRQ (*)
46 * PRIO is read-write 32-bit with 4-bits per IRQ (**)
47 * SOURCE is read-only 32-bit or 8-bit with 1-bit per IRQ (***)
48 * MASK is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
49 * CLEAR is write-only 32-bit or 8-bit with 1-bit per IRQ (***)
50 *
51 * (*) May be accessed by more than one driver instance - lock needed
52 * (**) Read-modify-write access by one driver instance - lock needed
53 * (***) Accessed by one driver instance only - no locking needed
54 */
55
56struct intc_irqpin_iomem {
57 void __iomem *iomem;
58 unsigned long (*read)(void __iomem *iomem);
59 void (*write)(void __iomem *iomem, unsigned long data);
60 int width;
61};
62
63struct intc_irqpin_irq {
64 int hw_irq;
65 int requested_irq;
66 int domain_irq;
67 struct intc_irqpin_priv *p;
68};
69
70struct intc_irqpin_priv {
71 struct intc_irqpin_iomem iomem[INTC_IRQPIN_REG_NR];
72 struct intc_irqpin_irq irq[INTC_IRQPIN_MAX];
73 struct renesas_intc_irqpin_config config;
74 unsigned int number_of_irqs;
75 struct platform_device *pdev;
76 struct irq_chip irq_chip;
77 struct irq_domain *irq_domain;
78 bool shared_irqs;
79 u8 shared_irq_mask;
80};
81
82static unsigned long intc_irqpin_read32(void __iomem *iomem)
83{
84 return ioread32(iomem);
85}
86
87static unsigned long intc_irqpin_read8(void __iomem *iomem)
88{
89 return ioread8(iomem);
90}
91
92static void intc_irqpin_write32(void __iomem *iomem, unsigned long data)
93{
94 iowrite32(data, iomem);
95}
96
97static void intc_irqpin_write8(void __iomem *iomem, unsigned long data)
98{
99 iowrite8(data, iomem);
100}
101
102static inline unsigned long intc_irqpin_read(struct intc_irqpin_priv *p,
103 int reg)
104{
105 struct intc_irqpin_iomem *i = &p->iomem[reg];
106
107 return i->read(i->iomem);
108}
109
110static inline void intc_irqpin_write(struct intc_irqpin_priv *p,
111 int reg, unsigned long data)
112{
113 struct intc_irqpin_iomem *i = &p->iomem[reg];
114
115 i->write(i->iomem, data);
116}
117
118static inline unsigned long intc_irqpin_hwirq_mask(struct intc_irqpin_priv *p,
119 int reg, int hw_irq)
120{
121 return BIT((p->iomem[reg].width - 1) - hw_irq);
122}
123
124static inline void intc_irqpin_irq_write_hwirq(struct intc_irqpin_priv *p,
125 int reg, int hw_irq)
126{
127 intc_irqpin_write(p, reg, intc_irqpin_hwirq_mask(p, reg, hw_irq));
128}
129
130static DEFINE_RAW_SPINLOCK(intc_irqpin_lock); /* only used by slow path */
131
132static void intc_irqpin_read_modify_write(struct intc_irqpin_priv *p,
133 int reg, int shift,
134 int width, int value)
135{
136 unsigned long flags;
137 unsigned long tmp;
138
139 raw_spin_lock_irqsave(&intc_irqpin_lock, flags);
140
141 tmp = intc_irqpin_read(p, reg);
142 tmp &= ~(((1 << width) - 1) << shift);
143 tmp |= value << shift;
144 intc_irqpin_write(p, reg, tmp);
145
146 raw_spin_unlock_irqrestore(&intc_irqpin_lock, flags);
147}
148
149static void intc_irqpin_mask_unmask_prio(struct intc_irqpin_priv *p,
150 int irq, int do_mask)
151{
152 /* The PRIO register is assumed to be 32-bit with fixed 4-bit fields. */
153 int bitfield_width = 4;
154 int shift = 32 - (irq + 1) * bitfield_width;
155
156 intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_PRIO,
157 shift, bitfield_width,
158 do_mask ? 0 : (1 << bitfield_width) - 1);
159}
160
161static int intc_irqpin_set_sense(struct intc_irqpin_priv *p, int irq, int value)
162{
163 /* The SENSE register is assumed to be 32-bit. */
164 int bitfield_width = p->config.sense_bitfield_width;
165 int shift = 32 - (irq + 1) * bitfield_width;
166
167 dev_dbg(&p->pdev->dev, "sense irq = %d, mode = %d\n", irq, value);
168
169 if (value >= (1 << bitfield_width))
170 return -EINVAL;
171
172 intc_irqpin_read_modify_write(p, INTC_IRQPIN_REG_SENSE, shift,
173 bitfield_width, value);
