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NCR53C9x.c
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NCR53C9x.c
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/* 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. */
static 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(struct 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[scmd_id(sp)];
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[scmd_id(sp)];
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;