drivers/scsi/ufs/ufshcd.h

   1 /*
   2  * Universal Flash Storage Host controller driver
   3  *
   4  * This code is based on drivers/scsi/ufs/ufshcd.h
   5  * Copyright (C) 2011-2013 Samsung India Software Operations
   6  *
   7  * Authors:
   8  *      Santosh Yaraganavi <santosh.sy@samsung.com>
   9  *      Vinayak Holikatti <h.vinayak@samsung.com>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  * See the COPYING file in the top-level directory or visit
  16  * <http://www.gnu.org/licenses/gpl-2.0.html>
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * This program is provided "AS IS" and "WITH ALL FAULTS" and
  24  * without warranty of any kind. You are solely responsible for
  25  * determining the appropriateness of using and distributing
  26  * the program and assume all risks associated with your exercise
  27  * of rights with respect to the program, including but not limited
  28  * to infringement of third party rights, the risks and costs of
  29  * program errors, damage to or loss of data, programs or equipment,
  30  * and unavailability or interruption of operations. Under no
  31  * circumstances will the contributor of this Program be liable for
  32  * any damages of any kind arising from your use or distribution of
  33  * this program.
  34  */
  35
  36 #ifndef _UFSHCD_H
  37 #define _UFSHCD_H
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/init.h>
  42 #include <linux/interrupt.h>
  43 #include <linux/io.h>
  44 #include <linux/delay.h>
  45 #include <linux/slab.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/workqueue.h>
  48 #include <linux/errno.h>
  49 #include <linux/types.h>
  50 #include <linux/wait.h>
  51 #include <linux/bitops.h>
  52 #include <linux/pm_runtime.h>
  53 #include <linux/clk.h>
  54 #include <linux/completion.h>
  55 #include <linux/regulator/consumer.h>
  56
  57 #include <asm/irq.h>
  58 #include <asm/byteorder.h>
  59 #include <scsi/scsi.h>
  60 #include <scsi/scsi_cmnd.h>
  61 #include <scsi/scsi_host.h>
  62 #include <scsi/scsi_tcq.h>
  63 #include <scsi/scsi_dbg.h>
  64 #include <scsi/scsi_eh.h>
  65
  66 #include "ufs.h"
  67 #include "ufshci.h"
  68
  69 #define UFSHCD "ufshcd"
  70 #define UFSHCD_DRIVER_VERSION "0.2"
  71
  72 struct ufs_hba;
  73
  74 enum dev_cmd_type {
  75         DEV_CMD_TYPE_NOP                = 0x0,
  76         DEV_CMD_TYPE_QUERY              = 0x1,
  77 };
  78
  79 /**
  80  * struct uic_command - UIC command structure
  81  * @command: UIC command
  82  * @argument1: UIC command argument 1
  83  * @argument2: UIC command argument 2
  84  * @argument3: UIC command argument 3
  85  * @cmd_active: Indicate if UIC command is outstanding
  86  * @result: UIC command result
  87  * @done: UIC command completion
  88  */
  89 struct uic_command {
  90         u32 command;
  91         u32 argument1;
  92         u32 argument2;
  93         u32 argument3;
  94         int cmd_active;
  95         int result;
  96         struct completion done;
  97 };
  98
  99 /* Used to differentiate the power management options */
 100 enum ufs_pm_op {
 101         UFS_RUNTIME_PM,
 102         UFS_SYSTEM_PM,
 103         UFS_SHUTDOWN_PM,
 104 };
 105
 106 #define ufshcd_is_runtime_pm(op) ((op) == UFS_RUNTIME_PM)
 107 #define ufshcd_is_system_pm(op) ((op) == UFS_SYSTEM_PM)
 108 #define ufshcd_is_shutdown_pm(op) ((op) == UFS_SHUTDOWN_PM)
 109
 110 /* Host <-> Device UniPro Link state */
 111 enum uic_link_state {
 112         UIC_LINK_OFF_STATE      = 0, /* Link powered down or disabled */
 113         UIC_LINK_ACTIVE_STATE   = 1, /* Link is in Fast/Slow/Sleep state */
 114         UIC_LINK_HIBERN8_STATE  = 2, /* Link is in Hibernate state */
 115 };
 116
 117 #define ufshcd_is_link_off(hba) ((hba)->uic_link_state == UIC_LINK_OFF_STATE)
 118 #define ufshcd_is_link_active(hba) ((hba)->uic_link_state == \
 119                                     UIC_LINK_ACTIVE_STATE)
 120 #define ufshcd_is_link_hibern8(hba) ((hba)->uic_link_state == \
 121                                     UIC_LINK_HIBERN8_STATE)
 122 #define ufshcd_set_link_off(hba) ((hba)->uic_link_state = UIC_LINK_OFF_STATE)
 123 #define ufshcd_set_link_active(hba) ((hba)->uic_link_state = \
 124                                     UIC_LINK_ACTIVE_STATE)
 125 #define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \
 126                                     UIC_LINK_HIBERN8_STATE)
 127
 128 /*
 129  * UFS Power management levels.
