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   1 /*
   2  * Driver for s390 chsc subchannels
   3  *
   4  * Copyright IBM Corp. 2008, 2009
   5  *
   6  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
   7  *
   8  */
   9
  10 #include <linux/device.h>
  11 #include <linux/module.h>
  12 #include <linux/uaccess.h>
  13 #include <linux/miscdevice.h>
  14
  15 #include <asm/cio.h>
  16 #include <asm/chsc.h>
  17 #include <asm/isc.h>
  18
  19 #include "cio.h"
  20 #include "cio_debug.h"
  21 #include "css.h"
  22 #include "chsc_sch.h"
  23 #include "ioasm.h"
  24
  25 static debug_info_t *chsc_debug_msg_id;
  26 static debug_info_t *chsc_debug_log_id;
  27
  28 #define CHSC_MSG(imp, args...) do {                                     \
  29                 debug_sprintf_event(chsc_debug_msg_id, imp , ##args);   \
  30         } while (0)
  31
  32 #define CHSC_LOG(imp, txt) do {                                 \
  33                 debug_text_event(chsc_debug_log_id, imp , txt); \
  34         } while (0)
  35
  36 static void CHSC_LOG_HEX(int level, void *data, int length)
  37 {
  38         while (length > 0) {
  39                 debug_event(chsc_debug_log_id, level, data, length);
  40                 length -= chsc_debug_log_id->buf_size;
  41                 data += chsc_debug_log_id->buf_size;
  42         }
  43 }
  44
  45 MODULE_AUTHOR("IBM Corporation");
  46 MODULE_DESCRIPTION("driver for s390 chsc subchannels");
  47 MODULE_LICENSE("GPL");
  48
  49 static void chsc_subchannel_irq(struct subchannel *sch)
  50 {
  51         struct chsc_private *private = sch->private;
  52         struct chsc_request *request = private->request;
  53         struct irb *irb = (struct irb *)__LC_IRB;
  54
  55         CHSC_LOG(4, "irb");
  56         CHSC_LOG_HEX(4, irb, sizeof(*irb));
  57         /* Copy irb to provided request and set done. */
  58         if (!request) {
  59                 CHSC_MSG(0, "Interrupt on sch 0.%x.%04x with no request\n",
  60                          sch->schid.ssid, sch->schid.sch_no);
  61                 return;
  62         }
  63         private->request = NULL;
  64         memcpy(&request->irb, irb, sizeof(*irb));
  65         cio_update_schib(sch);
  66         complete(&request->completion);
  67         put_device(&sch->dev);
  68 }
  69
  70 static int chsc_subchannel_probe(struct subchannel *sch)
  71 {
  72         struct chsc_private *private;
  73         int ret;
  74
  75         CHSC_MSG(6, "Detected chsc subchannel 0.%x.%04x\n",
  76                  sch->schid.ssid, sch->schid.sch_no);
  77         sch->isc = CHSC_SCH_ISC;
  78         private = kzalloc(sizeof(*private), GFP_KERNEL);
  79         if (!private)
  80                 return -ENOMEM;
  81         ret = cio_enable_subchannel(sch, (u32)(unsigned long)sch);
  82         if (ret) {
  83                 CHSC_MSG(0, "Failed to enable 0.%x.%04x: %d\n",
  84                          sch->schid.ssid, sch->schid.sch_no, ret);
  85                 kfree(private);
  86         } else {
  87                 sch->private = private;
  88                 if (dev_get_uevent_suppress(&sch->dev)) {
  89                         dev_set_uevent_suppress(&sch->dev, 0);
  90                         kobject_uevent(&sch->dev.kobj, KOBJ_ADD);
  91                 }
  92         }
  93         return ret;
  94 }
  95
  96 static int chsc_subchannel_remove(struct subchannel *sch)
  97 {
  98         struct chsc_private *private;
  99
 100         cio_disable_subchannel(sch);
 101         private = sch->private;
 102         sch->private = NULL;
 103         if (private->request) {
 104                 complete(&private->request->completion);
 105                 put_device(&sch->dev);
 106         }
 107         kfree(private);
 108         return 0;
 109 }
 110
 111 static void chsc_subchannel_shutdown(struct subchannel *sch)
 112 {
 113         cio_disable_subchannel(sch);
 114 }
 115
 116 static int chsc_subchannel_prepare(struct subchannel *sch)
 117 {
 118         int cc;
 119         struct schib schib;
 120         /*
 121          * Don't allow suspend while the subchannel is not idle
 122          * since we don't have a way to clear the subchannel and
 123          * cannot disable it with a request running.
