linux/drivers/scsi/ufs/ufs.h
Subhash Jadavani 57d104c153 ufs: add UFS power management support
This patch adds support for UFS device and UniPro link power management
during runtime/system PM.

Main idea is to define multiple UFS low power levels based on UFS device
and UFS link power states. This would allow any specific platform or pci
driver to choose the best suited low power level during runtime and
system suspend based on their power goals.

bkops handlig:
To put the UFS device in sleep state when bkops is disabled, first query
the bkops status from the device and enable bkops on device only if
device needs time to perform the bkops.

START_STOP handling:
Before sending START_STOP_UNIT to the device well-known logical unit
(w-lun) to make sure that the device w-lun unit attention condition is
cleared.

Write protection:
UFS device specification allows LUs to be write protected, either
permanently or power on write protected. If any LU is power on write
protected and if the card is power cycled (by powering off VCCQ and/or
VCC rails), LU's write protect status would be lost. So this means those
LUs can be written now. To ensures that UFS device is power cycled only
if the power on protect is not set for any of the LUs, check if power on
write protect is set and if device is in sleep/power-off state & link in
inactive state (Hibern8 or OFF state).
If none of the Logical Units on UFS device is power on write protected
then all UFS device power rails (VCC, VCCQ & VCCQ2) can be turned off if
UFS device is in power-off state and UFS link is in OFF state. But current
implementation would disable all device power rails even if UFS link is
not in OFF state.

Low power mode:
If UFS link is in OFF state then UFS host controller can be power collapsed
to avoid leakage current from it. Note that if UFS host controller is power
collapsed, full UFS reinitialization will be required on resume to
re-establish the link between host and device.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2014-10-01 13:11:23 +02:00

492 lines
13 KiB
C

/*
* Universal Flash Storage Host controller driver
*
* This code is based on drivers/scsi/ufs/ufs.h
* Copyright (C) 2011-2013 Samsung India Software Operations
*
* 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 _UFS_H
#define _UFS_H
#include <linux/mutex.h>
#include <linux/types.h>
#define MAX_CDB_SIZE 16
#define GENERAL_UPIU_REQUEST_SIZE 32
#define QUERY_DESC_MAX_SIZE 255
#define QUERY_DESC_MIN_SIZE 2
#define QUERY_OSF_SIZE (GENERAL_UPIU_REQUEST_SIZE - \
(sizeof(struct utp_upiu_header)))
#define UPIU_HEADER_DWORD(byte3, byte2, byte1, byte0)\
cpu_to_be32((byte3 << 24) | (byte2 << 16) |\
(byte1 << 8) | (byte0))
/*
* UFS device may have standard LUs and LUN id could be from 0x00 to
* 0x7F. Standard LUs use "Peripheral Device Addressing Format".
* UFS device may also have the Well Known LUs (also referred as W-LU)
* which again could be from 0x00 to 0x7F. For W-LUs, device only use
* the "Extended Addressing Format" which means the W-LUNs would be
* from 0xc100 (SCSI_W_LUN_BASE) onwards.
* This means max. LUN number reported from UFS device could be 0xC17F.
