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NCR5380.c
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NCR5380.c
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/*
* NCR 5380 generic driver routines. These should make it *trivial*
* to implement 5380 SCSI drivers under Linux with a non-trantor
* architecture.
*
* Note that these routines also work with NR53c400 family chips.
*
* Copyright 1993, Drew Eckhardt
* Visionary Computing
* (Unix and Linux consulting and custom programming)
* +1 (303) 666-5836
*
* DISTRIBUTION RELEASE 6.
*
* For more information, please consult
*
* NCR 5380 Family
* SCSI Protocol Controller
* Databook
*
* NCR Microelectronics
* 1635 Aeroplaza Drive
* Colorado Springs, CO 80916
* 1+ (719) 578-3400
* 1+ (800) 334-5454
*/
/*
* $Log: NCR5380.c,v $
* Revision 1.10 1998/9/2 Alan Cox
* Fixed up the timer lockups reported so far. Things still suck. Looking
* forward to 2.3 and per device request queues. Then it'll be possible to
* SMP thread this beast and improve life no end.
* Revision 1.9 1997/7/27 Ronald van Cuijlenborg
* (hopefully) fixed and enhanced USLEEP
* added support for DTC3181E card (for Mustek scanner)
*
* Revision 1.8 Ingmar Baumgart
* added support for NCR53C400a card
*
* Revision 1.7 1996/3/2 Ray Van Tassle ([email protected])
* added proc_info
* added support needed for DTC 3180/3280
* fixed a couple of bugs
*
* Revision 1.5 1994/01/19 09:14:57 drew
* Fixed udelay() hack that was being used on DATAOUT phases
* instead of a proper wait for the final handshake.
*
* Revision 1.4 1994/01/19 06:44:25 drew
* *** empty log message ***
*
* Revision 1.3 1994/01/19 05:24:40 drew
* Added support for TCR LAST_BYTE_SENT bit.
*
* Revision 1.2 1994/01/15 06:14:11 drew
* REAL DMA support, bug fixes.
*
* Revision 1.1 1994/01/15 06:00:54 drew
* Initial revision
*
*/
/*
* Further development / testing that should be done :
* 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
* code so that everything does the same thing that's done at the
* end of a pseudo-DMA read operation.
*
* 2. Fix REAL_DMA (interrupt driven, polled works fine) -
* basically, transfer size needs to be reduced by one
* and the last byte read as is done with PSEUDO_DMA.
*
* 4. Test SCSI-II tagged queueing (I have no devices which support
* tagged queueing)
*
* 5. Test linked command handling code after Eric is ready with
* the high level code.
*/
#include <scsi/scsi_dbg.h>
#if (NDEBUG & NDEBUG_LISTS)
#define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); }
#define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); }
#else
#define LIST(x,y)
#define REMOVE(w,x,y,z)
#endif
#ifndef notyet
#undef LINKED
#undef REAL_DMA
#endif
#ifdef REAL_DMA_POLL
#undef READ_OVERRUNS
#define READ_OVERRUNS
#endif
#ifdef BOARD_REQUIRES_NO_DELAY
#define io_recovery_delay(x)
#else
#define io_recovery_delay(x) udelay(x)
#endif
/*
* Design
*
* This is a generic 5380 driver. To use it on a different platform,
* one simply writes appropriate system specific macros (ie, data
* transfer - some PC's will use the I/O bus, 68K's must use
* memory mapped) and drops this file in their 'C' wrapper.
*
* (Note from hch: unfortunately it was not enough for the different
* m68k folks and instead of improving this driver they copied it
* and hacked it up for their needs. As a consequence they lost
* most updates to this driver. Maybe someone will fix all these
* drivers to use a common core one day..)
*
* As far as command queueing, two queues are maintained for
* each 5380 in the system - commands that haven't been issued yet,
* and commands that are currently executing. This means that an
* unlimited number of commands may be queued, letting
* more commands propagate from the higher driver levels giving higher
* throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
* allowing multiple commands to propagate all the way to a SCSI-II device
* while a command is already executing.
*
*
* Issues specific to the NCR5380 :
*
* When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
* piece of hardware that requires you to sit in a loop polling for
* the REQ signal as long as you are connected. Some devices are
* brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
* while doing long seek operations.