 124          */
 125         cc = stsch(sch->schid, &schib);
 126         if (!cc && scsw_stctl(&schib.scsw))
 127                 return -EAGAIN;
 128         return 0;
 129 }
 130
 131 static int chsc_subchannel_freeze(struct subchannel *sch)
 132 {
 133         return cio_disable_subchannel(sch);
 134 }
 135
 136 static int chsc_subchannel_restore(struct subchannel *sch)
 137 {
 138         return cio_enable_subchannel(sch, (u32)(unsigned long)sch);
 139 }
 140
 141 static struct css_device_id chsc_subchannel_ids[] = {
 142         { .match_flags = 0x1, .type =SUBCHANNEL_TYPE_CHSC, },
 143         { /* end of list */ },
 144 };
 145 MODULE_DEVICE_TABLE(css, chsc_subchannel_ids);
 146
 147 static struct css_driver chsc_subchannel_driver = {
 148         .owner = THIS_MODULE,
 149         .subchannel_type = chsc_subchannel_ids,
 150         .irq = chsc_subchannel_irq,
 151         .probe = chsc_subchannel_probe,
 152         .remove = chsc_subchannel_remove,
 153         .shutdown = chsc_subchannel_shutdown,
 154         .prepare = chsc_subchannel_prepare,
 155         .freeze = chsc_subchannel_freeze,
 156         .thaw = chsc_subchannel_restore,
 157         .restore = chsc_subchannel_restore,
 158         .name = "chsc_subchannel",
 159 };
 160
 161 static int __init chsc_init_dbfs(void)
 162 {
 163         chsc_debug_msg_id = debug_register("chsc_msg", 16, 1,
 164                                            16 * sizeof(long));
 165         if (!chsc_debug_msg_id)
 166                 goto out;
 167         debug_register_view(chsc_debug_msg_id, &debug_sprintf_view);
 168         debug_set_level(chsc_debug_msg_id, 2);
 169         chsc_debug_log_id = debug_register("chsc_log", 16, 1, 16);
 170         if (!chsc_debug_log_id)
 171                 goto out;
 172         debug_register_view(chsc_debug_log_id, &debug_hex_ascii_view);
 173         debug_set_level(chsc_debug_log_id, 2);
 174         return 0;
 175 out:
 176         if (chsc_debug_msg_id)
 177                 debug_unregister(chsc_debug_msg_id);
 178         return -ENOMEM;
 179 }
 180
 181 static void chsc_remove_dbfs(void)
 182 {
 183         debug_unregister(chsc_debug_log_id);
 184         debug_unregister(chsc_debug_msg_id);
 185 }
 186
 187 static int __init chsc_init_sch_driver(void)
 188 {
 189         return css_driver_register(&chsc_subchannel_driver);
 190 }
 191
 192 static void chsc_cleanup_sch_driver(void)
 193 {
 194         css_driver_unregister(&chsc_subchannel_driver);
 195 }
 196
 197 static DEFINE_SPINLOCK(chsc_lock);
 198
 199 static int chsc_subchannel_match_next_free(struct device *dev, void *data)
 200 {
 201         struct subchannel *sch = to_subchannel(dev);
 202
 203         return sch->schib.pmcw.ena && !scsw_fctl(&sch->schib.scsw);
 204 }
 205
 206 static struct subchannel *chsc_get_next_subchannel(struct subchannel *sch)
 207 {
 208         struct device *dev;
 209
 210         dev = driver_find_device(&chsc_subchannel_driver.drv,
 211                                  sch ? &sch->dev : NULL, NULL,
 212                                  chsc_subchannel_match_next_free);
 213         return dev ? to_subchannel(dev) : NULL;
 214 }
 215
 216 /**
 217  * chsc_async() - try to start a chsc request asynchronously
 218  * @chsc_area: request to be started
 219  * @request: request structure to associate
 220  *
 221  * Tries to start a chsc request on one of the existing chsc subchannels.
