ata_wdc.c

MIPS处理器的bootloader,龙芯就是用的修改过的PMON2

		printf("%s:%d:%d: bad state %d in wdc_ata_bio_intr\n",
		    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
		    drvp->state);
		panic("wdc_ata_bio_intr: bad state\n");
	}

#ifndef PMON
	if (xfer->c_flags & C_DMA) {
		dma_flags = (ata_bio->flags & ATA_READ) ?  WDC_DMA_READ : 0;
		dma_flags |= (ata_bio->flags & ATA_POLL) ?  WDC_DMA_POLL : 0;
	}
#endif

	/*
	 * if we missed an interrupt in a PIO transfer, reset and restart.
	 * Don't try to continue transfer, we may have missed cycles.
	 */
	if ((xfer->c_flags & (C_TIMEOU | C_DMA)) == C_TIMEOU) {
		ata_bio->error = TIMEOUT;
		wdc_ata_bio_done(chp, xfer);
		return 1;
	}

	/* Ack interrupt done by wait_for_unbusy */
	if (wait_for_unbusy(chp,
	    (irq == 0) ? ATA_DELAY : 0) < 0) {
		if (irq && (xfer->c_flags & C_TIMEOU) == 0)
			return 0; /* IRQ was not for us */
		printf("%s:%d:%d: device timeout, c_bcount=%d, c_skip%d\n",
		    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
		    xfer->c_bcount, xfer->c_skip);
#ifndef PMON
		/* if we were using DMA, turn off DMA channel */
		if (xfer->c_flags & C_DMA) {
			(*chp->wdc->dma_finish)(chp->wdc->dma_arg,
			    chp->channel, xfer->drive, dma_flags);
			drvp->n_dmaerrs++;
		}
#endif
		ata_bio->error = TIMEOUT;
		wdc_ata_bio_done(chp, xfer);
		return 1;
	}
	
	drv_err = wdc_ata_err(drvp, ata_bio);

#ifndef PMON
	/* If we were using DMA, Turn off the DMA channel and check for error */
	if (xfer->c_flags & C_DMA) {
		if (ata_bio->flags & ATA_POLL) {
			/*
			 * IDE drives deassert WDCS_BSY before transfer is
			 * complete when using DMA. Polling for DRQ to deassert
			 * is not enouth DRQ is not required to be
			 * asserted for DMA transfers, so poll for DRDY.
			 */
			if (wdcwait(chp, WDCS_DRDY | WDCS_DRQ, WDCS_DRDY,
			    ATA_DELAY) < 0) {
				printf("%s:%d:%d: polled transfer timed out "
				    "(st=0x%x)\n", chp->wdc->sc_dev.dv_xname,
				    chp->channel, xfer->drive, chp->ch_status);
				ata_bio->error = TIMEOUT;
				drv_err = WDC_ATA_ERR;
			}
		}
		if ((*chp->wdc->dma_finish)(chp->wdc->dma_arg,
		    chp->channel, xfer->drive, dma_flags) != 0) {
			if (drv_err != WDC_ATA_ERR) {
				ata_bio->error = ERR_DMA;
				drv_err = WDC_ATA_ERR;
			}
		}
		if (chp->ch_status & WDCS_DRQ) {
			if (drv_err != WDC_ATA_ERR) {
				printf("%s:%d:%d: intr with DRQ (st=0x%x)\n",
				    chp->wdc->sc_dev.dv_xname, chp->channel,
				    xfer->drive, chp->ch_status);
				ata_bio->error = TIMEOUT;
				drv_err = WDC_ATA_ERR;
			}
		}
		if (drv_err != WDC_ATA_ERR)
			goto end;
		drvp->n_dmaerrs++;
	}
#endif

	/* if we had an error, end */
	if (drv_err == WDC_ATA_ERR) {
		wdc_ata_bio_done(chp, xfer);
		return 1;
	}

	/* If this was a read and not using DMA, fetch the data. */
	if ((ata_bio->flags & ATA_READ) != 0) {
		if ((chp->ch_status & WDCS_DRQ) != WDCS_DRQ) {
			printf("%s:%d:%d: read intr before drq\n",
			    chp->wdc->sc_dev.dv_xname, chp->channel,
			    xfer->drive);
			ata_bio->error = TIMEOUT;
			wdc_ata_bio_done(chp, xfer);
			return 1;
		}
		wdc_input_bytes(drvp, (char *)xfer->databuf + xfer->c_skip,
		    ata_bio->nbytes);
	}
#ifndef PMON
end:
#endif
	ata_bio->blkno += ata_bio->nblks;
	ata_bio->blkdone += ata_bio->nblks;
	xfer->c_skip += ata_bio->nbytes;
	xfer->c_bcount -= ata_bio->nbytes;
	/* See if this transfer is complete. */
	if (xfer->c_bcount > 0) {
		if ((ata_bio->flags & ATA_POLL) == 0) {
			/* Start the next operation */
			_wdc_ata_bio_start(chp, xfer);
		} else {
			/* Let _wdc_ata_bio_start do the loop */
			return 1;
		}
	} else { /* Done with this transfer */
		ata_bio->error = NOERROR;
		wdc_ata_bio_done(chp, xfer);
	}
	return 1;
}


void
wdc_ata_bio_kill_xfer(chp, xfer)
	struct channel_softc *chp;
	struct wdc_xfer *xfer;
{
	struct ata_bio *ata_bio = xfer->cmd;

