wd33c93.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 2,078 行 · 第 1/5 页

/*
 * 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->pid);
			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 ((int)(sizeof(setup_args) / sizeof(char *)))
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_ARGS];
static int done_setup = 0;

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;
}

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 = clock_freq;
	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);
		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 */

#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("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 =
		    sx_table[round_period((unsigned int) val)].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("clock", &flags, &val, buf)) {
		if (val > 7 && val < 11)
			val = WD33C93_FS_8_10;
		else if (val > 11 && val < 16)
			val = WD33C93_FS_12_15;
		else if (val > 15 && val < 21)
			val = WD33C93_FS_16_20;
		else
			val = WD33C93_FS_8_10;
		hostdata->clock_freq = 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, i;
	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 only ONE per read):
 *    debug
 *    disconnect
 *    period
 *    resync
 *    proc
 *    nodma
 */

	if (in) {
		buf[len] = '\0';
		bp = buf;
		if (!strncmp(bp, "debug:", 6)) {
			bp += 6;
			hd->args = simple_strtoul(bp, NULL, 0) & DB_MASK;
		} else if (!strncmp(bp, "disconnect:", 11)) {
			bp += 11;
			x = simple_strtoul(bp, NULL, 0);
			if (x < DIS_NEVER || x > DIS_ALWAYS)
				x = DIS_ADAPTIVE;
			hd->disconnect = x;
		} else if (!strncmp(bp, "period:", 7)) {
			bp += 7;
			x = simple_strtoul(bp, NULL, 0);
			hd->default_sx_per =
			    sx_table[round_period((unsigned int) x)].period_ns;
		} else if (!strncmp(bp, "resync:", 7)) {
			bp += 7;
			x = simple_strtoul(bp, NULL, 0);
			for (i = 0; i < 7; i++)
				if (x & (1 << i))
					hd->sync_stat[i] = SS_UNSET;
		} else if (!strncmp(bp, "proc:", 5)) {
			bp += 5;
			hd->proc = simple_strtoul(bp, NULL, 0);
		} else if (!strncmp(bp, "nodma:", 6)) {
			bp += 6;
			hd->no_dma = simple_strtoul(bp, NULL, 0);
		} else if (!strncmp(bp, "level2:", 7)) {
			bp += 7;
			hd->level2 = simple_strtoul(bp, NULL, 0);
		}
		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",
			hd->clock_freq, hd->no_sync, hd->no_dma);
		strcat(bp, tbuf);
		strcat(bp, "\nsync_xfer[] =       ");
		for (x = 0; x < 7; x++) {
			sprintf(tbuf, "\t%02x", hd->sync_xfer[x]);
			strcat(bp, tbuf);
		}
		strcat(bp, "\nsync_stat[] =       ");
		for (x = 0; x < 7; x++) {
			sprintf(tbuf, "\t%02x", hd->sync_stat[x]);
			strcat(bp, tbuf);
		}
	}
#ifdef PROC_STATISTICS
	if (hd->proc & PR_STATISTICS) {
		strcat(bp, "\ncommands issued:    ");
		for (x = 0; x < 7; x++) {
			sprintf(tbuf, "\t%ld", hd->cmd_cnt[x]);
			strcat(bp, tbuf);
		}
		strcat(bp, "\ndisconnects allowed:");
		for (x = 0; x < 7; x++) {
			sprintf(tbuf, "\t%ld", hd->disc_allowed_cnt[x]);
			strcat(bp, tbuf);
		}
		strcat(bp, "\ndisconnects done:   ");
		for (x = 0; x < 7; x++) {
			sprintf(tbuf, "\t%ld", hd->disc_done_cnt[x]);
			strcat(bp, tbuf);
		}
		sprintf(tbuf,
			"\ninterrupts: %ld, DATA_PHASE ints: %ld DMA, %ld PIO",
			hd->int_cnt, hd->dma_cnt, hd->pio_cnt);
		strcat(bp, tbuf);
	}
#endif
	if (hd->proc & PR_CONNECTED) {
		strcat(bp, "\nconnected:     ");
		if (hd->connected) {
			cmd = (struct scsi_cmnd *) hd->connected;
			sprintf(tbuf, " %ld-%d:%d(%02x)",
				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
			strcat(bp, tbuf);
		}
	}
	if (hd->proc & PR_INPUTQ) {
		strcat(bp, "\ninput_Q:       ");
		cmd = (struct scsi_cmnd *) hd->input_Q;
		while (cmd) {
			sprintf(tbuf, " %ld-%d:%d(%02x)",
				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
			strcat(bp, tbuf);
			cmd = (struct scsi_cmnd *) cmd->host_scribble;
		}
	}
	if (hd->proc & PR_DISCQ) {
		strcat(bp, "\ndisconnected_Q:");
		cmd = (struct scsi_cmnd *) hd->disconnected_Q;
		while (cmd) {
			sprintf(tbuf, " %ld-%d:%d(%02x)",
				cmd->pid, cmd->device->id, cmd->device->lun, cmd->cmnd[0]);
			strcat(bp, tbuf);
			cmd = (struct scsi_cmnd *) cmd->host_scribble;
		}
	}
	strcat(bp, "\n");
	spin_unlock_irq(&hd->lock);
	*start = buf;
	if (stop) {
		stop = 0;
		return 0;
	}
	if (off > 0x40000)	/* ALWAYS stop after 256k bytes have been read */
		stop = 1;
	if (hd->proc & PR_STOP)	/* stop every other time */
		stop = 1;
	return strlen(bp);

#else				/* PROC_INTERFACE */

	return 0;

#endif				/* PROC_INTERFACE */

}

void
wd33c93_release(void)
{
}

EXPORT_SYMBOL(wd33c93_host_reset);
EXPORT_SYMBOL(wd33c93_init);
EXPORT_SYMBOL(wd33c93_release);
EXPORT_SYMBOL(wd33c93_abort);
EXPORT_SYMBOL(wd33c93_queuecommand);
EXPORT_SYMBOL(wd33c93_intr);
EXPORT_SYMBOL(wd33c93_proc_info);