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linux / linux / kernel / git / torvalds / linux / 833f73299fdf4497af1552e219e95661f4d2cdca / . / drivers / scsi / 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/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->request_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;
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;
struct 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))) {
/* Nice try sucker... */
ESPMISC(("esp%d: Disabling sync for buggy "
"Toshiba CDROM.\n", esp->esp_id));
toshiba_cdrom_hwbug_wkaround = 1;
build_sync_nego_msg(esp, 0, 0);
} else {
build_sync_nego_msg(esp, esp->sync_defp, 15);
}
} else {
build_sync_nego_msg(esp, 0, 0);
}
esp_dev->sync = 1;
esp->snip = 1;
/* A fix for broken SCSI1 targets, when they disconnect
* they lock up the bus and confuse ESP. So disallow
* disconnects for SCSI1 targets for now until we
* find a better fix.
*
* Addendum: This is funny, I figured out what was going
* on. The blotzed SCSI1 target would disconnect,
* one of the other SCSI2 targets or both would be
* disconnected as well. The SCSI1 target would
* stay disconnected long enough that we start
* up a command on one of the SCSI2 targets. As
* the ESP is arbitrating for the bus the SCSI1
* target begins to arbitrate as well to reselect
* the ESP. The SCSI1 target refuses to drop it's
* ID bit on the data bus even though the ESP is
* at ID 7 and is the obvious winner for any
* arbitration. The ESP is a poor sport and refuses
* to lose arbitration, it will continue indefinitely
* trying to arbitrate for the bus and can only be
* stopped via a chip reset or SCSI bus reset.
* Therefore _no_ disconnects for SCSI1 targets
* thank you very much. ;-)
*/
if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) ||
toshiba_cdrom_hwbug_wkaround || SDptr->borken) {
ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d "
"lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
esp_dev->disconnect = 0;
*cmdp++ = IDENTIFY(0, lun);
} else {
*cmdp++ = IDENTIFY(1, lun);
}
/* ESP fifo is only so big...
* Make this look like a slow command.
*/
esp->esp_slowcmd = 1;
esp->esp_scmdleft = SCptr->cmd_len;
esp->esp_scmdp = &SCptr->cmnd[0];
the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA);
esp_advance_phase(SCptr, in_slct_msg);
}
if(!esp->esp_slowcmd)
for(i = 0; i < SCptr->cmd_len; i++)
*cmdp++ = SCptr->cmnd[i];
esp_write(eregs->esp_busid, (target & 7));
if (esp->prev_soff != esp_dev->sync_max_offset ||
esp->prev_stp != esp_dev->sync_min_period ||
(esp->erev > esp100a &&
esp->prev_cfg3 != esp->config3[target])) {
esp->prev_soff = esp_dev->sync_max_offset;
esp_write(eregs->esp_soff, esp->prev_soff);
esp->prev_stp = esp_dev->sync_min_period;
esp_write(eregs->esp_stp, esp->prev_stp);
if(esp->erev > esp100a) {
esp->prev_cfg3 = esp->config3[target];
esp_write(eregs->esp_cfg3, esp->prev_cfg3);
}
}
i = (cmdp - esp->esp_command);
/* Set up the DMA and ESP counters */
if(esp->do_pio_cmds){
int j = 0;
/*
* XXX MSch:
*
* It seems this is required, at least to clean up
* after failed commands when using PIO mode ...
*/
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
for(;j<i;j++)
esp_write(eregs->esp_fdata, esp->esp_command[j]);
the_esp_command &= ~ESP_CMD_DMA;
/* Tell ESP to "go". */
esp_cmd(esp, eregs, the_esp_command);
} else {
/* Set up the ESP counters */
esp_write(eregs->esp_tclow, i);
esp_write(eregs->esp_tcmed, 0);
esp->dma_init_write(esp, esp->esp_command_dvma, i);
/* Tell ESP to "go". */
esp_cmd(esp, eregs, the_esp_command);
}
}
/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */
int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *))
{
struct NCR_ESP *esp;
/* Set up func ptr and initial driver cmd-phase. */
SCpnt->scsi_done = done;
SCpnt->SCp.phase = not_issued;
esp = (struct NCR_ESP *) SCpnt->device->host->hostdata;
if(esp->dma_led_on)
esp->dma_led_on(esp);
/* We use the scratch area. */
ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun));
ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun));
esp_get_dmabufs(esp, SCpnt);
esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */
SCpnt->SCp.Status = CHECK_CONDITION;
SCpnt->SCp.Message = 0xff;
SCpnt->SCp.sent_command = 0;
/* Place into our queue. */
if(SCpnt->cmnd[0] == REQUEST_SENSE) {
ESPQUEUE(("RQSENSE\n"));
prepend_SC(&esp->issue_SC, SCpnt);
} else {
ESPQUEUE(("\n"));
append_SC(&esp->issue_SC, SCpnt);
}
/* Run it now if we can. */
if(!esp->current_SC && !esp->resetting_bus)
esp_exec_cmd(esp);
return 0;
}
/* Dump driver state. */
static void esp_dump_cmd(Scsi_Cmnd *SCptr)
{
ESPLOG(("[tgt<%02x> lun<%02x> "
"pphase<%s> cphase<%s>]",
SCptr->device->id, SCptr->device->lun,
phase_string(SCptr->SCp.sent_command),
phase_string(SCptr->SCp.phase)));
}
static void esp_dump_state(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
#ifdef DEBUG_ESP_CMDS
int i;
#endif
ESPLOG(("esp%d: dumping state\n", esp->esp_id));
/* Print DMA status */
esp->dma_dump_state(esp);
ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
esp->esp_id, esp->sreg, esp->seqreg, esp->ireg));
ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep),
esp_read(eregs->esp_intrpt)));
#ifdef DEBUG_ESP_CMDS
printk("esp%d: last ESP cmds [", esp->esp_id);
i = (esp->espcmdent - 1) & 31;
printk("<");
esp_print_cmd(esp->espcmdlog[i]);
printk(">");
i = (i - 1) & 31;
printk("<");
esp_print_cmd(esp->espcmdlog[i]);
printk(">");
i = (i - 1) & 31;
printk("<");
esp_print_cmd(esp->espcmdlog[i]);
printk(">");
i = (i - 1) & 31;
printk("<");
esp_print_cmd(esp->espcmdlog[i]);
printk(">");
printk("]\n");
#endif /* (DEBUG_ESP_CMDS) */
if(SCptr) {
ESPLOG(("esp%d: current command ", esp->esp_id));
esp_dump_cmd(SCptr);
}
ESPLOG(("\n"));
SCptr = esp->disconnected_SC;
ESPLOG(("esp%d: disconnected ", esp->esp_id));
while(SCptr) {
esp_dump_cmd(SCptr);
SCptr = (Scsi_Cmnd *) SCptr->host_scribble;
}
ESPLOG(("\n"));
}
/* Abort a command. The host_lock is acquired by caller. */
int esp_abort(Scsi_Cmnd *SCptr)
{
struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata;
struct ESP_regs *eregs = esp->eregs;
int don;
ESPLOG(("esp%d: Aborting command\n", esp->esp_id));
esp_dump_state(esp, eregs);
/* Wheee, if this is the current command on the bus, the
* best we can do is assert ATN and wait for msgout phase.
* This should even fix a hung SCSI bus when we lose state
* in the driver and timeout because the eventual phase change
* will cause the ESP to (eventually) give an interrupt.
*/
if(esp->current_SC == SCptr) {
esp->cur_msgout[0] = ABORT;
esp->msgout_len = 1;
esp->msgout_ctr = 0;
esp_cmd(esp, eregs, ESP_CMD_SATN);
return SUCCESS;
}
/* If it is still in the issue queue then we can safely
* call the completion routine and report abort success.
*/
don = esp->dma_ports_p(esp);
if(don) {
esp->dma_ints_off(esp);
synchronize_irq(esp->irq);
}
if(esp->issue_SC) {
Scsi_Cmnd **prev, *this;
for(prev = (&esp->issue_SC), this = esp->issue_SC;
this;
prev = (Scsi_Cmnd **) &(this->host_scribble),
this = (Scsi_Cmnd *) this->host_scribble) {
if(this == SCptr) {
*prev = (Scsi_Cmnd *) this->host_scribble;
this->host_scribble = NULL;
esp_release_dmabufs(esp, this);
this->result = DID_ABORT << 16;
this->done(this);
if(don)
esp->dma_ints_on(esp);
return SUCCESS;
}
}
}
/* Yuck, the command to abort is disconnected, it is not
* worth trying to abort it now if something else is live
* on the bus at this time. So, we let the SCSI code wait
* a little bit and try again later.
*/
if(esp->current_SC) {
if(don)
esp->dma_ints_on(esp);
return FAILED;
}
/* It's disconnected, we have to reconnect to re-establish
* the nexus and tell the device to abort. However, we really
* cannot 'reconnect' per se. Don't try to be fancy, just
* indicate failure, which causes our caller to reset the whole
* bus.
*/
if(don)
esp->dma_ints_on(esp);
return FAILED;
}
/* We've sent ESP_CMD_RS to the ESP, the interrupt had just
* arrived indicating the end of the SCSI bus reset. Our job
* is to clean out the command queues and begin re-execution
* of SCSI commands once more.