#ifndef PMON
	untimeout(wdctimeout, chp);
#endif
	/* remove this command from xfer queue */
	wdc_free_xfer(chp, xfer);

	ata_bio->flags |= ATA_ITSDONE;
	ata_bio->error = ERR_NODEV;
	ata_bio->r_error = WDCE_ABRT;
	if ((ata_bio->flags & ATA_POLL) == 0) {
		WDCDEBUG_PRINT(("wdc_ata_done: wddone\n"), DEBUG_XFERS);
		wddone(ata_bio->wd);
	}
}

void
wdc_ata_bio_done(chp, xfer)
	struct channel_softc *chp;
	struct wdc_xfer *xfer;
{
	struct ata_bio *ata_bio = xfer->cmd;
	int drive = xfer->drive;
	struct ata_drive_datas *drvp = &chp->ch_drive[drive];

	WDCDEBUG_PRINT(("wdc_ata_bio_done %s:%d:%d: flags 0x%x\n",
	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive, 
	    (u_int)xfer->c_flags),
	    DEBUG_XFERS);

#ifndef PMON
	untimeout(wdctimeout, chp);
#endif
	if (ata_bio->error == NOERROR)
		drvp->n_dmaerrs = 0;
	else if (drvp->n_dmaerrs >= NERRS_MAX) {
		wdc_downgrade_mode(drvp);
	}

	/* feed back residual bcount to our caller */
	ata_bio->bcount = xfer->c_bcount;

	/* remove this command from xfer queue */
	wdc_free_xfer(chp, xfer);

	ata_bio->flags |= ATA_ITSDONE;
	if ((ata_bio->flags & ATA_POLL) == 0) {
		WDCDEBUG_PRINT(("wdc_ata_done: wddone\n"), DEBUG_XFERS);
		wddone(ata_bio->wd);
	}
	WDCDEBUG_PRINT(("wdcstart from wdc_ata_done, flags 0x%x\n",
	    chp->ch_flags), DEBUG_XFERS);
	wdcstart(chp);
}

/*
 * Implement operations needed before read/write.
 */
int
wdc_ata_ctrl_intr(chp, xfer, irq)
	struct channel_softc *chp;
	struct wdc_xfer *xfer;
	int irq;
{
	struct ata_bio *ata_bio = xfer->cmd;
	struct ata_drive_datas *drvp = &chp->ch_drive[xfer->drive];
	char *errstring = NULL;
	int delay = (irq == 0) ? ATA_DELAY : 0;

	WDCDEBUG_PRINT(("wdc_ata_ctrl_intr: state %d\n", drvp->state),
	    DEBUG_FUNCS);

again:
	switch (drvp->state) {
	case RECAL:    /* Should not be in this state here */
		panic("wdc_ata_ctrl_intr: state==RECAL");
		break;

	case RECAL_WAIT:
		errstring = "recal";
		if (wdcwait(chp, WDCS_DRDY, WDCS_DRDY, delay))
			goto timeout;
		if (chp->ch_status & (WDCS_ERR | WDCS_DWF))
			goto error;
	/* fall through */

	case PIOMODE:
		/* Don't try to set modes if controller can't be adjusted */
		if ((chp->wdc->cap & WDC_CAPABILITY_MODE) == 0)
			goto geometry;
		/* Also don't try if the drive didn't report its mode */
		if ((drvp->drive_flags & DRIVE_MODE) == 0)
			goto geometry;
		wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
		    0x08 | drvp->PIO_mode, WDSF_SET_MODE);
		drvp->state = PIOMODE_WAIT;
		break;

	case PIOMODE_WAIT:
		errstring = "piomode";
		if (wdcwait(chp, WDCS_DRDY, WDCS_DRDY, delay))
			goto timeout;
		if (chp->ch_status & (WDCS_ERR | WDCS_DWF))
			goto error;
	/* fall through */

	case DMAMODE:
		if (drvp->drive_flags & DRIVE_UDMA) {
			wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
			    0x40 | drvp->UDMA_mode, WDSF_SET_MODE);
		} else if (drvp->drive_flags & DRIVE_DMA) {
			wdccommand(chp, drvp->drive, SET_FEATURES, 0, 0, 0,
			    0x20 | drvp->DMA_mode, WDSF_SET_MODE);
		} else {
			goto geometry;
		}	
		drvp->state = DMAMODE_WAIT;
		break;
	case DMAMODE_WAIT:
		errstring = "dmamode";
		if (wdcwait(chp, WDCS_DRDY, WDCS_DRDY, delay))
			goto timeout;
		if (chp->ch_status & (WDCS_ERR | WDCS_DWF))
			goto error;
	/* fall through */

