/* NCR53C9x.c: Generic SCSI driver code for NCR53C9x chips. * * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) * * Most DMA dependencies put in driver specific files by * Jesper Skov (jskov@cygnus.co.uk) * * Set up to use GETREG/SETREG (preprocessor macros in NCR53c9x.h) by * Tymm Twillman (tymm@coe.missouri.edu) */ /* TODO: * * 1) Maybe disable parity checking in config register one for SCSI1 * targets. (Gilmore says parity error on the SBus can lock up * old sun4c's) * 2) Add support for DMA2 pipelining. * 3) Add tagged queueing. * 4) Maybe change use of "esp" to something more "NCR"'ish. */ #include #include #include #include #include #include #include #include #include #include #include "scsi.h" #include "hosts.h" #include "NCR53C9x.h" #ifdef CONFIG_SCSI_SUNESP #include "sparc_esp.h" #include #include #include #include #include #endif #if defined(CONFIG_BLZ1230_SCSI)||defined(CONFIG_BLZ2060_SCSI)||defined(CONFIG_CYBERSTORMII_SCSI) #define SYMBIOS_HACK #else #undef SYMBIOS_HACK #endif #include #include #include #include #include /* Command phase enumeration. */ enum { not_issued = 0x00, /* Still in the issue_SC queue. */ /* Various forms of selecting a target. */ #define in_slct_mask 0x10 in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ in_slct_msg = 0x12, /* select, then send a message */ in_slct_tag = 0x13, /* select and send tagged queue msg */ in_slct_sneg = 0x14, /* select and acquire sync capabilities */ /* Any post selection activity. */ #define in_phases_mask 0x20 in_datain = 0x20, /* Data is transferring from the bus */ in_dataout = 0x21, /* Data is transferring to the bus */ in_data_done = 0x22, /* Last DMA data operation done (maybe) */ in_msgin = 0x23, /* Eating message from target */ in_msgincont = 0x24, /* Eating more msg bytes from target */ in_msgindone = 0x25, /* Decide what to do with what we got */ in_msgout = 0x26, /* Sending message to target */ in_msgoutdone = 0x27, /* Done sending msg out */ in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ in_cmdend = 0x29, /* Done sending slow cmd */ in_status = 0x2a, /* Was in status phase, finishing cmd */ in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ in_the_dark = 0x2c, /* Don't know what bus phase we are in */ /* Special states, ie. not normal bus transitions... */ #define in_spec_mask 0x80 in_abortone = 0x80, /* Aborting one command currently */ in_abortall = 0x81, /* Blowing away all commands we have */ in_resetdev = 0x82, /* SCSI target reset in progress */ in_resetbus = 0x83, /* SCSI bus reset in progress */ in_tgterror = 0x84, /* Target did something stupid */ }; struct proc_dir_entry proc_scsi_esp = { PROC_SCSI_ESP, 3, "esp", S_IFDIR | S_IRUGO | S_IXUGO, 2 }; /* The master ring of all esp hosts we are managing in this driver. */ struct NCR_ESP *espchain = 0; int nesps = 0, esps_in_use = 0, esps_running = 0; void esp_intr(int irq, void *dev_id, struct pt_regs *pregs); /* Debugging routines */ struct esp_cmdstrings { unchar cmdchar; char *text; } esp_cmd_strings[] = { /* Miscellaneous */ { ESP_CMD_NULL, "ESP_NOP", }, { ESP_CMD_FLUSH, "FIFO_FLUSH", }, { ESP_CMD_RC, "RSTESP", }, { ESP_CMD_RS, "RSTSCSI", }, /* Disconnected State Group */ { ESP_CMD_RSEL, "RESLCTSEQ", }, { ESP_CMD_SEL, "SLCTNATN", }, { ESP_CMD_SELA, "SLCTATN", }, { ESP_CMD_SELAS, "SLCTATNSTOP", }, { ESP_CMD_ESEL, "ENSLCTRESEL", }, { ESP_CMD_DSEL, "DISSELRESEL", }, { ESP_CMD_SA3, "SLCTATN3", }, { ESP_CMD_RSEL3, "RESLCTSEQ", }, /* Target State Group */ { ESP_CMD_SMSG, "SNDMSG", }, { ESP_CMD_SSTAT, "SNDSTATUS", }, { ESP_CMD_SDATA, "SNDDATA", }, { ESP_CMD_DSEQ, "DISCSEQ", }, { ESP_CMD_TSEQ, "TERMSEQ", }, { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, { ESP_CMD_DCNCT, "DISC", }, { ESP_CMD_RMSG, "RCVMSG", }, { ESP_CMD_RCMD, "RCVCMD", }, { ESP_CMD_RDATA, "RCVDATA", }, { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, /* Initiator State Group */ { ESP_CMD_TI, "TRANSINFO", }, { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, { ESP_CMD_MOK, "MSGACCEPTED", }, { ESP_CMD_TPAD, "TPAD", }, { ESP_CMD_SATN, "SATN", }, { ESP_CMD_RATN, "RATN", }, }; #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) /* Print textual representation of an ESP command */ static inline void esp_print_cmd(unchar espcmd) { unchar dma_bit = espcmd & ESP_CMD_DMA; int i; espcmd &= ~dma_bit; for(i=0; i"); } /* Print the interrupt register's value */ static inline void esp_print_ireg(unchar intreg) { printk("INTREG< "); if(intreg & ESP_INTR_S) printk("SLCT_NATN "); if(intreg & ESP_INTR_SATN) printk("SLCT_ATN "); if(intreg & ESP_INTR_RSEL) printk("RSLCT "); if(intreg & ESP_INTR_FDONE) printk("FDONE "); if(intreg & ESP_INTR_BSERV) printk("BSERV "); if(intreg & ESP_INTR_DC) printk("DISCNCT "); if(intreg & ESP_INTR_IC) printk("ILL_CMD "); if(intreg & ESP_INTR_SR) printk("SCSI_BUS_RESET "); printk(">"); } /* Print the sequence step registers contents */ static inline void esp_print_seqreg(unchar stepreg) { stepreg &= ESP_STEP_VBITS; printk("STEP<%s>", (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : "UNKNOWN")))))); } #if defined(DEBUG_STATE_MACHINE) || defined(DEBUG_ESP) static char *phase_string(int phase) { switch(phase) { case not_issued: return "UNISSUED"; case in_slct_norm: return "SLCTNORM"; case in_slct_stop: return "SLCTSTOP"; case in_slct_msg: return "SLCTMSG"; case in_slct_tag: return "SLCTTAG"; case in_slct_sneg: return "SLCTSNEG"; case in_datain: return "DATAIN"; case in_dataout: return "DATAOUT"; case in_data_done: return "DATADONE"; case in_msgin: return "MSGIN"; case in_msgincont: return "MSGINCONT"; case in_msgindone: return "MSGINDONE"; case in_msgout: return "MSGOUT"; case in_msgoutdone: return "MSGOUTDONE"; case in_cmdbegin: return "CMDBEGIN"; case in_cmdend: return "CMDEND"; case in_status: return "STATUS"; case in_freeing: return "FREEING"; case in_the_dark: return "CLUELESS"; case in_abortone: return "ABORTONE"; case in_abortall: return "ABORTALL"; case in_resetdev: return "RESETDEV"; case in_resetbus: return "RESETBUS"; case in_tgterror: return "TGTERROR"; default: return "UNKNOWN"; }; } #endif static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase) { #ifdef DEBUG_STATE_MACHINE ESPLOG(("<%s>", phase_string(newphase))); #endif s->SCp.sent_command = s->SCp.phase; s->SCp.phase = newphase; } extern inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs, unchar cmd) { #ifdef DEBUG_ESP_CMDS esp->espcmdlog[esp->espcmdent] = cmd; esp->espcmdent = (esp->espcmdent + 1) & 31; #endif SETREG(eregs->esp_cmnd, cmd); } /* How we use the various Linux SCSI data structures for operation. * * struct scsi_cmnd: * * We keep track of the syncronous capabilities of a target * in the device member, using sync_min_period and * sync_max_offset. These are the values we directly write * into the ESP registers while running a command. If offset * is zero the ESP will use asynchronous transfers. * If the borken flag is set we assume we shouldn't even bother * trying to negotiate for synchronous transfer as this target * is really stupid. If we notice the target is dropping the * bus, and we have been allowing it to disconnect, we clear * the disconnect flag. */ /* Manipulation of the ESP command queues. Thanks to the aha152x driver * and its author, Juergen E. Fischer, for the methods used here. * Note that these are per-ESP queues, not global queues like * the aha152x driver uses. */ static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) { Scsi_Cmnd *end; unsigned long flags; save_flags(flags); cli(); new_SC->host_scribble = (unsigned char *) NULL; if(!*SC) *SC = new_SC; else { for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble) ; end->host_scribble = (unsigned char *) new_SC; } restore_flags(flags); } static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) { unsigned long flags; save_flags(flags); cli(); new_SC->host_scribble = (unsigned char *) *SC; *SC = new_SC; restore_flags(flags); } static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC) { Scsi_Cmnd *ptr; unsigned long flags; save_flags(flags); cli(); ptr = *SC; if(ptr) *SC = (Scsi_Cmnd *) (*SC)->host_scribble; restore_flags(flags); return ptr; } static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun) { Scsi_Cmnd *ptr, *prev; unsigned long flags; save_flags(flags); cli(); for(ptr = *SC, prev = NULL; ptr && ((ptr->target != target) || (ptr->lun != lun)); prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble) ; if(ptr) { if(prev) prev->host_scribble=ptr->host_scribble; else *SC=(Scsi_Cmnd *)ptr->host_scribble; } restore_flags(flags); return ptr; } /* Resetting various pieces of the ESP scsi driver chipset */ /* Reset the ESP chip, _not_ the SCSI bus. */ static inline void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs) { int family_code, version, i; volatile int trash; /* Now reset the ESP chip */ esp_cmd(esp, eregs, ESP_CMD_RC); esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); /* This is the only point at which it is reliable to read * the ID-code for a fast ESP chip variant. */ esp->max_period = ((35 * esp->ccycle) / 1000); if(esp->erev == fast) { version = GETREG(eregs->esp_uid); family_code = (version & 0xf8) >> 3; #ifdef SYMBIOS_HACK if (version == 0 && family_code == 0) { printk ("Detected SymBIOS chip with no family code.\n"); version = 3; family_code = 2; } #endif if(family_code == 0x02) if ((version & 7) == 2) esp->erev = fas216; else esp->erev = fas236; else if(family_code == 0x0a) esp->erev = fashme; /* Version is usually '5'. */ else esp->erev = fas100a; printk("esp%d: FAST chip is %s (family=%d, version=%d)\n", esp->esp_id, (esp->erev == fas236) ? "fas236" : ((esp->erev == fas216) ? "fas216" : (((esp->erev == fas100a) ? "fas100a" : "fasHME"))), family_code, (version & 7)); esp->min_period = ((4 * esp->ccycle) / 1000); } else { esp->min_period = ((5 * esp->ccycle) / 1000); } /* Reload the configuration registers */ SETREG(eregs->esp_cfact, esp->cfact); SETREG(eregs->esp_stp, 0); SETREG(eregs->esp_soff, 0); SETREG(eregs->esp_timeo, esp->neg_defp); esp->max_period = (esp->max_period + 3)>>2; esp->min_period = (esp->min_period + 3)>>2; SETREG(eregs->esp_cfg1, esp->config1); switch(esp->erev) { case esp100: /* nothing to do */ break; case esp100a: SETREG(eregs->esp_cfg2, esp->config2); break; case esp236: /* Slow 236 */ SETREG(eregs->esp_cfg2, esp->config2); SETREG(eregs->esp_cfg3, esp->config3[0]); break; case fashme: esp->config2 |= (ESP_CONFIG2_HME32 | ESP_CONFIG2_HMEFENAB); /* fallthrough... */ case fas216: case fas236: /* Fast 236 or HME */ SETREG(eregs->esp_cfg2, esp->config2); for(i=0; i<8; i++) { if(esp->erev == fashme) esp->config3[i] |= (ESP_CONFIG3_FCLOCK | ESP_CONFIG3_BIGID | ESP_CONFIG3_OBPUSH); else esp->config3[i] |= ESP_CONFIG3_FCLK; } SETREG(eregs->esp_cfg3, esp->config3[0]); if(esp->erev == fashme) { esp->radelay = 80; } else { if(esp->diff) esp->radelay = 0; else esp->radelay = 96; } break; case fas100a: /* Fast 100a */ SETREG(eregs->esp_cfg2, esp->config2); for(i=0; i<8; i++) esp->config3[i] |= ESP_CONFIG3_FCLOCK; SETREG(eregs->esp_cfg3, esp->config3[0]); esp->radelay = 32; break; default: panic("esp: what could it be... I wonder..."); break; }; /* Eat any bitrot in the chip */ trash = GETREG(eregs->esp_intrpt); udelay(100); } /* This places the ESP into a known state at boot time. */ inline void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs) { volatile unchar trash; /* Reset the DMA */ if(esp->dma_reset) esp->dma_reset(esp); /* Reset the ESP */ esp_reset_esp(esp, eregs); /* Reset the SCSI bus, but tell ESP not to generate an irq */ SETREG(eregs->esp_cfg1, GETREG(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB); esp_cmd(esp, eregs, ESP_CMD_RS); udelay(400); SETREG(eregs->esp_cfg1, esp->config1); /* Eat any bitrot in the chip and we are done... */ trash = GETREG(eregs->esp_intrpt); } /* Allocate structure and insert basic data such as SCSI chip frequency * data and a pointer to the device */ struct NCR_ESP* esp_allocate(Scsi_Host_Template *tpnt, void *esp_dev) { struct NCR_ESP *esp, *elink; struct Scsi_Host *esp_host; esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP)); if(!esp_host) panic("Cannot register ESP SCSI host"); esp = (struct NCR_ESP *) esp_host->hostdata; if(!esp) panic("No esp in hostdata"); esp->ehost = esp_host; esp->edev = esp_dev; esp->esp_id = nesps++; /* Put into the chain of esp chips detected */ if(espchain) { elink = espchain; while(elink->next) elink = elink->next; elink->next = esp; } else { espchain = esp; } esp->next = 0; return esp; } /* Complete initialization of ESP structure and device * Caller must have initialized appropriate parts of the ESP structure * between the call to esp_allocate and this function. */ void esp_initialize(struct NCR_ESP *esp) { struct ESP_regs *eregs = esp->eregs; unsigned int fmhz; unchar ccf; int i; /* Check out the clock properties of the chip. */ /* This is getting messy but it has to be done * correctly or else you get weird behavior all * over the place. We are trying to basically * figure out three pieces of information. * * a) Clock Conversion Factor * * This is a representation of the input * crystal clock frequency going into the * ESP on this machine. Any operation whose * timing is longer than 400ns depends on this * value being correct. For example, you'll * get blips for arbitration/selection during * high load or with multiple targets if this * is not set correctly. * * b) Selection Time-Out * * The ESP isn't very bright and will arbitrate * for the bus and try to select a target * forever if you let it. This value tells * the ESP when it has taken too long to * negotiate and that it should interrupt * the CPU so we can see what happened. * The value is computed as follows (from * NCR/Symbios chip docs). * * (Time Out Period) * (Input Clock) * STO = ---------------------------------- * (8192) * (Clock Conversion Factor) * * You usually want the time out period to be * around 250ms, I think we'll set it a little * bit higher to account for fully loaded SCSI * bus's and slow devices that don't respond so * quickly to selection attempts. (yeah, I know * this is out of spec. but there is a lot of * buggy pieces of firmware out there so bite me) * * c) Imperical constants for synchronous offset * and transfer period register values * * This entails the smallest and largest sync * period we could ever handle on this ESP. */ fmhz = esp->cfreq; if(fmhz <= (5000000)) ccf = 0; else ccf = (((5000000 - 1) + (fmhz))/(5000000)); if(!ccf || ccf > 8) { /* If we can't find anything reasonable, * just assume 20MHZ. This is the clock * frequency of the older sun4c's where I've * been unable to find the clock-frequency * PROM property. All other machines provide * useful values it seems. */ ccf = ESP_CCF_F4; fmhz = (20000000); } if(ccf==(ESP_CCF_F7+1)) esp->cfact = ESP_CCF_F0; else if(ccf == ESP_CCF_NEVER) esp->cfact = ESP_CCF_F2; else esp->cfact = ccf; esp->cfreq = fmhz; esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); esp->ctick = ESP_TICK(ccf, esp->ccycle); esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); esp->sync_defp = SYNC_DEFP_SLOW; printk("SCSI ID %d Clock %d MHz CCF=%d Time-Out %d ", esp->scsi_id, (esp->cfreq / 1000000), esp->ccf, (int) esp->neg_defp); /* Fill in ehost data */ esp->ehost->base = (unsigned char *) eregs; esp->ehost->this_id = esp->scsi_id; esp->ehost->irq = esp->irq; /* SCSI id mask */ esp->scsi_id_mask = (1 << esp->scsi_id); /* Probe the revision of this esp */ esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); SETREG(eregs->esp_cfg2, esp->config2); #ifndef SYMBIOS_HACK if((GETREG(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) != (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { printk("NCR53C90(esp100) detected\n"); esp->erev = esp100; } else { #endif esp->config2 = 0; SETREG(eregs->esp_cfg2, esp->config2); SETREG(eregs->esp_cfg3, 0); esp->config3[0] = 5; SETREG(eregs->esp_cfg3, esp->config3[0]); #ifndef SYMBIOS_HACK if(GETREG(eregs->esp_cfg3) != 5) { printk("NCR53C90A(esp100a) detected\n"); esp->erev = esp100a; } else { #else { #endif int target; for(target=0; target<8; target++) esp->config3[target] = 0; SETREG(eregs->esp_cfg3, 0); #ifndef SYMBIOS_HACK if(ccf > ESP_CCF_F5) { #endif printk("NCR53C9XF(espfast) detected\n"); esp->erev = fast; esp->config2 = 0; SETREG(eregs->esp_cfg2, esp->config2); esp->sync_defp = SYNC_DEFP_FAST; #ifndef SYMBIOS_HACK } else { printk("NCR53C9x(esp236) detected\n"); esp->erev = esp236; esp->config2 = 0; SETREG(eregs->esp_cfg2, esp->config2); } } #endif } /* Initialize the command queues */ esp->current_SC = 0; esp->disconnected_SC = 0; esp->issue_SC = 0; /* Clear the state machines. */ esp->targets_present = 0; esp->resetting_bus = 0; esp->snip = 0; esp->targets_present = 0; for(i = 0; i < 32; i++) esp->espcmdlog[i] = 0; esp->espcmdent = 0; for(i = 0; i < 16; i++) { esp->cur_msgout[i] = 0; esp->cur_msgin[i] = 0; } esp->prevmsgout = esp->prevmsgin = 0; esp->msgout_len = esp->msgin_len = 0; /* Reset the thing before we try anything... */ esp_bootup_reset(esp, eregs); esps_in_use++; } /* The info function will return whatever useful * information the developer sees fit. If not provided, then * the name field will be used instead. */ const char *esp_info(struct Scsi_Host *host) { struct NCR_ESP *esp; esp = (struct NCR_ESP *) host->hostdata; switch(esp->erev) { case esp100: return "ESP100 (NCR53C90)"; case esp100a: return "ESP100A (NCR53C90A)"; case esp236: return "ESP236"; case fas216: return "ESP216-FAST"; case fas236: return "ESP236-FAST"; case fashme: return "ESP366-HME"; case fas100a: return "ESP100A-FAST"; default: panic("Bogon ESP revision"); }; } /* From Wolfgang Stanglmeier's NCR scsi driver. */ struct info_str { char *buffer; int length; int offset; int pos; }; static void copy_mem_info(struct info_str *info, char *data, int len) { if (info->pos + len > info->length) len = info->length - info->pos; if (info->pos + len < info->offset) { info->pos += len; return; } if (info->pos < info->offset) { data += (info->offset - info->pos); len -= (info->offset - info->pos); } if (len > 0) { memcpy(info->buffer + info->pos, data, len); info->pos += len; } } static int copy_info(struct info_str *info, char *fmt, ...) { va_list args; char buf[81]; int len; va_start(args, fmt); len = vsprintf(buf, fmt, args); va_end(args); copy_mem_info(info, buf, len); return len; } static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len) { struct info_str info; int i; info.buffer = ptr; info.length = len; info.offset = offset; info.pos = 0; copy_info(&info, "Sparc ESP Host Adapter:\n"); copy_info(&info, "\tPROM node\t\t%08lx\n", (unsigned long) esp->prom_node); copy_info(&info, "\tPROM name\t\t%s\n", esp->prom_name); copy_info(&info, "\tESP Model\t\t"); switch(esp->erev) { case esp100: copy_info(&info, "ESP100\n"); break; case esp100a: copy_info(&info, "ESP100A\n"); break; case esp236: copy_info(&info, "ESP236\n"); break; case fas216: copy_info(&info, "FAS216\n"); break; case fas236: copy_info(&info, "FAS236\n"); break; case fas100a: copy_info(&info, "FAS100A\n"); break; case fast: copy_info(&info, "FAST\n"); break; case fashme: copy_info(&info, "Happy Meal FAS\n"); break; case espunknown: default: copy_info(&info, "Unknown!\n"); break; }; #ifdef CONFIG_SCSI_SUNESP copy_info(&info, "\tDMA Revision\t\t"); switch(((struct Linux_SBus_DMA*) (esp->dma))->revision) { case dvmarev0: copy_info(&info, "Rev 0\n"); break; case dvmaesc1: copy_info(&info, "ESC Rev 1\n"); break; case dvmarev1: copy_info(&info, "Rev 1\n"); break; case dvmarev2: copy_info(&info, "Rev 2\n"); break; case dvmarev3: copy_info(&info, "Rev 3\n"); break; case dvmarevplus: copy_info(&info, "Rev 1+\n"); break; case dvmahme: copy_info(&info, "Rev HME/FAS\n"); break; default: copy_info(&info, "Unknown!\n"); break; }; #endif copy_info(&info, "\tLive Targets\t\t[ "); for(i = 0; i < 15; i++) { if(esp->targets_present & (1 << i)) copy_info(&info, "%d ", i); } copy_info(&info, "]\n\n"); /* Now describe the state of each existing target. */ copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\tWide\n"); for(i = 0; i < 15; i++) { if(esp->targets_present & (1 << i)) { Scsi_Device *SDptr = esp->ehost->host_queue; while((SDptr->host != esp->ehost) && (SDptr->id != i) && (SDptr->next)) SDptr = SDptr->next; copy_info(&info, "%d\t\t", i); copy_info(&info, "%08lx\t", esp->config3[i]); copy_info(&info, "[%02lx,%02lx]\t\t\t", SDptr->sync_max_offset, SDptr->sync_min_period); copy_info(&info, "%s\t\t", SDptr->disconnect ? "yes" : "no"); copy_info(&info, "%s\n", (esp->config3[i] & ESP_CONFIG3_EWIDE) ? "yes" : "no"); } } return info.pos > info.offset? info.pos - info.offset : 0; } /* ESP proc filesystem code. */ int esp_proc_info(char *buffer, char **start, off_t offset, int length, int hostno, int inout) { struct NCR_ESP *esp; if(inout) return -EINVAL; /* not yet */ for_each_esp(esp) { if(esp->ehost->host_no == hostno) break; } if(!esp) return -EINVAL; if(start) *start = buffer; return esp_host_info(esp, buffer, offset, length); } /* Some rules: * * 1) Never ever panic while something is live on the bus. * If there is to be any chance of syncing the disks this * rule is to be obeyed. * * 2) Any target that causes a foul condition will no longer * have synchronous transfers done to it, no questions * asked. * * 3) Keep register accesses to a minimum. Think about some * day when we have Xbus machines this is running on and * the ESP chip is on the other end of the machine on a * different board from the cpu where this is running. */ /* Fire off a command. We assume the bus is free and that the only * case where we could see an interrupt is where we have disconnected * commands active and they are trying to reselect us. */ static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp) { switch(sp->cmd_len) { case 6: case 10: case 12: esp->esp_slowcmd = 0; break; default: esp->esp_slowcmd = 1; esp->esp_scmdleft = sp->cmd_len; esp->esp_scmdp = &sp->cmnd[0]; break; }; } static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset) { esp->cur_msgout[0] = EXTENDED_MESSAGE; esp->cur_msgout[1] = 3; esp->cur_msgout[2] = EXTENDED_SDTR; esp->cur_msgout[3] = period; esp->cur_msgout[4] = offset; esp->msgout_len = 5; } /* SIZE is in bits, currently HME only supports 16 bit wide transfers. */ static inline void build_wide_nego_msg(struct NCR_ESP *esp, int size) { esp->cur_msgout[0] = EXTENDED_MESSAGE; esp->cur_msgout[1] = 2; esp->cur_msgout[2] = EXTENDED_WDTR; switch(size) { case 32: esp->cur_msgout[3] = 2; break; case 16: esp->cur_msgout[3] = 1; break; case 8: default: esp->cur_msgout[3] = 0; break; }; esp->msgout_len = 4; } static inline void esp_exec_cmd(struct NCR_ESP *esp) { struct ESP_regs *eregs = esp->eregs; Scsi_Cmnd *SCptr; Scsi_Device *SDptr; volatile unchar *cmdp = esp->esp_command; unsigned char the_esp_command; int lun, target; int i; /* Hold off if we've been reselected or an IRQ is showing... */ if(esp->disconnected_SC || esp->dma_irq_p(esp)) return; /* Grab first member of the issue queue. */ SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); /* Safe to panic here because current_SC is null. */ if(!SCptr) panic("esp: esp_exec_cmd and issue queue is NULL"); SDptr = SCptr->device; lun = SCptr->lun; target = SCptr->target; esp->snip = 0; esp->msgout_len = 0; /* Send it out whole, or piece by piece? The ESP * only knows how to automatically send out 6, 10, * and 12 byte commands. I used to think that the * Linux SCSI code would never throw anything other * than that to us, but then again there is the * SCSI generic driver which can send us anything. */ esp_check_cmd(esp, SCptr); /* If arbitration/selection is successful, the ESP will leave * ATN asserted, causing the target to go into message out * phase. The ESP will feed the target the identify and then * the target can only legally go to one of command, * datain/out, status, or message in phase, or stay in message * out phase (should we be trying to send a sync negotiation * message after the identify). It is not allowed to drop * BSY, but some buggy targets do and we check for this * condition in the selection complete code. Most of the time * we'll make the command bytes available to the ESP and it * will not interrupt us until it finishes command phase, we * cannot do this for command sizes the ESP does not * understand and in this case we'll get interrupted right * when the target goes into command phase. * * It is absolutely _illegal_ in the presence of SCSI-2 devices * to use the ESP select w/o ATN command. When SCSI-2 devices are * present on the bus we _must_ always go straight to message out * phase with an identify message for the target. Being that * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 * selections should not confuse SCSI-1 we hope. */ if(SDptr->sync) { /* this targets sync is known */ #ifdef CONFIG_SCSI_SUNESP do_sync_known: #endif if(SDptr->disconnect) *cmdp++ = IDENTIFY(1, lun); else *cmdp++ = IDENTIFY(0, lun); if(esp->esp_slowcmd) { the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); esp_advance_phase(SCptr, in_slct_stop); } else { the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); esp_advance_phase(SCptr, in_slct_norm); } } else if(!