Commit | Line | Data |
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8feaf0ce | 1 | /* |
03e859d3 | 2 | * TI Bandgap temperature sensor driver |
8feaf0ce EV |
3 | * |
4 | * Copyright (C) 2011-2012 Texas Instruments Incorporated - http://www.ti.com/ | |
5 | * Author: J Keerthy <j-keerthy@ti.com> | |
6 | * Author: Moiz Sonasath <m-sonasath@ti.com> | |
7 | * Couple of fixes, DT and MFD adaptation: | |
8 | * Eduardo Valentin <eduardo.valentin@ti.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * version 2 as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
22 | * 02110-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/export.h> | |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/clk.h> | |
32 | #include <linux/gpio.h> | |
33 | #include <linux/platform_device.h> | |
34 | #include <linux/err.h> | |
35 | #include <linux/types.h> | |
ebf0bd52 | 36 | #include <linux/spinlock.h> |
8feaf0ce EV |
37 | #include <linux/reboot.h> |
38 | #include <linux/of_device.h> | |
39 | #include <linux/of_platform.h> | |
40 | #include <linux/of_irq.h> | |
57d16171 | 41 | #include <linux/of_gpio.h> |
2aeeb8ac | 42 | #include <linux/io.h> |
8feaf0ce | 43 | |
7372add4 | 44 | #include "ti-bandgap.h" |
8feaf0ce | 45 | |
8abbe71e EV |
46 | /*** Helper functions to access registers and their bitfields ***/ |
47 | ||
9c468aa2 | 48 | /** |
03e859d3 EV |
49 | * ti_bandgap_readl() - simple read helper function |
50 | * @bgp: pointer to ti_bandgap structure | |
9c468aa2 EV |
51 | * @reg: desired register (offset) to be read |
52 | * | |
53 | * Helper function to read bandgap registers. It uses the io remapped area. | |
169e8d03 | 54 | * Return: the register value. |
9c468aa2 | 55 | */ |
03e859d3 | 56 | static u32 ti_bandgap_readl(struct ti_bandgap *bgp, u32 reg) |
8feaf0ce | 57 | { |
d7f080e6 | 58 | return readl(bgp->base + reg); |
8feaf0ce EV |
59 | } |
60 | ||
9c468aa2 | 61 | /** |
03e859d3 EV |
62 | * ti_bandgap_writel() - simple write helper function |
63 | * @bgp: pointer to ti_bandgap structure | |
9c468aa2 EV |
64 | * @val: desired register value to be written |
65 | * @reg: desired register (offset) to be written | |
66 | * | |
67 | * Helper function to write bandgap registers. It uses the io remapped area. | |
68 | */ | |
03e859d3 | 69 | static void ti_bandgap_writel(struct ti_bandgap *bgp, u32 val, u32 reg) |
8feaf0ce | 70 | { |
d7f080e6 | 71 | writel(val, bgp->base + reg); |
8feaf0ce EV |
72 | } |
73 | ||
9c468aa2 EV |
74 | /** |
75 | * DOC: macro to update bits. | |
76 | * | |
77 | * RMW_BITS() - used to read, modify and update bandgap bitfields. | |
78 | * The value passed will be shifted. | |
79 | */ | |
d7f080e6 | 80 | #define RMW_BITS(bgp, id, reg, mask, val) \ |
d3c291ab EV |
81 | do { \ |
82 | struct temp_sensor_registers *t; \ | |
83 | u32 r; \ | |
84 | \ | |
d7f080e6 | 85 | t = bgp->conf->sensors[(id)].registers; \ |
03e859d3 | 86 | r = ti_bandgap_readl(bgp, t->reg); \ |
d3c291ab EV |
87 | r &= ~t->mask; \ |
88 | r |= (val) << __ffs(t->mask); \ | |
03e859d3 | 89 | ti_bandgap_writel(bgp, r, t->reg); \ |
d3c291ab EV |
90 | } while (0) |
91 | ||
6ab52402 EV |
92 | /*** Basic helper functions ***/ |
