include/linux/scsi/ufs/ufshcd.h

/*
 * Universal Flash Storage Host controller driver
 *
 * This code is based on drivers/scsi/ufs/ufshcd.h
 * Copyright (C) 2011-2013 Samsung India Software Operations
 * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
 *
 * Authors:
 *	Santosh Yaraganavi <santosh.sy@samsung.com>
 *	Vinayak Holikatti <h.vinayak@samsung.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * See the COPYING file in the top-level directory or visit
 * <http://www.gnu.org/licenses/gpl-2.0.html>
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * This program is provided "AS IS" and "WITH ALL FAULTS" and
 * without warranty of any kind. You are solely responsible for
 * determining the appropriateness of using and distributing
 * the program and assume all risks associated with your exercise
 * of rights with respect to the program, including but not limited
 * to infringement of third party rights, the risks and costs of
 * program errors, damage to or loss of data, programs or equipment,
 * and unavailability or interruption of operations. Under no
 * circumstances will the contributor of this Program be liable for
 * any damages of any kind arising from your use or distribution of
 * this program.
 */

#ifndef _UFSHCD_H
#define _UFSHCD_H

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/bitops.h>
#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_qos.h>
#include <linux/scsi/ufs/unipro.h>

#include <asm/irq.h>
#include <asm/byteorder.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_eh.h>

#include <linux/fault-inject.h>
#include "ufs.h"

#define UFSHCD "ufshcd"
#define UFSHCD_DRIVER_VERSION "0.2"

struct ufs_hba;

enum dev_cmd_type {
	DEV_CMD_TYPE_NOP		= 0x0,
	DEV_CMD_TYPE_QUERY		= 0x1,
};

/**
 * struct uic_command - UIC command structure
 * @command: UIC command
 * @argument1: UIC command argument 1
 * @argument2: UIC command argument 2
 * @argument3: UIC command argument 3
 * @cmd_active: Indicate if UIC command is outstanding
 * @result: UIC command result
 * @done: UIC command completion
 */
struct uic_command {
	u32 command;
	u32 argument1;
	u32 argument2;
	u32 argument3;
	int cmd_active;
	int result;
	struct completion done;
};

/* Used to differentiate the power management options */
enum ufs_pm_op {
	UFS_RUNTIME_PM,
	UFS_SYSTEM_PM,
	UFS_SHUTDOWN_PM,
};

#define ufshcd_is_runtime_pm(op) ((op) == UFS_RUNTIME_PM)
#define ufshcd_is_system_pm(op) ((op) == UFS_SYSTEM_PM)
#define ufshcd_is_shutdown_pm(op) ((op) == UFS_SHUTDOWN_PM)

/* Host <-> Device UniPro Link state */
enum uic_link_state {
	UIC_LINK_OFF_STATE	= 0, /* Link powered down or disabled */
	UIC_LINK_ACTIVE_STATE	= 1, /* Link is in Fast/Slow/Sleep state */
	UIC_LINK_HIBERN8_STATE	= 2, /* Link is in Hibernate state */
};

#define ufshcd_is_link_off(hba) ((hba)->uic_link_state == UIC_LINK_OFF_STATE)
#define ufshcd_is_link_active(hba) ((hba)->uic_link_state == \
				    UIC_LINK_ACTIVE_STATE)
#define ufshcd_is_link_hibern8(hba) ((hba)->uic_link_state == \
				    UIC_LINK_HIBERN8_STATE)
#define ufshcd_set_link_off(hba) ((hba)->uic_link_state = UIC_LINK_OFF_STATE)
#define ufshcd_set_link_active(hba) ((hba)->uic_link_state = \
				    UIC_LINK_ACTIVE_STATE)
#define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \
				    UIC_LINK_HIBERN8_STATE)

enum {
	/* errors which require the host controller reset for recovery */
	UFS_ERR_HIBERN8_EXIT,
	UFS_ERR_VOPS_SUSPEND,
	UFS_ERR_EH,
	UFS_ERR_CLEAR_PEND_XFER_TM,
	UFS_ERR_INT_FATAL_ERRORS,
	UFS_ERR_INT_UIC_ERROR,

	/* other errors */
	UFS_ERR_HIBERN8_ENTER,
	UFS_ERR_RESUME,
	UFS_ERR_SUSPEND,
	UFS_ERR_LINKSTARTUP,
	UFS_ERR_POWER_MODE_CHANGE,
	UFS_ERR_TASK_ABORT,
	UFS_ERR_MAX,
};

