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 "isci.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 sci_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  * isci_phy - hba local phy infrastructure
  88  * @sm:
  89  * @protocol: attached device protocol
  90  * @phy_index: physical index relative to the controller (0-3)
  91  * @bcn_received_while_port_unassigned: bcn to report after port association
  92  * @sata_timer: timeout SATA signature FIS arrival
  93  */
  94 struct isci_phy {
  95         struct sci_base_state_machine sm;
  96         struct isci_port *owning_port;
  97         enum sas_linkrate max_negotiated_speed;
  98         enum sci_phy_protocol protocol;
  99         u8 phy_index;
 100         bool bcn_received_while_port_unassigned;
 101         bool is_in_link_training;
 102         struct sci_timer sata_timer;
 103         struct scu_transport_layer_registers __iomem *transport_layer_registers;
 104         struct scu_link_layer_registers __iomem *link_layer_registers;
 105         struct asd_sas_phy sas_phy;
 106         u8 sas_addr[SAS_ADDR_SIZE];
 107         union {
 108                 struct sas_identify_frame iaf;
 109                 struct dev_to_host_fis fis;
 110         } frame_rcvd;
 111 };
 112
 113 static inline struct isci_phy *to_iphy(struct asd_sas_phy *sas_phy)
 114 {
 115         struct isci_phy *iphy = container_of(sas_phy, typeof(*iphy), sas_phy);
 116
 117         return iphy;
 118 }
 119
 120 struct sci_phy_cap {
 121         union {
 122                 struct {
 123                         /*
 124                          * The SAS specification indicates the start bit shall
 125                          * always be set to
 126                          * 1.  This implementation will have the start bit set
 127                          * to 0 if the PHY CAPABILITIES were either not
 128                          * received or speed negotiation failed.
 129                          */
 130                         u8 start:1;
 131                         u8 tx_ssc_type:1;
 132                         u8 res1:2;
 133                         u8 req_logical_linkrate:4;
 134
 135                         u32 gen1_no_ssc:1;
 136                         u32 gen1_ssc:1;
 137                         u32 gen2_no_ssc:1;
 138                         u32 gen2_ssc:1;
 139                         u32 gen3_no_ssc:1;
 140                         u32 gen3_ssc:1;
 141                         u32 res2:17;
 142                         u32 parity:1;
 143                 };
 144                 u32 all;
 145         };
 146 }  __packed;
 147
 148 /* this data structure reflects the link layer transmit identification reg */
 149 struct sci_phy_proto {
 150         union {
 151                 struct {
 152                         u16 _r_a:1;
 153                         u16 smp_iport:1;
 154                         u16 stp_iport:1;
 155                         u16 ssp_iport:1;
 156                         u16 _r_b:4;
 157                         u16 _r_c:1;
 158                         u16 smp_tport:1;
 159                         u16 stp_tport:1;
 160                         u16 ssp_tport:1;
 161                         u16 _r_d:4;
 162                 };
 163                 u16 all;
 164         };
 165 } __packed;
 166
 167
 168 /**
 169  * struct sci_phy_properties - This structure defines the properties common to
 170  *    all phys that can be retrieved.
 171  *
 172  *
 173  */
 174 struct sci_phy_properties {
 175         /**
 176          * This field specifies the port that currently contains the
 177          * supplied phy.  This field may be set to NULL
 178          * if the phy is not currently contained in a port.
 179          */
 180         struct isci_port *iport;
 181
 182         /**
 183          * This field specifies the link rate at which the phy is
 184          * currently operating.
 185          */
 186         enum sas_linkrate negotiated_link_rate;
 187
 188         /**
 189          * This field specifies the index of the phy in relation to other
 190          * phys within the controller.  This index is zero relative.
 191          */
 192         u8 index;
 193 };
 194
 195 /**
 196  * struct sci_sas_phy_properties - This structure defines the properties,
 197  *    specific to a SAS phy, that can be retrieved.
 198  *
 199  *
 200  */
 201 struct sci_sas_phy_properties {
 202         /**
 203          * This field delineates the Identify Address Frame received
 204          * from the remote end point.
 205          */
 206         struct sas_identify_frame rcvd_iaf;
 207
 208         /**
 209          * This field delineates the Phy capabilities structure received
 210          * from the remote end point.
 211          */
 212         struct sci_phy_cap rcvd_cap;
 213
 214 };
 215
 216 /**
 217  * struct sci_sata_phy_properties - This structure defines the properties,
 218  *    specific to a SATA phy, that can be retrieved.
 219  *
 220  *
 221  */
 222 struct sci_sata_phy_properties {
 223         /**
 224          * This field delineates the signature FIS received from the
 225          * attached target.
 226          */
 227         struct dev_to_host_fis signature_fis;
 228
 229         /**
 230          * This field specifies to the user if a port selector is connected
 231          * on the specified phy.
