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1 | /* |
2 | * exynos4_tmu.c - Samsung EXYNOS4 TMU (Thermal Management Unit) | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics | |
5 | * Donggeun Kim <dg77.kim@samsung.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/err.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/interrupt.h> | |
29 | #include <linux/clk.h> | |
30 | #include <linux/workqueue.h> | |
31 | #include <linux/sysfs.h> | |
32 | #include <linux/kobject.h> | |
33 | #include <linux/io.h> | |
34 | #include <linux/mutex.h> | |
35 | ||
36 | #include <linux/hwmon.h> | |
37 | #include <linux/hwmon-sysfs.h> | |
38 | ||
39 | #include <linux/platform_data/exynos4_tmu.h> | |
40 | ||
41 | #define EXYNOS4_TMU_REG_TRIMINFO 0x0 | |
42 | #define EXYNOS4_TMU_REG_CONTROL 0x20 | |
43 | #define EXYNOS4_TMU_REG_STATUS 0x28 | |
44 | #define EXYNOS4_TMU_REG_CURRENT_TEMP 0x40 | |
45 | #define EXYNOS4_TMU_REG_THRESHOLD_TEMP 0x44 | |
46 | #define EXYNOS4_TMU_REG_TRIG_LEVEL0 0x50 | |
47 | #define EXYNOS4_TMU_REG_TRIG_LEVEL1 0x54 | |
48 | #define EXYNOS4_TMU_REG_TRIG_LEVEL2 0x58 | |
49 | #define EXYNOS4_TMU_REG_TRIG_LEVEL3 0x5C | |
50 | #define EXYNOS4_TMU_REG_PAST_TEMP0 0x60 | |
51 | #define EXYNOS4_TMU_REG_PAST_TEMP1 0x64 | |
52 | #define EXYNOS4_TMU_REG_PAST_TEMP2 0x68 | |
53 | #define EXYNOS4_TMU_REG_PAST_TEMP3 0x6C | |
54 | #define EXYNOS4_TMU_REG_INTEN 0x70 | |
55 | #define EXYNOS4_TMU_REG_INTSTAT 0x74 | |
56 | #define EXYNOS4_TMU_REG_INTCLEAR 0x78 | |
57 | ||
58 | #define EXYNOS4_TMU_GAIN_SHIFT 8 | |
59 | #define EXYNOS4_TMU_REF_VOLTAGE_SHIFT 24 | |
60 | ||
61 | #define EXYNOS4_TMU_TRIM_TEMP_MASK 0xff | |
62 | #define EXYNOS4_TMU_CORE_ON 3 | |
63 | #define EXYNOS4_TMU_CORE_OFF 2 | |
64 | #define EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET 50 | |
65 | #define EXYNOS4_TMU_TRIG_LEVEL0_MASK 0x1 | |
66 | #define EXYNOS4_TMU_TRIG_LEVEL1_MASK 0x10 | |
67 | #define EXYNOS4_TMU_TRIG_LEVEL2_MASK 0x100 | |
68 | #define EXYNOS4_TMU_TRIG_LEVEL3_MASK 0x1000 | |
69 | #define EXYNOS4_TMU_INTCLEAR_VAL 0x1111 | |
70 | ||
71 | struct exynos4_tmu_data { | |
72 | struct exynos4_tmu_platform_data *pdata; | |
73 | struct device *hwmon_dev; | |
74 | struct resource *mem; | |
75 | void __iomem *base; | |
76 | int irq; | |
77 | struct work_struct irq_work; | |
78 | struct mutex lock; | |
79 | struct clk *clk; | |
80 | u8 temp_error1, temp_error2; | |
81 | }; | |
82 | ||
83 | /* | |
84 | * TMU treats temperature as a mapped temperature code. | |
85 | * The temperature is converted differently depending on the calibration type. | |
86 | */ | |
87 | static int temp_to_code(struct exynos4_tmu_data *data, u8 temp) | |
88 | { | |
89 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
90 | int temp_code; | |
91 | ||
92 | /* temp should range between 25 and 125 */ | |
93 | if (temp < 25 || temp > 125) { | |
94 | temp_code = -EINVAL; | |
95 | goto out; | |
96 | } | |
97 | ||
98 | switch (pdata->cal_type) { | |
99 | case TYPE_TWO_POINT_TRIMMING: | |
100 | temp_code = (temp - 25) * | |
101 | (data->temp_error2 - data->temp_error1) / | |
102 | (85 - 25) + data->temp_error1; | |
103 | break; | |
104 | case TYPE_ONE_POINT_TRIMMING: | |
105 | temp_code = temp + data->temp_error1 - 25; | |
106 | break; | |
107 | default: | |
108 | temp_code = temp + EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; | |
109 | break; | |
110 | } | |
111 | out: | |
112 | return temp_code; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Calculate a temperature value from a temperature code. | |