*
* The workaround for this is to keep track of devices that have
* disconnected. If the device hasn't disconnected, for commands that
* should disconnect, we do something like
*
* while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
*
* Some tweaking of N and M needs to be done. An algorithm based
* on "time to data" would give the best results as long as short time
* to datas (ie, on the same track) were considered, however these
* broken devices are the exception rather than the rule and I'd rather
* spend my time optimizing for the normal case.
*
* Architecture :
*
* At the heart of the design is a coroutine, NCR5380_main,
* which is started from a workqueue for each NCR5380 host in the
* system. It attempts to establish I_T_L or I_T_L_Q nexuses by
* removing the commands from the issue queue and calling
* NCR5380_select() if a nexus is not established.
*
* Once a nexus is established, the NCR5380_information_transfer()
* phase goes through the various phases as instructed by the target.
* if the target goes into MSG IN and sends a DISCONNECT message,
* the command structure is placed into the per instance disconnected
* queue, and NCR5380_main tries to find more work. If the target is
* idle for too long, the system will try to sleep.
*
* If a command has disconnected, eventually an interrupt will trigger,
* calling NCR5380_intr() which will in turn call NCR5380_reselect
* to reestablish a nexus. This will run main if necessary.
*
* On command termination, the done function will be called as
* appropriate.
*
* SCSI pointers are maintained in the SCp field of SCSI command
* structures, being initialized after the command is connected
* in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
* Note that in violation of the standard, an implicit SAVE POINTERS operation
* is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
*/
/*
* Using this file :
* This file a skeleton Linux SCSI driver for the NCR 5380 series
* of chips. To use it, you write an architecture specific functions
* and macros and include this file in your driver.
*
* These macros control options :
* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
* defined.
*
* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
* for commands that return with a CHECK CONDITION status.
*
* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
* transceivers.
*
* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
* override-configure an IRQ.
*
* LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
* bytes at a time. Since interrupts are disabled by default during
* these transfers, we might need this to give reasonable interrupt
* service time if the transfer size gets too large.
*
* LINKED - if defined, linked commands are supported.
*
* PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
*
* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
*
* REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
* rely on phase mismatch and EOP interrupts to determine end
* of phase.
*
* UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
* only really want to use this if you're having a problem with
* dropped characters during high speed communications, and even
* then, you're going to be better off twiddling with transfersize
* in the high level code.
*
* Defaults for these will be provided although the user may want to adjust
* these to allocate CPU resources to the SCSI driver or "real" code.
*
* USLEEP_SLEEP - amount of time, in jiffies, to sleep
*
* USLEEP_POLL - amount of time, in jiffies, to poll
*
* These macros MUST be defined :
* NCR5380_local_declare() - declare any local variables needed for your
* transfer routines.
*
* NCR5380_setup(instance) - initialize any local variables needed from a given
* instance of the host adapter for NCR5380_{read,write,pread,pwrite}
*
* NCR5380_read(register) - read from the specified register
*
* NCR5380_write(register, value) - write to the specific register
*
* NCR5380_implementation_fields - additional fields needed for this
* specific implementation of the NCR5380
*
* Either real DMA *or* pseudo DMA may be implemented
* REAL functions :
* NCR5380_REAL_DMA should be defined if real DMA is to be used.
* Note that the DMA setup functions should return the number of bytes
* that they were able to program the controller for.
*
* Also note that generic i386/PC versions of these macros are
* available as NCR5380_i386_dma_write_setup,
* NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
*
* NCR5380_dma_write_setup(instance, src, count) - initialize
* NCR5380_dma_read_setup(instance, dst, count) - initialize
* NCR5380_dma_residual(instance); - residual count
*
* PSEUDO functions :
* NCR5380_pwrite(instance, src, count)
* NCR5380_pread(instance, dst, count);
*
* The generic driver is initialized by calling NCR5380_init(instance),
* after setting the appropriate host specific fields and ID. If the
* driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
* possible) function may be used.
*/
static int do_abort(struct Scsi_Host *host);
static void do_reset(struct Scsi_Host *host);
/*
* initialize_SCp - init the scsi pointer field
* @cmd: command block to set up
*
* Set up the internal fields in the SCSI command.
*/
static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
{
/*
* Initialize the Scsi Pointer field so that all of the commands in the
* various queues are valid.
