linux/drivers/rapidio/rio.c
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   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 * Copyright 2009 Integrated Device Technology, Inc.
   9 * Alex Bounine <alexandre.bounine@idt.com>
  10 * - Added Port-Write/Error Management initialization and handling
  11 *
  12 * This program is free software; you can redistribute  it and/or modify it
  13 * under  the terms of  the GNU General  Public License as published by the
  14 * Free Software Foundation;  either version 2 of the  License, or (at your
  15 * option) any later version.
  16 */
  17
  18#include <linux/types.h>
  19#include <linux/kernel.h>
  20
  21#include <linux/delay.h>
  22#include <linux/init.h>
  23#include <linux/rio.h>
  24#include <linux/rio_drv.h>
  25#include <linux/rio_ids.h>
  26#include <linux/rio_regs.h>
  27#include <linux/module.h>
  28#include <linux/spinlock.h>
  29#include <linux/slab.h>
  30#include <linux/interrupt.h>
  31
  32#include "rio.h"
  33
  34static LIST_HEAD(rio_devices);
  35static DEFINE_SPINLOCK(rio_global_list_lock);
  36
  37static LIST_HEAD(rio_mports);
  38static DEFINE_MUTEX(rio_mport_list_lock);
  39static unsigned char next_portid;
  40static DEFINE_SPINLOCK(rio_mmap_lock);
  41
  42/**
  43 * rio_local_get_device_id - Get the base/extended device id for a port
  44 * @port: RIO master port from which to get the deviceid
  45 *
  46 * Reads the base/extended device id from the local device
  47 * implementing the master port. Returns the 8/16-bit device
  48 * id.
  49 */
  50u16 rio_local_get_device_id(struct rio_mport *port)
  51{
  52        u32 result;
  53
  54        rio_local_read_config_32(port, RIO_DID_CSR, &result);
  55
  56        return (RIO_GET_DID(port->sys_size, result));
  57}
  58
  59/**
  60 * rio_add_device- Adds a RIO device to the device model
  61 * @rdev: RIO device
  62 *
  63 * Adds the RIO device to the global device list and adds the RIO
  64 * device to the RIO device list.  Creates the generic sysfs nodes
  65 * for an RIO device.
  66 */
  67int rio_add_device(struct rio_dev *rdev)
  68{
  69        int err;
  70
  71        err = device_add(&rdev->dev);
  72        if (err)
  73                return err;
  74
  75        spin_lock(&rio_global_list_lock);
  76        list_add_tail(&rdev->global_list, &rio_devices);
  77        spin_unlock(&rio_global_list_lock);
  78
  79        rio_create_sysfs_dev_files(rdev);
  80
  81        return 0;
  82}
  83EXPORT_SYMBOL_GPL(rio_add_device);
  84
  85/**
  86 * rio_request_inb_mbox - request inbound mailbox service
  87 * @mport: RIO master port from which to allocate the mailbox resource
  88 * @dev_id: Device specific pointer to pass on event
  89 * @mbox: Mailbox number to claim
  90 * @entries: Number of entries in inbound mailbox queue
  91 * @minb: Callback to execute when inbound message is received
  92 *
  93 * Requests ownership of an inbound mailbox resource and binds
  94 * a callback function to the resource. Returns %0 on success.
  95 */
  96int rio_request_inb_mbox(struct rio_mport *mport,
  97                         void *dev_id,
  98                         int mbox,
  99                         int entries,
 100                         void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,
 101                                       int slot))
 102{
 103        int rc = -ENOSYS;
 104        struct resource *res;
 105
 106        if (mport->ops->open_inb_mbox == NULL)
 107                goto out;
 108
 109        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 110
 111        if (res) {
 112                rio_init_mbox_res(res, mbox, mbox);
 113
 114                /* Make sure this mailbox isn't in use */
 115                if ((rc =
 116                     request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],
 117                                      res)) < 0) {
 118                        kfree(res);
 119                        goto out;
 120                }
 121
 122                mport->inb_msg[mbox].res = res;
 123
 124                /* Hook the inbound message callback */
 125                mport->inb_msg[mbox].mcback = minb;
 126
 127                rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);
 128        } else
 129                rc = -ENOMEM;
 130
 131      out:
 132        return rc;
 133}
 134
 135/**
 136 * rio_release_inb_mbox - release inbound mailbox message service
 137 * @mport: RIO master port from which to release the mailbox resource
 138 * @mbox: Mailbox number to release
 139 *
 140 * Releases ownership of an inbound mailbox resource. Returns 0
 141 * if the request has been satisfied.
 142 */
 143int rio_release_inb_mbox(struct rio_mport *mport, int mbox)
 144{
 145        if (mport->ops->close_inb_mbox) {
 146                mport->ops->close_inb_mbox(mport, mbox);
 147
 148                /* Release the mailbox resource */
 149                return release_resource(mport->inb_msg[mbox].res);
 150        } else
 151                return -ENOSYS;
 152}
 153
 154/**
 155 * rio_request_outb_mbox - request outbound mailbox service
 156 * @mport: RIO master port from which to allocate the mailbox resource
 157 * @dev_id: Device specific pointer to pass on event
 158 * @mbox: Mailbox number to claim
 159 * @entries: Number of entries in outbound mailbox queue
 160 * @moutb: Callback to execute when outbound message is sent
 161 *
 162 * Requests ownership of an outbound mailbox resource and binds
 163 * a callback function to the resource. Returns 0 on success.
 164 */
 165int rio_request_outb_mbox(struct rio_mport *mport,
 166                          void *dev_id,
 167                          int mbox,
 168                          int entries,
 169                          void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))
 170{
 171        int rc = -ENOSYS;
 172        struct resource *res;
 173
 174        if (mport->ops->open_outb_mbox == NULL)
 175                goto out;
 176
 177        res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 178
 179        if (res) {
 180                rio_init_mbox_res(res, mbox, mbox);
 181
 182                /* Make sure this outbound mailbox isn't in use */
 183                if ((rc =
 184                     request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],
 185                                      res)) < 0) {
 186                        kfree(res);
 187                        goto out;
 188                }
 189
 190                mport->outb_msg[mbox].res = res;
 191
 192                /* Hook the inbound message callback */
 193                mport->outb_msg[mbox].mcback = moutb;
 194
 195                rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);
 196        } else
 197                rc = -ENOMEM;
 198
 199      out:
 200        return rc;
 201}
 202
 203/**
 204 * rio_release_outb_mbox - release outbound mailbox message service
 205 * @mport: RIO master port from which to release the mailbox resource
 206 * @mbox: Mailbox number to release
 207 *
 208 * Releases ownership of an inbound mailbox resource. Returns 0
 209 * if the request has been satisfied.
 210 */
 211int rio_release_outb_mbox(struct rio_mport *mport, int mbox)
 212{
 213        if (mport->ops->close_outb_mbox) {
 214                mport->ops->close_outb_mbox(mport, mbox);
 215
 216                /* Release the mailbox resource */
 217                return release_resource(mport->outb_msg[mbox].res);
 218        } else
 219                return -ENOSYS;
 220}
 221
 222/**
 223 * rio_setup_inb_dbell - bind inbound doorbell callback
 224 * @mport: RIO master port to bind the doorbell callback
 225 * @dev_id: Device specific pointer to pass on event
 226 * @res: Doorbell message resource
 227 * @dinb: Callback to execute when doorbell is received
 228 *
 229 * Adds a doorbell resource/callback pair into a port's
 230 * doorbell event list. Returns 0 if the request has been
 231 * satisfied.
