/* $OpenBSD: esp.c,v 1.5 2009/02/16 21:19:06 miod Exp $ */ /*- * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace * Simulation Facility, NASA Ames Research Center. * * 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. */ /* * Copyright (c) 1994 Peter Galbavy * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct esp_softc { struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ struct intrhand sc_ih; /* intr handler */ volatile u_char *sc_reg; /* the registers */ bus_dmamap_t sc_dmamap; bus_dma_tag_t sc_dmat; dbdma_t sc_dbdma; dbdma_regmap_t *sc_dmareg; /* DMA registers */ dbdma_command_t *sc_dmacmd; /* command area for DMA */ int sc_node; /* node ID */ int sc_intr; size_t sc_dmasize; caddr_t *sc_dmaaddr; size_t *sc_dmalen; int sc_dmaactive; int sc_dma_direction; }; #define D_WRITE 1 #define ESP_DMALIST_MAX 20 void espattach(struct device *, struct device *, void *); int espmatch(struct device *, void *, void *); /* Linkup to the rest of the kernel */ struct cfattach esp_ca = { sizeof(struct esp_softc), espmatch, espattach }; struct scsi_adapter esp_switch = { /* no max at this level; handled by DMA code */ ncr53c9x_scsi_cmd, scsi_minphys, NULL, NULL, }; struct scsi_device esp_dev = { NULL, NULL, NULL, NULL, }; /* * Functions and the switch for the MI code. */ u_char esp_read_reg(struct ncr53c9x_softc *, int); void esp_write_reg(struct ncr53c9x_softc *, int, u_char); int esp_dma_isintr(struct ncr53c9x_softc *); void esp_dma_reset(struct ncr53c9x_softc *); int esp_dma_intr(struct ncr53c9x_softc *); int esp_dma_setup(struct ncr53c9x_softc *, caddr_t *, size_t *, int, size_t *); void esp_dma_go(struct ncr53c9x_softc *); void esp_dma_stop(struct ncr53c9x_softc *); int esp_dma_isactive(struct ncr53c9x_softc *); struct ncr53c9x_glue esp_glue = { esp_read_reg, esp_write_reg, esp_dma_isintr, esp_dma_reset, esp_dma_intr, esp_dma_setup, esp_dma_go, esp_dma_stop, esp_dma_isactive, NULL, /* gl_clear_latched_intr */ }; static int espdmaintr(struct esp_softc *); static void esp_shutdownhook(void *); int espmatch(struct device *parent, void *cf, void *aux) { struct confargs *ca = aux; if (strcmp(ca->ca_name, "53c94") != 0) return 0; if (ca->ca_nreg != 16) return 0; if (ca->ca_nintr != 8) return 0; return 1; } /* * Attach this instance, and then all the sub-devices */ void espattach(struct device *parent, struct device *self, void *aux) { struct confargs *ca = aux; struct esp_softc *esc = (void *)self; struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x; u_int *reg; int sz, error; /* * Set up glue for MI code early; we use some of it here. */ sc->sc_glue = &esp_glue; esc->sc_node = ca->ca_node; esc->sc_intr = ca->ca_intr[0]; printf(" irq %d", esc->sc_intr); /* * Map my registers in. */ reg = ca->ca_reg; esc->sc_reg = mapiodev(ca->ca_baseaddr + reg[0], reg[1]); esc->sc_dmareg = mapiodev(ca->ca_baseaddr + reg[2], reg[3]); esc->sc_dmat = ca->ca_dmat; if ((error = bus_dmamap_create(esc->sc_dmat, ESP_DMALIST_MAX * DBDMA_COUNT_MAX, ESP_DMALIST_MAX, DBDMA_COUNT_MAX, NBPG, BUS_DMA_NOWAIT, &esc->sc_dmamap)) != 0) { printf(": cannot create dma map, error = %d\n", error); return; } /* Allocate 16-byte aligned DMA command space */ esc->sc_dbdma = dbdma_alloc(esc->sc_dmat, ESP_DMALIST_MAX); esc->sc_dmacmd = esc->sc_dbdma->d_addr; /* Other settings */ sc->sc_id = 7; sz = OF_getprop(ca->ca_node, "clock-frequency", &sc->sc_freq, sizeof(int)); if (sz != sizeof(int)) sc->sc_freq = 25000000; /* gimme MHz */ sc->sc_freq /= 1000000; /* * Set up static configuration info. */ sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; sc->sc_cfg2 = NCRCFG2_SCSI2; /* | NCRCFG2_FE */ sc->sc_cfg3 = NCRCFG3_CDB; sc->sc_rev = NCR_VARIANT_NCR53C94; /* * 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; sc->sc_maxxfer = 64 * 1024; /* and the interuppts */ mac_intr_establish(parent, esc->sc_intr, IST_LEVEL, IPL_BIO, ncr53c9x_intr, sc, sc->sc_dev.dv_xname); /* Reset SCSI bus when halt. */ shutdownhook_establish(esp_shutdownhook, sc); /* Turn on target selection using the `DMA' method */ sc->sc_features |= NCR_F_DMASELECT; ncr53c9x_attach(sc, &esp_switch, &esp_dev); } /* * Glue functions. */ u_char esp_read_reg(struct ncr53c9x_softc *sc, int reg) { struct esp_softc *esc = (struct esp_softc *)sc; return in8(&esc->sc_reg[reg * 16]); } void esp_write_reg(struct ncr53c9x_softc *sc, int reg, u_char val) { struct esp_softc *esc = (struct esp_softc *)sc; u_char v = val; out8(&esc->sc_reg[reg * 16], v); } int esp_dma_isintr(struct ncr53c9x_softc *sc) { return esp_read_reg(sc, NCR_STAT) & NCRSTAT_INT; } void esp_dma_reset(struct ncr53c9x_softc *sc) { struct esp_softc *esc = (struct esp_softc *)sc; dbdma_stop(esc->sc_dmareg); esc->sc_dmaactive = 0; } int esp_dma_intr(struct ncr53c9x_softc *sc) { struct esp_softc *esc = (struct esp_softc *)sc; return (espdmaintr(esc)); } int esp_dma_setup(struct ncr53c9x_softc *sc, caddr_t *addr, size_t *len, int datain, size_t *dmasize) { struct esp_softc *esc = (struct esp_softc *)sc; dbdma_command_t *cmdp; u_int cmd; int i, error; cmdp = esc->sc_dmacmd; cmd = datain ? DBDMA_CMD_IN_MORE : DBDMA_CMD_OUT_MORE; esc->sc_dmaaddr = addr; esc->sc_dmalen = len; esc->sc_dmasize = *dmasize; if ((error = bus_dmamap_load(esc->sc_dmat, esc->sc_dmamap, *addr, *dmasize, NULL, BUS_DMA_NOWAIT)) != 0) return (error); for (i = 0; i < esc->sc_dmamap->dm_nsegs; i++, cmdp++) { if (i + 1 == esc->sc_dmamap->dm_nsegs) cmd = datain ? DBDMA_CMD_IN_LAST : DBDMA_CMD_OUT_LAST; DBDMA_BUILD(cmdp, cmd, 0, esc->sc_dmamap->dm_segs[i].ds_len, esc->sc_dmamap->dm_segs[i].ds_addr, DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); } DBDMA_BUILD(cmdp, DBDMA_CMD_STOP, 0, 0, 0, DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); esc->sc_dma_direction = datain ? D_WRITE : 0; return 0; } void esp_dma_go(struct ncr53c9x_softc *sc) { struct esp_softc *esc = (struct esp_softc *)sc; dbdma_start(esc->sc_dmareg, esc->sc_dbdma); esc->sc_dmaactive = 1; } void esp_dma_stop(struct ncr53c9x_softc *sc) { struct esp_softc *esc = (struct esp_softc *)sc; dbdma_stop(esc->sc_dmareg); bus_dmamap_unload(esc->sc_dmat, esc->sc_dmamap); esc->sc_dmaactive = 0; } int esp_dma_isactive(struct ncr53c9x_softc *sc) { struct esp_softc *esc = (struct esp_softc *)sc; return (esc->sc_dmaactive); } /* * Pseudo (chained) interrupt from the esp driver to kick the * current running DMA transfer. I am replying on espintr() to * pickup and clean errors for now * * return 1 if it was a DMA continue. */ int espdmaintr(struct esp_softc *sc) { struct ncr53c9x_softc *nsc = (struct ncr53c9x_softc *)sc; int trans, resid; u_long csr = sc->sc_dma_direction; /* This is an "assertion" :) */ if (sc->sc_dmaactive == 0) panic("dmaintr: DMA wasn't active"); /* DMA has stopped */ dbdma_stop(sc->sc_dmareg); bus_dmamap_unload(sc->sc_dmat, sc->sc_dmamap); sc->sc_dmaactive = 0; if (sc->sc_dmasize == 0) { /* A "Transfer Pad" operation completed */ NCR_DMA(("dmaintr: discarded %d bytes (tcl=%d, tcm=%d)\n", NCR_READ_REG(nsc, NCR_TCL) | (NCR_READ_REG(nsc, NCR_TCM) << 8), NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, 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 (!(csr & D_WRITE) && (resid = (NCR_READ_REG(nsc, NCR_FFLAG) & NCRFIFO_FF)) != 0) { NCR_DMA(("dmaintr: empty esp FIFO of %d ", resid)); } if ((nsc->sc_espstat & NCRSTAT_TC) == 0) { /* * `Terminal count' is off, so read the residue * out of the ESP counter registers. */ resid += (NCR_READ_REG(nsc, NCR_TCL) | (NCR_READ_REG(nsc, NCR_TCM) << 8) | ((nsc->sc_cfg2 & NCRCFG2_FE) ? (NCR_READ_REG(nsc, NCR_TCH) << 16) : 0)); if (resid == 0 && sc->sc_dmasize == 65536 && (nsc->sc_cfg2 & NCRCFG2_FE) == 0) /* A transfer of 64K is encoded as `TCL=TCM=0' */ resid = 65536; } trans = sc->sc_dmasize - resid; if (trans < 0) { /* transferred < 0 ? */ trans = sc->sc_dmasize; } NCR_DMA(("dmaintr: tcl=%d, tcm=%d, tch=%d; trans=%d, resid=%d\n", NCR_READ_REG(nsc, NCR_TCL), NCR_READ_REG(nsc, NCR_TCM), (nsc->sc_cfg2 & NCRCFG2_FE) ? NCR_READ_REG(nsc, NCR_TCH) : 0, trans, resid)); *sc->sc_dmalen -= trans; *sc->sc_dmaaddr += trans; return 0; } void esp_shutdownhook(void *arg) { struct ncr53c9x_softc *sc = arg; NCRCMD(sc, NCRCMD_RSTSCSI); }