 130  * Each level is in increasing order of power savings.
 131  */
 132 enum ufs_pm_level {
 133         UFS_PM_LVL_0, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE */
 134         UFS_PM_LVL_1, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE */
 135         UFS_PM_LVL_2, /* UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE */
 136         UFS_PM_LVL_3, /* UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE */
 137         UFS_PM_LVL_4, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE */
 138         UFS_PM_LVL_5, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE */
 139         UFS_PM_LVL_MAX
 140 };
 141
 142 struct ufs_pm_lvl_states {
 143         enum ufs_dev_pwr_mode dev_state;
 144         enum uic_link_state link_state;
 145 };
 146
 147 /**
 148  * struct ufshcd_lrb - local reference block
 149  * @utr_descriptor_ptr: UTRD address of the command
 150  * @ucd_req_ptr: UCD address of the command
 151  * @ucd_rsp_ptr: Response UPIU address for this command
 152  * @ucd_prdt_ptr: PRDT address of the command
 153  * @cmd: pointer to SCSI command
 154  * @sense_buffer: pointer to sense buffer address of the SCSI command
 155  * @sense_bufflen: Length of the sense buffer
 156  * @scsi_status: SCSI status of the command
 157  * @command_type: SCSI, UFS, Query.
 158  * @task_tag: Task tag of the command
 159  * @lun: LUN of the command
 160  * @intr_cmd: Interrupt command (doesn't participate in interrupt aggregation)
 161  */
 162 struct ufshcd_lrb {
 163         struct utp_transfer_req_desc *utr_descriptor_ptr;
 164         struct utp_upiu_req *ucd_req_ptr;
 165         struct utp_upiu_rsp *ucd_rsp_ptr;
 166         struct ufshcd_sg_entry *ucd_prdt_ptr;
 167
 168         struct scsi_cmnd *cmd;
 169         u8 *sense_buffer;
 170         unsigned int sense_bufflen;
 171         int scsi_status;
 172
 173         int command_type;
 174         int task_tag;
 175         u8 lun; /* UPIU LUN id field is only 8-bit wide */
 176         bool intr_cmd;
 177 };
 178
 179 /**
 180  * struct ufs_query - holds relevent data structures for query request
 181  * @request: request upiu and function
 182  * @descriptor: buffer for sending/receiving descriptor
 183  * @response: response upiu and response
 184  */
 185 struct ufs_query {
 186         struct ufs_query_req request;
 187         u8 *descriptor;
 188         struct ufs_query_res response;
 189 };
 190
 191 /**
 192  * struct ufs_dev_cmd - all assosiated fields with device management commands
 193  * @type: device management command type - Query, NOP OUT
 194  * @lock: lock to allow one command at a time
 195  * @complete: internal commands completion
 196  * @tag_wq: wait queue until free command slot is available
 197  */
 198 struct ufs_dev_cmd {
 199         enum dev_cmd_type type;
 200         struct mutex lock;
 201         struct completion *complete;
 202         wait_queue_head_t tag_wq;
 203         struct ufs_query query;
 204 };
 205
 206 /**
 207  * struct ufs_clk_info - UFS clock related info
 208  * @list: list headed by hba->clk_list_head
 209  * @clk: clock node
 210  * @name: clock name
 211  * @max_freq: maximum frequency supported by the clock
 212  * @min_freq: min frequency that can be used for clock scaling
 213  * @curr_freq: indicates the current frequency that it is set to
 214  * @enabled: variable to check against multiple enable/disable
