cumana_2.c

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

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}

/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
 * Purpose  : stops DMA/PIO
 * Params   : host  - host
 *	      SCpnt - command
 */
static void
cumanascsi_2_dma_stop(struct Scsi_Host *host, Scsi_Pointer *SCp)
{
	CumanaScsi2_Info *info = (CumanaScsi2_Info *)host->hostdata;
	if (host->dma_channel != NO_DMA) {
		outb(ALATCH_DIS_DMA, info->alatch);
		disable_dma(host->dma_channel);
	}
}

/* Prototype: int cumanascsi_2_detect(Scsi_Host_Template * tpnt)
 * Purpose  : initialises Cumana SCSI 2 driver
 * Params   : tpnt - template for this SCSI adapter
 * Returns  : >0 if host found, 0 otherwise.
 */
int
cumanascsi_2_detect(Scsi_Host_Template *tpnt)
{
	static const card_ids cumanascsi_2_cids[] =
			{ CUMANASCSI2_LIST, { 0xffff, 0xffff} };
	int count = 0;
	struct Scsi_Host *host;
  
	tpnt->proc_name = "cumanascs2";
	memset(ecs, 0, sizeof (ecs));

	ecard_startfind();

	while (1) {
	    	CumanaScsi2_Info *info;

		ecs[count] = ecard_find(0, cumanascsi_2_cids);
		if (!ecs[count])
			break;

		ecard_claim(ecs[count]);

		host = scsi_register(tpnt, sizeof (CumanaScsi2_Info));
		if (!host) {
			ecard_release(ecs[count]);
			break;
		}

		host->io_port = ecard_address(ecs[count], ECARD_MEMC, 0);
		host->irq = ecs[count]->irq;
		host->dma_channel = ecs[count]->dma;
		info = (CumanaScsi2_Info *)host->hostdata;

		info->terms			= term[count] ? 1 : 0;
		cumanascsi_2_terminator_ctl(host, info->terms);

		info->info.scsi.io_port		= host->io_port + CUMANASCSI2_FAS216_OFFSET;
		info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
		info->info.scsi.irq		= host->irq;
		info->info.ifcfg.clockrate	= CUMANASCSI2_XTALFREQ;
		info->info.ifcfg.select_timeout	= 255;
		info->info.ifcfg.asyncperiod	= CUMANASCSI2_ASYNC_PERIOD;
		info->info.ifcfg.sync_max_depth	= CUMANASCSI2_SYNC_DEPTH;
		info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
		info->info.ifcfg.disconnect_ok	= 1;
		info->info.ifcfg.wide_max_size	= 0;
		info->info.dma.setup		= cumanascsi_2_dma_setup;
		info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;
		info->info.dma.stop		= cumanascsi_2_dma_stop;
		info->dmaarea			= host->io_port + CUMANASCSI2_PSEUDODMA;
		info->status			= host->io_port + CUMANASCSI2_STATUS;
		info->alatch			= host->io_port + CUMANASCSI2_ALATCH;

		ecs[count]->irqaddr	= (unsigned char *)ioaddr(info->status);
		ecs[count]->irqmask	= STATUS_INT;
		ecs[count]->irq_data	= (void *)info->alatch;
		ecs[count]->ops		= (expansioncard_ops_t *)&cumanascsi_2_ops;

		request_region(host->io_port + CUMANASCSI2_FAS216_OFFSET,
			       16 << CUMANASCSI2_FAS216_SHIFT, "cumanascsi2-fas");

		if (host->irq != NO_IRQ &&
		    request_irq(host->irq, cumanascsi_2_intr,
				SA_INTERRUPT, "cumanascsi2", host)) {
			printk("scsi%d: IRQ%d not free, interrupts disabled\n",
			       host->host_no, host->irq);
			host->irq = NO_IRQ;
			info->info.scsi.irq = NO_IRQ;
		}

		if (host->dma_channel != NO_DMA &&
		    request_dma(host->dma_channel, "cumanascsi2")) {
			printk("scsi%d: DMA%d not free, DMA disabled\n",
			       host->host_no, host->dma_channel);
			host->dma_channel = NO_DMA;
		}

		fas216_init(host);
		++count;
	}
	return count;
}

/* Prototype: int cumanascsi_2_release(struct Scsi_Host * host)
 * Purpose  : releases all resources used by this adapter
 * Params   : host - driver host structure to return info for.
 */
int cumanascsi_2_release(struct Scsi_Host *host)
{
	int i;

	fas216_release(host);

	if (host->irq != NO_IRQ)
		free_irq(host->irq, host);
	if (host->dma_channel != NO_DMA)
		free_dma(host->dma_channel);
	release_region(host->io_port + CUMANASCSI2_FAS216_OFFSET,
		       16 << CUMANASCSI2_FAS216_SHIFT);

	for (i = 0; i < MAX_ECARDS; i++)
		if (ecs[i] && host->io_port == ecard_address (ecs[i], ECARD_MEMC, 0))
			ecard_release (ecs[i]);
	return 0;
}

