/* $NetBSD: pcscp.c,v 1.47 2014/03/29 19:28:25 christos Exp $ */ /*- * Copyright (c) 1997, 1998, 1999 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center; Izumi Tsutsui. * * 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. */ /* * pcscp.c: device dependent code for AMD Am53c974 (PCscsi-PCI) * written by Izumi Tsutsui * * Technical manual available at * http://www.amd.com/files/connectivitysolutions/networking/archivednetworking/19113.pdf */ #include __KERNEL_RCSID(0, "$NetBSD: pcscp.c,v 1.47 2014/03/29 19:28:25 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define IO_MAP_REG 0x10 struct pcscp_softc { struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ bus_space_tag_t sc_st; /* bus space tag */ bus_space_handle_t sc_sh; /* bus space handle */ void *sc_ih; /* interrupt cookie */ bus_dma_tag_t sc_dmat; /* DMA tag */ bus_dmamap_t sc_xfermap; /* DMA map for transfers */ uint32_t *sc_mdladdr; /* MDL array */ bus_dmamap_t sc_mdldmap; /* MDL DMA map */ int sc_active; /* DMA state */ int sc_datain; /* DMA Data Direction */ size_t sc_dmasize; /* DMA size */ uint8_t **sc_dmaaddr; /* DMA address */ size_t *sc_dmalen; /* DMA length */ }; #define READ_DMAREG(sc, reg) \ bus_space_read_4((sc)->sc_st, (sc)->sc_sh, (reg)) #define WRITE_DMAREG(sc, reg, var) \ bus_space_write_4((sc)->sc_st, (sc)->sc_sh, (reg), (var)) #define PCSCP_READ_REG(sc, reg) \ bus_space_read_1((sc)->sc_st, (sc)->sc_sh, (reg) << 2) #define PCSCP_WRITE_REG(sc, reg, val) \ bus_space_write_1((sc)->sc_st, (sc)->sc_sh, (reg) << 2, (val)) static int pcscp_match(device_t, cfdata_t, void *); static void pcscp_attach(device_t, device_t, void *); CFATTACH_DECL_NEW(pcscp, sizeof(struct pcscp_softc), pcscp_match, pcscp_attach, NULL, NULL); /* * Functions and the switch for the MI code. */ static uint8_t pcscp_read_reg(struct ncr53c9x_softc *, int); static void pcscp_write_reg(struct ncr53c9x_softc *, int, uint8_t); static int pcscp_dma_isintr(struct ncr53c9x_softc *); static void pcscp_dma_reset(struct ncr53c9x_softc *); static int pcscp_dma_intr(struct ncr53c9x_softc *); static int pcscp_dma_setup(struct ncr53c9x_softc *, uint8_t **, size_t *, int, size_t *); static void pcscp_dma_go(struct ncr53c9x_softc *); static void pcscp_dma_stop(struct ncr53c9x_softc *); static int pcscp_dma_isactive(struct ncr53c9x_softc *); static struct ncr53c9x_glue pcscp_glue = { pcscp_read_reg, pcscp_write_reg, pcscp_dma_isintr, pcscp_dma_reset, pcscp_dma_intr, pcscp_dma_setup, pcscp_dma_go, pcscp_dma_stop, pcscp_dma_isactive, NULL, /* gl_clear_latched_intr */ }; static int pcscp_match(device_t parent, cfdata_t cf, void *aux) { struct pci_attach_args *pa = aux; if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_AMD) return 0; switch (PCI_PRODUCT(pa->pa_id)) { case PCI_PRODUCT_AMD_PCSCSI_PCI: return 1; } return 0; } /* * Attach this instance, and then all the sub-devices */ static void pcscp_attach(device_t parent, device_t self, void *aux) { struct pcscp_softc *esc = device_private(self); struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x; struct pci_attach_args *pa = aux; bus_space_tag_t iot; bus_space_handle_t ioh; pci_intr_handle_t ih; const char *intrstr; pcireg_t csr; bus_dma_segment_t seg; int error, rseg; char intrbuf[PCI_INTRSTR_LEN]; sc->sc_dev = self; pci_aprint_devinfo(pa, NULL); aprint_normal("%s", device_xname(sc->sc_dev)); if (pci_mapreg_map(pa, IO_MAP_REG, PCI_MAPREG_TYPE_IO, 0, &iot, &ioh, NULL, NULL)) { aprint_error(": unable to map registers\n"); return; } sc->sc_glue = &pcscp_glue; esc->sc_st = iot; esc->sc_sh = ioh; esc->sc_dmat = pa->pa_dmat; csr = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG); pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, csr | PCI_COMMAND_MASTER_ENABLE | PCI_COMMAND_IO_ENABLE); /* * 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. */ /* * XXX should read configuration from EEPROM? * * MI ncr53c9x driver does not support configuration * per each target device, though... */ sc->sc_id = 7; sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_FE; sc->sc_cfg3 = NCRAMDCFG3_IDM | NCRAMDCFG3_FCLK; sc->sc_cfg4 = NCRAMDCFG4_GE12NS | NCRAMDCFG4_RADE; sc->sc_rev = NCR_VARIANT_AM53C974; sc->sc_features = NCR_F_FASTSCSI; sc->sc_cfg3_fscsi = NCRAMDCFG3_FSCSI; sc->sc_freq = 40; /* MHz */ /* * 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; /* Really no limit, but since we want to fit into the TCR... */ sc->sc_maxxfer = 16 * 1024 * 1024; /* * Create the DMA maps for the data transfers. */ #define MDL_SEG_SIZE 0x1000 /* 4kbyte per segment */ #define MDL_SEG_OFFSET 0x0FFF #define MDL_SIZE (MAXPHYS / MDL_SEG_SIZE + 1) /* no hardware limit? */ if (bus_dmamap_create(esc->sc_dmat, MAXPHYS, MDL_SIZE, MDL_SEG_SIZE, MDL_SEG_SIZE, BUS_DMA_NOWAIT, &esc->sc_xfermap)) { aprint_error(": can't create DMA maps\n"); return; } /* * Allocate and map memory for the MDL. */ if ((error = bus_dmamem_alloc(esc->sc_dmat, sizeof(uint32_t) * MDL_SIZE, PAGE_SIZE, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) { aprint_error(": unable to allocate memory for the MDL," " error = %d\n", error); goto fail_0; } if ((error = bus_dmamem_map(esc->sc_dmat, &seg, rseg, sizeof(uint32_t) * MDL_SIZE , (void **)&esc->sc_mdladdr, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) { aprint_error(": unable to map the MDL memory, error = %d\n", error); goto fail_1; } if ((error = bus_dmamap_create(esc->sc_dmat, sizeof(uint32_t) * MDL_SIZE, 1, sizeof(uint32_t) * MDL_SIZE, 0, BUS_DMA_NOWAIT, &esc->sc_mdldmap)) != 0) { aprint_error(": unable to map_create for the MDL, error = %d\n", error); goto fail_2; } if ((error = bus_dmamap_load(esc->sc_dmat, esc->sc_mdldmap, esc->sc_mdladdr, sizeof(uint32_t) * MDL_SIZE, NULL, BUS_DMA_NOWAIT)) != 0) { aprint_error(": unable to load for the MDL, error = %d\n", error); goto fail_3; } /* map and establish interrupt */ if (pci_intr_map(pa, &ih)) { aprint_error(": couldn't map interrupt\n"); goto fail_4; } intrstr = pci_intr_string(pa->pa_pc, ih, intrbuf, sizeof(intrbuf)); esc->sc_ih = pci_intr_establish(pa->pa_pc, ih, IPL_BIO, ncr53c9x_intr, esc); if (esc->sc_ih == NULL) { aprint_error(": couldn't establish interrupt"); if (intrstr != NULL) aprint_error(" at %s", intrstr); aprint_error("\n"); goto fail_4; } if (intrstr != NULL) { aprint_normal(": interrupting at %s\n", intrstr); aprint_normal("%s", device_xname(sc->sc_dev)); } /* Do the common parts of attachment. */ sc->sc_adapter.adapt_minphys = minphys; sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request; ncr53c9x_attach(sc); /* Turn on target selection using the `DMA' method */ sc->sc_features |= NCR_F_DMASELECT; return; fail_4: bus_dmamap_unload(esc->sc_dmat, esc->sc_mdldmap); fail_3: bus_dmamap_destroy(esc->sc_dmat, esc->sc_mdldmap); fail_2: bus_dmamem_unmap(esc->sc_dmat, (void *)esc->sc_mdldmap, sizeof(uint32_t) * MDL_SIZE); fail_1: bus_dmamem_free(esc->sc_dmat, &seg, rseg); fail_0: bus_dmamap_destroy(esc->sc_dmat, esc->sc_xfermap); } /* * Glue functions. */ static uint8_t pcscp_read_reg(struct ncr53c9x_softc *sc, int reg) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; return PCSCP_READ_REG(esc, reg); } static void