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rs5c313_landisk.c revision 1.3 
      1 /*	$NetBSD: rs5c313_landisk.c,v 1.3 2008/03/27 02:15:29 uwe Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2002 The NetBSD Foundation, Inc.
      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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *        This product includes software developed by the NetBSD
     18  *        Foundation, Inc. and its contributors.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: rs5c313_landisk.c,v 1.3 2008/03/27 02:15:29 uwe Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/device.h>
     39 #include <sys/kernel.h>
     40 
     41 #include <dev/clock_subr.h>
     42 #include <dev/ic/rs5c313var.h>
     43 
     44 #include <sh3/devreg.h>
     45 #include <sh3/scireg.h>
     46 
     47 #include <landisk/landisk/landiskreg.h>
     48 
     49 
     50 /* autoconf glue */
     51 static int rs5c313_landisk_match(device_t, cfdata_t, void *);
     52 static void rs5c313_landisk_attach(device_t, device_t, void *);
     53 
     54 CFATTACH_DECL_NEW(rs5c313_landisk, sizeof(struct rs5c313_softc),
     55     rs5c313_landisk_match, rs5c313_landisk_attach, NULL, NULL);
     56 
     57 
     58 /* chip access methods */
     59 static void rtc_begin(struct rs5c313_softc *);
     60 static void rtc_ce(struct rs5c313_softc *, int);
     61 static void rtc_dir(struct rs5c313_softc *, int);
     62 static void rtc_clk(struct rs5c313_softc *, int);
     63 static int  rtc_read(struct rs5c313_softc *);
     64 static void rtc_write(struct rs5c313_softc *, int);
     65 
     66 static struct rs5c313_ops rs5c313_landisk_ops = {
     67 	.rs5c313_op_begin = rtc_begin,
     68 	.rs5c313_op_ce    = rtc_ce,
     69 	.rs5c313_op_clk   = rtc_clk,
     70 	.rs5c313_op_dir   = rtc_dir,
     71 	.rs5c313_op_read  = rtc_read,
     72 	.rs5c313_op_write = rtc_write,
     73 };
     74 
     75 #define ndelay(x) delay(x)
     76 
     77 
     78 
     79 static int
     80 rs5c313_landisk_match(device_t parent, cfdata_t cf, void *aux)
     81 {
     82 	static int matched = 0;
     83 
     84 	if (matched)
     85 		return 0;
     86 
     87 	matched = 1;
     88 	return 1;
     89 }
     90 
     91 
     92 static void
     93 rs5c313_landisk_attach(device_t parent, device_t self, void *aux)
     94 {
     95 	struct rs5c313_softc *sc = device_private(self);
     96 
     97 	sc->sc_dev = self;
     98 	sc->sc_ops = &rs5c313_landisk_ops;
     99 	rs5c313_attach(sc);
    100 }
    101 
    102 
    103 static void
    104 rtc_begin(struct rs5c313_softc *sc)
    105 {
    106 
    107 	SHREG_SCSPTR = SCSPTR_SPB1IO | SCSPTR_SPB1DT
    108 		     | SCSPTR_SPB0IO | SCSPTR_SPB0DT;
    109 	ndelay(100);
    110 }
    111 
    112 
    113 /*
    114  * CE pin
    115  */
    116 static void
    117 rtc_ce(struct rs5c313_softc *sc, int onoff)
    118 {
    119 
    120 	if (onoff)
    121 		_reg_write_1(LANDISK_PWRMNG, PWRMNG_RTC_CE);
    122 	else
    123 		_reg_write_1(LANDISK_PWRMNG, 0);
    124 	ndelay(600);
    125 }
    126 
    127 
    128 /*
    129  * SCLK pin is connnected to SPB0DT.
    130  * SPB0DT is always in output mode, we set SPB0IO in rtc_begin.
    131  */
    132 static void
    133 rtc_clk(struct rs5c313_softc *sc, int onoff)
    134 {
    135 	uint8_t r = SHREG_SCSPTR;
    136 
    137 	if (onoff)
    138 		r |= SCSPTR_SPB0DT;
    139 	else
    140 		r &= ~SCSPTR_SPB0DT;
    141 	SHREG_SCSPTR = r;
    142 }
    143 
    144 
    145 /*
    146  * SIO pin is connected to SPB1DT.
    147  * SPB1DT is output when SPB1IO is set.
    148  */
    149 static void
    150 rtc_dir(struct rs5c313_softc *sc, int output)
    151 {
    152 	uint8_t r = SHREG_SCSPTR;
    153 
    154 	if (output)
    155 		r |= SCSPTR_SPB1IO;
    156 	else
    157 		r &= ~SCSPTR_SPB1IO;
    158 	SHREG_SCSPTR = r;
    159 }
    160 
    161 
    162 /*
    163  * Read bit from SPB1DT pin.
    164  */
    165 static int
    166 rtc_read(struct rs5c313_softc *sc)
    167 {
    168 	int bit;
    169 
    170 	ndelay(300);
    171 
    172 	bit = (SHREG_SCSPTR & SCSPTR_SPB1DT) ? 1 : 0;
    173 
    174 	rtc_clk(sc, 0);
    175 	ndelay(300);
    176 	rtc_clk(sc, 1);
    177 
    178 	return bit;
    179 }
    180 
    181 
    182 /*
    183  * Write bit via SPB1DT pin.
    184  */
    185 static void
    186 rtc_write(struct rs5c313_softc *sc, int bit)
    187 {
    188 	uint8_t r = SHREG_SCSPTR;
    189 
    190 	if (bit)
    191 		r |= SCSPTR_SPB1DT;
    192 	else
    193 		r &= ~SCSPTR_SPB1DT;
    194 	SHREG_SCSPTR = r;
    195 
    196 	ndelay(300);
    197 
    198 	rtc_clk(sc, 0);
    199 	ndelay(300);
    200 	rtc_clk(sc, 1);
    201 }
    202