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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/irqdomain.h>
19#include <linux/io.h>
20#include <linux/ioport.h>
21#include <linux/of_address.h>
22#include <linux/of_irq.h>
23
24#include <asm/exception.h>
25#include <asm/hardirq.h>
26
27#include "irqchip.h"
28
29#define MAX_ICU_NR 16
30
31#define PJ1_INT_SEL 0x10c
32#define PJ4_INT_SEL 0x104
33
34/* bit fields in PJ1_INT_SEL and PJ4_INT_SEL */
35#define SEL_INT_PENDING (1 << 6)
36#define SEL_INT_NUM_MASK 0x3f
37
38struct icu_chip_data {
39 int nr_irqs;
40 unsigned int virq_base;
41 unsigned int cascade_irq;
42 void __iomem *reg_status;
43 void __iomem *reg_mask;
44 unsigned int conf_enable;
45 unsigned int conf_disable;
46 unsigned int conf_mask;
47 unsigned int clr_mfp_irq_base;
48 unsigned int clr_mfp_hwirq;
49 struct irq_domain *domain;
50};
51
52struct mmp_intc_conf {
53 unsigned int conf_enable;
54 unsigned int conf_disable;
55 unsigned int conf_mask;
56};
57
58static void __iomem *mmp_icu_base;
59static struct icu_chip_data icu_data[MAX_ICU_NR];
60static int max_icu_nr;
61
62extern void mmp2_clear_pmic_int(void);
63
64static void icu_mask_ack_irq(struct irq_data *d)
65{
66 struct irq_domain *domain = d->domain;
67 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
68 int hwirq;
69 u32 r;
70
71 hwirq = d->irq - data->virq_base;
72 if (data == &icu_data[0]) {
73 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
74 r &= ~data->conf_mask;
75 r |= data->conf_disable;
76 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
77 } else {
78#ifdef CONFIG_CPU_MMP2
79 if ((data->virq_base == data->clr_mfp_irq_base)
80 && (hwirq == data->clr_mfp_hwirq))
81 mmp2_clear_pmic_int();
82#endif
83 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
84 writel_relaxed(r, data->reg_mask);
85 }
86}
87
88static void icu_mask_irq(struct irq_data *d)
89{
90 struct irq_domain *domain = d->domain;
91 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
92 int hwirq;
93 u32 r;
94
95 hwirq = d->irq - data->virq_base;
96 if (data == &icu_data[0]) {
97 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
98 r &= ~data->conf_mask;
99 r |= data->conf_disable;
100 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
101 } else {
102 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
103 writel_relaxed(r, data->reg_mask);
104 }
105}
106
107static void icu_unmask_irq(struct irq_data *d)
108{
109 struct irq_domain *domain = d->domain;
110 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
111 int hwirq;
112 u32 r;
113
114 hwirq = d->irq - data->virq_base;
115 if (data == &icu_data[0]) {
116 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
117 r &= ~data->conf_mask;
118 r |= data->conf_enable;
119 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
120 } else {
121 r = readl_relaxed(data->reg_mask) & ~(1 << hwirq);
122 writel_relaxed(r, data->reg_mask);
123 }
124}
125
126struct irq_chip icu_irq_chip = {
127 .name = "icu_irq",
128 .irq_mask = icu_mask_irq,
129 .irq_mask_ack = icu_mask_ack_irq,
130 .irq_unmask = icu_unmask_irq,
131};
132
133static void icu_mux_irq_demux(unsigned int irq, struct irq_desc *desc)
134{
135 struct irq_domain *domain;
136 struct icu_chip_data *data;
137 int i;
138 unsigned long mask, status, n;
139
140 for (i = 1; i < max_icu_nr; i++) {
141 if (irq == icu_data[i].cascade_irq) {
142 domain = icu_data[i].domain;
