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Diffstat (limited to 'sys/alpha/tc/esp.c')
| -rw-r--r-- | sys/alpha/tc/esp.c | 1898 |
1 files changed, 1898 insertions, 0 deletions
diff --git a/sys/alpha/tc/esp.c b/sys/alpha/tc/esp.c new file mode 100644 index 0000000..1a860c2 --- /dev/null +++ b/sys/alpha/tc/esp.c @@ -0,0 +1,1898 @@ +/* $Id$ */ +/* $NetBSD: esp.c,v 1.8.4.2 1996/09/10 17:28:16 cgd Exp $ */ + +/* + * Copyright (c) 1994 Peter Galbavy + * Copyright (c) 1995 Paul Kranenburg + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by Peter Galbavy + * 4. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, + * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + */ + +/* + * Based on aic6360 by Jarle Greipsland + * + * Acknowledgements: Many of the algorithms used in this driver are + * inspired by the work of Julian Elischer (julian@tfs.com) and + * Charles Hannum (mycroft@duality.gnu.ai.mit.edu). Thanks a million! + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <sys/device.h> + +#include <sys/errno.h> +/*#include <sys/ioctl.h>*/ +#include <sys/device.h> +#include <sys/buf.h> +#include <sys/proc.h> +/*#include <sys/user.h>*/ +#include <sys/queue.h> + +#include <scsi/scsi_all.h> +#include <scsi/scsiconf.h> +#include <scsi/scsi_message.h> + +#include <machine/cpu.h> +#include <machine/clock.h> +#include <alpha/tc/tcreg.h> +#include <alpha/tc/tcvar.h> +#include <alpha/tc/tcdsreg.h> +#include <alpha/tc/tcdsvar.h> +#include <alpha/tc/espreg.h> +#include <alpha/tc/espvar.h> + +int esp_debug = 0; /*ESP_SHOWPHASE|ESP_SHOWMISC|ESP_SHOWTRAC|ESP_SHOWCMDS;*/ + +/*static*/ void espattach __P((struct device *, struct device *, void *)); +/*static*/ int espmatch __P((struct device *, void *, void *)); +/*static*/ int espprint __P((void *, char *)); +/*static*/ u_int esp_adapter_info __P((struct esp_softc *)); +/*static*/ void espreadregs __P((struct esp_softc *)); +/*static*/ void espselect __P((struct esp_softc *, + u_char, u_char, u_char *, u_char)); +/*static*/ void esp_scsi_reset __P((struct esp_softc *)); +/*static*/ void esp_reset __P((struct esp_softc *)); +/*static*/ void esp_init __P((struct esp_softc *, int)); +/*static*/ int esp_scsi_cmd __P((struct scsi_xfer *)); +/*static*/ int esp_poll __P((struct esp_softc *, struct ecb *)); +/*static*/ void esp_sched __P((struct esp_softc *)); +/*static*/ void esp_done __P((struct ecb *)); +/*static*/ void esp_msgin __P((struct esp_softc *)); +/*static*/ void esp_msgout __P((struct esp_softc *)); +/*static*/ int espintr __P((struct esp_softc *)); +/*static*/ void esp_timeout __P((void *arg)); +/*static*/ void esp_abort __P((struct esp_softc *, struct ecb *)); +static u_int32_t esp_info __P((int)); +int esp_stp2cpb __P((struct esp_softc *, int)); +int esp_cpb2stp __P((struct esp_softc *, int)); + +static void esp_min_phys (struct buf *); +static int esp_probe(device_t dev); +static int esp_attach(device_t dev); +static device_method_t esp_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, esp_probe), + DEVMETHOD(device_attach, esp_attach), + {0, 0} +}; +#define ESP_SOFTC(dev) (struct esp_softc*) device_get_softc(dev) +static driver_t esp_driver = { + "esp", + esp_methods, + DRIVER_TYPE_BIO, + sizeof(struct esp_softc), +}; + + +struct scsi_adapter esp_switch = { + esp_scsi_cmd, + esp_min_phys, /* no max at this level; handled by DMA code */ + NULL, + NULL, + esp_info, + "esp", +}; + +struct scsi_device esp_dev = { + NULL, /* Use default error handler */ + NULL, /* have a queue, served by this */ + NULL, /* have no async handler */ + NULL, /* Use default 'done' routine */ +}; +static devclass_t esp_devclass; +DRIVER_MODULE(esp, tcds, esp_driver, esp_devclass, 0, 0); + +static int +esp_probe(device_t dev) +{ + if(strcmp(device_get_name(device_get_parent(dev)),"tcds")){ + return ENXIO; + } else { + device_set_desc(dev,"NCR53C94"); + return(0); + } +} + +/* + * Attach this instance, and then all the sub-devices + */ +int +esp_attach(device_t dev) +{ + struct esp_softc *sc = device_get_softc(dev); + struct tcdsdev_attach_args *tcdsdev = device_get_ivars(dev); + struct scsibus_data *scbus; + + sc->sc_reg = (volatile u_int32_t *)tcdsdev->tcdsda_addr; + sc->sc_cookie = tcdsdev->tcdsda_cookie; + sc->sc_dma = tcdsdev->tcdsda_sc; + + tcds_intr_establish(device_get_parent(dev), sc->sc_cookie, 0,(int (*)(void *))espintr, sc); + +/* if (parent->dv_cfdata->cf_driver == &tcds_cd) { + sc->sc_id = tcdsdev->tcdsda_id; + sc->sc_freq = tcdsdev->tcdsda_freq; + } else*/ { + /* XXX */ + sc->sc_id = 7; + sc->sc_freq = 25000000; + } + + /* gimme Mhz */ + sc->sc_freq /= 1000000; + sc->sc_dma->sc_esp = sc; /* XXX */ + + /* + * It is necessary to try to load the 2nd config register here, + * to find out what rev the esp chip is, else the esp_reset + * will not set up the defaults correctly. + */ + sc->sc_cfg1 = sc->sc_id | ESPCFG1_PARENB; + sc->sc_cfg2 = ESPCFG2_SCSI2; + sc->sc_cfg3 = 0x4; /* Save residual byte. XXX??? */ + sc->sc_rev = NCR53C94; + + /* + * This is the value used to start sync negotiations + * Note that the ESP register "SYNCTP" is programmed + * in "clocks per byte", and has a minimum value of 4. + * The SCSI period used in negotiation is one-fourth + * of the time (in nanoseconds) needed to transfer one byte. + * Since the chip's clock is given in MHz, we have the following + * formula: 4 * period = (1000 / freq) * 4 + */ + sc->sc_minsync = 1000 / sc->sc_freq; + + sc->sc_maxxfer = 64 * 1024; + sc->sc_ccf = FREQTOCCF(sc->sc_freq); + + /* The value *must not* be == 1. Make it 2 */ + if (sc->sc_ccf == 1) + sc->sc_ccf = 2; + + /* + * The recommended timeout is 250ms. This register is loaded + * with a value calculated as follows, from the docs: + * + * (timout period) x (CLK frequency) + * reg = ------------------------------------- + * 8192 x (Clock Conversion Factor) + * + * Since CCF has a linear relation to CLK, this generally computes + * to the constant of 153. + */ + sc->sc_timeout = ((250 * 1000) * sc->sc_freq) / (8192 * sc->sc_ccf); + + /* CCF register only has 3 