117 | * The unit of the temperature is degree Celsius. | |
118 | */ | |
119 | static int code_to_temp(struct exynos4_tmu_data *data, u8 temp_code) | |
120 | { | |
121 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
122 | int temp; | |
123 | ||
124 | /* temp_code should range between 75 and 175 */ | |
125 | if (temp_code < 75 || temp_code > 175) { | |
126 | temp = -ENODATA; | |
127 | goto out; | |
128 | } | |
129 | ||
130 | switch (pdata->cal_type) { | |
131 | case TYPE_TWO_POINT_TRIMMING: | |
132 | temp = (temp_code - data->temp_error1) * (85 - 25) / | |
133 | (data->temp_error2 - data->temp_error1) + 25; | |
134 | break; | |
135 | case TYPE_ONE_POINT_TRIMMING: | |
136 | temp = temp_code - data->temp_error1 + 25; | |
137 | break; | |
138 | default: | |
139 | temp = temp_code - EXYNOS4_TMU_DEF_CODE_TO_TEMP_OFFSET; | |
140 | break; | |
141 | } | |
142 | out: | |
143 | return temp; | |
144 | } | |
145 | ||
146 | static int exynos4_tmu_initialize(struct platform_device *pdev) | |
147 | { | |
148 | struct exynos4_tmu_data *data = platform_get_drvdata(pdev); | |
149 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
150 | unsigned int status, trim_info; | |
151 | int ret = 0, threshold_code; | |
152 | ||
153 | mutex_lock(&data->lock); | |
154 | clk_enable(data->clk); | |
155 | ||
156 | status = readb(data->base + EXYNOS4_TMU_REG_STATUS); | |
157 | if (!status) { | |
158 | ret = -EBUSY; | |
159 | goto out; | |
160 | } | |
161 | ||
162 | /* Save trimming info in order to perform calibration */ | |
163 | trim_info = readl(data->base + EXYNOS4_TMU_REG_TRIMINFO); | |
164 | data->temp_error1 = trim_info & EXYNOS4_TMU_TRIM_TEMP_MASK; | |
165 | data->temp_error2 = ((trim_info >> 8) & EXYNOS4_TMU_TRIM_TEMP_MASK); | |
166 | ||
167 | /* Write temperature code for threshold */ | |
168 | threshold_code = temp_to_code(data, pdata->threshold); | |
169 | if (threshold_code < 0) { | |
170 | ret = threshold_code; | |
171 | goto out; | |
172 | } | |
173 | writeb(threshold_code, | |
174 | data->base + EXYNOS4_TMU_REG_THRESHOLD_TEMP); | |
175 | ||
176 | writeb(pdata->trigger_levels[0], | |
177 | data->base + EXYNOS4_TMU_REG_TRIG_LEVEL0); | |
178 | writeb(pdata->trigger_levels[1], | |
179 | data->base + EXYNOS4_TMU_REG_TRIG_LEVEL1); | |
180 | writeb(pdata->trigger_levels[2], | |
181 | data->base + EXYNOS4_TMU_REG_TRIG_LEVEL2); | |
182 | writeb(pdata->trigger_levels[3], | |
183 | data->base + EXYNOS4_TMU_REG_TRIG_LEVEL3); | |
184 | ||
185 | writel(EXYNOS4_TMU_INTCLEAR_VAL, | |
186 | data->base + EXYNOS4_TMU_REG_INTCLEAR); | |
187 | out: | |
188 | clk_disable(data->clk); | |
189 | mutex_unlock(&data->lock); | |
190 | ||
191 | return ret; | |
192 | } | |
193 | ||
194 | static void exynos4_tmu_control(struct platform_device *pdev, bool on) | |
195 | { | |
196 | struct exynos4_tmu_data *data = platform_get_drvdata(pdev); | |
197 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
198 | unsigned int con, interrupt_en; | |
199 | ||
200 | mutex_lock(&data->lock); | |
201 | clk_enable(data->clk); | |
202 | ||
203 | con = pdata->reference_voltage << EXYNOS4_TMU_REF_VOLTAGE_SHIFT | | |
204 | pdata->gain << EXYNOS4_TMU_GAIN_SHIFT; | |
205 | if (on) { | |
206 | con |= EXYNOS4_TMU_CORE_ON; | |
207 | interrupt_en = pdata->trigger_level3_en << 12 | | |
208 | pdata->trigger_level2_en << 8 | | |
209 | pdata->trigger_level1_en << 4 | | |
210 | pdata->trigger_level0_en; | |
211 | } else { | |
212 | con |= EXYNOS4_TMU_CORE_OFF; | |
213 | interrupt_en = 0; /* Disable all interrupts */ | |
