diff options
| author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
| commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
| tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/scsi/NCR53C9x.c | |
| download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 | |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/scsi/NCR53C9x.c')
| -rw-r--r-- | drivers/scsi/NCR53C9x.c | 3649 |
1 files changed, 3649 insertions, 0 deletions
diff --git a/drivers/scsi/NCR53C9x.c b/drivers/scsi/NCR53C9x.c new file mode 100644 index 000000000000..3c86655a5f33 --- /dev/null +++ b/drivers/scsi/NCR53C9x.c @@ -0,0 +1,3649 @@ +/* NCR53C9x.c: Generic SCSI driver code for NCR53C9x chips. + * + * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code. + * + * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu) + * + * Most DMA dependencies put in driver specific files by + * Jesper Skov (jskov@cygnus.co.uk) + * + * Set up to use esp_read/esp_write (preprocessor macros in NCR53c9x.h) by + * Tymm Twillman (tymm@coe.missouri.edu) + */ + +/* TODO: + * + * 1) Maybe disable parity checking in config register one for SCSI1 + * targets. (Gilmore says parity error on the SBus can lock up + * old sun4c's) + * 2) Add support for DMA2 pipelining. + * 3) Add tagged queueing. + * 4) Maybe change use of "esp" to something more "NCR"'ish. + */ + +#include <linux/module.h> + +#include <linux/config.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/blkdev.h> +#include <linux/interrupt.h> +#include <linux/proc_fs.h> +#include <linux/stat.h> +#include <linux/init.h> + +#include "scsi.h" +#include <scsi/scsi_host.h> +#include "NCR53C9x.h" + +#include <asm/system.h> +#include <asm/ptrace.h> +#include <asm/pgtable.h> +#include <asm/io.h> +#include <asm/irq.h> + +/* Command phase enumeration. */ +enum { + not_issued = 0x00, /* Still in the issue_SC queue. */ + + /* Various forms of selecting a target. */ +#define in_slct_mask 0x10 + in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ + in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ + in_slct_msg = 0x12, /* select, then send a message */ + in_slct_tag = 0x13, /* select and send tagged queue msg */ + in_slct_sneg = 0x14, /* select and acquire sync capabilities */ + + /* Any post selection activity. */ +#define in_phases_mask 0x20 + in_datain = 0x20, /* Data is transferring from the bus */ + in_dataout = 0x21, /* Data is transferring to the bus */ + in_data_done = 0x22, /* Last DMA data operation done (maybe) */ + in_msgin = 0x23, /* Eating message from target */ + in_msgincont = 0x24, /* Eating more msg bytes from target */ + in_msgindone = 0x25, /* Decide what to do with what we got */ + in_msgout = 0x26, /* Sending message to target */ + in_msgoutdone = 0x27, /* Done sending msg out */ + in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ + in_cmdend = 0x29, /* Done sending slow cmd */ + in_status = 0x2a, /* Was in status phase, finishing cmd */ + in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ + in_the_dark = 0x2c, /* Don't know what bus phase we are in */ + + /* Special states, ie. not normal bus transitions... */ +#define in_spec_mask 0x80 + in_abortone = 0x80, /* Aborting one command currently */ + in_abortall = 0x81, /* Blowing away all commands we have */ + in_resetdev = 0x82, /* SCSI target reset in progress */ + in_resetbus = 0x83, /* SCSI bus reset in progress */ + in_tgterror = 0x84, /* Target did something stupid */ +}; + +enum { + /* Zero has special meaning, see skipahead[12]. */ +/*0*/ do_never, + +/*1*/ do_phase_determine, +/*2*/ do_reset_bus, +/*3*/ do_reset_complete, +/*4*/ do_work_bus, +/*5*/ do_intr_end +}; + +/* The master ring of all esp hosts we are managing in this driver. */ +struct NCR_ESP *espchain; +int nesps = 0, esps_in_use = 0, esps_running = 0; + +irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs); + +/* Debugging routines */ +static struct esp_cmdstrings { + unchar cmdchar; + char *text; +} esp_cmd_strings[] = { + /* Miscellaneous */ + { ESP_CMD_NULL, "ESP_NOP", }, + { ESP_CMD_FLUSH, "FIFO_FLUSH", }, + { ESP_CMD_RC, "RSTESP", }, + { ESP_CMD_RS, "RSTSCSI", }, + /* Disconnected State Group */ + { ESP_CMD_RSEL, "RESLCTSEQ", }, + { ESP_CMD_SEL, "SLCTNATN", }, + { ESP_CMD_SELA, "SLCTATN", }, + { ESP_CMD_SELAS, "SLCTATNSTOP", }, + { ESP_CMD_ESEL, "ENSLCTRESEL", }, + { ESP_CMD_DSEL, "DISSELRESEL", }, + { ESP_CMD_SA3, "SLCTATN3", }, + { ESP_CMD_RSEL3, "RESLCTSEQ", }, + /* Target State Group */ + { ESP_CMD_SMSG, "SNDMSG", }, + { ESP_CMD_SSTAT, "SNDSTATUS", }, + { ESP_CMD_SDATA, "SNDDATA", }, + { ESP_CMD_DSEQ, "DISCSEQ", }, + { ESP_CMD_TSEQ, "TERMSEQ", }, + { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, + { ESP_CMD_DCNCT, "DISC", }, + { ESP_CMD_RMSG, "RCVMSG", }, + { ESP_CMD_RCMD, "RCVCMD", }, + { ESP_CMD_RDATA, "RCVDATA", }, + { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, + /* Initiator State Group */ + { ESP_CMD_TI, "TRANSINFO", }, + { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, + { ESP_CMD_MOK, "MSGACCEPTED", }, + { ESP_CMD_TPAD, "TPAD", }, + { ESP_CMD_SATN, "SATN", }, + { ESP_CMD_RATN, "RATN", }, +}; +#define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) + +/* Print textual representation of an ESP command */ +static inline void esp_print_cmd(unchar espcmd) +{ + unchar dma_bit = espcmd & ESP_CMD_DMA; + int i; + + espcmd &= ~dma_bit; + for(i=0; i<NUM_ESP_COMMANDS; i++) + if(esp_cmd_strings[i].cmdchar == espcmd) + break; + if(i==NUM_ESP_COMMANDS) + printk("ESP_Unknown"); + else + printk("%s%s", esp_cmd_strings[i].text, + ((dma_bit) ? "+DMA" : "")); +} + +/* Print the status register's value */ +static inline void esp_print_statreg(unchar statreg) +{ + unchar phase; + + printk("STATUS<"); + phase = statreg & ESP_STAT_PMASK; + printk("%s,", (phase == ESP_DOP ? "DATA-OUT" : + (phase == ESP_DIP ? "DATA-IN" : + (phase == ESP_CMDP ? "COMMAND" : + (phase == ESP_STATP ? "STATUS" : + (phase == ESP_MOP ? "MSG-OUT" : + (phase == ESP_MIP ? "MSG_IN" : + "unknown"))))))); + if(statreg & ESP_STAT_TDONE) + printk("TRANS_DONE,"); + if(statreg & ESP_STAT_TCNT) + printk("TCOUNT_ZERO,"); + if(statreg & ESP_STAT_PERR) + printk("P_ERROR,"); + if(statreg & ESP_STAT_SPAM) + printk("SPAM,"); + if(statreg & ESP_STAT_INTR) + printk("IRQ,"); + printk(">"); +} + +/* Print the interrupt register's value */ +static inline void esp_print_ireg(unchar intreg) +{ + printk("INTREG< "); + if(intreg & ESP_INTR_S) + printk("SLCT_NATN "); + if(intreg & ESP_INTR_SATN) + printk("SLCT_ATN "); + if(intreg & ESP_INTR_RSEL) + printk("RSLCT "); + if(intreg & ESP_INTR_FDONE) + printk("FDONE "); + if(intreg & ESP_INTR_BSERV) + printk("BSERV "); + if(intreg & ESP_INTR_DC) + printk("DISCNCT "); + if(intreg & ESP_INTR_IC) + printk("ILL_CMD "); + if(intreg & ESP_INTR_SR) + printk("SCSI_BUS_RESET "); + printk(">"); +} + +/* Print the sequence step registers contents */ +static inline void esp_print_seqreg(unchar stepreg) +{ + stepreg &= ESP_STEP_VBITS; + printk("STEP<%s>", + (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : + (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : + (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : + (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : + (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : + "UNKNOWN")))))); +} + +static char *phase_string(int phase) +{ + switch(phase) { + case not_issued: + return "UNISSUED"; + case in_slct_norm: + return "SLCTNORM"; + case in_slct_stop: + return "SLCTSTOP"; + case in_slct_msg: + return "SLCTMSG"; + case in_slct_tag: + return "SLCTTAG"; + case in_slct_sneg: + return "SLCTSNEG"; + case in_datain: + return "DATAIN"; + case in_dataout: + return "DATAOUT"; + case in_data_done: + return "DATADONE"; + case in_msgin: + return "MSGIN"; + case in_msgincont: + return "MSGINCONT"; + case in_msgindone: + return "MSGINDONE"; + case in_msgout: + return "MSGOUT"; + case in_msgoutdone: + return "MSGOUTDONE"; + case in_cmdbegin: + return "CMDBEGIN"; + case in_cmdend: + return "CMDEND"; + case in_status: + return "STATUS"; + case in_freeing: + return "FREEING"; + case in_the_dark: + return "CLUELESS"; + case in_abortone: + return "ABORTONE"; + case in_abortall: + return "ABORTALL"; + case in_resetdev: + return "RESETDEV"; + case in_resetbus: + return "RESETBUS"; + case in_tgterror: + return "TGTERROR"; + default: + return "UNKNOWN"; + }; +} + +#ifdef DEBUG_STATE_MACHINE +static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase) +{ + ESPLOG(("<%s>", phase_string(newphase))); + s->SCp.sent_command = s->SCp.phase; + s->SCp.phase = newphase; +} +#else +#define esp_advance_phase(__s, __newphase) \ + (__s)->SCp.sent_command = (__s)->SCp.phase; \ + (__s)->SCp.phase = (__newphase); +#endif + +#ifdef DEBUG_ESP_CMDS +static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs, + unchar cmd) +{ + esp->espcmdlog[esp->espcmdent] = cmd; + esp->espcmdent = (esp->espcmdent + 1) & 31; + esp_write(eregs->esp_cmnd, cmd); +} +#else +#define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd)) +#endif + +/* How we use the various Linux SCSI data structures for operation. + * + * struct scsi_cmnd: + * + * We keep track of the syncronous capabilities of a target + * in the device member, using sync_min_period and + * sync_max_offset. These are the values we directly write + * into the ESP registers while running a command. If offset + * is zero the ESP will use asynchronous transfers. + * If the borken flag is set we assume we shouldn't even bother + * trying to negotiate for synchronous transfer as this target + * is really stupid. If we notice the target is dropping the + * bus, and we have been allowing it to disconnect, we clear + * the disconnect flag. + */ + +/* Manipulation of the ESP command queues. Thanks to the aha152x driver + * and its author, Juergen E. Fischer, for the methods used here. + * Note that these are per-ESP queues, not global queues like + * the aha152x driver uses. + */ +static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) +{ + Scsi_Cmnd *end; + + new_SC->host_scribble = (unsigned char *) NULL; + if(!*SC) + *SC = new_SC; + else { + for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble) + ; + end->host_scribble = (unsigned char *) new_SC; + } +} + +static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) +{ + new_SC->host_scribble = (unsigned char *) *SC; + *SC = new_SC; +} + +static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC) +{ + Scsi_Cmnd *ptr; + + ptr = *SC; + if(ptr) + *SC = (Scsi_Cmnd *) (*SC)->host_scribble; + return ptr; +} + +static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun) +{ + Scsi_Cmnd *ptr, *prev; + + for(ptr = *SC, prev = NULL; + ptr && ((ptr->device->id != target) || (ptr->device->lun != lun)); + prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble) + ; + if(ptr) { + if(prev) + prev->host_scribble=ptr->host_scribble; + else + *SC=(Scsi_Cmnd *)ptr->host_scribble; + } + return ptr; +} + +/* Resetting various pieces of the ESP scsi driver chipset */ + +/* Reset the ESP chip, _not_ the SCSI bus. */ +static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + int family_code, version, i; + volatile int trash; + + /* Now reset the ESP chip */ + esp_cmd(esp, eregs, ESP_CMD_RC); + esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); + if(esp->erev == fast) + esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB); + esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); + + /* This is the only point at which it is reliable to read + * the ID-code for a fast ESP chip variant. + */ + esp->max_period = ((35 * esp->ccycle) / 1000); + if(esp->erev == fast) { + char *erev2string[] = { + "Emulex FAS236", + "Emulex FPESP100A", + "fast", + "QLogic FAS366", + "Emulex FAS216", + "Symbios Logic 53CF9x-2", + "unknown!" + }; + + version = esp_read(eregs->esp_uid); + family_code = (version & 0xf8) >> 3; + if(family_code == 0x02) { + if ((version & 7) == 2) + esp->erev = fas216; + else + esp->erev = fas236; + } else if(family_code == 0x0a) + esp->erev = fas366; /* Version is usually '5'. */ + else if(family_code == 0x00) { + if ((version & 7) == 2) + esp->erev = fas100a; /* NCR53C9X */ + else + esp->erev = espunknown; + } else if(family_code == 0x14) { + if ((version & 7) == 2) + esp->erev = fsc; + else + esp->erev = espunknown; + } else if(family_code == 0x00) { + if ((version & 7) == 2) + esp->erev = fas100a; /* NCR53C9X */ + else + esp->erev = espunknown; + } else + esp->erev = espunknown; + ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n", + esp->esp_id, erev2string[esp->erev - fas236], + family_code, (version & 7))); + + esp->min_period = ((4 * esp->ccycle) / 1000); + } else { + esp->min_period = ((5 * esp->ccycle) / 1000); + } + + /* Reload the configuration registers */ + esp_write(eregs->esp_cfact, esp->cfact); + esp->prev_stp = 0; + esp_write(eregs->esp_stp, 0); + esp->prev_soff = 0; + esp_write(eregs->esp_soff, 