*/
#define UFS_UPIU_MAX_UNIT_NUM_ID 0x7F
#define UFS_MAX_LUNS (SCSI_W_LUN_BASE + UFS_UPIU_MAX_UNIT_NUM_ID)
#define UFS_UPIU_WLUN_ID (1 << 7)
#define UFS_UPIU_MAX_GENERAL_LUN 8
/* Well known logical unit id in LUN field of UPIU */
enum {
UFS_UPIU_REPORT_LUNS_WLUN = 0x81,
UFS_UPIU_UFS_DEVICE_WLUN = 0xD0,
UFS_UPIU_BOOT_WLUN = 0xB0,
UFS_UPIU_RPMB_WLUN = 0xC4,
};
/*
* UFS Protocol Information Unit related definitions
*/
/* Task management functions */
enum {
UFS_ABORT_TASK = 0x01,
UFS_ABORT_TASK_SET = 0x02,
UFS_CLEAR_TASK_SET = 0x04,
UFS_LOGICAL_RESET = 0x08,
UFS_QUERY_TASK = 0x80,
UFS_QUERY_TASK_SET = 0x81,
};
/* UTP UPIU Transaction Codes Initiator to Target */
enum {
UPIU_TRANSACTION_NOP_OUT = 0x00,
UPIU_TRANSACTION_COMMAND = 0x01,
UPIU_TRANSACTION_DATA_OUT = 0x02,
UPIU_TRANSACTION_TASK_REQ = 0x04,
UPIU_TRANSACTION_QUERY_REQ = 0x16,
};
/* UTP UPIU Transaction Codes Target to Initiator */
enum {
UPIU_TRANSACTION_NOP_IN = 0x20,
UPIU_TRANSACTION_RESPONSE = 0x21,
UPIU_TRANSACTION_DATA_IN = 0x22,
UPIU_TRANSACTION_TASK_RSP = 0x24,
UPIU_TRANSACTION_READY_XFER = 0x31,
UPIU_TRANSACTION_QUERY_RSP = 0x36,
UPIU_TRANSACTION_REJECT_UPIU = 0x3F,
};
/* UPIU Read/Write flags */
enum {
UPIU_CMD_FLAGS_NONE = 0x00,
UPIU_CMD_FLAGS_WRITE = 0x20,
UPIU_CMD_FLAGS_READ = 0x40,
};
/* UPIU Task Attributes */
enum {
UPIU_TASK_ATTR_SIMPLE = 0x00,
UPIU_TASK_ATTR_ORDERED = 0x01,
UPIU_TASK_ATTR_HEADQ = 0x02,
UPIU_TASK_ATTR_ACA = 0x03,
};
/* UPIU Query request function */
enum {
UPIU_QUERY_FUNC_STANDARD_READ_REQUEST = 0x01,
UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST = 0x81,
};
/* Flag idn for Query Requests*/
enum flag_idn {
QUERY_FLAG_IDN_FDEVICEINIT = 0x01,
QUERY_FLAG_IDN_PWR_ON_WPE = 0x03,
QUERY_FLAG_IDN_BKOPS_EN = 0x04,
};
/* Attribute idn for Query requests */
enum attr_idn {
QUERY_ATTR_IDN_ACTIVE_ICC_LVL = 0x03,
QUERY_ATTR_IDN_BKOPS_STATUS = 0x05,
QUERY_ATTR_IDN_EE_CONTROL = 0x0D,
QUERY_ATTR_IDN_EE_STATUS = 0x0E,
};
/* Descriptor idn for Query requests */
enum desc_idn {
QUERY_DESC_IDN_DEVICE = 0x0,
QUERY_DESC_IDN_CONFIGURAION = 0x1,
QUERY_DESC_IDN_UNIT = 0x2,
QUERY_DESC_IDN_RFU_0 = 0x3,
QUERY_DESC_IDN_INTERCONNECT = 0x4,
QUERY_DESC_IDN_STRING = 0x5,
QUERY_DESC_IDN_RFU_1 = 0x6,
QUERY_DESC_IDN_GEOMETRY = 0x7,
QUERY_DESC_IDN_POWER = 0x8,
QUERY_DESC_IDN_MAX,
};
enum desc_header_offset {
QUERY_DESC_LENGTH_OFFSET = 0x00,
QUERY_DESC_DESC_TYPE_OFFSET = 0x01,
};
enum ufs_desc_max_size {
QUERY_DESC_DEVICE_MAX_SIZE = 0x1F,
QUERY_DESC_CONFIGURAION_MAX_SIZE = 0x90,
QUERY_DESC_UNIT_MAX_SIZE = 0x23,
QUERY_DESC_INTERCONNECT_MAX_SIZE = 0x06,
/*
* Max. 126 UNICODE characters (2 bytes per character) plus 2 bytes
* of descriptor header.
