drivers/sh/intc/core.c

   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 - 2012 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 ([email protected])
  12  * Copyright (C) 2003  Takashi Kusuda <[email protected]>
  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/stat.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/sh_intc.h>
  28 #include <linux/irqdomain.h>
  29 #include <linux/device.h>
  30 #include <linux/syscore_ops.h>
  31 #include <linux/list.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/radix-tree.h>
  34 #include <linux/export.h>
  35 #include <linux/sort.h>
  36 #include "internals.h"
  37
  38 LIST_HEAD(intc_list);
  39 DEFINE_RAW_SPINLOCK(intc_big_lock);
  40 static unsigned int nr_intc_controllers;
  41
  42 /*
  43  * Default priority level
  44  * - this needs to be at least 2 for 5-bit priorities on 7780
  45  */
  46 static unsigned int default_prio_level = 2;     /* 2 - 16 */
  47 static unsigned int intc_prio_level[INTC_NR_IRQS];      /* for now */
  48
  49 unsigned int intc_get_dfl_prio_level(void)
  50 {
  51         return default_prio_level;
  52 }
  53
  54 unsigned int intc_get_prio_level(unsigned int irq)
  55 {
  56         return intc_prio_level[irq];
  57 }
  58
  59 void intc_set_prio_level(unsigned int irq, unsigned int level)
  60 {
  61         unsigned long flags;
  62
  63         raw_spin_lock_irqsave(&intc_big_lock, flags);
  64         intc_prio_level[irq] = level;
  65         raw_spin_unlock_irqrestore(&intc_big_lock, flags);
  66 }
  67
  68 static void intc_redirect_irq(struct irq_desc *desc)
  69 {
  70         generic_handle_irq((unsigned int)irq_desc_get_handler_data(desc));
  71 }
  72
  73 static void __init intc_register_irq(struct intc_desc *desc,
  74                                      struct intc_desc_int *d,
  75                                      intc_enum enum_id,
  76                                      unsigned int irq)
  77 {
  78         struct intc_handle_int *hp;
  79         struct irq_data *irq_data;
  80         unsigned int data[2], primary;
  81         unsigned long flags;
  82
  83         raw_spin_lock_irqsave(&intc_big_lock, flags);
  84         radix_tree_insert(&d->tree, enum_id, intc_irq_xlate_get(irq));
  85         raw_spin_unlock_irqrestore(&intc_big_lock, flags);
  86
  87         /*
  88          * Prefer single interrupt source bitmap over other combinations:
  89          *
  90          * 1. bitmap, single interrupt source
  91          * 2. priority, single interrupt source
  92          * 3. bitmap, multiple interrupt sources (groups)
  93          * 4. priority, multiple interrupt sources (groups)
  94          */
  95         data[0] = intc_get_mask_handle(desc, d, enum_id, 0);
  96         data[1] = intc_get_prio_handle(desc, d, enum_id, 0);
  97
  98         primary = 0;
  99         if (!data[0] && data[1])
 100                 primary = 1;
 101
 102         if (!data[0] && !data[1])
 103                 pr_warn("missing unique irq mask for irq %d (vect 0x%04x)\n",
 104                         irq, irq2evt(irq));
 105
 106         data[0] = data[0] ? data[0] : intc_get_mask_handle(desc, d, enum_id, 1);
 107         data[1] = data[1] ? data[1] : intc_get_prio_handle(desc, d, enum_id, 1);
 108
 109         if (!data[primary])
 110                 primary ^= 1;
 111
 112         BUG_ON(!data[primary]); /* must have primary masking method */
 113
 114         irq_data = irq_get_irq_data(irq);
 115
 116         disable_irq_nosync(irq);
 117         irq_set_chip_and_handler_name(irq, &d->chip, handle_level_irq,
 118                                       "level");
 119         irq_set_chip_data(irq, (void *)data[primary]);
 120
 121         /*
 122          * set priority level
 123          */
 124         intc_set_prio_level(irq, intc_get_dfl_prio_level());
 125
 126         /* enable secondary masking method if present */
 127         if (data[!primary])
 128                 _intc_enable(irq_data, data[!primary]);
 129
 130         /* add irq to d->prio list if priority is available */
 131         if (data[1]) {
 132                 hp = d->prio + d->nr_prio;
 133                 hp->irq = irq;
 134                 hp->handle = data[1];
 135
 136                 if (primary) {
 137                         /*