 222  * Returns:
 223  *  %0 if the request was performed synchronously
 224  *  %-EINPROGRESS if the request was successfully started
 225  *  %-EBUSY if all chsc subchannels are busy
 226  *  %-ENODEV if no chsc subchannels are available
 227  * Context:
 228  *  interrupts disabled, chsc_lock held
 229  */
 230 static int chsc_async(struct chsc_async_area *chsc_area,
 231                       struct chsc_request *request)
 232 {
 233         int cc;
 234         struct chsc_private *private;
 235         struct subchannel *sch = NULL;
 236         int ret = -ENODEV;
 237         char dbf[10];
 238
 239         chsc_area->header.key = PAGE_DEFAULT_KEY;
 240         while ((sch = chsc_get_next_subchannel(sch))) {
 241                 spin_lock(sch->lock);
 242                 private = sch->private;
 243                 if (private->request) {
 244                         spin_unlock(sch->lock);
 245                         ret = -EBUSY;
 246                         continue;
 247                 }
 248                 chsc_area->header.sid = sch->schid;
 249                 CHSC_LOG(2, "schid");
 250                 CHSC_LOG_HEX(2, &sch->schid, sizeof(sch->schid));
 251                 cc = chsc(chsc_area);
 252                 sprintf(dbf, "cc:%d", cc);
 253                 CHSC_LOG(2, dbf);
 254                 switch (cc) {
 255                 case 0:
 256                         ret = 0;
 257                         break;
 258                 case 1:
 259                         sch->schib.scsw.cmd.fctl |= SCSW_FCTL_START_FUNC;
 260                         ret = -EINPROGRESS;
 261                         private->request = request;
 262                         break;
 263                 case 2:
 264                         ret = -EBUSY;
 265                         break;
 266                 default:
 267                         ret = -ENODEV;
 268                 }
 269                 spin_unlock(sch->lock);
 270                 CHSC_MSG(2, "chsc on 0.%x.%04x returned cc=%d\n",
 271                          sch->schid.ssid, sch->schid.sch_no, cc);
 272                 if (ret == -EINPROGRESS)
 273                         return -EINPROGRESS;
 274                 put_device(&sch->dev);
 275                 if (ret == 0)
 276                         return 0;
 277         }
 278         return ret;
 279 }
 280
 281 static void chsc_log_command(struct chsc_async_area *chsc_area)
 282 {
 283         char dbf[10];
 284
 285         sprintf(dbf, "CHSC:%x", chsc_area->header.code);
 286         CHSC_LOG(0, dbf);
 287         CHSC_LOG_HEX(0, chsc_area, 32);
 288 }
 289
 290 static int chsc_examine_irb(struct chsc_request *request)
 291 {
 292         int backed_up;
 293
 294         if (!(scsw_stctl(&request->irb.scsw) & SCSW_STCTL_STATUS_PEND))
 295                 return -EIO;
 296         backed_up = scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHAIN_CHECK;
 297         request->irb.scsw.cmd.cstat &= ~SCHN_STAT_CHAIN_CHECK;
 298         if (scsw_cstat(&request->irb.scsw) == 0)
 299                 return 0;
 300         if (!backed_up)
 301                 return 0;
 302         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROG_CHECK)
 303                 return -EIO;
 304         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_PROT_CHECK)
 305                 return -EPERM;
 306         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_DATA_CHK)
 307                 return -EAGAIN;
 308         if (scsw_cstat(&request->irb.scsw) & SCHN_STAT_CHN_CTRL_CHK)
 309                 return -EAGAIN;
 310         return -EIO;
 311 }
 312
 313 static int chsc_ioctl_start(void __user *user_area)
 314 {
 315         struct chsc_request *request;
 316         struct chsc_async_area *chsc_area;
 317         int ret;
 318         char dbf[10];
 319
