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tty/serial: atmel_serial: whitespace and braces modifications
[zen-stable.git] / drivers / sh / intc / core.c
blobc6ca115c71dfc57babfe3804494729d14f078b79
1 /*
2 * Shared interrupt handling code for IPR and INTC2 types of IRQs.
3 *
4 * Copyright (C) 2007, 2008 Magnus Damm
5 * Copyright (C) 2009, 2010 Paul Mundt
6 *
7 * Based on intc2.c and ipr.c
8 *
9 * Copyright (C) 1999 Niibe Yutaka & Takeshi Yaegashi
10 * Copyright (C) 2000 Kazumoto Kojima
11 * Copyright (C) 2001 David J. Mckay (david.mckay@st.com)
12 * Copyright (C) 2003 Takashi Kusuda <kusuda-takashi@hitachi-ul.co.jp>
13 * Copyright (C) 2005, 2006 Paul Mundt
14 *
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file "COPYING" in the main directory of this archive
17 * for more details.
18 */
19 #define pr_fmt(fmt) "intc: " fmt
20
21 #include <linux/init.h>
22 #include <linux/irq.h>
23 #include <linux/io.h>
24 #include <linux/slab.h>
25 #include <linux/interrupt.h>
26 #include <linux/sh_intc.h>
27 #include <linux/sysdev.h>
28 #include <linux/syscore_ops.h>
29 #include <linux/list.h>
30 #include <linux/spinlock.h>
31 #include <linux/radix-tree.h>
32 #include "internals.h"
33
34 LIST_HEAD(intc_list);
35 DEFINE_RAW_SPINLOCK(intc_big_lock);
36 unsigned int nr_intc_controllers;
37
38 /*
39 * Default priority level
40 * - this needs to be at least 2 for 5-bit priorities on 7780
41 */
42 static unsigned int default_prio_level = 2; /* 2 - 16 */
43 static unsigned int intc_prio_level[NR_IRQS]; /* for now */
44
45 unsigned int intc_get_dfl_prio_level(void)
46 {
47 return default_prio_level;
48 }
49
50 unsigned int intc_get_prio_level(unsigned int irq)
51 {
52 return intc_prio_level[irq];
53 }
54
55 void intc_set_prio_level(unsigned int irq, unsigned int level)
56 {
57 unsigned long flags;
58
59 raw_spin_lock_irqsave(&intc_big_lock, flags);
60 intc_prio_level[irq] = level;
61 raw_spin_unlock_irqrestore(&intc_big_lock, flags);
62 }
63
64 static void intc_redirect_irq(unsigned int irq, struct irq_desc *desc)
65 {
66 generic_handle_irq((unsigned int)irq_get_handler_data(irq));
67 }
68
69 static void __init intc_register_irq(struct intc_desc *desc,
70 struct intc_desc_int *d,
71 intc_enum enum_id,
72 unsigned int irq)
73 {
74 struct intc_handle_int *hp;
75 struct irq_data *irq_data;
76 unsigned int data[2], primary;
77 unsigned long flags;
78
79 /*
80 * Register the IRQ position with the global IRQ map, then insert
81 * it in to the radix tree.