 138                          * only secondary priority should access registers, so
 139                          * set _INTC_FN(h) = REG_FN_ERR for intc_set_priority()
 140                          */
 141                         hp->handle &= ~_INTC_MK(0x0f, 0, 0, 0, 0, 0);
 142                         hp->handle |= _INTC_MK(REG_FN_ERR, 0, 0, 0, 0, 0);
 143                 }
 144                 d->nr_prio++;
 145         }
 146
 147         /* add irq to d->sense list if sense is available */
 148         data[0] = intc_get_sense_handle(desc, d, enum_id);
 149         if (data[0]) {
 150                 (d->sense + d->nr_sense)->irq = irq;
 151                 (d->sense + d->nr_sense)->handle = data[0];
 152                 d->nr_sense++;
 153         }
 154
 155         /* irq should be disabled by default */
 156         d->chip.irq_mask(irq_data);
 157
 158         intc_set_ack_handle(irq, desc, d, enum_id);
 159         intc_set_dist_handle(irq, desc, d, enum_id);
 160
 161         activate_irq(irq);
 162 }
 163
 164 static unsigned int __init save_reg(struct intc_desc_int *d,
 165                                     unsigned int cnt,
 166                                     unsigned long value,
 167                                     unsigned int smp)
 168 {
 169         if (value) {
 170                 value = intc_phys_to_virt(d, value);
 171
 172                 d->reg[cnt] = value;
 173 #ifdef CONFIG_SMP
 174                 d->smp[cnt] = smp;
 175 #endif
 176                 return 1;
 177         }
 178
 179         return 0;
 180 }
 181
 182 int __init register_intc_controller(struct intc_desc *desc)
 183 {
 184         unsigned int i, k, smp;
 185         struct intc_hw_desc *hw = &desc->hw;
 186         struct intc_desc_int *d;
 187         struct resource *res;
 188
 189         pr_info("Registered controller '%s' with %u IRQs\n",
 190                 desc->name, hw->nr_vectors);
 191
 192         d = kzalloc(sizeof(*d), GFP_NOWAIT);
 193         if (!d)
 194                 goto err0;
 195
 196         INIT_LIST_HEAD(&d->list);
 197         list_add_tail(&d->list, &intc_list);
 198
 199         raw_spin_lock_init(&d->lock);
 200         INIT_RADIX_TREE(&d->tree, GFP_ATOMIC);
 201
 202         d->index = nr_intc_controllers;
 203
 204         if (desc->num_resources) {
 205                 d->nr_windows = desc->num_resources;
 206                 d->window = kcalloc(d->nr_windows, sizeof(*d->window),
 207                                     GFP_NOWAIT);
 208                 if (!d->window)
 209                         goto err1;
 210
 211                 for (k = 0; k < d->nr_windows; k++) {
 212                         res = desc->resource + k;
 213                         WARN_ON(resource_type(res) != IORESOURCE_MEM);
 214                         d->window[k].phys = res->start;
 215                         d->window[k].size = resource_size(res);
 216                         d->window[k].virt = ioremap(res->start,
 217                                                          resource_size(res));
 218                         if (!d->window[k].virt)
 219                                 goto err2;
 220                 }
 221         }
 222
 223         d->nr_reg = hw->mask_regs ? hw->nr_mask_regs * 2 : 0;
 224 #ifdef CONFIG_INTC_BALANCING
 225         if (d->nr_reg)
 226                 d->nr_reg += hw->nr_mask_regs;
 227 #endif
 228         d->nr_reg += hw->prio_regs ? hw->nr_prio_regs * 2 : 0;
 229         d->nr_reg += hw->sense_regs ? hw->nr_sense_regs : 0;
 230         d->nr_reg += hw->ack_regs ? hw->nr_ack_regs : 0;
 231         d->nr_reg += hw->subgroups ? hw->nr_subgroups : 0;
 232
 233         d->reg = kcalloc(d->nr_reg, sizeof(*d->reg), GFP_NOWAIT);
 234         if (!d->reg)
 235                 goto err2;
 236
 237 #ifdef CONFIG_SMP
 238         d->smp = kcalloc(d->nr_reg, sizeof(*d->smp), GFP_NOWAIT);
 239         if (!d->smp)
 240                 goto err3;
 241 #endif
 242         k = 0;
 243
 244         if (hw->mask_regs) {
 245                 for (i = 0; i < hw->nr_mask_regs; i++) {
 246                         smp = IS_SMP(hw->mask_regs[i]);
 247                         k += save_reg(d, k, hw->mask_regs[i].set_reg, smp);
 248                         k += save_reg(d, k, hw->mask_regs[i].clr_reg, smp);
