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
  27 #include "rio.h"
  28
  29 static LIST_HEAD(rio_mports);
  30
  31 /**
  32  * rio_local_get_device_id - Get the base/extended device id for a port
  33  * @port: RIO master port from which to get the deviceid
  34  *
  35  * Reads the base/extended device id from the local device
  36  * implementing the master port. Returns the 8/16-bit device
  37  * id.
  38  */
  39 u16 rio_local_get_device_id(struct rio_mport *port)
  40 {
  41         u32 result;
  42
  43         rio_local_read_config_32(port, RIO_DID_CSR, &result);
  44
  45         return (RIO_GET_DID(result));
  46 }
  47
  48 /**
  49  * rio_request_inb_mbox - request inbound mailbox service
  50  * @mport: RIO master port from which to allocate the mailbox resource
  51  * @dev_id: Device specific pointer to pass on event
  52  * @mbox: Mailbox number to claim
  53  * @entries: Number of entries in inbound mailbox queue
  54  * @minb: Callback to execute when inbound message is received
  55  *
  56  * Requests ownership of an inbound mailbox resource and binds
  57  * a callback function to the resource. Returns %0 on success.
  58  */
  59 int rio_request_inb_mbox(struct rio_mport *mport,
  60                          void *dev_id,
  61                          int mbox,
  62                          int entries,
  63                          void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
  64                                        int slot))
  65 {
  66         int rc = 0;
  67
  68         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
  69
  70         if (res) {
  71                 rio_init_mbox_res(res, mbox, mbox);
  72
  73                 /* Make sure this mailbox isn't in use */
  74                 if ((rc =
  75                      request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
  76                                       res)) < 0) {
  77                         kfree(res);
  78                         goto out;
  79                 }
  80
  81                 mport->inb_msg[mbox].res = res;
  82
  83                 /* Hook the inbound message callback */
  84                 mport->inb_msg[mbox].mcback = minb;
  85
  86                 rc = rio_open_inb_mbox(mport, dev_id, mbox, entries);
  87         } else
  88                 rc = -ENOMEM;
  89
  90       out:
  91         return rc;
  92 }
  93
  94 /**
  95  * rio_release_inb_mbox - release inbound mailbox message service
  96  * @mport: RIO master port from which to release the mailbox resource
  97  * @mbox: Mailbox number to release
  98  *
  99  * Releases ownership of an inbound mailbox resource. Returns 0
 100  * if the request has been satisfied.
 101  */
 102 int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 103 {
 104         rio_close_inb_mbox(mport, mbox);
 105
 106         /* Release the mailbox resource */
 107         return release_resource(mport->inb_msg[mbox].res);
 108 }
 109
 110 /**
 111  * rio_request_outb_mbox - request outbound mailbox service
 112  * @mport: RIO master port from which to allocate the mailbox resource
 113  * @dev_id: Device specific pointer to pass on event
 114  * @mbox: Mailbox number to claim
 115  * @entries: Number of entries in outbound mailbox queue
 116  * @moutb: Callback to execute when outbound message is sent
 117  *
 118  * Requests ownership of an outbound mailbox resource and binds
 119  * a callback function to the resource. Returns 0 on success.
 120  */
 121 int rio_request_outb_mbox(struct rio_mport *mport,
 122                           void *dev_id,
 123                           int mbox,
 124                           int entries,
 125                           void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 126 {
 127         int rc = 0;
 128
 129         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 130
 131         if (res) {
 132                 rio_init_mbox_res(res, mbox, mbox);
 133
 134                 /* Make sure this outbound mailbox isn't in use */
 135                 if ((rc =
 136                      request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 137                                       res)) < 0) {
 138                         kfree(res);
 139                         goto out;
 140                 }
 141
 142                 mport->outb_msg[mbox].res = res;
 143
 144                 /* Hook the inbound message callback */
 145                 mport->outb_msg[mbox].mcback = moutb;
 146
 147                 rc = rio_open_outb_mbox(mport, dev_id, mbox, entries);
 148         } else
 149                 rc = -ENOMEM;
 150
 151       out:
 152         return rc;
 153 }
 154
 155 /**
 156  * rio_release_outb_mbox - release outbound mailbox message service
 157  * @mport: RIO master port from which to release the mailbox resource
 158  * @mbox: Mailbox number to release
 159  *
 160  * Releases ownership of an inbound mailbox resource. Returns 0
 161  * if the request has been satisfied.