bits; 0 is actually 8 */ + sc->sc_ccf &= 7; + + /* Reset state & bus */ + sc->sc_state = 0; + esp_init(sc, 1); + + printf("esp%d: %dMhz, target %d\n", device_get_unit(dev),sc->sc_freq, sc->sc_id); + + /* + * fill in the prototype scsi_link. + */ + sc->sc_link.adapter_softc = sc; + sc->sc_link.adapter_targ = sc->sc_id; + sc->sc_link.adapter = &esp_switch; + sc->sc_link.device = &esp_dev; +/* sc->sc_link.openings = 2;*/ + sc->sc_link.fordriver = 0; + + /* + * If the boot path is "esp" at the moment and it's me, then + * walk our pointer to the sub-device, ready for the config + * below. + */ + /* + * Now try to attach all the sub-devices + */ +/* config_found(self, &sc->sc_link, espprint);*/ + scbus = scsi_alloc_bus(); + if(!scbus) + return ENXIO; + scbus->adapter_link = &sc->sc_link; + + scbus->maxtarg = 7; + + if (bootverbose) { + unsigned t_from = 0; + unsigned t_to = scbus->maxtarg; + unsigned myaddr = sc->sc_id; + + char *txt_and = ""; + printf ("esp%d scanning for targets ", device_get_unit(dev)); + if (t_from < myaddr) { + printf ("%d..%d ", t_from, myaddr -1); + txt_and = "and "; + } + if (myaddr < t_to) + printf ("%s%d..%d ", txt_and, myaddr +1, t_to); + } + + scsi_attachdevs (scbus); + scbus = NULL; /* Upper-level SCSI code owns this now */ + + + return 0; +} + +/* + * This is the generic esp reset function. It does not reset the SCSI bus, + * only this controllers, but kills any on-going commands, and also stops + * and resets the DMA. + * + * After reset, registers are loaded with the defaults from the attach + * routine above. + */ +void +esp_reset(sc) + struct esp_softc *sc; +{ + + /* reset DMA first */ + DMA_RESET(sc->sc_dma); + + /* reset SCSI chip */ + ESPCMD(sc, ESPCMD_RSTCHIP); + ESPCMD(sc, ESPCMD_NOP); + DELAY(500); + + /* do these backwards, and fall through */ + switch (sc->sc_rev) { + case NCR53C94: + case ESP200: + ESP_WRITE_REG(sc, ESP_CFG3, sc->sc_cfg3); + case ESP100A: + ESP_WRITE_REG(sc, ESP_CFG2, sc->sc_cfg2); + case ESP100: + ESP_WRITE_REG(sc, ESP_CFG1, sc->sc_cfg1); + ESP_WRITE_REG(sc, ESP_CCF, sc->sc_ccf); + ESP_WRITE_REG(sc, ESP_SYNCOFF, 0); + ESP_WRITE_REG(sc, ESP_TIMEOUT, sc->sc_timeout); + break; + default: + printf("%s: unknown revision code, assuming ESP100\n", + sc->sc_dev.dv_xname); + ESP_WRITE_REG(sc, ESP_CFG1, sc->sc_cfg1); + ESP_WRITE_REG(sc, ESP_CCF, sc->sc_ccf); + ESP_WRITE_REG(sc, ESP_SYNCOFF, 0); + ESP_WRITE_REG(sc, ESP_TIMEOUT, sc->sc_timeout); + } +} + +/* + * Reset the SCSI bus, but not the chip + */ +void +esp_scsi_reset(sc) + struct esp_softc *sc; +{ + /* + * XXX STOP DMA FIRST + */ + + printf("esp: resetting SCSI bus\n"); + ESPCMD(sc, ESPCMD_RSTSCSI); +} + +u_int32_t esp_info (int unit) +{ + return (1); /* may be changed later */ +} + + + +/* + * Initialize esp state machine + */ +void +esp_init(sc, doreset) + struct esp_softc *sc; + int doreset; +{ + struct ecb *ecb; + int r; + + ESP_TRACE(("[ESP_INIT(%d)] ", doreset)); + + if (sc->sc_state == 0) { /* First time through */ + TAILQ_INIT(&sc->ready_list); + TAILQ_INIT(&sc->nexus_list); + TAILQ_INIT(&sc->free_list); + sc->sc_nexus = NULL; + ecb = sc->sc_ecb; + bzero(ecb, sizeof(sc->sc_ecb)); + for (r = 0; r < sizeof(sc->sc_ecb) / sizeof(*ecb); r++) { + TAILQ_INSERT_TAIL(&sc->free_list, ecb, chain); + ECB_SETQ(ecb, ECB_QFREE); + ecb++; + } + bzero(sc->sc_tinfo, sizeof(sc->sc_tinfo)); + } else { + sc->sc_flags |= ESP_ABORTING; + sc->sc_state = ESP_IDLE; + ecb = sc->sc_nexus; + if (ecb != NULL) { + ecb->xs->error = XS_TIMEOUT; + esp_done(ecb); + sc->sc_nexus = NULL; + } + while ((ecb = sc->nexus_list.tqh_first) != NULL) { + ecb->xs->error = XS_TIMEOUT; + esp_done(ecb); + } + } + + /* + * reset the chip to a known state + */ + esp_reset(sc); + + sc->sc_phase = sc->sc_prevphase = INVALID_PHASE; + for (r = 0; r < 8; r++) { + struct esp_tinfo *tp = &sc->sc_tinfo[r]; +/* XXX - config flags per target: low bits: no reselect; high bits: no synch */ +/* int fl = sc->sc_dev.dv_cfdata->cf_flags;*/ +int fl=0; + tp->flags = ((sc->sc_minsync && !(fl & (1<<(r+8)))) + ? T_NEGOTIATE : 0) | + ((fl & (1<<r)) ? T_RSELECTOFF : 0) | + T_NEED_TO_RESET; + tp->period = sc->sc_minsync; + tp->offset = 0; + } + sc->sc_flags &= ~ESP_ABORTING; + + if (doreset) { + sc->sc_state = ESP_SBR; + ESPCMD(sc, ESPCMD_RSTSCSI); + return; + } + + sc->sc_state = ESP_IDLE; + esp_sched(sc); + return; +} + +/* + * Read the ESP registers, and save their contents for later use. + * ESP_STAT, ESP_STEP & ESP_INTR are mostly zeroed out when reading + * ESP_INTR - so make sure it is the last read. + * + * I think that (from reading the docs) most bits in these registers + * only make sense when he DMA CSR has an interrupt showing. Call only + * if an interrupt is pending. + */ +void +espreadregs(sc) + struct esp_softc *sc; +{ + + sc->sc_espstat = ESP_READ_REG(sc, ESP_STAT); + /* Only the stepo bits are of interest */ + sc->sc_espstep = ESP_READ_REG(sc, ESP_STEP) & ESPSTEP_MASK; + sc->sc_espintr = ESP_READ_REG(sc, ESP_INTR); + + /* Clear the TCDS interrupt bit. */ + (void)tcds_scsi_isintr(sc->sc_dma, 1); + + /* + * Determine the SCSI bus phase, return either a real SCSI bus phase + * or some pseudo phase we use to detect certain exceptions. + */ + + sc->sc_phase = (sc->sc_espintr & ESPINTR_DIS) + ? /* Disconnected */ BUSFREE_PHASE + : sc->sc_espstat & ESPSTAT_PHASE; + + ESP_MISC(("regs[intr=%02x,stat=%02x,step=%02x] ", + sc->sc_espintr, sc->sc_espstat, sc->sc_espstep)); +} + +/* + * Convert Synchronous Transfer Period to chip register Clock Per Byte value. + */ +int +esp_stp2cpb(sc, period) + struct esp_softc *sc; + int period; +{ + int v; + v = (sc->sc_freq * period) / 250; + if (esp_cpb2stp(sc, v) < period) + /* Correct round-down error */ + v++; + return v; +} + +/* + * Convert chip register Clock Per Byte value to Synchronous Transfer Period. + */ +int +esp_cpb2stp(sc, cpb) + struct esp_softc *sc; + int cpb; +{ + return ((250 * cpb) / sc->sc_freq); +} + +/* + * Send a command to a target, set the driver state to ESP_SELECTING + * and let the caller take care of the