u14-34f.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,874 行 · 第 1/5 页

 *  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 boards are named Ux4F0, Ux4F1,... 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 u14_34f_detect(Scsi_Host_Template *);
static int u14_34f_release(struct Scsi_Host *);
static int u14_34f_queuecommand(Scsi_Cmnd *, void (*done)(Scsi_Cmnd *));
static int u14_34f_eh_abort(Scsi_Cmnd *);
static int u14_34f_eh_host_reset(Scsi_Cmnd *);
static int u14_34f_bios_param(struct scsi_device *, struct block_device *,
                              sector_t, int *);
static int u14_34f_slave_configure(Scsi_Device *);

static Scsi_Host_Template driver_template = {
                .name                    = "UltraStor 14F/34F rev. 8.10.00 ",
                .detect                  = u14_34f_detect,
                .release                 = u14_34f_release,
                .queuecommand            = u14_34f_queuecommand,
                .eh_abort_handler        = u14_34f_eh_abort,
                .eh_device_reset_handler = NULL,
                .eh_bus_reset_handler    = NULL,
                .eh_host_reset_handler   = u14_34f_eh_host_reset,
                .bios_param              = u14_34f_bios_param,
                .slave_configure         = u14_34f_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

/* Values for the PRODUCT_ID ports for the 14/34F */
#define PRODUCT_ID1  0x56
#define PRODUCT_ID2  0x40        /* NOTE: Only upper nibble is used */

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

#define OP_HOST_ADAPTER   0x1
#define OP_SCSI           0x2
#define OP_RESET          0x4
#define DTD_SCSI          0x0
#define DTD_IN            0x1
#define DTD_OUT           0x2
#define DTD_NONE          0x3
#define HA_CMD_INQUIRY    0x1
#define HA_CMD_SELF_DIAG  0x2
#define HA_CMD_READ_BUFF  0x3
#define HA_CMD_WRITE_BUFF 0x4

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

#define MAX_ISA 3
#define MAX_VESA 1
#define MAX_EISA 0
#define MAX_PCI 0
#define MAX_BOARDS (MAX_ISA + MAX_VESA + MAX_EISA + MAX_PCI)
#define MAX_CHANNEL 1
#define MAX_LUN 8
#define MAX_TARGET 8
#define MAX_MAILBOXES 16
#define MAX_SGLIST 32
#define MAX_SAFE_SGLIST 16
#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_LCL_MASK      0
#define REG_LCL_INTR      1
#define REG_SYS_MASK      2
#define REG_SYS_INTR      3
#define REG_PRODUCT_ID1   4
#define REG_PRODUCT_ID2   5
#define REG_CONFIG1       6
#define REG_CONFIG2       7
#define REG_OGM           8
#define REG_ICM           12
#define REGION_SIZE       13UL
#define BSY_ASSERTED      0x01
#define IRQ_ASSERTED      0x01
#define CMD_RESET         0xc0
#define CMD_OGM_INTR      0x01
#define CMD_CLR_INTR      0x01
#define CMD_ENA_INTR      0x81
#define ASOK              0x00
#define ASST              0x91

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

#define PACKED          __attribute__((packed))

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)
   unsigned char sg:1, ca:1, dcn:1, xdir:2, opcode:3;
   unsigned char lun: 3, channel:2, target:3;
#else
   unsigned char opcode: 3,             /* type of command */
                 xdir: 2,               /* data transfer direction */
                 dcn: 1,                /* disable disconnect */
                 ca: 1,                 /* use cache (if available) */
                 sg: 1;                 /* scatter/gather operation */
   unsigned char target: 3,             /* SCSI target id */
                 channel: 2,            /* SCSI channel number */
                 lun: 3;                /* SCSI logical unit number */
#endif

   unsigned int data_address PACKED;    /* transfer data pointer */
   unsigned int data_len PACKED;        /* length in bytes */
   unsigned int link_address PACKED;    /* for linking command chains */
   unsigned char clink_id;              /* identifies command in chain */
   unsigned char use_sg;                /* (if sg is set) 8 bytes per list */
   unsigned char sense_len;
   unsigned char cdb_len;               /* 6, 10, or 12 */
   unsigned char cdb[12];               /* SCSI Command Descriptor Block */
   unsigned char adapter_status;        /* non-zero indicates HA error */
   unsigned char target_status;         /* non-zero indicates target error */
   unsigned int sense_addr PACKED;

   /* Additional fields begin here. */
   Scsi_Cmnd *SCpnt;
   unsigned int cpp_index;              /* cp index */

   /* 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 TRUE 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 ESA */
   struct pci_dev *pdev;                /* Always NULL */
   unsigned char heads;
   unsigned char sectors;
   char board_id[256];                  /* data from INQUIRY on this board */
   };

static struct Scsi_Host *sh[MAX_BOARDS + 1];
static const char *driver_name = "Ux4F";
static char sha[MAX_BOARDS];
static spinlock_t driver_lock = SPIN_LOCK_UNLOCKED;

