wd33c93.c

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		return SUCCESS;
	}

/*
 * Case 3: If the command is currently disconnected from the bus,
 * we're not going to expend much effort here: Let's just return
 * an ABORT_SNOOZE and hope for the best...
 */

	tmp = (struct scsi_cmnd *) hostdata->disconnected_Q;
	while (tmp) {
		if (tmp == cmd) {
			printk
			    ("scsi%d: Abort - command %ld found on disconnected_Q - ",
			     instance->host_no, cmd->serial_number);
			printk("Abort SNOOZE. ");
			enable_irq(cmd->device->host->irq);
			return FAILED;
		}
		tmp = (struct scsi_cmnd *) tmp->host_scribble;
	}

/*
 * Case 4 : If we reached this point, the command was not found in any of
 *     the queues.
 *
 * We probably reached this point because of an unlikely race condition
 * between the command completing successfully and the abortion code,
 * so we won't panic, but we will notify the user in case something really
 * broke.
 */

/*   sti();*/
	wd33c93_execute(instance);

	enable_irq(cmd->device->host->irq);
	printk("scsi%d: warning : SCSI command probably completed successfully"
	       "         before abortion. ", instance->host_no);
	return FAILED;
}

#define MAX_WD33C93_HOSTS 4
#define MAX_SETUP_ARGS ARRAY_SIZE(setup_args)
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup = 0;

static int
wd33c93_setup(char *str)
{
	int i;
	char *p1, *p2;

	/* The kernel does some processing of the command-line before calling
	 * this function: If it begins with any decimal or hex number arguments,
	 * ints[0] = how many numbers found and ints[1] through [n] are the values
	 * themselves. str points to where the non-numeric arguments (if any)
	 * start: We do our own parsing of those. We construct synthetic 'nosync'
	 * keywords out of numeric args (to maintain compatibility with older
	 * versions) and then add the rest of the arguments.
	 */

	p1 = setup_buffer;
	*p1 = '\0';
	if (str)
		strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
	setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
	p1 = setup_buffer;
	i = 0;
	while (*p1 && (i < MAX_SETUP_ARGS)) {
		p2 = strchr(p1, ',');
		if (p2) {
			*p2 = '\0';
			if (p1 != p2)
				setup_args[i] = p1;
			p1 = p2 + 1;
			i++;
		} else {
			setup_args[i] = p1;
			break;
		}
	}
	for (i = 0; i < MAX_SETUP_ARGS; i++)
		setup_used[i] = 0;
	done_setup = 1;

	return 1;
}
__setup("wd33c93=", wd33c93_setup);

/* check_setup_args() returns index if key found, 0 if not
 */
static int
check_setup_args(char *key, int *flags, int *val, char *buf)
{
	int x;
	char *cp;

	for (x = 0; x < MAX_SETUP_ARGS; x++) {
		if (setup_used[x])
			continue;
		if (!strncmp(setup_args[x], key, strlen(key)))
			break;
		if (!strncmp(setup_args[x], "next", strlen("next")))
			return 0;
	}
	if (x == MAX_SETUP_ARGS)
		return 0;
	setup_used[x] = 1;
	cp = setup_args[x] + strlen(key);
	*val = -1;
	if (*cp != ':')
		return ++x;
	cp++;
	if ((*cp >= '0') && (*cp <= '9')) {
		*val = simple_strtoul(cp, NULL, 0);
	}
	return ++x;
}

/*
 * Calculate internal data-transfer-clock cycle from input-clock
 * frequency (/MHz) and fill 'sx_table'.
 *
 * The original driver used to rely on a fixed sx_table, containing periods
 * for (only) the lower limits of the respective input-clock-frequency ranges
 * (8-10/12-15/16-20 MHz). Although it seems, that no problems ocurred with
 * this setting so far, it might be desirable to adjust the transfer periods
 * closer to the really attached, possibly 25% higher, input-clock, since
 * - the wd33c93 may really use a significant shorter period, than it has
 *   negotiated (eg. thrashing the target, which expects 4/8MHz, with 5/10MHz
 *   instead).
 * - the wd33c93 may ask the target for a lower transfer rate, than the target
 *   is capable of (eg. negotiating for an assumed minimum of 252ns instead of
 *   possible 200ns, which indeed shows up in tests as an approx. 10% lower
 *   transfer rate).
 */
static inline unsigned int
round_4(unsigned int x)
{
	switch (x & 3) {
		case 1: --x;
			break;
		case 2: ++x;
		case 3: ++x;
	}
	return x;
}

static void
calc_sx_table(unsigned int mhz, struct sx_period sx_table[9])
{
	unsigned int d, i;
	if (mhz < 11)
		d = 2;	/* divisor for  8-10 MHz input-clock */
	else if (mhz < 16)
		d = 3;	/* divisor for 12-15 MHz input-clock */
	else
		d = 4;	/* divisor for 16-20 MHz input-clock */

	d = (100000 * d) / 2 / mhz; /* 100 x DTCC / nanosec */

	sx_table[0].period_ns = 1;
	sx_table[0].reg_value = 0x20;
	for (i = 1; i < 8; i++) {
		sx_table[i].period_ns = round_4((i+1)*d / 100);
		sx_table[i].reg_value = (i+1)*0x10;
	}
	sx_table[7].reg_value = 0;
	sx_table[8].period_ns = 0;
	sx_table[8].reg_value = 0;
}