/*
 * UFS Power management levels.
 * Each level is in increasing order of power savings.
 */
enum ufs_pm_level {
	UFS_PM_LVL_0, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE */
	UFS_PM_LVL_1, /* UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE */
	UFS_PM_LVL_2, /* UFS_SLEEP_PWR_MODE, UIC_LINK_ACTIVE_STATE */
	UFS_PM_LVL_3, /* UFS_SLEEP_PWR_MODE, UIC_LINK_HIBERN8_STATE */
	UFS_PM_LVL_4, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_HIBERN8_STATE */
	UFS_PM_LVL_5, /* UFS_POWERDOWN_PWR_MODE, UIC_LINK_OFF_STATE */
	UFS_PM_LVL_MAX
};

struct ufs_pm_lvl_states {
	enum ufs_dev_pwr_mode dev_state;
	enum uic_link_state link_state;
};

/**
 * struct ufshcd_lrb - local reference block
 * @utr_descriptor_ptr: UTRD address of the command
 * @ucd_req_ptr: UCD address of the command
 * @ucd_rsp_ptr: Response UPIU address for this command
 * @ucd_prdt_ptr: PRDT address of the command
 * @utrd_dma_addr: UTRD dma address for debug
 * @ucd_prdt_dma_addr: PRDT dma address for debug
 * @ucd_rsp_dma_addr: UPIU response dma address for debug
 * @ucd_req_dma_addr: UPIU request dma address for debug
 * @cmd: pointer to SCSI command
 * @sense_buffer: pointer to sense buffer address of the SCSI command
 * @sense_bufflen: Length of the sense buffer
 * @scsi_status: SCSI status of the command
 * @command_type: SCSI, UFS, Query.
 * @task_tag: Task tag of the command
 * @lun: LUN of the command
 * @intr_cmd: Interrupt command (doesn't participate in interrupt aggregation)
 * @issue_time_stamp: time stamp for debug purposes
 * @complete_time_stamp: time stamp for statistics
 * @req_abort_skip: skip request abort task flag
 */
struct ufshcd_lrb {
	struct utp_transfer_req_desc *utr_descriptor_ptr;
	struct utp_upiu_req *ucd_req_ptr;
	struct utp_upiu_rsp *ucd_rsp_ptr;
	struct ufshcd_sg_entry *ucd_prdt_ptr;

	dma_addr_t utrd_dma_addr;
	dma_addr_t ucd_req_dma_addr;
	dma_addr_t ucd_rsp_dma_addr;
	dma_addr_t ucd_prdt_dma_addr;

	struct scsi_cmnd *cmd;
	u8 *sense_buffer;
	unsigned int sense_bufflen;
	int scsi_status;

	int command_type;
	int task_tag;
	u8 lun; /* UPIU LUN id field is only 8-bit wide */
	bool intr_cmd;
	ktime_t issue_time_stamp;
	ktime_t complete_time_stamp;

	bool req_abort_skip;
};

/**
 * struct ufs_query - holds relevent data structures for query request
 * @request: request upiu and function
 * @descriptor: buffer for sending/receiving descriptor
 * @response: response upiu and response
 */
struct ufs_query {
	struct ufs_query_req request;
	u8 *descriptor;
	struct ufs_query_res response;
};

/**
 * struct ufs_dev_cmd - all assosiated fields with device management commands
 * @type: device management command type - Query, NOP OUT
 * @lock: lock to allow one command at a time
 * @complete: internal commands completion
 * @tag_wq: wait queue until free command slot is available
 */
struct ufs_dev_cmd {
	enum dev_cmd_type type;
	struct mutex lock;
	struct completion *complete;
	wait_queue_head_t tag_wq;
	struct ufs_query query;
};

#define UIC_ERR_REG_HIST_LENGTH 8
/**
 * struct ufs_uic_err_reg_hist - keeps history of uic errors
 * @pos: index to indicate cyclic buffer position
 * @reg: cyclic buffer for registers value
 * @tstamp: cyclic buffer for time stamp
 */
struct ufs_uic_err_reg_hist {
	int pos;
	u32 reg[UIC_ERR_REG_HIST_LENGTH];
	ktime_t tstamp[UIC_ERR_REG_HIST_LENGTH];
};

#ifdef CONFIG_DEBUG_FS
struct debugfs_files {
	struct dentry *debugfs_root;
	struct dentry *tag_stats;
	struct dentry *err_stats;
	struct dentry *show_hba;
	struct dentry *host_regs;
	struct dentry *dump_dev_desc;
	struct dentry *power_mode;
	struct dentry *dme_local_read;
	struct dentry *dme_peer_read;
	struct dentry *dbg_print_en;
	struct dentry *req_stats;
	u32 dme_local_attr_id;
	u32 dme_peer_attr_id;
#ifdef CONFIG_UFS_FAULT_INJECTION
	struct fault_attr fail_attr;
#endif
};

