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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * RapidIO interconnect services4 * (RapidIO Interconnect Specification, http://www.rapidio.org)5 *6 * Copyright 2005 MontaVista Software, Inc.7 * Matt Porter <mporter@kernel.crashing.org>8 *9 * Copyright 2009 - 2013 Integrated Device Technology, Inc.10 * Alex Bounine <alexandre.bounine@idt.com>11 */12 13#include <linux/types.h>14#include <linux/kernel.h>15 16#include <linux/delay.h>17#include <linux/init.h>18#include <linux/rio.h>19#include <linux/rio_drv.h>20#include <linux/rio_ids.h>21#include <linux/rio_regs.h>22#include <linux/module.h>23#include <linux/spinlock.h>24#include <linux/slab.h>25#include <linux/interrupt.h>26 27#include "rio.h"28 29/*30 * struct rio_pwrite - RIO portwrite event31 * @node: Node in list of doorbell events32 * @pwcback: Doorbell event callback33 * @context: Handler specific context to pass on event34 */35struct rio_pwrite {36 struct list_head node;37 38 int (*pwcback)(struct rio_mport *mport, void *context,39 union rio_pw_msg *msg, int step);40 void *context;41};42 43MODULE_DESCRIPTION("RapidIO Subsystem Core");44MODULE_AUTHOR("Matt Porter <mporter@kernel.crashing.org>");45MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");46MODULE_LICENSE("GPL");47 48static int hdid[RIO_MAX_MPORTS];49static int ids_num;50module_param_array(hdid, int, &ids_num, 0);51MODULE_PARM_DESC(hdid,52 "Destination ID assignment to local RapidIO controllers");53 54static LIST_HEAD(rio_devices);55static LIST_HEAD(rio_nets);56static DEFINE_SPINLOCK(rio_global_list_lock);57 58static LIST_HEAD(rio_mports);59static LIST_HEAD(rio_scans);60static DEFINE_MUTEX(rio_mport_list_lock);61static unsigned char next_portid;62static DEFINE_SPINLOCK(rio_mmap_lock);63 64/**65 * rio_local_get_device_id - Get the base/extended device id for a port66 * @port: RIO master port from which to get the deviceid67 *68 * Reads the base/extended device id from the local device69 * implementing the master port. Returns the 8/16-bit device70 * id.71 */72u16 rio_local_get_device_id(struct rio_mport *port)73{74 u32 result;75 76 rio_local_read_config_32(port, RIO_DID_CSR, &result);77 78 return (RIO_GET_DID(port->sys_size, result));79}80EXPORT_SYMBOL_GPL(rio_local_get_device_id);81 82/**83 * rio_query_mport - Query mport device attributes84 * @port: mport device to query85 * @mport_attr: mport attributes data structure86 *87 * Returns attributes of specified mport through the88 * pointer to attributes data structure.89 */90int rio_query_mport(struct rio_mport *port,91 struct rio_mport_attr *mport_attr)92{93 if (!port->ops->query_mport)94 return -ENODATA;95 return port->ops->query_mport(port, mport_attr);96}97EXPORT_SYMBOL(rio_query_mport);98 99/**100 * rio_alloc_net- Allocate and initialize a new RIO network data structure101 * @mport: Master port associated with the RIO network102 *103 * Allocates a RIO network structure, initializes per-network104 * list heads, and adds the associated master port to the105 * network list of associated master ports. Returns a106 * RIO network pointer on success or %NULL on failure.107 */108struct rio_net *rio_alloc_net(struct rio_mport *mport)109{110 struct rio_net *net = kzalloc(sizeof(*net), GFP_KERNEL);111 112 if (net) {113 INIT_LIST_HEAD(&net->node);114 INIT_LIST_HEAD(&net->devices);115 INIT_LIST_HEAD(&net->switches);116 INIT_LIST_HEAD(&net->mports);117 mport->net = net;118 }119 return net;120}121EXPORT_SYMBOL_GPL(rio_alloc_net);122 123int rio_add_net(struct rio_net *net)124{125 int err;126 127 err = device_register(&net->dev);128 if (err)129 return err;130 spin_lock(&rio_global_list_lock);131 list_add_tail(&net->node, &rio_nets);132 spin_unlock(&rio_global_list_lock);133 134 return 0;135}136EXPORT_SYMBOL_GPL(rio_add_net);137 138void rio_free_net(struct rio_net *net)139{140 spin_lock(&rio_global_list_lock);141 if (!list_empty(&net->node))142 list_del(&net->node);143 spin_unlock(&rio_global_list_lock);144 if (net->release)145 net->release(net);146 device_unregister(&net->dev);147}148EXPORT_SYMBOL_GPL(rio_free_net);149 150/**151 * rio_local_set_device_id - Set the base/extended device id for a port152 * @port: RIO master port153 * @did: Device ID value to be written154 *155 * Writes the base/extended device id from a device.156 */157void rio_local_set_device_id(struct rio_mport *port, u16 did)158{159 rio_local_write_config_32(port, RIO_DID_CSR,160 RIO_SET_DID(port->sys_size, did));161}162EXPORT_SYMBOL_GPL(rio_local_set_device_id);163 164/**165 * rio_add_device- Adds a RIO device to the device model166 * @rdev: RIO device167 *168 * Adds the RIO device to the global device list and adds the RIO169 * device to the RIO device list. Creates the generic sysfs nodes170 * for an RIO device.171 */172int rio_add_device(struct rio_dev *rdev)173{174 int err;175 176 atomic_set(&rdev->state, RIO_DEVICE_RUNNING);177 err = device_register(&rdev->dev);178 if (err)179 return err;180 181 spin_lock(&rio_global_list_lock);182 list_add_tail(&rdev->global_list, &rio_devices);183 if (rdev->net) {184 list_add_tail(&rdev->net_list, &rdev->net->devices);185 if (rdev->pef & RIO_PEF_SWITCH)186 list_add_tail(&rdev->rswitch->node,187 &rdev->net->switches);188 }189 spin_unlock(&rio_global_list_lock);190 191 return 0;192}193EXPORT_SYMBOL_GPL(rio_add_device);194 195/*196 * rio_del_device - removes a RIO device from the device model197 * @rdev: RIO device198 * @state: device state to set during removal process199 *200 * Removes the RIO device to the kernel device list and subsystem's device list.201 * Clears sysfs entries for the removed device.202 */203void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)204{205 pr_debug("RIO: %s: removing %s\n", __func__, rio_name(rdev));206 atomic_set(&rdev->state, state);207 spin_lock(&rio_global_list_lock);208 list_del(&rdev->global_list);209 if (rdev->net) {210 list_del(&rdev->net_list);211 if (rdev->pef & RIO_PEF_SWITCH) {212 list_del(&rdev->rswitch->node);213 kfree(rdev->rswitch->route_table);214 }215 }216 spin_unlock(&rio_global_list_lock);217 device_unregister(&rdev->dev);218}219EXPORT_SYMBOL_GPL(rio_del_device);220 221/**222 * rio_request_inb_mbox - request inbound mailbox service223 * @mport: RIO master port from which to allocate the mailbox resource224 * @dev_id: Device specific pointer to pass on event225 * @mbox: Mailbox number to claim226 * @entries: Number of entries in inbound mailbox queue227 * @minb: Callback to execute when inbound message is received228 *229 * Requests ownership of an inbound mailbox resource and binds230 * a callback function to the resource. Returns %0 on success.231 */232int rio_request_inb_mbox(struct rio_mport *mport,233 void *dev_id,234 int mbox,235 int entries,236 void (*minb) (struct rio_mport * mport, void *dev_id, int mbox,237 int slot))238{239 int rc = -ENOSYS;240 struct resource *res;241 242 if (!mport->ops->open_inb_mbox)243 goto out;244 245 res = kzalloc(sizeof(*res), GFP_KERNEL);246 if (res) {247 rio_init_mbox_res(res, mbox, mbox);248 249 /* Make sure this mailbox isn't in use */250 rc = request_resource(&mport->riores[RIO_INB_MBOX_RESOURCE],251 res);252 if (rc < 0) {253 kfree(res);254 goto out;255 }256 257 mport->inb_msg[mbox].res = res;258 259 /* Hook the inbound message callback */260 mport->inb_msg[mbox].mcback = minb;261 262 rc = mport->ops->open_inb_mbox(mport, dev_id, mbox, entries);263 if (rc) {264 mport->inb_msg[mbox].mcback = NULL;265 mport->inb_msg[mbox].res = NULL;266 release_resource(res);267 kfree(res);268 }269 } else270 rc = -ENOMEM;271 272 out:273 return rc;274}275EXPORT_SYMBOL_GPL(rio_request_inb_mbox);276 277/**278 * rio_release_inb_mbox - release inbound mailbox message service279 * @mport: RIO master port from which to release the mailbox resource280 * @mbox: Mailbox number to release281 *282 * Releases ownership of an inbound mailbox resource. Returns 0283 * if the request has been satisfied.284 */285int rio_release_inb_mbox(struct rio_mport *mport, int mbox)286{287 int rc;288 289 if (!mport->ops->close_inb_mbox || !mport->inb_msg[mbox].res)290 return -EINVAL;291 292 mport->ops->close_inb_mbox(mport, mbox);293 mport->inb_msg[mbox].mcback = NULL;294 295 rc = release_resource(mport->inb_msg[mbox].res);296 if (rc)297 return rc;298 299 