Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 3649 insertions, 0 deletions

diff --git a/drivers/scsi/NCR53C9x.c b/drivers/scsi/NCR53C9x.c
new file mode 100644
index 00000000000..3c86655a5f3
--- /dev/null
+++ b/drivers/scsi/NCR53C9x.c
@@ -0,0 +1,3649 @@
+/* NCR53C9x.c:  Generic SCSI driver code for NCR53C9x chips.
+ *
+ * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code.
+ *
+ * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu)
+ *
+ * Most DMA dependencies put in driver specific files by 
+ * Jesper Skov (jskov@cygnus.co.uk)
+ *
+ * Set up to use esp_read/esp_write (preprocessor macros in NCR53c9x.h) by
+ * Tymm Twillman (tymm@coe.missouri.edu)
+ */
+
+/* TODO:
+ *
+ * 1) Maybe disable parity checking in config register one for SCSI1
+ *    targets.  (Gilmore says parity error on the SBus can lock up
+ *    old sun4c's)
+ * 2) Add support for DMA2 pipelining.
+ * 3) Add tagged queueing.
+ * 4) Maybe change use of "esp" to something more "NCR"'ish.
+ */
+
+#include <linux/module.h>
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/init.h>
+
+#include "scsi.h"
+#include <scsi/scsi_host.h>
+#include "NCR53C9x.h"
+
+#include <asm/system.h>
+#include <asm/ptrace.h>
+#include <asm/pgtable.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+
+/* Command phase enumeration. */
+enum {
+	not_issued    = 0x00,  /* Still in the issue_SC queue.          */
+
+	/* Various forms of selecting a target. */
+#define in_slct_mask    0x10
+	in_slct_norm  = 0x10,  /* ESP is arbitrating, normal selection  */
+	in_slct_stop  = 0x11,  /* ESP will select, then stop with IRQ   */
+	in_slct_msg   = 0x12,  /* select, then send a message           */
+	in_slct_tag   = 0x13,  /* select and send tagged queue msg      */
+	in_slct_sneg  = 0x14,  /* select and acquire sync capabilities  */
+
+	/* Any post selection activity. */
+#define in_phases_mask  0x20
+	in_datain     = 0x20,  /* Data is transferring from the bus     */
+	in_dataout    = 0x21,  /* Data is transferring to the bus       */
+	in_data_done  = 0x22,  /* Last DMA data operation done (maybe)  */
+	in_msgin      = 0x23,  /* Eating message from target            */
+	in_msgincont  = 0x24,  /* Eating more msg bytes from target     */
+	in_msgindone  = 0x25,  /* Decide what to do with what we got    */
+	in_msgout     = 0x26,  /* Sending message to target             */
+	in_msgoutdone = 0x27,  /* Done sending msg out                  */
+	in_cmdbegin   = 0x28,  /* Sending cmd after abnormal selection  */
+	in_cmdend     = 0x29,  /* Done sending slow cmd                 */
+	in_status     = 0x2a,  /* Was in status phase, finishing cmd    */
+	in_freeing    = 0x2b,  /* freeing the bus for cmd cmplt or disc */
+	in_the_dark   = 0x2c,  /* Don't know what bus phase we are in   */
+
+	/* Special states, ie. not normal bus transitions... */
+#define in_spec_mask    0x80
+	in_abortone   = 0x80,  /* Aborting one command currently        */
+	in_abortall   = 0x81,  /* Blowing away all commands we have     */
+	in_resetdev   = 0x82,  /* SCSI target reset in progress         */
+	in_resetbus   = 0x83,  /* SCSI bus reset in progress            */
+	in_tgterror   = 0x84,  /* Target did something stupid           */
+};
+
+enum {
+	/* Zero has special meaning, see skipahead[12]. */
+/*0*/	do_never,
+
+/*1*/	do_phase_determine,
+/*2*/	do_reset_bus,
+/*3*/	do_reset_complete,
+/*4*/	do_work_bus,
+/*5*/	do_intr_end
+};
+
+/* The master ring of all esp hosts we are managing in this driver. */
+struct NCR_ESP *espchain;
+int nesps = 0, esps_in_use = 0, esps_running = 0;
+
+irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs);
+
+/* Debugging routines */
+static struct esp_cmdstrings {
+	unchar cmdchar;
+	char *text;
+} esp_cmd_strings[] = {
+	/* Miscellaneous */
+	{ ESP_CMD_NULL, "ESP_NOP", },
+	{ ESP_CMD_FLUSH, "FIFO_FLUSH", },
+	{ ESP_CMD_RC, "RSTESP", },
+	{ ESP_CMD_RS, "RSTSCSI", },
