/* $NetBSD: asc_ioasic.c,v 1.12 2001/08/26 11:47:25 simonb Exp $ */ /*- * Copyright (c) 2000 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Tohru Nishimura. * * 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 the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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. */ #include /* RCS ID & Copyright macro defns */ __KERNEL_RCSID(0, "$NetBSD: asc_ioasic.c,v 1.12 2001/08/26 11:47:25 simonb Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct asc_softc { struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ bus_space_tag_t sc_bst; /* bus space tag */ bus_space_handle_t sc_bsh; /* bus space handle */ bus_space_handle_t sc_scsi_bsh; /* ASC register handle */ bus_dma_tag_t sc_dmat; /* bus dma tag */ bus_dmamap_t sc_dmamap; /* bus dmamap */ caddr_t *sc_dmaaddr; size_t *sc_dmalen; size_t sc_dmasize; unsigned sc_flags; #define ASC_ISPULLUP 0x0001 #define ASC_DMAACTIVE 0x0002 #define ASC_MAPLOADED 0x0004 }; static int asc_ioasic_match __P((struct device *, struct cfdata *, void *)); static void asc_ioasic_attach __P((struct device *, struct device *, void *)); struct cfattach asc_ioasic_ca = { sizeof(struct asc_softc), asc_ioasic_match, asc_ioasic_attach }; static u_char asc_read_reg __P((struct ncr53c9x_softc *, int)); static void asc_write_reg __P((struct ncr53c9x_softc *, int, u_char)); static int asc_dma_isintr __P((struct ncr53c9x_softc *sc)); static void asc_ioasic_reset __P((struct ncr53c9x_softc *)); static int asc_ioasic_intr __P((struct ncr53c9x_softc *)); static int asc_ioasic_setup __P((struct ncr53c9x_softc *, caddr_t *, size_t *, int, size_t *)); static void asc_ioasic_go __P((struct ncr53c9x_softc *)); static void asc_ioasic_stop __P((struct ncr53c9x_softc *)); static int asc_dma_isactive __P((struct ncr53c9x_softc *)); static void asc_clear_latched_intr __P((struct ncr53c9x_softc *)); static struct ncr53c9x_glue asc_ioasic_glue = { asc_read_reg, asc_write_reg, asc_dma_isintr, asc_ioasic_reset, asc_ioasic_intr, asc_ioasic_setup, asc_ioasic_go, asc_ioasic_stop, asc_dma_isactive, asc_clear_latched_intr, }; static int asc_ioasic_match(parent, cfdata, aux) struct device *parent; struct cfdata *cfdata; void *aux; { struct ioasicdev_attach_args *d = aux; if (strncmp("asc", d->iada_modname, TC_ROM_LLEN)) return 0; return 1; } static void asc_ioasic_attach(parent, self, aux) struct device *parent, *self; void *aux; { struct ioasicdev_attach_args *d = aux; struct asc_softc *asc = (struct asc_softc *)self; struct ncr53c9x_softc *sc = &asc->sc_ncr53c9x; /* * Set up glue for MI code early; we use some of it here. */ sc->sc_glue = &asc_ioasic_glue; asc->sc_bst = ((struct ioasic_softc *)parent)->sc_bst; asc->sc_bsh = ((struct ioasic_softc *)parent)->sc_bsh; if (bus_space_subregion(asc->sc_bst, asc->sc_bsh, IOASIC_SLOT_12_START, 0x100, &asc->sc_scsi_bsh)) { printf(": failed to map device registers\n"); return; } asc->sc_dmat = ((struct ioasic_softc *)parent)->sc_dmat; if (bus_dmamap_create(asc->sc_dmat, NBPG * 2, 2, NBPG, NBPG, BUS_DMA_NOWAIT, &asc->sc_dmamap)) { printf(": failed to create DMA map\n"); return; } sc->sc_id = 7; sc->sc_freq = 25000000; /* gimme Mhz */ sc->sc_freq /= 1000000; ioasic_intr_establish(parent, d->iada_cookie, TC_IPL_BIO, ncr53c9x_intr, sc); /* * XXX More of this should be in ncr53c9x_attach(), but * XXX should we really poke around the chip that much in * XXX the MI code? Think about this more... */ /* * Set up static configuration info. */ sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; sc->sc_cfg2 = NCRCFG2_SCSI2; sc->sc_cfg3 = 0; sc->sc_rev = NCR_VARIANT_NCR53C94; /* * XXX minsync and maxxfer _should_ be set up in MI code, * XXX but it appears to have some dependency on what sort * XXX of DMA we're hooked up to, etc. */ /* * This