kernel/drivers/scsi/isci/phy.c

   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 #include "isci.h"
  57 #include "host.h"
  58 #include "phy.h"
  59 #include "scu_event_codes.h"
  60 #include "probe_roms.h"
  61
  62 #undef C
  63 #define C(a) (#a)
  64 static const char *phy_state_name(enum sci_phy_states state)
  65 {
  66         static const char * const strings[] = PHY_STATES;
  67
  68         return strings[state];
  69 }
  70 #undef C
  71
  72 /* Maximum arbitration wait time in micro-seconds */
  73 #define SCIC_SDS_PHY_MAX_ARBITRATION_WAIT_TIME  (700)
  74
  75 enum sas_linkrate sci_phy_linkrate(struct isci_phy *iphy)
  76 {
  77         return iphy->max_negotiated_speed;
  78 }
  79
  80 static struct isci_host *phy_to_host(struct isci_phy *iphy)
  81 {
  82         struct isci_phy *table = iphy - iphy->phy_index;
  83         struct isci_host *ihost = container_of(table, typeof(*ihost), phys[0]);
  84
  85         return ihost;
  86 }
  87
  88 static struct device *sciphy_to_dev(struct isci_phy *iphy)
  89 {
  90         return &phy_to_host(iphy)->pdev->dev;
  91 }
  92
  93 static enum sci_status
  94 sci_phy_transport_layer_initialization(struct isci_phy *iphy,
  95                                        struct scu_transport_layer_registers __iomem *reg)
  96 {
  97         u32 tl_control;
  98
  99         iphy->transport_layer_registers = reg;
 100
 101         writel(SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX,
 102                 &iphy->transport_layer_registers->stp_rni);
 103
 104         /*
 105          * Hardware team recommends that we enable the STP prefetch for all
 106          * transports
 107          */
 108         tl_control = readl(&iphy->transport_layer_registers->control);
 109         tl_control |= SCU_TLCR_GEN_BIT(STP_WRITE_DATA_PREFETCH);
 110         writel(tl_control, &iphy->transport_layer_registers->control);
 111
 112         return SCI_SUCCESS;
 113 }
 114
 115 static enum sci_status
 116 sci_phy_link_layer_initialization(struct isci_phy *iphy,
 117                                   struct scu_link_layer_registers __iomem *llr)
 118 {
 119         struct isci_host *ihost = iphy->owning_port->owning_controller;
 120         struct sci_phy_user_params *phy_user;
 121         struct sci_phy_oem_params *phy_oem;
 122         int phy_idx = iphy->phy_index;
 123         struct sci_phy_cap phy_cap;
 124         u32 phy_configuration;
 125         u32 parity_check = 0;
 126         u32 parity_count = 0;
 127         u32 llctl, link_rate;
 128         u32 clksm_value = 0;
 129         u32 sp_timeouts = 0;
 130
 131         phy_user = &ihost->user_parameters.phys[phy_idx];
 132         phy_oem = &ihost->oem_parameters.phys[phy_idx];
 133         iphy->link_layer_registers = llr;
 134
 135         /* Set our IDENTIFY frame data */
 136         #define SCI_END_DEVICE 0x01
 137
 138         writel(SCU_SAS_TIID_GEN_BIT(SMP_INITIATOR) |
 139                SCU_SAS_TIID_GEN_BIT(SSP_INITIATOR) |
 140                SCU_SAS_TIID_GEN_BIT(STP_INITIATOR) |
 141                SCU_SAS_TIID_GEN_BIT(DA_SATA_HOST) |
 142                SCU_SAS_TIID_GEN_VAL(DEVICE_TYPE, SCI_END_DEVICE),
 143                &llr->transmit_identification);
 144
 145         /* Write the device SAS Address */
 146         writel(0xFEDCBA98, &llr->sas_device_name_high);
 147         writel(phy_idx, &llr->sas_device_name_low);
 148
 149         /* Write the source SAS Address */
 150         writel(phy_oem->sas_address.high, &llr->source_sas_address_high);
 151         writel(phy_oem->sas_address.low, &llr->source_sas_address_low);
 152
 153         /* Clear and Set the PHY Identifier */
 154         writel(0, &llr->identify_frame_phy_id);
 155         writel(SCU_SAS_TIPID_GEN_VALUE(ID, phy_idx), &llr->identify_frame_phy_id);
 156
 157         /* Change the initial state of the phy configuration register */
 158         phy_configuration = readl(&llr->phy_configuration);
 159
 160         /* Hold OOB state machine in reset */
 161         phy_configuration |=  SCU_SAS_PCFG_GEN_BIT(OOB_RESET);
 162         writel(phy_configuration, &llr->phy_configuration);
 163
 164         /* Configure the SNW capabilities */
 165         phy_cap.all = 0;
 166         phy_cap.start = 1;
 167         phy_cap.gen3_no_ssc = 1;
 168         phy_cap.gen2_no_ssc = 1;
 169         phy_cap.gen1_no_ssc = 1;
 170         if (ihost->oem_parameters.controller.do_enable_ssc) {
 171                 struct scu_afe_registers __iomem *afe = &ihost->scu_registers->afe;
 172                 struct scu_afe_transceiver __iomem *xcvr = &afe->scu_afe_xcvr[phy_idx];
 173                 struct isci_pci_info *pci_info = to_pci_info(ihost->pdev);
 174                 bool en_sas = false;
 175                 bool en_sata = false;
 176                 u32 sas_type = 0;
 177                 u32 sata_spread = 0x2;
 178                 u32 sas_spread = 0x2;
 179
 180                 phy_cap.gen3_ssc = 1;
 181                 phy_cap.gen2_ssc = 1;
 182                 phy_cap.gen1_ssc = 1;
 183
 184                 if (pci_info->orom->hdr.version < ISCI_ROM_VER_1_1)
 185                         en_sas = en_sata = true;
 186                 else {
 187                         sata_spread = ihost->oem_parameters.controller.ssc_sata_tx_spread_level;
 188                         sas_spread = ihost->oem_parameters.controller.ssc_sas_tx_spread_level;
 189
 190                         if (sata_spread)
 191                                 en_sata = true;
 192
 193                         if (sas_spread) {
 194                                 en_sas = true;
 195                                 sas_type = ihost->oem_parameters.controller.ssc_sas_tx_type;
 196                         }
 197
 198                 }
 199
 200                 if (en_sas) {
 201                         u32 reg;
 202
 203                         reg = readl(&xcvr->afe_xcvr_control0);
 204                         reg |= (0x00100000 | (sas_type << 19));
 205                         writel(reg, &xcvr->afe_xcvr_control0);
 206
 207                         reg = readl(&xcvr->afe_tx_ssc_control);
 208                         reg |= sas_spread << 8;
 209                         writel(reg, &xcvr->afe_tx_ssc_control);
 210                 }
 211
 212                 if (en_sata) {
 213                         u32 reg;
 214
 215                         reg = readl(&xcvr->afe_tx_ssc_control);
 216                         reg |= sata_spread;
 217                         writel(reg, &xcvr->afe_tx_ssc_control);
 218
 219                         reg = readl(&llr->stp_control);
 220                         reg |= 1 << 12;
 221                         writel(reg, &llr->stp_control);
 222                 }
 223         }
 224
 225         /* The SAS specification indicates that the phy_capabilities that
 226          * are transmitted shall have an even parity.  Calculate the parity.
 227          */
 228         parity_check = phy_cap.all;
 229         while (parity_check != 0) {
 230                 if (parity_check & 0x1)
 231                         parity_count++;
 232                 parity_check >>= 1;
 233         }
 234
 235         /* If parity indicates there are an odd number of bits set, then
 236          * set the parity bit to 1 in the phy capabilities.
