2 * mtip32xx.h - Header file for the P320 SSD Block Driver
3 * Copyright (C) 2011 Micron Technology, Inc.
5 * Portions of this code were derived from works subjected to the
7 * Copyright (C) 2009 Integrated Device Technology, Inc.
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.
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.
21 #ifndef __MTIP32XX_H__
22 #define __MTIP32XX_H__
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>
30 /* Offset of Subsystem Device ID in pci confoguration space */
31 #define PCI_SUBSYSTEM_DEVICEID 0x2E
33 /* offset of Device Control register in PCIe extended capabilites space */
34 #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET 0x48
36 /* # of times to retry timed out/failed IOs */
37 #define MTIP_MAX_RETRIES 2
39 /* Various timeout values in ms */
40 #define MTIP_NCQ_COMMAND_TIMEOUT_MS 5000
41 #define MTIP_IOCTL_COMMAND_TIMEOUT_MS 5000
42 #define MTIP_INTERNAL_COMMAND_TIMEOUT_MS 5000
44 /* check for timeouts every 500ms */
45 #define MTIP_TIMEOUT_CHECK_PERIOD 500
48 #define MTIP_FTL_REBUILD_OFFSET 142
49 #define MTIP_FTL_REBUILD_MAGIC 0xED51
50 #define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000
52 /* Macro to extract the tag bit number from a tag value. */
53 #define MTIP_TAG_BIT(tag) (tag & 0x1F)
56 * Macro to extract the tag index from a tag value. The index
57 * is used to access the correct s_active/Command Issue register based
60 #define MTIP_TAG_INDEX(tag) (tag >> 5)
63 * Maximum number of scatter gather entries
64 * a single command may have.
66 #define MTIP_MAX_SG 128
69 * Maximum number of slot groups (Command Issue & s_active registers)
70 * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
72 #define MTIP_MAX_SLOT_GROUPS 8
74 /* Internal command tag. */
75 #define MTIP_TAG_INTERNAL 0
77 /* Micron Vendor ID & P320x SSD Device ID */
78 #define PCI_VENDOR_ID_MICRON 0x1344
79 #define P320_DEVICE_ID 0x5150
81 /* Driver name and version strings */
82 #define MTIP_DRV_NAME "mtip32xx"
83 #define MTIP_DRV_VERSION "1.2.6os3"
85 /* Maximum number of minor device numbers per device. */
86 #define MTIP_MAX_MINORS 16
88 /* Maximum number of supported command slots. */
89 #define MTIP_MAX_COMMAND_SLOTS (MTIP_MAX_SLOT_GROUPS * 32)
92 * Per-tag bitfield size in longs.
93 * Linux bit manipulation functions
94 * (i.e. test_and_set_bit, find_next_zero_bit)
95 * manipulate memory in longs, so we try to make the math work.
96 * take the slot groups and find the number of longs, rounding up.
97 * Careful! i386 and x86_64 use different size longs!
99 #define U32_PER_LONG (sizeof(long) / sizeof(u32))
100 #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
101 (U32_PER_LONG-1))/U32_PER_LONG)
103 /* BAR number used to access the HBA registers. */
107 #define dbg_printk(format, arg...) \
108 printk(pr_fmt(format), ##arg);
110 #define dbg_printk(format, arg...)
