1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright 2016 Freescale Semiconductor, Inc.
4 
5 #include <linux/clk.h>
6 #include <linux/err.h>
7 #include <linux/io.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/platform_device.h>
11 #include <linux/regmap.h>
12 #include <linux/sizes.h>
13 #include <linux/thermal.h>
14 #include <linux/units.h>
15 
16 #include "thermal_hwmon.h"
17 
18 #define SITES_MAX		16
19 #define TMR_DISABLE		0x0
20 #define TMR_ME			0x80000000
21 #define TMR_ALPF		0x0c000000
22 #define TMR_ALPF_V2		0x03000000
23 #define TMTMIR_DEFAULT	0x0000000f
24 #define TIER_DISABLE	0x0
25 #define TEUMR0_V2		0x51009c00
26 #define TMSARA_V2		0xe
27 #define TMU_VER1		0x1
28 #define TMU_VER2		0x2
29 
30 #define REGS_TMR	0x000	/* Mode Register */
31 #define TMR_DISABLE	0x0
32 #define TMR_ME		0x80000000
33 #define TMR_ALPF	0x0c000000
34 
35 #define REGS_TMTMIR	0x008	/* Temperature measurement interval Register */
36 #define TMTMIR_DEFAULT	0x0000000f
37 
38 #define REGS_V2_TMSR	0x008	/* monitor site register */
39 
40 #define REGS_V2_TMTMIR	0x00c	/* Temperature measurement interval Register */
41 
42 #define REGS_TIER	0x020	/* Interrupt Enable Register */
43 #define TIER_DISABLE	0x0
44 
45 
46 #define REGS_TTCFGR	0x080	/* Temperature Configuration Register */
47 #define REGS_TSCFGR	0x084	/* Sensor Configuration Register */
48 
49 #define REGS_TRITSR(n)	(0x100 + 16 * (n)) /* Immediate Temperature
50 					    * Site Register
51 					    */
52 #define TRITSR_V	BIT(31)
53 #define TRITSR_TP5	BIT(9)
54 #define REGS_V2_TMSAR(n)	(0x304 + 16 * (n))	/* TMU monitoring
55 						* site adjustment register
56 						*/
57 #define REGS_TTRnCR(n)	(0xf10 + 4 * (n)) /* Temperature Range n
58 					   * Control Register
59 					   */
60 #define NUM_TTRCR_V1	4
61 #define NUM_TTRCR_MAX	16
62 
63 #define REGS_IPBRR(n)		(0xbf8 + 4 * (n)) /* IP Block Revision
64 						   * Register n
65 						   */
66 #define REGS_V2_TEUMR(n)	(0xf00 + 4 * (n))
67 
68 /*
69  * Thermal zone data
70  */
71 struct qoriq_sensor {
72 	int				id;
73 };
74 
75 struct qoriq_tmu_data {
76 	int ver;
77 	u32 ttrcr[NUM_TTRCR_MAX];
78 	struct regmap *regmap;
79 	struct clk *clk;
80 	struct qoriq_sensor	sensor[SITES_MAX];
81 };
82 
qoriq_sensor_to_data(struct qoriq_sensor * s)83 static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s)
84 {
85 	return container_of(s, struct qoriq_tmu_data, sensor[s->id]);
86 }
87 
tmu_get_temp(struct thermal_zone_device * tz,int * temp)88 static int tmu_get_temp(struct thermal_zone_device *tz, int *temp)
89 {
90 	struct qoriq_sensor *qsensor = thermal_zone_device_priv(tz);
91 	struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor);
92 	u32 val;
93 	/*
94 	 * REGS_TRITSR(id) has the following layout:
95 	 *
96 	 * For TMU Rev1:
97 	 * 31  ... 7 6 5 4 3 2 1 0
98 	 *  V          TEMP
99 	 *
100 	 * Where V bit signifies if the measurement is ready and is
101 	 * within sensor range. TEMP is an 8 bit value representing
102 	 * temperature in Celsius.
103 
104 	 * For TMU Rev2:
105 	 * 31  ... 8 7 6 5 4 3 2 1 0
106 	 *  V          TEMP
107 	 *
108 	 * Where V bit signifies if the measurement is ready and is
109 	 * within sensor range. TEMP is an 9 bit value representing
110 	 * temperature in KelVin.
