drivers/scsi/isci/core/scic_sds_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
  56 #ifndef _SCIC_SDS_PHY_H_
  57 #define _SCIC_SDS_PHY_H_
  58
  59 #include "intel_sas.h"
  60 #include "scu_registers.h"
  61 #include "sci_base_state_machine.h"
  62 #include <scsi/libsas.h>
  63
  64 struct scic_sds_port;
  65 /**
  66  *
  67  *
  68  * This is the timeout value for the SATA phy to wait for a SIGNATURE FIS
  69  * before restarting the starting state machine.  Technically, the old parallel
  70  * ATA specification required up to 30 seconds for a device to issue its
  71  * signature FIS as a result of a soft reset.  Now we see that devices respond
  72  * generally within 15 seconds, but we'll use 25 for now.
  73  */
  74 #define SCIC_SDS_SIGNATURE_FIS_TIMEOUT    25000
  75
  76 /**
  77  *
  78  *
  79  * This is the timeout for the SATA OOB/SN because the hardware does not
  80  * recognize a hot plug after OOB signal but before the SN signals.  We need to
  81  * make sure after a hotplug timeout if we have not received the speed event
  82  * notification from the hardware that we restart the hardware OOB state
  83  * machine.
  84  */
  85 #define SCIC_SDS_SATA_LINK_TRAINING_TIMEOUT  250
  86
  87 enum scic_sds_phy_states {
  88         /**
  89          * Simply the initial state for the base domain state machine.
  90          */
  91         SCI_BASE_PHY_STATE_INITIAL,
  92
  93         /**
  94          * This state indicates that the phy has successfully been stopped.
  95          * In this state no new IO operations are permitted on this phy.
  96          * This state is entered from the INITIAL state.
  97          * This state is entered from the STARTING state.
  98          * This state is entered from the READY state.
  99          * This state is entered from the RESETTING state.
 100          */
 101         SCI_BASE_PHY_STATE_STOPPED,
 102
 103         /**
 104          * This state indicates that the phy is in the process of becomming
 105          * ready.  In this state no new IO operations are permitted on this phy.
 106          * This state is entered from the STOPPED state.
 107          * This state is entered from the READY state.
 108          * This state is entered from the RESETTING state.
 109          */
 110         SCI_BASE_PHY_STATE_STARTING,
 111
 112         /**
 113          * This state indicates the the phy is now ready.  Thus, the user
 114          * is able to perform IO operations utilizing this phy as long as it
 115          * is currently part of a valid port.
 116          * This state is entered from the STARTING state.
 117          */
 118         SCI_BASE_PHY_STATE_READY,
 119
 120         /**
 121          * This state indicates that the phy is in the process of being reset.
 122          * In this state no new IO operations are permitted on this phy.
 123          * This state is entered from the READY state.
 124          */
 125         SCI_BASE_PHY_STATE_RESETTING,
 126
 127         /**
 128          * Simply the final state for the base phy state machine.
 129          */
 130         SCI_BASE_PHY_STATE_FINAL,
 131 };
 132
 133
 134 /**
 135  * enum scic_sds_phy_starting_substates -
 136  *
 137  *
 138  */
 139 enum scic_sds_phy_starting_substates {
 140         /**
 141          * Initial state
 142          */
 143         SCIC_SDS_PHY_STARTING_SUBSTATE_INITIAL,
 144
 145         /**
 146          * Wait state for the hardware OSSP event type notification
 147          */
 148         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_OSSP_EN,
 149
 150         /**
 151          * Wait state for the PHY speed notification
 152          */
 153         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_SPEED_EN,
 154
 155         /**
 156          * Wait state for the IAF Unsolicited frame notification
 157          */
 158         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_IAF_UF,
 159
 160         /**
 161          * Wait state for the request to consume power
 162          */
 163         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SAS_POWER,
 164
 165         /**
 166          * Wait state for request to consume power
 167          */
 168         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_POWER,
 169
 170         /**
 171          * Wait state for the SATA PHY notification
 172          */
 173         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_PHY_EN,
 174
 175         /**
 176          * Wait for the SATA PHY speed notification
 177          */
 178         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SATA_SPEED_EN,
 179
 180         /**
 181          * Wait state for the SIGNATURE FIS unsolicited frame notification
 182          */
 183         SCIC_SDS_PHY_STARTING_SUBSTATE_AWAIT_SIG_FIS_UF,
 184
 185         /**
 186          * Exit state for this state machine
 187          */
 188         SCIC_SDS_PHY_STARTING_SUBSTATE_FINAL,
 189 };
 190
 191 struct scic_sds_port;
 192 struct scic_sds_controller;
 193
 194 /**
 195  * This enumeration provides a named phy type for the state machine
 196  *
 197  *
 198  */
 199 enum scic_sds_phy_protocol {
 200         /**
 201          * This is an unknown phy type since there is either nothing on the other
 202          * end or we have not detected the phy type as yet.