93 | ||
7a556e6a | 94 | /** |
03e859d3 EV |
95 | * ti_bandgap_power() - controls the power state of a bandgap device |
96 | * @bgp: pointer to ti_bandgap structure | |
7a556e6a EV |
97 | * @on: desired power state (1 - on, 0 - off) |
98 | * | |
99 | * Used to power on/off a bandgap device instance. Only used on those | |
100 | * that features tempsoff bit. | |
169e8d03 NM |
101 | * |
102 | * Return: 0 on success, -ENOTSUPP if tempsoff is not supported. | |
7a556e6a | 103 | */ |
03e859d3 | 104 | static int ti_bandgap_power(struct ti_bandgap *bgp, bool on) |
8feaf0ce | 105 | { |
422a3063 | 106 | int i, ret = 0; |
8feaf0ce | 107 | |
422a3063 EV |
108 | if (!TI_BANDGAP_HAS(bgp, POWER_SWITCH)) { |
109 | ret = -ENOTSUPP; | |
3d84e529 | 110 | goto exit; |
422a3063 | 111 | } |
8feaf0ce | 112 | |
d7f080e6 | 113 | for (i = 0; i < bgp->conf->sensor_count; i++) |
8feaf0ce | 114 | /* active on 0 */ |
d7f080e6 | 115 | RMW_BITS(bgp, i, temp_sensor_ctrl, bgap_tempsoff_mask, !on); |
8feaf0ce | 116 | |
3d84e529 | 117 | exit: |
422a3063 | 118 | return ret; |
8feaf0ce EV |
119 | } |
120 | ||
4a6554ed | 121 | /** |
03e859d3 EV |
122 | * ti_bandgap_read_temp() - helper function to read sensor temperature |
123 | * @bgp: pointer to ti_bandgap structure | |
4a6554ed EV |
124 | * @id: bandgap sensor id |
125 | * | |
126 | * Function to concentrate the steps to read sensor temperature register. | |
127 | * This function is desired because, depending on bandgap device version, | |
128 | * it might be needed to freeze the bandgap state machine, before fetching | |
129 | * the register value. | |
169e8d03 NM |
130 | * |
131 | * Return: temperature in ADC values. | |
4a6554ed | 132 | */ |
03e859d3 | 133 | static u32 ti_bandgap_read_temp(struct ti_bandgap *bgp, int id) |
194a54f0 EV |
134 | { |
135 | struct temp_sensor_registers *tsr; | |
d3c291ab | 136 | u32 temp, reg; |
194a54f0 | 137 | |
d7f080e6 | 138 | tsr = bgp->conf->sensors[id].registers; |
194a54f0 EV |
139 | reg = tsr->temp_sensor_ctrl; |
140 | ||
03e859d3 | 141 | if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) { |
d7f080e6 | 142 | RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1); |
194a54f0 EV |
143 | /* |
144 | * In case we cannot read from cur_dtemp / dtemp_0, | |
145 | * then we read from the last valid temp read | |
146 | */ | |
147 | reg = tsr->ctrl_dtemp_1; | |
148 | } | |
149 | ||
150 | /* read temperature */ | |
03e859d3 | 151 | temp = ti_bandgap_readl(bgp, reg); |
194a54f0 EV |
152 | temp &= tsr->bgap_dtemp_mask; |
153 | ||
03e859d3 | 154 | if (TI_BANDGAP_HAS(bgp, FREEZE_BIT)) |
d7f080e6 | 155 | RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0); |
194a54f0 EV |
156 | |
157 | return temp; | |
158 | } | |
159 | ||
fb65b88a EV |
160 | /*** IRQ handlers ***/ |
161 | ||
ee07d55a | 162 | /** |
03e859d3 | 163 | * ti_bandgap_talert_irq_handler() - handles Temperature alert IRQs |
ee07d55a | 164 | * @irq: IRQ number |
03e859d3 | 165 | * @data: private data (struct ti_bandgap *) |
ee07d55a EV |
166 | * |
167 | * This is the Talert handler. Use it only if bandgap device features | |
168 | * HAS(TALERT). This handler goes over all sensors and checks their | |