is the value used to start sync negotiations * Note that the NCR 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) * 5 / 4 ; sc->sc_maxxfer = 64 * 1024; /* Do the common parts of attachment. */ sc->sc_adapter.adapt_minphys = minphys; sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request; ncr53c9x_attach(sc); } void asc_ioasic_reset(sc) struct ncr53c9x_softc *sc; { struct asc_softc *asc = (struct asc_softc *)sc; u_int32_t ssr; ssr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR); ssr &= ~IOASIC_CSR_DMAEN_SCSI; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR, ssr); bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SCR, 0); if (asc->sc_flags & ASC_MAPLOADED) bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap); asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED); } #define TWOPAGE(a) (NBPG*2 - ((a) & (NBPG-1))) int asc_ioasic_setup(sc, addr, len, ispullup, dmasize) struct ncr53c9x_softc *sc; caddr_t *addr; size_t *len; int ispullup; size_t *dmasize; { struct asc_softc *asc = (struct asc_softc *)sc; u_int32_t ssr, scr, *p; size_t size; vaddr_t cp; NCR_DMA(("%s: start %d@%p,%s\n", sc->sc_dev.dv_xname, *asc->sc_dmalen, *asc->sc_dmaaddr, ispullup ? "IN" : "OUT")); /* upto two 4KB pages */ size = min(*dmasize, TWOPAGE((size_t)*addr)); asc->sc_dmaaddr = addr; asc->sc_dmalen = len; asc->sc_dmasize = size; asc->sc_flags = (ispullup) ? ASC_ISPULLUP : 0; *dmasize = size; /* return trimmed transfer size */ /* stop DMA engine first */ ssr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR); ssr &= ~IOASIC_CSR_DMAEN_SCSI; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR, ssr); /* have dmamap for the transfering addresses */ if (bus_dmamap_load(asc->sc_dmat, asc->sc_dmamap, *addr, size, NULL /* kernel address */, BUS_DMA_NOWAIT)) panic("%s: cannot allocate DMA address", sc->sc_dev.dv_xname); /* take care of 8B constraint on starting address */ cp = (vaddr_t)*addr; if ((cp & 7) == 0) { /* comfortably aligned to 8B boundary */ scr = 0; } else { /* truncate to the boundary */ p = (u_int32_t *)(cp & ~7); /* how many 16bit quantities in subject */ scr = (cp & 7) >> 1; /* trim down physical address too */ asc->sc_dmamap->dm_segs[0].ds_addr &= ~7; asc->sc_dmamap->dm_segs[0].ds_len += (cp & 6); if ((asc->sc_flags & ASC_ISPULLUP) == 0) { /* push down to SCSI device */ scr |= 4; /* round up physical address in this case */ asc->sc_dmamap->dm_segs[0].ds_addr += 8; /* don't care excess cache flush */ } /* pack fixup data in SDR0/SDR1 pair and instruct SCR */ bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SDR0, p[0]); bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SDR1, p[1]); } bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_DMAPTR, IOASIC_DMA_ADDR(asc->sc_dmamap->dm_segs[0].ds_addr)); bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_NEXTPTR, (asc->sc_dmamap->dm_nsegs == 1) ? ~0 : IOASIC_DMA_ADDR(asc->sc_dmamap->dm_segs[1].ds_addr)); bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SCR, scr); /* synchronize dmamap contents with memory image */ bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 0, size, (ispullup) ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); asc->sc_flags |= ASC_MAPLOADED; return 0; } void asc_ioasic_go(sc) struct ncr53c9x_softc *sc; { struct asc_softc *asc = (struct asc_softc *)sc; u_int32_t ssr; ssr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR); if (asc->sc_flags & ASC_ISPULLUP) ssr |= IOASIC_CSR_SCSI_DIR; else { /* ULTRIX does in this way */ ssr &= ~IOASIC_CSR_SCSI_DIR; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR, ssr); ssr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR); } ssr |= IOASIC_CSR_DMAEN_SCSI; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR, ssr); asc->sc_flags |= ASC_DMAACTIVE; } static int