*/
static int esp_finish_reset(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
Scsi_Cmnd *sp = esp->current_SC;
/* Clean up currently executing command, if any. */
if (sp != NULL) {
esp_release_dmabufs(esp, sp);
sp->result = (DID_RESET << 16);
sp->scsi_done(sp);
esp->current_SC = NULL;
}
/* Clean up disconnected queue, they have been invalidated
* by the bus reset.
*/
if (esp->disconnected_SC) {
while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) {
esp_release_dmabufs(esp, sp);
sp->result = (DID_RESET << 16);
sp->scsi_done(sp);
}
}
/* SCSI bus reset is complete. */
esp->resetting_bus = 0;
wake_up(&esp->reset_queue);
/* Ok, now it is safe to get commands going once more. */
if(esp->issue_SC)
esp_exec_cmd(esp);
return do_intr_end;
}
static int esp_do_resetbus(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id));
esp->resetting_bus = 1;
esp_cmd(esp, eregs, ESP_CMD_RS);
return do_intr_end;
}
/* Reset ESP chip, reset hanging bus, then kill active and
* disconnected commands for targets without soft reset.
*
* The host_lock is acquired by caller.
*/
int esp_reset(Scsi_Cmnd *SCptr)
{
struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata;
spin_lock_irq(esp->ehost->host_lock);
(void) esp_do_resetbus(esp, esp->eregs);
spin_unlock_irq(esp->ehost->host_lock);
wait_event(esp->reset_queue, (esp->resetting_bus == 0));
return SUCCESS;
}
/* Internal ESP done function. */
static void esp_done(struct NCR_ESP *esp, int error)
{
Scsi_Cmnd *done_SC;
if(esp->current_SC) {
done_SC = esp->current_SC;
esp->current_SC = NULL;
esp_release_dmabufs(esp, done_SC);
done_SC->result = error;
done_SC->scsi_done(done_SC);
/* Bus is free, issue any commands in the queue. */
if(esp->issue_SC && !esp->current_SC)
esp_exec_cmd(esp);
} else {
/* Panic is safe as current_SC is null so we may still
* be able to accept more commands to sync disk buffers.
*/
ESPLOG(("panicing\n"));
panic("esp: done() called with NULL esp->current_SC");
}
}
/* Wheee, ESP interrupt engine. */
/* Forward declarations. */
static int esp_do_phase_determine(struct NCR_ESP *esp,
struct ESP_regs *eregs);
static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs);
static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs);
#define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP)
#define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP)
/* We try to avoid some interrupts by jumping ahead and see if the ESP
* has gotten far enough yet. Hence the following.
*/
static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs,
Scsi_Cmnd *scp, int prev_phase, int new_phase)
{
if(scp->SCp.sent_command != prev_phase)
return 0;
if(esp->dma_irq_p(esp)) {
/* Yes, we are able to save an interrupt. */
esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR));
esp->ireg = esp_read(eregs->esp_intrpt);
if(!(esp->ireg & ESP_INTR_SR))
return 0;
else
return do_reset_complete;
}
/* Ho hum, target is taking forever... */
scp->SCp.sent_command = new_phase; /* so we don't recurse... */
return do_intr_end;
}
static inline int skipahead2(struct NCR_ESP *esp,
struct ESP_regs *eregs,
Scsi_Cmnd *scp, int prev_phase1, int prev_phase2,
int new_phase)
{
if(scp->SCp.sent_command != prev_phase1 &&
scp->SCp.sent_command != prev_phase2)
return 0;
if(esp->dma_irq_p(esp)) {
/* Yes, we are able to save an interrupt. */
esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR));
esp->ireg = esp_read(eregs->esp_intrpt);
if(!(esp->ireg & ESP_INTR_SR))
return 0;
else
return do_reset_complete;
}
/* Ho hum, target is taking forever... */
scp->SCp.sent_command = new_phase; /* so we don't recurse... */
return do_intr_end;
}
/* Misc. esp helper macros. */
#define esp_setcount(__eregs, __cnt) \
esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \
esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff))
#define esp_getcount(__eregs) \
((esp_read((__eregs)->esp_tclow)&0xff) | \
((esp_read((__eregs)->esp_tcmed)&0xff) << 8))
#define fcount(__esp, __eregs) \
(esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES)
#define fnzero(__esp, __eregs) \
(esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO)
/* XXX speculative nops unnecessary when continuing amidst a data phase
* XXX even on esp100!!! another case of flooding the bus with I/O reg
* XXX writes...
*/
#define esp_maybe_nop(__esp, __eregs) \
if((__esp)->erev == esp100) \
esp_cmd((__esp), (__eregs), ESP_CMD_NULL)
#define sreg_to_dataphase(__sreg) \
((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain)
/* The ESP100 when in synchronous data phase, can mistake a long final
* REQ pulse from the target as an extra byte, it places whatever is on
* the data lines into the fifo. For now, we will assume when this
* happens that the target is a bit quirky and we don't want to
* be talking synchronously to it anyways. Regardless, we need to
* tell the ESP to eat the extraneous byte so that we can proceed
* to the next phase.
*/
static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs,
Scsi_Cmnd *sp, int fifocnt)
{
/* Do not touch this piece of code. */
if((!(esp->erev == esp100)) ||
(!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) &&
!(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) {
if(sp->SCp.phase == in_dataout)
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
return 0;
} else {
/* Async mode for this guy. */
build_sync_nego_msg(esp, 0, 0);
/* Ack the bogus byte, but set ATN first. */
esp_cmd(esp, eregs, ESP_CMD_SATN);
esp_cmd(esp, eregs, ESP_CMD_MOK);
return 1;
}
}
/* This closes the window during a selection with a reselect pending, because
* we use DMA for the selection process the FIFO should hold the correct
* contents if we get reselected during this process. So we just need to
* ack the possible illegal cmd interrupt pending on the esp100.
*/
static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
volatile unchar junk;
if(esp->erev != esp100)
return 0;
junk = esp_read(eregs->esp_intrpt);
if(junk & ESP_INTR_SR)
return 1;
return 0;
}
/* This verifies the BUSID bits during a reselection so that we know which
* target is talking to us.
*/
static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
int it, me = esp->scsi_id_mask, targ = 0;
if(2 != fcount(esp, eregs))
return -1;
it = esp_read(eregs->esp_fdata);
if(!(it & me))
return -1;
it &= ~me;
if(it & (it - 1))
return -1;
while(!(it & 1))
targ++, it >>= 1;
return targ;
}
/* This verifies the identify from the target so that we know which lun is
* being reconnected.
*/
static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
int lun;
if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP)
return -1;
lun = esp_read(eregs->esp_fdata);
/* Yes, you read this correctly. We report lun of zero
* if we see parity error. ESP reports parity error for
* the lun byte, and this is the only way to hope to recover
* because the target is connected.
*/
if(esp->sreg & ESP_STAT_PERR)
return 0;
/* Check for illegal bits being set in the lun. */
if((lun & 0x40) || !(lun & 0x80))
return -1;
return lun & 7;
}
/* This puts the driver in a state where it can revitalize a command that
* is being continued due to reselection.
*/
static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs,
Scsi_Cmnd *sp)
{
struct scsi_device *dp = sp->device;
struct esp_device *esp_dev = dp->hostdata;
if(esp->prev_soff != esp_dev->sync_max_offset ||
esp->prev_stp != esp_dev->sync_min_period ||
(esp->erev > esp100a &&
esp->prev_cfg3 != esp->config3[scmd_id(sp)])) {
esp->prev_soff = esp_dev->sync_max_offset;
esp_write(eregs->esp_soff, esp->prev_soff);
esp->prev_stp = esp_dev->sync_min_period;
esp_write(eregs->esp_stp, esp->prev_stp);
if(esp->erev > esp100a) {
esp->prev_cfg3 = esp->config3[scmd_id(sp)];
esp_write(eregs->esp_cfg3, esp->prev_cfg3);
}
}
esp->current_SC = sp;
}
/* This will place the current working command back into the issue queue
* if we are to receive a reselection amidst a selection attempt.
*/
static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
if(!esp->disconnected_SC)
ESPLOG(("esp%d: Weird, being reselected but disconnected "
"command queue is empty.\n", esp->esp_id));
esp->snip = 0;
esp->current_SC = NULL;
sp->SCp.phase = not_issued;
append_SC(&esp->issue_SC, sp);
}
/* Begin message in phase. */
static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
esp_maybe_nop(esp, eregs);
esp_cmd(esp, eregs, ESP_CMD_TI);
esp->msgin_len = 1;
esp->msgin_ctr = 0;
esp_advance_phase(esp->current_SC, in_msgindone);
return do_work_bus;
}
static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp)
{
++sp->SCp.buffer;
--sp->SCp.buffers_residual;
sp->SCp.this_residual = sp->SCp.buffer->length;
if (esp->dma_advance_sg)
esp->dma_advance_sg (sp);
else
sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset));
}
/* Please note that the way I've coded these routines is that I _always_
* check for a disconnect during any and all information transfer
* phases. The SCSI standard states that the target _can_ cause a BUS
* FREE condition by dropping all MSG/CD/IO/BSY signals. Also note
* that during information transfer phases the target controls every
* change in phase, the only thing the initiator can do is "ask" for
* a message out phase by driving ATN true. The target can, and sometimes
* will, completely ignore this request so we cannot assume anything when
* we try to force a message out phase to abort/reset a target. Most of
* the time the target will eventually be nice and go to message out, so
* we may have to hold on to our state about what we want to tell the target
* for some period of time.