pcscp_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t v) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; PCSCP_WRITE_REG(esc, reg, v); } static int pcscp_dma_isintr(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; return (PCSCP_READ_REG(esc, NCR_STAT) & NCRSTAT_INT) != 0; } static void pcscp_dma_reset(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE); esc->sc_active = 0; } static int pcscp_dma_intr(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; int trans, resid, i; bus_dmamap_t dmap = esc->sc_xfermap; int datain = esc->sc_datain; uint32_t dmastat; uint8_t *p = NULL; dmastat = READ_DMAREG(esc, DMA_STAT); if (dmastat & DMASTAT_ERR) { /* XXX not tested... */ WRITE_DMAREG(esc, DMA_CMD, DMACMD_ABORT | (datain ? DMACMD_DIR : 0)); printf("%s: error: DMA error detected; Aborting.\n", device_xname(sc->sc_dev)); bus_dmamap_unload(esc->sc_dmat, dmap); return -1; } if (dmastat & DMASTAT_ABT) { /* XXX What should be done? */ printf("%s: %s: DMA aborted.\n", device_xname(sc->sc_dev), __func__); WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | (datain ? DMACMD_DIR : 0)); esc->sc_active = 0; return 0; } #ifdef DIAGNOSTIC /* This is an "assertion" :) */ if (esc->sc_active == 0) panic("%s: %s: DMA wasn't active", device_xname(sc->sc_dev), __func__); #endif /* DMA has stopped */ esc->sc_active = 0; if (esc->sc_dmasize == 0) { /* A "Transfer Pad" operation completed */ NCR_DMA(("%s: discarded %d bytes (tcl=%d, tcm=%d)\n", __func__, PCSCP_READ_REG(esc, NCR_TCL) | (PCSCP_READ_REG(esc, NCR_TCM) << 8), PCSCP_READ_REG(esc, NCR_TCL), PCSCP_READ_REG(esc, NCR_TCM))); return 0; } resid = 0; /* * If a transfer onto the SCSI bus gets interrupted by the device * (e.g. for a SAVEPOINTER message), the data in the FIFO counts * as residual since the ESP counter registers get decremented as * bytes are clocked into the FIFO. */ if (!datain && (resid = (PCSCP_READ_REG(esc, NCR_FFLAG) & NCRFIFO_FF)) != 0) { NCR_DMA(("%s: empty esp FIFO of %d ", __func__, resid)); } if ((sc->sc_espstat & NCRSTAT_TC) == 0) { /* * `Terminal count' is off, so read the residue * out of the ESP counter registers. */ if (datain) { resid = PCSCP_READ_REG(esc, NCR_FFLAG) & NCRFIFO_FF; while (resid > 1) resid = PCSCP_READ_REG(esc, NCR_FFLAG) & NCRFIFO_FF; WRITE_DMAREG(esc, DMA_CMD, DMACMD_BLAST | DMACMD_MDL | (datain ? DMACMD_DIR : 0)); for (i = 0; i < 1000; i++) { /* XXX */ if (READ_DMAREG(esc, DMA_STAT) & DMASTAT_BCMP) break; DELAY(1); } /* See the below comments... */ if (resid) p = *esc->sc_dmaaddr; } resid += PCSCP_READ_REG(esc, NCR_TCL) | (PCSCP_READ_REG(esc, NCR_TCM) << 8) | (PCSCP_READ_REG(esc, NCR_TCH) << 16); } else { while ((dmastat & DMASTAT_DONE) == 0) dmastat = READ_DMAREG(esc, DMA_STAT); } WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | (datain ? DMACMD_DIR : 0)); /* sync MDL */ bus_dmamap_sync(esc->sc_dmat, esc->sc_mdldmap, 0, sizeof(uint32_t) * dmap->dm_nsegs, BUS_DMASYNC_POSTWRITE); /* sync transfer buffer */ bus_dmamap_sync(esc->sc_dmat, dmap, 0, dmap->dm_mapsize, datain ? BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE); bus_dmamap_unload(esc->sc_dmat, dmap); trans = esc->sc_dmasize - resid; /* * From the technical manual notes: * * `In some odd byte conditions, one residual byte will be left * in the SCSI FIFO, and the FIFO flags will never count to 0. * When this happens, the residual byte should be retrieved * via PIO following completion of the BLAST operation.' */ if (p) { p += trans; *p = PCSCP_READ_REG(esc, NCR_FIFO); trans++; } if (trans < 0) { /* transferred < 0 ? */ #if 0 /* * This situation can happen in perfectly normal