1 /* $OpenBSD: amltemp.c,v 1.2 2021/10/24 17:52:26 mpi Exp $ */
2 /*
3 * Copyright (c) 2020 Mark Kettenis <kettenis@openbsd.org>
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 #include <sys/param.h>
19 #include <sys/systm.h>
20 #include <sys/device.h>
21 #include <sys/sensors.h>
22
23 #include <machine/intr.h>
24 #include <machine/bus.h>
25 #include <machine/fdt.h>
26
27 #include <dev/ofw/openfirm.h>
28 #include <dev/ofw/ofw_clock.h>
29 #include <dev/ofw/ofw_misc.h>
30 #include <dev/ofw/ofw_thermal.h>
31 #include <dev/ofw/fdt.h>
32
33 /* Calibration */
34 #define TS_CALIB_VALID_MASK 0x8c000000
35 #define TS_CALIB_SIGN_MASK 0x00008000
36 #define TS_CALIB_VALUE_MASK 0x000003ff
37
38 /* Registers */
39 #define TS_CFG_REG1 0x01
40 #define TS_CFG_REG1_ANA_EN_VCM (1 << 10)
41 #define TS_CFG_REG1_ANA_EN_VBG (1 << 9)
42 #define TS_CFG_REG1_FILTER_EN (1 << 5)
43 #define TS_CFG_REG1_DEM_EN (1 << 3)
44 #define TS_CFG_REG1_ANA_CH_SEL 3
45 #define TS_STAT0 0x10
46 #define TS_STAT0_CODE_MASK 0xffff
47
48 #define HREAD4(sc, reg) \
49 (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2))
50 #define HWRITE4(sc, reg, val) \
51 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg) << 2, (val))
52 #define HSET4(sc, reg, bits) \
53 HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
54 #define HCLR4(sc, reg, bits) \
55 HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
56
57 struct amltemp_softc {
58 struct device sc_dev;
59 bus_space_tag_t sc_iot;
60 bus_space_handle_t sc_ioh;
61
62 int sc_node;
63 int32_t sc_calib;
64
65 struct ksensor sc_sensor;
66 struct ksensordev sc_sensordev;
67
68 struct thermal_sensor sc_ts;
69 };
70
71 int amltemp_match(struct device *, void *, void *);
72 void amltemp_attach(struct device *, struct device *, void *);
73
74 const struct cfattach amltemp_ca = {
75 sizeof (struct amltemp_softc), amltemp_match, amltemp_attach
76 };
77
78 struct cfdriver amltemp_cd = {
79 NULL, "amltemp", DV_DULL
80 };
81
82 void amltemp_attachhook(struct device *);
83 int32_t amltemp_calc_temp(struct amltemp_softc *, int32_t);
84 void amltemp_refresh_sensors(void *);
85 int32_t amltemp_get_temperature(void *, uint32_t *);
86
87 int
amltemp_match(struct device * parent,void * match,void * aux)88 amltemp_match(struct device *parent, void *match, void *aux)
89 {
90 struct fdt_attach_args *faa = aux;
91
92 return OF_is_compatible(faa->fa_node, "amlogic,g12a-thermal");
93 }
94
95 void
amltemp_attach(struct device * parent,struct device * self,void * aux)96 amltemp_attach(struct device *parent, struct device *self, void *aux)
97 {
98 struct amltemp_softc *sc = (struct amltemp_softc *)self;
99 struct fdt_attach_args *faa = aux;
100
101 if (faa->fa_nreg < 1) {
102 printf(": no registers\n");
103 return;
104 }
105
106 sc->sc_iot = faa->fa_iot;
107 if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
108 faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
109 printf(": can't map registers\n");
110 return;
111 }
112
113 sc->sc_node = faa->fa_node;
114 printf("\n");
115
116 config_mountroot(self, amltemp_attachhook);
117 }
118
119 void