111 	 */
112 
113 	regmap_read(qdata->regmap, REGS_TMR, &val);
114 	if (!(val & TMR_ME))
115 		return -EAGAIN;
116 
117 	if (regmap_read_poll_timeout(qdata->regmap,
118 				     REGS_TRITSR(qsensor->id),
119 				     val,
120 				     val & TRITSR_V,
121 				     USEC_PER_MSEC,
122 				     10 * USEC_PER_MSEC))
123 		return -ENODATA;
124 
125 	if (qdata->ver == TMU_VER1) {
126 		*temp = (val & GENMASK(7, 0)) * MILLIDEGREE_PER_DEGREE;
127 	} else {
128 		if (val & TRITSR_TP5)
129 			*temp = milli_kelvin_to_millicelsius((val & GENMASK(8, 0)) *
130 							     MILLIDEGREE_PER_DEGREE + 500);
131 		else
132 			*temp = kelvin_to_millicelsius(val & GENMASK(8, 0));
133 	}
134 
135 	return 0;
136 }
137 
138 static const struct thermal_zone_device_ops tmu_tz_ops = {
139 	.get_temp = tmu_get_temp,
140 };
141 
qoriq_tmu_register_tmu_zone(struct device * dev,struct qoriq_tmu_data * qdata)142 static int qoriq_tmu_register_tmu_zone(struct device *dev,
143 				       struct qoriq_tmu_data *qdata)
144 {
145 	int id, sites = 0;
146 
147 	for (id = 0; id < SITES_MAX; id++) {
148 		struct thermal_zone_device *tzd;
149 		struct qoriq_sensor *sensor = &qdata->sensor[id];
150 		int ret;
151 
152 		sensor->id = id;
153 
154 		tzd = devm_thermal_of_zone_register(dev, id,
155 						    sensor,
156 						    &tmu_tz_ops);
157 		ret = PTR_ERR_OR_ZERO(tzd);
158 		if (ret) {
159 			if (ret == -ENODEV)
160 				continue;
161 
162 			return ret;
163 		}
164 
165 		if (qdata->ver == TMU_VER1)
166 			sites |= 0x1 << (15 - id);
167 		else
168 			sites |= 0x1 << id;
169 
170 		devm_thermal_add_hwmon_sysfs(dev, tzd);
171 	}
172 
173 	if (sites) {
174 		if (qdata->ver == TMU_VER1) {
175 			regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF | sites);
176 		} else {
177 			regmap_write(qdata->regmap, REGS_V2_TMSR, sites);
178 			regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF_V2);
179 		}
180 	}
181 
182 	return 0;
183 }
184 
qoriq_tmu_calibration(struct device * dev,struct qoriq_tmu_data * data)185 static int qoriq_tmu_calibration(struct device *dev,
186 				 struct qoriq_tmu_data *data)
187 {
188 	int i, val, len;
189 	const u32 *calibration;
190 	struct device_node *np = dev->of_node;
191 
192 	len = of_property_count_u32_elems(np, "fsl,tmu-range");
193 	if (len < 0 || (data->ver == TMU_VER1 && len > NUM_TTRCR_V1) ||
194 	    (data->ver > TMU_VER1 && len > NUM_TTRCR_MAX)) {
195 		dev_err(dev, "invalid range data.\n");
196 		return len;
197 	}
198 
199 	val = of_property_read_u32_array(np, "fsl,tmu-range", data->ttrcr, len);
200 	if (val != 0) {
201 		dev_err(dev, "failed to read range data.\n");
202 		return val;
203 	}
204 
205 	/* Init temperature range registers */
206 	for (i = 0; i < len; i++)
207 		regmap_write(data->regmap, REGS_TTRnCR(i), data->ttrcr[i]);
208 
209 	calibration = of_get_property(np, "fsl,tmu-calibration", &len);
210 	if (calibration == NULL || len % 8) {
211 		dev_err(dev, "invalid calibration data.\n");
212 		return -ENODEV;
213 	}
214 
215 	for (i = 0; i < len; i += 8, calibration += 2) {
216 		val = of_read_number(calibration, 1);
217 		regmap_write(data->regmap, REGS_TTCFGR, val);
218 		val = of_read_number(calibration + 1, 1);
219 		regmap_write(data->regmap, REGS_TSCFGR, val);
220 	}
221 
222 	return 0;
223 }
224 
qoriq_tmu_init_device(struct qoriq_tmu_data * data)225 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
226 {
227 	/* Disable interrupt, using polling instead */
228 	regmap_write(data->regmap, REGS_TIER, TIER_DISABLE);
229 
230 	/* Set update_interval */
231 
232 	if (data->ver == TMU_VER1) {
233 		regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT);
234 	} else {
235 		regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT);
236 		regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2);
237 	}
238 
239 	/* Disable monitoring */
240 	regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
241 }
242 
243 static const struct regmap_range qoriq_yes_ranges[] = {
244 	regmap_reg_range(REGS_TMR, REGS_TSCFGR),
245 	regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(15)),
246 	regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)),
247 	regmap_reg_range(REGS_V2_TMSAR(0), REGS_V2_TMSAR(15)),
248 	regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)),
249 	/* Read only registers below */
250 	regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)),
