/* $NetBSD: si.c,v 1.64 2020/11/21 00:27:52 thorpej Exp $ */ /*- * Copyright (c) 1996 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Adam Glass, David Jones, and Gordon W. Ross. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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. */ /* * This file contains only the machine-dependent parts of the * Sun3 SCSI driver. (Autoconfig stuff and DMA functions.) * The machine-independent parts are in ncr5380sbc.c * * Supported hardware includes: * Sun SCSI-3 on OBIO (Sun3/50,Sun3/60) * Sun SCSI-3 on VME (Sun3/160,Sun3/260) * * Could be made to support the Sun3/E if someone wanted to. * * Note: Both supported variants of the Sun SCSI-3 adapter have * some really unusual "features" for this driver to deal with, * generally related to the DMA engine. The OBIO variant will * ignore any attempt to write the FIFO count register while the * SCSI bus is in DATA_IN or DATA_OUT phase. This is dealt with * by setting the FIFO count early in COMMAND or MSG_IN phase. * * The VME variant has a bit to enable or disable the DMA engine, * but that bit also gates the interrupt line from the NCR5380! * Therefore, in order to get any interrupt from the 5380, (i.e. * for reselect) one must clear the DMA engine transfer count and * then enable DMA. This has the further complication that you * CAN NOT touch the NCR5380 while the DMA enable bit is set, so * we have to turn DMA back off before we even look at the 5380. * * What wonderfully whacky hardware this is! * * Credits, history: * * David Jones wrote the initial version of this module, which * included support for the VME adapter only. (no reselection). * * Gordon Ross added support for the OBIO adapter, and re-worked * both the VME and OBIO code to support disconnect/reselect. * (Required figuring out the hardware "features" noted above.) * * The autoconfiguration boilerplate came from Adam Glass. */ #include __KERNEL_RCSID(0, "$NetBSD: si.c,v 1.64 2020/11/21 00:27:52 thorpej Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* #define DEBUG XXX */ #include #include #include "sireg.h" #include "sivar.h" /* * Transfers smaller than this are done using PIO * (on assumption they're not worth DMA overhead) */ #define MIN_DMA_LEN 128 int si_debug = 0; #ifdef DEBUG #endif /* How long to wait for DMA before declaring an error. */ int si_dma_intr_timo = 500; /* ticks (sec. X 100) */ static void si_minphys(struct buf *); /* * New-style autoconfig attachment. The cfattach * structures are in si_obio.c and si_vme.c */ void si_attach(struct si_softc *sc) { struct ncr5380_softc *ncr_sc = &sc->ncr_sc; volatile struct si_regs *regs = sc->sc_regs; int i; /* * Support the "options" (config file flags). * Disconnect/reselect is a per-target mask. * Interrupts and DMA are per-controller. */ ncr_sc->sc_no_disconnect = (sc->sc_options & SI_NO_DISCONNECT); ncr_sc->sc_parity_disable = (sc->sc_options & SI_NO_PARITY_CHK) >> 8; if (sc->sc_options & SI_FORCE_POLLING) ncr_sc->sc_flags |= NCR5380_FORCE_POLLING; #if 1 /* XXX - Temporary */ /* XXX - In case we think DMA is completely broken... */ if (sc->sc_options & SI_DISABLE_DMA) { /* Override this