+	/* Disconnected State Group */
+	{ ESP_CMD_RSEL, "RESLCTSEQ", },
+	{ ESP_CMD_SEL, "SLCTNATN", },
+	{ ESP_CMD_SELA, "SLCTATN", },
+	{ ESP_CMD_SELAS, "SLCTATNSTOP", },
+	{ ESP_CMD_ESEL, "ENSLCTRESEL", },
+	{ ESP_CMD_DSEL, "DISSELRESEL", },
+	{ ESP_CMD_SA3, "SLCTATN3", },
+	{ ESP_CMD_RSEL3, "RESLCTSEQ", },
+	/* Target State Group */
+	{ ESP_CMD_SMSG, "SNDMSG", },
+	{ ESP_CMD_SSTAT, "SNDSTATUS", },
+	{ ESP_CMD_SDATA, "SNDDATA", },
+	{ ESP_CMD_DSEQ, "DISCSEQ", },
+	{ ESP_CMD_TSEQ, "TERMSEQ", },
+	{ ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", },
+	{ ESP_CMD_DCNCT, "DISC", },
+	{ ESP_CMD_RMSG, "RCVMSG", },
+	{ ESP_CMD_RCMD, "RCVCMD", },
+	{ ESP_CMD_RDATA, "RCVDATA", },
+	{ ESP_CMD_RCSEQ, "RCVCMDSEQ", },
+	/* Initiator State Group */
+	{ ESP_CMD_TI, "TRANSINFO", },
+	{ ESP_CMD_ICCSEQ, "INICMDSEQCOMP", },
+	{ ESP_CMD_MOK, "MSGACCEPTED", },
+	{ ESP_CMD_TPAD, "TPAD", },
+	{ ESP_CMD_SATN, "SATN", },
+	{ ESP_CMD_RATN, "RATN", },
+};
+#define NUM_ESP_COMMANDS  ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings)))
+
+/* Print textual representation of an ESP command */
+static inline void esp_print_cmd(unchar espcmd)
+{
+	unchar dma_bit = espcmd & ESP_CMD_DMA;
+	int i;
+
+	espcmd &= ~dma_bit;
+	for(i=0; i<NUM_ESP_COMMANDS; i++)
+		if(esp_cmd_strings[i].cmdchar == espcmd)
+			break;
+	if(i==NUM_ESP_COMMANDS)
+		printk("ESP_Unknown");
+	else
+		printk("%s%s", esp_cmd_strings[i].text,
+		       ((dma_bit) ? "+DMA" : ""));
+}
+
+/* Print the status register's value */
+static inline void esp_print_statreg(unchar statreg)
+{
+	unchar phase;
+
+	printk("STATUS<");
+	phase = statreg & ESP_STAT_PMASK;
+	printk("%s,", (phase == ESP_DOP ? "DATA-OUT" :
+		       (phase == ESP_DIP ? "DATA-IN" :
+			(phase == ESP_CMDP ? "COMMAND" :
+			 (phase == ESP_STATP ? "STATUS" :
+			  (phase == ESP_MOP ? "MSG-OUT" :
+			   (phase == ESP_MIP ? "MSG_IN" :
+			    "unknown")))))));
+	if(statreg & ESP_STAT_TDONE)
+		printk("TRANS_DONE,");
+	if(statreg & ESP_STAT_TCNT)
+		printk("TCOUNT_ZERO,");
+	if(statreg & ESP_STAT_PERR)
+		printk("P_ERROR,");
+	if(statreg & ESP_STAT_SPAM)
+		printk("SPAM,");
+	if(statreg & ESP_STAT_INTR)
+		printk("IRQ,");
+	printk(">");
+}
+
+/* Print the interrupt register's value */
+static inline void esp_print_ireg(unchar intreg)
+{
+	printk("INTREG< ");
+	if(intreg & ESP_INTR_S)
+		printk("SLCT_NATN ");
+	if(intreg & ESP_INTR_SATN)
+		printk("SLCT_ATN ");
+	if(intreg & ESP_INTR_RSEL)
+		printk("RSLCT ");
+	if(intreg & ESP_INTR_FDONE)
+		printk("FDONE ");
+	if(intreg & ESP_INTR_BSERV)
+		printk("BSERV ");
+	if(intreg & ESP_INTR_DC)
+		printk("DISCNCT ");
+	if(intreg & ESP_INTR_IC)
+		printk("ILL_CMD ");
+	if(intreg & ESP_INTR_SR)
+		printk("SCSI_BUS_RESET ");
+	printk(">");
+}
+
+/* Print the sequence step registers contents */
+static inline void esp_print_seqreg(unchar stepreg)
+{
+	stepreg &= ESP_STEP_VBITS;
+	printk("STEP<%s>",
+	       (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" :
+		(stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" :
+		 (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" :
+		  (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" :
+		   (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" :
+		    "UNKNOWN"))))));
+}
+
+static char *phase_string(int phase)
+{
+	switch(phase) {
+	case not_issued:
+		return "UNISSUED";
+	case in_slct_norm:
+		return "SLCTNORM";
+	case in_slct_stop:
+		return "SLCTSTOP";
+	case in_slct_msg:
+		return "SLCTMSG";
+	case in_slct_tag:
+		return "SLCTTAG";
+	case in_slct_sneg:
+		return "SLCTSNEG";
+	case in_datain:
+		return "DATAIN";
+	case in_dataout:
+		return "DATAOUT";
+	case in_data_done:
+		return "DATADONE";
+	case in_msgin:
+		return "MSGIN";
+	case in_msgincont:
+		return "MSGINCONT";
+	case in_msgindone:
+		return "MSGINDONE";
+	case in_msgout:
+		return "MSGOUT";
+	case in_msgoutdone:
+		return "MSGOUTDONE";
+	case in_cmdbegin:
+		return "CMDBEGIN";