214 | } | |
215 | writel(interrupt_en, data->base + EXYNOS4_TMU_REG_INTEN); | |
216 | writel(con, data->base + EXYNOS4_TMU_REG_CONTROL); | |
217 | ||
218 | clk_disable(data->clk); | |
219 | mutex_unlock(&data->lock); | |
220 | } | |
221 | ||
222 | static int exynos4_tmu_read(struct exynos4_tmu_data *data) | |
223 | { | |
224 | u8 temp_code; | |
225 | int temp; | |
226 | ||
227 | mutex_lock(&data->lock); | |
228 | clk_enable(data->clk); | |
229 | ||
230 | temp_code = readb(data->base + EXYNOS4_TMU_REG_CURRENT_TEMP); | |
231 | temp = code_to_temp(data, temp_code); | |
232 | ||
233 | clk_disable(data->clk); | |
234 | mutex_unlock(&data->lock); | |
235 | ||
236 | return temp; | |
237 | } | |
238 | ||
239 | static void exynos4_tmu_work(struct work_struct *work) | |
240 | { | |
241 | struct exynos4_tmu_data *data = container_of(work, | |
242 | struct exynos4_tmu_data, irq_work); | |
243 | ||
244 | mutex_lock(&data->lock); | |
245 | clk_enable(data->clk); | |
246 | ||
247 | writel(EXYNOS4_TMU_INTCLEAR_VAL, data->base + EXYNOS4_TMU_REG_INTCLEAR); | |
248 | ||
249 | kobject_uevent(&data->hwmon_dev->kobj, KOBJ_CHANGE); | |
250 | ||
251 | enable_irq(data->irq); | |
252 | ||
253 | clk_disable(data->clk); | |
254 | mutex_unlock(&data->lock); | |
255 | } | |
256 | ||
257 | static irqreturn_t exynos4_tmu_irq(int irq, void *id) | |
258 | { | |
259 | struct exynos4_tmu_data *data = id; | |
260 | ||
261 | disable_irq_nosync(irq); | |
262 | schedule_work(&data->irq_work); | |
263 | ||
264 | return IRQ_HANDLED; | |
265 | } | |
266 | ||
267 | static ssize_t exynos4_tmu_show_name(struct device *dev, | |
268 | struct device_attribute *attr, char *buf) | |
269 | { | |
270 | return sprintf(buf, "exynos4-tmu\n"); | |
271 | } | |
272 | ||
273 | static ssize_t exynos4_tmu_show_temp(struct device *dev, | |
274 | struct device_attribute *attr, char *buf) | |
275 | { | |
276 | struct exynos4_tmu_data *data = dev_get_drvdata(dev); | |
277 | int ret; | |
278 | ||
279 | ret = exynos4_tmu_read(data); | |
280 | if (ret < 0) | |
281 | return ret; | |
282 | ||
283 | /* convert from degree Celsius to millidegree Celsius */ | |
284 | return sprintf(buf, "%d\n", ret * 1000); | |
285 | } | |
286 | ||
287 | static ssize_t exynos4_tmu_show_alarm(struct device *dev, | |
288 | struct device_attribute *devattr, char *buf) | |
289 | { | |
290 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
291 | struct exynos4_tmu_data *data = dev_get_drvdata(dev); | |
292 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
293 | int temp; | |
294 | unsigned int trigger_level; | |
295 | ||
296 | temp = exynos4_tmu_read(data); | |
297 | if (temp < 0) | |
298 | return temp; | |
299 | ||
300 | trigger_level = pdata->threshold + pdata->trigger_levels[attr->index]; | |
301 | ||
302 | return sprintf(buf, "%d\n", !!(temp > trigger_level)); | |
303 | } | |
304 | ||
305 | static ssize_t exynos4_tmu_show_level(struct device *dev, | |
306 | struct device_attribute *devattr, char *buf) | |
307 | { | |
308 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
309 | struct exynos4_tmu_data *data = dev_get_drvdata(dev); | |
310 | struct exynos4_tmu_platform_data *pdata = data->pdata; | |
311 | unsigned int temp = pdata->threshold + | |
312 | pdata->trigger_levels[attr->index]; | |
313 | ||
314 | return sprintf(buf, "%u\n", temp * 1000); | |
315 | } | |
316 | ||
317 | static DEVICE_ATTR(name, S_IRUGO, exynos4_tmu_show_name, NULL); | |
318 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, exynos4_tmu_show_temp, NULL, 0); | |
