diff options
Diffstat (limited to 'drivers/scsi/53c7xx.c')
| -rw-r--r-- | drivers/scsi/53c7xx.c | 6102 |
1 files changed, 0 insertions, 6102 deletions
diff --git a/drivers/scsi/53c7xx.c b/drivers/scsi/53c7xx.c deleted file mode 100644 index 93b41f45638..00000000000 --- a/drivers/scsi/53c7xx.c +++ /dev/null @@ -1,6102 +0,0 @@ -/* - * 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/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 <scsi/scsi_transport_spi.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); -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 ARRAY_SIZE(setup_strings) -#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; - } - printk("scsi%d: Revision 0x%x\n",host->host_no,revision); - - if ((revision == 0 || revision == 255) && (hostdata->options & (OPTION_SYNCHRONOUS|OPTION_DISCONNECT|OPTION_ALWAYS_SYNCHRONOUS))) - { - printk ("scsi%d: Disabling sync working and disconnect/reselect\n", - host->host_no); - hostdata->options &= ~(OPTION_SYNCHRONOUS|OPTION_DISCONNECT|OPTION_ALWAYS_SYNCHRONOUS); - } - - /* - * On NCR53c700 series chips, DCNTL controls the SCSI clock divisor, - * on 800 series chips, it allows for a totem-pole IRQ driver. - * NOTE saved_dcntl currently overwritten in init function. - * The value read here may be garbage anyway, MVME16x board at least - * does not initialise chip if kernel arrived via tftp. - */ - - hostdata->saved_dcntl = NCR53c7x0_read8(DCNTL_REG); - - /* - * DMODE controls DMA burst length, and on 700 series chips, - * 286 mode and bus width - * NOTE: On MVME16x, chip may have been reset, so this could be a - * power-on/reset default value. - */ - hostdata->saved_dmode = NCR53c7x0_read8(hostdata->dmode); - - /* - * Now that burst length and enabled/disabled status is known, - * clue the user in on it. - */ - - ccf = clock_to_ccf_710 (expected_clock); - - for (i = 0; i < 16; ++i) - hostdata->cmd_allocated[i] = 0; - - if (hostdata->init_save_regs) - hostdata->init_save_regs (host); - if (hostdata->init_fixup) - hostdata->init_fixup (host); - - if (!the_template) { - the_template = host->hostt; - first_host = host; - } - - /* - * Linux SCSI drivers have always been plagued with initialization - * problems - some didn't work with the BIOS disabled since they expected - * initialization from it, some didn't work when the networking code - |