 215  */
 216 struct ufs_clk_info {
 217         struct list_head list;
 218         struct clk *clk;
 219         const char *name;
 220         u32 max_freq;
 221         u32 min_freq;
 222         u32 curr_freq;
 223         bool enabled;
 224 };
 225
 226 #define PRE_CHANGE      0
 227 #define POST_CHANGE     1
 228
 229 struct ufs_pa_layer_attr {
 230         u32 gear_rx;
 231         u32 gear_tx;
 232         u32 lane_rx;
 233         u32 lane_tx;
 234         u32 pwr_rx;
 235         u32 pwr_tx;
 236         u32 hs_rate;
 237 };
 238
 239 struct ufs_pwr_mode_info {
 240         bool is_valid;
 241         struct ufs_pa_layer_attr info;
 242 };
 243
 244 /**
 245  * struct ufs_hba_variant_ops - variant specific callbacks
 246  * @name: variant name
 247  * @init: called when the driver is initialized
 248  * @exit: called to cleanup everything done in init
 249  * @clk_scale_notify: notifies that clks are scaled up/down
 250  * @setup_clocks: called before touching any of the controller registers
 251  * @setup_regulators: called before accessing the host controller
 252  * @hce_enable_notify: called before and after HCE enable bit is set to allow
 253  *                     variant specific Uni-Pro initialization.
 254  * @link_startup_notify: called before and after Link startup is carried out
 255  *                       to allow variant specific Uni-Pro initialization.
 256  * @pwr_change_notify: called before and after a power mode change
 257  *                      is carried out to allow vendor spesific capabilities
 258  *                      to be set.
 259  * @suspend: called during host controller PM callback
 260  * @resume: called during host controller PM callback
 261  */
 262 struct ufs_hba_variant_ops {
 263         const char *name;
 264         int     (*init)(struct ufs_hba *);
 265         void    (*exit)(struct ufs_hba *);
 266         void    (*clk_scale_notify)(struct ufs_hba *);
 267         int     (*setup_clocks)(struct ufs_hba *, bool);
 268         int     (*setup_regulators)(struct ufs_hba *, bool);
 269         int     (*hce_enable_notify)(struct ufs_hba *, bool);
 270         int     (*link_startup_notify)(struct ufs_hba *, bool);
 271         int     (*pwr_change_notify)(struct ufs_hba *,
 272                                         bool, struct ufs_pa_layer_attr *,
 273                                         struct ufs_pa_layer_attr *);
 274         int     (*suspend)(struct ufs_hba *, enum ufs_pm_op);
 275         int     (*resume)(struct ufs_hba *, enum ufs_pm_op);
 276 };
 277
 278 /* clock gating state  */
 279 enum clk_gating_state {
 280         CLKS_OFF,
 281         CLKS_ON,
 282         REQ_CLKS_OFF,
 283         REQ_CLKS_ON,
 284 };
 285
 286 /**
 287  * struct ufs_clk_gating - UFS clock gating related info
 288  * @gate_work: worker to turn off clocks after some delay as specified in
 289  * delay_ms
 290  * @ungate_work: worker to turn on clocks that will be used in case of
 291  * interrupt context
 292  * @state: the current clocks state
 293  * @delay_ms: gating delay in ms
 294  * @is_suspended: clk gating is suspended when set to 1 which can be used
 295  * during suspend/resume
 296  * @delay_attr: sysfs attribute to control delay_attr
 297  * @active_reqs: number of requests that are pending and should be waited for
 298  * completion before gating clocks.