 232          */
 233         bool is_port_selector_present;
 234
 235 };
 236
 237 /**
 238  * enum sci_phy_counter_id - This enumeration depicts the various pieces of
 239  *    optional information that can be retrieved for a specific phy.
 240  *
 241  *
 242  */
 243 enum sci_phy_counter_id {
 244         /**
 245          * This PHY information field tracks the number of frames received.
 246          */
 247         SCIC_PHY_COUNTER_RECEIVED_FRAME,
 248
 249         /**
 250          * This PHY information field tracks the number of frames transmitted.
 251          */
 252         SCIC_PHY_COUNTER_TRANSMITTED_FRAME,
 253
 254         /**
 255          * This PHY information field tracks the number of DWORDs received.
 256          */
 257         SCIC_PHY_COUNTER_RECEIVED_FRAME_WORD,
 258
 259         /**
 260          * This PHY information field tracks the number of DWORDs transmitted.
 261          */
 262         SCIC_PHY_COUNTER_TRANSMITTED_FRAME_DWORD,
 263
 264         /**
 265          * This PHY information field tracks the number of times DWORD
 266          * synchronization was lost.
 267          */
 268         SCIC_PHY_COUNTER_LOSS_OF_SYNC_ERROR,
 269
 270         /**
 271          * This PHY information field tracks the number of received DWORDs with
 272          * running disparity errors.
 273          */
 274         SCIC_PHY_COUNTER_RECEIVED_DISPARITY_ERROR,
 275
 276         /**
 277          * This PHY information field tracks the number of received frames with a
 278          * CRC error (not including short or truncated frames).
 279          */
 280         SCIC_PHY_COUNTER_RECEIVED_FRAME_CRC_ERROR,
 281
 282         /**
 283          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 284          * primitives received.
 285          */
 286         SCIC_PHY_COUNTER_RECEIVED_DONE_ACK_NAK_TIMEOUT,
 287
 288         /**
 289          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 290          * primitives transmitted.
 291          */
 292         SCIC_PHY_COUNTER_TRANSMITTED_DONE_ACK_NAK_TIMEOUT,
 293
 294         /**
 295          * This PHY information field tracks the number of times the inactivity
 296          * timer for connections on the phy has been utilized.
 297          */
 298         SCIC_PHY_COUNTER_INACTIVITY_TIMER_EXPIRED,
 299
 300         /**
 301          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 302          * primitives received.
 303          */
 304         SCIC_PHY_COUNTER_RECEIVED_DONE_CREDIT_TIMEOUT,
 305
 306         /**
 307          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 308          * primitives transmitted.
 309          */
 310         SCIC_PHY_COUNTER_TRANSMITTED_DONE_CREDIT_TIMEOUT,
 311
 312         /**
 313          * This PHY information field tracks the number of CREDIT BLOCKED
 314          * primitives received.
 315          * @note Depending on remote device implementation, credit blocks
 316          *       may occur regularly.
 317          */
 318         SCIC_PHY_COUNTER_RECEIVED_CREDIT_BLOCKED,
 319
 320         /**
 321          * This PHY information field contains the number of short frames
 322          * received.  A short frame is simply a frame smaller then what is
 323          * allowed by either the SAS or SATA specification.
 324          */
 325         SCIC_PHY_COUNTER_RECEIVED_SHORT_FRAME,
 326
 327         /**
 328          * This PHY information field contains the number of frames received after
 329          * credit has been exhausted.
 330          */
 331         SCIC_PHY_COUNTER_RECEIVED_FRAME_WITHOUT_CREDIT,
 332
 333         /**
 334          * This PHY information field contains the number of frames received after
 335          * a DONE has been received.
 336          */
 337         SCIC_PHY_COUNTER_RECEIVED_FRAME_AFTER_DONE,
 338
 339         /**
 340          * This PHY information field contains the number of times the phy
 341          * failed to achieve DWORD synchronization during speed negotiation.
 342          */
 343         SCIC_PHY_COUNTER_SN_DWORD_SYNC_ERROR
 344 };
 345
 346 /**
 347  * enum sci_phy_states - phy state machine states
 348  * @SCI_PHY_INITIAL: Simply the initial state for the base domain state
 349  *                   machine.
 350  * @SCI_PHY_STOPPED: phy has successfully been stopped.  In this state
 351  *                   no new IO operations are permitted on this phy.
 352  * @SCI_PHY_STARTING: the phy is in the process of becomming ready.  In
 353  *                    this state no new IO operations are permitted on
 354  *                    this phy.
