/* * mtip32xx.h - Header file for the P320 SSD Block Driver * Copyright (C) 2011 Micron Technology, Inc. * * Portions of this code were derived from works subjected to the * following copyright: * Copyright (C) 2009 Integrated Device Technology, Inc. * * 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. * * 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. * */ #ifndef __MTIP32XX_H__ #define __MTIP32XX_H__ #include <linux/spinlock.h> #include <linux/rwsem.h> #include <linux/ata.h> #include <linux/interrupt.h> #include <linux/genhd.h> #include <linux/version.h> /* Offset of Subsystem Device ID in pci confoguration space */ #define PCI_SUBSYSTEM_DEVICEID 0x2E /* offset of Device Control register in PCIe extended capabilites space */ #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET 0x48 /* # of times to retry timed out IOs */ #define MTIP_MAX_RETRIES 5 /* Various timeout values in ms */ #define MTIP_NCQ_COMMAND_TIMEOUT_MS 5000 #define MTIP_IOCTL_COMMAND_TIMEOUT_MS 5000 #define MTIP_INTERNAL_COMMAND_TIMEOUT_MS 5000 /* check for timeouts every 500ms */ #define MTIP_TIMEOUT_CHECK_PERIOD 500 /* ftl rebuild */ #define MTIP_FTL_REBUILD_OFFSET 142 #define MTIP_FTL_REBUILD_MAGIC 0xED51 #define MTIP_FTL_REBUILD_TIMEOUT_MS 2400000 /* Macro to extract the tag bit number from a tag value. */ #define MTIP_TAG_BIT(tag) (tag & 0x1F) /* * Macro to extract the tag index from a tag value. The index * is used to access the correct s_active/Command Issue register based * on the tag value. */ #define MTIP_TAG_INDEX(tag) (tag >> 5) /* * Maximum number of scatter gather entries * a single command may have. */ #define MTIP_MAX_SG 128 /* * Maximum number of slot groups (Command Issue & s_active registers) * NOTE: This is the driver maximum; check dd->slot_groups for actual value. */ #define MTIP_MAX_SLOT_GROUPS 8 /* Internal command tag. */ #define MTIP_TAG_INTERNAL 0 /* Micron Vendor ID & P320x SSD Device ID */ #define PCI_VENDOR_ID_MICRON 0x1344 #define P320_DEVICE_ID 0x5150 /* Driver name and version strings */ #define MTIP_DRV_NAME "mtip32xx" #define MTIP_DRV_VERSION "1.2.6os3" /* Maximum number of minor device numbers per device. */ #define MTIP_MAX_MINORS 16 /* Maximum number of supported command slots. */ #define MTIP_MAX_COMMAND_SLOTS (MTIP_MAX_SLOT_GROUPS * 32) /* * Per-tag bitfield size in longs. * Linux bit manipulation functions * (i.e. test_and_set_bit, find_next_zero_bit) * manipulate memory in longs, so we try to make the math work. * take the slot groups and find the number of longs, rounding up. * Careful! i386 and x86_64 use different size longs! */ #define U32_PER_LONG (sizeof(long) / sizeof(u32)) #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \ (U32_PER_LONG-1))/U32_PER_LONG) /* BAR number used to access the HBA registers. */ #define MTIP_ABAR 5 /* Forced Unit Access Bit */ #define FUA_BIT 0x80 #ifdef DEBUG #define dbg_printk(format, arg...) \ printk(pr_fmt(format), ##arg); #else #define dbg_printk(format, arg...) #endif #define __force_bit2int (unsigned int __force) /* below are bit numbers in 'flags' defined in mtip_port */ #define MTIP_FLAG_IC_ACTIVE_BIT 0 #define MTIP_FLAG_EH_ACTIVE_BIT 1 #define MTIP_FLAG_SVC_THD_ACTIVE_BIT 2 #define MTIP_FLAG_ISSUE_CMDS_BIT 4 #define MTIP_FLAG_REBUILD_BIT 5 #define MTIP_FLAG_SVC_THD_SHOULD_STOP_BIT 8 /* Register Frame Information Structure (FIS), host to device. */ struct host_to_dev_fis { /* * FIS type. * - 27h Register FIS, host to device. * - 34h Register FIS, device to host. * - 39h DMA Activate FIS, device to host. * - 41h DMA Setup FIS, bi-directional. * - 46h Data FIS, bi-directional. * - 58h BIST Activate FIS, bi-directional. * - 5Fh PIO Setup FIS, device to host. * - A1h Set Device Bits FIS, device to host. */ unsigned char type; unsigned char opts; unsigned char command; unsigned char features; union { unsigned char lba_low; unsigned char sector; }; union { unsigned char lba_mid; unsigned char cyl_low; }; union { unsigned char lba_hi; unsigned char cyl_hi; }; union { unsigned char device; unsigned char head; }; union { unsigned char lba_low_ex; unsigned char sector_ex; }; union { unsigned char lba_mid_ex; unsigned char cyl_low_ex; }; union { unsigned char lba_hi_ex; unsigned char cyl_hi_ex; }; unsigned char features_ex; unsigned char sect_count; unsigned char sect_cnt_ex; unsigned char res2; unsigned char control; unsigned int res3; }; /* Command header structure. */ struct mtip_cmd_hdr { /* * Command options. * - Bits 31:16 Number of PRD entries. * - Bits 15:8 Unused in this implementation. * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries. * - Bit 6 Write bit, should be set when writing data to the device. * - Bit 5 Unused in this implementation. * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes). */ unsigned int opts; /* This field is unsed when using NCQ. */ union { unsigned int byte_count; unsigned int status; }; /* * Lower 32 bits of the command table address associated with this * header. The command table addresses must be 128 byte aligned. */ unsigned int ctba; /* * If 64 bit addressing is used this field is the upper 32 bits * of the command table address associated with this command. */ unsigned int ctbau; /* Reserved and unused. */ unsigned int res[4]; }; /* Command scatter gather structure (PRD). */ struct mtip_cmd_sg { /* * Low 32 bits of the data buffer address. For P320 this * address must be 8 byte aligned signified by bits 2:0 being * set to 0. */ unsigned int dba; /* * When 64 bit addressing is