kfree(mport->inb_msg[mbox].res);300 mport->inb_msg[mbox].res = NULL;301 302 return 0;303}304EXPORT_SYMBOL_GPL(rio_release_inb_mbox);305 306/**307 * rio_request_outb_mbox - request outbound mailbox service308 * @mport: RIO master port from which to allocate the mailbox resource309 * @dev_id: Device specific pointer to pass on event310 * @mbox: Mailbox number to claim311 * @entries: Number of entries in outbound mailbox queue312 * @moutb: Callback to execute when outbound message is sent313 *314 * Requests ownership of an outbound mailbox resource and binds315 * a callback function to the resource. Returns 0 on success.316 */317int rio_request_outb_mbox(struct rio_mport *mport,318 void *dev_id,319 int mbox,320 int entries,321 void (*moutb) (struct rio_mport * mport, void *dev_id, int mbox, int slot))322{323 int rc = -ENOSYS;324 struct resource *res;325 326 if (!mport->ops->open_outb_mbox)327 goto out;328 329 res = kzalloc(sizeof(*res), GFP_KERNEL);330 if (res) {331 rio_init_mbox_res(res, mbox, mbox);332 333 /* Make sure this outbound mailbox isn't in use */334 rc = request_resource(&mport->riores[RIO_OUTB_MBOX_RESOURCE],335 res);336 if (rc < 0) {337 kfree(res);338 goto out;339 }340 341 mport->outb_msg[mbox].res = res;342 343 /* Hook the inbound message callback */344 mport->outb_msg[mbox].mcback = moutb;345 346 rc = mport->ops->open_outb_mbox(mport, dev_id, mbox, entries);347 if (rc) {348 mport->outb_msg[mbox].mcback = NULL;349 mport->outb_msg[mbox].res = NULL;350 release_resource(res);351 kfree(res);352 }353 } else354 rc = -ENOMEM;355 356 out:357 return rc;358}359EXPORT_SYMBOL_GPL(rio_request_outb_mbox);360 361/**362 * rio_release_outb_mbox - release outbound mailbox message service363 * @mport: RIO master port from which to release the mailbox resource364 * @mbox: Mailbox number to release365 *366 * Releases ownership of an inbound mailbox resource. Returns 0367 * if the request has been satisfied.368 */369int rio_release_outb_mbox(struct rio_mport *mport, int mbox)370{371 int rc;372 373 if (!mport->ops->close_outb_mbox || !mport->outb_msg[mbox].res)374 return -EINVAL;375 376 mport->ops->close_outb_mbox(mport, mbox);377 mport->outb_msg[mbox].mcback = NULL;378 379 rc = release_resource(mport->outb_msg[mbox].res);380 if (rc)381 return rc;382 383 kfree(mport->outb_msg[mbox].res);384 mport->outb_msg[mbox].res = NULL;385 386 return 0;387}388EXPORT_SYMBOL_GPL(rio_release_outb_mbox);389 390/**391 * rio_setup_inb_dbell - bind inbound doorbell callback392 * @mport: RIO master port to bind the doorbell callback393 * @dev_id: Device specific pointer to pass on event394 * @res: Doorbell message resource395 * @dinb: Callback to execute when doorbell is received396 *397 * Adds a doorbell resource/callback pair into a port's398 * doorbell event list. Returns 0 if the request has been399 * satisfied.400 */401static int402rio_setup_inb_dbell(struct rio_mport *mport, void *dev_id, struct resource *res,403 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src, u16 dst,404 u16 info))405{406 struct rio_dbell *dbell = kmalloc(sizeof(*dbell), GFP_KERNEL);407 408 if (!dbell)409 return -ENOMEM;410 411 dbell->res = res;412 dbell->dinb = dinb;413 dbell->dev_id = dev_id;414 415 mutex_lock(&mport->lock);416 list_add_tail(&dbell->node, &mport->dbells);417 mutex_unlock(&mport->lock);418 return 0;419}420 421/**422 * rio_request_inb_dbell - request inbound doorbell message service423 * @mport: RIO master port from which to allocate the doorbell resource424 * @dev_id: Device specific pointer to pass on event425 * @start: Doorbell info range start426 * @end: Doorbell info range end427 * @dinb: Callback to execute when doorbell is received428 *429 * Requests ownership of an inbound doorbell resource and binds430 * a callback function to the resource. Returns 0 if the request431 * has been satisfied.432 */433int rio_request_inb_dbell(struct rio_mport *mport,434 void *dev_id,435 u16 start,436 u16 end,437 void (*dinb) (struct rio_mport * mport, void *dev_id, u16 src,438 u16 dst, u16 info))439{440 int rc;441 struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);442 443 if (res) {444 rio_init_dbell_res(res, start, end);445 446 /* Make sure these doorbells aren't in use */447 rc = request_resource(&mport->riores[RIO_DOORBELL_RESOURCE],448 res);449 if (rc < 0) {450 kfree(res);451 goto out;452 }453 454 /* Hook the doorbell callback */455 rc = rio_setup_inb_dbell(mport, dev_id, res, dinb);456 } else457 rc = -ENOMEM;458 459 out:460 return rc;461}462EXPORT_SYMBOL_GPL(rio_request_inb_dbell);463 464/**465 * rio_release_inb_dbell - release inbound doorbell message service466 * @mport: RIO master port from which to release the doorbell resource467 * @start: Doorbell info range start468 * @end: Doorbell info range end469 *470 * Releases ownership of an inbound doorbell resource and removes471 * callback from the doorbell event list. Returns 0 if the request472 * has been satisfied.473 */474int rio_release_inb_dbell(struct rio_mport *mport, u16 start, u16 end)475{476 int rc = 0, found = 0;477 struct rio_dbell *dbell;478 479 mutex_lock(&mport->lock);480 list_for_each_entry(dbell, &mport->dbells, node) {481 if ((dbell->res->start == start) && (dbell->res->end == end)) {482 list_del(&dbell->node);483 found = 1;484 break;485 }486 }487 mutex_unlock(&mport->lock);488 489 /* If we can't find an exact match, fail */490 if (!found) {491 rc = -EINVAL;492 goto out;493 }494 495 /* Release the doorbell resource */496 rc = release_resource(dbell->res);497 498 /* Free the doorbell event */499 kfree(dbell);500 501 out:502 return rc;503}504EXPORT_SYMBOL_GPL(rio_release_inb_dbell);505 506/**507 * rio_request_outb_dbell - request outbound doorbell message range508 * @rdev: RIO device from which to allocate the doorbell resource509 * @start: Doorbell message range start510 * @end: Doorbell message range end511 *512 * Requests ownership of a doorbell message range. Returns a resource513 * if the request has been satisfied or %NULL on failure.514 */515struct resource *rio_request_outb_dbell(struct rio_dev *rdev, u16 start,516 u16 end)517{518 struct resource *res = kzalloc(sizeof(struct resource), GFP_KERNEL);519 520 if (res) {521 rio_init_dbell_res(res, start, end);522 523 /* Make sure these doorbells aren't in use */524 if (request_resource(&rdev->riores[RIO_DOORBELL_RESOURCE], res)525 < 0) {526 kfree(res);527 res = NULL;528 }529 }530 531 return res;532}533EXPORT_SYMBOL_GPL(rio_request_outb_dbell);534 535/**536 * rio_release_outb_dbell - release outbound doorbell message range537 * @rdev: RIO device from which to release the doorbell resource538 * @res: Doorbell resource to be freed539 *540 * Releases ownership of a doorbell message range. Returns 0 if the541 * request has been satisfied.542 */543int rio_release_outb_dbell(struct rio_dev *rdev, struct resource *res)544{545 int rc = release_resource(res);546 547 kfree(res);548 549 return rc;550}551EXPORT_SYMBOL_GPL(rio_release_outb_dbell);552 553/**554 * rio_add_mport_pw_handler - add port-write message handler into the list555 * of mport specific pw handlers556 * @mport: RIO master port to bind the portwrite callback557 * @context: Handler specific context to pass on event558 * @pwcback: Callback to execute when portwrite is received559 *560 * Returns 0 if the request has been satisfied.561 */562int rio_add_mport_pw_handler(struct rio_mport *mport, void *context,563 int (*pwcback)(struct rio_mport *mport,564 void *context, union rio_pw_msg *msg, int step))565{566 struct rio_pwrite *pwrite = kzalloc(sizeof(*pwrite), GFP_KERNEL);567 568 if (!pwrite)569 return -ENOMEM;570 571 pwrite->pwcback = pwcback;572 pwrite->context = context;573 mutex_lock(&mport->lock);574 list_add_tail(&pwrite->node, &mport->pwrites);575 mutex_unlock(&mport->lock);576 return 0;577}578EXPORT_SYMBOL_GPL(rio_add_mport_pw_handler);579 580/**581 * rio_del_mport_pw_handler - remove port-write message handler from the list582 * of mport specific pw handlers583 * @mport: RIO master port to bind the portwrite callback584 * @context: Registered handler specific context to pass on event585 * @pwcback: Registered callback function586 *587 * Returns 0 if the request has been satisfied.588 */589int rio_del_mport_pw_handler(struct rio_mport *mport, void *context,590 int (*pwcback)(struct rio_mport *mport,591 void *context, union rio_pw_msg *msg, int step))592{593 int rc = -EINVAL;594 struct rio_pwrite *pwrite;595 596 mutex_lock(&mport->lock);597 list_for_each_entry(pwrite, &mport->pwrites, node) {598 if (pwrite->pwcback == pwcback && pwrite->context == context) {599 list_del(&pwrite->node);600 kfree(pwrite);601 rc = 0;602 break;603 }604 }605 mutex_unlock(&mport->lock);606 607 return rc;608}609EXPORT_SYMBOL_GPL(rio_del_mport_pw_handler);610 611/**612 * rio_request_inb_pwrite - request inbound port-write message service for613 * specific RapidIO device614 * @rdev: RIO device to which register inbound port-write callback routine615 * @pwcback: Callback routine to execute when port-write is received616 *617 * Binds a port-write callback function to the RapidIO device.618 * Returns 0 if the request has been satisfied.619 */620int rio_request_inb_pwrite(struct rio_dev *rdev,621 int (*pwcback)(struct rio_dev *rdev, union rio_pw_msg *msg, int step))622{623 int rc = 0;624 625 spin_lock(&rio_global_list_lock);626 if (rdev->pwcback)627 rc = -ENOMEM;628 else629 rdev->pwcback = pwcback;630 631 spin_unlock(&rio_global_list_lock);632 return rc;633}634EXPORT_SYMBOL_GPL(rio_request_inb_pwrite);635 636/**637 * rio_release_inb_pwrite - release inbound port-write message service638 * associated with specific RapidIO device639 * @rdev: RIO device which registered for inbound port-write callback640 *641 * Removes callback from the rio_dev structure. Returns 0 if the request642 * has been satisfied.643 */644int rio_release_inb_pwrite(struct rio_dev *rdev)645{646 int rc = -ENOMEM;647 648 spin_lock(&rio_global_list_lock);649 if (rdev->pwcback) {650 rdev->pwcback = NULL;651 rc = 0;652 }653 654 spin_unlock(&rio_global_list_lock);655 return rc;656}657EXPORT_SYMBOL_GPL(rio_release_inb_pwrite);658 659/**660 * rio_pw_enable - Enables/disables port-write handling by a master port661 * @mport: Master port associated with port-write handling662 * @enable: 1=enable, 0=disable663 */664void rio_pw_enable(struct rio_mport *mport, int enable)665{666 if (mport->ops->pwenable) {667 mutex_lock(&mport->lock);668 669 if ((enable && ++mport->pwe_refcnt == 1) ||670 (!enable && mport->pwe_refcnt && --mport->pwe_refcnt == 0))671 mport->ops->pwenable(mport, enable);672 mutex_unlock(&mport->lock);673 }674}675EXPORT_SYMBOL_GPL(rio_pw_enable);676 677/**678 * rio_map_inb_region -- Map inbound memory region.679 * @mport: Master port.680 * @local: physical address of memory region to be mapped681 * @rbase: RIO base address assigned to this window682 * @size: Size of the memory region683 * @rflags: Flags for mapping.684 *685 * Return: 0 -- Success.686 *687 * This function will create the mapping from RIO space to local memory.688 */689int rio_map_inb_region(struct rio_mport *mport, dma_addr_t local,690 u64 rbase, u32 size, u32 rflags)691{692 int rc;693 unsigned long flags;694 695 if (!mport->ops->map_inb)696 return -1;697 spin_lock_irqsave(&rio_mmap_lock, flags);698 rc = mport->ops->map_inb(mport, local, rbase, size, rflags);699 spin_unlock_irqrestore(&rio_mmap_lock, flags);700 return rc;701}702EXPORT_SYMBOL_GPL(rio_map_inb_region);703 704/**705 * rio_unmap_inb_region -- Unmap the inbound memory region706 * @mport: Master port707 * @lstart: physical address of memory region to be unmapped708 */709void rio_unmap_inb_region(struct rio_mport *mport, dma_addr_t lstart)710{711 unsigned long flags;712 if (!mport->ops->unmap_inb)713 return;714 spin_lock_irqsave(&rio_mmap_lock, flags);715 mport->ops->unmap_inb(mport, lstart);716 spin_unlock_irqrestore(&rio_mmap_lock, flags);717}718EXPORT_SYMBOL_GPL(rio_unmap_inb_region);719 720/**721 * rio_map_outb_region -- Map outbound memory region.722 * @mport: Master port.723 * @destid: destination id window points to724 * @rbase: RIO base address window translates to725 * @size: Size of the memory region726 * @rflags: Flags for mapping.727 * @local: physical address of memory region mapped728 *729 * Return: 0 -- Success.730 *731 * This function will create the mapping from RIO space to local memory.732 */733int rio_map_outb_region(struct rio_mport *mport, u16 destid, u64 rbase,734 u32 size, u32 rflags, dma_addr_t *local)735{736 int rc;737 unsigned long flags;738 739 if (!mport->ops->map_outb)740 return -ENODEV;741 742 spin_lock_irqsave(&rio_mmap_lock, flags);743 rc = mport->ops->map_outb(mport, destid, rbase, size,744 rflags, local);745 spin_unlock_irqrestore(&rio_mmap_lock, flags);746 747 return rc;748}749EXPORT_SYMBOL_GPL(rio_map_outb_region);750 751/**752 * rio_unmap_outb_region -- Unmap the inbound memory region753 * @mport: Master port754 * @destid: destination id mapping points to755 * @rstart: RIO base address window translates to756 */757void rio_unmap_outb_region(struct rio_mport *mport, u16 destid, u64 rstart)758{759 unsigned long flags;760 761 if (!mport->ops->unmap_outb)762 return;763 764 spin_lock_irqsave(&rio_mmap_lock, flags);765 mport->ops->unmap_outb(mport, destid, rstart);766 spin_unlock_irqrestore(&rio_mmap_lock, flags);767}768EXPORT_SYMBOL_GPL(rio_unmap_outb_region);769 770/**771 * rio_mport_get_physefb - Helper function that returns register offset772 * for Physical Layer Extended Features Block.773 * @port: Master port to issue transaction774 * @local: Indicate a local master port or remote device access775 * @destid: Destination ID of the device776 * @hopcount: Number of switch hops to the device777 * @rmap: pointer to location to store register map type info778 */779u32780rio_mport_get_physefb(struct rio_mport *port, int local,781 u16 destid, u8 hopcount, u32 *rmap)782{783 u32 ext_ftr_ptr;784 u32 ftr_header;785 786 ext_ftr_ptr = rio_mport_get_efb(port, local, destid, hopcount, 0);787 788 while (ext_ftr_ptr) {789 if (local)790 rio_local_read_config_32(port, ext_ftr_ptr,791 &ftr_header);792 else793 rio_mport_read_config_32(port, destid, hopcount,794 ext_ftr_ptr, &ftr_header);795 796 ftr_header = RIO_GET_BLOCK_ID(ftr_header);797 switch (ftr_header) {798 799 case RIO_EFB_SER_EP_ID:800 case RIO_EFB_SER_EP_REC_ID:801 case RIO_EFB_SER_EP_FREE_ID:802 case RIO_EFB_SER_EP_M1_ID:803 case RIO_EFB_SER_EP_SW_M1_ID:804 case RIO_EFB_SER_EPF_M1_ID:805 case RIO_EFB_SER_EPF_SW_M1_ID:806 *rmap = 1;807 return ext_ftr_ptr;808 809 case RIO_EFB_SER_EP_M2_ID:810 case RIO_EFB_SER_EP_SW_M2_ID:811 case RIO_EFB_SER_EPF_M2_ID:812 case RIO_EFB_SER_EPF_SW_M2_ID:813 *rmap = 2;814 return ext_ftr_ptr;815 816 default:817 break;818 }819 820 ext_ftr_ptr = rio_mport_get_efb(port, local, destid,821 hopcount, ext_ftr_ptr);822 }823 824 return ext_ftr_ptr;825}826EXPORT_SYMBOL_GPL(rio_mport_get_physefb);827 828/**829 * rio_get_comptag - Begin or continue searching for a RIO device by component tag830 * @comp_tag: RIO component tag to match831 * @from: Previous RIO device found in search, or %NULL for new search832 *833 * Iterates through the list of known RIO devices. If a RIO device is834 * found with a matching @comp_tag, a pointer to its device835 * structure is returned. Otherwise, %NULL is returned. A new search836 * is initiated by passing %NULL to the @from argument. Otherwise, if837 * @from is not %NULL, searches continue from next device on the global838 * list.839 */840struct rio_dev *rio_get_comptag(u32 comp_tag, struct rio_dev *from)841{842 struct list_head *n;843 struct rio_dev *rdev;844 845 spin_lock(&rio_global_list_lock);846 n = from ? from->global_list.next : rio_devices.next;847 848 while (n && (n != &rio_devices)) {849 rdev = rio_dev_g(n);850 if (rdev->comp_tag == comp_tag)851 goto exit;852 n = n->next;853 }854 rdev = NULL;855exit:856 spin_unlock(&rio_global_list_lock);857 return rdev;858}859EXPORT_SYMBOL_GPL(rio_get_comptag);860 861/**862 * rio_set_port_lockout - Sets/clears LOCKOUT bit (RIO EM 1.3) for a switch port.863 * @rdev: Pointer to RIO device control structure864 * @pnum: Switch port number to set LOCKOUT bit865 * @lock: Operation : set (=1) or clear (=0)866 */867int rio_set_port_lockout(struct rio_dev *rdev, u32 pnum, int lock)868{869 u32 regval;870 871 rio_read_config_32(rdev,872 RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),873 ®val);874 if (lock)875 regval |= RIO_PORT_N_CTL_LOCKOUT;876 else877 regval &= ~RIO_PORT_N_CTL_LOCKOUT;878 879 rio_write_config_32(rdev,880 RIO_DEV_PORT_N_CTL_CSR(rdev, pnum),881 regval);882 return 