143 data = (struct icu_chip_data *)domain->host_data;
144 break;
145 }
146 }
147 if (i >= max_icu_nr) {
148 pr_err("Spurious irq %d in MMP INTC\n", irq);
149 return;
150 }
151
152 mask = readl_relaxed(data->reg_mask);
153 while (1) {
154 status = readl_relaxed(data->reg_status) & ~mask;
155 if (status == 0)
156 break;
157 for_each_set_bit(n, &status, BITS_PER_LONG) {
158 generic_handle_irq(icu_data[i].virq_base + n);
159 }
160 }
161}
162
163static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq,
164 irq_hw_number_t hw)
165{
166 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
167 set_irq_flags(irq, IRQF_VALID);
168 return 0;
169}
170
171static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
172 const u32 *intspec, unsigned int intsize,
173 unsigned long *out_hwirq,
174 unsigned int *out_type)
175{
176 *out_hwirq = intspec[0];
177 return 0;
178}
179
180const struct irq_domain_ops mmp_irq_domain_ops = {
181 .map = mmp_irq_domain_map,
182 .xlate = mmp_irq_domain_xlate,
183};
184
185static struct mmp_intc_conf mmp_conf = {
186 .conf_enable = 0x51,
187 .conf_disable = 0x0,
188 .conf_mask = 0x7f,
189};
190
191static struct mmp_intc_conf mmp2_conf = {
192 .conf_enable = 0x20,
193 .conf_disable = 0x0,
194 .conf_mask = 0x7f,
195};
196
197static void __exception_irq_entry mmp_handle_irq(struct pt_regs *regs)
198{
199 int irq, hwirq;
200
201 hwirq = readl_relaxed(mmp_icu_base + PJ1_INT_SEL);
202 if (!(hwirq & SEL_INT_PENDING))
203 return;
204 hwirq &= SEL_INT_NUM_MASK;
205 irq = irq_find_mapping(icu_data[0].domain, hwirq);
206 handle_IRQ(irq, regs);
207}
208
209static void __exception_irq_entry mmp2_handle_irq(struct pt_regs *regs)
210{
211 int irq, hwirq;
212
213 hwirq = readl_relaxed(mmp_icu_base + PJ4_INT_SEL);
214 if (!(hwirq & SEL_INT_PENDING))
215 return;
216 hwirq &= SEL_INT_NUM_MASK;
217 irq = irq_find_mapping(icu_data[0].domain, hwirq);
218 handle_IRQ(irq, regs);
219}
220
221/* MMP (ARMv5) */
222void __init icu_init_irq(void)
223{
224 int irq;
225
226 max_icu_nr = 1;
227 mmp_icu_base = ioremap(0xd4282000, 0x1000);
228 icu_data[0].conf_enable = mmp_conf.conf_enable;
229 icu_data[0].conf_disable = mmp_conf.conf_disable;
230 icu_data[0].conf_mask = mmp_conf.conf_mask;
231 icu_data[0].nr_irqs = 64;
232 icu_data[0].virq_base = 0;
233 icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
234 &irq_domain_simple_ops,
235 &icu_data[0]);
236 for (irq = 0; irq < 64; irq++) {
237 icu_mask_irq(irq_get_irq_data(irq));
238 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
239 set_irq_flags(irq, IRQF_VALID);
240 }
241 irq_set_default_host(icu_data[0].domain);
242 set_handle_irq(mmp_handle_irq);
243}
244
245/* MMP2 (ARMv7) */
246void __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 set_irq_flags(irq, IRQF_VALID);
343 }
344 irq_set_default_host(icu_data[0].domain);
345 set_handle_irq(mmp2_handle_irq);
346}
347
348#ifdef CONFIG_OF
349static int __init mmp_init_bases(struct device_node *node)
350{
351 int ret, nr_irqs, irq, i = 0;
352
353 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
354 if (ret) {
355 pr_err("Not found mrvl,intc-nr-irqs property\n");
356 return ret;
357 }
358
359 mmp_icu_base = of_iomap(node, 0);
360 if (!mmp_icu_base) {
361 pr_err("Failed to get interrupt controller register\n");
362 return -ENOMEM;
363 }
364
365 icu_data[0].virq_base = 0;
366 icu_data[0].domain = irq_domain_add_linear(node, nr_irqs,
367 &mmp_irq_domain_ops,
368 &icu_data[0]);