(esp->targets_present & (1<disconnect)) { /* After the bootup SCSI code sends both the * TEST_UNIT_READY and INQUIRY commands we want * to at least attempt allowing the device to * disconnect. */ ESPMISC(("esp: Selecting device for first time. target=%d " "lun=%d\n", target, SCptr->lun)); if(!SDptr->borken && !SDptr->disconnect) SDptr->disconnect = 1; *cmdp++ = IDENTIFY(0, lun); esp->prevmsgout = NOP; esp_advance_phase(SCptr, in_slct_norm); the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); /* Take no chances... */ SDptr->sync_max_offset = 0; SDptr->sync_min_period = 0; } else { int toshiba_cdrom_hwbug_wkaround = 0; #ifdef CONFIG_SCSI_SUNESP /* Never allow disconnects or synchronous transfers on * SparcStation1 and SparcStation1+. Allowing those * to be enabled seems to lockup the machine completely. */ if((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) || (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) { /* But we are nice and allow tapes to disconnect. */ if(SDptr->type == TYPE_TAPE) SDptr->disconnect = 1; else SDptr->disconnect = 0; SDptr->sync_max_offset = 0; SDptr->sync_min_period = 0; SDptr->sync = 1; esp->snip = 0; goto do_sync_known; } #endif /* We've talked to this guy before, * but never negotiated. Let's try, * need to attempt WIDE first, before * sync nego, as per SCSI 2 standard. */ if(esp->erev == fashme && !SDptr->wide) { if(!SDptr->borken && (SDptr->type != TYPE_ROM || strncmp(SDptr->vendor, "TOSHIBA", 7))) { build_wide_nego_msg(esp, 16); esp->config3[SCptr->target] |= ESP_CONFIG3_EWIDE; SDptr->wide = 1; esp->wnip = 1; goto after_nego_msg_built; } else { SDptr->wide = 1; /* Fall through and try sync. */ } } if(!SDptr->borken) { if((SDptr->type == TYPE_ROM) && (!strncmp(SDptr->vendor, "TOSHIBA", 7))) { /* Nice try sucker... */ printk(KERN_INFO "esp%d: Disabling sync for buggy " "Toshiba CDROM.\n", esp->esp_id); toshiba_cdrom_hwbug_wkaround = 1; build_sync_nego_msg(esp, 0, 0); } else { build_sync_nego_msg(esp, esp->sync_defp, 15); } } else { build_sync_nego_msg(esp, 0, 0); } SDptr->sync = 1; esp->snip = 1; after_nego_msg_built: /* A fix for broken SCSI1 targets, when they disconnect * they lock up the bus and confuse ESP. So disallow * disconnects for SCSI1 targets for now until we * find a better fix. * * Addendum: This is funny, I figured out what was going * on. The blotzed SCSI1 target would disconnect, * one of the other SCSI2 targets or both would be * disconnected as well. The SCSI1 target would * stay disconnected long enough that we start * up a command on one of the SCSI2 targets. As * the ESP is arbitrating for the bus the SCSI1 * target begins to arbitrate as well to reselect * the ESP. The SCSI1 target refuses to drop it's * ID bit on the data bus even though the ESP is * at ID 7 and is the obvious winner for any * arbitration. The ESP is a poor sport and refuses * to lose arbitration, it will continue indefinately * trying to arbitrate for the bus and can only be * stopped via a chip reset or SCSI bus reset. * Therefore _no_ disconnects for SCSI1 targets * thank you very much. ;-) */ if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) || #if 1 /* Until I find out why HME barfs with disconnects enabled... */ toshiba_cdrom_hwbug_wkaround || SDptr->borken || esp->erev == fashme) { #else toshiba_cdrom_hwbug_wkaround || SDptr->borken) { #endif printk(KERN_INFO "esp%d: Disabling DISCONNECT for target %d " "lun %d\n", esp->esp_id, SCptr->target, SCptr->lun); SDptr->disconnect = 0; *cmdp++ = IDENTIFY(0, lun); } else { *cmdp++ = IDENTIFY(1, lun); } /* ESP fifo is only so big... * Make this look like a slow command. */ esp->esp_slowcmd = 1; esp->esp_scmdleft = SCptr->cmd_len; esp->esp_scmdp = &SCptr->cmnd[0]; the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); esp_advance_phase(SCptr, in_slct_msg); } if(!esp->esp_slowcmd) for(i = 0; i < SCptr->cmd_len; i++) *cmdp++ = SCptr->cmnd[i]; /* HME sucks... */ if(esp->erev == fashme) SETREG(eregs->esp_busid, (target & 0xf) | (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT)); else SETREG(eregs->esp_busid, (target & 7)); SETREG(eregs->esp_soff, SDptr->sync_max_offset); SETREG(eregs->esp_stp, SDptr->sync_min_period); if(esp->erev > esp100a) SETREG(eregs->esp_cfg3, esp->config3[target]); i = (cmdp - esp->esp_command); /* Set up the DMA and ESP counters */ if(esp->do_pio_cmds){ int j = 0; for(;jesp_fdata, esp->esp_command[j]); the_esp_command &= ~ESP_CMD_DMA; /* Tell ESP to "go". */ esp_cmd(esp, eregs, the_esp_command); } else { if(esp->erev == fashme) { esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* Grrr! */ /* Set up the HME counters */ SETREG(eregs->esp_tclow, i); SETREG(eregs->esp_tcmed, 0); SETREG(eregs->fas_rlo, 0); SETREG(eregs->fas_rhi, 0); esp_cmd(esp, eregs, the_esp_command); esp->dma_init_write(esp, esp->esp_command_dvma, 16); } else { /* Set up the ESP counters */ SETREG(eregs->esp_tclow, i); SETREG(eregs->esp_tcmed, 0); esp->dma_init_write(esp, esp->esp_command_dvma, i); /* Tell ESP to "go". */ esp_cmd(esp, eregs, the_esp_command); } } } /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) { struct NCR_ESP *esp; unsigned long flags; /* Set up func ptr and initial driver cmd-phase. */ SCpnt->scsi_done = done; SCpnt->SCp.phase = not_issued; esp = (struct NCR_ESP *) SCpnt->host->hostdata; if(esp->dma_led_on) esp->dma_led_on(esp); /* We use the scratch area. */ ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->target, SCpnt->lun)); ESPDISC(("N<%02x,%02x>", SCpnt->target, SCpnt->lun)); if(!SCpnt->use_sg) { ESPQUEUE(("!use_sg\n")); SCpnt->SCp.this_residual = SCpnt->request_bufflen; SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->request_buffer; SCpnt->SCp.buffers_residual = 0; if (esp->dma_mmu_get_scsi_one) esp->dma_mmu_get_scsi_one (esp, SCpnt); else SCpnt->SCp.have_data_in = (int) SCpnt->SCp.ptr = (char *) virt_to_phys(SCpnt->request_buffer); } else { ESPQUEUE(("use_sg ")); #ifdef DEBUG_ESP_SG printk("esp%d: sglist at %p with %d buffers\n", esp->esp_id, SCpnt->buffer, SCpnt->use_sg); #endif SCpnt->SCp.buffer = (struct scatterlist *) SCpnt->buffer; SCpnt->SCp.buffers_residual = SCpnt->use_sg - 1; SCpnt->SCp.this_residual = SCpnt->SCp.buffer->length; if (esp->dma_mmu_get_scsi_sgl) esp->dma_mmu_get_scsi_sgl (esp, SCpnt); else SCpnt->SCp.ptr = (char *) virt_to_phys(SCpnt->SCp.buffer->address); } SCpnt->SCp.Status = CHECK_CONDITION; SCpnt->SCp.Message = 0xff; SCpnt->SCp.sent_command = 0; /* Place into our queue. */ if(SCpnt->cmnd[0] == REQUEST_SENSE) { ESPQUEUE(("RQSENSE\n")); prepend_SC(&esp->issue_SC, SCpnt); } else { ESPQUEUE(("\n")); append_SC(&esp->issue_SC, SCpnt); } save_and_cli(flags); /* Run it now if we can. */ if(!esp->current_SC && !esp->resetting_bus) esp_exec_cmd(esp); restore_flags(flags); return 0; } /* Only queuing supported in this ESP driver. */ int esp_command(Scsi_Cmnd *SCpnt) { #ifdef DEBUG_ESP struct NCR_ESP *esp = (struct NCR_ESP *) SCpnt->host->hostdata; #endif ESPLOG(("esp%d: esp_command() called...\n", esp->esp_id)); return -1; } /* Dump driver state. */ static inline void esp_dump_cmd(Scsi_Cmnd *SCptr) { ESPLOG(("[tgt<%02x> lun<%02x> " "pphase<%s> cphase<%s>]", SCptr->target, SCptr->lun, phase_string(SCptr->SCp.sent_command), phase_string(SCptr->SCp.phase))); } static inline void esp_dump_state(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; #ifdef DEBUG_ESP_CMDS int i; #endif ESPLOG(("esp%d: dumping state\n", esp->esp_id)); /* Print DMA status */ esp->dma_dump_state(esp); ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", esp->esp_id, GETREG(eregs->esp_status), GETREG(eregs->esp_sstep), GETREG(eregs->esp_intrpt))); #ifdef DEBUG_ESP_CMDS printk("esp%d: last ESP cmds [", esp->esp_id); i = (esp->espcmdent - 1) & 31; printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); i = (i - 1) & 31; printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); i = (i - 1) & 31; printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); i = (i - 1) & 31; printk("<"); esp_print_cmd(esp->espcmdlog[i]); printk(">"); printk("]\n"); #endif /* (DEBUG_ESP_CMDS) */ if(SCptr) { ESPLOG(("esp%d: current command ", esp->esp_id)); esp_dump_cmd(SCptr); } ESPLOG(("\n")); SCptr = esp->disconnected_SC; ESPLOG(("esp%d: disconnected ", esp->esp_id)); while(SCptr) { esp_dump_cmd(SCptr); SCptr = (Scsi_Cmnd *) SCptr->host_scribble; } ESPLOG(("\n")); } /* Abort a command. */ int esp_abort(Scsi_Cmnd *SCptr) { struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->host->hostdata; struct ESP_regs *eregs = esp->eregs; int don; unsigned long flags; ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); esp_dump_state(esp, eregs); /* Wheee, if this is the current command on the bus, the * best we can do is assert ATN and wait for msgout phase. * This should even fix a hung SCSI bus when we lose state * in the driver and timeout because the eventual phase change * will cause the ESP to (eventually) give an interrupt. */ save_and_cli(flags); if(esp->current_SC == SCptr) { esp->cur_msgout[0] = ABORT; esp->msgout_len = 1; esp->msgout_ctr = 0; esp_cmd(esp, eregs, ESP_CMD_SATN); restore_flags(flags); return SCSI_ABORT_PENDING; } restore_flags(flags); /* If it is still in the issue queue then we can safely * call the completion routine and report abort success. */ don = esp->dma_ports_p(esp); if(don) { esp->dma_ints_off(esp); synchronize_irq(); } if(esp->issue_SC) { Scsi_Cmnd **prev, *this; for(prev = (&esp->issue_SC), this = esp->issue_SC; this; prev = (Scsi_Cmnd **) &(this->host_scribble), this = (Scsi_Cmnd *) this->host_scribble) { if(this == SCptr) { *prev = (Scsi_Cmnd *) this->host_scribble; this->host_scribble = NULL; this->result = DID_ABORT << 16; this->done(this); if(don) esp->dma_ints_on(esp); return SCSI_ABORT_SUCCESS; } } } /* Yuck, the command to abort is disconnected, it is not * worth trying to abort it now if something else is live * on the bus at this time. So, we let the SCSI code wait * a little bit and try again later. */ if(esp->current_SC) return SCSI_ABORT_BUSY; /* It's disconnected, we have to reconnect to re-establish * the nexus and tell the device to abort. However, we really * cannot 'reconnect' per se, therefore we tell the upper layer * the safest thing we can. This is, wait a bit, if nothing * happens, we are really hung so reset the bus. */ return SCSI_ABORT_SNOOZE; } /* Reset ESP chip, reset hanging bus, then kill active and * disconnected commands for targets without soft reset. */ int esp_reset(Scsi_Cmnd *SCptr, unsigned int how) { struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->host->hostdata; struct ESP_regs *eregs = esp->eregs; ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); esp->resetting_bus = 1; esp_cmd(esp, eregs, ESP_CMD_RS); return SCSI_RESET_PENDING; } /* Internal ESP done function. */ static void esp_done(struct NCR_ESP *esp, int error) { Scsi_Cmnd *done_SC; if(esp->current_SC) { unsigned long flags; done_SC = esp->current_SC; esp->current_SC = NULL; /* Free dvma entry. */ if(!done_SC->use_sg) { if (esp->dma_mmu_release_scsi_one) esp->dma_mmu_release_scsi_one (esp, done_SC); } else { #ifdef DEBUG_ESP_SG printk("esp%d: unmapping sg ", esp->esp_id); #endif if (esp->dma_mmu_release_scsi_sgl) esp->dma_mmu_release_scsi_sgl (esp, done_SC); #ifdef DEBUG_ESP_SG printk("done.