drivers/rapidio/rio.c

   1 /*
   2  * RapidIO interconnect services
   3  * (RapidIO Interconnect Specification, http://www.rapidio.org)
   4  *
   5  * Copyright 2005 MontaVista Software, Inc.
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16
  17 #include <linux/delay.h>
  18 #include <linux/init.h>
  19 #include <linux/rio.h>
  20 #include <linux/rio_drv.h>
  21 #include <linux/rio_ids.h>
  22 #include <linux/rio_regs.h>
  23 #include <linux/module.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27
  28 #include "rio.h"
  29
  30 static LIST_HEAD(rio_mports);
  31
  32 /**
  33  * rio_local_get_device_id - Get the base/extended device id for a port
  34  * @port: RIO master port from which to get the deviceid
  35  *
  36  * Reads the base/extended device id from the local device
  37  * implementing the master port. Returns the 8/16-bit device
  38  * id.
  39  */
  40 u16 rio_local_get_device_id(struct rio_mport *port)
  41 {
  42         u32 result;
  43
  44         rio_local_read_config_32(port, RIO_DID_CSR, &result);
  45
  46         return (RIO_GET_DID(port->sys_size, result));
  47 }
  48
  49 /**
  50  * rio_request_inb_mbox - request inbound mailbox service
  51  * @mport: RIO master port from which to allocate the mailbox resource
  52  * @dev_id: Device specific pointer to pass on event
  53  * @mbox: Mailbox number to claim
  54  * @entries: Number of entries in inbound mailbox queue
  55  * @minb: Callback to execute when inbound message is received
  56  *
  57  * Requests ownership of an inbound mailbox resource and binds
  58  * a callback function to the resource. Returns %0 on success.
  59  */
  60 int rio_request_inb_mbox(struct rio_mport *mport,
  61                          void *dev_id,
  62                          int mbox,
  63                          int entries,
  64                          void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
  65                                        int slot))
  66 {
  67         int rc = 0;
  68
  69         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
  70
  71         if (res) {
  72                 rio_init_mbox_res(res, mbox, mbox);
  73
  74                 /* Make sure this mailbox isn't in use */
  75                 if ((rc =
  76                      request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
  77                                       res)) < 0) {
  78                         kfree(res);
  79                         goto out;
  80                 }
  81
  82                 mport->inb_msg[mbox].res = res;
  83
  84                 /* Hook the inbound message callback */
  85                 mport->inb_msg[mbox].mcback = minb;
  86
  87                 rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
  88         } else
  89                 rc = -ENOMEM;
  90
  91       out:
  92         return rc;
  93 }
  94
  95 /**
  96  * rio_release_inb_mbox - release inbound mailbox message service
  97  * @mport: RIO master port from which to release the mailbox resource
  98  * @mbox: Mailbox number to release
  99  *
 100  * Releases ownership of an inbound mailbox resource. Returns 0
 101  * if the request has been satisfied.
 102  */
 103 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 104 {
 105         rio_close_inb_mbox(mport, mbox);
 106
 107         /* Release the mailbox resource */
 108         return release_resource(mport->inb_msg[mbox].res);
 109 }
 110
 111 /**
 112  * rio_request_outb_mbox - request outbound mailbox service
 113  * @mport: RIO master port from which to allocate the mailbox resource
 114  * @dev_id: Device specific pointer to pass on event
 115  * @mbox: Mailbox number to claim
 116  * @entries: Number of entries in outbound mailbox queue
 117  * @moutb: Callback to execute when outbound message is sent
 118  *
 119  * Requests ownership of an outbound mailbox resource and binds
 120  * a callback function to the resource. Returns 0 on success.