/* tag stats statistics types */
enum ts_types {
	TS_NOT_SUPPORTED	= -1,
	TS_TAG			= 0,
	TS_READ			= 1,
	TS_WRITE		= 2,
	TS_URGENT_READ		= 3,
	TS_URGENT_WRITE		= 4,
	TS_FLUSH		= 5,
	TS_NUM_STATS		= 6,
};

/**
 * struct ufshcd_req_stat - statistics for request handling times (in usec)
 * @min: shortest time measured
 * @max: longest time measured
 * @sum: sum of all the handling times measured (used for average calculation)
 * @count: number of measurements taken
 */
struct ufshcd_req_stat {
	u64 min;
	u64 max;
	u64 sum;
	u64 count;
};
#endif

/**
 * struct ufs_stats - keeps usage/err statistics
 * @enabled: enable tag stats for debugfs
 * @tag_stats: pointer to tag statistic counters
 * @q_depth: current amount of busy slots
 * @err_stats: counters to keep track of various errors
 * @req_stat: request handling time statistics per request type
 * @hibern8_exit_cnt: Counter to keep track of number of exits,
 *		reset this after link-startup.
 * @last_hibern8_exit_tstamp: Set time after the hibern8 exit.
 *		Clear after the first successful command completion.
 * @pa_err: tracks pa-uic errors
 * @dl_err: tracks dl-uic errors
 * @nl_err: tracks nl-uic errors
 * @tl_err: tracks tl-uic errors
 * @dme_err: tracks dme errors
 */
struct ufs_stats {
#ifdef CONFIG_DEBUG_FS
	bool enabled;
	u64 **tag_stats;
	int q_depth;
	int err_stats[UFS_ERR_MAX];
	struct ufshcd_req_stat req_stats[TS_NUM_STATS];
#endif
	u32 hibern8_exit_cnt;
	ktime_t last_hibern8_exit_tstamp;
	struct ufs_uic_err_reg_hist pa_err;
	struct ufs_uic_err_reg_hist dl_err;
	struct ufs_uic_err_reg_hist nl_err;
	struct ufs_uic_err_reg_hist tl_err;
	struct ufs_uic_err_reg_hist dme_err;
};

/**
 * struct ufs_clk_info - UFS clock related info
 * @list: list headed by hba->clk_list_head
 * @clk: clock node
 * @name: clock name
 * @max_freq: maximum frequency supported by the clock
 * @min_freq: min frequency that can be used for clock scaling
 * @curr_freq: indicates the current frequency that it is set to
 * @enabled: variable to check against multiple enable/disable
 */
struct ufs_clk_info {
	struct list_head list;
	struct clk *clk;
	const char *name;
	u32 max_freq;
	u32 min_freq;
	u32 curr_freq;
	bool enabled;
};

#define PRE_CHANGE      0
#define POST_CHANGE     1

struct ufs_pa_layer_attr {
	u32 gear_rx;
	u32 gear_tx;
	u32 lane_rx;
	u32 lane_tx;
	u32 pwr_rx;
	u32 pwr_tx;
	u32 hs_rate;
};

struct ufs_pwr_mode_info {
	bool is_valid;
	struct ufs_pa_layer_attr info;
};