169 | * conditions and acts accordingly. In case there are events pending, | |
170 | * it will reset the event mask to wait for the opposite event (next event). | |
171 | * Every time there is a new event, it will be reported to thermal layer. | |
169e8d03 NM |
172 | * |
173 | * Return: IRQ_HANDLED | |
ee07d55a | 174 | */ |
03e859d3 | 175 | static irqreturn_t ti_bandgap_talert_irq_handler(int irq, void *data) |
8feaf0ce | 176 | { |
03e859d3 | 177 | struct ti_bandgap *bgp = data; |
8feaf0ce | 178 | struct temp_sensor_registers *tsr; |
194a54f0 | 179 | u32 t_hot = 0, t_cold = 0, ctrl; |
8feaf0ce EV |
180 | int i; |
181 | ||
d7f080e6 EV |
182 | spin_lock(&bgp->lock); |
183 | for (i = 0; i < bgp->conf->sensor_count; i++) { | |
184 | tsr = bgp->conf->sensors[i].registers; | |
03e859d3 | 185 | ctrl = ti_bandgap_readl(bgp, tsr->bgap_status); |
e555c956 EV |
186 | |
187 | /* Read the status of t_hot */ | |
188 | t_hot = ctrl & tsr->status_hot_mask; | |
8feaf0ce EV |
189 | |
190 | /* Read the status of t_cold */ | |
e555c956 | 191 | t_cold = ctrl & tsr->status_cold_mask; |
8feaf0ce EV |
192 | |
193 | if (!t_cold && !t_hot) | |
194 | continue; | |
195 | ||
03e859d3 | 196 | ctrl = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl); |
8feaf0ce EV |
197 | /* |
198 | * One TALERT interrupt: Two sources | |
199 | * If the interrupt is due to t_hot then mask t_hot and | |
200 | * and unmask t_cold else mask t_cold and unmask t_hot | |
201 | */ | |
202 | if (t_hot) { | |
203 | ctrl &= ~tsr->mask_hot_mask; | |
204 | ctrl |= tsr->mask_cold_mask; | |
205 | } else if (t_cold) { | |
206 | ctrl &= ~tsr->mask_cold_mask; | |
207 | ctrl |= tsr->mask_hot_mask; | |
208 | } | |
209 | ||
03e859d3 | 210 | ti_bandgap_writel(bgp, ctrl, tsr->bgap_mask_ctrl); |
8feaf0ce | 211 | |
d7f080e6 | 212 | dev_dbg(bgp->dev, |
71e303f5 | 213 | "%s: IRQ from %s sensor: hotevent %d coldevent %d\n", |
d7f080e6 | 214 | __func__, bgp->conf->sensors[i].domain, |
71e303f5 EV |
215 | t_hot, t_cold); |
216 | ||
8feaf0ce | 217 | /* report temperature to whom may concern */ |
d7f080e6 EV |
218 | if (bgp->conf->report_temperature) |
219 | bgp->conf->report_temperature(bgp, i); | |
8feaf0ce | 220 | } |
d7f080e6 | 221 | spin_unlock(&bgp->lock); |
8feaf0ce EV |
222 | |
223 | return IRQ_HANDLED; | |
224 | } | |
225 | ||
79857cd2 | 226 | /** |
03e859d3 | 227 | * ti_bandgap_tshut_irq_handler() - handles Temperature shutdown signal |
79857cd2 EV |
228 | * @irq: IRQ number |
229 | * @data: private data (unused) | |
230 | * | |
231 | * This is the Tshut handler. Use it only if bandgap device features | |
232 | * HAS(TSHUT). If any sensor fires the Tshut signal, we simply shutdown | |
233 | * the system. | |
169e8d03 NM |
234 | * |
235 | * Return: IRQ_HANDLED | |
79857cd2 | 236 | */ |
03e859d3 | 237 | static irqreturn_t ti_bandgap_tshut_irq_handler(int irq, void *data) |
8feaf0ce | 238 | { |
b3bf0e90 RR |
239 | pr_emerg("%s: TSHUT temperature reached. Needs shut down...\n", |
240 | __func__); | |
241 | ||
8feaf0ce EV |
242 | orderly_poweroff(true); |
243 | ||
244 | return IRQ_HANDLED; | |
245 | } | |
246 | ||
2f6af4b3 EV |