+	case in_cmdend:
+		return "CMDEND";
+	case in_status:
+		return "STATUS";
+	case in_freeing:
+		return "FREEING";
+	case in_the_dark:
+		return "CLUELESS";
+	case in_abortone:
+		return "ABORTONE";
+	case in_abortall:
+		return "ABORTALL";
+	case in_resetdev:
+		return "RESETDEV";
+	case in_resetbus:
+		return "RESETBUS";
+	case in_tgterror:
+		return "TGTERROR";
+	default:
+		return "UNKNOWN";
+	};
+}
+
+#ifdef DEBUG_STATE_MACHINE
+static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase)
+{
+	ESPLOG(("<%s>", phase_string(newphase)));
+	s->SCp.sent_command = s->SCp.phase;
+	s->SCp.phase = newphase;
+}
+#else
+#define esp_advance_phase(__s, __newphase) \
+	(__s)->SCp.sent_command = (__s)->SCp.phase; \
+	(__s)->SCp.phase = (__newphase);
+#endif
+
+#ifdef DEBUG_ESP_CMDS
+static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs,
+			   unchar cmd)
+{
+	esp->espcmdlog[esp->espcmdent] = cmd;
+	esp->espcmdent = (esp->espcmdent + 1) & 31;
+	esp_write(eregs->esp_cmnd, cmd);
+}
+#else
+#define esp_cmd(__esp, __eregs, __cmd)	esp_write((__eregs)->esp_cmnd, (__cmd))
+#endif
+
+/* How we use the various Linux SCSI data structures for operation.
+ *
+ * struct scsi_cmnd:
+ *
+ *   We keep track of the syncronous capabilities of a target
+ *   in the device member, using sync_min_period and
+ *   sync_max_offset.  These are the values we directly write
+ *   into the ESP registers while running a command.  If offset
+ *   is zero the ESP will use asynchronous transfers.
+ *   If the borken flag is set we assume we shouldn't even bother
+ *   trying to negotiate for synchronous transfer as this target
+ *   is really stupid.  If we notice the target is dropping the
+ *   bus, and we have been allowing it to disconnect, we clear
+ *   the disconnect flag.
+ */
+
+/* Manipulation of the ESP command queues.  Thanks to the aha152x driver
+ * and its author, Juergen E. Fischer, for the methods used here.
+ * Note that these are per-ESP queues, not global queues like
+ * the aha152x driver uses.
+ */
+static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)
+{
+	Scsi_Cmnd *end;
+
+	new_SC->host_scribble = (unsigned char *) NULL;
+	if(!*SC)
+		*SC = new_SC;
+	else {
+		for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble)
+			;
+		end->host_scribble = (unsigned char *) new_SC;
+	}
+}
+
+static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC)
+{
+	new_SC->host_scribble = (unsigned char *) *SC;
+	*SC = new_SC;
+}
+
+static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC)
+{
+	Scsi_Cmnd *ptr;
+
+	ptr = *SC;
+	if(ptr)
+		*SC = (Scsi_Cmnd *) (*SC)->host_scribble;
+	return ptr;
+}
+
+static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun)
+{
+	Scsi_Cmnd *ptr, *prev;
+
+	for(ptr = *SC, prev = NULL;
+	    ptr && ((ptr->device->id != target) || (ptr->device->lun != lun));
+	    prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble)
+		;
+	if(ptr) {
+		if(prev)
+			prev->host_scribble=ptr->host_scribble;
+		else
+			*SC=(Scsi_Cmnd *)ptr->host_scribble;
+	}
+	return ptr;
+}
+
+/* Resetting various pieces of the ESP scsi driver chipset */
+
+/* Reset the ESP chip, _not_ the SCSI bus. */
+static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs)
+{
+	int family_code, version, i;
+	volatile int trash;
+
+	/* Now reset the ESP chip */
+	esp_cmd(esp, eregs, ESP_CMD_RC);
+	esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
+	if(esp->erev == fast)
+		esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB);
+	esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA);
+
+	/* This is the only point at which it is reliable to read
+	 * the ID-code for a fast ESP chip variant.
+	 */
+	esp->max_period = ((35 * esp->ccycle) / 1000);
+	if(esp->erev == fast) {
+		char *erev2string[] = {
+			"Emulex FAS236",
+			"Emulex FPESP100A",
+			"fast",
+			"QLogic FAS366",
+			"Emulex FAS216",
+			"Symbios Logic 53CF9x-2",
+			"unknown!"
