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53c7xx.c
6103 lines (5523 loc) · 191 KB
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53c7xx.c
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/*
* 53c710 driver. Modified from Drew Eckhardts driver
* for 53c810 by Richard Hirst [richard@sleepie.demon.co.uk]
* Check out PERM_OPTIONS and EXPECTED_CLOCK, which may be defined in the
* relevant machine specific file (eg. mvme16x.[ch], amiga7xx.[ch]).
* There are also currently some defines at the top of 53c7xx.scr.
* The chip type is #defined in script_asm.pl, as well as the Makefile.
* Host scsi ID expected to be 7 - see NCR53c7x0_init().
*
* I have removed the PCI code and some of the 53c8xx specific code -
* simply to make this file smaller and easier to manage.
*
* MVME16x issues:
* Problems trying to read any chip registers in NCR53c7x0_init(), as they
* may never have been set by 16xBug (eg. If kernel has come in over tftp).
*/
/*
* Adapted for Linux/m68k Amiga platforms for the A4000T/A4091 and
* WarpEngine SCSI controllers.
* By Alan Hourihane <alanh@fairlite.demon.co.uk>
* Thanks to Richard Hirst for making it possible with the MVME additions
*/
/*
* 53c710 rev 0 doesn't support add with carry. Rev 1 and 2 does. To
* overcome this problem you can define FORCE_DSA_ALIGNMENT, which ensures
* that the DSA address is always xxxxxx00. If disconnection is not allowed,
* then the script only ever tries to add small (< 256) positive offsets to
* DSA, so lack of carry isn't a problem. FORCE_DSA_ALIGNMENT can, of course,
* be defined for all chip revisions at a small cost in memory usage.
*/
#define FORCE_DSA_ALIGNMENT
/*
* Selection timer does not always work on the 53c710, depending on the
* timing at the last disconnect, if this is a problem for you, try
* using validids as detailed below.
*
* Options for the NCR7xx driver
*
* noasync:0 - disables sync and asynchronous negotiation
* nosync:0 - disables synchronous negotiation (does async)
* nodisconnect:0 - disables disconnection
* validids:0x?? - Bitmask field that disallows certain ID's.
* - e.g. 0x03 allows ID 0,1
* - 0x1F allows ID 0,1,2,3,4
* opthi:n - replace top word of options with 'n'
* optlo:n - replace bottom word of options with 'n'
* - ALWAYS SPECIFY opthi THEN optlo <<<<<<<<<<
*/
/*
* PERM_OPTIONS are driver options which will be enabled for all NCR boards
* in the system at driver initialization time.
*
* Don't THINK about touching these in PERM_OPTIONS :
* OPTION_MEMORY_MAPPED
* 680x0 doesn't have an IO map!
*
* OPTION_DEBUG_TEST1
* Test 1 does bus mastering and interrupt tests, which will help weed
* out brain damaged main boards.
*
* Other PERM_OPTIONS settings are listed below. Note the actual options
* required are set in the relevant file (mvme16x.c, amiga7xx.c, etc):
*
* OPTION_NO_ASYNC
* Don't negotiate for asynchronous transfers on the first command
* when OPTION_ALWAYS_SYNCHRONOUS is set. Useful for dain bramaged
* devices which do something bad rather than sending a MESSAGE
* REJECT back to us like they should if they can't cope.
*
* OPTION_SYNCHRONOUS
* Enable support for synchronous transfers. Target negotiated
* synchronous transfers will be responded to. To initiate
* a synchronous transfer request, call
*
* request_synchronous (hostno, target)
*
* from within KGDB.
*
* OPTION_ALWAYS_SYNCHRONOUS
* Negotiate for synchronous transfers with every target after
* driver initialization or a SCSI bus reset. This is a bit dangerous,
* since there are some dain bramaged SCSI devices which will accept
* SDTR messages but keep talking asynchronously.
*
* OPTION_DISCONNECT
* Enable support for disconnect/reconnect. To change the
* default setting on a given host adapter, call
*
* request_disconnect (hostno, allow)
*
* where allow is non-zero to allow, 0 to disallow.
*
* If you really want to run 10MHz FAST SCSI-II transfers, you should
* know that the NCR driver currently ignores parity information. Most
* systems do 5MHz SCSI fine. I've seen a lot that have problems faster
* than 8MHz. To play it safe, we only request 5MHz transfers.