/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
 * Purpose  : returns a descriptive string about this interface,
 * Params   : host - driver host structure to return info for.
 * Returns  : pointer to a static buffer containing null terminated string.
 */
const char *cumanascsi_2_info(struct Scsi_Host *host)
{
	CumanaScsi2_Info *info = (CumanaScsi2_Info *)host->hostdata;
	static char string[100], *p;

	p = string;
	p += sprintf(p, "%s ", host->hostt->name);
	p += fas216_info(&info->info, p);
	p += sprintf(p, "v%d.%d.%d terminators o%s",
		     VER_MAJOR, VER_MINOR, VER_PATCH,
		     info->terms ? "n" : "ff");

	return string;
}

/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 * Purpose  : Set a driver specific function
 * Params   : host   - host to setup
 *          : buffer - buffer containing string describing operation
 *          : length - length of string
 * Returns  : -EINVAL, or 0
 */
static int
cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
{
	int ret = length;

	if (length >= 11 && strcmp(buffer, "CUMANASCSI2") == 0) {
		buffer += 11;
		length -= 11;

		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
			if (buffer[5] == '1')
				cumanascsi_2_terminator_ctl(host, 1);
			else if (buffer[5] == '0')
				cumanascsi_2_terminator_ctl(host, 0);
			else
				ret = -EINVAL;
		} else
			ret = -EINVAL;
	} else
		ret = -EINVAL;

	return ret;
}

/* Prototype: int cumanascsi_2_proc_info(char *buffer, char **start, off_t offset,
 *					 int length, int host_no, int inout)
 * Purpose  : Return information about the driver to a user process accessing
 *	      the /proc filesystem.
 * Params   : buffer - a buffer to write information to
 *	      start  - a pointer into this buffer set by this routine to the start
 *		       of the required information.
 *	      offset - offset into information that we have read upto.
 *	      length - length of buffer
 *	      host_no - host number to return information for
 *	      inout  - 0 for reading, 1 for writing.
 * Returns  : length of data written to buffer.
 */
int cumanascsi_2_proc_info (char *buffer, char **start, off_t offset,
			    int length, int host_no, int inout)
{
	int pos, begin;
	struct Scsi_Host *host = scsi_hostlist;
	CumanaScsi2_Info *info;
	Scsi_Device *scd;

	while (host) {
		if (host->host_no == host_no)
			break;
		host = host->next;
	}
	if (!host)
		return 0;

	if (inout == 1)
		return cumanascsi_2_set_proc_info(host, buffer, length);

	info = (CumanaScsi2_Info *)host->hostdata;

	begin = 0;
	pos = sprintf(buffer,
			"Cumana SCSI II driver version %d.%d.%d\n",
			VER_MAJOR, VER_MINOR, VER_PATCH);

	pos += fas216_print_host(&info->info, buffer + pos);
	pos += sprintf(buffer + pos, "Term    : o%s\n",
			info->terms ? "n" : "ff");

	pos += fas216_print_stats(&info->info, buffer + pos);

	pos += sprintf(buffer+pos, "\nAttached devices:\n");

	for (scd = host->host_queue; scd; scd = scd->next) {
		int len;

		proc_print_scsidevice(scd, buffer, &len, pos);
		pos += len;
		pos += sprintf(buffer+pos, "Extensions: ");
		if (scd->tagged_supported)
			pos += sprintf(buffer+pos, "TAG %sabled [%d] ",
				       scd->tagged_queue ? "en" : "dis",
				       scd->current_tag);
		pos += sprintf(buffer+pos, "\n");

		if (pos + begin < offset) {
			begin += pos;
			pos = 0;
		}
		if (pos + begin > offset + length)
			break;
	}

	*start = buffer + (offset - begin);
	pos -= offset - begin;
	if (pos > length)
		pos = length;

	return pos;
}

static Scsi_Host_Template cumanascsi2_template = {
	module:				THIS_MODULE,
	proc_info:			cumanascsi_2_proc_info,
	name:				"Cumana SCSI II",
	detect:				cumanascsi_2_detect,
	release:			cumanascsi_2_release,
	info:				cumanascsi_2_info,
	bios_param:			scsicam_bios_param,
	can_queue:			1,
	this_id:			7,
	sg_tablesize:			SG_ALL,
	cmd_per_lun:			1,
	use_clustering:			DISABLE_CLUSTERING,
	command:			fas216_command,
	queuecommand:			fas216_queue_command,
	eh_host_reset_handler:		fas216_eh_host_reset,
	eh_bus_reset_handler:		fas216_eh_bus_reset,
	eh_device_reset_handler:	fas216_eh_device_reset,
	eh_abort_handler:		fas216_eh_abort,
	use_new_eh_code:		1
};

static int __init cumanascsi2_init(void)
{
	scsi_register_module(MODULE_SCSI_HA, &cumanascsi2_template);
	if (cumanascsi2_template.present)
		return 0;

	scsi_unregister_module(MODULE_SCSI_HA, &cumanascsi2_template);
	return -ENODEV;
}

static void __exit cumanascsi2_exit(void)
{
	scsi_unregister_module(MODULE_SCSI_HA, &cumanascsi2_template);
}

module_init(cumanascsi2_init);
module_exit(cumanascsi2_exit);

MODULE_AUTHOR("Russell King");
MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
MODULE_PARM(term, "1-8i");
MODULE_PARM_DESC(term, "SCSI bus termination");
MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;