+		};
+			
+		version = esp_read(eregs->esp_uid);
+		family_code = (version & 0xf8) >> 3;
+		if(family_code == 0x02) {
+		        if ((version & 7) == 2)
+			        esp->erev = fas216;	
+                        else
+			        esp->erev = fas236;
+		} else if(family_code == 0x0a)
+			esp->erev = fas366; /* Version is usually '5'. */
+		else if(family_code == 0x00) {
+			if ((version & 7) == 2)
+				esp->erev = fas100a; /* NCR53C9X */
+			else
+				esp->erev = espunknown;
+		} else if(family_code == 0x14) {
+			if ((version & 7) == 2)
+				esp->erev = fsc;
+		        else
+				esp->erev = espunknown;
+		} else if(family_code == 0x00) {
+			if ((version & 7) == 2)
+				esp->erev = fas100a; /* NCR53C9X */
+			else
+				esp->erev = espunknown;
+		} else
+			esp->erev = espunknown;
+		ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n",
+			esp->esp_id, erev2string[esp->erev - fas236],
+			family_code, (version & 7)));
+
+		esp->min_period = ((4 * esp->ccycle) / 1000);
+	} else {
+		esp->min_period = ((5 * esp->ccycle) / 1000);
+	}
+
+	/* Reload the configuration registers */
+	esp_write(eregs->esp_cfact, esp->cfact);
+	esp->prev_stp = 0;
+	esp_write(eregs->esp_stp, 0);
+	esp->prev_soff = 0;
+	esp_write(eregs->esp_soff, 0);
+	esp_write(eregs->esp_timeo, esp->neg_defp);
+	esp->max_period = (esp->max_period + 3)>>2;
+	esp->min_period = (esp->min_period + 3)>>2;
+
+	esp_write(eregs->esp_cfg1, esp->config1);
+	switch(esp->erev) {
+	case esp100:
+		/* nothing to do */
+		break;
+	case esp100a:
+		esp_write(eregs->esp_cfg2, esp->config2);
+		break;
+	case esp236:
+		/* Slow 236 */
+		esp_write(eregs->esp_cfg2, esp->config2);
+		esp->prev_cfg3 = esp->config3[0];
+		esp_write(eregs->esp_cfg3, esp->prev_cfg3);
+		break;
+	case fas366:
+		panic("esp: FAS366 support not present, please notify "
+		      "jongk@cs.utwente.nl");
+		break;
+	case fas216:
+	case fas236:
+	case fsc:
+		/* Fast ESP variants */
+		esp_write(eregs->esp_cfg2, esp->config2);
+		for(i=0; i<8; i++)
+			esp->config3[i] |= ESP_CONFIG3_FCLK;
+		esp->prev_cfg3 = esp->config3[0];
+		esp_write(eregs->esp_cfg3, esp->prev_cfg3);
+		if(esp->diff)
+			esp->radelay = 0;
+		else
+			esp->radelay = 16;
+		/* Different timeout constant for these chips */
+		esp->neg_defp =
+			FSC_NEG_DEFP(esp->cfreq,
+				     (esp->cfact == ESP_CCF_F0 ?
+				      ESP_CCF_F7 + 1 : esp->cfact));
+		esp_write(eregs->esp_timeo, esp->neg_defp);
+		/* Enable Active Negotiation if possible */
+		if((esp->erev == fsc) && !esp->diff)
+			esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN);
+		break;
+	case fas100a:
+		/* Fast 100a */
+		esp_write(eregs->esp_cfg2, esp->config2);
+		for(i=0; i<8; i++)
+			esp->config3[i] |= ESP_CONFIG3_FCLOCK;
+		esp->prev_cfg3 = esp->config3[0];
+		esp_write(eregs->esp_cfg3, esp->prev_cfg3);
+		esp->radelay = 32;
+		break;
+	default:
+		panic("esp: what could it be... I wonder...");
+		break;
+	};
+
+	/* Eat any bitrot in the chip */
+	trash = esp_read(eregs->esp_intrpt);
+	udelay(100);
+}
+
+/* This places the ESP into a known state at boot time. */
+void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs)
+{
+	volatile unchar trash;
+
+	/* Reset the DMA */
+	if(esp->dma_reset)
+		esp->dma_reset(esp);
+
+	/* Reset the ESP */
+	esp_reset_esp(esp, eregs);
+
+	/* Reset the SCSI bus, but tell ESP not to generate an irq */
+	esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB));
+	esp_cmd(esp, eregs, ESP_CMD_RS);
+	udelay(400);
+	esp_write(eregs->esp_cfg1, esp->config1);
+
+	/* Eat any bitrot in the chip and we are done... */
+	trash = esp_read(eregs->esp_intrpt);
+}
+
+/* Allocate structure and insert basic data such as SCSI chip frequency
+ * data and a pointer to the device
+ */
+struct NCR_ESP* esp_allocate(Scsi_Host_Template *tpnt, void *esp_dev)
+{
+	struct NCR_ESP *esp, *elink;
+	struct Scsi_Host *esp_host;
+
+	esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP));
+	if(!esp_host)
+		panic("Cannot register ESP SCSI host");
+	esp = (struct NCR_ESP *) esp_host->hostdata;
+	if(!esp)
+		panic("No esp in hostdata");
+	esp->ehost = esp_host;
+	esp->edev = esp_dev;
+	esp->esp_id = nesps++;
+
+	/* Set bitshift value (only used on Amiga with multiple ESPs) */
+	esp->shift = 2;
+
+	/* Put into the chain of esp chips detected */
+	if(espchain) {
+		elink = espchain;
+		while(elink->next) elink = elink->next;
+		elink->next = esp;
+	} else {
+		espchain = esp;
+	}
+	esp->next = NULL;
+
+	return esp;
+}
+
+void esp_deallocate(struct NCR_ESP *esp)
+{
+	struct NCR_ESP *elink;
+
+	if(espchain == esp) {
+		espchain = NULL;
+	} else {
+		for(elink = espchain; elink && (elink->next != esp); elink = elink->next);
+		if(elink) 
+			elink->next = esp->next;
+	}
+	nesps--;
+}
+
+/* Complete initialization of ESP structure and device
+ * Caller must have initialized appropriate parts of the ESP structure
+ * between the call to esp_allocate and this function.