0); + esp_write(eregs->esp_timeo, esp->neg_defp); + esp->max_period = (esp->max_period + 3)>>2; + esp->min_period = (esp->min_period + 3)>>2; + + esp_write(eregs->esp_cfg1, esp->config1); + switch(esp->erev) { + case esp100: + /* nothing to do */ + break; + case esp100a: + esp_write(eregs->esp_cfg2, esp->config2); + break; + case esp236: + /* Slow 236 */ + esp_write(eregs->esp_cfg2, esp->config2); + esp->prev_cfg3 = esp->config3[0]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + break; + case fas366: + panic("esp: FAS366 support not present, please notify " + "jongk@cs.utwente.nl"); + break; + case fas216: + case fas236: + case fsc: + /* Fast ESP variants */ + esp_write(eregs->esp_cfg2, esp->config2); + for(i=0; i<8; i++) + esp->config3[i] |= ESP_CONFIG3_FCLK; + esp->prev_cfg3 = esp->config3[0]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + if(esp->diff) + esp->radelay = 0; + else + esp->radelay = 16; + /* Different timeout constant for these chips */ + esp->neg_defp = + FSC_NEG_DEFP(esp->cfreq, + (esp->cfact == ESP_CCF_F0 ? + ESP_CCF_F7 + 1 : esp->cfact)); + esp_write(eregs->esp_timeo, esp->neg_defp); + /* Enable Active Negotiation if possible */ + if((esp->erev == fsc) && !esp->diff) + esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN); + break; + case fas100a: + /* Fast 100a */ + esp_write(eregs->esp_cfg2, esp->config2); + for(i=0; i<8; i++) + esp->config3[i] |= ESP_CONFIG3_FCLOCK; + esp->prev_cfg3 = esp->config3[0]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + esp->radelay = 32; + break; + default: + panic("esp: what could it be... I wonder..."); + break; + }; + + /* Eat any bitrot in the chip */ + trash = esp_read(eregs->esp_intrpt); + udelay(100); +} + +/* This places the ESP into a known state at boot time. */ +void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + volatile unchar trash; + + /* Reset the DMA */ + if(esp->dma_reset) + esp->dma_reset(esp); + + /* Reset the ESP */ + esp_reset_esp(esp, eregs); + + /* Reset the SCSI bus, but tell ESP not to generate an irq */ + esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB)); + esp_cmd(esp, eregs, ESP_CMD_RS); + udelay(400); + esp_write(eregs->esp_cfg1, esp->config1); + + /* Eat any bitrot in the chip and we are done... */ + trash = esp_read(eregs->esp_intrpt); +} + +/* Allocate structure and insert basic data such as SCSI chip frequency + * data and a pointer to the device + */ +struct NCR_ESP* esp_allocate(Scsi_Host_Template *tpnt, void *esp_dev) +{ + struct NCR_ESP *esp, *elink; + struct Scsi_Host *esp_host; + + esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP)); + if(!esp_host) + panic("Cannot register ESP SCSI host"); + esp = (struct NCR_ESP *) esp_host->hostdata; + if(!esp) + panic("No esp in hostdata"); + esp->ehost = esp_host; + esp->edev = esp_dev; + esp->esp_id = nesps++; + + /* Set bitshift value (only used on Amiga with multiple ESPs) */ + esp->shift = 2; + + /* Put into the chain of esp chips detected */ + if(espchain) { + elink = espchain; + while(elink->next) elink = elink->next; + elink->next = esp; + } else { + espchain = esp; + } + esp->next = NULL; + + return esp; +} + +void esp_deallocate(struct NCR_ESP *esp) +{ + struct NCR_ESP *elink; + + if(espchain == esp) { + espchain = NULL; + } else { + for(elink = espchain; elink && (elink->next != esp); elink = elink->next); + if(elink) + elink->next = esp->next; + } + nesps--; +} + +/* Complete initialization of ESP structure and device + * Caller must have initialized appropriate parts of the ESP structure + * between the call to esp_allocate and this function. + */ +void esp_initialize(struct NCR_ESP *esp) +{ + struct ESP_regs *eregs = esp->eregs; + unsigned int fmhz; + unchar ccf; + int i; + + /* Check out the clock properties of the chip. */ + + /* This is getting messy but it has to be done + * correctly or else you get weird behavior all + * over the place. We are trying to basically + * figure out three pieces of information. + * + * a) Clock Conversion Factor + * + * This is a representation of the input + * crystal clock frequency going into the + * ESP on this machine. Any operation whose + * timing is longer than 400ns depends on this + * value being correct. For example, you'll + * get blips for arbitration/selection during + * high load or with multiple targets if this + * is not set correctly. + * + * b) Selection Time-Out + * + * The ESP isn't very bright and will arbitrate + * for the bus and try to select a target + * forever if you let it. This value tells + * the ESP when it has taken too long to + * negotiate and that it should interrupt + * the CPU so we can see what happened. + * The value is computed as follows (from + * NCR/Symbios chip docs). + * + * (Time Out Period) * (Input Clock) + * STO = ---------------------------------- + * (8192) * (Clock Conversion Factor) + * + * You usually want the time out period to be + * around 250ms, I think we'll set it a little + * bit higher to account for fully loaded SCSI + * bus's and slow devices that don't respond so + * quickly to selection attempts. (yeah, I know + * this is out of spec. but there is a lot of + * buggy pieces of firmware out there so bite me) + * + * c) Imperical constants for synchronous offset + * and transfer period register values + * + * This entails the smallest and largest sync + * period we could ever handle on this ESP. + */ + + fmhz = esp->cfreq; + + if(fmhz <= (5000000)) + ccf = 0; + else + ccf = (((5000000 - 1) + (fmhz))/(5000000)); + if(!ccf || ccf > 8) { + /* If we can't find anything reasonable, + * just assume 20MHZ. This is the clock + * frequency of the older sun4c's where I've + * been unable to find the clock-frequency + * PROM property. All other machines provide + * useful values it seems. + */ + ccf = ESP_CCF_F4; + fmhz = (20000000); + } + if(ccf==(ESP_CCF_F7+1)) + esp->cfact = ESP_CCF_F0; + else if(ccf == ESP_CCF_NEVER) + esp->cfact = ESP_CCF_F2; + else + esp->cfact = ccf; + esp->cfreq = fmhz; + esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); + esp->ctick = ESP_TICK(ccf, esp->ccycle); + esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); + esp->sync_defp = SYNC_DEFP_SLOW; + + printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ", + esp->scsi_id, (esp->cfreq / 1000000), + ccf, (int) esp->neg_defp); + + /* Fill in ehost data */ + esp->ehost->base = (unsigned long)eregs; + esp->ehost->this_id = esp->scsi_id; + esp->ehost->irq = esp->irq; + + /* SCSI id mask */ + esp->scsi_id_mask = (1 << esp->scsi_id); + + /* Probe the revision of this esp */ + esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); + esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); + esp_write(eregs->esp_cfg2, esp->config2); + if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) != + (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { + printk("NCR53C90(esp100)\n"); + esp->erev = esp100; + } else { + esp->config2 = 0; + esp_write(eregs->esp_cfg2, 0); + esp_write(eregs->esp_cfg3, 5); + if(esp_read(eregs->esp_cfg3) != 5) { + printk("NCR53C90A(esp100a)\n"); + esp->erev = esp100a; + } else { + int target; + + for(target=0; target<8; target++) + esp->config3[target] = 0; + esp->prev_cfg3 = 0; + esp_write(eregs->esp_cfg3, 0); + if(ccf > ESP_CCF_F5) { + printk("NCR53C9XF(espfast)\n"); + esp->erev = fast; + esp->sync_defp = SYNC_DEFP_FAST; + } else { + printk("NCR53C9x(esp236)\n"); + esp->erev = esp236; + } + } + } + + /* Initialize the command queues */ + esp->current_SC = NULL; + esp->disconnected_SC = NULL; + esp->issue_SC = NULL; + + /* Clear the state machines. */ + esp->targets_present = 0; + esp->resetting_bus = 0; + esp->snip = 0; + + init_waitqueue_head(&esp->reset_queue); + + esp->fas_premature_intr_workaround = 0; + for(i = 0; i < 32; i++) + esp->espcmdlog[i] = 0; + esp->espcmdent = 0; + for(i = 0; i < 16; i++) { + esp->cur_msgout[i] = 0; + esp->cur_msgin[i] = 0; + } + esp->prevmsgout = esp->prevmsgin = 0; + esp->msgout_len = esp->msgin_len = 0; + + /* Clear the one behind caches to hold unmatchable values. */ + esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff; + + /* Reset the thing before we try anything... */ + esp_bootup_reset(esp, eregs); + + esps_in_use++; +} + +/* The info function will return whatever useful + * information the developer sees fit. If not provided, then + * the name field will be used instead. + */ +const char *esp_info(struct Scsi_Host *host) +{ + struct NCR_ESP *esp; + + esp = (struct NCR_ESP *) host->hostdata; + switch(esp->erev) { + case esp100: + return "ESP100 (NCR53C90)"; + case esp100a: + return "ESP100A (NCR53C90A)"; + case esp236: + return "ESP236 (NCR53C9x)"; + case fas216: + return "Emulex FAS216"; + case fas236: + return "Emulex FAS236"; + case fas366: + return "QLogic FAS366"; + case fas100a: + return "FPESP100A"; + case fsc: + return "Symbios Logic 53CF9x-2"; + default: + panic("Bogon ESP revision"); + }; +} + +/* From Wolfgang Stanglmeier's NCR scsi driver. */ +struct info_str +{ + char *buffer; + int length; + int offset; + int pos; +}; + +static void copy_mem_info(struct info_str *info, char *data, int len) +{ + if (info->pos + len > info->length) + len = info->length - info->pos; + + if (info->pos + len < info->offset) { + info->pos += len; + return; + } + if (info->pos < info->offset) { + data += (info->offset - info->pos); + len -= (info->offset - info->pos); + } + + if (len > 0) { + memcpy(info->buffer + info->pos, data, len); + info->pos += len; + } +} + +static int copy_info(struct info_str *info, char *fmt, ...) +{ + va_list args; + char buf[81]; + int len; + + va_start(args, fmt); + len = vsprintf(buf, fmt, args); + va_end(args); + + copy_mem_info(info, buf, len); + return len; +} + +static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len) +{ + struct scsi_device *sdev; + struct info_str info; + int i; + + info.buffer = ptr; + info.length = len; + info.offset = offset; + info.pos = 0; + + copy_info(&info, "ESP Host Adapter:\n"); + copy_info(&info, "\tESP Model\t\t"); + switch(esp->erev) { + case esp100: + copy_info(&info, "ESP100 (NCR53C90)\n"); + break; + case esp100a: + copy_info(&info, "ESP100A (NCR53C90A)\n"); + break; + case esp236: + copy_info(&info, "ESP236 (NCR53C9x)\n"); + break; + case fas216: + copy_info(&info, "Emulex FAS216\n"); + break; + case fas236: + copy_info(&info, "Emulex FAS236\n"); + break; + case fas100a: + copy_info(&info, "FPESP100A\n"); + break; + case fast: + copy_info(&info, "Generic FAST\n"); + break; + case fas366: + copy_info(&info, "QLogic FAS366\n"); + break; + case fsc: + copy_info(&info, "Symbios Logic 53C9x-2\n"); + break; + case espunknown: + default: + copy_info(&info, "Unknown!\n"); + break; + }; + copy_info(&info, "\tLive Targets\t\t[ "); + for(i = 0; i < 15; i++) { + if(esp->targets_present & (1 << i)) + copy_info(&info, "%d ", i); + } + copy_info(&info, "]\n\n"); + + /* Now describe the state of each existing target. */ + copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n"); + + shost_for_each_device(sdev, esp->ehost) { + struct esp_device *esp_dev = sdev->hostdata; + uint id = sdev->id; + + if (!