*/
/* I think I have things working here correctly. Even partial transfers
* within a buffer or sub-buffer should not upset us at all no matter
* how bad the target and/or ESP fucks things up.
*/
static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
int thisphase, hmuch;
ESPDATA(("esp_do_data: "));
esp_maybe_nop(esp, eregs);
thisphase = sreg_to_dataphase(esp->sreg);
esp_advance_phase(SCptr, thisphase);
ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT"));
hmuch = esp->dma_can_transfer(esp, SCptr);
/*
* XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0
*/
if (hmuch) { /* DMA */
/*
* DMA
*/
ESPDATA(("hmuch<%d> ", hmuch));
esp->current_transfer_size = hmuch;
esp_setcount(eregs, (esp->fas_premature_intr_workaround ?
(hmuch + 0x40) : hmuch));
esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr),
hmuch, (thisphase == in_datain));
ESPDATA(("DMA|TI --> do_intr_end\n"));
esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
return do_intr_end;
/*
* end DMA
*/
} else {
/*
* PIO
*/
int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */
int fifocnt = 0;
unsigned char *p = phys_to_virt((unsigned long)SCptr->SCp.ptr);
oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK;
/*
* polled transfer; ugly, can we make this happen in a DRQ
* interrupt handler ??
* requires keeping track of state information in host or
* command struct!
* Problem: I've never seen a DRQ happen on Mac, not even
* with ESP_CMD_DMA ...
*/
/* figure out how much needs to be transferred */
hmuch = SCptr->SCp.this_residual;
ESPDATA(("hmuch<%d> pio ", hmuch));
esp->current_transfer_size = hmuch;
/* tell the ESP ... */
esp_setcount(eregs, hmuch);
/* loop */
while (hmuch) {
int j, fifo_stuck = 0, newphase;
unsigned long timeout;
#if 0
unsigned long flags;
#endif
#if 0
if ( i % 10 )
ESPDATA(("\r"));
else
ESPDATA(( /*"\n"*/ "\r"));
#endif
#if 0
local_irq_save(flags);
#endif
if(thisphase == in_datain) {
/* 'go' ... */
esp_cmd(esp, eregs, ESP_CMD_TI);
/* wait for data */
timeout = 1000000;
while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout)
udelay(2);
if (timeout == 0)
printk("DRQ datain timeout! \n");
newphase = esp->sreg & ESP_STAT_PMASK;
/* see how much we got ... */
fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
if (!fifocnt)
fifo_stuck++;
else
fifo_stuck = 0;
ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase));
/* read fifo */
for(j=0;j<fifocnt;j++)
p[i++] = esp_read(eregs->esp_fdata);
ESPDATA(("(%d) ", i));
/* how many to go ?? */
hmuch -= fifocnt;
/* break if status phase !! */
if(newphase == ESP_STATP) {
/* clear int. */
esp->ireg = esp_read(eregs->esp_intrpt);
break;
}
} else {
#define MAX_FIFO 8
/* how much will fit ? */
int this_count = MAX_FIFO - fifocnt;
if (this_count > hmuch)
this_count = hmuch;
/* fill fifo */
for(j=0;j<this_count;j++)
esp_write(eregs->esp_fdata, p[i++]);
/* how many left if this goes out ?? */
hmuch -= this_count;
/* 'go' ... */
esp_cmd(esp, eregs, ESP_CMD_TI);
/* wait for 'got it' */
timeout = 1000000;
while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout)
udelay(2);
if (timeout == 0)
printk("DRQ dataout timeout! \n");
newphase = esp->sreg & ESP_STAT_PMASK;
/* need to check how much was sent ?? */
fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase));
ESPDATA(("(%d) ", i));
/* break if status phase !! */
if(newphase == ESP_STATP) {
/* clear int. */
esp->ireg = esp_read(eregs->esp_intrpt);
break;
}
}
/* clear int. */
esp->ireg = esp_read(eregs->esp_intrpt);
ESPDATA(("ir %x ... ", esp->ireg));
if (hmuch == 0)
ESPDATA(("done! \n"));
#if 0
local_irq_restore(flags);
#endif
/* check new bus phase */
if (newphase != oldphase && i < esp->current_transfer_size) {
/* something happened; disconnect ?? */
ESPDATA(("phase change, dropped out with %d done ... ", i));
break;
}
/* check int. status */
if (esp->ireg & ESP_INTR_DC) {
/* disconnect */
ESPDATA(("disconnect; %d transferred ... ", i));
break;
} else if (esp->ireg & ESP_INTR_FDONE) {
/* function done */
ESPDATA(("function done; %d transferred ... ", i));
break;
}
/* XXX fixme: bail out on stall */
if (fifo_stuck > 10) {
/* we're stuck */
ESPDATA(("fifo stall; %d transferred ... ", i));
break;
}
}
ESPDATA(("\n"));
/* check successful completion ?? */
if (thisphase == in_dataout)
hmuch += fifocnt; /* stuck?? adjust data pointer ...*/
/* tell do_data_finale how much was transferred */
esp->current_transfer_size -= hmuch;
/* still not completely sure on this one ... */
return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ;
/*
* end PIO
*/
}
return do_intr_end;
}
/* See how successful the data transfer was. */
static int esp_do_data_finale(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
struct esp_device *esp_dev = SCptr->device->hostdata;
int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0;
if(esp->dma_led_off)
esp->dma_led_off(esp);
ESPDATA(("esp_do_data_finale: "));
if(SCptr->SCp.phase == in_datain) {
if(esp->sreg & ESP_STAT_PERR) {
/* Yuck, parity error. The ESP asserts ATN
* so that we can go to message out phase
* immediately and inform the target that
* something bad happened.
*/
ESPLOG(("esp%d: data bad parity detected.\n",
esp->esp_id));
esp->cur_msgout[0] = INITIATOR_ERROR;
esp->msgout_len = 1;
}
if(esp->dma_drain)
esp->dma_drain(esp);
}
if(esp->dma_invalidate)
esp->dma_invalidate(esp);
/* This could happen for the above parity error case. */
if(!(esp->ireg == ESP_INTR_BSERV)) {
/* Please go to msgout phase, please please please... */
ESPLOG(("esp%d: !BSERV after data, probably to msgout\n",
esp->esp_id));
return esp_do_phase_determine(esp, eregs);
}
/* Check for partial transfers and other horrible events. */
fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
ecount = esp_getcount(eregs);
if(esp->fas_premature_intr_workaround)
ecount -= 0x40;
bytes_sent = esp->current_transfer_size;
ESPDATA(("trans_sz=%d, ", bytes_sent));
if(!(esp->sreg & ESP_STAT_TCNT))
bytes_sent -= ecount;
if(SCptr->SCp.phase == in_dataout)
bytes_sent -= fifocnt;
ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent,
ecount, fifocnt));
/* If we were in synchronous mode, check for peculiarities. */
if(esp_dev->sync_max_offset)
bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt);
else
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
/* Until we are sure of what has happened, we are certainly
* in the dark.
*/
esp_advance_phase(SCptr, in_the_dark);
/* Check for premature interrupt condition. Can happen on FAS2x6
* chips. QLogic recommends a workaround by overprogramming the
* transfer counters, but this makes doing scatter-gather impossible.
* Until there is a way to disable scatter-gather for a single target,
* and not only for the entire host adapter as it is now, the workaround
* is way to expensive performance wise.
* Instead, it turns out that when this happens the target has disconnected
* already but it doesn't show in the interrupt register. Compensate for
* that here to try and avoid a SCSI bus reset.
*/
if(!esp->fas_premature_intr_workaround && (fifocnt == 1) &&
sreg_dataoutp(esp->sreg)) {
ESPLOG(("esp%d: Premature interrupt, enabling workaround\n",
esp->esp_id));
#if 0
/* Disable scatter-gather operations, they are not possible
* when using this workaround.
*/
esp->ehost->sg_tablesize = 0;
esp->ehost->use_clustering = ENABLE_CLUSTERING;
esp->fas_premature_intr_workaround = 1;
bytes_sent = 0;
if(SCptr->use_sg) {
ESPLOG(("esp%d: Aborting scatter-gather operation\n",
esp->esp_id));
esp->cur_msgout[0] = ABORT;
esp->msgout_len = 1;
esp->msgout_ctr = 0;
esp_cmd(esp, eregs, ESP_CMD_SATN);
esp_setcount(eregs, 0xffff);
esp_cmd(esp, eregs, ESP_CMD_NULL);
esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA);
return do_intr_end;
}
#else
/* Just set the disconnected bit. That's what appears to
* happen anyway. The state machine will pick it up when
* we return.
*/
esp->ireg |= ESP_INTR_DC;
#endif
}
if(bytes_sent < 0) {
/* I've seen this happen due to lost state in this
* driver. No idea why it happened, but allowing
* this value to be negative caused things to
* lock up. This allows greater chance of recovery.
