sys/dev/powermng/lm/lm78_isa.c

   1 /*
   2  * Copyright (c) 2005, 2006 Mark Kettenis
   3  * Copyright (c) 2007 Constantine A. Murenin, Google Summer of Code
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  *
  17  * $OpenBSD: lm78_isa.c,v 1.2 2007/07/01 21:48:57 cnst Exp $
  18  */
  19
  20 #include <sys/param.h>
  21 #include <sys/kernel.h>
  22 #include <sys/bus.h>
  23 #include <sys/module.h>
  24
  25 #include <sys/module.h>
  26 #include <sys/bus.h>
  27 #include <sys/rman.h>
  28
  29 #include <bus/isa/isavar.h>
  30
  31 #include <sys/systm.h>
  32
  33 #include <sys/sensors.h>
  34
  35 #include "lm78var.h"
  36
  37 /* ISA registers */
  38 #define LMC_ADDR        0x05
  39 #define LMC_DATA        0x06
  40
  41 extern struct cfdriver lm_cd;
  42
  43 #if defined(LMDEBUG)
  44 #define DPRINTF(x)              do { printf x; } while (0)
  45 #else
  46 #define DPRINTF(x)
  47 #endif
  48
  49 struct lm_isa_softc {
  50         struct lm_softc sc_lmsc;
  51
  52         struct resource *sc_iores;
  53         int sc_iorid;
  54         bus_space_tag_t sc_iot;
  55         bus_space_handle_t sc_ioh;
  56 };
  57
  58 static int lm_isa_probe(struct device *);
  59 static int lm_isa_attach(struct device *);
  60 static int lm_isa_detach(struct device *);
  61 u_int8_t lm_isa_readreg(struct lm_softc *, int);
  62 void lm_isa_writereg(struct lm_softc *, int, int);
  63
  64 static device_method_t lm_isa_methods[] = {
  65         /* Methods from the device interface */
  66         DEVMETHOD(device_probe,         lm_isa_probe),
  67         DEVMETHOD(device_attach,        lm_isa_attach),
  68         DEVMETHOD(device_detach,        lm_isa_detach),
  69
  70         /* Terminate method list */
  71         { 0, 0 }
  72 };
  73
  74 static driver_t lm_isa_driver = {
  75         "lm",
  76         lm_isa_methods,
  77         sizeof (struct lm_isa_softc)
  78 };
  79
  80 static devclass_t lm_devclass;
  81
  82 DRIVER_MODULE(lm, isa, lm_isa_driver, lm_devclass, NULL, NULL);
  83
  84 int
  85 lm_isa_probe(struct device *dev)
  86 {
  87         struct lm_isa_softc *sc = device_get_softc(dev);
  88         struct resource *iores;
  89         int iorid = 0;
  90         bus_space_tag_t iot;
  91         bus_space_handle_t ioh;
  92         int banksel, vendid, chipid, addr;
  93
  94         iores = bus_alloc_resource(dev, SYS_RES_IOPORT, &iorid,
  95             0ul, ~0ul, 8, RF_ACTIVE);
  96         if (iores == NULL) {
  97                 DPRINTF(("%s: can't map i/o space\n", __func__));
  98                 return (1);
  99         }
 100         iot = rman_get_bustag(iores);
 101         ioh = rman_get_bushandle(iores);
 102
 103         /* Probe for Winbond chips. */
 104         bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL);
 105         banksel = bus_space_read_1(iot, ioh, LMC_DATA);
 106         bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID);
 107         vendid = bus_space_read_1(iot, ioh, LMC_DATA);
 108         if (((banksel & 0x80) && vendid == (WB_VENDID_WINBOND >> 8)) ||
 109             (!(banksel & 0x80) && vendid == (WB_VENDID_WINBOND & 0xff)))
 110                 goto found;
 111
 112         /* Probe for ITE chips (and don't attach if we find one). */
 113         bus_space_write_1(iot, ioh, LMC_ADDR, 0x58 /*ITD_CHIPID*/);
 114         vendid = bus_space_read_1(iot, ioh, LMC_DATA);
 115         if (vendid == 0x90 /*IT_ID_IT87*/)
 116                 goto notfound;
 117
 118         /*
 119          * Probe for National Semiconductor LM78/79/81.
 120          *
 121          * XXX This assumes the address has not been changed from the
 122          * power up default.  This is probably a reasonable
 123          * assumption, and if it isn't true, we should be able to
 124          * access the chip using the serial bus.
