Annotation of sys/arch/mvme88k/dev/sram.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sram.c,v 1.18 2006/04/26 21:09:48 miod Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 1995 Theo de Raadt
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 17: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 18: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 19: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 20: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 21: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 22: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 23: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 24: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 25: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 26: */
! 27:
! 28: #include <sys/param.h>
! 29: #include <sys/ioctl.h>
! 30: #include <sys/buf.h>
! 31: #include <sys/systm.h>
! 32: #include <sys/uio.h>
! 33: #include <sys/malloc.h>
! 34: #include <sys/device.h>
! 35:
! 36: #include <machine/autoconf.h>
! 37: #include <machine/conf.h>
! 38: #include <machine/cpu.h>
! 39: #include <machine/mioctl.h>
! 40:
! 41: #include <mvme88k/dev/memdevs.h>
! 42:
! 43: #include <uvm/uvm_extern.h>
! 44:
! 45: struct sramsoftc {
! 46: struct device sc_dev;
! 47: paddr_t sc_base;
! 48: size_t sc_len;
! 49: bus_space_tag_t sc_iot;
! 50: bus_space_handle_t sc_ioh;
! 51: };
! 52:
! 53: void sramattach(struct device *, struct device *, void *);
! 54: int srammatch(struct device *, void *, void *);
! 55:
! 56: struct cfattach sram_ca = {
! 57: sizeof(struct sramsoftc), srammatch, sramattach
! 58: };
! 59:
! 60: struct cfdriver sram_cd = {
! 61: NULL, "sram", DV_DULL
! 62: };
! 63:
! 64: int
! 65: srammatch(parent, vcf, args)
! 66: struct device *parent;
! 67: void *vcf, *args;
! 68: {
! 69: if (brdtyp != BRD_187 && brdtyp != BRD_8120) /* The only ones... */
! 70: return (0);
! 71:
! 72: return (1);
! 73: }
! 74:
! 75: void
! 76: sramattach(parent, self, args)
! 77: struct device *parent, *self;
! 78: void *args;
! 79: {
! 80: struct confargs *ca = args;
! 81: struct sramsoftc *sc = (struct sramsoftc *)self;
! 82: bus_space_handle_t ioh;
! 83:
! 84: sc->sc_iot = ca->ca_iot;
! 85: sc->sc_base = ca->ca_paddr;
! 86: sc->sc_len = 128 * 1024; /* always 128K */
! 87:
! 88: if (bus_space_map(sc->sc_iot, sc->sc_base, sc->sc_len,
! 89: BUS_SPACE_MAP_LINEAR, &ioh) != 0) {
! 90: printf(": can't map memory!\n");
! 91: return;
! 92: }
! 93:
! 94: sc->sc_ioh = ioh;
! 95:
! 96: printf(": %dKB\n", sc->sc_len / 1024);
! 97: }
! 98:
! 99: /*ARGSUSED*/
! 100: int
! 101: sramopen(dev, flag, mode, p)
! 102: dev_t dev;
! 103: int flag, mode;
! 104: struct proc *p;
! 105: {
! 106: if (minor(dev) >= sram_cd.cd_ndevs ||
! 107: sram_cd.cd_devs[minor(dev)] == NULL)
! 108: return (ENODEV);
! 109: return (0);
! 110: }
! 111:
! 112: /*ARGSUSED*/
! 113: int
! 114: sramclose(dev, flag, mode, p)
! 115: dev_t dev;
! 116: int flag, mode;
! 117: struct proc *p;
! 118: {
! 119:
! 120: return (0);
! 121: }
! 122:
! 123: /*ARGSUSED*/
! 124: int
! 125: sramioctl(dev, cmd, data, flag, p)
! 126: dev_t dev;
! 127: u_long cmd;
! 128: caddr_t data;
! 129: int flag;
! 130: struct proc *p;
! 131: {
! 132: int unit = minor(dev);
! 133: struct sramsoftc *sc = (struct sramsoftc *) sram_cd.cd_devs[unit];
! 134: int error = 0;
! 135:
! 136: switch (cmd) {
! 137: case MIOCGSIZ:
! 138: *(int *)data = sc->sc_len;
! 139: break;
! 140: default:
! 141: error = ENOTTY;
! 142: break;
! 143: }
! 144: return (error);
! 145: }
! 146:
! 147: /*ARGSUSED*/
! 148: int
! 149: sramrw(dev, uio, flags)
! 150: dev_t dev;
! 151: struct uio *uio;
! 152: int flags;
! 153: {
! 154: int unit = minor(dev);
! 155: struct sramsoftc *sc = (struct sramsoftc *) sram_cd.cd_devs[unit];
! 156:
! 157: return memdevrw(bus_space_vaddr(sc->sc_iot, sc->sc_ioh),
! 158: sc->sc_len, uio, flags);
! 159: }
! 160:
! 161: paddr_t
! 162: srammmap(dev, off, prot)
! 163: dev_t dev;
! 164: off_t off;
! 165: int prot;
! 166: {
! 167: int unit = minor(dev);
! 168: struct sramsoftc *sc = (struct sramsoftc *) sram_cd.cd_devs[unit];
! 169:
! 170: if (minor(dev) != 0)
! 171: return (-1);
! 172:
! 173: /* allow access only in RAM */
! 174: if (off < 0 || off > sc->sc_len)
! 175: return (-1);
! 176: return (atop(sc->sc_base + off));
! 177: }
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