/* $NetBSD: esp.c,v 1.17 2002/10/02 16:02:25 thorpej Exp $ */ /*- * Copyright (c) 1997 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jeremy Cooper 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. * 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. */ /* * "Front end" glue for the ncr53c9x chip, formerly known as the * Emulex SCSI Processor (ESP) which is what we actually have. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define ESP_REG_SIZE (12*4) struct esp_softc { struct ncr53c9x_softc sc_ncr53c9x; /* glue to MI code */ volatile u_char *sc_reg; /* the registers */ struct dma_softc *sc_dma; /* pointer to my dma */ }; static int espmatch __P((struct device *, struct cfdata *, void *)); static void espattach __P((struct device *, struct device *, void *)); CFATTACH_DECL(esp, sizeof(struct esp_softc), espmatch, espattach, NULL, NULL); /* * Functions and the switch for the MI code. */ static u_char esp_read_reg __P((struct ncr53c9x_softc *, int)); static void esp_write_reg __P((struct ncr53c9x_softc *, int, u_char)); static int esp_dma_isintr __P((struct ncr53c9x_softc *)); static void esp_dma_reset __P((struct ncr53c9x_softc *)); static int esp_dma_intr __P((struct ncr53c9x_softc *)); static int esp_dma_setup __P((struct ncr53c9x_softc *, caddr_t *, size_t *, int, size_t *)); static void esp_dma_go __P((struct ncr53c9x_softc *)); static void esp_dma_stop __P((struct ncr53c9x_softc *)); static int esp_dma_isactive __P((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 espmatch(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct confargs *ca = aux; /* * Check for the esp registers. */ if (bus_peek(ca->ca_bustype, ca->ca_paddr + (NCR_STAT * 4), 1) == -1) return (0); /* If default ipl, fill it in. */ if (ca->ca_intpri == -1) ca->ca_intpri = 2; return (1); } static void espattach(parent, self, aux) struct device *parent, *self; void *aux; { struct confargs *ca = aux; struct esp_softc *esc = (void *)self; struct ncr53c9x_softc *sc = &esc->sc_ncr53c9x; /* * Set up glue for MI code early; we use some of it here. */ sc->sc_glue = &esp_glue; /* * Map in the ESP registers. */ esc->sc_reg = bus_mapin(ca->ca_bustype, ca->ca_paddr, ESP_REG_SIZE); /* Other settings */ sc->sc_id = 7; sc->sc_freq = 20; /* The 3/80 esp runs at 20 Mhz */ /* * Hook up the DMA driver. */ esc->sc_dma = espdmafind(sc->sc_dev.dv_unit); esc->sc_dma->sc_esp = sc; /* Point back to us */ /* * 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... */ /* * It is necessary to try to load the 2nd config register here, * to find out what rev the esp chip is, else the ncr53c9x_reset * will not set up the defaults correctly. */ sc->sc_cfg1 = sc->sc_id | NCRCFG1_PARENB; sc->sc_cfg2 = NCRCFG2_SCSI2 | NCRCFG2_RPE; sc->sc_cfg3 = NCRCFG3_CDB; NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2); if ((NCR_READ_REG(sc, NCR_CFG2) & ~NCRCFG2_RSVD) != (NCRCFG2_SCSI2 | NCRCFG2_RPE)) { sc->sc_rev = NCR_VARIANT_ESP100; } else { sc->sc_cfg2 = NCRCFG2_SCSI2; NCR_WRITE_REG(sc, NCR_CFG2, sc->sc_cfg2); sc->sc_cfg3 = 0; NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); sc->sc_cfg3 = (NCRCFG3_CDB | NCRCFG3_FCLK); NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); if (NCR_READ_REG(sc, NCR_CFG3) != (NCRCFG3_CDB | NCRCFG3_FCLK)) { sc->sc_rev = NCR_VARIANT_ESP100A; } else { /* NCRCFG2_FE enables > 64K transfers */ sc->sc_cfg2 |= NCRCFG2_FE; sc->sc_cfg3 = 0; NCR_WRITE_REG(sc, NCR_CFG3, sc->sc_cfg3); sc->sc_rev = NCR_VARIANT_ESP200; } } /* * 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; /* * Alas, we must now modify the value a bit, because it's * only valid when can switch on FASTCLK and FASTSCSI bits * in config register 3... */ switch (sc->sc_rev) { case NCR_VARIANT_ESP100: sc->sc_maxxfer = 64 * 1024; sc->sc_minsync = 0; /* No synch on old chip? */ break; case NCR_VARIANT_ESP100A: sc->sc_maxxfer = 64 * 1024; /* Min clocks/byte is 5 */ sc->sc_minsync = ncr53c9x_cpb2stp(sc, 5); break; case NCR_VARIANT_ESP200: sc->sc_maxxfer = 16 * 1024 * 1024; /* XXX - do actually set FAST* bits */ break; } /* and the interuppts */ isr_add_autovect(ncr53c9x_intr, sc, ca->ca_intpri); evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, NULL, sc->sc_dev.dv_xname, "intr"); /* Do the common parts of attachment. */ sc->sc_adapter.adapt_minphys = minphys; sc->sc_adapter.adapt_request = ncr53c9x_scsipi_request; ncr53c9x_attach(sc); #if 0 /* XXX - This doesn't work yet. Not sure why... */ /* Turn on target selection using the `dma' method */ sc->sc_features |= NCR_F_DMASELECT; /* XXX - OK? */ #endif } /* * Glue functions. */ u_char esp_read_reg(sc, reg) struct ncr53c9x_softc *sc; int reg; { struct esp_softc *esc = (struct esp_softc *)sc; return (esc->sc_reg[reg * 4]); } void esp_write_reg(sc, reg, val) struct ncr53c9x_softc *sc; int reg; u_char val; { struct esp_softc *esc = (struct esp_softc *)sc; esc->sc_reg[reg * 4] = val; } int esp_dma_isintr(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; u_int32_t csr; csr = DMACSR(esc->sc_dma); return (csr & (D_INT_PEND|D_ERR_PEND)); } void esp_dma_reset(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; dma_reset(esc->sc_dma); } int esp_dma_intr(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; return (espdmaintr(esc->sc_dma)); } int esp_dma_setup(sc, addr, len, datain, dmasize) struct ncr53c9x_softc *sc; caddr_t *addr; size_t *len; int datain; size_t *dmasize; { struct esp_softc *esc = (struct esp_softc *)sc; return (dma_setup(esc->sc_dma, addr, len, datain, dmasize)); } void esp_dma_go(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; /* Start DMA */ DMACSR(esc->sc_dma) |= D_EN_DMA; esc->sc_dma->sc_active = 1; } void esp_dma_stop(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; DMACSR(esc->sc_dma) &= ~D_EN_DMA; } int esp_dma_isactive(sc) struct ncr53c9x_softc *sc; { struct esp_softc *esc = (struct esp_softc *)sc; return (esc->sc_dma->sc_active); }