xref: /openbmc/linux/drivers/irqchip/irq-mmp.c (revision ae213c44) 
1 /*
2  *  linux/arch/arm/mach-mmp/irq.c
3  *
4  *  Generic IRQ handling, GPIO IRQ demultiplexing, etc.
5  *  Copyright (C) 2008 - 2012 Marvell Technology Group Ltd.
6  *
7  *  Author:	Bin Yang <bin.yang@marvell.com>
8  *              Haojian Zhuang <haojian.zhuang@gmail.com>
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  */
14 
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/irq.h>
18 #include <linux/irqchip.h>
19 #include <linux/irqdomain.h>
20 #include <linux/io.h>
21 #include <linux/ioport.h>
22 #include <linux/of_address.h>
23 #include <linux/of_irq.h>
24 
25 #include <asm/exception.h>
26 #include <asm/hardirq.h>
27 
28 #define MAX_ICU_NR		16
29 
30 #define PJ1_INT_SEL		0x10c
31 #define PJ4_INT_SEL		0x104
32 
33 /* bit fields in PJ1_INT_SEL and PJ4_INT_SEL */
34 #define SEL_INT_PENDING		(1 << 6)
35 #define SEL_INT_NUM_MASK	0x3f
36 
37 #define MMP2_ICU_INT_ROUTE_PJ4_IRQ	(1 << 5)
38 #define MMP2_ICU_INT_ROUTE_PJ4_FIQ	(1 << 6)
39 
40 struct icu_chip_data {
41 	int			nr_irqs;
42 	unsigned int		virq_base;
43 	unsigned int		cascade_irq;
44 	void __iomem		*reg_status;
45 	void __iomem		*reg_mask;
46 	unsigned int		conf_enable;
47 	unsigned int		conf_disable;
48 	unsigned int		conf_mask;
49 	unsigned int		clr_mfp_irq_base;
50 	unsigned int		clr_mfp_hwirq;
51 	struct irq_domain	*domain;
52 };
53 
54 struct mmp_intc_conf {
55 	unsigned int	conf_enable;
56 	unsigned int	conf_disable;
57 	unsigned int	conf_mask;
58 };
59 
60 static void __iomem *mmp_icu_base;
61 static struct icu_chip_data icu_data[MAX_ICU_NR];
62 static int max_icu_nr;
63 
64 extern void mmp2_clear_pmic_int(void);
65 
66 static void icu_mask_ack_irq(struct irq_data *d)
67 {
68 	struct irq_domain *domain = d->domain;
69 	struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
70 	int hwirq;
71 	u32 r;
72 
73 	hwirq = d->irq - data->virq_base;
74 	if (data == &icu_data[0]) {
75 		r = readl_relaxed(mmp_icu_base + (hwirq << 2));
76 		r &= ~data->conf_mask;
77 		r |= data->conf_disable;
78 		writel_relaxed(r, mmp_icu_base + (hwirq << 2));
79 	} else {
80 #ifdef CONFIG_CPU_MMP2
81 		if ((data->virq_base == data->clr_mfp_irq_base)
82 			&& (hwirq == data->clr_mfp_hwirq))
83 			mmp2_clear_pmic_int();
84 #endif
85 		r = readl_relaxed(data->reg_mask) | (1 << hwirq);
86 		writel_relaxed(r, data->reg_mask);
87 	}
88 }
89 
90 static void icu_mask_irq(struct irq_data *d)
91 {
92 	struct irq_domain *domain = d->domain;
93 	struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
94 	int hwirq;
95 	u32 r;
96 
97 	hwirq = d->irq - data->virq_base;
98 	if (data == &icu_data[0]) {
99 		r = readl_relaxed(mmp_icu_base + (hwirq << 2));
100 		r &= ~data->conf_mask;
101 		r |= data->conf_disable;
102 		writel_relaxed(r, mmp_icu_base + (hwirq << 2));
103 	} else {
104 		r = readl_relaxed(data->reg_mask) | (1 << hwirq);
105 		writel_relaxed(r, data->reg_mask);
106 	}
107 }
108 
109 static void icu_unmask_irq(struct irq_data *d)
110 {
111 	struct irq_domain *domain = d->domain;