113 #define MTIP_DFS_MAX_BUF_SIZE 1024
115 #define __force_bit2int (unsigned int __force)
118 /* below are bit numbers in 'flags' defined in mtip_port */
119 MTIP_PF_IC_ACTIVE_BIT = 0, /* pio/ioctl */
120 MTIP_PF_EH_ACTIVE_BIT = 1, /* error handling */
121 MTIP_PF_SE_ACTIVE_BIT = 2, /* secure erase */
122 MTIP_PF_DM_ACTIVE_BIT = 3, /* download microcde */
123 MTIP_PF_PAUSE_IO = ((1 << MTIP_PF_IC_ACTIVE_BIT) | \
124 (1 << MTIP_PF_EH_ACTIVE_BIT) | \
125 (1 << MTIP_PF_SE_ACTIVE_BIT) | \
126 (1 << MTIP_PF_DM_ACTIVE_BIT)),
128 MTIP_PF_SVC_THD_ACTIVE_BIT = 4,
129 MTIP_PF_ISSUE_CMDS_BIT = 5,
130 MTIP_PF_REBUILD_BIT = 6,
131 MTIP_PF_SVC_THD_STOP_BIT = 8,
133 /* below are bit numbers in 'dd_flag' defined in driver_data */
134 MTIP_DDF_REMOVE_PENDING_BIT = 1,
135 MTIP_DDF_OVER_TEMP_BIT = 2,
136 MTIP_DDF_WRITE_PROTECT_BIT = 3,
137 MTIP_DDF_STOP_IO = ((1 << MTIP_DDF_REMOVE_PENDING_BIT) | \
138 (1 << MTIP_DDF_OVER_TEMP_BIT) | \
139 (1 << MTIP_DDF_WRITE_PROTECT_BIT)),
141 MTIP_DDF_CLEANUP_BIT = 5,
142 MTIP_DDF_RESUME_BIT = 6,
143 MTIP_DDF_INIT_DONE_BIT = 7,
144 MTIP_DDF_REBUILD_FAILED_BIT = 8,
147 __packed struct smart_attr{
156 /* Register Frame Information Structure (FIS), host to device. */
157 struct host_to_dev_fis {
160 * - 27h Register FIS, host to device.
161 * - 34h Register FIS, device to host.
162 * - 39h DMA Activate FIS, device to host.
163 * - 41h DMA Setup FIS, bi-directional.
164 * - 46h Data FIS, bi-directional.
165 * - 58h BIST Activate FIS, bi-directional.
166 * - 5Fh PIO Setup FIS, device to host.
167 * - A1h Set Device Bits FIS, device to host.
171 unsigned char command;
172 unsigned char features;
175 unsigned char lba_low;
176 unsigned char sector;
179 unsigned char lba_mid;
180 unsigned char cyl_low;
183 unsigned char lba_hi;
184 unsigned char cyl_hi;
187 unsigned char device;
192 unsigned char lba_low_ex;
193 unsigned char sector_ex;
196 unsigned char lba_mid_ex;
197 unsigned char cyl_low_ex;
200 unsigned char lba_hi_ex;
201 unsigned char cyl_hi_ex;
203 unsigned char features_ex;
205 unsigned char sect_count;
206 unsigned char sect_cnt_ex;
208 unsigned char control;
213 /* Command header structure. */
214 struct mtip_cmd_hdr {
217 * - Bits 31:16 Number of PRD entries.
218 * - Bits 15:8 Unused in this implementation.
219 * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
220 * - Bit 6 Write bit, should be set when writing data to the device.
221 * - Bit 5 Unused in this implementation.
222 * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
225 /* This field is unsed when using NCQ. */
227 unsigned int byte_count;
231 * Lower 32 bits of the command table address associated with this
232 * header. The command table addresses must be 128 byte aligned.
236 * If 64 bit addressing is used this field is the upper 32 bits
237 * of the command table address associated with this command.
240 /* Reserved and unused. */
244 /* Command scatter gather structure (PRD). */
247 * Low 32 bits of the data buffer address. For P320 this
248 * address must be 8 byte aligned signified by bits 2:0 being
253 * When 64 bit addressing is used this field is the upper
254 * 32 bits of the data buffer address.
256 unsigned int dba_upper;
258 unsigned int reserved;
260 * Bit 31: interrupt when this data block has been transferred.
261 * Bits 30..22: reserved
262 * Bits 21..0: byte count (minus 1). For P320 the byte count must be
263 * 8 byte aligned signified by bits 2:0 being set to 1.
