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
  56 #include <asm/irq.h>
  57 #include <asm/byteorder.h>
  58 #include <scsi/scsi.h>
  59 #include <scsi/scsi_cmnd.h>
  60 #include <scsi/scsi_host.h>
  61 #include <scsi/scsi_tcq.h>
  62 #include <scsi/scsi_dbg.h>
  63 #include <scsi/scsi_eh.h>
  64
  65 #include "ufs.h"
  66 #include "ufshci.h"
  67
  68 #define UFSHCD "ufshcd"
  69 #define UFSHCD_DRIVER_VERSION "0.2"
  70
  71 enum dev_cmd_type {
  72         DEV_CMD_TYPE_NOP                = 0x0,
  73         DEV_CMD_TYPE_QUERY              = 0x1,
  74 };
  75
  76 /**
  77  * struct uic_command - UIC command structure
  78  * @command: UIC command
  79  * @argument1: UIC command argument 1
  80  * @argument2: UIC command argument 2
  81  * @argument3: UIC command argument 3
  82  * @cmd_active: Indicate if UIC command is outstanding
  83  * @result: UIC command result
  84  * @done: UIC command completion
  85  */
  86 struct uic_command {
  87         u32 command;
  88         u32 argument1;
  89         u32 argument2;
  90         u32 argument3;
  91         int cmd_active;
  92         int result;
  93         struct completion done;
  94 };
  95
  96 /**
  97  * struct ufshcd_lrb - local reference block
  98  * @utr_descriptor_ptr: UTRD address of the command
  99  * @ucd_req_ptr: UCD address of the command
 100  * @ucd_rsp_ptr: Response UPIU address for this command
 101  * @ucd_prdt_ptr: PRDT address of the command
 102  * @cmd: pointer to SCSI command
 103  * @sense_buffer: pointer to sense buffer address of the SCSI command
 104  * @sense_bufflen: Length of the sense buffer
 105  * @scsi_status: SCSI status of the command
 106  * @command_type: SCSI, UFS, Query.
 107  * @task_tag: Task tag of the command
 108  * @lun: LUN of the command
 109  * @intr_cmd: Interrupt command (doesn't participate in interrupt aggregation)
 110  */
 111 struct ufshcd_lrb {
 112         struct utp_transfer_req_desc *utr_descriptor_ptr;
 113         struct utp_upiu_req *ucd_req_ptr;
 114         struct utp_upiu_rsp *ucd_rsp_ptr;
 115         struct ufshcd_sg_entry *ucd_prdt_ptr;
 116
 117         struct scsi_cmnd *cmd;
 118         u8 *sense_buffer;
 119         unsigned int sense_bufflen;
 120         int scsi_status;
 121
 122         int command_type;
 123         int task_tag;
 124         unsigned int lun;
 125         bool intr_cmd;
 126 };
 127
 128 /**
 129  * struct ufs_query - holds relevent data structures for query request
 130  * @request: request upiu and function
 131  * @descriptor: buffer for sending/receiving descriptor
 132  * @response: response upiu and response
 133  */
 134 struct ufs_query {
 135         struct ufs_query_req request;
 136         u8 *descriptor;
 137         struct ufs_query_res response;
 138 };
 139
 140 /**
 141  * struct ufs_dev_cmd - all assosiated fields with device management commands
 142  * @type: device management command type - Query, NOP OUT
 143  * @lock: lock to allow one command at a time
 144  * @complete: internal commands completion
 145  * @tag_wq: wait queue until free command slot is available
 146  */
 147 struct ufs_dev_cmd {
 148         enum dev_cmd_type type;
 149         struct mutex lock;
 150         struct completion *complete;
 151         wait_queue_head_t tag_wq;
 152         struct ufs_query query;
 153 };
 154
 155 /**
 156  * struct ufs_hba - per adapter private structure
 157  * @mmio_base: UFSHCI base register address
 158  * @ucdl_base_addr: UFS Command Descriptor base address
 159  * @utrdl_base_addr: UTP Transfer Request Descriptor base address
 160  * @utmrdl_base_addr: UTP Task Management Descriptor base address
 161  * @ucdl_dma_addr: UFS Command Descriptor DMA address
 162  * @utrdl_dma_addr: UTRDL DMA address
 163  * @utmrdl_dma_addr: UTMRDL DMA address
 164  * @host: Scsi_Host instance of the driver
 165  * @dev: device handle
 166  * @lrb: local reference block
 167  * @lrb_in_use: lrb in use
 168  * @outstanding_tasks: Bits representing outstanding task requests
 169  * @outstanding_reqs: Bits representing outstanding transfer requests
 170  * @capabilities: UFS Controller Capabilities
 171  * @nutrs: Transfer Request Queue depth supported by controller
 172  * @nutmrs: Task Management Queue depth supported by controller
 173  * @ufs_version: UFS Version to which controller complies
 174  * @irq: Irq number of the controller
 175  * @active_uic_cmd: handle of active UIC command
 176  * @uic_cmd_mutex: mutex for uic command
 177  * @ufshcd_tm_wait_queue: wait queue for task management
 178  * @pwr_done: completion for power mode change
 179  * @tm_condition: condition variable for task management
 180  * @ufshcd_state: UFSHCD states
 181  * @intr_mask: Interrupt Mask Bits
 182  * @ee_ctrl_mask: Exception event control mask
 183  * @feh_workq: Work queue for fatal controller error handling