rest. + * + * Keeping this as a function allows me to say that this may be done + * by DMA instead of programmed I/O soon. + */ +void +espselect(sc, target, lun, cmd, clen) + struct esp_softc *sc; + u_char target, lun; + u_char *cmd; + u_char clen; +{ + struct esp_tinfo *ti = &sc->sc_tinfo[target]; + int i; + + ESP_TRACE(("[espselect(t%d,l%d,cmd:%x)] ", target, lun, *(u_char *)cmd)); + + /* new state ESP_SELECTING */ + sc->sc_state = ESP_SELECTING; + + ESPCMD(sc, ESPCMD_FLUSH); + + /* + * The docs say the target register is never reset, and I + * can't think of a better place to set it + */ + ESP_WRITE_REG(sc, ESP_SELID, target); + if (ti->flags & T_SYNCMODE) { + ESP_WRITE_REG(sc, ESP_SYNCOFF, ti->offset); + ESP_WRITE_REG(sc, ESP_SYNCTP, esp_stp2cpb(sc, ti->period)); + } else { + ESP_WRITE_REG(sc, ESP_SYNCOFF, 0); + ESP_WRITE_REG(sc, ESP_SYNCTP, 0); + } + + /* + * Who am I. This is where we tell the target that we are + * happy for it to disconnect etc. + */ + ESP_WRITE_REG(sc, ESP_FIFO, + MSG_IDENTIFY(lun, (ti->flags & T_RSELECTOFF)?0:1)); + + if (ti->flags & T_NEGOTIATE) { + /* Arbitrate, select and stop after IDENTIFY message */ + ESPCMD(sc, ESPCMD_SELATNS); + return; + } + + /* Now the command into the FIFO */ + for (i = 0; i < clen; i++) + ESP_WRITE_REG(sc, ESP_FIFO, *cmd++); + + /* And get the targets attention */ + ESPCMD(sc, ESPCMD_SELATN); +} + +/* + * DRIVER FUNCTIONS CALLABLE FROM HIGHER LEVEL DRIVERS + */ + +/* + * Start a SCSI-command + * This function is called by the higher level SCSI-driver to queue/run + * SCSI-commands. + */ +int +esp_scsi_cmd(xs) + struct scsi_xfer *xs; +{ + struct scsi_link *sc_link = xs->sc_link; + struct esp_softc *sc = sc_link->adapter_softc; + struct ecb *ecb; + int s, flags; + + ESP_TRACE(("[esp_scsi_cmd] ")); + ESP_CMDS(("[0x%x, %d]->%d ", (int)xs->cmd->opcode, xs->cmdlen, + sc_link->target)); + + flags = xs->flags; + + /* Get a esp command block */ + s = splbio(); + ecb = sc->free_list.tqh_first; + if (ecb) { + TAILQ_REMOVE(&sc->free_list, ecb, chain); + ECB_SETQ(ecb, ECB_QNONE); + } + splx(s); + + if (ecb == NULL) { + ESP_MISC(("TRY_AGAIN_LATER")); + return TRY_AGAIN_LATER; + } + + /* Initialize ecb */ + ecb->xs = xs; + bcopy(xs->cmd, &ecb->cmd, xs->cmdlen); + ecb->clen = xs->cmdlen; + ecb->daddr = xs->data; + ecb->dleft = xs->datalen; + ecb->stat = 0; + + s = splbio(); + TAILQ_INSERT_TAIL(&sc->ready_list, ecb, chain); + ECB_SETQ(ecb, ECB_QREADY); + ecb->timeout_ch = timeout(esp_timeout, ecb, (xs->timeout*hz)/1000); + + if (sc->sc_state == ESP_IDLE) + esp_sched(sc); + + splx(s); + + if (flags & SCSI_NOMASK) { + /* Not allowed to use interrupts, use polling instead */ + return esp_poll(sc, ecb); + } + + ESP_MISC(("SUCCESSFULLY_QUEUED")); + return SUCCESSFULLY_QUEUED; +} + +/* + * Used when interrupt driven I/O isn't allowed, e.g. during boot. + */ +int +esp_poll(sc, ecb) + struct esp_softc *sc; + struct ecb *ecb; +{ + struct scsi_xfer *xs = ecb->xs; + int count = xs->timeout * 100; + + ESP_TRACE(("[esp_poll] ")); + while (count) { + if (DMA_ISINTR(sc->sc_dma)) { + espintr(sc); + } +#if alternatively + if (ESP_READ_REG(sc, ESP_STAT) & ESPSTAT_INT) + espintr(sc); +#endif + if (xs->flags & ITSDONE) + break; + DELAY(10); + if (sc->sc_state == ESP_IDLE) { + ESP_TRACE(("[esp_poll: rescheduling] ")); + esp_sched(sc); + } + count--; + } + + if (count == 0) { + ESP_MISC(("esp_poll: timeout")); + esp_timeout((caddr_t)ecb); + } + + return COMPLETE; +} + + +/* + * LOW LEVEL SCSI UTILITIES + */ + +/* + * Schedule a scsi operation. This has now been pulled out of the interrupt + * handler so that we may call it from esp_scsi_cmd and esp_done. This may + * save us an unecessary interrupt just to get things going. Should only be + * called when state == ESP_IDLE and at bio pl. + */ +void +esp_sched(sc) + struct esp_softc *sc; +{ + struct scsi_link *sc_link; + struct ecb *ecb; + int t; + + ESP_TRACE(("[esp_sched] ")); + if (sc->sc_state != ESP_IDLE) + panic("esp_sched: not IDLE (state=%d)", sc->sc_state); + + if (sc->sc_flags & ESP_ABORTING) + return; + + /* + * Find first ecb in ready queue that is for a target/lunit + * combinations that is not busy. + */ + for (ecb = sc->ready_list.tqh_first; ecb; ecb = ecb->chain.tqe_next) { + sc_link = ecb->xs->sc_link; + t = sc_link->target; + if (!(sc->sc_tinfo[t].lubusy & (1 << sc_link->lun))) { + struct esp_tinfo *ti = &sc->sc_tinfo[t]; + + if ((ecb->flags & ECB_QBITS) != ECB_QREADY) + panic("esp: busy entry on ready list"); + TAILQ_REMOVE(&sc->ready_list, ecb, chain); + ECB_SETQ(ecb, ECB_QNONE); + sc->sc_nexus = ecb; + sc->sc_flags = 0; + sc->sc_prevphase = INVALID_PHASE; + sc->sc_dp = ecb->daddr; + sc->sc_dleft = ecb->dleft; + ti->lubusy |= (1<<sc_link->lun); +/*XXX*/if (sc->sc_msgpriq) { + printf("esp: message queue not empty: %x!\n", sc->sc_msgpriq); +} +/*XXX*/sc->sc_msgpriq = sc->sc_msgout = 0; + espselect(sc, t, sc_link->lun, + (u_char *)&ecb->cmd, ecb->clen); + break; + } else + ESP_MISC(("%d:%d busy\n", t, sc_link->lun)); + } +} + +/* + * POST PROCESSING OF SCSI_CMD (usually current) + */ +void +esp_done(ecb) + struct ecb *ecb; +{ + struct scsi_xfer *xs = ecb->xs; + struct scsi_link *sc_link = xs->sc_link; + struct esp_softc *sc = sc_link->adapter_softc; + struct esp_tinfo *ti = &sc->sc_tinfo[sc_link->target]; + + ESP_TRACE(("[esp_done(error:%x)] ", xs->error)); + + untimeout(esp_timeout, ecb, ecb->timeout_ch); + + /* + * Now, if we've come here with no error code, i.e. we've kept the + * initial XS_NOERROR, and the status code signals that we should + * check sense, we'll need to set up a request sense cmd block and + * push the command back into the ready queue *before* any other + * commands for this target/lunit, else we lose the sense info. + * We don't support chk sense conditions for the request sense cmd. + */ + if (xs->error == XS_NOERROR) { + if ((ecb->flags & ECB_ABORTED) != 0) { + xs->error = XS_TIMEOUT; + } else if ((ecb->flags & ECB_CHKSENSE) != 0) { + xs->error = XS_SENSE; + } else if ((ecb->stat & ST_MASK) == SCSI_CHECK) { + struct