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 /**
  80  * isci_phy - hba local phy infrastructure
  81  * @sm:
  82  * @protocol: attached device protocol
  83  * @phy_index: physical index relative to the controller (0-3)
  84  * @bcn_received_while_port_unassigned: bcn to report after port association
  85  * @sata_timer: timeout SATA signature FIS arrival
  86  */
  87 struct isci_phy {
  88         struct sci_base_state_machine sm;
  89         struct isci_port *owning_port;
  90         enum sas_linkrate max_negotiated_speed;
  91         enum sas_protocol protocol;
  92         u8 phy_index;
  93         bool bcn_received_while_port_unassigned;
  94         bool is_in_link_training;
  95         struct sci_timer sata_timer;
  96         struct scu_transport_layer_registers __iomem *transport_layer_registers;
  97         struct scu_link_layer_registers __iomem *link_layer_registers;
  98         struct asd_sas_phy sas_phy;
  99         u8 sas_addr[SAS_ADDR_SIZE];
 100         union {
 101                 struct sas_identify_frame iaf;
 102                 struct dev_to_host_fis fis;
 103         } frame_rcvd;
 104 };
 105
 106 static inline struct isci_phy *to_iphy(struct asd_sas_phy *sas_phy)
 107 {
 108         struct isci_phy *iphy = container_of(sas_phy, typeof(*iphy), sas_phy);
 109
 110         return iphy;
 111 }
 112
 113 struct sci_phy_cap {
 114         union {
 115                 struct {
 116                         /*
 117                          * The SAS specification indicates the start bit shall
 118                          * always be set to
 119                          * 1.  This implementation will have the start bit set
 120                          * to 0 if the PHY CAPABILITIES were either not
 121                          * received or speed negotiation failed.
 122                          */
 123                         u8 start:1;
 124                         u8 tx_ssc_type:1;
 125                         u8 res1:2;
 126                         u8 req_logical_linkrate:4;
 127
 128                         u32 gen1_no_ssc:1;
 129                         u32 gen1_ssc:1;
 130                         u32 gen2_no_ssc:1;
 131                         u32 gen2_ssc:1;
 132                         u32 gen3_no_ssc:1;
 133                         u32 gen3_ssc:1;
 134                         u32 res2:17;
 135                         u32 parity:1;
 136                 };
 137                 u32 all;
 138         };
 139 }  __packed;
 140
 141 /* this data structure reflects the link layer transmit identification reg */
 142 struct sci_phy_proto {
 143         union {
 144                 struct {
 145                         u16 _r_a:1;
 146                         u16 smp_iport:1;
 147                         u16 stp_iport:1;
 148                         u16 ssp_iport:1;
 149                         u16 _r_b:4;
 150                         u16 _r_c:1;
 151                         u16 smp_tport:1;
 152                         u16 stp_tport:1;
 153                         u16 ssp_tport:1;
 154                         u16 _r_d:4;
 155                 };
 156                 u16 all;
 157         };
 158 } __packed;
 159
 160
 161 /**
 162  * struct sci_phy_properties - This structure defines the properties common to
 163  *    all phys that can be retrieved.
 164  *
 165  *
 166  */
 167 struct sci_phy_properties {
 168         /**
 169          * This field specifies the port that currently contains the
 170          * supplied phy.  This field may be set to NULL
 171          * if the phy is not currently contained in a port.
 172          */
 173         struct isci_port *iport;
 174
 175         /**
 176          * This field specifies the link rate at which the phy is
 177          * currently operating.
 178          */
 179         enum sas_linkrate negotiated_link_rate;
 180
 181         /**
 182          * This field specifies the index of the phy in relation to other
 183          * phys within the controller.  This index is zero relative.
 184          */
 185         u8 index;
 186 };
 187
 188 /**
 189  * struct sci_sas_phy_properties - This structure defines the properties,
 190  *    specific to a SAS phy, that can be retrieved.
 191  *
 192  *
 193  */
 194 struct sci_sas_phy_properties {
 195         /**
 196          * This field delineates the Identify Address Frame received
 197          * from the remote end point.
 198          */
 199         struct sas_identify_frame rcvd_iaf;
 200
 201         /**
 202          * This field delineates the Phy capabilities structure received
 203          * from the remote end point.
 204          */
 205         struct sci_phy_cap rcvd_cap;
 206
 207 };
 208
 209 /**
 210  * struct sci_sata_phy_properties - This structure defines the properties,
 211  *    specific to a SATA phy, that can be retrieved.
 212  *
 213  *
 214  */
 215 struct sci_sata_phy_properties {
 216         /**
 217          * This field delineates the signature FIS received from the
 218          * attached target.
 219          */
 220         struct dev_to_host_fis signature_fis;
 221
 222         /**
 223          * This field specifies to the user if a port selector is connected
 224          * on the specified phy.