 320         if (!css_general_characteristics.dynio)
 321                 /* It makes no sense to try. */
 322                 return -EOPNOTSUPP;
 323         chsc_area = (void *)get_zeroed_page(GFP_DMA | GFP_KERNEL);
 324         if (!chsc_area)
 325                 return -ENOMEM;
 326         request = kzalloc(sizeof(*request), GFP_KERNEL);
 327         if (!request) {
 328                 ret = -ENOMEM;
 329                 goto out_free;
 330         }
 331         init_completion(&request->completion);
 332         if (copy_from_user(chsc_area, user_area, PAGE_SIZE)) {
 333                 ret = -EFAULT;
 334                 goto out_free;
 335         }
 336         chsc_log_command(chsc_area);
 337         spin_lock_irq(&chsc_lock);
 338         ret = chsc_async(chsc_area, request);
 339         spin_unlock_irq(&chsc_lock);
 340         if (ret == -EINPROGRESS) {
 341                 wait_for_completion(&request->completion);
 342                 ret = chsc_examine_irb(request);
 343         }
 344         /* copy area back to user */
 345         if (!ret)
 346                 if (copy_to_user(user_area, chsc_area, PAGE_SIZE))
 347                         ret = -EFAULT;
 348 out_free:
 349         sprintf(dbf, "ret:%d", ret);
 350         CHSC_LOG(0, dbf);
 351         kfree(request);
 352         free_page((unsigned long)chsc_area);
 353         return ret;
 354 }
 355
 356 static int chsc_ioctl_info_channel_path(void __user *user_cd)
 357 {
 358         struct chsc_chp_cd *cd;
 359         int ret, ccode;
 360         struct {
 361                 struct chsc_header request;
 362                 u32 : 2;
 363                 u32 m : 1;
 364                 u32 : 1;
 365                 u32 fmt1 : 4;
 366                 u32 cssid : 8;
 367                 u32 : 8;
 368                 u32 first_chpid : 8;
 369                 u32 : 24;
 370                 u32 last_chpid : 8;
 371                 u32 : 32;
 372                 struct chsc_header response;
 373                 u8 data[PAGE_SIZE - 20];
 374         } __attribute__ ((packed)) *scpcd_area;
 375
 376         scpcd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 377         if (!scpcd_area)
 378                 return -ENOMEM;
 379         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 380         if (!cd) {
 381                 ret = -ENOMEM;
 382                 goto out_free;
 383         }
 384         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 385                 ret = -EFAULT;
 386                 goto out_free;
 387         }
 388         scpcd_area->request.length = 0x0010;
 389         scpcd_area->request.code = 0x0028;
 390         scpcd_area->m = cd->m;
 391         scpcd_area->fmt1 = cd->fmt;
 392         scpcd_area->cssid = cd->chpid.cssid;
 393         scpcd_area->first_chpid = cd->chpid.id;
 394         scpcd_area->last_chpid = cd->chpid.id;
 395
 396         ccode = chsc(scpcd_area);
 397         if (ccode != 0) {
 398                 ret = -EIO;
 399                 goto out_free;
 400         }
 401         if (scpcd_area->response.code != 0x0001) {
 402                 ret = -EIO;
 403                 CHSC_MSG(0, "scpcd: response code=%x\n",
 404                          scpcd_area->response.code);
 405                 goto out_free;
 406         }
 407         memcpy(&cd->cpcb, &scpcd_area->response, scpcd_area->response.length);
 408         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 409                 ret = -EFAULT;
 410         else
 411                 ret = 0;
 412 out_free:
 413         kfree(cd);
 414         free_page((unsigned long)scpcd_area);
 415         return ret;
 416 }
 417
 418 static int chsc_ioctl_info_cu(void __user *user_cd)
 419 {
 420         struct chsc_cu_cd *cd;
 421         int ret, ccode;
 422         struct {
