/* $NetBSD: esp.c,v 1.32 2016/07/15 22:10:47 macallan 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 __KERNEL_RCSID(0, "$NetBSD: esp.c,v 1.32 2016/07/15 22:10:47 macallan Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include int espmatch(device_t, cfdata_t, void *); void espattach(device_t, device_t, void *); /* Linkup to the rest of the kernel */ CFATTACH_DECL_NEW(esp, sizeof(struct esp_softc), espmatch, espattach, NULL, NULL); /* * Functions and the switch for the MI code. */ static uint8_t esp_read_reg(struct ncr53c9x_softc *, int); static void esp_write_reg(struct ncr53c9x_softc *, int, uint8_t); static int esp_dma_isintr(struct ncr53c9x_softc *); static void esp_dma_reset(struct ncr53c9x_softc *); static int esp_dma_intr(struct ncr53c9x_softc *); static int esp_dma_setup(struct ncr53c9x_softc *, uint8_t **, size_t *, int, size_t *); static void esp_dma_go(struct ncr53c9x_softc *); static void esp_dma_stop(struct ncr53c9x_softc *); static int esp_dma_isactive(struct ncr53c9x_softc *); static 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 bool esp_shutdown(device_t, int); int espmatch(device_t parent, cfdata_t 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(device_t parent, device_t self, void *aux) { struct esp_softc *esc = device_private(self); struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x; struct confargs *ca = aux; u_int *reg; int sz; /* * Set up glue for MI code early; we use some of it here. */ sc->sc_dev = self; sc->sc_glue = &esp_glue; esc->sc_node = ca->ca_node; esc->sc_pri = ca->ca_intr[0]; aprint_normal(" irq %d", esc->sc_pri); /* * Map my registers in. */ reg = ca->ca_reg; esc->sc_reg = mapiodev(ca->ca_baseaddr + reg[0], reg[1], false); esc->sc_dmareg = mapiodev(ca->ca_baseaddr + reg[2], reg[3], false); /* Allocate 16-byte aligned DMA command space */ esc->sc_dmacmd = dbdma_alloc(sizeof(dbdma_command_t) * 20, NULL); /* 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; /* esc->sc_dma->sc_esp = esc;*/ /* * 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; /* | NCRCFG2_FE */ sc->sc_cfg3 = NCRCFG3_CDB; 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; sc->sc_maxxfer = 64 * 1024; /* and the interuppts */ intr_establish(esc->sc_pri, IST_EDGE, IPL_BIO, ncr53c9x_intr, sc); /* 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; /* Reset SCSI bus when halt. */ if (!pmf_device_register1(self, NULL, NULL, esp_shutdown)) aprint_error_dev(self, "couldn't establish power handler\n"); } /* * Glue functions. */ uint8_t esp_read_reg(struct ncr53c9x_softc *sc, int reg) { struct esp_softc *esc = (struct esp_softc *)sc; return in8(&esc->sc_reg[reg * 16]); /*return (esc->sc_reg[reg * 16]);*/ } void esp_write_reg(struct ncr53c9x_softc *sc, int reg, uint8_t val) { struct esp_softc *esc = (struct esp_softc *)sc; uint8_t v = val; out8(&esc->sc_reg[reg * 16], v); /*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, uint8_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; u_int va; int count, offset; cmdp = esc->sc_dmacmd; cmd = datain ? DBDMA_CMD_IN_MORE : DBDMA_CMD_OUT_MORE; count = *dmasize; if (count / PAGE_SIZE > 32) panic("%s: transfer size >= 128k", device_xname(sc->sc_dev)); esc->sc_dmaaddr = addr; esc->sc_dmalen = len; esc->sc_dmasize = count; va = (u_int)*esc->sc_dmaaddr; offset = va & PGOFSET; /* if va is not page-aligned, setup the first page */ if (offset != 0) { int rest = PAGE_SIZE - offset; /* the rest of the page */ if (count > rest) { /* if continues to next page */ DBDMA_BUILD(cmdp, cmd, 0, rest, kvtop((void *)va), DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); count -= rest; va += rest; cmdp++; } } /* now va is page-aligned */ while (count > PAGE_SIZE) { DBDMA_BUILD(cmdp, cmd, 0, PAGE_SIZE, kvtop((void *)va), DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); count -= PAGE_SIZE; va += PAGE_SIZE; cmdp++; } /* the last page (count <= PAGE_SIZE here) */ cmd = datain ? DBDMA_CMD_IN_LAST : DBDMA_CMD_OUT_LAST; DBDMA_BUILD(cmdp, cmd , 0, count, kvtop((void *)va), DBDMA_INT_NEVER, DBDMA_WAIT_NEVER, DBDMA_BRANCH_NEVER); cmdp++; 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_dmacmd); 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); 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; #if 0 if (csr & D_ERR_PEND) { DMACSR(sc) &= ~D_EN_DMA; /* Stop DMA */ DMACSR(sc) |= D_INVALIDATE; snprintb(bits, sizeof(bits), DMACSRBITS, csr); printf("%s: error: csr=%s\n", device_xname(nsc->sc_dev), bits); return -1; } #endif /* This is an "assertion" :) */ if (sc->sc_dmaactive == 0) panic("%s: DMA wasn't active", __func__); /* dbdma_flush(sc->sc_dmareg); */ /* DMA has stopped */ dbdma_stop(sc->sc_dmareg); 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 ? */ #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(nsc->sc_dev), trans, sc->sc_dmasize); #endif 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)); #if 0 if (csr & D_WRITE) flushcache(*sc->sc_dmaaddr, trans); #endif *sc->sc_dmalen -= trans; *sc->sc_dmaaddr += trans; #if 0 /* this is not normal operation just yet */ if (*sc->sc_dmalen == 0 || nsc->sc_phase != nsc->sc_prevphase) return 0; /* and again */ dma_start(sc, sc->sc_dmaaddr, sc->sc_dmalen, DMACSR(sc) & D_WRITE); return 1; #endif return 0; } bool esp_shutdown(device_t self, int howto) { struct esp_softc *esc; struct ncr53c9x_softc *sc; esc = device_private(self); sc = &esc->sc_ncr53c9x; NCRCMD(sc, NCRCMD_RSTSCSI); return true; }