 225          */
 226         bool is_port_selector_present;
 227
 228 };
 229
 230 /**
 231  * enum sci_phy_counter_id - This enumeration depicts the various pieces of
 232  *    optional information that can be retrieved for a specific phy.
 233  *
 234  *
 235  */
 236 enum sci_phy_counter_id {
 237         /**
 238          * This PHY information field tracks the number of frames received.
 239          */
 240         SCIC_PHY_COUNTER_RECEIVED_FRAME,
 241
 242         /**
 243          * This PHY information field tracks the number of frames transmitted.
 244          */
 245         SCIC_PHY_COUNTER_TRANSMITTED_FRAME,
 246
 247         /**
 248          * This PHY information field tracks the number of DWORDs received.
 249          */
 250         SCIC_PHY_COUNTER_RECEIVED_FRAME_WORD,
 251
 252         /**
 253          * This PHY information field tracks the number of DWORDs transmitted.
 254          */
 255         SCIC_PHY_COUNTER_TRANSMITTED_FRAME_DWORD,
 256
 257         /**
 258          * This PHY information field tracks the number of times DWORD
 259          * synchronization was lost.
 260          */
 261         SCIC_PHY_COUNTER_LOSS_OF_SYNC_ERROR,
 262
 263         /**
 264          * This PHY information field tracks the number of received DWORDs with
 265          * running disparity errors.
 266          */
 267         SCIC_PHY_COUNTER_RECEIVED_DISPARITY_ERROR,
 268
 269         /**
 270          * This PHY information field tracks the number of received frames with a
 271          * CRC error (not including short or truncated frames).
 272          */
 273         SCIC_PHY_COUNTER_RECEIVED_FRAME_CRC_ERROR,
 274
 275         /**
 276          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 277          * primitives received.
 278          */
 279         SCIC_PHY_COUNTER_RECEIVED_DONE_ACK_NAK_TIMEOUT,
 280
 281         /**
 282          * This PHY information field tracks the number of DONE (ACK/NAK TIMEOUT)
 283          * primitives transmitted.
 284          */
 285         SCIC_PHY_COUNTER_TRANSMITTED_DONE_ACK_NAK_TIMEOUT,
 286
 287         /**
 288          * This PHY information field tracks the number of times the inactivity
 289          * timer for connections on the phy has been utilized.
 290          */
 291         SCIC_PHY_COUNTER_INACTIVITY_TIMER_EXPIRED,
 292
 293         /**
 294          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 295          * primitives received.
 296          */
 297         SCIC_PHY_COUNTER_RECEIVED_DONE_CREDIT_TIMEOUT,
 298
 299         /**
 300          * This PHY information field tracks the number of DONE (CREDIT TIMEOUT)
 301          * primitives transmitted.
 302          */
 303         SCIC_PHY_COUNTER_TRANSMITTED_DONE_CREDIT_TIMEOUT,
 304
 305         /**
 306          * This PHY information field tracks the number of CREDIT BLOCKED
 307          * primitives received.
 308          * @note Depending on remote device implementation, credit blocks
 309          *       may occur regularly.
 310          */
 311         SCIC_PHY_COUNTER_RECEIVED_CREDIT_BLOCKED,
 312
 313         /**
 314          * This PHY information field contains the number of short frames
 315          * received.  A short frame is simply a frame smaller then what is
 316          * allowed by either the SAS or SATA specification.
 317          */
 318         SCIC_PHY_COUNTER_RECEIVED_SHORT_FRAME,
 319
 320         /**
 321          * This PHY information field contains the number of frames received after
 322          * credit has been exhausted.
 323          */
 324         SCIC_PHY_COUNTER_RECEIVED_FRAME_WITHOUT_CREDIT,
 325
 326         /**
 327          * This PHY information field contains the number of frames received after
 328          * a DONE has been received.
 329          */
 330         SCIC_PHY_COUNTER_RECEIVED_FRAME_AFTER_DONE,
 331
 332         /**
 333          * This PHY information field contains the number of times the phy
 334          * failed to achieve DWORD synchronization during speed negotiation.
 335          */
 336         SCIC_PHY_COUNTER_SN_DWORD_SYNC_ERROR
 337 };
 338
 339 /**
 340  * enum sci_phy_states - phy state machine states
 341  * @SCI_PHY_INITIAL: Simply the initial state for the base domain state
 342  *                   machine.
 343  * @SCI_PHY_STOPPED: phy has successfully been stopped.  In this state
 344  *                   no new IO operations are permitted on this phy.
 345  * @SCI_PHY_STARTING: the phy is in the process of becomming ready.  In
 346  *                    this state no new IO operations are permitted on
 347  *                    this phy.