247 | /*** Helper functions which manipulate conversion ADC <-> mi Celsius ***/ |
248 | ||
2577e937 | 249 | /** |
03e859d3 EV |
250 | * ti_bandgap_adc_to_mcelsius() - converts an ADC value to mCelsius scale |
251 | * @bgp: struct ti_bandgap pointer | |
2577e937 EV |
252 | * @adc_val: value in ADC representation |
253 | * @t: address where to write the resulting temperature in mCelsius | |
254 | * | |
255 | * Simple conversion from ADC representation to mCelsius. In case the ADC value | |
256 | * is out of the ADC conv table range, it returns -ERANGE, 0 on success. | |
257 | * The conversion table is indexed by the ADC values. | |
169e8d03 NM |
258 | * |
259 | * Return: 0 if conversion was successful, else -ERANGE in case the @adc_val | |
260 | * argument is out of the ADC conv table range. | |
2577e937 | 261 | */ |
8feaf0ce | 262 | static |
03e859d3 | 263 | int ti_bandgap_adc_to_mcelsius(struct ti_bandgap *bgp, int adc_val, int *t) |
8feaf0ce | 264 | { |
9879b2c4 | 265 | const struct ti_bandgap_data *conf = bgp->conf; |
20470599 | 266 | int ret = 0; |
8feaf0ce EV |
267 | |
268 | /* look up for temperature in the table and return the temperature */ | |
26a70ed9 | 269 | if (adc_val < conf->adc_start_val || adc_val > conf->adc_end_val) { |
20470599 EV |
270 | ret = -ERANGE; |
271 | goto exit; | |
272 | } | |
8feaf0ce | 273 | |
d7f080e6 | 274 | *t = bgp->conf->conv_table[adc_val - conf->adc_start_val]; |
8feaf0ce | 275 | |
20470599 EV |
276 | exit: |
277 | return ret; | |
8feaf0ce EV |
278 | } |
279 | ||
e7f60b53 | 280 | /** |
03e859d3 EV |
281 | * ti_bandgap_mcelsius_to_adc() - converts a mCelsius value to ADC scale |
282 | * @bgp: struct ti_bandgap pointer | |
e7f60b53 EV |
283 | * @temp: value in mCelsius |
284 | * @adc: address where to write the resulting temperature in ADC representation | |
285 | * | |
286 | * Simple conversion from mCelsius to ADC values. In case the temp value | |
287 | * is out of the ADC conv table range, it returns -ERANGE, 0 on success. | |
288 | * The conversion table is indexed by the ADC values. | |
169e8d03 NM |
289 | * |
290 | * Return: 0 if conversion was successful, else -ERANGE in case the @temp | |
291 | * argument is out of the ADC conv table range. | |
e7f60b53 | 292 | */ |
e16f072d | 293 | static |
03e859d3 | 294 | int ti_bandgap_mcelsius_to_adc(struct ti_bandgap *bgp, long temp, int *adc) |
8feaf0ce | 295 | { |
9879b2c4 | 296 | const struct ti_bandgap_data *conf = bgp->conf; |
d7f080e6 | 297 | const int *conv_table = bgp->conf->conv_table; |
a619477f | 298 | int high, low, mid, ret = 0; |
8feaf0ce EV |
299 | |
300 | low = 0; | |
26a70ed9 | 301 | high = conf->adc_end_val - conf->adc_start_val; |
8feaf0ce EV |
302 | mid = (high + low) / 2; |
303 | ||
a619477f EV |
304 | if (temp < conv_table[low] || temp > conv_table[high]) { |
305 | ret = -ERANGE; | |
306 | goto exit; | |
307 | } | |
8feaf0ce EV |
308 | |
309 | while (low < high) { | |
c8a8f847 | 310 | if (temp < conv_table[mid]) |
8feaf0ce EV |
311 | high = mid - 1; |
312 | else | |
313 | low = mid + 1; | |
314 | mid = (low + high) / 2; | |
315 | } | |
316 | ||
26a70ed9 | 317 | *adc = conf->adc_start_val + low; |