+ */
+void esp_initialize(struct NCR_ESP *esp)
+{
+	struct ESP_regs *eregs = esp->eregs;
+	unsigned int fmhz;
+	unchar ccf;
+	int i;
+	
+	/* Check out the clock properties of the chip. */
+
+	/* This is getting messy but it has to be done
+	 * correctly or else you get weird behavior all
+	 * over the place.  We are trying to basically
+	 * figure out three pieces of information.
+	 *
+	 * a) Clock Conversion Factor
+	 *
+	 *    This is a representation of the input
+	 *    crystal clock frequency going into the
+	 *    ESP on this machine.  Any operation whose
+	 *    timing is longer than 400ns depends on this
+	 *    value being correct.  For example, you'll
+	 *    get blips for arbitration/selection during
+	 *    high load or with multiple targets if this
+	 *    is not set correctly.
+	 *
+	 * b) Selection Time-Out
+	 *
+	 *    The ESP isn't very bright and will arbitrate
+	 *    for the bus and try to select a target
+	 *    forever if you let it.  This value tells
+	 *    the ESP when it has taken too long to
+	 *    negotiate and that it should interrupt
+	 *    the CPU so we can see what happened.
+	 *    The value is computed as follows (from
+	 *    NCR/Symbios chip docs).
+	 *
+	 *          (Time Out Period) *  (Input Clock)
+	 *    STO = ----------------------------------
+	 *          (8192) * (Clock Conversion Factor)
+	 *
+	 *    You usually want the time out period to be
+	 *    around 250ms, I think we'll set it a little
+	 *    bit higher to account for fully loaded SCSI
+	 *    bus's and slow devices that don't respond so
+	 *    quickly to selection attempts. (yeah, I know
+	 *    this is out of spec. but there is a lot of
+	 *    buggy pieces of firmware out there so bite me)
+	 *
+	 * c) Imperical constants for synchronous offset
+	 *    and transfer period register values
+	 *
+	 *    This entails the smallest and largest sync
+	 *    period we could ever handle on this ESP.
+	 */
+	
+	fmhz = esp->cfreq;
+
+	if(fmhz <= (5000000))
+		ccf = 0;
+	else
+		ccf = (((5000000 - 1) + (fmhz))/(5000000));
+	if(!ccf || ccf > 8) {
+		/* If we can't find anything reasonable,
+		 * just assume 20MHZ.  This is the clock
+		 * frequency of the older sun4c's where I've
+		 * been unable to find the clock-frequency
+		 * PROM property.  All other machines provide
+		 * useful values it seems.