scsi_sense *ss = (void *)&ecb->cmd; + ESP_MISC(("requesting sense ")); + /* First, save the return values */ + xs->resid = ecb->dleft; + xs->status = ecb->stat; + /* Next, setup a request sense command block */ + bzero(ss, sizeof(*ss)); + ss->op_code = REQUEST_SENSE; + /*ss->byte2 = sc_link->lun << 5;*/ + ss->length = sizeof(struct scsi_sense_data); + ecb->clen = sizeof(*ss); + ecb->daddr = (char *)&xs->sense; + ecb->dleft = sizeof(struct scsi_sense_data); + ecb->flags |= ECB_CHKSENSE; +/*XXX - must take off queue here */ + if (ecb != sc->sc_nexus) { + panic("%s: esp_sched: floating ecb %p", + sc->sc_dev.dv_xname, ecb); + } + TAILQ_INSERT_HEAD(&sc->ready_list, ecb, chain); + ECB_SETQ(ecb, ECB_QREADY); + ti->lubusy &= ~(1<<sc_link->lun); + ti->senses++; + timeout(esp_timeout, ecb, (xs->timeout*hz)/1000); + if (sc->sc_nexus == ecb) { + sc->sc_nexus = NULL; + sc->sc_state = ESP_IDLE; + esp_sched(sc); + } + return; + } else { + xs->resid = ecb->dleft; + } + } + + xs->flags |= ITSDONE; + +#ifdef ESP_DEBUG + if (esp_debug & ESP_SHOWMISC) { + printf("err=0x%02x ",xs->error); + if (xs->error == XS_SENSE) { + printf("sense=%2x; ", xs->sense.error_code); + } + } + if ((xs->resid || xs->error > XS_SENSE) && esp_debug & ESP_SHOWMISC) { + if (xs->resid) + printf("esp_done: resid=%d\n", xs->resid); + if (xs->error) + printf("esp_done: error=%d\n", xs->error); + } +#endif + + /* + * Remove the ECB from whatever queue it's on. + */ + switch (ecb->flags & ECB_QBITS) { + case ECB_QNONE: + if (ecb != sc->sc_nexus) { + panic("%s: floating ecb", sc->sc_dev.dv_xname); + } + sc->sc_nexus = NULL; + sc->sc_state = ESP_IDLE; + ti->lubusy &= ~(1<<sc_link->lun); + esp_sched(sc); + break; + case ECB_QREADY: + TAILQ_REMOVE(&sc->ready_list, ecb, chain); + break; + case ECB_QNEXUS: + TAILQ_REMOVE(&sc->nexus_list, ecb, chain); + ti->lubusy &= ~(1<<sc_link->lun); + break; + case ECB_QFREE: + panic("%s: dequeue: busy ecb on free list", + sc->sc_dev.dv_xname); + break; + default: + panic("%s: dequeue: unknown queue %d", + sc->sc_dev.dv_xname, ecb->flags & ECB_QBITS); + } + + /* Put it on the free list, and clear flags. */ + TAILQ_INSERT_HEAD(&sc->free_list, ecb, chain); + ecb->flags = ECB_QFREE; + + ti->cmds++; + scsi_done(xs); + return; +} + +/* + * INTERRUPT/PROTOCOL ENGINE + */ + +/* + * Schedule an outgoing message by prioritizing it, and asserting + * attention on the bus. We can only do this when we are the initiator + * else there will be an illegal command interrupt. + */ +#define esp_sched_msgout(m) \ + do { \ + ESP_MISC(("esp_sched_msgout %d ", m)); \ + ESPCMD(sc, ESPCMD_SETATN); \ + sc->sc_msgpriq |= (m); \ + } while (0) + +#define IS1BYTEMSG(m) (((m) != 1 && (m) < 0x20) || (m) & 0x80) +#define IS2BYTEMSG(m) (((m) & 0xf0) == 0x20) +#define ISEXTMSG(m) ((m) == 1) + +/* + * Get an incoming message as initiator. + * + * The SCSI bus must already be in MESSAGE_IN_PHASE and there is a + * byte in the FIFO + */ +void +esp_msgin(sc) + register struct esp_softc *sc; +{ + register int v; + + ESP_TRACE(("[esp_msgin(curmsglen:%d)] ", sc->sc_imlen)); + + if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) == 0) { + printf("%s: msgin: no msg byte available\n", + sc->sc_dev.dv_xname); + return; + } + + /* + * Prepare for a new message. A message should (according + * to the SCSI standard) be transmitted in one single + * MESSAGE_IN_PHASE. If we have been in some other phase, + * then this is a new message. + */ + if (sc->sc_prevphase != MESSAGE_IN_PHASE) { + sc->sc_flags &= ~ESP_DROP_MSGI; + sc->sc_imlen = 0; + } + + v = ESP_READ_REG(sc, ESP_FIFO); + ESP_MISC(("<msgbyte:0x%02x>", v)); + +#if 0 + if (sc->sc_state == ESP_RESELECTED && sc->sc_imlen == 0) { + /* + * Which target is reselecting us? (The ID bit really) + */ + sc->sc_selid = v; + sc->sc_selid &= ~(1<<sc->sc_id); + ESP_MISC(("selid=0x%2x ", sc->sc_selid)); + return; + } +#endif + + sc->sc_imess[sc->sc_imlen] = v; + + /* + * If we're going to reject the message, don't bother storing + * the incoming bytes. But still, we need to ACK them. + */ + + if ((sc->sc_flags & ESP_DROP_MSGI)) { + ESPCMD(sc, ESPCMD_SETATN); + ESPCMD(sc, ESPCMD_MSGOK); + printf("<dropping msg byte %x>", + sc->sc_imess[sc->sc_imlen]); + return; + } + + if (sc->sc_imlen >= ESP_MAX_MSG_LEN) { + esp_sched_msgout(SEND_REJECT); + sc->sc_flags |= ESP_DROP_MSGI; + } else { + sc->sc_imlen++; + /* + * This testing is suboptimal, but most + * messages will be of the one byte variety, so + * it should not effect performance + * significantly. + */ + if (sc->sc_imlen == 1 && IS1BYTEMSG(sc->sc_imess[0])) + goto gotit; + if (sc->sc_imlen == 2 && IS2BYTEMSG(sc->sc_imess[0])) + goto gotit; + if (sc->sc_imlen >= 3 && ISEXTMSG(sc->sc_imess[0]) && + sc->sc_imlen == sc->sc_imess[1] + 2) + goto gotit; + } + /* Ack what we have so far */ + ESPCMD(sc, ESPCMD_MSGOK); + return; + +gotit: + ESP_MSGS(("gotmsg(%x)", sc->sc_imess[0])); + /* + * Now we should have a complete message (1 byte, 2 byte + * and moderately long extended messages). We only handle + * extended messages which total length is shorter than + * ESP_MAX_MSG_LEN. Longer messages will be amputated. + */ + if (sc->sc_state == ESP_HASNEXUS) { + struct ecb *ecb = sc->sc_nexus; + struct esp_tinfo *ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; + + switch (sc->sc_imess[0]) { + case MSG_CMDCOMPLETE: + ESP_MSGS(("cmdcomplete ")); + if (sc->sc_dleft < 0) { + struct scsi_link *sc_link = ecb->xs->sc_link; + printf("esp: %d extra bytes from %d:%d\n", + -sc->sc_dleft, + sc_link->target, sc_link->lun); + sc->sc_dleft = 0; + } + ecb->xs->resid = ecb->dleft = sc->sc_dleft; + sc->sc_flags |= ESP_BUSFREE_OK; + break; + + case MSG_MESSAGE_REJECT: + if (esp_debug & ESP_SHOWMSGS) + printf("%s: our msg rejected by target\n", + sc->sc_dev.dv_xname); +#if 1 /* XXX - must remember last message */ +sc_print_addr(ecb->xs->sc_link); printf("MSG_MESSAGE_REJECT>>"); +#endif + if (sc->sc_flags & ESP_SYNCHNEGO) { + ti->period = ti->offset = 0; + sc->sc_flags &= ~ESP_SYNCHNEGO; + ti->flags &= ~T_NEGOTIATE; + } + /* Not all targets understand INITIATOR_DETECTED_ERR */ + if (sc->sc_msgout == SEND_INIT_DET_ERR) + esp_sched_msgout(SEND_ABORT); + break; + case MSG_NOOP: + ESP_MSGS(("noop ")); + break; + case MSG_DISCONNECT: + ESP_MSGS(("disconnect ")); + ti->dconns++; + sc->sc_flags |= ESP_DISCON; + sc->sc_flags |= ESP_BUSFREE_OK; +#define SDEV_AUTOSAVE (0x01) + if ((ecb->xs->sc_link->quirks & SDEV_AUTOSAVE) == 0) + break; + /*FALLTHROUGH*/ + case MSG_SAVEDATAPOINTER: + ESP_MSGS(("save datapointer ")); + ecb->dleft = sc->sc_dleft; + ecb->daddr = sc->sc_dp; + break; + case MSG_RESTOREPOINTERS: + ESP_MSGS(("restore datapointer ")); + if (!ecb) { + esp_sched_msgout(SEND_ABORT); + printf("%s: no DATAPOINTERs to restore\n", + sc->sc_dev.dv_xname); + break; + } + sc->sc_dp = ecb->daddr; + sc->sc_dleft = ecb->dleft; + break; + case MSG_PARITY_ERROR: + printf("%s:target%d: MSG_PARITY_ERROR\n", + sc->sc_dev.dv_xname, + ecb->xs->sc_link->target); + break; + case MSG_EXTENDED: + ESP_MSGS(("extended(%x) ", sc->sc_imess[2])); + switch (sc->sc_imess[2]) { + case MSG_EXT_SDTR: + ESP_MSGS(("SDTR period %d, offset %d ", + sc->sc_imess[3], sc->sc_imess[4])); + ti->period = sc->sc_imess[3]; + ti->offset = sc->sc_imess[4]; + if (sc->sc_minsync == 0) { + /* We won't do synch */ + ti->offset = 0; + esp_sched_msgout(SEND_SDTR); + } else if (ti->offset == 0) { + printf("%s:%d: async\n", "esp", + ecb->xs->sc_link->target); + ti->offset = 0; + sc->sc_flags &= ~ESP_SYNCHNEGO; + } else if (ti->period > 124) { + printf("%s:%d: async\n", "esp", + ecb->xs->sc_link->target); + ti->offset = 0; + esp_sched_msgout(SEND_SDTR); + } else { + int r = 250/ti->period; + int s = (100*250)/ti->period - 100*r; + int p; + p = esp_stp2cpb(sc, ti->period); + ti->period = esp_cpb2stp(sc, p); +#ifdef ESP_DEBUG + sc_print_addr(ecb->xs->sc_link); +#endif + if ((sc->sc_flags&ESP_SYNCHNEGO) == 0) { + /* Target initiated negotiation */ + if (ti->flags & T_SYNCMODE) { + ti->flags &= ~T_SYNCMODE; +#ifdef ESP_DEBUG + printf("renegotiated "); +#endif + } + ESP_WRITE_REG(sc, ESP_SYNCOFF, + 0); + ESP_WRITE_REG(sc, ESP_SYNCTP, + 0); + /* Clamp to our maxima */ + if (ti->period < sc->sc_minsync) + ti->period = sc->sc_minsync; + if (ti->offset > 15) + ti->offset = 15; + esp_sched_msgout(SEND_SDTR); + } else { + /* we are sync */ + sc->sc_flags &= ~ESP_SYNCHNEGO; + ESP_WRITE_REG(sc, ESP_SYNCOFF, + ti->offset); + ESP_WRITE_REG(sc, ESP_SYNCTP, + p); + ti->flags |= T_SYNCMODE; + } +#ifdef ESP_DEBUG + printf("max sync rate %d.%02dMb/s\n", + r, s); +#endif + } + ti->flags &= ~T_NEGOTIATE; + break; + default: /* Extended messages we don't handle */ + ESPCMD(sc, ESPCMD_SETATN); + break; + } + break; + default: + ESP_MSGS(("ident ")); + /* thanks for that ident... */ + if (!MSG_ISIDENTIFY(sc->sc_imess[0])) { + ESP_MISC(("unknown ")); +printf("%s: unimplemented message: %d\n", sc->sc_dev.dv_xname, sc->sc_imess[0]); + ESPCMD(sc, ESPCMD_SETATN); + } + break; + } + } else if (sc->sc_state == ESP_RESELECTED) { + struct scsi_link *sc_link = NULL; + struct ecb *ecb; + struct esp_tinfo *ti; + u_char lunit; + + if (MSG_ISIDENTIFY(sc->sc_imess[0])) { /* Identify? */ + ESP_MISC(("searching ")); + /* + * Search wait queue for disconnected cmd + * The list should be short, so I haven't bothered with + * any more sophisticated structures than a simple + * singly linked list. + */ + lunit = sc->sc_imess[0] & 0x07; + for (ecb = sc->nexus_list.tqh_first; ecb; + ecb = ecb->chain.tqe_next) { + sc_link = ecb->xs->sc_link; + if (sc_link->lun == lunit && + sc->sc_selid == (1<<sc_link->target)) { + TAILQ_REMOVE(&sc->nexus_list, ecb, + chain); + ECB_SETQ(ecb, ECB_QNONE); + break; + } + } + + if (!ecb) { /* Invalid reselection! */ + esp_sched_msgout(SEND_ABORT); + printf("esp: invalid reselect (idbit=0x%2x)\n", + sc->sc_selid); + } else { /* Reestablish nexus */ + /* + * Setup driver data structures and + * do an implicit RESTORE POINTERS + */ + ti = &sc->sc_tinfo[sc_link->target]; + sc->sc_nexus = ecb; + sc->sc_dp = ecb->daddr; + sc->sc_dleft = ecb->dleft; + sc->sc_tinfo[sc_link->target].lubusy + |= (1<<sc_link->lun); + if (ti->flags & T_SYNCMODE) { + ESP_WRITE_REG(sc, ESP_SYNCOFF, + ti->offset); + ESP_WRITE_REG(sc, ESP_SYNCTP, + esp_stp2cpb(sc, ti->period)); + } else { + ESP_WRITE_REG(sc, ESP_SYNCOFF, 0); + ESP_WRITE_REG(sc, ESP_SYNCTP, 0); + } + ESP_MISC(("... found ecb")); + sc->sc_state = ESP_HASNEXUS; + } + } else { + printf("%s: bogus reselect (no IDENTIFY) %0x2x\n", + sc->sc_dev.dv_xname, sc->sc_selid); + esp_sched_msgout(SEND_DEV_RESET); + } + } else { /* Neither ESP_HASNEXUS nor ESP_RESELECTED! */ + printf("%s: unexpected message in; will send DEV_RESET\n", + sc->sc_dev.dv_xname); + esp_sched_msgout(SEND_DEV_RESET); + } + + /* Ack last message byte */ + ESPCMD(sc, ESPCMD_MSGOK); + + /* Done, reset message pointer. */ + sc->sc_flags &= ~ESP_DROP_MSGI; + sc->sc_imlen = 0; +} + + +/* + * Send the highest priority, scheduled message + */ +void +esp_msgout(sc) + register struct esp_softc *sc; +{ + struct esp_tinfo *ti; + struct ecb *ecb; + size_t size; + + ESP_TRACE(("[esp_msgout(priq:%x, prevphase:%x)]", sc->sc_msgpriq, sc->sc_prevphase)); + + if (sc->sc_prevphase != MESSAGE_OUT_PHASE) { + /* Pick up highest priority message */ + sc->sc_msgout = sc->sc_msgpriq & -sc->sc_msgpriq; + sc->sc_omlen = 1; /* "Default" message len */ + switch (sc->sc_msgout) { + case SEND_SDTR: + ecb = sc->sc_nexus; + ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; + sc->sc_omess[0] = MSG_EXTENDED; + sc->sc_omess[1] = 3; + sc->sc_omess[2] = MSG_EXT_SDTR; + sc->sc_omess[3] = ti->period; + sc->sc_omess[4] = ti->offset; + sc->sc_omlen = 5; + break; + case SEND_IDENTIFY: + if (sc->sc_state != ESP_HASNEXUS) { + printf("esp at line %d: no nexus", __LINE__); + } + ecb = sc->sc_nexus; + sc->sc_omess[0] = MSG_IDENTIFY(ecb->xs->sc_link->lun,0); + break; + case SEND_DEV_RESET: + sc->sc_omess[0] = MSG_BUS_DEV_RESET; + sc->sc_flags |= ESP_BUSFREE_OK; + ecb = sc->sc_nexus; + ti = &sc->sc_tinfo[ecb->xs->sc_link->target]; + ti->flags &= ~T_SYNCMODE; + ti->flags |= T_NEGOTIATE; + break; + case SEND_PARITY_ERROR: + sc->sc_omess[0] = MSG_PARITY_ERROR; + break; + case SEND_ABORT: + sc->sc_omess[0] = MSG_ABORT; + sc->sc_flags |= ESP_BUSFREE_OK; + break; + case SEND_INIT_DET_ERR: + sc->sc_omess[0] = MSG_INITIATOR_DET_ERR; + break; + case SEND_REJECT: + sc->sc_omess[0] = MSG_MESSAGE_REJECT; + break; + default: + sc->sc_omess[0] = MSG_NOOP; + break; + } + sc->sc_omp = sc->sc_omess; + } + +#if 1 + /* (re)send the message */ + size = min(sc->sc_omlen, sc->sc_maxxfer); + DMA_SETUP(sc->sc_dma, &sc->sc_omp, &sc->sc_omlen, 0, &size); + /* Program the SCSI counter */ + ESP_WRITE_REG(sc, ESP_TCL, size); + ESP_WRITE_REG(sc, ESP_TCM, size >> 8); + if (sc->sc_cfg2 & ESPCFG2_FE) { + ESP_WRITE_REG(sc, ESP_TCH, size >> 16); + } + /* load the count in */ + ESPCMD(sc, ESPCMD_NOP|ESPCMD_DMA); + ESPCMD(sc, (size==0?ESPCMD_TRPAD:ESPCMD_TRANS)|ESPCMD_DMA); + DMA_GO(sc->sc_dma); +#else + { int i; + ESPCMD(sc, ESPCMD_FLUSH); + for (i = 0; i < sc->sc_omlen; i++) + ESP_WRITE_REG(sc, FIFO, sc->sc_omess[i]); + ESPCMD(sc, ESPCMD_TRANS); +#if test_stuck_on_msgout +printf("<<XXXmsgoutdoneXXX>>"); +#endif + } +#endif +} + +/* + * This is the most critical part of the driver, and has to know + * how to deal with *all* error conditions and phases from the SCSI + * bus. If there are no errors and the DMA was active, then call the + * DMA pseudo-interrupt handler. If this returns 1, then that was it + * and we can return from here without further processing. + * + * Most of this needs verifying. + */ +int +espintr(sc) + register struct esp_softc *sc; +{ + register struct ecb *ecb; + register struct scsi_link *sc_link; + struct esp_tinfo *ti; + int loop; + size_t size; + + ESP_TRACE(("[espintr]")); + + /* + * I have made some (maybe seriously flawed) assumptions here, + * but basic testing (uncomment the printf() below), show that + * certainly something happens when this loop is here. + * + * The idea is that many of the SCSI operations take very little + * time, and going away and getting interrupted is too high an + * overhead to pay. For example, selecting, sending a message + * and command and then doing some work can be done in one "pass". + * + * The DELAY is not variable because I do not understand that the + * DELAY loop should be fixed-time regardless of CPU speed, but + * I am *assuming* that the faster SCSI processors get things done + * quicker (sending a command byte etc), and so there is no + * need to be too slow. + * + * This is a heuristic. It is 2 when at 20Mhz, 2 at 25Mhz and 1 + * at 40Mhz. This needs testing. + */ + for (loop = 0; 1;loop++, DELAY(50/sc->sc_freq)) { + /* a feeling of deja-vu */ + if (!DMA_ISINTR(sc->sc_dma)) + return (loop != 0); +#if 0 + if (loop) + printf("*"); +#endif + + /* and what do the registers say... */ + espreadregs(sc); + + sc->sc_intrcnt.ev_count++; + + /* + * At the moment, only a SCSI Bus Reset or Illegal + * Command are classed as errors. A disconnect is a + * valid condition, and we let the code check is the + * "ESP_BUSFREE_OK" flag was set before declaring it + * and error. + * + * Also, the status register tells us about "Gross + * Errors" and "Parity errors". Only the Gross Error + * is really bad, and the parity errors are dealt + * with later + * + * TODO + * If there are too many parity error, go to slow + * cable mode ? + */ + + /* SCSI Reset */ + if (sc->sc_espintr & ESPINTR_SBR) { + if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) { + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + } + if (sc->sc_state != ESP_SBR) { + printf("%s: SCSI bus reset\n", + sc->sc_dev.dv_xname); + esp_init(sc, 0); /* Restart everything */ + return 1; + } +#if 0 + /*XXX*/ printf("<expected bus reset: " + "[intr %x, stat %x, step %d]>\n", + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); +#endif + if (sc->sc_nexus) + panic("%s: nexus in reset state", + sc->sc_dev.dv_xname); + sc->sc_state = ESP_IDLE; + esp_sched(sc); + return 1; + } + + ecb = sc->sc_nexus; + +#define ESPINTR_ERR (ESPINTR_SBR|ESPINTR_ILL) + if (sc->sc_espintr & ESPINTR_ERR || + sc->sc_espstat & ESPSTAT_GE) { + + if (sc->sc_espstat & ESPSTAT_GE) { + /* no target ? */ + if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) { + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + } + if (sc->sc_state == ESP_HASNEXUS || + sc->sc_state == ESP_SELECTING) { + ecb->xs->error = XS_DRIVER_STUFFUP; + esp_done(ecb); + } + return 1; + } + + if (sc->sc_espintr & ESPINTR_ILL) { + /* illegal command, out of sync ? */ + printf("%s: illegal command: 0x%x (state %d, phase %x, prevphase %x)\n", + sc->sc_dev.dv_xname, sc->sc_lastcmd, + sc->sc_state, sc->sc_phase, + sc->sc_prevphase); + if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) { + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + } + esp_init(sc, 0); /* Restart everything */ + return 1; + } + } + + /* + * Call if DMA is active. + * + * If DMA_INTR returns true, then maybe go 'round the loop + * again in case there is no more DMA queued, but a phase + * change is expected. + */ + if (DMA_ISACTIVE(sc->sc_dma)) { + DMA_INTR(sc->sc_dma); + /* If DMA active here, then go back to work... */ + if (DMA_ISACTIVE(sc->sc_dma)) + return 1; + + if (sc->sc_dleft == 0 && + (sc->sc_espstat & ESPSTAT_TC) == 0) + printf("%s: !TC [intr %x, stat %x, step %d]" + " prevphase %x, resid %x\n", + sc->sc_dev.dv_xname, + sc->sc_espintr, + sc->sc_espstat, + sc->sc_espstep, + sc->sc_prevphase, + ecb?ecb->dleft:-1); + } + +#if 0 /* Unreliable on some ESP revisions? */ + if ((sc->sc_espstat & ESPSTAT_INT) == 0) { + printf("%s: spurious interrupt\n", sc->sc_dev.dv_xname); + return 1; + } +#endif + + /* + * check for less serious errors + */ + if (sc->sc_espstat & ESPSTAT_PE) { + printf("%s: SCSI bus parity error\n", + sc->sc_dev.dv_xname); + if (sc->sc_prevphase == MESSAGE_IN_PHASE) + esp_sched_msgout(SEND_PARITY_ERROR); + else + esp_sched_msgout(SEND_INIT_DET_ERR); + } + + if (sc->sc_espintr & ESPINTR_DIS) { + ESP_MISC(("<DISC [intr %x, stat %x, step %d]>", + sc->sc_espintr,sc->sc_espstat,sc->sc_espstep)); + if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) { + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + } + /* + * This command must (apparently) be issued within + * 250mS of a disconnect. So here you are... + */ + ESPCMD(sc, ESPCMD_ENSEL); + if (sc->sc_state != ESP_IDLE) { + if ((sc->sc_flags & ESP_SYNCHNEGO)) { +#ifdef ESP_DEBUG + if (ecb) + sc_print_addr(ecb->xs->sc_link); + printf("sync nego not completed!