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      1 /*	$NetBSD: i82072.c,v 1.15 2014/07/25 08:10:34 dholland Exp $	*/
      2 /*-
      3  * Copyright (c) 2000 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Wayne Knowles
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     20  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     21  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     22  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     23  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     24  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     25  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     26  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: i82072.c,v 1.15 2014/07/25 08:10:34 dholland Exp $");
     33 
     34 #include <sys/param.h>
     35 #include <sys/systm.h>
     36 #include <sys/mbuf.h>
     37 #include <sys/syslog.h>
     38 #include <sys/socket.h>
     39 #include <sys/device.h>
     40 #include <sys/conf.h>
     41 #include <sys/event.h>
     42 
     43 #include <machine/cpu.h>
     44 #include <machine/autoconf.h>
     45 #include <machine/mainboard.h>
     46 #include <machine/bus.h>
     47 
     48 dev_type_open(fdopen);
     49 dev_type_strategy(fdstrategy);
     50 
     51 const struct bdevsw fd_bdevsw = {
     52 	.d_open = fdopen,
     53 	.d_close = nullclose,
     54 	.d_strategy = fdstrategy,
     55 	.d_ioctl = noioctl,
     56 	.d_dump = nodump,
     57 	.d_psize = nosize,
     58 	.d_discard = nodiscard,
     59 	.d_flag = D_DISK
     60 };
     61 
     62 const struct cdevsw fd_cdevsw = {
     63 	.d_open = fdopen,
     64 	.d_close = nullclose,
     65 	.d_read = noread,
     66 	.d_write = nowrite,
     67 	.d_ioctl = noioctl,
     68 	.d_stop = nostop,
     69 	.d_tty = notty,
     70 	.d_poll = nopoll,
     71 	.d_mmap = nommap,
     72 	.d_kqfilter = nokqfilter,
     73 	.d_discard = nodiscard,
     74 	.d_flag = D_DISK
     75 };
     76 
     77 #define	I82072_STATUS	0x000003
     78 #define	I82072_DATA	0x000007
     79 #define	I82072_TC	0x800003
     80 
     81 struct	fd_softc {
     82         device_t dev;
     83         struct  evcnt  fd_intrcnt;
     84 	bus_space_tag_t	fd_bst;
     85 	bus_space_handle_t fd_bsh;
     86         int     unit;
     87 };
     88 
     89 static int	fd_match (device_t, cfdata_t, void *);
     90 static void	fd_attach (device_t, device_t, void *);
     91 static void     fd_reset (struct fd_softc *);
     92 
     93 CFATTACH_DECL_NEW(fd, sizeof(struct fd_softc),
     94     fd_match, fd_attach, NULL, NULL);
     95 
     96 static int	fd_intr (void *);
     97 
     98 int
     99 fd_match(device_t parent, cfdata_t cf, void *aux)
    100 {
    101 	return 1;
    102 }
    103 
    104 void
    105 fd_attach(device_t parent, device_t self, void *aux)
    106 {
    107         struct fd_softc *sc = device_private(self);
    108 	struct confargs *ca = aux;
    109 
    110 	sc->fd_bst = ca->ca_bustag;
    111 	if (bus_space_map(ca->ca_bustag, ca->ca_addr,
    112 			  0x1000000,
    113 			  BUS_SPACE_MAP_LINEAR,
    114 			  &sc->fd_bsh) != 0) {
    115 		printf("%s: cannot map registers\n", device_xname(self));
    116 		return;
    117 	}
    118 	evcnt_attach_dynamic(&sc->fd_intrcnt, EVCNT_TYPE_INTR, NULL,
    119 			     device_xname(self), "intr");
    120 
    121 	bus_intr_establish(sc->fd_bst, SYS_INTR_FDC, 0, 0, fd_intr, sc);
    122 
    123 	fd_reset(sc);
    124 	printf(": not fully implemented\n");
    125 }
    126 
    127 void
    128 fd_reset(struct fd_softc *sc)
    129 {
    130 	/* This clears any pending interrupts from the i82072 FDC */
    131 	bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_STATUS, 0x80);
    132 	DELAY(1000);
    133 	bus_space_write_1(sc->fd_bst, sc->fd_bsh, I82072_TC, 0x01);
    134 	DELAY(1000);
    135 }
    136 
    137 int
    138 fdopen(dev_t dev, int flags, int mode, struct lwp *l)
    139 {
    140 	return (EBADF);
    141 }
    142 
    143 void
    144 fdstrategy(struct buf *bp)
    145 {
    146 	panic("fdstrategy");
    147 }
    148 
    149 static int
    150 fd_intr(void *arg)
    151 {
    152 	struct fd_softc *sc = arg;
    153 
    154 	sc->fd_intrcnt.ev_count++;
    155 	fd_reset(sc);
    156 	return 0;
    157 }
    158