1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright 2020 NXP.
4 *
5 * Author: Anson Huang <Anson.Huang@nxp.com>
6 */
7
8 #include <linux/bitfield.h>
9 #include <linux/clk.h>
10 #include <linux/err.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/nvmem-consumer.h>
14 #include <linux/of.h>
15 #include <linux/platform_device.h>
16 #include <linux/slab.h>
17 #include <linux/thermal.h>
18
19 #include "thermal_hwmon.h"
20
21 #define TER 0x0 /* TMU enable */
22 #define TPS 0x4
23 #define TRITSR 0x20 /* TMU immediate temp */
24 /* TMU calibration data registers */
25 #define TASR 0x28
26 #define TASR_BUF_SLOPE_MASK GENMASK(19, 16)
27 #define TASR_BUF_VREF_MASK GENMASK(4, 0) /* TMU_V1 */
28 #define TASR_BUF_VERF_SEL_MASK GENMASK(1, 0) /* TMU_V2 */
29 #define TCALIV(n) (0x30 + ((n) * 4))
30 #define TCALIV_EN BIT(31)
31 #define TCALIV_HR_MASK GENMASK(23, 16) /* TMU_V1 */
32 #define TCALIV_RT_MASK GENMASK(7, 0) /* TMU_V1 */
33 #define TCALIV_SNSR105C_MASK GENMASK(27, 16) /* TMU_V2 */
34 #define TCALIV_SNSR25C_MASK GENMASK(11, 0) /* TMU_V2 */
35 #define TRIM 0x3c
36 #define TRIM_BJT_CUR_MASK GENMASK(23, 20)
37 #define TRIM_BGR_MASK GENMASK(31, 28)
38 #define TRIM_VLSB_MASK GENMASK(15, 12)
39 #define TRIM_EN_CH BIT(7)
40
41 #define TER_ADC_PD BIT(30)
42 #define TER_EN BIT(31)
43 #define TRITSR_TEMP0_VAL_MASK GENMASK(7, 0)
44 #define TRITSR_TEMP1_VAL_MASK GENMASK(23, 16)
45
46 #define PROBE_SEL_ALL GENMASK(31, 30)
47
48 #define probe_status_offset(x) (30 + x)
49 #define SIGN_BIT BIT(7)
50 #define TEMP_VAL_MASK GENMASK(6, 0)
51
52 /* TMU OCOTP calibration data bitfields */
53 #define ANA0_EN BIT(25)
54 #define ANA0_BUF_VREF_MASK GENMASK(24, 20)
55 #define ANA0_BUF_SLOPE_MASK GENMASK(19, 16)
56 #define ANA0_HR_MASK GENMASK(15, 8)
57 #define ANA0_RT_MASK GENMASK(7, 0)
58 #define TRIM2_VLSB_MASK GENMASK(23, 20)
59 #define TRIM2_BGR_MASK GENMASK(19, 16)
60 #define TRIM2_BJT_CUR_MASK GENMASK(15, 12)
61 #define TRIM2_BUF_SLOP_SEL_MASK GENMASK(11, 8)
62 #define TRIM2_BUF_VERF_SEL_MASK GENMASK(7, 6)
63 #define TRIM3_TCA25_0_LSB_MASK GENMASK(31, 28)
64 #define TRIM3_TCA40_0_MASK GENMASK(27, 16)
65 #define TRIM4_TCA40_1_MASK GENMASK(31, 20)
66 #define TRIM4_TCA105_0_MASK GENMASK(19, 8)
67 #define TRIM4_TCA25_0_MSB_MASK GENMASK(7, 0)
68 #define TRIM5_TCA105_1_MASK GENMASK(23, 12)
69 #define TRIM5_TCA25_1_MASK GENMASK(11, 0)
70
71 #define VER1_TEMP_LOW_LIMIT 10000
72 #define VER2_TEMP_LOW_LIMIT -40000
73 #define VER2_TEMP_HIGH_LIMIT 125000
74
75 #define TMU_VER1 0x1
76 #define TMU_VER2 0x2
77
78 struct thermal_soc_data {
79 u32 num_sensors;
80 u32 version;
81 int (*get_temp)(void *, int *);
82 };
83
84 struct tmu_sensor {
85 struct imx8mm_tmu *priv;
86 u32 hw_id;
87 struct thermal_zone_device *tzd;
88 };
89
90 struct imx8mm_tmu {
91 void __iomem *base;
92 struct clk *clk;
93 const struct thermal_soc_data *socdata;
94 struct tmu_sensor sensors[];
95 };
96
