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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/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
40struct 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
54struct mmp_intc_conf {
55 unsigned int conf_enable;
56 unsigned int conf_disable;
57 unsigned int conf_mask;
58};
59
60static void __iomem *mmp_icu_base;
61static struct icu_chip_data icu_data[MAX_ICU_NR];
62static int max_icu_nr;
63
64extern void mmp2_clear_pmic_int(void);
65
66static 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
90static 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
109static 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
128struct 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
135static 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
166static 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
173static 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
182static const struct irq_domain_ops mmp_irq_domain_ops = {
183 .map = mmp_irq_domain_map,
184 .xlate = mmp_irq_domain_xlate,
185};
186
187static const struct mmp_intc_conf mmp_conf = {
188 .conf_enable = 0x51,
189 .conf_disable = 0x0,
190 .conf_mask = 0x7f,
191};
192
193static 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
200static 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
211static 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) */
223void __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) */
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 }
343 irq_set_default_host(icu_data[0].domain);
344 set_handle_irq(mmp2_handle_irq);
345}
346
347#ifdef CONFIG_OF
348static 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;
379err:
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
389static 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}
406IRQCHIP_DECLARE(mmp_intc, "mrvl,mmp-intc", mmp_of_init);
407
408static 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}
425IRQCHIP_DECLARE(mmp2_intc, "mrvl,mmp2-intc", mmp2_of_init);
426
427static 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;
483err:
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}
491IRQCHIP_DECLARE(mmp2_mux_intc, "mrvl,mmp2-mux-intc", mmp2_mux_of_init);
492#endif
493

Warning: That file was not part of the compilation database. It may have many parsing errors.