174 return 0;
175}
176
177static void intc_irqpin_dbg(struct intc_irqpin_irq *i, char *str)
178{
179 dev_dbg(&i->p->pdev->dev, "%s (%d:%d:%d)\n",
180 str, i->requested_irq, i->hw_irq, i->domain_irq);
181}
182
183static void intc_irqpin_irq_enable(struct irq_data *d)
184{
185 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
186 int hw_irq = irqd_to_hwirq(d);
187
188 intc_irqpin_dbg(&p->irq[hw_irq], "enable");
189 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
190}
191
192static void intc_irqpin_irq_disable(struct irq_data *d)
193{
194 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
195 int hw_irq = irqd_to_hwirq(d);
196
197 intc_irqpin_dbg(&p->irq[hw_irq], "disable");
198 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
199}
200
201static void intc_irqpin_shared_irq_enable(struct irq_data *d)
202{
203 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
204 int hw_irq = irqd_to_hwirq(d);
205
206 intc_irqpin_dbg(&p->irq[hw_irq], "shared enable");
207 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_CLEAR, hw_irq);
208
209 p->shared_irq_mask &= ~BIT(hw_irq);
210}
211
212static void intc_irqpin_shared_irq_disable(struct irq_data *d)
213{
214 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
215 int hw_irq = irqd_to_hwirq(d);
216
217 intc_irqpin_dbg(&p->irq[hw_irq], "shared disable");
218 intc_irqpin_irq_write_hwirq(p, INTC_IRQPIN_REG_MASK, hw_irq);
219
220 p->shared_irq_mask |= BIT(hw_irq);
221}
222
223static void intc_irqpin_irq_enable_force(struct irq_data *d)
224{
225 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
226 int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
227
228 intc_irqpin_irq_enable(d);
229
230 /* enable interrupt through parent interrupt controller,
231 * assumes non-shared interrupt with 1:1 mapping
232 * needed for busted IRQs on some SoCs like sh73a0
233 */
234 irq_get_chip(irq)->irq_unmask(irq_get_irq_data(irq));
235}
236
237static void intc_irqpin_irq_disable_force(struct irq_data *d)
238{
239 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
240 int irq = p->irq[irqd_to_hwirq(d)].requested_irq;
241
242 /* disable interrupt through parent interrupt controller,
243 * assumes non-shared interrupt with 1:1 mapping
244 * needed for busted IRQs on some SoCs like sh73a0
245 */
246 irq_get_chip(irq)->irq_mask(irq_get_irq_data(irq));
247 intc_irqpin_irq_disable(d);
248}
249
250#define INTC_IRQ_SENSE_VALID 0x10
251#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
252
253static unsigned char intc_irqpin_sense[IRQ_TYPE_SENSE_MASK + 1] = {
254 [IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x00),
255 [IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x01),
256 [IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x02),
257 [IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x03),
258 [IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x04),
259};
260
261static int intc_irqpin_irq_set_type(struct irq_data *d, unsigned int type)
262{
263 unsigned char value = intc_irqpin_sense[type & IRQ_TYPE_SENSE_MASK];
264 struct intc_irqpin_priv *p = irq_data_get_irq_chip_data(d);
265
266 if (!(value & INTC_IRQ_SENSE_VALID))
267 return -EINVAL;
268
269 return intc_irqpin_set_sense(p, irqd_to_hwirq(d),
270 value ^ INTC_IRQ_SENSE_VALID);
271}
272
273static irqreturn_t intc_irqpin_irq_handler(int irq, void *dev_id)
274{
275 struct intc_irqpin_irq *i = dev_id;
276 struct intc_irqpin_priv *p = i->p;
277 unsigned long bit;
278
279 intc_irqpin_dbg(i, "demux1");
280 bit = intc_irqpin_hwirq_mask(p, INTC_IRQPIN_REG_SOURCE, i->hw_irq);
281
282 if (intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE) & bit) {
283 intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, ~bit);
284 intc_irqpin_dbg(i, "demux2");