 423                 struct chsc_header request;
 424                 u32 : 2;
 425                 u32 m : 1;
 426                 u32 : 1;
 427                 u32 fmt1 : 4;
 428                 u32 cssid : 8;
 429                 u32 : 8;
 430                 u32 first_cun : 8;
 431                 u32 : 24;
 432                 u32 last_cun : 8;
 433                 u32 : 32;
 434                 struct chsc_header response;
 435                 u8 data[PAGE_SIZE - 20];
 436         } __attribute__ ((packed)) *scucd_area;
 437
 438         scucd_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 439         if (!scucd_area)
 440                 return -ENOMEM;
 441         cd = kzalloc(sizeof(*cd), GFP_KERNEL);
 442         if (!cd) {
 443                 ret = -ENOMEM;
 444                 goto out_free;
 445         }
 446         if (copy_from_user(cd, user_cd, sizeof(*cd))) {
 447                 ret = -EFAULT;
 448                 goto out_free;
 449         }
 450         scucd_area->request.length = 0x0010;
 451         scucd_area->request.code = 0x0028;
 452         scucd_area->m = cd->m;
 453         scucd_area->fmt1 = cd->fmt;
 454         scucd_area->cssid = cd->cssid;
 455         scucd_area->first_cun = cd->cun;
 456         scucd_area->last_cun = cd->cun;
 457
 458         ccode = chsc(scucd_area);
 459         if (ccode != 0) {
 460                 ret = -EIO;
 461                 goto out_free;
 462         }
 463         if (scucd_area->response.code != 0x0001) {
 464                 ret = -EIO;
 465                 CHSC_MSG(0, "scucd: response code=%x\n",
 466                          scucd_area->response.code);
 467                 goto out_free;
 468         }
 469         memcpy(&cd->cucb, &scucd_area->response, scucd_area->response.length);
 470         if (copy_to_user(user_cd, cd, sizeof(*cd)))
 471                 ret = -EFAULT;
 472         else
 473                 ret = 0;
 474 out_free:
 475         kfree(cd);
 476         free_page((unsigned long)scucd_area);
 477         return ret;
 478 }
 479
 480 static int chsc_ioctl_info_sch_cu(void __user *user_cud)
 481 {
 482         struct chsc_sch_cud *cud;
 483         int ret, ccode;
 484         struct {
 485                 struct chsc_header request;
 486                 u32 : 2;
 487                 u32 m : 1;
 488                 u32 : 5;
 489                 u32 fmt1 : 4;
 490                 u32 : 2;
 491                 u32 ssid : 2;
 492                 u32 first_sch : 16;
 493                 u32 : 8;
 494                 u32 cssid : 8;
 495                 u32 last_sch : 16;
 496                 u32 : 32;
 497                 struct chsc_header response;
 498                 u8 data[PAGE_SIZE - 20];
 499         } __attribute__ ((packed)) *sscud_area;
 500
 501         sscud_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 502         if (!sscud_area)
 503                 return -ENOMEM;
 504         cud = kzalloc(sizeof(*cud), GFP_KERNEL);
 505         if (!cud) {
 506                 ret = -ENOMEM;
 507                 goto out_free;
 508         }
 509         if (copy_from_user(cud, user_cud, sizeof(*cud))) {
 510                 ret = -EFAULT;
 511                 goto out_free;
 512         }
 513         sscud_area->request.length = 0x0010;
 514         sscud_area->request.code = 0x0006;
 515         sscud_area->m = cud->schid.m;
 516         sscud_area->fmt1 = cud->fmt;
 517         sscud_area->ssid = cud->schid.ssid;
 518         sscud_area->first_sch = cud->schid.sch_no;
 519         sscud_area->cssid = cud->schid.cssid;
 520         sscud_area->last_sch = cud->schid.sch_no;
 521
 522         ccode = chsc(sscud_area);
 523         if (ccode != 0) {
 524                 ret = -EIO;
 525                 goto out_free;
 526         }
 527         if (sscud_area->response.code != 0x0001) {