*/
if (cmd->use_sg) {
cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
cmd->SCp.buffers_residual = cmd->use_sg - 1;
cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+
cmd->SCp.buffer->offset;
cmd->SCp.this_residual = cmd->SCp.buffer->length;
} else {
cmd->SCp.buffer = NULL;
cmd->SCp.buffers_residual = 0;
cmd->SCp.ptr = (char *) cmd->request_buffer;
cmd->SCp.this_residual = cmd->request_bufflen;
}
}
/**
* NCR5380_poll_politely - wait for NCR5380 status bits
* @instance: controller to poll
* @reg: 5380 register to poll
* @bit: Bitmask to check
* @val: Value required to exit
*
* Polls the NCR5380 in a reasonably efficient manner waiting for
* an event to occur, after a short quick poll we begin giving the
* CPU back in non IRQ contexts
*
* Returns the value of the register or a negative error code.
*/
static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t)
{
NCR5380_local_declare();
int n = 500; /* At about 8uS a cycle for the cpu access */
unsigned long end = jiffies + t;
int r;
NCR5380_setup(instance);
while( n-- > 0)
{
r = NCR5380_read(reg);
if((r & bit) == val)
return 0;
cpu_relax();
}
/* t time yet ? */
while(time_before(jiffies, end))
{
r = NCR5380_read(reg);
if((r & bit) == val)
return 0;
if(!in_interrupt())
yield();
else
cpu_relax();
}
return -ETIMEDOUT;
}
static struct {
unsigned char value;
const char *name;
} phases[] = {
{PHASE_DATAOUT, "DATAOUT"},
{PHASE_DATAIN, "DATAIN"},
{PHASE_CMDOUT, "CMDOUT"},
{PHASE_STATIN, "STATIN"},
{PHASE_MSGOUT, "MSGOUT"},
{PHASE_MSGIN, "MSGIN"},
{PHASE_UNKNOWN, "UNKNOWN"}
};
#ifdef NDEBUG
static struct {
unsigned char mask;
const char *name;
} signals[] = {
{SR_DBP, "PARITY"},
{SR_RST, "RST"},
{SR_BSY, "BSY"},
{SR_REQ, "REQ"},
{SR_MSG, "MSG"},
{SR_CD, "CD"},
{SR_IO, "IO"},
{SR_SEL, "SEL"},
{0, NULL}
},
basrs[] = {
{BASR_ATN, "ATN"},
{BASR_ACK, "ACK"},
{0, NULL}
},
icrs[] = {
{ICR_ASSERT_RST, "ASSERT RST"},
{ICR_ASSERT_ACK, "ASSERT ACK"},
{ICR_ASSERT_BSY, "ASSERT BSY"},
{ICR_ASSERT_SEL, "ASSERT SEL"},
{ICR_ASSERT_ATN, "ASSERT ATN"},
{ICR_ASSERT_DATA, "ASSERT DATA"},
{0, NULL}
},
mrs[] = {
{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
{MR_TARGET, "MODE TARGET"},
{MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
{MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
{MR_MONITOR_BSY, "MODE MONITOR BSY"},
{MR_DMA_MODE, "MODE DMA"},
{MR_ARBITRATE, "MODE ARBITRATION"},
{0, NULL}
};
/**
* NCR5380_print - print scsi bus signals
* @instance: adapter state to dump
*
* Print the SCSI bus signals for debugging purposes
*
* Locks: caller holds hostdata lock (not essential)
*/
static void NCR5380_print(struct Scsi_Host *instance)
{
NCR5380_local_declare();
unsigned char status, data, basr, mr, icr, i;
NCR5380_setup(instance);
data = NCR5380_read(CURRENT_SCSI_DATA_REG);
status = NCR5380_read(STATUS_REG);
mr = NCR5380_read(MODE_REG);
icr = NCR5380_read(INITIATOR_COMMAND_REG);
basr = NCR5380_read(BUS_AND_STATUS_REG);
printk("STATUS_REG: %02x ", status);
for (i = 0; signals[i].mask; ++i)
if (status & signals[i].mask)
printk(",%s", signals[i].name);
printk("\nBASR: %02x ", basr);
for (i = 0; basrs[i].mask; ++i)
if (basr & basrs[i].mask)
printk(",%s", basrs[i].name);
printk("\nICR: %02x ", icr);
for (i = 0; icrs[i].mask; ++i)
if (icr & icrs[i].mask)
printk(",%s", icrs[i].name);
printk("\nMODE: %02x ", mr);
for (i = 0; mrs[i].mask; ++i)
if (mr & mrs[i].mask)
printk(",%s", mrs[i].name);
printk("\n");
}
/*
* NCR5380_print_phase - show SCSI phase
* @instance: adapter to dump
*
* Print the current SCSI phase for debugging purposes
*
* Locks: none
*/
static void NCR5380_print_phase(struct Scsi_Host *instance)
{
NCR5380_local_declare();
unsigned char status;
int i;
NCR5380_setup(instance);
status = NCR5380_read(STATUS_REG);
if (!(status & SR_REQ))
printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no);
else {
for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i);
printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
}
}
#endif
/*
* These need tweaking, and would probably work best as per-device
* flags initialized differently for disk, tape, cd, etc devices.
