2 * Copyright (c) 2005, 2006 Mark Kettenis
3 * Copyright (c) 2007 Constantine A. Murenin, Google Summer of Code
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.
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.
17 * $OpenBSD: lm78_isa.c,v 1.2 2007/07/01 21:48:57 cnst Exp $
20 #include <sys/param.h>
21 #include <sys/kernel.h>
23 #include <sys/module.h>
25 #include <sys/module.h>
29 #include <bus/isa/isavar.h>
31 #include <sys/systm.h>
33 #include <sys/sensors.h>
42 #define DPRINTF(x) do { kprintf x; } while (0)
48 struct lm_softc sc_lmsc;
50 struct resource *sc_iores;
52 bus_space_tag_t sc_iot;
53 bus_space_handle_t sc_ioh;
56 static int lm_isa_probe(struct device *);
57 static int lm_isa_attach(struct device *);
58 static int lm_isa_detach(struct device *);
59 u_int8_t lm_isa_readreg(struct lm_softc *, int);
60 void lm_isa_writereg(struct lm_softc *, int, int);
62 static device_method_t lm_isa_methods[] = {
63 /* Methods from the device interface */
64 DEVMETHOD(device_probe, lm_isa_probe),
65 DEVMETHOD(device_attach, lm_isa_attach),
66 DEVMETHOD(device_detach, lm_isa_detach),
68 /* Terminate method list */
72 static driver_t lm_isa_driver = {
75 sizeof (struct lm_isa_softc)
78 static devclass_t lm_devclass;
80 DRIVER_MODULE(lm, isa, lm_isa_driver, lm_devclass, NULL, NULL);
83 lm_isa_probe(struct device *dev)
85 struct lm_isa_softc *sc = device_get_softc(dev);
86 struct resource *iores;
89 bus_space_handle_t ioh;
90 int banksel, vendid, chipid, addr;
92 iores = bus_alloc_resource(dev, SYS_RES_IOPORT, &iorid,
93 0ul, ~0ul, 8, RF_ACTIVE);
95 DPRINTF(("%s: can't map i/o space\n", __func__));
98 iot = rman_get_bustag(iores);
99 ioh = rman_get_bushandle(iores);
101 /* Probe for Winbond chips. */
102 bus_space_write_1(iot, ioh, LMC_ADDR, WB_BANKSEL);
103 banksel = bus_space_read_1(iot, ioh, LMC_DATA);
104 bus_space_write_1(iot, ioh, LMC_ADDR, WB_VENDID);
105 vendid = bus_space_read_1(iot, ioh, LMC_DATA);
106 if (((banksel & 0x80) && vendid == (WB_VENDID_WINBOND >> 8)) ||
107 (!(banksel & 0x80) && vendid == (WB_VENDID_WINBOND & 0xff)))
110 /* Probe for ITE chips (and don't attach if we find one). */
111 bus_space_write_1(iot, ioh, LMC_ADDR, 0x58 /*ITD_CHIPID*/);
112 vendid = bus_space_read_1(iot, ioh, LMC_DATA);
113 if (vendid == 0x90 /*IT_ID_IT87*/)
117 * Probe for National Semiconductor LM78/79/81.
119 * XXX This assumes the address has not been changed from the
120 * power up default. This is probably a reasonable
121 * assumption, and if it isn't true, we should be able to
122 * access the chip using the serial bus.
124 bus_space_write_1(iot, ioh, LMC_ADDR, LM_SBUSADDR);
125 addr = bus_space_read_1(iot, ioh, LMC_DATA);
126 if ((addr & 0xfc) == 0x2c) {
127 bus_space_write_1(iot, ioh, LMC_ADDR, LM_CHIPID);
128 chipid = bus_space_read_1(iot, ioh, LMC_DATA);
130 switch (chipid & LM_CHIPID_MASK) {
132 case LM_CHIPID_LM78J:
140 bus_release_resource(dev, SYS_RES_IOPORT, iorid, iores);
145 /* Bus-independent probe */
146 sc->sc_lmsc.sc_dev = dev;
149 sc->sc_lmsc.lm_writereg = lm_isa_writereg;
150 sc->sc_lmsc.lm_readreg = lm_isa_readreg;
151 lm_probe(&sc->sc_lmsc);
153 bus_release_resource(dev, SYS_RES_IOPORT, iorid, iores);
161 lm_isa_attach(struct device *dev)
163 struct lm_isa_softc *sc = device_get_softc(dev);
165 struct lm_softc *lmsc;
170 sc->sc_iores = bus_alloc_resource(dev, SYS_RES_IOPORT, &sc->sc_iorid,
171 0ul, ~0ul, 8, RF_ACTIVE);
172 if (sc->sc_iores == NULL) {
173 device_printf(dev, "can't map i/o space\n");
176 sc->sc_iot = rman_get_bustag(sc->sc_iores);
177 sc->sc_ioh = rman_get_bushandle(sc->sc_iores);
179 /* Bus-independent attachment */
180 lm_attach(&sc->sc_lmsc);
184 * Most devices supported by this driver can attach to iic(4)
185 * as well. However, we prefer to attach them to isa(4) since
186 * that causes less overhead and is more reliable. We look
187 * through all previously attached devices, and if we find an
188 * identical chip at the same serial bus address, we stop
189 * updating its sensors and mark them as invalid.
192 sbusaddr = lm_isa_readreg(&sc->sc_lmsc, LM_SBUSADDR);
196 for (i = 0; i < lm_cd.cd_ndevs; i++) {
197 lmsc = lm_cd.cd_devs[i];
198 if (lmsc == &sc->sc_lmsc)
200 if (lmsc && lmsc->sbusaddr == sbusaddr &&
201 lmsc->chipid == sc->sc_lmsc.chipid)
202 config_detach(&lmsc->sc_dev, 0);
209 lm_isa_detach(struct device *dev)
211 struct lm_isa_softc *sc = device_get_softc(dev);
214 /* Bus-independent detachment */
215 error = lm_detach(&sc->sc_lmsc);
219 error = bus_release_resource(dev, SYS_RES_IOPORT, sc->sc_iorid,
228 lm_isa_readreg(struct lm_softc *lmsc, int reg)
230 struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
232 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
233 return (bus_space_read_1(sc->sc_iot, sc->sc_ioh, LMC_DATA));
237 lm_isa_writereg(struct lm_softc *lmsc, int reg, int val)
239 struct lm_isa_softc *sc = (struct lm_isa_softc *)lmsc;
241 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_ADDR, reg);
242 bus_space_write_1(sc->sc_iot, sc->sc_ioh, LMC_DATA, val);