 528                 ret = -EIO;
 529                 CHSC_MSG(0, "sscud: response code=%x\n",
 530                          sscud_area->response.code);
 531                 goto out_free;
 532         }
 533         memcpy(&cud->scub, &sscud_area->response, sscud_area->response.length);
 534         if (copy_to_user(user_cud, cud, sizeof(*cud)))
 535                 ret = -EFAULT;
 536         else
 537                 ret = 0;
 538 out_free:
 539         kfree(cud);
 540         free_page((unsigned long)sscud_area);
 541         return ret;
 542 }
 543
 544 static int chsc_ioctl_conf_info(void __user *user_ci)
 545 {
 546         struct chsc_conf_info *ci;
 547         int ret, ccode;
 548         struct {
 549                 struct chsc_header request;
 550                 u32 : 2;
 551                 u32 m : 1;
 552                 u32 : 1;
 553                 u32 fmt1 : 4;
 554                 u32 cssid : 8;
 555                 u32 : 6;
 556                 u32 ssid : 2;
 557                 u32 : 8;
 558                 u64 : 64;
 559                 struct chsc_header response;
 560                 u8 data[PAGE_SIZE - 20];
 561         } __attribute__ ((packed)) *sci_area;
 562
 563         sci_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 564         if (!sci_area)
 565                 return -ENOMEM;
 566         ci = kzalloc(sizeof(*ci), GFP_KERNEL);
 567         if (!ci) {
 568                 ret = -ENOMEM;
 569                 goto out_free;
 570         }
 571         if (copy_from_user(ci, user_ci, sizeof(*ci))) {
 572                 ret = -EFAULT;
 573                 goto out_free;
 574         }
 575         sci_area->request.length = 0x0010;
 576         sci_area->request.code = 0x0012;
 577         sci_area->m = ci->id.m;
 578         sci_area->fmt1 = ci->fmt;
 579         sci_area->cssid = ci->id.cssid;
 580         sci_area->ssid = ci->id.ssid;
 581
 582         ccode = chsc(sci_area);
 583         if (ccode != 0) {
 584                 ret = -EIO;
 585                 goto out_free;
 586         }
 587         if (sci_area->response.code != 0x0001) {
 588                 ret = -EIO;
 589                 CHSC_MSG(0, "sci: response code=%x\n",
 590                          sci_area->response.code);
 591                 goto out_free;
 592         }
 593         memcpy(&ci->scid, &sci_area->response, sci_area->response.length);
 594         if (copy_to_user(user_ci, ci, sizeof(*ci)))
 595                 ret = -EFAULT;
 596         else
 597                 ret = 0;
 598 out_free:
 599         kfree(ci);
 600         free_page((unsigned long)sci_area);
 601         return ret;
 602 }
 603
 604 static int chsc_ioctl_conf_comp_list(void __user *user_ccl)
 605 {
 606         struct chsc_comp_list *ccl;
 607         int ret, ccode;
 608         struct {
 609                 struct chsc_header request;
 610                 u32 ctype : 8;
 611                 u32 : 4;
 612                 u32 fmt : 4;
 613                 u32 : 16;
 614                 u64 : 64;
 615                 u32 list_parm[2];
 616                 u64 : 64;
 617                 struct chsc_header response;
 618                 u8 data[PAGE_SIZE - 36];
 619         } __attribute__ ((packed)) *sccl_area;
 620         struct {
 621                 u32 m : 1;
 622                 u32 : 31;
 623                 u32 cssid : 8;
 624                 u32 : 16;
 625                 u32 chpid : 8;
 626         } __attribute__ ((packed)) *chpid_parm;
 627         struct {
 628                 u32 f_cssid : 8;
 629                 u32 l_cssid : 8;
 630                 u32 : 16;
 631                 u32 res;
 632         } __attribute__ ((packed)) *cssids_parm;
 633
 634         sccl_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 635         if (!sccl_area)