*
* If you'd rather get 10MHz transfers, edit sdtr_message and change
* the fourth byte from 50 to 25.
*/
/*
* Sponsored by
* iX Multiuser Multitasking Magazine
* Hannover, Germany
* hm@ix.de
*
* Copyright 1993, 1994, 1995 Drew Eckhardt
* Visionary Computing
* (Unix and Linux consulting and custom programming)
* drew@PoohSticks.ORG
* +1 (303) 786-7975
*
* TolerANT and SCSI SCRIPTS are registered trademarks of NCR Corporation.
*
* For more information, please consult
*
* NCR53C810
* SCSI I/O Processor
* Programmer's Guide
*
* NCR 53C810
* PCI-SCSI I/O Processor
* Data Manual
*
* NCR 53C810/53C820
* PCI-SCSI I/O Processor Design In Guide
*
* For literature on Symbios Logic Inc. formerly NCR, SCSI,
* and Communication products please call (800) 334-5454 or
* (719) 536-3300.
*
* PCI BIOS Specification Revision
* PCI Local Bus Specification
* PCI System Design Guide
*
* PCI Special Interest Group
* M/S HF3-15A
* 5200 N.E. Elam Young Parkway
* Hillsboro, Oregon 97124-6497
* +1 (503) 696-2000
* +1 (800) 433-5177
*/
/*
* Design issues :
* The cumulative latency needed to propagate a read/write request
* through the file system, buffer cache, driver stacks, SCSI host, and
* SCSI device is ultimately the limiting factor in throughput once we
* have a sufficiently fast host adapter.
*
* So, to maximize performance we want to keep the ratio of latency to data
* transfer time to a minimum by
* 1. Minimizing the total number of commands sent (typical command latency
* including drive and bus mastering host overhead is as high as 4.5ms)
* to transfer a given amount of data.
*
* This is accomplished by placing no arbitrary limit on the number
* of scatter/gather buffers supported, since we can transfer 1K
* per scatter/gather buffer without Eric's cluster patches,
* 4K with.
*
* 2. Minimizing the number of fatal interrupts serviced, since
* fatal interrupts halt the SCSI I/O processor. Basically,
* this means offloading the practical maximum amount of processing
* to the SCSI chip.
*
* On the NCR53c810/820/720, this is accomplished by using
* interrupt-on-the-fly signals when commands complete,
* and only handling fatal errors and SDTR / WDTR messages
* in the host code.
*
* On the NCR53c710, interrupts are generated as on the NCR53c8x0,
* only the lack of a interrupt-on-the-fly facility complicates
* things. Also, SCSI ID registers and commands are
* bit fielded rather than binary encoded.
*
* On the NCR53c700 and NCR53c700-66, operations that are done via
* indirect, table mode on the more advanced chips must be
* replaced by calls through a jump table which
* acts as a surrogate for the DSA. Unfortunately, this
* will mean that we must service an interrupt for each
* disconnect/reconnect.
*
* 3. Eliminating latency by pipelining operations at the different levels.
*
* This driver allows a configurable number of commands to be enqueued
* for each target/lun combination (experimentally, I have discovered
* that two seems to work best) and will ultimately allow for
* SCSI-II tagged queuing.
*
*
* Architecture :
* This driver is built around a Linux queue of commands waiting to
* be executed, and a shared Linux/NCR array of commands to start. Commands
* are transferred to the array by the run_process_issue_queue() function
* which is called whenever a command completes.
*
* As commands are completed, the interrupt routine is triggered,
* looks for commands in the linked list of completed commands with
* valid status, removes these commands from a list of running commands,
* calls the done routine, and flags their target/luns as not busy.
*
* Due to limitations in the intelligence of the NCR chips, certain
* concessions are made. In many cases, it is easier to dynamically
* generate/fix-up code rather than calculate on the NCR at run time.
* So, code is generated or fixed up for
*
* - Handling data transfers, using a variable number of MOVE instructions
* interspersed with CALL MSG_IN, WHEN MSGIN instructions.
*
* The DATAIN and DATAOUT routines are separate, so that an incorrect
* direction can be trapped, and space isn't wasted.
*
* It may turn out that we're better off using some sort
* of table indirect instruction in a loop with a variable
* sized table on the NCR53c710 and newer chips.
*
* - Checking for reselection (NCR53c710 and better)
*
* - Handling the details of SCSI context switches (NCR53c710 and better),
* such as reprogramming appropriate synchronous parameters,
* removing the dsa structure from the NCR's queue of outstanding
* commands, etc.