* People with broken devices are free to experiment as to what gives
* the best results for them.
*
* USLEEP_SLEEP should be a minimum seek time.
*
* USLEEP_POLL should be a maximum rotational latency.
*/
#ifndef USLEEP_SLEEP
/* 20 ms (reasonable hard disk speed) */
#define USLEEP_SLEEP (20*HZ/1000)
#endif
/* 300 RPM (floppy speed) */
#ifndef USLEEP_POLL
#define USLEEP_POLL (200*HZ/1000)
#endif
#ifndef USLEEP_WAITLONG
/* RvC: (reasonable time to wait on select error) */
#define USLEEP_WAITLONG USLEEP_SLEEP
#endif
/*
* Function : int should_disconnect (unsigned char cmd)
*
* Purpose : decide weather a command would normally disconnect or
* not, since if it won't disconnect we should go to sleep.
*
* Input : cmd - opcode of SCSI command
*
* Returns : DISCONNECT_LONG if we should disconnect for a really long
* time (ie always, sleep, look for REQ active, sleep),
* DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
* time-to-data delay, DISCONNECT_NONE if this command would return
* immediately.
*
* Future sleep algorithms based on time to data can exploit
* something like this so they can differentiate between "normal"
* (ie, read, write, seek) and unusual commands (ie, * format).
*
* Note : We don't deal with commands that handle an immediate disconnect,
*
*/
static int should_disconnect(unsigned char cmd)
{
switch (cmd) {
case READ_6:
case WRITE_6:
case SEEK_6:
case READ_10:
case WRITE_10:
case SEEK_10:
return DISCONNECT_TIME_TO_DATA;
case FORMAT_UNIT:
case SEARCH_HIGH:
case SEARCH_LOW:
case SEARCH_EQUAL:
return DISCONNECT_LONG;
default:
return DISCONNECT_NONE;
}
}
static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout)
{
hostdata->time_expires = jiffies + timeout;
schedule_delayed_work(&hostdata->coroutine, timeout);
}
static int probe_irq __initdata = 0;
/**
* probe_intr - helper for IRQ autoprobe
* @irq: interrupt number
* @dev_id: unused
* @regs: unused
*
* Set a flag to indicate the IRQ in question was received. This is
* used by the IRQ probe code.
*/
static irqreturn_t __init probe_intr(int irq, void *dev_id,
struct pt_regs *regs)
{
probe_irq = irq;
return IRQ_HANDLED;
}
/**
* NCR5380_probe_irq - find the IRQ of an NCR5380
* @instance: NCR5380 controller
* @possible: bitmask of ISA IRQ lines
*
* Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
* and then looking to see what interrupt actually turned up.
*
* Locks: none, irqs must be enabled on entry
*/
static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible)
{
NCR5380_local_declare();
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
unsigned long timeout;
int trying_irqs, i, mask;
NCR5380_setup(instance);
for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0))
trying_irqs |= mask;
timeout = jiffies + (250 * HZ / 1000);
probe_irq = SCSI_IRQ_NONE;
/*
* A interrupt is triggered whenever BSY = false, SEL = true
* and a bit set in the SELECT_ENABLE_REG is asserted on the
* SCSI bus.
*
* Note that the bus is only driven when the phase control signals
* (I/O, C/D, and MSG) match those in the TCR, so we must reset that
* to zero.