 232 */
 233static int
 234rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,
 235                    void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,
 236                                  u16 info))
 237{
 238        int rc = 0;
 239        struct rio_dbell *dbell;
 240
 241        if (!(dbell = kmalloc(sizeof(struct rio_dbell), GFP_KERNEL))) {
 242                rc = -ENOMEM;
 243                goto out;
 244        }
 245
 246        dbell->res = res;
 247        dbell->dinb = dinb;
 248        dbell->dev_id = dev_id;
 249
 250        list_add_tail(&dbell->node, &mport->dbells);
 251
 252      out:
 253        return rc;
 254}
 255
 256/**
 257 * rio_request_inb_dbell - request inbound doorbell message service
 258 * @mport: RIO master port from which to allocate the doorbell resource
 259 * @dev_id: Device specific pointer to pass on event
 260 * @start: Doorbell info range start
 261 * @end: Doorbell info range end
 262 * @dinb: Callback to execute when doorbell is received
 263 *
 264 * Requests ownership of an inbound doorbell resource and binds
 265 * a callback function to the resource. Returns 0 if the request
 266 * has been satisfied.
 267 */
 268int rio_request_inb_dbell(struct rio_mport *mport,
 269                          void *dev_id,
 270                          u16 start,
 271                          u16 end,
 272                          void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,
 273                                        u16 dst, u16 info))
 274{
 275        int rc = 0;
 276
 277        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 278
 279        if (res) {
 280                rio_init_dbell_res(res, start, end);
 281
 282                /* Make sure these doorbells aren't in use */
 283                if ((rc =
 284                     request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],
 285                                      res)) < 0) {
 286                        kfree(res);
 287                        goto out;
 288                }
 289
 290                /* Hook the doorbell callback */
 291                rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);
 292        } else
 293                rc = -ENOMEM;
 294
 295      out:
 296        return rc;
 297}
 298
 299/**
 300 * rio_release_inb_dbell - release inbound doorbell message service
 301 * @mport: RIO master port from which to release the doorbell resource
 302 * @start: Doorbell info range start
 303 * @end: Doorbell info range end
 304 *
 305 * Releases ownership of an inbound doorbell resource and removes
 306 * callback from the doorbell event list. Returns 0 if the request
 307 * has been satisfied.
 308 */
 309int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)
 310{
 311        int rc = 0, found = 0;
 312        struct rio_dbell *dbell;
 313
 314        list_for_each_entry(dbell, &mport->dbells, node) {
 315                if ((dbell->res->start == start) && (dbell->res->end == end)) {
 316                        found = 1;
 317                        break;
 318                }
 319        }
 320
 321        /* If we can't find an exact match, fail */
 322        if (!found) {
 323                rc = -EINVAL;
 324                goto out;
 325        }
 326
 327        /* Delete from list */
 328        list_del(&dbell->node);
 329
 330        /* Release the doorbell resource */
 331        rc = release_resource(dbell->res);
 332
 333        /* Free the doorbell event */
 334        kfree(dbell);
 335
 336      out:
 337        return rc;
 338}
 339
 340/**
 341 * rio_request_outb_dbell - request outbound doorbell message range
 342 * @rdev: RIO device from which to allocate the doorbell resource
 343 * @start: Doorbell message range start
 344 * @end: Doorbell message range end
 345 *
 346 * Requests ownership of a doorbell message range. Returns a resource
 347 * if the request has been satisfied or %NULL on failure.
 348 */
 349struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,
 350                                        u16 end)
 351{
 352        struct resource *res = kmalloc(sizeof(struct resource), GFP_KERNEL);
 353
 354        if (res) {
 355                rio_init_dbell_res(res, start, end);
 356
 357                /* Make sure these doorbells aren't in use */
 358                if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)
 359                    < 0) {
 360                        kfree(res);
 361                        res = NULL;
 362                }
 363        }
 364
 365        return res;
 366}
 367
 368/**
 369 * rio_release_outb_dbell - release outbound doorbell message range
 370 * @rdev: RIO device from which to release the doorbell resource
 371 * @res: Doorbell resource to be freed
 372 *
 373 * Releases ownership of a doorbell message range. Returns 0 if the
 374 * request has been satisfied.
 375 */
 376int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)
 377{
 378        int rc = release_resource(res);
 379
 380        kfree(res);
 381
 382        return rc;
 383}
 384
 385/**
 386 * rio_request_inb_pwrite - request inbound port-write message service
 387 * @rdev: RIO device to which register inbound port-write callback routine
 388 * @pwcback: Callback routine to execute when port-write is received
 389 *
 390 * Binds a port-write callback function to the RapidIO device.
 391 * Returns 0 if the request has been satisfied.
 392 */
 393int rio_request_inb_pwrite(struct rio_dev *rdev,
 394        int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))
 395{
 396        int rc = 0;
 397
 398        spin_lock(&rio_global_list_lock);
 399        if (rdev->pwcback != NULL)
 400                rc = -ENOMEM;
 401        else
 402                rdev->pwcback = pwcback;
 403
 404        spin_unlock(&rio_global_list_lock);
 405        return rc;
 406}
 407EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);
 408
 409/**
 410 * rio_release_inb_pwrite - release inbound port-write message service
 411 * @rdev: RIO device which registered for inbound port-write callback
 412 *
 413 * Removes callback from the rio_dev structure. Returns 0 if the request
 414 * has been satisfied.
 415 */
 416int rio_release_inb_pwrite(struct rio_dev *rdev)
 417{
 418        int rc = -ENOMEM;
 419
 420        spin_lock(&rio_global_list_lock);
 421        if (rdev->pwcback) {
 422                rdev->pwcback = NULL;
 423                rc = 0;
 424        }
 425
 426        spin_unlock(&rio_global_list_lock);
 427        return rc;
 428}
 429EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);
 430
 431/**
 432 * rio_map_inb_region -- Map inbound memory region.
 433 * @mport: Master port.
 434 * @local: physical address of memory region to be mapped
 435 * @rbase: RIO base address assigned to this window
 436 * @size: Size of the memory region
 437 * @rflags: Flags for mapping.
 438 *
 439 * Return: 0 -- Success.
 440 *
 441 * This function will create the mapping from RIO space to local memory.