 299  */
 300 struct ufs_clk_gating {
 301         struct delayed_work gate_work;
 302         struct work_struct ungate_work;
 303         enum clk_gating_state state;
 304         unsigned long delay_ms;
 305         bool is_suspended;
 306         struct device_attribute delay_attr;
 307         int active_reqs;
 308 };
 309
 310 struct ufs_clk_scaling {
 311         ktime_t  busy_start_t;
 312         bool is_busy_started;
 313         unsigned long  tot_busy_t;
 314         unsigned long window_start_t;
 315 };
 316
 317 /**
 318  * struct ufs_init_prefetch - contains data that is pre-fetched once during
 319  * initialization
 320  * @icc_level: icc level which was read during initialization
 321  */
 322 struct ufs_init_prefetch {
 323         u32 icc_level;
 324 };
 325
 326 /**
 327  * struct ufs_hba - per adapter private structure
 328  * @mmio_base: UFSHCI base register address
 329  * @ucdl_base_addr: UFS Command Descriptor base address
 330  * @utrdl_base_addr: UTP Transfer Request Descriptor base address
 331  * @utmrdl_base_addr: UTP Task Management Descriptor base address
 332  * @ucdl_dma_addr: UFS Command Descriptor DMA address
 333  * @utrdl_dma_addr: UTRDL DMA address
 334  * @utmrdl_dma_addr: UTMRDL DMA address
 335  * @host: Scsi_Host instance of the driver
 336  * @dev: device handle
 337  * @lrb: local reference block
 338  * @lrb_in_use: lrb in use
 339  * @outstanding_tasks: Bits representing outstanding task requests
 340  * @outstanding_reqs: Bits representing outstanding transfer requests
 341  * @capabilities: UFS Controller Capabilities
 342  * @nutrs: Transfer Request Queue depth supported by controller
 343  * @nutmrs: Task Management Queue depth supported by controller
 344  * @ufs_version: UFS Version to which controller complies
 345  * @vops: pointer to variant specific operations
 346  * @priv: pointer to variant specific private data
 347  * @irq: Irq number of the controller
 348  * @active_uic_cmd: handle of active UIC command
 349  * @uic_cmd_mutex: mutex for uic command
 350  * @tm_wq: wait queue for task management
 351  * @tm_tag_wq: wait queue for free task management slots
 352  * @tm_slots_in_use: bit map of task management request slots in use
 353  * @pwr_done: completion for power mode change
 354  * @tm_condition: condition variable for task management
 355  * @ufshcd_state: UFSHCD states
 356  * @eh_flags: Error handling flags
 357  * @intr_mask: Interrupt Mask Bits
 358  * @ee_ctrl_mask: Exception event control mask
 359  * @is_powered: flag to check if HBA is powered
 360  * @is_init_prefetch: flag to check if data was pre-fetched in initialization
 361  * @init_prefetch_data: data pre-fetched during initialization
 362  * @eh_work: Worker to handle UFS errors that require s/w attention
 363  * @eeh_work: Worker to handle exception events
 364  * @errors: HBA errors
 365  * @uic_error: UFS interconnect layer error status
 366  * @saved_err: sticky error mask
 367  * @saved_uic_err: sticky UIC error mask
 368  * @dev_cmd: ufs device management command information
 369  * @auto_bkops_enabled: to track whether bkops is enabled in device
 370  * @vreg_info: UFS device voltage regulator information
 371  * @clk_list_head: UFS host controller clocks list node head
 372  * @pwr_info: holds current power mode
 373  * @max_pwr_info: keeps the device max valid pwm
 374  */
 375 struct ufs_hba {
 376         void __iomem *mmio_base;
 377
 378         /* Virtual memory reference */
 379         struct utp_transfer_cmd_desc *ucdl_base_addr;
 380         struct utp_transfer_req_desc *utrdl_base_addr;
 381         struct utp_task_req_desc *utmrdl_base_addr;
 382
 383         /* DMA memory reference */
 384         dma_addr_t ucdl_dma_addr;
 385         dma_addr_t utrdl_dma_addr;
 386         dma_addr_t utmrdl_dma_addr;
 387
 388         struct Scsi_Host *host;
 389         struct device *dev;
 390         /*
 391          * This field is to keep a reference to "scsi_device" corresponding to
 392          * "UFS device" W-LU.