/*
 * check and, maybe, map an init- or "clock:"- argument.
 */
static uchar
set_clk_freq(int freq, int *mhz)
{
	int x = freq;
	if (WD33C93_FS_8_10 == freq)
		freq = 8;
	else if (WD33C93_FS_12_15 == freq)
		freq = 12;
	else if (WD33C93_FS_16_20 == freq)
		freq = 16;
	else if (freq > 7 && freq < 11)
		x = WD33C93_FS_8_10;
		else if (freq > 11 && freq < 16)
		x = WD33C93_FS_12_15;
		else if (freq > 15 && freq < 21)
		x = WD33C93_FS_16_20;
	else {
			/* Hmm, wouldn't it be safer to assume highest freq here? */
		x = WD33C93_FS_8_10;
		freq = 8;
	}
	*mhz = freq;
	return x;
}

/*
 * to be used with the resync: fast: ... options
 */
static inline void set_resync ( struct WD33C93_hostdata *hd, int mask )
{
	int i;
	for (i = 0; i < 8; i++)
		if (mask & (1 << i))
			hd->sync_stat[i] = SS_UNSET;
}

void
wd33c93_init(struct Scsi_Host *instance, const wd33c93_regs regs,
	     dma_setup_t setup, dma_stop_t stop, int clock_freq)
{
	struct WD33C93_hostdata *hostdata;
	int i;
	int flags;
	int val;
	char buf[32];

	if (!done_setup && setup_strings)
		wd33c93_setup(setup_strings);

	hostdata = (struct WD33C93_hostdata *) instance->hostdata;

	hostdata->regs = regs;
	hostdata->clock_freq = set_clk_freq(clock_freq, &i);
	calc_sx_table(i, hostdata->sx_table);
	hostdata->dma_setup = setup;
	hostdata->dma_stop = stop;
	hostdata->dma_bounce_buffer = NULL;
	hostdata->dma_bounce_len = 0;
	for (i = 0; i < 8; i++) {
		hostdata->busy[i] = 0;
		hostdata->sync_xfer[i] =
			calc_sync_xfer(DEFAULT_SX_PER / 4, DEFAULT_SX_OFF,
					0, hostdata->sx_table);
		hostdata->sync_stat[i] = SS_UNSET;	/* using default sync values */
#ifdef PROC_STATISTICS
		hostdata->cmd_cnt[i] = 0;
		hostdata->disc_allowed_cnt[i] = 0;
		hostdata->disc_done_cnt[i] = 0;
#endif
	}
	hostdata->input_Q = NULL;
	hostdata->selecting = NULL;
	hostdata->connected = NULL;
	hostdata->disconnected_Q = NULL;
	hostdata->state = S_UNCONNECTED;
	hostdata->dma = D_DMA_OFF;
	hostdata->level2 = L2_BASIC;
	hostdata->disconnect = DIS_ADAPTIVE;
	hostdata->args = DEBUG_DEFAULTS;
	hostdata->incoming_ptr = 0;
	hostdata->outgoing_len = 0;
	hostdata->default_sx_per = DEFAULT_SX_PER;
	hostdata->no_sync = 0xff;	/* sync defaults to off */
	hostdata->no_dma = 0;	/* default is DMA enabled */
	hostdata->fast = 0;	/* default is Fast SCSI transfers disabled */
	hostdata->dma_mode = CTRL_DMA;	/* default is Single Byte DMA */

#ifdef PROC_INTERFACE
	hostdata->proc = PR_VERSION | PR_INFO | PR_STATISTICS |
	    PR_CONNECTED | PR_INPUTQ | PR_DISCQ | PR_STOP;
#ifdef PROC_STATISTICS
	hostdata->dma_cnt = 0;
	hostdata->pio_cnt = 0;
	hostdata->int_cnt = 0;
#endif
#endif

	if (check_setup_args("clock", &flags, &val, buf)) {
		hostdata->clock_freq = set_clk_freq(val, &val);
		calc_sx_table(val, hostdata->sx_table);
	}

	if (check_setup_args("nosync", &flags, &val, buf))
		hostdata->no_sync = val;

	if (check_setup_args("nodma", &flags, &val, buf))
		hostdata->no_dma = (val == -1) ? 1 : val;

	if (check_setup_args("period", &flags, &val, buf))
		hostdata->default_sx_per =
		    hostdata->sx_table[round_period((unsigned int) val,
		                                    hostdata->sx_table)].period_ns;

	if (check_setup_args("disconnect", &flags, &val, buf)) {
		if ((val >= DIS_NEVER) && (val <= DIS_ALWAYS))
			hostdata->disconnect = val;
		else
			hostdata->disconnect = DIS_ADAPTIVE;
	}

	if (check_setup_args("level2", &flags, &val, buf))
		hostdata->level2 = val;