\n"); #endif } done_SC->result = error; done_SC->scsi_done(done_SC); save_and_cli(flags); /* Bus is free, issue any commands in the queue. */ if(esp->issue_SC && !esp->current_SC) esp_exec_cmd(esp); restore_flags(flags); } else { /* Panic is safe as current_SC is null so we may still * be able to accept more commands to sync disk buffers. */ ESPLOG(("panicing\n")); panic("esp: done() called with NULL esp->current_SC"); } } /* Wheee, ESP interrupt engine. */ enum { do_phase_determine, do_reset_bus, do_reset_complete, do_work_bus, do_intr_end, }; /* Forward declarations. */ static int esp_do_phase_determine(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs); static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs); static inline int sreg_datainp(unchar sreg) { return (sreg & ESP_STAT_PMASK) == ESP_DIP; } static inline int sreg_dataoutp(unchar sreg) { return (sreg & ESP_STAT_PMASK) == ESP_DOP; } /* Did they drop these fabs on the floor or what?!?!! */ static inline void hme_fifo_hwbug_workaround(struct NCR_ESP *esp, struct ESP_regs *eregs) { unchar status = esp->sreg; /* Cannot safely frob the fifo for these following cases. */ if(sreg_datainp(status) || sreg_dataoutp(status) || (esp->current_SC && esp->current_SC->SCp.phase == in_data_done)) { ESPHME(("")); return; } else { unsigned long count = 0; unsigned long fcnt = GETREG(eregs->esp_fflags) & ESP_FF_FBYTES; /* The HME stores bytes in multiples of 2 in the fifo. */ ESPHME(("hme_fifo[fcnt=%d", (int)fcnt)); while(fcnt) { esp->hme_fifo_workaround_buffer[count++] = GETREG(eregs->esp_fdata); esp->hme_fifo_workaround_buffer[count++] = GETREG(eregs->esp_fdata); ESPHME(("<%02x,%02x>", esp->hme_fifo_workaround_buffer[count-2], esp->hme_fifo_workaround_buffer[count-1])); fcnt--; } if(GETREG(eregs->esp_status2) & ESP_STAT2_F1BYTE) { ESPHME(("")); SETREG(eregs->esp_fdata, 0); esp->hme_fifo_workaround_buffer[count++] = GETREG(eregs->esp_fdata); ESPHME(("<%02x,0x00>", esp->hme_fifo_workaround_buffer[count-1])); ESPHME(("CMD_FLUSH")); esp_cmd(esp, eregs, ESP_CMD_FLUSH); } else { ESPHME(("no_xtra_byte")); } esp->hme_fifo_workaround_count = count; ESPHME(("wkarnd_cnt=%d]", (int)count)); } } static inline void hme_fifo_push(struct NCR_ESP *esp, struct ESP_regs *eregs, unchar *bytes, unchar count) { esp_cmd(esp, eregs, ESP_CMD_FLUSH); while(count) { SETREG(eregs->esp_fdata, *bytes++); SETREG(eregs->esp_fdata, 0); count--; } } /* We try to avoid some interrupts by jumping ahead and see if the ESP * has gotten far enough yet. Hence the following. */ static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs, Scsi_Cmnd *scp, int prev_phase, int new_phase) { if(scp->SCp.sent_command != prev_phase) return 0; if(esp->dma_irq_p(esp)) { /* Yes, we are able to save an interrupt. */ esp->sreg = GETREG(eregs->esp_status); if(esp->erev == fashme) { /* This chip is really losing. */ ESPHME(("HME[")); /* Must latch fifo before reading the interrupt * register else garbage ends up in the FIFO * which confuses the driver utterly. * Happy Meal indeed.... */ ESPHME(("fifo_workaround]")); hme_fifo_hwbug_workaround(esp, eregs); } esp->ireg = GETREG(eregs->esp_intrpt); esp->sreg &= ~(ESP_STAT_INTR); if(!(esp->ireg & ESP_INTR_SR)) return 0; else return do_reset_complete; } /* Ho hum, target is taking forever... */ scp->SCp.sent_command = new_phase; /* so we don't recurse... */ return do_intr_end; } static inline int skipahead2(struct NCR_ESP *esp, struct ESP_regs *eregs, Scsi_Cmnd *scp, int prev_phase1, int prev_phase2, int new_phase) { if(scp->SCp.sent_command != prev_phase1 && scp->SCp.sent_command != prev_phase2) return 0; if(esp->dma_irq_p(esp)) { /* Yes, we are able to save an interrupt. */ esp->sreg = GETREG(eregs->esp_status); if(esp->erev == fashme) { /* This chip is really losing. */ ESPHME(("HME[")); /* Must latch fifo before reading the interrupt * register else garbage ends up in the FIFO * which confuses the driver utterly. * Happy Meal indeed.... */ ESPHME(("fifo_workaround]")); hme_fifo_hwbug_workaround(esp, eregs); } esp->ireg = GETREG(eregs->esp_intrpt); esp->sreg &= ~(ESP_STAT_INTR); if(!(esp->ireg & ESP_INTR_SR)) return 0; else return do_reset_complete; } /* Ho hum, target is taking forever... */ scp->SCp.sent_command = new_phase; /* so we don't recurse... */ return do_intr_end; } /* Misc. esp helper routines. */ static inline void esp_setcount(struct ESP_regs *eregs, int cnt, int hme) { SETREG(eregs->esp_tclow, (cnt & 0xff)); SETREG(eregs->esp_tcmed, ((cnt >> 8) & 0xff)); if(hme) { SETREG(eregs->fas_rlo, 0); SETREG(eregs->fas_rhi, 0); } } static inline int esp_getcount(struct ESP_regs *eregs) { return (((GETREG(eregs->esp_tclow))&0xff) | (((GETREG(eregs->esp_tcmed))&0xff) << 8)); } static inline int fcount(struct NCR_ESP *esp, struct ESP_regs *eregs) { if(esp->erev == fashme) return esp->hme_fifo_workaround_count; else return GETREG(eregs->esp_fflags) & ESP_FF_FBYTES; } static inline int fnzero(struct NCR_ESP *esp, struct ESP_regs *eregs) { if(esp->erev == fashme) return 0; else return GETREG(eregs->esp_fflags) & ESP_FF_ONOTZERO; } /* XXX speculative nops unnecessary when continuing amidst a data phase * XXX even on esp100!!! another case of flooding the bus with I/O reg * XXX writes... */ static inline void esp_maybe_nop(struct NCR_ESP *esp, struct ESP_regs *eregs) { if(esp->erev == esp100) esp_cmd(esp, eregs, ESP_CMD_NULL); } static inline int sreg_to_dataphase(unchar sreg) { if((sreg & ESP_STAT_PMASK) == ESP_DOP) return in_dataout; else return in_datain; } /* The ESP100 when in synchronous data phase, can mistake a long final * REQ pulse from the target as an extra byte, it places whatever is on * the data lines into the fifo. For now, we will assume when this * happens that the target is a bit quirky and we don't want to * be talking synchronously to it anyways. Regardless, we need to * tell the ESP to eat the extraneous byte so that we can proceed * to the next phase. */ static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs, Scsi_Cmnd *sp, int fifocnt) { /* Do not touch this piece of code. */ if((!(esp->erev == esp100)) || (!(sreg_datainp((esp->sreg = GETREG(eregs->esp_status))) && !fifocnt) && !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) { if(sp->SCp.phase == in_dataout) esp_cmd(esp, eregs, ESP_CMD_FLUSH); return 0; } else { /* Async mode for this guy. */ build_sync_nego_msg(esp, 0, 0); /* Ack the bogus byte, but set ATN first. */ esp_cmd(esp, eregs, ESP_CMD_SATN); esp_cmd(esp, eregs, ESP_CMD_MOK); return 1; } } /* This closes the window during a selection with a reselect pending, because * we use DMA for the selection process the FIFO should hold the correct * contents if we get reselected during this process. So we just need to * ack the possible illegal cmd interrupt pending on the esp100. */ static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs) { volatile unchar junk; if(esp->erev != esp100) return 0; junk = GETREG(eregs->esp_intrpt); if(junk & ESP_INTR_SR) return 1; return 0; } /* This verifies the BUSID bits during a reselection so that we know which * target is talking to us. */ static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs) { int it, me = esp->scsi_id_mask, targ = 0; if(2 != fcount(esp, eregs)) return -1; if(esp->erev == fashme) { /* HME does not latch it's own BUS ID bits during * a reselection. Also the target number is given * as an unsigned char, not as a sole bit number * like the other ESP's do. * Happy Meal indeed.... */ targ = esp->hme_fifo_workaround_buffer[0]; } else { it = GETREG(eregs->esp_fdata); if(!(it & me)) return -1; it &= ~me; if(it & (it - 1)) return -1; while(!(it & 1)) targ++, it >>= 1; } return targ; } /* This verifies the identify from the target so that we know which lun is * being reconnected. */ static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs) { int lun; if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) return -1; if(esp->erev == fashme) lun = esp->hme_fifo_workaround_buffer[1]; else lun = GETREG(eregs->esp_fdata); if(esp->sreg & ESP_STAT_PERR) return 0; if((lun & 0x40) || !(lun & 0x80)) return -1; return lun & 7; } /* This puts the driver in a state where it can revitalize a command that * is being continued due to reselection. */ static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs, Scsi_Cmnd *sp) { Scsi_Device *dp = sp->device; SETREG(eregs->esp_soff, dp->sync_max_offset); SETREG(eregs->esp_stp, dp->sync_min_period); if(esp->erev > esp100a) SETREG(eregs->esp_cfg3, esp->config3[sp->target]); if(esp->erev == fashme) SETREG(eregs->esp_busid, (sp->target & 0xf) | (ESP_BUSID_RESELID | ESP_BUSID_CTR32BIT)); esp->current_SC = sp; } /* This will place the current working command back into the issue queue * if we are to receive a reselection amidst a selection attempt. */ static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp) { if(!esp->disconnected_SC) printk("esp%d: Weird, being reselected but disconnected " "command queue is empty.\n", esp->esp_id); esp->snip = 0; esp->current_SC = 0; sp->SCp.phase = not_issued; append_SC(&esp->issue_SC, sp); } /* Begin message in phase. */ static inline int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs) { /* Must be very careful with the fifo on the HME */ if((esp->erev != fashme) || !(GETREG(eregs->esp_status2) & ESP_STAT2_FEMPTY)) esp_cmd(esp, eregs, ESP_CMD_FLUSH); esp_maybe_nop(esp, eregs); esp_cmd(esp, eregs, ESP_CMD_TI); esp->msgin_len = 1; esp->msgin_ctr = 0; esp_advance_phase(esp->current_SC, in_msgindone); return do_work_bus; } static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp) { ++sp->SCp.buffer; --sp->SCp.buffers_residual; sp->SCp.this_residual = sp->SCp.buffer->length; if (esp->dma_advance_sg) esp->dma_advance_sg (sp); else sp->SCp.ptr = (char *)virt_to_phys(sp->SCp.buffer->address); } /* Please note that the way I've coded these routines is that I _always_ * check for a disconnect during any and all information transfer * phases. The SCSI standard states that the target _can_ cause a BUS * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note * that during information transfer phases the target controls every * change in phase, the only thing the initiator can do is "ask" for * a message out phase by driving ATN true. The target can, and sometimes * will, completely ignore this request so we cannot assume anything when * we try to force a message out phase to abort/reset a target. Most of * the time the target will eventually be nice and go to message out, so * we may have to hold on to our state about what we want to tell the target * for some period of time. */ /* I think I have things working here correctly. Even partial transfers * within a buffer or sub-buffer should not upset us at all no matter * how bad the target and/or ESP fucks things up. */ static inline int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; int thisphase, hmuch; ESPDATA(("esp_do_data: ")); esp_maybe_nop(esp, eregs); thisphase = sreg_to_dataphase(esp->sreg); esp_advance_phase(SCptr, thisphase); ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); hmuch = esp->dma_can_transfer(esp, SCptr); ESPDATA(("hmuch<%d> ", hmuch)); esp->current_transfer_size = hmuch; if(esp->erev == fashme) { /* Touchy chip, this stupid HME scsi adapter... */ esp_setcount(eregs, hmuch, 1); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); if(thisphase == in_datain) esp->dma_init_read(esp, (__u32)((unsigned long)SCptr->SCp.ptr), hmuch); else esp->dma_init_write(esp, (__u32)((unsigned long)SCptr->SCp.ptr), hmuch); } else { esp_setcount(eregs, hmuch, 0); esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr), hmuch, (thisphase == in_datain)); ESPDATA(("DMA|TI --> do_intr_end\n")); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); } return do_intr_end; } /* See how successful the data transfer was. */ static inline int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; if(esp->dma_led_off) esp->dma_led_off(esp); ESPDATA(("esp_do_data_finale: ")); if(SCptr->SCp.phase == in_datain) { if(esp->sreg & ESP_STAT_PERR) { /* Yuck, parity error. The ESP asserts ATN * so that we can go to message out phase * immediately and inform the target that * something bad happened. */ ESPLOG(("esp%d: data bad parity detected.