drivers/scsi/isci/phy.h

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55 #ifndef _ISCI_PHY_H_
  56 #define _ISCI_PHY_H_
  57
  58 #include <scsi/sas.h>
  59 #include <scsi/libsas.h>
  60 #include "state_machine.h"
  61 #include "sas.h"
  62
  63 /* This is the timeout value for the SATA phy to wait for a SIGNATURE FIS
  64  * before restarting the starting state machine.  Technically, the old parallel
  65  * ATA specification required up to 30 seconds for a device to issue its
  66  * signature FIS as a result of a soft reset.  Now we see that devices respond
  67  * generally within 15 seconds, but we'll use 25 for now.
  68  */
  69 #define SCIC_SDS_SIGNATURE_FIS_TIMEOUT    25000
  70
  71 /* This is the timeout for the SATA OOB/SN because the hardware does not
  72  * recognize a hot plug after OOB signal but before the SN signals.  We need to
  73  * make sure after a hotplug timeout if we have not received the speed event
  74  * notification from the hardware that we restart the hardware OOB state
  75  * machine.
  76  */
  77 #define SCIC_SDS_SATA_LINK_TRAINING_TIMEOUT  250
  78
  79 enum scic_sds_phy_protocol {
  80         SCIC_SDS_PHY_PROTOCOL_UNKNOWN,
  81         SCIC_SDS_PHY_PROTOCOL_SAS,
  82         SCIC_SDS_PHY_PROTOCOL_SATA,
  83         SCIC_SDS_MAX_PHY_PROTOCOLS
  84 };
  85
  86 /**
  87  * struct scic_sds_phy - This structure  contains or references all of the data
  88  *    necessary to represent the core phy object and SCU harware protocol
  89  *    engine.
  90  *
  91  *
  92  */
  93 struct scic_sds_phy {
  94         /**
  95          * This field contains the information for the base phy state machine.
  96          */
  97         struct sci_base_state_machine state_machine;
  98
  99         /**
 100          * This field specifies the port object that owns/contains this phy.
 101          */
 102         struct scic_sds_port *owning_port;
 103
 104         /**
 105          * This field indicates whether the phy supports 1.5 Gb/s, 3.0 Gb/s,
 106          * or 6.0 Gb/s operation.
 107          */
 108         enum sas_linkrate max_negotiated_speed;
 109
 110         /**
 111          * This member specifies the protocol being utilized on this phy.  This
 112          * field contains a legitamite value once the PHY has link trained with
 113          * a remote phy.
 114          */
 115         enum scic_sds_phy_protocol protocol;
 116
 117         /**
 118          * This field specifies the index with which this phy is associated (0-3).
 119          */
 120         u8 phy_index;
 121
 122         /**
 123          * This member indicates if this particular PHY has received a BCN while
 124          * it had no port assignement.  This BCN will be reported once the phy is
 125          * assigned to a port.
 126          */
 127         bool bcn_received_while_port_unassigned;
 128
 129         /**
 130          * This field indicates if this PHY is currently in the process of
 131          * link training (i.e. it has started OOB, but has yet to perform
 132          * IAF exchange/Signature FIS reception).
 133          */
 134         bool is_in_link_training;
 135
 136         /**
 137          * This field contains a reference to the timer utilized in detecting
 138          * when a signature FIS timeout has occurred.  The signature FIS is the
 139          * first FIS sent by an attached SATA device after OOB/SN.
 140          */
 141         void *sata_timeout_timer;
 142
 143         const struct scic_sds_phy_state_handler *state_handlers;
 144
 145         struct sci_base_state_machine starting_substate_machine;
 146
 147         /**
 148          * This field is the pointer to the transport layer register for the SCU
 149          * hardware.
 150          */
 151         struct scu_transport_layer_registers __iomem *transport_layer_registers;
 152
 153         /**
 154          * This field points to the link layer register set within the SCU.