 237          */
 238         if ((parity_count % 2) != 0)
 239                 phy_cap.parity = 1;
 240
 241         writel(phy_cap.all, &llr->phy_capabilities);
 242
 243         /* Set the enable spinup period but disable the ability to send
 244          * notify enable spinup
 245          */
 246         writel(SCU_ENSPINUP_GEN_VAL(COUNT,
 247                         phy_user->notify_enable_spin_up_insertion_frequency),
 248                 &llr->notify_enable_spinup_control);
 249
 250         /* Write the ALIGN Insertion Ferequency for connected phy and
 251          * inpendent of connected state
 252          */
 253         clksm_value = SCU_ALIGN_INSERTION_FREQUENCY_GEN_VAL(CONNECTED,
 254                         phy_user->in_connection_align_insertion_frequency);
 255
 256         clksm_value |= SCU_ALIGN_INSERTION_FREQUENCY_GEN_VAL(GENERAL,
 257                         phy_user->align_insertion_frequency);
 258
 259         writel(clksm_value, &llr->clock_skew_management);
 260
 261         if (is_c0(ihost->pdev) || is_c1(ihost->pdev)) {
 262                 writel(0x04210400, &llr->afe_lookup_table_control);
 263                 writel(0x020A7C05, &llr->sas_primitive_timeout);
 264         } else
 265                 writel(0x02108421, &llr->afe_lookup_table_control);
 266
 267         llctl = SCU_SAS_LLCTL_GEN_VAL(NO_OUTBOUND_TASK_TIMEOUT,
 268                 (u8)ihost->user_parameters.no_outbound_task_timeout);
 269
 270         switch (phy_user->max_speed_generation) {
 271         case SCIC_SDS_PARM_GEN3_SPEED:
 272                 link_rate = SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_GEN3;
 273                 break;
 274         case SCIC_SDS_PARM_GEN2_SPEED:
 275                 link_rate = SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_GEN2;
 276                 break;
 277         default:
 278                 link_rate = SCU_SAS_LINK_LAYER_CONTROL_MAX_LINK_RATE_GEN1;
 279                 break;
 280         }
 281         llctl |= SCU_SAS_LLCTL_GEN_VAL(MAX_LINK_RATE, link_rate);
 282         writel(llctl, &llr->link_layer_control);
 283
 284         sp_timeouts = readl(&llr->sas_phy_timeouts);
 285
 286         /* Clear the default 0x36 (54us) RATE_CHANGE timeout value. */
 287         sp_timeouts &= ~SCU_SAS_PHYTOV_GEN_VAL(RATE_CHANGE, 0xFF);
 288
 289         /* Set RATE_CHANGE timeout value to 0x3B (59us).  This ensures SCU can
 290          * lock with 3Gb drive when SCU max rate is set to 1.5Gb.
 291          */
 292         sp_timeouts |= SCU_SAS_PHYTOV_GEN_VAL(RATE_CHANGE, 0x3B);
 293
 294         writel(sp_timeouts, &llr->sas_phy_timeouts);
 295
 296         if (is_a2(ihost->pdev)) {
 297                 /* Program the max ARB time for the PHY to 700us so we
 298                  * inter-operate with the PMC expander which shuts down
 299                  * PHYs if the expander PHY generates too many breaks.
 300                  * This time value will guarantee that the initiator PHY
 301                  * will generate the break.
 302                  */
 303                 writel(SCIC_SDS_PHY_MAX_ARBITRATION_WAIT_TIME,
 304                        &llr->maximum_arbitration_wait_timer_timeout);
 305         }
 306
 307         /* Disable link layer hang detection, rely on the OS timeout for
 308          * I/O timeouts.
 309          */
 310         writel(0, &llr->link_layer_hang_detection_timeout);
 311
 312         /* We can exit the initial state to the stopped state */
 313         sci_change_state(&iphy->sm, SCI_PHY_STOPPED);
 314
 315         return SCI_SUCCESS;
 316 }
 317
 318 static void phy_sata_timeout(unsigned long data)
 319 {
 320         struct sci_timer *tmr = (struct sci_timer *)data;
 321         struct isci_phy *iphy = container_of(tmr, typeof(*iphy), sata_timer);
 322         struct isci_host *ihost = iphy->owning_port->owning_controller;
 323         unsigned long flags;
 324
 325         spin_lock_irqsave(&ihost->scic_lock, flags);
 326
 327         if (tmr->cancel)
 328                 goto done;
 329
 330         dev_dbg(sciphy_to_dev(iphy),
 331                  "%s: SCIC SDS Phy 0x%p did not receive signature fis before "
 332                  "timeout.\n",
 333                  __func__,
 334                  iphy);
 335
 336         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 337 done:
 338         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 339 }
 340
 341 /**
 342  * This method returns the port currently containing this phy. If the phy is
 343  *    currently contained by the dummy port, then the phy is considered to not
 344  *    be part of a port.
 345  * @sci_phy: This parameter specifies the phy for which to retrieve the
 346  *    containing port.
 347  *
 348  * This method returns a handle to a port that contains the supplied phy.
 349  * NULL This value is returned if the phy is not part of a real
 350  * port (i.e. it's contained in the dummy port). !NULL All other
 351  * values indicate a handle/pointer to the port containing the phy.
 352  */
 353 struct isci_port *phy_get_non_dummy_port(struct isci_phy *iphy)
 354 {
 355         struct isci_port *iport = iphy->owning_port;
 356
 357         if (iport->physical_port_index == SCIC_SDS_DUMMY_PORT)
 358                 return NULL;
 359
 360         return iphy->owning_port;
 361 }
 362
 363 /**
 364  * This method will assign a port to the phy object.
 365  * @out]: iphy This parameter specifies the phy for which to assign a port
 366  *    object.
 367  *
 368  *
 369  */
 370 void sci_phy_set_port(
 371         struct isci_phy *iphy,
 372         struct isci_port *iport)
 373 {
 374         iphy->owning_port = iport;
 375
 376         if (iphy->bcn_received_while_port_unassigned) {
 377                 iphy->bcn_received_while_port_unassigned = false;
 378                 sci_port_broadcast_change_received(iphy->owning_port, iphy);
 379         }
 380 }
 381
 382 enum sci_status sci_phy_initialize(struct isci_phy *iphy,
 383                                    struct scu_transport_layer_registers __iomem *tl,
 384                                    struct scu_link_layer_registers __iomem *ll)
 385 {
 386         /* Perfrom the initialization of the TL hardware */
 387         sci_phy_transport_layer_initialization(iphy, tl);
 388
 389         /* Perofrm the initialization of the PE hardware */
 390         sci_phy_link_layer_initialization(iphy, ll);
 391
 392         /* There is nothing that needs to be done in this state just
 393          * transition to the stopped state
 394          */
 395         sci_change_state(&iphy->sm, SCI_PHY_STOPPED);
 396
 397         return SCI_SUCCESS;
 398 }
 399
 400 /**
 401  * This method assigns the direct attached device ID for this phy.
 402  *
 403  * @iphy The phy for which the direct attached device id is to
 404  *       be assigned.
 405  * @device_id The direct attached device ID to assign to the phy.
 406  *       This will either be the RNi for the device or an invalid RNi if there
 407  *       is no current device assigned to the phy.