 442 */
 443int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,
 444                        u64 rbase, u32 size, u32 rflags)
 445{
 446        int rc = 0;
 447        unsigned long flags;
 448
 449        if (!mport->ops->map_inb)
 450                return -1;
 451        spin_lock_irqsave(&rio_mmap_lock, flags);
 452        rc = mport->ops->map_inb(mport, local, rbase, size, rflags);
 453        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 454        return rc;
 455}
 456EXPORT_SYMBOL_GPL(rio_map_inb_region);
 457
 458/**
 459 * rio_unmap_inb_region -- Unmap the inbound memory region
 460 * @mport: Master port
 461 * @lstart: physical address of memory region to be unmapped
 462 */
 463void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)
 464{
 465        unsigned long flags;
 466        if (!mport->ops->unmap_inb)
 467                return;
 468        spin_lock_irqsave(&rio_mmap_lock, flags);
 469        mport->ops->unmap_inb(mport, lstart);
 470        spin_unlock_irqrestore(&rio_mmap_lock, flags);
 471}
 472EXPORT_SYMBOL_GPL(rio_unmap_inb_region);
 473
 474/**
 475 * rio_mport_get_physefb - Helper function that returns register offset
 476 *                      for Physical Layer Extended Features Block.
 477 * @port: Master port to issue transaction
 478 * @local: Indicate a local master port or remote device access
 479 * @destid: Destination ID of the device
 480 * @hopcount: Number of switch hops to the device
 481 */
 482u32
 483rio_mport_get_physefb(struct rio_mport *port, int local,
 484                      u16 destid, u8 hopcount)
 485{
 486        u32 ext_ftr_ptr;
 487        u32 ftr_header;
 488
 489        ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);
 490
 491        while (ext_ftr_ptr)  {
 492                if (local)
 493                        rio_local_read_config_32(port, ext_ftr_ptr,
 494                                                 &ftr_header);
 495                else
 496                        rio_mport_read_config_32(port, destid, hopcount,
 497                                                 ext_ftr_ptr, &ftr_header);
 498
 499                ftr_header = RIO_GET_BLOCK_ID(ftr_header);
 500                switch (ftr_header) {
 501
 502                case RIO_EFB_SER_EP_ID_V13P:
 503                case RIO_EFB_SER_EP_REC_ID_V13P:
 504                case RIO_EFB_SER_EP_FREE_ID_V13P:
 505                case RIO_EFB_SER_EP_ID:
 506                case RIO_EFB_SER_EP_REC_ID:
 507                case RIO_EFB_SER_EP_FREE_ID:
 508                case RIO_EFB_SER_EP_FREC_ID:
 509
 510                        return ext_ftr_ptr;
 511
 512                default:
 513                        break;
 514                }
 515
 516                ext_ftr_ptr = rio_mport_get_efb(port, local, destid,
 517                                                hopcount, ext_ftr_ptr);
 518        }
 519
 520        return ext_ftr_ptr;
 521}
 522EXPORT_SYMBOL_GPL(rio_mport_get_physefb);
 523
 524/**
 525 * rio_get_comptag - Begin or continue searching for a RIO device by component tag
 526 * @comp_tag: RIO component tag to match
 527 * @from: Previous RIO device found in search, or %NULL for new search
 528 *
 529 * Iterates through the list of known RIO devices. If a RIO device is
 530 * found with a matching @comp_tag, a pointer to its device
 531 * structure is returned. Otherwise, %NULL is returned. A new search
 532 * is initiated by passing %NULL to the @from argument. Otherwise, if
 533 * @from is not %NULL, searches continue from next device on the global
 534 * list.
 535 */
 536struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)
 537{
 538        struct list_head *n;
 539        struct rio_dev *rdev;
 540
 541        spin_lock(&rio_global_list_lock);
 542        n = from ? from->global_list.next : rio_devices.next;
 543
 544        while (n && (n != &rio_devices)) {
 545                rdev = rio_dev_g(n);
 546                if (rdev->comp_tag == comp_tag)
 547                        goto exit;
 548                n = n->next;
 549        }
 550        rdev = NULL;
 551exit:
 552        spin_unlock(&rio_global_list_lock);
 553        return rdev;
 554}
 555EXPORT_SYMBOL_GPL(rio_get_comptag);
 556
 557/**
 558 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.
 559 * @rdev: Pointer to RIO device control structure
 560 * @pnum: Switch port number to set LOCKOUT bit
 561 * @lock: Operation : set (=1) or clear (=0)
 562 */
 563int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)
 564{
 565        u32 regval;
 566
 567        rio_read_config_32(rdev,
 568                                 rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 569                                 &regval);
 570        if (lock)
 571                regval |= RIO_PORT_N_CTL_LOCKOUT;
 572        else
 573                regval &= ~RIO_PORT_N_CTL_LOCKOUT;
 574
 575        rio_write_config_32(rdev,
 576                                  rdev->phys_efptr + RIO_PORT_N_CTL_CSR(pnum),
 577                                  regval);
 578        return 0;
 579}
 580EXPORT_SYMBOL_GPL(rio_set_port_lockout);
 581
 582/**
 583 * rio_switch_init - Sets switch operations for a particular vendor switch
 584 * @rdev: RIO device
 585 * @do_enum: Enumeration/Discovery mode flag
 586 *
 587 * Searches the RIO switch ops table for known switch types. If the vid
 588 * and did match a switch table entry, then call switch initialization
 589 * routine to setup switch-specific routines.
 590 */
 591void rio_switch_init(struct rio_dev *rdev, int do_enum)
 592{
 593        struct rio_switch_ops *cur = __start_rio_switch_ops;
 594        struct rio_switch_ops *end = __end_rio_switch_ops;
 595
 596        while (cur < end) {
 597                if ((cur->vid == rdev->vid) && (cur->did == rdev->did)) {
 598                        pr_debug("RIO: calling init routine for %s\n",
 599                                 rio_name(rdev));
 600                        cur->init_hook(rdev, do_enum);
 601                        break;
 602                }
 603                cur++;
 604        }
 605
 606        if ((cur >= end) && (rdev->pef & RIO_PEF_STD_RT)) {
 607                pr_debug("RIO: adding STD routing ops for %s\n",
 608                        rio_name(rdev));
 609                rdev->rswitch->add_entry = rio_std_route_add_entry;
 610                rdev->rswitch->get_entry = rio_std_route_get_entry;
 611                rdev->rswitch->clr_table = rio_std_route_clr_table;
 612        }
 613
 614        if (!rdev->rswitch->add_entry || !rdev->rswitch->get_entry)
 615                printk(KERN_ERR "RIO: missing routing ops for %s\n",
 616                       rio_name(rdev));
 617}
 618EXPORT_SYMBOL_GPL(rio_switch_init);
 619
 620/**
 621 * rio_enable_rx_tx_port - enable input receiver and output transmitter of
 622 * given port
 623 * @port: Master port associated with the RIO network
 624 * @local: local=1 select local port otherwise a far device is reached
 625 * @destid: Destination ID of the device to check host bit
 626 * @hopcount: Number of hops to reach the target
 627 * @port_num: Port (-number on switch) to enable on a far end device
 628 *
 629 * Returns 0 or 1 from on General Control Command and Status Register
 630 * (EXT_PTR+0x3C)
 631 */
 632int rio_enable_rx_tx_port(struct rio_mport *port,
 633                          int local, u16 destid,
 634                          u8 hopcount, u8 port_num)
 635{
 636#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS
 637        u32 regval;
 638        u32 ext_ftr_ptr;
 639
 640        /*
 641        * enable rx input tx output port
 642        */
 643        pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "
 644                 "%d, port_num = %d)\n", local, destid, hopcount, port_num);
 645
 646        ext_ftr_ptr = rio_mport_get_physefb(port, local, destid, hopcount);
 647
 648        if (local) {
 649                rio_local_read_config_32(port, ext_ftr_ptr +
 650                                RIO_PORT_N_CTL_CSR(0),
 651                                &regval);
 652        } else {
 653                if (rio_mport_read_config_32(port, destid, hopcount,
 654                ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), &regval) < 0)
 655                        return -EIO;
 656        }
 657
 658        if (regval & RIO_PORT_N_CTL_P_TYP_SER) {
 659                /* serial */
 660                regval = regval | RIO_PORT_N_CTL_EN_RX_SER
 661                                | RIO_PORT_N_CTL_EN_TX_SER;
 662        } else {
 663                /* parallel */
 664                regval = regval | RIO_PORT_N_CTL_EN_RX_PAR
 665                                | RIO_PORT_N_CTL_EN_TX_PAR;
 666        }
 667
 668        if (local) {
 669                rio_local_write_config_32(port, ext_ftr_ptr +
 670                                          RIO_PORT_N_CTL_CSR(0), regval);
 671        } else {
 672                if (rio_mport_write_config_32(port, destid, hopcount,
 673                    ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num), regval) < 0)
 674                        return -EIO;
 675        }
 676#endif
 677        return 0;
 678}
 679EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);
 680
 681
 682/**
 683 * rio_chk_dev_route - Validate route to the specified device.