0;883}884EXPORT_SYMBOL_GPL(rio_set_port_lockout);885 886/**887 * rio_enable_rx_tx_port - enable input receiver and output transmitter of888 * given port889 * @port: Master port associated with the RIO network890 * @local: local=1 select local port otherwise a far device is reached891 * @destid: Destination ID of the device to check host bit892 * @hopcount: Number of hops to reach the target893 * @port_num: Port (-number on switch) to enable on a far end device894 *895 * Returns 0 or 1 from on General Control Command and Status Register896 * (EXT_PTR+0x3C)897 */898int rio_enable_rx_tx_port(struct rio_mport *port,899 int local, u16 destid,900 u8 hopcount, u8 port_num)901{902#ifdef CONFIG_RAPIDIO_ENABLE_RX_TX_PORTS903 u32 regval;904 u32 ext_ftr_ptr;905 u32 rmap;906 907 /*908 * enable rx input tx output port909 */910 pr_debug("rio_enable_rx_tx_port(local = %d, destid = %d, hopcount = "911 "%d, port_num = %d)\n", local, destid, hopcount, port_num);912 913 ext_ftr_ptr = rio_mport_get_physefb(port, local, destid,914 hopcount, &rmap);915 916 if (local) {917 rio_local_read_config_32(port,918 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap),919 ®val);920 } else {921 if (rio_mport_read_config_32(port, destid, hopcount,922 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),923 ®val) < 0)924 return -EIO;925 }926 927 regval = regval | RIO_PORT_N_CTL_EN_RX | RIO_PORT_N_CTL_EN_TX;928 929 if (local) {930 rio_local_write_config_32(port,931 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(0, rmap), regval);932 } else {933 if (rio_mport_write_config_32(port, destid, hopcount,934 ext_ftr_ptr + RIO_PORT_N_CTL_CSR(port_num, rmap),935 regval) < 0)936 return -EIO;937 }938#endif939 return 0;940}941EXPORT_SYMBOL_GPL(rio_enable_rx_tx_port);942 943 944/**945 * rio_chk_dev_route - Validate route to the specified device.946 * @rdev: RIO device failed to respond947 * @nrdev: Last active device on the route to rdev948 * @npnum: nrdev's port number on the route to rdev949 *950 * Follows a route to the specified RIO device to determine the last available951 * device (and corresponding RIO port) on the route.952 */953static int954rio_chk_dev_route(struct rio_dev *rdev, struct rio_dev **nrdev, int *npnum)955{956 u32 result;957 int p_port, rc = -EIO;958 struct rio_dev *prev = NULL;959 960 /* Find switch with failed RIO link */961 while (rdev->prev && (rdev->prev->pef & RIO_PEF_SWITCH)) {962 if (!rio_read_config_32(rdev->prev, RIO_DEV_ID_CAR, &result)) {963 prev = rdev->prev;964 break;965 }966 rdev = rdev->prev;967 }968 969 if (!prev)970 goto err_out;971 972 p_port = prev->rswitch->route_table[rdev->destid];973 974 if (p_port != RIO_INVALID_ROUTE) {975 pr_debug("RIO: link failed on [%s]-P%d\n",976 rio_name(prev), p_port);977 *nrdev = prev;978 *npnum = p_port;979 rc = 0;980 } else981 pr_debug("RIO: failed to trace route to %s\n", rio_name(rdev));982err_out:983 return rc;984}985 986/**987 * rio_mport_chk_dev_access - Validate access to the specified device.988 * @mport: Master port to send transactions989 * @destid: Device destination ID in network990 * @hopcount: Number of hops into the network991 */992int993rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid, u8 hopcount)994{995 int i = 0;996 u32 tmp;997 998 while (rio_mport_read_config_32(mport, destid, hopcount,999 RIO_DEV_ID_CAR, &tmp)) {1000 i++;1001 if (i == RIO_MAX_CHK_RETRY)1002 return -EIO;1003 mdelay(1);1004 }1005 1006 return 0;1007}1008EXPORT_SYMBOL_GPL(rio_mport_chk_dev_access);1009 1010/**1011 * rio_chk_dev_access - Validate access to the specified device.1012 * @rdev: Pointer to RIO device control structure1013 */1014static int rio_chk_dev_access(struct rio_dev *rdev)1015{1016 return rio_mport_chk_dev_access(rdev->net->hport,1017 rdev->destid, rdev->hopcount);1018}1019 1020/**1021 * rio_get_input_status - Sends a Link-Request/Input-Status control symbol and1022 * returns link-response (if requested).1023 * @rdev: RIO devive to issue Input-status command1024 * @pnum: Device port number to issue the command1025 * @lnkresp: Response from a link partner1026 */1027static int1028rio_get_input_status(struct rio_dev *rdev, int pnum, u32 *lnkresp)1029{1030 u32 regval;1031 int checkcount;1032 1033 if (lnkresp) {1034 /* Read from link maintenance response register1035 * to clear valid bit */1036 rio_read_config_32(rdev,1037 RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),1038 ®val);1039 udelay(50);1040 }1041 1042 /* Issue Input-status command */1043 rio_write_config_32(rdev,1044 RIO_DEV_PORT_N_MNT_REQ_CSR(rdev, pnum),1045 RIO_MNT_REQ_CMD_IS);1046 1047 /* Exit if the response is not expected */1048 if (!lnkresp)1049 return 0;1050 1051 checkcount = 3;1052 while (checkcount--) {1053 udelay(50);1054 rio_read_config_32(rdev,1055 RIO_DEV_PORT_N_MNT_RSP_CSR(rdev, pnum),1056 ®val);1057 if (regval & RIO_PORT_N_MNT_RSP_RVAL) {1058 *lnkresp = regval;1059 return 0;1060 }1061 }1062 1063 return -EIO;1064}1065 1066/**1067 * rio_clr_err_stopped - Clears port Error-stopped states.1068 * @rdev: Pointer to RIO device control structure1069 * @pnum: Switch port number to clear errors1070 * @err_status: port error status (if 0 reads register from device)1071 *1072 * TODO: Currently this routine is not compatible with recovery process1073 * specified for idt_gen3 RapidIO switch devices. It has to be reviewed1074 * to implement universal recovery process that is compatible full range1075 * off available devices.1076 * IDT gen3 switch driver now implements HW-specific error handler that1077 * issues soft port reset to the port to reset ERR_STOP bits and ackIDs.1078 */1079static int rio_clr_err_stopped(struct rio_dev *rdev, u32 pnum, u32 err_status)1080{1081 struct rio_dev *nextdev = rdev->rswitch->nextdev[pnum];1082 u32 regval;1083 u32 far_ackid, far_linkstat, near_ackid;1084 1085 if (err_status == 0)1086 rio_read_config_32(rdev,1087 RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),1088 &err_status);1089 1090 if (err_status & RIO_PORT_N_ERR_STS_OUT_ES) {1091 pr_debug("RIO_EM: servicing Output Error-Stopped state\n");1092 /*1093 * Send a Link-Request/Input-Status control symbol1094 */1095 if (rio_get_input_status(rdev, pnum, ®val)) {1096 pr_debug("RIO_EM: Input-status response timeout\n");1097 goto rd_err;1098 }1099 1100 pr_debug("RIO_EM: SP%d Input-status response=0x%08x\n",1101 pnum, regval);1102 far_ackid = (regval & RIO_PORT_N_MNT_RSP_ASTAT) >> 5;1103 far_linkstat = regval & RIO_PORT_N_MNT_RSP_LSTAT;1104 rio_read_config_32(rdev,1105 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),1106 ®val);1107 pr_debug("RIO_EM: SP%d_ACK_STS_CSR=0x%08x\n", pnum, regval);1108 near_ackid = (regval & RIO_PORT_N_ACK_INBOUND) >> 24;1109 pr_debug("RIO_EM: SP%d far_ackID=0x%02x far_linkstat=0x%02x" \1110 " near_ackID=0x%02x\n",1111 pnum, far_ackid, far_linkstat, near_ackid);1112 1113 /*1114 * If required, synchronize ackIDs of near and1115 * far sides.1116 */1117 if ((far_ackid != ((regval & RIO_PORT_N_ACK_OUTSTAND) >> 8)) ||1118 (far_ackid != (regval & RIO_PORT_N_ACK_OUTBOUND))) {1119 /* Align near outstanding/outbound ackIDs with1120 * far inbound.1121 */1122 rio_write_config_32(rdev,1123 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, pnum),1124 (near_ackid << 24) |1125 (far_ackid << 8) | far_ackid);1126 /* Align far outstanding/outbound ackIDs with1127 * near inbound.1128 */1129 far_ackid++;1130 if (!nextdev) {1131 pr_debug("RIO_EM: nextdev pointer == NULL\n");1132 goto rd_err;1133 }1134 1135 rio_write_config_32(nextdev,1136 RIO_DEV_PORT_N_ACK_STS_CSR(nextdev,1137 RIO_GET_PORT_NUM(nextdev->swpinfo)),1138 (far_ackid << 24) |1139 (near_ackid << 8) | near_ackid);1140 }1141rd_err:1142 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),1143 &err_status);1144 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);1145 }1146 1147 if ((err_status & RIO_PORT_N_ERR_STS_INP_ES) && nextdev) {1148 pr_debug("RIO_EM: servicing Input Error-Stopped state\n");1149 rio_get_input_status(nextdev,1150 RIO_GET_PORT_NUM(nextdev->swpinfo), NULL);1151 udelay(50);1152 1153 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, pnum),1154 &err_status);1155 pr_debug("RIO_EM: SP%d_ERR_STS_CSR=0x%08x\n", pnum, err_status);1156 }1157 1158 return (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |1159 RIO_PORT_N_ERR_STS_INP_ES)) ? 