 348  * @SCI_PHY_SUB_INITIAL: Initial state
 349  * @SCI_PHY_SUB_AWAIT_OSSP_EN: Wait state for the hardware OSSP event
 350  *                             type notification
 351  * @SCI_PHY_SUB_AWAIT_SAS_SPEED_EN: Wait state for the PHY speed
 352  *                                  notification
 353  * @SCI_PHY_SUB_AWAIT_IAF_UF: Wait state for the IAF Unsolicited frame
 354  *                            notification
 355  * @SCI_PHY_SUB_AWAIT_SAS_POWER: Wait state for the request to consume
 356  *                               power
 357  * @SCI_PHY_SUB_AWAIT_SATA_POWER: Wait state for request to consume
 358  *                                power
 359  * @SCI_PHY_SUB_AWAIT_SATA_PHY_EN: Wait state for the SATA PHY
 360  *                                 notification
 361  * @SCI_PHY_SUB_AWAIT_SATA_SPEED_EN: Wait for the SATA PHY speed
 362  *                                   notification
 363  * @SCI_PHY_SUB_AWAIT_SIG_FIS_UF: Wait state for the SIGNATURE FIS
 364  *                                unsolicited frame notification
 365  * @SCI_PHY_SUB_FINAL: Exit state for this state machine
 366  * @SCI_PHY_READY: phy is now ready.  Thus, the user is able to perform
 367  *                 IO operations utilizing this phy as long as it is
 368  *                 currently part of a valid port.  This state is
 369  *                 entered from the STARTING state.
 370  * @SCI_PHY_RESETTING: phy is in the process of being reset.  In this
 371  *                     state no new IO operations are permitted on this
 372  *                     phy.  This state is entered from the READY state.
 373  * @SCI_PHY_FINAL: Simply the final state for the base phy state
 374  *                 machine.
 375  */
 376 #define PHY_STATES {\
 377         C(PHY_INITIAL),\
 378         C(PHY_STOPPED),\
 379         C(PHY_STARTING),\
 380         C(PHY_SUB_INITIAL),\
 381         C(PHY_SUB_AWAIT_OSSP_EN),\
 382         C(PHY_SUB_AWAIT_SAS_SPEED_EN),\
 383         C(PHY_SUB_AWAIT_IAF_UF),\
 384         C(PHY_SUB_AWAIT_SAS_POWER),\
 385         C(PHY_SUB_AWAIT_SATA_POWER),\
 386         C(PHY_SUB_AWAIT_SATA_PHY_EN),\
 387         C(PHY_SUB_AWAIT_SATA_SPEED_EN),\
 388         C(PHY_SUB_AWAIT_SIG_FIS_UF),\
 389         C(PHY_SUB_FINAL),\
 390         C(PHY_READY),\
 391         C(PHY_RESETTING),\
 392         C(PHY_FINAL),\
 393         }
 394 #undef C
 395 #define C(a) SCI_##a
 396 enum sci_phy_states PHY_STATES;
 397 #undef C
 398
 399 void sci_phy_construct(
 400         struct isci_phy *iphy,
 401         struct isci_port *iport,
 402         u8 phy_index);
 403
 404 struct isci_port *phy_get_non_dummy_port(struct isci_phy *iphy);
 405
 406 void sci_phy_set_port(
 407         struct isci_phy *iphy,
 408         struct isci_port *iport);
 409
 410 enum sci_status sci_phy_initialize(
 411         struct isci_phy *iphy,
 412         struct scu_transport_layer_registers __iomem *transport_layer_registers,
 413         struct scu_link_layer_registers __iomem *link_layer_registers);
 414
 415 enum sci_status sci_phy_start(
 416         struct isci_phy *iphy);
 417
 418 enum sci_status sci_phy_stop(
 419         struct isci_phy *iphy);
 420
 421 enum sci_status sci_phy_reset(
 422         struct isci_phy *iphy);
 423
 424 void sci_phy_resume(
 425         struct isci_phy *iphy);
 426
 427 void sci_phy_setup_transport(
 428         struct isci_phy *iphy,
 429         u32 device_id);
 430
 431 enum sci_status sci_phy_event_handler(
 432         struct isci_phy *iphy,
 433         u32 event_code);
 434
 435 enum sci_status sci_phy_frame_handler(
 436         struct isci_phy *iphy,
 437         u32 frame_index);
 438
 439 enum sci_status sci_phy_consume_power_handler(
 440         struct isci_phy *iphy);
 441
 442 void sci_phy_get_sas_address(
 443         struct isci_phy *iphy,
 444         struct sci_sas_address *sas_address);
 445
 446 void sci_phy_get_attached_sas_address(
 447         struct isci_phy *iphy,
 448         struct sci_sas_address *sas_address);
 449
 450 struct sci_phy_proto;
 451 void sci_phy_get_protocols(
 452         struct isci_phy *iphy,
 453         struct sci_phy_proto *protocols);
 454 enum sas_linkrate sci_phy_linkrate(struct isci_phy *iphy);
 455
 456 struct isci_host;
 457 void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index);
 458 int isci_phy_control(struct asd_sas_phy *phy, enum phy_func func, void *buf);
 459
 460 #endif /* !defined(_ISCI_PHY_H_) */