112 	struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
113 	int hwirq;
114 	u32 r;
115 
116 	hwirq = d->irq - data->virq_base;
117 	if (data == &icu_data[0]) {
118 		r = readl_relaxed(mmp_icu_base + (hwirq << 2));
119 		r &= ~data->conf_mask;
120 		r |= data->conf_enable;
121 		writel_relaxed(r, mmp_icu_base + (hwirq << 2));
122 	} else {
123 		r = readl_relaxed(data->reg_mask) & ~(1 << hwirq);
124 		writel_relaxed(r, data->reg_mask);
125 	}
126 }
127 
128 struct irq_chip icu_irq_chip = {
129 	.name		= "icu_irq",
130 	.irq_mask	= icu_mask_irq,
131 	.irq_mask_ack	= icu_mask_ack_irq,
132 	.irq_unmask	= icu_unmask_irq,
133 };
134 
135 static void icu_mux_irq_demux(struct irq_desc *desc)
136 {
137 	unsigned int irq = irq_desc_get_irq(desc);
138 	struct irq_domain *domain;
139 	struct icu_chip_data *data;
140 	int i;
141 	unsigned long mask, status, n;
142 
143 	for (i = 1; i < max_icu_nr; i++) {
144 		if (irq == icu_data[i].cascade_irq) {
145 			domain = icu_data[i].domain;
146 			data = (struct icu_chip_data *)domain->host_data;
147 			break;
148 		}
149 	}
150 	if (i >= max_icu_nr) {
151 		pr_err("Spurious irq %d in MMP INTC\n", irq);
152 		return;
153 	}
154 
155 	mask = readl_relaxed(data->reg_mask);
156 	while (1) {
157 		status = readl_relaxed(data->reg_status) & ~mask;
158 		if (status == 0)
159 			break;
160 		for_each_set_bit(n, &status, BITS_PER_LONG) {
161 			generic_handle_irq(icu_data[i].virq_base + n);
162 		}
163 	}
164 }
165 
166 static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq,
167 			      irq_hw_number_t hw)
168 {
169 	irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
170 	return 0;
171 }
172 
173 static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
174 				const u32 *intspec, unsigned int intsize,
175 				unsigned long *out_hwirq,
176 				unsigned int *out_type)
177 {
178 	*out_hwirq = intspec[0];
179 	return 0;
180 }
181 
182 static const struct irq_domain_ops mmp_irq_domain_ops = {
183 	.map		= mmp_irq_domain_map,
184 	.xlate		= mmp_irq_domain_xlate,
185 };
186 
187 static const struct mmp_intc_conf mmp_conf = {
188 	.conf_enable	= 0x51,
189 	.conf_disable	= 0x0,
190 	.conf_mask	= 0x7f,
191 };
192 
193 static const struct mmp_intc_conf mmp2_conf = {
194 	.conf_enable	= 0x20,
195 	.conf_disable	= 0x0,
196 	.conf_mask	= MMP2_ICU_INT_ROUTE_PJ4_IRQ |
197 			  MMP2_ICU_INT_ROUTE_PJ4_FIQ,
198 };
199 
200 static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)
201 {
202 	int hwirq;
203 
204 	hwirq = readl_relaxed(mmp_icu_base + PJ1_INT_SEL);
205 	if (!(hwirq & SEL_INT_PENDING))
206 		return;
207 	hwirq &= SEL_INT_NUM_MASK;
208 	handle_domain_irq(icu_data[0].domain, hwirq, regs);
209 }
210 
211 static void __exception_irq_entry mmp2_handle_irq(struct pt_regs *regs)
212 {
213 	int hwirq;
214 
215 	hwirq = readl_relaxed(mmp_icu_base + PJ4_INT_SEL);
216 	if (!(hwirq & SEL_INT_PENDING))
217 		return;
218 	hwirq &= SEL_INT_NUM_MASK;
219 	handle_domain_irq(icu_data[0].domain, hwirq, regs);
220 }
221 
222 /* MMP (ARMv5) */
223 void __init icu_init_irq(void)
224 {
225 	int irq;
226 
227 	max_icu_nr = 1;