1 : 0;1160}1161 1162/**1163 * rio_inb_pwrite_handler - inbound port-write message handler1164 * @mport: mport device associated with port-write1165 * @pw_msg: pointer to inbound port-write message1166 *1167 * Processes an inbound port-write message. Returns 0 if the request1168 * has been satisfied.1169 */1170int rio_inb_pwrite_handler(struct rio_mport *mport, union rio_pw_msg *pw_msg)1171{1172 struct rio_dev *rdev;1173 u32 err_status, em_perrdet, em_ltlerrdet;1174 int rc, portnum;1175 struct rio_pwrite *pwrite;1176 1177#ifdef DEBUG_PW1178 {1179 u32 i;1180 1181 pr_debug("%s: PW to mport_%d:\n", __func__, mport->id);1182 for (i = 0; i < RIO_PW_MSG_SIZE / sizeof(u32); i = i + 4) {1183 pr_debug("0x%02x: %08x %08x %08x %08x\n",1184 i * 4, pw_msg->raw[i], pw_msg->raw[i + 1],1185 pw_msg->raw[i + 2], pw_msg->raw[i + 3]);1186 }1187 }1188#endif1189 1190 rdev = rio_get_comptag((pw_msg->em.comptag & RIO_CTAG_UDEVID), NULL);1191 if (rdev) {1192 pr_debug("RIO: Port-Write message from %s\n", rio_name(rdev));1193 } else {1194 pr_debug("RIO: %s No matching device for CTag 0x%08x\n",1195 __func__, pw_msg->em.comptag);1196 }1197 1198 /* Call a device-specific handler (if it is registered for the device).1199 * This may be the service for endpoints that send device-specific1200 * port-write messages. End-point messages expected to be handled1201 * completely by EP specific device driver.1202 * For switches rc==0 signals that no standard processing required.1203 */1204 if (rdev && rdev->pwcback) {1205 rc = rdev->pwcback(rdev, pw_msg, 0);1206 if (rc == 0)1207 return 0;1208 }1209 1210 mutex_lock(&mport->lock);1211 list_for_each_entry(pwrite, &mport->pwrites, node)1212 pwrite->pwcback(mport, pwrite->context, pw_msg, 0);1213 mutex_unlock(&mport->lock);1214 1215 if (!rdev)1216 return 0;1217 1218 /*1219 * FIXME: The code below stays as it was before for now until we decide1220 * how to do default PW handling in combination with per-mport callbacks1221 */1222 1223 portnum = pw_msg->em.is_port & 0xFF;1224 1225 /* Check if device and route to it are functional:1226 * Sometimes devices may send PW message(s) just before being1227 * powered down (or link being lost).1228 */1229 if (rio_chk_dev_access(rdev)) {1230 pr_debug("RIO: device access failed - get link partner\n");1231 /* Scan route to the device and identify failed link.1232 * This will replace device and port reported in PW message.1233 * PW message should not be used after this point.1234 */1235 if (rio_chk_dev_route(rdev, &rdev, &portnum)) {1236 pr_err("RIO: Route trace for %s failed\n",1237 rio_name(rdev));1238 return -EIO;1239 }1240 pw_msg = NULL;1241 }1242 1243 /* For End-point devices processing stops here */1244 if (!(rdev->pef & RIO_PEF_SWITCH))1245 return 0;1246 1247 if (rdev->phys_efptr == 0) {1248 pr_err("RIO_PW: Bad switch initialization for %s\n",1249 rio_name(rdev));1250 return 0;1251 }1252 1253 /*1254 * Process the port-write notification from switch1255 */1256 if (rdev->rswitch->ops && rdev->rswitch->ops->em_handle)1257 rdev->rswitch->ops->em_handle(rdev, portnum);1258 1259 rio_read_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),1260 &err_status);1261 pr_debug("RIO_PW: SP%d_ERR_STS_CSR=0x%08x\n", portnum, err_status);1262 1263 if (err_status & RIO_PORT_N_ERR_STS_PORT_OK) {1264 1265 if (!(rdev->rswitch->port_ok & (1 << portnum))) {1266 rdev->rswitch->port_ok |= (1 << portnum);1267 rio_set_port_lockout(rdev, portnum, 0);1268 /* Schedule Insertion Service */1269 pr_debug("RIO_PW: Device Insertion on [%s]-P%d\n",1270 rio_name(rdev), portnum);1271 }1272 1273 /* Clear error-stopped states (if reported).1274 * Depending on the link partner state, two attempts1275 * may be needed for successful recovery.1276 */1277 if (err_status & (RIO_PORT_N_ERR_STS_OUT_ES |1278 RIO_PORT_N_ERR_STS_INP_ES)) {1279 if (rio_clr_err_stopped(rdev, portnum, err_status))1280 rio_clr_err_stopped(rdev, portnum, 0);1281 }1282 } else { /* if (err_status & RIO_PORT_N_ERR_STS_PORT_UNINIT) */1283 1284 if (rdev->rswitch->port_ok & (1 << portnum)) {1285 rdev->rswitch->port_ok &= ~(1 << portnum);1286 rio_set_port_lockout(rdev, portnum, 1);1287 1288 if (rdev->phys_rmap == 1) {1289 rio_write_config_32(rdev,1290 RIO_DEV_PORT_N_ACK_STS_CSR(rdev, portnum),1291 RIO_PORT_N_ACK_CLEAR);1292 } else {1293 rio_write_config_32(rdev,1294 RIO_DEV_PORT_N_OB_ACK_CSR(rdev, portnum),1295 RIO_PORT_N_OB_ACK_CLEAR);1296 rio_write_config_32(rdev,1297 RIO_DEV_PORT_N_IB_ACK_CSR(rdev, portnum),1298 0);1299 }1300 1301 /* Schedule Extraction Service */1302 pr_debug("RIO_PW: Device Extraction on [%s]-P%d\n",1303 rio_name(rdev), portnum);1304 }1305 }1306 1307 rio_read_config_32(rdev,1308 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), &em_perrdet);1309 if (em_perrdet) {1310 pr_debug("RIO_PW: RIO_EM_P%d_ERR_DETECT=0x%08x\n",1311 portnum, em_perrdet);1312 /* Clear EM Port N Error Detect CSR */1313 rio_write_config_32(rdev,1314 rdev->em_efptr + RIO_EM_PN_ERR_DETECT(portnum), 0);1315 }1316 1317 rio_read_config_32(rdev,1318 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, &em_ltlerrdet);1319 if (em_ltlerrdet) {1320 pr_debug("RIO_PW: RIO_EM_LTL_ERR_DETECT=0x%08x\n",1321 em_ltlerrdet);1322 /* Clear EM L/T Layer Error Detect CSR */1323 rio_write_config_32(rdev,1324 rdev->em_efptr + RIO_EM_LTL_ERR_DETECT, 0);1325 }1326 1327 /* Clear remaining error bits and Port-Write Pending bit */1328 rio_write_config_32(rdev, RIO_DEV_PORT_N_ERR_STS_CSR(rdev, portnum),1329 err_status);1330 1331 return 0;1332}1333EXPORT_SYMBOL_GPL(rio_inb_pwrite_handler);1334 1335/**1336 * rio_mport_get_efb - get pointer to next extended features block1337 * @port: Master port to issue transaction1338 * @local: Indicate a local master port or remote device access1339 * @destid: Destination ID of the device1340 * @hopcount: Number of switch hops to the device1341 * @from: Offset of current Extended Feature block header (if 0 starts1342 * from ExtFeaturePtr)1343 */1344u321345rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,1346 u8 hopcount, u32 from)1347{1348 u32 reg_val;1349 1350 if (from == 0) {1351 if (local)1352 rio_local_read_config_32(port, RIO_ASM_INFO_CAR,1353 ®_val);1354 else1355 rio_mport_read_config_32(port, destid, hopcount,1356 RIO_ASM_INFO_CAR, ®_val);1357 return reg_val & RIO_EXT_FTR_PTR_MASK;1358 } else {1359 if (local)1360 rio_local_read_config_32(port, from, ®_val);1361 else1362 rio_mport_read_config_32(port, destid, hopcount,1363 from, ®_val);1364 return RIO_GET_BLOCK_ID(reg_val);1365 }1366}1367EXPORT_SYMBOL_GPL(rio_mport_get_efb);1368 1369/**1370 * rio_mport_get_feature - query for devices' extended features1371 * @port: Master port to issue transaction1372 * @local: Indicate a local master port or remote device access1373 * @destid: Destination ID of the device1374 * @hopcount: Number of switch hops to the device1375 * @ftr: Extended feature code1376 *1377 * Tell if a device supports a given RapidIO capability.1378 * Returns the offset of the requested extended feature1379 * block within the device's RIO configuration space or1380 * 0 in case the device does not support it.1381 */1382u321383rio_mport_get_feature(struct rio_mport * port, int local, u16 destid,1384 u8 hopcount, int ftr)1385{1386 u32 asm_info, ext_ftr_ptr, ftr_header;1387 1388 if (local)1389 rio_local_read_config_32(port, RIO_ASM_INFO_CAR, &asm_info);1390 else1391 rio_mport_read_config_32(port, destid, hopcount,1392 RIO_ASM_INFO_CAR, &asm_info);1393 1394 ext_ftr_ptr = asm_info & RIO_EXT_FTR_PTR_MASK;1395 1396 while (ext_ftr_ptr) {1397 if (local)1398 rio_local_read_config_32(port, ext_ftr_ptr,1399 &ftr_header);1400 else1401 rio_mport_read_config_32(port, destid, hopcount,1402 ext_ftr_ptr, &ftr_header);1403 if (RIO_GET_BLOCK_ID(ftr_header) == ftr)1404 return ext_ftr_ptr;1405 1406 ext_ftr_ptr = RIO_GET_BLOCK_PTR(ftr_header);1407 if (!ext_ftr_ptr)1408 break;1409 }1410 1411 return 0;1412}1413EXPORT_SYMBOL_GPL(rio_mport_get_feature);1414 1415/**1416 * rio_std_route_add_entry - Add switch route table entry using standard1417 * registers defined in RIO specification rev.1.31418 * @mport: Master port to issue transaction1419 * @destid: Destination ID of the device1420 * @hopcount: Number of switch hops to the device1421 * @table: routing table ID (global or port-specific)1422 * @route_destid: destID entry