 393          */
 394         struct scsi_device *sdev_ufs_device;
 395
 396         enum ufs_dev_pwr_mode curr_dev_pwr_mode;
 397         enum uic_link_state uic_link_state;
 398         /* Desired UFS power management level during runtime PM */
 399         enum ufs_pm_level rpm_lvl;
 400         /* Desired UFS power management level during system PM */
 401         enum ufs_pm_level spm_lvl;
 402         int pm_op_in_progress;
 403
 404         struct ufshcd_lrb *lrb;
 405         unsigned long lrb_in_use;
 406
 407         unsigned long outstanding_tasks;
 408         unsigned long outstanding_reqs;
 409
 410         u32 capabilities;
 411         int nutrs;
 412         int nutmrs;
 413         u32 ufs_version;
 414         struct ufs_hba_variant_ops *vops;
 415         void *priv;
 416         unsigned int irq;
 417         bool is_irq_enabled;
 418
 419
 420         wait_queue_head_t tm_wq;
 421         wait_queue_head_t tm_tag_wq;
 422         unsigned long tm_condition;
 423         unsigned long tm_slots_in_use;
 424
 425         struct uic_command *active_uic_cmd;
 426         struct mutex uic_cmd_mutex;
 427         struct completion *uic_async_done;
 428
 429         u32 ufshcd_state;
 430         u32 eh_flags;
 431         u32 intr_mask;
 432         u16 ee_ctrl_mask;
 433         bool is_powered;
 434         bool is_init_prefetch;
 435         struct ufs_init_prefetch init_prefetch_data;
 436
 437         /* Work Queues */
 438         struct work_struct eh_work;
 439         struct work_struct eeh_work;
 440
 441         /* HBA Errors */
 442         u32 errors;
 443         u32 uic_error;
 444         u32 saved_err;
 445         u32 saved_uic_err;
 446
 447         /* Device management request data */
 448         struct ufs_dev_cmd dev_cmd;
 449
 450         /* Keeps information of the UFS device connected to this host */
 451         struct ufs_dev_info dev_info;
 452         bool auto_bkops_enabled;
 453         struct ufs_vreg_info vreg_info;
 454         struct list_head clk_list_head;
 455
 456         bool wlun_dev_clr_ua;
 457
 458         struct ufs_pa_layer_attr pwr_info;
 459         struct ufs_pwr_mode_info max_pwr_info;
 460
 461         struct ufs_clk_gating clk_gating;
 462         /* Control to enable/disable host capabilities */
 463         u32 caps;
 464         /* Allow dynamic clk gating */
 465 #define UFSHCD_CAP_CLK_GATING   (1 << 0)
 466         /* Allow hiberb8 with clk gating */
 467 #define UFSHCD_CAP_HIBERN8_WITH_CLK_GATING (1 << 1)
 468         /* Allow dynamic clk scaling */
 469 #define UFSHCD_CAP_CLK_SCALING  (1 << 2)
 470         /* Allow auto bkops to enabled during runtime suspend */
 471 #define UFSHCD_CAP_AUTO_BKOPS_SUSPEND (1 << 3)
 472
 473         struct devfreq *devfreq;
 474         struct ufs_clk_scaling clk_scaling;
 475         bool is_sys_suspended;
 476 };
 477
 478 /* Returns true if clocks can be gated. Otherwise false */
 479 static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
 480 {
 481         return hba->caps & UFSHCD_CAP_CLK_GATING;
 482 }
 483 static inline bool ufshcd_can_hibern8_during_gating(struct ufs_hba *hba)
 484 {
 485         return hba->caps & UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
 486 }
 487 static inline int ufshcd_is_clkscaling_enabled(struct ufs_hba *hba)
 488 {
 489         return hba->caps & UFSHCD_CAP_CLK_SCALING;
 490 }
 491 static inline bool ufshcd_can_autobkops_during_suspend(struct ufs_hba *hba)
 492 {
 493         return hba->caps & UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
 494 }
 495
 496 #define ufshcd_writel(hba, val, reg)    \
 497         writel((val), (hba)->mmio_base + (reg))
 498 #define ufshcd_readl(hba, reg)  \