 125          */
 126         bus_space_write_1(iot, ioh, LMC_ADDR, LM_SBUSADDR);
 127         addr = bus_space_read_1(iot, ioh, LMC_DATA);
 128         if ((addr & 0xfc) == 0x2c) {
 129                 bus_space_write_1(iot, ioh, LMC_ADDR, LM_CHIPID);
 130                 chipid = bus_space_read_1(iot, ioh, LMC_DATA);
 131
 132                 switch (chipid & LM_CHIPID_MASK) {
 133                 case LM_CHIPID_LM78:
 134                 case LM_CHIPID_LM78J:
 135                 case LM_CHIPID_LM79:
 136                 case LM_CHIPID_LM81:
 137                         goto found;
 138                 }
 139         }
 140
 141  notfound:
 142         bus_release_resource(dev, SYS_RES_IOPORT, iorid, iores);
 143
 144         return (1);
 145
 146  found:
 147         /* Bus-independent probe */
 148         sc->sc_lmsc.sc_dev = dev;
 149         sc->sc_iot = iot;
 150         sc->sc_ioh = ioh;
 151         sc->sc_lmsc.lm_writereg = lm_isa_writereg;
 152         sc->sc_lmsc.lm_readreg = lm_isa_readreg;
 153         lm_probe(&sc->sc_lmsc);
 154
 155         bus_release_resource(dev, SYS_RES_IOPORT, iorid, iores);
 156         sc->sc_iot = 0;
 157         sc->sc_ioh = 0;
 158
 159         return (0);
 160 }
 161
 162 int
 163 lm_isa_attach(struct device *dev)
 164 {
 165         struct lm_isa_softc *sc = device_get_softc(dev);
 166 #ifdef notyet
 167         struct lm_softc *lmsc;
 168         int i;
 169         u_int8_t sbusaddr;
 170 #endif
 171
 172         sc->sc_iores = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->sc_iorid,
 173             0ul, ~0ul, 8, RF_ACTIVE);
 174         if (sc->sc_iores == NULL) {
 175                 device_printf(dev, "can't map i/o space\n");
 176                 return (1);
 177         }
 178         sc->sc_iot = rman_get_bustag(sc->sc_iores);
 179         sc->sc_ioh = rman_get_bushandle(sc->sc_iores);
 180
 181         /* Bus-independent attachment */
 182         lm_attach(&sc->sc_lmsc);
 183
 184 #ifdef notyet
 185         /*
 186          * Most devices supported by this driver can attach to iic(4)
 187          * as well.  However, we prefer to attach them to isa(4) since
 188          * that causes less overhead and is more reliable.  We look
 189          * through all previously attached devices, and if we find an
 190          * identical chip at the same serial bus address, we stop
 191          * updating its sensors and mark them as invalid.
 192          */
 193
 194         sbusaddr = lm_isa_readreg(&sc->sc_lmsc, LM_SBUSADDR);
 195         if (sbusaddr == 0)
 196                 return (0);
 197
 198         for (i = 0; i < lm_cd.cd_ndevs; i++) {
 199                 lmsc = lm_cd.cd_devs[i];
 200                 if (lmsc == &sc->sc_lmsc)
 201                         continue;
 202                 if (lmsc && lmsc->sbusaddr == sbusaddr &&
 203                     lmsc->chipid == sc->sc_lmsc.chipid)
 204                         config_detach(&lmsc->sc_dev, 0);
 205         }
 206 #endif
 207         return (0);
 208 }
 209
 210 int
 211 lm_isa_detach(struct device *dev)
 212 {
 213         struct lm_isa_softc *sc = device_get_softc(dev);
 214         int error;
 215
 216         /* Bus-independent detachment */
 217         error = lm_detach(&sc->sc_lmsc);
 218         if (error)
 219                 return (error);
 220
 221         error = bus_release_resource(dev, SYS_RES_IOPORT, sc->sc_iorid,
 222             sc->sc_iores);
 223         if (error)
 224                 return (error);
 225
 226         return (0);
 227 }
 228
 229 u_int8_t
 230 lm_isa_readreg(struct lm_softc *lmsc, int reg)
 231 {
 232         struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
 233
 234         bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
 235         return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, LMC_DATA));
 236 }
 237
 238 void
 239 lm_isa_writereg(struct lm_softc *lmsc, int reg, int val)
 240 {
 241         struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
 242
 243         bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
 244         bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_DATA, val);
 245 }