 155          */
 156         struct scu_link_layer_registers __iomem *link_layer_registers;
 157
 158 };
 159
 160
 161 struct isci_phy {
 162         struct scic_sds_phy sci;
 163         struct asd_sas_phy sas_phy;
 164         struct isci_port *isci_port;
 165         u8 sas_addr[SAS_ADDR_SIZE];
 166
 167         union {
 168                 struct sas_identify_frame iaf;
 169                 struct dev_to_host_fis fis;
 170         } frame_rcvd;
 171 };
 172
 173 static inline struct isci_phy *to_isci_phy(struct asd_sas_phy *sas_phy)
 174 {
 175         struct isci_phy *iphy = container_of(sas_phy, typeof(*iphy), sas_phy);
 176
 177         return iphy;
 178 }
 179
 180 static inline struct isci_phy *sci_phy_to_iphy(struct scic_sds_phy *sci_phy)
 181 {
 182         struct isci_phy *iphy = container_of(sci_phy, typeof(*iphy), sci);
 183
 184         return iphy;
 185 }
 186
 187 struct scic_phy_cap {
 188         union {
 189                 struct {
 190                         /*
 191                          * The SAS specification indicates the start bit shall
 192                          * always be set to
 193                          * 1.  This implementation will have the start bit set
 194                          * to 0 if the PHY CAPABILITIES were either not
 195                          * received or speed negotiation failed.
 196                          */
 197                         u8 start:1;
 198                         u8 tx_ssc_type:1;
 199                         u8 res1:2;
 200                         u8 req_logical_linkrate:4;
 201
 202                         u32 gen1_no_ssc:1;
 203                         u32 gen1_ssc:1;
 204                         u32 gen2_no_ssc:1;
 205                         u32 gen2_ssc:1;
 206                         u32 gen3_no_ssc:1;
 207                         u32 gen3_ssc:1;
 208                         u32 res2:17;
 209                         u32 parity:1;
 210                 };
 211                 u32 all;
 212         };
 213 }  __packed;
 214
 215 /* this data structure reflects the link layer transmit identification reg */
 216 struct scic_phy_proto {
 217         union {
 218                 struct {
 219                         u16 _r_a:1;
 220                         u16 smp_iport:1;
 221                         u16 stp_iport:1;
 222                         u16 ssp_iport:1;
 223                         u16 _r_b:4;
 224                         u16 _r_c:1;
 225                         u16 smp_tport:1;
 226                         u16 stp_tport:1;
 227                         u16 ssp_tport:1;
 228                         u16 _r_d:4;
 229                 };
 230                 u16 all;
 231         };
 232 } __packed;
 233
 234
 235 /**
 236  * struct scic_phy_properties - This structure defines the properties common to
 237  *    all phys that can be retrieved.
 238  *
 239  *
 240  */
 241 struct scic_phy_properties {
 242         /**
 243          * This field specifies the port that currently contains the
 244          * supplied phy.  This field may be set to NULL
 245          * if the phy is not currently contained in a port.
 246          */
 247         struct scic_sds_port *owning_port;
 248
 249         /**
 250          * This field specifies the link rate at which the phy is
 251          * currently operating.
 252          */
 253         enum sas_linkrate negotiated_link_rate;
 254
 255         /**
 256          * This field specifies the index of the phy in relation to other
 257          * phys within the controller.  This index is zero relative.
 258          */
 259         u8 index;
 260 };
 261
 262 /**
 263  * struct scic_sas_phy_properties - This structure defines the properties,
 264  *    specific to a SAS phy, that can be retrieved.
 265  *
 266  *
 267  */
 268 struct scic_sas_phy_properties {
 269         /**
 270          * This field delineates the Identify Address Frame received
 271          * from the remote end point.
 272          */
 273         struct sas_identify_frame rcvd_iaf;
 274
 275         /**
 276          * This field delineates the Phy capabilities structure received
 277          * from the remote end point.
 278          */
 279         struct scic_phy_cap rcvd_cap;
 280
 281 };
 282
 283 /**
 284  * struct scic_sata_phy_properties - This structure defines the properties,
 285  *    specific to a SATA phy, that can be retrieved.
 286  *
 287  *
 288  */
 289 struct scic_sata_phy_properties {
 290         /**
 291          * This field delineates the signature FIS received from the
 292          * attached target.
 293          */
 294         struct dev_to_host_fis signature_fis;
 295
 296         /**
 297          * This field specifies to the user if a port selector is connected
 298          * on the specified phy.