\n"); +#endif + sc->sc_flags &= ~ESP_SYNCHNEGO; + sc->sc_tinfo[ecb->xs->sc_link->target].offset = 0; + sc->sc_tinfo[ecb->xs->sc_link->target].flags &= ~T_NEGOTIATE; + } + /*XXX*/sc->sc_msgpriq = sc->sc_msgout = 0; + + /* it may be OK to disconnect */ + if (!(sc->sc_flags & ESP_BUSFREE_OK)) { + if (sc->sc_state == ESP_HASNEXUS) { + sc_print_addr(ecb->xs->sc_link); + printf("disconnect without" + "warning\n"); + } + ecb->xs->error = XS_TIMEOUT; + } else if (sc->sc_flags & ESP_DISCON) { + TAILQ_INSERT_HEAD(&sc->nexus_list, ecb, chain); + ECB_SETQ(ecb, ECB_QNEXUS); + sc->sc_nexus = NULL; + sc->sc_flags &= ~ESP_DISCON; + sc->sc_state = ESP_IDLE; +#if ESP_DEBUG +if ((esp_debug & 0x10000) && ecb->dleft == 0) { + printf("%s: silly disconnect (ecb %p [stat %x])\n", + sc->sc_dev.dv_xname, ecb, ecb->stat); +} +#endif + esp_sched(sc); + return 1; + } + + esp_done(ecb); + return 1; + } + printf("%s: DISCONNECT in IDLE state!\n", + sc->sc_dev.dv_xname); + } + + /* did a message go out OK ? This must be broken */ + if (sc->sc_prevphase == MESSAGE_OUT_PHASE && + sc->sc_phase != MESSAGE_OUT_PHASE) { + /* we have sent it */ + if (sc->sc_msgout == SEND_SDTR && + (sc->sc_flags & ESP_SYNCHNEGO) == 0) { + /* We've just accepted new sync parameters */ + sc->sc_tinfo[ecb->xs->sc_link->target].flags |= + T_SYNCMODE; +if (ecb) sc_print_addr(ecb->xs->sc_link);else printf("NO nexus: "); +printf("target put in SYNC mode\n"); + } + sc->sc_msgpriq &= ~sc->sc_msgout; + sc->sc_msgout = 0; + } + + switch (sc->sc_state) { + + case ESP_SBR: + printf("%s: waiting for SCSI Bus Reset to happen\n", + sc->sc_dev.dv_xname); + return 1; + + case ESP_RESELECTED: + /* + * we must be continuing a message ? + */ + if (sc->sc_phase != MESSAGE_IN_PHASE) { + printf("%s: target didn't identify\n", + sc->sc_dev.dv_xname); + esp_init(sc, 1); + return 1; + } +printf("<<RESELECT CONT'd>>"); +#if XXXX + esp_msgin(sc); + if (sc->sc_state != ESP_HASNEXUS) { + /* IDENTIFY fail?! */ + printf("%s: identify failed\n", + sc->sc_dev.dv_xname); + esp_init(sc, 1); + return 1; + } +#endif + break; + + case ESP_IDLE: +if (sc->sc_flags & ESP_ICCS) printf("[[esp: BUMMER]]"); + case ESP_SELECTING: + + if (sc->sc_espintr & ESPINTR_RESEL) { + /* + * If we're trying to select a + * target ourselves, push our command + * back into the ready list. + */ + if (sc->sc_state == ESP_SELECTING) { + ESP_MISC(("backoff selector ")); + sc_link = sc->sc_nexus->xs->sc_link; + ti = &sc->sc_tinfo[sc_link->target]; + TAILQ_INSERT_HEAD(&sc->ready_list, + sc->sc_nexus, chain); + ECB_SETQ(sc->sc_nexus, ECB_QREADY); + ti->lubusy &= ~(1<<sc_link->lun); + ecb = sc->sc_nexus = NULL; + } + sc->sc_state = ESP_RESELECTED; + if (sc->sc_phase != MESSAGE_IN_PHASE) { + /* + * Things are seriously fucked up. + * Pull the brakes, i.e. reset + */ + printf("%s: target didn't identify\n", + sc->sc_dev.dv_xname); + esp_init(sc, 1); + return 1; + } + if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) != 2) { + printf("%s: RESELECT: %d bytes in FIFO!\n", + sc->sc_dev.dv_xname, + ESP_READ_REG(sc, ESP_FFLAG) & + ESPFIFO_FF); + esp_init(sc, 1); + return 1; + } + sc->sc_selid = ESP_READ_REG(sc, ESP_FIFO); + sc->sc_selid &= ~(1<<sc->sc_id); + ESP_MISC(("selid=0x%2x ", sc->sc_selid)); + esp_msgin(sc); /* Handle identify message */ + if (sc->sc_state != ESP_HASNEXUS) { + /* IDENTIFY fail?! */ + printf("%s: identify failed\n", + sc->sc_dev.dv_xname); + esp_init(sc, 1); + return 1; + } + continue; /* ie. next phase expected soon */ + } + +#define ESPINTR_DONE (ESPINTR_FC|ESPINTR_BS) + if ((sc->sc_espintr & ESPINTR_DONE) == ESPINTR_DONE) { + ecb = sc->sc_nexus; + if (!ecb) + panic("esp: not nexus at sc->sc_nexus"); + + sc_link = ecb->xs->sc_link; + ti = &sc->sc_tinfo[sc_link->target]; + + switch (sc->sc_espstep) { + case 0: + printf("%s: select timeout/no disconnect\n", + sc->sc_dev.dv_xname); + esp_abort(sc, ecb); + return 1; + case 1: + if ((ti->flags & T_NEGOTIATE) == 0) { + printf("%s: step 1 & !NEG\n", + sc->sc_dev.dv_xname); + esp_abort(sc, ecb); + return 1; + } + if (sc->sc_phase != MESSAGE_OUT_PHASE) { + printf("%s: !MSGOUT\n", + sc->sc_dev.dv_xname); + esp_abort(sc, ecb); + return 1; + } + /* Start negotiating */ + ti->period = sc->sc_minsync; + ti->offset = 15; + sc->sc_msgpriq = SEND_SDTR; + sc->sc_flags |= ESP_SYNCHNEGO; + break; + case 3: + /* + * Grr, this is supposed to mean + * "target left command phase + * prematurely". It seems to happen + * regularly when sync mode is on. + * Look at FIFO to see if command + * went out. + * (Timing problems?) + */ + if ((ESP_READ_REG(sc, ESP_FFLAG)&ESPFIFO_FF) == 0) { + /* Hope for the best.. */ + break; + } + printf("(%s:%d:%d): selection failed;" + " %d left in FIFO " + "[intr %x, stat %x, step %d]\n", + sc->sc_dev.dv_xname, + sc_link->target, + sc_link->lun, + ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + ESPCMD(sc, ESPCMD_FLUSH); + sc->sc_flags |= ESP_ABORTING; + esp_sched_msgout(SEND_ABORT); + return 1; + case 2: + /* Select stuck at Command Phase */ + ESPCMD(sc, ESPCMD_FLUSH); + case 4: + /* So far, everything went fine */ + sc->sc_msgpriq = 0; + break; + } +#if 0 +/* Why set msgpriq? (and not raise ATN) */ + if (ecb->xs->flags & SCSI_RESET) + sc->sc_msgpriq = SEND_DEV_RESET; + else if (ti->flags & T_NEGOTIATE) + sc->sc_msgpriq = + SEND_IDENTIFY | SEND_SDTR; + else + sc->sc_msgpriq = SEND_IDENTIFY; +#endif + sc->sc_state = ESP_HASNEXUS; + /*???sc->sc_flags = 0; */ + sc->sc_prevphase = INVALID_PHASE; /* ?? */ + sc->sc_dp = ecb->daddr; + sc->sc_dleft = ecb->dleft; + ti->lubusy |= (1<<sc_link->lun); + break; + } else { + printf("%s: unexpected status after select" + ": [intr %x, stat %x, step %x]\n", + sc->sc_dev.dv_xname, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + esp_abort(sc, ecb); + } + if (sc->sc_state == ESP_IDLE) { + printf("%s: stray interrupt\n", sc->sc_dev.dv_xname); + return 0; + } + break; + + case ESP_HASNEXUS: + if (sc->sc_flags & ESP_ICCS) { + unsigned char msg; + + sc->sc_flags &= ~ESP_ICCS; + + if (!