imx8mm_tmu_get_temp(void * data,int * temp)97 static int imx8mm_tmu_get_temp(void *data, int *temp)
98 {
99 struct tmu_sensor *sensor = data;
100 struct imx8mm_tmu *tmu = sensor->priv;
101 u32 val;
102
103 val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
104
105 /*
106 * Do not validate against the V bit (bit 31) due to errata
107 * ERR051272: TMU: Bit 31 of registers TMU_TSCR/TMU_TRITSR/TMU_TRATSR invalid
108 */
109
110 *temp = val * 1000;
111 if (*temp < VER1_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
112 return -EAGAIN;
113
114 return 0;
115 }
116
imx8mp_tmu_get_temp(void * data,int * temp)117 static int imx8mp_tmu_get_temp(void *data, int *temp)
118 {
119 struct tmu_sensor *sensor = data;
120 struct imx8mm_tmu *tmu = sensor->priv;
121 unsigned long val;
122 bool ready;
123
124 val = readl_relaxed(tmu->base + TRITSR);
125 ready = test_bit(probe_status_offset(sensor->hw_id), &val);
126 if (!ready)
127 return -EAGAIN;
128
129 val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) :
130 FIELD_GET(TRITSR_TEMP0_VAL_MASK, val);
131 if (val & SIGN_BIT) /* negative */
132 val = (~(val & TEMP_VAL_MASK) + 1);
133
134 *temp = val * 1000;
135 if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
136 return -EAGAIN;
137
138 return 0;
139 }
140
tmu_get_temp(struct thermal_zone_device * tz,int * temp)141 static int tmu_get_temp(struct thermal_zone_device *tz, int *temp)
142 {
143 struct tmu_sensor *sensor = thermal_zone_device_priv(tz);
144 struct imx8mm_tmu *tmu = sensor->priv;
145
146 return tmu->socdata->get_temp(sensor, temp);
147 }
148
149 static const struct thermal_zone_device_ops tmu_tz_ops = {
150 .get_temp = tmu_get_temp,
151 };
152
imx8mm_tmu_enable(struct imx8mm_tmu * tmu,bool enable)153 static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
154 {
155 u32 val;
156
157 val = readl_relaxed(tmu->base + TER);
158 val = enable ? (val | TER_EN) : (val & ~TER_EN);
159 if (tmu->socdata->version == TMU_VER2)
160 val = enable ? (val & ~TER_ADC_PD) : (val | TER_ADC_PD);
161 writel_relaxed(val, tmu->base + TER);
162 }
163
imx8mm_tmu_probe_sel_all(struct imx8mm_tmu * tmu)164 static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu)
165 {
166 u32 val;
167
168 val = readl_relaxed(tmu->base + TPS);
169 val |= PROBE_SEL_ALL;
170 writel_relaxed(val, tmu->base + TPS);
171 }
172
imx8mm_tmu_probe_set_calib_v1(struct platform_device * pdev,struct imx8mm_tmu * tmu)173 static int imx8mm_tmu_probe_set_calib_v1(struct platform_device *pdev,
174 struct imx8mm_tmu *tmu)
175 {
176 struct device *dev = &pdev->dev;
177 u32 ana0;
178 int ret;
179
180 ret = nvmem_cell_read_u32(&pdev->dev, "calib", &ana0);
181 if (ret)
182 return dev_err_probe(dev, ret, "Failed to read OCOTP nvmem cell\n");
183
184 writel(FIELD_PREP(TASR_BUF_VREF_MASK,
185 FIELD_GET(ANA0_BUF_VREF_MASK, ana0)) |
186 FIELD_PREP(TASR_BUF_SLOPE_MASK,
187 FIELD_GET(ANA0_BUF_SLOPE_MASK, ana0)),
188 tmu->base + TASR);
189