(esp->targets_present & (1 << id))) + continue; + + copy_info(&info, "%d\t\t", id); + copy_info(&info, "%08lx\t", esp->config3[id]); + copy_info(&info, "[%02lx,%02lx]\t\t\t", + esp_dev->sync_max_offset, + esp_dev->sync_min_period); + copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no"); + } + + return info.pos > info.offset? info.pos - info.offset : 0; +} + +/* ESP proc filesystem code. */ +int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length, + int inout) +{ + struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata; + + if(inout) + return -EINVAL; /* not yet */ + if(start) + *start = buffer; + return esp_host_info(esp, buffer, offset, length); +} + +static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + if(sp->use_sg == 0) { + sp->SCp.this_residual = sp->request_bufflen; + sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; + sp->SCp.buffers_residual = 0; + if (esp->dma_mmu_get_scsi_one) + esp->dma_mmu_get_scsi_one(esp, sp); + else + sp->SCp.ptr = + (char *) virt_to_phys(sp->request_buffer); + } else { + sp->SCp.buffer = (struct scatterlist *) sp->buffer; + sp->SCp.buffers_residual = sp->use_sg - 1; + sp->SCp.this_residual = sp->SCp.buffer->length; + if (esp->dma_mmu_get_scsi_sgl) + esp->dma_mmu_get_scsi_sgl(esp, sp); + else + sp->SCp.ptr = + (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); + } +} + +static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + if(sp->use_sg == 0) { + if (esp->dma_mmu_release_scsi_one) + esp->dma_mmu_release_scsi_one(esp, sp); + } else { + if (esp->dma_mmu_release_scsi_sgl) + esp->dma_mmu_release_scsi_sgl(esp, sp); + } +} + +static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; + + sp->SCp.ptr = ep->saved_ptr; + sp->SCp.buffer = ep->saved_buffer; + sp->SCp.this_residual = ep->saved_this_residual; + sp->SCp.buffers_residual = ep->saved_buffers_residual; +} + +static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + struct esp_pointers *ep = &esp->data_pointers[sp->device->id]; + + ep->saved_ptr = sp->SCp.ptr; + ep->saved_buffer = sp->SCp.buffer; + ep->saved_this_residual = sp->SCp.this_residual; + ep->saved_buffers_residual = sp->SCp.buffers_residual; +} + +/* Some rules: + * + * 1) Never ever panic while something is live on the bus. + * If there is to be any chance of syncing the disks this + * rule is to be obeyed. + * + * 2) Any target that causes a foul condition will no longer + * have synchronous transfers done to it, no questions + * asked. + * + * 3) Keep register accesses to a minimum. Think about some + * day when we have Xbus machines this is running on and + * the ESP chip is on the other end of the machine on a + * different board from the cpu where this is running. + */ + +/* Fire off a command. We assume the bus is free and that the only + * case where we could see an interrupt is where we have disconnected + * commands active and they are trying to reselect us. + */ +static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + switch(sp->cmd_len) { + case 6: + case 10: + case 12: + esp->esp_slowcmd = 0; + break; + + default: + esp->esp_slowcmd = 1; + esp->esp_scmdleft = sp->cmd_len; + esp->esp_scmdp = &sp->cmnd[0]; + break; + }; +} + +static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset) +{ + esp->cur_msgout[0] = EXTENDED_MESSAGE; + esp->cur_msgout[1] = 3; + esp->cur_msgout[2] = EXTENDED_SDTR; + esp->cur_msgout[3] = period; + esp->cur_msgout[4] = offset; + esp->msgout_len = 5; +} + +static void esp_exec_cmd(struct NCR_ESP *esp) +{ + struct ESP_regs *eregs = esp->eregs; + struct esp_device *esp_dev; + Scsi_Cmnd *SCptr; + Scsi_Device *SDptr; + volatile unchar *cmdp = esp->esp_command; + unsigned char the_esp_command; + int lun, target; + int i; + + /* Hold off if we have disconnected commands and + * an IRQ is showing... + */ + if(esp->disconnected_SC && esp->dma_irq_p(esp)) + return; + + /* Grab first member of the issue queue. */ + SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); + + /* Safe to panic here because current_SC is null. */ + if(!SCptr) + panic("esp: esp_exec_cmd and issue queue is NULL"); + + SDptr = SCptr->device; + esp_dev = SDptr->hostdata; + lun = SCptr->device->lun; + target = SCptr->device->id; + + esp->snip = 0; + esp->msgout_len = 0; + + /* Send it out whole, or piece by piece? The ESP + * only knows how to automatically send out 6, 10, + * and 12 byte commands. I used to think that the + * Linux SCSI code would never throw anything other + * than that to us, but then again there is the + * SCSI generic driver which can send us anything. + */ + esp_check_cmd(esp, SCptr); + + /* If arbitration/selection is successful, the ESP will leave + * ATN asserted, causing the target to go into message out + * phase. The ESP will feed the target the identify and then + * the target can only legally go to one of command, + * datain/out, status, or message in phase, or stay in message + * out phase (should we be trying to send a sync negotiation + * message after the identify). It is not allowed to drop + * BSY, but some buggy targets do and we check for this + * condition in the selection complete code. Most of the time + * we'll make the command bytes available to the ESP and it + * will not interrupt us until it finishes command phase, we + * cannot do this for command sizes the ESP does not + * understand and in this case we'll get interrupted right + * when the target goes into command phase. + * + * It is absolutely _illegal_ in the presence of SCSI-2 devices + * to use the ESP select w/o ATN command. When SCSI-2 devices are + * present on the bus we _must_ always go straight to message out + * phase with an identify message for the target. Being that + * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 + * selections should not confuse SCSI-1 we hope. + */ + + if(esp_dev->sync) { + /* this targets sync is known */ +#ifdef CONFIG_SCSI_MAC_ESP +do_sync_known: +#endif + if(esp_dev->disconnect) + *cmdp++ = IDENTIFY(1, lun); + else + *cmdp++ = IDENTIFY(0, lun); + + if(esp->esp_slowcmd) { + the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); + esp_advance_phase(SCptr, in_slct_stop); + } else { + the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); + esp_advance_phase(SCptr, in_slct_norm); + } + } else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) { + /* After the bootup SCSI code sends both the + * TEST_UNIT_READY and INQUIRY commands we want + * to at least attempt allowing the device to + * disconnect. + */ + ESPMISC(("esp: Selecting device for first time. target=%d " + "lun=%d\n", target, SCptr->device->lun)); + if(!SDptr->borken && !esp_dev->disconnect) + esp_dev->disconnect = 1; + + *cmdp++ = IDENTIFY(0, lun); + esp->prevmsgout = NOP; + esp_advance_phase(SCptr, in_slct_norm); + the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); + + /* Take no chances... */ + esp_dev->sync_max_offset = 0; + esp_dev->sync_min_period = 0; + } else { + int toshiba_cdrom_hwbug_wkaround = 0; + +#ifdef CONFIG_SCSI_MAC_ESP + /* Never allow synchronous transfers (disconnect OK) on + * Macintosh. Well, maybe later when we figured out how to + * do DMA on the machines that support it ... + */ + esp_dev->disconnect = 1; + esp_dev->sync_max_offset = 0; + esp_dev->sync_min_period = 0; + esp_dev->sync = 1; + esp->snip = 0; + goto do_sync_known; +#endif + /* We've talked to this guy before, + * but never negotiated. Let's try + * sync negotiation. + */ + if(!SDptr->borken) { + if((SDptr->type == TYPE_ROM) && + (!strncmp(SDptr->vendor, "TOSHIBA", 7))) { + /* Nice try sucker... */ + ESPMISC(("esp%d: Disabling sync for buggy " + "Toshiba CDROM.\n", esp->esp_id)); + toshiba_cdrom_hwbug_wkaround = 1; + build_sync_nego_msg(esp, 0, 0); + } else { + build_sync_nego_msg(esp, esp->sync_defp, 15); + } + } else { + build_sync_nego_msg(esp, 0, 0); + } + esp_dev->sync = 1; + esp->snip = 1; + + /* A fix for broken SCSI1 targets, when they disconnect + * they lock up the bus and confuse ESP. So disallow + * disconnects for SCSI1 targets for now until we + * find a better fix. + * + * Addendum: This is funny, I figured out what was going + * on. The blotzed SCSI1 target would disconnect, + * one of the other SCSI2 targets or both would be + * disconnected as well. The SCSI1 target would + * stay disconnected long enough that we start + * up a command on one of the SCSI2 targets. As + * the ESP is arbitrating for the bus the SCSI1 + * target begins to arbitrate as well to reselect + * the ESP. The SCSI1 target refuses to drop it's + * ID bit on the data bus even though the ESP is + * at ID 7 and is the obvious winner for any + * arbitration. The ESP is a poor sport and refuses + * to lose arbitration, it will continue indefinitely + * trying to arbitrate for the bus and can only be + * stopped via a chip reset or SCSI bus reset. + * Therefore _no_ disconnects for SCSI1 targets + * thank you very much. ;-) + */ + if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) || + toshiba_cdrom_hwbug_wkaround || SDptr->borken) { + ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d " + "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); + esp_dev->disconnect = 0; + *cmdp++ = IDENTIFY(0, lun); + } else { + *cmdp++ = IDENTIFY(1, lun); + } + + /* ESP fifo is only so big... + * Make this look like a slow command. + */ + esp->esp_slowcmd = 1; + esp->esp_scmdleft = SCptr->cmd_len; + esp->esp_scmdp = &SCptr->cmnd[0]; + + the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); + esp_advance_phase(SCptr, in_slct_msg); + } + + if(!esp->esp_slowcmd) + for(i = 0; i < SCptr->cmd_len; i++) + *cmdp++ = SCptr->cmnd[i]; + + esp_write(eregs->esp_busid, (target & 7)); + if (esp->prev_soff != esp_dev->sync_max_offset || + esp->prev_stp != esp_dev->sync_min_period || + (esp->erev > esp100a && + esp->prev_cfg3 != esp->config3[target])) { + esp->prev_soff = esp_dev->sync_max_offset; + esp_write(eregs->esp_soff, esp->prev_soff); + esp->prev_stp = esp_dev->sync_min_period; + esp_write(eregs->esp_stp, esp->prev_stp); + if(esp->erev > esp100a) { + esp->prev_cfg3 = esp->config3[target]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + } + } + i = (cmdp - esp->esp_command); + + /* Set up the DMA and ESP counters */ + if(esp->do_pio_cmds){ + int j = 0; + + /* + * XXX MSch: + * + * It seems this is required, at least to clean up + * after failed commands when using PIO mode ... + */ + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + + for(;j<i;j++) + esp_write(eregs->esp_fdata, esp->esp_command[j]); + the_esp_command &= ~ESP_CMD_DMA; + + /* Tell ESP to "go". */ + esp_cmd(esp, eregs, the_esp_command); + } else { + /* Set up the ESP counters */ + esp_write(eregs->esp_tclow, i); + esp_write(eregs->esp_tcmed, 0); + esp->dma_init_write(esp, esp->esp_command_dvma, i); + + /* Tell ESP to "go". */ + esp_cmd(esp, eregs, the_esp_command); + } +} + +/* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ +int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) +{ + struct NCR_ESP *esp; + + /* Set up func ptr and initial driver cmd-phase. */ + SCpnt->scsi_done = done; + SCpnt->SCp.phase = not_issued; + + esp = (struct NCR_ESP *) SCpnt->device->host->hostdata; + + if(esp->dma_led_on) + esp->dma_led_on(esp); + + /* We use the scratch area. */ + ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun)); + ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun)); + + esp_get_dmabufs(esp, SCpnt); + esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */ + + SCpnt->SCp.Status = CHECK_CONDITION; + SCpnt->SCp.Message = 0xff; + SCpnt->SCp.sent_command = 0; + + /* Place into our queue. */ + if(SCpnt->cmnd[0] == REQUEST_SENSE) { + ESPQUEUE(("RQSENSE\n")); + prepend_SC(&esp->issue_SC, SCpnt); + } else { + ESPQUEUE(("\n")); + append_SC(&esp->issue_SC, SCpnt); + } + + /* Run it now if we can. */ + if(!esp->current_SC && !esp->resetting_bus) + esp_exec_cmd(esp); + + return 0; +} + +/* Dump driver state. */ +static void esp_dump_cmd(Scsi_Cmnd *SCptr) +{ + ESPLOG(("[tgt<%02x> lun<%02x> " + "pphase<%s> cphase<%s>]", + SCptr->device->id, SCptr->device->lun, + phase_string(SCptr->SCp.sent_command), + phase_string(SCptr->SCp.phase))); +} + +static void esp_dump_state(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; +#ifdef DEBUG_ESP_CMDS + int i; +#endif + + ESPLOG(("esp%d: dumping state\n", esp->esp_id)); + + /* Print DMA status */ + esp->dma_dump_state(esp); + + ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", + esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); + ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", + esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep), + esp_read(eregs->esp_intrpt))); +#ifdef DEBUG_ESP_CMDS + printk("esp%d: last ESP cmds [", esp->esp_id); + i = (esp->espcmdent - 1) & 31; + printk("<"); + esp_print_cmd(esp->espcmdlog[i]); + printk(">"); + i = (i - 1) & 31; + printk("<"); + esp_print_cmd(esp->espcmdlog[i]); + printk(">"); + i = (i - 1) & 31; + printk("<"); + esp_print_cmd(esp->espcmdlog[i]); + printk(">"); + i = (i - 1) & 31; + printk("<"); + esp_print_cmd(esp->espcmdlog[i]); + printk(">"); + printk("]\n"); +#endif /* (DEBUG_ESP_CMDS) */ + + if(SCptr) { + ESPLOG(("esp%d: current command ", esp->esp_id)); + esp_dump_cmd(SCptr); + } + ESPLOG(("\n")); + SCptr = esp->disconnected_SC; + ESPLOG(("esp%d: disconnected ", esp->esp_id)); + while(SCptr) { + esp_dump_cmd(SCptr); + SCptr = (Scsi_Cmnd *) SCptr->host_scribble; + } + ESPLOG(("\n")); +} + +/* Abort a command. The host_lock is acquired by caller. */ +int esp_abort(Scsi_Cmnd *SCptr) +{ + struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; + struct ESP_regs *eregs = esp->eregs; + int don; + + ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); + esp_dump_state(esp, eregs); + + /* Wheee, if this is the current command on the bus, the + * best we can do is assert ATN and wait for msgout phase. + * This should even fix a hung SCSI bus when we lose state + * in the driver and timeout because the eventual phase change + * will cause the ESP to (eventually) give an interrupt. + */ + if(esp->current_SC == SCptr) { + esp->cur_msgout[0] = ABORT; + esp->msgout_len = 1; + esp->msgout_ctr = 0; + esp_cmd(esp, eregs, ESP_CMD_SATN); + return SUCCESS; + } + + /* If it is still in the issue queue then we can safely + * call the completion routine and report abort success. + */ + don = esp->dma_ports_p(esp); + if(don) { + esp->dma_ints_off(esp); + synchronize_irq(esp->irq); + } + if(esp->issue_SC) { + Scsi_Cmnd **prev, *this; + for(prev = (&esp->issue_SC), this = esp->issue_SC; + this; + prev = (Scsi_Cmnd **) &(this->host_scribble), + this = (Scsi_Cmnd *) this->host_scribble) { + if(this == SCptr) { + *prev = (Scsi_Cmnd *) this->host_scribble; + this->host_scribble = NULL; + esp_release_dmabufs(esp, this); + this->result = DID_ABORT << 16; + this->done(this); + if(don) + esp->dma_ints_on(esp); + return SUCCESS; + } + } + } + + /* Yuck, the command to abort is disconnected, it is not + * worth trying to abort it now if something else is live + * on the bus at this time. So, we let the SCSI code wait + * a little bit and try again later. + */ + if(esp->current_SC) { + if(don) + esp->dma_ints_on(esp); + return FAILED; + } + + /* It's disconnected, we have to reconnect to re-establish + * the nexus and tell the device to abort. However, we really + * cannot 'reconnect' per se. Don't try to be fancy, just + * indicate failure, which causes our caller to reset the whole + * bus. + */ + + if(don) + esp->dma_ints_on(esp); + return FAILED; +} + +/* We've sent ESP_CMD_RS to the ESP, the interrupt had just + * arrived indicating the end of the SCSI bus reset. Our job + * is to clean out the command queues and begin re-execution + * of SCSI commands once more. + */ +static int esp_finish_reset(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + Scsi_Cmnd *sp = esp->current_SC; + + /* Clean up currently executing command, if any. */ + if (sp != NULL) { + esp_release_dmabufs(esp, sp); + sp->result = (DID_RESET << 16); + sp->scsi_done(sp); + esp->current_SC = NULL; + } + + /* Clean up disconnected queue, they have been invalidated + * by the bus reset. + */ + if (esp->disconnected_SC) { + while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) { + esp_release_dmabufs(esp, sp); + sp->result = (DID_RESET << 16); + sp->scsi_done(sp); + } + } + + /* SCSI bus reset is complete. */ + esp->resetting_bus = 0; + wake_up(&esp->reset_queue); + + /* Ok, now it is safe to get commands going once more. */ + if(esp->issue_SC) + esp_exec_cmd(esp); + + return do_intr_end; +} + +static int esp_do_resetbus(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); + esp->resetting_bus = 1; + esp_cmd(esp, eregs, ESP_CMD_RS); + + return do_intr_end; +} + +/* Reset ESP chip, reset hanging bus, then kill active and + * disconnected commands for targets without soft reset. + * + * The host_lock is acquired by caller. + */ +int esp_reset(Scsi_Cmnd *SCptr) +{ + struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; + + (void) esp_do_resetbus(esp, esp->eregs); + + spin_unlock_irq(esp->ehost->host_lock); + + wait_event(esp->reset_queue, (esp->resetting_bus == 0)); + + spin_lock_irq(esp->ehost->host_lock); + + return SUCCESS; +} + +/* Internal ESP done function. */ +static void esp_done(struct NCR_ESP *esp, int error) +{ + Scsi_Cmnd *done_SC; + + if(esp->current_SC) { + done_SC = esp->current_SC; + esp->current_SC = NULL; + esp_release_dmabufs(esp, done_SC); + done_SC->result = error; + done_SC->scsi_done(done_SC); + + /* Bus is free, issue any commands in the queue. */ + if(esp->issue_SC && !esp->current_SC) + esp_exec_cmd(esp); + } else { + /* Panic is safe as current_SC is null so we may still + * be able to accept more commands to sync disk buffers. + */ + ESPLOG(("panicing\n")); + panic("esp: done() called with NULL esp->current_SC"); + } +} + +/* Wheee, ESP interrupt engine. */ + +/* Forward declarations. */ +static int esp_do_phase_determine(struct NCR_ESP *esp, + struct ESP_regs *eregs); +static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs); +static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs); + +#define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP) +#define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP) + +/* We try to avoid some interrupts by jumping ahead and see if the ESP + * has gotten far enough yet. Hence the following. + */ +static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs, + Scsi_Cmnd *scp, int prev_phase, int new_phase) +{ + if(scp->SCp.sent_command != prev_phase) + return 0; + + if(esp->dma_irq_p(esp)) { + /* Yes, we are able to save an interrupt. */ + esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); + esp->ireg = esp_read(eregs->esp_intrpt); + if(!(esp->ireg & ESP_INTR_SR)) + return 0; + else + return do_reset_complete; + } + /* Ho hum, target is taking forever... */ + scp->SCp.sent_command = new_phase; /* so we don't recurse... */ + return do_intr_end; +} + +static inline int skipahead2(struct NCR_ESP *esp, + struct ESP_regs *eregs, + Scsi_Cmnd *scp, int prev_phase1, int prev_phase2, + int new_phase) +{ + if(scp->SCp.sent_command != prev_phase1 && + scp->SCp.sent_command != prev_phase2) + return 0; + if(esp->dma_irq_p(esp)) { + /* Yes, we are able to save an interrupt. */ + esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); + esp->ireg = esp_read(eregs->esp_intrpt); + if(!(esp->ireg & ESP_INTR_SR)) + return 0; + else + return do_reset_complete; + } + /* Ho hum, target is taking forever... */ + scp->SCp.sent_command = new_phase; /* so we don't recurse... */ + return do_intr_end; +} + +/* Misc. esp helper macros. */ +#define esp_setcount(__eregs, __cnt) \ + esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \ + esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff)) + +#define esp_getcount(__eregs) \ + ((esp_read((__eregs)->esp_tclow)&0xff) | \ + ((esp_read((__eregs)->esp_tcmed)&0xff) << 8)) + +#define fcount(__esp, __eregs) \ + (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES) + +#define fnzero(__esp, __eregs) \ + (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO) + +/* XXX speculative nops unnecessary when continuing amidst a data phase + * XXX even on esp100!!! another case of flooding the bus with I/O reg + * XXX writes... + */ +#define esp_maybe_nop(__esp, __eregs) \ + if((__esp)->erev == esp100) \ + esp_cmd((__esp), (__eregs), ESP_CMD_NULL) + +#define sreg_to_dataphase(__sreg) \ + ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain) + +/* The ESP100 when in synchronous data phase, can mistake a long final + * REQ pulse from the target as an extra byte, it places whatever is on + * the data lines into the fifo. For now, we will assume when this + * happens that the target is a bit quirky and we don't want to + * be talking synchronously to it anyways. Regardless, we need to + * tell the ESP to eat the extraneous byte so that we can proceed + * to the next phase. + */ +static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs, + Scsi_Cmnd *sp, int fifocnt) +{ + /* Do not touch this piece of code. */ + if((!(esp->erev == esp100)) || + (!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) && + !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) { + if(sp->SCp.phase == in_dataout) + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + return 0; + } else { + /* Async mode for this guy. */ + build_sync_nego_msg(esp, 0, 0); + + /* Ack the bogus byte, but set ATN first. */ + esp_cmd(esp, eregs, ESP_CMD_SATN); + esp_cmd(esp, eregs, ESP_CMD_MOK); + return 1; + } +} + +/* This closes the window during a selection with a reselect pending, because + * we use DMA for the selection process the FIFO should hold the correct + * contents if we get reselected during this process. So we just need to + * ack the possible illegal cmd interrupt pending on the esp100. + */ +static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + volatile unchar junk; + + if(esp->erev != esp100) + return 0; + junk = esp_read(eregs->esp_intrpt); + + if(junk & ESP_INTR_SR) + return 1; + return 0; +} + +/* This verifies the BUSID bits during a reselection so that we know which + * target is talking to us. + */ +static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + int it, me = esp->scsi_id_mask, targ = 0; + + if(2 != fcount(esp, eregs)) + return -1; + it = esp_read(eregs->esp_fdata); + if(!(it & me)) + return -1; + it &= ~me; + if(it & (it - 1)) + return -1; + while(!(it & 1)) + targ++, it >>= 1; + return targ; +} + +/* This verifies the identify from the target so that we know which lun is + * being reconnected. + */ +static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + int lun; + + if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) + return -1; + lun = esp_read(eregs->esp_fdata); + + /* Yes, you read this correctly. We report lun of zero + * if we see parity error. ESP reports parity error for + * the lun byte, and this is the only way to hope to recover + * because the target is connected. + */ + if(esp->sreg & ESP_STAT_PERR) + return 0; + + /* Check for illegal bits being set in the lun. */ + if((lun & 0x40) || !(lun & 0x80)) + return -1; + + return lun & 7; +} + +/* This puts the driver in a state where it can revitalize a command that + * is being continued due to reselection. + */ +static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs, + Scsi_Cmnd *sp) +{ + Scsi_Device *dp = sp->device; + struct esp_device *esp_dev = dp->hostdata; + + if(esp->prev_soff != esp_dev->sync_max_offset || + esp->prev_stp != esp_dev->sync_min_period || + (esp->erev > esp100a && + esp->prev_cfg3 != esp->config3[sp->device->id])) { + esp->prev_soff = esp_dev->sync_max_offset; + esp_write(eregs->esp_soff, esp->prev_soff); + esp->prev_stp = esp_dev->sync_min_period; + esp_write(eregs->esp_stp, esp->prev_stp); + if(esp->erev > esp100a) { + esp->prev_cfg3 = esp->config3[sp->device->id]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + } + } + esp->current_SC = sp; +} + +/* This will place the current working command back into the issue queue + * if we are to receive a reselection amidst a selection attempt. + */ +static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + if(!esp->disconnected_SC) + ESPLOG(("esp%d: Weird, being reselected but disconnected " + "command queue is empty.\n", esp->esp_id)); + esp->snip = 0; + esp->current_SC = NULL; + sp->SCp.phase = not_issued; + append_SC(&esp->issue_SC, sp); +} + +/* Begin message in phase. */ +static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + esp_maybe_nop(esp, eregs); + esp_cmd(esp, eregs, ESP_CMD_TI); + esp->msgin_len = 1; + esp->msgin_ctr = 0; + esp_advance_phase(esp->current_SC, in_msgindone); + return do_work_bus; +} + +static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp) +{ + ++sp->SCp.buffer; + --sp->SCp.buffers_residual; + sp->SCp.this_residual = sp->SCp.buffer->length; + if (esp->dma_advance_sg) + esp->dma_advance_sg (sp); + else + sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); + +} + +/* Please note that the way I've coded these routines is that I _always_ + * check for a disconnect during any and all information transfer + * phases. The SCSI standard states that the target _can_ cause a BUS + * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note + * that during information transfer phases the target controls every + * change in phase, the only thing the initiator can do is "ask" for + * a message out phase by driving ATN true. The target can, and sometimes + * will, completely ignore this request so we cannot assume anything when + * we try to force a message out phase to abort/reset a target. Most of + * the time the target will eventually be nice and go to message out, so + * we may have to hold on to our state about what we want to tell the target + * for some period of time. + */ + +/* I think I have things working here correctly. Even partial transfers + * within a buffer or sub-buffer should not upset us at all no matter + * how bad the target and/or ESP fucks things up. + */ +static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + int thisphase, hmuch; + + ESPDATA(("esp_do_data: ")); + esp_maybe_nop(esp, eregs); + thisphase = sreg_to_dataphase(esp->sreg); + esp_advance_phase(SCptr, thisphase); + ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); + hmuch = esp->dma_can_transfer(esp, SCptr); + + /* + * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0 + */ + if (hmuch) { /* DMA */ + /* + * DMA + */ + ESPDATA(("hmuch<%d> ", hmuch)); + esp->current_transfer_size = hmuch; + esp_setcount(eregs, (esp->fas_premature_intr_workaround ? + (hmuch + 0x40) : hmuch)); + esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr), + hmuch, (thisphase == in_datain)); + ESPDATA(("DMA|TI --> do_intr_end\n")); + esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); + return do_intr_end; + /* + * end DMA + */ + } else { + /* + * PIO + */ + int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */ + int fifocnt = 0; + + oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK; + + /* + * polled transfer; ugly, can we make this happen in a DRQ + * interrupt handler ?? + * requires keeping track of state information in host or + * command struct! + * Problem: I've never seen a DRQ happen on Mac, not even + * with ESP_CMD_DMA ... + */ + + /* figure out how much needs to be transferred */ + hmuch = SCptr->SCp.this_residual; + ESPDATA(("hmuch<%d> pio ", hmuch)); + esp->current_transfer_size = hmuch; + + /* tell the ESP ... */ + esp_setcount(eregs, hmuch); + + /* loop */ + while (hmuch) { + int j, fifo_stuck = 0, newphase; + unsigned long flags, timeout; +#if 0 + if ( i % 10 ) + ESPDATA(("\r")); + else + ESPDATA(( /*"\n"*/ "\r")); +#endif +#if 0 + local_irq_save(flags); +#endif + if(thisphase == in_datain) { + /* 'go' ... */ + esp_cmd(esp, eregs, ESP_CMD_TI); + + /* wait for data */ + timeout = 1000000; + while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) + udelay(2); + if (timeout == 0) + printk("DRQ datain timeout! \n"); + + newphase = esp->sreg & ESP_STAT_PMASK; + + /* see how much we got ... */ + fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); + + if (!fifocnt) + fifo_stuck++; + else + fifo_stuck = 0; + + ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase)); + + /* read fifo */ + for(j=0;j<fifocnt;j++) + SCptr->SCp.ptr[i++] = esp_read(eregs->esp_fdata); + + ESPDATA(("(%d) ", i)); + + /* how many to go ?? */ + hmuch -= fifocnt; + + /* break if status phase !! */ + if(newphase == ESP_STATP) { + /* clear int. */ + esp->ireg = esp_read(eregs->esp_intrpt); + break; + } + } else { +#define MAX_FIFO 8 + /* how much will fit ? */ + int this_count = MAX_FIFO - fifocnt; + if (this_count > hmuch) + this_count = hmuch; + + /* fill fifo */ + for(j=0;j<this_count;j++) + esp_write(eregs->esp_fdata, SCptr->SCp.ptr[i++]); + + /* how many left if this goes out ?? */ + hmuch -= this_count; + + /* 'go' ... */ + esp_cmd(esp, eregs, ESP_CMD_TI); + + /* wait for 'got it' */ + timeout = 1000000; + while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) + udelay(2); + if (timeout == 0) + printk("DRQ dataout timeout! \n"); + + newphase = esp->sreg & ESP_STAT_PMASK; + + /* need to check how much was sent ?? */ + fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); + + ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase)); + + ESPDATA(("(%d) ", i)); + + /* break if status phase !! */ + if(newphase == ESP_STATP) { + /* clear int. */ + esp->ireg = esp_read(eregs->esp_intrpt); + break; + } + + } + + /* clear int. */ + esp->ireg = esp_read(eregs->esp_intrpt); + + ESPDATA(("ir %x ... ", esp->ireg)); + + if (hmuch == 0) + ESPDATA(("done! \n")); + +#if 0 + local_irq_restore(flags); +#endif + + /* check new bus phase */ + if (newphase != oldphase && i < esp->current_transfer_size) { + /* something happened; disconnect ?? */ + ESPDATA(("phase change, dropped out with %d done ... ", i)); + break; + } + + /* check int. status */ + if (esp->ireg & ESP_INTR_DC) { + /* disconnect */ + ESPDATA(("disconnect; %d transferred ... ", i)); + break; + } else if (esp->ireg & ESP_INTR_FDONE) { + /* function done */ + ESPDATA(("function done; %d transferred ... ", i)); + break; + } + + /* XXX fixme: bail out on stall */ + if (fifo_stuck > 10) { + /* we're stuck */ + ESPDATA(("fifo stall; %d transferred ... ", i)); + break; + } + } + + ESPDATA(("\n")); + /* check successful completion ?? */ + + if (thisphase == in_dataout) + hmuch += fifocnt; /* stuck?? adjust data pointer ...*/ + + /* tell do_data_finale how much was transferred */ + esp->current_transfer_size -= hmuch; + + /* still not completely sure on this one ... */ + return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ; + + /* + * end PIO + */ + } + return do_intr_end; +} + +/* See how successful the data transfer was. */ +static int esp_do_data_finale(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + struct esp_device *esp_dev = SCptr->device->hostdata; + int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; + + if(esp->dma_led_off) + esp->dma_led_off(esp); + + ESPDATA(("esp_do_data_finale: ")); + + if(SCptr->SCp.phase == in_datain) { + if(esp->sreg & ESP_STAT_PERR) { + /* Yuck, parity error. The ESP asserts ATN + * so that we can go to message out phase + * immediately and inform the target that + * something bad happened. + */ + ESPLOG(("esp%d: data bad parity detected.\n", + esp->esp_id)); + esp->cur_msgout[0] = INITIATOR_ERROR; + esp->msgout_len = 1; + } + if(esp->dma_drain) + esp->dma_drain(esp); + } + if(esp->dma_invalidate) + esp->dma_invalidate(esp); + + /* This could happen for the above parity error case. */ + if(!(esp->ireg == ESP_INTR_BSERV)) { + /* Please go to msgout phase, please please please... */ + ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", + esp->esp_id)); + return esp_do_phase_determine(esp, eregs); + } + + /* Check for partial transfers and other horrible events. */ + fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); + ecount = esp_getcount(eregs); + if(esp->fas_premature_intr_workaround) + ecount -= 0x40; + bytes_sent = esp->current_transfer_size; + + ESPDATA(("trans_sz=%d, ", bytes_sent)); + if(!(esp->sreg & ESP_STAT_TCNT)) + bytes_sent -= ecount; + if(SCptr->SCp.phase == in_dataout) + bytes_sent -= fifocnt; + + ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent, + ecount, fifocnt)); + + /* If we were in synchronous mode, check for peculiarities. */ + if(esp_dev->sync_max_offset) + bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt); + else + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + + /* Until we are sure of what has happened, we are certainly + * in the dark. + */ + esp_advance_phase(SCptr, in_the_dark); + + /* Check for premature interrupt condition. Can happen on FAS2x6 + * chips. QLogic recommends a workaround by overprogramming the + * transfer counters, but this makes doing scatter-gather impossible. + * Until there is a way to disable scatter-gather for a single target, + * and not only for the entire host adapter as it is now, the workaround + * is way to expensive performance wise. + * Instead, it turns out that when this happens the target has disconnected + * already but it doesn't show in the interrupt register. Compensate for + * that here to try and avoid a SCSI bus reset. + */ + if(!esp->fas_premature_intr_workaround && (fifocnt == 1) && + sreg_dataoutp(esp->sreg)) { + ESPLOG(("esp%d: Premature interrupt, enabling workaround\n", + esp->esp_id)); +#if 0 + /* Disable scatter-gather operations, they are not possible + * when using this workaround. + */ + esp->ehost->sg_tablesize = 0; + esp->ehost->use_clustering = ENABLE_CLUSTERING; + esp->fas_premature_intr_workaround = 1; + bytes_sent = 0; + if(SCptr->use_sg) { + ESPLOG(("esp%d: Aborting scatter-gather operation\n", + esp->esp_id)); + esp->cur_msgout[0] = ABORT; + esp->msgout_len = 1; + esp->msgout_ctr = 0; + esp_cmd(esp, eregs, ESP_CMD_SATN); + esp_setcount(eregs, 0xffff); + esp_cmd(esp, eregs, ESP_CMD_NULL); + esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA); + return do_intr_end; + } +#else + /* Just set the disconnected bit. That's what appears to + * happen anyway. The state machine will pick it up when + * we return. + */ + esp->ireg |= ESP_INTR_DC; +#endif + } + + if(bytes_sent < 0) { + /* I've seen this happen due to lost state in this + * driver. No idea why it happened, but allowing + * this value to be negative caused things to + * lock up. This allows greater chance of recovery. + * In fact every time I've seen this, it has been + * a driver bug without question. + */ + ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); + ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", + esp->esp_id, + esp->current_transfer_size, fifocnt, ecount)); + ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", + esp->esp_id, + SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); + ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id, + SCptr->device->id)); + SCptr->device->borken = 1; + esp_dev->sync = 0; + bytes_sent = 0; + } + + /* Update the state of our transfer. */ + SCptr->SCp.ptr += bytes_sent; + SCptr->SCp.this_residual -= bytes_sent; + if(SCptr->SCp.this_residual < 0) { + /* shit */ + ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id)); + SCptr->SCp.this_residual = 0; + } + + /* Maybe continue. */ + if(!bogus_data) { + ESPDATA(("!bogus_data, ")); + /* NO MATTER WHAT, we advance the scatterlist, + * if the target should decide to disconnect + * in between scatter chunks (which is common) + * we could die horribly! I used to have the sg + * advance occur only if we are going back into + * (or are staying in) a data phase, you can + * imagine the hell I went through trying to + * figure this out. + */ + if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual) + advance_sg(esp, SCptr); +#ifdef DEBUG_ESP_DATA + if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { + ESPDATA(("to more data\n")); + } else { + ESPDATA(("to new phase\n")); + } +#endif + return esp_do_phase_determine(esp, eregs); + } + /* Bogus data, just wait for next interrupt. */ + ESPLOG(("esp%d: bogus_data during end of data phase\n", + esp->esp_id)); + return do_intr_end; +} + +/* We received a non-good status return at the end of + * running a SCSI command. This is used to decide if + * we should clear our synchronous transfer state for + * such a device when that happens. + * + * The idea is that when spinning up a disk or rewinding + * a tape, we don't want to go into a loop re-negotiating + * synchronous capabilities over and over. + */ +static int esp_should_clear_sync(Scsi_Cmnd *sp) +{ + unchar cmd1 = sp->cmnd[0]; + unchar cmd2 = sp->data_cmnd[0]; + + /* These cases are for spinning up a disk and + * waiting for that spinup to complete. + */ + if(cmd1 == START_STOP || + cmd2 == START_STOP) + return 0; + + if(cmd1 == TEST_UNIT_READY || + cmd2 == TEST_UNIT_READY) + return 0; + + /* One more special case for SCSI tape drives, + * this is what is used to probe the device for + * completion of a rewind or tape load operation. + */ + if(sp->device->type == TYPE_TAPE) { + if(cmd1 == MODE_SENSE || + cmd2 == MODE_SENSE) + return 0; + } + + return 1; +} + +/* Either a command is completing or a target is dropping off the bus + * to continue the command in the background so we can do other work. + */ +static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + int rval; + + rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing); + if(rval) + return rval; + + if(esp->ireg != ESP_INTR_DC) { + ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); + return do_reset_bus; /* target will not drop BSY... */ + } + esp->msgout_len = 0; + esp->prevmsgout = NOP; + if(esp->prevmsgin == COMMAND_COMPLETE) { + struct esp_device *esp_dev = SCptr->device->hostdata; + /* Normal end of nexus. */ + if(esp->disconnected_SC) + esp_cmd(esp, eregs, ESP_CMD_ESEL); + + if(SCptr->SCp.Status != GOOD && + SCptr->SCp.Status != CONDITION_GOOD && + ((1<<SCptr->device->id) & esp->targets_present) && + esp_dev->sync && esp_dev->sync_max_offset) { + /* SCSI standard says that the synchronous capabilities + * should be renegotiated at this point. Most likely + * we are about to request sense from this target + * in which case we want to avoid using sync + * transfers until we are sure of the current target + * state. + */ + ESPMISC(("esp: Status <%d> for target %d lun %d\n", + SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun)); + + /* But don't do this when spinning up a disk at + * boot time while we poll for completion as it + * fills up the console with messages. Also, tapes + * can report not ready many times right after + * loading up a tape. + */ + if(esp_should_clear_sync(SCptr) != 0) + esp_dev->sync = 0; + } + ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); + esp_done(esp, ((SCptr->SCp.Status & 0xff) | + ((SCptr->SCp.Message & 0xff)<<8) | + (DID_OK << 16))); + } else if(esp->prevmsgin == DISCONNECT) { + /* Normal disconnect. */ + esp_cmd(esp, eregs, ESP_CMD_ESEL); + ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); + append_SC(&esp->disconnected_SC, SCptr); + esp->current_SC = NULL; + if(esp->issue_SC) + esp_exec_cmd(esp); + } else { + /* Driver bug, we do not expect a disconnect here + * and should not have advanced the state engine + * to in_freeing. + */ + ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", + esp->esp_id)); + return do_reset_bus; + } + return do_intr_end; +} + +/* When a reselect occurs, and we cannot find the command to + * reconnect to in our queues, we do this. + */ +static int esp_bad_reconnect(struct NCR_ESP *esp) +{ + Scsi_Cmnd *sp; + + ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", + esp->esp_id)); + ESPLOG(("QUEUE DUMP\n")); + sp = esp->issue_SC; + ESPLOG(("esp%d: issue_SC[", esp->esp_id)); + while(sp) { + ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); + sp = (Scsi_Cmnd *) sp->host_scribble; + } + ESPLOG(("]\n")); + sp = esp->current_SC; + ESPLOG(("esp%d: current_SC[", esp->esp_id)); + while(sp) { + ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); + sp = (Scsi_Cmnd *) sp->host_scribble; + } + ESPLOG(("]\n")); + sp = esp->disconnected_SC; + ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); + while(sp) { + ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); + sp = (Scsi_Cmnd *) sp->host_scribble; + } + ESPLOG(("]\n")); + return do_reset_bus; +} + +/* Do the needy when a target tries to reconnect to us. */ +static int esp_do_reconnect(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + int lun, target; + Scsi_Cmnd *SCptr; + + /* Check for all bogus conditions first. */ + target = reconnect_target(esp, eregs); + if(target < 0) { + ESPDISC(("bad bus bits\n")); + return do_reset_bus; + } + lun = reconnect_lun(esp, eregs); + if(lun < 0) { + ESPDISC(("target=%2x, bad identify msg\n", target)); + return do_reset_bus; + } + + /* Things look ok... */ + ESPDISC(("R<%02x,%02x>", target, lun)); + + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + if(esp100_reconnect_hwbug(esp, eregs)) + return do_reset_bus; + esp_cmd(esp, eregs, ESP_CMD_NULL); + + SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun); + if(!SCptr) + return esp_bad_reconnect(esp); + + esp_connect(esp, eregs, SCptr); + esp_cmd(esp, eregs, ESP_CMD_MOK); + + /* Reconnect implies a restore pointers operation. */ + esp_restore_pointers(esp, SCptr); + + esp->snip = 0; + esp_advance_phase(SCptr, in_the_dark); + return do_intr_end; +} + +/* End of NEXUS (hopefully), pick up status + message byte then leave if + * all goes well. + */ +static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + int intr, rval; + + rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status); + if(rval) + return rval; + + intr = esp->ireg; + ESPSTAT(("esp_do_status: ")); + if(intr != ESP_INTR_DC) { + int message_out = 0; /* for parity problems */ + + /* Ack the message. */ + ESPSTAT(("ack msg, ")); + esp_cmd(esp, eregs, ESP_CMD_MOK); + + if(esp->dma_poll) + esp->dma_poll(esp, (unsigned char *) esp->esp_command); + + ESPSTAT(("got something, ")); + /* ESP chimes in with one of + * + * 1) function done interrupt: + * both status and message in bytes + * are available + * + * 2) bus service interrupt: + * only status byte was acquired + * + * 3) Anything else: + * can't happen, but we test for it + * anyways + * + * ALSO: If bad parity was detected on either + * the status _or_ the message byte then + * the ESP has asserted ATN on the bus + * and we must therefore wait for the + * next phase change. + */ + if(intr & ESP_INTR_FDONE) { + /* We got it all, hallejulia. */ + ESPSTAT(("got both, ")); + SCptr->SCp.Status = esp->esp_command[0]; + SCptr->SCp.Message = esp->esp_command[1]; + esp->prevmsgin = SCptr->SCp.Message; + esp->cur_msgin[0] = SCptr->SCp.Message; + if(esp->sreg & ESP_STAT_PERR) { + /* There was bad parity for the + * message byte, the status byte + * was ok. + */ + message_out = MSG_PARITY_ERROR; + } + } else if(intr == ESP_INTR_BSERV) { + /* Only got status byte. */ + ESPLOG(("esp%d: got status only, ", esp->esp_id)); + if(!(esp->sreg & ESP_STAT_PERR)) { + SCptr->SCp.Status = esp->esp_command[0]; + SCptr->SCp.Message = 0xff; + } else { + /* The status byte had bad parity. + * we leave the scsi_pointer Status + * field alone as we set it to a default + * of CHECK_CONDITION in esp_queue. + */ + message_out = INITIATOR_ERROR; + } + } else { + /* This shouldn't happen ever. */ + ESPSTAT(("got bolixed\n")); + esp_advance_phase(SCptr, in_the_dark); + return esp_do_phase_determine(esp, eregs); + } + + if(!message_out) { + ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, + SCptr->SCp.Message)); + if(SCptr->SCp.Message == COMMAND_COMPLETE) { + ESPSTAT(("and was COMMAND_COMPLETE\n")); + esp_advance_phase(SCptr, in_freeing); + return esp_do_freebus(esp, eregs); + } else { + ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", + esp->esp_id)); + esp->msgin_len = esp->msgin_ctr = 1; + esp_advance_phase(SCptr, in_msgindone); + return esp_do_msgindone(esp, eregs); + } + } else { + /* With luck we'll be able to let the target + * know that bad parity happened, it will know + * which byte caused the problems and send it + * again. For the case where the status byte + * receives bad parity, I do not believe most + * targets recover very well. We'll see. + */ + ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", + esp->esp_id, message_out)); + esp->cur_msgout[0] = message_out; + esp->msgout_len = esp->msgout_ctr = 1; + esp_advance_phase(SCptr, in_the_dark); + return esp_do_phase_determine(esp, eregs); + } + } else { + /* If we disconnect now, all hell breaks loose. */ + ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); + esp_advance_phase(SCptr, in_the_dark); + return esp_do_phase_determine(esp, eregs); + } +} + +static int esp_enter_status(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + unchar thecmd = ESP_CMD_ICCSEQ; + + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + + if(esp->do_pio_cmds) { + esp_advance_phase(esp->current_SC, in_status); + esp_cmd(esp, eregs, thecmd); + while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); + esp->esp_command[0] = esp_read(eregs->esp_fdata); + while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); + esp->esp_command[1] = esp_read(eregs->esp_fdata); + } else { + esp->esp_command[0] = esp->esp_command[1] = 0xff; + esp_write(eregs->esp_tclow, 2); + esp_write(eregs->esp_tcmed, 0); + esp->dma_init_read(esp, esp->esp_command_dvma, 2); + thecmd |= ESP_CMD_DMA; + esp_cmd(esp, eregs, thecmd); + esp_advance_phase(esp->current_SC, in_status); + } + + return esp_do_status(esp, eregs); +} + +static int esp_disconnect_amidst_phases(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + Scsi_Cmnd *sp = esp->current_SC; + struct esp_device *esp_dev = sp->device->hostdata; + + /* This means real problems if we see this + * here. Unless we were actually trying + * to force the device to abort/reset. + */ + ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id)); + ESPLOG(("pphase<%s> cphase<%s>, ", + phase_string(sp->SCp.phase), + phase_string(sp->SCp.sent_command))); + + if(esp->disconnected_SC) + esp_cmd(esp, eregs, ESP_CMD_ESEL); + + switch(esp->cur_msgout[0]) { + default: + /* We didn't expect this to happen at all. */ + ESPLOG(("device is bolixed\n")); + esp_advance_phase(sp, in_tgterror); + esp_done(esp, (DID_ERROR << 16)); + break; + + case BUS_DEVICE_RESET: + ESPLOG(("device reset successful\n")); + esp_dev->sync_max_offset = 0; + esp_dev->sync_min_period = 0; + esp_dev->sync = 0; + esp_advance_phase(sp, in_resetdev); + esp_done(esp, (DID_RESET << 16)); + break; + + case ABORT: + ESPLOG(("device abort successful\n")); + esp_advance_phase(sp, in_abortone); + esp_done(esp, (DID_ABORT << 16)); + break; + + }; + return do_intr_end; +} + +static int esp_enter_msgout(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + esp_advance_phase(esp->current_SC, in_msgout); + return esp_do_msgout(esp, eregs); +} + +static int esp_enter_msgin(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + esp_advance_phase(esp->current_SC, in_msgin); + return esp_do_msgin(esp, eregs); +} + +static int esp_enter_cmd(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + esp_advance_phase(esp->current_SC, in_cmdbegin); + return esp_do_cmdbegin(esp, eregs); +} + +static int esp_enter_badphase(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, + esp->sreg & ESP_STAT_PMASK)); + return do_reset_bus; +} + +typedef int (*espfunc_t)(struct NCR_ESP *, + struct ESP_regs *); + +static espfunc_t phase_vector[] = { + esp_do_data, /* ESP_DOP */ + esp_do_data, /* ESP_DIP */ + esp_enter_cmd, /* ESP_CMDP */ + esp_enter_status, /* ESP_STATP */ + esp_enter_badphase, /* ESP_STAT_PMSG */ + esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */ + esp_enter_msgout, /* ESP_MOP */ + esp_enter_msgin, /* ESP_MIP */ +}; + +/* The target has control of the bus and we have to see where it has + * taken us. + */ +static int esp_do_phase_determine(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + if ((esp->ireg & ESP_INTR_DC) != 0) + return esp_disconnect_amidst_phases(esp, eregs); + return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs); +} + +/* First interrupt after exec'ing a cmd comes here. */ +static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + struct esp_device *esp_dev = SCptr->device->hostdata; + int cmd_bytes_sent, fcnt; + + fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); + cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt); + if(esp->dma_invalidate) + esp->dma_invalidate(esp); + + /* Let's check to see if a reselect happened + * while we we're trying to select. This must + * be checked first. + */ + if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { + esp_reconnect(esp, SCptr); + return esp_do_reconnect(esp, eregs); + } + + /* Looks like things worked, we should see a bus service & + * a function complete interrupt at this point. Note we + * are doing a direct comparison because we don't want to + * be fooled into thinking selection was successful if + * ESP_INTR_DC is set, see below. + */ + if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { + /* target speaks... */ + esp->targets_present |= (1<<SCptr->device->id); + + /* What if the target ignores the sdtr? */ + if(esp->snip) + esp_dev->sync = 1; + + /* See how far, if at all, we got in getting + * the information out to the target. + */ + switch(esp->seqreg) { + default: + + case ESP_STEP_ASEL: + /* Arbitration won, target selected, but + * we are in some phase which is not command + * phase nor is it message out phase. + * + * XXX We've confused the target, obviously. + * XXX So clear it's state, but we also end + * XXX up clearing everyone elses. That isn't + * XXX so nice. I'd like to just reset this + * XXX target, but if I cannot even get it's + * XXX attention and finish selection to talk + * XXX to it, there is not much more I can do. + * XXX If we have a loaded bus we're going to + * XXX spend the next second or so renegotiating + * XXX for synchronous transfers. + */ + ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", + esp->esp_id, SCptr->device->id)); + + case ESP_STEP_SID: + /* Arbitration won, target selected, went + * to message out phase, sent one message + * byte, then we stopped. ATN is asserted + * on the SCSI bus and the target is still + * there hanging on. This is a legal + * sequence step if we gave the ESP a select + * and stop command. + * + * XXX See above, I could set the borken flag + * XXX in the device struct and retry the + * XXX command. But would that help for + * XXX tagged capable targets? + */ + + case ESP_STEP_NCMD: + /* Arbitration won, target selected, maybe + * sent the one message byte in message out + * phase, but we did not go to command phase + * in the end. Actually, we could have sent + * only some of the message bytes if we tried + * to send out the entire identify and tag + * message using ESP_CMD_SA3. + */ + cmd_bytes_sent = 0; + break; + + case ESP_STEP_PPC: + /* No, not the powerPC pinhead. Arbitration + * won, all message bytes sent if we went to + * message out phase, went to command phase + * but only part of the command was sent. + * + * XXX I've seen this, but usually in conjunction + * XXX with a gross error which appears to have + * XXX occurred between the time I told the + * XXX ESP to arbitrate and when I got the + * XXX interrupt. Could I have misloaded the + * XXX command bytes into the fifo? Actually, + * XXX I most likely missed a phase, and therefore + * XXX went into never never land and didn't even + * XXX know it. That was the old driver though. + * XXX What is even more peculiar is that the ESP + * XXX showed the proper function complete and + * XXX bus service bits in the interrupt register. + */ + + case ESP_STEP_FINI4: + case ESP_STEP_FINI5: + case ESP_STEP_FINI6: + case ESP_STEP_FINI7: + /* Account for the identify message */ + if(SCptr->SCp.phase == in_slct_norm) + cmd_bytes_sent -= 1; + }; + esp_cmd(esp, eregs, ESP_CMD_NULL); + + /* Be careful, we could really get fucked during synchronous + * data transfers if we try to flush the fifo now. + */ + if(!fcnt && /* Fifo is empty and... */ + /* either we are not doing synchronous transfers or... */ + (!esp_dev->sync_max_offset || + /* We are not going into data in phase. */ + ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) + esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */ + + /* See how far we got if this is not a slow command. */ + if(!esp->esp_slowcmd) { + if(cmd_bytes_sent < 0) + cmd_bytes_sent = 0; + if(cmd_bytes_sent != SCptr->cmd_len) { + /* Crapola, mark it as a slowcmd + * so that we have some chance of + * keeping the command alive with + * good luck. + * + * XXX Actually, if we didn't send it all + * XXX this means either we didn't set things + * XXX up properly (driver bug) or the target + * XXX or the ESP detected parity on one of + * XXX the command bytes. This makes much + * XXX more sense, and therefore this code + * XXX should be changed to send out a + * XXX parity error message or if the status + * XXX register shows no parity error then + * XXX just expect the target to bring the + * XXX bus into message in phase so that it + * XXX can send us the parity error message. + * XXX SCSI sucks... + */ + esp->esp_slowcmd = 1; + esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); + esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); + } + } + + /* Now figure out where we went. */ + esp_advance_phase(SCptr, in_the_dark); + return esp_do_phase_determine(esp, eregs); + } + + /* Did the target even make it? */ + if(esp->ireg == ESP_INTR_DC) { + /* wheee... nobody there or they didn't like + * what we told it to do, clean up. + */ + + /* If anyone is off the bus, but working on + * a command in the background for us, tell + * the ESP to listen for them. + */ + if(esp->disconnected_SC) + esp_cmd(esp, eregs, ESP_CMD_ESEL); + + if(((1<<SCptr->device->id) & esp->targets_present) && + esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE && + (SCptr->SCp.phase == in_slct_msg || + SCptr->SCp.phase == in_slct_stop)) { + /* shit */ + esp->snip = 0; + ESPLOG(("esp%d: Failed synchronous negotiation for target %d " + "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); + esp_dev->sync_max_offset = 0; + esp_dev->sync_min_period = 0; + esp_dev->sync = 1; /* so we don't negotiate again */ + + /* Run the command again, this time though we + * won't try to negotiate for synchronous transfers. + * + * XXX I'd like to do something like send an + * XXX INITIATOR_ERROR or ABORT message to the + * XXX target to tell it, "Sorry I confused you, + * XXX please come back and I will be nicer next + * XXX time". But that requires having the target + * XXX on the bus, and it has dropped BSY on us. + */ + esp->current_SC = NULL; + esp_advance_phase(SCptr, not_issued); + prepend_SC(&esp->issue_SC, SCptr); + esp_exec_cmd(esp); + return do_intr_end; + } + + /* Ok, this is normal, this is what we see during boot + * or whenever when we are scanning the bus for targets. + * But first make sure that is really what is happening. + */ + if(((1<<SCptr->device->id) & esp->targets_present)) { + ESPLOG(("esp%d: Warning, live target %d not responding to " + "selection.