fas216.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

		break;

	case reject:
		outb(CMD_SETATN, REG_CMD(info));
		msgqueue_flush(&info->scsi.msgs);
		msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
		info->scsi.phase = PHASE_MSGOUT_EXPECT;

	case async:
		dev->period = info->ifcfg.asyncperiod / 4;
		dev->sof    = 0;
		dev->stp    = info->scsi.async_stp;
		fas216_set_sync(info, info->SCpnt->target);
		break;

	case none:
		break;
	}
}

/* Function: void fas216_handlewide(FAS216_Info *info, char *msg)
 * Purpose : Handle a wide transfer message from the target
 * Params  : info - state structure for interface
 *         : msg  - message from target
 */
static void
fas216_handlewide(FAS216_Info *info, char *msg)
{
	struct fas216_device *dev = &info->device[info->SCpnt->target];
	enum { wide, bit8, none, reject } res = none;

#ifdef SCSI2_WIDE
	switch (msg[0]) {
	case MESSAGE_REJECT:
		/* Wide transfer request failed.
		 * Note: SCSI II r10:
		 *
		 *  SCSI devices that are capable of wide
		 *  data transfers shall not respond to a
		 *  WDTR message with a MESSAGE REJECT message.
		 *
		 * Hence, if we get this condition, we never
		 * reattempt negociation for this device.
		 */
		if (dev->wide_state == neg_inprogress) {
			dev->wide_state = neg_invalid;
			res = bit8;
		}
		break;

	case EXTENDED_MESSAGE:
		switch (dev->wide_state) {
		/* We don't accept wide data transfer requests.
		 * Respond with a MESSAGE REJECT to prevent a
		 * wide data transfer agreement from being reached.
		 */
		case neg_invalid:
			res = reject;
			break;

		/* We were not negociating a wide data transfer,
		 * but the device sent is a negociation request.
		 * Honour the request by sending back a WDTR
		 * message containing our capability, limited by
		 * the targets capability.
		 */
		default:
			outb(CMD_SETATN, REG_CMD(info));
			if (msg[3] > info->ifcfg.wide_max_size)
				msg[3] = info->ifcfg.wide_max_size;

			msgqueue_flush(&info->scsi.msgs);
			msgqueue_addmsg(&info->scsi.msgs, 4,
					EXTENDED_MESSAGE, 2, EXTENDED_WDTR,
					msg[3]);
			info->scsi.phase = PHASE_MSGOUT_EXPECT;
			res = wide;
			break;

		/* We initiated the wide data transfer negociation,
		 * and have successfully received a response from the
		 * target.  The synchronous transfer agreement has been
		 * reached.  Note: if the values returned are out of our
		 * bounds, we must reject the message.
		 */
		case neg_inprogress:
			res = reject;
			if (msg[3] <= info->ifcfg.wide_max_size) {
				dev->wide_state = neg_complete;
				res = wide;
			}
			break;
		}
	}
#else
	res = reject;
#endif

	switch (res) {
	case wide:
		dev->wide_xfer = msg[3];
		break;

	case reject:
		outb(CMD_SETATN, REG_CMD(info));
		msgqueue_flush(&info->scsi.msgs);
		msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
		info->scsi.phase = PHASE_MSGOUT_EXPECT;

	case bit8:
		dev->wide_xfer = 0;
		break;

	case none:
		break;
	}
}

/* Function: void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
 * Purpose : update data pointers after transfer suspended/paused
 * Params  : info              - interface's local pointer to update
 *           bytes_transferred - number of bytes transferred
 */
static void
fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
{
	unsigned char *ptr;
	unsigned int residual;

	fas216_checkmagic(info);

	ptr = info->scsi.SCp.ptr;
	residual = info->scsi.SCp.this_residual;

	info->SCpnt->request_bufflen -= bytes_transferred;

	while (residual <= bytes_transferred && bytes_transferred) {
		/* We have used up this buffer */
		bytes_transferred -= residual;
		if (info->scsi.SCp.buffers_residual) {
			info->scsi.SCp.buffer++;
			info->scsi.SCp.buffers_residual--;
			ptr = (unsigned char *)info->scsi.SCp.buffer->address;
			residual = info->scsi.SCp.buffer->length;
		} else {
			ptr = NULL;
			residual = 0;
		}
	}

	residual -= bytes_transferred;
	ptr += bytes_transferred;

	if (residual == 0)
		ptr = NULL;

	info->scsi.SCp.ptr = ptr;
	info->scsi.SCp.this_residual = residual;
}

/* Function: void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
 * Purpose : transfer data off of/on to card using programmed IO
 * Params  : info      - interface to transfer data to/from
 *           direction - direction to transfer data (DMA_OUT/DMA_IN)
 * Notes   : this is incredibly slow
 */
static void
fas216_pio(FAS216_Info *info, fasdmadir_t direction)
{
	unsigned int residual;
	char *ptr;

	fas216_checkmagic(info);