319 | ||
320 | static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, | |
321 | exynos4_tmu_show_alarm, NULL, 1); | |
322 | static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, | |
323 | exynos4_tmu_show_alarm, NULL, 2); | |
324 | static SENSOR_DEVICE_ATTR(temp1_emergency_alarm, S_IRUGO, | |
325 | exynos4_tmu_show_alarm, NULL, 3); | |
326 | ||
327 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, exynos4_tmu_show_level, NULL, 1); | |
328 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, exynos4_tmu_show_level, NULL, 2); | |
329 | static SENSOR_DEVICE_ATTR(temp1_emergency, S_IRUGO, | |
330 | exynos4_tmu_show_level, NULL, 3); | |
331 | ||
332 | static struct attribute *exynos4_tmu_attributes[] = { | |
333 | &dev_attr_name.attr, | |
334 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
335 | &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, | |
336 | &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, | |
337 | &sensor_dev_attr_temp1_emergency_alarm.dev_attr.attr, | |
338 | &sensor_dev_attr_temp1_max.dev_attr.attr, | |
339 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
340 | &sensor_dev_attr_temp1_emergency.dev_attr.attr, | |
341 | NULL, | |
342 | }; | |
343 | ||
344 | static const struct attribute_group exynos4_tmu_attr_group = { | |
345 | .attrs = exynos4_tmu_attributes, | |
346 | }; | |
347 | ||
348 | static int __devinit exynos4_tmu_probe(struct platform_device *pdev) | |
349 | { | |
350 | struct exynos4_tmu_data *data; | |
351 | struct exynos4_tmu_platform_data *pdata = pdev->dev.platform_data; | |
352 | int ret; | |
353 | ||
354 | if (!pdata) { | |
355 | dev_err(&pdev->dev, "No platform init data supplied.\n"); | |
356 | return -ENODEV; | |
357 | } | |
358 | ||
359 | data = kzalloc(sizeof(struct exynos4_tmu_data), GFP_KERNEL); | |
360 | if (!data) { | |
361 | dev_err(&pdev->dev, "Failed to allocate driver structure\n"); | |
362 | return -ENOMEM; | |
363 | } | |
364 | ||
365 | data->irq = platform_get_irq(pdev, 0); | |
366 | if (data->irq < 0) { | |
367 | ret = data->irq; | |
368 | dev_err(&pdev->dev, "Failed to get platform irq\n"); | |
369 | goto err_free; | |
370 | } | |
371 | ||
372 | INIT_WORK(&data->irq_work, exynos4_tmu_work); | |
373 | ||
374 | data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
375 | if (!data->mem) { | |
376 | ret = -ENOENT; | |
377 | dev_err(&pdev->dev, "Failed to get platform resource\n"); | |
378 | goto err_free; | |
379 | } | |
380 | ||
381 | data->mem = request_mem_region(data->mem->start, | |
382 | resource_size(data->mem), pdev->name); | |
383 | if (!data->mem) { | |
384 | ret = -ENODEV; | |
385 | dev_err(&pdev->dev, "Failed to request memory region\n"); | |
386 | goto err_free; | |
387 | } | |
388 | ||
389 | data->base = ioremap(data->mem->start, resource_size(data->mem)); | |
390 | if (!data->base) { | |
391 | ret = -ENODEV; | |
392 | dev_err(&pdev->dev, "Failed to ioremap memory\n"); | |
393 | goto err_mem_region; | |
394 | } | |
395 | ||
396 | ret = request_irq(data->irq, exynos4_tmu_irq, | |
3f67f835 | 397 | IRQF_TRIGGER_RISING, |
9d97e5c8 DK |
398 | "exynos4-tmu", data); |
399 | if (ret) { | |
400 | dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq); | |
401 | goto err_io_remap; | |
402 | } | |
403 | ||
404 | data->clk = clk_get(NULL, "tmu_apbif"); | |
405 | if (IS_ERR(data->clk)) { | |
406 | ret = PTR_ERR(data->clk); | |
407 | dev_err(&pdev->dev, "Failed to get clock\n"); | |
408 | goto err_irq; | |
409 | } | |
410 | ||
411 | data->pdata = pdata; | |