\n", esp->esp_id)); esp->cur_msgout[0] = INITIATOR_ERROR; esp->msgout_len = 1; } if(esp->dma_drain) esp->dma_drain(esp); } if(esp->dma_invalidate) esp->dma_invalidate(esp); /* This could happen for the above parity error case. */ if(!(esp->ireg == ESP_INTR_BSERV)) { /* Please go to msgout phase, please please please... */ ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", esp->esp_id)); return esp_do_phase_determine(esp, eregs); } /* Check for partial transfers and other horrible events. * Note, here we read the real fifo flags register even * on HME broken adapters because we skip the HME fifo * workaround code in esp_handle() if we are doing data * phase things. We don't want to fuck directly with * the fifo like that, especially if doing syncronous * transfers! Also, will need to double the count on * HME if we are doing wide transfers, as the HME fifo * will move and count 16-bit quantities during wide data. * SMCC _and_ Qlogic can both bite me. */ fifocnt = GETREG(eregs->esp_fflags) & ESP_FF_FBYTES; if(esp->erev != fashme) ecount = esp_getcount(eregs); bytes_sent = esp->current_transfer_size; /* Uhhh, might not want both of these conditionals to run * at once on HME due to the fifo problems it has. Consider * changing it to: * * if(!(esp->sreg & ESP_STAT_TCNT)) { * bytes_sent -= ecount; * } else if(SCptr->SCp.phase == in_dataout) { * bytes_sent -= fifocnt; * } * * But only for the HME case, leave the current code alone * for all other ESP revisions as we know the existing code * works just fine for them. */ ESPDATA(("trans_sz=%d, ", bytes_sent)); if(esp->erev == fashme) { if(!(esp->sreg & ESP_STAT_TCNT)) { bytes_sent -= esp_getcount(eregs); } else if(SCptr->SCp.phase == in_dataout) { bytes_sent -= fifocnt; } } else { if(!(esp->sreg & ESP_STAT_TCNT)) bytes_sent -= ecount; if(SCptr->SCp.phase == in_dataout) bytes_sent -= fifocnt; } ESPDATA(("bytes_sent=%d, ", bytes_sent)); /* If we were in synchronous mode, check for peculiarities. */ if(esp->erev == fashme) { if(SCptr->device->sync_max_offset) { if(SCptr->SCp.phase == in_dataout) esp_cmd(esp, eregs, ESP_CMD_FLUSH); } else { esp_cmd(esp, eregs, ESP_CMD_FLUSH); } } else { if(SCptr->device->sync_max_offset) bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt); else esp_cmd(esp, eregs, ESP_CMD_FLUSH); } /* Until we are sure of what has happened, we are certainly * in the dark. */ esp_advance_phase(SCptr, in_the_dark); if(bytes_sent < 0) { /* I've seen this happen due to lost state in this * driver. No idea why it happened, but allowing * this value to be negative caused things to * lock up. This allows greater chance of recovery. */ ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", esp->esp_id, esp->current_transfer_size, fifocnt, ecount)); ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", esp->esp_id, SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); bytes_sent = 0; } /* Update the state of our transfer. */ SCptr->SCp.ptr += bytes_sent; SCptr->SCp.this_residual -= bytes_sent; if(SCptr->SCp.this_residual < 0) { /* shit */ printk("esp%d: Data transfer overrun.\n", esp->esp_id); SCptr->SCp.this_residual = 0; } /* Maybe continue. */ if(!bogus_data) { ESPDATA(("!bogus_data, ")); /* NO MATTER WHAT, we advance the scatterlist, * if the target should decide to disconnect * in between scatter chunks (which is common) * we could die horribly! I used to have the sg * advance occur only if we are going back into * (or are staying in) a data phase, you can * imagine the hell I went through trying to * figure this out. */ if(SCptr->use_sg && !SCptr->SCp.this_residual) advance_sg(esp, SCptr); if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { ESPDATA(("to more data\n")); return esp_do_data(esp, eregs); } ESPDATA(("to new phase\n")); return esp_do_phase_determine(esp, eregs); } /* Bogus data, just wait for next interrupt. */ ESPLOG(("esp%d: bogus_data during end of data phase\n", esp->esp_id)); return do_intr_end; } /* Either a command is completing or a target is dropping off the bus * to continue the command in the background so we can do other work. */ static inline int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; int rval; rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing); if(rval) return rval; if(esp->ireg != ESP_INTR_DC) { ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); return do_reset_bus; /* target will not drop BSY... */ } esp->msgout_len = 0; esp->prevmsgout = NOP; if(esp->prevmsgin == COMMAND_COMPLETE) { /* Normal end of nexus. */ if(esp->disconnected_SC || (esp->erev == fashme)) esp_cmd(esp, eregs, ESP_CMD_ESEL); if(SCptr->SCp.Status != GOOD && SCptr->SCp.Status != CONDITION_GOOD && ((1<target) & esp->targets_present) && SCptr->device->sync && SCptr->device->sync_max_offset) { /* SCSI standard says that the synchronous capabilities * should be renegotiated at this point. Most likely * we are about to request sense from this target * in which case we want to avoid using sync * transfers until we are sure of the current target * state. */ ESPMISC(("esp: Status <%d> for target %d lun %d\n", SCptr->SCp.Status, SCptr->target, SCptr->lun)); /* But don't do this when spinning up a disk at * boot time while we poll for completion as it * fills up the console with messages. Also, tapes * can report not ready many times right after * loading up a tape. */ if(SCptr->cmnd[0] != START_STOP && SCptr->data_cmnd[0] != START_STOP && SCptr->cmnd[0] != TEST_UNIT_READY && SCptr->data_cmnd[0] != TEST_UNIT_READY && !(SCptr->device->type == TYPE_TAPE && (SCptr->cmnd[0] == TEST_UNIT_READY || SCptr->data_cmnd[0] == TEST_UNIT_READY || SCptr->cmnd[0] == MODE_SENSE || SCptr->data_cmnd[0] == MODE_SENSE))) SCptr->device->sync = 0; } ESPDISC(("F<%02x,%02x>", SCptr->target, SCptr->lun)); esp_done(esp, ((SCptr->SCp.Status & 0xff) | ((SCptr->SCp.Message & 0xff)<<8) | (DID_OK << 16))); } else if(esp->prevmsgin == DISCONNECT) { /* Normal disconnect. */ esp_cmd(esp, eregs, ESP_CMD_ESEL); ESPDISC(("D<%02x,%02x>", SCptr->target, SCptr->lun)); append_SC(&esp->disconnected_SC, SCptr); esp->current_SC = NULL; if(esp->issue_SC) esp_exec_cmd(esp); } else { /* Driver bug, we do not expect a disconnect here * and should not have advanced the state engine * to in_freeing. */ ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", esp->esp_id)); return do_reset_bus; } return do_intr_end; } /* Do the needy when a target tries to reconnect to us. */ static inline int esp_do_reconnect(struct NCR_ESP *esp, struct ESP_regs *eregs) { int lun, target; Scsi_Cmnd *SCptr; /* Check for all bogus conditions first. */ target = reconnect_target(esp, eregs); if(target < 0) { ESPDISC(("bad bus bits\n")); return do_reset_bus; } lun = reconnect_lun(esp, eregs); if(lun < 0) { ESPDISC(("target=%2x, bad identify msg\n", target)); return do_reset_bus; } /* Things look ok... */ ESPDISC(("R<%02x,%02x>", target, lun)); /* Must flush both FIFO and the DVMA on HME. */ if(esp->erev == fashme) { /* XXX this still doesn't fix the problem... */ esp_cmd(esp, eregs, ESP_CMD_FLUSH); if(esp->dma_invalidate) esp->dma_invalidate(esp); } else { esp_cmd(esp, eregs, ESP_CMD_FLUSH); if(esp100_reconnect_hwbug(esp, eregs)) return do_reset_bus; esp_cmd(esp, eregs, ESP_CMD_NULL); } SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun); if(!SCptr) { Scsi_Cmnd *sp; ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", esp->esp_id)); ESPLOG(("QUEUE DUMP\n")); sp = esp->issue_SC; ESPLOG(("esp%d: issue_SC[", esp->esp_id)); while(sp) { ESPLOG(("<%02x,%02x>", sp->target, sp->lun)); sp = (Scsi_Cmnd *) sp->host_scribble; } ESPLOG(("]\n")); sp = esp->current_SC; ESPLOG(("esp%d: current_SC[", esp->esp_id)); while(sp) { ESPLOG(("<%02x,%02x>", sp->target, sp->lun)); sp = (Scsi_Cmnd *) sp->host_scribble; } ESPLOG(("]\n")); sp = esp->disconnected_SC; ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); while(sp) { ESPLOG(("<%02x,%02x>", sp->target, sp->lun)); sp = (Scsi_Cmnd *) sp->host_scribble; } ESPLOG(("]\n")); return do_reset_bus; } esp_connect(esp, eregs, SCptr); esp_cmd(esp, eregs, ESP_CMD_MOK); /* No need for explicit restore pointers operation. */ esp->snip = 0; esp_advance_phase(SCptr, in_the_dark); return do_intr_end; } /* End of NEXUS (hopefully), pick up status + message byte then leave if * all goes well. */ static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; int intr, rval; rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status); if(rval) return rval; intr = esp->ireg; ESPSTAT(("esp_do_status: ")); if(intr != ESP_INTR_DC) { int message_out = 0; /* for parity problems */ /* Ack the message. */ ESPSTAT(("ack msg, ")); esp_cmd(esp, eregs, ESP_CMD_MOK); if(esp->dma_poll) esp->dma_poll(esp, (unsigned char *) esp->esp_command); ESPSTAT(("got something, ")); /* ESP chimes in with one of * * 1) function done interrupt: * both status and message in bytes * are available * * 2) bus service interrupt: * only status byte was acquired * * 3) Anything else: * can't happen, but we test for it * anyways * * ALSO: If bad parity was detected on either * the status _or_ the message byte then * the ESP has asserted ATN on the bus * and we must therefore wait for the * next phase change. */ if(intr & ESP_INTR_FDONE) { /* We got it all, hallejulia. */ ESPSTAT(("got both, ")); SCptr->SCp.Status = esp->esp_command[0]; SCptr->SCp.Message = esp->esp_command[1]; esp->prevmsgin = SCptr->SCp.Message; esp->cur_msgin[0] = SCptr->SCp.Message; if(esp->sreg & ESP_STAT_PERR) { /* There was bad parity for the * message byte, the status byte * was ok. */ message_out = MSG_PARITY_ERROR; } } else if(intr == ESP_INTR_BSERV) { /* Only got status byte. */ ESPLOG(("esp%d: got status only, ", esp->esp_id)); if(!(esp->sreg & ESP_STAT_PERR)) { SCptr->SCp.Status = esp->esp_command[0]; SCptr->SCp.Message = 0xff; } else { /* The status byte had bad parity. * we leave the scsi_pointer Status * field alone as we set it to a default * of CHECK_CONDITION in esp_queue. */ message_out = INITIATOR_ERROR; } } else { /* This shouldn't happen ever. */ ESPSTAT(("got bolixed\n")); esp_advance_phase(SCptr, in_the_dark); return esp_do_phase_determine(esp, eregs); } if(!message_out) { ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, SCptr->SCp.Message)); if(SCptr->SCp.Message == COMMAND_COMPLETE) { ESPSTAT(("and was COMMAND_COMPLETE\n")); esp_advance_phase(SCptr, in_freeing); return esp_do_freebus(esp, eregs); } else { ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", esp->esp_id)); esp->msgin_len = esp->msgin_ctr = 1; esp_advance_phase(SCptr, in_msgindone); return esp_do_msgindone(esp, eregs); } } else { /* With luck we'll be able to let the target * know that bad parity happened, it will know * which byte caused the problems and send it * again. For the case where the status byte * receives bad parity, I do not believe most * targets recover very well. We'll see. */ ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", esp->esp_id, message_out)); esp->cur_msgout[0] = message_out; esp->msgout_len = esp->msgout_ctr = 1; esp_advance_phase(SCptr, in_the_dark); return esp_do_phase_determine(esp, eregs); } } else { /* If we disconnect now, all hell breaks loose. */ ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); esp_advance_phase(SCptr, in_the_dark); return esp_do_phase_determine(esp, eregs); } } /* The target has control of the bus and we have to see where it has * taken us. */ static int esp_do_phase_determine(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; ESPPHASE(("esp_do_phase_determine: ")); if(!