8feaf0ce | 318 | |
a619477f EV |
319 | exit: |
320 | return ret; | |
8feaf0ce EV |
321 | } |
322 | ||
8a1cefe8 | 323 | /** |
03e859d3 EV |
324 | * ti_bandgap_add_hyst() - add hysteresis (in mCelsius) to an ADC value |
325 | * @bgp: struct ti_bandgap pointer | |
8a1cefe8 EV |
326 | * @adc_val: temperature value in ADC representation |
327 | * @hyst_val: hysteresis value in mCelsius | |
328 | * @sum: address where to write the resulting temperature (in ADC scale) | |
329 | * | |
330 | * Adds an hysteresis value (in mCelsius) to a ADC temperature value. | |
169e8d03 NM |
331 | * |
332 | * Return: 0 on success, -ERANGE otherwise. | |
8a1cefe8 | 333 | */ |
0f0ed7de | 334 | static |
03e859d3 EV |
335 | int ti_bandgap_add_hyst(struct ti_bandgap *bgp, int adc_val, int hyst_val, |
336 | u32 *sum) | |
0f0ed7de EV |
337 | { |
338 | int temp, ret; | |
339 | ||
340 | /* | |
341 | * Need to add in the mcelsius domain, so we have a temperature | |
342 | * the conv_table range | |
343 | */ | |
03e859d3 | 344 | ret = ti_bandgap_adc_to_mcelsius(bgp, adc_val, &temp); |
0f0ed7de EV |
345 | if (ret < 0) |
346 | goto exit; | |
347 | ||
348 | temp += hyst_val; | |
349 | ||
03e859d3 | 350 | ret = ti_bandgap_mcelsius_to_adc(bgp, temp, sum); |
0f0ed7de EV |
351 | |
352 | exit: | |
353 | return ret; | |
354 | } | |
355 | ||
f8ccce20 EV |
356 | /*** Helper functions handling device Alert/Shutdown signals ***/ |
357 | ||
f47f6d31 | 358 | /** |
03e859d3 EV |
359 | * ti_bandgap_unmask_interrupts() - unmasks the events of thot & tcold |
360 | * @bgp: struct ti_bandgap pointer | |
61603af3 | 361 | * @id: bandgap sensor id |
f47f6d31 EV |
362 | * @t_hot: hot temperature value to trigger alert signal |
363 | * @t_cold: cold temperature value to trigger alert signal | |
364 | * | |
365 | * Checks the requested t_hot and t_cold values and configures the IRQ event | |
366 | * masks accordingly. Call this function only if bandgap features HAS(TALERT). | |
367 | */ | |
03e859d3 EV |
368 | static void ti_bandgap_unmask_interrupts(struct ti_bandgap *bgp, int id, |
369 | u32 t_hot, u32 t_cold) | |
8feaf0ce EV |
370 | { |
371 | struct temp_sensor_registers *tsr; | |
372 | u32 temp, reg_val; | |
373 | ||
374 | /* Read the current on die temperature */ | |
03e859d3 | 375 | temp = ti_bandgap_read_temp(bgp, id); |
8feaf0ce | 376 | |
d7f080e6 | 377 | tsr = bgp->conf->sensors[id].registers; |
03e859d3 | 378 | reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl); |
194a54f0 | 379 | |
8feaf0ce EV |
380 | if (temp < t_hot) |
381 | reg_val |= tsr->mask_hot_mask; | |
382 | else | |
383 | reg_val &= ~tsr->mask_hot_mask; | |
384 | ||
385 | if (t_cold < temp) | |
386 | reg_val |= tsr->mask_cold_mask; | |
387 | else | |
388 | reg_val &= ~tsr->mask_cold_mask; | |
03e859d3 | 389 | ti_bandgap_writel(bgp, reg_val, tsr->bgap_mask_ctrl); |
8feaf0ce EV |
390 | } |
391 | ||
38d99e80 | 392 | /** |
03e859d3 EV |
393 | * ti_bandgap_update_alert_threshold() - sequence to update thresholds |
394 | * @bgp: struct ti_bandgap pointer | |
38d99e80 EV |
395 | * @id: bandgap sensor id |
396 | * @val: value (ADC) of a new threshold | |
