1 files changed, 423 insertions, 0 deletions

diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
new file mode 100644
index 00000000000..723d7c4946d
--- /dev/null
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -0,0 +1,423 @@
+/*
+ * 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