	residual = info->scsi.SCp.this_residual;
	ptr = info->scsi.SCp.ptr;

	if (direction == DMA_OUT)
		outb(*ptr++, REG_FF(info));
	else
		*ptr++ = inb(REG_FF(info));

	residual -= 1;

	if (residual == 0) {
		if (info->scsi.SCp.buffers_residual) {
			info->scsi.SCp.buffer++;
			info->scsi.SCp.buffers_residual--;
			ptr = (unsigned char *)info->scsi.SCp.buffer->address;
			residual = info->scsi.SCp.buffer->length;
		} else {
			ptr = NULL;
			residual = 0;
		}
	}

	info->scsi.SCp.ptr = ptr;
	info->scsi.SCp.this_residual = residual;
}

/* Function: void fas216_starttransfer(FAS216_Info *info,
 *				       fasdmadir_t direction)
 * Purpose : Start a DMA/PIO transfer off of/on to card
 * Params  : info      - interface from which device disconnected from
 *           direction - transfer direction (DMA_OUT/DMA_IN)
 */
static void
fas216_starttransfer(FAS216_Info *info, fasdmadir_t direction, int flush_fifo)
{
	fasdmatype_t dmatype;

	fas216_checkmagic(info);

	info->scsi.phase = (direction == DMA_OUT) ?
				PHASE_DATAOUT : PHASE_DATAIN;

	if (info->dma.transfer_type != fasdma_none &&
	    info->dma.transfer_type != fasdma_pio) {
		unsigned long total, residual;

		if (info->dma.transfer_type == fasdma_real_all)
			total = info->SCpnt->request_bufflen;
		else
			total = info->scsi.SCp.this_residual;

		residual = (inb(REG_CFIS(info)) & CFIS_CF) +
			    inb(REG_CTCL(info)) +
			    (inb(REG_CTCM(info)) << 8) +
			    (inb(REG_CTCH(info)) << 16);
		fas216_updateptrs(info, total - residual);
	}
	info->dma.transfer_type = fasdma_none;

	if (!info->scsi.SCp.ptr) {
		printk("scsi%d.%c: null buffer passed to "
			"fas216_starttransfer\n", info->host->host_no,
			fas216_target(info));
		return;
	}

	/* flush FIFO */
	if (flush_fifo)
		outb(CMD_FLUSHFIFO, REG_CMD(info));

	/*
	 * Default to PIO mode or DMA mode if we have a synchronous
	 * transfer agreement.
	 */
	if (info->device[info->SCpnt->target].sof && info->dma.setup)
		dmatype = fasdma_real_all;
	else
		dmatype = fasdma_pio;

	if (info->dma.setup)
		dmatype = info->dma.setup(info->host, &info->scsi.SCp,
					  direction, dmatype);
	info->dma.transfer_type = dmatype;

	switch (dmatype) {
	case fasdma_pio:
		outb(0, REG_SOF(info));
		outb(info->scsi.async_stp, REG_STP(info));
		outb(info->scsi.SCp.this_residual, REG_STCL(info));
		outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
		outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
		outb(CMD_TRANSFERINFO, REG_CMD(info));
		fas216_pio(info, direction);
		break;

	case fasdma_pseudo:
		outb(info->scsi.SCp.this_residual, REG_STCL(info));
		outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
		outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
		outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
		info->dma.pseudo(info->host, &info->scsi.SCp,
				 direction, info->SCpnt->transfersize);
		break;

	case fasdma_real_block:
		outb(info->scsi.SCp.this_residual, REG_STCL(info));
		outb(info->scsi.SCp.this_residual >> 8, REG_STCM(info));
		outb(info->scsi.SCp.this_residual >> 16, REG_STCH(info));
		outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
		break;

	case fasdma_real_all:
		outb(info->SCpnt->request_bufflen, REG_STCL(info));
		outb(info->SCpnt->request_bufflen >> 8, REG_STCM(info));
		outb(info->SCpnt->request_bufflen >> 16, REG_STCH(info));
		outb(CMD_TRANSFERINFO | CMD_WITHDMA, REG_CMD(info));
		break;

	default:
		printk(KERN_ERR "scsi%d.%d: invalid FAS216 DMA type\n",
		       info->host->host_no, fas216_target(info));
		break;
	}
}

/* Function: void fas216_stoptransfer(FAS216_Info *info)
 * Purpose : Stop a DMA transfer onto / off of the card
 * Params  : info      - interface from which device disconnected from
 */
static void
fas216_stoptransfer(FAS216_Info *info)
{
	fas216_checkmagic(info);

	if (info->dma.transfer_type != fasdma_none &&
	    info->dma.transfer_type != fasdma_pio) {
		unsigned long total, residual;

		if ((info->dma.transfer_type == fasdma_real_all ||
		     info->dma.transfer_type == fasdma_real_block) &&
		    info->dma.stop)
			info->dma.stop(info->host, &info->scsi.SCp);

		if (info->dma.transfer_type == fasdma_real_all)
			total = info->SCpnt->request_bufflen;
		else
			total = info->scsi.SCp.this_residual;

		residual = (inb(REG_CFIS(info)) & CFIS_CF) +
			    inb(REG_CTCL(info)) +
			    (inb(REG_CTCM(info)) << 8) +
			    (inb(REG_CTCH(info)) << 16);
		fas216_updateptrs(info, total - residual);
		info->dma.transfer_type = fasdma_none;
	}
	if (info->scsi.phase == PHASE_DATAOUT)
		outb(CMD_FLUSHFIFO, REG_CMD(info));
}