 203          */
 204         SCIC_SDS_PHY_PROTOCOL_UNKNOWN,
 205
 206         /**
 207          * This is a SAS PHY
 208          */
 209         SCIC_SDS_PHY_PROTOCOL_SAS,
 210
 211         /**
 212          * This is a SATA PHY
 213          */
 214         SCIC_SDS_PHY_PROTOCOL_SATA,
 215
 216         SCIC_SDS_MAX_PHY_PROTOCOLS
 217 };
 218
 219 struct isci_phy;
 220 /**
 221  * struct scic_sds_phy - This structure  contains or references all of the data
 222  *    necessary to represent the core phy object and SCU harware protocol
 223  *    engine.
 224  *
 225  *
 226  */
 227 struct scic_sds_phy {
 228         /**
 229          * This field depicts the peer object for the phy.
 230          */
 231         struct isci_phy *iphy;
 232
 233         /**
 234          * This field contains the information for the base phy state machine.
 235          */
 236         struct sci_base_state_machine state_machine;
 237
 238         /**
 239          * This field specifies the port object that owns/contains this phy.
 240          */
 241         struct scic_sds_port *owning_port;
 242
 243         /**
 244          * This field indicates whether the phy supports 1.5 Gb/s, 3.0 Gb/s,
 245          * or 6.0 Gb/s operation.
 246          */
 247         enum sas_linkrate max_negotiated_speed;
 248
 249         /**
 250          * This member specifies the protocol being utilized on this phy.  This
 251          * field contains a legitamite value once the PHY has link trained with
 252          * a remote phy.
 253          */
 254         enum scic_sds_phy_protocol protocol;
 255
 256         /**
 257          * This field specifies the index with which this phy is associated (0-3).
 258          */
 259         u8 phy_index;
 260
 261         /**
 262          * This member indicates if this particular PHY has received a BCN while
 263          * it had no port assignement.  This BCN will be reported once the phy is
 264          * assigned to a port.
 265          */
 266         bool bcn_received_while_port_unassigned;
 267
 268         /**
 269          * This field indicates if this PHY is currently in the process of
 270          * link training (i.e. it has started OOB, but has yet to perform
 271          * IAF exchange/Signature FIS reception).
 272          */
 273         bool is_in_link_training;
 274
 275         union {
 276                 struct {
 277                         struct sas_identify_frame identify_address_frame_buffer;
 278
 279                 } sas;
 280
 281                 struct {
 282                         struct dev_to_host_fis signature_fis_buffer;
 283
 284                 } sata;
 285
 286         } phy_type;
 287
 288         /**
 289          * This field contains a reference to the timer utilized in detecting
 290          * when a signature FIS timeout has occurred.  The signature FIS is the
 291          * first FIS sent by an attached SATA device after OOB/SN.
 292          */
 293         void *sata_timeout_timer;
 294
 295         const struct scic_sds_phy_state_handler *state_handlers;
 296
 297         struct sci_base_state_machine starting_substate_machine;
 298
 299         /**
 300          * This field is the pointer to the transport layer register for the SCU
 301          * hardware.
 302          */
 303         struct scu_transport_layer_registers __iomem *transport_layer_registers;
 304
 305         /**
 306          * This field points to the link layer register set within the SCU.
 307          */
 308         struct scu_link_layer_registers __iomem *link_layer_registers;
 309
 310 };
 311
 312 typedef enum sci_status (*scic_sds_phy_handler_t)(struct scic_sds_phy *);
 313 typedef enum sci_status (*scic_sds_phy_event_handler_t)(struct scic_sds_phy *, u32);
 314 typedef enum sci_status (*scic_sds_phy_frame_handler_t)(struct scic_sds_phy *, u32);
 315 typedef enum sci_status (*scic_sds_phy_power_handler_t)(struct scic_sds_phy *);
 316
 317 /**
 318  * struct scic_sds_phy_state_handler -
 319  *
 320  *
 321  */
 322 struct scic_sds_phy_state_handler {
 323         /**
 324          * The start_handler specifies the method invoked when there is an
 325          * attempt to start a phy.
 326          */
 327         scic_sds_phy_handler_t start_handler;
 328
 329         /**
 330          * The stop_handler specifies the method invoked when there is an
 331          * attempt to stop a phy.