 684 * @rdev:  RIO device failed to respond
 685 * @nrdev: Last active device on the route to rdev
 686 * @npnum: nrdev's port number on the route to rdev
 687 *
 688 * Follows a route to the specified RIO device to determine the last available
 689 * device (and corresponding RIO port) on the route.
 690 */
 691static int
 692rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)
 693{
 694        u32 result;
 695        int p_port, rc = -EIO;
 696        struct rio_dev *prev = NULL;
 697
 698        /* Find switch with failed RIO link */
 699        while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {
 700                if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {
 701                        prev = rdev->prev;
 702                        break;
 703                }
 704                rdev = rdev->prev;
 705        }
 706
 707        if (prev == NULL)
 708                goto err_out;
 709
 710        p_port = prev->rswitch->route_table[rdev->destid];
 711
 712        if (p_port != RIO_INVALID_ROUTE) {
 713                pr_debug("RIO: link failed on [%s]-P%d\n",
 714                         rio_name(prev), p_port);
 715                *nrdev = prev;
 716                *npnum = p_port;
 717                rc = 0;
 718        } else
 719                pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));
 720err_out:
 721        return rc;
 722}
 723
 724/**
 725 * rio_mport_chk_dev_access - Validate access to the specified device.
 726 * @mport: Master port to send transactions
 727 * @destid: Device destination ID in network
 728 * @hopcount: Number of hops into the network
 729 */
 730int
 731rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)
 732{
 733        int i = 0;
 734        u32 tmp;
 735
 736        while (rio_mport_read_config_32(mport, destid, hopcount,
 737                                        RIO_DEV_ID_CAR, &tmp)) {
 738                i++;
 739                if (i == RIO_MAX_CHK_RETRY)
 740                        return -EIO;
 741                mdelay(1);
 742        }
 743
 744        return 0;
 745}
 746EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);
 747
 748/**
 749 * rio_chk_dev_access - Validate access to the specified device.
 750 * @rdev: Pointer to RIO device control structure
 751 */
 752static int rio_chk_dev_access(struct rio_dev *rdev)
 753{
 754        return rio_mport_chk_dev_access(rdev->net->hport,
 755                                        rdev->destid, rdev->hopcount);
 756}
 757
 758/**
 759 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and
 760 *                        returns link-response (if requested).
 761 * @rdev: RIO devive to issue Input-status command
 762 * @pnum: Device port number to issue the command
 763 * @lnkresp: Response from a link partner
 764 */
 765static int
 766rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)
 767{
 768        u32 regval;
 769        int checkcount;
 770
 771        if (lnkresp) {
 772                /* Read from link maintenance response register
 773                 * to clear valid bit */
 774                rio_read_config_32(rdev,
 775                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 776                        &regval);
 777                udelay(50);
 778        }
 779
 780        /* Issue Input-status command */
 781        rio_write_config_32(rdev,
 782                rdev->phys_efptr + RIO_PORT_N_MNT_REQ_CSR(pnum),
 783                RIO_MNT_REQ_CMD_IS);
 784
 785        /* Exit if the response is not expected */
 786        if (lnkresp == NULL)
 787                return 0;
 788
 789        checkcount = 3;
 790        while (checkcount--) {
 791                udelay(50);
 792                rio_read_config_32(rdev,
 793                        rdev->phys_efptr + RIO_PORT_N_MNT_RSP_CSR(pnum),
 794                        &regval);
 795                if (regval & RIO_PORT_N_MNT_RSP_RVAL) {
 796                        *lnkresp = regval;
 797                        return 0;
 798                }
 799        }
 800
 801        return -EIO;
 802}
 803
 804/**
 805 * rio_clr_err_stopped - Clears port Error-stopped states.
 806 * @rdev: Pointer to RIO device control structure
 807 * @pnum: Switch port number to clear errors
 808 * @err_status: port error status (if 0 reads register from device)
 809 */
 810static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)
 811{
 812        struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];
 813        u32 regval;
 814        u32 far_ackid, far_linkstat, near_ackid;
 815
 816        if (err_status == 0)
 817                rio_read_config_32(rdev,
 818                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 819                        &err_status);
 820
 821        if (err_status & RIO_PORT_N_ERR_STS_PW_OUT_ES) {
 822                pr_debug("RIO_EM: servicing Output Error-Stopped state\n");
 823                /*
 824                 * Send a Link-Request/Input-Status control symbol
 825                 */
 826                if (rio_get_input_status(rdev, pnum, &regval)) {
 827                        pr_debug("RIO_EM: Input-status response timeout\n");
 828                        goto rd_err;
 829                }
 830
 831                pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",
 832                         pnum, regval);
 833                far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;
 834                far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;
 835                rio_read_config_32(rdev,
 836                        rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 837                        &regval);
 838                pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);
 839                near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;
 840                pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \
 841                         " near_ackID=0x%02x\n",
 842                        pnum, far_ackid, far_linkstat, near_ackid);
 843
 844                /*
 845                 * If required, synchronize ackIDs of near and
 846                 * far sides.
 847                 */
 848                if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||
 849                    (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {
 850                        /* Align near outstanding/outbound ackIDs with
 851                         * far inbound.
 852                         */
 853                        rio_write_config_32(rdev,
 854                                rdev->phys_efptr + RIO_PORT_N_ACK_STS_CSR(pnum),
 855                                (near_ackid << 24) |
 856                                        (far_ackid << 8) | far_ackid);
 857                        /* Align far outstanding/outbound ackIDs with
 858                         * near inbound.