251 };
252 
253 static const struct regmap_access_table qoriq_wr_table = {
254 	.yes_ranges	= qoriq_yes_ranges,
255 	.n_yes_ranges	= ARRAY_SIZE(qoriq_yes_ranges) - 1,
256 };
257 
258 static const struct regmap_access_table qoriq_rd_table = {
259 	.yes_ranges	= qoriq_yes_ranges,
260 	.n_yes_ranges	= ARRAY_SIZE(qoriq_yes_ranges),
261 };
262 
qoriq_tmu_action(void * p)263 static void qoriq_tmu_action(void *p)
264 {
265 	struct qoriq_tmu_data *data = p;
266 
267 	regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
268 	clk_disable_unprepare(data->clk);
269 }
270 
qoriq_tmu_probe(struct platform_device * pdev)271 static int qoriq_tmu_probe(struct platform_device *pdev)
272 {
273 	int ret;
274 	u32 ver;
275 	struct qoriq_tmu_data *data;
276 	struct device_node *np = pdev->dev.of_node;
277 	struct device *dev = &pdev->dev;
278 	const bool little_endian = of_property_read_bool(np, "little-endian");
279 	const enum regmap_endian format_endian =
280 		little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG;
281 	const struct regmap_config regmap_config = {
282 		.reg_bits		= 32,
283 		.val_bits		= 32,
284 		.reg_stride		= 4,
285 		.rd_table		= &qoriq_rd_table,
286 		.wr_table		= &qoriq_wr_table,
287 		.val_format_endian	= format_endian,
288 		.max_register		= SZ_4K,
289 	};
290 	void __iomem *base;
291 
292 	data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data),
293 			    GFP_KERNEL);
294 	if (!data)
295 		return -ENOMEM;
296 
297 	base = devm_platform_ioremap_resource(pdev, 0);
298 	ret = PTR_ERR_OR_ZERO(base);
299 	if (ret) {
300 		dev_err(dev, "Failed to get memory region\n");
301 		return ret;
302 	}
303 
304 	data->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
305 	ret = PTR_ERR_OR_ZERO(data->regmap);
306 	if (ret) {
307 		dev_err(dev, "Failed to init regmap (%d)\n", ret);
308 		return ret;
309 	}
310 
311 	data->clk = devm_clk_get_optional(dev, NULL);
312 	if (IS_ERR(data->clk))
313 		return PTR_ERR(data->clk);
314 
315 	ret = clk_prepare_enable(data->clk);
316 	if (ret) {
317 		dev_err(dev, "Failed to enable clock\n");
318 		return ret;
319 	}
320 
321 	ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data);
322 	if (ret)
323 		return ret;
324 
325 	/* version register offset at: 0xbf8 on both v1 and v2 */
326 	ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver);
327 	if (ret) {
328 		dev_err(&pdev->dev, "Failed to read IP block version\n");
329 		return ret;
330 	}
331 	data->ver = (ver >> 8) & 0xff;
332 
333 	qoriq_tmu_init_device(data);	/* TMU initialization */
334 
335 	ret = qoriq_tmu_calibration(dev, data);	/* TMU calibration */
336 	if (ret < 0)
337 		return ret;
338 
339 	ret = qoriq_tmu_register_tmu_zone(dev, data);
340 	if (ret < 0) {
341 		dev_err(dev, "Failed to register sensors\n");
342 		return ret;
343 	}
344 
345 	platform_set_drvdata(pdev, data);
346 
347 	return 0;
348 }
349 
qoriq_tmu_suspend(struct device * dev)350 static int qoriq_tmu_suspend(struct device *dev)
351 {
352 	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
353 	int ret;
354 
355 	ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0);
356 	if (ret)
357 		return ret;
358 
359 	clk_disable_unprepare(data->clk);
360 
361 	return 0;
362 }
363 
qoriq_tmu_resume(struct device * dev)364 static int qoriq_tmu_resume(struct device *dev)
365 {
366 	int ret;
367 	struct qoriq_tmu_data *data = dev_get_drvdata(dev);
368 
369 	ret = clk_prepare_enable(data->clk);
370 	if (ret)
371 		return ret;
372 
373 	/* Enable monitoring */
374 	return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME);
375 }
376 
377 static DEFINE_SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
378 				qoriq_tmu_suspend, qoriq_tmu_resume);
379 
380 static const struct of_device_id qoriq_tmu_match[] = {
381 	{ .compatible = "fsl,qoriq-tmu", },
382 	{ .compatible = "fsl,imx8mq-tmu", },
383 	{},
384 };
385 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
386 
387 static struct platform_driver qoriq_tmu = {
388 	.driver	= {
389 		.name		= "qoriq_thermal",
390 		.pm		= pm_sleep_ptr(&qoriq_tmu_pm_ops),
391 		.of_match_table	= qoriq_tmu_match,
392 	},
393 	.probe	= qoriq_tmu_probe,
394 };
395 module_platform_driver(qoriq_tmu);
396 
397 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
398 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
399 MODULE_LICENSE("GPL v2");
400