369 for (irq = 0; irq < nr_irqs; irq++) {
370 ret = irq_create_mapping(icu_data[0].domain, irq);
371 if (!ret) {
372 pr_err("Failed to mapping hwirq\n");
373 goto err;
374 }
375 if (!irq)
376 icu_data[0].virq_base = ret;
377 }
378 icu_data[0].nr_irqs = nr_irqs;
379 return 0;
380err:
381 if (icu_data[0].virq_base) {
382 for (i = 0; i < irq; i++)
383 irq_dispose_mapping(icu_data[0].virq_base + i);
384 }
385 irq_domain_remove(icu_data[0].domain);
386 iounmap(mmp_icu_base);
387 return -EINVAL;
388}
389
390static int __init mmp_of_init(struct device_node *node,
391 struct device_node *parent)
392{
393 int ret;
394
395 ret = mmp_init_bases(node);
396 if (ret < 0)
397 return ret;
398
399 icu_data[0].conf_enable = mmp_conf.conf_enable;
400 icu_data[0].conf_disable = mmp_conf.conf_disable;
401 icu_data[0].conf_mask = mmp_conf.conf_mask;
402 irq_set_default_host(icu_data[0].domain);
403 set_handle_irq(mmp_handle_irq);
404 max_icu_nr = 1;
405 return 0;
406}
407IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init);
408
409static int __init mmp2_of_init(struct device_node *node,
410 struct device_node *parent)
411{
412 int ret;
413
414 ret = mmp_init_bases(node);
415 if (ret < 0)
416 return ret;
417
418 icu_data[0].conf_enable = mmp2_conf.conf_enable;
419 icu_data[0].conf_disable = mmp2_conf.conf_disable;
420 icu_data[0].conf_mask = mmp2_conf.conf_mask;
421 irq_set_default_host(icu_data[0].domain);
422 set_handle_irq(mmp2_handle_irq);
423 max_icu_nr = 1;
424 return 0;
425}
426IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init);
427
428static int __init mmp2_mux_of_init(struct device_node *node,
429 struct device_node *parent)
430{
431 struct resource res;
432 int i, ret, irq, j = 0;
433 u32 nr_irqs, mfp_irq;
434
435 if (!parent)
436 return -ENODEV;
437
438 i = max_icu_nr;
439 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
440 &nr_irqs);
441 if (ret) {
442 pr_err("Not found mrvl,intc-nr-irqs property\n");
443 return -EINVAL;
444 }
445 ret = of_address_to_resource(node, 0, &res);
446 if (ret < 0) {
447 pr_err("Not found reg property\n");
448 return -EINVAL;
449 }
450 icu_data[i].reg_status = mmp_icu_base + res.start;
451 ret = of_address_to_resource(node, 1, &res);
452 if (ret < 0) {
453 pr_err("Not found reg property\n");
454 return -EINVAL;
455 }
456 icu_data[i].reg_mask = mmp_icu_base + res.start;
457 icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
458 if (!icu_data[i].cascade_irq)
459 return -EINVAL;
460
461 icu_data[i].virq_base = 0;
462 icu_data[i].domain = irq_domain_add_linear(node, nr_irqs,
463 &mmp_irq_domain_ops,
464 &icu_data[i]);
465 for (irq = 0; irq < nr_irqs; irq++) {
466 ret = irq_create_mapping(icu_data[i].domain, irq);
467 if (!ret) {
468 pr_err("Failed to mapping hwirq\n");
469 goto err;
470 }
471 if (!irq)
472 icu_data[i].virq_base = ret;
473 }
474 icu_data[i].nr_irqs = nr_irqs;
475 if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
476 &mfp_irq)) {
477 icu_data[i].clr_mfp_irq_base = icu_data[i].virq_base;
478 icu_data[i].clr_mfp_hwirq = mfp_irq;
479 }
480 irq_set_chained_handler(icu_data[i].cascade_irq,
481 icu_mux_irq_demux);
482 max_icu_nr++;
483 return 0;
484err:
485 if (icu_data[i].virq_base) {
486 for (j = 0; j < irq; j++)
487 irq_dispose_mapping(icu_data[i].virq_base + j);
488 }
489 irq_domain_remove(icu_data[i].domain);
490 return -EINVAL;
491}
492IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init);
493#endif