 408  */
 409 void sci_phy_setup_transport(struct isci_phy *iphy, u32 device_id)
 410 {
 411         u32 tl_control;
 412
 413         writel(device_id, &iphy->transport_layer_registers->stp_rni);
 414
 415         /*
 416          * The read should guarantee that the first write gets posted
 417          * before the next write
 418          */
 419         tl_control = readl(&iphy->transport_layer_registers->control);
 420         tl_control |= SCU_TLCR_GEN_BIT(CLEAR_TCI_NCQ_MAPPING_TABLE);
 421         writel(tl_control, &iphy->transport_layer_registers->control);
 422 }
 423
 424 static void sci_phy_suspend(struct isci_phy *iphy)
 425 {
 426         u32 scu_sas_pcfg_value;
 427
 428         scu_sas_pcfg_value =
 429                 readl(&iphy->link_layer_registers->phy_configuration);
 430         scu_sas_pcfg_value |= SCU_SAS_PCFG_GEN_BIT(SUSPEND_PROTOCOL_ENGINE);
 431         writel(scu_sas_pcfg_value,
 432                 &iphy->link_layer_registers->phy_configuration);
 433
 434         sci_phy_setup_transport(iphy, SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);
 435 }
 436
 437 void sci_phy_resume(struct isci_phy *iphy)
 438 {
 439         u32 scu_sas_pcfg_value;
 440
 441         scu_sas_pcfg_value =
 442                 readl(&iphy->link_layer_registers->phy_configuration);
 443         scu_sas_pcfg_value &= ~SCU_SAS_PCFG_GEN_BIT(SUSPEND_PROTOCOL_ENGINE);
 444         writel(scu_sas_pcfg_value,
 445                 &iphy->link_layer_registers->phy_configuration);
 446 }
 447
 448 void sci_phy_get_sas_address(struct isci_phy *iphy, struct sci_sas_address *sas)
 449 {
 450         sas->high = readl(&iphy->link_layer_registers->source_sas_address_high);
 451         sas->low = readl(&iphy->link_layer_registers->source_sas_address_low);
 452 }
 453
 454 void sci_phy_get_attached_sas_address(struct isci_phy *iphy, struct sci_sas_address *sas)
 455 {
 456         struct sas_identify_frame *iaf;
 457
 458         iaf = &iphy->frame_rcvd.iaf;
 459         memcpy(sas, iaf->sas_addr, SAS_ADDR_SIZE);
 460 }
 461
 462 void sci_phy_get_protocols(struct isci_phy *iphy, struct sci_phy_proto *proto)
 463 {
 464         proto->all = readl(&iphy->link_layer_registers->transmit_identification);
 465 }
 466
 467 enum sci_status sci_phy_start(struct isci_phy *iphy)
 468 {
 469         enum sci_phy_states state = iphy->sm.current_state_id;
 470
 471         if (state != SCI_PHY_STOPPED) {
 472                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
 473                         __func__, phy_state_name(state));
 474                 return SCI_FAILURE_INVALID_STATE;
 475         }
 476
 477         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 478         return SCI_SUCCESS;
 479 }
 480
 481 enum sci_status sci_phy_stop(struct isci_phy *iphy)
 482 {
 483         enum sci_phy_states state = iphy->sm.current_state_id;
 484
 485         switch (state) {
 486         case SCI_PHY_SUB_INITIAL:
 487         case SCI_PHY_SUB_AWAIT_OSSP_EN:
 488         case SCI_PHY_SUB_AWAIT_SAS_SPEED_EN:
 489         case SCI_PHY_SUB_AWAIT_SAS_POWER:
 490         case SCI_PHY_SUB_AWAIT_SATA_POWER:
 491         case SCI_PHY_SUB_AWAIT_SATA_PHY_EN:
 492         case SCI_PHY_SUB_AWAIT_SATA_SPEED_EN:
 493         case SCI_PHY_SUB_AWAIT_SIG_FIS_UF:
 494         case SCI_PHY_SUB_FINAL:
 495         case SCI_PHY_READY:
 496                 break;
 497         default:
 498                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
 499                         __func__, phy_state_name(state));
 500                 return SCI_FAILURE_INVALID_STATE;
 501         }
 502
 503         sci_change_state(&iphy->sm, SCI_PHY_STOPPED);
 504         return SCI_SUCCESS;
 505 }
 506
 507 enum sci_status sci_phy_reset(struct isci_phy *iphy)
 508 {
 509         enum sci_phy_states state = iphy->sm.current_state_id;
 510
 511         if (state != SCI_PHY_READY) {
 512                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
 513                         __func__, phy_state_name(state));
 514                 return SCI_FAILURE_INVALID_STATE;
 515         }
 516
 517         sci_change_state(&iphy->sm, SCI_PHY_RESETTING);
 518         return SCI_SUCCESS;
 519 }
 520
 521 enum sci_status sci_phy_consume_power_handler(struct isci_phy *iphy)
 522 {
 523         enum sci_phy_states state = iphy->sm.current_state_id;
 524
 525         switch (state) {
 526         case SCI_PHY_SUB_AWAIT_SAS_POWER: {
 527                 u32 enable_spinup;
 528
 529                 enable_spinup = readl(&iphy->link_layer_registers->notify_enable_spinup_control);
 530                 enable_spinup |= SCU_ENSPINUP_GEN_BIT(ENABLE);
 531                 writel(enable_spinup, &iphy->link_layer_registers->notify_enable_spinup_control);
 532
 533                 /* Change state to the final state this substate machine has run to completion */
 534                 sci_change_state(&iphy->sm, SCI_PHY_SUB_FINAL);
 535
 536                 return SCI_SUCCESS;
 537         }
 538         case SCI_PHY_SUB_AWAIT_SATA_POWER: {
 539                 u32 scu_sas_pcfg_value;
 540
 541                 /* Release the spinup hold state and reset the OOB state machine */
 542                 scu_sas_pcfg_value =
 543                         readl(&iphy->link_layer_registers->phy_configuration);
 544                 scu_sas_pcfg_value &=
 545                         ~(SCU_SAS_PCFG_GEN_BIT(SATA_SPINUP_HOLD) | SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE));
 546                 scu_sas_pcfg_value |= SCU_SAS_PCFG_GEN_BIT(OOB_RESET);
 547                 writel(scu_sas_pcfg_value,
 548                         &iphy->link_layer_registers->phy_configuration);
 549
 550                 /* Now restart the OOB operation */
 551                 scu_sas_pcfg_value &= ~SCU_SAS_PCFG_GEN_BIT(OOB_RESET);
 552                 scu_sas_pcfg_value |= SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE);
 553                 writel(scu_sas_pcfg_value,
 554                         &iphy->link_layer_registers->phy_configuration);
 555
 556                 /* Change state to the final state this substate machine has run to completion */
 557                 sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_SATA_PHY_EN);
 558
 559                 return SCI_SUCCESS;
 560         }
 561         default:
 562                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
 563                         __func__, phy_state_name(state));
 564                 return SCI_FAILURE_INVALID_STATE;
 565         }
 566 }
 567
 568 static void sci_phy_start_sas_link_training(struct isci_phy *iphy)
 569 {
 570         /* continue the link training for the phy as if it were a SAS PHY
 571          * instead of a SATA PHY. This is done because the completion queue had a SAS
 572          * PHY DETECTED event when the state machine was expecting a SATA PHY event.
 573          */
 574         u32 phy_control;
 575
 576         phy_control = readl(&iphy->link_layer_registers->phy_configuration);
 577         phy_control |= SCU_SAS_PCFG_GEN_BIT(SATA_SPINUP_HOLD);
 578         writel(phy_control,
 579                &iphy->link_layer_registers->phy_configuration);
 580
 581         sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_SAS_SPEED_EN);
 582
 583         iphy->protocol = SAS_PROTOCOL_SSP;
 584 }
 585
 586 static void sci_phy_start_sata_link_training(struct isci_phy *iphy)
 587 {
 588         /* This method continues the link training for the phy as if it were a SATA PHY
 589          * instead of a SAS PHY.  This is done because the completion queue had a SATA
 590          * SPINUP HOLD event when the state machine was expecting a SAS PHY event. none
 591          */
 592         sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_SATA_POWER);
 593
 594         iphy->protocol = SAS_PROTOCOL_SATA;
 595 }
 596
 597 /**
 598  * sci_phy_complete_link_training - perform processing common to
 599  *    all protocols upon completion of link training.
