drivers/block/mtip32xx/mtip32xx.h

   1 /*
   2  * mtip32xx.h - Header file for the P320 SSD Block Driver
   3  *   Copyright (C) 2011 Micron Technology, Inc.
   4  *
   5  * Portions of this code were derived from works subjected to the
   6  * following copyright:
   7  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #ifndef __MTIP32XX_H__
  22 #define __MTIP32XX_H__
  23
  24 #include <linux/spinlock.h>
  25 #include <linux/rwsem.h>
  26 #include <linux/ata.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/genhd.h>
  29 #include <linux/version.h>
  30
  31 /* Offset of Subsystem Device ID in pci confoguration space */
  32 #define PCI_SUBSYSTEM_DEVICEID  0x2E
  33
  34 /* offset of Device Control register in PCIe extended capabilites space */
  35 #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET   0x48
  36
  37 /* # of times to retry timed out IOs */
  38 #define MTIP_MAX_RETRIES        5
  39
  40 /* Various timeout values in ms */
  41 #define MTIP_NCQ_COMMAND_TIMEOUT_MS       5000
  42 #define MTIP_IOCTL_COMMAND_TIMEOUT_MS     5000
  43 #define MTIP_INTERNAL_COMMAND_TIMEOUT_MS  5000
  44
  45 /* check for timeouts every 500ms */
  46 #define MTIP_TIMEOUT_CHECK_PERIOD       500
  47
  48 /* ftl rebuild */
  49 #define MTIP_FTL_REBUILD_OFFSET         142
  50 #define MTIP_FTL_REBUILD_MAGIC          0xED51
  51 #define MTIP_FTL_REBUILD_TIMEOUT_MS     2400000
  52
  53 /* Macro to extract the tag bit number from a tag value. */
  54 #define MTIP_TAG_BIT(tag)       (tag & 0x1F)
  55
  56 /*
  57  * Macro to extract the tag index from a tag value. The index
  58  * is used to access the correct s_active/Command Issue register based
  59  * on the tag value.
  60  */
  61 #define MTIP_TAG_INDEX(tag)     (tag >> 5)
  62
  63 /*
  64  * Maximum number of scatter gather entries
  65  * a single command may have.
  66  */
  67 #define MTIP_MAX_SG             128
  68
  69 /*
  70  * Maximum number of slot groups (Command Issue & s_active registers)
  71  * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
  72  */
  73 #define MTIP_MAX_SLOT_GROUPS    8
  74
  75 /* Internal command tag. */
  76 #define MTIP_TAG_INTERNAL       0
  77
  78 /* Micron Vendor ID & P320x SSD Device ID */
  79 #define PCI_VENDOR_ID_MICRON    0x1344
  80 #define P320_DEVICE_ID          0x5150
  81
  82 /* Driver name and version strings */
  83 #define MTIP_DRV_NAME           "mtip32xx"
  84 #define MTIP_DRV_VERSION        "1.2.6os3"
  85
  86 /* Maximum number of minor device numbers per device. */
  87 #define MTIP_MAX_MINORS         16
  88
  89 /* Maximum number of supported command slots. */
  90 #define MTIP_MAX_COMMAND_SLOTS  (MTIP_MAX_SLOT_GROUPS * 32)
  91
  92 /*
  93  * Per-tag bitfield size in longs.
  94  * Linux bit manipulation functions
  95  * (i.e. test_and_set_bit, find_next_zero_bit)
  96  * manipulate memory in longs, so we try to make the math work.
  97  * take the slot groups and find the number of longs, rounding up.
  98  * Careful! i386 and x86_64 use different size longs!
  99  */
 100 #define U32_PER_LONG    (sizeof(long) / sizeof(u32))
 101 #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
 102                                         (U32_PER_LONG-1))/U32_PER_LONG)
 103
 104 /* BAR number used to access the HBA registers. */
 105 #define MTIP_ABAR               5
 106
 107 #ifdef DEBUG
 108  #define dbg_printk(format, arg...)     \
 109         printk(pr_fmt(format), ##arg);
 110 #else
 111  #define dbg_printk(format, arg...)
 112 #endif
 113
 114 #define __force_bit2int (unsigned int __force)
 115
 116 /* below are bit numbers in 'flags' defined in mtip_port */
 117 #define MTIP_FLAG_IC_ACTIVE_BIT                 0
 118 #define MTIP_FLAG_EH_ACTIVE_BIT                 1
 119 #define MTIP_FLAG_SVC_THD_ACTIVE_BIT            2
 120 #define MTIP_FLAG_ISSUE_CMDS_BIT                4
 121 #define MTIP_FLAG_REBUILD_BIT                   5
 122 #define MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT       8
 123
 124 /* Register Frame Information Structure (FIS), host to device. */
 125 struct host_to_dev_fis {
 126         /*
 127          * FIS type.
