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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 <mach/irqs.h>
25
26#ifdef CONFIG_CPU_MMP2
27#include <mach/pm-mmp2.h>
28#endif
29#ifdef CONFIG_CPU_PXA910
30#include <mach/pm-pxa910.h>
31#endif
32
33#include "common.h"
34
35#define MAX_ICU_NR 16
36
37struct icu_chip_data {
38 int nr_irqs;
39 unsigned int virq_base;
40 unsigned int cascade_irq;
41 void __iomem *reg_status;
42 void __iomem *reg_mask;
43 unsigned int conf_enable;
44 unsigned int conf_disable;
45 unsigned int conf_mask;
46 unsigned int clr_mfp_irq_base;
47 unsigned int clr_mfp_hwirq;
48 struct irq_domain *domain;
49};
50
51struct mmp_intc_conf {
52 unsigned int conf_enable;
53 unsigned int conf_disable;
54 unsigned int conf_mask;
55};
56
57void __iomem *mmp_icu_base;
58static struct icu_chip_data icu_data[MAX_ICU_NR];
59static int max_icu_nr;
60
61extern void mmp2_clear_pmic_int(void);
62
63static void icu_mask_ack_irq(struct irq_data *d)
64{
65 struct irq_domain *domain = d->domain;
66 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
67 int hwirq;
68 u32 r;
69
70 hwirq = d->irq - data->virq_base;
71 if (data == &icu_data[0]) {
72 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
73 r &= ~data->conf_mask;
74 r |= data->conf_disable;
75 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
76 } else {
77#ifdef CONFIG_CPU_MMP2
78 if ((data->virq_base == data->clr_mfp_irq_base)
79 && (hwirq == data->clr_mfp_hwirq))
80 mmp2_clear_pmic_int();
81#endif
82 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
83 writel_relaxed(r, data->reg_mask);
84 }
85}
86
87static void icu_mask_irq(struct irq_data *d)
88{
89 struct irq_domain *domain = d->domain;
90 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
91 int hwirq;
92 u32 r;
93
94 hwirq = d->irq - data->virq_base;
95 if (data == &icu_data[0]) {
96 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
97 r &= ~data->conf_mask;
98 r |= data->conf_disable;
99 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
100 } else {
101 r = readl_relaxed(data->reg_mask) | (1 << hwirq);
102 writel_relaxed(r, data->reg_mask);
103 }
104}
105
106static void icu_unmask_irq(struct irq_data *d)
107{
108 struct irq_domain *domain = d->domain;
109 struct icu_chip_data *data = (struct icu_chip_data *)domain->host_data;
110 int hwirq;
111 u32 r;
112
113 hwirq = d->irq - data->virq_base;
114 if (data == &icu_data[0]) {
115 r = readl_relaxed(mmp_icu_base + (hwirq << 2));
116 r &= ~data->conf_mask;
117 r |= data->conf_enable;
118 writel_relaxed(r, mmp_icu_base + (hwirq << 2));
119 } else {
120 r = readl_relaxed(data->reg_mask) & ~(1 << hwirq);
121 writel_relaxed(r, data->reg_mask);
122 }
123}
124
125static struct irq_chip icu_irq_chip = {
126 .name = "icu_irq",
127 .irq_mask = icu_mask_irq,
128 .irq_mask_ack = icu_mask_ack_irq,
129 .irq_unmask = icu_unmask_irq,
130};
131
132static void icu_mux_irq_demux(unsigned int irq, struct irq_desc *desc)
133{
134 struct irq_domain *domain;
135 struct icu_chip_data *data;
136 int i;
137 unsigned long mask, status, n;
138
139 for (i = 1; i < max_icu_nr; i++) {
140 if (irq == icu_data[i].cascade_irq) {
141 domain = icu_data[i].domain;
142 data = (struct icu_chip_data *)domain->host_data;
143 break;
144 }
145 }