* In fact every time I've seen this, it has been
* a driver bug without question.
*/
ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id));
ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n",
esp->esp_id,
esp->current_transfer_size, fifocnt, ecount));
ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n",
esp->esp_id,
SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual));
ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id,
SCptr->device->id));
SCptr->device->borken = 1;
esp_dev->sync = 0;
bytes_sent = 0;
}
/* Update the state of our transfer. */
SCptr->SCp.ptr += bytes_sent;
SCptr->SCp.this_residual -= bytes_sent;
if(SCptr->SCp.this_residual < 0) {
/* shit */
ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id));
SCptr->SCp.this_residual = 0;
}
/* Maybe continue. */
if(!bogus_data) {
ESPDATA(("!bogus_data, "));
/* NO MATTER WHAT, we advance the scatterlist,
* if the target should decide to disconnect
* in between scatter chunks (which is common)
* we could die horribly! I used to have the sg
* advance occur only if we are going back into
* (or are staying in) a data phase, you can
* imagine the hell I went through trying to
* figure this out.
*/
if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual)
advance_sg(esp, SCptr);
#ifdef DEBUG_ESP_DATA
if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) {
ESPDATA(("to more data\n"));
} else {
ESPDATA(("to new phase\n"));
}
#endif
return esp_do_phase_determine(esp, eregs);
}
/* Bogus data, just wait for next interrupt. */
ESPLOG(("esp%d: bogus_data during end of data phase\n",
esp->esp_id));
return do_intr_end;
}
/* We received a non-good status return at the end of
* running a SCSI command. This is used to decide if
* we should clear our synchronous transfer state for
* such a device when that happens.
*
* The idea is that when spinning up a disk or rewinding
* a tape, we don't want to go into a loop re-negotiating
* synchronous capabilities over and over.
*/
static int esp_should_clear_sync(Scsi_Cmnd *sp)
{
unchar cmd = sp->cmnd[0];
/* These cases are for spinning up a disk and
* waiting for that spinup to complete.
*/
if(cmd == START_STOP)
return 0;
if(cmd == TEST_UNIT_READY)
return 0;
/* One more special case for SCSI tape drives,
* this is what is used to probe the device for
* completion of a rewind or tape load operation.
*/
if(sp->device->type == TYPE_TAPE && cmd == MODE_SENSE)
return 0;
return 1;
}
/* Either a command is completing or a target is dropping off the bus
* to continue the command in the background so we can do other work.
*/
static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
int rval;
rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing);
if(rval)
return rval;
if(esp->ireg != ESP_INTR_DC) {
ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id));
return do_reset_bus; /* target will not drop BSY... */
}
esp->msgout_len = 0;
esp->prevmsgout = NOP;
if(esp->prevmsgin == COMMAND_COMPLETE) {
struct esp_device *esp_dev = SCptr->device->hostdata;
/* Normal end of nexus. */
if(esp->disconnected_SC)
esp_cmd(esp, eregs, ESP_CMD_ESEL);
if(SCptr->SCp.Status != GOOD &&
SCptr->SCp.Status != CONDITION_GOOD &&
((1<<scmd_id(SCptr)) & esp->targets_present) &&
esp_dev->sync && esp_dev->sync_max_offset) {
/* SCSI standard says that the synchronous capabilities
* should be renegotiated at this point. Most likely
* we are about to request sense from this target
* in which case we want to avoid using sync
* transfers until we are sure of the current target
* state.
*/
ESPMISC(("esp: Status <%d> for target %d lun %d\n",
SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun));
/* But don't do this when spinning up a disk at
* boot time while we poll for completion as it
* fills up the console with messages. Also, tapes
* can report not ready many times right after
* loading up a tape.
*/
if(esp_should_clear_sync(SCptr) != 0)
esp_dev->sync = 0;
}
ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
esp_done(esp, ((SCptr->SCp.Status & 0xff) |
((SCptr->SCp.Message & 0xff)<<8) |
(DID_OK << 16)));
} else if(esp->prevmsgin == DISCONNECT) {
/* Normal disconnect. */
esp_cmd(esp, eregs, ESP_CMD_ESEL);
ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun));
append_SC(&esp->disconnected_SC, SCptr);
esp->current_SC = NULL;
if(esp->issue_SC)
esp_exec_cmd(esp);
} else {
/* Driver bug, we do not expect a disconnect here
* and should not have advanced the state engine
* to in_freeing.
*/
ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n",
esp->esp_id));
return do_reset_bus;
}
return do_intr_end;
}
/* When a reselect occurs, and we cannot find the command to
* reconnect to in our queues, we do this.
*/
static int esp_bad_reconnect(struct NCR_ESP *esp)
{
Scsi_Cmnd *sp;
ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n",
esp->esp_id));
ESPLOG(("QUEUE DUMP\n"));
sp = esp->issue_SC;
ESPLOG(("esp%d: issue_SC[", esp->esp_id));
while(sp) {
ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
sp = (Scsi_Cmnd *) sp->host_scribble;
}
ESPLOG(("]\n"));
sp = esp->current_SC;
ESPLOG(("esp%d: current_SC[", esp->esp_id));
while(sp) {
ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
sp = (Scsi_Cmnd *) sp->host_scribble;
}
ESPLOG(("]\n"));
sp = esp->disconnected_SC;
ESPLOG(("esp%d: disconnected_SC[", esp->esp_id));
while(sp) {
ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun));
sp = (Scsi_Cmnd *) sp->host_scribble;
}
ESPLOG(("]\n"));
return do_reset_bus;
}
/* Do the needy when a target tries to reconnect to us. */
static int esp_do_reconnect(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
int lun, target;
Scsi_Cmnd *SCptr;
/* Check for all bogus conditions first. */
target = reconnect_target(esp, eregs);
if(target < 0) {
ESPDISC(("bad bus bits\n"));
return do_reset_bus;
}
lun = reconnect_lun(esp, eregs);
if(lun < 0) {
ESPDISC(("target=%2x, bad identify msg\n", target));
return do_reset_bus;
}
/* Things look ok... */
ESPDISC(("R<%02x,%02x>", target, lun));
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
if(esp100_reconnect_hwbug(esp, eregs))
return do_reset_bus;
esp_cmd(esp, eregs, ESP_CMD_NULL);
SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun);
if(!SCptr)
return esp_bad_reconnect(esp);
esp_connect(esp, eregs, SCptr);
esp_cmd(esp, eregs, ESP_CMD_MOK);
/* Reconnect implies a restore pointers operation. */
esp_restore_pointers(esp, SCptr);
esp->snip = 0;
esp_advance_phase(SCptr, in_the_dark);
return do_intr_end;
}
/* End of NEXUS (hopefully), pick up status + message byte then leave if
* all goes well.
*/
static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
int intr, rval;
rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status);
if(rval)
return rval;
intr = esp->ireg;
ESPSTAT(("esp_do_status: "));
if(intr != ESP_INTR_DC) {
int message_out = 0; /* for parity problems */
/* Ack the message. */
ESPSTAT(("ack msg, "));
esp_cmd(esp, eregs, ESP_CMD_MOK);
if(esp->dma_poll)
esp->dma_poll(esp, (unsigned char *) esp->esp_command);
ESPSTAT(("got something, "));
/* ESP chimes in with one of
*
* 1) function done interrupt:
* both status and message in bytes
* are available
*
* 2) bus service interrupt:
* only status byte was acquired
*
* 3) Anything else:
* can't happen, but we test for it
* anyways
*
* ALSO: If bad parity was detected on either
* the status _or_ the message byte then
* the ESP has asserted ATN on the bus
* and we must therefore wait for the
* next phase change.
*/
if(intr & ESP_INTR_FDONE) {
/* We got it all, hallejulia. */
ESPSTAT(("got both, "));
SCptr->SCp.Status = esp->esp_command[0];
SCptr->SCp.Message = esp->esp_command[1];
esp->prevmsgin = SCptr->SCp.Message;
esp->cur_msgin[0] = SCptr->SCp.Message;
if(esp->sreg & ESP_STAT_PERR) {
/* There was bad parity for the
* message byte, the status byte
* was ok.
*/
message_out = MSG_PARITY_ERROR;
}
} else if(intr == ESP_INTR_BSERV) {
/* Only got status byte. */
ESPLOG(("esp%d: got status only, ", esp->esp_id));
if(!(esp->sreg & ESP_STAT_PERR)) {
SCptr->SCp.Status = esp->esp_command[0];
SCptr->SCp.Message = 0xff;
} else {
/* The status byte had bad parity.
* we leave the scsi_pointer Status
* field alone as we set it to a default
* of CHECK_CONDITION in esp_queue.
*/
message_out = INITIATOR_ERROR;
}
} else {
/* This shouldn't happen ever. */
ESPSTAT(("got bolixed\n"));
esp_advance_phase(SCptr, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
if(!message_out) {
ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status,
SCptr->SCp.Message));
if(SCptr->SCp.Message == COMMAND_COMPLETE) {
ESPSTAT(("and was COMMAND_COMPLETE\n"));
esp_advance_phase(SCptr, in_freeing);
return esp_do_freebus(esp, eregs);
} else {
ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n",
esp->esp_id));
esp->msgin_len = esp->msgin_ctr = 1;
esp_advance_phase(SCptr, in_msgindone);
return esp_do_msgindone(esp, eregs);
}
} else {
/* With luck we'll be able to let the target
* know that bad parity happened, it will know
* which byte caused the problems and send it
* again. For the case where the status byte
* receives bad parity, I do not believe most
* targets recover very well. We'll see.
