u14-34f.c

GNU Mach 微内核源代码, 基于美国卡内基美隆大学的 Mach 研究项目

#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 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       13
#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 ARRAY_SIZE(arr) (sizeof (arr) / sizeof (arr)[0])
#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 {
   unsigned char opcode: 3;             /* type of command */
   unsigned char xdir: 2;               /* data transfer direction */
   unsigned char dcn: 1;                /* disable disconnect */
   unsigned char ca: 1;                 /* use cache (if available) */
   unsigned char sg: 1;                 /* scatter/gather operation */
   unsigned char target: 3;             /* SCSI target id */
   unsigned char channel: 2;            /* SCSI channel number */
   unsigned char lun: 3;                /* SCSI logical unit number */
   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 scsi_cdbs_len;         /* 6, 10, or 12 */
   unsigned char scsi_cdbs[12];         /* SCSI commands */
   unsigned char adapter_status;        /* non-zero indicates HA error */
   unsigned char target_status;         /* non-zero indicates target error */
   unsigned int sense_addr PACKED;
   Scsi_Cmnd *SCpnt;
   unsigned int index;                  /* cp index */
   struct sg_list *sglist;
   };

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 */
   char board_id[256];                  /* data from INQUIRY on 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 */
   unsigned char heads;
   unsigned char sectors;

   /* slot != 0 for the U24F, slot == 0 for both the U14F and U34F */
   unsigned char slot;
   };

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

/* 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[] __initdata = {

   /* 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)

#define SWAP_BYTE(x) ((unsigned long)( \
        (((unsigned long)(x) & 0x000000ffU) << 24) | \
        (((unsigned long)(x) & 0x0000ff00U) <<  8) | \
        (((unsigned long)(x) & 0x00ff0000U) >>  8) | \
        (((unsigned long)(x) & 0xff000000U) >> 24)))

#if defined(__BIG_ENDIAN)
#define H2DEV(x) SWAP_BYTE(x)
#else
#define H2DEV(x) (x)
#endif

#define DEV2H(x) H2DEV(x)
#define V2DEV(addr) ((addr) ? H2DEV(virt_to_bus((void *)addr)) : 0)
#define DEV2V(addr) ((addr) ? DEV2H(bus_to_virt((unsigned long)addr)) : 0)

static void 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 = 0;
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_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

static void select_queue_depths(struct Scsi_Host *host, Scsi_Device *devlist) {
   Scsi_Device *dev;
   int j, ntag = 0, nuntag = 0, tqd, utqd;
   IRQ_FLAGS

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

   for(dev = devlist; dev; dev = dev->next) {

      if (dev->host != host) continue;

      if (TLDEV(dev->type) && (dev->tagged_supported || linked_comm))
         ntag++;
      else
         nuntag++;
      }

   utqd = MAX_CMD_PER_LUN;

   tqd = (host->can_queue - utqd * nuntag) / (ntag ? ntag : 1);

   if (tqd > max_queue_depth) tqd = max_queue_depth;

   if (tqd < MAX_CMD_PER_LUN) tqd = MAX_CMD_PER_LUN;

   for(dev = devlist; dev; dev = dev->next) {
      char *tag_suffix = "", *link_suffix = "";

      if (dev->host != host) continue;

      if (TLDEV(dev->type) && (dev->tagged_supported || linked_comm))
         dev->queue_depth = tqd;
      else
         dev->queue_depth = utqd;

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

      if (dev->tagged_supported && TLDEV(dev->type) && dev->tagged_queue)
         tag_suffix = ", tagged";
      else if (dev->tagged_supported && TLDEV(dev->type))
         tag_suffix = ", untagged";

      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);
      }

   IRQ_UNLOCK_RESTORE
   return;
}

static inline 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;
   unsigned int time, limit = 0;

   cpp = &HD(j)->cp[0];
   memset(cpp, 0, sizeof(struct mscp));
   cpp->opcode = OP_HOST_ADAPTER;
   cpp->xdir = DTD_IN;
   cpp->data_address = V2DEV(HD(j)->board_id);
   cpp->data_len = H2DEV(sizeof(HD(j)->board_id));
   cpp->scsi_cdbs_len = 6;
   cpp->scsi_cdbs[0] = HA_CMD_INQUIRY;

   if (wait_on_busy(sh[j]->io_port, MAXLOOP)) {
      printk("%s: board_inquiry, adapter busy.\n", BN(j));
      return TRUE;
      }