146 if (i >= max_icu_nr) {
147 pr_err("Spurious irq %d in MMP INTC\n", irq);
148 return;
149 }
150
151 mask = readl_relaxed(data->reg_mask);
152 while (1) {
153 status = readl_relaxed(data->reg_status) & ~mask;
154 if (status == 0)
155 break;
156 n = find_first_bit(&status, BITS_PER_LONG);
157 while (n < BITS_PER_LONG) {
158 generic_handle_irq(icu_data[i].virq_base + n);
159 n = find_next_bit(&status, BITS_PER_LONG, n + 1);
160 }
161 }
162}
163
164static int mmp_irq_domain_map(struct irq_domain *d, unsigned int irq,
165 irq_hw_number_t hw)
166{
167 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
168 set_irq_flags(irq, IRQF_VALID);
169 return 0;
170}
171
172static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
173 const u32 *intspec, unsigned int intsize,
174 unsigned long *out_hwirq,
175 unsigned int *out_type)
176{
177 *out_hwirq = intspec[0];
178 return 0;
179}
180
181const struct irq_domain_ops mmp_irq_domain_ops = {
182 .map = mmp_irq_domain_map,
183 .xlate = mmp_irq_domain_xlate,
184};
185
186static struct mmp_intc_conf mmp_conf = {
187 .conf_enable = 0x51,
188 .conf_disable = 0x0,
189 .conf_mask = 0x7f,
190};
191
192static struct mmp_intc_conf mmp2_conf = {
193 .conf_enable = 0x20,
194 .conf_disable = 0x0,
195 .conf_mask = 0x7f,
196};
197
198/* MMP (ARMv5) */
199void __init icu_init_irq(void)
200{
201 int irq;
202
203 max_icu_nr = 1;
204 mmp_icu_base = ioremap(0xd4282000, 0x1000);
205 icu_data[0].conf_enable = mmp_conf.conf_enable;
206 icu_data[0].conf_disable = mmp_conf.conf_disable;
207 icu_data[0].conf_mask = mmp_conf.conf_mask;
208 icu_data[0].nr_irqs = 64;
209 icu_data[0].virq_base = 0;
210 icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
211 &irq_domain_simple_ops,
212 &icu_data[0]);
213 for (irq = 0; irq < 64; irq++) {
214 icu_mask_irq(irq_get_irq_data(irq));
215 irq_set_chip_and_handler(irq, &icu_irq_chip, handle_level_irq);
216 set_irq_flags(irq, IRQF_VALID);
217 }
218 irq_set_default_host(icu_data[0].domain);
219#ifdef CONFIG_CPU_PXA910
220 icu_irq_chip.irq_set_wake = pxa910_set_wake;
221#endif
222}
223
224/* MMP2 (ARMv7) */
225void __init mmp2_init_icu(void)
226{
227 int irq;
228
229 max_icu_nr = 8;
230 mmp_icu_base = ioremap(0xd4282000, 0x1000);
231 icu_data[0].conf_enable = mmp2_conf.conf_enable;
232 icu_data[0].conf_disable = mmp2_conf.conf_disable;
233 icu_data[0].conf_mask = mmp2_conf.conf_mask;
234 icu_data[0].nr_irqs = 64;
235 icu_data[0].virq_base = 0;
236 icu_data[0].domain = irq_domain_add_legacy(NULL, 64, 0, 0,
237 &irq_domain_simple_ops,
238 &icu_data[0]);
239 icu_data[1].reg_status = mmp_icu_base + 0x150;
240 icu_data[1].reg_mask = mmp_icu_base + 0x168;
241 icu_data[1].clr_mfp_irq_base = IRQ_MMP2_PMIC_BASE;
242 icu_data[1].clr_mfp_hwirq = IRQ_MMP2_PMIC - IRQ_MMP2_PMIC_BASE;
243 icu_data[1].nr_irqs = 2;
244 icu_data[1].cascade_irq = 4;
245 icu_data[1].virq_base = IRQ_MMP2_PMIC_BASE;
246 icu_data[1].domain = irq_domain_add_legacy(NULL, icu_data[1].nr_irqs,
247 icu_data[1].virq_base, 0,
248 &irq_domain_simple_ops,
249 &icu_data[1]);
250 icu_data[2].reg_status = mmp_icu_base + 0x154;
251 icu_data[2].reg_mask = mmp_icu_base + 0x16c;
252 icu_data[2].nr_irqs = 2;
253 icu_data[2].cascade_irq = 5;
254 icu_data[2].virq_base = IRQ_MMP2_RTC_BASE;