 355  * @SCI_PHY_SUB_INITIAL: Initial state
 356  * @SCI_PHY_SUB_AWAIT_OSSP_EN: Wait state for the hardware OSSP event
 357  *                             type notification
 358  * @SCI_PHY_SUB_AWAIT_SAS_SPEED_EN: Wait state for the PHY speed
 359  *                                  notification
 360  * @SCI_PHY_SUB_AWAIT_IAF_UF: Wait state for the IAF Unsolicited frame
 361  *                            notification
 362  * @SCI_PHY_SUB_AWAIT_SAS_POWER: Wait state for the request to consume
 363  *                               power
 364  * @SCI_PHY_SUB_AWAIT_SATA_POWER: Wait state for request to consume
 365  *                                power
 366  * @SCI_PHY_SUB_AWAIT_SATA_PHY_EN: Wait state for the SATA PHY
 367  *                                 notification
 368  * @SCI_PHY_SUB_AWAIT_SATA_SPEED_EN: Wait for the SATA PHY speed
 369  *                                   notification
 370  * @SCI_PHY_SUB_AWAIT_SIG_FIS_UF: Wait state for the SIGNATURE FIS
 371  *                                unsolicited frame notification
 372  * @SCI_PHY_SUB_FINAL: Exit state for this state machine
 373  * @SCI_PHY_READY: phy is now ready.  Thus, the user is able to perform
 374  *                 IO operations utilizing this phy as long as it is
 375  *                 currently part of a valid port.  This state is
 376  *                 entered from the STARTING state.
 377  * @SCI_PHY_RESETTING: phy is in the process of being reset.  In this
 378  *                     state no new IO operations are permitted on this
 379  *                     phy.  This state is entered from the READY state.
 380  * @SCI_PHY_FINAL: Simply the final state for the base phy state
 381  *                 machine.
 382  */
 383 #define PHY_STATES {\
 384         C(PHY_INITIAL),\
 385         C(PHY_STOPPED),\
 386         C(PHY_STARTING),\
 387         C(PHY_SUB_INITIAL),\
 388         C(PHY_SUB_AWAIT_OSSP_EN),\
 389         C(PHY_SUB_AWAIT_SAS_SPEED_EN),\
 390         C(PHY_SUB_AWAIT_IAF_UF),\
 391         C(PHY_SUB_AWAIT_SAS_POWER),\
 392         C(PHY_SUB_AWAIT_SATA_POWER),\
 393         C(PHY_SUB_AWAIT_SATA_PHY_EN),\
 394         C(PHY_SUB_AWAIT_SATA_SPEED_EN),\
 395         C(PHY_SUB_AWAIT_SIG_FIS_UF),\
 396         C(PHY_SUB_FINAL),\
 397         C(PHY_READY),\
 398         C(PHY_RESETTING),\
 399         C(PHY_FINAL),\
 400         }
 401 #undef C
 402 #define C(a) SCI_##a
 403 enum sci_phy_states PHY_STATES;
 404 #undef C
 405
 406 void sci_phy_construct(
 407         struct isci_phy *iphy,
 408         struct isci_port *iport,
 409         u8 phy_index);
 410
 411 struct isci_port *phy_get_non_dummy_port(struct isci_phy *iphy);
 412
 413 void sci_phy_set_port(
 414         struct isci_phy *iphy,
 415         struct isci_port *iport);
 416
 417 enum sci_status sci_phy_initialize(
 418         struct isci_phy *iphy,
 419         struct scu_transport_layer_registers __iomem *transport_layer_registers,
 420         struct scu_link_layer_registers __iomem *link_layer_registers);
 421
 422 enum sci_status sci_phy_start(
 423         struct isci_phy *iphy);
 424
 425 enum sci_status sci_phy_stop(
 426         struct isci_phy *iphy);
 427
 428 enum sci_status sci_phy_reset(
 429         struct isci_phy *iphy);
 430
 431 void sci_phy_resume(
 432         struct isci_phy *iphy);
 433
 434 void sci_phy_setup_transport(
 435         struct isci_phy *iphy,
 436         u32 device_id);
 437
 438 enum sci_status sci_phy_event_handler(
 439         struct isci_phy *iphy,
 440         u32 event_code);
 441
 442 enum sci_status sci_phy_frame_handler(
 443         struct isci_phy *iphy,
 444         u32 frame_index);
 445
 446 enum sci_status sci_phy_consume_power_handler(
 447         struct isci_phy *iphy);
 448
 449 void sci_phy_get_sas_address(
 450         struct isci_phy *iphy,
 451         struct sci_sas_address *sas_address);
 452
 453 void sci_phy_get_attached_sas_address(
 454         struct isci_phy *iphy,
 455         struct sci_sas_address *sas_address);
 456
 457 struct sci_phy_proto;
 458 void sci_phy_get_protocols(
 459         struct isci_phy *iphy,
 460         struct sci_phy_proto *protocols);
 461 enum sas_linkrate sci_phy_linkrate(struct isci_phy *iphy);
 462
 463 struct isci_host;
 464 void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index);
 465 int isci_phy_control(struct asd_sas_phy *phy, enum phy_func func, void *buf);
 466
 467 #endif /* !defined(_ISCI_PHY_H_) */