/**
 * struct ufs_hba_variant_ops - variant specific callbacks
 * @name: variant name
 * @init: called when the driver is initialized
 * @exit: called to cleanup everything done in init
 * @clk_scale_notify: notifies that clks are scaled up/down
 * @setup_clocks: called before touching any of the controller registers
 * @setup_regulators: called before accessing the host controller
 * @hce_enable_notify: called before and after HCE enable bit is set to allow
 *                     variant specific Uni-Pro initialization.
 * @link_startup_notify: called before and after Link startup is carried out
 *                       to allow variant specific Uni-Pro initialization.
 * @pwr_change_notify: called before and after a power mode change
 *			is carried out to allow vendor spesific capabilities
 *			to be set.
 * @suspend: called during host controller PM callback
 * @resume: called during host controller PM callback
 * @update_sec_cfg: called to restore host controller secure configuration
 * @crypto_engine_cfg: configure cryptographic engine according to tag parameter
 * @crypto_engine_eh: cryptographic engine error handling.
 *                Return true is it detects an error, false on
 *                success
 * @crypto_engine_get_err: returns the saved error status of the
 *                         cryptographic engine.If a positive
 *                         value is returned, host controller
 *                         should be reset.
 * @crypto_engine_reset_err: resets the saved error status of
 *                         the cryptographic engine
 * @dbg_register_dump: used to dump controller debug information
 * @add_debugfs: used to add debugfs entries
 * @remove_debugfs: used to remove debugfs entries
 */
struct ufs_hba_variant_ops {
	const char *name;
	int	(*init)(struct ufs_hba *);
	void    (*exit)(struct ufs_hba *);
	void    (*clk_scale_notify)(struct ufs_hba *);
	int     (*setup_clocks)(struct ufs_hba *, bool);
	int     (*setup_regulators)(struct ufs_hba *, bool);
	int     (*hce_enable_notify)(struct ufs_hba *, bool);
	int     (*link_startup_notify)(struct ufs_hba *, bool);
	int	(*pwr_change_notify)(struct ufs_hba *,
					bool, struct ufs_pa_layer_attr *,
					struct ufs_pa_layer_attr *);
	int     (*suspend)(struct ufs_hba *, enum ufs_pm_op);
	int     (*resume)(struct ufs_hba *, enum ufs_pm_op);
	int	(*update_sec_cfg)(struct ufs_hba *hba, bool restore_sec_cfg);
	int	(*crypto_engine_cfg)(struct ufs_hba *, unsigned int);
	int	(*crypto_engine_reset)(struct ufs_hba *);
	int	(*crypto_engine_eh)(struct ufs_hba *);
	int	(*crypto_engine_get_err)(struct ufs_hba *);
	void	(*crypto_engine_reset_err)(struct ufs_hba *);
	void	(*dbg_register_dump)(struct ufs_hba *hba);
#ifdef CONFIG_DEBUG_FS
	void	(*add_debugfs)(struct ufs_hba *hba, struct dentry *root);
	void	(*remove_debugfs)(struct ufs_hba *hba);
#endif
};

/* clock gating state  */
enum clk_gating_state {
	CLKS_OFF,
	CLKS_ON,
	REQ_CLKS_OFF,
	REQ_CLKS_ON,
};

/* UFS Host Controller debug print bitmask */
#define UFSHCD_DBG_PRINT_CLK_FREQ_EN		UFS_BIT(0)
#define UFSHCD_DBG_PRINT_UIC_ERR_HIST_EN	UFS_BIT(1)
#define UFSHCD_DBG_PRINT_HOST_REGS_EN		UFS_BIT(2)
#define UFSHCD_DBG_PRINT_TRS_EN			UFS_BIT(3)
#define UFSHCD_DBG_PRINT_TMRS_EN		UFS_BIT(4)
#define UFSHCD_DBG_PRINT_PWR_EN			UFS_BIT(5)
#define UFSHCD_DBG_PRINT_HOST_STATE_EN		UFS_BIT(6)

#define UFSHCD_DBG_PRINT_ALL						   \
		(UFSHCD_DBG_PRINT_CLK_FREQ_EN		|		   \
		 UFSHCD_DBG_PRINT_UIC_ERR_HIST_EN	|		   \
		 UFSHCD_DBG_PRINT_HOST_REGS_EN | UFSHCD_DBG_PRINT_TRS_EN | \
		 UFSHCD_DBG_PRINT_TMRS_EN | UFSHCD_DBG_PRINT_PWR_EN |	   \
		 UFSHCD_DBG_PRINT_HOST_STATE_EN)

/**
 * struct ufs_clk_gating - UFS clock gating related info
 * @gate_work: worker to turn off clocks after some delay as specified in
 * delay_ms
 * @ungate_work: worker to turn on clocks that will be used in case of
 * interrupt context
 * @state: the current clocks state
 * @delay_ms: gating delay in ms
 * @is_suspended: clk gating is suspended when set to 1 which can be used
 * during suspend/resume
 * @delay_attr: sysfs attribute to control delay_attr
 * @enable_attr: sysfs attribute to enable/disable clock gating
 * @is_enabled: Indicates the current status of clock gating
 * @active_reqs: number of requests that are pending and should be waited for
 * completion before gating clocks.
 */
struct ufs_clk_gating {
	struct delayed_work gate_work;
	struct work_struct ungate_work;
	enum clk_gating_state state;
	unsigned long delay_ms;
	bool is_suspended;
	struct device_attribute delay_attr;
	struct device_attribute enable_attr;
	bool is_enabled;
	int active_reqs;
};

/* Hibern8 state  */
enum ufshcd_hibern8_on_idle_state {
	HIBERN8_ENTERED,
	HIBERN8_EXITED,
	REQ_HIBERN8_ENTER,
	REQ_HIBERN8_EXIT,
};

