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