*/
NCR5380_write(TARGET_COMMAND_REG, 0);
NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout))
{
set_current_state(TASK_UNINTERRUPTIBLE);
schedule_timeout(1);
}
NCR5380_write(SELECT_ENABLE_REG, 0);
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
if (trying_irqs & mask)
free_irq(i, NULL);
return probe_irq;
}
/**
* NCR58380_print_options - show options
* @instance: unused for now
*
* Called by probe code indicating the NCR5380 driver options that
* were selected. At some point this will switch to runtime options
* read from the adapter in question
*
* Locks: none
*/
static void __init NCR5380_print_options(struct Scsi_Host *instance)
{
printk(" generic options"
#ifdef AUTOPROBE_IRQ
" AUTOPROBE_IRQ"
#endif
#ifdef AUTOSENSE
" AUTOSENSE"
#endif
#ifdef DIFFERENTIAL
" DIFFERENTIAL"
#endif
#ifdef REAL_DMA
" REAL DMA"
#endif
#ifdef REAL_DMA_POLL
" REAL DMA POLL"
#endif
#ifdef PARITY
" PARITY"
#endif
#ifdef PSEUDO_DMA
" PSEUDO DMA"
#endif
#ifdef UNSAFE
" UNSAFE "
#endif
);
printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
}
}
/**
* NCR5380_print_status - dump controller info
* @instance: controller to dump
*
* Print commands in the various queues, called from NCR5380_abort
* and NCR5380_debug to aid debugging.
*
* Locks: called functions disable irqs
*/
static void NCR5380_print_status(struct Scsi_Host *instance)
{
NCR5380_dprint(NDEBUG_ANY, instance);
NCR5380_dprint_phase(NDEBUG_ANY, instance);
}
/******************************************/
/*
* /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
*
* *buffer: I/O buffer
* **start: if inout == FALSE pointer into buffer where user read should start
* offset: current offset
* length: length of buffer
* hostno: Scsi_Host host_no
* inout: TRUE - user is writing; FALSE - user is reading
*
* Return the number of bytes read from or written
*/
#undef SPRINTF
#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
static
char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
static
char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
static
char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
static
int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout)
{
char *pos = buffer;
struct NCR5380_hostdata *hostdata;
Scsi_Cmnd *ptr;
hostdata = (struct NCR5380_hostdata *) instance->hostdata;
if (inout) { /* Has data been written to the file ? */
#ifdef DTC_PUBLIC_RELEASE
dtc_wmaxi = dtc_maxi = 0;
#endif
#ifdef PAS16_PUBLIC_RELEASE
pas_wmaxi = pas_maxi = 0;
#endif
return (-ENOSYS); /* Currently this is a no-op */
}
SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
#ifdef DTC_PUBLIC_RELEASE
SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
#endif
#ifdef T128_PUBLIC_RELEASE
SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
#endif
#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
#endif
#ifdef PAS16_PUBLIC_RELEASE
SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
#endif
SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
SPRINTF("io_port: %04x ", (int) instance->io_port);
if (instance->irq == SCSI_IRQ_NONE)
SPRINTF("IRQ: None.\n");
else
SPRINTF("IRQ: %d.\n", instance->irq);
#ifdef DTC_PUBLIC_RELEASE
SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi);
#endif
#ifdef PAS16_PUBLIC_RELEASE
SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi);
#endif
spin_lock_irq(instance->host_lock);
if (!hostdata->connected)
SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
else
pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length);
SPRINTF("scsi%d: issue_queue\n", instance->host_no);
for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble)
pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
spin_unlock_irq(instance->host_lock);
*start = buffer;
if (pos - buffer < offset)
return 0;
else if (pos - buffer - offset < length)
return pos - buffer - offset;
return length;
}
static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
{
SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun);
SPRINTF(" command = ");
pos = lprint_command(cmd->cmnd, pos, buffer, length);
return (pos);
}
static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length)
{
int i, s;
pos = lprint_opcode(command[0], pos, buffer, length);
for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
SPRINTF("%02x ", command[i]);
SPRINTF("\n");
return (pos);
}
static char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
{
SPRINTF("%2d (0x%02x)", opcode, opcode);
return (pos);
}
/**
* NCR5380_init - initialise an NCR5380
* @instance: adapter to configure
* @flags: control flags
*
* Initializes *instance and corresponding 5380 chip,
* with flags OR'd into the initial flags value.
*
* Notes : I assume that the host, hostno, and id bits have been
* set correctly. I don't care about the irq and other fields.
