1/*	$OpenBSD: km.c,v 1.14 2022/03/11 18:00:50 mpi Exp $	*/
2
3/*
4 * Copyright (c) 2008 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
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
24#include <machine/bus.h>
25
26#include <dev/pci/pcivar.h>
27#include <dev/pci/pcidevs.h>
28
29
30/*
31 * AMD Family > 10h Processors, Function 3 -- Miscellaneous Control
32 */
33
34/* Function 3 Registers */
35#define KM_REP_TEMP_CONTR_R	0xa4
36#define KM_THERMTRIP_STAT_R	0xe4
37#define KM_NORTHBRIDGE_CAP_R	0xe8
38#define KM_CPUID_FAMILY_MODEL_R	0xfc
39
40/* Operations on Reported Temperature Control Register */
41#define KM_GET_CURTMP(r)	(((r) >> 21) & 0x7ff)
42
43/* Operations on Thermtrip Status Register */
44#define KM_GET_DIODEOFFSET(r)	(((r) >> 8) & 0x7f)
45
46
47struct km_softc {
48	struct device		sc_dev;
49
50	pci_chipset_tag_t	sc_pc;
51	pcitag_t		sc_pcitag;
52
53	struct ksensor		sc_sensor;
54	struct ksensordev	sc_sensordev;
55};
56
57int	km_match(struct device *, void *, void *);
58void	km_attach(struct device *, struct device *, void *);
59void	km_refresh(void *);
60
61const struct cfattach km_ca = {
62	sizeof(struct km_softc), km_match, km_attach
63};
64
65struct cfdriver km_cd = {
66	NULL, "km", DV_DULL
67};
68
69static const struct pci_matchid km_devices[] = {
70	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_10_MISC },
71	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_11_MISC },
72	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_14_MISC },
73	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_15_0X_MISC },
74	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_15_1X_MISC },
75	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_16_MISC },
76	{ PCI_VENDOR_AMD, PCI_PRODUCT_AMD_16_3X_MISC }
77};
78
79
80int
81km_match(struct device *parent, void *match, void *aux)
82{
83	/* successful match supersedes pchb(4) */
84	return pci_matchbyid((struct pci_attach_args *)aux, km_devices,
85	    sizeof(km_devices) / sizeof(km_devices[0])) * 2;
86}
87
88void
89km_attach(struct device *parent, struct device *self, void *aux)
90{
91	struct km_softc		*sc = (struct km_softc *)self;
92	struct pci_attach_args	*pa = aux;
93
94	sc->sc_pc = pa->pa_pc;
95	sc->sc_pcitag = pa->pa_tag;
96
97	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
98	    sizeof(sc->sc_sensordev.xname));
99
100	sc->sc_sensor.type = SENSOR_TEMP;
101	sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
102
103	if (sensor_task_register(sc, km_refresh, 5) == NULL) {
104		printf(": unable to register update task\n");
105		return;
106	}
107
108	sensordev_install(&sc->sc_sensordev);
109
110	printf("\n");
111}
112
113void
114km_refresh(void *arg)
115{
116	struct km_softc	*sc = arg;
117	struct ksensor	*s = &sc->sc_sensor;
118	pcireg_t	r;
119	int		c;
120
121	r = pci_conf_read(sc->sc_pc, sc->sc_pcitag, KM_REP_TEMP_CONTR_R);
122	c = KM_GET_CURTMP(r);
123	s->value = c * 125000 + 273150000;
124}
125