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authorSam Bradshaw <sbradshaw@micron.com>2011-08-30 08:34:26 -0600
committerJens Axboe <axboe@kernel.dk>2011-11-05 08:35:10 +0100
commit88523a61558a040546bf7d8b079ae0755d8e7005 (patch)
tree3f12d4ee4d15c93b56e335459794023ef050327e /drivers/block/mtip32xx/mtip32xx.h
parent5c8a0fbba543d9428a486f0d1282bbcf3cf1d95a (diff)
block: Add driver for Micron RealSSD pcie flash cards
This adds mtip32xx, a driver supporting Microns line of pci-express flash storage cards. Signed-off-by: Asai Thambi S P <asamymuthupa@micron.com> Signed-off-by: Sam Bradshaw <sbradshaw@micron.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'drivers/block/mtip32xx/mtip32xx.h')
-rw-r--r--drivers/block/mtip32xx/mtip32xx.h445
1 files changed, 445 insertions, 0 deletions
diff --git a/drivers/block/mtip32xx/mtip32xx.h b/drivers/block/mtip32xx/mtip32xx.h
new file mode 100644
index 00000000000..3423d18e7c8
--- /dev/null
+++ b/drivers/block/mtip32xx/mtip32xx.h
@@ -0,0 +1,445 @@
+/*
+ * 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 "1.2.6os2"
+
+/* 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
+
+/* 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];
+ /*
+ * 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];
+ /* Non-zero if an internal command is in progress. */
+ int internal_cmd_in_progress;
+ /*
+ * 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, ... */
+
+ int protocol; /* FIXME: Protocol ops array index. */
+
+ 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. */
+ /*
+ * Semaphore used to lock out read/write commands during the
+ * execution of an internal command.
+ */
+ struct rw_semaphore internal_sem;
+
+ 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 */
+};
+
+/* Function declarations */
+extern int mtip_block_initialize(struct driver_data *dd);
+extern int mtip_block_remove(struct driver_data *dd);
+extern int mtip_block_shutdown(struct driver_data *dd);
+extern int mtip_block_suspend(struct driver_data *dd);
+extern int mtip_block_resume(struct driver_data *dd);
+extern int mtip_hw_init(struct driver_data *dd);
+extern int mtip_hw_exit(struct driver_data *dd);
+extern int mtip_hw_shutdown(struct driver_data *dd);
+extern bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors);
+extern void mtip_hw_release_scatterlist(
+ struct driver_data *dd,
+ int tag);
+extern struct scatterlist *mtip_hw_get_scatterlist(
+ struct driver_data *dd,
+ int *tag);
+extern void mtip_hw_submit_io(struct driver_data *dd,
+ sector_t start,
+ int nsect,
+ int nents,
+ int tag,
+ void *callback,
+ void *data,
+ int barrier,
+ int dir);
+extern int mtip_hw_ioctl(struct driver_data *dd,
+ unsigned int cmd,
+ unsigned long arg,
+ unsigned char compat);
+extern int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj);
+extern int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj);
+extern int mtip_hw_resume(struct driver_data *dd);
+extern int mtip_hw_suspend(struct driver_data *dd);
+void mtip_command_cleanup(struct driver_data *dd);
+bool mtip_check_surprise_removal(struct pci_dev *pdev);
+void mtip_restart_port(struct mtip_port *port);
+
+#endif