*/
ESPLOG(("esp%d: bad parity somewhere mout=%2x\n",
esp->esp_id, message_out));
esp->cur_msgout[0] = message_out;
esp->msgout_len = esp->msgout_ctr = 1;
esp_advance_phase(SCptr, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
} else {
/* If we disconnect now, all hell breaks loose. */
ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id));
esp_advance_phase(SCptr, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
}
static int esp_enter_status(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
unchar thecmd = ESP_CMD_ICCSEQ;
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
if(esp->do_pio_cmds) {
esp_advance_phase(esp->current_SC, in_status);
esp_cmd(esp, eregs, thecmd);
while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR));
esp->esp_command[0] = esp_read(eregs->esp_fdata);
while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR));
esp->esp_command[1] = esp_read(eregs->esp_fdata);
} else {
esp->esp_command[0] = esp->esp_command[1] = 0xff;
esp_write(eregs->esp_tclow, 2);
esp_write(eregs->esp_tcmed, 0);
esp->dma_init_read(esp, esp->esp_command_dvma, 2);
thecmd |= ESP_CMD_DMA;
esp_cmd(esp, eregs, thecmd);
esp_advance_phase(esp->current_SC, in_status);
}
return esp_do_status(esp, eregs);
}
static int esp_disconnect_amidst_phases(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
Scsi_Cmnd *sp = esp->current_SC;
struct esp_device *esp_dev = sp->device->hostdata;
/* This means real problems if we see this
* here. Unless we were actually trying
* to force the device to abort/reset.
*/
ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id));
ESPLOG(("pphase<%s> cphase<%s>, ",
phase_string(sp->SCp.phase),
phase_string(sp->SCp.sent_command)));
if(esp->disconnected_SC)
esp_cmd(esp, eregs, ESP_CMD_ESEL);
switch(esp->cur_msgout[0]) {
default:
/* We didn't expect this to happen at all. */
ESPLOG(("device is bolixed\n"));
esp_advance_phase(sp, in_tgterror);
esp_done(esp, (DID_ERROR << 16));
break;
case BUS_DEVICE_RESET:
ESPLOG(("device reset successful\n"));
esp_dev->sync_max_offset = 0;
esp_dev->sync_min_period = 0;
esp_dev->sync = 0;
esp_advance_phase(sp, in_resetdev);
esp_done(esp, (DID_RESET << 16));
break;
case ABORT:
ESPLOG(("device abort successful\n"));
esp_advance_phase(sp, in_abortone);
esp_done(esp, (DID_ABORT << 16));
break;
};
return do_intr_end;
}
static int esp_enter_msgout(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
esp_advance_phase(esp->current_SC, in_msgout);
return esp_do_msgout(esp, eregs);
}
static int esp_enter_msgin(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
esp_advance_phase(esp->current_SC, in_msgin);
return esp_do_msgin(esp, eregs);
}
static int esp_enter_cmd(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
esp_advance_phase(esp->current_SC, in_cmdbegin);
return esp_do_cmdbegin(esp, eregs);
}
static int esp_enter_badphase(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id,
esp->sreg & ESP_STAT_PMASK));
return do_reset_bus;
}
typedef int (*espfunc_t)(struct NCR_ESP *,
struct ESP_regs *);
static espfunc_t phase_vector[] = {
esp_do_data, /* ESP_DOP */
esp_do_data, /* ESP_DIP */
esp_enter_cmd, /* ESP_CMDP */
esp_enter_status, /* ESP_STATP */
esp_enter_badphase, /* ESP_STAT_PMSG */
esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */
esp_enter_msgout, /* ESP_MOP */
esp_enter_msgin, /* ESP_MIP */
};
/* The target has control of the bus and we have to see where it has
* taken us.
*/
static int esp_do_phase_determine(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
if ((esp->ireg & ESP_INTR_DC) != 0)
return esp_disconnect_amidst_phases(esp, eregs);
return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs);
}
/* First interrupt after exec'ing a cmd comes here. */
static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
struct esp_device *esp_dev = SCptr->device->hostdata;
int cmd_bytes_sent, fcnt;
fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES);
cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt);
if(esp->dma_invalidate)
esp->dma_invalidate(esp);
/* Let's check to see if a reselect happened
* while we we're trying to select. This must
* be checked first.
*/
if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) {
esp_reconnect(esp, SCptr);
return esp_do_reconnect(esp, eregs);
}
/* Looks like things worked, we should see a bus service &
* a function complete interrupt at this point. Note we
* are doing a direct comparison because we don't want to
* be fooled into thinking selection was successful if
* ESP_INTR_DC is set, see below.
*/
if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) {
/* target speaks... */
esp->targets_present |= (1<<scmd_id(SCptr));
/* What if the target ignores the sdtr? */
if(esp->snip)
esp_dev->sync = 1;
/* See how far, if at all, we got in getting
* the information out to the target.
*/
switch(esp->seqreg) {
default:
case ESP_STEP_ASEL:
/* Arbitration won, target selected, but
* we are in some phase which is not command
* phase nor is it message out phase.
*
* XXX We've confused the target, obviously.
* XXX So clear it's state, but we also end
* XXX up clearing everyone elses. That isn't
* XXX so nice. I'd like to just reset this
* XXX target, but if I cannot even get it's
* XXX attention and finish selection to talk
* XXX to it, there is not much more I can do.
* XXX If we have a loaded bus we're going to
* XXX spend the next second or so renegotiating
* XXX for synchronous transfers.
*/
ESPLOG(("esp%d: STEP_ASEL for tgt %d\n",
esp->esp_id, SCptr->device->id));
case ESP_STEP_SID:
/* Arbitration won, target selected, went
* to message out phase, sent one message
* byte, then we stopped. ATN is asserted
* on the SCSI bus and the target is still
* there hanging on. This is a legal
* sequence step if we gave the ESP a select
* and stop command.
*
* XXX See above, I could set the borken flag
* XXX in the device struct and retry the
* XXX command. But would that help for
* XXX tagged capable targets?
*/
case ESP_STEP_NCMD:
/* Arbitration won, target selected, maybe
* sent the one message byte in message out
* phase, but we did not go to command phase
* in the end. Actually, we could have sent
* only some of the message bytes if we tried
* to send out the entire identify and tag
* message using ESP_CMD_SA3.
*/
cmd_bytes_sent = 0;
break;
case ESP_STEP_PPC:
/* No, not the powerPC pinhead. Arbitration
* won, all message bytes sent if we went to
* message out phase, went to command phase
* but only part of the command was sent.
*
* XXX I've seen this, but usually in conjunction
* XXX with a gross error which appears to have
* XXX occurred between the time I told the
* XXX ESP to arbitrate and when I got the
* XXX interrupt. Could I have misloaded the
* XXX command bytes into the fifo? Actually,
* XXX I most likely missed a phase, and therefore
* XXX went into never never land and didn't even
* XXX know it. That was the old driver though.
* XXX What is even more peculiar is that the ESP
* XXX showed the proper function complete and
* XXX bus service bits in the interrupt register.
*/
case ESP_STEP_FINI4:
case ESP_STEP_FINI5:
case ESP_STEP_FINI6:
case ESP_STEP_FINI7:
/* Account for the identify message */
if(SCptr->SCp.phase == in_slct_norm)
cmd_bytes_sent -= 1;
};
esp_cmd(esp, eregs, ESP_CMD_NULL);
/* Be careful, we could really get fucked during synchronous
* data transfers if we try to flush the fifo now.
*/
if(!fcnt && /* Fifo is empty and... */
/* either we are not doing synchronous transfers or... */
(!esp_dev->sync_max_offset ||
/* We are not going into data in phase. */
((esp->sreg & ESP_STAT_PMASK) != ESP_DIP)))
esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */
/* See how far we got if this is not a slow command. */
if(!esp->esp_slowcmd) {
if(cmd_bytes_sent < 0)
cmd_bytes_sent = 0;
if(cmd_bytes_sent != SCptr->cmd_len) {
/* Crapola, mark it as a slowcmd
* so that we have some chance of
* keeping the command alive with
* good luck.
*
* XXX Actually, if we didn't send it all
* XXX this means either we didn't set things
* XXX up properly (driver bug) or the target
* XXX or the ESP detected parity on one of
* XXX the command bytes. This makes much
* XXX more sense, and therefore this code
* XXX should be changed to send out a
* XXX parity error message or if the status
* XXX register shows no parity error then
* XXX just expect the target to bring the
* XXX bus into message in phase so that it
* XXX can send us the parity error message.
* XXX SCSI sucks...
*/
esp->esp_slowcmd = 1;
esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]);
esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent);
}
}
/* Now figure out where we went. */
esp_advance_phase(SCptr, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
/* Did the target even make it? */
if(esp->ireg == ESP_INTR_DC) {
/* wheee... nobody there or they didn't like
* what we told it to do, clean up.
*/
/* If anyone is off the bus, but working on
* a command in the background for us, tell
* the ESP to listen for them.