 162  */
 163 int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 164 {
 165         rio_close_outb_mbox(mport, mbox);
 166
 167         /* Release the mailbox resource */
 168         return release_resource(mport->outb_msg[mbox].res);
 169 }
 170
 171 /**
 172  * rio_setup_inb_dbell - bind inbound doorbell callback
 173  * @mport: RIO master port to bind the doorbell callback
 174  * @dev_id: Device specific pointer to pass on event
 175  * @res: Doorbell message resource
 176  * @dinb: Callback to execute when doorbell is received
 177  *
 178  * Adds a doorbell resource/callback pair into a port's
 179  * doorbell event list. Returns 0 if the request has been
 180  * satisfied.
 181  */
 182 static int
 183 rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 184                     void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 185                                   u16 info))
 186 {
 187         int rc = 0;
 188         struct rio_dbell *dbell;
 189
 190         if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 191                 rc = -ENOMEM;
 192                 goto out;
 193         }
 194
 195         dbell->res = res;
 196         dbell->dinb = dinb;
 197         dbell->dev_id = dev_id;
 198
 199         list_add_tail(&dbell->node, &mport->dbells);
 200
 201       out:
 202         return rc;
 203 }
 204
 205 /**
 206  * rio_request_inb_dbell - request inbound doorbell message service
 207  * @mport: RIO master port from which to allocate the doorbell resource
 208  * @dev_id: Device specific pointer to pass on event
 209  * @start: Doorbell info range start
 210  * @end: Doorbell info range end
 211  * @dinb: Callback to execute when doorbell is received
 212  *
 213  * Requests ownership of an inbound doorbell resource and binds
 214  * a callback function to the resource. Returns 0 if the request
 215  * has been satisfied.
 216  */
 217 int rio_request_inb_dbell(struct rio_mport *mport,
 218                           void *dev_id,
 219                           u16 start,
 220                           u16 end,
 221                           void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 222                                         u16 dst, u16 info))
 223 {
 224         int rc = 0;
 225
 226         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 227
 228         if (res) {
 229                 rio_init_dbell_res(res, start, end);
 230
 231                 /* Make sure these doorbells aren't in use */
 232                 if ((rc =
 233                      request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 234                                       res)) < 0) {
 235                         kfree(res);
 236                         goto out;
 237                 }
 238
 239                 /* Hook the doorbell callback */
 240                 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 241         } else
 242                 rc = -ENOMEM;
 243
 244       out:
 245         return rc;
 246 }
 247
 248 /**
 249  * rio_release_inb_dbell - release inbound doorbell message service
 250  * @mport: RIO master port from which to release the doorbell resource
 251  * @start: Doorbell info range start
 252  * @end: Doorbell info range end
 253  *
 254  * Releases ownership of an inbound doorbell resource and removes
 255  * callback from the doorbell event list. Returns 0 if the request
 256  * has been satisfied.
