fas216.c

arm平台上的uclinux系统全部源代码

			SCpnt->result = DID_ERROR << 16;
			done(SCpnt);
		}
		save_flags_cli(flags);
		if (!info->SCpnt || info->scsi.disconnectable)
			fas216_kick(info);
		restore_flags(flags);
	} else {
		/* no interrupts to rely on - we'll have to handle the
		 * command ourselves.  For now, we give up.
		 */
		SCpnt->result = DID_ERROR << 16;
		done(SCpnt);
	}
	return 0;
}

/* Function: void fas216_internal_done(Scsi_Cmnd *SCpnt)
 * Purpose : trigger restart of a waiting thread in fas216_command
 * Params  : SCpnt - Command to wake
 */
static void fas216_internal_done(Scsi_Cmnd *SCpnt)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;

	fas216_checkmagic(info, "fas216_internal_done");

	info->internal_done = 1;
}

/* Function: int fas216_command(Scsi_Cmnd *SCpnt)
 * Purpose : queue a command for adapter to process.
 * Params  : SCpnt - Command to queue
 * Returns : scsi result code
 */
int fas216_command(Scsi_Cmnd *SCpnt)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
	unsigned long flags;

	fas216_checkmagic(info, "fas216_command");

	info->internal_done = 0;
	fas216_queue_command(SCpnt, fas216_internal_done);

	/*
	 * This wastes time, since we can't return until the command is
	 * complete. We can't seep either since we may get re-entered!
	 * However, we must re-enable interrupts, or else we'll be
	 * waiting forever.
	 */
	save_flags(flags);
	sti();

	while (!info->internal_done)
		barrier();

	restore_flags(flags);

	return SCpnt->result;
}

/* Prototype: void fas216_reportstatus(Scsi_Cmnd **SCpntp1,
 *				       Scsi_Cmnd **SCpntp2, int result)
 * Purpose  : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2
 * Params   : SCpntp1 - pointer to command to return
 *	      SCpntp2 - pointer to command to check
 *	      result  - result to pass back to mid-level done function
 * Returns  : *SCpntp2 = NULL if *SCpntp1 is the same command
 *	      structure as *SCpntp2.
 */
static void fas216_reportstatus(Scsi_Cmnd **SCpntp1, Scsi_Cmnd **SCpntp2,
				int result)
{
	Scsi_Cmnd *SCpnt = *SCpntp1;

	if (SCpnt) {
		*SCpntp1 = NULL;

		SCpnt->result = result;
		SCpnt->scsi_done(SCpnt);
	}

	if (SCpnt == *SCpntp2)
		*SCpntp2 = NULL;
}

/* Function: int fas216_abort(Scsi_Cmnd *SCpnt)
 * Purpose : abort a command if something horrible happens.
 * Params  : SCpnt - Command that is believed to be causing a problem.
 * Returns : one of SCSI_ABORT_ macros.
 */
int fas216_abort(Scsi_Cmnd *SCpnt)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
	int result = SCSI_ABORT_SNOOZE;

	fas216_checkmagic(info, "fas216_abort");

	info->stats.aborts += 1;

	print_debug_list();
	fas216_dumpstate(info);
	fas216_dumpinfo(info);
	printk(KERN_WARNING "scsi%d: fas216_abort: ", info->host->host_no);

	do {
		/* If command is waiting in the issue queue, then we can
		 * simply remove the command and return abort status
		 */
		if (queue_removecmd(&info->queues.issue, SCpnt)) {
			SCpnt->result = DID_ABORT << 16;
			SCpnt->scsi_done(SCpnt);
			printk("command on issue queue");
			result = SCSI_ABORT_SUCCESS;
			break;
		}

		/* If the command is on the disconencted queue, we need to
		 * reconnect to the device
		 */
		if (queue_cmdonqueue(&info->queues.disconnected, SCpnt))
			printk("command on disconnected queue");

		/* If the command is connected, we need to flag that the
		 * command needs to be aborted
		 */
		if (info->SCpnt == SCpnt)
			printk("command executing");

		/* If the command is pending for execution, then again
		 * this is simple - we remove it and report abort status
		 */
		if (info->origSCpnt == SCpnt) {
			info->origSCpnt = NULL;
			SCpnt->result = DID_ABORT << 16;
			SCpnt->scsi_done(SCpnt);
			printk("command waiting for execution");
			result = SCSI_ABORT_SUCCESS;
			break;
		}
	} while (0);

	printk("\n");

	return result;
}

/* Function: void fas216_reset_state(FAS216_Info *info)
 * Purpose : Initialise driver internal state
 * Params  : info - state to initialise
 */
static void fas216_reset_state(FAS216_Info *info)
{
	neg_t sync_state, wide_state;
	int i;

	fas216_checkmagic(info, "fas216_reset_state");