190 writel(FIELD_PREP(TCALIV_RT_MASK, FIELD_GET(ANA0_RT_MASK, ana0)) |
191 FIELD_PREP(TCALIV_HR_MASK, FIELD_GET(ANA0_HR_MASK, ana0)) |
192 ((ana0 & ANA0_EN) ? TCALIV_EN : 0),
193 tmu->base + TCALIV(0));
194
195 return 0;
196 }
197
imx8mm_tmu_probe_set_calib_v2(struct platform_device * pdev,struct imx8mm_tmu * tmu)198 static int imx8mm_tmu_probe_set_calib_v2(struct platform_device *pdev,
199 struct imx8mm_tmu *tmu)
200 {
201 struct device *dev = &pdev->dev;
202 struct nvmem_cell *cell;
203 u32 trim[4] = { 0 };
204 size_t len;
205 void *buf;
206
207 cell = nvmem_cell_get(dev, "calib");
208 if (IS_ERR(cell))
209 return PTR_ERR(cell);
210
211 buf = nvmem_cell_read(cell, &len);
212 nvmem_cell_put(cell);
213
214 if (IS_ERR(buf))
215 return PTR_ERR(buf);
216
217 memcpy(trim, buf, min(len, sizeof(trim)));
218 kfree(buf);
219
220 if (len != 16) {
221 dev_err(dev,
222 "OCOTP nvmem cell length is %zu, must be 16.\n", len);
223 return -EINVAL;
224 }
225
226 /* Blank sample hardware */
227 if (!trim[0] && !trim[1] && !trim[2] && !trim[3]) {
228 /* Use a default 25C binary codes */
229 writel(FIELD_PREP(TCALIV_SNSR25C_MASK, 0x63c),
230 tmu->base + TCALIV(0));
231 writel(FIELD_PREP(TCALIV_SNSR25C_MASK, 0x63c),
232 tmu->base + TCALIV(1));
233 return 0;
234 }
235
236 writel(FIELD_PREP(TASR_BUF_VERF_SEL_MASK,
237 FIELD_GET(TRIM2_BUF_VERF_SEL_MASK, trim[0])) |
238 FIELD_PREP(TASR_BUF_SLOPE_MASK,
239 FIELD_GET(TRIM2_BUF_SLOP_SEL_MASK, trim[0])),
240 tmu->base + TASR);
241
242 writel(FIELD_PREP(TRIM_BJT_CUR_MASK,
243 FIELD_GET(TRIM2_BJT_CUR_MASK, trim[0])) |
244 FIELD_PREP(TRIM_BGR_MASK, FIELD_GET(TRIM2_BGR_MASK, trim[0])) |
245 FIELD_PREP(TRIM_VLSB_MASK, FIELD_GET(TRIM2_VLSB_MASK, trim[0])) |
246 TRIM_EN_CH,
247 tmu->base + TRIM);
248
249 writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
250 FIELD_GET(TRIM3_TCA25_0_LSB_MASK, trim[1]) |
251 (FIELD_GET(TRIM4_TCA25_0_MSB_MASK, trim[2]) << 4)) |
252 FIELD_PREP(TCALIV_SNSR105C_MASK,
253 FIELD_GET(TRIM4_TCA105_0_MASK, trim[2])),
254 tmu->base + TCALIV(0));
255
256 writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
257 FIELD_GET(TRIM5_TCA25_1_MASK, trim[3])) |
258 FIELD_PREP(TCALIV_SNSR105C_MASK,
259 FIELD_GET(TRIM5_TCA105_1_MASK, trim[3])),
260 tmu->base + TCALIV(1));
261
262 writel(FIELD_PREP(TCALIV_SNSR25C_MASK,
263 FIELD_GET(TRIM3_TCA40_0_MASK, trim[1])) |
264 FIELD_PREP(TCALIV_SNSR105C_MASK,
265 FIELD_GET(TRIM4_TCA40_1_MASK, trim[2])),
266 tmu->base + TCALIV(2));
267
268 return 0;
269 }
270
imx8mm_tmu_probe_set_calib(struct platform_device * pdev,struct imx8mm_tmu * tmu)271 static int imx8mm_tmu_probe_set_calib(struct platform_device *pdev,
272 struct imx8mm_tmu *tmu)
273 {
274 struct device *dev = &pdev->dev;
275
276 /*
277 * Lack of calibration data OCOTP reference is not considered
278 * fatal to retain compatibility with old DTs. It is however
279 * strongly recommended to update such old DTs to get correct
280 * temperature compensation values for each SoC.