function pointer. */ ncr_sc->sc_dma_alloc = NULL; } #endif ncr_sc->sc_min_dma_len = MIN_DMA_LEN; /* * Initialize fields used by the MI code */ ncr_sc->sci_r0 = ®s->sci.sci_r0; ncr_sc->sci_r1 = ®s->sci.sci_r1; ncr_sc->sci_r2 = ®s->sci.sci_r2; ncr_sc->sci_r3 = ®s->sci.sci_r3; ncr_sc->sci_r4 = ®s->sci.sci_r4; ncr_sc->sci_r5 = ®s->sci.sci_r5; ncr_sc->sci_r6 = ®s->sci.sci_r6; ncr_sc->sci_r7 = ®s->sci.sci_r7; ncr_sc->sc_rev = NCR_VARIANT_NCR5380; /* * Allocate DMA handles. */ i = SCI_OPENINGS * sizeof(struct si_dma_handle); sc->sc_dma = kmem_alloc(i, KM_SLEEP); for (i = 0; i < SCI_OPENINGS; i++) sc->sc_dma[i].dh_flags = 0; ncr_sc->sc_channel.chan_id = 7; ncr_sc->sc_adapter.adapt_minphys = si_minphys; /* * Initialize si board itself. */ ncr5380_attach(ncr_sc); } static void si_minphys(struct buf *bp) { if (bp->b_bcount > MAX_DMA_LEN) { #ifdef DEBUG if (si_debug) { printf("%s len = 0x%x.\n", __func__, bp->b_bcount); Debugger(); } #endif bp->b_bcount = MAX_DMA_LEN; } minphys(bp); } #define CSR_WANT (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \ SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR ) int si_intr(void *arg) { struct si_softc *sc = arg; volatile struct si_regs *si = sc->sc_regs; int dma_error, claimed; u_short csr; claimed = 0; dma_error = 0; /* SBC interrupt? DMA interrupt? */ csr = si->si_csr; NCR_TRACE("si_intr: csr=0x%x\n", csr); if (csr & SI_CSR_DMA_CONFLICT) { dma_error |= SI_CSR_DMA_CONFLICT; printf("%s: DMA conflict\n", __func__); } if (csr & SI_CSR_DMA_BUS_ERR) { dma_error |= SI_CSR_DMA_BUS_ERR; printf("%s: DMA bus error\n", __func__); } if (dma_error) { if (sc->ncr_sc.sc_state & NCR_DOINGDMA) sc->ncr_sc.sc_state |= NCR_ABORTING; /* Make sure we will call the main isr. */ csr |= SI_CSR_DMA_IP; } if (csr & (SI_CSR_SBC_IP | SI_CSR_DMA_IP)) { claimed = ncr5380_intr(&sc->ncr_sc); #ifdef DEBUG if (!claimed) { printf("%s: spurious from SBC\n", __func__); if (si_debug & 4) Debugger(); /* XXX */ } #endif /* Yes, we DID cause this interrupt. */ claimed = 1; } return claimed; } /***************************************************************** * Common functions for DMA ****************************************************************/ /* * Allocate a DMA handle and put it in sc->sc_dma. Prepare * for DMA transfer. On the Sun3, this means mapping the buffer * into DVMA space. dvma_mapin() flushes the cache for us. */ void si_dma_alloc(struct ncr5380_softc *ncr_sc) { struct si_softc *sc = (struct si_softc *)ncr_sc; struct sci_req *sr = ncr_sc->sc_current; struct scsipi_xfer *xs = sr->sr_xs; struct si_dma_handle *dh; int i, xlen; void *addr; #ifdef DIAGNOSTIC if (sr->sr_dma_hand != NULL) panic("%s: already have DMA handle", __func__); #endif addr = ncr_sc->sc_dataptr; xlen = ncr_sc->sc_datalen; /* If the DMA start addr is misaligned then do PIO */ if (((vaddr_t)addr & 1) || (xlen & 1)) { printf("%s: misaligned.