eata.c

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 *
 *  The default value is: "eata=lc:n,mq:16,tm:0,et:n,rs:n".
 *  An example using the list of detection probes could be:
 *  "eata=0x7410,0x230,lc:y,tm:2,mq:4,et:n".
 *
 *  When loading as a module, parameters can be specified as well.
 *  The above example would be (use 1 in place of y and 0 in place of n):
 *
 *  modprobe eata io_port=0x7410,0x230 linked_comm=1 \
 *                max_queue_depth=4 ext_tran=0 tag_mode=2 \
 *                rev_scan=1
 *
 *  ----------------------------------------------------------------------------
 *  In this implementation, linked commands are designed to work with any DISK
 *  or CD-ROM, since this linking has only the intent of clustering (time-wise)
 *  and reordering by elevator sorting commands directed to each device,
 *  without any relation with the actual SCSI protocol between the controller
 *  and the device.
 *  If Q is the queue depth reported at boot time for each device (also named
 *  cmds/lun) and Q > 2, whenever there is already an active command to the
 *  device all other commands to the same device  (up to Q-1) are kept waiting
 *  in the elevator sorting queue. When the active command completes, the
 *  commands in this queue are sorted by sector address. The sort is chosen
 *  between increasing or decreasing by minimizing the seek distance between
 *  the sector of the commands just completed and the sector of the first
 *  command in the list to be sorted.
 *  Trivial math assures that the unsorted average seek distance when doing
 *  random seeks over S sectors is S/3.
 *  When (Q-1) requests are uniformly distributed over S sectors, the average
 *  distance between two adjacent requests is S/((Q-1) + 1), so the sorted
 *  average seek distance for (Q-1) random requests over S sectors is S/Q.
 *  The elevator sorting hence divides the seek distance by a factor Q/3.
 *  The above pure geometric remarks are valid in all cases and the
 *  driver effectively reduces the seek distance by the predicted factor
 *  when there are Q concurrent read i/o operations on the device, but this
 *  does not necessarily results in a noticeable performance improvement:
 *  your mileage may vary....
 *
 *  Note: command reordering inside a batch of queued commands could cause
 *        wrong results only if there is at least one write request and the
 *        intersection (sector-wise) of all requests is not empty.
 *        When the driver detects a batch including overlapping requests
 *        (a really rare event) strict serial (pid) order is enforced.
 *  ----------------------------------------------------------------------------
 *  The extended translation option (et:y) is useful when using large physical
 *  disks/arrays. It could also be useful when switching between Adaptec boards
 *  and DPT boards without reformatting the disk.
 *  When a boot disk is partitioned with extended translation, in order to
 *  be able to boot it with a DPT board is could be necessary to add to
 *  lilo.conf additional commands as in the following example:
 *
 *  fix-table
 *  disk=/dev/sda bios=0x80 sectors=63 heads=128 cylindres=546
 *
 *  where the above geometry should be replaced with the one reported at
 *  power up by the DPT controller.
 *  ----------------------------------------------------------------------------
 *
 *  The boards are named EATA0, EATA1,... according to the detection order.
 *
 *  In order to support multiple ISA boards in a reliable way,
 *  the driver sets host->wish_block = 1 for all ISA boards.
 */

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/blkdev.h>
#include <linux/interrupt.h>
#include <linux/stat.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <asm/byteorder.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
#include <scsi/scsicam.h>

static int eata2x_detect(struct scsi_host_template *);
static int eata2x_release(struct Scsi_Host *);
static int eata2x_queuecommand(struct scsi_cmnd *,
			       void (*done) (struct scsi_cmnd *));
static int eata2x_eh_abort(struct scsi_cmnd *);
static int eata2x_eh_host_reset(struct scsi_cmnd *);
static int eata2x_bios_param(struct scsi_device *, struct block_device *,
			     sector_t, int *);
static int eata2x_slave_configure(struct scsi_device *);

static struct scsi_host_template driver_template = {
	.name = "EATA/DMA 2.0x rev. 8.10.00 ",
	.detect = eata2x_detect,
	.release = eata2x_release,
	.queuecommand = eata2x_queuecommand,
	.eh_abort_handler = eata2x_eh_abort,
	.eh_host_reset_handler = eata2x_eh_host_reset,
	.bios_param = eata2x_bios_param,
	.slave_configure = eata2x_slave_configure,
	.this_id = 7,
	.unchecked_isa_dma = 1,
	.use_clustering = ENABLE_CLUSTERING,
	.use_sg_chaining = ENABLE_SG_CHAINING,
};