*/
QUERY_DESC_STRING_MAX_SIZE = 0xFE,
QUERY_DESC_GEOMETRY_MAZ_SIZE = 0x44,
QUERY_DESC_POWER_MAX_SIZE = 0x62,
QUERY_DESC_RFU_MAX_SIZE = 0x00,
};
/* Unit descriptor parameters offsets in bytes*/
enum unit_desc_param {
UNIT_DESC_PARAM_LEN = 0x0,
UNIT_DESC_PARAM_TYPE = 0x1,
UNIT_DESC_PARAM_UNIT_INDEX = 0x2,
UNIT_DESC_PARAM_LU_ENABLE = 0x3,
UNIT_DESC_PARAM_BOOT_LUN_ID = 0x4,
UNIT_DESC_PARAM_LU_WR_PROTECT = 0x5,
UNIT_DESC_PARAM_LU_Q_DEPTH = 0x6,
UNIT_DESC_PARAM_MEM_TYPE = 0x8,
UNIT_DESC_PARAM_DATA_RELIABILITY = 0x9,
UNIT_DESC_PARAM_LOGICAL_BLK_SIZE = 0xA,
UNIT_DESC_PARAM_LOGICAL_BLK_COUNT = 0xB,
UNIT_DESC_PARAM_ERASE_BLK_SIZE = 0x13,
UNIT_DESC_PARAM_PROVISIONING_TYPE = 0x17,
UNIT_DESC_PARAM_PHY_MEM_RSRC_CNT = 0x18,
UNIT_DESC_PARAM_CTX_CAPABILITIES = 0x20,
UNIT_DESC_PARAM_LARGE_UNIT_SIZE_M1 = 0x22,
};
/*
* Logical Unit Write Protect
* 00h: LU not write protected
* 01h: LU write protected when fPowerOnWPEn =1
* 02h: LU permanently write protected when fPermanentWPEn =1
*/
enum ufs_lu_wp_type {
UFS_LU_NO_WP = 0x00,
UFS_LU_POWER_ON_WP = 0x01,
UFS_LU_PERM_WP = 0x02,
};
/* bActiveICCLevel parameter current units */
enum {
UFSHCD_NANO_AMP = 0,
UFSHCD_MICRO_AMP = 1,
UFSHCD_MILI_AMP = 2,
UFSHCD_AMP = 3,
};
#define POWER_DESC_MAX_SIZE 0x62
#define POWER_DESC_MAX_ACTV_ICC_LVLS 16
/* Attribute bActiveICCLevel parameter bit masks definitions */
#define ATTR_ICC_LVL_UNIT_OFFSET 14
#define ATTR_ICC_LVL_UNIT_MASK (0x3 << ATTR_ICC_LVL_UNIT_OFFSET)
#define ATTR_ICC_LVL_VALUE_MASK 0x3FF
/* Power descriptor parameters offsets in bytes */
enum power_desc_param_offset {
PWR_DESC_LEN = 0x0,
PWR_DESC_TYPE = 0x1,
PWR_DESC_ACTIVE_LVLS_VCC_0 = 0x2,
PWR_DESC_ACTIVE_LVLS_VCCQ_0 = 0x22,
PWR_DESC_ACTIVE_LVLS_VCCQ2_0 = 0x42,
};
/* Exception event mask values */
enum {
MASK_EE_STATUS = 0xFFFF,
MASK_EE_URGENT_BKOPS = (1 << 2),
};
/* Background operation status */
enum bkops_status {
BKOPS_STATUS_NO_OP = 0x0,
BKOPS_STATUS_NON_CRITICAL = 0x1,
BKOPS_STATUS_PERF_IMPACT = 0x2,
BKOPS_STATUS_CRITICAL = 0x3,
BKOPS_STATUS_MAX = BKOPS_STATUS_CRITICAL,
};
/* UTP QUERY Transaction Specific Fields OpCode */
enum query_opcode {
UPIU_QUERY_OPCODE_NOP = 0x0,
UPIU_QUERY_OPCODE_READ_DESC = 0x1,