*
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/types.h>
#include <asm/setup.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/system.h>
#include <linux/delay.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/time.h>
#include <linux/blkdev.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <asm/pgtable.h>
#ifdef CONFIG_AMIGA
#include <asm/amigahw.h>
#include <asm/amigaints.h>
#include <asm/irq.h>
#define BIG_ENDIAN
#define NO_IO_SPACE
#endif
#ifdef CONFIG_MVME16x
#include <asm/mvme16xhw.h>
#define BIG_ENDIAN
#define NO_IO_SPACE
#define VALID_IDS
#endif
#ifdef CONFIG_BVME6000
#include <asm/bvme6000hw.h>
#define BIG_ENDIAN
#define NO_IO_SPACE
#define VALID_IDS
#endif
#include "scsi.h"
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_host.h>
#include "53c7xx.h"
#include <linux/stat.h>
#include <linux/stddef.h>
#ifdef NO_IO_SPACE
/*
* The following make the definitions in 53c7xx.h (write8, etc) smaller,
* we don't have separate i/o space anyway.
*/
#undef inb
#undef outb
#undef inw
#undef outw
#undef inl
#undef outl
#define inb(x) 1
#define inw(x) 1
#define inl(x) 1
#define outb(x,y) 1
#define outw(x,y) 1
#define outl(x,y) 1
#endif
static int check_address (unsigned long addr, int size);
static void dump_events (struct Scsi_Host *host, int count);
static Scsi_Cmnd * return_outstanding_commands (struct Scsi_Host *host,
int free, int issue);
static void hard_reset (struct Scsi_Host *host);
static void ncr_scsi_reset (struct Scsi_Host *host);
static void print_lots (struct Scsi_Host *host);
static void set_synchronous (struct Scsi_Host *host, int target, int sxfer,
int scntl3, int now_connected);
static int datapath_residual (struct Scsi_Host *host);
static const char * sbcl_to_phase (int sbcl);
static void print_progress (Scsi_Cmnd *cmd);
static void print_queues (struct Scsi_Host *host);
static void process_issue_queue (unsigned long flags);
static int shutdown (struct Scsi_Host *host);
static void abnormal_finished (struct NCR53c7x0_cmd *cmd, int result);
static int disable (struct Scsi_Host *host);
static int NCR53c7xx_run_tests (struct Scsi_Host *host);
static irqreturn_t NCR53c7x0_intr(int irq, void *dev_id, struct pt_regs * regs);
static void NCR53c7x0_intfly (struct Scsi_Host *host);
static int ncr_halt (struct Scsi_Host *host);
static void intr_phase_mismatch (struct Scsi_Host *host, struct NCR53c7x0_cmd
*cmd);
static void intr_dma (struct Scsi_Host *host, struct NCR53c7x0_cmd *cmd);
static void print_dsa (struct Scsi_Host *host, u32 *dsa,
const char *prefix);
static int print_insn (struct Scsi_Host *host, const u32 *insn,
const char *prefix, int kernel);
static void NCR53c7xx_dsa_fixup (struct NCR53c7x0_cmd *cmd);
static void NCR53c7x0_init_fixup (struct Scsi_Host *host);
static int NCR53c7x0_dstat_sir_intr (struct Scsi_Host *host, struct
NCR53c7x0_cmd *cmd);
static void NCR53c7x0_soft_reset (struct Scsi_Host *host);
/* Size of event list (per host adapter) */
static int track_events = 0;
static struct Scsi_Host *first_host = NULL; /* Head of list of NCR boards */
static struct scsi_host_template *the_template = NULL;
/* NCR53c710 script handling code */
#include "53c7xx_d.h"
#ifdef A_int_debug_sync
#define DEBUG_SYNC_INTR A_int_debug_sync
#endif
int NCR53c7xx_script_len = sizeof (SCRIPT);
int NCR53c7xx_dsa_len = A_dsa_end + Ent_dsa_zero - Ent_dsa_code_template;
#ifdef FORCE_DSA_ALIGNMENT
int CmdPageStart = (0 - Ent_dsa_zero - sizeof(struct NCR53c7x0_cmd)) & 0xff;
#endif
static char *setup_strings[] =
{"","","","","","","",""};
#define MAX_SETUP_STRINGS (sizeof(setup_strings) / sizeof(char *))
#define SETUP_BUFFER_SIZE 200
static char setup_buffer[SETUP_BUFFER_SIZE];
static char setup_used[MAX_SETUP_STRINGS];
void ncr53c7xx_setup (char *str, int *ints)
{
int i;
char *p1, *p2;
p1 = setup_buffer;
*p1 = '\0';
if (str)