 249 #ifdef CONFIG_INTC_BALANCING
 250                         k += save_reg(d, k, hw->mask_regs[i].dist_reg, 0);
 251 #endif
 252                 }
 253         }
 254
 255         if (hw->prio_regs) {
 256                 d->prio = kcalloc(hw->nr_vectors, sizeof(*d->prio),
 257                                   GFP_NOWAIT);
 258                 if (!d->prio)
 259                         goto err4;
 260
 261                 for (i = 0; i < hw->nr_prio_regs; i++) {
 262                         smp = IS_SMP(hw->prio_regs[i]);
 263                         k += save_reg(d, k, hw->prio_regs[i].set_reg, smp);
 264                         k += save_reg(d, k, hw->prio_regs[i].clr_reg, smp);
 265                 }
 266
 267                 sort(d->prio, hw->nr_prio_regs, sizeof(*d->prio),
 268                      intc_handle_int_cmp, NULL);
 269         }
 270
 271         if (hw->sense_regs) {
 272                 d->sense = kcalloc(hw->nr_vectors, sizeof(*d->sense),
 273                                    GFP_NOWAIT);
 274                 if (!d->sense)
 275                         goto err5;
 276
 277                 for (i = 0; i < hw->nr_sense_regs; i++)
 278                         k += save_reg(d, k, hw->sense_regs[i].reg, 0);
 279
 280                 sort(d->sense, hw->nr_sense_regs, sizeof(*d->sense),
 281                      intc_handle_int_cmp, NULL);
 282         }
 283
 284         if (hw->subgroups)
 285                 for (i = 0; i < hw->nr_subgroups; i++)
 286                         if (hw->subgroups[i].reg)
 287                                 k+= save_reg(d, k, hw->subgroups[i].reg, 0);
 288
 289         memcpy(&d->chip, &intc_irq_chip, sizeof(struct irq_chip));
 290         d->chip.name = desc->name;
 291
 292         if (hw->ack_regs)
 293                 for (i = 0; i < hw->nr_ack_regs; i++)
 294                         k += save_reg(d, k, hw->ack_regs[i].set_reg, 0);
 295         else
 296                 d->chip.irq_mask_ack = d->chip.irq_disable;
 297
 298         /* disable bits matching force_disable before registering irqs */
 299         if (desc->force_disable)
 300                 intc_enable_disable_enum(desc, d, desc->force_disable, 0);
 301
 302         /* disable bits matching force_enable before registering irqs */
 303         if (desc->force_enable)
 304                 intc_enable_disable_enum(desc, d, desc->force_enable, 0);
 305
 306         BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */
 307
 308         intc_irq_domain_init(d, hw);
 309
 310         /* register the vectors one by one */
 311         for (i = 0; i < hw->nr_vectors; i++) {
 312                 struct intc_vect *vect = hw->vectors + i;
 313                 unsigned int irq = evt2irq(vect->vect);
 314                 int res;
 315
 316                 if (!vect->enum_id)
 317                         continue;
 318
 319                 res = irq_create_identity_mapping(d->domain, irq);
 320                 if (unlikely(res)) {
 321                         if (res == -EEXIST) {
 322                                 res = irq_domain_associate(d->domain, irq, irq);
 323                                 if (unlikely(res)) {
 324                                         pr_err("domain association failure\n");
 325                                         continue;
 326                                 }
 327                         } else {
 328                                 pr_err("can't identity map IRQ %d\n", irq);
 329                                 continue;
 330                         }
 331                 }
 332
 333                 intc_irq_xlate_set(irq, vect->enum_id, d);
 334                 intc_register_irq(desc, d, vect->enum_id, irq);
 335
 336                 for (k = i + 1; k < hw->nr_vectors; k++) {
 337                         struct intc_vect *vect2 = hw->vectors + k;
 338                         unsigned int irq2 = evt2irq(vect2->vect);
 339
 340                         if (vect->enum_id != vect2->enum_id)
 341                                 continue;
 342
 343                         /*
 344                          * In the case of multi-evt handling and sparse
 345                          * IRQ support, each vector still needs to have
 346                          * its own backing irq_desc.