412 | platform_set_drvdata(pdev, data); | |
413 | mutex_init(&data->lock); | |
414 | ||
415 | ret = exynos4_tmu_initialize(pdev); | |
416 | if (ret) { | |
417 | dev_err(&pdev->dev, "Failed to initialize TMU\n"); | |
418 | goto err_clk; | |
419 | } | |
420 | ||
421 | ret = sysfs_create_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); | |
422 | if (ret) { | |
423 | dev_err(&pdev->dev, "Failed to create sysfs group\n"); | |
424 | goto err_clk; | |
425 | } | |
426 | ||
427 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
428 | if (IS_ERR(data->hwmon_dev)) { | |
429 | ret = PTR_ERR(data->hwmon_dev); | |
430 | dev_err(&pdev->dev, "Failed to register hwmon device\n"); | |
431 | goto err_create_group; | |
432 | } | |
433 | ||
434 | exynos4_tmu_control(pdev, true); | |
435 | ||
436 | return 0; | |
437 | ||
438 | err_create_group: | |
439 | sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); | |
440 | err_clk: | |
441 | platform_set_drvdata(pdev, NULL); | |
442 | clk_put(data->clk); | |
443 | err_irq: | |
444 | free_irq(data->irq, data); | |
445 | err_io_remap: | |
446 | iounmap(data->base); | |
447 | err_mem_region: | |
448 | release_mem_region(data->mem->start, resource_size(data->mem)); | |
449 | err_free: | |
450 | kfree(data); | |
451 | ||
452 | return ret; | |
453 | } | |
454 | ||
455 | static int __devexit exynos4_tmu_remove(struct platform_device *pdev) | |
456 | { | |
457 | struct exynos4_tmu_data *data = platform_get_drvdata(pdev); | |
458 | ||
459 | exynos4_tmu_control(pdev, false); | |
460 | ||
461 | hwmon_device_unregister(data->hwmon_dev); | |
462 | sysfs_remove_group(&pdev->dev.kobj, &exynos4_tmu_attr_group); | |
463 | ||
464 | clk_put(data->clk); | |
465 | ||
466 | free_irq(data->irq, data); | |
467 | ||
468 | iounmap(data->base); | |
469 | release_mem_region(data->mem->start, resource_size(data->mem)); | |
470 | ||
471 | platform_set_drvdata(pdev, NULL); | |
472 | ||
473 | kfree(data); | |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
478 | #ifdef CONFIG_PM | |
479 | static int exynos4_tmu_suspend(struct platform_device *pdev, pm_message_t state) | |
480 | { | |
481 | exynos4_tmu_control(pdev, false); | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
486 | static int exynos4_tmu_resume(struct platform_device *pdev) | |
487 | { | |
488 | exynos4_tmu_initialize(pdev); | |
489 | exynos4_tmu_control(pdev, true); | |
490 | ||
491 | return 0; | |
492 | } | |
493 | #else | |
494 | #define exynos4_tmu_suspend NULL | |
495 | #define exynos4_tmu_resume NULL | |
496 | #endif | |
497 | ||
498 | static struct platform_driver exynos4_tmu_driver = { | |
499 | .driver = { | |
500 | .name = "exynos4-tmu", | |
501 | .owner = THIS_MODULE, | |
502 | }, | |
503 | .probe = exynos4_tmu_probe, | |
504 | .remove = __devexit_p(exynos4_tmu_remove), | |
505 | .suspend = exynos4_tmu_suspend, | |
506 | .resume = exynos4_tmu_resume, | |
507 | }; | |
508 | ||
509 | static int __init exynos4_tmu_driver_init(void) | |
510 | { | |
511 | return platform_driver_register(&exynos4_tmu_driver); | |
512 | } | |
513 | module_init(exynos4_tmu_driver_init); | |
514 | ||
515 | static void __exit exynos4_tmu_driver_exit(void) | |
516 | { | |
517 | platform_driver_unregister(&exynos4_tmu_driver); | |
518 | } | |
519 | module_exit(exynos4_tmu_driver_exit); | |
520 | ||
521 | MODULE_DESCRIPTION("EXYNOS4 TMU Driver"); | |
522 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
523 | MODULE_LICENSE("GPL"); | |
524 | MODULE_ALIAS("platform:exynos4-tmu"); |