strncpy(p1, str, SETUP_BUFFER_SIZE - strlen(setup_buffer));
setup_buffer[SETUP_BUFFER_SIZE - 1] = '\0';
p1 = setup_buffer;
i = 0;
while (*p1 && (i < MAX_SETUP_STRINGS)) {
p2 = strchr(p1, ',');
if (p2) {
*p2 = '\0';
if (p1 != p2)
setup_strings[i] = p1;
p1 = p2 + 1;
i++;
}
else {
setup_strings[i] = p1;
break;
}
}
for (i=0; i<MAX_SETUP_STRINGS; i++)
setup_used[i] = 0;
}
/* check_setup_strings() returns index if key found, 0 if not
*/
static int check_setup_strings(char *key, int *flags, int *val, char *buf)
{
int x;
char *cp;
for (x=0; x<MAX_SETUP_STRINGS; x++) {
if (setup_used[x])
continue;
if (!strncmp(setup_strings[x], key, strlen(key)))
break;
if (!strncmp(setup_strings[x], "next", strlen("next")))
return 0;
}
if (x == MAX_SETUP_STRINGS)
return 0;
setup_used[x] = 1;
cp = setup_strings[x] + strlen(key);
*val = -1;
if (*cp != ':')
return ++x;
cp++;
if ((*cp >= '0') && (*cp <= '9')) {
*val = simple_strtoul(cp,NULL,0);
}
return ++x;
}
/*
* KNOWN BUGS :
* - There is some sort of conflict when the PPP driver is compiled with
* support for 16 channels?
*
* - On systems which predate the 1.3.x initialization order change,
* the NCR driver will cause Cannot get free page messages to appear.
* These are harmless, but I don't know of an easy way to avoid them.
*
* - With OPTION_DISCONNECT, on two systems under unknown circumstances,
* we get a PHASE MISMATCH with DSA set to zero (suggests that we
* are occurring somewhere in the reselection code) where
* DSP=some value DCMD|DBC=same value.
*
* Closer inspection suggests that we may be trying to execute
* some portion of the DSA?
* scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
* scsi0 : handling residual transfer (+ 0 bytes from DMA FIFO)
* scsi0 : no current command : unexpected phase MSGIN.
* DSP=0x1c46cc, DCMD|DBC=0x1c46ac, DSA=0x0
* DSPS=0x0, TEMP=0x1c3e70, DMODE=0x80
* scsi0 : DSP->
* 001c46cc : 0x001c46cc 0x00000000
* 001c46d4 : 0x001c5ea0 0x000011f8
*
* Changed the print code in the phase_mismatch handler so
* that we call print_lots to try to diagnose this.
*
*/
/*
* Possible future direction of architecture for max performance :
*
* We're using a single start array for the NCR chip. This is
* sub-optimal, because we cannot add a command which would conflict with
* an executing command to this start queue, and therefore must insert the
* next command for a given I/T/L combination after the first has completed;
* incurring our interrupt latency between SCSI commands.
*
* To allow further pipelining of the NCR and host CPU operation, we want
* to set things up so that immediately on termination of a command destined
* for a given LUN, we get that LUN busy again.
*
* To do this, we need to add a 32 bit pointer to which is jumped to
* on completion of a command. If no new command is available, this
* would point to the usual DSA issue queue select routine.
*
* If one were, it would point to a per-NCR53c7x0_cmd select routine
* which starts execution immediately, inserting the command at the head
* of the start queue if the NCR chip is selected or reselected.
*
* We would change so that we keep a list of outstanding commands
* for each unit, rather than a single running_list. We'd insert
* a new command into the right running list; if the NCR didn't
* have something running for that yet, we'd put it in the
* start queue as well. Some magic needs to happen to handle the
* race condition between the first command terminating before the
* new one is written.
*
* Potential for profiling :
* Call do_gettimeofday(struct timeval *tv) to get 800ns resolution.
*/
/*
* TODO :
* 1. To support WIDE transfers, not much needs to happen. We
* should do CHMOVE instructions instead of MOVEs when
* we have scatter/gather segments of uneven length. When
* we do this, we need to handle the case where we disconnect
* between segments.
