1/*	$OpenBSD: pchtemp.c,v 1.7 2022/03/11 18:00:51 mpi Exp $	*/
2/*
3 * Copyright (c) 2015 Mark Kettenis
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
18/*
19 * Intel X99, C610, 9 Series and 100 Series PCH thermal sensor
20 * controller driver
21 */
22
23#include <sys/param.h>
24#include <sys/systm.h>
25#include <sys/device.h>
26#include <sys/sensors.h>
27
28#include <dev/pci/pcireg.h>
29#include <dev/pci/pcivar.h>
30#include <dev/pci/pcidevs.h>
31
32#define PCHTEMP_PCI_TBAR	0x10
33
34#define PCHTEMP_TEMP		0x00
35#define PCHTEMP_TSEL		0x08
36#define  PCHTEMP_TSEL_ETS	0x01
37
38struct pchtemp_softc {
39	struct device		sc_dev;
40
41	bus_space_tag_t		sc_memt;
42	bus_space_handle_t	sc_memh;
43	bus_size_t		sc_mems;
44
45	struct ksensor		sc_sensor;
46	struct ksensordev	sc_sensordev;
47};
48
49int	pchtemp_match(struct device *, void *, void *);
50void	pchtemp_attach(struct device *, struct device *, void *);
51void	pchtemp_refresh(void *);
52
53struct cfdriver pchtemp_cd = {
54	NULL, "pchtemp", DV_DULL
55};
56
57const struct cfattach pchtemp_ca = {
58	sizeof(struct pchtemp_softc), pchtemp_match, pchtemp_attach
59};
60
61const struct pci_matchid pchtemp_devices[] = {
62	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_C610_THERM },
63	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_8SERIES_LP_THERM },
64	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_9SERIES_LP_THERM },
65	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_100SERIES_THERM },
66	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_100SERIES_LP_THERM },
67	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_THERM },
68	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_300SERIES_U_THERM },
69	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_400SERIES_THERM },
70	{ PCI_VENDOR_INTEL, PCI_PRODUCT_INTEL_400SERIES_LP_THERM },
71};
72
73int
74pchtemp_match(struct device *parent, void *match, void *aux)
75{
76	return (pci_matchbyid(aux, pchtemp_devices, nitems(pchtemp_devices)));
77}
78
79void
80pchtemp_attach(struct device *parent, struct device *self, void *aux)
81{
82	struct pchtemp_softc *sc = (struct pchtemp_softc *)self;
83	struct pci_attach_args *pa = aux;
84	pcireg_t memtype;
85	uint8_t tsel;
86
87	memtype = PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_64BIT;
88	if (pci_mapreg_map(pa, PCHTEMP_PCI_TBAR, memtype, 0,
89	    &sc->sc_memt, &sc->sc_memh, NULL, &sc->sc_mems, 0)) {
90		printf(": can't map registers\n");
91		return;
92	}
93
94	tsel = bus_space_read_1(sc->sc_memt, sc->sc_memh, PCHTEMP_TSEL);
95	if ((tsel & PCHTEMP_TSEL_ETS) == 0) {
96		printf(": disabled\n");
97		goto unmap;
98	}
99
100	pchtemp_refresh(sc);
101
102	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
103	    sizeof(sc->sc_sensordev.xname));
104
105	sc->sc_sensor.type = SENSOR_TEMP;
106	sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
107
108	if (sensor_task_register(sc, pchtemp_refresh, 5) == NULL) {
109		printf(": can't register update task\n");
110		goto unmap;
111	}
112
113	sensordev_install(&sc->sc_sensordev);
114
115	printf("\n");
116	return;
117
118 unmap:
119	bus_space_unmap(sc->sc_memt, sc->sc_memh, sc->sc_mems);
120}
121
122void
123pchtemp_refresh(void *arg)
124{
125	struct pchtemp_softc *sc = arg;
126	uint16_t temp;
127
128	temp = bus_space_read_2(sc->sc_memt, sc->sc_memh, PCHTEMP_TEMP);
129	sc->sc_sensor.value = (temp * 500000 - 50000000) + 273150000;
130}
131