 600  * @sci_phy: This parameter specifies the phy object for which link training
 601  *    has completed.
 602  * @max_link_rate: This parameter specifies the maximum link rate to be
 603  *    associated with this phy.
 604  * @next_state: This parameter specifies the next state for the phy's starting
 605  *    sub-state machine.
 606  *
 607  */
 608 static void sci_phy_complete_link_training(struct isci_phy *iphy,
 609                                            enum sas_linkrate max_link_rate,
 610                                            u32 next_state)
 611 {
 612         iphy->max_negotiated_speed = max_link_rate;
 613
 614         sci_change_state(&iphy->sm, next_state);
 615 }
 616
 617 static const char *phy_event_name(u32 event_code)
 618 {
 619         switch (scu_get_event_code(event_code)) {
 620         case SCU_EVENT_PORT_SELECTOR_DETECTED:
 621                 return "port selector";
 622         case SCU_EVENT_SENT_PORT_SELECTION:
 623                 return "port selection";
 624         case SCU_EVENT_HARD_RESET_TRANSMITTED:
 625                 return "tx hard reset";
 626         case SCU_EVENT_HARD_RESET_RECEIVED:
 627                 return "rx hard reset";
 628         case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
 629                 return "identify timeout";
 630         case SCU_EVENT_LINK_FAILURE:
 631                 return "link fail";
 632         case SCU_EVENT_SATA_SPINUP_HOLD:
 633                 return "sata spinup hold";
 634         case SCU_EVENT_SAS_15_SSC:
 635         case SCU_EVENT_SAS_15:
 636                 return "sas 1.5";
 637         case SCU_EVENT_SAS_30_SSC:
 638         case SCU_EVENT_SAS_30:
 639                 return "sas 3.0";
 640         case SCU_EVENT_SAS_60_SSC:
 641         case SCU_EVENT_SAS_60:
 642                 return "sas 6.0";
 643         case SCU_EVENT_SATA_15_SSC:
 644         case SCU_EVENT_SATA_15:
 645                 return "sata 1.5";
 646         case SCU_EVENT_SATA_30_SSC:
 647         case SCU_EVENT_SATA_30:
 648                 return "sata 3.0";
 649         case SCU_EVENT_SATA_60_SSC:
 650         case SCU_EVENT_SATA_60:
 651                 return "sata 6.0";
 652         case SCU_EVENT_SAS_PHY_DETECTED:
 653                 return "sas detect";
 654         case SCU_EVENT_SATA_PHY_DETECTED:
 655                 return "sata detect";
 656         default:
 657                 return "unknown";
 658         }
 659 }
 660
 661 #define phy_event_dbg(iphy, state, code) \
 662         dev_dbg(sciphy_to_dev(iphy), "phy-%d:%d: %s event: %s (%x)\n", \
 663                 phy_to_host(iphy)->id, iphy->phy_index, \
 664                 phy_state_name(state), phy_event_name(code), code)
 665
 666 #define phy_event_warn(iphy, state, code) \
 667         dev_warn(sciphy_to_dev(iphy), "phy-%d:%d: %s event: %s (%x)\n", \
 668                 phy_to_host(iphy)->id, iphy->phy_index, \
 669                 phy_state_name(state), phy_event_name(code), code)
 670
 671
 672 void scu_link_layer_set_txcomsas_timeout(struct isci_phy *iphy, u32 timeout)
 673 {
 674         u32 val;
 675
 676         /* Extend timeout */
 677         val = readl(&iphy->link_layer_registers->transmit_comsas_signal);
 678         val &= ~SCU_SAS_LLTXCOMSAS_GEN_VAL(NEGTIME, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_MASK);
 679         val |= SCU_SAS_LLTXCOMSAS_GEN_VAL(NEGTIME, timeout);
 680
 681         writel(val, &iphy->link_layer_registers->transmit_comsas_signal);
 682 }
 683
 684 enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
 685 {
 686         enum sci_phy_states state = iphy->sm.current_state_id;
 687
 688         switch (state) {
 689         case SCI_PHY_SUB_AWAIT_OSSP_EN:
 690                 switch (scu_get_event_code(event_code)) {
 691                 case SCU_EVENT_SAS_PHY_DETECTED:
 692                         sci_phy_start_sas_link_training(iphy);
 693                         iphy->is_in_link_training = true;
 694                         break;
 695                 case SCU_EVENT_SATA_SPINUP_HOLD:
 696                         sci_phy_start_sata_link_training(iphy);
 697                         iphy->is_in_link_training = true;
 698                         break;
 699                 case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
 700                        /* Extend timeout value */
 701                        scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
 702
 703                        /* Start the oob/sn state machine over again */
 704                        sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 705                        break;
 706                 default:
 707                         phy_event_dbg(iphy, state, event_code);
 708                         return SCI_FAILURE;
 709                 }
 710                 return SCI_SUCCESS;
 711         case SCI_PHY_SUB_AWAIT_SAS_SPEED_EN:
 712                 switch (scu_get_event_code(event_code)) {
 713                 case SCU_EVENT_SAS_PHY_DETECTED:
 714                         /*
 715                          * Why is this being reported again by the controller?
 716                          * We would re-enter this state so just stay here */
 717                         break;
 718                 case SCU_EVENT_SAS_15:
 719                 case SCU_EVENT_SAS_15_SSC:
 720                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_1_5_GBPS,
 721                                                        SCI_PHY_SUB_AWAIT_IAF_UF);
 722                         break;
 723                 case SCU_EVENT_SAS_30:
 724                 case SCU_EVENT_SAS_30_SSC:
 725                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_3_0_GBPS,
 726                                                        SCI_PHY_SUB_AWAIT_IAF_UF);
 727                         break;
 728                 case SCU_EVENT_SAS_60:
 729                 case SCU_EVENT_SAS_60_SSC:
 730                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_6_0_GBPS,
 731                                                        SCI_PHY_SUB_AWAIT_IAF_UF);
 732                         break;
 733                 case SCU_EVENT_SATA_SPINUP_HOLD:
 734                         /*
 735                          * We were doing SAS PHY link training and received a SATA PHY event
 736                          * continue OOB/SN as if this were a SATA PHY */
 737                         sci_phy_start_sata_link_training(iphy);
 738                         break;
 739                 case SCU_EVENT_LINK_FAILURE:
 740                         /* Change the timeout value to default */
 741                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 742
 743                         /* Link failure change state back to the starting state */
 744                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 745                         break;
 746                 case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
 747                        /* Extend the timeout value */
 748                        scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
 749
 750                        /* Start the oob/sn state machine over again */
 751                        sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 752                        break;
 753                 default:
 754                         phy_event_warn(iphy, state, event_code);
 755                         return SCI_FAILURE;
 756                         break;
 757                 }
 758                 return SCI_SUCCESS;
 759         case SCI_PHY_SUB_AWAIT_IAF_UF:
 760                 switch (scu_get_event_code(event_code)) {
 761                 case SCU_EVENT_SAS_PHY_DETECTED:
 762                         /* Backup the state machine */
 763                         sci_phy_start_sas_link_training(iphy);
 764                         break;
 765                 case SCU_EVENT_SATA_SPINUP_HOLD:
 766                         /* We were doing SAS PHY link training and received a
 767                          * SATA PHY event continue OOB/SN as if this were a
 768                          * SATA PHY
 769                          */
 770                         sci_phy_start_sata_link_training(iphy);
 771                         break;
 772                 case SCU_EVENT_RECEIVED_IDENTIFY_TIMEOUT:
 773                         /* Extend the timeout value */
 774                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_EXTENDED);
 775
 776                         /* Start the oob/sn state machine over again */
 777                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 778                         break;
 779                 case SCU_EVENT_LINK_FAILURE:
 780                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 781                 case SCU_EVENT_HARD_RESET_RECEIVED:
 782                         /* Start the oob/sn state machine over again */
 783                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 784                         break;
 785                 default:
 786                         phy_event_warn(iphy, state, event_code);
 787                         return SCI_FAILURE;
 788                 }
 789                 return SCI_SUCCESS;
 790         case SCI_PHY_SUB_AWAIT_SAS_POWER:
 791                 switch (scu_get_event_code(event_code)) {
 792                 case SCU_EVENT_LINK_FAILURE:
 793                         /* Change the timeout value to default */
 794                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 795
 796                         /* Link failure change state back to the starting state */
 797                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 798                         break;
 799                 default:
 800                         phy_event_warn(iphy, state, event_code);
 801                         return SCI_FAILURE;
 802                 }
 803                 return SCI_SUCCESS;
 804         case SCI_PHY_SUB_AWAIT_SATA_POWER:
 805                 switch (scu_get_event_code(event_code)) {
 806                 case SCU_EVENT_LINK_FAILURE:
 807                         /* Change the timeout value to default */
 808                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 809
 810                         /* Link failure change state back to the starting state */
 811                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 812                         break;
 813                 case SCU_EVENT_SATA_SPINUP_HOLD:
 814                         /* These events are received every 10ms and are
 815                          * expected while in this state
 816                          */
 817                         break;
 818
 819                 case SCU_EVENT_SAS_PHY_DETECTED:
 820                         /* There has been a change in the phy type before OOB/SN for the
 821                          * SATA finished start down the SAS link traning path.