*
* 2. Currently, when Icky things happen we do a FATAL(). Instead,
* we want to do an integrity check on the parts of the NCR hostdata
* structure which were initialized at boot time; FATAL() if that
* fails, and otherwise try to recover. Keep track of how many
* times this has happened within a single SCSI command; if it
* gets excessive, then FATAL().
*
* 3. Parity checking is currently disabled, and a few things should
* happen here now that we support synchronous SCSI transfers :
* 1. On soft-reset, we shoould set the EPC (Enable Parity Checking)
* and AAP (Assert SATN/ on parity error) bits in SCNTL0.
*
* 2. We should enable the parity interrupt in the SIEN0 register.
*
* 3. intr_phase_mismatch() needs to believe that message out is
* always an "acceptable" phase to have a mismatch in. If
* the old phase was MSG_IN, we should send a MESSAGE PARITY
* error. If the old phase was something else, we should send
* a INITIATOR_DETECTED_ERROR message. Note that this could
* cause a RESTORE POINTERS message; so we should handle that
* correctly first. Instead, we should probably do an
* initiator_abort.
*
* 4. MPEE bit of CTEST4 should be set so we get interrupted if
* we detect an error.
*
*
* 5. The initial code has been tested on the NCR53c810. I don't
* have access to NCR53c700, 700-66 (Forex boards), NCR53c710
* (NCR Pentium systems), NCR53c720, NCR53c820, or NCR53c825 boards to
* finish development on those platforms.
*
* NCR53c820/825/720 - need to add wide transfer support, including WDTR
* negotiation, programming of wide transfer capabilities
* on reselection and table indirect selection.
*
* NCR53c710 - need to add fatal interrupt or GEN code for
* command completion signaling. Need to modify all
* SDID, SCID, etc. registers, and table indirect select code
* since these use bit fielded (ie 1<<target) instead of
* binary encoded target ids. Need to accommodate
* different register mappings, probably scan through
* the SCRIPT code and change the non SFBR register operand
* of all MOVE instructions.
*
* It is rather worse than this actually, the 710 corrupts
* both TEMP and DSA when you do a MOVE MEMORY. This
* screws you up all over the place. MOVE MEMORY 4 with a
* destination of DSA seems to work OK, which helps some.
* Richard Hirst richard@sleepie.demon.co.uk
*
* NCR53c700/700-66 - need to add code to refix addresses on
* every nexus change, eliminate all table indirect code,
* very messy.
*
* 6. The NCR53c7x0 series is very popular on other platforms that
* could be running Linux - ie, some high performance AMIGA SCSI
* boards use it.
*
* So, I should include #ifdef'd code so that it is
* compatible with these systems.
*
* Specifically, the little Endian assumptions I made in my
* bit fields need to change, and if the NCR doesn't see memory
* the right way, we need to provide options to reverse words
* when the scripts are relocated.
*
* 7. Use vremap() to access memory mapped boards.
*/
/*
* Allow for simultaneous existence of multiple SCSI scripts so we
* can have a single driver binary for all of the family.
*
* - one for NCR53c700 and NCR53c700-66 chips (not yet supported)
* - one for rest (only the NCR53c810, 815, 820, and 825 are currently
* supported)
*
* So that we only need two SCSI scripts, we need to modify things so
* that we fixup register accesses in READ/WRITE instructions, and
* we'll also have to accommodate the bit vs. binary encoding of IDs
* with the 7xx chips.
*/
#define ROUNDUP(adr,type) \
((void *) (((long) (adr) + sizeof(type) - 1) & ~(sizeof(type) - 1)))
/*
* Function: issue_to_cmd
*
* Purpose: convert jump instruction in issue array to NCR53c7x0_cmd
* structure pointer.
*
* Inputs; issue - pointer to start of NOP or JUMP instruction
* in issue array.
*
* Returns: pointer to command on success; 0 if opcode is NOP.
*/
static inline struct NCR53c7x0_cmd *
issue_to_cmd (struct Scsi_Host *host, struct NCR53c7x0_hostdata *hostdata,
u32 *issue)
{
return (issue[0] != hostdata->NOP_insn) ?