	if (check_setup_args("debug", &flags, &val, buf))
		hostdata->args = val & DB_MASK;

	if (check_setup_args("burst", &flags, &val, buf))
		hostdata->dma_mode = val ? CTRL_BURST:CTRL_DMA;

	if (WD33C93_FS_16_20 == hostdata->clock_freq /* divisor 4 */
		&& check_setup_args("fast", &flags, &val, buf))
		hostdata->fast = !!val;

	if ((i = check_setup_args("next", &flags, &val, buf))) {
		while (i)
			setup_used[--i] = 1;
	}
#ifdef PROC_INTERFACE
	if (check_setup_args("proc", &flags, &val, buf))
		hostdata->proc = val;
#endif

	spin_lock_irq(&hostdata->lock);
	reset_wd33c93(instance);
	spin_unlock_irq(&hostdata->lock);

	printk("wd33c93-%d: chip=%s/%d no_sync=0x%x no_dma=%d",
	       instance->host_no,
	       (hostdata->chip == C_WD33C93) ? "WD33c93" : (hostdata->chip ==
							    C_WD33C93A) ?
	       "WD33c93A" : (hostdata->chip ==
			     C_WD33C93B) ? "WD33c93B" : "unknown",
	       hostdata->microcode, hostdata->no_sync, hostdata->no_dma);
#ifdef DEBUGGING_ON
	printk(" debug_flags=0x%02x\n", hostdata->args);
#else
	printk(" debugging=OFF\n");
#endif
	printk("           setup_args=");
	for (i = 0; i < MAX_SETUP_ARGS; i++)
		printk("%s,", setup_args[i]);
	printk("\n");
	printk("           Version %s - %s, Compiled %s at %s\n",
	       WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
}

int
wd33c93_proc_info(struct Scsi_Host *instance, char *buf, char **start, off_t off, int len, int in)
{

#ifdef PROC_INTERFACE

	char *bp;
	char tbuf[128];
	struct WD33C93_hostdata *hd;
	struct scsi_cmnd *cmd;
	int x;
	static int stop = 0;

	hd = (struct WD33C93_hostdata *) instance->hostdata;

/* If 'in' is TRUE we need to _read_ the proc file. We accept the following
 * keywords (same format as command-line, but arguments are not optional):
 *    debug
 *    disconnect
 *    period
 *    resync
 *    proc
 *    nodma
 *    level2
 *    burst
 *    fast
 *    nosync
 */

	if (in) {
		buf[len] = '\0';
		for (bp = buf; *bp; ) {
			while (',' == *bp || ' ' == *bp)
				++bp;
		if (!strncmp(bp, "debug:", 6)) {
				hd->args = simple_strtoul(bp+6, &bp, 0) & DB_MASK;
		} else if (!strncmp(bp, "disconnect:", 11)) {
				x = simple_strtoul(bp+11, &bp, 0);
			if (x < DIS_NEVER || x > DIS_ALWAYS)
				x = DIS_ADAPTIVE;
			hd->disconnect = x;
		} else if (!strncmp(bp, "period:", 7)) {
			x = simple_strtoul(bp+7, &bp, 0);
			hd->default_sx_per =
				hd->sx_table[round_period((unsigned int) x,
							  hd->sx_table)].period_ns;
		} else if (!strncmp(bp, "resync:", 7)) {
				set_resync(hd, (int)simple_strtoul(bp+7, &bp, 0));
		} else if (!strncmp(bp, "proc:", 5)) {
				hd->proc = simple_strtoul(bp+5, &bp, 0);
		} else if (!strncmp(bp, "nodma:", 6)) {
				hd->no_dma = simple_strtoul(bp+6, &bp, 0);
		} else if (!strncmp(bp, "level2:", 7)) {
				hd->level2 = simple_strtoul(bp+7, &bp, 0);
			} else if (!strncmp(bp, "burst:", 6)) {
				hd->dma_mode =
					simple_strtol(bp+6, &bp, 0) ? CTRL_BURST:CTRL_DMA;
			} else if (!strncmp(bp, "fast:", 5)) {
				x = !!simple_strtol(bp+5, &bp, 0);
				if (x != hd->fast)
					set_resync(hd, 0xff);
				hd->fast = x;
			} else if (!strncmp(bp, "nosync:", 7)) {
				x = simple_strtoul(bp+7, &bp, 0);
				set_resync(hd, x ^ hd->no_sync);
				hd->no_sync = x;
			} else {
				break; /* unknown keyword,syntax-error,... */
			}
		}
		return len;
	}

	spin_lock_irq(&hd->lock);
	bp = buf;
	*bp = '\0';
	if (hd->proc & PR_VERSION) {
		sprintf(tbuf, "\nVersion %s - %s. Compiled %s %s",
			WD33C93_VERSION, WD33C93_DATE, __DATE__, __TIME__);
		strcat(bp, tbuf);
	}
	if (hd->proc & PR_INFO) {
		sprintf(tbuf, "\nclock_freq=%02x no_sync=%02x no_dma=%d"
			" dma_mode=%02x fast=%d",
			hd->clock_freq, hd->no_sync, hd->no_dma, hd->dma_mode, hd->fast);