Merge tag 'iio-fixes-for-6.6a' of https://git.kernel.org/pub/scm/linux/kernel/git...
[platform/kernel/linux-starfive.git] / drivers / thermal / qoriq_thermal.c
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 REGS_IPBRR(n)           (0xbf8 + 4 * (n)) /* IP Block Revision
61                                                    * Register n
62                                                    */
63 #define REGS_V2_TEUMR(n)        (0xf00 + 4 * (n))
64
65 /*
66  * Thermal zone data
67  */
68 struct qoriq_sensor {
69         int                             id;
70 };
71
72 struct qoriq_tmu_data {
73         int ver;
74         struct regmap *regmap;
75         struct clk *clk;
76         struct qoriq_sensor     sensor[SITES_MAX];
77 };
78
79 static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s)
80 {
81         return container_of(s, struct qoriq_tmu_data, sensor[s->id]);
82 }
83
84 static int tmu_get_temp(struct thermal_zone_device *tz, int *temp)
85 {
86         struct qoriq_sensor *qsensor = thermal_zone_device_priv(tz);
87         struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor);
88         u32 val;
89         /*
90          * REGS_TRITSR(id) has the following layout:
91          *
92          * For TMU Rev1:
93          * 31  ... 7 6 5 4 3 2 1 0
94          *  V          TEMP
95          *
96          * Where V bit signifies if the measurement is ready and is
97          * within sensor range. TEMP is an 8 bit value representing
98          * temperature in Celsius.
99
100          * For TMU Rev2:
101          * 31  ... 8 7 6 5 4 3 2 1 0
102          *  V          TEMP
103          *
104          * Where V bit signifies if the measurement is ready and is
105          * within sensor range. TEMP is an 9 bit value representing
106          * temperature in KelVin.
107          */
108
109         regmap_read(qdata->regmap, REGS_TMR, &val);
110         if (!(val & TMR_ME))
111                 return -EAGAIN;
112
113         if (regmap_read_poll_timeout(qdata->regmap,
114                                      REGS_TRITSR(qsensor->id),
115                                      val,
116                                      val & TRITSR_V,
117                                      USEC_PER_MSEC,
118                                      10 * USEC_PER_MSEC))
119                 return -ENODATA;
120
121         if (qdata->ver == TMU_VER1) {
122                 *temp = (val & GENMASK(7, 0)) * MILLIDEGREE_PER_DEGREE;
123         } else {
124                 if (val & TRITSR_TP5)
125                         *temp = milli_kelvin_to_millicelsius((val & GENMASK(8, 0)) *
126                                                              MILLIDEGREE_PER_DEGREE + 500);
127                 else
128                         *temp = kelvin_to_millicelsius(val & GENMASK(8, 0));
129         }
130
131         return 0;
132 }
133
134 static const struct thermal_zone_device_ops tmu_tz_ops = {
135         .get_temp = tmu_get_temp,
136 };
137
138 static int qoriq_tmu_register_tmu_zone(struct device *dev,
139                                        struct qoriq_tmu_data *qdata)
140 {
141         int id, sites = 0;
142
143         for (id = 0; id < SITES_MAX; id++) {
144                 struct thermal_zone_device *tzd;
145                 struct qoriq_sensor *sensor = &qdata->sensor[id];
146                 int ret;
147
148                 sensor->id = id;
149
150                 tzd = devm_thermal_of_zone_register(dev, id,
151                                                     sensor,
152                                                     &tmu_tz_ops);
153                 ret = PTR_ERR_OR_ZERO(tzd);
154                 if (ret) {
155                         if (ret == -ENODEV)
156                                 continue;
157
158                         return ret;
159                 }
160
161                 if (qdata->ver == TMU_VER1)
162                         sites |= 0x1 << (15 - id);
163                 else
164                         sites |= 0x1 << id;
165
166                 devm_thermal_add_hwmon_sysfs(dev, tzd);
167         }
168
169         if (sites) {
170                 if (qdata->ver == TMU_VER1) {
171                         regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF | sites);
172                 } else {
173                         regmap_write(qdata->regmap, REGS_V2_TMSR, sites);
174                         regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF_V2);
175                 }
176         }
177
178         return 0;
179 }
180
181 static int qoriq_tmu_calibration(struct device *dev,
182                                  struct qoriq_tmu_data *data)
183 {
184         int i, val, len;
185         u32 range[4];
186         const u32 *calibration;
187         struct device_node *np = dev->of_node;
188
189         len = of_property_count_u32_elems(np, "fsl,tmu-range");
190         if (len < 0 || len > 4) {
191                 dev_err(dev, "invalid range data.\n");
192                 return len;
193         }
194
195         val = of_property_read_u32_array(np, "fsl,tmu-range", range, len);
196         if (val != 0) {
197                 dev_err(dev, "failed to read range data.\n");
198                 return val;
199         }
200
201         /* Init temperature range registers */
202         for (i = 0; i < len; i++)
203                 regmap_write(data->regmap, REGS_TTRnCR(i), range[i]);
204
205         calibration = of_get_property(np, "fsl,tmu-calibration", &len);
206         if (calibration == NULL || len % 8) {
207                 dev_err(dev, "invalid calibration data.\n");
208                 return -ENODEV;
209         }
210
211         for (i = 0; i < len; i += 8, calibration += 2) {
212                 val = of_read_number(calibration, 1);
213                 regmap_write(data->regmap, REGS_TTCFGR, val);
214                 val = of_read_number(calibration + 1, 1);
215                 regmap_write(data->regmap, REGS_TSCFGR, val);
216         }
217
218         return 0;
219 }
220
221 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
222 {
223         /* Disable interrupt, using polling instead */
224         regmap_write(data->regmap, REGS_TIER, TIER_DISABLE);