 636                 return -ENOMEM;
 637         ccl = kzalloc(sizeof(*ccl), GFP_KERNEL);
 638         if (!ccl) {
 639                 ret = -ENOMEM;
 640                 goto out_free;
 641         }
 642         if (copy_from_user(ccl, user_ccl, sizeof(*ccl))) {
 643                 ret = -EFAULT;
 644                 goto out_free;
 645         }
 646         sccl_area->request.length = 0x0020;
 647         sccl_area->request.code = 0x0030;
 648         sccl_area->fmt = ccl->req.fmt;
 649         sccl_area->ctype = ccl->req.ctype;
 650         switch (sccl_area->ctype) {
 651         case CCL_CU_ON_CHP:
 652         case CCL_IOP_CHP:
 653                 chpid_parm = (void *)&sccl_area->list_parm;
 654                 chpid_parm->m = ccl->req.chpid.m;
 655                 chpid_parm->cssid = ccl->req.chpid.chp.cssid;
 656                 chpid_parm->chpid = ccl->req.chpid.chp.id;
 657                 break;
 658         case CCL_CSS_IMG:
 659         case CCL_CSS_IMG_CONF_CHAR:
 660                 cssids_parm = (void *)&sccl_area->list_parm;
 661                 cssids_parm->f_cssid = ccl->req.cssids.f_cssid;
 662                 cssids_parm->l_cssid = ccl->req.cssids.l_cssid;
 663                 break;
 664         }
 665         ccode = chsc(sccl_area);
 666         if (ccode != 0) {
 667                 ret = -EIO;
 668                 goto out_free;
 669         }
 670         if (sccl_area->response.code != 0x0001) {
 671                 ret = -EIO;
 672                 CHSC_MSG(0, "sccl: response code=%x\n",
 673                          sccl_area->response.code);
 674                 goto out_free;
 675         }
 676         memcpy(&ccl->sccl, &sccl_area->response, sccl_area->response.length);
 677         if (copy_to_user(user_ccl, ccl, sizeof(*ccl)))
 678                 ret = -EFAULT;
 679         else
 680                 ret = 0;
 681 out_free:
 682         kfree(ccl);
 683         free_page((unsigned long)sccl_area);
 684         return ret;
 685 }
 686
 687 static int chsc_ioctl_chpd(void __user *user_chpd)
 688 {
 689         struct chsc_cpd_info *chpd;
 690         int ret;
 691
 692         chpd = kzalloc(sizeof(*chpd), GFP_KERNEL);
 693         if (!chpd)
 694                 return -ENOMEM;
 695         if (copy_from_user(chpd, user_chpd, sizeof(*chpd))) {
 696                 ret = -EFAULT;
 697                 goto out_free;
 698         }
 699         ret = chsc_determine_channel_path_desc(chpd->chpid, chpd->fmt,
 700                                                chpd->rfmt, chpd->c, chpd->m,
 701                                                &chpd->chpdb);
 702         if (ret)
 703                 goto out_free;
 704         if (copy_to_user(user_chpd, chpd, sizeof(*chpd)))
 705                 ret = -EFAULT;
 706 out_free:
 707         kfree(chpd);
 708         return ret;
 709 }
 710
 711 static int chsc_ioctl_dcal(void __user *user_dcal)
 712 {
 713         struct chsc_dcal *dcal;
 714         int ret, ccode;
 715         struct {
 716                 struct chsc_header request;
 717                 u32 atype : 8;
 718                 u32 : 4;
 719                 u32 fmt : 4;
 720                 u32 : 16;
 721                 u32 res0[2];
 722                 u32 list_parm[2];
 723                 u32 res1[2];
 724                 struct chsc_header response;
 725                 u8 data[PAGE_SIZE - 36];
 726         } __attribute__ ((packed)) *sdcal_area;
 727
 728         sdcal_area = (void *)get_zeroed_page(GFP_KERNEL | GFP_DMA);
 729         if (!sdcal_area)
 730                 return -ENOMEM;
 731         dcal = kzalloc(sizeof(*dcal), GFP_KERNEL);
 732         if (!dcal) {
 733                 ret = -ENOMEM;
 734                 goto out_free;
 735         }
 736         if (copy_from_user(dcal, user_dcal, sizeof(*dcal))) {
