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         /**
 146          * This field is the pointer to the transport layer register for the SCU
 147          * hardware.
 148          */
 149         struct scu_transport_layer_registers __iomem *transport_layer_registers;
 150
 151         /**
 152          * This field points to the link layer register set within the SCU.
 153          */
 154         struct scu_link_layer_registers __iomem *link_layer_registers;
 155
 156 };
 157
 158
 159 struct isci_phy {
 160         struct scic_sds_phy sci;
 161         struct asd_sas_phy sas_phy;
 162         struct isci_port *isci_port;
 163         u8 sas_addr[SAS_ADDR_SIZE];
 164
 165         union {
 166                 struct sas_identify_frame iaf;
 167                 struct dev_to_host_fis fis;
 168         } frame_rcvd;
 169 };
 170
 171 static inline struct isci_phy *to_isci_phy(struct asd_sas_phy *sas_phy)
 172 {
 173         struct isci_phy *iphy = container_of(sas_phy, typeof(*iphy), sas_phy);
 174
 175         return iphy;
 176 }
 177
 178 static inline struct isci_phy *sci_phy_to_iphy(struct scic_sds_phy *sci_phy)
 179 {
 180         struct isci_phy *iphy = container_of(sci_phy, typeof(*iphy), sci);
 181
 182         return iphy;
 183 }
 184
 185 struct scic_phy_cap {
 186         union {
 187                 struct {
 188                         /*
 189                          * The SAS specification indicates the start bit shall
 190                          * always be set to
 191                          * 1.  This implementation will have the start bit set
 192                          * to 0 if the PHY CAPABILITIES were either not
 193                          * received or speed negotiation failed.
 194                          */
 195                         u8 start:1;
 196                         u8 tx_ssc_type:1;
 197                         u8 res1:2;
 198                         u8 req_logical_linkrate:4;
 199
 200                         u32 gen1_no_ssc:1;
 201                         u32 gen1_ssc:1;
 202                         u32 gen2_no_ssc:1;
 203                         u32 gen2_ssc:1;
 204                         u32 gen3_no_ssc:1;
 205                         u32 gen3_ssc:1;
 206                         u32 res2:17;
 207                         u32 parity:1;
 208                 };
 209                 u32 all;
 210         };
 211 }  __packed;
 212
 213 /* this data structure reflects the link layer transmit identification reg */
 214 struct scic_phy_proto {
 215         union {
 216                 struct {
 217                         u16 _r_a:1;
 218                         u16 smp_iport:1;
 219                         u16 stp_iport:1;
 220                         u16 ssp_iport:1;
 221                         u16 _r_b:4;
 222                         u16 _r_c:1;
 223                         u16 smp_tport:1;
 224                         u16 stp_tport:1;
 225                         u16 ssp_tport:1;
 226                         u16 _r_d:4;
 227                 };
 228                 u16 all;
 229         };
 230 } __packed;
 231
 232
 233 /**
 234  * struct scic_phy_properties - This structure defines the properties common to
 235  *    all phys that can be retrieved.
 236  *
 237  *
 238  */
 239 struct scic_phy_properties {
 240         /**
 241          * This field specifies the port that currently contains the
 242          * supplied phy.  This field may be set to NULL
 243          * if the phy is not currently contained in a port.
 244          */
 245         struct scic_sds_port *owning_port;
 246
 247         /**
 248          * This field specifies the link rate at which the phy is
 249          * currently operating.
 250          */
 251         enum sas_linkrate negotiated_link_rate;
 252
 253         /**
 254          * This field specifies the index of the phy in relation to other
 255          * phys within the controller.  This index is zero relative.
 256          */
 257         u8 index;
 258 };
 259
 260 /**
 261  * struct scic_sas_phy_properties - This structure defines the properties,
 262  *    specific to a SAS phy, that can be retrieved.
 263  *
 264  *
 265  */
 266 struct scic_sas_phy_properties {
 267         /**
 268          * This field delineates the Identify Address Frame received
 269          * from the remote end point.
 270          */
 271         struct sas_identify_frame rcvd_iaf;
 272
 273         /**
 274          * This field delineates the Phy capabilities structure received
 275          * from the remote end point.