225
226         /* Set update_interval */
227
228         if (data->ver == TMU_VER1) {
229                 regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT);
230         } else {
231                 regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT);
232                 regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2);
233         }
234
235         /* Disable monitoring */
236         regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
237 }
238
239 static const struct regmap_range qoriq_yes_ranges[] = {
240         regmap_reg_range(REGS_TMR, REGS_TSCFGR),
241         regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(15)),
242         regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)),
243         regmap_reg_range(REGS_V2_TMSAR(0), REGS_V2_TMSAR(15)),
244         regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)),
245         /* Read only registers below */
246         regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)),
247 };
248
249 static const struct regmap_access_table qoriq_wr_table = {
250         .yes_ranges     = qoriq_yes_ranges,
251         .n_yes_ranges   = ARRAY_SIZE(qoriq_yes_ranges) - 1,
252 };
253
254 static const struct regmap_access_table qoriq_rd_table = {
255         .yes_ranges     = qoriq_yes_ranges,
256         .n_yes_ranges   = ARRAY_SIZE(qoriq_yes_ranges),
257 };
258
259 static void qoriq_tmu_action(void *p)
260 {
261         struct qoriq_tmu_data *data = p;
262
263         regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
264         clk_disable_unprepare(data->clk);
265 }
266
267 static int qoriq_tmu_probe(struct platform_device *pdev)
268 {
269         int ret;
270         u32 ver;
271         struct qoriq_tmu_data *data;
272         struct device_node *np = pdev->dev.of_node;
273         struct device *dev = &pdev->dev;
274         const bool little_endian = of_property_read_bool(np, "little-endian");
275         const enum regmap_endian format_endian =
276                 little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG;
277         const struct regmap_config regmap_config = {
278                 .reg_bits               = 32,
279                 .val_bits               = 32,
280                 .reg_stride             = 4,
281                 .rd_table               = &qoriq_rd_table,
282                 .wr_table               = &qoriq_wr_table,
283                 .val_format_endian      = format_endian,
284                 .max_register           = SZ_4K,
285         };
286         void __iomem *base;
287
288         data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data),
289                             GFP_KERNEL);
290         if (!data)
291                 return -ENOMEM;
292
293         base = devm_platform_ioremap_resource(pdev, 0);
294         ret = PTR_ERR_OR_ZERO(base);
295         if (ret) {
296                 dev_err(dev, "Failed to get memory region\n");
297                 return ret;
298         }
299
300         data->regmap = devm_regmap_init_mmio(dev, base, &regmap_config);
301         ret = PTR_ERR_OR_ZERO(data->regmap);
302         if (ret) {
303                 dev_err(dev, "Failed to init regmap (%d)\n", ret);
304                 return ret;
305         }
306
307         data->clk = devm_clk_get_optional(dev, NULL);
308         if (IS_ERR(data->clk))
309                 return PTR_ERR(data->clk);
310
311         ret = clk_prepare_enable(data->clk);
312         if (ret) {
313                 dev_err(dev, "Failed to enable clock\n");
314                 return ret;
315         }
316
317         ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data);
318         if (ret)
319                 return ret;
320
321         /* version register offset at: 0xbf8 on both v1 and v2 */
322         ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver);
323         if (ret) {
324                 dev_err(&pdev->dev, "Failed to read IP block version\n");
325                 return ret;
326         }
327         data->ver = (ver >> 8) & 0xff;
328
329         qoriq_tmu_init_device(data);    /* TMU initialization */
330
331         ret = qoriq_tmu_calibration(dev, data); /* TMU calibration */
332         if (ret < 0)
333                 return ret;
334
335         ret = qoriq_tmu_register_tmu_zone(dev, data);
336         if (ret < 0) {
337                 dev_err(dev, "Failed to register sensors\n");
338                 return ret;
339         }
340
341         platform_set_drvdata(pdev, data);
342
343         return 0;
344 }
345
346 static int __maybe_unused qoriq_tmu_suspend(struct device *dev)
347 {
348         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
349         int ret;
350
351         ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0);
352         if (ret)
353                 return ret;
354
355         clk_disable_unprepare(data->clk);
356
357         return 0;
358 }
359
360 static int __maybe_unused qoriq_tmu_resume(struct device *dev)
361 {
362         int ret;
363         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
364
365         ret = clk_prepare_enable(data->clk);
366         if (ret)
367                 return ret;
368
369         /* Enable monitoring */
370         return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME);
371 }
372
373 static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
374                          qoriq_tmu_suspend, qoriq_tmu_resume);
375
376 static const struct of_device_id qoriq_tmu_match[] = {
377         { .compatible = "fsl,qoriq-tmu", },
378         { .compatible = "fsl,imx8mq-tmu", },
379         {},
380 };
381 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
382
383 static struct platform_driver qoriq_tmu = {
384         .driver = {
385                 .name           = "qoriq_thermal",
386                 .pm             = &qoriq_tmu_pm_ops,
387                 .of_match_table = qoriq_tmu_match,
388         },
389         .probe  = qoriq_tmu_probe,
390 };
391 module_platform_driver(qoriq_tmu);
392
393 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
394 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
395 MODULE_LICENSE("GPL v2");