	/*
	 * Clear out all stale info in our state structure
	 */
	memset(info->busyluns, 0, sizeof(info->busyluns));
	msgqueue_flush(&info->scsi.msgs);
	info->scsi.reconnected.target = 0;
	info->scsi.reconnected.lun = 0;
	info->scsi.reconnected.tag = 0;
	info->scsi.disconnectable = 0;
	info->scsi.aborting = 0;
	info->scsi.phase = PHASE_IDLE;
	info->scsi.async_stp =
			fas216_syncperiod(info, info->ifcfg.asyncperiod);

	if (info->ifcfg.wide_max_size == 0)
		wide_state = neg_invalid;
	else
#ifdef SCSI2_WIDE
		wide_state = neg_wait;
#else
		wide_state = neg_invalid;
#endif

	if (info->host->dma_channel == NO_DMA || !info->dma.setup)
		sync_state = neg_invalid;
	else
#ifdef SCSI2_SYNC
		sync_state = neg_wait;
#else
		sync_state = neg_invalid;
#endif

	for (i = 0; i < 8; i++) {
		info->device[i].disconnect_ok	= info->ifcfg.disconnect_ok;
		info->device[i].sync_state	= sync_state;
		info->device[i].wide_state	= wide_state;
		info->device[i].period		= info->ifcfg.asyncperiod / 4;
		info->device[i].stp		= info->scsi.async_stp;
		info->device[i].sof		= 0;
		info->device[i].wide_xfer	= 0;
	}
}

/* Function: void fas216_init_chip(FAS216_Info *info)
 * Purpose : Initialise FAS216 state after reset
 * Params  : info - state structure for interface
 */
static void fas216_init_chip(FAS216_Info *info)
{
	fas216_checkmagic(info, "fas216_init_chip");

	outb(fas216_clockrate(info->ifcfg.clockrate), REG_CLKF(info));
	outb(info->scsi.cfg[0], REG_CNTL1(info));
	outb(info->scsi.cfg[1], REG_CNTL2(info));
	outb(info->scsi.cfg[2], REG_CNTL3(info));
	outb(info->ifcfg.select_timeout, REG_STIM(info));
	outb(0, REG_SOF(info));
	outb(info->scsi.async_stp, REG_STP(info));
	outb(info->scsi.cfg[0], REG_CNTL1(info));
}

/* Function: int fas216_reset(Scsi_Cmnd *SCpnt, unsigned int reset_flags)
 * Purpose : resets the adapter if something horrible happens.
 * Params  : SCpnt - Command that is believed to be causing a problem.
 *	     reset_flags - flags indicating reset type that is believed
 *           to be required.
 * Returns : one of SCSI_RESET_ macros, or'd with the SCSI_RESET_*_RESET
 *           macros.
 */
int fas216_reset(Scsi_Cmnd *SCpnt, unsigned int reset_flags)
{
	FAS216_Info *info = (FAS216_Info *)SCpnt->host->hostdata;
	Scsi_Cmnd *SCptr;
	int result = 0;

	fas216_checkmagic(info, "fas216_reset");

	/*
	 * Validate that command is actually on one of our queues if we're doing
	 * an asynchronous reset
	 */
	if (reset_flags & SCSI_RESET_ASYNCHRONOUS &&
	    SCpnt &&
	    info->SCpnt != SCpnt &&
	    info->origSCpnt != SCpnt &&
	    !queue_cmdonqueue(&info->queues.disconnected, SCpnt) &&
	    !queue_cmdonqueue(&info->queues.issue, SCpnt)) {
		printk("scsi%d: fas216_reset: asynchronous reset for unknown command\n",
		       info->host->host_no);
		return SCSI_RESET_NOT_RUNNING;
	}

	info->stats.resets += 1;

	print_debug_list();
	printk(KERN_WARNING "scsi%d: fas216_reset: ", info->host->host_no);
	if (SCpnt)
		printk(" for target %d ", SCpnt->target);

	outb(info->scsi.cfg[3], REG_CNTL3(info));

	fas216_stoptransfer(info);

	switch (reset_flags & (SCSI_RESET_SUGGEST_BUS_RESET | SCSI_RESET_SUGGEST_HOST_RESET)) {
	case SCSI_RESET_SUGGEST_BUS_RESET:
		outb(CMD_RESETSCSI, REG_CMD(info));
		outb(CMD_NOP, REG_CMD(info));
		result |= SCSI_RESET_BUS_RESET;
		break;

	case SCSI_RESET_SUGGEST_HOST_RESET:
		outb(CMD_RESETCHIP, REG_CMD(info));
		outb(CMD_NOP, REG_CMD(info));
		result |= SCSI_RESET_HOST_RESET;
		break;

	default:
		outb(CMD_RESETCHIP, REG_CMD(info));
		outb(CMD_NOP, REG_CMD(info));
		outb(CMD_RESETSCSI, REG_CMD(info));
		result |= SCSI_RESET_HOST_RESET | SCSI_RESET_BUS_RESET;
		break;
	}

	udelay(300);
	fas216_reset_state(info);
	fas216_init_chip(info);

	/*
	 * Signal all commands in progress have been reset
	 */
	fas216_reportstatus(&info->SCpnt, &SCpnt, DID_RESET << 16);

	while ((SCptr = queue_remove(&info->queues.disconnected)) != NULL)
		fas216_reportstatus(&SCptr, &SCpnt, DID_RESET << 16);

	if (SCpnt) {
		/*
		 * Command not found on disconnected queue, nor currently
		 * executing command - check pending commands
		 */
		if (info->origSCpnt == SCpnt)
			info->origSCpnt = NULL;

		queue_removecmd(&info->queues.issue, SCpnt);