228 	mmp_icu_base = ioremap(0xd4282000, 0x1000);
229 	icu_data[0].conf_enable = mmp_conf.conf_enable;
230 	icu_data[0].conf_disable = mmp_conf.conf_disable;
231 	icu_data[0].conf_mask = mmp_conf.conf_mask;
232 	icu_data[0].nr_irqs = 64;
233 	icu_data[0].virq_base = 0;
234 	icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
235 						   &irq_domain_simple_ops,
236 						   &icu_data[0]);
237 	for (irq = 0; irq < 64; irq++) {
238 		icu_mask_irq(irq_get_irq_data(irq));
239 		irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
240 	}
241 	irq_set_default_host(icu_data[0].domain);
242 	set_handle_irq(mmp_handle_irq);
243 }
244 
245 /* MMP2 (ARMv7) */
246 void __init mmp2_init_icu(void)
247 {
248 	int irq, end;
249 
250 	max_icu_nr = 8;
251 	mmp_icu_base = ioremap(0xd4282000, 0x1000);
252 	icu_data[0].conf_enable = mmp2_conf.conf_enable;
253 	icu_data[0].conf_disable = mmp2_conf.conf_disable;
254 	icu_data[0].conf_mask = mmp2_conf.conf_mask;
255 	icu_data[0].nr_irqs = 64;
256 	icu_data[0].virq_base = 0;
257 	icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
258 						   &irq_domain_simple_ops,
259 						   &icu_data[0]);
260 	icu_data[1].reg_status = mmp_icu_base + 0x150;
261 	icu_data[1].reg_mask = mmp_icu_base + 0x168;
262 	icu_data[1].clr_mfp_irq_base = icu_data[0].virq_base +
263 				icu_data[0].nr_irqs;
264 	icu_data[1].clr_mfp_hwirq = 1;		/* offset to IRQ_MMP2_PMIC_BASE */
265 	icu_data[1].nr_irqs = 2;
266 	icu_data[1].cascade_irq = 4;
267 	icu_data[1].virq_base = icu_data[0].virq_base + icu_data[0].nr_irqs;
268 	icu_data[1].domain = irq_domain_add_legacy(NULL, icu_data[1].nr_irqs,
269 						   icu_data[1].virq_base, 0,
270 						   &irq_domain_simple_ops,
271 						   &icu_data[1]);
272 	icu_data[2].reg_status = mmp_icu_base + 0x154;
273 	icu_data[2].reg_mask = mmp_icu_base + 0x16c;
274 	icu_data[2].nr_irqs = 2;
275 	icu_data[2].cascade_irq = 5;
276 	icu_data[2].virq_base = icu_data[1].virq_base + icu_data[1].nr_irqs;
277 	icu_data[2].domain = irq_domain_add_legacy(NULL, icu_data[2].nr_irqs,
278 						   icu_data[2].virq_base, 0,
279 						   &irq_domain_simple_ops,
280 						   &icu_data[2]);
281 	icu_data[3].reg_status = mmp_icu_base + 0x180;
282 	icu_data[3].reg_mask = mmp_icu_base + 0x17c;
283 	icu_data[3].nr_irqs = 3;
284 	icu_data[3].cascade_irq = 9;
285 	icu_data[3].virq_base = icu_data[2].virq_base + icu_data[2].nr_irqs;
286 	icu_data[3].domain = irq_domain_add_legacy(NULL, icu_data[3].nr_irqs,
287 						   icu_data[3].virq_base, 0,
288 						   &irq_domain_simple_ops,
289 						   &icu_data[3]);
290 	icu_data[4].reg_status = mmp_icu_base + 0x158;
291 	icu_data[4].reg_mask = mmp_icu_base + 0x170;
292 	icu_data[4].nr_irqs = 5;
293 	icu_data[4].cascade_irq = 17;
294 	icu_data[4].virq_base = icu_data[3].virq_base + icu_data[3].nr_irqs;
295 	icu_data[4].domain = irq_domain_add_legacy(NULL, icu_data[4].nr_irqs,
296 						   icu_data[4].virq_base, 0,
297 						   &irq_domain_simple_ops,
298 						   &icu_data[4]);
299 	icu_data[5].reg_status = mmp_icu_base + 0x15c;
300 	icu_data[5].reg_mask = mmp_icu_base + 0x174;