#if !defined(__BIG_ENDIAN_BITFIELD) && !defined(__LITTLE_ENDIAN_BITFIELD)
#error "Adjust your <asm/byteorder.h> defines"
#endif

/* Subversion values */
#define ISA  0
#define ESA 1

#undef  FORCE_CONFIG

#undef  DEBUG_LINKED_COMMANDS
#undef  DEBUG_DETECT
#undef  DEBUG_PCI_DETECT
#undef  DEBUG_INTERRUPT
#undef  DEBUG_RESET
#undef  DEBUG_GENERATE_ERRORS
#undef  DEBUG_GENERATE_ABORTS
#undef  DEBUG_GEOMETRY

#define MAX_ISA 4
#define MAX_VESA 0
#define MAX_EISA 15
#define MAX_PCI 16
#define MAX_BOARDS (MAX_ISA + MAX_VESA + MAX_EISA + MAX_PCI)
#define MAX_CHANNEL 4
#define MAX_LUN 32
#define MAX_TARGET 32
#define MAX_MAILBOXES 64
#define MAX_SGLIST 64
#define MAX_LARGE_SGLIST 122
#define MAX_INTERNAL_RETRIES 64
#define MAX_CMD_PER_LUN 2
#define MAX_TAGGED_CMD_PER_LUN (MAX_MAILBOXES - MAX_CMD_PER_LUN)

#define SKIP ULONG_MAX
#define FREE 0
#define IN_USE   1
#define LOCKED   2
#define IN_RESET 3
#define IGNORE   4
#define READY    5
#define ABORTING 6
#define NO_DMA  0xff
#define MAXLOOP  10000
#define TAG_DISABLED 0
#define TAG_SIMPLE   1
#define TAG_ORDERED  2

#define REG_CMD         7
#define REG_STATUS      7
#define REG_AUX_STATUS  8
#define REG_DATA        0
#define REG_DATA2       1
#define REG_SEE         6
#define REG_LOW         2
#define REG_LM          3
#define REG_MID         4
#define REG_MSB         5
#define REGION_SIZE     9UL
#define MAX_ISA_ADDR    0x03ff
#define MIN_EISA_ADDR   0x1c88
#define MAX_EISA_ADDR   0xfc88
#define BSY_ASSERTED      0x80
#define DRQ_ASSERTED      0x08
#define ABSY_ASSERTED     0x01
#define IRQ_ASSERTED      0x02
#define READ_CONFIG_PIO   0xf0
#define SET_CONFIG_PIO    0xf1
#define SEND_CP_PIO       0xf2
#define RECEIVE_SP_PIO    0xf3
#define TRUNCATE_XFR_PIO  0xf4
#define RESET_PIO         0xf9
#define READ_CONFIG_DMA   0xfd
#define SET_CONFIG_DMA    0xfe
#define SEND_CP_DMA       0xff
#define ASOK              0x00
#define ASST              0x01

#define YESNO(a) ((a) ? 'y' : 'n')
#define TLDEV(type) ((type) == TYPE_DISK || (type) == TYPE_ROM)

/* "EATA", in Big Endian format */
#define EATA_SIG_BE 0x45415441

/* Number of valid bytes in the board config structure for EATA 2.0x */
#define EATA_2_0A_SIZE 28
#define EATA_2_0B_SIZE 30
#define EATA_2_0C_SIZE 34

/* Board info structure */
struct eata_info {
	u_int32_t data_len;	/* Number of valid bytes after this field */
	u_int32_t sign;		/* ASCII "EATA" signature */