(esp->ireg & ESP_INTR_DC)) { switch(esp->sreg & ESP_STAT_PMASK) { case ESP_DOP: case ESP_DIP: ESPPHASE(("to data phase\n")); return esp_do_data(esp, eregs); case ESP_STATP: /* Whee, status phase, finish up the command. */ ESPPHASE(("to status phase\n")); esp_cmd(esp, eregs, ESP_CMD_FLUSH); if(esp->do_pio_cmds){ esp_advance_phase(SCptr, in_status); esp_cmd(esp, eregs, ESP_CMD_ICCSEQ); while(!(GETREG(esp->eregs->esp_status) & ESP_STAT_INTR)); esp->esp_command[0] = GETREG(eregs->esp_fdata); while(!(GETREG(esp->eregs->esp_status) & ESP_STAT_INTR)); esp->esp_command[1] = GETREG(eregs->esp_fdata); } else { if(esp->erev != fashme) { esp->esp_command[0] = 0xff; esp->esp_command[1] = 0xff; SETREG(eregs->esp_tclow, 2); SETREG(eregs->esp_tcmed, 0); esp->dma_init_read(esp, esp->esp_command_dvma, 2); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_ICCSEQ); } else { /* Using DVMA for status/message bytes is * unreliable on HME, nice job QLogic. * Happy Meal indeed.... */ esp_cmd(esp, eregs, ESP_CMD_ICCSEQ); } esp_advance_phase(SCptr, in_status); } return esp_do_status(esp, eregs); case ESP_MOP: ESPPHASE(("to msgout phase\n")); esp_advance_phase(SCptr, in_msgout); return esp_do_msgout(esp, eregs); case ESP_MIP: ESPPHASE(("to msgin phase\n")); esp_advance_phase(SCptr, in_msgin); return esp_do_msgin(esp, eregs); case ESP_CMDP: /* Ugh, we're running a non-standard command the * ESP doesn't understand, one byte at a time. */ ESPPHASE(("to cmd phase\n")); esp_advance_phase(SCptr, in_cmdbegin); return esp_do_cmdbegin(esp, eregs); }; } else { Scsi_Device *dp = SCptr->device; /* This means real problems if we see this * here. Unless we were actually trying * to force the device to abort/reset. */ ESPLOG(("esp%d Disconnect amidst phases, ", esp->esp_id)); ESPLOG(("pphase<%s> cphase<%s>, ", phase_string(SCptr->SCp.phase), phase_string(SCptr->SCp.sent_command))); if(esp->disconnected_SC || (esp->erev == fashme)) esp_cmd(esp, eregs, ESP_CMD_ESEL); switch(esp->cur_msgout[0]) { default: /* We didn't expect this to happen at all. */ ESPLOG(("device is bolixed\n")); esp_advance_phase(SCptr, in_tgterror); esp_done(esp, (DID_ERROR << 16)); break; case BUS_DEVICE_RESET: ESPLOG(("device reset successful\n")); dp->sync_max_offset = 0; dp->sync_min_period = 0; dp->sync = 0; esp_advance_phase(SCptr, in_resetdev); esp_done(esp, (DID_RESET << 16)); break; case ABORT: ESPLOG(("device abort successful\n")); esp_advance_phase(SCptr, in_abortone); esp_done(esp, (DID_ABORT << 16)); break; }; return do_intr_end; } ESPLOG(("esp%d: to unknown phase\n", esp->esp_id)); printk("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, esp->sreg & ESP_STAT_PMASK); return do_reset_bus; } /* First interrupt after exec'ing a cmd comes here. */ static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; Scsi_Device *SDptr = SCptr->device; int cmd_bytes_sent, fcnt; if(esp->erev != fashme) esp->seqreg = (GETREG(eregs->esp_sstep) & ESP_STEP_VBITS); if(esp->erev == fashme) fcnt = esp->hme_fifo_workaround_count; else fcnt = (GETREG(eregs->esp_fflags) & ESP_FF_FBYTES); cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt); if(esp->dma_invalidate) esp->dma_invalidate(esp); /* Let's check to see if a reselect happened * while we we're trying to select. This must * be checked first. */ if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { esp_reconnect(esp, SCptr); return esp_do_reconnect(esp, eregs); } /* Looks like things worked, we should see a bus service & * a function complete interrupt at this point. Note we * are doing a direct comparison because we don't want to * be fooled into thinking selection was successful if * ESP_INTR_DC is set, see below. */ if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { /* target speaks... */ esp->targets_present |= (1<target); /* What if the target ignores the sdtr? */ if(esp->snip) SDptr->sync = 1; /* See how far, if at all, we got in getting * the information out to the target. */ switch(esp->seqreg) { default: case ESP_STEP_ASEL: /* Arbitration won, target selected, but * we are in some phase which is not command * phase nor is it message out phase. * * XXX We've confused the target, obviously. * XXX So clear it's state, but we also end * XXX up clearing everyone elses. That isn't * XXX so nice. I'd like to just reset this * XXX target, but if I cannot even get it's * XXX attention and finish selection to talk * XXX to it, there is not much more I can do. * XXX If we have a loaded bus we're going to * XXX spend the next second or so renegotiating * XXX for synchronous transfers. */ ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", esp->esp_id, SCptr->target)); case ESP_STEP_SID: /* Arbitration won, target selected, went * to message out phase, sent one message * byte, then we stopped. ATN is asserted * on the SCSI bus and the target is still * there hanging on. This is a legal * sequence step if we gave the ESP a select * and stop command. * * XXX See above, I could set the borken flag * XXX in the device struct and retry the * XXX command. But would that help for * XXX tagged capable targets? */ case ESP_STEP_NCMD: /* Arbitration won, target selected, maybe * sent the one message byte in message out * phase, but we did not go to command phase * in the end. Actually, we could have sent * only some of the message bytes if we tried * to send out the entire identify and tag * message using ESP_CMD_SA3. */ cmd_bytes_sent = 0; break; case ESP_STEP_PPC: /* No, not the powerPC pinhead. Arbitration * won, all message bytes sent if we went to * message out phase, went to command phase * but only part of the command was sent. * * XXX I've seen this, but usually in conjunction * XXX with a gross error which appears to have * XXX occurred between the time I told the * XXX ESP to arbitrate and when I got the * XXX interrupt. Could I have misloaded the * XXX command bytes into the fifo? Actually, * XXX I most likely missed a phase, and therefore * XXX went into never never land and didn't even * XXX know it. That was the old driver though. * XXX What is even more peculiar is that the ESP * XXX showed the proper function complete and * XXX bus service bits in the interrupt register. */ case ESP_STEP_FINI4: case ESP_STEP_FINI5: case ESP_STEP_FINI6: case ESP_STEP_FINI7: /* Account for the identify message */ if(SCptr->SCp.phase == in_slct_norm) cmd_bytes_sent -= 1; }; if(esp->erev != fashme) esp_cmd(esp, eregs, ESP_CMD_NULL); /* Be careful, we could really get fucked during synchronous * data transfers if we try to flush the fifo now. */ if((esp->erev != fashme) && /* not a Happy Meal and... */ !fcnt && /* Fifo is empty and... */ /* either we are not doing synchronous transfers or... */ (!SDptr->sync_max_offset || /* We are not going into data in phase. */ ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */ /* See how far we got if this is not a slow command. */ if(!esp->esp_slowcmd) { if(cmd_bytes_sent < 0) cmd_bytes_sent = 0; if(cmd_bytes_sent != SCptr->cmd_len) { /* Crapola, mark it as a slowcmd * so that we have some chance of * keeping the command alive with * good luck. * * XXX Actually, if we didn't send it all * XXX this means either we didn't set things * XXX up properly (driver bug) or the target * XXX or the ESP detected parity on one of * XXX the command bytes. This makes much * XXX more sense, and therefore this code * XXX should be changed to send out a * XXX parity error message or if the status * XXX register shows no parity error then * XXX just expect the target to bring the * XXX bus into message in phase so that it * XXX can send us the parity error message. * XXX SCSI sucks... */ esp->esp_slowcmd = 1; esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); } } /* Now figure out where we went. */ esp_advance_phase(SCptr, in_the_dark); return esp_do_phase_determine(esp, eregs); } /* Did the target even make it? */ if(esp->ireg == ESP_INTR_DC) { /* wheee... nobody there or they didn't like * what we told it to do, clean up. */ /* If anyone is off the bus, but working on * a command in the background for us, tell * the ESP to listen for them. */ if(esp->disconnected_SC) esp_cmd(esp, eregs, ESP_CMD_ESEL); if(((1<target) & esp->targets_present) && esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE && (SCptr->SCp.phase == in_slct_msg || SCptr->SCp.phase == in_slct_stop)) { /* shit */ esp->snip = 0; printk("esp%d: Failed synchronous negotiation for target %d " "lun %d\n", esp->esp_id, SCptr->target, SCptr->lun); SDptr->sync_max_offset = 0; SDptr->sync_min_period = 0; SDptr->sync = 1; /* so we don't negotiate again */ /* Run the command again, this time though we * won't try to negotiate for synchronous transfers. * * XXX I'd like to do something like send an * XXX INITIATOR_ERROR or ABORT message to the * XXX target to tell it, "Sorry I confused you, * XXX please come back and I will be nicer next * XXX time". But that requires having the target * XXX on the bus, and it has dropped BSY on us. */ esp->current_SC = NULL; esp_advance_phase(SCptr, not_issued); prepend_SC(&esp->issue_SC, SCptr); esp_exec_cmd(esp); return do_intr_end; } /* Ok, this is normal, this is what we see during boot * or whenever when we are scanning the bus for targets. * But first make sure that is really what is happening. */ if(((1<target) & esp->targets_present)) { printk("esp%d: Warning, live target %d not responding to " "selection.\n", esp->esp_id, SCptr->target); /* This _CAN_ happen. The SCSI standard states that * the target is to _not_ respond to selection if * _it_ detects bad parity on the bus for any reason. * Therefore, we assume that if we've talked successfully * to this target before, bad parity is the problem. */ esp_done(esp, (DID_PARITY << 16)); } else { /* Else, there really isn't anyone there. */ ESPMISC(("esp: selection failure, maybe nobody there?\n")); ESPMISC(("esp: target %d lun %d\n", SCptr->target, SCptr->lun)); esp_done(esp, (DID_BAD_TARGET << 16)); } return do_intr_end; } ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); printk("esp%d: Currently -- ", esp->esp_id); esp_print_ireg(esp->ireg); printk(" "); esp_print_statreg(esp->sreg); printk(" "); esp_print_seqreg(esp->seqreg); printk("\n"); printk("esp%d: New -- ", esp->esp_id); esp->sreg = GETREG(eregs->esp_status); esp->seqreg = GETREG(eregs->esp_sstep); esp->ireg = GETREG(eregs->esp_intrpt); esp_print_ireg(esp->ireg); printk(" "); esp_print_statreg(esp->sreg); printk(" "); esp_print_seqreg(esp->seqreg); printk("\n"); ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); return do_reset_bus; /* ugh... */ } /* Continue reading bytes for msgin phase. */ static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs) { if(esp->ireg & ESP_INTR_BSERV) { /* in the right phase too? */ if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { /* phew... */ esp_cmd(esp, eregs, ESP_CMD_TI); esp_advance_phase(esp->current_SC, in_msgindone); return do_intr_end; } /* We changed phase but ESP shows bus service, * in this case it is most likely that we, the * hacker who has been up for 20hrs straight * staring at the screen, drowned in coffee * smelling like retched cigarette ashes * have miscoded something..... so, try to * recover as best we can. */ printk("esp%d: message in mis-carriage.