 121  */
 122 int rio_request_outb_mbox(struct rio_mport *mport,
 123                           void *dev_id,
 124                           int mbox,
 125                           int entries,
 126                           void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 127 {
 128         int rc = 0;
 129
 130         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 131
 132         if (res) {
 133                 rio_init_mbox_res(res, mbox, mbox);
 134
 135                 /* Make sure this outbound mailbox isn't in use */
 136                 if ((rc =
 137                      request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 138                                       res)) < 0) {
 139                         kfree(res);
 140                         goto out;
 141                 }
 142
 143                 mport->outb_msg[mbox].res = res;
 144
 145                 /* Hook the inbound message callback */
 146                 mport->outb_msg[mbox].mcback = moutb;
 147
 148                 rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
 149         } else
 150                 rc = -ENOMEM;
 151
 152       out:
 153         return rc;
 154 }
 155
 156 /**
 157  * rio_release_outb_mbox - release outbound mailbox message service
 158  * @mport: RIO master port from which to release the mailbox resource
 159  * @mbox: Mailbox number to release
 160  *
 161  * Releases ownership of an inbound mailbox resource. Returns 0
 162  * if the request has been satisfied.
 163  */
 164 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 165 {
 166         rio_close_outb_mbox(mport, mbox);
 167
 168         /* Release the mailbox resource */
 169         return release_resource(mport->outb_msg[mbox].res);
 170 }
 171
 172 /**
 173  * rio_setup_inb_dbell - bind inbound doorbell callback
 174  * @mport: RIO master port to bind the doorbell callback
 175  * @dev_id: Device specific pointer to pass on event
 176  * @res: Doorbell message resource
 177  * @dinb: Callback to execute when doorbell is received
 178  *
 179  * Adds a doorbell resource/callback pair into a port's
 180  * doorbell event list. Returns 0 if the request has been
 181  * satisfied.
 182  */
 183 static int
 184 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 185                     void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 186                                   u16 info))
 187 {
 188         int rc = 0;
 189         struct rio_dbell *dbell;
 190
 191         if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 192                 rc = -ENOMEM;
 193                 goto out;
 194         }
 195
 196         dbell->res = res;
 197         dbell->dinb = dinb;
 198         dbell->dev_id = dev_id;
 199
 200         list_add_tail(&dbell->node, &mport->dbells);
 201
 202       out:
 203         return rc;
 204 }
 205
 206 /**
 207  * rio_request_inb_dbell - request inbound doorbell message service
 208  * @mport: RIO master port from which to allocate the doorbell resource
 209  * @dev_id: Device specific pointer to pass on event
 210  * @start: Doorbell info range start
 211  * @end: Doorbell info range end
 212  * @dinb: Callback to execute when doorbell is received
 213  *
 214  * Requests ownership of an inbound doorbell resource and binds
 215  * a callback function to the resource. Returns 0 if the request
 216  * has been satisfied.
 217  */
 218 int rio_request_inb_dbell(struct rio_mport *mport,
 219                           void *dev_id,
 220                           u16 start,
 221                           u16 end,
 222                           void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 223                                         u16 dst, u16 info))
 224 {
 225         int rc = 0;
 226
 227         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 228
 229         if (res) {
 230                 rio_init_dbell_res(res, start, end);
 231
 232                 /* Make sure these doorbells aren't in use */
 233                 if ((rc =
 234                      request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 235                                       res)) < 0) {
 236                         kfree(res);
 237                         goto out;
 238                 }
 239
 240                 /* Hook the doorbell callback */
 241                 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 242         } else
 243                 rc = -ENOMEM;
 244
 245       out:
 246         return rc;
 247 }
 248
 249 /**
 250  * rio_release_inb_dbell - release inbound doorbell message service
 251  * @mport: RIO master port from which to release the doorbell resource
 252  * @start: Doorbell info range start
 253  * @end: Doorbell info range end
 254  *
 255  * Releases ownership of an inbound doorbell resource and removes
 256  * callback from the doorbell event list. Returns 0 if the request
 257  * has been satisfied.