/* Function: void fas216_disconnected_intr(FAS216_Info *info)
 * Purpose : handle device disconnection
 * Params  : info - interface from which device disconnected from
 */
static void
fas216_disconnect_intr(FAS216_Info *info)
{
	fas216_checkmagic(info);

#ifdef DEBUG_CONNECT
	printk("scsi%d.%c: disconnect phase=%02X\n", info->host->host_no,
		fas216_target(info), info->scsi.phase);
#endif
	msgqueue_flush(&info->scsi.msgs);

	switch (info->scsi.phase) {
	case PHASE_SELECTION:			/* while selecting - no target		*/
	case PHASE_SELSTEPS:
		fas216_done(info, DID_NO_CONNECT);
		break;

	case PHASE_MSGIN_DISCONNECT:		/* message in - disconnecting		*/
		outb(CMD_ENABLESEL, REG_CMD(info));
		info->scsi.disconnectable = 1;
		info->scsi.reconnected.tag = 0;
		info->scsi.phase = PHASE_IDLE;
		info->stats.disconnects += 1;
		break;

	case PHASE_DONE:			/* at end of command - complete		*/
		fas216_done(info, DID_OK);
		break;

	case PHASE_MSGOUT:			/* message out - possible ABORT message	*/
		if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
			info->scsi.aborting = 0;
			fas216_done(info, DID_ABORT);
			break;
		}

	default:				/* huh?					*/
		printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
			info->host->host_no, fas216_target(info), fas216_drv_phase(info));
		print_debug_list();
		fas216_stoptransfer(info);
		fas216_done(info, DID_ERROR);
		break;
	}
}

/* Function: void fas216_reselected_intr(FAS216_Info *info)
 * Purpose : Start reconnection of a device
 * Params  : info - interface which was reselected
 */
static void
fas216_reselected_intr(FAS216_Info *info)
{
	unsigned char target, identify_msg, ok;

	fas216_checkmagic(info);

	if ((info->scsi.phase == PHASE_SELECTION ||
	     info->scsi.phase == PHASE_SELSTEPS) && info->SCpnt) {
		Scsi_Cmnd *SCpnt = info->SCpnt;

		info->origSCpnt = SCpnt;
		info->SCpnt = NULL;

		if (info->device[SCpnt->target].wide_state == neg_inprogress)
			info->device[SCpnt->target].wide_state = neg_wait;
		if (info->device[SCpnt->target].sync_state == neg_inprogress)
			info->device[SCpnt->target].sync_state = neg_wait;
	}

#ifdef DEBUG_CONNECT
	printk("scsi%d.%c: reconnect phase=%02X\n", info->host->host_no,
		fas216_target(info), info->scsi.phase);
#endif

	if ((inb(REG_CFIS(info)) & CFIS_CF) != 2) {
		printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
			info->host->host_no);
		outb(CMD_SETATN, REG_CMD(info));
		outb(CMD_MSGACCEPTED, REG_CMD(info));
		msgqueue_flush(&info->scsi.msgs);
		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
		info->scsi.phase = PHASE_MSGOUT_EXPECT;
		return;
	}

	target = inb(REG_FF(info));
	identify_msg = inb(REG_FF(info));

	ok = 1;
	if (!(target & (1 << info->host->this_id))) {
		printk(KERN_ERR "scsi%d.H: invalid host id on reselect\n", info->host->host_no);
		ok = 0;
	}

	if (!(identify_msg & 0x80)) {
		printk(KERN_ERR "scsi%d.H: no IDENTIFY message on reselect, got msg %02X\n",
			info->host->host_no, identify_msg);
		ok = 0;
	}

	if (!ok) {
		/*
		 * Something went wrong - send an initiator error to
		 * the target.
		 */
		outb(CMD_SETATN, REG_CMD(info));
		outb(CMD_MSGACCEPTED, REG_CMD(info));
		msgqueue_flush(&info->scsi.msgs);
		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
		info->scsi.phase = PHASE_MSGOUT_EXPECT;
		return;
	}

	target &= ~(1 << info->host->this_id);
	switch (target) {
	case   1:  target = 0; break;
	case   2:  target = 1; break;
	case   4:  target = 2; break;
	case   8:  target = 3; break;
	case  16:  target = 4; break;
	case  32:  target = 5; break;
	case  64:  target = 6; break;
	case 128:  target = 7; break;
	default:   target = info->host->this_id; break;
	}