 276          */
 277         struct scic_phy_cap rcvd_cap;
 278
 279 };
 280
 281 /**
 282  * struct scic_sata_phy_properties - This structure defines the properties,
 283  *    specific to a SATA phy, that can be retrieved.
 284  *
 285  *
 286  */
 287 struct scic_sata_phy_properties {
 288         /**
 289          * This field delineates the signature FIS received from the
 290          * attached target.
 291          */
 292         struct dev_to_host_fis signature_fis;
 293
 294         /**
 295          * This field specifies to the user if a port selector is connected
 296          * on the specified phy.
 297          */
 298         bool is_port_selector_present;
 299
 300 };
 301
 302 /**
 303  * enum scic_phy_counter_id - This enumeration depicts the various pieces of
 304  *    optional information that can be retrieved for a specific phy.
 305  *
 306  *
 307  */
 308 enum scic_phy_counter_id {
 309         /**
 310          * This PHY information field tracks the number of frames received.
 311          */
 312         SCIC_PHY_COUNTER_RECEIVED_FRAME,
 313
 314         /**
 315          * This PHY information field tracks the number of frames transmitted.
 316          */
 317         SCIC_PHY_COUNTER_TRANSMITTED_FRAME,
 318
 319         /**
 320          * This PHY information field tracks the number of DWORDs received.
 321          */
 322         SCIC_PHY_COUNTER_RECEIVED_FRAME_WORD,
 323
 324         /**
 325          * This PHY information field tracks the number of DWORDs transmitted.
 326          */
 327         SCIC_PHY_COUNTER_TRANSMITTED_FRAME_DWORD,
 328
 329         /**
 330          * This PHY information field tracks the number of times DWORD
 331          * synchronization was lost.
 332          */
 333         SCIC_PHY_COUNTER_LOSS_OF_SYNC_ERROR,
 334
 335         /**
 336          * This PHY information field tracks the number of received DWORDs with
 337          * running disparity errors.
 338          */
 339         SCIC_PHY_COUNTER_RECEIVED_DISPARITY_ERROR,
 340
 341         /**
 342          * This PHY information field tracks the number of received frames with a
 343          * CRC error (not including short or truncated frames).
 344          */
 345         SCIC_PHY_COUNTER_RECEIVED_FRAME_CRC_ERROR,
 346
 347         /**
 348          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 349          * primitives received.
 350          */
 351         SCIC_PHY_COUNTER_RECEIVED_DONE_ACK_NAK_TIMEOUT,
 352
 353         /**
 354          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 355          * primitives transmitted.
 356          */
 357         SCIC_PHY_COUNTER_TRANSMITTED_DONE_ACK_NAK_TIMEOUT,
 358
 359         /**
 360          * This PHY information field tracks the number of times the inactivity
 361          * timer for connections on the phy has been utilized.
 362          */
 363         SCIC_PHY_COUNTER_INACTIVITY_TIMER_EXPIRED,
 364
 365         /**
 366          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 367          * primitives received.
 368          */
 369         SCIC_PHY_COUNTER_RECEIVED_DONE_CREDIT_TIMEOUT,
 370
 371         /**
 372          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 373          * primitives transmitted.
 374          */
 375         SCIC_PHY_COUNTER_TRANSMITTED_DONE_CREDIT_TIMEOUT,
 376
 377         /**
 378          * This PHY information field tracks the number of CREDIT BLOCKED
 379          * primitives received.
 380          * @note Depending on remote device implementation, credit blocks
 381          *       may occur regularly.
 382          */
 383         SCIC_PHY_COUNTER_RECEIVED_CREDIT_BLOCKED,
 384
 385         /**
 386          * This PHY information field contains the number of short frames
 387          * received.  A short frame is simply a frame smaller then what is
 388          * allowed by either the SAS or SATA specification.
 389          */
 390         SCIC_PHY_COUNTER_RECEIVED_SHORT_FRAME,
 391
 392         /**
 393          * This PHY information field contains the number of frames received after
 394          * credit has been exhausted.
 395          */
 396         SCIC_PHY_COUNTER_RECEIVED_FRAME_WITHOUT_CREDIT,
 397
 398         /**
 399          * This PHY information field contains the number of frames received after
 400          * a DONE has been received.