	case GEOMETRY:
	geometry:
		if (ata_bio->flags & ATA_LBA)
			goto multimode;
		wdccommand(chp, xfer->drive, WDCC_IDP,
		    ata_bio->lp->d_ncylinders,
		    ata_bio->lp->d_ntracks - 1, 0, ata_bio->lp->d_nsectors,
		    (ata_bio->lp->d_type == DTYPE_ST506) ?
			ata_bio->lp->d_precompcyl / 4 : 0);
		drvp->state = GEOMETRY_WAIT;
		break;

	case GEOMETRY_WAIT:
		errstring = "geometry";
		if (wdcwait(chp, WDCS_DRDY, WDCS_DRDY, delay))
			goto timeout;
		if (chp->ch_status & (WDCS_ERR | WDCS_DWF))
			goto error;
		/* fall through */

	case MULTIMODE:
	multimode:
		if (ata_bio->multi == 1)
			goto ready;
		wdccommand(chp, xfer->drive, WDCC_SETMULTI, 0, 0, 0,
		    ata_bio->multi, 0);
		drvp->state = MULTIMODE_WAIT;
		break;

	case MULTIMODE_WAIT:
		errstring = "setmulti";
		if (wdcwait(chp, WDCS_DRDY, WDCS_DRDY, delay))
			goto timeout;
		if (chp->ch_status & (WDCS_ERR | WDCS_DWF))
			goto error;
		/* fall through */

	case READY:
	ready:
		drvp->state = READY;
		/*
		 * The drive is usable now
		 */
		xfer->c_intr = wdc_ata_bio_intr;
		_wdc_ata_bio_start(chp, xfer); 
		return 1;
	}

	if ((ata_bio->flags & ATA_POLL) == 0) {
		chp->ch_flags |= WDCF_IRQ_WAIT;
	} else {
		goto again;
	}
	return 1;

timeout:
	if (irq && (xfer->c_flags & C_TIMEOU) == 0) {
		return 0; /* IRQ was not for us */
	}
	printf("%s:%d:%d: %s timed out\n",
	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive, errstring);
	ata_bio->error = TIMEOUT;
	drvp->state = 0;
	wdc_ata_bio_done(chp, xfer);
	return 0;
error:
	printf("%s:%d:%d: %s ",
	    chp->wdc->sc_dev.dv_xname, chp->channel, xfer->drive,
	    errstring);
	if (chp->ch_status & WDCS_DWF) {
		printf("drive fault\n");
		ata_bio->error = ERR_DF;
	} else {
		printf("error (%x)\n", chp->ch_error);
		ata_bio->r_error = chp->ch_error;
		ata_bio->error = ERROR;
	}
	drvp->state = 0;
	wdc_ata_bio_done(chp, xfer);
	return 1;
}

int
wdc_ata_err(drvp, ata_bio)
	struct ata_drive_datas *drvp;
	struct ata_bio *ata_bio;
{
	struct channel_softc *chp = drvp->chnl_softc;
	ata_bio->error = 0;
	if (chp->ch_status & WDCS_BSY) {
		ata_bio->error = TIMEOUT;
		return WDC_ATA_ERR;
	}

	if (chp->ch_status & WDCS_DWF) {
		ata_bio->error = ERR_DF;
		return WDC_ATA_ERR;
	}

	if (chp->ch_status & WDCS_ERR) {
		ata_bio->error = ERROR;
		ata_bio->r_error = chp->ch_error;
		if (drvp->drive_flags & DRIVE_UDMA &&
		    (ata_bio->r_error & WDCE_CRC)) {
			/*
			 * Record the CRC error, to avoid downgrading to
			 * multiword DMA
			 */
			drvp->drive_flags |= DRIVE_DMAERR;
		}
		if (ata_bio->r_error & (WDCE_BBK | WDCE_UNC | WDCE_IDNF |
		    WDCE_ABRT | WDCE_TK0NF | WDCE_AMNF))
			return WDC_ATA_ERR;
		return WDC_ATA_NOERR;
	}

	if (chp->ch_status & WDCS_CORR)
		ata_bio->flags |= ATA_CORR;
	return WDC_ATA_NOERR;
}

#if 0
int
wdc_ata_addref(drvp)
	struct ata_drive_datas *drvp;
{
	struct channel_softc *chp = drvp->chnl_softc;

	return (wdc_addref(chp));
}

void
wdc_ata_delref(drvp)
	struct ata_drive_datas *drvp;
{
	struct channel_softc *chp = drvp->chnl_softc;

	wdc_delref(chp);
}
#endif