301 	icu_data[5].nr_irqs = 15;
302 	icu_data[5].cascade_irq = 35;
303 	icu_data[5].virq_base = icu_data[4].virq_base + icu_data[4].nr_irqs;
304 	icu_data[5].domain = irq_domain_add_legacy(NULL, icu_data[5].nr_irqs,
305 						   icu_data[5].virq_base, 0,
306 						   &irq_domain_simple_ops,
307 						   &icu_data[5]);
308 	icu_data[6].reg_status = mmp_icu_base + 0x160;
309 	icu_data[6].reg_mask = mmp_icu_base + 0x178;
310 	icu_data[6].nr_irqs = 2;
311 	icu_data[6].cascade_irq = 51;
312 	icu_data[6].virq_base = icu_data[5].virq_base + icu_data[5].nr_irqs;
313 	icu_data[6].domain = irq_domain_add_legacy(NULL, icu_data[6].nr_irqs,
314 						   icu_data[6].virq_base, 0,
315 						   &irq_domain_simple_ops,
316 						   &icu_data[6]);
317 	icu_data[7].reg_status = mmp_icu_base + 0x188;
318 	icu_data[7].reg_mask = mmp_icu_base + 0x184;
319 	icu_data[7].nr_irqs = 2;
320 	icu_data[7].cascade_irq = 55;
321 	icu_data[7].virq_base = icu_data[6].virq_base + icu_data[6].nr_irqs;
322 	icu_data[7].domain = irq_domain_add_legacy(NULL, icu_data[7].nr_irqs,
323 						   icu_data[7].virq_base, 0,
324 						   &irq_domain_simple_ops,
325 						   &icu_data[7]);
326 	end = icu_data[7].virq_base + icu_data[7].nr_irqs;
327 	for (irq = 0; irq < end; irq++) {
328 		icu_mask_irq(irq_get_irq_data(irq));
329 		if (irq == icu_data[1].cascade_irq ||
330 		    irq == icu_data[2].cascade_irq ||
331 		    irq == icu_data[3].cascade_irq ||
332 		    irq == icu_data[4].cascade_irq ||
333 		    irq == icu_data[5].cascade_irq ||
334 		    irq == icu_data[6].cascade_irq ||
335 		    irq == icu_data[7].cascade_irq) {
336 			irq_set_chip(irq, &icu_irq_chip);
337 			irq_set_chained_handler(irq, icu_mux_irq_demux);
338 		} else {
339 			irq_set_chip_and_handler(irq, &icu_irq_chip,
340 						 handle_level_irq);
341 		}
342 	}
343 	irq_set_default_host(icu_data[0].domain);
344 	set_handle_irq(mmp2_handle_irq);
345 }
346 
347 #ifdef CONFIG_OF
348 static int __init mmp_init_bases(struct device_node *node)
349 {
350 	int ret, nr_irqs, irq, i = 0;
351 
352 	ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
353 	if (ret) {
354 		pr_err("Not found mrvl,intc-nr-irqs property\n");
355 		return ret;
356 	}
357 
358 	mmp_icu_base = of_iomap(node, 0);
359 	if (!mmp_icu_base) {
360 		pr_err("Failed to get interrupt controller register\n");
361 		return -ENOMEM;
362 	}
363 
364 	icu_data[0].virq_base = 0;
365 	icu_data[0].domain = irq_domain_add_linear(node, nr_irqs,
366 						   &mmp_irq_domain_ops,
367 						   &icu_data[0]);
368 	for (irq = 0; irq < nr_irqs; irq++) {
369 		ret = irq_create_mapping(icu_data[0].domain, irq);
370 		if (!ret) {
371 			pr_err("Failed to mapping hwirq\n");
372 			goto err;
373 		}
374 		if (!irq)
375 			icu_data[0].virq_base = ret;
376 	}
377 	icu_data[0].nr_irqs = nr_irqs;
378 	return 0;
379 err:
380 	if (icu_data[0].virq_base) {
381 		for (i = 0; i < irq; i++)
382 			irq_dispose_mapping(icu_data[0].virq_base + i);
383 	}
384 	irq_domain_remove(icu_data[0].domain);
385 	iounmap(mmp_icu_base);
386 	return -EINVAL;
387 }
388 