/**
 * struct ufs_hibern8_on_idle - UFS Hibern8 on idle related data
 * @enter_work: worker to put UFS link in hibern8 after some delay as
 * specified in delay_ms
 * @exit_work: worker to bring UFS link out of hibern8
 * @state: the current hibern8 state
 * @delay_ms: hibern8 enter delay in ms
 * @is_suspended: hibern8 enter is suspended when set to 1 which can be used
 * during suspend/resume
 * @active_reqs: number of requests that are pending and should be waited for
 * completion before scheduling delayed "enter_work".
 * @delay_attr: sysfs attribute to control delay_attr
 * @enable_attr: sysfs attribute to enable/disable hibern8 on idle
 * @is_enabled: Indicates the current status of hibern8
 */
struct ufs_hibern8_on_idle {
	struct delayed_work enter_work;
	struct work_struct exit_work;
	enum ufshcd_hibern8_on_idle_state state;
	unsigned long delay_ms;
	bool is_suspended;
	int active_reqs;
	struct device_attribute delay_attr;
	struct device_attribute enable_attr;
	bool is_enabled;
};

struct ufs_clk_scaling {
	ktime_t  busy_start_t;
	bool is_busy_started;
	unsigned long  tot_busy_t;
	unsigned long window_start_t;
	struct device_attribute enable_attr;
	bool is_allowed;
};

/**
 * struct ufs_init_prefetch - contains data that is pre-fetched once during
 * initialization
 * @icc_level: icc level which was read during initialization
 */
struct ufs_init_prefetch {
	u32 icc_level;
};

/* PM QoS voting state  */
enum ufshcd_pm_qos_state {
	PM_QOS_UNVOTED,
	PM_QOS_VOTED,
	PM_QOS_REQ_VOTE,
	PM_QOS_REQ_UNVOTE,
};

/* Default latency for PM QOS */
#define UFS_DEFAULT_CPU_DMA_LATENCY_US	200	/* microseconds */

/**
 * struct ufshcd_pm_qos - data related to PM QoS voting logic
 * @vote_work: work object for voting procedure
 * @unvote_work: work object for un-voting procedure
 * @req: request object for PM QoS
 * @cpu_dma_latency_us: requested latency value used for voting in microseconds
 * @state: voting state machine current state
 * @active_reqs: number of active requests requiring PM QoS voting
 * @is_suspended: flag specifying whether voting logic is suspended.
 * When set, voting will not occur for pending requests.
 */
struct ufshcd_pm_qos {
	struct work_struct vote_work;
	struct work_struct unvote_work;
	struct pm_qos_request req;
	u32 cpu_dma_latency_us;
	enum ufshcd_pm_qos_state state;
	int active_reqs;
	bool is_suspended;
};

/**
 * struct ufs_hba - per adapter private structure
 * @mmio_base: UFSHCI base register address
 * @ucdl_base_addr: UFS Command Descriptor base address
 * @utrdl_base_addr: UTP Transfer Request Descriptor base address
 * @utmrdl_base_addr: UTP Task Management Descriptor base address
 * @ucdl_dma_addr: UFS Command Descriptor DMA address
 * @utrdl_dma_addr: UTRDL DMA address
 * @utmrdl_dma_addr: UTMRDL DMA address
 * @host: Scsi_Host instance of the driver
 * @dev: device handle
 * @lrb: local reference block
 * @lrb_in_use: lrb in use
 * @outstanding_tasks: Bits representing outstanding task requests
 * @outstanding_reqs: Bits representing outstanding transfer requests
 * @capabilities: UFS Controller Capabilities
 * @nutrs: Transfer Request Queue depth supported by controller
 * @nutmrs: Task Management Queue depth supported by controller
 * @ufs_version: UFS Version to which controller complies
 * @vops: pointer to variant specific operations
 * @priv: pointer to variant specific private data
 * @irq: Irq number of the controller
 * @active_uic_cmd: handle of active UIC command
 * @uic_cmd_mutex: mutex for uic command
 * @tm_wq: wait queue for task management
 * @tm_tag_wq: wait queue for free task management slots
 * @tm_condition: condition variable for task management
 * @tm_slots_in_use: bit map of task management request slots in use
 * @pwr_done: completion for power mode change
 * @ufshcd_state: UFSHCD states
 * @eh_flags: Error handling flags
 * @intr_mask: Interrupt Mask Bits
 * @ee_ctrl_mask: Exception event control mask
 * @is_powered: flag to check if HBA is powered
 * @is_init_prefetch: flag to check if data was pre-fetched in initialization
 * @init_prefetch_data: data pre-fetched during initialization
 * @eh_work: Worker to handle UFS errors that require s/w attention
 * @eeh_work: Worker to handle exception events
 * @errors: HBA errors
 * @uic_error: UFS interconnect layer error status
 * @saved_err: sticky error mask
 * @saved_uic_err: sticky UIC error mask
 * @dev_cmd: ufs device management command information
 * @last_dme_cmd_tstamp: time stamp of the last completed DME command
 * @auto_bkops_enabled: to track whether bkops is enabled in device
 * @vreg_info: UFS device voltage regulator information
 * @clk_list_head: UFS host controller clocks list node head
 * @pwr_info: holds current power mode
 * @max_pwr_info: keeps the device max valid pwm
 * @hibern8_on_idle: UFS Hibern8 on idle related data
 * @ufs_stats: ufshcd statistics to be used via debugfs
 * @debugfs_files: debugfs files associated with the ufs stats
 * @ufshcd_dbg_print: Bitmask for enabling debug prints
 */
struct ufs_hba {
	void __iomem *mmio_base;