UPIU_QUERY_OPCODE_WRITE_DESC = 0x2,
UPIU_QUERY_OPCODE_READ_ATTR = 0x3,
UPIU_QUERY_OPCODE_WRITE_ATTR = 0x4,
UPIU_QUERY_OPCODE_READ_FLAG = 0x5,
UPIU_QUERY_OPCODE_SET_FLAG = 0x6,
UPIU_QUERY_OPCODE_CLEAR_FLAG = 0x7,
UPIU_QUERY_OPCODE_TOGGLE_FLAG = 0x8,
};
/* Query response result code */
enum {
QUERY_RESULT_SUCCESS = 0x00,
QUERY_RESULT_NOT_READABLE = 0xF6,
QUERY_RESULT_NOT_WRITEABLE = 0xF7,
QUERY_RESULT_ALREADY_WRITTEN = 0xF8,
QUERY_RESULT_INVALID_LENGTH = 0xF9,
QUERY_RESULT_INVALID_VALUE = 0xFA,
QUERY_RESULT_INVALID_SELECTOR = 0xFB,
QUERY_RESULT_INVALID_INDEX = 0xFC,
QUERY_RESULT_INVALID_IDN = 0xFD,
QUERY_RESULT_INVALID_OPCODE = 0xFE,
QUERY_RESULT_GENERAL_FAILURE = 0xFF,
};
/* UTP Transfer Request Command Type (CT) */
enum {
UPIU_COMMAND_SET_TYPE_SCSI = 0x0,
UPIU_COMMAND_SET_TYPE_UFS = 0x1,
UPIU_COMMAND_SET_TYPE_QUERY = 0x2,
};
/* UTP Transfer Request Command Offset */
#define UPIU_COMMAND_TYPE_OFFSET 28
/* Offset of the response code in the UPIU header */
#define UPIU_RSP_CODE_OFFSET 8
enum {
MASK_SCSI_STATUS = 0xFF,
MASK_TASK_RESPONSE = 0xFF00,
MASK_RSP_UPIU_RESULT = 0xFFFF,
MASK_QUERY_DATA_SEG_LEN = 0xFFFF,
MASK_RSP_UPIU_DATA_SEG_LEN = 0xFFFF,
MASK_RSP_EXCEPTION_EVENT = 0x10000,
};
/* Task management service response */
enum {
UPIU_TASK_MANAGEMENT_FUNC_COMPL = 0x00,
UPIU_TASK_MANAGEMENT_FUNC_NOT_SUPPORTED = 0x04,
UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED = 0x08,
UPIU_TASK_MANAGEMENT_FUNC_FAILED = 0x05,
UPIU_INCORRECT_LOGICAL_UNIT_NO = 0x09,
};
/* UFS device power modes */
enum ufs_dev_pwr_mode {
UFS_ACTIVE_PWR_MODE = 1,
UFS_SLEEP_PWR_MODE = 2,
UFS_POWERDOWN_PWR_MODE = 3,
};
/**
* struct utp_upiu_header - UPIU header structure
* @dword_0: UPIU header DW-0
* @dword_1: UPIU header DW-1
* @dword_2: UPIU header DW-2
*/
struct utp_upiu_header {
__be32 dword_0;
__be32 dword_1;
__be32 dword_2;
};
/**
* struct utp_upiu_cmd - Command UPIU structure
* @data_transfer_len: Data Transfer Length DW-3
* @cdb: Command Descriptor Block CDB DW-4 to DW-7
*/
struct utp_upiu_cmd {
__be32 exp_data_transfer_len;
u8 cdb[MAX_CDB_SIZE];
};
/**
* struct utp_upiu_query - upiu request buffer structure for
* query request.