 258  */
 259 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 260 {
 261         int rc = 0, found = 0;
 262         struct rio_dbell *dbell;
 263
 264         list_for_each_entry(dbell, &mport->dbells, node) {
 265                 if ((dbell->res->start == start) && (dbell->res->end == end)) {
 266                         found = 1;
 267                         break;
 268                 }
 269         }
 270
 271         /* If we can't find an exact match, fail */
 272         if (!found) {
 273                 rc = -EINVAL;
 274                 goto out;
 275         }
 276
 277         /* Delete from list */
 278         list_del(&dbell->node);
 279
 280         /* Release the doorbell resource */
 281         rc = release_resource(dbell->res);
 282
 283         /* Free the doorbell event */
 284         kfree(dbell);
 285
 286       out:
 287         return rc;
 288 }
 289
 290 /**
 291  * rio_request_outb_dbell - request outbound doorbell message range
 292  * @rdev: RIO device from which to allocate the doorbell resource
 293  * @start: Doorbell message range start
 294  * @end: Doorbell message range end
 295  *
 296  * Requests ownership of a doorbell message range. Returns a resource
 297  * if the request has been satisfied or %NULL on failure.
 298  */
 299 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 300                                         u16 end)
 301 {
 302         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 303
 304         if (res) {
 305                 rio_init_dbell_res(res, start, end);
 306
 307                 /* Make sure these doorbells aren't in use */
 308                 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 309                     < 0) {
 310                         kfree(res);
 311                         res = NULL;
 312                 }
 313         }
 314
 315         return res;
 316 }
 317
 318 /**
 319  * rio_release_outb_dbell - release outbound doorbell message range
 320  * @rdev: RIO device from which to release the doorbell resource
 321  * @res: Doorbell resource to be freed
 322  *
 323  * Releases ownership of a doorbell message range. Returns 0 if the
 324  * request has been satisfied.
 325  */
 326 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 327 {
 328         int rc = release_resource(res);
 329
 330         kfree(res);
 331
 332         return rc;
 333 }
 334
 335 /**
 336  * rio_mport_get_feature - query for devices' extended features
 337  * @port: Master port to issue transaction
 338  * @local: Indicate a local master port or remote device access
 339  * @destid: Destination ID of the device
 340  * @hopcount: Number of switch hops to the device
 341  * @ftr: Extended feature code
 342  *
 343  * Tell if a device supports a given RapidIO capability.
 344  * Returns the offset of the requested extended feature
 345  * block within the device's RIO configuration space or
 346  * 0 in case the device does not support it.  Possible
 347  * values for @ftr:
 348  *
 349  * %RIO_EFB_PAR_EP_ID           LP/LVDS EP Devices
 350  *
 351  * %RIO_EFB_PAR_EP_REC_ID       LP/LVDS EP Recovery Devices
 352  *
 353  * %RIO_EFB_PAR_EP_FREE_ID      LP/LVDS EP Free Devices
 354  *
 355  * %RIO_EFB_SER_EP_ID           LP/Serial EP Devices
 356  *
 357  * %RIO_EFB_SER_EP_REC_ID       LP/Serial EP Recovery Devices
 358  *
 359  * %RIO_EFB_SER_EP_FREE_ID      LP/Serial EP Free Devices
 360  */
 361 u32
 362 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
 363                       u8 hopcount, int ftr)
 364 {
 365         u32 asm_info, ext_ftr_ptr, ftr_header;
 366
 367         if (local)
 368                 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
 369         else
 370                 rio_mport_read_config_32(port, destid, hopcount,
 371                                          RIO_ASM_INFO_CAR, &asm_info);
 372
 373         ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
 374
 375         while (ext_ftr_ptr) {
 376                 if (local)
 377                         rio_local_read_config_32(port, ext_ftr_ptr,
 378                                                  &ftr_header);
 379                 else
 380                         rio_mport_read_config_32(port, destid, hopcount,
 381                                                  ext_ftr_ptr, &ftr_header);
 382                 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
 383                         return ext_ftr_ptr;
 384                 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
 385                         break;
 386         }
 387
 388         return 0;
 389 }
 390
 391 /**
 392  * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
 393  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 394  * @did: RIO did to match or %RIO_ANY_ID to match all dids
 395  * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
 396  * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
 397  * @from: Previous RIO device found in search, or %NULL for new search
 398  *
 399  * Iterates through the list of known RIO devices. If a RIO device is
 400  * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
 401  * count to the device is incrememted and a pointer to its device
 402  * structure is returned. Otherwise, %NULL is returned. A new search
 403  * is initiated by passing %NULL to the @from argument. Otherwise, if
 404  * @from is not %NULL, searches continue from next device on the global
 405  * list. The reference count for @from is always decremented if it is
 406  * not %NULL.