	/* Virtual memory reference */
	struct utp_transfer_cmd_desc *ucdl_base_addr;
	struct utp_transfer_req_desc *utrdl_base_addr;
	struct utp_task_req_desc *utmrdl_base_addr;

	/* DMA memory reference */
	dma_addr_t ucdl_dma_addr;
	dma_addr_t utrdl_dma_addr;
	dma_addr_t utmrdl_dma_addr;

	struct Scsi_Host *host;
	struct device *dev;
	/*
	 * This field is to keep a reference to "scsi_device" corresponding to
	 * "UFS device" W-LU.
	 */
	struct scsi_device *sdev_ufs_device;
	enum ufs_dev_pwr_mode curr_dev_pwr_mode;
	enum uic_link_state uic_link_state;
	/* Desired UFS power management level during runtime PM */
	int rpm_lvl;
	/* Desired UFS power management level during system PM */
	int spm_lvl;
	struct device_attribute rpm_lvl_attr;
	struct device_attribute spm_lvl_attr;
	int pm_op_in_progress;

	struct ufshcd_lrb *lrb;
	unsigned long lrb_in_use;

	unsigned long outstanding_tasks;
	unsigned long outstanding_reqs;

	u32 capabilities;
	int nutrs;
	int nutmrs;
	u32 ufs_version;
	struct ufs_hba_variant_ops *vops;
	void *priv;
	unsigned int irq;
	bool is_irq_enabled;

	/* Interrupt aggregation support is broken */
	#define UFSHCD_QUIRK_BROKEN_INTR_AGGR			UFS_BIT(0)

	/*
	 * delay before each dme command is required as the unipro
	 * layer has shown instabilities
	 */
	#define UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS		UFS_BIT(1)

	/*
	 * If UFS host controller is having issue in processing LCC (Line
	 * Control Command) coming from device then enable this quirk.
	 * When this quirk is enabled, host controller driver should disable
	 * the LCC transmission on UFS device (by clearing TX_LCC_ENABLE
	 * attribute of device to 0).
	 */
	#define UFSHCD_QUIRK_BROKEN_LCC				UFS_BIT(2)

	/*
	 * The attribute PA_RXHSUNTERMCAP specifies whether or not the
	 * inbound Link supports unterminated line in HS mode. Setting this
	 * attribute to 1 fixes moving to HS gear.
	 */
	#define UFSHCD_QUIRK_BROKEN_PA_RXHSUNTERMCAP		UFS_BIT(3)

	/*
	 * This quirk needs to be enabled if the host contoller only allows
	 * accessing the peer dme attributes in AUTO mode (FAST AUTO or
	 * SLOW AUTO).
	 */
	#define UFSHCD_QUIRK_DME_PEER_ACCESS_AUTO_MODE		UFS_BIT(4)

	unsigned int quirks;	/* Deviations from standard UFSHCI spec. */

	/* Device deviations from standard UFS device spec. */
	unsigned int dev_quirks;

	wait_queue_head_t tm_wq;
	wait_queue_head_t tm_tag_wq;
	unsigned long tm_condition;
	unsigned long tm_slots_in_use;

	struct uic_command *active_uic_cmd;
	struct mutex uic_cmd_mutex;
	struct completion *uic_async_done;

	u32 ufshcd_state;
	u32 eh_flags;
	u32 intr_mask;
	u16 ee_ctrl_mask;
	bool is_powered;
	bool is_init_prefetch;
	struct ufs_init_prefetch init_prefetch_data;