82 */
83 irq_reserve_irq(irq);
84
85 raw_spin_lock_irqsave(&intc_big_lock, flags);
86 radix_tree_insert(&d->tree, enum_id, intc_irq_xlate_get(irq));
87 raw_spin_unlock_irqrestore(&intc_big_lock, flags);
88
89 /*
90 * Prefer single interrupt source bitmap over other combinations:
91 *
92 * 1. bitmap, single interrupt source
93 * 2. priority, single interrupt source
94 * 3. bitmap, multiple interrupt sources (groups)
95 * 4. priority, multiple interrupt sources (groups)
96 */
97 data[0] = intc_get_mask_handle(desc, d, enum_id, 0);
98 data[1] = intc_get_prio_handle(desc, d, enum_id, 0);
99
100 primary = 0;
101 if (!data[0] && data[1])
102 primary = 1;
103
104 if (!data[0] && !data[1])
105 pr_warning("missing unique irq mask for irq %d (vect 0x%04x)\n",
106 irq, irq2evt(irq));
107
108 data[0] = data[0] ? data[0] : intc_get_mask_handle(desc, d, enum_id, 1);
109 data[1] = data[1] ? data[1] : intc_get_prio_handle(desc, d, enum_id, 1);
110
111 if (!data[primary])
112 primary ^= 1;
113
114 BUG_ON(!data[primary]); /* must have primary masking method */
115
116 irq_data = irq_get_irq_data(irq);
117
118 disable_irq_nosync(irq);
119 irq_set_chip_and_handler_name(irq, &d->chip, handle_level_irq,
120 "level");
121 irq_set_chip_data(irq, (void *)data[primary]);
122
123 /*
124 * set priority level
125 */
126 intc_set_prio_level(irq, intc_get_dfl_prio_level());
127
128 /* enable secondary masking method if present */
129 if (data[!primary])
130 _intc_enable(irq_data, data[!primary]);
131
132 /* add irq to d->prio list if priority is available */
133 if (data[1]) {
134 hp = d->prio + d->nr_prio;
135 hp->irq = irq;
136 hp->handle = data[1];
137
138 if (primary) {
139 /*
140 * only secondary priority should access registers, so
141 * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
142 */
143 hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
144 hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
145 }
146 d->nr_prio++;
147 }
148
149 /* add irq to d->sense list if sense is available */
150 data[0] = intc_get_sense_handle(desc, d, enum_id);
151 if (data[0]) {
152 (d->sense + d->nr_sense)->irq = irq;
153 (d->sense + d->nr_sense)->handle = data[0];
154 d->nr_sense++;
155 }
156
157 /* irq should be disabled by default */
158 d->chip.irq_mask(irq_data);
159
160 intc_set_ack_handle(irq, desc, d, enum_id);
161 intc_set_dist_handle(irq, desc, d, enum_id);
162
163 activate_irq(irq);
164 }
165
166 static unsigned int __init save_reg(struct intc_desc_int *d,
167 unsigned int cnt,
168 unsigned long value,
169 unsigned int smp)
170 {
171 if (value) {
172 value = intc_phys_to_virt(d, value);
173
174 d->reg[cnt] = value;
175 #ifdef CONFIG_SMP
176 d->smp[cnt] = smp;
177 #endif
178 return 1;
179 }
180
181 return 0;
182 }
183
184 int __init register_intc_controller(struct intc_desc *desc)
185 {
186 unsigned int i, k, smp;
187 struct intc_hw_desc *hw = &desc->hw;
188 struct intc_desc_int *d;
189 struct resource *res;
190
191 pr_info("Registered controller '%s' with %u IRQs\n",
192 desc->name, hw->nr_vectors);
193
194 d = kzalloc(sizeof(*d), GFP_NOWAIT);
195 if (!d)
196 goto err0;
197
198 INIT_LIST_HEAD(&d->list);
199 list_add_tail(&d->list, &intc_list);
200
201 raw_spin_lock_init(&d->lock);
202 INIT_RADIX_TREE(&d->tree, GFP_ATOMIC);
203
204 d->index = nr_intc_controllers;
205
206 if (desc->num_resources) {
207 d->nr_windows = desc->num_resources;
208 d->window = kzalloc(d->nr_windows * sizeof(*d->window),
209 GFP_NOWAIT);
210 if (!d->window)
211 goto err1;
212
213 for (k = 0; k < d->nr_windows; k++) {