285 generic_handle_irq(i->domain_irq);
286 return IRQ_HANDLED;
287 }
288 return IRQ_NONE;
289}
290
291static irqreturn_t intc_irqpin_shared_irq_handler(int irq, void *dev_id)
292{
293 struct intc_irqpin_priv *p = dev_id;
294 unsigned int reg_source = intc_irqpin_read(p, INTC_IRQPIN_REG_SOURCE);
295 irqreturn_t status = IRQ_NONE;
296 int k;
297
298 for (k = 0; k < 8; k++) {
299 if (reg_source & BIT(7 - k)) {
300 if (BIT(k) & p->shared_irq_mask)
301 continue;
302
303 status |= intc_irqpin_irq_handler(irq, &p->irq[k]);
304 }
305 }
306
307 return status;
308}
309
310static int intc_irqpin_irq_domain_map(struct irq_domain *h, unsigned int virq,
311 irq_hw_number_t hw)
312{
313 struct intc_irqpin_priv *p = h->host_data;
314
315 p->irq[hw].domain_irq = virq;
316 p->irq[hw].hw_irq = hw;
317
318 intc_irqpin_dbg(&p->irq[hw], "map");
319 irq_set_chip_data(virq, h->host_data);
320 irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
321 set_irq_flags(virq, IRQF_VALID); /* kill me now */
322 return 0;
323}
324
325static struct irq_domain_ops intc_irqpin_irq_domain_ops = {
326 .map = intc_irqpin_irq_domain_map,
327 .xlate = irq_domain_xlate_twocell,
328};
329
330static int intc_irqpin_probe(struct platform_device *pdev)
331{
332 struct renesas_intc_irqpin_config *pdata = pdev->dev.platform_data;
333 struct intc_irqpin_priv *p;
334 struct intc_irqpin_iomem *i;
335 struct resource *io[INTC_IRQPIN_REG_NR];
336 struct resource *irq;
337 struct irq_chip *irq_chip;
338 void (*enable_fn)(struct irq_data *d);
339 void (*disable_fn)(struct irq_data *d);
340 const char *name = dev_name(&pdev->dev);
341 int ref_irq;
342 int ret;
343 int k;
344
345 p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
346 if (!p) {
347 dev_err(&pdev->dev, "failed to allocate driver data\n");
348 ret = -ENOMEM;
349 goto err0;
350 }
351
352 /* deal with driver instance configuration */
353 if (pdata) {
354 memcpy(&p->config, pdata, sizeof(*pdata));
355 } else {
356 of_property_read_u32(pdev->dev.of_node, "sense-bitfield-width",
357 &p->config.sense_bitfield_width);
358 p->config.control_parent = of_property_read_bool(pdev->dev.of_node,
359 "control-parent");
360 }
361 if (!p->config.sense_bitfield_width)
362 p->config.sense_bitfield_width = 4; /* default to 4 bits */
363
364 p->pdev = pdev;
365 platform_set_drvdata(pdev, p);
366
367 /* get hold of manadatory IOMEM */
368 for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
369 io[k] = platform_get_resource(pdev, IORESOURCE_MEM, k);
370 if (!io[k]) {
371 dev_err(&pdev->dev, "not enough IOMEM resources\n");
372 ret = -EINVAL;
373 goto err0;
374 }
375 }
376
377 /* allow any number of IRQs between 1 and INTC_IRQPIN_MAX */
378 for (k = 0; k < INTC_IRQPIN_MAX; k++) {
379 irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
380 if (!irq)
381 break;
382
383 p->irq[k].p = p;
384 p->irq[k].requested_irq = irq->start;
385 }
386
387 p->number_of_irqs = k;
388 if (p->number_of_irqs < 1) {
389 dev_err(&pdev->dev, "not enough IRQ resources\n");
390 ret = -EINVAL;
391 goto err0;
392 }
393
394 /* ioremap IOMEM and setup read/write callbacks */
395 for (k = 0; k < INTC_IRQPIN_REG_NR; k++) {
396 i = &p->iomem[k];
397
398 switch (resource_size(io[k])) {
399 case 1:
400 i->width = 8;
401 i->read = intc_irqpin_read8;
402 i->write = intc_irqpin_write8;
403 break;
404 case 4:
405 i->width = 32;
406 i->read = intc_irqpin_read32;
407 i->write = intc_irqpin_write32;
408 break;
409 default:
410 dev_err(&pdev->dev, "IOMEM size mismatch\n");
411 ret = -EINVAL;
412 goto err0;
413 }
414
415 i->iomem = devm_ioremap_nocache(&pdev->dev, io[k]->start,
416 resource_size(io[k]));
417 if (!i->iomem) {
418 dev_err(&pdev->dev, "failed to remap IOMEM\n");
419 ret = -ENXIO;
420 goto err0;
421 }
422 }
423