\n", __func__); return; } /* Make sure our caller checked sc_min_dma_len. */ if (xlen < MIN_DMA_LEN) panic("%s: xlen=0x%x", __func__, xlen); /* * Never attempt single transfers of more than 63k, because * our count register may be only 16 bits (an OBIO adapter). * This should never happen since already bounded by minphys(). * XXX - Should just segment these... */ if (xlen > MAX_DMA_LEN) { printf("%s: excessive xlen=0x%x\n", __func__, xlen); Debugger(); ncr_sc->sc_datalen = xlen = MAX_DMA_LEN; } /* Find free DMA handle. Guaranteed to find one since we have as many DMA handles as the driver has processes. */ for (i = 0; i < SCI_OPENINGS; i++) { if ((sc->sc_dma[i].dh_flags & SIDH_BUSY) == 0) goto found; } panic("si: no free DMA handles."); found: dh = &sc->sc_dma[i]; dh->dh_flags = SIDH_BUSY; if (bus_dmamap_load(sc->sc_dmat, sc->sc_dmap, addr, xlen, NULL, BUS_DMA_NOWAIT) != 0) panic("%s: can't load dmamap", device_xname(ncr_sc->sc_dev)); dh->dh_dmaaddr = sc->sc_dmap->dm_segs[0].ds_addr; dh->dh_dmalen = xlen; /* Copy the "write" flag for convenience. */ if (xs->xs_control & XS_CTL_DATA_OUT) dh->dh_flags |= SIDH_OUT; bus_dmamap_sync(sc->sc_dmat, sc->sc_dmap, 0, dh->dh_dmalen, (dh->dh_flags & SIDH_OUT) == 0 ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); #if 0 /* * Some machines might not need to remap B_PHYS buffers. * The sun3 does not map B_PHYS buffers into DVMA space, * (they are mapped into normal KV space) so on the sun3 * we must always remap to a DVMA address here. Re-map is * cheap anyway, because it's done by segments, not pages. */ if (xs->bp && (xs->bp->b_flags & B_PHYS)) dh->dh_flags |= SIDH_PHYS; #endif /* success */ sr->sr_dma_hand = dh; return; } void si_dma_free(struct ncr5380_softc *ncr_sc) { struct si_softc *sc = (struct si_softc *)ncr_sc; struct sci_req *sr = ncr_sc->sc_current; struct si_dma_handle *dh = sr->sr_dma_hand; #ifdef DIAGNOSTIC if (dh == NULL) panic("%s: no DMA handle", __func__); #endif if (ncr_sc->sc_state & NCR_DOINGDMA) panic("%s: free while in progress", __func__); if (dh->dh_flags & SIDH_BUSY) { bus_dmamap_sync(sc->sc_dmat, sc->sc_dmap, 0, dh->dh_dmalen, (dh->dh_flags & SIDH_OUT) == 0 ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(sc->sc_dmat, sc->sc_dmap); dh->dh_dmaaddr = 0; dh->dh_flags = 0; } sr->sr_dma_hand = NULL; } #define CSR_MASK (SI_CSR_SBC_IP | SI_CSR_DMA_IP | \ SI_CSR_DMA_CONFLICT | SI_CSR_DMA_BUS_ERR) #define POLL_TIMO 50000 /* X100 = 5 sec. */ /* * Poll (spin-wait) for DMA completion. * Called right after xx_dma_start(), and * xx_dma_stop() will be called next. * Same for either VME or OBIO. */ void si_dma_poll(struct ncr5380_softc *ncr_sc) { struct si_softc *sc = (struct si_softc *)ncr_sc; struct sci_req *sr = ncr_sc->sc_current; volatile struct si_regs *si = sc->sc_regs; int tmo; /* Make sure DMA started successfully. */ if (ncr_sc->sc_state & NCR_ABORTING) return; /* * XXX: The Sun driver waits for ~SI_CSR_DMA_ACTIVE here * XXX: (on obio) or even worse (on vme) a 10mS. delay! * XXX: I really doubt that is necessary... */ /* Wait for any "DMA complete" or error bits. */ tmo = POLL_TIMO; for (;;) { if (si->si_csr & CSR_MASK) break; if (--tmo <= 0) { printf("si: DMA timeout (while polling)\n"); /* Indicate timeout as MI code would. */ sr->sr_flags |= SR_OVERDUE; break; } delay(100); } NCR_TRACE("si_dma_poll: waited %d\n", POLL_TIMO - tmo); #ifdef DEBUG if (si_debug & 2) { printf("%s: done, csr=0x%x\n", __func__, si->si_csr); } #endif }