269 /* Structure used to describe a command. */
272 struct mtip_cmd_hdr *command_header; /* ptr to command header entry */
274 dma_addr_t command_header_dma; /* corresponding physical address */
276 void *command; /* ptr to command table entry */
278 dma_addr_t command_dma; /* corresponding physical address */
280 void *comp_data; /* data passed to completion function comp_func() */
282 * Completion function called by the ISR upon completion of
285 void (*comp_func)(struct mtip_port *port,
289 /* Additional callback function that may be called by comp_func() */
290 void (*async_callback)(void *data, int status);
292 void *async_data; /* Addl. data passed to async_callback() */
294 int scatter_ents; /* Number of scatter list entries used */
296 struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
298 int retries; /* The number of retries left for this command. */
300 int direction; /* Data transfer direction */
302 unsigned long comp_time; /* command completion time, in jiffies */
304 atomic_t active; /* declares if this command sent to the drive. */
307 /* Structure used to describe a port. */
309 /* Pointer back to the driver data for this port. */
310 struct driver_data *dd;
312 * Used to determine if the data pointed to by the
313 * identify field is valid.
315 unsigned long identify_valid;
316 /* Base address of the memory mapped IO for the port. */
318 /* Array of pointers to the memory mapped s_active registers. */
319 void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
320 /* Array of pointers to the memory mapped completed registers. */
321 void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
322 /* Array of pointers to the memory mapped Command Issue registers. */
323 void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
325 * Pointer to the beginning of the command header memory as used
330 * Pointer to the beginning of the command header memory as used
333 dma_addr_t command_list_dma;
335 * Pointer to the beginning of the RX FIS memory as used
340 * Pointer to the beginning of the RX FIS memory as used
343 dma_addr_t rxfis_dma;
345 * Pointer to the beginning of the command table memory as used
350 * Pointer to the beginning of the command table memory as used
353 dma_addr_t command_tbl_dma;
355 * Pointer to the beginning of the identify data memory as used
360 * Pointer to the beginning of the identify data memory as used
363 dma_addr_t identify_dma;
365 * Pointer to the beginning of a sector buffer that is used
366 * by the driver when issuing internal commands.
370 * Pointer to the beginning of a sector buffer that is used
371 * by the DMA when the driver issues internal commands.
373 dma_addr_t sector_buffer_dma;
375 * Bit significant, used to determine if a command slot has
376 * been allocated. i.e. the slot is in use. Bits are cleared
377 * when the command slot and all associated data structures
378 * are no longer needed.
381 dma_addr_t log_buf_dma;
384 dma_addr_t smart_buf_dma;
386 unsigned long allocated[SLOTBITS_IN_LONGS];
388 * used to queue commands when an internal command is in progress
389 * or error handling is active
391 unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
393 * Array of command slots. Structure includes pointers to the
394 * command header and command table, and completion function and data
397 struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS];
398 /* Used by mtip_service_thread to wait for an event */
399 wait_queue_head_t svc_wait;
401 * indicates the state of the port. Also, helps the service thread
402 * to determine its action on wake up.
406 * Timer used to complete commands that have been active for too long.
408 struct timer_list cmd_timer;
409 unsigned long ic_pause_timer;
411 * Semaphore used to block threads if there are no
412 * command slots available.
414 struct semaphore cmd_slot;
415 /* Spinlock for working around command-issue bug. */
416 spinlock_t cmd_issue_lock;
420 * Driver private data structure.
422 * One structure is allocated per probed device.
425 void __iomem *mmio; /* Base address of the HBA registers. */
427 int major; /* Major device number. */
429 int instance; /* Instance number. First device probed is 0, ... */
431 struct gendisk *disk; /* Pointer to our gendisk structure. */
433 struct pci_dev *pdev; /* Pointer to the PCI device structure. */
435 struct request_queue *queue; /* Our request queue. */
437 struct mtip_port *port; /* Pointer to the port data structure. */
439 /* Tasklet used to process the bottom half of the ISR. */
440 struct tasklet_struct tasklet;
442 unsigned product_type; /* magic value declaring the product type */
444 unsigned slot_groups; /* number of slot groups the product supports */
446 unsigned long index; /* Index to determine the disk name */
448 unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
450 struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
452 struct dentry *dfs_node;