*/
if(esp->disconnected_SC)
esp_cmd(esp, eregs, ESP_CMD_ESEL);
if(((1<<SCptr->device->id) & esp->targets_present) &&
esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE &&
(SCptr->SCp.phase == in_slct_msg ||
SCptr->SCp.phase == in_slct_stop)) {
/* shit */
esp->snip = 0;
ESPLOG(("esp%d: Failed synchronous negotiation for target %d "
"lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun));
esp_dev->sync_max_offset = 0;
esp_dev->sync_min_period = 0;
esp_dev->sync = 1; /* so we don't negotiate again */
/* Run the command again, this time though we
* won't try to negotiate for synchronous transfers.
*
* XXX I'd like to do something like send an
* XXX INITIATOR_ERROR or ABORT message to the
* XXX target to tell it, "Sorry I confused you,
* XXX please come back and I will be nicer next
* XXX time". But that requires having the target
* XXX on the bus, and it has dropped BSY on us.
*/
esp->current_SC = NULL;
esp_advance_phase(SCptr, not_issued);
prepend_SC(&esp->issue_SC, SCptr);
esp_exec_cmd(esp);
return do_intr_end;
}
/* Ok, this is normal, this is what we see during boot
* or whenever when we are scanning the bus for targets.
* But first make sure that is really what is happening.
*/
if(((1<<SCptr->device->id) & esp->targets_present)) {
ESPLOG(("esp%d: Warning, live target %d not responding to "
"selection.\n", esp->esp_id, SCptr->device->id));
/* This _CAN_ happen. The SCSI standard states that
* the target is to _not_ respond to selection if
* _it_ detects bad parity on the bus for any reason.
* Therefore, we assume that if we've talked successfully
* to this target before, bad parity is the problem.
*/
esp_done(esp, (DID_PARITY << 16));
} else {
/* Else, there really isn't anyone there. */
ESPMISC(("esp: selection failure, maybe nobody there?\n"));
ESPMISC(("esp: target %d lun %d\n",
SCptr->device->id, SCptr->device->lun));
esp_done(esp, (DID_BAD_TARGET << 16));
}
return do_intr_end;
}
ESPLOG(("esp%d: Selection failure.\n", esp->esp_id));
printk("esp%d: Currently -- ", esp->esp_id);
esp_print_ireg(esp->ireg);
printk(" ");
esp_print_statreg(esp->sreg);
printk(" ");
esp_print_seqreg(esp->seqreg);
printk("\n");
printk("esp%d: New -- ", esp->esp_id);
esp->sreg = esp_read(eregs->esp_status);
esp->seqreg = esp_read(eregs->esp_sstep);
esp->ireg = esp_read(eregs->esp_intrpt);
esp_print_ireg(esp->ireg);
printk(" ");
esp_print_statreg(esp->sreg);
printk(" ");
esp_print_seqreg(esp->seqreg);
printk("\n");
ESPLOG(("esp%d: resetting bus\n", esp->esp_id));
return do_reset_bus; /* ugh... */
}
/* Continue reading bytes for msgin phase. */
static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
if(esp->ireg & ESP_INTR_BSERV) {
/* in the right phase too? */
if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) {
/* phew... */
esp_cmd(esp, eregs, ESP_CMD_TI);
esp_advance_phase(esp->current_SC, in_msgindone);
return do_intr_end;
}
/* We changed phase but ESP shows bus service,
* in this case it is most likely that we, the
* hacker who has been up for 20hrs straight
* staring at the screen, drowned in coffee
* smelling like retched cigarette ashes
* have miscoded something..... so, try to
* recover as best we can.
*/
ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id));
}
esp_advance_phase(esp->current_SC, in_the_dark);
return do_phase_determine;
}
static int check_singlebyte_msg(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
esp->prevmsgin = esp->cur_msgin[0];
if(esp->cur_msgin[0] & 0x80) {
/* wheee... */
ESPLOG(("esp%d: target sends identify amidst phases\n",
esp->esp_id));
esp_advance_phase(esp->current_SC, in_the_dark);
return 0;
} else if(((esp->cur_msgin[0] & 0xf0) == 0x20) ||
(esp->cur_msgin[0] == EXTENDED_MESSAGE)) {
esp->msgin_len = 2;
esp_advance_phase(esp->current_SC, in_msgincont);
return 0;
}
esp_advance_phase(esp->current_SC, in_the_dark);
switch(esp->cur_msgin[0]) {
default:
/* We don't want to hear about it. */
ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id,
esp->cur_msgin[0]));
return MESSAGE_REJECT;
case NOP:
ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id,
esp->current_SC->device->id));
return 0;
case RESTORE_POINTERS:
/* In this case we might also have to backup the
* "slow command" pointer. It is rare to get such
* a save/restore pointer sequence so early in the
* bus transition sequences, but cover it.
*/
if(esp->esp_slowcmd) {
esp->esp_scmdleft = esp->current_SC->cmd_len;
esp->esp_scmdp = &esp->current_SC->cmnd[0];
}
esp_restore_pointers(esp, esp->current_SC);
return 0;
case SAVE_POINTERS:
esp_save_pointers(esp, esp->current_SC);
return 0;
case COMMAND_COMPLETE:
case DISCONNECT:
/* Freeing the bus, let it go. */
esp->current_SC->SCp.phase = in_freeing;
return 0;
case MESSAGE_REJECT:
ESPMISC(("msg reject, "));
if(esp->prevmsgout == EXTENDED_MESSAGE) {
struct esp_device *esp_dev = esp->current_SC->device->hostdata;
/* Doesn't look like this target can
* do synchronous or WIDE transfers.
*/
ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n"));
esp_dev->sync = 1;
esp_dev->wide = 1;
esp_dev->sync_min_period = 0;
esp_dev->sync_max_offset = 0;
return 0;
} else {
ESPMISC(("not sync nego, sending ABORT\n"));
return ABORT;
}
};
}
/* Target negotiates for synchronous transfers before we do, this
* is legal although very strange. What is even funnier is that
* the SCSI2 standard specifically recommends against targets doing
* this because so many initiators cannot cope with this occurring.
*/
static int target_with_ants_in_pants(struct NCR_ESP *esp,
Scsi_Cmnd *SCptr,
struct esp_device *esp_dev)
{
if(esp_dev->sync || SCptr->device->borken) {
/* sorry, no can do */
ESPSDTR(("forcing to async, "));
build_sync_nego_msg(esp, 0, 0);
esp_dev->sync = 1;
esp->snip = 1;
ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id));
esp_advance_phase(SCptr, in_the_dark);
return EXTENDED_MESSAGE;
}
/* Ok, we'll check them out... */
return 0;
}
static void sync_report(struct NCR_ESP *esp)
{
int msg3, msg4;
char *type;
msg3 = esp->cur_msgin[3];
msg4 = esp->cur_msgin[4];
if(msg4) {
int hz = 1000000000 / (msg3 * 4);
int integer = hz / 1000000;
int fraction = (hz - (integer * 1000000)) / 10000;
if((msg3 * 4) < 200) {
type = "FAST";
} else {
type = "synchronous";
}
/* Do not transform this back into one big printk
* again, it triggers a bug in our sparc64-gcc272
* sibling call optimization. -DaveM
*/
ESPLOG((KERN_INFO "esp%d: target %d ",
esp->esp_id, esp->current_SC->device->id));
ESPLOG(("[period %dns offset %d %d.%02dMHz ",
(int) msg3 * 4, (int) msg4,
integer, fraction));
ESPLOG(("%s SCSI%s]\n", type,
(((msg3 * 4) < 200) ? "-II" : "")));
} else {
ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n",
esp->esp_id, esp->current_SC->device->id));
}
}
static int check_multibyte_msg(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
struct esp_device *esp_dev = SCptr->device->hostdata;
unchar regval = 0;
int message_out = 0;
ESPSDTR(("chk multibyte msg: "));
if(esp->cur_msgin[2] == EXTENDED_SDTR) {
int period = esp->cur_msgin[3];
int offset = esp->cur_msgin[4];
ESPSDTR(("is sync nego response, "));
if(!esp->snip) {
int rval;
/* Target negotiates first! */
ESPSDTR(("target jumps the gun, "));
message_out = EXTENDED_MESSAGE; /* we must respond */
rval = target_with_ants_in_pants(esp, SCptr, esp_dev);
if(rval)
return rval;
}
ESPSDTR(("examining sdtr, "));
/* Offset cannot be larger than ESP fifo size. */
if(offset > 15) {
ESPSDTR(("offset too big %2x, ", offset));
offset = 15;
ESPSDTR(("sending back new offset\n"));
build_sync_nego_msg(esp, period, offset);
return EXTENDED_MESSAGE;
}
if(offset && period > esp->max_period) {
/* Yeee, async for this slow device. */
ESPSDTR(("period too long %2x, ", period));
build_sync_nego_msg(esp, 0, 0);
ESPSDTR(("hoping for msgout\n"));
esp_advance_phase(esp->current_SC, in_the_dark);
return EXTENDED_MESSAGE;