/*
* If the IF TRUE bit is set, it's a JUMP instruction. The
* operand is a bus pointer to the dsa_begin routine for this DSA. The
* dsa field of the NCR53c7x0_cmd structure starts with the
* DSA code template. By converting to a virtual address,
* subtracting the code template size, and offset of the
* dsa field, we end up with a pointer to the start of the
* structure (alternatively, we could use the
* dsa_cmnd field, an anachronism from when we weren't
* sure what the relationship between the NCR structures
* and host structures were going to be.
*/
(struct NCR53c7x0_cmd *) ((char *) bus_to_virt (issue[1]) -
(hostdata->E_dsa_code_begin - hostdata->E_dsa_code_template) -
offsetof(struct NCR53c7x0_cmd, dsa))
/* If the IF TRUE bit is not set, it's a NOP */
: NULL;
}
/*
* FIXME: we should junk these, in favor of synchronous_want and
* wide_want in the NCR53c7x0_hostdata structure.
*/
/* Template for "preferred" synchronous transfer parameters. */
static const unsigned char sdtr_message[] = {
#ifdef CONFIG_SCSI_NCR53C7xx_FAST
EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 25 /* *4ns */, 8 /* off */
#else
EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 50 /* *4ns */, 8 /* off */
#endif
};
/* Template to request asynchronous transfers */
static const unsigned char async_message[] = {
EXTENDED_MESSAGE, 3 /* length */, EXTENDED_SDTR, 0, 0 /* asynchronous */
};
/* Template for "preferred" WIDE transfer parameters */
static const unsigned char wdtr_message[] = {
EXTENDED_MESSAGE, 2 /* length */, EXTENDED_WDTR, 1 /* 2^1 bytes */
};
#if 0
/*
* Function : struct Scsi_Host *find_host (int host)
*
* Purpose : KGDB support function which translates a host number
* to a host structure.
*
* Inputs : host - number of SCSI host
*
* Returns : NULL on failure, pointer to host structure on success.
*/
static struct Scsi_Host *
find_host (int host) {
struct Scsi_Host *h;
for (h = first_host; h && h->host_no != host; h = h->next);
if (!h) {
printk (KERN_ALERT "scsi%d not found\n", host);
return NULL;
} else if (h->hostt != the_template) {
printk (KERN_ALERT "scsi%d is not a NCR board\n", host);
return NULL;
}
return h;
}
#if 0
/*
* Function : request_synchronous (int host, int target)
*
* Purpose : KGDB interface which will allow us to negotiate for
* synchronous transfers. This ill be replaced with a more
* integrated function; perhaps a new entry in the scsi_host
* structure, accessible via an ioctl() or perhaps /proc/scsi.
*
* Inputs : host - number of SCSI host; target - number of target.
*
* Returns : 0 when negotiation has been setup for next SCSI command,
* -1 on failure.
*/
static int
request_synchronous (int host, int target) {
struct Scsi_Host *h;
struct NCR53c7x0_hostdata *hostdata;
unsigned long flags;
if (target < 0) {
printk (KERN_ALERT "target %d is bogus\n", target);
return -1;
}
if (!(h = find_host (host)))
return -1;
else if (h->this_id == target) {
printk (KERN_ALERT "target %d is host ID\n", target);
return -1;
}
else if (target > h->max_id) {
printk (KERN_ALERT "target %d exceeds maximum of %d\n", target,
h->max_id);
return -1;
}
hostdata = (struct NCR53c7x0_hostdata *)h->hostdata[0];
local_irq_save(flags);
if (hostdata->initiate_sdtr & (1 << target)) {
local_irq_restore(flags);
printk (KERN_ALERT "target %d already doing SDTR\n", target);
return -1;
}
hostdata->initiate_sdtr |= (1 << target);
local_irq_restore(flags);
return 0;
}
#endif
/*
* Function : request_disconnect (int host, int on_or_off)
*
* Purpose : KGDB support function, tells us to allow or disallow
* disconnections.
*
* Inputs : host - number of SCSI host; on_or_off - non-zero to allow,
* zero to disallow.
*
* Returns : 0 on success, * -1 on failure.
*/
static int
request_disconnect (int host, int on_or_off) {
struct Scsi_Host *h;
struct NCR53c7x0_hostdata *hostdata;
if (!(h = find_host (host)))
return -1;
hostdata = (struct NCR53c7x0_hostdata *) h->hostdata[0];
if (on_or_off)
hostdata->options |= OPTION_DISCONNECT;
else
hostdata->options &= ~OPTION_DISCONNECT;
return 0;
}
#endif
/*
* Function : static void NCR53c7x0_driver_init (struct Scsi_Host *host)
*
* Purpose : Initialize internal structures, as required on startup, or
* after a SCSI bus reset.