#if defined(__BIG_ENDIAN_BITFIELD)
	unchar version	: 4,
	       		: 4;
	unchar haaval	: 1,
	       ata	: 1,
	       drqvld	: 1,
	       dmasup	: 1,
	       morsup	: 1,
	       trnxfr	: 1,
	       tarsup	: 1,
	       ocsena	: 1;
#else
	unchar		: 4,	/* unused low nibble */
	 	version	: 4;	/* EATA version, should be 0x1 */
	unchar ocsena	: 1,	/* Overlap Command Support Enabled */
	       tarsup	: 1,	/* Target Mode Supported */
	       trnxfr	: 1,	/* Truncate Transfer Cmd NOT Necessary */
	       morsup	: 1,	/* More Supported */
	       dmasup	: 1,	/* DMA Supported */
	       drqvld	: 1,	/* DRQ Index (DRQX) is valid */
	       ata	: 1,	/* This is an ATA device */
	       haaval	: 1;	/* Host Adapter Address Valid */
#endif

	ushort cp_pad_len;	/* Number of pad bytes after cp_len */
	unchar host_addr[4];	/* Host Adapter SCSI ID for channels 3, 2, 1, 0 */
	u_int32_t cp_len;	/* Number of valid bytes in cp */
	u_int32_t sp_len;	/* Number of valid bytes in sp */
	ushort queue_size;	/* Max number of cp that can be queued */
	ushort unused;
	ushort scatt_size;	/* Max number of entries in scatter/gather table */

#if defined(__BIG_ENDIAN_BITFIELD)
	unchar drqx	: 2,
	       second	: 1,
	       irq_tr	: 1,
	       irq	: 4;
	unchar sync;
	unchar		: 4,
	       res1	: 1,
	       large_sg	: 1,
	       forcaddr	: 1,
	       isaena	: 1;
	unchar max_chan	: 3,
	       max_id	: 5;
	unchar max_lun;
	unchar eisa	: 1,
	       pci	: 1,
	       idquest	: 1,
	       m1	: 1,
	       		: 4;
#else
	unchar irq	: 4,	/* Interrupt Request assigned to this controller */
	       irq_tr	: 1,	/* 0 for edge triggered, 1 for level triggered */
	       second	: 1,	/* 1 if this is a secondary (not primary) controller */
	       drqx	: 2;	/* DRQ Index (0=DMA0, 1=DMA7, 2=DMA6, 3=DMA5) */
	unchar sync;		/* 1 if scsi target id 7...0 is running sync scsi */

	/* Structure extension defined in EATA 2.0B */
	unchar isaena	: 1,	/* ISA i/o addressing is disabled/enabled */
	       forcaddr	: 1,	/* Port address has been forced */
	       large_sg	: 1,	/* 1 if large SG lists are supported */
	       res1	: 1,
	       		: 4;
	unchar max_id	: 5,	/* Max SCSI target ID number */
	       max_chan	: 3;	/* Max SCSI channel number on this board */

	/* Structure extension defined in EATA 2.0C */
	unchar max_lun;		/* Max SCSI LUN number */
	unchar
			: 4,
	       m1	: 1,	/* This is a PCI with an M1 chip installed */
	       idquest	: 1,	/* RAIDNUM returned is questionable */
	       pci	: 1,	/* This board is PCI */
	       eisa	: 1;	/* This board is EISA */
#endif

	unchar raidnum;		/* Uniquely identifies this HBA in a system */
	unchar notused;

	ushort ipad[247];
};

/* Board config structure */
struct eata_config {
	ushort len;		/* Number of bytes following this field */

#if defined(__BIG_ENDIAN_BITFIELD)
	unchar		: 4,
	       tarena	: 1,
	       mdpena	: 1,
	       ocena	: 1,
	       edis	: 1;
#else
	unchar edis	: 1,	/* Disable EATA interface after config command */
	       ocena	: 1,	/* Overlapped Commands Enabled */
	       mdpena	: 1,	/* Transfer all Modified Data Pointer Messages */
	       tarena	: 1,	/* Target Mode Enabled for this controller */
	       		: 4;
#endif
	unchar cpad[511];
};

/* Returned status packet structure */
struct mssp {
#if defined(__BIG_ENDIAN_BITFIELD)
	unchar eoc	: 1,
	       adapter_status : 7;
#else
	unchar adapter_status : 7,	/* State related to current command */
	       eoc	: 1;		/* End Of Command (1 = command completed) */
#endif
	unchar target_status;	/* SCSI status received after data transfer */
	unchar unused[2];
	u_int32_t inv_res_len;	/* Number of bytes not transferred */
	u_int32_t cpp_index;	/* Index of address set in cp */
	char mess[12];
};

struct sg_list {
	unsigned int address;	/* Segment Address */
	unsigned int num_bytes;	/* Segment Length */
};