 822                          */
 823                         sci_phy_start_sas_link_training(iphy);
 824                         break;
 825
 826                 default:
 827                         phy_event_warn(iphy, state, event_code);
 828                         return SCI_FAILURE;
 829                 }
 830                 return SCI_SUCCESS;
 831         case SCI_PHY_SUB_AWAIT_SATA_PHY_EN:
 832                 switch (scu_get_event_code(event_code)) {
 833                 case SCU_EVENT_LINK_FAILURE:
 834                         /* Change the timeout value to default */
 835                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 836
 837                         /* Link failure change state back to the starting state */
 838                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 839                         break;
 840                 case SCU_EVENT_SATA_SPINUP_HOLD:
 841                         /* These events might be received since we dont know how many may be in
 842                          * the completion queue while waiting for power
 843                          */
 844                         break;
 845                 case SCU_EVENT_SATA_PHY_DETECTED:
 846                         iphy->protocol = SAS_PROTOCOL_SATA;
 847
 848                         /* We have received the SATA PHY notification change state */
 849                         sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_SATA_SPEED_EN);
 850                         break;
 851                 case SCU_EVENT_SAS_PHY_DETECTED:
 852                         /* There has been a change in the phy type before OOB/SN for the
 853                          * SATA finished start down the SAS link traning path.
 854                          */
 855                         sci_phy_start_sas_link_training(iphy);
 856                         break;
 857                 default:
 858                         phy_event_warn(iphy, state, event_code);
 859                         return SCI_FAILURE;
 860                 }
 861                 return SCI_SUCCESS;
 862         case SCI_PHY_SUB_AWAIT_SATA_SPEED_EN:
 863                 switch (scu_get_event_code(event_code)) {
 864                 case SCU_EVENT_SATA_PHY_DETECTED:
 865                         /*
 866                          * The hardware reports multiple SATA PHY detected events
 867                          * ignore the extras */
 868                         break;
 869                 case SCU_EVENT_SATA_15:
 870                 case SCU_EVENT_SATA_15_SSC:
 871                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_1_5_GBPS,
 872                                                        SCI_PHY_SUB_AWAIT_SIG_FIS_UF);
 873                         break;
 874                 case SCU_EVENT_SATA_30:
 875                 case SCU_EVENT_SATA_30_SSC:
 876                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_3_0_GBPS,
 877                                                        SCI_PHY_SUB_AWAIT_SIG_FIS_UF);
 878                         break;
 879                 case SCU_EVENT_SATA_60:
 880                 case SCU_EVENT_SATA_60_SSC:
 881                         sci_phy_complete_link_training(iphy, SAS_LINK_RATE_6_0_GBPS,
 882                                                        SCI_PHY_SUB_AWAIT_SIG_FIS_UF);
 883                         break;
 884                 case SCU_EVENT_LINK_FAILURE:
 885                         /* Change the timeout value to default */
 886                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 887
 888                         /* Link failure change state back to the starting state */
 889                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 890                         break;
 891                 case SCU_EVENT_SAS_PHY_DETECTED:
 892                         /*
 893                          * There has been a change in the phy type before OOB/SN for the
 894                          * SATA finished start down the SAS link traning path. */
 895                         sci_phy_start_sas_link_training(iphy);
 896                         break;
 897                 default:
 898                         phy_event_warn(iphy, state, event_code);
 899                         return SCI_FAILURE;
 900                 }
 901
 902                 return SCI_SUCCESS;
 903         case SCI_PHY_SUB_AWAIT_SIG_FIS_UF:
 904                 switch (scu_get_event_code(event_code)) {
 905                 case SCU_EVENT_SATA_PHY_DETECTED:
 906                         /* Backup the state machine */
 907                         sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_SATA_SPEED_EN);
 908                         break;
 909
 910                 case SCU_EVENT_LINK_FAILURE:
 911                         /* Change the timeout value to default */
 912                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 913
 914                         /* Link failure change state back to the starting state */
 915                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 916                         break;
 917
 918                 default:
 919                         phy_event_warn(iphy, state, event_code);
 920                         return SCI_FAILURE;
 921                 }
 922                 return SCI_SUCCESS;
 923         case SCI_PHY_READY:
 924                 switch (scu_get_event_code(event_code)) {
 925                 case SCU_EVENT_LINK_FAILURE:
 926                         /* Set default timeout */
 927                         scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
 928
 929                         /* Link failure change state back to the starting state */
 930                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 931                         break;
 932                 case SCU_EVENT_BROADCAST_CHANGE:
 933                 case SCU_EVENT_BROADCAST_SES:
 934                 case SCU_EVENT_BROADCAST_RESERVED0:
 935                 case SCU_EVENT_BROADCAST_RESERVED1:
 936                 case SCU_EVENT_BROADCAST_EXPANDER:
 937                 case SCU_EVENT_BROADCAST_AEN:
 938                         /* Broadcast change received. Notify the port. */
 939                         if (phy_get_non_dummy_port(iphy) != NULL)
 940                                 sci_port_broadcast_change_received(iphy->owning_port, iphy);
 941                         else
 942                                 iphy->bcn_received_while_port_unassigned = true;
 943                         break;
 944                 case SCU_EVENT_BROADCAST_RESERVED3:
 945                 case SCU_EVENT_BROADCAST_RESERVED4:
 946                 default:
 947                         phy_event_warn(iphy, state, event_code);
 948                         return SCI_FAILURE_INVALID_STATE;
 949                 }
 950                 return SCI_SUCCESS;
 951         case SCI_PHY_RESETTING:
 952                 switch (scu_get_event_code(event_code)) {
 953                 case SCU_EVENT_HARD_RESET_TRANSMITTED:
 954                         /* Link failure change state back to the starting state */
 955                         sci_change_state(&iphy->sm, SCI_PHY_STARTING);
 956                         break;
 957                 default:
 958                         phy_event_warn(iphy, state, event_code);
 959                         return SCI_FAILURE_INVALID_STATE;
 960                         break;
 961                 }
 962                 return SCI_SUCCESS;
 963         default:
 964                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
 965                         __func__, phy_state_name(state));
 966                 return SCI_FAILURE_INVALID_STATE;
 967         }
 968 }
 969
 970 enum sci_status sci_phy_frame_handler(struct isci_phy *iphy, u32 frame_index)
 971 {
 972         enum sci_phy_states state = iphy->sm.current_state_id;
 973         struct isci_host *ihost = iphy->owning_port->owning_controller;
 974         enum sci_status result;
 975         unsigned long flags;
 976
 977         switch (state) {
 978         case SCI_PHY_SUB_AWAIT_IAF_UF: {
 979                 u32 *frame_words;
 980                 struct sas_identify_frame iaf;
 981
 982                 result = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
 983                                                                   frame_index,
 984                                                                   (void **)&frame_words);
 985
 986                 if (result != SCI_SUCCESS)
 987                         return result;
 988
 989                 sci_swab32_cpy(&iaf, frame_words, sizeof(iaf) / sizeof(u32));
 990                 if (iaf.frame_type == 0) {
 991                         u32 state;
 992
 993                         spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
 994                         memcpy(&iphy->frame_rcvd.iaf, &iaf, sizeof(iaf));
 995                         spin_unlock_irqrestore(&iphy->sas_phy.frame_rcvd_lock, flags);
 996                         if (iaf.smp_tport) {
 997                                 /* We got the IAF for an expander PHY go to the final
 998                                  * state since there are no power requirements for
 999                                  * expander phys.