214 res = desc->resource + k;
215 WARN_ON(resource_type(res) != IORESOURCE_MEM);
216 d->window[k].phys = res->start;
217 d->window[k].size = resource_size(res);
218 d->window[k].virt = ioremap_nocache(res->start,
219 resource_size(res));
220 if (!d->window[k].virt)
221 goto err2;
222 }
223 }
224
225 d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
226 #ifdef CONFIG_INTC_BALANCING
227 if (d->nr_reg)
228 d->nr_reg += hw->nr_mask_regs;
229 #endif
230 d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
231 d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
232 d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0;
233 d->nr_reg += hw->subgroups ? hw->nr_subgroups : 0;
234
235 d->reg = kzalloc(d->nr_reg * sizeof(*d->reg), GFP_NOWAIT);
236 if (!d->reg)
237 goto err2;
238
239 #ifdef CONFIG_SMP
240 d->smp = kzalloc(d->nr_reg * sizeof(*d->smp), GFP_NOWAIT);
241 if (!d->smp)
242 goto err3;
243 #endif
244 k = 0;
245
246 if (hw->mask_regs) {
247 for (i = 0; i < hw->nr_mask_regs; i++) {
248 smp = IS_SMP(hw->mask_regs[i]);
249 k += save_reg(d, k, hw->mask_regs[i].set_reg, smp);
250 k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp);
251 #ifdef CONFIG_INTC_BALANCING
252 k += save_reg(d, k, hw->mask_regs[i].dist_reg, 0);
253 #endif
254 }
255 }
256
257 if (hw->prio_regs) {
258 d->prio = kzalloc(hw->nr_vectors * sizeof(*d->prio),
259 GFP_NOWAIT);
260 if (!d->prio)
261 goto err4;
262
263 for (i = 0; i < hw->nr_prio_regs; i++) {
264 smp = IS_SMP(hw->prio_regs[i]);
265 k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
266 k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
267 }
268 }
269
270 if (hw->sense_regs) {
271 d->sense = kzalloc(hw->nr_vectors * sizeof(*d->sense),
272 GFP_NOWAIT);
273 if (!d->sense)
274 goto err5;
275
276 for (i = 0; i < hw->nr_sense_regs; i++)
277 k += save_reg(d, k, hw->sense_regs[i].reg, 0);
278 }
279
280 if (hw->subgroups)
281 for (i = 0; i < hw->nr_subgroups; i++)
282 if (hw->subgroups[i].reg)
283 k+= save_reg(d, k, hw->subgroups[i].reg, 0);
284
285 memcpy(&d->chip, &intc_irq_chip, sizeof(struct irq_chip));
286 d->chip.name = desc->name;
287
288 if (hw->ack_regs)
289 for (i = 0; i < hw->nr_ack_regs; i++)
290 k += save_reg(d, k, hw->ack_regs[i].set_reg, 0);
291 else
292 d->chip.irq_mask_ack = d->chip.irq_disable;
293
294 /* disable bits matching force_disable before registering irqs */
295 if (desc->force_disable)
296 intc_enable_disable_enum(desc, d, desc->force_disable, 0);
297
298 /* disable bits matching force_enable before registering irqs */
299 if (desc->force_enable)
300 intc_enable_disable_enum(desc, d, desc->force_enable, 0);
301
302 BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
303
304 /* register the vectors one by one */
305 for (i = 0; i < hw->nr_vectors; i++) {
306 struct intc_vect *vect = hw->vectors + i;
307 unsigned int irq = evt2irq(vect->vect);
308 int res;
309
310 if (!vect->enum_id)
311 continue;
312
313 res = irq_alloc_desc_at(irq, numa_node_id());
314 if (res != irq && res != -EEXIST) {
315 pr_err("can't get irq_desc for %d\n", irq);
316 continue;
317 }
318
319 intc_irq_xlate_set(irq, vect->enum_id, d);
320 intc_register_irq(desc, d, vect->enum_id, irq);
321
322 for (k = i + 1; k < hw->nr_vectors; k++) {
323 struct intc_vect *vect2 = hw->vectors + k;
324 unsigned int irq2 = evt2irq(vect2->vect);
325
326 if (vect->enum_id != vect2->enum_id)
327 continue;
328
329 /*
330 * In the case of multi-evt handling and sparse
331 * IRQ support, each vector still needs to have
332 * its own backing irq_desc.