255 icu_data[2].domain = irq_domain_add_legacy(NULL, icu_data[2].nr_irqs,
256 icu_data[2].virq_base, 0,
257 &irq_domain_simple_ops,
258 &icu_data[2]);
259 icu_data[3].reg_status = mmp_icu_base + 0x180;
260 icu_data[3].reg_mask = mmp_icu_base + 0x17c;
261 icu_data[3].nr_irqs = 3;
262 icu_data[3].cascade_irq = 9;
263 icu_data[3].virq_base = IRQ_MMP2_KEYPAD_BASE;
264 icu_data[3].domain = irq_domain_add_legacy(NULL, icu_data[3].nr_irqs,
265 icu_data[3].virq_base, 0,
266 &irq_domain_simple_ops,
267 &icu_data[3]);
268 icu_data[4].reg_status = mmp_icu_base + 0x158;
269 icu_data[4].reg_mask = mmp_icu_base + 0x170;
270 icu_data[4].nr_irqs = 5;
271 icu_data[4].cascade_irq = 17;
272 icu_data[4].virq_base = IRQ_MMP2_TWSI_BASE;
273 icu_data[4].domain = irq_domain_add_legacy(NULL, icu_data[4].nr_irqs,
274 icu_data[4].virq_base, 0,
275 &irq_domain_simple_ops,
276 &icu_data[4]);
277 icu_data[5].reg_status = mmp_icu_base + 0x15c;
278 icu_data[5].reg_mask = mmp_icu_base + 0x174;
279 icu_data[5].nr_irqs = 15;
280 icu_data[5].cascade_irq = 35;
281 icu_data[5].virq_base = IRQ_MMP2_MISC_BASE;
282 icu_data[5].domain = irq_domain_add_legacy(NULL, icu_data[5].nr_irqs,
283 icu_data[5].virq_base, 0,
284 &irq_domain_simple_ops,
285 &icu_data[5]);
286 icu_data[6].reg_status = mmp_icu_base + 0x160;
287 icu_data[6].reg_mask = mmp_icu_base + 0x178;
288 icu_data[6].nr_irqs = 2;
289 icu_data[6].cascade_irq = 51;
290 icu_data[6].virq_base = IRQ_MMP2_MIPI_HSI1_BASE;
291 icu_data[6].domain = irq_domain_add_legacy(NULL, icu_data[6].nr_irqs,
292 icu_data[6].virq_base, 0,
293 &irq_domain_simple_ops,
294 &icu_data[6]);
295 icu_data[7].reg_status = mmp_icu_base + 0x188;
296 icu_data[7].reg_mask = mmp_icu_base + 0x184;
297 icu_data[7].nr_irqs = 2;
298 icu_data[7].cascade_irq = 55;
299 icu_data[7].virq_base = IRQ_MMP2_MIPI_HSI0_BASE;
300 icu_data[7].domain = irq_domain_add_legacy(NULL, icu_data[7].nr_irqs,
301 icu_data[7].virq_base, 0,
302 &irq_domain_simple_ops,
303 &icu_data[7]);
304 for (irq = 0; irq < IRQ_MMP2_MUX_END; irq++) {
305 icu_mask_irq(irq_get_irq_data(irq));
306 switch (irq) {
307 case IRQ_MMP2_PMIC_MUX:
308 case IRQ_MMP2_RTC_MUX:
309 case IRQ_MMP2_KEYPAD_MUX:
310 case IRQ_MMP2_TWSI_MUX:
311 case IRQ_MMP2_MISC_MUX:
312 case IRQ_MMP2_MIPI_HSI1_MUX:
313 case IRQ_MMP2_MIPI_HSI0_MUX:
314 irq_set_chip(irq, &icu_irq_chip);
315 irq_set_chained_handler(irq, icu_mux_irq_demux);
316 break;
317 default:
318 irq_set_chip_and_handler(irq, &icu_irq_chip,
319 handle_level_irq);
320 break;
321 }
322 set_irq_flags(irq, IRQF_VALID);
323 }
324 irq_set_default_host(icu_data[0].domain);
325#ifdef CONFIG_CPU_MMP2
326 icu_irq_chip.irq_set_wake = mmp2_set_wake;
327#endif
328}
329
330#ifdef CONFIG_OF
331static const struct of_device_id intc_ids[] __initconst = {
332 { .compatible = "mrvl,mmp-intc", .data = &mmp_conf },
333 { .compatible = "mrvl,mmp2-intc", .data = &mmp2_conf },
334 {}
335};
336
337static const struct of_device_id mmp_mux_irq_match[] __initconst = {
338 { .compatible = "mrvl,mmp2-mux-intc" },
339 {}
340};
341
342int __init mmp2_mux_init(struct device_node *parent)
343{
344 struct device_node *node;
345 const struct of_device_id *of_id;
346 struct resource res;
347 int i, irq_base, ret, irq;
348 u32 nr_irqs, mfp_irq;
349
350 node = parent;
351 max_icu_nr = 1;