 299          */
 300         bool is_port_selector_present;
 301
 302 };
 303
 304 /**
 305  * enum scic_phy_counter_id - This enumeration depicts the various pieces of
 306  *    optional information that can be retrieved for a specific phy.
 307  *
 308  *
 309  */
 310 enum scic_phy_counter_id {
 311         /**
 312          * This PHY information field tracks the number of frames received.
 313          */
 314         SCIC_PHY_COUNTER_RECEIVED_FRAME,
 315
 316         /**
 317          * This PHY information field tracks the number of frames transmitted.
 318          */
 319         SCIC_PHY_COUNTER_TRANSMITTED_FRAME,
 320
 321         /**
 322          * This PHY information field tracks the number of DWORDs received.
 323          */
 324         SCIC_PHY_COUNTER_RECEIVED_FRAME_WORD,
 325
 326         /**
 327          * This PHY information field tracks the number of DWORDs transmitted.
 328          */
 329         SCIC_PHY_COUNTER_TRANSMITTED_FRAME_DWORD,
 330
 331         /**
 332          * This PHY information field tracks the number of times DWORD
 333          * synchronization was lost.
 334          */
 335         SCIC_PHY_COUNTER_LOSS_OF_SYNC_ERROR,
 336
 337         /**
 338          * This PHY information field tracks the number of received DWORDs with
 339          * running disparity errors.
 340          */
 341         SCIC_PHY_COUNTER_RECEIVED_DISPARITY_ERROR,
 342
 343         /**
 344          * This PHY information field tracks the number of received frames with a
 345          * CRC error (not including short or truncated frames).
 346          */
 347         SCIC_PHY_COUNTER_RECEIVED_FRAME_CRC_ERROR,
 348
 349         /**
 350          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 351          * primitives received.
 352          */
 353         SCIC_PHY_COUNTER_RECEIVED_DONE_ACK_NAK_TIMEOUT,
 354
 355         /**
 356          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 357          * primitives transmitted.
 358          */
 359         SCIC_PHY_COUNTER_TRANSMITTED_DONE_ACK_NAK_TIMEOUT,
 360
 361         /**
 362          * This PHY information field tracks the number of times the inactivity
 363          * timer for connections on the phy has been utilized.
 364          */
 365         SCIC_PHY_COUNTER_INACTIVITY_TIMER_EXPIRED,
 366
 367         /**
 368          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 369          * primitives received.
 370          */
 371         SCIC_PHY_COUNTER_RECEIVED_DONE_CREDIT_TIMEOUT,
 372
 373         /**
 374          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 375          * primitives transmitted.
 376          */
 377         SCIC_PHY_COUNTER_TRANSMITTED_DONE_CREDIT_TIMEOUT,
 378
 379         /**
 380          * This PHY information field tracks the number of CREDIT BLOCKED
 381          * primitives received.
 382          * @note Depending on remote device implementation, credit blocks
 383          *       may occur regularly.
 384          */
 385         SCIC_PHY_COUNTER_RECEIVED_CREDIT_BLOCKED,
 386
 387         /**
 388          * This PHY information field contains the number of short frames
 389          * received.  A short frame is simply a frame smaller then what is
 390          * allowed by either the SAS or SATA specification.
 391          */
 392         SCIC_PHY_COUNTER_RECEIVED_SHORT_FRAME,
 393
 394         /**
 395          * This PHY information field contains the number of frames received after
 396          * credit has been exhausted.
 397          */
 398         SCIC_PHY_COUNTER_RECEIVED_FRAME_WITHOUT_CREDIT,
 399
 400         /**
 401          * This PHY information field contains the number of frames received after
 402          * a DONE has been received.
 403          */
 404         SCIC_PHY_COUNTER_RECEIVED_FRAME_AFTER_DONE,
 405
 406         /**
 407          * This PHY information field contains the number of times the phy
 408          * failed to achieve DWORD synchronization during speed negotiation.
 409          */
 410         SCIC_PHY_COUNTER_SN_DWORD_SYNC_ERROR
 411 };
 412
 413 enum scic_sds_phy_states {
 414         /**
 415          * Simply the initial state for the base domain state machine.
 416          */
 417         SCI_BASE_PHY_STATE_INITIAL,
 418
 419         /**
 420          * This state indicates that the phy has successfully been stopped.