 257  */
 258 int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 259 {
 260         int rc = 0, found = 0;
 261         struct rio_dbell *dbell;
 262
 263         list_for_each_entry(dbell, &mport->dbells, node) {
 264                 if ((dbell->res->start == start) && (dbell->res->end == end)) {
 265                         found = 1;
 266                         break;
 267                 }
 268         }
 269
 270         /* If we can't find an exact match, fail */
 271         if (!found) {
 272                 rc = -EINVAL;
 273                 goto out;
 274         }
 275
 276         /* Delete from list */
 277         list_del(&dbell->node);
 278
 279         /* Release the doorbell resource */
 280         rc = release_resource(dbell->res);
 281
 282         /* Free the doorbell event */
 283         kfree(dbell);
 284
 285       out:
 286         return rc;
 287 }
 288
 289 /**
 290  * rio_request_outb_dbell - request outbound doorbell message range
 291  * @rdev: RIO device from which to allocate the doorbell resource
 292  * @start: Doorbell message range start
 293  * @end: Doorbell message range end
 294  *
 295  * Requests ownership of a doorbell message range. Returns a resource
 296  * if the request has been satisfied or %NULL on failure.
 297  */
 298 struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 299                                         u16 end)
 300 {
 301         struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 302
 303         if (res) {
 304                 rio_init_dbell_res(res, start, end);
 305
 306                 /* Make sure these doorbells aren't in use */
 307                 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 308                     < 0) {
 309                         kfree(res);
 310                         res = NULL;
 311                 }
 312         }
 313
 314         return res;
 315 }
 316
 317 /**
 318  * rio_release_outb_dbell - release outbound doorbell message range
 319  * @rdev: RIO device from which to release the doorbell resource
 320  * @res: Doorbell resource to be freed
 321  *
 322  * Releases ownership of a doorbell message range. Returns 0 if the
 323  * request has been satisfied.
 324  */
 325 int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 326 {
 327         int rc = release_resource(res);
 328
 329         kfree(res);
 330
 331         return rc;
 332 }
 333
 334 /**
 335  * rio_mport_get_feature - query for devices' extended features
 336  * @port: Master port to issue transaction
 337  * @local: Indicate a local master port or remote device access
 338  * @destid: Destination ID of the device
 339  * @hopcount: Number of switch hops to the device
 340  * @ftr: Extended feature code
 341  *
 342  * Tell if a device supports a given RapidIO capability.
 343  * Returns the offset of the requested extended feature
 344  * block within the device's RIO configuration space or
 345  * 0 in case the device does not support it.  Possible
 346  * values for @ftr:
 347  *
 348  * %RIO_EFB_PAR_EP_ID           LP/LVDS EP Devices
 349  *
 350  * %RIO_EFB_PAR_EP_REC_ID       LP/LVDS EP Recovery Devices
 351  *
 352  * %RIO_EFB_PAR_EP_FREE_ID      LP/LVDS EP Free Devices
 353  *
 354  * %RIO_EFB_SER_EP_ID           LP/Serial EP Devices
 355  *
 356  * %RIO_EFB_SER_EP_REC_ID       LP/Serial EP Recovery Devices
 357  *
 358  * %RIO_EFB_SER_EP_FREE_ID      LP/Serial EP Free Devices
 359  */
 360 u32
 361 rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
 362                       u8 hopcount, int ftr)
 363 {
 364         u32 asm_info, ext_ftr_ptr, ftr_header;
 365
 366         if (local)
 367                 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
 368         else
 369                 rio_mport_read_config_32(port, destid, hopcount,
 370                                          RIO_ASM_INFO_CAR, &asm_info);
 371
 372         ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
 373
 374         while (ext_ftr_ptr) {
 375                 if (local)
 376                         rio_local_read_config_32(port, ext_ftr_ptr,
 377                                                  &ftr_header);
 378                 else
 379                         rio_mport_read_config_32(port, destid, hopcount,
 380                                                  ext_ftr_ptr, &ftr_header);
 381                 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
 382                         return ext_ftr_ptr;
 383                 if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
 384                         break;
 385         }
 386
 387         return 0;
 388 }
 389
 390 /**
 391  * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
 392  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 393  * @did: RIO did to match or %RIO_ANY_ID to match all dids
 394  * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
 395  * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
 396  * @from: Previous RIO device found in search, or %NULL for new search
 397  *
 398  * Iterates through the list of known RIO devices. If a RIO device is
 399  * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
 400  * count to the device is incrememted and a pointer to its device
 401  * structure is returned. Otherwise, %NULL is returned. A new search
 402  * is initiated by passing %NULL to the @from argument. Otherwise, if
 403  * @from is not %NULL, searches continue from next device on the global
 404  * list. The reference count for @from is always decremented if it is
 405  * not %NULL.