in the RT1423 * @route_port: destination port for specified destID1424 */1425static int1426rio_std_route_add_entry(struct rio_mport *mport, u16 destid, u8 hopcount,1427 u16 table, u16 route_destid, u8 route_port)1428{1429 if (table == RIO_GLOBAL_TABLE) {1430 rio_mport_write_config_32(mport, destid, hopcount,1431 RIO_STD_RTE_CONF_DESTID_SEL_CSR,1432 (u32)route_destid);1433 rio_mport_write_config_32(mport, destid, hopcount,1434 RIO_STD_RTE_CONF_PORT_SEL_CSR,1435 (u32)route_port);1436 }1437 1438 udelay(10);1439 return 0;1440}1441 1442/**1443 * rio_std_route_get_entry - Read switch route table entry (port number)1444 * associated with specified destID using standard registers defined in RIO1445 * specification rev.1.31446 * @mport: Master port to issue transaction1447 * @destid: Destination ID of the device1448 * @hopcount: Number of switch hops to the device1449 * @table: routing table ID (global or port-specific)1450 * @route_destid: destID entry in the RT1451 * @route_port: returned destination port for specified destID1452 */1453static int1454rio_std_route_get_entry(struct rio_mport *mport, u16 destid, u8 hopcount,1455 u16 table, u16 route_destid, u8 *route_port)1456{1457 u32 result;1458 1459 if (table == RIO_GLOBAL_TABLE) {1460 rio_mport_write_config_32(mport, destid, hopcount,1461 RIO_STD_RTE_CONF_DESTID_SEL_CSR, route_destid);1462 rio_mport_read_config_32(mport, destid, hopcount,1463 RIO_STD_RTE_CONF_PORT_SEL_CSR, &result);1464 1465 *route_port = (u8)result;1466 }1467 1468 return 0;1469}1470 1471/**1472 * rio_std_route_clr_table - Clear swotch route table using standard registers1473 * defined in RIO specification rev.1.3.1474 * @mport: Master port to issue transaction1475 * @destid: Destination ID of the device1476 * @hopcount: Number of switch hops to the device1477 * @table: routing table ID (global or port-specific)1478 */1479static int1480rio_std_route_clr_table(struct rio_mport *mport, u16 destid, u8 hopcount,1481 u16 table)1482{1483 u32 max_destid = 0xff;1484 u32 i, pef, id_inc = 1, ext_cfg = 0;1485 u32 port_sel = RIO_INVALID_ROUTE;1486 1487 if (table == RIO_GLOBAL_TABLE) {1488 rio_mport_read_config_32(mport, destid, hopcount,1489 RIO_PEF_CAR, &pef);1490 1491 if (mport->sys_size) {1492 rio_mport_read_config_32(mport, destid, hopcount,1493 RIO_SWITCH_RT_LIMIT,1494 &max_destid);1495 max_destid &= RIO_RT_MAX_DESTID;1496 }1497 1498 if (pef & RIO_PEF_EXT_RT) {1499 ext_cfg = 0x80000000;1500 id_inc = 4;1501 port_sel = (RIO_INVALID_ROUTE << 24) |1502 (RIO_INVALID_ROUTE << 16) |1503 (RIO_INVALID_ROUTE << 8) |1504 RIO_INVALID_ROUTE;1505 }1506 1507 for (i = 0; i <= max_destid;) {1508 rio_mport_write_config_32(mport, destid, hopcount,1509 RIO_STD_RTE_CONF_DESTID_SEL_CSR,1510 ext_cfg | i);1511 rio_mport_write_config_32(mport, destid, hopcount,1512 RIO_STD_RTE_CONF_PORT_SEL_CSR,1513 port_sel);1514 i += id_inc;1515 }1516 }1517 1518 udelay(10);1519 return 0;1520}1521 1522/**1523 * rio_lock_device - Acquires host device lock for specified device1524 * @port: Master port to send transaction1525 * @destid: Destination ID for device/switch1526 * @hopcount: Hopcount to reach switch1527 * @wait_ms: Max wait time in msec (0 = no timeout)1528 *1529 * Attepts to acquire host device lock for specified device1530 * Returns 0 if device lock acquired or EINVAL if timeout expires.1531 */1532int rio_lock_device(struct rio_mport *port, u16 destid,1533 u8 hopcount, int wait_ms)1534{1535 u32 result;1536 int tcnt = 0;1537 1538 /* Attempt to acquire device lock */1539 rio_mport_write_config_32(port, destid, hopcount,1540 RIO_HOST_DID_LOCK_CSR, port->host_deviceid);1541 rio_mport_read_config_32(port, destid, hopcount,1542 RIO_HOST_DID_LOCK_CSR, &result);1543 1544 while (result != port->host_deviceid) {1545 if (wait_ms != 0 && tcnt == wait_ms) {1546 pr_debug("RIO: timeout when locking device %x:%x\n",1547 destid, hopcount);1548 return -EINVAL;1549 }1550 1551 /* Delay a bit */1552 mdelay(1);1553 tcnt++;1554 /* Try to acquire device lock again */1555 rio_mport_write_config_32(port, destid,1556 hopcount,1557 RIO_HOST_DID_LOCK_CSR,1558 port->host_deviceid);1559 rio_mport_read_config_32(port, destid,1560 hopcount,1561 RIO_HOST_DID_LOCK_CSR, &result);1562 }1563 1564 return 0;1565}1566EXPORT_SYMBOL_GPL(rio_lock_device);1567 1568/**1569 * rio_unlock_device - Releases host device lock for specified device1570 * @port: Master port to send transaction1571 * @destid: Destination ID for device/switch1572 * @hopcount: Hopcount to reach switch1573 *1574 * Returns 0 if device lock released or EINVAL if fails.1575 */1576int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount)1577{1578 u32 result;1579 1580 /* Release device lock */1581 rio_mport_write_config_32(port, destid,1582 hopcount,1583 RIO_HOST_DID_LOCK_CSR,1584 port->host_deviceid);1585 rio_mport_read_config_32(port, destid, hopcount,1586 RIO_HOST_DID_LOCK_CSR, &result);1587 if ((result & 0xffff) != 0xffff) {1588 pr_debug("RIO: badness when releasing device lock %x:%x\n",1589 destid, hopcount);1590 return -EINVAL;1591 }1592 1593 return 0;1594}1595EXPORT_SYMBOL_GPL(rio_unlock_device);1596 1597/**1598 * rio_route_add_entry- Add a route entry to a switch routing table1599 * @rdev: RIO device1600 * @table: Routing table ID1601 * @route_destid: Destination ID to be routed1602 * @route_port: Port number to be routed1603 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)1604 *1605 * If available calls the switch specific add_entry() method to add a route1606 * entry into a switch routing table. Otherwise uses standard RT update method1607 * as defined by RapidIO specification. A specific routing table can be selected1608 * using the @table argument if a switch has per port routing tables or1609 * the standard (or global) table may be used by passing1610 * %RIO_GLOBAL_TABLE in @table.1611 *1612 * Returns %0 on success or %-EINVAL on failure.1613 */1614int rio_route_add_entry(struct rio_dev *rdev,1615 u16 table, u16 route_destid, u8 route_port, int lock)1616{1617 int rc = -EINVAL;1618 struct rio_switch_ops *ops = rdev->rswitch->ops;1619 1620 if (lock) {1621 rc = rio_lock_device(rdev->net->hport, rdev->destid,1622 rdev->hopcount, 1000);1623 if (rc)1624 return rc;1625 }1626 1627 spin_lock(&rdev->rswitch->lock);1628 1629 if (!ops || !ops->add_entry) {1630 rc = rio_std_route_add_entry(rdev->net->hport, rdev->destid,1631 rdev->hopcount, table,1632 route_destid, route_port);1633 } else if (try_module_get(ops->owner)) {1634 rc = ops->add_entry(rdev->net->hport, rdev->destid,1635 rdev->hopcount, table, route_destid,1636 route_port);1637 module_put(ops->owner);1638 }1639 1640 spin_unlock(&rdev->rswitch->lock);1641 1642 if (lock)1643 rio_unlock_device(rdev->net->hport, rdev->destid,1644 rdev->hopcount);1645 1646 return rc;1647}1648EXPORT_SYMBOL_GPL(rio_route_add_entry);1649 1650/**1651 * rio_route_get_entry- Read an entry from a switch routing table1652 * @rdev: RIO device1653 * @table: Routing table ID1654 * @route_destid: Destination ID to be routed1655 * @route_port: Pointer to read port number into1656 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)1657 *1658 * If available calls the switch specific get_entry() method to fetch a route1659 * entry from a switch routing table. Otherwise uses standard RT read method1660 * as defined by RapidIO specification. A specific routing table can be selected1661 * using the @table argument if a switch has per port routing tables or1662 * the standard (or global) table may be used by passing1663 * %RIO_GLOBAL_TABLE in @table.1664 *1665 * Returns %0 on success or %-EINVAL on failure.1666 */1667int rio_route_get_entry(struct rio_dev *rdev, u16 table,1668 u16 route_destid, u8 *route_port, int lock)1669{1670 int rc = -EINVAL;1671 struct rio_switch_ops *ops = rdev->rswitch->ops;1672 1673 if (lock) {1674 rc = rio_lock_device(rdev->net->hport, rdev->destid,1675 rdev->hopcount, 1000);1676 if (rc)1677 return rc;1678 }1679 1680 spin_lock(&rdev->rswitch->lock);1681 1682 if (!ops || !ops->get_entry) {1683 rc = rio_std_route_get_entry(rdev->net->hport, rdev->destid,1684 rdev->hopcount, table,1685 route_destid, route_port);1686 } else if (try_module_get(ops->owner)) {1687 rc = ops->get_entry(rdev->net->hport, rdev->destid,1688 rdev->hopcount, table, route_destid,1689 route_port);1690 