eata.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,842 行 · 第 1/5 页

 *  interrupts.
 *
 *  If you configure multiple boards on the same IRQ, the interrupt must
 *  be _level_ triggered (not _edge_ triggered).
 *
 *  This driver detects EATA boards by probes at fixed port addresses,
 *  so no BIOS32 or PCI BIOS support is required.
 *  The suggested way to detect a generic EATA PCI board is to force on it
 *  any unused EISA address, even if there are other controllers on the EISA
 *  bus, or even if you system has no EISA bus at all.
 *  Do not force any ISA address on EATA PCI boards.
 *
 *  If PCI bios support is configured into the kernel, BIOS32 is used to
 *  include in the list of i/o ports to be probed all the PCI SCSI controllers.
 *
 *  Due to a DPT BIOS "feature", it might not be possible to force an EISA
 *  address on more than a single DPT PCI board, so in this case you have to
 *  let the PCI BIOS assign the addresses.
 *
 *  The sequence of detection probes is:
 *
 *  - ISA 0x1F0;
 *  - PCI SCSI controllers (only if BIOS32 is available);
 *  - EISA/PCI 0x1C88 through 0xFC88 (corresponding to EISA slots 1 to 15);
 *  - ISA  0x170, 0x230, 0x330.
 *
 *  The above list of detection probes can be totally replaced by the
 *  boot command line option: "eata=port0,port1,port2,...", where the
 *  port0, port1... arguments are ISA/EISA/PCI addresses to be probed.
 *  For example using "eata=0x7410,0x7450,0x230", the driver probes
 *  only the two PCI addresses 0x7410 and 0x7450 and the ISA address 0x230,
 *  in this order; "eata=0" totally disables this driver.
 *
 *  After the optional list of detection probes, other possible command line
 *  options are:
 *
 *  et:y  force use of extended translation (255 heads, 63 sectors);
 *  et:n  use disk geometry detected by scsicam_bios_param;
 *  rs:y  reverse scan order while detecting PCI boards;
 *  rs:n  use BIOS order while detecting PCI boards;
 *  lc:y  enables linked commands;
 *  lc:n  disables linked commands;
 *  tm:0  disables tagged commands (same as tc:n);
 *  tm:1  use simple queue tags (same as tc:y);
 *  tm:2  use ordered queue tags (same as tc:2);
 *  mq:xx set the max queue depth to the value xx (2 <= xx <= 32).
 *
 *  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 = TRUE for all ISA boards.
 */

#include <linux/config.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/byteorder.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 <scsi/scsicam.h>
#include "scsi.h"
#include <scsi/scsi_host.h>
#include <asm/dma.h>
#include <asm/irq.h>

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

static 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_device_reset_handler = NULL,
                .eh_bus_reset_handler    = NULL,
                .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
                };
#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 FALSE 0
#define TRUE 1
#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 */