 859                         */
 860                        far_ackid++;
 861                        if (nextdev)
 862                                rio_write_config_32(nextdev,
 863                                        nextdev->phys_efptr +
 864                                        RIO_PORT_N_ACK_STS_CSR(RIO_GET_PORT_NUM(nextdev->swpinfo)),
 865                                        (far_ackid << 24) |
 866                                        (near_ackid << 8) | near_ackid);
 867                        else
 868                                pr_debug("RIO_EM: Invalid nextdev pointer (NULL)\n");
 869                }
 870rd_err:
 871                rio_read_config_32(rdev,
 872                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 873                        &err_status);
 874                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 875        }
 876
 877        if ((err_status & RIO_PORT_N_ERR_STS_PW_INP_ES) && nextdev) {
 878                pr_debug("RIO_EM: servicing Input Error-Stopped state\n");
 879                rio_get_input_status(nextdev,
 880                                     RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);
 881                udelay(50);
 882
 883                rio_read_config_32(rdev,
 884                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(pnum),
 885                        &err_status);
 886                pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);
 887        }
 888
 889        return (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 890                              RIO_PORT_N_ERR_STS_PW_INP_ES)) ? 1 : 0;
 891}
 892
 893/**
 894 * rio_inb_pwrite_handler - process inbound port-write message
 895 * @pw_msg: pointer to inbound port-write message
 896 *
 897 * Processes an inbound port-write message. Returns 0 if the request
 898 * has been satisfied.
 899 */
 900int rio_inb_pwrite_handler(union rio_pw_msg *pw_msg)
 901{
 902        struct rio_dev *rdev;
 903        u32 err_status, em_perrdet, em_ltlerrdet;
 904        int rc, portnum;
 905
 906        rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);
 907        if (rdev == NULL) {
 908                /* Device removed or enumeration error */
 909                pr_debug("RIO: %s No matching device for CTag 0x%08x\n",
 910                        __func__, pw_msg->em.comptag);
 911                return -EIO;
 912        }
 913
 914        pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));
 915
 916#ifdef DEBUG_PW
 917        {
 918        u32 i;
 919        for (i = 0; i < RIO_PW_MSG_SIZE/sizeof(u32);) {
 920                        pr_debug("0x%02x: %08x %08x %08x %08x\n",
 921                                 i*4, pw_msg->raw[i], pw_msg->raw[i + 1],
 922                                 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);
 923                        i += 4;
 924        }
 925        }
 926#endif
 927
 928        /* Call an external service function (if such is registered
 929         * for this device). This may be the service for endpoints that send
 930         * device-specific port-write messages. End-point messages expected
 931         * to be handled completely by EP specific device driver.
 932         * For switches rc==0 signals that no standard processing required.
 933         */
 934        if (rdev->pwcback != NULL) {
 935                rc = rdev->pwcback(rdev, pw_msg, 0);
 936                if (rc == 0)
 937                        return 0;
 938        }
 939
 940        portnum = pw_msg->em.is_port & 0xFF;
 941
 942        /* Check if device and route to it are functional:
 943         * Sometimes devices may send PW message(s) just before being
 944         * powered down (or link being lost).
 945         */
 946        if (rio_chk_dev_access(rdev)) {
 947                pr_debug("RIO: device access failed - get link partner\n");
 948                /* Scan route to the device and identify failed link.
 949                 * This will replace device and port reported in PW message.
 950                 * PW message should not be used after this point.
 951                 */
 952                if (rio_chk_dev_route(rdev, &rdev, &portnum)) {
 953                        pr_err("RIO: Route trace for %s failed\n",
 954                                rio_name(rdev));
 955                        return -EIO;
 956                }
 957                pw_msg = NULL;
 958        }
 959
 960        /* For End-point devices processing stops here */
 961        if (!(rdev->pef & RIO_PEF_SWITCH))
 962                return 0;
 963
 964        if (rdev->phys_efptr == 0) {
 965                pr_err("RIO_PW: Bad switch initialization for %s\n",
 966                        rio_name(rdev));
 967                return 0;
 968        }
 969
 970        /*
 971         * Process the port-write notification from switch
 972         */
 973        if (rdev->rswitch->em_handle)
 974                rdev->rswitch->em_handle(rdev, portnum);
 975
 976        rio_read_config_32(rdev,
 977                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
 978                        &err_status);
 979        pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);
 980
 981        if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {
 982
 983                if (!(rdev->rswitch->port_ok & (1 << portnum))) {
 984                        rdev->rswitch->port_ok |= (1 << portnum);
 985                        rio_set_port_lockout(rdev, portnum, 0);
 986                        /* Schedule Insertion Service */
 987                        pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",
 988                               rio_name(rdev), portnum);
 989                }
 990
 991                /* Clear error-stopped states (if reported).
 992                 * Depending on the link partner state, two attempts
 993                 * may be needed for successful recovery.
 994                 */
 995                if (err_status & (RIO_PORT_N_ERR_STS_PW_OUT_ES |
 996                                  RIO_PORT_N_ERR_STS_PW_INP_ES)) {
 997                        if (rio_clr_err_stopped(rdev, portnum, err_status))
 998                                rio_clr_err_stopped(rdev, portnum, 0);
 999                }
1000        }  else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */
1001
1002                if (rdev->rswitch->port_ok & (1 << portnum)) {
1003                        rdev->rswitch->port_ok &= ~(1 << portnum);
1004                        rio_set_port_lockout(rdev, portnum, 1);
1005
1006                        rio_write_config_32(rdev,
1007                                rdev->phys_efptr +
1008                                        RIO_PORT_N_ACK_STS_CSR(portnum),
1009                                RIO_PORT_N_ACK_CLEAR);
1010
1011                        /* Schedule Extraction Service */
1012                        pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",
1013                               rio_name(rdev), portnum);
1014                }
1015        }
1016
1017        rio_read_config_32(rdev,
1018                rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);
1019        if (em_perrdet) {
1020                pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",
1021                         portnum, em_perrdet);
1022                /* Clear EM Port N Error Detect CSR */
1023                rio_write_config_32(rdev,
1024                        rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);
1025        }
1026
1027        rio_read_config_32(rdev,
1028                rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);
1029        if (em_ltlerrdet) {
1030                pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",
1031                         em_ltlerrdet);
1032                /* Clear EM L/T Layer Error Detect CSR */
1033                rio_write_config_32(rdev,
1034                        rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);
1035        }
1036
1037        /* Clear remaining error bits and Port-Write Pending bit */
1038        rio_write_config_32(rdev,
1039                        rdev->phys_efptr + RIO_PORT_N_ERR_STS_CSR(portnum),
1040                        err_status);
1041
1042        return 0;
1043}
1044EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);
1045
1046/**
1047 * rio_mport_get_efb - get pointer to next extended features block
1048 * @port: Master port to issue transaction
1049 * @local: Indicate a local master port or remote device access
1050 * @destid: Destination ID of the device
1051 * @hopcount: Number of switch hops to the device
1052 * @from: Offset of  current Extended Feature block header (if 0 starts
1053 * from ExtFeaturePtr)
1054 */
1055u32
1056rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
1057                      u8 hopcount, u32 from)
1058{
1059        u32 reg_val;
1060
1061        if (from == 0) {
1062                if (local)
1063                        rio_local_read_config_32(port, RIO_ASM_INFO_CAR,
1064                                                 &reg_val);
1065                else
1066                        rio_mport_read_config_32(port, destid, hopcount,
1067                                                 RIO_ASM_INFO_CAR, &reg_val);
1068                return reg_val & RIO_EXT_FTR_PTR_MASK;
1069        } else {
1070                if (local)
1071                        rio_local_read_config_32(port, from, &reg_val);
1072                else
1073                        rio_mport_read_config_32(port, destid, hopcount,
1074                                                 from, &reg_val);
1075                return RIO_GET_BLOCK_ID(reg_val);
1076        }
1077}
1078EXPORT_SYMBOL_GPL(rio_mport_get_efb);
1079
1080/**
1081 * rio_mport_get_feature - query for devices' extended features
1082 * @port: Master port to issue transaction
1083 * @local: Indicate a local master port or remote device access
1084 * @destid: Destination ID of the device
1085 * @hopcount: Number of switch hops to the device
1086 * @ftr: Extended feature code
1087 *
1088 * Tell if a device supports a given RapidIO capability.