   HD(j)->cp_stat[0] = IGNORE;

   /* Clear the interrupt indication */
   outb(CMD_CLR_INTR, sh[j]->io_port + REG_SYS_INTR);

   /* Store pointer in OGM address bytes */
   outl(V2DEV(cpp), sh[j]->io_port + REG_OGM);

   /* Issue OGM interrupt */
   outb(CMD_OGM_INTR, sh[j]->io_port + REG_LCL_INTR);

   SPIN_UNLOCK
   IRQ_UNLOCK
   time = jiffies;
   while ((jiffies - time) < HZ && limit++ < 20000) udelay(100L);
   IRQ_LOCK
   SPIN_LOCK

   if (cpp->adapter_status || HD(j)->cp_stat[0] != FREE) {
      HD(j)->cp_stat[0] = FREE;
      printk("%s: board_inquiry, err 0x%x.\n", BN(j), cpp->adapter_status);
      return TRUE;
      }

   return FALSE;
}

__initfunc (static inline int port_detect \
      (unsigned long port_base, unsigned int j, Scsi_Host_Template *tpnt)) {
   unsigned char irq, dma_channel, subversion, i;
   unsigned char in_byte;
   char *bus_type, dma_name[16];

   /* Allowed BIOS base addresses (NULL indicates reserved) */
   void *bios_segment_table[8] = {
      NULL,
      (void *) 0xc4000, (void *) 0xc8000, (void *) 0xcc000, (void *) 0xd0000,
      (void *) 0xd4000, (void *) 0xd8000, (void *) 0xdc000
      };

   /* Allowed IRQs */
   unsigned char interrupt_table[4] = { 15, 14, 11, 10 };

   /* Allowed DMA channels for ISA (0 indicates reserved) */
   unsigned char dma_channel_table[4] = { 5, 6, 7, 0 };

   /* Head/sector mappings */
   struct {
      unsigned char heads;
      unsigned char sectors;
      } mapping_table[4] = {
           { 16, 63 }, { 64, 32 }, { 64, 63 }, { 64, 32 }
           };

   struct config_1 {
      unsigned char bios_segment: 3;
      unsigned char removable_disks_as_fixed: 1;
      unsigned char interrupt: 2;
      unsigned char dma_channel: 2;
      } config_1;

   struct config_2 {
      unsigned char ha_scsi_id: 3;
      unsigned char mapping_mode: 2;
      unsigned char bios_drive_number: 1;
      unsigned char tfr_port: 2;
      } config_2;

   char name[16];

   sprintf(name, "%s%d", driver_name, j);

   if(check_region(port_base, REGION_SIZE)) {
      printk("%s: address 0x%03lx in use, skipping probe.\n", name, port_base);
      return FALSE;
      }

   if (inb(port_base + REG_PRODUCT_ID1) != PRODUCT_ID1) return FALSE;

   in_byte = inb(port_base + REG_PRODUCT_ID2);

   if ((in_byte & 0xf0) != PRODUCT_ID2) return FALSE;

   *(char *)&config_1 = inb(port_base + REG_CONFIG1);
   *(char *)&config_2 = inb(port_base + REG_CONFIG2);

   irq = interrupt_table[config_1.interrupt];
   dma_channel = dma_channel_table[config_1.dma_channel];
   subversion = (in_byte & 0x0f);

   /* Board detected, allocate its IRQ */
   if (request_irq(irq, do_interrupt_handler,
             SA_INTERRUPT | ((subversion == ESA) ? SA_SHIRQ : 0),
             driver_name, (void *) &sha[j])) {
      printk("%s: unable to allocate IRQ %u, detaching.\n", name, irq);
      return FALSE;
      }

   if (subversion == ISA && request_dma(dma_channel, driver_name)) {
      printk("%s: unable to allocate DMA channel %u, detaching.\n",
             name, dma_channel);
      free_irq(irq, &sha[j]);
      return FALSE;
      }

   if (have_old_firmware) tpnt->use_clustering = DISABLE_CLUSTERING;

#if LINUX_VERSION_CODE >= LinuxVersionCode(2,1,101)
   tpnt->use_new_eh_code = use_new_eh_code;
#else
   use_new_eh_code = FALSE;
#endif

   sh[j] = scsi_register(tpnt, sizeof(struct hostdata));