		SCpnt->result = DID_RESET << 16;
		SCpnt->scsi_done(SCpnt);
	}

	printk("\n");

	return result | SCSI_RESET_SUCCESS;
}

/* Function: int fas216_init(struct Scsi_Host *instance)
 * Purpose : initialise FAS/NCR/AMD SCSI ic.
 * Params  : instance - a driver-specific filled-out structure
 * Returns : 0 on success
 */
int fas216_init(struct Scsi_Host *instance)
{
	FAS216_Info *info = (FAS216_Info *)instance->hostdata;
	unsigned long flags;
	int target_jiffies;

	info->magic_start = MAGIC;
	info->magic_end = MAGIC;

	info->host = instance;
	info->scsi.cfg[0] = instance->this_id;
	info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE;
	info->scsi.cfg[2] = info->ifcfg.cntl3 | CNTL3_ADIDCHK | CNTL3_G2CB;
	info->scsi.type = "unknown";
	info->SCpnt = NULL;
	fas216_reset_state(info);

	memset(&info->stats, 0, sizeof(info->stats));

	msgqueue_initialise(&info->scsi.msgs);

	if (!queue_initialise(&info->queues.issue))
		return 1;

	if (!queue_initialise(&info->queues.disconnected)) {
		queue_free(&info->queues.issue);
		return 1;
	}

	outb(0, REG_CNTL3(info));
	outb(CNTL2_S2FE, REG_CNTL2(info));

	if ((inb(REG_CNTL2(info)) & (~0xe0)) != CNTL2_S2FE) {
		info->scsi.type = "NCR53C90";
	} else {
		outb(0, REG_CNTL2(info));
		outb(0, REG_CNTL3(info));
		outb(5, REG_CNTL3(info));
		if (inb(REG_CNTL3(info)) != 5) {
			info->scsi.type = "NCR53C90A";
		} else {
			outb(0, REG_CNTL3(info));
			info->scsi.type = "NCR53C9x";
		}
	}


	outb(CNTL3_ADIDCHK, REG_CNTL3(info));
	outb(0, REG_CNTL3(info));

	outb(CMD_RESETCHIP, REG_CMD(info));
	outb(CMD_WITHDMA | CMD_NOP, REG_CMD(info));
	outb(CNTL2_ENF, REG_CNTL2(info));
	outb(CMD_RESETCHIP, REG_CMD(info));
	switch (inb(REG1_ID(info))) {
	case 12:
		info->scsi.type = "Am53CF94";
		break;
	default:
		break;
	}

	udelay(300);
	/* now for the real initialisation */
	fas216_init_chip(info);

	outb(info->scsi.cfg[0] | CNTL1_DISR, REG_CNTL1(info));
	outb(CMD_RESETSCSI, REG_CMD(info));

	/* scsi standard says 250ms */
	target_jiffies = jiffies + (25 * HZ) / 100;
	save_flags(flags);
	sti();

	while (jiffies < target_jiffies) barrier();

	restore_flags(flags);

	outb(info->scsi.cfg[0], REG_CNTL1(info));
	inb(REG_INST(info));

	/* now for the real initialisation */
	fas216_init_chip(info);

	fas216_checkmagic(info, "fas216_init");

	return 0;
}

/* Function: int fas216_release(struct Scsi_Host *instance)
 * Purpose : release all resources and put everything to bed for
 *           FAS/NCR/AMD SCSI ic.
 * Params  : instance - a driver-specific filled-out structure
 * Returns : 0 on success
 */
int fas216_release(struct Scsi_Host *instance)
{
	FAS216_Info *info = (FAS216_Info *)instance->hostdata;

	fas216_checkmagic(info, "fas216_release");

	outb(CMD_RESETCHIP, REG_CMD(info));
	queue_free(&info->queues.disconnected);
	queue_free(&info->queues.issue);

	return 0;
}

int fas216_print_stats(FAS216_Info *info, char *buffer)
{
	return sprintf(buffer,
			"Queued commands: %-10u   Issued commands: %-10u\n"
			"Done commands  : %-10u   Reads          : %-10u\n"
			"Writes         : %-10u   Others         : %-10u\n"
			"Disconnects    : %-10u   Aborts         : %-10u\n"
			"Resets         : %-10u\n",
			info->stats.queues,      info->stats.removes,
			info->stats.fins,        info->stats.reads,
			info->stats.writes,      info->stats.miscs,
			info->stats.disconnects, info->stats.aborts,
			info->stats.resets);
}

int fas216_print_device(FAS216_Info *info, Scsi_Device *scd, char *buffer)
{
	struct fas216_device *dev = &info->device[scd->id];
	int len = 0;
	char *p;

	proc_print_scsidevice(scd, buffer, &len, 0);
	p = buffer + len;

	p += sprintf(p, "  Extensions: ");

	if (scd->tagged_supported)
		p += sprintf(p, "TAG %sabled [%d