*
* Returns 0 for success
*
* Locks: interrupts must be enabled when we are called
*/
static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags)
{
NCR5380_local_declare();
int i, pass;
unsigned long timeout;
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
if(in_interrupt())
printk(KERN_ERR "NCR5380_init called with interrupts off!\n");
/*
* On NCR53C400 boards, NCR5380 registers are mapped 8 past
* the base address.
*/
#ifdef NCR53C400
if (flags & FLAG_NCR53C400)
instance->NCR5380_instance_name += NCR53C400_address_adjust;
#endif
NCR5380_setup(instance);
hostdata->aborted = 0;
hostdata->id_mask = 1 << instance->this_id;
for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
if (i > hostdata->id_mask)
hostdata->id_higher_mask |= i;
for (i = 0; i < 8; ++i)
hostdata->busy[i] = 0;
#ifdef REAL_DMA
hostdata->dmalen = 0;
#endif
hostdata->targets_present = 0;
hostdata->connected = NULL;
hostdata->issue_queue = NULL;
hostdata->disconnected_queue = NULL;
INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata);
#ifdef NCR5380_STATS
for (i = 0; i < 8; ++i) {
hostdata->time_read[i] = 0;
hostdata->time_write[i] = 0;
hostdata->bytes_read[i] = 0;
hostdata->bytes_write[i] = 0;
}
hostdata->timebase = 0;
hostdata->pendingw = 0;
hostdata->pendingr = 0;
#endif
/* The CHECK code seems to break the 53C400. Will check it later maybe */
if (flags & FLAG_NCR53C400)
hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
else
hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
hostdata->host = instance;
hostdata->time_expires = 0;
#ifndef AUTOSENSE
if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n"
" be incorrectly cleared.\n", instance->host_no);
#endif /* def AUTOSENSE */
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
NCR5380_write(MODE_REG, MR_BASE);
NCR5380_write(TARGET_COMMAND_REG, 0);
NCR5380_write(SELECT_ENABLE_REG, 0);
#ifdef NCR53C400
if (hostdata->flags & FLAG_NCR53C400) {
NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
}
#endif
/*
* Detect and correct bus wedge problems.
*
* If the system crashed, it may have crashed in a state
* where a SCSI command was still executing, and the
* SCSI bus is not in a BUS FREE STATE.
*
* If this is the case, we'll try to abort the currently
* established nexus which we know nothing about, and that
* failing, do a hard reset of the SCSI bus
*/
for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
switch (pass) {
case 1:
case 3:
case 5:
printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no);
timeout = jiffies + 5 * HZ;
NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ);
break;
case 2:
printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no);
do_abort(instance);
break;
case 4:
printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no);
do_reset(instance);
break;
case 6:
printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no);
return -ENXIO;
}
}
return 0;
}
/**
* NCR5380_exit - remove an NCR5380
* @instance: adapter to remove
*/
static void __devexit NCR5380_exit(struct Scsi_Host *instance)
{
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
cancel_delayed_work(&hostdata->coroutine);
flush_scheduled_work();
}
/**
* NCR5380_queue_command - queue a command
* @cmd: SCSI command
* @done: completion handler
*
* cmd is added to the per instance issue_queue, with minor
* twiddling done to the host specific fields of cmd. If the
* main coroutine is not running, it is restarted.
*
* Locks: host lock taken by caller
*/
static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
{
struct Scsi_Host *instance = cmd->device->host;
struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
Scsi_Cmnd *tmp;
#if (NDEBUG & NDEBUG_NO_WRITE)
switch (cmd->cmnd[0]) {
case WRITE_6:
case WRITE_10:
printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no);
cmd->result = (DID_ERROR << 16);
done(cmd);
return 0;
}
#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
#ifdef NCR5380_STATS
switch (cmd->cmnd[0]) {
case WRITE:
case WRITE_6:
case WRITE_10:
hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
hostdata->pendingw++;
break;
case READ:
case READ_6:
case READ_10:
hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
hostdata->pendingr++;
break;
}
#endif
/*
* We use the host_scribble field as a pointer to the next command
* in a queue
*/
cmd->host_scribble = NULL;
cmd->scsi_done = done;
cmd->result = 0;
/*
* Insert the cmd into the issue queue. Note that REQUEST SENSE
* commands are added to the head of the queue since any command will
* clear the contingent allegiance condition that exists and the
* sense data is only guaranteed to be valid while the condition exists.
*/