*
* Inputs : host - pointer to this host adapter's structure
*/
static void
NCR53c7x0_driver_init (struct Scsi_Host *host) {
struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
host->hostdata[0];
int i, j;
u32 *ncrcurrent;
for (i = 0; i < 16; ++i) {
hostdata->request_sense[i] = 0;
for (j = 0; j < 8; ++j)
hostdata->busy[i][j] = 0;
set_synchronous (host, i, /* sxfer */ 0, hostdata->saved_scntl3, 0);
}
hostdata->issue_queue = NULL;
hostdata->running_list = hostdata->finished_queue =
hostdata->ncrcurrent = NULL;
for (i = 0, ncrcurrent = (u32 *) hostdata->schedule;
i < host->can_queue; ++i, ncrcurrent += 2) {
ncrcurrent[0] = hostdata->NOP_insn;
ncrcurrent[1] = 0xdeadbeef;
}
ncrcurrent[0] = ((DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24) | DBC_TCI_TRUE;
ncrcurrent[1] = (u32) virt_to_bus (hostdata->script) +
hostdata->E_wait_reselect;
hostdata->reconnect_dsa_head = 0;
hostdata->addr_reconnect_dsa_head = (u32)
virt_to_bus((void *) &(hostdata->reconnect_dsa_head));
hostdata->expecting_iid = 0;
hostdata->expecting_sto = 0;
if (hostdata->options & OPTION_ALWAYS_SYNCHRONOUS)
hostdata->initiate_sdtr = 0xffff;
else
hostdata->initiate_sdtr = 0;
hostdata->talked_to = 0;
hostdata->idle = 1;
}
/*
* Function : static int clock_to_ccf_710 (int clock)
*
* Purpose : Return the clock conversion factor for a given SCSI clock.
*
* Inputs : clock - SCSI clock expressed in Hz.
*
* Returns : ccf on success, -1 on failure.
*/
static int
clock_to_ccf_710 (int clock) {
if (clock <= 16666666)
return -1;
if (clock <= 25000000)
return 2; /* Divide by 1.0 */
else if (clock <= 37500000)
return 1; /* Divide by 1.5 */
else if (clock <= 50000000)
return 0; /* Divide by 2.0 */
else if (clock <= 66000000)
return 3; /* Divide by 3.0 */
else
return -1;
}
/*
* Function : static int NCR53c7x0_init (struct Scsi_Host *host)
*
* Purpose : initialize the internal structures for a given SCSI host
*
* Inputs : host - pointer to this host adapter's structure
*
* Preconditions : when this function is called, the chip_type
* field of the hostdata structure MUST have been set.
*
* Returns : 0 on success, -1 on failure.
*/
int
NCR53c7x0_init (struct Scsi_Host *host) {
NCR53c7x0_local_declare();
int i, ccf;
unsigned char revision;
struct NCR53c7x0_hostdata *hostdata = (struct NCR53c7x0_hostdata *)
host->hostdata[0];
/*
* There are some things which we need to know about in order to provide
* a semblance of support. Print 'em if they aren't what we expect,
* otherwise don't add to the noise.
*
* -1 means we don't know what to expect.