amltemp_attachhook(struct device * self)120 amltemp_attachhook(struct device *self)
121 {
122 struct amltemp_softc *sc = (struct amltemp_softc *)self;
123 struct regmap *rm;
124 bus_addr_t offset;
125 const char *name;
126 uint32_t ao_secure;
127
128 if (OF_is_compatible(sc->sc_node, "amlogic,g12a-cpu-thermal")) {
129 offset = 0x128;
130 name = "CPU";
131 } else if (OF_is_compatible(sc->sc_node, "amlogic,g12a-ddr-thermal")) {
132 offset = 0x0f0;
133 name = "DDR";
134 } else {
135 printf("%s: unknown sensor\n", sc->sc_dev.dv_xname);
136 return;
137 }
138
139 /* Extract calibration value. */
140 ao_secure = OF_getpropint(sc->sc_node, "amlogic,ao-secure", 0);
141 rm = regmap_byphandle(ao_secure);
142 if (rm == NULL) {
143 printf("%s: no calibration info\n", sc->sc_dev.dv_xname);
144 return;
145 }
146 sc->sc_calib = regmap_read_4(rm, offset);
147 if ((sc->sc_calib & TS_CALIB_VALID_MASK) == 0) {
148 printf("%s: invalid calibration\n", sc->sc_dev.dv_xname);
149 return;
150 }
151 if (sc->sc_calib & TS_CALIB_SIGN_MASK)
152 sc->sc_calib = ~(sc->sc_calib & TS_CALIB_VALUE_MASK) + 1;
153 else
154 sc->sc_calib = (sc->sc_calib & TS_CALIB_VALUE_MASK);
155
156 /* Enable hardware. */
157 clock_enable_all(sc->sc_node);
158 HSET4(sc, TS_CFG_REG1, TS_CFG_REG1_ANA_EN_VCM |
159 TS_CFG_REG1_ANA_EN_VBG | TS_CFG_REG1_FILTER_EN |
160 TS_CFG_REG1_DEM_EN | TS_CFG_REG1_ANA_CH_SEL);
161
162 /* Register sensor. */
163 strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
164 sizeof(sc->sc_sensordev.xname));
165 strlcpy(sc->sc_sensor.desc, name, sizeof(sc->sc_sensor.desc));
166 sc->sc_sensor.type = SENSOR_TEMP;
167 sc->sc_sensor.flags = SENSOR_FINVALID;
168 sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
169 sensordev_install(&sc->sc_sensordev);
170 sensor_task_register(sc, amltemp_refresh_sensors, 5);
171
172 sc->sc_ts.ts_node = sc->sc_node;
173 sc->sc_ts.ts_cookie = sc;
174 sc->sc_ts.ts_get_temperature = amltemp_get_temperature;
175 thermal_sensor_register(&sc->sc_ts);
176 }
177
178 int32_t
amltemp_calc_temp(struct amltemp_softc * sc,int32_t code)179 amltemp_calc_temp(struct amltemp_softc *sc, int32_t code)
180 {
181 const uint32_t A = 9411;
182 const uint32_t B = 3159;
183 const uint32_t m = 424;
184 const uint32_t n = 324;
185 int64_t tmp1, tmp2;
186
187 tmp1 = (code * m) / 100;
188 tmp2 = (code * n) / 100;
189 tmp1 = (tmp1 * (1 << 16)) / ((1 << 16) + tmp2);
190 tmp1 = ((tmp1 + sc->sc_calib) * A) / (1 << 16);
191 return (tmp1 - B) * 100;
192 }
193
194 void
amltemp_refresh_sensors(void * arg)195 amltemp_refresh_sensors(void *arg)
196 {
197 struct amltemp_softc *sc = arg;
198 int32_t code, temp;
199
200 code = HREAD4(sc, TS_STAT0);
201 temp = amltemp_calc_temp(sc, code & TS_STAT0_CODE_MASK);
202
203 sc->sc_sensor.value = 273150000 + 1000 * temp;
204 sc->sc_sensor.flags &= ~SENSOR_FINVALID;
205 }
206
207 int32_t
amltemp_get_temperature(void * cookie,uint32_t * cells)208 amltemp_get_temperature(void *cookie, uint32_t *cells)
209 {
210 struct amltemp_softc *sc = cookie;
211 int32_t code;
212
213 code = HREAD4(sc, TS_STAT0);
214 return amltemp_calc_temp(sc, code & TS_STAT0_CODE_MASK);
215 }
216