} else if (offset && period < esp->min_period) {
ESPSDTR(("period too short %2x, ", period));
period = esp->min_period;
if(esp->erev > esp236)
regval = 4;
else
regval = 5;
} else if(offset) {
int tmp;
ESPSDTR(("period is ok, "));
tmp = esp->ccycle / 1000;
regval = (((period << 2) + tmp - 1) / tmp);
if(regval && (esp->erev > esp236)) {
if(period >= 50)
regval--;
}
}
if(offset) {
unchar bit;
esp_dev->sync_min_period = (regval & 0x1f);
esp_dev->sync_max_offset = (offset | esp->radelay);
if(esp->erev > esp236) {
if(esp->erev == fas100a)
bit = ESP_CONFIG3_FAST;
else
bit = ESP_CONFIG3_FSCSI;
if(period < 50)
esp->config3[SCptr->device->id] |= bit;
else
esp->config3[SCptr->device->id] &= ~bit;
esp->prev_cfg3 = esp->config3[SCptr->device->id];
esp_write(eregs->esp_cfg3, esp->prev_cfg3);
}
esp->prev_soff = esp_dev->sync_min_period;
esp_write(eregs->esp_soff, esp->prev_soff);
esp->prev_stp = esp_dev->sync_max_offset;
esp_write(eregs->esp_stp, esp->prev_stp);
ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n",
esp_dev->sync_max_offset,
esp_dev->sync_min_period,
esp->config3[scmd_id(SCptr)]));
esp->snip = 0;
} else if(esp_dev->sync_max_offset) {
unchar bit;
/* back to async mode */
ESPSDTR(("unaccaptable sync nego, forcing async\n"));
esp_dev->sync_max_offset = 0;
esp_dev->sync_min_period = 0;
esp->prev_soff = 0;
esp_write(eregs->esp_soff, 0);
esp->prev_stp = 0;
esp_write(eregs->esp_stp, 0);
if(esp->erev > esp236) {
if(esp->erev == fas100a)
bit = ESP_CONFIG3_FAST;
else
bit = ESP_CONFIG3_FSCSI;
esp->config3[SCptr->device->id] &= ~bit;
esp->prev_cfg3 = esp->config3[SCptr->device->id];
esp_write(eregs->esp_cfg3, esp->prev_cfg3);
}
}
sync_report(esp);
ESPSDTR(("chk multibyte msg: sync is known, "));
esp_dev->sync = 1;
if(message_out) {
ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n",
esp->esp_id));
build_sync_nego_msg(esp, period, offset);
esp_advance_phase(SCptr, in_the_dark);
return EXTENDED_MESSAGE;
}
ESPSDTR(("returning zero\n"));
esp_advance_phase(SCptr, in_the_dark); /* ...or else! */
return 0;
} else if(esp->cur_msgin[2] == EXTENDED_WDTR) {
ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id));
message_out = MESSAGE_REJECT;
} else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) {
ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id));
message_out = MESSAGE_REJECT;
}
esp_advance_phase(SCptr, in_the_dark);
return message_out;
}
static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
int message_out = 0, it = 0, rval;
rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone);
if(rval)
return rval;
if(SCptr->SCp.sent_command != in_status) {
if(!(esp->ireg & ESP_INTR_DC)) {
if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) {
message_out = MSG_PARITY_ERROR;
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
} else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) {
/* We certainly dropped the ball somewhere. */
message_out = INITIATOR_ERROR;
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
} else if(!esp->msgin_len) {
it = esp_read(eregs->esp_fdata);
esp_advance_phase(SCptr, in_msgincont);
} else {
/* it is ok and we want it */
it = esp->cur_msgin[esp->msgin_ctr] =
esp_read(eregs->esp_fdata);
esp->msgin_ctr++;
}
} else {
esp_advance_phase(SCptr, in_the_dark);
return do_work_bus;
}
} else {
it = esp->cur_msgin[0];
}
if(!message_out && esp->msgin_len) {
if(esp->msgin_ctr < esp->msgin_len) {
esp_advance_phase(SCptr, in_msgincont);
} else if(esp->msgin_len == 1) {
message_out = check_singlebyte_msg(esp, eregs);
} else if(esp->msgin_len == 2) {
if(esp->cur_msgin[0] == EXTENDED_MESSAGE) {
if((it+2) >= 15) {
message_out = MESSAGE_REJECT;
} else {
esp->msgin_len = (it + 2);
esp_advance_phase(SCptr, in_msgincont);
}
} else {
message_out = MESSAGE_REJECT; /* foo on you */
}
} else {
message_out = check_multibyte_msg(esp, eregs);
}
}
if(message_out < 0) {
return -message_out;
} else if(message_out) {
if(((message_out != 1) &&
((message_out < 0x20) || (message_out & 0x80))))
esp->msgout_len = 1;
esp->cur_msgout[0] = message_out;
esp_cmd(esp, eregs, ESP_CMD_SATN);
esp_advance_phase(SCptr, in_the_dark);
esp->msgin_len = 0;
}
esp->sreg = esp_read(eregs->esp_status);
esp->sreg &= ~(ESP_STAT_INTR);
if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD))
esp_cmd(esp, eregs, ESP_CMD_MOK);
if((SCptr->SCp.sent_command == in_msgindone) &&
(SCptr->SCp.phase == in_freeing))
return esp_do_freebus(esp, eregs);
return do_intr_end;
}
static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
unsigned char tmp;
Scsi_Cmnd *SCptr = esp->current_SC;
esp_advance_phase(SCptr, in_cmdend);
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
tmp = *esp->esp_scmdp++;
esp->esp_scmdleft--;
esp_write(eregs->esp_fdata, tmp);
esp_cmd(esp, eregs, ESP_CMD_TI);
return do_intr_end;
}
static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
esp_cmd(esp, eregs, ESP_CMD_NULL);
if(esp->ireg & ESP_INTR_BSERV) {
esp_advance_phase(esp->current_SC, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n",
esp->esp_id));
return do_reset_bus;
}
static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
switch(esp->msgout_len) {
case 1:
esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
esp_cmd(esp, eregs, ESP_CMD_TI);
break;
case 2:
if(esp->do_pio_cmds){
esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
esp_cmd(esp, eregs, ESP_CMD_TI);
} else {
esp->esp_command[0] = esp->cur_msgout[0];
esp->esp_command[1] = esp->cur_msgout[1];
esp->dma_setup(esp, esp->esp_command_dvma, 2, 0);
esp_setcount(eregs, 2);
esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
}
break;
case 4:
esp->snip = 1;
if(esp->do_pio_cmds){
esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
esp_write(eregs->esp_fdata, esp->cur_msgout[2]);
esp_write(eregs->esp_fdata, esp->cur_msgout[3]);
esp_cmd(esp, eregs, ESP_CMD_TI);
} else {
esp->esp_command[0] = esp->cur_msgout[0];
esp->esp_command[1] = esp->cur_msgout[1];
esp->esp_command[2] = esp->cur_msgout[2];
esp->esp_command[3] = esp->cur_msgout[3];
esp->dma_setup(esp, esp->esp_command_dvma, 4, 0);
esp_setcount(eregs, 4);
esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
}
break;
case 5:
esp->snip = 1;
if(esp->do_pio_cmds){
esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
esp_write(eregs->esp_fdata, esp->cur_msgout[1]);
esp_write(eregs->esp_fdata, esp->cur_msgout[2]);
esp_write(eregs->esp_fdata, esp->cur_msgout[3]);
esp_write(eregs->esp_fdata, esp->cur_msgout[4]);
esp_cmd(esp, eregs, ESP_CMD_TI);
} else {
esp->esp_command[0] = esp->cur_msgout[0];
esp->esp_command[1] = esp->cur_msgout[1];
esp->esp_command[2] = esp->cur_msgout[2];
esp->esp_command[3] = esp->cur_msgout[3];
esp->esp_command[4] = esp->cur_msgout[4];
esp->dma_setup(esp, esp->esp_command_dvma, 5, 0);
esp_setcount(eregs, 5);
esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI);
}
break;
default:
/* whoops */
ESPMISC(("bogus msgout sending NOP\n"));
esp->cur_msgout[0] = NOP;
esp_write(eregs->esp_fdata, esp->cur_msgout[0]);
esp->msgout_len = 1;
esp_cmd(esp, eregs, ESP_CMD_TI);
break;
}
esp_advance_phase(esp->current_SC, in_msgoutdone);
return do_intr_end;
}
static int esp_do_msgoutdone(struct NCR_ESP *esp,
struct ESP_regs *eregs)
{
if((esp->msgout_len > 1) && esp->dma_barrier)
esp->dma_barrier(esp);
if(!(esp->ireg & ESP_INTR_DC)) {
esp_cmd(esp, eregs, ESP_CMD_NULL);
switch(esp->sreg & ESP_STAT_PMASK) {
case ESP_MOP:
/* whoops, parity error */
ESPLOG(("esp%d: still in msgout, parity error assumed\n",
esp->esp_id));
if(esp->msgout_len > 1)
esp_cmd(esp, eregs, ESP_CMD_SATN);
esp_advance_phase(esp->current_SC, in_msgout);
return do_work_bus;
case ESP_DIP:
break;
default:
if(!fcount(esp, eregs) &&
!(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset))
esp_cmd(esp, eregs, ESP_CMD_FLUSH);
break;
};
}
/* If we sent out a synchronous negotiation message, update
* our state.