1089 * Returns the offset of the requested extended feature
1090 * block within the device's RIO configuration space or
1091 * 0 in case the device does not support it.  Possible
1092 * values for @ftr:
1093 *
1094 * %RIO_EFB_PAR_EP_ID           LP/LVDS EP Devices
1095 *
1096 * %RIO_EFB_PAR_EP_REC_ID       LP/LVDS EP Recovery Devices
1097 *
1098 * %RIO_EFB_PAR_EP_FREE_ID      LP/LVDS EP Free Devices
1099 *
1100 * %RIO_EFB_SER_EP_ID           LP/Serial EP Devices
1101 *
1102 * %RIO_EFB_SER_EP_REC_ID       LP/Serial EP Recovery Devices
1103 *
1104 * %RIO_EFB_SER_EP_FREE_ID      LP/Serial EP Free Devices
1105 */
1106u32
1107rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,
1108                      u8 hopcount, int ftr)
1109{
1110        u32 asm_info, ext_ftr_ptr, ftr_header;
1111
1112        if (local)
1113                rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);
1114        else
1115                rio_mport_read_config_32(port, destid, hopcount,
1116                                         RIO_ASM_INFO_CAR, &asm_info);
1117
1118        ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;
1119
1120        while (ext_ftr_ptr) {
1121                if (local)
1122                        rio_local_read_config_32(port, ext_ftr_ptr,
1123                                                 &ftr_header);
1124                else
1125                        rio_mport_read_config_32(port, destid, hopcount,
1126                                                 ext_ftr_ptr, &ftr_header);
1127                if (RIO_GET_BLOCK_ID(ftr_header) == ftr)
1128                        return ext_ftr_ptr;
1129                if (!(ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header)))
1130                        break;
1131        }
1132
1133        return 0;
1134}
1135EXPORT_SYMBOL_GPL(rio_mport_get_feature);
1136
1137/**
1138 * rio_get_asm - Begin or continue searching for a RIO device by vid/did/asm_vid/asm_did
1139 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1140 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1141 * @asm_vid: RIO asm_vid to match or %RIO_ANY_ID to match all asm_vids
1142 * @asm_did: RIO asm_did to match or %RIO_ANY_ID to match all asm_dids
1143 * @from: Previous RIO device found in search, or %NULL for new search
1144 *
1145 * Iterates through the list of known RIO devices. If a RIO device is
1146 * found with a matching @vid, @did, @asm_vid, @asm_did, the reference
1147 * count to the device is incrememted and a pointer to its device
1148 * structure is returned. Otherwise, %NULL is returned. A new search
1149 * is initiated by passing %NULL to the @from argument. Otherwise, if
1150 * @from is not %NULL, searches continue from next device on the global
1151 * list. The reference count for @from is always decremented if it is
1152 * not %NULL.
1153 */
1154struct rio_dev *rio_get_asm(u16 vid, u16 did,
1155                            u16 asm_vid, u16 asm_did, struct rio_dev *from)
1156{
1157        struct list_head *n;
1158        struct rio_dev *rdev;
1159
1160        WARN_ON(in_interrupt());
1161        spin_lock(&rio_global_list_lock);
1162        n = from ? from->global_list.next : rio_devices.next;
1163
1164        while (n && (n != &rio_devices)) {
1165                rdev = rio_dev_g(n);
1166                if ((vid == RIO_ANY_ID || rdev->vid == vid) &&
1167                    (did == RIO_ANY_ID || rdev->did == did) &&
1168                    (asm_vid == RIO_ANY_ID || rdev->asm_vid == asm_vid) &&
1169                    (asm_did == RIO_ANY_ID || rdev->asm_did == asm_did))
1170                        goto exit;
1171                n = n->next;
1172        }
1173        rdev = NULL;
1174      exit:
1175        rio_dev_put(from);
1176        rdev = rio_dev_get(rdev);
1177        spin_unlock(&rio_global_list_lock);
1178        return rdev;
1179}
1180
1181/**
1182 * rio_get_device - Begin or continue searching for a RIO device by vid/did
1183 * @vid: RIO vid to match or %RIO_ANY_ID to match all vids
1184 * @did: RIO did to match or %RIO_ANY_ID to match all dids
1185 * @from: Previous RIO device found in search, or %NULL for new search
1186 *
1187 * Iterates through the list of known RIO devices. If a RIO device is
1188 * found with a matching @vid and @did, the reference count to the
1189 * device is incrememted and a pointer to its device structure is returned.
1190 * Otherwise, %NULL is returned. A new search is initiated by passing %NULL
1191 * to the @from argument. Otherwise, if @from is not %NULL, searches
1192 * continue from next device on the global list. The reference count for
1193 * @from is always decremented if it is not %NULL.
1194 */
1195struct rio_dev *rio_get_device(u16 vid, u16 did, struct rio_dev *from)
1196{
1197        return rio_get_asm(vid, did, RIO_ANY_ID, RIO_ANY_ID, from);
1198}
1199
1200/**
1201 * rio_std_route_add_entry - Add switch route table entry using standard
1202 *   registers defined in RIO specification rev.1.3
1203 * @mport: Master port to issue transaction
1204 * @destid: Destination ID of the device
1205 * @hopcount: Number of switch hops to the device
1206 * @table: routing table ID (global or port-specific)
1207 * @route_destid: destID entry in the RT
1208 * @route_port: destination port for specified destID
1209 */
1210int rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1211                       u16 table, u16 route_destid, u8 route_port)
1212{
1213        if (table == RIO_GLOBAL_TABLE) {
1214                rio_mport_write_config_32(mport, destid, hopcount,
1215                                RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1216                                (u32)route_destid);
1217                rio_mport_write_config_32(mport, destid, hopcount,
1218                                RIO_STD_RTE_CONF_PORT_SEL_CSR,
1219                                (u32)route_port);
1220        }
1221
1222        udelay(10);
1223        return 0;
1224}
1225
1226/**
1227 * rio_std_route_get_entry - Read switch route table entry (port number)
1228 *   associated with specified destID using standard registers defined in RIO
1229 *   specification rev.1.3
1230 * @mport: Master port to issue transaction
1231 * @destid: Destination ID of the device
1232 * @hopcount: Number of switch hops to the device
1233 * @table: routing table ID (global or port-specific)
1234 * @route_destid: destID entry in the RT
1235 * @route_port: returned destination port for specified destID
1236 */
1237int rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,
1238                       u16 table, u16 route_destid, u8 *route_port)
1239{
1240        u32 result;
1241
1242        if (table == RIO_GLOBAL_TABLE) {
1243                rio_mport_write_config_32(mport, destid, hopcount,
1244                                RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);
1245                rio_mport_read_config_32(mport, destid, hopcount,
1246                                RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);
1247
1248                *route_port = (u8)result;
1249        }
1250
1251        return 0;
1252}
1253
1254/**
1255 * rio_std_route_clr_table - Clear swotch route table using standard registers
1256 *   defined in RIO specification rev.1.3.