 332          */
 333         scic_sds_phy_handler_t stop_handler;
 334
 335         /**
 336          * The reset_handler specifies the method invoked when there is an
 337          * attempt to reset a phy.
 338          */
 339         scic_sds_phy_handler_t reset_handler;
 340
 341         /**
 342          * The destruct_handler specifies the method invoked when attempting to
 343          * destruct a phy.
 344          */
 345         scic_sds_phy_handler_t destruct_handler;
 346
 347         /**
 348          * The state handler for unsolicited frames received from the SCU hardware.
 349          */
 350         scic_sds_phy_frame_handler_t frame_handler;
 351
 352         /**
 353          * The state handler for events received from the SCU hardware.
 354          */
 355         scic_sds_phy_event_handler_t event_handler;
 356
 357         /**
 358          * The state handler for staggered spinup.
 359          */
 360         scic_sds_phy_power_handler_t consume_power_handler;
 361
 362 };
 363
 364 /**
 365  * scic_sds_phy_get_index() -
 366  *
 367  * This macro returns the phy index for the specified phy
 368  */
 369 #define scic_sds_phy_get_index(phy) \
 370         ((phy)->phy_index)
 371
 372 /**
 373  * scic_sds_phy_get_controller() - This macro returns the controller for this
 374  *    phy
 375  *
 376  *
 377  */
 378 #define scic_sds_phy_get_controller(phy) \
 379         (scic_sds_port_get_controller((phy)->owning_port))
 380
 381 /**
 382  * scic_sds_phy_set_state_handlers() - This macro sets the state handlers for
 383  *    this phy object
 384  *
 385  *
 386  */
 387 #define scic_sds_phy_set_state_handlers(phy, handlers) \
 388         ((phy)->state_handlers = (handlers))
 389
 390 /**
 391  * scic_sds_phy_set_base_state_handlers() -
 392  *
 393  * This macro set the base state handlers for the phy object.
 394  */
 395 #define scic_sds_phy_set_base_state_handlers(phy, state_id) \
 396         scic_sds_phy_set_state_handlers(\
 397                 (phy), \
 398                 &scic_sds_phy_state_handler_table[(state_id)] \
 399                 )
 400
 401 void scic_sds_phy_construct(
 402         struct scic_sds_phy *this_phy,
 403         struct scic_sds_port *owning_port,
 404         u8 phy_index);
 405
 406 struct scic_sds_port *scic_sds_phy_get_port(
 407         struct scic_sds_phy *this_phy);
 408
 409 void scic_sds_phy_set_port(
 410         struct scic_sds_phy *this_phy,
 411         struct scic_sds_port *owning_port);
 412
 413 enum sci_status scic_sds_phy_initialize(
 414         struct scic_sds_phy *this_phy,
 415         struct scu_transport_layer_registers __iomem *transport_layer_registers,
 416         struct scu_link_layer_registers __iomem *link_layer_registers);
 417
 418 enum sci_status scic_sds_phy_start(
 419         struct scic_sds_phy *this_phy);
 420
 421 enum sci_status scic_sds_phy_stop(
 422         struct scic_sds_phy *this_phy);
 423
 424 enum sci_status scic_sds_phy_reset(
 425         struct scic_sds_phy *this_phy);
 426
 427 void scic_sds_phy_resume(
 428         struct scic_sds_phy *this_phy);
 429
 430 void scic_sds_phy_setup_transport(
 431         struct scic_sds_phy *this_phy,
 432         u32 device_id);
 433
 434 enum sci_status scic_sds_phy_event_handler(
 435         struct scic_sds_phy *this_phy,
 436         u32 event_code);
 437
 438 enum sci_status scic_sds_phy_frame_handler(
 439         struct scic_sds_phy *this_phy,
 440         u32 frame_index);
 441
 442 enum sci_status scic_sds_phy_consume_power_handler(
 443         struct scic_sds_phy *this_phy);
 444
 445 void scic_sds_phy_get_sas_address(
 446         struct scic_sds_phy *this_phy,
 447         struct sci_sas_address *sas_address);
 448
 449 void scic_sds_phy_get_attached_sas_address(
 450         struct scic_sds_phy *this_phy,
 451         struct sci_sas_address *sas_address);
 452
 453 void scic_sds_phy_get_protocols(
 454         struct scic_sds_phy *this_phy,
 455         struct sci_sas_identify_address_frame_protocols *protocols);
 456
 457 void scic_sds_phy_get_attached_phy_protocols(
 458         struct scic_sds_phy *this_phy,
 459         struct sci_sas_identify_address_frame_protocols *protocols);
 460
 461 #endif /* _SCIC_SDS_PHY_H_ */