 184  * @eeh_work: Worker to handle exception events
 185  * @errors: HBA errors
 186  * @dev_cmd: ufs device management command information
 187  * @auto_bkops_enabled: to track whether bkops is enabled in device
 188  */
 189 struct ufs_hba {
 190         void __iomem *mmio_base;
 191
 192         /* Virtual memory reference */
 193         struct utp_transfer_cmd_desc *ucdl_base_addr;
 194         struct utp_transfer_req_desc *utrdl_base_addr;
 195         struct utp_task_req_desc *utmrdl_base_addr;
 196
 197         /* DMA memory reference */
 198         dma_addr_t ucdl_dma_addr;
 199         dma_addr_t utrdl_dma_addr;
 200         dma_addr_t utmrdl_dma_addr;
 201
 202         struct Scsi_Host *host;
 203         struct device *dev;
 204
 205         struct ufshcd_lrb *lrb;
 206         unsigned long lrb_in_use;
 207
 208         unsigned long outstanding_tasks;
 209         unsigned long outstanding_reqs;
 210
 211         u32 capabilities;
 212         int nutrs;
 213         int nutmrs;
 214         u32 ufs_version;
 215         unsigned int irq;
 216
 217         struct uic_command *active_uic_cmd;
 218         struct mutex uic_cmd_mutex;
 219
 220         wait_queue_head_t ufshcd_tm_wait_queue;
 221         unsigned long tm_condition;
 222
 223         struct completion *pwr_done;
 224
 225         u32 ufshcd_state;
 226         u32 intr_mask;
 227         u16 ee_ctrl_mask;
 228
 229         /* Work Queues */
 230         struct work_struct feh_workq;
 231         struct work_struct eeh_work;
 232
 233         /* HBA Errors */
 234         u32 errors;
 235
 236         /* Device management request data */
 237         struct ufs_dev_cmd dev_cmd;
 238
 239         bool auto_bkops_enabled;
 240 };
 241
 242 #define ufshcd_writel(hba, val, reg)    \
 243         writel((val), (hba)->mmio_base + (reg))
 244 #define ufshcd_readl(hba, reg)  \
 245         readl((hba)->mmio_base + (reg))
 246
 247 int ufshcd_init(struct device *, struct ufs_hba ** , void __iomem * ,
 248                         unsigned int);
 249 void ufshcd_remove(struct ufs_hba *);
 250
 251 /**
 252  * ufshcd_hba_stop - Send controller to reset state
 253  * @hba: per adapter instance
 254  */
 255 static inline void ufshcd_hba_stop(struct ufs_hba *hba)
 256 {
 257         ufshcd_writel(hba, CONTROLLER_DISABLE,  REG_CONTROLLER_ENABLE);
 258 }
 259
 260 static inline void check_upiu_size(void)
 261 {
 262         BUILD_BUG_ON(ALIGNED_UPIU_SIZE <
 263                 GENERAL_UPIU_REQUEST_SIZE + QUERY_DESC_MAX_SIZE);
 264 }
 265
 266 extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
 267 extern int ufshcd_runtime_resume(struct ufs_hba *hba);
 268 extern int ufshcd_runtime_idle(struct ufs_hba *hba);
 269 extern int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
 270                                u8 attr_set, u32 mib_val, u8 peer);
 271 extern int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
 272                                u32 *mib_val, u8 peer);
 273
 274 /* UIC command interfaces for DME primitives */
 275 #define DME_LOCAL       0
 276 #define DME_PEER        1
 277 #define ATTR_SET_NOR    0       /* NORMAL */
 278 #define ATTR_SET_ST     1       /* STATIC */
 279
 280 static inline int ufshcd_dme_set(struct ufs_hba *hba, u32 attr_sel,
 281                                  u32 mib_val)
 282 {
 283         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
 284                                    mib_val, DME_LOCAL);
 285 }
 286
 287 static inline int ufshcd_dme_st_set(struct ufs_hba *hba, u32 attr_sel,
 288                                     u32 mib_val)
 289 {
 290         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
 291                                    mib_val, DME_LOCAL);
 292 }
 293
 294 static inline int ufshcd_dme_peer_set(struct ufs_hba *hba, u32 attr_sel,
 295                                       u32 mib_val)
 296 {
 297         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
 298                                    mib_val, DME_PEER);
 299 }
 300
 301 static inline int ufshcd_dme_peer_st_set(struct ufs_hba *hba, u32 attr_sel,
 302                                          u32 mib_val)
 303 {
 304         return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
 305                                    mib_val, DME_PEER);
 306 }
 307
 308 static inline int ufshcd_dme_get(struct ufs_hba *hba,
 309                                  u32 attr_sel, u32 *mib_val)
 310 {
 311         return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_LOCAL);
 312 }
 313
 314 static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
 315                                       u32 attr_sel, u32 *mib_val)
 316 {
 317         return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
 318 }
 319
 320 #endif /* End of Header */