\n", esp->esp_id, SCptr->device->id)); + + /* This _CAN_ happen. The SCSI standard states that + * the target is to _not_ respond to selection if + * _it_ detects bad parity on the bus for any reason. + * Therefore, we assume that if we've talked successfully + * to this target before, bad parity is the problem. + */ + esp_done(esp, (DID_PARITY << 16)); + } else { + /* Else, there really isn't anyone there. */ + ESPMISC(("esp: selection failure, maybe nobody there?\n")); + ESPMISC(("esp: target %d lun %d\n", + SCptr->device->id, SCptr->device->lun)); + esp_done(esp, (DID_BAD_TARGET << 16)); + } + return do_intr_end; + } + + + ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); + printk("esp%d: Currently -- ", esp->esp_id); + esp_print_ireg(esp->ireg); + printk(" "); + esp_print_statreg(esp->sreg); + printk(" "); + esp_print_seqreg(esp->seqreg); + printk("\n"); + printk("esp%d: New -- ", esp->esp_id); + esp->sreg = esp_read(eregs->esp_status); + esp->seqreg = esp_read(eregs->esp_sstep); + esp->ireg = esp_read(eregs->esp_intrpt); + esp_print_ireg(esp->ireg); + printk(" "); + esp_print_statreg(esp->sreg); + printk(" "); + esp_print_seqreg(esp->seqreg); + printk("\n"); + ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); + return do_reset_bus; /* ugh... */ +} + +/* Continue reading bytes for msgin phase. */ +static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + if(esp->ireg & ESP_INTR_BSERV) { + /* in the right phase too? */ + if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { + /* phew... */ + esp_cmd(esp, eregs, ESP_CMD_TI); + esp_advance_phase(esp->current_SC, in_msgindone); + return do_intr_end; + } + + /* We changed phase but ESP shows bus service, + * in this case it is most likely that we, the + * hacker who has been up for 20hrs straight + * staring at the screen, drowned in coffee + * smelling like retched cigarette ashes + * have miscoded something..... so, try to + * recover as best we can. + */ + ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id)); + } + esp_advance_phase(esp->current_SC, in_the_dark); + return do_phase_determine; +} + +static int check_singlebyte_msg(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + esp->prevmsgin = esp->cur_msgin[0]; + if(esp->cur_msgin[0] & 0x80) { + /* wheee... */ + ESPLOG(("esp%d: target sends identify amidst phases\n", + esp->esp_id)); + esp_advance_phase(esp->current_SC, in_the_dark); + return 0; + } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) || + (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { + esp->msgin_len = 2; + esp_advance_phase(esp->current_SC, in_msgincont); + return 0; + } + esp_advance_phase(esp->current_SC, in_the_dark); + switch(esp->cur_msgin[0]) { + default: + /* We don't want to hear about it. */ + ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, + esp->cur_msgin[0])); + return MESSAGE_REJECT; + + case NOP: + ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, + esp->current_SC->device->id)); + return 0; + + case RESTORE_POINTERS: + /* In this case we might also have to backup the + * "slow command" pointer. It is rare to get such + * a save/restore pointer sequence so early in the + * bus transition sequences, but cover it. + */ + if(esp->esp_slowcmd) { + esp->esp_scmdleft = esp->current_SC->cmd_len; + esp->esp_scmdp = &esp->current_SC->cmnd[0]; + } + esp_restore_pointers(esp, esp->current_SC); + return 0; + + case SAVE_POINTERS: + esp_save_pointers(esp, esp->current_SC); + return 0; + + case COMMAND_COMPLETE: + case DISCONNECT: + /* Freeing the bus, let it go. */ + esp->current_SC->SCp.phase = in_freeing; + return 0; + + case MESSAGE_REJECT: + ESPMISC(("msg reject, ")); + if(esp->prevmsgout == EXTENDED_MESSAGE) { + struct esp_device *esp_dev = esp->current_SC->device->hostdata; + + /* Doesn't look like this target can + * do synchronous or WIDE transfers. + */ + ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); + esp_dev->sync = 1; + esp_dev->wide = 1; + esp_dev->sync_min_period = 0; + esp_dev->sync_max_offset = 0; + return 0; + } else { + ESPMISC(("not sync nego, sending ABORT\n")); + return ABORT; + } + }; +} + +/* Target negotiates for synchronous transfers before we do, this + * is legal although very strange. What is even funnier is that + * the SCSI2 standard specifically recommends against targets doing + * this because so many initiators cannot cope with this occurring. + */ +static int target_with_ants_in_pants(struct NCR_ESP *esp, + Scsi_Cmnd *SCptr, + struct esp_device *esp_dev) +{ + if(esp_dev->sync || SCptr->device->borken) { + /* sorry, no can do */ + ESPSDTR(("forcing to async, ")); + build_sync_nego_msg(esp, 0, 0); + esp_dev->sync = 1; + esp->snip = 1; + ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); + esp_advance_phase(SCptr, in_the_dark); + return EXTENDED_MESSAGE; + } + + /* Ok, we'll check them out... */ + return 0; +} + +static void sync_report(struct NCR_ESP *esp) +{ + int msg3, msg4; + char *type; + + msg3 = esp->cur_msgin[3]; + msg4 = esp->cur_msgin[4]; + if(msg4) { + int hz = 1000000000 / (msg3 * 4); + int integer = hz / 1000000; + int fraction = (hz - (integer * 1000000)) / 10000; + if((msg3 * 4) < 200) { + type = "FAST"; + } else { + type = "synchronous"; + } + + /* Do not transform this back into one big printk + * again, it triggers a bug in our sparc64-gcc272 + * sibling call optimization. -DaveM + */ + ESPLOG((KERN_INFO "esp%d: target %d ", + esp->esp_id, esp->current_SC->device->id)); + ESPLOG(("[period %dns offset %d %d.%02dMHz ", + (int) msg3 * 4, (int) msg4, + integer, fraction)); + ESPLOG(("%s SCSI%s]\n", type, + (((msg3 * 4) < 200) ? "-II" : ""))); + } else { + ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n", + esp->esp_id, esp->current_SC->device->id)); + } +} + +static int check_multibyte_msg(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + struct esp_device *esp_dev = SCptr->device->hostdata; + unchar regval = 0; + int message_out = 0; + + ESPSDTR(("chk multibyte msg: ")); + if(esp->cur_msgin[2] == EXTENDED_SDTR) { + int period = esp->cur_msgin[3]; + int offset = esp->cur_msgin[4]; + + ESPSDTR(("is sync nego response, ")); + if(!esp->snip) { + int rval; + + /* Target negotiates first! */ + ESPSDTR(("target jumps the gun, ")); + message_out = EXTENDED_MESSAGE; /* we must respond */ + rval = target_with_ants_in_pants(esp, SCptr, esp_dev); + if(rval) + return rval; + } + + ESPSDTR(("examining sdtr, ")); + + /* Offset cannot be larger than ESP fifo size. */ + if(offset > 15) { + ESPSDTR(("offset too big %2x, ", offset)); + offset = 15; + ESPSDTR(("sending back new offset\n")); + build_sync_nego_msg(esp, period, offset); + return EXTENDED_MESSAGE; + } + + if(offset && period > esp->max_period) { + /* Yeee, async for this slow device. */ + ESPSDTR(("period too long %2x, ", period)); + build_sync_nego_msg(esp, 0, 0); + ESPSDTR(("hoping for msgout\n")); + esp_advance_phase(esp->current_SC, in_the_dark); + return EXTENDED_MESSAGE; + } else if (offset && period < esp->min_period) { + ESPSDTR(("period too short %2x, ", period)); + period = esp->min_period; + if(esp->erev > esp236) + regval = 4; + else + regval = 5; + } else if(offset) { + int tmp; + + ESPSDTR(("period is ok, ")); + tmp = esp->ccycle / 1000; + regval = (((period << 2) + tmp - 1) / tmp); + if(regval && (esp->erev > esp236)) { + if(period >= 50) + regval--; + } + } + + if(offset) { + unchar bit; + + esp_dev->sync_min_period = (regval & 0x1f); + esp_dev->sync_max_offset = (offset | esp->radelay); + if(esp->erev > esp236) { + if(esp->erev == fas100a) + bit = ESP_CONFIG3_FAST; + else + bit = ESP_CONFIG3_FSCSI; + if(period < 50) + esp->config3[SCptr->device->id] |= bit; + else + esp->config3[SCptr->device->id] &= ~bit; + esp->prev_cfg3 = esp->config3[SCptr->device->id]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + } + esp->prev_soff = esp_dev->sync_min_period; + esp_write(eregs->esp_soff, esp->prev_soff); + esp->prev_stp = esp_dev->sync_max_offset; + esp_write(eregs->esp_stp, esp->prev_stp); + + ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", + esp_dev->sync_max_offset, + esp_dev->sync_min_period, + esp->config3[SCptr->device->id])); + + esp->snip = 0; + } else if(esp_dev->sync_max_offset) { + unchar bit; + + /* back to async mode */ + ESPSDTR(("unaccaptable sync nego, forcing async\n")); + esp_dev->sync_max_offset = 0; + esp_dev->sync_min_period = 0; + esp->prev_soff = 0; + esp_write(eregs->esp_soff, 0); + esp->prev_stp = 0; + esp_write(eregs->esp_stp, 0); + if(esp->erev > esp236) { + if(esp->erev == fas100a) + bit = ESP_CONFIG3_FAST; + else + bit = ESP_CONFIG3_FSCSI; + esp->config3[SCptr->device->id] &= ~bit; + esp->prev_cfg3 = esp->config3[SCptr->device->id]; + esp_write(eregs->esp_cfg3, esp->prev_cfg3); + } + } + + sync_report(esp); + + ESPSDTR(("chk multibyte msg: sync is known, ")); + esp_dev->sync = 1; + + if(message_out) { + ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", + esp->esp_id)); + build_sync_nego_msg(esp, period, offset); + esp_advance_phase(SCptr, in_the_dark); + return EXTENDED_MESSAGE; + } + + ESPSDTR(("returning zero\n")); + esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ + return 0; + } else if(esp->cur_msgin[2] == EXTENDED_WDTR) { + ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id)); + message_out = MESSAGE_REJECT; + } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { + ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); + message_out = MESSAGE_REJECT; + } + esp_advance_phase(SCptr, in_the_dark); + return message_out; +} + +static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + int message_out = 0, it = 0, rval; + + rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone); + if(rval) + return rval; + if(SCptr->SCp.sent_command != in_status) { + if(!