\n", esp->esp_id); } esp_advance_phase(esp->current_SC, in_the_dark); return do_phase_determine; } static inline int check_singlebyte_msg(struct NCR_ESP *esp, struct ESP_regs *eregs) { esp->prevmsgin = esp->cur_msgin[0]; if(esp->cur_msgin[0] & 0x80) { /* wheee... */ ESPLOG(("esp%d: target sends identify amidst phases\n", esp->esp_id)); esp_advance_phase(esp->current_SC, in_the_dark); return 0; } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) || (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { esp->msgin_len = 2; esp_advance_phase(esp->current_SC, in_msgincont); return 0; } esp_advance_phase(esp->current_SC, in_the_dark); switch(esp->cur_msgin[0]) { default: /* We don't want to hear about it. */ ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, esp->cur_msgin[0])); return MESSAGE_REJECT; case NOP: ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, esp->current_SC->target)); return 0; case RESTORE_POINTERS: case SAVE_POINTERS: /* We handle this all automatically. */ return 0; case COMMAND_COMPLETE: case DISCONNECT: /* Freeing the bus, let it go. */ esp->current_SC->SCp.phase = in_freeing; return 0; case MESSAGE_REJECT: ESPMISC(("msg reject, ")); if(esp->prevmsgout == EXTENDED_MESSAGE) { Scsi_Device *SDptr = esp->current_SC->device; /* Doesn't look like this target can * do synchronous or WIDE transfers. */ ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); SDptr->sync = 1; SDptr->wide = 1; SDptr->sync_min_period = 0; SDptr->sync_max_offset = 0; return 0; } else { ESPMISC(("not sync nego, sending ABORT\n")); return ABORT; } }; } /* Target negotiates for synchronous transfers before we do, this * is legal although very strange. What is even funnier is that * the SCSI2 standard specifically recommends against targets doing * this because so many initiators cannot cope with this occuring. */ static inline int target_with_ants_in_pants(struct NCR_ESP *esp, Scsi_Cmnd *SCptr, Scsi_Device *SDptr) { if(SDptr->sync || SDptr->borken) { /* sorry, no can do */ ESPSDTR(("forcing to async, ")); build_sync_nego_msg(esp, 0, 0); SDptr->sync = 1; esp->snip = 1; ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); esp_advance_phase(SCptr, in_the_dark); return EXTENDED_MESSAGE; } /* Ok, we'll check them out... */ return 0; } static inline void sync_report(struct NCR_ESP *esp) { int msg3, msg4; char *type; msg3 = esp->cur_msgin[3]; msg4 = esp->cur_msgin[4]; if(msg4) { int hz = 1000000000 / (msg3 * 4); int integer = hz / 1000000; int fraction = (hz - (integer * 1000000)) / 10000; if((esp->erev == fashme) && (esp->config3[esp->current_SC->target] & ESP_CONFIG3_EWIDE)) { type = "FAST-WIDE"; integer <<= 1; fraction <<= 1; } else if((msg3 * 4) < 200) { type = "FAST"; } else { type = "synchronous"; } printk(KERN_INFO "esp%d: target %d [period %dns offset %d %d.%02dMHz %s SCSI%s]\n", esp->esp_id, esp->current_SC->target, (int) msg3 * 4, (int) msg4, integer, fraction, type, (((msg3 * 4) < 200) ? "-II" : "")); } else { printk(KERN_INFO "esp%d: target %d asynchronous\n", esp->esp_id, esp->current_SC->target); } } static inline int check_multibyte_msg(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; Scsi_Device *SDptr = SCptr->device; unchar regval = 0; int message_out = 0; ESPSDTR(("chk multibyte msg: ")); if(esp->cur_msgin[2] == EXTENDED_SDTR) { int period = esp->cur_msgin[3]; int offset = esp->cur_msgin[4]; ESPSDTR(("is sync nego response, ")); if(!esp->snip) { int rval; /* Target negotiates first! */ ESPSDTR(("target jumps the gun, ")); message_out = EXTENDED_MESSAGE; /* we must respond */ rval = target_with_ants_in_pants(esp, SCptr, SDptr); if(rval) return rval; } ESPSDTR(("examining sdtr, ")); /* Offset cannot be larger than ESP fifo size. */ if(offset > 15) { ESPSDTR(("offset too big %2x, ", offset)); offset = 15; ESPSDTR(("sending back new offset\n")); build_sync_nego_msg(esp, period, offset); return EXTENDED_MESSAGE; } if(offset && period > esp->max_period) { /* Yeee, async for this slow device. */ ESPSDTR(("period too long %2x, ", period)); build_sync_nego_msg(esp, 0, 0); ESPSDTR(("hoping for msgout\n")); esp_advance_phase(esp->current_SC, in_the_dark); return EXTENDED_MESSAGE; } else if (offset && period < esp->min_period) { ESPSDTR(("period too short %2x, ", period)); period = esp->min_period; if(esp->erev > esp236) regval = 4; else regval = 5; } else if(offset) { int tmp; ESPSDTR(("period is ok, ")); tmp = esp->ccycle / 1000; regval = (((period << 2) + tmp - 1) / tmp); if(regval && ((esp->erev == fas100a || esp->erev == fas216 || esp->erev == fas236 || esp->erev == fashme))) { if(period >= 50) regval--; } } if(offset) { unchar bit; SDptr->sync_min_period = (regval & 0x1f); SDptr->sync_max_offset = (offset | esp->radelay); if((esp->erev == fas100a || esp->erev == fas216 || esp->erev == fas236 || esp->erev == fashme)) { if((esp->erev == fas100a) || (esp->erev == fashme)) bit = ESP_CONFIG3_FAST; else bit = ESP_CONFIG3_FSCSI; if(period < 50) esp->config3[SCptr->target] |= bit; else esp->config3[SCptr->target] &= ~bit; SETREG(eregs->esp_cfg3, esp->config3[SCptr->target]); } SETREG(eregs->esp_soff, SDptr->sync_min_period); SETREG(eregs->esp_stp, SDptr->sync_max_offset); ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", SDptr->sync_max_offset, SDptr->sync_min_period, esp->config3[SCptr->target])); esp->snip = 0; } else if(SDptr->sync_max_offset) { unchar bit; /* back to async mode */ ESPSDTR(("unaccaptable sync nego, forcing async\n")); SDptr->sync_max_offset = 0; SDptr->sync_min_period = 0; SETREG(eregs->esp_soff, 0); SETREG(eregs->esp_stp, 0); if((esp->erev == fas100a || esp->erev == fas216 || esp->erev == fas236 || esp->erev == fashme)) { if((esp->erev == fas100a) || (esp->erev == fashme)) bit = ESP_CONFIG3_FAST; else bit = ESP_CONFIG3_FSCSI; esp->config3[SCptr->target] &= ~bit; SETREG(eregs->esp_cfg3, esp->config3[SCptr->target]); } } sync_report(esp); ESPSDTR(("chk multibyte msg: sync is known, ")); SDptr->sync = 1; if(message_out) { ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", esp->esp_id)); build_sync_nego_msg(esp, period, offset); esp_advance_phase(SCptr, in_the_dark); return EXTENDED_MESSAGE; } ESPSDTR(("returning zero\n")); esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ return 0; } else if(esp->cur_msgin[2] == EXTENDED_WDTR) { int size = 8 << esp->cur_msgin[3]; esp->wnip = 0; if(esp->erev != fashme) { printk("esp%d: AIEEE wide msg received and not HME.\n", esp->esp_id); message_out = MESSAGE_REJECT; } else if(size > 16) { printk("esp%d: AIEEE wide transfer for %d size not supported.\n", esp->esp_id, size); message_out = MESSAGE_REJECT; } else { /* Things look good; let's see what we got. */ if(size == 16) { /* Set config 3 register for this target. */ printk("esp%d: 16 byte WIDE transfers enabled for target %d.\n", esp->esp_id, SCptr->target); esp->config3[SCptr->target] |= ESP_CONFIG3_EWIDE; } else { /* Just make sure it was one byte sized. */ if(size != 8) { printk("esp%d: Aieee, wide nego of %d size.\n", esp->esp_id, size); message_out = MESSAGE_REJECT; goto finish; } /* Pure paranoia. */ esp->config3[SCptr->target] &= ~(ESP_CONFIG3_EWIDE); } SETREG(eregs->esp_cfg3, esp->config3[SCptr->target]); /* Regardless, next try for sync transfers. */ build_sync_nego_msg(esp, esp->sync_defp, 15); SDptr->sync = 1; esp->snip = 1; message_out = EXTENDED_MESSAGE; } } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); message_out = MESSAGE_REJECT; } finish: esp_advance_phase(SCptr, in_the_dark); return message_out; } static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; int message_out = 0, it = 0, rval; rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone); if(rval) return rval; if(SCptr->SCp.sent_command != in_status) { if(!(esp->ireg & ESP_INTR_DC)) { if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { message_out = MSG_PARITY_ERROR; esp_cmd(esp, eregs, ESP_CMD_FLUSH); } else if(esp->erev != fashme && (it = (GETREG(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) { /* We certainly dropped the ball somewhere. */ message_out = INITIATOR_ERROR; esp_cmd(esp, eregs, ESP_CMD_FLUSH); } else if(!esp->msgin_len) { if(esp->erev == fashme) it = esp->hme_fifo_workaround_buffer[0]; else it = GETREG(eregs->esp_fdata); esp_advance_phase(SCptr, in_msgincont); } else { /* it is ok and we want it */ if(esp->erev == fashme) it = esp->cur_msgin[esp->msgin_ctr] = esp->hme_fifo_workaround_buffer[0]; else it = esp->cur_msgin[esp->msgin_ctr] = GETREG(eregs->esp_fdata); esp->msgin_ctr++; } } else { esp_advance_phase(SCptr, in_the_dark); return do_work_bus; } } else { it = esp->cur_msgin[0]; } if(!message_out && esp->msgin_len) { if(esp->msgin_ctr < esp->msgin_len) { esp_advance_phase(SCptr, in_msgincont); } else if(esp->msgin_len == 1) { message_out = check_singlebyte_msg(esp, eregs); } else if(esp->msgin_len == 2) { if(esp->cur_msgin[0] == EXTENDED_MESSAGE) { if((it+2) >= 15) { message_out = MESSAGE_REJECT; } else { esp->msgin_len = (it + 2); esp_advance_phase(SCptr, in_msgincont); } } else { message_out = MESSAGE_REJECT; /* foo on you */ } } else { message_out = check_multibyte_msg(esp, eregs); } } if(message_out < 0) { return -message_out; } else if(message_out) { if(((message_out != 1) && ((message_out < 0x20) || (message_out & 0x80)))) esp->msgout_len = 1; esp->cur_msgout[0] = message_out; esp_cmd(esp, eregs, ESP_CMD_SATN); esp_advance_phase(SCptr, in_the_dark); esp->msgin_len = 0; } esp->sreg = GETREG(eregs->esp_status); esp->sreg &= ~(ESP_STAT_INTR); if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) esp_cmd(esp, eregs, ESP_CMD_MOK); if((SCptr->SCp.sent_command == in_msgindone) && (SCptr->SCp.phase == in_freeing)) return esp_do_freebus(esp, eregs); return do_intr_end; } static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; esp_advance_phase(SCptr, in_cmdend); if(esp->erev == fashme) { int i; for(i = 0; i < esp->esp_scmdleft; i++) esp->esp_command[i] = *esp->esp_scmdp++; esp->esp_scmdleft = 0; esp_cmd(esp, eregs, ESP_CMD_FLUSH); esp_setcount(eregs, i, 1); esp_cmd(esp, eregs, (ESP_CMD_DMA | ESP_CMD_TI)); esp->dma_init_write(esp, esp->esp_command_dvma, i); } else { esp_cmd(esp, eregs, ESP_CMD_FLUSH); SETREG(eregs->esp_fdata, *esp->esp_scmdp++); esp->esp_scmdleft--; esp_cmd(esp, eregs, ESP_CMD_TI); } return do_intr_end; } static inline int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs) { if(esp->erev == fashme){ if(esp->dma_invalidate) esp->dma_invalidate(esp); } else esp_cmd(esp, eregs, ESP_CMD_NULL); if(esp->ireg & ESP_INTR_BSERV) { esp_advance_phase(esp->current_SC, in_the_dark); return esp_do_phase_determine(esp, eregs); } ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", esp->esp_id)); return do_reset_bus; } static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs) { esp_cmd(esp, eregs, ESP_CMD_FLUSH); switch(esp->msgout_len) { case 1: if(esp->erev == fashme) hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 1); else SETREG(eregs->esp_fdata, esp->cur_msgout[0]); esp_cmd(esp, eregs, ESP_CMD_TI); break; case 2: if(esp->do_pio_cmds){ SETREG(eregs->esp_fdata, esp->cur_msgout[0]); SETREG(eregs->esp_fdata, esp->cur_msgout[1]); esp_cmd(esp, eregs, ESP_CMD_TI); } else { esp->esp_command[0] = esp->cur_msgout[0]; esp->esp_command[1] = esp->cur_msgout[1]; if(esp->erev == fashme) { hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 2); esp_cmd(esp, eregs, ESP_CMD_TI); } else { esp->dma_setup(esp, esp->esp_command_dvma, 2, 0); esp_setcount(eregs, 2, 0); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); } } break; case 4: esp->snip = 1; if(esp->do_pio_cmds){ SETREG(eregs->esp_fdata, esp->cur_msgout[0]); SETREG(eregs->esp_fdata, esp->cur_msgout[1]); SETREG(eregs->esp_fdata, esp->cur_msgout[2]); SETREG(eregs->esp_fdata, esp->cur_msgout[3]); esp_cmd(esp, eregs, ESP_CMD_TI); } else { esp->esp_command[0] = esp->cur_msgout[0]; esp->esp_command[1] = esp->cur_msgout[1]; esp->esp_command[2] = esp->cur_msgout[2]; esp->esp_command[3] = esp->cur_msgout[3]; if(esp->erev == fashme) { hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 4); esp_cmd(esp, eregs, ESP_CMD_TI); } else { esp->dma_setup(esp, esp->esp_command_dvma, 4, 0); esp_setcount(eregs, 4, 0); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); } } break; case 5: esp->snip = 1; if(esp->do_pio_cmds){ SETREG(eregs->esp_fdata, esp->cur_msgout[0]); SETREG(eregs->esp_fdata, esp->cur_msgout[1]); SETREG(eregs->esp_fdata, esp->cur_msgout[2]); SETREG(eregs->esp_fdata, esp->cur_msgout[3]); SETREG(eregs->esp_fdata, esp->cur_msgout[4]); esp_cmd(esp, eregs, ESP_CMD_TI); } else { SETREG(esp->esp_command[0], esp->cur_msgout[0]); SETREG(esp->esp_command[1], esp->cur_msgout[1]); SETREG(esp->esp_command[2], esp->cur_msgout[2]); SETREG(esp->esp_command[3], esp->cur_msgout[3]); SETREG(esp->esp_command[4], esp->cur_msgout[4]); if(esp->erev == fashme) { hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 5); esp_cmd(esp, eregs, ESP_CMD_TI); } else { esp->dma_setup(esp, esp->esp_command_dvma, 5, 0); esp_setcount(eregs, 5, 0); esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); } } break; default: /* whoops */ ESPMISC(("bogus msgout sending NOP\n")); esp->cur_msgout[0] = NOP; if(esp->erev == fashme) { hme_fifo_push(esp, eregs, &esp->cur_msgout[0], 1); } else { SETREG(eregs->esp_fdata, esp->cur_msgout[0]); } esp->msgout_len = 1; esp_cmd(esp, eregs, ESP_CMD_TI); break; } esp_advance_phase(esp->current_SC, in_msgoutdone); return do_intr_end; } static inline int esp_do_msgoutdone(struct NCR_ESP *esp, struct ESP_regs *eregs) { if((esp->msgout_len > 1) && esp->dma_barrier) esp->dma_barrier(esp); if(!