389 static int __init mmp_of_init(struct device_node *node,
390 			      struct device_node *parent)
391 {
392 	int ret;
393 
394 	ret = mmp_init_bases(node);
395 	if (ret < 0)
396 		return ret;
397 
398 	icu_data[0].conf_enable = mmp_conf.conf_enable;
399 	icu_data[0].conf_disable = mmp_conf.conf_disable;
400 	icu_data[0].conf_mask = mmp_conf.conf_mask;
401 	irq_set_default_host(icu_data[0].domain);
402 	set_handle_irq(mmp_handle_irq);
403 	max_icu_nr = 1;
404 	return 0;
405 }
406 IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init);
407 
408 static int __init mmp2_of_init(struct device_node *node,
409 			       struct device_node *parent)
410 {
411 	int ret;
412 
413 	ret = mmp_init_bases(node);
414 	if (ret < 0)
415 		return ret;
416 
417 	icu_data[0].conf_enable = mmp2_conf.conf_enable;
418 	icu_data[0].conf_disable = mmp2_conf.conf_disable;
419 	icu_data[0].conf_mask = mmp2_conf.conf_mask;
420 	irq_set_default_host(icu_data[0].domain);
421 	set_handle_irq(mmp2_handle_irq);
422 	max_icu_nr = 1;
423 	return 0;
424 }
425 IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init);
426 
427 static int __init mmp2_mux_of_init(struct device_node *node,
428 				   struct device_node *parent)
429 {
430 	struct resource res;
431 	int i, ret, irq, j = 0;
432 	u32 nr_irqs, mfp_irq;
433 
434 	if (!parent)
435 		return -ENODEV;
436 
437 	i = max_icu_nr;
438 	ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
439 				   &nr_irqs);
440 	if (ret) {
441 		pr_err("Not found mrvl,intc-nr-irqs property\n");
442 		return -EINVAL;
443 	}
444 	ret = of_address_to_resource(node, 0, &res);
445 	if (ret < 0) {
446 		pr_err("Not found reg property\n");
447 		return -EINVAL;
448 	}
449 	icu_data[i].reg_status = mmp_icu_base + res.start;
450 	ret = of_address_to_resource(node, 1, &res);
451 	if (ret < 0) {
452 		pr_err("Not found reg property\n");
453 		return -EINVAL;
454 	}
455 	icu_data[i].reg_mask = mmp_icu_base + res.start;
456 	icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
457 	if (!icu_data[i].cascade_irq)
458 		return -EINVAL;
459 
460 	icu_data[i].virq_base = 0;
461 	icu_data[i].domain = irq_domain_add_linear(node, nr_irqs,
462 						   &mmp_irq_domain_ops,
463 						   &icu_data[i]);
464 	for (irq = 0; irq < nr_irqs; irq++) {
465 		ret = irq_create_mapping(icu_data[i].domain, irq);
466 		if (!ret) {
467 			pr_err("Failed to mapping hwirq\n");
468 			goto err;
469 		}
470 		if (!irq)
471 			icu_data[i].virq_base = ret;
472 	}
473 	icu_data[i].nr_irqs = nr_irqs;
474 	if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
475 				  &mfp_irq)) {
476 		icu_data[i].clr_mfp_irq_base = icu_data[i].virq_base;
477 		icu_data[i].clr_mfp_hwirq = mfp_irq;
478 	}
479 	irq_set_chained_handler(icu_data[i].cascade_irq,
480 				icu_mux_irq_demux);
481 	max_icu_nr++;
482 	return 0;
483 err:
484 	if (icu_data[i].virq_base) {
485 		for (j = 0; j < irq; j++)
486 			irq_dispose_mapping(icu_data[i].virq_base + j);
487 	}
488 	irq_domain_remove(icu_data[i].domain);
489 	return -EINVAL;
490 }
491 IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init);
492 #endif
493