*/
if(esp->cur_msgout[2] == EXTENDED_MESSAGE &&
esp->cur_msgout[4] == EXTENDED_SDTR) {
esp->snip = 1; /* anal retentiveness... */
}
esp->prevmsgout = esp->cur_msgout[0];
esp->msgout_len = 0;
esp_advance_phase(esp->current_SC, in_the_dark);
return esp_do_phase_determine(esp, eregs);
}
static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
ESPLOG(("esp%d: command in weird state %2x\n",
esp->esp_id, esp->current_SC->SCp.phase));
return do_reset_bus;
}
static espfunc_t bus_vector[] = {
esp_do_data_finale,
esp_do_data_finale,
esp_bus_unexpected,
esp_do_msgin,
esp_do_msgincont,
esp_do_msgindone,
esp_do_msgout,
esp_do_msgoutdone,
esp_do_cmdbegin,
esp_do_cmddone,
esp_do_status,
esp_do_freebus,
esp_do_phase_determine,
esp_bus_unexpected,
esp_bus_unexpected,
esp_bus_unexpected,
};
/* This is the second tier in our dual-level SCSI state machine. */
static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs)
{
Scsi_Cmnd *SCptr = esp->current_SC;
unsigned int phase;
ESPBUS(("esp_work_bus: "));
if(!SCptr) {
ESPBUS(("reconnect\n"));
return esp_do_reconnect(esp, eregs);
}
phase = SCptr->SCp.phase;
if ((phase & 0xf0) == in_phases_mask)
return bus_vector[(phase & 0x0f)](esp, eregs);
else if((phase & 0xf0) == in_slct_mask)
return esp_select_complete(esp, eregs);
else
return esp_bus_unexpected(esp, eregs);
}
static espfunc_t isvc_vector[] = {
NULL,
esp_do_phase_determine,
esp_do_resetbus,
esp_finish_reset,
esp_work_bus
};
/* Main interrupt handler for an esp adapter. */
void esp_handle(struct NCR_ESP *esp)
{
struct ESP_regs *eregs;
Scsi_Cmnd *SCptr;
int what_next = do_intr_end;
eregs = esp->eregs;
SCptr = esp->current_SC;
if(esp->dma_irq_entry)
esp->dma_irq_entry(esp);
/* Check for errors. */
esp->sreg = esp_read(eregs->esp_status);
esp->sreg &= (~ESP_STAT_INTR);
esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS);
esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */
ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n",
esp->sreg, esp->seqreg, esp->ireg));
if(esp->sreg & (ESP_STAT_SPAM)) {
/* Gross error, could be due to one of:
*
* - top of fifo overwritten, could be because
* we tried to do a synchronous transfer with
* an offset greater than ESP fifo size
*
* - top of command register overwritten
*
* - DMA setup to go in one direction, SCSI
* bus points in the other, whoops
*
* - weird phase change during asynchronous
* data phase while we are initiator
*/
ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg));
/* If a command is live on the bus we cannot safely
* reset the bus, so we'll just let the pieces fall
* where they may. Here we are hoping that the
* target will be able to cleanly go away soon
* so we can safely reset things.
*/
if(!SCptr) {
ESPLOG(("esp%d: No current cmd during gross error, "
"resetting bus\n", esp->esp_id));
what_next = do_reset_bus;
goto state_machine;
}
}
/* No current cmd is only valid at this point when there are
* commands off the bus or we are trying a reset.
*/
if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) {
/* Panic is safe, since current_SC is null. */
ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id));
panic("esp_handle: current_SC == penguin within interrupt!");
}
if(esp->ireg & (ESP_INTR_IC)) {
/* Illegal command fed to ESP. Outside of obvious
* software bugs that could cause this, there is
* a condition with ESP100 where we can confuse the
* ESP into an erroneous illegal command interrupt
* because it does not scrape the FIFO properly
* for reselection. See esp100_reconnect_hwbug()
* to see how we try very hard to avoid this.
*/
ESPLOG(("esp%d: invalid command\n", esp->esp_id));
esp_dump_state(esp, eregs);
if(SCptr) {
/* Devices with very buggy firmware can drop BSY
* during a scatter list interrupt when using sync
* mode transfers. We continue the transfer as
* expected, the target drops the bus, the ESP
* gets confused, and we get a illegal command
* interrupt because the bus is in the disconnected
* state now and ESP_CMD_TI is only allowed when
* a nexus is alive on the bus.
*/
ESPLOG(("esp%d: Forcing async and disabling disconnect for "
"target %d\n", esp->esp_id, SCptr->device->id));
SCptr->device->borken = 1; /* foo on you */
}
what_next = do_reset_bus;
} else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) {
int phase;
if(SCptr) {
phase = SCptr->SCp.phase;
if(phase & in_phases_mask) {
what_next = esp_work_bus(esp, eregs);
} else if(phase & in_slct_mask) {
what_next = esp_select_complete(esp, eregs);
} else {
ESPLOG(("esp%d: interrupt for no good reason...\n",
esp->esp_id));
what_next = do_intr_end;
}
} else {
ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n",
esp->esp_id));
what_next = do_reset_bus;
}
} else if(esp->ireg & ESP_INTR_SR) {
ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id));
what_next = do_reset_complete;
} else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) {
ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n",
esp->esp_id));
what_next = do_reset_bus;
} else if(esp->ireg & ESP_INTR_RSEL) {
if(!SCptr) {
/* This is ok. */
what_next = esp_do_reconnect(esp, eregs);
} else if(SCptr->SCp.phase & in_slct_mask) {
/* Only selection code knows how to clean
* up properly.
*/
ESPDISC(("Reselected during selection attempt\n"));
what_next = esp_select_complete(esp, eregs);
} else {
ESPLOG(("esp%d: Reselected while bus is busy\n",
esp->esp_id));
what_next = do_reset_bus;
}
}
/* This is tier-one in our dual level SCSI state machine. */
state_machine:
while(what_next != do_intr_end) {
if (what_next >= do_phase_determine &&
what_next < do_intr_end)
what_next = isvc_vector[what_next](esp, eregs);
else {
/* state is completely lost ;-( */
ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n",
esp->esp_id));
what_next = do_reset_bus;
}
}
if(esp->dma_irq_exit)
esp->dma_irq_exit(esp);
}
#ifndef CONFIG_SMP
irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
{
struct NCR_ESP *esp;
unsigned long flags;
int again;
struct Scsi_Host *dev = dev_id;
/* Handle all ESP interrupts showing at this IRQ level. */
spin_lock_irqsave(dev->host_lock, flags);
repeat:
again = 0;
for_each_esp(esp) {
#ifndef __mips__
if(((esp)->irq & 0xff) == irq) {
#endif
if(esp->dma_irq_p(esp)) {
again = 1;
esp->dma_ints_off(esp);
ESPIRQ(("I%d(", esp->esp_id));
esp_handle(esp);
ESPIRQ((")"));
esp->dma_ints_on(esp);
}
#ifndef __mips__
}
#endif
}
if(again)
goto repeat;
spin_unlock_irqrestore(dev->host_lock, flags);
return IRQ_HANDLED;
}
#else
/* For SMP we only service one ESP on the list list at our IRQ level! */
irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs)
{
struct NCR_ESP *esp;
unsigned long flags;
struct Scsi_Host *dev = dev_id;
/* Handle all ESP interrupts showing at this IRQ level. */
spin_lock_irqsave(dev->host_lock, flags);
for_each_esp(esp) {
if(((esp)->irq & 0xf) == irq) {
if(esp->dma_irq_p(esp)) {
esp->dma_ints_off(esp);
ESPIRQ(("I[%d:%d](",
smp_processor_id(), esp->esp_id));
esp_handle(esp);
ESPIRQ((")"));
esp->dma_ints_on(esp);
goto out;
}
}
}
out:
spin_unlock_irqrestore(dev->host_lock, flags);
return IRQ_HANDLED;
}
#endif
int esp_slave_alloc(struct scsi_device *SDptr)
{
struct esp_device *esp_dev =
kmalloc(sizeof(struct esp_device), GFP_ATOMIC);
if (!esp_dev)
return -ENOMEM;
memset(esp_dev, 0, sizeof(struct esp_device));
SDptr->hostdata = esp_dev;
return 0;
}
void esp_slave_destroy(struct scsi_device *SDptr)
{
struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata;
esp->targets_present &= ~(1 << sdev_id(SDptr));
kfree(SDptr->hostdata);
SDptr->hostdata = NULL;
}
#ifdef MODULE
int init_module(void) { return 0; }
void cleanup_module(void) {}
void esp_release(void)
{
esps_in_use--;
esps_running = esps_in_use;
}
#endif
EXPORT_SYMBOL(esp_abort);
EXPORT_SYMBOL(esp_allocate);
EXPORT_SYMBOL(esp_deallocate);
EXPORT_SYMBOL(esp_initialize);
EXPORT_SYMBOL(esp_intr);
EXPORT_SYMBOL(esp_queue);
EXPORT_SYMBOL(esp_reset);
EXPORT_SYMBOL(esp_slave_alloc);
EXPORT_SYMBOL(esp_slave_destroy);
EXPORT_SYMBOL(esps_in_use);
MODULE_LICENSE("GPL");