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