module_put(ops->owner);1691 }1692 1693 spin_unlock(&rdev->rswitch->lock);1694 1695 if (lock)1696 rio_unlock_device(rdev->net->hport, rdev->destid,1697 rdev->hopcount);1698 return rc;1699}1700EXPORT_SYMBOL_GPL(rio_route_get_entry);1701 1702/**1703 * rio_route_clr_table - Clear a switch routing table1704 * @rdev: RIO device1705 * @table: Routing table ID1706 * @lock: apply a hardware lock on switch device flag (1=lock, 0=no_lock)1707 *1708 * If available calls the switch specific clr_table() method to clear a switch1709 * routing table. Otherwise uses standard RT write method as defined by RapidIO1710 * specification. A specific routing table can be selected using the @table1711 * argument if a switch has per port routing tables or the standard (or global)1712 * table may be used by passing %RIO_GLOBAL_TABLE in @table.1713 *1714 * Returns %0 on success or %-EINVAL on failure.1715 */1716int rio_route_clr_table(struct rio_dev *rdev, u16 table, int lock)1717{1718 int rc = -EINVAL;1719 struct rio_switch_ops *ops = rdev->rswitch->ops;1720 1721 if (lock) {1722 rc = rio_lock_device(rdev->net->hport, rdev->destid,1723 rdev->hopcount, 1000);1724 if (rc)1725 return rc;1726 }1727 1728 spin_lock(&rdev->rswitch->lock);1729 1730 if (!ops || !ops->clr_table) {1731 rc = rio_std_route_clr_table(rdev->net->hport, rdev->destid,1732 rdev->hopcount, table);1733 } else if (try_module_get(ops->owner)) {1734 rc = ops->clr_table(rdev->net->hport, rdev->destid,1735 rdev->hopcount, table);1736 1737 module_put(ops->owner);1738 }1739 1740 spin_unlock(&rdev->rswitch->lock);1741 1742 if (lock)1743 rio_unlock_device(rdev->net->hport, rdev->destid,1744 rdev->hopcount);1745 1746 return rc;1747}1748EXPORT_SYMBOL_GPL(rio_route_clr_table);1749 1750#ifdef CONFIG_RAPIDIO_DMA_ENGINE1751 1752static bool rio_chan_filter(struct dma_chan *chan, void *arg)1753{1754 struct rio_mport *mport = arg;1755 1756 /* Check that DMA device belongs to the right MPORT */1757 return mport == container_of(chan->device, struct rio_mport, dma);1758}1759 1760/**1761 * rio_request_mport_dma - request RapidIO capable DMA channel associated1762 * with specified local RapidIO mport device.1763 * @mport: RIO mport to perform DMA data transfers1764 *1765 * Returns pointer to allocated DMA channel or NULL if failed.1766 */1767struct dma_chan *rio_request_mport_dma(struct rio_mport *mport)1768{1769 dma_cap_mask_t mask;1770 1771 dma_cap_zero(mask);1772 dma_cap_set(DMA_SLAVE, mask);1773 return dma_request_channel(mask, rio_chan_filter, mport);1774}1775EXPORT_SYMBOL_GPL(rio_request_mport_dma);1776 1777/**1778 * rio_request_dma - request RapidIO capable DMA channel that supports1779 * specified target RapidIO device.1780 * @rdev: RIO device associated with DMA transfer1781 *1782 * Returns pointer to allocated DMA channel or NULL if failed.1783 */1784struct dma_chan *rio_request_dma(struct rio_dev *rdev)1785{1786 return rio_request_mport_dma(rdev->net->hport);1787}1788EXPORT_SYMBOL_GPL(rio_request_dma);1789 1790/**1791 * rio_release_dma - release specified DMA channel1792 * @dchan: DMA channel to release1793 */1794void rio_release_dma(struct dma_chan *dchan)1795{1796 dma_release_channel(dchan);1797}1798EXPORT_SYMBOL_GPL(rio_release_dma);1799 1800/**1801 * rio_dma_prep_xfer - RapidIO specific wrapper1802 * for device_prep_slave_sg callback defined by DMAENGINE.1803 * @dchan: DMA channel to configure1804 * @destid: target RapidIO device destination ID1805 * @data: RIO specific data descriptor1806 * @direction: DMA data transfer direction (TO or FROM the device)1807 * @flags: dmaengine defined flags1808 *1809 * Initializes RapidIO capable DMA channel for the specified data transfer.1810 * Uses DMA channel private extension to pass information related to remote1811 * target RIO device.1812 *1813 * Returns: pointer to DMA transaction descriptor if successful,1814 * error-valued pointer or NULL if failed.1815 */1816struct dma_async_tx_descriptor *rio_dma_prep_xfer(struct dma_chan *dchan,1817 u16 destid, struct rio_dma_data *data,1818 enum dma_transfer_direction direction, unsigned long flags)1819{1820 struct rio_dma_ext rio_ext;1821 1822 if (!dchan->device->device_prep_slave_sg) {1823 pr_err("%s: prep_rio_sg == NULL\n", __func__);1824 return NULL;1825 }1826 1827 rio_ext.destid = destid;1828 rio_ext.rio_addr_u = data->rio_addr_u;1829 rio_ext.rio_addr = data->rio_addr;1830 rio_ext.wr_type = data->wr_type;1831 1832 return dmaengine_prep_rio_sg(dchan, data->sg, data->sg_len,1833 direction, flags, &rio_ext);1834}1835EXPORT_SYMBOL_GPL(rio_dma_prep_xfer);1836 1837/**1838 * rio_dma_prep_slave_sg - RapidIO specific wrapper1839 * for device_prep_slave_sg callback defined by DMAENGINE.1840 * @rdev: RIO device control structure1841 * @dchan: DMA channel to configure1842 * @data: RIO specific data descriptor1843 * @direction: DMA data transfer direction (TO or FROM the device)1844 * @flags: dmaengine defined flags1845 *1846 * Initializes RapidIO capable DMA channel for the specified data transfer.1847 * Uses DMA channel private extension to pass information related to remote1848 * target RIO device.1849 *1850 * Returns: pointer to DMA transaction descriptor if successful,1851 * error-valued pointer or NULL if failed.1852 */1853struct dma_async_tx_descriptor *rio_dma_prep_slave_sg(struct rio_dev *rdev,1854 struct dma_chan *dchan, struct rio_dma_data *data,1855 enum dma_transfer_direction direction, unsigned long flags)1856{1857 return rio_dma_prep_xfer(dchan, rdev->destid, data, direction, flags);1858}1859EXPORT_SYMBOL_GPL(rio_dma_prep_slave_sg);1860 1861#endif /* CONFIG_RAPIDIO_DMA_ENGINE */1862 1863/**1864 * rio_find_mport - find RIO mport by its ID1865 * @mport_id: number (ID) of mport device1866 *1867 * Given a RIO mport number, the desired mport is located1868 * in the global list of mports. If the mport is found, a pointer to its1869 * data structure is returned. If no mport is found, %NULL is returned.1870 */1871struct rio_mport *rio_find_mport(int mport_id)1872{1873 struct rio_mport *port;1874 1875 mutex_lock(&rio_mport_list_lock);1876 list_for_each_entry(port, &rio_mports, node) {1877 if (port->id == mport_id)1878 goto found;1879 }1880 port = NULL;1881found:1882 mutex_unlock(&rio_mport_list_lock);1883 1884 return port;1885}1886 1887/**1888 * rio_register_scan - enumeration/discovery method registration interface1889 * @mport_id: mport device ID for which fabric scan routine has to be set1890 * (RIO_MPORT_ANY = set for all available mports)1891 * @scan_ops: enumeration/discovery operations structure1892 *1893 * Registers enumeration/discovery operations with RapidIO subsystem and1894 * attaches it to the specified mport device (or all available mports1895 * if RIO_MPORT_ANY is specified).1896 *1897 * Returns error if the mport already has an enumerator attached to it.1898 * In case of RIO_MPORT_ANY skips mports with valid scan routines (no error).1899 */1900int rio_register_scan(int mport_id, struct rio_scan *scan_ops)1901{1902 struct rio_mport *port;1903 struct rio_scan_node *scan;1904 int rc = 0;1905 1906 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);1907 1908 if ((mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS) ||1909 !scan_ops)1910 return -EINVAL;1911 1912 mutex_lock(&rio_mport_list_lock);1913 1914 /*1915 * Check if there is another enumerator already registered for1916 * the same mport ID (including RIO_MPORT_ANY). Multiple enumerators1917 * for the same mport ID are not supported.1918 */1919 list_for_each_entry(scan, &rio_scans, node) {1920 if (scan->mport_id == mport_id) {1921 rc = -EBUSY;1922 goto err_out;1923 }1924 }1925 1926 /*1927 * Allocate and initialize new scan registration node.1928 */1929 scan = kzalloc(sizeof(*scan), GFP_KERNEL);1930 if (!scan) {1931 rc = -ENOMEM;1932 goto err_out;1933 }1934 1935 scan->mport_id = mport_id;1936 scan->ops = scan_ops;1937 1938 /*1939 * Traverse the list of registered mports to attach this new scan.1940 *1941 * The new scan with matching mport ID overrides any previously attached1942 * scan assuming that old scan (if any) is the default one (based on the1943 * enumerator registration check above).1944 * If the new scan is the global one, it will be attached only to mports1945 * that do not have their own individual operations already attached.1946 */1947 