	/* Work Queues */
	struct work_struct eh_work;
	struct work_struct eeh_work;

	/* HBA Errors */
	u32 errors;
	u32 uic_error;
	u32 saved_err;
	u32 saved_uic_err;
	bool silence_err_logs;

	/* Device management request data */
	struct ufs_dev_cmd dev_cmd;
	ktime_t last_dme_cmd_tstamp;

	/* Keeps information of the UFS device connected to this host */
	struct ufs_dev_info dev_info;
	bool auto_bkops_enabled;
	struct ufs_vreg_info vreg_info;
	struct list_head clk_list_head;

	struct ufs_pa_layer_attr pwr_info;
	struct ufs_pwr_mode_info max_pwr_info;

	struct ufs_clk_gating clk_gating;
	struct ufs_hibern8_on_idle hibern8_on_idle;

	/* Control to enable/disable host capabilities */
	u32 caps;
	/* Allow dynamic clk gating */
#define UFSHCD_CAP_CLK_GATING	(1 << 0)
	/* Allow hiberb8 with clk gating */
#define UFSHCD_CAP_HIBERN8_WITH_CLK_GATING (1 << 1)
	/* Allow dynamic clk scaling */
#define UFSHCD_CAP_CLK_SCALING	(1 << 2)
	/* Allow auto bkops to enabled during runtime suspend */
#define UFSHCD_CAP_AUTO_BKOPS_SUSPEND (1 << 3)
	/*
	 * This capability allows host controller driver to use the UFS HCI's
	 * interrupt aggregation capability.
	 * CAUTION: Enabling this might reduce overall UFS throughput.
	 */
#define UFSHCD_CAP_INTR_AGGR (1 << 4)
	/* Allow standalone Hibern8 enter on idle */
#define UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE (1 << 5)
	/*
	 * This capability allows the device auto-bkops to be always enabled
	 * except during suspend (both runtime and suspend).
	 * Enabling this capability means that device will always be allowed
	 * to do background operation when it's active but it might degrade
	 * the performance of ongoing read/write operations.
	 */
#define UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND (1 << 6)

	struct devfreq *devfreq;
	struct ufs_clk_scaling clk_scaling;
	struct ufs_stats ufs_stats;
#ifdef CONFIG_DEBUG_FS
	struct debugfs_files debugfs_files;
#endif
	bool is_sys_suspended;
	/*
	 * Set this flag to indicate that UNIT ATTENTION condition should be
	 * explicitly cleared for Device WLUN before issuing commands like
	 * START STOP UNIT.
	 */
	bool wlun_dev_clr_ua;

	/* PM Quality-of-Service (QoS) data */
	struct ufshcd_pm_qos pm_qos;

	/* Number of requests aborts */
	int req_abort_count;

	/* Bitmask for enabling debug prints */
	u32 ufshcd_dbg_print;
};

/* Returns true if clocks can be gated. Otherwise false */
static inline bool ufshcd_is_clkgating_allowed(struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_CLK_GATING;
}
static inline bool ufshcd_can_hibern8_during_gating(struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_HIBERN8_WITH_CLK_GATING;
}
static inline int ufshcd_is_clkscaling_supported(struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_CLK_SCALING;
}
static inline bool ufshcd_can_autobkops_during_suspend(struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_AUTO_BKOPS_SUSPEND;
}
static inline bool ufshcd_is_hibern8_on_idle_allowed(struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE;
}
static inline bool ufshcd_keep_autobkops_enabled_except_suspend(
							struct ufs_hba *hba)
{
	return hba->caps & UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND;
}

#define ufshcd_writel(hba, val, reg)	\
	writel_relaxed((val), (hba)->mmio_base + (reg))
#define ufshcd_readl(hba, reg)	\
	readl_relaxed((hba)->mmio_base + (reg))

/**
 * ufshcd_rmwl - read modify write into a register
 * @hba - per adapter instance
 * @mask - mask to apply on read value
 * @val - actual value to write
 * @reg - register address
 */
static inline void ufshcd_rmwl(struct ufs_hba *hba, u32 mask, u32 val, u32 reg)
{
	u32 tmp;

	tmp = ufshcd_readl(hba, reg);
	tmp &= ~mask;
	tmp |= (val & mask);
	ufshcd_writel(hba, tmp, reg);
}

int ufshcd_alloc_host(struct device *, struct ufs_hba **);
void ufshcd_dealloc_host(struct ufs_hba *);
int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int);
void ufshcd_remove(struct ufs_hba *);
int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask,
				u32 val, unsigned long interval_us,
				unsigned long timeout_ms, bool can_sleep);

extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
extern int ufshcd_runtime_resume(struct ufs_hba *hba);
extern int ufshcd_runtime_idle(struct ufs_hba *hba);
extern int ufshcd_system_suspend(struct ufs_hba *hba);
extern int ufshcd_system_resume(struct ufs_hba *hba);
extern int ufshcd_shutdown(struct ufs_hba *hba);
extern int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
			       u8 attr_set, u32 mib_val, u8 peer);
extern int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
			       u32 *mib_val, u8 peer);

