cumana_2.c

linux-2.4.29操作系统的源码

/* 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;
	struct cumanascsi2_info *info;
	Scsi_Device *scd;

	host = scsi_host_hn_get(host_no);
	if (!host)
		return 0;

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

	info = (struct cumanascsi2_info *)host->hostdata;

	begin = 0;
	pos = sprintf(buffer, "Cumana SCSI II driver v%s\n", VERSION);
	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 int cumanascsi2_probe(struct expansion_card *ec);

/* 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.
 */
static int
cumanascsi_2_detect(Scsi_Host_Template *tpnt)
{
	static const card_ids cumanascsi_2_cids[] =
			{ CUMANASCSI2_LIST, { 0xffff, 0xffff} };
	int count = 0, ret;

	ecard_startfind();

	while (1) {
	    	struct expansion_card *ec;

		ec = ecard_find(0, cumanascsi_2_cids);
		if (!ec)
			break;

		ecard_claim(ec);
		ret = cumanascsi2_probe(ec);
		if (ret) {
			ecard_release(ec);
			break;
		}

		++count;
	}
	return count;
}

static void cumanascsi2_remove(struct Scsi_Host *host);

/* 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.
 */
static int cumanascsi_2_release(struct Scsi_Host *host)
{
	cumanascsi2_remove(host);
	return 0;
}

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,
	.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,

	.can_queue			= 1,
	.this_id			= 7,
	.sg_tablesize			= SG_ALL,
	.cmd_per_lun			= 1,
	.use_clustering			= DISABLE_CLUSTERING,
	.proc_name			= "cumanascsi2",
};

static int
cumanascsi2_probe(struct expansion_card *ec)
{
	struct Scsi_Host *host;
    	struct cumanascsi2_info *info;
    	unsigned long base;
    	int ret;

    	base = ecard_address(ec, ECARD_MEMC, 0);

	if (request_region(base + CUMANASCSI2_FAS216_OFFSET,
			   16 << CUMANASCSI2_FAS216_SHIFT, "cumanascsi2-fas")) {
		ret = -EBUSY;
		goto out;
	}

	host = scsi_register(&cumanascsi2_template,
			     sizeof(struct cumanascsi2_info));
	if (!host) {
		ret = -ENOMEM;
		goto out_region;
	}

	host->io_port = base;
	host->irq = ec->irq;
	host->dma_channel = ec->dma;

	info = (struct cumanascsi2_info *)host->hostdata;
	info->ec	= ec;
	info->dmaarea	= base + CUMANASCSI2_PSEUDODMA;
	info->status	= base + CUMANASCSI2_STATUS;
	info->alatch	= base + CUMANASCSI2_ALATCH;

	ec->irqaddr	= (unsigned char *)ioaddr(info->status);
	ec->irqmask	= STATUS_INT;
	ec->irq_data	= (void *)base + CUMANASCSI2_ALATCH;
	ec->ops		= (expansioncard_ops_t *)&cumanascsi_2_ops;

	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);

	info->info.scsi.io_port		= base + CUMANASCSI2_FAS216_OFFSET;
	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
	info->info.scsi.irq		= host->irq;
	info->info.ifcfg.clockrate	= 40; /* MHz */
	info->info.ifcfg.select_timeout	= 255;
	info->info.ifcfg.asyncperiod	= 200; /* ns */
	info->info.ifcfg.sync_max_depth	= 7;
	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.ifcfg.capabilities	= 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;

	ret = fas216_init(host);
	if (ret)
		goto out_free;

	ret = request_irq(host->irq, cumanascsi_2_intr,
			SA_INTERRUPT, "cumanascsi2", &info->info);
	if (ret) {
		printk("scsi%d: IRQ%d not free: %d\n",
		       host->host_no, host->irq, ret);
		goto out_release;
	}

	if (host->dma_channel != NO_DMA) {
		if (request_dma(host->dma_channel, "cumanascsi2")) {
			printk("scsi%d: DMA%d not free, using PIO\n",
			       host->host_no, host->dma_channel);
			host->dma_channel = NO_DMA;
		} else {
			set_dma_speed(host->dma_channel, 180);
			info->info.ifcfg.capabilities |= FASCAP_DMA;
		}
	}

	ret = fas216_add(host);
	if (ret == 0)
		goto out;

	if (host->dma_channel != NO_DMA)
		free_dma(host->dma_channel);
	free_irq(host->irq, host);

 out_release:
	fas216_release(host);

 out_free:
	scsi_unregister(host);

 out_region:
	release_region(base + CUMANASCSI2_FAS216_OFFSET,
		       16 << CUMANASCSI2_FAS216_SHIFT);

 out:
	return ret;
}

static void cumanascsi2_remove(struct Scsi_Host *host)
{
	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;

	fas216_remove(host);

	if (host->dma_channel != NO_DMA)
		free_dma(host->dma_channel);
	free_irq(host->irq, host);

	release_region(host->io_port + CUMANASCSI2_FAS216_OFFSET,
		       16 << CUMANASCSI2_FAS216_SHIFT);

	fas216_release(host);
	ecard_release(info->ec);
}

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;