asc_ioasic_intr(sc) struct ncr53c9x_softc *sc; { struct asc_softc *asc = (struct asc_softc *)sc; int trans, resid; u_int tcl, tcm, ssr, scr, intr; if ((asc->sc_flags & ASC_DMAACTIVE) == 0) panic("ioasic_intr: DMA wasn't active"); #define IOASIC_ASC_ERRORS \ (IOASIC_INTR_SCSI_PTR_LOAD|IOASIC_INTR_SCSI_OVRUN|IOASIC_INTR_SCSI_READ_E) /* * When doing polled I/O, the SCSI bits in the interrupt register won't * get cleared by the interrupt processing. This will cause the DMA * address registers to not load on the next DMA transfer. * Check for these bits here, and clear them if needed. */ intr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_INTR); if ((intr & IOASIC_ASC_ERRORS) != 0) { intr &= ~IOASIC_ASC_ERRORS; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_INTR, intr); } /* DMA has stopped */ ssr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR); ssr &= ~IOASIC_CSR_DMAEN_SCSI; bus_space_write_4(asc->sc_bst, asc->sc_bsh, IOASIC_CSR, ssr); asc->sc_flags &= ~ASC_DMAACTIVE; if (asc->sc_dmasize == 0) { /* A "Transfer Pad" operation completed */ tcl = NCR_READ_REG(sc, NCR_TCL); tcm = NCR_READ_REG(sc, NCR_TCM); NCR_DMA(("ioasic_intr: discarded %d bytes (tcl=%d, tcm=%d)\n", tcl | (tcm << 8), tcl, tcm)); return 0; } resid = 0; if ((asc->sc_flags & ASC_ISPULLUP) == 0 && (resid = (NCR_READ_REG(sc, NCR_FFLAG) & NCRFIFO_FF)) != 0) { NCR_DMA(("ioasic_intr: empty FIFO of %d ", resid)); DELAY(1); } resid += (tcl = NCR_READ_REG(sc, NCR_TCL)); resid += (tcm = NCR_READ_REG(sc, NCR_TCM)) << 8; trans = asc->sc_dmasize - resid; if (trans < 0) { /* transferred < 0 ? */ printf("ioasic_intr: xfer (%d) > req (%d)\n", trans, asc->sc_dmasize); trans = asc->sc_dmasize; } NCR_DMA(("ioasic_intr: tcl=%d, tcm=%d; trans=%d, resid=%d\n", tcl, tcm, trans, resid)); bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 0, asc->sc_dmasize, (asc->sc_flags & ASC_ISPULLUP) ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); scr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SCR); if ((asc->sc_flags & ASC_ISPULLUP) && scr != 0) { u_int32_t sdr[2], ptr; sdr[0] = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SDR0); sdr[1] = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_SDR1); ptr = bus_space_read_4(asc->sc_bst, asc->sc_bsh, IOASIC_SCSI_DMAPTR); ptr = (ptr >> 3) & 0x1ffffffc; /* * scr: 1 -> short[0] * 2 -> short[0] + short[1] * 3 -> short[0] + short[1] + short[2] */ scr &= IOASIC_SCR_WORD; memcpy((void *)MIPS_PHYS_TO_KSEG0(ptr), sdr, scr << 1); } bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap); asc->sc_flags &= ~ASC_MAPLOADED; *asc->sc_dmalen -= trans; *asc->sc_dmaaddr += trans; return 0; } void asc_ioasic_stop(sc) struct ncr53c9x_softc *sc; { struct asc_softc *asc = (struct asc_softc *)sc; if (asc->sc_flags & ASC_MAPLOADED) { bus_dmamap_sync(asc->sc_dmat, asc->sc_dmamap, 0, asc->sc_dmasize, (asc->sc_flags & ASC_ISPULLUP) ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(asc->sc_dmat, asc->sc_dmamap); } asc->sc_flags &= ~(ASC_DMAACTIVE|ASC_MAPLOADED); } static u_char asc_read_reg(sc, reg) struct ncr53c9x_softc *sc; int reg; { struct asc_softc *asc = (struct asc_softc *)sc; u_int32_t v; v = bus_space_read_4(asc->sc_bst, asc->sc_scsi_bsh, reg * sizeof(u_int32_t)); return v & 0xff; } static void asc_write_reg(sc, reg, val) struct ncr53c9x_softc *sc; int reg; u_char val; { struct asc_softc *asc = (struct asc_softc *)sc; bus_space_write_4(asc->sc_bst, asc->sc_scsi_bsh, reg * sizeof(u_int32_t), val); } static int asc_dma_isintr(sc) struct ncr53c9x_softc *sc; { return !!(NCR_READ_REG(sc, NCR_STAT) & NCRSTAT_INT); } static int asc_dma_isactive(sc) struct ncr53c9x_softc *sc; { struct asc_softc *asc = (struct asc_softc *)sc; return !!(asc->sc_flags & ASC_DMAACTIVE); } static void asc_clear_latched_intr(sc) struct ncr53c9x_softc *sc; { }