1257 * @mport: Master port to issue transaction
1258 * @destid: Destination ID of the device
1259 * @hopcount: Number of switch hops to the device
1260 * @table: routing table ID (global or port-specific)
1261 */
1262int rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,
1263                       u16 table)
1264{
1265        u32 max_destid = 0xff;
1266        u32 i, pef, id_inc = 1, ext_cfg = 0;
1267        u32 port_sel = RIO_INVALID_ROUTE;
1268
1269        if (table == RIO_GLOBAL_TABLE) {
1270                rio_mport_read_config_32(mport, destid, hopcount,
1271                                         RIO_PEF_CAR, &pef);
1272
1273                if (mport->sys_size) {
1274                        rio_mport_read_config_32(mport, destid, hopcount,
1275                                                 RIO_SWITCH_RT_LIMIT,
1276                                                 &max_destid);
1277                        max_destid &= RIO_RT_MAX_DESTID;
1278                }
1279
1280                if (pef & RIO_PEF_EXT_RT) {
1281                        ext_cfg = 0x80000000;
1282                        id_inc = 4;
1283                        port_sel = (RIO_INVALID_ROUTE << 24) |
1284                                   (RIO_INVALID_ROUTE << 16) |
1285                                   (RIO_INVALID_ROUTE << 8) |
1286                                   RIO_INVALID_ROUTE;
1287                }
1288
1289                for (i = 0; i <= max_destid;) {
1290                        rio_mport_write_config_32(mport, destid, hopcount,
1291                                        RIO_STD_RTE_CONF_DESTID_SEL_CSR,
1292                                        ext_cfg | i);
1293                        rio_mport_write_config_32(mport, destid, hopcount,
1294                                        RIO_STD_RTE_CONF_PORT_SEL_CSR,
1295                                        port_sel);
1296                        i += id_inc;
1297                }
1298        }
1299
1300        udelay(10);
1301        return 0;
1302}
1303
1304#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1305
1306static bool rio_chan_filter(struct dma_chan *chan, void *arg)
1307{
1308        struct rio_dev *rdev = arg;
1309
1310        /* Check that DMA device belongs to the right MPORT */
1311        return (rdev->net->hport ==
1312                container_of(chan->device, struct rio_mport, dma));
1313}
1314
1315/**
1316 * rio_request_dma - request RapidIO capable DMA channel that supports
1317 *   specified target RapidIO device.
1318 * @rdev: RIO device control structure
1319 *
1320 * Returns pointer to allocated DMA channel or NULL if failed.
1321 */
1322struct dma_chan *rio_request_dma(struct rio_dev *rdev)
1323{
1324        dma_cap_mask_t mask;
1325        struct dma_chan *dchan;
1326
1327        dma_cap_zero(mask);
1328        dma_cap_set(DMA_SLAVE, mask);
1329        dchan = dma_request_channel(mask, rio_chan_filter, rdev);
1330
1331        return dchan;
1332}
1333EXPORT_SYMBOL_GPL(rio_request_dma);
1334
1335/**
1336 * rio_release_dma - release specified DMA channel
1337 * @dchan: DMA channel to release
1338 */
1339void rio_release_dma(struct dma_chan *dchan)
1340{
1341        dma_release_channel(dchan);
1342}
1343EXPORT_SYMBOL_GPL(rio_release_dma);
1344
1345/**
1346 * rio_dma_prep_slave_sg - RapidIO specific wrapper
1347 *   for device_prep_slave_sg callback defined by DMAENGINE.
1348 * @rdev: RIO device control structure
1349 * @dchan: DMA channel to configure
1350 * @data: RIO specific data descriptor
1351 * @direction: DMA data transfer direction (TO or FROM the device)
1352 * @flags: dmaengine defined flags
1353 *
1354 * Initializes RapidIO capable DMA channel for the specified data transfer.
1355 * Uses DMA channel private extension to pass information related to remote
1356 * target RIO device.
1357 * Returns pointer to DMA transaction descriptor or NULL if failed.
1358 */
1359struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,
1360        struct dma_chan *dchan, struct rio_dma_data *data,
1361        enum dma_transfer_direction direction, unsigned long flags)
1362{
1363        struct dma_async_tx_descriptor *txd = NULL;
1364        struct rio_dma_ext rio_ext;
1365
1366        if (dchan->device->device_prep_slave_sg == NULL) {
1367                pr_err("%s: prep_rio_sg == NULL\n", __func__);
1368                return NULL;
1369        }
1370
1371        rio_ext.destid = rdev->destid;
1372        rio_ext.rio_addr_u = data->rio_addr_u;
1373        rio_ext.rio_addr = data->rio_addr;
1374        rio_ext.wr_type = data->wr_type;
1375
1376        txd = dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,
1377                                        direction, flags, &rio_ext);
1378
1379        return txd;
1380}
1381EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);
1382
1383#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1384
1385/**
1386 * rio_find_mport - find RIO mport by its ID
1387 * @mport_id: number (ID) of mport device
1388 *
1389 * Given a RIO mport number, the desired mport is located
1390 * in the global list of mports. If the mport is found, a pointer to its
1391 * data structure is returned.  If no mport is found, %NULL is returned.
1392 */
1393struct rio_mport *rio_find_mport(int mport_id)
1394{
1395        struct rio_mport *port;
1396
1397        mutex_lock(&rio_mport_list_lock);
1398        list_for_each_entry(port, &rio_mports, node) {
1399                if (port->id == mport_id)
1400                        goto found;
1401        }
1402        port = NULL;
1403found:
1404        mutex_unlock(&rio_mport_list_lock);
1405
1406        return port;
1407}
1408
1409/**
1410 * rio_register_scan - enumeration/discovery method registration interface
1411 * @mport_id: mport device ID for which fabric scan routine has to be set
1412 *            (RIO_MPORT_ANY = set for all available mports)
1413 * @scan_ops: enumeration/discovery control structure
1414 *
1415 * Assigns enumeration or discovery method to the specified mport device (or all
1416 * available mports if RIO_MPORT_ANY is specified).
1417 * Returns error if the mport already has an enumerator attached to it.
1418 * In case of RIO_MPORT_ANY ignores ports with valid scan routines and returns
1419 * an error if was unable to find at least one available mport.