+		 */
+		ccf = ESP_CCF_F4;
+		fmhz = (20000000);
+	}
+	if(ccf==(ESP_CCF_F7+1))
+		esp->cfact = ESP_CCF_F0;
+	else if(ccf == ESP_CCF_NEVER)
+		esp->cfact = ESP_CCF_F2;
+	else
+		esp->cfact = ccf;
+	esp->cfreq = fmhz;
+	esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz);
+	esp->ctick = ESP_TICK(ccf, esp->ccycle);
+	esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf);
+	esp->sync_defp = SYNC_DEFP_SLOW;
+
+	printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ",
+	       esp->scsi_id, (esp->cfreq / 1000000),
+	       ccf, (int) esp->neg_defp);
+
+	/* Fill in ehost data */
+	esp->ehost->base = (unsigned long)eregs;
+	esp->ehost->this_id = esp->scsi_id;
+	esp->ehost->irq = esp->irq;
+
+	/* SCSI id mask */
+	esp->scsi_id_mask = (1 << esp->scsi_id);
+
+	/* Probe the revision of this esp */
+	esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7));
+	esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY);
+	esp_write(eregs->esp_cfg2, esp->config2);
+	if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) !=
+	   (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) {
+		printk("NCR53C90(esp100)\n");
+		esp->erev = esp100;
+	} else {
+		esp->config2 = 0;
+		esp_write(eregs->esp_cfg2, 0);
+		esp_write(eregs->esp_cfg3, 5);
+		if(esp_read(eregs->esp_cfg3) != 5) {
+			printk("NCR53C90A(esp100a)\n");
+			esp->erev = esp100a;
+		} else {
+			int target;
+
+			for(target=0; target<8; target++)
+				esp->config3[target] = 0;
+			esp->prev_cfg3 = 0;
+			esp_write(eregs->esp_cfg3, 0);
+			if(ccf > ESP_CCF_F5) {
+				printk("NCR53C9XF(espfast)\n");
+				esp->erev = fast;
+				esp->sync_defp = SYNC_DEFP_FAST;
+			} else {
+				printk("NCR53C9x(esp236)\n");
+				esp->erev = esp236;
+			}
+		}
+	}				
+
+	/* Initialize the command queues */
+	esp->current_SC = NULL;
+	esp->disconnected_SC = NULL;
+	esp->issue_SC = NULL;
+
+	/* Clear the state machines. */
+	esp->targets_present = 0;
+	esp->resetting_bus = 0;
+	esp->snip = 0;
+
+	init_waitqueue_head(&esp->reset_queue);
+
+	esp->fas_premature_intr_workaround = 0;
+	for(i = 0; i < 32; i++)
+		esp->espcmdlog[i] = 0;
+	esp->espcmdent = 0;
+	for(i = 0; i < 16; i++) {
+		esp->cur_msgout[i] = 0;
+		esp->cur_msgin[i] = 0;
+	}
+	esp->prevmsgout = esp->prevmsgin = 0;
+	esp->msgout_len = esp->msgin_len = 0;
+
+	/* Clear the one behind caches to hold unmatchable values. */
+	esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff;
+
+	/* Reset the thing before we try anything... */
+	esp_bootup_reset(esp, eregs);
+
+	esps_in_use++;
+}
+
+/* The info function will return whatever useful
+ * information the developer sees fit.  If not provided, then
+ * the name field will be used instead.
+ */
+const char *esp_info(struct Scsi_Host *host)
+{
+	struct NCR_ESP *esp;
+
+	esp = (struct NCR_ESP *) host->hostdata;
+	switch(esp->erev) {
+	case esp100:
+		return "ESP100 (NCR53C90)";
+	case esp100a:
+		return "ESP100A (NCR53C90A)";
+	case esp236:
+		return "ESP236 (NCR53C9x)";
+	case fas216:
+		return "Emulex FAS216";
+	case fas236:
+		return "Emulex FAS236";
+	case fas366:
+		return "QLogic FAS366";
+	case fas100a:
+		return "FPESP100A";
+	case fsc:
+		return "Symbios Logic 53CF9x-2";
+	default:
+		panic("Bogon ESP revision");
+	};
+}
+
+/* From Wolfgang Stanglmeier's NCR scsi driver. */
+struct info_str
+{
+	char *buffer;
+	int length;
+	int offset;
+	int pos;
+};
+
+static void copy_mem_info(struct info_str *info, char *data, int len)
+{
+	if (info->pos + len > info->length)
+		len = info->length - info->pos;
+
+	if (info->pos + len < info->offset) {
+		info->pos += len;
+		return;
+	}
+	if (info->pos < info->offset) {
+		data += (info->offset - info->pos);
+		len  -= (info->offset - info->pos);
+	}
+
+	if (len > 0) {
+		memcpy(info->buffer + info->pos, data, len);
+		info->pos += len;
+	}
+}
+
+static int copy_info(struct info_str *info, char *fmt, ...)