 401          */
 402         SCIC_PHY_COUNTER_RECEIVED_FRAME_AFTER_DONE,
 403
 404         /**
 405          * This PHY information field contains the number of times the phy
 406          * failed to achieve DWORD synchronization during speed negotiation.
 407          */
 408         SCIC_PHY_COUNTER_SN_DWORD_SYNC_ERROR
 409 };
 410
 411 enum scic_sds_phy_states {
 412         /**
 413          * Simply the initial state for the base domain state machine.
 414          */
 415         SCI_BASE_PHY_STATE_INITIAL,
 416
 417         /**
 418          * This state indicates that the phy has successfully been stopped.
 419          * In this state no new IO operations are permitted on this phy.
 420          * This state is entered from the INITIAL state.
 421          * This state is entered from the STARTING state.
 422          * This state is entered from the READY state.
 423          * This state is entered from the RESETTING state.
 424          */
 425         SCI_BASE_PHY_STATE_STOPPED,
 426
 427         /**
 428          * This state indicates that the phy is in the process of becomming
 429          * ready.  In this state no new IO operations are permitted on this phy.
 430          * This state is entered from the STOPPED state.
 431          * This state is entered from the READY state.
 432          * This state is entered from the RESETTING state.
 433          */
 434         SCI_BASE_PHY_STATE_STARTING,
 435
 436         /**
 437          * Initial state
 438          */
 439         SCIC_SDS_PHY_STARTING_SUBSTATE_INITIAL,
 440
 441         /**
 442          * Wait state for the hardware OSSP event type notification
 443          */
 444         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_OSSP_EN,
 445
 446         /**
 447          * Wait state for the PHY speed notification
 448          */
 449         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_SPEED_EN,
 450
 451         /**
 452          * Wait state for the IAF Unsolicited frame notification
 453          */
 454         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_IAF_UF,
 455
 456         /**
 457          * Wait state for the request to consume power
 458          */
 459         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_POWER,
 460
 461         /**
 462          * Wait state for request to consume power
 463          */
 464         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_POWER,
 465
 466         /**
 467          * Wait state for the SATA PHY notification
 468          */
 469         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_PHY_EN,
 470
 471         /**
 472          * Wait for the SATA PHY speed notification
 473          */
 474         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_SPEED_EN,
 475
 476         /**
 477          * Wait state for the SIGNATURE FIS unsolicited frame notification
 478          */
 479         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SIG_FIS_UF,
 480
 481         /**
 482          * Exit state for this state machine
 483          */
 484         SCIC_SDS_PHY_STARTING_SUBSTATE_FINAL,
 485
 486         /**
 487          * This state indicates the the phy is now ready.  Thus, the user
 488          * is able to perform IO operations utilizing this phy as long as it
 489          * is currently part of a valid port.
 490          * This state is entered from the STARTING state.
 491          */
 492         SCI_BASE_PHY_STATE_READY,
 493
 494         /**
 495          * This state indicates that the phy is in the process of being reset.
 496          * In this state no new IO operations are permitted on this phy.
 497          * This state is entered from the READY state.
 498          */
 499         SCI_BASE_PHY_STATE_RESETTING,
 500
 501         /**
 502          * Simply the final state for the base phy state machine.
 503          */
 504         SCI_BASE_PHY_STATE_FINAL,
 505 };
 506
 507
 508 typedef enum sci_status (*scic_sds_phy_handler_t)(struct scic_sds_phy *);
 509 typedef enum sci_status (*scic_sds_phy_event_handler_t)(struct scic_sds_phy *, u32);
 510 typedef enum sci_status (*scic_sds_phy_frame_handler_t)(struct scic_sds_phy *, u32);
 511 typedef enum sci_status (*scic_sds_phy_power_handler_t)(struct scic_sds_phy *);
 512
 513 struct scic_sds_phy_state_handler {
 514         /**
 515          * The destruct_handler specifies the method invoked when attempting to
 516          * destruct a phy.
 517          */
 518         scic_sds_phy_handler_t destruct_handler;
 519
 520         /**
 521          * The state handler for unsolicited frames received from the SCU hardware.