1000                                  */
1001                                 state = SCI_PHY_SUB_FINAL;
1002                         } else {
1003                                 /* We got the IAF we can now go to the await spinup
1004                                  * semaphore state
1005                                  */
1006                                 state = SCI_PHY_SUB_AWAIT_SAS_POWER;
1007                         }
1008                         sci_change_state(&iphy->sm, state);
1009                         result = SCI_SUCCESS;
1010                 } else
1011                         dev_warn(sciphy_to_dev(iphy),
1012                                 "%s: PHY starting substate machine received "
1013                                 "unexpected frame id %x\n",
1014                                 __func__, frame_index);
1015
1016                 sci_controller_release_frame(ihost, frame_index);
1017                 return result;
1018         }
1019         case SCI_PHY_SUB_AWAIT_SIG_FIS_UF: {
1020                 struct dev_to_host_fis *frame_header;
1021                 u32 *fis_frame_data;
1022
1023                 result = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
1024                                                                   frame_index,
1025                                                                   (void **)&frame_header);
1026
1027                 if (result != SCI_SUCCESS)
1028                         return result;
1029
1030                 if ((frame_header->fis_type == FIS_REGD2H) &&
1031                     !(frame_header->status & ATA_BUSY)) {
1032                         sci_unsolicited_frame_control_get_buffer(&ihost->uf_control,
1033                                                                  frame_index,
1034                                                                  (void **)&fis_frame_data);
1035
1036                         spin_lock_irqsave(&iphy->sas_phy.frame_rcvd_lock, flags);
1037                         sci_controller_copy_sata_response(&iphy->frame_rcvd.fis,
1038                                                           frame_header,
1039                                                           fis_frame_data);
1040                         spin_unlock_irqrestore(&iphy->sas_phy.frame_rcvd_lock, flags);
1041
1042                         /* got IAF we can now go to the await spinup semaphore state */
1043                         sci_change_state(&iphy->sm, SCI_PHY_SUB_FINAL);
1044
1045                         result = SCI_SUCCESS;
1046                 } else
1047                         dev_warn(sciphy_to_dev(iphy),
1048                                  "%s: PHY starting substate machine received "
1049                                  "unexpected frame id %x\n",
1050                                  __func__, frame_index);
1051
1052                 /* Regardless of the result we are done with this frame with it */
1053                 sci_controller_release_frame(ihost, frame_index);
1054
1055                 return result;
1056         }
1057         default:
1058                 dev_dbg(sciphy_to_dev(iphy), "%s: in wrong state: %s\n",
1059                         __func__, phy_state_name(state));
1060                 return SCI_FAILURE_INVALID_STATE;
1061         }
1062
1063 }
1064
1065 static void sci_phy_starting_initial_substate_enter(struct sci_base_state_machine *sm)
1066 {
1067         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1068
1069         /* This is just an temporary state go off to the starting state */
1070         sci_change_state(&iphy->sm, SCI_PHY_SUB_AWAIT_OSSP_EN);
1071 }
1072
1073 static void sci_phy_starting_await_sas_power_substate_enter(struct sci_base_state_machine *sm)
1074 {
1075         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1076         struct isci_host *ihost = iphy->owning_port->owning_controller;
1077
1078         sci_controller_power_control_queue_insert(ihost, iphy);
1079 }
1080
1081 static void sci_phy_starting_await_sas_power_substate_exit(struct sci_base_state_machine *sm)
1082 {
1083         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1084         struct isci_host *ihost = iphy->owning_port->owning_controller;
1085
1086         sci_controller_power_control_queue_remove(ihost, iphy);
1087 }
1088
1089 static void sci_phy_starting_await_sata_power_substate_enter(struct sci_base_state_machine *sm)
1090 {
1091         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1092         struct isci_host *ihost = iphy->owning_port->owning_controller;
1093
1094         sci_controller_power_control_queue_insert(ihost, iphy);
1095 }
1096
1097 static void sci_phy_starting_await_sata_power_substate_exit(struct sci_base_state_machine *sm)
1098 {
1099         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1100         struct isci_host *ihost = iphy->owning_port->owning_controller;
1101
1102         sci_controller_power_control_queue_remove(ihost, iphy);
1103 }
1104
1105 static void sci_phy_starting_await_sata_phy_substate_enter(struct sci_base_state_machine *sm)
1106 {
1107         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1108
1109         sci_mod_timer(&iphy->sata_timer, SCIC_SDS_SATA_LINK_TRAINING_TIMEOUT);
1110 }
1111
1112 static void sci_phy_starting_await_sata_phy_substate_exit(struct sci_base_state_machine *sm)
1113 {
1114         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1115
1116         sci_del_timer(&iphy->sata_timer);
1117 }
1118
1119 static void sci_phy_starting_await_sata_speed_substate_enter(struct sci_base_state_machine *sm)
1120 {
1121         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1122
1123         sci_mod_timer(&iphy->sata_timer, SCIC_SDS_SATA_LINK_TRAINING_TIMEOUT);
1124 }
1125
1126 static void sci_phy_starting_await_sata_speed_substate_exit(struct sci_base_state_machine *sm)
1127 {
1128         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1129
1130         sci_del_timer(&iphy->sata_timer);
1131 }
1132
1133 static void sci_phy_starting_await_sig_fis_uf_substate_enter(struct sci_base_state_machine *sm)
1134 {
1135         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1136
1137         if (sci_port_link_detected(iphy->owning_port, iphy)) {
1138
1139                 /*
1140                  * Clear the PE suspend condition so we can actually
1141                  * receive SIG FIS
1142                  * The hardware will not respond to the XRDY until the PE
1143                  * suspend condition is cleared.