+{
+	va_list args;
+	char buf[81];
+	int len;
+
+	va_start(args, fmt);
+	len = vsprintf(buf, fmt, args);
+	va_end(args);
+
+	copy_mem_info(info, buf, len);
+	return len;
+}
+
+static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len)
+{
+	struct scsi_device *sdev;
+	struct info_str info;
+	int i;
+
+	info.buffer	= ptr;
+	info.length	= len;
+	info.offset	= offset;
+	info.pos	= 0;
+
+	copy_info(&info, "ESP Host Adapter:\n");
+	copy_info(&info, "\tESP Model\t\t");
+	switch(esp->erev) {
+	case esp100:
+		copy_info(&info, "ESP100 (NCR53C90)\n");
+		break;
+	case esp100a:
+		copy_info(&info, "ESP100A (NCR53C90A)\n");
+		break;
+	case esp236:
+		copy_info(&info, "ESP236 (NCR53C9x)\n");
+		break;
+	case fas216:
+		copy_info(&info, "Emulex FAS216\n");
+		break;
+	case fas236:
+		copy_info(&info, "Emulex FAS236\n");
+		break;
+	case fas100a:
+		copy_info(&info, "FPESP100A\n");
+		break;
+	case fast:
+		copy_info(&info, "Generic FAST\n");
+		break;
+	case fas366:
+		copy_info(&info, "QLogic FAS366\n");
+		break;
+	case fsc:
+		copy_info(&info, "Symbios Logic 53C9x-2\n");
+		break;
+	case espunknown:
+	default:
+		copy_info(&info, "Unknown!\n");
+		break;
+	};
+	copy_info(&info, "\tLive Targets\t\t[ ");
+	for(i = 0; i < 15; i++) {
+		if(esp->targets_present & (1 << i))
+			copy_info(&info, "%d ", i);
+	}
+	copy_info(&info, "]\n\n");
+	
+	/* Now describe the state of each existing target. */
+	copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n");
+
+	shost_for_each_device(sdev, esp->ehost) {
+		struct esp_device *esp_dev = sdev->hostdata;
+		uint id = sdev->id;
+
+		if (!(esp->targets_present & (1 << id)))
+			continue;
+
+		copy_info(&info, "%d\t\t", id);
+		copy_info(&info, "%08lx\t", esp->config3[id]);
+		copy_info(&info, "[%02lx,%02lx]\t\t\t",
+			esp_dev->sync_max_offset,
+			esp_dev->sync_min_period);
+		copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no");
+	}
+
+	return info.pos > info.offset? info.pos - info.offset : 0;
+}
+
+/* ESP proc filesystem code. */
+int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length,
+		  int inout)
+{
+	struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata;
+
+	if(inout)
+		return -EINVAL; /* not yet */
+	if(start)
+		*start = buffer;
+	return esp_host_info(esp, buffer, offset, length);
+}
+
+static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	if(sp->use_sg == 0) {
+		sp->SCp.this_residual = sp->request_bufflen;
+		sp->SCp.buffer = (struct scatterlist *) sp->request_buffer;
+		sp->SCp.buffers_residual = 0;
+		if (esp->dma_mmu_get_scsi_one)
+			esp->dma_mmu_get_scsi_one(esp, sp);
+		else
+			sp->SCp.ptr =
+				(char *) virt_to_phys(sp->request_buffer);
+	} else {
+		sp->SCp.buffer = (struct scatterlist *) sp->buffer;
+		sp->SCp.buffers_residual = sp->use_sg - 1;
+		sp->SCp.this_residual = sp->SCp.buffer->length;
+		if (esp->dma_mmu_get_scsi_sgl)
+			esp->dma_mmu_get_scsi_sgl(esp, sp);
+		else
+			sp->SCp.ptr =
+				(char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset));
+	}
+}
+
+static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	if(sp->use_sg == 0) {
+		if (esp->dma_mmu_release_scsi_one)
+			esp->dma_mmu_release_scsi_one(esp, sp);
+	} else {
+		if (esp->dma_mmu_release_scsi_sgl)
+			esp->dma_mmu_release_scsi_sgl(esp, sp);
+	}
+}
+
+static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
+
+	sp->SCp.ptr = ep->saved_ptr;
+	sp->SCp.buffer = ep->saved_buffer;
+	sp->SCp.this_residual = ep->saved_this_residual;
+	sp->SCp.buffers_residual = ep->saved_buffers_residual;
+}
+
+static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	struct esp_pointers *ep = &esp->data_pointers[sp->device->id];
+
+	ep->saved_ptr = sp->SCp.ptr;
+	ep->saved_buffer = sp->SCp.buffer;
+	ep->saved_this_residual = sp->SCp.this_residual;
+	ep->saved_buffers_residual = sp->SCp.buffers_residual;
+}
+
+/* Some rules:
+ *
+ *   1) Never ever panic while something is live on the bus.
+ *      If there is to be any chance of syncing the disks this
+ *      rule is to be obeyed.
+ *
+ *   2) Any target that causes a foul condition will no longer
+ *      have synchronous transfers done to it, no questions
+ *      asked.
+ *
+ *   3) Keep register accesses to a minimum.  Think about some
+ *      day when we have Xbus machines this is running on and
+ *      the ESP chip is on the other end of the machine on a
+ *      different board from the cpu where this is running.
+ */
+
+/* Fire off a command.  We assume the bus is free and that the only
+ * case where we could see an interrupt is where we have disconnected
+ * commands active and they are trying to reselect us.