(esp->ireg & ESP_INTR_DC)) { if(esp->erev != fashme) esp_cmd(esp, eregs, ESP_CMD_NULL); switch(esp->sreg & ESP_STAT_PMASK) { case ESP_MOP: /* whoops, parity error */ ESPLOG(("esp%d: still in msgout, parity error assumed\n", esp->esp_id)); if(esp->msgout_len > 1) esp_cmd(esp, eregs, ESP_CMD_SATN); esp_advance_phase(esp->current_SC, in_msgout); return do_work_bus; case ESP_DIP: break; default: /* Happy Meal fifo is touchy... */ if((esp->erev != fashme) && !fcount(esp, eregs) && !(esp->current_SC->device->sync_max_offset)) esp_cmd(esp, eregs, ESP_CMD_FLUSH); break; }; } else { ESPLOG(("esp%d: disconnect, resetting bus\n", esp->esp_id)); return do_reset_bus; } /* If we sent out a synchronous negotiation message, update * our state. */ if(esp->cur_msgout[2] == EXTENDED_MESSAGE && esp->cur_msgout[4] == EXTENDED_SDTR) { esp->snip = 1; /* anal retentiveness... */ } esp->prevmsgout = esp->cur_msgout[0]; esp->msgout_len = 0; esp_advance_phase(esp->current_SC, in_the_dark); return esp_do_phase_determine(esp, eregs); } /* This is the second tier in our dual-level SCSI state machine. */ static inline int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs) { Scsi_Cmnd *SCptr = esp->current_SC; ESPBUS(("esp_work_bus: ")); if(!SCptr) { ESPBUS(("reconnect\n")); return esp_do_reconnect(esp, eregs); } switch(SCptr->SCp.phase) { case in_the_dark: ESPBUS(("in the dark\n")); return esp_do_phase_determine(esp, eregs); case in_slct_norm: case in_slct_stop: case in_slct_msg: case in_slct_tag: case in_slct_sneg: ESPBUS(("finish selection\n")); return esp_select_complete(esp, eregs); case in_datain: case in_dataout: ESPBUS(("finish data\n")); return esp_do_data_finale(esp, eregs); case in_msgout: ESPBUS(("message out ")); return esp_do_msgout(esp, eregs); case in_msgoutdone: ESPBUS(("finish message out ")); return esp_do_msgoutdone(esp, eregs); case in_msgin: ESPBUS(("message in ")); return esp_do_msgin(esp, eregs); case in_msgincont: ESPBUS(("continue message in ")); return esp_do_msgincont(esp, eregs); case in_msgindone: ESPBUS(("finish message in ")); return esp_do_msgindone(esp, eregs); case in_status: ESPBUS(("status phase ")); return esp_do_status(esp, eregs); case in_freeing: ESPBUS(("freeing the bus ")); return esp_do_freebus(esp, eregs); case in_cmdbegin: ESPBUS(("begin slow cmd ")); return esp_do_cmdbegin(esp, eregs); case in_cmdend: ESPBUS(("end slow cmd ")); return esp_do_cmddone(esp, eregs); default: printk("esp%d: command in weird state %2x\n", esp->esp_id, esp->current_SC->SCp.phase); return do_reset_bus; }; } /* Main interrupt handler for an esp adapter. */ inline void esp_handle(struct NCR_ESP *esp) { struct ESP_regs *eregs; Scsi_Cmnd *SCptr; int what_next = do_intr_end; #ifdef CONFIG_SCSI_SUNESP struct sparc_dma_registers *dregs = (struct sparc_dma_registers*) esp->dregs; #endif eregs = esp->eregs; SCptr = esp->current_SC; if(esp->dma_irq_entry) esp->dma_irq_entry(esp); /* Check for errors. */ esp->sreg = GETREG(eregs->esp_status); esp->sreg &= (~ESP_STAT_INTR); if(esp->erev == fashme) { esp->sreg2 = GETREG(eregs->esp_status2); esp->seqreg = (GETREG(eregs->esp_sstep) & ESP_STEP_VBITS); } if(esp->sreg & (ESP_STAT_SPAM)) { /* Gross error, could be due to one of: * * - top of fifo overwritten, could be because * we tried to do a synchronous transfer with * an offset greater than ESP fifo size * * - top of command register overwritten * * - DMA setup to go in one direction, SCSI * bus points in the other, whoops * * - weird phase change during asynchronous * data phase while we are initiator */ ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); /* If a command is live on the bus we cannot safely * reset the bus, so we'll just let the pieces fall * where they may. Here we are hoping that the * target will be able to cleanly go away soon * so we can safely reset things. */ if(!SCptr) { ESPLOG(("esp%d: No current cmd during gross error, " "resetting bus\n", esp->esp_id)); what_next = do_reset_bus; goto again; } } #ifdef CONFIG_SCSI_SUNESP if(dregs->cond_reg & DMA_HNDL_ERROR) { /* A DMA gate array error. Here we must * be seeing one of two things. Either the * virtual to physical address translation * on the SBUS could not occur, else the * translation it did get pointed to a bogus * page. Ho hum... */ ESPLOG(("esp%d: DMA error %08x\n", esp->esp_id, dregs->cond_reg)); /* DMA gate array itself must be reset to clear the * error condition. */ if(esp->dma_reset) esp->dma_reset(esp); what_next = do_reset_bus; goto again; } #endif /* CONFIG_SCSI_SUNESP */ if(esp->erev == fashme) { /* This chip is really losing. */ ESPHME(("HME[")); ESPHME(("sreg2=%02x,", esp->sreg2)); /* Must latch fifo before reading the interrupt * register else garbage ends up in the FIFO * which confuses the driver utterly. */ if(!(esp->sreg2 & ESP_STAT2_FEMPTY) || (esp->sreg2 & ESP_STAT2_F1BYTE)) { ESPHME(("fifo_workaround]")); hme_fifo_hwbug_workaround(esp, eregs); } else { ESPHME(("no_fifo_workaround]")); } } esp->ireg = GETREG(eregs->esp_intrpt); /* Unlatch intr and stat regs */ /* This cannot be done until this very moment. -DaveM */ synchronize_irq(); /* No current cmd is only valid at this point when there are * commands off the bus or we are trying a reset. */ if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { /* Panic is safe, since current_SC is null. */ ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); panic("esp_handle: current_SC == penguin within interrupt!"); } if(esp->ireg & (ESP_INTR_IC)) { /* Illegal command fed to ESP. Outside of obvious * software bugs that could cause this, there is * a condition with esp100 where we can confuse the * ESP into an erroneous illegal command interrupt * because it does not scrape the FIFO properly * for reselection. See esp100_reconnect_hwbug() * to see how we try very hard to avoid this. */ ESPLOG(("esp%d: illegal command\n", esp->esp_id)); esp_dump_state(esp, eregs); if(SCptr) { /* Devices with very buggy firmware can drop BSY * during a scatter list interrupt when using sync * mode transfers. We continue the transfer as * expected, the target drops the bus, the ESP * gets confused, and we get a illegal command * interrupt because the bus is in the disconnected * state now and ESP_CMD_TI is only allowed when * a nexus is alive on the bus. */ ESPLOG(("esp%d: Forcing async and disabling disconnect for " "target %d\n", esp->esp_id, SCptr->target)); SCptr->device->borken = 1; /* foo on you */ } what_next = do_reset_bus; goto again; } if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { int phase; if(SCptr) { phase = SCptr->SCp.phase; if(phase & in_phases_mask) { what_next = esp_work_bus(esp, eregs); } else if(phase & in_slct_mask) { what_next = esp_select_complete(esp, eregs); } else { ESPLOG(("esp%d: interrupt for no good reason...\n", esp->esp_id)); goto esp_handle_done; } } else { ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", esp->esp_id)); what_next = do_reset_bus; goto again; } } else if(esp->ireg & ESP_INTR_SR) { ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); what_next = do_reset_complete; } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", esp->esp_id)); what_next = do_reset_bus; goto again; } else if(esp->ireg & ESP_INTR_RSEL) { if(!SCptr) { /* This is ok. */ what_next = esp_do_reconnect(esp, eregs); } else if(SCptr->SCp.phase & in_slct_mask) { /* Only selection code knows how to clean * up properly. */ ESPDISC(("Reselected during selection attempt\n")); what_next = esp_select_complete(esp, eregs); } else { ESPLOG(("esp%d: Reselected while bus is busy\n", esp->esp_id)); what_next = do_reset_bus; goto again; } } /* We're trying to fight stack problems, and inline as much as * possible without making this driver a mess. hate hate hate * This is tier-one in our dual level SCSI state machine. */ again: switch(what_next) { case do_intr_end: goto esp_handle_done; case do_work_bus: what_next = esp_work_bus(esp, eregs); break; case do_phase_determine: what_next = esp_do_phase_determine(esp, eregs); break; case do_reset_bus: ESPLOG(("esp%d: resetting bus...\n", esp->esp_id)); esp->resetting_bus = 1; esp_cmd(esp, eregs, ESP_CMD_RS); goto esp_handle_done; case do_reset_complete: /* Tricky, we don't want to cause any more commands to * go out until we clear all the live cmds by hand. */ if(esp->current_SC) { Scsi_Cmnd *SCptr = esp->current_SC; if(!SCptr->use_sg) { if (esp->dma_mmu_release_scsi_one) esp->dma_mmu_release_scsi_one (esp, SCptr); } else { if (esp->dma_mmu_release_scsi_sgl) esp->dma_mmu_release_scsi_sgl (esp, SCptr); } SCptr->result = (DID_RESET << 16); SCptr->scsi_done(SCptr); } esp->current_SC = NULL; if(esp->disconnected_SC) { Scsi_Cmnd *SCptr; while((SCptr = remove_first_SC(&esp->disconnected_SC))) { if(!SCptr->use_sg) { if (esp->dma_mmu_release_scsi_one) esp->dma_mmu_release_scsi_one (esp, SCptr); } else { if (esp->dma_mmu_release_scsi_sgl) esp->dma_mmu_release_scsi_sgl (esp, SCptr); } SCptr->result = (DID_RESET << 16); SCptr->scsi_done(SCptr); } } esp->resetting_bus = 0; if(esp->current_SC) { printk("esp%d: weird weird weird, current_SC not NULL after " "SCSI bus reset.\n", esp->esp_id); goto esp_handle_done; } /* Now it is safe to execute more things. */ if(esp->issue_SC) esp_exec_cmd(esp); goto esp_handle_done; default: /* state is completely lost ;-( */ ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", esp->esp_id)); what_next = do_reset_bus; break; }; goto again; esp_handle_done: if(esp->dma_irq_exit) esp->dma_irq_exit(esp); return; } #ifndef __sparc_v9__ #ifndef __SMP__ void esp_intr(int irq, void *dev_id, struct pt_regs *pregs) { struct NCR_ESP *esp; int again; /* Handle all ESP interrupts showing at this IRQ level. */ repeat: again = 0; for_each_esp(esp) { #ifndef __mips__ if(((esp)->irq & 0xf) == irq) { #endif if(esp->dma_irq_p(esp)) { again = 1; esp->dma_ints_off(esp); ESPIRQ(("I%d(", esp->esp_id)); esp_handle(esp); ESPIRQ((")")); esp->dma_ints_on(esp); } #ifndef __mips__ } #endif } if(again) goto repeat; } #else /* For SMP we only service one ESP on the list list at our IRQ level! */ void esp_intr(int irq, void *dev_id, struct pt_regs *pregs) { struct NCR_ESP *esp; /* Handle all ESP interrupts showing at this IRQ level. */ for_each_esp(esp) { if(((esp)->irq & 0xf) == irq) { if(esp->dma_irq_p(esp)) { esp->dma_ints_off(esp); ESPIRQ(("I[%d:%d](", smp_processor_id(), esp->esp_id)); esp_handle(esp); ESPIRQ((")")); esp->dma_ints_on(esp); return; } } } } #endif #else /* __sparc_v9__ */ static void esp_intr(int irq, void *dev_id, struct pt_regs *pregs) { struct NCR_ESP *esp = dev_id; if(esp->dma_irq_p(esp)) { esp->dma_ints_off(dregs); ESPIRQ(("I[%d:%d](", smp_processor_id(), esp->esp_id)); esp_handle(esp); ESPIRQ((")")); esp->dma_ints_on(esp); } } #endif