352 for (i = 1; i < MAX_ICU_NR; i++) {
353 node = of_find_matching_node(node, mmp_mux_irq_match);
354 if (!node)
355 break;
356 of_id = of_match_node(&mmp_mux_irq_match[0], node);
357 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs",
358 &nr_irqs);
359 if (ret) {
360 pr_err("Not found mrvl,intc-nr-irqs property\n");
361 ret = -EINVAL;
362 goto err;
363 }
364 ret = of_address_to_resource(node, 0, &res);
365 if (ret < 0) {
366 pr_err("Not found reg property\n");
367 ret = -EINVAL;
368 goto err;
369 }
370 icu_data[i].reg_status = mmp_icu_base + res.start;
371 ret = of_address_to_resource(node, 1, &res);
372 if (ret < 0) {
373 pr_err("Not found reg property\n");
374 ret = -EINVAL;
375 goto err;
376 }
377 icu_data[i].reg_mask = mmp_icu_base + res.start;
378 icu_data[i].cascade_irq = irq_of_parse_and_map(node, 0);
379 if (!icu_data[i].cascade_irq) {
380 ret = -EINVAL;
381 goto err;
382 }
383
384 irq_base = irq_alloc_descs(-1, 0, nr_irqs, 0);
385 if (irq_base < 0) {
386 pr_err("Failed to allocate IRQ numbers for mux intc\n");
387 ret = irq_base;
388 goto err;
389 }
390 if (!of_property_read_u32(node, "mrvl,clr-mfp-irq",
391 &mfp_irq)) {
392 icu_data[i].clr_mfp_irq_base = irq_base;
393 icu_data[i].clr_mfp_hwirq = mfp_irq;
394 }
395 irq_set_chained_handler(icu_data[i].cascade_irq,
396 icu_mux_irq_demux);
397 icu_data[i].nr_irqs = nr_irqs;
398 icu_data[i].virq_base = irq_base;
399 icu_data[i].domain = irq_domain_add_legacy(node, nr_irqs,
400 irq_base, 0,
401 &mmp_irq_domain_ops,
402 &icu_data[i]);
403 for (irq = irq_base; irq < irq_base + nr_irqs; irq++)
404 icu_mask_irq(irq_get_irq_data(irq));
405 }
406 max_icu_nr = i;
407 return 0;
408err:
409 of_node_put(node);
410 max_icu_nr = i;
411 return ret;
412}
413
414void __init mmp_dt_irq_init(void)
415{
416 struct device_node *node;
417 const struct of_device_id *of_id;
418 struct mmp_intc_conf *conf;
419 int nr_irqs, irq_base, ret, irq;
420
421 node = of_find_matching_node(NULL, intc_ids);
422 if (!node) {
423 pr_err("Failed to find interrupt controller in arch-mmp\n");
424 return;
425 }
426 of_id = of_match_node(intc_ids, node);
427 conf = of_id->data;
428
429 ret = of_property_read_u32(node, "mrvl,intc-nr-irqs", &nr_irqs);
430 if (ret) {
431 pr_err("Not found mrvl,intc-nr-irqs property\n");
432 return;
433 }
434
435 mmp_icu_base = of_iomap(node, 0);
436 if (!mmp_icu_base) {
437 pr_err("Failed to get interrupt controller register\n");
438 return;
439 }
440
441 irq_base = irq_alloc_descs(-1, 0, nr_irqs - NR_IRQS_LEGACY, 0);
442 if (irq_base < 0) {
443 pr_err("Failed to allocate IRQ numbers\n");
444 goto err;
445 } else if (irq_base != NR_IRQS_LEGACY) {
446 pr_err("ICU's irqbase should be started from 0\n");
447 goto err;
448 }
449 icu_data[0].conf_enable = conf->conf_enable;
450 icu_data[0].conf_disable = conf->conf_disable;
451 icu_data[0].conf_mask = conf->conf_mask;
452 icu_data[0].nr_irqs = nr_irqs;
453 icu_data[0].virq_base = 0;
454 icu_data[0].domain = irq_domain_add_legacy(node, nr_irqs, 0, 0,
455 &mmp_irq_domain_ops,
456 &icu_data[0]);
457 irq_set_default_host(icu_data[0].domain);
458 for (irq = 0; irq < nr_irqs; irq++)
459 icu_mask_irq(irq_get_irq_data(irq));
460 mmp2_mux_init(node);
461 return;
462err:
463 iounmap(mmp_icu_base);
464}
465#endif