+ */
+static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp)
+{
+	switch(sp->cmd_len) {
+	case 6:
+	case 10:
+	case 12:
+		esp->esp_slowcmd = 0;
+		break;
+
+	default:
+		esp->esp_slowcmd = 1;
+		esp->esp_scmdleft = sp->cmd_len;
+		esp->esp_scmdp = &sp->cmnd[0];
+		break;
+	};
+}
+
+static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset)
+{
+	esp->cur_msgout[0] = EXTENDED_MESSAGE;
+	esp->cur_msgout[1] = 3;
+	esp->cur_msgout[2] = EXTENDED_SDTR;
+	esp->cur_msgout[3] = period;
+	esp->cur_msgout[4] = offset;
+	esp->msgout_len = 5;
+}
+
+static void esp_exec_cmd(struct NCR_ESP *esp)
+{
+	struct ESP_regs *eregs = esp->eregs;
+	struct esp_device *esp_dev;
+	Scsi_Cmnd *SCptr;
+	Scsi_Device *SDptr;
+	volatile unchar *cmdp = esp->esp_command;
+	unsigned char the_esp_command;
+	int lun, target;
+	int i;
+
+	/* Hold off if we have disconnected commands and
+	 * an IRQ is showing...
+	 */
+	if(esp->disconnected_SC && esp->dma_irq_p(esp))
+		return;
+
+	/* Grab first member of the issue queue. */
+	SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC);
+
+	/* Safe to panic here because current_SC is null. */
+	if(!SCptr)
+		panic("esp: esp_exec_cmd and issue queue is NULL");
+
+	SDptr = SCptr->device;
+	esp_dev = SDptr->hostdata;
+	lun = SCptr->device->lun;
+	target = SCptr->device->id;
+
+	esp->snip = 0;
+	esp->msgout_len = 0;
+
+	/* Send it out whole, or piece by piece?   The ESP
+	 * only knows how to automatically send out 6, 10,
+	 * and 12 byte commands.  I used to think that the
+	 * Linux SCSI code would never throw anything other
+	 * than that to us, but then again there is the
+	 * SCSI generic driver which can send us anything.
+	 */
+	esp_check_cmd(esp, SCptr);
+
+	/* If arbitration/selection is successful, the ESP will leave
+	 * ATN asserted, causing the target to go into message out
+	 * phase.  The ESP will feed the target the identify and then
+	 * the target can only legally go to one of command,
+	 * datain/out, status, or message in phase, or stay in message
+	 * out phase (should we be trying to send a sync negotiation
+	 * message after the identify).  It is not allowed to drop
+	 * BSY, but some buggy targets do and we check for this
+	 * condition in the selection complete code.  Most of the time
+	 * we'll make the command bytes available to the ESP and it
+	 * will not interrupt us until it finishes command phase, we
+	 * cannot do this for command sizes the ESP does not
+	 * understand and in this case we'll get interrupted right
+	 * when the target goes into command phase.
+	 *
+	 * It is absolutely _illegal_ in the presence of SCSI-2 devices
+	 * to use the ESP select w/o ATN command.  When SCSI-2 devices are
+	 * present on the bus we _must_ always go straight to message out
+	 * phase with an identify message for the target.  Being that
+	 * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2
+	 * selections should not confuse SCSI-1 we hope.
+	 */
+
+	if(esp_dev->sync) {
+		/* this targets sync is known */
+#ifdef CONFIG_SCSI_MAC_ESP
+do_sync_known:
+#endif
+		if(esp_dev->disconnect)
+			*cmdp++ = IDENTIFY(1, lun);
+		else
+			*cmdp++ = IDENTIFY(0, lun);
+
+		if(esp->esp_slowcmd) {
+			the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
+			esp_advance_phase(SCptr, in_slct_stop);
+		} else {
+			the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
+			esp_advance_phase(SCptr, in_slct_norm);
+		}
+	} else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) {
+		/* After the bootup SCSI code sends both the
+		 * TEST_UNIT_READY and INQUIRY commands we want
+		 * to at least attempt allowing the device to
+		 * disconnect.
+		 */
+		ESPMISC(("esp: Selecting device for first time. target=%d "
+			 "lun=%d\n", target, SCptr->device->lun));
+		if(!SDptr->borken && !esp_dev->disconnect)
+			esp_dev->disconnect = 1;
+
+		*cmdp++ = IDENTIFY(0, lun);
+		esp->prevmsgout = NOP;
+		esp_advance_phase(SCptr, in_slct_norm);
+		the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA);
+
+		/* Take no chances... */
+		esp_dev->sync_max_offset = 0;
+		esp_dev->sync_min_period = 0;
+	} else {
+		int toshiba_cdrom_hwbug_wkaround = 0;
+
+#ifdef CONFIG_SCSI_MAC_ESP
+		/* Never allow synchronous transfers (disconnect OK) on
+		 * Macintosh. Well, maybe later when we figured out how to 
+		 * do DMA on the machines that support it ...
+		 */
+		esp_dev->disconnect = 1;
+		esp_dev->sync_max_offset = 0;
+		esp_dev->sync_min_period = 0;
+		esp_dev->sync = 1;
+		esp->snip = 0;
+		goto do_sync_known;
+#endif
+		/* We've talked to this guy before,
+		 * but never negotiated.  Let's try
+		 * sync negotiation.
+		 */
+		if(!SDptr->borken) {
+			if((SDptr->type == TYPE_ROM) &&
+			   (!strncmp(SDptr->vendor, "TOSHIBA", 7)