424 /* mask all interrupts using priority */
425 for (k = 0; k < p->number_of_irqs; k++)
426 intc_irqpin_mask_unmask_prio(p, k, 1);
427
428 /* clear all pending interrupts */
429 intc_irqpin_write(p, INTC_IRQPIN_REG_SOURCE, 0x0);
430
431 /* scan for shared interrupt lines */
432 ref_irq = p->irq[0].requested_irq;
433 p->shared_irqs = true;
434 for (k = 1; k < p->number_of_irqs; k++) {
435 if (ref_irq != p->irq[k].requested_irq) {
436 p->shared_irqs = false;
437 break;
438 }
439 }
440
441 /* use more severe masking method if requested */
442 if (p->config.control_parent) {
443 enable_fn = intc_irqpin_irq_enable_force;
444 disable_fn = intc_irqpin_irq_disable_force;
445 } else if (!p->shared_irqs) {
446 enable_fn = intc_irqpin_irq_enable;
447 disable_fn = intc_irqpin_irq_disable;
448 } else {
449 enable_fn = intc_irqpin_shared_irq_enable;
450 disable_fn = intc_irqpin_shared_irq_disable;
451 }
452
453 irq_chip = &p->irq_chip;
454 irq_chip->name = name;
455 irq_chip->irq_mask = disable_fn;
456 irq_chip->irq_unmask = enable_fn;
457 irq_chip->irq_enable = enable_fn;
458 irq_chip->irq_disable = disable_fn;
459 irq_chip->irq_set_type = intc_irqpin_irq_set_type;
460 irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
461
462 p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
463 p->number_of_irqs,
464 p->config.irq_base,
465 &intc_irqpin_irq_domain_ops, p);
466 if (!p->irq_domain) {
467 ret = -ENXIO;
468 dev_err(&pdev->dev, "cannot initialize irq domain\n");
469 goto err0;
470 }
471
472 if (p->shared_irqs) {
473 /* request one shared interrupt */
474 if (devm_request_irq(&pdev->dev, p->irq[0].requested_irq,
475 intc_irqpin_shared_irq_handler,
476 IRQF_SHARED, name, p)) {
477 dev_err(&pdev->dev, "failed to request low IRQ\n");
478 ret = -ENOENT;
479 goto err1;
480 }
481 } else {
482 /* request interrupts one by one */
483 for (k = 0; k < p->number_of_irqs; k++) {
484 if (devm_request_irq(&pdev->dev,
485 p->irq[k].requested_irq,
486 intc_irqpin_irq_handler,
487 0, name, &p->irq[k])) {
488 dev_err(&pdev->dev,
489 "failed to request low IRQ\n");
490 ret = -ENOENT;
491 goto err1;
492 }
493 }
494 }
495
496 /* unmask all interrupts on prio level */
497 for (k = 0; k < p->number_of_irqs; k++)
498 intc_irqpin_mask_unmask_prio(p, k, 0);
499
500 dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
501
502 /* warn in case of mismatch if irq base is specified */
503 if (p->config.irq_base) {
504 if (p->config.irq_base != p->irq[0].domain_irq)
505 dev_warn(&pdev->dev, "irq base mismatch (%d/%d)\n",
506 p->config.irq_base, p->irq[0].domain_irq);
507 }
508
509 return 0;
510
511err1:
512 irq_domain_remove(p->irq_domain);
513err0:
514 return ret;
515}
516
517static int intc_irqpin_remove(struct platform_device *pdev)
518{
519 struct intc_irqpin_priv *p = platform_get_drvdata(pdev);
520
521 irq_domain_remove(p->irq_domain);
522
523 return 0;
524}
525
526static const struct of_device_id intc_irqpin_dt_ids[] = {
527 { .compatible = "renesas,intc-irqpin", },
528 {},
529};
530MODULE_DEVICE_TABLE(of, intc_irqpin_dt_ids);
531
532static struct platform_driver intc_irqpin_device_driver = {
533 .probe = intc_irqpin_probe,
534 .remove = intc_irqpin_remove,
535 .driver = {
536 .name = "renesas_intc_irqpin",
537 .of_match_table = intc_irqpin_dt_ids,
538 .owner = THIS_MODULE,
539 }
540};
541
542static int __init intc_irqpin_init(void)
543{
544 return platform_driver_register(&intc_irqpin_device_driver);
545}
546postcore_initcall(intc_irqpin_init);
547
548static void __exit intc_irqpin_exit(void)
549{
550 platform_driver_unregister(&intc_irqpin_device_driver);
551}
552module_exit(intc_irqpin_exit);
553
554MODULE_AUTHOR("Magnus Damm");
555MODULE_DESCRIPTION("Renesas INTC External IRQ Pin Driver");
556MODULE_LICENSE("GPL v2");