* @opcode: command to perform B-0
* @idn: a value that indicates the particular type of data B-1
* @index: Index to further identify data B-2
* @selector: Index to further identify data B-3
* @reserved_osf: spec reserved field B-4,5
* @length: number of descriptor bytes to read/write B-6,7
* @value: Attribute value to be written DW-5
* @reserved: spec reserved DW-6,7
*/
struct utp_upiu_query {
u8 opcode;
u8 idn;
u8 index;
u8 selector;
__be16 reserved_osf;
__be16 length;
__be32 value;
__be32 reserved[2];
};
/**
* struct utp_upiu_req - general upiu request structure
* @header:UPIU header structure DW-0 to DW-2
* @sc: fields structure for scsi command DW-3 to DW-7
* @qr: fields structure for query request DW-3 to DW-7
*/
struct utp_upiu_req {
struct utp_upiu_header header;
union {
struct utp_upiu_cmd sc;
struct utp_upiu_query qr;
};
};
/**
* struct utp_cmd_rsp - Response UPIU structure
* @residual_transfer_count: Residual transfer count DW-3
* @reserved: Reserved double words DW-4 to DW-7
* @sense_data_len: Sense data length DW-8 U16
* @sense_data: Sense data field DW-8 to DW-12
*/
struct utp_cmd_rsp {
__be32 residual_transfer_count;
__be32 reserved[4];
__be16 sense_data_len;
u8 sense_data[18];
};
/**
* struct utp_upiu_rsp - general upiu response structure
* @header: UPIU header structure DW-0 to DW-2
* @sr: fields structure for scsi command DW-3 to DW-12
* @qr: fields structure for query request DW-3 to DW-7
*/
struct utp_upiu_rsp {
struct utp_upiu_header header;
union {
struct utp_cmd_rsp sr;
struct utp_upiu_query qr;
};
};
/**
* struct utp_upiu_task_req - Task request UPIU structure
* @header - UPIU header structure DW0 to DW-2
* @input_param1: Input parameter 1 DW-3
* @input_param2: Input parameter 2 DW-4
* @input_param3: Input parameter 3 DW-5
* @reserved: Reserved double words DW-6 to DW-7
*/
struct utp_upiu_task_req {
struct utp_upiu_header header;
__be32 input_param1;
__be32 input_param2;
__be32 input_param3;
__be32 reserved[2];
};
/**
* struct utp_upiu_task_rsp - Task Management Response UPIU structure
* @header: UPIU header structure DW0-DW-2
* @output_param1: Ouput parameter 1 DW3
* @output_param2: Output parameter 2 DW4
* @reserved: Reserved double words DW-5 to DW-7
*/
struct utp_upiu_task_rsp {
struct utp_upiu_header header;
__be32 output_param1;
__be32 output_param2;
__be32 reserved[3];
};
/**
* struct ufs_query_req - parameters for building a query request
* @query_func: UPIU header query function
* @upiu_req: the query request data
*/
struct ufs_query_req {
u8 query_func;
struct utp_upiu_query upiu_req;
};
/**
* struct ufs_query_resp - UPIU QUERY
* @response: device response code
* @upiu_res: query response data
*/
struct ufs_query_res {
u8 response;
struct utp_upiu_query upiu_res;
};
#define UFS_VREG_VCC_MIN_UV 2700000 /* uV */
#define UFS_VREG_VCC_MAX_UV 3600000 /* uV */
#define UFS_VREG_VCC_1P8_MIN_UV 1700000 /* uV */
#define UFS_VREG_VCC_1P8_MAX_UV 1950000 /* uV */
#define UFS_VREG_VCCQ_MIN_UV 1100000 /* uV */
#define UFS_VREG_VCCQ_MAX_UV 1300000 /* uV */
#define UFS_VREG_VCCQ2_MIN_UV 1650000 /* uV */
#define UFS_VREG_VCCQ2_MAX_UV 1950000 /* uV */
/*
* VCCQ & VCCQ2 current requirement when UFS device is in sleep state
* and link is in Hibern8 state.
*/
#define UFS_VREG_LPM_LOAD_UA 1000 /* uA */
struct ufs_vreg {
struct regulator *reg;
const char *name;
bool enabled;
int min_uV;
int max_uV;
int min_uA;
int max_uA;
};
struct ufs_vreg_info {
struct ufs_vreg *vcc;
struct ufs_vreg *vccq;
struct ufs_vreg *vccq2;
struct ufs_vreg *vdd_hba;
};
struct ufs_dev_info {
bool f_power_on_wp_en;
/* Keeps information if any of the LU is power on write protected */
bool is_lu_power_on_wp;
};
#endif /* End of Header */