 406  */
 407 struct rio_dev *rio_get_asm(u16 vid, u16 did,
 408                             u16 asm_vid, u16 asm_did, struct rio_dev *from)
 409 {
 410         struct list_head *n;
 411         struct rio_dev *rdev;
 412
 413         WARN_ON(in_interrupt());
 414         spin_lock(&rio_global_list_lock);
 415         n = from ? from->global_list.next : rio_devices.next;
 416
 417         while (n && (n != &rio_devices)) {
 418                 rdev = rio_dev_g(n);
 419                 if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
 420                     (did == RIO_ANY_ID || rdev->did == did) &&
 421                     (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
 422                     (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
 423                         goto exit;
 424                 n = n->next;
 425         }
 426         rdev = NULL;
 427       exit:
 428         rio_dev_put(from);
 429         rdev = rio_dev_get(rdev);
 430         spin_unlock(&rio_global_list_lock);
 431         return rdev;
 432 }
 433
 434 /**
 435  * rio_get_device - Begin or continue searching for a RIO device by vid/did
 436  * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
 437  * @did: RIO did to match or %RIO_ANY_ID to match all dids
 438  * @from: Previous RIO device found in search, or %NULL for new search
 439  *
 440  * Iterates through the list of known RIO devices. If a RIO device is
 441  * found with a matching @vid and @did, the reference count to the
 442  * device is incrememted and a pointer to its device structure is returned.
 443  * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
 444  * to the @from argument. Otherwise, if @from is not %NULL, searches
 445  * continue from next device on the global list. The reference count for
 446  * @from is always decremented if it is not %NULL.
 447  */
 448 struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
 449 {
 450         return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
 451 }
 452
 453 static void rio_fixup_device(struct rio_dev *dev)
 454 {
 455 }
 456
 457 static int __devinit rio_init(void)
 458 {
 459         struct rio_dev *dev = NULL;
 460
 461         while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
 462                 rio_fixup_device(dev);
 463         }
 464         return 0;
 465 }
 466
 467 device_initcall(rio_init);
 468
 469 int rio_init_mports(void)
 470 {
 471         int rc = 0;
 472         struct rio_mport *port;
 473
 474         list_for_each_entry(port, &rio_mports, node) {
 475                 if (!request_mem_region(port->iores.start,
 476                                         port->iores.end - port->iores.start,
 477                                         port->name)) {
 478                         printk(KERN_ERR
 479                                "RIO: Error requesting master port region %8.8lx-%8.8lx\n",
 480                                port->iores.start, port->iores.end - 1);
 481                         rc = -ENOMEM;
 482                         goto out;
 483                 }
 484
 485                 if (port->host_deviceid >= 0)
 486                         rio_enum_mport(port);
 487                 else
 488                         rio_disc_mport(port);
 489         }
 490
 491       out:
 492         return rc;
 493 }
 494
 495 void rio_register_mport(struct rio_mport *port)
 496 {
 497         list_add_tail(&port->node, &rio_mports);
 498 }
 499
 500 EXPORT_SYMBOL_GPL(rio_local_get_device_id);
 501 EXPORT_SYMBOL_GPL(rio_get_device);
 502 EXPORT_SYMBOL_GPL(rio_get_asm);
 503 EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
 504 EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
 505 EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
 506 EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
 507 EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
 508 EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
 509 EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
 510 EXPORT_SYMBOL_GPL(rio_release_outb_mbox);