(esp->ireg & ESP_INTR_DC)) { + if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { + message_out = MSG_PARITY_ERROR; + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + } else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) { + /* We certainly dropped the ball somewhere. */ + message_out = INITIATOR_ERROR; + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + } else if(!esp->msgin_len) { + it = esp_read(eregs->esp_fdata); + esp_advance_phase(SCptr, in_msgincont); + } else { + /* it is ok and we want it */ + it = esp->cur_msgin[esp->msgin_ctr] = + esp_read(eregs->esp_fdata); + esp->msgin_ctr++; + } + } else { + esp_advance_phase(SCptr, in_the_dark); + return do_work_bus; + } + } else { + it = esp->cur_msgin[0]; + } + if(!message_out && esp->msgin_len) { + if(esp->msgin_ctr < esp->msgin_len) { + esp_advance_phase(SCptr, in_msgincont); + } else if(esp->msgin_len == 1) { + message_out = check_singlebyte_msg(esp, eregs); + } else if(esp->msgin_len == 2) { + if(esp->cur_msgin[0] == EXTENDED_MESSAGE) { + if((it+2) >= 15) { + message_out = MESSAGE_REJECT; + } else { + esp->msgin_len = (it + 2); + esp_advance_phase(SCptr, in_msgincont); + } + } else { + message_out = MESSAGE_REJECT; /* foo on you */ + } + } else { + message_out = check_multibyte_msg(esp, eregs); + } + } + if(message_out < 0) { + return -message_out; + } else if(message_out) { + if(((message_out != 1) && + ((message_out < 0x20) || (message_out & 0x80)))) + esp->msgout_len = 1; + esp->cur_msgout[0] = message_out; + esp_cmd(esp, eregs, ESP_CMD_SATN); + esp_advance_phase(SCptr, in_the_dark); + esp->msgin_len = 0; + } + esp->sreg = esp_read(eregs->esp_status); + esp->sreg &= ~(ESP_STAT_INTR); + if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) + esp_cmd(esp, eregs, ESP_CMD_MOK); + if((SCptr->SCp.sent_command == in_msgindone) && + (SCptr->SCp.phase == in_freeing)) + return esp_do_freebus(esp, eregs); + return do_intr_end; +} + +static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + unsigned char tmp; + Scsi_Cmnd *SCptr = esp->current_SC; + + esp_advance_phase(SCptr, in_cmdend); + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + tmp = *esp->esp_scmdp++; + esp->esp_scmdleft--; + esp_write(eregs->esp_fdata, tmp); + esp_cmd(esp, eregs, ESP_CMD_TI); + return do_intr_end; +} + +static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + esp_cmd(esp, eregs, ESP_CMD_NULL); + if(esp->ireg & ESP_INTR_BSERV) { + esp_advance_phase(esp->current_SC, in_the_dark); + return esp_do_phase_determine(esp, eregs); + } + ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", + esp->esp_id)); + return do_reset_bus; +} + +static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + switch(esp->msgout_len) { + case 1: + esp_write(eregs->esp_fdata, esp->cur_msgout[0]); + esp_cmd(esp, eregs, ESP_CMD_TI); + break; + + case 2: + if(esp->do_pio_cmds){ + esp_write(eregs->esp_fdata, esp->cur_msgout[0]); + esp_write(eregs->esp_fdata, esp->cur_msgout[1]); + esp_cmd(esp, eregs, ESP_CMD_TI); + } else { + esp->esp_command[0] = esp->cur_msgout[0]; + esp->esp_command[1] = esp->cur_msgout[1]; + esp->dma_setup(esp, esp->esp_command_dvma, 2, 0); + esp_setcount(eregs, 2); + esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); + } + break; + + case 4: + esp->snip = 1; + if(esp->do_pio_cmds){ + esp_write(eregs->esp_fdata, esp->cur_msgout[0]); + esp_write(eregs->esp_fdata, esp->cur_msgout[1]); + esp_write(eregs->esp_fdata, esp->cur_msgout[2]); + esp_write(eregs->esp_fdata, esp->cur_msgout[3]); + esp_cmd(esp, eregs, ESP_CMD_TI); + } else { + esp->esp_command[0] = esp->cur_msgout[0]; + esp->esp_command[1] = esp->cur_msgout[1]; + esp->esp_command[2] = esp->cur_msgout[2]; + esp->esp_command[3] = esp->cur_msgout[3]; + esp->dma_setup(esp, esp->esp_command_dvma, 4, 0); + esp_setcount(eregs, 4); + esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); + } + break; + + case 5: + esp->snip = 1; + if(esp->do_pio_cmds){ + esp_write(eregs->esp_fdata, esp->cur_msgout[0]); + esp_write(eregs->esp_fdata, esp->cur_msgout[1]); + esp_write(eregs->esp_fdata, esp->cur_msgout[2]); + esp_write(eregs->esp_fdata, esp->cur_msgout[3]); + esp_write(eregs->esp_fdata, esp->cur_msgout[4]); + esp_cmd(esp, eregs, ESP_CMD_TI); + } else { + esp->esp_command[0] = esp->cur_msgout[0]; + esp->esp_command[1] = esp->cur_msgout[1]; + esp->esp_command[2] = esp->cur_msgout[2]; + esp->esp_command[3] = esp->cur_msgout[3]; + esp->esp_command[4] = esp->cur_msgout[4]; + esp->dma_setup(esp, esp->esp_command_dvma, 5, 0); + esp_setcount(eregs, 5); + esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); + } + break; + + default: + /* whoops */ + ESPMISC(("bogus msgout sending NOP\n")); + esp->cur_msgout[0] = NOP; + esp_write(eregs->esp_fdata, esp->cur_msgout[0]); + esp->msgout_len = 1; + esp_cmd(esp, eregs, ESP_CMD_TI); + break; + } + esp_advance_phase(esp->current_SC, in_msgoutdone); + return do_intr_end; +} + +static int esp_do_msgoutdone(struct NCR_ESP *esp, + struct ESP_regs *eregs) +{ + if((esp->msgout_len > 1) && esp->dma_barrier) + esp->dma_barrier(esp); + + if(!(esp->ireg & ESP_INTR_DC)) { + esp_cmd(esp, eregs, ESP_CMD_NULL); + switch(esp->sreg & ESP_STAT_PMASK) { + case ESP_MOP: + /* whoops, parity error */ + ESPLOG(("esp%d: still in msgout, parity error assumed\n", + esp->esp_id)); + if(esp->msgout_len > 1) + esp_cmd(esp, eregs, ESP_CMD_SATN); + esp_advance_phase(esp->current_SC, in_msgout); + return do_work_bus; + + case ESP_DIP: + break; + + default: + if(!fcount(esp, eregs) && + !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset)) + esp_cmd(esp, eregs, ESP_CMD_FLUSH); + break; + + }; + } + + /* If we sent out a synchronous negotiation message, update + * our state. + */ + if(esp->cur_msgout[2] == EXTENDED_MESSAGE && + esp->cur_msgout[4] == EXTENDED_SDTR) { + esp->snip = 1; /* anal retentiveness... */ + } + + esp->prevmsgout = esp->cur_msgout[0]; + esp->msgout_len = 0; + esp_advance_phase(esp->current_SC, in_the_dark); + return esp_do_phase_determine(esp, eregs); +} + +static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + ESPLOG(("esp%d: command in weird state %2x\n", + esp->esp_id, esp->current_SC->SCp.phase)); + return do_reset_bus; +} + +static espfunc_t bus_vector[] = { + esp_do_data_finale, + esp_do_data_finale, + esp_bus_unexpected, + esp_do_msgin, + esp_do_msgincont, + esp_do_msgindone, + esp_do_msgout, + esp_do_msgoutdone, + esp_do_cmdbegin, + esp_do_cmddone, + esp_do_status, + esp_do_freebus, + esp_do_phase_determine, + esp_bus_unexpected, + esp_bus_unexpected, + esp_bus_unexpected, +}; + +/* This is the second tier in our dual-level SCSI state machine. */ +static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs) +{ + Scsi_Cmnd *SCptr = esp->current_SC; + unsigned int phase; + + ESPBUS(("esp_work_bus: ")); + if(!SCptr) { + ESPBUS(("reconnect\n")); + return esp_do_reconnect(esp, eregs); + } + phase = SCptr->SCp.phase; + if ((phase & 0xf0) == in_phases_mask) + return bus_vector[(phase & 0x0f)](esp, eregs); + else if((phase & 0xf0) == in_slct_mask) + return esp_select_complete(esp, eregs); + else + return esp_bus_unexpected(esp, eregs); +} + +static espfunc_t isvc_vector[] = { + NULL, + esp_do_phase_determine, + esp_do_resetbus, + esp_finish_reset, + esp_work_bus +}; + +/* Main interrupt handler for an esp adapter. */ +void esp_handle(struct NCR_ESP *esp) +{ + struct ESP_regs *eregs; + Scsi_Cmnd *SCptr; + int what_next = do_intr_end; + eregs = esp->eregs; + SCptr = esp->current_SC; + + if(esp->dma_irq_entry) + esp->dma_irq_entry(esp); + + /* Check for errors. */ + esp->sreg = esp_read(eregs->esp_status); + esp->sreg &= (~ESP_STAT_INTR); + esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS); + esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */ + ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n", + esp->sreg, esp->seqreg, esp->ireg)); + if(esp->sreg & (ESP_STAT_SPAM)) { + /* Gross error, could be due to one of: + * + * - top of fifo overwritten, could be because + * we tried to do a synchronous transfer with + * an offset greater than ESP fifo size + * + * - top of command register overwritten + * + * - DMA setup to go in one direction, SCSI + * bus points in the other, whoops + * + * - weird phase change during asynchronous + * data phase while we are initiator + */ + ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); + + /* If a command is live on the bus we cannot safely + * reset the bus, so we'll just let the pieces fall + * where they may. Here we are hoping that the + * target will be able to cleanly go away soon + * so we can safely reset things. + */ + if(!SCptr) { + ESPLOG(("esp%d: No current cmd during gross error, " + "resetting bus\n", esp->esp_id)); + what_next = do_reset_bus; + goto state_machine; + } + } + + /* No current cmd is only valid at this point when there are + * commands off the bus or we are trying a reset. + */ + if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { + /* Panic is safe, since current_SC is null. */ + ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); + panic("esp_handle: current_SC == penguin within interrupt!"); + } + + if(esp->ireg & (ESP_INTR_IC)) { + /* Illegal command fed to ESP. Outside of obvious + * software bugs that could cause this, there is + * a condition with ESP100 where we can confuse the + * ESP into an erroneous illegal command interrupt + * because it does not scrape the FIFO properly + * for reselection. See esp100_reconnect_hwbug() + * to see how we try very hard to avoid this. + */ + ESPLOG(("esp%d: invalid command\n", esp->esp_id)); + + esp_dump_state(esp, eregs); + + if(SCptr) { + /* Devices with very buggy firmware can drop BSY + * during a scatter list interrupt when using sync + * mode transfers. We continue the transfer as + * expected, the target drops the bus, the ESP + * gets confused, and we get a illegal command + * interrupt because the bus is in the disconnected + * state now and ESP_CMD_TI is only allowed when + * a nexus is alive on the bus. + */ + ESPLOG(("esp%d: Forcing async and disabling disconnect for " + "target %d\n", esp->esp_id, SCptr->device->id)); + SCptr->device->borken = 1; /* foo on you */ + } + + what_next = do_reset_bus; + } else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { + int phase; + + if(SCptr) { + phase = SCptr->SCp.phase; + if(phase & in_phases_mask) { + what_next = esp_work_bus(esp, eregs); + } else if(phase & in_slct_mask) { + what_next = esp_select_complete(esp, eregs); + } else { + ESPLOG(("esp%d: interrupt for no good reason...\n", + esp->esp_id)); + what_next = do_intr_end; + } + } else { + ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", + esp->esp_id)); + what_next = do_reset_bus; + } + } else if(esp->ireg & ESP_INTR_SR) { + ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); + what_next = do_reset_complete; + } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { + ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", + esp->esp_id)); + what_next = do_reset_bus; + } else if(esp->ireg & ESP_INTR_RSEL) { + if(!SCptr) { + /* This is ok. */ + what_next = esp_do_reconnect(esp, eregs); + } else if(SCptr->SCp.phase & in_slct_mask) { + /* Only selection code knows how to clean + * up properly. + */ + ESPDISC(("Reselected during selection attempt\n")); + what_next = esp_select_complete(esp, eregs); + } else { + ESPLOG(("esp%d: Reselected while bus is busy\n", + esp->esp_id)); + what_next = do_reset_bus; + } + } + + /* This is tier-one in our dual level SCSI state machine. */ +state_machine: + while(what_next != do_intr_end) { + if (what_next >= do_phase_determine && + what_next < do_intr_end) + what_next = isvc_vector[what_next](esp, eregs); + else { + /* state is completely lost ;-( */ + ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", + esp->esp_id)); + what_next = do_reset_bus; + } + } + if(esp->dma_irq_exit) + esp->dma_irq_exit(esp); +} + +#ifndef CONFIG_SMP +irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs) +{ + struct NCR_ESP *esp; + unsigned long flags; + int again; + struct Scsi_Host *dev = dev_id; + + /* Handle all ESP interrupts showing at this IRQ level. */ + spin_lock_irqsave(dev->host_lock, flags); +repeat: + again = 0; + for_each_esp(esp) { +#ifndef __mips__ + if(((esp)->irq & 0xff) == irq) { +#endif + if(esp->dma_irq_p(esp)) { + again = 1; + + esp->dma_ints_off(esp); + + ESPIRQ(("I%d(", esp->esp_id)); + esp_handle(esp); + ESPIRQ((")")); + + esp->dma_ints_on(esp); + } +#ifndef __mips__ + } +#endif + } + if(again) + goto repeat; + spin_unlock_irqrestore(dev->host_lock, flags); + return IRQ_HANDLED; +} +#else +/* For SMP we only service one ESP on the list list at our IRQ level! */ +irqreturn_t esp_intr(int irq, void *dev_id, struct pt_regs *pregs) +{ + struct NCR_ESP *esp; + unsigned long flags; + struct Scsi_Host *dev = dev_id; + + /* Handle all ESP interrupts showing at this IRQ level. */ + spin_lock_irqsave(dev->host_lock, flags); + for_each_esp(esp) { + if(((esp)->irq & 0xf) == irq) { + if(esp->dma_irq_p(esp)) { + esp->dma_ints_off(esp); + + ESPIRQ(("I[%d:%d](", + smp_processor_id(), esp->esp_id)); + esp_handle(esp); + ESPIRQ((")")); + + esp->dma_ints_on(esp); + goto out; + } + } + } +out: + spin_unlock_irqrestore(dev->host_lock, flags); + return IRQ_HANDLED; +} +#endif + +int esp_slave_alloc(Scsi_Device *SDptr) +{ + struct esp_device *esp_dev = + kmalloc(sizeof(struct esp_device), GFP_ATOMIC); + + if (!esp_dev) + return -ENOMEM; + memset(esp_dev, 0, sizeof(struct esp_device)); + SDptr->hostdata = esp_dev; + return 0; +} + +void esp_slave_destroy(Scsi_Device *SDptr) +{ + struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata; + + esp->targets_present &= ~(1 << SDptr->id); + kfree(SDptr->hostdata); + SDptr->hostdata = NULL; +} + +#ifdef MODULE +int init_module(void) { return 0; } +void cleanup_module(void) {} +void esp_release(void) +{ + esps_in_use--; + esps_running = esps_in_use; +} +#endif + +EXPORT_SYMBOL(esp_abort); +EXPORT_SYMBOL(esp_allocate); +EXPORT_SYMBOL(esp_deallocate); +EXPORT_SYMBOL(esp_initialize); +EXPORT_SYMBOL(esp_intr); +EXPORT_SYMBOL(esp_queue); +EXPORT_SYMBOL(esp_reset); +EXPORT_SYMBOL(esp_slave_alloc); +EXPORT_SYMBOL(esp_slave_destroy); +EXPORT_SYMBOL(esps_in_use); + +MODULE_LICENSE("GPL"); |