281 */
282 if (!of_property_present(pdev->dev.of_node, "nvmem-cells")) {
283 dev_warn(dev,
284 "No OCOTP nvmem reference found, SoC-specific calibration not loaded. Please update your DT.\n");
285 return 0;
286 }
287
288 if (tmu->socdata->version == TMU_VER1)
289 return imx8mm_tmu_probe_set_calib_v1(pdev, tmu);
290
291 return imx8mm_tmu_probe_set_calib_v2(pdev, tmu);
292 }
293
imx8mm_tmu_probe(struct platform_device * pdev)294 static int imx8mm_tmu_probe(struct platform_device *pdev)
295 {
296 const struct thermal_soc_data *data;
297 struct imx8mm_tmu *tmu;
298 int ret;
299 int i;
300
301 data = of_device_get_match_data(&pdev->dev);
302
303 tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors,
304 data->num_sensors), GFP_KERNEL);
305 if (!tmu)
306 return -ENOMEM;
307
308 tmu->socdata = data;
309
310 tmu->base = devm_platform_ioremap_resource(pdev, 0);
311 if (IS_ERR(tmu->base))
312 return PTR_ERR(tmu->base);
313
314 tmu->clk = devm_clk_get(&pdev->dev, NULL);
315 if (IS_ERR(tmu->clk))
316 return dev_err_probe(&pdev->dev, PTR_ERR(tmu->clk),
317 "failed to get tmu clock\n");
318
319 ret = clk_prepare_enable(tmu->clk);
320 if (ret) {
321 dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
322 return ret;
323 }
324
325 /* disable the monitor during initialization */
326 imx8mm_tmu_enable(tmu, false);
327
328 for (i = 0; i < data->num_sensors; i++) {
329 tmu->sensors[i].priv = tmu;
330 tmu->sensors[i].tzd =
331 devm_thermal_of_zone_register(&pdev->dev, i,
332 &tmu->sensors[i],
333 &tmu_tz_ops);
334 if (IS_ERR(tmu->sensors[i].tzd)) {
335 ret = PTR_ERR(tmu->sensors[i].tzd);
336 dev_err(&pdev->dev,
337 "failed to register thermal zone sensor[%d]: %d\n",
338 i, ret);
339 goto disable_clk;
340 }
341 tmu->sensors[i].hw_id = i;
342
343 devm_thermal_add_hwmon_sysfs(&pdev->dev, tmu->sensors[i].tzd);
344 }
345
346 platform_set_drvdata(pdev, tmu);
347
348 ret = imx8mm_tmu_probe_set_calib(pdev, tmu);
349 if (ret)
350 goto disable_clk;
351
352 /* enable all the probes for V2 TMU */
353 if (tmu->socdata->version == TMU_VER2)
354 imx8mm_tmu_probe_sel_all(tmu);
355
356 /* enable the monitor */
357 imx8mm_tmu_enable(tmu, true);
358
359 return 0;
360
361 disable_clk:
362 clk_disable_unprepare(tmu->clk);
363 return ret;
364 }
365
imx8mm_tmu_remove(struct platform_device * pdev)366 static int imx8mm_tmu_remove(struct platform_device *pdev)
367 {
368 struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);
369
370 /* disable TMU */
371 imx8mm_tmu_enable(tmu, false);
372
373 clk_disable_unprepare(tmu->clk);
374 platform_set_drvdata(pdev, NULL);
375
376 return 0;
377 }
378
379 static struct thermal_soc_data imx8mm_tmu_data = {
380 .num_sensors = 1,
381 .version = TMU_VER1,
382 .get_temp = imx8mm_tmu_get_temp,
383 };
384
385 static struct thermal_soc_data imx8mp_tmu_data = {
386 .num_sensors = 2,
387 .version = TMU_VER2,
388 .get_temp = imx8mp_tmu_get_temp,
389 };
390
391 static const struct of_device_id imx8mm_tmu_table[] = {
392 { .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, },
393 { .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, },
394 { },
395 };
396 MODULE_DEVICE_TABLE(of, imx8mm_tmu_table);
397
398 static struct platform_driver imx8mm_tmu = {
399 .driver = {
400 .name = "i.mx8mm_thermal",
401 .of_match_table = imx8mm_tmu_table,
402 },
403 .probe = imx8mm_tmu_probe,
404 .remove = imx8mm_tmu_remove,
405 };
406 module_platform_driver(imx8mm_tmu);
407
408 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
409 MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
410 MODULE_LICENSE("GPL v2");
411