(sc->sc_espintr & ESPINTR_DONE)) { + printf("%s: ICCS: " + ": [intr %x, stat %x, step %x]\n", + sc->sc_dev.dv_xname, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + } + if ((ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) != 2) { + printf("%s: ICCS: expected 2, got %d " + ": [intr %x, stat %x, step %x]\n", + sc->sc_dev.dv_xname, + ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + ESPCMD(sc, ESPCMD_FLUSH); + esp_abort(sc, ecb); + return 1; + } + ecb->stat = ESP_READ_REG(sc, ESP_FIFO); + msg = ESP_READ_REG(sc, ESP_FIFO); + ESP_PHASE(("<stat:(%x,%x)>", ecb->stat, msg)); + if (msg == MSG_CMDCOMPLETE) { + sc->sc_flags |= ESP_BUSFREE_OK; + ecb->xs->resid = ecb->dleft = sc->sc_dleft; + } else + printf("%s: STATUS_PHASE: msg %d\n", + sc->sc_dev.dv_xname, msg); + ESPCMD(sc, ESPCMD_MSGOK); + continue; /* ie. wait for disconnect */ + } + break; + default: + panic("%s: invalid state: %d", + sc->sc_dev.dv_xname, + sc->sc_state); + } + + /* + * Driver is now in state ESP_HASNEXUS, i.e. we + * have a current command working the SCSI bus. + */ + if (sc->sc_state != ESP_HASNEXUS || ecb == NULL) { + panic("esp no nexus"); + } + + switch (sc->sc_phase) { + case MESSAGE_OUT_PHASE: + ESP_PHASE(("MESSAGE_OUT_PHASE ")); + esp_msgout(sc); + sc->sc_prevphase = MESSAGE_OUT_PHASE; + break; + case MESSAGE_IN_PHASE: + ESP_PHASE(("MESSAGE_IN_PHASE ")); + if (sc->sc_espintr & ESPINTR_BS) { + ESPCMD(sc, ESPCMD_FLUSH); + sc->sc_flags |= ESP_WAITI; + ESPCMD(sc, ESPCMD_TRANS); + } else if (sc->sc_espintr & ESPINTR_FC) { + if ((sc->sc_flags & ESP_WAITI) == 0) { + printf("%s: MSGIN: unexpected FC bit: " + "[intr %x, stat %x, step %x]\n", + sc->sc_dev.dv_xname, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + } + sc->sc_flags &= ~ESP_WAITI; + esp_msgin(sc); + } else { + printf("%s: MSGIN: weird bits: " + "[intr %x, stat %x, step %x]\n", + sc->sc_dev.dv_xname, + sc->sc_espintr, sc->sc_espstat, + sc->sc_espstep); + } + sc->sc_prevphase = MESSAGE_IN_PHASE; + break; + case COMMAND_PHASE: { + /* well, this means send the command again */ + u_char *cmd = (u_char *)&ecb->cmd; + int i; + + ESP_PHASE(("COMMAND_PHASE 0x%02x (%d) ", + ecb->cmd.opcode, ecb->clen)); + if (ESP_READ_REG(sc, ESP_FFLAG) & ESPFIFO_FF) { + ESPCMD(sc, ESPCMD_FLUSH); + DELAY(1); + } + /* Now the command into the FIFO */ + for (i = 0; i < ecb->clen; i++) + ESP_WRITE_REG(sc, ESP_FIFO, *cmd++); + ESPCMD(sc, ESPCMD_TRANS); + sc->sc_prevphase = COMMAND_PHASE; + } + break; + case DATA_OUT_PHASE: + ESP_PHASE(("DATA_OUT_PHASE [%d] ", sc->sc_dleft)); + ESPCMD(sc, ESPCMD_FLUSH); + size = min(sc->sc_dleft, sc->sc_maxxfer); + DMA_SETUP(sc->sc_dma, &sc->sc_dp, &sc->sc_dleft, + 0, &size); + sc->sc_prevphase = DATA_OUT_PHASE; + goto setup_xfer; + case DATA_IN_PHASE: + ESP_PHASE(("DATA_IN_PHASE ")); + if (sc->sc_rev == ESP100) + ESPCMD(sc, ESPCMD_FLUSH); + size = min(sc->sc_dleft, sc->sc_maxxfer); + DMA_SETUP(sc->sc_dma, &sc->sc_dp, &sc->sc_dleft, + 1, &size); + sc->sc_prevphase = DATA_IN_PHASE; + setup_xfer: + /* Program the SCSI counter */ + ESP_WRITE_REG(sc, ESP_TCL, size); + ESP_WRITE_REG(sc, ESP_TCM, size >> 8); + if (sc->sc_cfg2 & ESPCFG2_FE) { + ESP_WRITE_REG(sc, ESP_TCH, size >> 16); + } + /* load the count in */ + ESPCMD(sc, ESPCMD_NOP|ESPCMD_DMA); + + /* + * Note that if `size' is 0, we've already transceived + * all the bytes we want but we're still in DATA PHASE. + * Apparently, the device needs padding. Also, a + * transfer size of 0 means "maximum" to the chip + * DMA logic. + */ + ESPCMD(sc, + (size==0?ESPCMD_TRPAD:ESPCMD_TRANS)|ESPCMD_DMA); + DMA_GO(sc->sc_dma); + return 1; + case STATUS_PHASE: + ESP_PHASE(("STATUS_PHASE ")); + sc->sc_flags |= ESP_ICCS; + ESPCMD(sc, ESPCMD_ICCS); + sc->sc_prevphase = STATUS_PHASE; + break; + case INVALID_PHASE: + break; + case BUSFREE_PHASE: + if (sc->sc_flags & ESP_BUSFREE_OK) { + /*It's fun the 1st time.. */ + sc->sc_flags &= ~ESP_BUSFREE_OK; + } + break; + default: + panic("esp: bogus bus phase\n"); + } + } + panic("esp: should not get here.."); +} + +void +esp_abort(sc, ecb) + struct esp_softc *sc; + struct ecb *ecb; +{ + if (ecb == sc->sc_nexus) { + if (sc->sc_state == ESP_HASNEXUS) { + sc->sc_flags |= ESP_ABORTING; + esp_sched_msgout(SEND_ABORT); + } + } else { + if (sc->sc_state == ESP_IDLE) + esp_sched(sc); + } +} + +void +esp_timeout(arg) + void *arg; +{ + int s = splbio(); + struct ecb *ecb = (struct ecb *)arg; + struct esp_softc *sc; + struct scsi_xfer *xs = ecb->xs; + + sc = xs->sc_link->adapter_softc; + sc_print_addr(xs->sc_link); +again: + printf("%s: timed out [ecb %p (flags 0x%x, dleft %x, stat %x)], " + "<state %d, nexus %p, phase(c %x, p %x), resid %x, msg(q %x,o %x) %s>", + sc->sc_dev.dv_xname, + ecb, ecb->flags, ecb->dleft, ecb->stat, + sc->sc_state, sc->sc_nexus, sc->sc_phase, sc->sc_prevphase, + sc->sc_dleft, sc->sc_msgpriq, sc->sc_msgout, + DMA_ISACTIVE(sc->sc_dma) ? "DMA active" : ""); +#if ESP_DEBUG > 0 + printf("TRACE: %s.", ecb->trace); +#endif + + if (ecb->flags & ECB_ABORTED) { + /* abort timed out */ + printf(" AGAIN\n"); + esp_init(sc, 1); + } else { + /* abort the operation that has timed out */ + printf("\n"); + xs->error = XS_TIMEOUT; + ecb->flags |= ECB_ABORTED; + esp_abort(sc, ecb); + /* 2 secs for the abort */ + if ((xs->flags & SCSI_NOMASK) == 0) + timeout(esp_timeout, ecb, 2 * hz); + else { + int count = 200000; + while (count) { + if (DMA_ISINTR(sc->sc_dma)) { + espintr(sc); + } + if (xs->flags & ITSDONE) + break; + DELAY(10); + --count; + } + if (count == 0) + goto again; + } + } + splx(s); +} + +static void +esp_min_phys (struct buf *bp) +{ + +} |
