/* $OpenBSD: bpp.c,v 1.2 2001/07/04 08:43:28 niklas Exp $ */ /* * Copyright (c) 1997, Jason Downs. 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 Jason Downs for the * OpenBSD system. * 4. Neither the name(s) of the author(s) nor the name OpenBSD * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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 <sys/param.h> #include <sys/buf.h> #include <sys/kernel.h> #include <sys/uio.h> #include <sys/device.h> #include <sys/conf.h> #include <sys/systm.h> #include <machine/autoconf.h> #include <machine/conf.h> #include <sparc/dev/bppreg.h> #define BPP_BSIZE 1024 #define LONG_TIMEOUT 30 /* XXX */ #define SHORT_TIMEOUT 3 /* XXX */ struct bpp_softc { struct device sc_dev; size_t sc_count; struct buf *sc_inbuf; u_int8_t *sc_cp; char sc_open; volatile struct bppregs *sc_regs; }; static int bppmatch __P((struct device *, void *, void *)); static void bppattach __P((struct device *, struct device *, void *)); #define BPPUNIT(s) minor(s) struct cfattach bpp_ca = { sizeof(struct bpp_softc), bppmatch, bppattach }; struct cfdriver bpp_cd = { NULL, "bpp", DV_DULL }; static __inline__ void bpp_outb __P((struct bpp_softc *, u_int8_t)); static __inline__ u_int8_t bpp_inb __P((struct bpp_softc *)); static void bppreset __P((struct bpp_softc *, int)); static void bppresetmode __P((struct bpp_softc *)); static int bpppushbytes __P((struct bpp_softc *)); static int bppmatch(parent, vcf, aux) struct device *parent; void *aux, *vcf; { register struct confargs *ca = aux; if (strcmp(ca->ca_ra.ra_name, "SUNW,bpp")) return (0); return (1); } static void bppattach(parent, self, aux) struct device *parent, *self; void *aux; { struct confargs *ca = aux; struct romaux *ra = &ca->ca_ra; struct bpp_softc *bpp = (void *)self; bpp->sc_regs = mapiodev(ra->ra_reg, 0, ra->ra_len); bppreset(bpp, 0); switch (bpp->sc_regs->bpp_csr & BPP_DEV_ID_MASK) { case BPP_DEV_ID_ZEBRA: printf(": Zebra\n"); break; case BPP_DEV_ID_L64854: printf(": DMA2\n"); break; default: printf(": Unknown type\n"); break; } bppresetmode(bpp); } static void bppreset(bpp, verbose) struct bpp_softc *bpp; int verbose; { volatile u_int32_t bpp_csr; /* Reset hardware. */ bpp_csr = bpp->sc_regs->bpp_csr; if ((bpp_csr & BPP_DRAINING) && !(bpp_csr & BPP_ERR_PEND)) { delay(20); bpp_csr = bpp->sc_regs->bpp_csr; if (verbose && (bpp_csr & BPP_DRAINING) && !(bpp_csr & BPP_ERR_PEND)) printf("%s: draining still active (0x%08x)\n", bpp->sc_dev.dv_xname, bpp_csr); } bpp->sc_regs->bpp_csr = (bpp_csr | BPP_RESET) & ~BPP_INT_EN; delay(500); bpp->sc_regs->bpp_csr &= ~BPP_RESET; } static void bppresetmode(bpp) struct bpp_softc *bpp; { bpp->sc_regs->bpp_or = BPP_OR_AFXN|BPP_OR_SLCT_IN; bpp->sc_regs->bpp_tcr = BPP_TCR_DS; } static __inline__ void bpp_outb(bpp, byte) struct bpp_softc *bpp; u_int8_t byte; { bpp->sc_regs->bpp_dr = byte; } static __inline__ u_int8_t bpp_inb(bpp) struct bpp_softc *bpp; { return (bpp->sc_regs->bpp_dr); } int bppopen(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { int unit = BPPUNIT(dev); struct bpp_softc *bpp; if (unit >= bpp_cd.cd_ndevs) return (ENXIO); bpp = bpp_cd.cd_devs[unit]; if (!bpp) return (ENXIO); if (bpp->sc_open) return (EBUSY); bpp->sc_inbuf = geteblk(BPP_BSIZE); bpp->sc_count = 0; bpp->sc_open = 1; /* bppreset(bpp, 1); */ bppresetmode(bpp); return (0); } int bppclose(dev, flag, mode, p) dev_t dev; int flag, mode; struct proc *p; { struct bpp_softc *bpp = bpp_cd.cd_devs[BPPUNIT(dev)]; int error = 0; if (bpp->sc_count) (void) bpppushbytes(bpp); /* XXX */ bppresetmode(bpp); delay(100); bppreset(bpp, 1); delay(100); bppresetmode(bpp); brelse(bpp->sc_inbuf); bpp->sc_open = 0; return (error); } int bpppushbytes(bpp) struct bpp_softc *bpp; { int spin, error; while (bpp->sc_count > 0) { error = 0; /* Wait for BPP_TCR_ACK and BPP_TCR_BUSY to clear. */ spin = 0; while ((bpp->sc_regs->bpp_tcr & BPP_TCR_ACK) || (bpp->sc_regs->bpp_tcr & BPP_TCR_BUSY)) { delay(1000); if (++spin >= LONG_TIMEOUT) break; } if ((bpp->sc_regs->bpp_tcr & BPP_TCR_ACK) || (bpp->sc_regs->bpp_tcr & BPP_TCR_BUSY)) return (EBUSY); bpp_outb(bpp, *bpp->sc_cp++); /* Clear BPP_TCR_DS. */ bpp->sc_regs->bpp_tcr &= ~BPP_TCR_DS; /* Short wait for BPP_TCR_BUSY. */ spin = 0; while (!(bpp->sc_regs->bpp_tcr & BPP_TCR_BUSY)) { delay(1000); if (++spin >= SHORT_TIMEOUT) break; } if (!(bpp->sc_regs->bpp_tcr & BPP_TCR_BUSY)) error = EIO; /* Set BPP_TCR_DS. */ bpp->sc_regs->bpp_tcr |= BPP_TCR_DS; if (error) return (error); bpp->sc_count--; } return (error); } int bppwrite(dev, uio, flags) dev_t dev; struct uio *uio; int flags; { struct bpp_softc *bpp = bpp_cd.cd_devs[BPPUNIT(dev)]; size_t n; int error = 0; while ((n = min(BPP_BSIZE, uio->uio_resid)) != 0) { uiomove(bpp->sc_cp = bpp->sc_inbuf->b_data, n, uio); bpp->sc_count = n; error = bpppushbytes(bpp); if (error) { /* * Return accurate residual if interrupted or timed * out. */ uio->uio_resid += bpp->sc_count; bpp->sc_count = 0; return (error); } } return (0); } int bppioctl(dev, cmd, data, flag, p) dev_t dev; u_long cmd; caddr_t data; int flag; struct proc *p; { return (ENODEV); }