/* UIC command interfaces for DME primitives */
#define DME_LOCAL	0
#define DME_PEER	1
#define ATTR_SET_NOR	0	/* NORMAL */
#define ATTR_SET_ST	1	/* STATIC */

static inline int ufshcd_dme_set(struct ufs_hba *hba, u32 attr_sel,
				 u32 mib_val)
{
	return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
				   mib_val, DME_LOCAL);
}

static inline int ufshcd_dme_st_set(struct ufs_hba *hba, u32 attr_sel,
				    u32 mib_val)
{
	return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
				   mib_val, DME_LOCAL);
}

static inline int ufshcd_dme_peer_set(struct ufs_hba *hba, u32 attr_sel,
				      u32 mib_val)
{
	return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
				   mib_val, DME_PEER);
}

static inline int ufshcd_dme_peer_st_set(struct ufs_hba *hba, u32 attr_sel,
					 u32 mib_val)
{
	return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
				   mib_val, DME_PEER);
}

static inline int ufshcd_dme_get(struct ufs_hba *hba,
				 u32 attr_sel, u32 *mib_val)
{
	return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_LOCAL);
}

static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
				      u32 attr_sel, u32 *mib_val)
{
	return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
}

int ufshcd_read_device_desc(struct ufs_hba *hba, u8 *buf, u32 size);

static inline bool ufshcd_is_hs_mode(struct ufs_pa_layer_attr *pwr_info)
{
	return (pwr_info->pwr_rx == FAST_MODE ||
		pwr_info->pwr_rx == FASTAUTO_MODE) &&
		(pwr_info->pwr_tx == FAST_MODE ||
		pwr_info->pwr_tx == FASTAUTO_MODE);
}

static inline void ufshcd_init_req_stats(struct ufs_hba *hba)
{
	memset(hba->ufs_stats.req_stats, 0, sizeof(hba->ufs_stats.req_stats));
}

#define ASCII_STD true
#define UTF16_STD false
int ufshcd_read_string_desc(struct ufs_hba *hba, int desc_index, u8 *buf,
				u32 size, bool ascii);
/* variant specific ops structures */
#ifdef CONFIG_SCSI_UFS_QCOM
extern const struct ufs_hba_variant_ops ufs_hba_qcom_vops;
#else
static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
	.name = "qcom",
};
#endif

#ifndef CONFIG_SMP
static inline int ufshcd_pm_qos_init(struct ufs_hba *hba)
{
	return 0;
}

static inline int ufshcd_pm_qos_hold(struct ufs_hba *hba, bool async)
{
	return 0;
}

static inline int __ufshcd_pm_qos_hold(struct ufs_hba *hba, bool async)
{
	return 0;
}

static inline int ufshcd_pm_qos_release(struct ufs_hba *hba)
{
	return 0;
}

static inline int __ufshcd_pm_qos_release(struct ufs_hba *hba)
{
	return 0;
}

static inline void ufshcd_pm_qos_remove(struct ufs_hba *hba)
{
}

static inline void ufshcd_parse_pm_qos(struct ufs_hba *hba)
{
}
#endif /* CONFIG_SMP */

/* Expose Query-Request API */
int ufshcd_query_flag(struct ufs_hba *hba, enum query_opcode opcode,
	enum flag_idn idn, bool *flag_res);
int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
	enum attr_idn idn, u8 index, u8 selector, u32 *attr_val);
int ufshcd_query_descriptor(struct ufs_hba *hba, enum query_opcode opcode,
	enum desc_idn idn, u8 index, u8 selector, u8 *desc_buf, int *buf_len);

int ufshcd_hold(struct ufs_hba *hba, bool async);
void ufshcd_release(struct ufs_hba *hba, bool no_sched);
int ufshcd_wait_for_doorbell_clr(struct ufs_hba *hba, u64 wait_timeout_us);
int ufshcd_change_power_mode(struct ufs_hba *hba,
			     struct ufs_pa_layer_attr *pwr_mode);
void ufshcd_abort_outstanding_transfer_requests(struct ufs_hba *hba,
		int result);
#endif /* End of Header */