list_for_each_entry(port, &rio_mports, node) {1948 if (port->id == mport_id) {1949 port->nscan = scan_ops;1950 break;1951 } else if (mport_id == RIO_MPORT_ANY && !port->nscan)1952 port->nscan = scan_ops;1953 }1954 1955 list_add_tail(&scan->node, &rio_scans);1956 1957err_out:1958 mutex_unlock(&rio_mport_list_lock);1959 1960 return rc;1961}1962EXPORT_SYMBOL_GPL(rio_register_scan);1963 1964/**1965 * rio_unregister_scan - removes enumeration/discovery method from mport1966 * @mport_id: mport device ID for which fabric scan routine has to be1967 * unregistered (RIO_MPORT_ANY = apply to all mports that use1968 * the specified scan_ops)1969 * @scan_ops: enumeration/discovery operations structure1970 *1971 * Removes enumeration or discovery method assigned to the specified mport1972 * device. If RIO_MPORT_ANY is specified, removes the specified operations from1973 * all mports that have them attached.1974 */1975int rio_unregister_scan(int mport_id, struct rio_scan *scan_ops)1976{1977 struct rio_mport *port;1978 struct rio_scan_node *scan;1979 1980 pr_debug("RIO: %s for mport_id=%d\n", __func__, mport_id);1981 1982 if (mport_id != RIO_MPORT_ANY && mport_id >= RIO_MAX_MPORTS)1983 return -EINVAL;1984 1985 mutex_lock(&rio_mport_list_lock);1986 1987 list_for_each_entry(port, &rio_mports, node)1988 if (port->id == mport_id ||1989 (mport_id == RIO_MPORT_ANY && port->nscan == scan_ops))1990 port->nscan = NULL;1991 1992 list_for_each_entry(scan, &rio_scans, node) {1993 if (scan->mport_id == mport_id) {1994 list_del(&scan->node);1995 kfree(scan);1996 break;1997 }1998 }1999 2000 mutex_unlock(&rio_mport_list_lock);2001 2002 return 0;2003}2004EXPORT_SYMBOL_GPL(rio_unregister_scan);2005 2006/**2007 * rio_mport_scan - execute enumeration/discovery on the specified mport2008 * @mport_id: number (ID) of mport device2009 */2010int rio_mport_scan(int mport_id)2011{2012 struct rio_mport *port = NULL;2013 int rc;2014 2015 mutex_lock(&rio_mport_list_lock);2016 list_for_each_entry(port, &rio_mports, node) {2017 if (port->id == mport_id)2018 goto found;2019 }2020 mutex_unlock(&rio_mport_list_lock);2021 return -ENODEV;2022found:2023 if (!port->nscan) {2024 mutex_unlock(&rio_mport_list_lock);2025 return -EINVAL;2026 }2027 2028 if (!try_module_get(port->nscan->owner)) {2029 mutex_unlock(&rio_mport_list_lock);2030 return -ENODEV;2031 }2032 2033 mutex_unlock(&rio_mport_list_lock);2034 2035 if (port->host_deviceid >= 0)2036 rc = port->nscan->enumerate(port, 0);2037 else2038 rc = port->nscan->discover(port, RIO_SCAN_ENUM_NO_WAIT);2039 2040 module_put(port->nscan->owner);2041 return rc;2042}2043 2044static struct workqueue_struct *rio_wq;2045 2046struct rio_disc_work {2047 struct work_struct work;2048 struct rio_mport *mport;2049};2050 2051static void disc_work_handler(struct work_struct *_work)2052{2053 struct rio_disc_work *work;2054 2055 work = container_of(_work, struct rio_disc_work, work);2056 pr_debug("RIO: discovery work for mport %d %s\n",2057 work->mport->id, work->mport->name);2058 if (try_module_get(work->mport->nscan->owner)) {2059 work->mport->nscan->discover(work->mport, 0);2060 module_put(work->mport->nscan->owner);2061 }2062}2063 2064int rio_init_mports(void)2065{2066 struct rio_mport *port;2067 struct rio_disc_work *work;2068 int n = 0;2069 2070 if (!next_portid)2071 return -ENODEV;2072 2073 /*2074 * First, run enumerations and check if we need to perform discovery2075 * on any of the registered mports.2076 */2077 mutex_lock(&rio_mport_list_lock);2078 list_for_each_entry(port, &rio_mports, node) {2079 if (port->host_deviceid >= 0) {2080 if (port->nscan && try_module_get(port->nscan->owner)) {2081 port->nscan->enumerate(port, 0);2082 module_put(port->nscan->owner);2083 }2084 } else2085 n++;2086 }2087 mutex_unlock(&rio_mport_list_lock);2088 2089 if (!n)2090 goto no_disc;2091 2092 /*2093 * If we have mports that require discovery schedule a discovery work2094 * for each of them. If the code below fails to allocate needed2095 * resources, exit without error to keep results of enumeration2096 * process (if any).2097 * TODO: Implement restart of discovery process for all or2098 * individual discovering mports.2099 */2100 rio_wq = alloc_workqueue("riodisc", 0, 0);2101 if (!rio_wq) {2102 pr_err("RIO: unable allocate rio_wq\n");2103 goto no_disc;2104 }2105 2106 work = kcalloc(n, sizeof *work, GFP_KERNEL);2107 if (!work) {2108 destroy_workqueue(rio_wq);2109 goto no_disc;2110 }2111 2112 n = 0;2113 mutex_lock(&rio_mport_list_lock);2114 list_for_each_entry(port, &rio_mports, node) {2115 if (port->host_deviceid < 0 && port->nscan) {2116 work[n].mport = port;2117 INIT_WORK(&work[n].work, disc_work_handler);2118 queue_work(rio_wq, &work[n].work);2119 n++;2120 }2121 }2122 2123 flush_workqueue(rio_wq);2124 mutex_unlock(&rio_mport_list_lock);2125 pr_debug("RIO: destroy discovery workqueue\n");2126 destroy_workqueue(rio_wq);2127 kfree(work);2128 2129no_disc:2130 return 0;2131}2132EXPORT_SYMBOL_GPL(rio_init_mports);2133 2134static int rio_get_hdid(int index)2135{2136 if (ids_num == 0 || ids_num <= index || index >= RIO_MAX_MPORTS)2137 return -1;2138 2139 return hdid[index];2140}2141 2142int rio_mport_initialize(struct rio_mport *mport)2143{2144 if (next_portid >= RIO_MAX_MPORTS) {2145 pr_err("RIO: reached specified max number of mports\n");2146 return -ENODEV;2147 }2148 2149 atomic_set(&mport->state, RIO_DEVICE_INITIALIZING);2150 mport->id = next_portid++;2151 mport->host_deviceid = rio_get_hdid(mport->id);2152 mport->nscan = NULL;2153 mutex_init(&mport->lock);2154 mport->pwe_refcnt = 0;2155 INIT_LIST_HEAD(&mport->pwrites);2156 2157 return 0;2158}2159EXPORT_SYMBOL_GPL(rio_mport_initialize);2160 2161int rio_register_mport(struct rio_mport *port)2162{2163 struct rio_scan_node *scan = NULL;2164 int res = 0;2165 2166 mutex_lock(&rio_mport_list_lock);2167 2168 /*2169 * Check if there are any registered enumeration/discovery operations2170 * that have to be attached to the added mport.2171 */2172 list_for_each_entry(scan, &rio_scans, node) {2173 if (port->id == scan->mport_id ||2174 scan->mport_id == RIO_MPORT_ANY) {2175 port->nscan = scan->ops;2176 if (port->id == scan->mport_id)2177 break;2178 }2179 }2180 2181 list_add_tail(&port->node, &rio_mports);2182 mutex_unlock(&rio_mport_list_lock);2183 2184 dev_set_name(&port->dev, "rapidio%d", port->id);2185 port->dev.class = &rio_mport_class;2186 atomic_set(&port->state, RIO_DEVICE_RUNNING);2187 2188 res = device_register(&port->dev);2189 if (res) {2190 dev_err(&port->dev, "RIO: mport%d registration failed ERR=%d\n",2191 port->id, res);2192 mutex_lock(&rio_mport_list_lock);2193 list_del(&port->node);2194 mutex_unlock(&rio_mport_list_lock);2195 put_device(&port->dev);2196 } else {2197 dev_dbg(&port->dev, "RIO: registered mport%d\n", port->id);2198 }2199 2200 return res;2201}2202EXPORT_SYMBOL_GPL(rio_register_mport);2203 2204static int rio_mport_cleanup_callback(struct device *dev, void *data)2205{2206 struct rio_dev *rdev = to_rio_dev(dev);2207 2208 if (dev->bus == &rio_bus_type)2209 rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);2210 return 0;2211}2212 2213static int rio_net_remove_children(struct rio_net *net)2214{2215 /*2216 * Unregister all RapidIO devices residing on this net (this will2217 * invoke notification of registered subsystem interfaces as well).2218 */2219 device_for_each_child(&net->dev, NULL, rio_mport_cleanup_callback);2220 return 0;2221}2222 2223int rio_unregister_mport(struct rio_mport *port)2224{2225 pr_debug("RIO: %s %s id=%d\n", __func__, port->name, port->id);2226 2227 /* Transition mport to the SHUTDOWN state */2228 if (atomic_cmpxchg(&port->state,2229 RIO_DEVICE_RUNNING,2230 RIO_DEVICE_SHUTDOWN) != RIO_DEVICE_RUNNING) {2231 pr_err("RIO: %s unexpected state transition for mport %s\n",2232 __func__, port->name);2233 }2234 2235 if (port->net && port->net->hport == port) {2236 rio_net_remove_children(port->net);2237 rio_free_net(port->net);2238 }2239 2240 /*2241 * Unregister all RapidIO devices attached to this mport (this will2242 * invoke notification of registered subsystem interfaces as well).2243 */2244 mutex_lock(&rio_mport_list_lock);2245 list_del(&port->node);2246 mutex_unlock(&rio_mport_list_lock);2247 device_unregister(&port->dev);2248 2249 return 0;2250}2251EXPORT_SYMBOL_GPL(rio_unregister_mport);2252