/* MailBox SCSI Command Packet */
struct mscp {
#if defined(__BIG_ENDIAN_BITFIELD)
	unchar din	: 1,
	       dout	: 1,
	       interp	: 1,
	       		: 1,
		sg	: 1,
		reqsen	:1,
		init	: 1,
		sreset	: 1;
	unchar sense_len;
	unchar unused[3];
	unchar		: 7,
	       fwnest	: 1;
	unchar		: 5,
	       hbaci	: 1,
	       iat	: 1,
	       phsunit	: 1;
	unchar channel	: 3,
	       target	: 5;
	unchar one	: 1,
	       dispri	: 1,
	       luntar	: 1,
	       lun	: 5;
#else
	unchar sreset	:1,	/* SCSI Bus Reset Signal should be asserted */
	       init	:1,	/* Re-initialize controller and self test */
	       reqsen	:1,	/* Transfer Request Sense Data to addr using DMA */
	       sg	:1,	/* Use Scatter/Gather */
	       		:1,
	       interp	:1,	/* The controller interprets cp, not the target */
	       dout	:1,	/* Direction of Transfer is Out (Host to Target) */
	       din	:1;	/* Direction of Transfer is In (Target to Host) */
	unchar sense_len;	/* Request Sense Length */
	unchar unused[3];
	unchar fwnest	: 1,	/* Send command to a component of an Array Group */
			: 7;
	unchar phsunit	: 1,	/* Send to Target Physical Unit (bypass RAID) */
	       iat	: 1,	/* Inhibit Address Translation */
	       hbaci	: 1,	/* Inhibit HBA Caching for this command */
	       		: 5;
	unchar target	: 5,	/* SCSI target ID */
	       channel	: 3;	/* SCSI channel number */
	unchar lun	: 5,	/* SCSI logical unit number */
	       luntar	: 1,	/* This cp is for Target (not LUN) */
	       dispri	: 1,	/* Disconnect Privilege granted */
	       one	: 1;	/* 1 */
#endif

	unchar mess[3];		/* Massage to/from Target */
	unchar cdb[12];		/* Command Descriptor Block */
	u_int32_t data_len;	/* If sg=0 Data Length, if sg=1 sglist length */
	u_int32_t cpp_index;	/* Index of address to be returned in sp */
	u_int32_t data_address;	/* If sg=0 Data Address, if sg=1 sglist address */
	u_int32_t sp_dma_addr;	/* Address where sp is DMA'ed when cp completes */
	u_int32_t sense_addr;	/* Address where Sense Data is DMA'ed on error */

	/* Additional fields begin here. */
	struct scsi_cmnd *SCpnt;

	/* All the cp structure is zero filled by queuecommand except the
	   following CP_TAIL_SIZE bytes, initialized by detect */
	dma_addr_t cp_dma_addr;	/* dma handle for this cp structure */
	struct sg_list *sglist;	/* pointer to the allocated SG list */
};

#define CP_TAIL_SIZE (sizeof(struct sglist *) + sizeof(dma_addr_t))

struct hostdata {
	struct mscp cp[MAX_MAILBOXES];	/* Mailboxes for this board */
	unsigned int cp_stat[MAX_MAILBOXES];	/* FREE, IN_USE, LOCKED, IN_RESET */
	unsigned int last_cp_used;	/* Index of last mailbox used */
	unsigned int iocount;	/* Total i/o done for this board */
	int board_number;	/* Number of this board */
	char board_name[16];	/* Name of this board */
	int in_reset;		/* True if board is doing a reset */
	int target_to[MAX_TARGET][MAX_CHANNEL];	/* N. of timeout errors on target */
	int target_redo[MAX_TARGET][MAX_CHANNEL];	/* If 1 redo i/o on target */
	unsigned int retries;	/* Number of internal retries */
	unsigned long last_retried_pid;	/* Pid of last retried command */
	unsigned char subversion;	/* Bus type, either ISA or EISA/PCI */
	unsigned char protocol_rev;	/* EATA 2.0 rev., 'A' or 'B' or 'C' */