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