1420 */
1421int rio_register_scan(int mport_id, struct rio_scan *scan_ops)
1422{
1423        struct rio_mport *port;
1424        int rc = -EBUSY;
1425
1426        mutex_lock(&rio_mport_list_lock);
1427        list_for_each_entry(port, &rio_mports, node) {
1428                if (port->id == mport_id || mport_id == RIO_MPORT_ANY) {
1429                        if (port->nscan && mport_id == RIO_MPORT_ANY)
1430                                continue;
1431                        else if (port->nscan)
1432                                break;
1433
1434                        port->nscan = scan_ops;
1435                        rc = 0;
1436
1437                        if (mport_id != RIO_MPORT_ANY)
1438                                break;
1439                }
1440        }
1441        mutex_unlock(&rio_mport_list_lock);
1442
1443        return rc;
1444}
1445EXPORT_SYMBOL_GPL(rio_register_scan);
1446
1447/**
1448 * rio_unregister_scan - removes enumeration/discovery method from mport
1449 * @mport_id: mport device ID for which fabric scan routine has to be
1450 *            unregistered (RIO_MPORT_ANY = set for all available mports)
1451 *
1452 * Removes enumeration or discovery method assigned to the specified mport
1453 * device (or all available mports if RIO_MPORT_ANY is specified).
1454 */
1455int rio_unregister_scan(int mport_id)
1456{
1457        struct rio_mport *port;
1458
1459        mutex_lock(&rio_mport_list_lock);
1460        list_for_each_entry(port, &rio_mports, node) {
1461                if (port->id == mport_id || mport_id == RIO_MPORT_ANY) {
1462                        if (port->nscan)
1463                                port->nscan = NULL;
1464                        if (mport_id != RIO_MPORT_ANY)
1465                                break;
1466                }
1467        }
1468        mutex_unlock(&rio_mport_list_lock);
1469
1470        return 0;
1471}
1472EXPORT_SYMBOL_GPL(rio_unregister_scan);
1473
1474static void rio_fixup_device(struct rio_dev *dev)
1475{
1476}
1477
1478static int rio_init(void)
1479{
1480        struct rio_dev *dev = NULL;
1481
1482        while ((dev = rio_get_device(RIO_ANY_ID, RIO_ANY_ID, dev)) != NULL) {
1483                rio_fixup_device(dev);
1484        }
1485        return 0;
1486}
1487
1488static struct workqueue_struct *rio_wq;
1489
1490struct rio_disc_work {
1491        struct work_struct      work;
1492        struct rio_mport        *mport;
1493};
1494
1495static void disc_work_handler(struct work_struct *_work)
1496{
1497        struct rio_disc_work *work;
1498
1499        work = container_of(_work, struct rio_disc_work, work);
1500        pr_debug("RIO: discovery work for mport %d %s\n",
1501                 work->mport->id, work->mport->name);
1502        work->mport->nscan->discover(work->mport, 0);
1503}
1504
1505int rio_init_mports(void)
1506{
1507        struct rio_mport *port;
1508        struct rio_disc_work *work;
1509        int n = 0;
1510
1511        if (!next_portid)
1512                return -ENODEV;
1513
1514        /*
1515         * First, run enumerations and check if we need to perform discovery
1516         * on any of the registered mports.
1517         */
1518        mutex_lock(&rio_mport_list_lock);
1519        list_for_each_entry(port, &rio_mports, node) {
1520                if (port->host_deviceid >= 0) {
1521                        if (port->nscan)
1522                                port->nscan->enumerate(port, 0);
1523                } else
1524                        n++;
1525        }
1526        mutex_unlock(&rio_mport_list_lock);
1527
1528        if (!n)
1529                goto no_disc;
1530
1531        /*
1532         * If we have mports that require discovery schedule a discovery work
1533         * for each of them. If the code below fails to allocate needed
1534         * resources, exit without error to keep results of enumeration
1535         * process (if any).
1536         * TODO: Implement restart of dicovery process for all or
1537         * individual discovering mports.
1538         */
1539        rio_wq = alloc_workqueue("riodisc", 0, 0);
1540        if (!rio_wq) {
1541                pr_err("RIO: unable allocate rio_wq\n");
1542                goto no_disc;
1543        }
1544
1545        work = kcalloc(n, sizeof *work, GFP_KERNEL);
1546        if (!work) {
1547                pr_err("RIO: no memory for work struct\n");
1548                destroy_workqueue(rio_wq);
1549                goto no_disc;
1550        }
1551
1552        n = 0;
1553        mutex_lock(&rio_mport_list_lock);
1554        list_for_each_entry(port, &rio_mports, node) {
1555                if (port->host_deviceid < 0 && port->nscan) {
1556                        work[n].mport = port;
1557                        INIT_WORK(&work[n].work, disc_work_handler);
1558                        queue_work(rio_wq, &work[n].work);
1559                        n++;
1560                }
1561        }
1562        mutex_unlock(&rio_mport_list_lock);
1563
1564        flush_workqueue(rio_wq);
1565        pr_debug("RIO: destroy discovery workqueue\n");
1566        destroy_workqueue(rio_wq);
1567        kfree(work);
1568
1569no_disc:
1570        rio_init();
1571
1572        return 0;
1573}
1574
1575static int hdids[RIO_MAX_MPORTS + 1];
1576
1577static int rio_get_hdid(int index)
1578{
1579        if (!hdids[0] || hdids[0] <= index || index >= RIO_MAX_MPORTS)
1580                return -1;
1581
1582        return hdids[index + 1];
1583}
1584
1585static int rio_hdid_setup(char *str)
1586{
1587        (void)get_options(str, ARRAY_SIZE(hdids), hdids);
1588        return 1;
1589}
1590
1591__setup("riohdid=", rio_hdid_setup);
1592
1593int rio_register_mport(struct rio_mport *port)
1594{
1595        if (next_portid >= RIO_MAX_MPORTS) {
1596                pr_err("RIO: reached specified max number of mports\n");
1597                return 1;
1598        }
1599
1600        port->id = next_portid++;
1601        port->host_deviceid = rio_get_hdid(port->id);
1602        port->nscan = NULL;
1603        mutex_lock(&rio_mport_list_lock);
1604        list_add_tail(&port->node, &rio_mports);
1605        mutex_unlock(&rio_mport_list_lock);
1606        return 0;
1607}
1608
1609EXPORT_SYMBOL_GPL(rio_local_get_device_id);
1610EXPORT_SYMBOL_GPL(rio_get_device);
1611EXPORT_SYMBOL_GPL(rio_get_asm);
1612EXPORT_SYMBOL_GPL(rio_request_inb_dbell);
1613EXPORT_SYMBOL_GPL(rio_release_inb_dbell);
1614EXPORT_SYMBOL_GPL(rio_request_outb_dbell);
1615EXPORT_SYMBOL_GPL(rio_release_outb_dbell);
1616EXPORT_SYMBOL_GPL(rio_request_inb_mbox);
1617EXPORT_SYMBOL_GPL(rio_release_inb_mbox);
1618EXPORT_SYMBOL_GPL(rio_request_outb_mbox);
1619EXPORT_SYMBOL_GPL(rio_release_outb_mbox);
1620EXPORT_SYMBOL_GPL(rio_init_mports);
1621
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