/* Initialize num_boards so that ihdlr can work while detect is in progress */
static unsigned int num_boards = MAX_BOARDS;

static unsigned long io_port[] = {

   /* Space for MAX_INT_PARAM ports usable while loading as a module */
   SKIP,    SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,   SKIP,
   SKIP,    SKIP,

   /* Possible ISA/VESA ports */
   0x330, 0x340, 0x230, 0x240, 0x210, 0x130, 0x140,

   /* End of list */
   0x0
   };

#define HD(board) ((struct hostdata *) &sh[board]->hostdata)
#define BN(board) (HD(board)->board_name)

/* Device is Little Endian */
#define H2DEV(x) cpu_to_le32(x)
#define DEV2H(x) le32_to_cpu(x)

static irqreturn_t do_interrupt_handler(int, void *, struct pt_regs *);
static void flush_dev(Scsi_Device *, unsigned long, unsigned int, unsigned int);
static int do_trace = FALSE;
static int setup_done = FALSE;
static int link_statistics;
static int ext_tran = FALSE;

#if defined(HAVE_OLD_UX4F_FIRMWARE)
static int have_old_firmware = TRUE;
#else
static int have_old_firmware = FALSE;
#endif

#if defined(CONFIG_SCSI_U14_34F_TAGGED_QUEUE)
static int tag_mode = TAG_SIMPLE;
#else
static int tag_mode = TAG_DISABLED;
#endif

#if defined(CONFIG_SCSI_U14_34F_LINKED_COMMANDS)
static int linked_comm = TRUE;
#else
static int linked_comm = FALSE;
#endif

#if defined(CONFIG_SCSI_U14_34F_MAX_TAGS)
static int max_queue_depth = CONFIG_SCSI_U14_34F_MAX_TAGS;
#else
static int max_queue_depth = MAX_CMD_PER_LUN;
#endif

#define MAX_INT_PARAM 10
#define MAX_BOOT_OPTIONS_SIZE 256
static char boot_options[MAX_BOOT_OPTIONS_SIZE];

#if defined(MODULE)
#include <linux/module.h>
#include <linux/moduleparam.h>

module_param_string(u14_34f, boot_options, MAX_BOOT_OPTIONS_SIZE, 0);
MODULE_PARM_DESC(u14_34f, " equivalent to the \"u14-34f=...\" kernel boot " \
"option." \
"      Example: modprobe u14-34f \"u14_34f=0x340,0x330,lc:y,tm:0,mq:4\"");
MODULE_AUTHOR("Dario Ballabio");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("UltraStor 14F/34F SCSI Driver");

#endif

static int u14_34f_slave_configure(Scsi_Device *dev) {
   int j, tqd, utqd;
   char *tag_suffix, *link_suffix;
   struct Scsi_Host *host = dev->host;

   j = ((struct hostdata *) host->hostdata)->board_number;

   utqd = MAX_CMD_PER_LUN;
   tqd = max_queue_depth;

   if (TLDEV(dev->type) && dev->tagged_supported)

      if (tag_mode == TAG_SIMPLE) {
         scsi_adjust_queue_depth(dev, MSG_SIMPLE_TAG, tqd);
         tag_suffix = ", simple tags";
         }
      else if (tag_mode == TAG_ORDERED) {
         scsi_adjust_queue_depth(dev, MSG_ORDERED_TAG, tqd);
         tag_suffix = ", ordered tags";
         }
      else {
         scsi_adjust_queue_depth(dev, 0, tqd);
         tag_suffix = ", no tags";
         }

   else if (TLDEV(dev->type) && linked_comm) {
      scsi_adjust_queue_depth(dev, 0, tqd);
      tag_suffix = ", untagged";
      }

   else {
      scsi_adjust_queue_depth(dev, 0, utqd);
      tag_suffix = "";
      }

   if (TLDEV(dev->type) && linked_comm && dev->queue_depth > 2)
      link_suffix = ", sorted";
   else if (TLDEV(dev->type))
      link_suffix = ", unsorted";
   else
      link_suffix = "";

   printk("%s: scsi%d, channel %d, id %d, lun %d, cmds/lun %d%s%s.\n",
          BN(j), host->host_no, dev->channel, dev->id, dev->lun,
          dev->queue_depth, link_suffix, tag_suffix);

   return FALSE;
}

static int wait_on_busy(unsigned long iobase, unsigned int loop) {

   while (inb(iobase + REG_LCL_INTR) & BSY_ASSERTED) {
      udelay(1L);
      if (--loop == 0) return TRUE;
      }

   return FALSE;
}

static int board_inquiry(unsigned int j) {
   struct mscp *cpp;
   dma_addr_t id_dma_addr;
   unsigned int time, limit = 0;

   id_dma_addr = pci_map_single(HD(j)->pdev, HD(j)->board_id,
                    sizeof(HD(j)->board_id), PCI_DMA_BIDIRECTIONAL);