 737                 ret = -EFAULT;
 738                 goto out_free;
 739         }
 740         sdcal_area->request.length = 0x0020;
 741         sdcal_area->request.code = 0x0034;
 742         sdcal_area->atype = dcal->req.atype;
 743         sdcal_area->fmt = dcal->req.fmt;
 744         memcpy(&sdcal_area->list_parm, &dcal->req.list_parm,
 745                sizeof(sdcal_area->list_parm));
 746
 747         ccode = chsc(sdcal_area);
 748         if (ccode != 0) {
 749                 ret = -EIO;
 750                 goto out_free;
 751         }
 752         if (sdcal_area->response.code != 0x0001) {
 753                 ret = -EIO;
 754                 CHSC_MSG(0, "sdcal: response code=%x\n",
 755                          sdcal_area->response.code);
 756                 goto out_free;
 757         }
 758         memcpy(&dcal->sdcal, &sdcal_area->response,
 759                sdcal_area->response.length);
 760         if (copy_to_user(user_dcal, dcal, sizeof(*dcal)))
 761                 ret = -EFAULT;
 762         else
 763                 ret = 0;
 764 out_free:
 765         kfree(dcal);
 766         free_page((unsigned long)sdcal_area);
 767         return ret;
 768 }
 769
 770 static long chsc_ioctl(struct file *filp, unsigned int cmd,
 771                        unsigned long arg)
 772 {
 773         CHSC_MSG(2, "chsc_ioctl called, cmd=%x\n", cmd);
 774         switch (cmd) {
 775         case CHSC_START:
 776                 return chsc_ioctl_start((void __user *)arg);
 777         case CHSC_INFO_CHANNEL_PATH:
 778                 return chsc_ioctl_info_channel_path((void __user *)arg);
 779         case CHSC_INFO_CU:
 780                 return chsc_ioctl_info_cu((void __user *)arg);
 781         case CHSC_INFO_SCH_CU:
 782                 return chsc_ioctl_info_sch_cu((void __user *)arg);
 783         case CHSC_INFO_CI:
 784                 return chsc_ioctl_conf_info((void __user *)arg);
 785         case CHSC_INFO_CCL:
 786                 return chsc_ioctl_conf_comp_list((void __user *)arg);
 787         case CHSC_INFO_CPD:
 788                 return chsc_ioctl_chpd((void __user *)arg);
 789         case CHSC_INFO_DCAL:
 790                 return chsc_ioctl_dcal((void __user *)arg);
 791         default: /* unknown ioctl number */
 792                 return -ENOIOCTLCMD;
 793         }
 794 }
 795
 796 static const struct file_operations chsc_fops = {
 797         .owner = THIS_MODULE,
 798         .unlocked_ioctl = chsc_ioctl,
 799         .compat_ioctl = chsc_ioctl,
 800 };
 801
 802 static struct miscdevice chsc_misc_device = {
 803         .minor = MISC_DYNAMIC_MINOR,
 804         .name = "chsc",
 805         .fops = &chsc_fops,
 806 };
 807
 808 static int __init chsc_misc_init(void)
 809 {
 810         return misc_register(&chsc_misc_device);
 811 }
 812
 813 static void chsc_misc_cleanup(void)
 814 {
 815         misc_deregister(&chsc_misc_device);
 816 }
 817
 818 static int __init chsc_sch_init(void)
 819 {
 820         int ret;
 821
 822         ret = chsc_init_dbfs();
 823         if (ret)
 824                 return ret;
 825         isc_register(CHSC_SCH_ISC);
 826         ret = chsc_init_sch_driver();
 827         if (ret)
 828                 goto out_dbf;
 829         ret = chsc_misc_init();
 830         if (ret)
 831                 goto out_driver;
 832         return ret;
 833 out_driver:
 834         chsc_cleanup_sch_driver();
 835 out_dbf:
 836         isc_unregister(CHSC_SCH_ISC);
 837         chsc_remove_dbfs();
 838         return ret;
 839 }
 840
 841 static void __exit chsc_sch_exit(void)
 842 {
 843         chsc_misc_cleanup();
 844         chsc_cleanup_sch_driver();
 845         isc_unregister(CHSC_SCH_ISC);
 846         chsc_remove_dbfs();
 847 }
 848
 849 module_init(chsc_sch_init);
 850 module_exit(chsc_sch_exit);