 421          * In this state no new IO operations are permitted on this phy.
 422          * This state is entered from the INITIAL state.
 423          * This state is entered from the STARTING state.
 424          * This state is entered from the READY state.
 425          * This state is entered from the RESETTING state.
 426          */
 427         SCI_BASE_PHY_STATE_STOPPED,
 428
 429         /**
 430          * This state indicates that the phy is in the process of becomming
 431          * ready.  In this state no new IO operations are permitted on this phy.
 432          * This state is entered from the STOPPED state.
 433          * This state is entered from the READY state.
 434          * This state is entered from the RESETTING state.
 435          */
 436         SCI_BASE_PHY_STATE_STARTING,
 437
 438         /**
 439          * This state indicates the the phy is now ready.  Thus, the user
 440          * is able to perform IO operations utilizing this phy as long as it
 441          * is currently part of a valid port.
 442          * This state is entered from the STARTING state.
 443          */
 444         SCI_BASE_PHY_STATE_READY,
 445
 446         /**
 447          * This state indicates that the phy is in the process of being reset.
 448          * In this state no new IO operations are permitted on this phy.
 449          * This state is entered from the READY state.
 450          */
 451         SCI_BASE_PHY_STATE_RESETTING,
 452
 453         /**
 454          * Simply the final state for the base phy state machine.
 455          */
 456         SCI_BASE_PHY_STATE_FINAL,
 457 };
 458
 459
 460 /**
 461  * enum scic_sds_phy_starting_substates -
 462  *
 463  *
 464  */
 465 enum scic_sds_phy_starting_substates {
 466         /**
 467          * Initial state
 468          */
 469         SCIC_SDS_PHY_STARTING_SUBSTATE_INITIAL,
 470
 471         /**
 472          * Wait state for the hardware OSSP event type notification
 473          */
 474         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_OSSP_EN,
 475
 476         /**
 477          * Wait state for the PHY speed notification
 478          */
 479         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_SPEED_EN,
 480
 481         /**
 482          * Wait state for the IAF Unsolicited frame notification
 483          */
 484         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_IAF_UF,
 485
 486         /**
 487          * Wait state for the request to consume power
 488          */
 489         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_POWER,
 490
 491         /**
 492          * Wait state for request to consume power
 493          */
 494         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_POWER,
 495
 496         /**
 497          * Wait state for the SATA PHY notification
 498          */
 499         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_PHY_EN,
 500
 501         /**
 502          * Wait for the SATA PHY speed notification
 503          */
 504         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_SPEED_EN,
 505
 506         /**
 507          * Wait state for the SIGNATURE FIS unsolicited frame notification
 508          */
 509         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SIG_FIS_UF,
 510
 511         /**
 512          * Exit state for this state machine
 513          */
 514         SCIC_SDS_PHY_STARTING_SUBSTATE_FINAL,
 515 };
 516
 517
 518
 519 typedef enum sci_status (*scic_sds_phy_handler_t)(struct scic_sds_phy *);
 520 typedef enum sci_status (*scic_sds_phy_event_handler_t)(struct scic_sds_phy *, u32);
 521 typedef enum sci_status (*scic_sds_phy_frame_handler_t)(struct scic_sds_phy *, u32);
 522 typedef enum sci_status (*scic_sds_phy_power_handler_t)(struct scic_sds_phy *);
 523
 524 struct scic_sds_phy_state_handler {
 525         /**
 526          * The start_handler specifies the method invoked when there is an
 527          * attempt to start a phy.
 528          */
 529         scic_sds_phy_handler_t start_handler;
 530
 531         /**
 532          * The stop_handler specifies the method invoked when there is an
 533          * attempt to stop a phy.
 534          */
 535         scic_sds_phy_handler_t stop_handler;
 536
 537         /**
 538          * The reset_handler specifies the method invoked when there is an
 539          * attempt to reset a phy.
 540          */
 541         scic_sds_phy_handler_t reset_handler;
 542
 543         /**
 544          * The destruct_handler specifies the method invoked when attempting to
 545          * destruct a phy.
 546          */
 547         scic_sds_phy_handler_t destruct_handler;
 548
 549         /**
 550          * The state handler for unsolicited frames received from the SCU hardware.