 499         readl((hba)->mmio_base + (reg))
 500
 501 /**
 502  * ufshcd_rmwl - read modify write into a register
 503  * @hba - per adapter instance
 504  * @mask - mask to apply on read value
 505  * @val - actual value to write
 506  * @reg - register address
 507  */
 508 static inline void ufshcd_rmwl(struct ufs_hba *hba, u32 mask, u32 val, u32 reg)
 509 {
 510         u32 tmp;
 511
 512         tmp = ufshcd_readl(hba, reg);
 513         tmp &= ~mask;
 514         tmp |= (val & mask);
 515         ufshcd_writel(hba, tmp, reg);
 516 }
 517
 518 int ufshcd_alloc_host(struct device *, struct ufs_hba **);
 519 int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
 520 void ufshcd_remove(struct ufs_hba *);
 521
 522 /**
 523  * ufshcd_hba_stop - Send controller to reset state
 524  * @hba: per adapter instance
 525  */
 526 static inline void ufshcd_hba_stop(struct ufs_hba *hba)
 527 {
 528         ufshcd_writel(hba, CONTROLLER_DISABLE,  REG_CONTROLLER_ENABLE);
 529 }
 530
 531 static inline void check_upiu_size(void)
 532 {
 533         BUILD_BUG_ON(ALIGNED_UPIU_SIZE <
 534                 GENERAL_UPIU_REQUEST_SIZE + QUERY_DESC_MAX_SIZE);
 535 }
 536
 537 extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
 538 extern int ufshcd_runtime_resume(struct ufs_hba *hba);
 539 extern int ufshcd_runtime_idle(struct ufs_hba *hba);
 540 extern int ufshcd_system_suspend(struct ufs_hba *hba);
 541 extern int ufshcd_system_resume(struct ufs_hba *hba);
 542 extern int ufshcd_shutdown(struct ufs_hba *hba);
 543 extern int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
 544                                u8 attr_set, u32 mib_val, u8 peer);
 545 extern int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
 546                                u32 *mib_val, u8 peer);
 547
 548 /* UIC command interfaces for DME primitives */
 549 #define DME_LOCAL       0
 550 #define DME_PEER        1
 551 #define ATTR_SET_NOR    0       /* NORMAL */
 552 #define ATTR_SET_ST     1       /* STATIC */
 553
 554 static inline int ufshcd_dme_set(struct ufs_hba *hba, u32 attr_sel,
 555                                  u32 mib_val)
 556 {
 557         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
 558                                    mib_val, DME_LOCAL);
 559 }
 560
 561 static inline int ufshcd_dme_st_set(struct ufs_hba *hba, u32 attr_sel,
 562                                     u32 mib_val)
 563 {
 564         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
 565                                    mib_val, DME_LOCAL);
 566 }
 567
 568 static inline int ufshcd_dme_peer_set(struct ufs_hba *hba, u32 attr_sel,
 569                                       u32 mib_val)
 570 {
 571         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
 572                                    mib_val, DME_PEER);
 573 }
 574
 575 static inline int ufshcd_dme_peer_st_set(struct ufs_hba *hba, u32 attr_sel,
 576                                          u32 mib_val)
 577 {
 578         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
 579                                    mib_val, DME_PEER);
 580 }
 581
 582 static inline int ufshcd_dme_get(struct ufs_hba *hba,
 583                                  u32 attr_sel, u32 *mib_val)
 584 {
 585         return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_LOCAL);
 586 }
 587
 588 static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
 589                                       u32 attr_sel, u32 *mib_val)
 590 {
 591         return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
 592 }
 593
 594 int ufshcd_hold(struct ufs_hba *hba, bool async);
 595 void ufshcd_release(struct ufs_hba *hba);
 596 #endif /* End of Header */