used this field is the upper * 32 bits of the data buffer address. */ unsigned int dba_upper; /* Unused. */ unsigned int reserved; /* * Bit 31: interrupt when this data block has been transferred. * Bits 30..22: reserved * Bits 21..0: byte count (minus 1). For P320 the byte count must be * 8 byte aligned signified by bits 2:0 being set to 1. */ unsigned int info; }; struct mtip_port; /* Structure used to describe a command. */ struct mtip_cmd { struct mtip_cmd_hdr *command_header; /* ptr to command header entry */ dma_addr_t command_header_dma; /* corresponding physical address */ void *command; /* ptr to command table entry */ dma_addr_t command_dma; /* corresponding physical address */ void *comp_data; /* data passed to completion function comp_func() */ /* * Completion function called by the ISR upon completion of * a command. */ void (*comp_func)(struct mtip_port *port, int tag, void *data, int status); /* Additional callback function that may be called by comp_func() */ void (*async_callback)(void *data, int status); void *async_data; /* Addl. data passed to async_callback() */ int scatter_ents; /* Number of scatter list entries used */ struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */ int retries; /* The number of retries left for this command. */ int direction; /* Data transfer direction */ unsigned long comp_time; /* command completion time, in jiffies */ atomic_t active; /* declares if this command sent to the drive. */ }; /* Structure used to describe a port. */ struct mtip_port { /* Pointer back to the driver data for this port. */ struct driver_data *dd; /* * Used to determine if the data pointed to by the * identify field is valid. */ unsigned long identify_valid; /* Base address of the memory mapped IO for the port. */ void __iomem *mmio; /* Array of pointers to the memory mapped s_active registers. */ void __iomem *s_active[MTIP_MAX_SLOT_GROUPS]; /* Array of pointers to the memory mapped completed registers. */ void __iomem *completed[MTIP_MAX_SLOT_GROUPS]; /* Array of pointers to the memory mapped Command Issue registers. */ void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS]; /* * Pointer to the beginning of the command header memory as used * by the driver. */ void *command_list; /* * Pointer to the beginning of the command header memory as used * by the DMA. */ dma_addr_t command_list_dma; /* * Pointer to the beginning of the RX FIS memory as used * by the driver. */ void *rxfis; /* * Pointer to the beginning of the RX FIS memory as used * by the DMA. */ dma_addr_t rxfis_dma; /* * Pointer to the beginning of the command table memory as used * by the driver. */ void *command_table; /* * Pointer to the beginning of the command table memory as used * by the DMA. */ dma_addr_t command_tbl_dma; /* * Pointer to the beginning of the identify data memory as used * by the driver. */ u16 *identify; /* * Pointer to the beginning of the identify data memory as used * by the DMA. */ dma_addr_t identify_dma; /* * Pointer to the beginning of a sector buffer that is used * by the driver when issuing internal commands. */ u16 *sector_buffer; /* * Pointer to the beginning of a sector buffer that is used * by the DMA when the driver issues internal commands. */ dma_addr_t sector_buffer_dma; /* * Bit significant, used to determine if a command slot has * been allocated. i.e. the slot is in use. Bits are cleared * when the command slot and all associated data structures * are no longer needed. */ unsigned long allocated[SLOTBITS_IN_LONGS]; /* * used to queue commands when an internal command is in progress * or error handling is active */ unsigned long cmds_to_issue[SLOTBITS_IN_LONGS]; /* * Array of command slots. Structure includes pointers to the * command header and command table, and completion function and data * pointers. */ struct mtip_cmd commands[MTIP_MAX_COMMAND_SLOTS]; /* Used by mtip_service_thread to wait for an event */ wait_queue_head_t svc_wait; /* * indicates the state of the port. Also, helps the service thread * to determine its action on wake up. */ unsigned long flags; /* * Timer used to complete commands that have been active for too long. */ struct timer_list cmd_timer; /* * Semaphore used to block threads if there are no * command slots available. */ struct semaphore cmd_slot; /* Spinlock for working around command-issue bug. */ spinlock_t cmd_issue_lock; }; /* * Driver private data structure. * * One structure is allocated per probed device. */ struct driver_data { void __iomem *mmio; /* Base address of the HBA registers. */ int major; /* Major device number. */ int instance; /* Instance number. First device probed is 0, ... */ struct gendisk *disk; /* Pointer to our gendisk structure. */ struct pci_dev *pdev; /* Pointer to the PCI device structure. */ struct request_queue *queue; /* Our request queue. */ struct mtip_port *port; /* Pointer to the port data structure. */ /* Tasklet used to process the bottom half of the ISR. */ struct tasklet_struct tasklet; unsigned product_type; /* magic value declaring the product type */ unsigned slot_groups; /* number of slot groups the product supports */ atomic_t drv_cleanup_done; /* Atomic variable for SRSI */ unsigned long index; /* Index to determine the disk name */ unsigned int ftlrebuildflag; /* FTL rebuild flag */ atomic_t resumeflag; /* Atomic variable to track suspend/resume */ atomic_t eh_active; /* Flag for error handling tracking */ struct task_struct *mtip_svc_handler; /* task_struct of svc thd */ }; #endif