 128          * - 27h Register FIS, host to device.
 129          * - 34h Register FIS, device to host.
 130          * - 39h DMA Activate FIS, device to host.
 131          * - 41h DMA Setup FIS, bi-directional.
 132          * - 46h Data FIS, bi-directional.
 133          * - 58h BIST Activate FIS, bi-directional.
 134          * - 5Fh PIO Setup FIS, device to host.
 135          * - A1h Set Device Bits FIS, device to host.
 136          */
 137         unsigned char type;
 138         unsigned char opts;
 139         unsigned char command;
 140         unsigned char features;
 141
 142         union {
 143                 unsigned char lba_low;
 144                 unsigned char sector;
 145         };
 146         union {
 147                 unsigned char lba_mid;
 148                 unsigned char cyl_low;
 149         };
 150         union {
 151                 unsigned char lba_hi;
 152                 unsigned char cyl_hi;
 153         };
 154         union {
 155                 unsigned char device;
 156                 unsigned char head;
 157         };
 158
 159         union {
 160                 unsigned char lba_low_ex;
 161                 unsigned char sector_ex;
 162         };
 163         union {
 164                 unsigned char lba_mid_ex;
 165                 unsigned char cyl_low_ex;
 166         };
 167         union {
 168                 unsigned char lba_hi_ex;
 169                 unsigned char cyl_hi_ex;
 170         };
 171         unsigned char features_ex;
 172
 173         unsigned char sect_count;
 174         unsigned char sect_cnt_ex;
 175         unsigned char res2;
 176         unsigned char control;
 177
 178         unsigned int res3;
 179 };
 180
 181 /* Command header structure. */
 182 struct mtip_cmd_hdr {
 183         /*
 184          * Command options.
 185          * - Bits 31:16 Number of PRD entries.
 186          * - Bits 15:8 Unused in this implementation.
 187          * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
 188          * - Bit 6 Write bit, should be set when writing data to the device.
 189          * - Bit 5 Unused in this implementation.
 190          * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
 191          */
 192         unsigned int opts;
 193         /* This field is unsed when using NCQ. */
 194         union {
 195                 unsigned int byte_count;
 196                 unsigned int status;
 197         };
 198         /*
 199          * Lower 32 bits of the command table address associated with this
 200          * header. The command table addresses must be 128 byte aligned.
 201          */
 202         unsigned int ctba;
 203         /*
 204          * If 64 bit addressing is used this field is the upper 32 bits
 205          * of the command table address associated with this command.
 206          */
 207         unsigned int ctbau;
 208         /* Reserved and unused. */
 209         unsigned int res[4];
 210 };
 211
 212 /* Command scatter gather structure (PRD). */
 213 struct mtip_cmd_sg {
 214         /*
 215          * Low 32 bits of the data buffer address. For P320 this
 216          * address must be 8 byte aligned signified by bits 2:0 being
 217          * set to 0.
 218          */
 219         unsigned int dba;
 220         /*
 221          * When 64 bit addressing is used this field is the upper
 222          * 32 bits of the data buffer address.
 223          */
 224         unsigned int dba_upper;
 225         /* Unused. */
 226         unsigned int reserved;
 227         /*
 228          * Bit 31: interrupt when this data block has been transferred.
 229          * Bits 30..22: reserved
 230          * Bits 21..0: byte count (minus 1).  For P320 the byte count must be
 231          * 8 byte aligned signified by bits 2:0 being set to 1.
 232          */
 233         unsigned int info;
 234 };
 235 struct mtip_port;
 236
 237 /* Structure used to describe a command. */
 238 struct mtip_cmd {
 239
 240         struct mtip_cmd_hdr *command_header; /* ptr to command header entry */
 241
 242         dma_addr_t command_header_dma; /* corresponding physical address */
 243
 244         void *command; /* ptr to command table entry */
 245
 246         dma_addr_t command_dma; /* corresponding physical address */
 247
 248         void *comp_data; /* data passed to completion function comp_func() */
 249         /*
 250          * Completion function called by the ISR upon completion of
 251          * a command.
 252          */
 253         void (*comp_func)(struct mtip_port *port,
 254                                 int tag,
 255                                 void *data,
 256                                 int status);
 257         /* Additional callback function that may be called by comp_func() */
 258         void (*async_callback)(void *data, int status);
 259
 260         void *async_data; /* Addl. data passed to async_callback() */
 261
 262         int scatter_ents; /* Number of scatter list entries used */
 263
 264         struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
 265
 266         int retries; /* The number of retries left for this command. */
 267
 268         int direction; /* Data transfer direction */
 269
 270         unsigned long comp_time; /* command completion time, in jiffies */
 271
 272         atomic_t active; /* declares if this command sent to the drive. */
 273 };
 274
 275 /* Structure used to describe a port. */
 276 struct mtip_port {
 277         /* Pointer back to the driver data for this port. */
 278         struct driver_data *dd;
 279         /*
 280          * Used to determine if the data pointed to by the
 281          * identify field is valid.