 347                          */
 348                         res = irq_create_identity_mapping(d->domain, irq2);
 349                         if (unlikely(res)) {
 350                                 if (res == -EEXIST) {
 351                                         res = irq_domain_associate(d->domain,
 352                                                                    irq2, irq2);
 353                                         if (unlikely(res)) {
 354                                                 pr_err("domain association "
 355                                                        "failure\n");
 356                                                 continue;
 357                                         }
 358                                 } else {
 359                                         pr_err("can't identity map IRQ %d\n",
 360                                                irq);
 361                                         continue;
 362                                 }
 363                         }
 364
 365                         vect2->enum_id = 0;
 366
 367                         /* redirect this interrupts to the first one */
 368                         irq_set_chip(irq2, &dummy_irq_chip);
 369                         irq_set_chained_handler_and_data(irq2,
 370                                                          intc_redirect_irq,
 371                                                          (void *)irq);
 372                 }
 373         }
 374
 375         intc_subgroup_init(desc, d);
 376
 377         /* enable bits matching force_enable after registering irqs */
 378         if (desc->force_enable)
 379                 intc_enable_disable_enum(desc, d, desc->force_enable, 1);
 380
 381         d->skip_suspend = desc->skip_syscore_suspend;
 382
 383         nr_intc_controllers++;
 384
 385         return 0;
 386 err5:
 387         kfree(d->prio);
 388 err4:
 389 #ifdef CONFIG_SMP
 390         kfree(d->smp);
 391 err3:
 392 #endif
 393         kfree(d->reg);
 394 err2:
 395         for (k = 0; k < d->nr_windows; k++)
 396                 if (d->window[k].virt)
 397                         iounmap(d->window[k].virt);
 398
 399         kfree(d->window);
 400 err1:
 401         kfree(d);
 402 err0:
 403         pr_err("unable to allocate INTC memory\n");
 404
 405         return -ENOMEM;
 406 }
 407
 408 static int intc_suspend(void)
 409 {
 410         struct intc_desc_int *d;
 411
 412         list_for_each_entry(d, &intc_list, list) {
 413                 int irq;
 414
 415                 if (d->skip_suspend)
 416                         continue;
 417
 418                 /* enable wakeup irqs belonging to this intc controller */
 419                 for_each_active_irq(irq) {
 420                         struct irq_data *data;
 421                         struct irq_chip *chip;
 422
 423                         data = irq_get_irq_data(irq);
 424                         chip = irq_data_get_irq_chip(data);
 425                         if (chip != &d->chip)
 426                                 continue;
 427                         if (irqd_is_wakeup_set(data))
 428                                 chip->irq_enable(data);
 429                 }
 430         }
 431         return 0;
 432 }
 433
 434 static void intc_resume(void)
 435 {
 436         struct intc_desc_int *d;
 437
 438         list_for_each_entry(d, &intc_list, list) {
 439                 int irq;
 440
 441                 if (d->skip_suspend)
 442                         continue;
 443
 444                 for_each_active_irq(irq) {
 445                         struct irq_data *data;
 446                         struct irq_chip *chip;
 447
 448                         data = irq_get_irq_data(irq);
 449                         chip = irq_data_get_irq_chip(data);
 450                         /*
 451                          * This will catch the redirect and VIRQ cases
 452                          * due to the dummy_irq_chip being inserted.
 453                          */
 454                         if (chip != &d->chip)
 455                                 continue;
 456                         if (irqd_irq_disabled(data))
 457                                 chip->irq_disable(data);
 458                         else
 459                                 chip->irq_enable(data);
 460                 }
 461         }
 462 }
 463
 464 struct syscore_ops intc_syscore_ops = {
 465         .suspend        = intc_suspend,
 466         .resume         = intc_resume,
 467 };
 468
 469 struct bus_type intc_subsys = {
 470         .name           = "intc",
 471         .dev_name       = "intc",
 472 };
 473
 474 static ssize_t
 475 show_intc_name(struct device *dev, struct device_attribute *attr, char *buf)
 476 {
 477         struct intc_desc_int *d;
 478
 479         d = container_of(dev, struct intc_desc_int, dev);
 480
 481         return sprintf(buf, "%s\n", d->chip.name);
 482 }
 483
 484 static DEVICE_ATTR(name, S_IRUGO, show_intc_name, NULL);
 485
 486 static int __init register_intc_devs(void)
 487 {
 488         struct intc_desc_int *d;
 489         int error;
 490
 491         register_syscore_ops(&intc_syscore_ops);
 492
 493         error = subsys_system_register(&intc_subsys, NULL);
 494         if (!error) {
 495                 list_for_each_entry(d, &intc_list, list) {
 496                         d->dev.id = d->index;
 497                         d->dev.bus = &intc_subsys;
 498                         error = device_register(&d->dev);
 499                         if (error == 0)
 500                                 error = device_create_file(&d->dev,
 501                                                            &dev_attr_name);
 502                         if (error)
 503                                 break;
 504                 }
 505         }
 506
 507         if (error)
 508                 pr_err("device registration error\n");
 509
 510         return error;
 511 }
 512 device_initcall(register_intc_devs);