1144                  */
1145                 sci_phy_resume(iphy);
1146
1147                 sci_mod_timer(&iphy->sata_timer,
1148                               SCIC_SDS_SIGNATURE_FIS_TIMEOUT);
1149         } else
1150                 iphy->is_in_link_training = false;
1151 }
1152
1153 static void sci_phy_starting_await_sig_fis_uf_substate_exit(struct sci_base_state_machine *sm)
1154 {
1155         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1156
1157         sci_del_timer(&iphy->sata_timer);
1158 }
1159
1160 static void sci_phy_starting_final_substate_enter(struct sci_base_state_machine *sm)
1161 {
1162         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1163
1164         /* State machine has run to completion so exit out and change
1165          * the base state machine to the ready state
1166          */
1167         sci_change_state(&iphy->sm, SCI_PHY_READY);
1168 }
1169
1170 /**
1171  *
1172  * @sci_phy: This is the struct isci_phy object to stop.
1173  *
1174  * This method will stop the struct isci_phy object. This does not reset the
1175  * protocol engine it just suspends it and places it in a state where it will
1176  * not cause the end device to power up. none
1177  */
1178 static void scu_link_layer_stop_protocol_engine(
1179         struct isci_phy *iphy)
1180 {
1181         u32 scu_sas_pcfg_value;
1182         u32 enable_spinup_value;
1183
1184         /* Suspend the protocol engine and place it in a sata spinup hold state */
1185         scu_sas_pcfg_value =
1186                 readl(&iphy->link_layer_registers->phy_configuration);
1187         scu_sas_pcfg_value |=
1188                 (SCU_SAS_PCFG_GEN_BIT(OOB_RESET) |
1189                  SCU_SAS_PCFG_GEN_BIT(SUSPEND_PROTOCOL_ENGINE) |
1190                  SCU_SAS_PCFG_GEN_BIT(SATA_SPINUP_HOLD));
1191         writel(scu_sas_pcfg_value,
1192                &iphy->link_layer_registers->phy_configuration);
1193
1194         /* Disable the notify enable spinup primitives */
1195         enable_spinup_value = readl(&iphy->link_layer_registers->notify_enable_spinup_control);
1196         enable_spinup_value &= ~SCU_ENSPINUP_GEN_BIT(ENABLE);
1197         writel(enable_spinup_value, &iphy->link_layer_registers->notify_enable_spinup_control);
1198 }
1199
1200 static void scu_link_layer_start_oob(struct isci_phy *iphy)
1201 {
1202         struct scu_link_layer_registers __iomem *ll = iphy->link_layer_registers;
1203         u32 val;
1204
1205         /** Reset OOB sequence - start */
1206         val = readl(&ll->phy_configuration);
1207         val &= ~(SCU_SAS_PCFG_GEN_BIT(OOB_RESET) |
1208                  SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE) |
1209                  SCU_SAS_PCFG_GEN_BIT(HARD_RESET));
1210         writel(val, &ll->phy_configuration);
1211         readl(&ll->phy_configuration); /* flush */
1212         /** Reset OOB sequence - end */
1213
1214         /** Start OOB sequence - start */
1215         val = readl(&ll->phy_configuration);
1216         val |= SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE);
1217         writel(val, &ll->phy_configuration);
1218         readl(&ll->phy_configuration); /* flush */
1219         /** Start OOB sequence - end */
1220 }
1221
1222 /**
1223  *
1224  *
1225  * This method will transmit a hard reset request on the specified phy. The SCU
1226  * hardware requires that we reset the OOB state machine and set the hard reset
1227  * bit in the phy configuration register. We then must start OOB over with the
1228  * hard reset bit set.
1229  */
1230 static void scu_link_layer_tx_hard_reset(
1231         struct isci_phy *iphy)
1232 {
1233         u32 phy_configuration_value;
1234
1235         /*
1236          * SAS Phys must wait for the HARD_RESET_TX event notification to transition
1237          * to the starting state. */
1238         phy_configuration_value =
1239                 readl(&iphy->link_layer_registers->phy_configuration);
1240         phy_configuration_value &= ~(SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE));
1241         phy_configuration_value |=
1242                 (SCU_SAS_PCFG_GEN_BIT(HARD_RESET) |
1243                  SCU_SAS_PCFG_GEN_BIT(OOB_RESET));
1244         writel(phy_configuration_value,
1245                &iphy->link_layer_registers->phy_configuration);
1246
1247         /* Now take the OOB state machine out of reset */
1248         phy_configuration_value |= SCU_SAS_PCFG_GEN_BIT(OOB_ENABLE);
1249         phy_configuration_value &= ~SCU_SAS_PCFG_GEN_BIT(OOB_RESET);
1250         writel(phy_configuration_value,
1251                &iphy->link_layer_registers->phy_configuration);
1252 }
1253
1254 static void sci_phy_stopped_state_enter(struct sci_base_state_machine *sm)
1255 {
1256         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1257         struct isci_port *iport = iphy->owning_port;
1258         struct isci_host *ihost = iport->owning_controller;
1259
1260         /*
1261          * @todo We need to get to the controller to place this PE in a
1262          * reset state
1263          */
1264         sci_del_timer(&iphy->sata_timer);
1265
1266         scu_link_layer_stop_protocol_engine(iphy);
1267
1268         if (iphy->sm.previous_state_id != SCI_PHY_INITIAL)
1269                 sci_controller_link_down(ihost, phy_get_non_dummy_port(iphy), iphy);
1270 }
1271
1272 static void sci_phy_starting_state_enter(struct sci_base_state_machine *sm)
1273 {
1274         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1275         struct isci_port *iport = iphy->owning_port;
1276         struct isci_host *ihost = iport->owning_controller;
1277
1278         scu_link_layer_stop_protocol_engine(iphy);
1279         scu_link_layer_start_oob(iphy);
1280
1281         /* We don't know what kind of phy we are going to be just yet */
1282         iphy->protocol = SAS_PROTOCOL_NONE;
1283         iphy->bcn_received_while_port_unassigned = false;
1284
1285         if (iphy->sm.previous_state_id == SCI_PHY_READY)
1286                 sci_controller_link_down(ihost, phy_get_non_dummy_port(iphy), iphy);
1287
1288         sci_change_state(&iphy->sm, SCI_PHY_SUB_INITIAL);
1289 }
1290
1291 static void sci_phy_ready_state_enter(struct sci_base_state_machine *sm)
1292 {
1293         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1294         struct isci_port *iport = iphy->owning_port;
1295         struct isci_host *ihost = iport->owning_controller;
1296
1297         sci_controller_link_up(ihost, phy_get_non_dummy_port(iphy), iphy);
1298 }
1299
1300 static void sci_phy_ready_state_exit(struct sci_base_state_machine *sm)
1301 {
1302         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1303
1304         sci_phy_suspend(iphy);
1305 }
1306
1307 static void sci_phy_resetting_state_enter(struct sci_base_state_machine *sm)
1308 {
1309         struct isci_phy *iphy = container_of(sm, typeof(*iphy), sm);
1310
1311         /* The phy is being reset, therefore deactivate it from the port.  In
1312          * the resetting state we don't notify the user regarding link up and
1313          * link down notifications
1314          */
1315         sci_port_deactivate_phy(iphy->owning_port, iphy, false);
1316
1317         if (iphy->protocol == SAS_PROTOCOL_SSP) {
1318                 scu_link_layer_tx_hard_reset(iphy);
1319         } else {
1320                 /* The SCU does not need to have a discrete reset state so
1321                  * just go back to the starting state.
