Annotation of sys/dev/isa/lm78_isa.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: lm78_isa.c,v 1.2 2007/07/01 21:48:57 cnst Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2005, 2006 Mark Kettenis
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #include <sys/param.h>
! 20: #include <sys/systm.h>
! 21: #include <sys/device.h>
! 22: #include <sys/sensors.h>
! 23: #include <machine/bus.h>
! 24:
! 25: #include <dev/isa/isareg.h>
! 26: #include <dev/isa/isavar.h>
! 27:
! 28: #include <dev/ic/lm78var.h>
! 29: #include <dev/isa/itvar.h>
! 30:
! 31: /* ISA registers */
! 32: #define LMC_ADDR 0x05
! 33: #define LMC_DATA 0x06
! 34:
! 35: extern struct cfdriver lm_cd;
! 36:
! 37: #if defined(LMDEBUG)
! 38: #define DPRINTF(x) do { printf x; } while (0)
! 39: #else
! 40: #define DPRINTF(x)
! 41: #endif
! 42:
! 43: struct lm_isa_softc {
! 44: struct lm_softc sc_lmsc;
! 45:
! 46: bus_space_tag_t sc_iot;
! 47: bus_space_handle_t sc_ioh;
! 48: };
! 49:
! 50: int lm_isa_match(struct device *, void *, void *);
! 51: void lm_isa_attach(struct device *, struct device *, void *);
! 52: u_int8_t lm_isa_readreg(struct lm_softc *, int);
! 53: void lm_isa_writereg(struct lm_softc *, int, int);
! 54:
! 55: struct cfattach lm_isa_ca = {
! 56: sizeof(struct lm_isa_softc),
! 57: lm_isa_match,
! 58: lm_isa_attach
! 59: };
! 60:
! 61: int
! 62: lm_isa_match(struct device *parent, void *match, void *aux)
! 63: {
! 64: bus_space_tag_t iot;
! 65: bus_addr_t iobase;
! 66: bus_space_handle_t ioh;
! 67: struct isa_attach_args *ia = aux;
! 68: int banksel, vendid, chipid, addr;
! 69:
! 70: iot = ia->ia_iot;
! 71: iobase = ia->ipa_io[0].base;
! 72:
! 73: if (bus_space_map(iot, iobase, 8, 0, &ioh)) {
! 74: DPRINTF(("%s: can't map i/o space\n", __func__));
! 75: return (0);
! 76: }
! 77:
! 78: /* Probe for Winbond chips. */
! 79: bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL);
! 80: banksel = bus_space_read_1(iot, ioh, LMC_DATA);
! 81: bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID);
! 82: vendid = bus_space_read_1(iot, ioh, LMC_DATA);
! 83: if (((banksel & 0x80) && vendid == (WB_VENDID_WINBOND >> 8)) ||
! 84: (!(banksel & 0x80) && vendid == (WB_VENDID_WINBOND & 0xff)))
! 85: goto found;
! 86:
! 87: /* Probe for ITE chips (and don't attach if we find one). */
! 88: bus_space_write_1(iot, ioh, LMC_ADDR, ITD_CHIPID);
! 89: vendid = bus_space_read_1(iot, ioh, LMC_DATA);
! 90: if (vendid == IT_ID_IT87)
! 91: goto notfound;
! 92:
! 93: /*
! 94: * Probe for National Semiconductor LM78/79/81.
! 95: *
! 96: * XXX This assumes the address has not been changed from the
! 97: * power up default. This is probably a reasonable
! 98: * assumption, and if it isn't true, we should be able to
! 99: * access the chip using the serial bus.
! 100: */
! 101: bus_space_write_1(iot, ioh, LMC_ADDR, LM_SBUSADDR);
! 102: addr = bus_space_read_1(iot, ioh, LMC_DATA);
! 103: if ((addr & 0xfc) == 0x2c) {
! 104: bus_space_write_1(iot, ioh, LMC_ADDR, LM_CHIPID);
! 105: chipid = bus_space_read_1(iot, ioh, LMC_DATA);
! 106:
! 107: switch (chipid & LM_CHIPID_MASK) {
! 108: case LM_CHIPID_LM78:
! 109: case LM_CHIPID_LM78J:
! 110: case LM_CHIPID_LM79:
! 111: case LM_CHIPID_LM81:
! 112: goto found;
! 113: }
! 114: }
! 115:
! 116: notfound:
! 117: bus_space_unmap(iot, ioh, 8);
! 118:
! 119: return (0);
! 120:
! 121: found:
! 122: bus_space_unmap(iot, ioh, 8);
! 123:
! 124: ia->ipa_nio = 1;
! 125: ia->ipa_io[0].length = 8;
! 126:
! 127: ia->ipa_nmem = 0;
! 128: ia->ipa_nirq = 0;
! 129: ia->ipa_ndrq = 0;
! 130:
! 131: return (1);
! 132: }
! 133:
! 134: void
! 135: lm_isa_attach(struct device *parent, struct device *self, void *aux)
! 136: {
! 137: struct lm_isa_softc *sc = (struct lm_isa_softc *)self;
! 138: struct isa_attach_args *ia = aux;
! 139: struct lm_softc *lmsc;
! 140: bus_addr_t iobase;
! 141: int i;
! 142: u_int8_t sbusaddr;
! 143:
! 144: sc->sc_iot = ia->ia_iot;
! 145: iobase = ia->ipa_io[0].base;
! 146:
! 147: if (bus_space_map(sc->sc_iot, iobase, 8, 0, &sc->sc_ioh)) {
! 148: printf(": can't map i/o space\n");
! 149: return;
! 150: }
! 151:
! 152: /* Bus-independant attachment */
! 153: sc->sc_lmsc.lm_writereg = lm_isa_writereg;
! 154: sc->sc_lmsc.lm_readreg = lm_isa_readreg;
! 155: lm_attach(&sc->sc_lmsc);
! 156:
! 157: /*
! 158: * Most devices supported by this driver can attach to iic(4)
! 159: * as well. However, we prefer to attach them to isa(4) since
! 160: * that causes less overhead and is more reliable. We look
! 161: * through all previously attached devices, and if we find an
! 162: * identical chip at the same serial bus address, we stop
! 163: * updating its sensors and mark them as invalid.
! 164: */
! 165:
! 166: sbusaddr = lm_isa_readreg(&sc->sc_lmsc, LM_SBUSADDR);
! 167: if (sbusaddr == 0)
! 168: return;
! 169:
! 170: for (i = 0; i < lm_cd.cd_ndevs; i++) {
! 171: lmsc = lm_cd.cd_devs[i];
! 172: if (lmsc == &sc->sc_lmsc)
! 173: continue;
! 174: if (lmsc && lmsc->sbusaddr == sbusaddr &&
! 175: lmsc->chipid == sc->sc_lmsc.chipid)
! 176: config_detach(&lmsc->sc_dev, 0);
! 177: }
! 178: }
! 179:
! 180: u_int8_t
! 181: lm_isa_readreg(struct lm_softc *lmsc, int reg)
! 182: {
! 183: struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
! 184:
! 185: bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
! 186: return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, LMC_DATA));
! 187: }
! 188:
! 189: void
! 190: lm_isa_writereg(struct lm_softc *lmsc, int reg, int val)
! 191: {
! 192: struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
! 193:
! 194: bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
! 195: bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_DATA, val);
! 196: }
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