operation * if the ESP is reselected while using DMA to select * another target. As such, don't print the warning. */ printf("%s: xfer (%d) > req (%d)\n", device_xname(sc->sc_dev), trans, esc->sc_dmasize); #endif trans = esc->sc_dmasize; } NCR_DMA(("%s: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n", __func__, PCSCP_READ_REG(esc, NCR_TCL), PCSCP_READ_REG(esc, NCR_TCM), PCSCP_READ_REG(esc, NCR_TCH), trans, resid)); *esc->sc_dmalen -= trans; *esc->sc_dmaaddr += trans; return 0; } static int pcscp_dma_setup(struct ncr53c9x_softc *sc, uint8_t **addr, size_t *len, int datain, size_t *dmasize) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; bus_dmamap_t dmap = esc->sc_xfermap; uint32_t *mdl; int error, nseg, seg; bus_addr_t s_offset, s_addr; WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | (datain ? DMACMD_DIR : 0)); esc->sc_dmaaddr = addr; esc->sc_dmalen = len; esc->sc_dmasize = *dmasize; esc->sc_datain = datain; #ifdef DIAGNOSTIC if ((*dmasize / MDL_SEG_SIZE) > MDL_SIZE) panic("%s: transfer size too large", device_xname(sc->sc_dev)); #endif /* * No need to set up DMA in `Transfer Pad' operation. * (case of *dmasize == 0) */ if (*dmasize == 0) return 0; error = bus_dmamap_load(esc->sc_dmat, dmap, *esc->sc_dmaaddr, *esc->sc_dmalen, NULL, ((sc->sc_nexus->xs->xs_control & XS_CTL_NOSLEEP) ? BUS_DMA_NOWAIT : BUS_DMA_WAITOK) | BUS_DMA_STREAMING | ((sc->sc_nexus->xs->xs_control & XS_CTL_DATA_IN) ? BUS_DMA_READ : BUS_DMA_WRITE)); if (error) { printf("%s: unable to load dmamap, error = %d\n", device_xname(sc->sc_dev), error); return error; } /* set transfer length */ WRITE_DMAREG(esc, DMA_STC, *dmasize); /* set up MDL */ mdl = esc->sc_mdladdr; nseg = dmap->dm_nsegs; /* the first segment is possibly not aligned with 4k MDL boundary */ s_addr = dmap->dm_segs[0].ds_addr; s_offset = s_addr & MDL_SEG_OFFSET; s_addr -= s_offset; /* set the first MDL and offset */ WRITE_DMAREG(esc, DMA_SPA, s_offset); *mdl++ = htole32(s_addr); /* the rest dmamap segments are aligned with 4k boundary */ for (seg = 1; seg < nseg; seg++) *mdl++ = htole32(dmap->dm_segs[seg].ds_addr); return 0; } static void pcscp_dma_go(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; bus_dmamap_t dmap = esc->sc_xfermap, mdldmap = esc->sc_mdldmap; int datain = esc->sc_datain; /* No DMA transfer in Transfer Pad operation */ if (esc->sc_dmasize == 0) return; /* sync transfer buffer */ bus_dmamap_sync(esc->sc_dmat, dmap, 0, dmap->dm_mapsize, datain ? BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE); /* sync MDL */ bus_dmamap_sync(esc->sc_dmat, mdldmap, 0, sizeof(uint32_t) * dmap->dm_nsegs, BUS_DMASYNC_PREWRITE); /* set Starting MDL Address */ WRITE_DMAREG(esc, DMA_SMDLA, mdldmap->dm_segs[0].ds_addr); /* set DMA command register bits */ /* XXX DMA Transfer Interrupt Enable bit is broken? */ WRITE_DMAREG(esc, DMA_CMD, DMACMD_IDLE | DMACMD_MDL | /* DMACMD_INTE | */ (datain ? DMACMD_DIR : 0)); /* issue DMA start command */ WRITE_DMAREG(esc, DMA_CMD, DMACMD_START | DMACMD_MDL | /* DMACMD_INTE | */ (datain ? DMACMD_DIR : 0)); esc->sc_active = 1; } static void pcscp_dma_stop(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; /* DMA stop */ /* XXX What should we do here ? */ WRITE_DMAREG(esc, DMA_CMD, DMACMD_ABORT | (esc->sc_datain ? DMACMD_DIR : 0)); bus_dmamap_unload(esc->sc_dmat, esc->sc_xfermap); esc->sc_active = 0; } static int pcscp_dma_isactive(struct ncr53c9x_softc *sc) { struct pcscp_softc *esc = (struct pcscp_softc *)sc; /* XXX should check esc->sc_active? */ if ((READ_DMAREG(esc, DMA_CMD) & DMACMD_CMD) != DMACMD_IDLE) return 1; return 0; }