1322                  */
1323                 sci_change_state(&iphy->sm, SCI_PHY_STARTING);
1324         }
1325 }
1326
1327 static const struct sci_base_state sci_phy_state_table[] = {
1328         [SCI_PHY_INITIAL] = { },
1329         [SCI_PHY_STOPPED] = {
1330                 .enter_state = sci_phy_stopped_state_enter,
1331         },
1332         [SCI_PHY_STARTING] = {
1333                 .enter_state = sci_phy_starting_state_enter,
1334         },
1335         [SCI_PHY_SUB_INITIAL] = {
1336                 .enter_state = sci_phy_starting_initial_substate_enter,
1337         },
1338         [SCI_PHY_SUB_AWAIT_OSSP_EN] = { },
1339         [SCI_PHY_SUB_AWAIT_SAS_SPEED_EN] = { },
1340         [SCI_PHY_SUB_AWAIT_IAF_UF] = { },
1341         [SCI_PHY_SUB_AWAIT_SAS_POWER] = {
1342                 .enter_state = sci_phy_starting_await_sas_power_substate_enter,
1343                 .exit_state  = sci_phy_starting_await_sas_power_substate_exit,
1344         },
1345         [SCI_PHY_SUB_AWAIT_SATA_POWER] = {
1346                 .enter_state = sci_phy_starting_await_sata_power_substate_enter,
1347                 .exit_state  = sci_phy_starting_await_sata_power_substate_exit
1348         },
1349         [SCI_PHY_SUB_AWAIT_SATA_PHY_EN] = {
1350                 .enter_state = sci_phy_starting_await_sata_phy_substate_enter,
1351                 .exit_state  = sci_phy_starting_await_sata_phy_substate_exit
1352         },
1353         [SCI_PHY_SUB_AWAIT_SATA_SPEED_EN] = {
1354                 .enter_state = sci_phy_starting_await_sata_speed_substate_enter,
1355                 .exit_state  = sci_phy_starting_await_sata_speed_substate_exit
1356         },
1357         [SCI_PHY_SUB_AWAIT_SIG_FIS_UF] = {
1358                 .enter_state = sci_phy_starting_await_sig_fis_uf_substate_enter,
1359                 .exit_state  = sci_phy_starting_await_sig_fis_uf_substate_exit
1360         },
1361         [SCI_PHY_SUB_FINAL] = {
1362                 .enter_state = sci_phy_starting_final_substate_enter,
1363         },
1364         [SCI_PHY_READY] = {
1365                 .enter_state = sci_phy_ready_state_enter,
1366                 .exit_state = sci_phy_ready_state_exit,
1367         },
1368         [SCI_PHY_RESETTING] = {
1369                 .enter_state = sci_phy_resetting_state_enter,
1370         },
1371         [SCI_PHY_FINAL] = { },
1372 };
1373
1374 void sci_phy_construct(struct isci_phy *iphy,
1375                             struct isci_port *iport, u8 phy_index)
1376 {
1377         sci_init_sm(&iphy->sm, sci_phy_state_table, SCI_PHY_INITIAL);
1378
1379         /* Copy the rest of the input data to our locals */
1380         iphy->owning_port = iport;
1381         iphy->phy_index = phy_index;
1382         iphy->bcn_received_while_port_unassigned = false;
1383         iphy->protocol = SAS_PROTOCOL_NONE;
1384         iphy->link_layer_registers = NULL;
1385         iphy->max_negotiated_speed = SAS_LINK_RATE_UNKNOWN;
1386
1387         /* Create the SIGNATURE FIS Timeout timer for this phy */
1388         sci_init_timer(&iphy->sata_timer, phy_sata_timeout);
1389 }
1390
1391 void isci_phy_init(struct isci_phy *iphy, struct isci_host *ihost, int index)
1392 {
1393         struct sci_oem_params *oem = &ihost->oem_parameters;
1394         u64 sci_sas_addr;
1395         __be64 sas_addr;
1396
1397         sci_sas_addr = oem->phys[index].sas_address.high;
1398         sci_sas_addr <<= 32;
1399         sci_sas_addr |= oem->phys[index].sas_address.low;
1400         sas_addr = cpu_to_be64(sci_sas_addr);
1401         memcpy(iphy->sas_addr, &sas_addr, sizeof(sas_addr));
1402
1403         iphy->sas_phy.enabled = 0;
1404         iphy->sas_phy.id = index;
1405         iphy->sas_phy.sas_addr = &iphy->sas_addr[0];
1406         iphy->sas_phy.frame_rcvd = (u8 *)&iphy->frame_rcvd;
1407         iphy->sas_phy.ha = &ihost->sas_ha;
1408         iphy->sas_phy.lldd_phy = iphy;
1409         iphy->sas_phy.enabled = 1;
1410         iphy->sas_phy.class = SAS;
1411         iphy->sas_phy.iproto = SAS_PROTOCOL_ALL;
1412         iphy->sas_phy.tproto = 0;
1413         iphy->sas_phy.type = PHY_TYPE_PHYSICAL;
1414         iphy->sas_phy.role = PHY_ROLE_INITIATOR;
1415         iphy->sas_phy.oob_mode = OOB_NOT_CONNECTED;
1416         iphy->sas_phy.linkrate = SAS_LINK_RATE_UNKNOWN;
1417         memset(&iphy->frame_rcvd, 0, sizeof(iphy->frame_rcvd));
1418 }
1419
1420
1421 /**
1422  * isci_phy_control() - This function is one of the SAS Domain Template
1423  *    functions. This is a phy management function.
1424  * @phy: This parameter specifies the sphy being controlled.
1425  * @func: This parameter specifies the phy control function being invoked.
1426  * @buf: This parameter is specific to the phy function being invoked.
1427  *
1428  * status, zero indicates success.
1429  */
1430 int isci_phy_control(struct asd_sas_phy *sas_phy,
1431                      enum phy_func func,
1432                      void *buf)
1433 {
1434         int ret = 0;
1435         struct isci_phy *iphy = sas_phy->lldd_phy;
1436         struct asd_sas_port *port = sas_phy->port;
1437         struct isci_host *ihost = sas_phy->ha->lldd_ha;
1438         unsigned long flags;
1439
1440         dev_dbg(&ihost->pdev->dev,
1441                 "%s: phy %p; func %d; buf %p; isci phy %p, port %p\n",
1442                 __func__, sas_phy, func, buf, iphy, port);
1443
1444         switch (func) {
1445         case PHY_FUNC_DISABLE:
1446                 spin_lock_irqsave(&ihost->scic_lock, flags);
1447                 scu_link_layer_start_oob(iphy);
1448                 sci_phy_stop(iphy);
1449                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1450                 break;
1451
1452         case PHY_FUNC_LINK_RESET:
1453                 spin_lock_irqsave(&ihost->scic_lock, flags);
1454                 scu_link_layer_start_oob(iphy);
1455                 sci_phy_stop(iphy);
1456                 sci_phy_start(iphy);
1457                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1458                 break;
1459
1460         case PHY_FUNC_HARD_RESET:
1461                 if (!port)
1462                         return -ENODEV;
1463
1464                 ret = isci_port_perform_hard_reset(ihost, port->lldd_port, iphy);
1465
1466                 break;
1467         case PHY_FUNC_GET_EVENTS: {
1468                 struct scu_link_layer_registers __iomem *r;
1469                 struct sas_phy *phy = sas_phy->phy;
1470
1471                 r = iphy->link_layer_registers;
1472                 phy->running_disparity_error_count = readl(&r->running_disparity_error_count);
1473                 phy->loss_of_dword_sync_count = readl(&r->loss_of_sync_error_count);
1474                 phy->phy_reset_problem_count = readl(&r->phy_reset_problem_count);
1475                 phy->invalid_dword_count = readl(&r->invalid_dword_counter);
1476                 break;
1477         }
1478
1479         default:
1480                 dev_dbg(&ihost->pdev->dev,
1481                            "%s: phy %p; func %d NOT IMPLEMENTED!\n",
1482                            __func__, sas_phy, func);
1483                 ret = -ENOSYS;
1484                 break;
1485         }
1486         return ret;
1487 }