333 */
334 res = irq_alloc_desc_at(irq2, numa_node_id());
335 if (res != irq2 && res != -EEXIST) {
336 pr_err("can't get irq_desc for %d\n", irq2);
337 continue;
338 }
339
340 vect2->enum_id = 0;
341
342 /* redirect this interrupts to the first one */
343 irq_set_chip(irq2, &dummy_irq_chip);
344 irq_set_chained_handler(irq2, intc_redirect_irq);
345 irq_set_handler_data(irq2, (void *)irq);
346 }
347 }
348
349 intc_subgroup_init(desc, d);
350
351 /* enable bits matching force_enable after registering irqs */
352 if (desc->force_enable)
353 intc_enable_disable_enum(desc, d, desc->force_enable, 1);
354
355 nr_intc_controllers++;
356
357 return 0;
358 err5:
359 kfree(d->prio);
360 err4:
361 #ifdef CONFIG_SMP
362 kfree(d->smp);
363 err3:
364 #endif
365 kfree(d->reg);
366 err2:
367 for (k = 0; k < d->nr_windows; k++)
368 if (d->window[k].virt)
369 iounmap(d->window[k].virt);
370
371 kfree(d->window);
372 err1:
373 kfree(d);
374 err0:
375 pr_err("unable to allocate INTC memory\n");
376
377 return -ENOMEM;
378 }
379
380 static int intc_suspend(void)
381 {
382 struct intc_desc_int *d;
383
384 list_for_each_entry(d, &intc_list, list) {
385 int irq;
386
387 /* enable wakeup irqs belonging to this intc controller */
388 for_each_active_irq(irq) {
389 struct irq_data *data;
390 struct irq_chip *chip;
391
392 data = irq_get_irq_data(irq);
393 chip = irq_data_get_irq_chip(data);
394 if (chip != &d->chip)
395 continue;
396 if (irqd_is_wakeup_set(data))
397 chip->irq_enable(data);
398 }
399 }
400 return 0;
401 }
402
403 static void intc_resume(void)
404 {
405 struct intc_desc_int *d;
406
407 list_for_each_entry(d, &intc_list, list) {
408 int irq;
409
410 for_each_active_irq(irq) {
411 struct irq_data *data;
412 struct irq_chip *chip;
413
414 data = irq_get_irq_data(irq);
415 chip = irq_data_get_irq_chip(data);
416 /*
417 * This will catch the redirect and VIRQ cases
418 * due to the dummy_irq_chip being inserted.
419 */
420 if (chip != &d->chip)
421 continue;
422 if (irqd_irq_disabled(data))
423 chip->irq_disable(data);
424 else
425 chip->irq_enable(data);
426 }
427 }
428 }
429
430 struct syscore_ops intc_syscore_ops = {
431 .suspend = intc_suspend,
432 .resume = intc_resume,
433 };
434
435 struct sysdev_class intc_sysdev_class = {
436 .name = "intc",
437 };
438
439 static ssize_t
440 show_intc_name(struct sys_device *dev, struct sysdev_attribute *attr, char *buf)
441 {
442 struct intc_desc_int *d;
443
444 d = container_of(dev, struct intc_desc_int, sysdev);
445
446 return sprintf(buf, "%s\n", d->chip.name);
447 }
448
449 static SYSDEV_ATTR(name, S_IRUGO, show_intc_name, NULL);
450
451 static int __init register_intc_sysdevs(void)
452 {
453 struct intc_desc_int *d;
454 int error;
455
456 register_syscore_ops(&intc_syscore_ops);
457
458 error = sysdev_class_register(&intc_sysdev_class);
459 if (!error) {
460 list_for_each_entry(d, &intc_list, list) {
461 d->sysdev.id = d->index;
462 d->sysdev.cls = &intc_sysdev_class;
463 error = sysdev_register(&d->sysdev);
464 if (error == 0)
465 error = sysdev_create_file(&d->sysdev,
466 &attr_name);
467 if (error)
468 break;
469 }
470 }
471
472 if (error)
473 pr_err("sysdev registration error\n");
474
475 return error;
476 }
477 device_initcall(register_intc_sysdevs);