*/
int val, flags;
char buf[32];
int expected_id = -1;
int expected_clock = -1;
int uninitialized = 0;
#ifdef NO_IO_SPACE
int expected_mapping = OPTION_MEMORY_MAPPED;
#else
int expected_mapping = OPTION_IO_MAPPED;
#endif
for (i=0;i<7;i++)
hostdata->valid_ids[i] = 1; /* Default all ID's to scan */
/* Parse commandline flags */
if (check_setup_strings("noasync",&flags,&val,buf))
{
hostdata->options |= OPTION_NO_ASYNC;
hostdata->options &= ~(OPTION_SYNCHRONOUS | OPTION_ALWAYS_SYNCHRONOUS);
}
if (check_setup_strings("nosync",&flags,&val,buf))
{
hostdata->options &= ~(OPTION_SYNCHRONOUS | OPTION_ALWAYS_SYNCHRONOUS);
}
if (check_setup_strings("nodisconnect",&flags,&val,buf))
hostdata->options &= ~OPTION_DISCONNECT;
if (check_setup_strings("validids",&flags,&val,buf))
{
for (i=0;i<7;i++)
hostdata->valid_ids[i] = val & (1<<i);
}
if ((i = check_setup_strings("next",&flags,&val,buf)))
{
while (i)
setup_used[--i] = 1;
}
if (check_setup_strings("opthi",&flags,&val,buf))
hostdata->options = (long long)val << 32;
if (check_setup_strings("optlo",&flags,&val,buf))
hostdata->options |= val;
NCR53c7x0_local_setup(host);
switch (hostdata->chip) {
case 710:
case 770:
hostdata->dstat_sir_intr = NCR53c7x0_dstat_sir_intr;
hostdata->init_save_regs = NULL;
hostdata->dsa_fixup = NCR53c7xx_dsa_fixup;
hostdata->init_fixup = NCR53c7x0_init_fixup;
hostdata->soft_reset = NCR53c7x0_soft_reset;
hostdata->run_tests = NCR53c7xx_run_tests;
expected_clock = hostdata->scsi_clock;
expected_id = 7;
break;
default:
printk ("scsi%d : chip type of %d is not supported yet, detaching.\n",
host->host_no, hostdata->chip);
scsi_unregister (host);
return -1;
}
/* Assign constants accessed by NCR */
hostdata->NCR53c7xx_zero = 0;
hostdata->NCR53c7xx_msg_reject = MESSAGE_REJECT;
hostdata->NCR53c7xx_msg_abort = ABORT;
hostdata->NCR53c7xx_msg_nop = NOP;
hostdata->NOP_insn = (DCMD_TYPE_TCI|DCMD_TCI_OP_JUMP) << 24;
if (expected_mapping == -1 ||
(hostdata->options & (OPTION_MEMORY_MAPPED)) !=
(expected_mapping & OPTION_MEMORY_MAPPED))
printk ("scsi%d : using %s mapped access\n", host->host_no,
(hostdata->options & OPTION_MEMORY_MAPPED) ? "memory" :
"io");
hostdata->dmode = (hostdata->chip == 700 || hostdata->chip == 70066) ?
DMODE_REG_00 : DMODE_REG_10;
hostdata->istat = ((hostdata->chip / 100) == 8) ?
ISTAT_REG_800 : ISTAT_REG_700;
/* We have to assume that this may be the first access to the chip, so
* we must set EA in DCNTL. */
NCR53c7x0_write8 (DCNTL_REG, DCNTL_10_EA|DCNTL_10_COM);
/* Only the ISTAT register is readable when the NCR is running, so make
sure it's halted. */
ncr_halt(host);
/*
* XXX - the NCR53c700 uses bitfielded registers for SCID, SDID, etc,
* as does the 710 with one bit per SCSI ID. Conversely, the NCR
* uses a normal, 3 bit binary representation of these values.
*
* Get the rest of the NCR documentation, and FIND OUT where the change
* was.
*/
#if 0
/* May not be able to do this - chip my not have been set up yet */
tmp = hostdata->this_id_mask = NCR53c7x0_read8(SCID_REG);
for (host->this_id = 0; tmp != 1; tmp >>=1, ++host->this_id);
#else
host->this_id = 7;
#endif
/*
* Note : we should never encounter a board setup for ID0. So,
* if we see ID0, assume that it was uninitialized and set it
* to the industry standard 7.
*/
if (!host->this_id) {
printk("scsi%d : initiator ID was %d, changing to 7\n",
host->host_no, host->this_id);
host->this_id = 7;
hostdata->this_id_mask = 1 << 7;
uninitialized = 1;
};
if (expected_id == -1 || host->this_id != expected_id)
printk("scsi%d : using initiator ID %d\n", host->host_no,
host->this_id);
/*
* Save important registers to allow a soft reset.
*/
/*
* CTEST7 controls cache snooping, burst mode, and support for
* external differential drivers. This isn't currently used - the
* default value may not be optimal anyway.
* Even worse, it may never have been set up since reset.
*/
hostdata->saved_ctest7 = NCR53c7x0_read8(CTEST7_REG) & CTEST7_SAVE;
revision = (NCR53c7x0_read8(CTEST8_REG) & 0xF0) >> 4;
switch (revision) {
case 1: revision = 0; break;
case 2: revision = 1; break;
case 4: revision = 2; break;
case 8: revision = 3; break;
default: revision = 255; break;