 282          */
 283         unsigned long identify_valid;
 284         /* Base address of the memory mapped IO for the port. */
 285         void __iomem *mmio;
 286         /* Array of pointers to the memory mapped s_active registers. */
 287         void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
 288         /* Array of pointers to the memory mapped completed registers. */
 289         void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
 290         /* Array of pointers to the memory mapped Command Issue registers. */
 291         void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
 292         /*
 293          * Pointer to the beginning of the command header memory as used
 294          * by the driver.
 295          */
 296         void *command_list;
 297         /*
 298          * Pointer to the beginning of the command header memory as used
 299          * by the DMA.
 300          */
 301         dma_addr_t command_list_dma;
 302         /*
 303          * Pointer to the beginning of the RX FIS memory as used
 304          * by the driver.
 305          */
 306         void *rxfis;
 307         /*
 308          * Pointer to the beginning of the RX FIS memory as used
 309          * by the DMA.
 310          */
 311         dma_addr_t rxfis_dma;
 312         /*
 313          * Pointer to the beginning of the command table memory as used
 314          * by the driver.
 315          */
 316         void *command_table;
 317         /*
 318          * Pointer to the beginning of the command table memory as used
 319          * by the DMA.
 320          */
 321         dma_addr_t command_tbl_dma;
 322         /*
 323          * Pointer to the beginning of the identify data memory as used
 324          * by the driver.
 325          */
 326         u16 *identify;
 327         /*
 328          * Pointer to the beginning of the identify data memory as used
 329          * by the DMA.
 330          */
 331         dma_addr_t identify_dma;
 332         /*
 333          * Pointer to the beginning of a sector buffer that is used
 334          * by the driver when issuing internal commands.
 335          */
 336         u16 *sector_buffer;
 337         /*
 338          * Pointer to the beginning of a sector buffer that is used
 339          * by the DMA when the driver issues internal commands.
 340          */
 341         dma_addr_t sector_buffer_dma;
 342         /*
 343          * Bit significant, used to determine if a command slot has
 344          * been allocated. i.e. the slot is in use.  Bits are cleared
 345          * when the command slot and all associated data structures
 346          * are no longer needed.
 347          */
 348         unsigned long allocated[SLOTBITS_IN_LONGS];
 349         /*
 350          * used to queue commands when an internal command is in progress
 351          * or error handling is active
 352          */
 353         unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
 354         /*
 355          * Array of command slots. Structure includes pointers to the
 356          * command header and command table, and completion function and data
 357          * pointers.
 358          */
 359         struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS];
 360         /* Used by mtip_service_thread to wait for an event */
 361         wait_queue_head_t svc_wait;
 362         /*
 363          * indicates the state of the port. Also, helps the service thread
 364          * to determine its action on wake up.
 365          */
 366         unsigned long flags;
 367         /*
 368          * Timer used to complete commands that have been active for too long.
 369          */
 370         struct timer_list cmd_timer;
 371         /*
 372          * Semaphore used to block threads if there are no
 373          * command slots available.
 374          */
 375         struct semaphore cmd_slot;
 376         /* Spinlock for working around command-issue bug. */
 377         spinlock_t cmd_issue_lock;
 378 };
 379
 380 /*
 381  * Driver private data structure.
 382  *
 383  * One structure is allocated per probed device.
 384  */
 385 struct driver_data {
 386         void __iomem *mmio; /* Base address of the HBA registers. */
 387
 388         int major; /* Major device number. */
 389
 390         int instance; /* Instance number. First device probed is 0, ... */
 391
 392         struct gendisk *disk; /* Pointer to our gendisk structure. */
 393
 394         struct pci_dev *pdev; /* Pointer to the PCI device structure. */
 395
 396         struct request_queue *queue; /* Our request queue. */
 397
 398         struct mtip_port *port; /* Pointer to the port data structure. */
 399
 400         /* Tasklet used to process the bottom half of the ISR. */
 401         struct tasklet_struct tasklet;
 402
 403         unsigned product_type; /* magic value declaring the product type */
 404
 405         unsigned slot_groups; /* number of slot groups the product supports */
 406
 407         atomic_t drv_cleanup_done; /* Atomic variable for SRSI */
 408
 409         unsigned long index; /* Index to determine the disk name */
 410
 411         unsigned int ftlrebuildflag; /* FTL rebuild flag */
 412
 413         atomic_t resumeflag; /* Atomic variable to track suspend/resume */
 414
 415         struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
 416 };
 417
 418 #endif