 522          */
 523         scic_sds_phy_frame_handler_t frame_handler;
 524
 525         /**
 526          * The state handler for events received from the SCU hardware.
 527          */
 528         scic_sds_phy_event_handler_t event_handler;
 529
 530         /**
 531          * The state handler for staggered spinup.
 532          */
 533         scic_sds_phy_power_handler_t consume_power_handler;
 534
 535 };
 536
 537 /**
 538  * scic_sds_phy_get_index() -
 539  *
 540  * This macro returns the phy index for the specified phy
 541  */
 542 #define scic_sds_phy_get_index(phy) \
 543         ((phy)->phy_index)
 544
 545 /**
 546  * scic_sds_phy_get_controller() - This macro returns the controller for this
 547  *    phy
 548  *
 549  *
 550  */
 551 #define scic_sds_phy_get_controller(phy) \
 552         (scic_sds_port_get_controller((phy)->owning_port))
 553
 554 /**
 555  * scic_sds_phy_set_state_handlers() - This macro sets the state handlers for
 556  *    this phy object
 557  *
 558  *
 559  */
 560 #define scic_sds_phy_set_state_handlers(phy, handlers) \
 561         ((phy)->state_handlers = (handlers))
 562
 563 /**
 564  * scic_sds_phy_set_base_state_handlers() -
 565  *
 566  * This macro set the base state handlers for the phy object.
 567  */
 568 #define scic_sds_phy_set_base_state_handlers(phy, state_id) \
 569         scic_sds_phy_set_state_handlers(\
 570                 (phy), \
 571                 &scic_sds_phy_state_handler_table[(state_id)] \
 572                 )
 573
 574 void scic_sds_phy_construct(
 575         struct scic_sds_phy *this_phy,
 576         struct scic_sds_port *owning_port,
 577         u8 phy_index);
 578
 579 struct scic_sds_port *scic_sds_phy_get_port(
 580         struct scic_sds_phy *this_phy);
 581
 582 void scic_sds_phy_set_port(
 583         struct scic_sds_phy *this_phy,
 584         struct scic_sds_port *owning_port);
 585
 586 enum sci_status scic_sds_phy_initialize(
 587         struct scic_sds_phy *this_phy,
 588         struct scu_transport_layer_registers __iomem *transport_layer_registers,
 589         struct scu_link_layer_registers __iomem *link_layer_registers);
 590
 591 enum sci_status scic_sds_phy_start(
 592         struct scic_sds_phy *this_phy);
 593
 594 enum sci_status scic_sds_phy_stop(
 595         struct scic_sds_phy *this_phy);
 596
 597 enum sci_status scic_sds_phy_reset(
 598         struct scic_sds_phy *this_phy);
 599
 600 void scic_sds_phy_resume(
 601         struct scic_sds_phy *this_phy);
 602
 603 void scic_sds_phy_setup_transport(
 604         struct scic_sds_phy *this_phy,
 605         u32 device_id);
 606
 607 enum sci_status scic_sds_phy_event_handler(
 608         struct scic_sds_phy *this_phy,
 609         u32 event_code);
 610
 611 enum sci_status scic_sds_phy_frame_handler(
 612         struct scic_sds_phy *this_phy,
 613         u32 frame_index);
 614
 615 enum sci_status scic_sds_phy_consume_power_handler(
 616         struct scic_sds_phy *this_phy);
 617
 618 void scic_sds_phy_get_sas_address(
 619         struct scic_sds_phy *this_phy,
 620         struct sci_sas_address *sas_address);
 621
 622 void scic_sds_phy_get_attached_sas_address(
 623         struct scic_sds_phy *this_phy,
 624         struct sci_sas_address *sas_address);
 625
 626 struct scic_phy_proto;
 627 void scic_sds_phy_get_protocols(
 628         struct scic_sds_phy *sci_phy,
 629         struct scic_phy_proto *protocols);
 630 enum sas_linkrate sci_phy_linkrate(struct scic_sds_phy *sci_phy);
 631
 632 struct isci_host;
 633 void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index);
 634 int isci_phy_control(struct asd_sas_phy *phy, enum phy_func func, void *buf);
 635
 636 #endif /* !defined(_ISCI_PHY_H_) */