linux/drivers/scsi/aic7xxx/aiclib.c

/*
 * Implementation of Utility functions for all SCSI device types.
 *
 * Copyright (c) 1997, 1998, 1999 Justin T. Gibbs.
 * Copyright (c) 1997, 1998 Kenneth D. Merry.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/cam/scsi/scsi_all.c,v 1.38 2002/09/23 04:56:35 mjacob Exp $
 * $Id$
 */

#include "aiclib.h"


/*
 * Table of syncrates that don't follow the "divisible by 4"
 * rule. This table will be expanded in future SCSI specs.
 */
static struct {
	u_int period_factor;
	u_int period;	/* in 100ths of ns */
} scsi_syncrates[] = {
	{ 0x08, 625 },	/* FAST-160 */
	{ 0x09, 1250 },	/* FAST-80 */
	{ 0x0a, 2500 },	/* FAST-40 40MHz */
	{ 0x0b, 3030 },	/* FAST-40 33MHz */
	{ 0x0c, 5000 }	/* FAST-20 */
};

/*
 * Return the frequency in kHz corresponding to the given
 * sync period factor.
 */
u_int
aic_calc_syncsrate(u_int period_factor)
{
	int i;
	int num_syncrates;

	num_syncrates = sizeof(scsi_syncrates) / sizeof(scsi_syncrates[0]);
	/* See if the period is in the "exception" table */
	for (i = 0; i < num_syncrates; i++) {

		if (period_factor == scsi_syncrates[i].period_factor) {
			/* Period in kHz */
			return (100000000 / scsi_syncrates[i].period);
		}
	}

	/*
	 * Wasn't in the table, so use the standard
	 * 4 times conversion.
	 */
	return (10000000 / (period_factor * 4 * 10));
}

char *
aic_parse_brace_option(char *opt_name, char *opt_arg, char *end, int depth,
		       aic_option_callback_t *callback, u_long callback_arg)
{
	char	*tok_end;
	char	*tok_end2;
	int      i;
	int      instance;
	int	 targ;
	int	 done;
	char	 tok_list[] = {'.', ',', '{', '}', '\0'};

	/* All options use a ':' name/arg separator */
	if (*opt_arg != ':')
		return (opt_arg);
	opt_arg++;
	instance = -1;
	targ = -1;
	done = FALSE;
	/*
	 * Restore separator that may be in
	 * the middle of our option argument.
	 */
	tok_end = strchr(opt_arg, '\0');
	if (tok_end < end)
		*tok_end = ',';
	while (!done) {
		switch (*opt_arg) {
		case '{':
			if (instance == -1) {
				instance = 0;
			} else {
				if (depth > 1) {
					if (targ == -1)
						targ = 0;
				} else {
					printf("Malformed Option %s\n",
					       opt_name);
					done = TRUE;
				}
			}
			opt_arg++;
			break;
		case '}':
			if (targ != -1)
				targ = -1;
			else if (instance != -1)
				instance = -1;
			opt_arg++;
			break;
		case ',':
		case '.':
			if (instance == -1)
				done = TRUE;
			else if (targ >= 0)
				targ++;
			else if (instance >= 0)
				instance++;
			opt_arg++;
			break;
		case '\0':
			done = TRUE;
			break;
		default:
			tok_end = end;
			for (i = 0; tok_list[i]; i++) {
				tok_end2 = strchr(opt_arg, tok_list[i]);
				if ((tok_end2) && (tok_end2 < tok_end))
					tok_end = tok_end2;
			}
			callback(callback_arg, instance, targ,
				 simple_strtol(opt_arg, NULL, 0));
			opt_arg = tok_end;
			break;
		}
	}
	return (opt_arg);
}