 551          */
 552         scic_sds_phy_frame_handler_t frame_handler;
 553
 554         /**
 555          * The state handler for events received from the SCU hardware.
 556          */
 557         scic_sds_phy_event_handler_t event_handler;
 558
 559         /**
 560          * The state handler for staggered spinup.
 561          */
 562         scic_sds_phy_power_handler_t consume_power_handler;
 563
 564 };
 565
 566 /**
 567  * scic_sds_phy_get_index() -
 568  *
 569  * This macro returns the phy index for the specified phy
 570  */
 571 #define scic_sds_phy_get_index(phy) \
 572         ((phy)->phy_index)
 573
 574 /**
 575  * scic_sds_phy_get_controller() - This macro returns the controller for this
 576  *    phy
 577  *
 578  *
 579  */
 580 #define scic_sds_phy_get_controller(phy) \
 581         (scic_sds_port_get_controller((phy)->owning_port))
 582
 583 /**
 584  * scic_sds_phy_set_state_handlers() - This macro sets the state handlers for
 585  *    this phy object
 586  *
 587  *
 588  */
 589 #define scic_sds_phy_set_state_handlers(phy, handlers) \
 590         ((phy)->state_handlers = (handlers))
 591
 592 /**
 593  * scic_sds_phy_set_base_state_handlers() -
 594  *
 595  * This macro set the base state handlers for the phy object.
 596  */
 597 #define scic_sds_phy_set_base_state_handlers(phy, state_id) \
 598         scic_sds_phy_set_state_handlers(\
 599                 (phy), \
 600                 &scic_sds_phy_state_handler_table[(state_id)] \
 601                 )
 602
 603 void scic_sds_phy_construct(
 604         struct scic_sds_phy *this_phy,
 605         struct scic_sds_port *owning_port,
 606         u8 phy_index);
 607
 608 struct scic_sds_port *scic_sds_phy_get_port(
 609         struct scic_sds_phy *this_phy);
 610
 611 void scic_sds_phy_set_port(
 612         struct scic_sds_phy *this_phy,
 613         struct scic_sds_port *owning_port);
 614
 615 enum sci_status scic_sds_phy_initialize(
 616         struct scic_sds_phy *this_phy,
 617         struct scu_transport_layer_registers __iomem *transport_layer_registers,
 618         struct scu_link_layer_registers __iomem *link_layer_registers);
 619
 620 enum sci_status scic_sds_phy_start(
 621         struct scic_sds_phy *this_phy);
 622
 623 enum sci_status scic_sds_phy_stop(
 624         struct scic_sds_phy *this_phy);
 625
 626 enum sci_status scic_sds_phy_reset(
 627         struct scic_sds_phy *this_phy);
 628
 629 void scic_sds_phy_resume(
 630         struct scic_sds_phy *this_phy);
 631
 632 void scic_sds_phy_setup_transport(
 633         struct scic_sds_phy *this_phy,
 634         u32 device_id);
 635
 636 enum sci_status scic_sds_phy_event_handler(
 637         struct scic_sds_phy *this_phy,
 638         u32 event_code);
 639
 640 enum sci_status scic_sds_phy_frame_handler(
 641         struct scic_sds_phy *this_phy,
 642         u32 frame_index);
 643
 644 enum sci_status scic_sds_phy_consume_power_handler(
 645         struct scic_sds_phy *this_phy);
 646
 647 void scic_sds_phy_get_sas_address(
 648         struct scic_sds_phy *this_phy,
 649         struct sci_sas_address *sas_address);
 650
 651 void scic_sds_phy_get_attached_sas_address(
 652         struct scic_sds_phy *this_phy,
 653         struct sci_sas_address *sas_address);
 654
 655 struct scic_phy_proto;
 656 void scic_sds_phy_get_protocols(
 657         struct scic_sds_phy *sci_phy,
 658         struct scic_phy_proto *protocols);
 659 enum sas_linkrate sci_phy_linkrate(struct scic_sds_phy *sci_phy);
 660
 661 struct isci_host;
 662 void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index);
 663 int isci_phy_control(struct asd_sas_phy *phy, enum phy_func func, void *buf);
 664
 665 #endif /* !defined(_ISCI_PHY_H_) */