 407  */
 408 struct rio_dev *rio_get_asm(u16 vid, u16 did,
 409                             u16 asm_vid, u16 asm_did, struct rio_dev *from)
 410 {
 411         struct list_head *n;
 412         struct rio_dev *rdev;
 413
 414         WARN_ON(in_interrupt());
 415         spin_lock(&rio_global_list_lock);
 416         n = from ? from->global_list.next : rio_devices.next;
 417
 418         while (n && (n != &rio_devices)) {
 419                 rdev = rio_dev_g(n);
 420                 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
 421                     (did == RIO_ANY_ID || rdev->did == did) &&
 422                     (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
 423                     (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
 424                         goto exit;
 425                 n = n->next;
 426         }
 427         rdev = NULL;
 428       exit:
 429         rio_dev_put(from);
 430         rdev = rio_dev_get(rdev);
 431         spin_unlock(&rio_global_list_lock);
 432         return rdev;
 433 }
 434
 435 /**
 436  * rio_get_device - Begin or continue searching for a RIO device by vid/did
 437  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 438  * @did: RIO did to match or %RIO_ANY_ID to match all dids
 439  * @from: Previous RIO device found in search, or %NULL for new search
 440  *
 441  * Iterates through the list of known RIO devices. If a RIO device is
 442  * found with a matching @vid and @did, the reference count to the
 443  * device is incrememted and a pointer to its device structure is returned.
 444  * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
 445  * to the @from argument. Otherwise, if @from is not %NULL, searches
 446  * continue from next device on the global list. The reference count for
 447  * @from is always decremented if it is not %NULL.
 448  */
 449 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
 450 {
 451         return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
 452 }
 453
 454 static void rio_fixup_device(struct rio_dev *dev)
 455 {
 456 }
 457
 458 static int __devinit rio_init(void)
 459 {
 460         struct rio_dev *dev = NULL;
 461
 462         while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
 463                 rio_fixup_device(dev);
 464         }
 465         return 0;
 466 }
 467
 468 device_initcall(rio_init);
 469
 470 int rio_init_mports(void)
 471 {
 472         int rc = 0;
 473         struct rio_mport *port;
 474
 475         list_for_each_entry(port, &rio_mports, node) {
 476                 if (!request_mem_region(port->iores.start,
 477                                         port->iores.end - port->iores.start,
 478                                         port->name)) {
 479                         printk(KERN_ERR
 480                                "RIO: Error requesting master port region 0x%016llx-0x%016llx\n",
 481                                (u64)port->iores.start, (u64)port->iores.end - 1);
 482                         rc = -ENOMEM;
 483                         goto out;
 484                 }
 485
 486                 if (port->host_deviceid >= 0)
 487                         rio_enum_mport(port);
 488                 else
 489                         rio_disc_mport(port);
 490         }
 491
 492       out:
 493         return rc;
 494 }
 495
 496 void rio_register_mport(struct rio_mport *port)
 497 {
 498         list_add_tail(&port->node, &rio_mports);
 499 }
 500
 501 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
 502 EXPORT_SYMBOL_GPL(rio_get_device);
 503 EXPORT_SYMBOL_GPL(rio_get_asm);
 504 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
 505 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
 506 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
 507 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
 508 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
 509 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
 510 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
 511 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);