397 | * @hot: desired threshold to be updated. true if threshold hot, false if | |
398 | * threshold cold | |
399 | * | |
400 | * It will program the required thresholds (hot and cold) for TALERT signal. | |
401 | * This function can be used to update t_hot or t_cold, depending on @hot value. | |
402 | * It checks the resulting t_hot and t_cold values, based on the new passed @val | |
403 | * and configures the thresholds so that t_hot is always greater than t_cold. | |
404 | * Call this function only if bandgap features HAS(TALERT). | |
169e8d03 NM |
405 | * |
406 | * Return: 0 if no error, else corresponding error | |
38d99e80 | 407 | */ |
03e859d3 EV |
408 | static int ti_bandgap_update_alert_threshold(struct ti_bandgap *bgp, int id, |
409 | int val, bool hot) | |
8feaf0ce | 410 | { |
d7f080e6 | 411 | struct temp_sensor_data *ts_data = bgp->conf->sensors[id].ts_data; |
8feaf0ce | 412 | struct temp_sensor_registers *tsr; |
56f132f7 EV |
413 | u32 thresh_val, reg_val, t_hot, t_cold; |
414 | int err = 0; | |
8feaf0ce | 415 | |
d7f080e6 | 416 | tsr = bgp->conf->sensors[id].registers; |
8feaf0ce | 417 | |
56f132f7 | 418 | /* obtain the current value */ |
03e859d3 | 419 | thresh_val = ti_bandgap_readl(bgp, tsr->bgap_threshold); |
56f132f7 EV |
420 | t_cold = (thresh_val & tsr->threshold_tcold_mask) >> |
421 | __ffs(tsr->threshold_tcold_mask); | |
422 | t_hot = (thresh_val & tsr->threshold_thot_mask) >> | |
423 | __ffs(tsr->threshold_thot_mask); | |
424 | if (hot) | |
425 | t_hot = val; | |
426 | else | |
427 | t_cold = val; | |
428 | ||
f5d43b7a | 429 | if (t_cold > t_hot) { |
56f132f7 | 430 | if (hot) |
03e859d3 EV |
431 | err = ti_bandgap_add_hyst(bgp, t_hot, |
432 | -ts_data->hyst_val, | |
433 | &t_cold); | |
56f132f7 | 434 | else |
03e859d3 EV |
435 | err = ti_bandgap_add_hyst(bgp, t_cold, |
436 | ts_data->hyst_val, | |
437 | &t_hot); | |
8feaf0ce EV |
438 | } |
439 | ||
56f132f7 | 440 | /* write the new threshold values */ |
0fb3c244 EV |
441 | reg_val = thresh_val & |
442 | ~(tsr->threshold_thot_mask | tsr->threshold_tcold_mask); | |
443 | reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask)) | | |
444 | (t_cold << __ffs(tsr->threshold_tcold_mask)); | |
03e859d3 | 445 | ti_bandgap_writel(bgp, reg_val, tsr->bgap_threshold); |
56f132f7 | 446 | |
8feaf0ce | 447 | if (err) { |
d7f080e6 | 448 | dev_err(bgp->dev, "failed to reprogram thot threshold\n"); |
56f132f7 EV |
449 | err = -EIO; |
450 | goto exit; | |
8feaf0ce EV |
451 | } |
452 | ||
03e859d3 | 453 | ti_bandgap_unmask_interrupts(bgp, id, t_hot, t_cold); |
56f132f7 EV |
454 | exit: |
455 | return err; | |
8feaf0ce EV |
456 | } |
457 | ||
e72b7bbd | 458 | /** |
03e859d3 EV |
459 | * ti_bandgap_validate() - helper to check the sanity of a struct ti_bandgap |
460 | * @bgp: struct ti_bandgap pointer | |
e72b7bbd EV |
461 | * @id: bandgap sensor id |
462 | * | |
463 | * Checks if the bandgap pointer is valid and if the sensor id is also | |
464 | * applicable. | |
169e8d03 NM |
465 | * |
466 | * Return: 0 if no errors, -EINVAL for invalid @bgp pointer or -ERANGE if | |
467 | * @id cannot index @bgp sensors. | |
e72b7bbd | 468 | */ |
03e859d3 | 469 | static inline int ti_bandgap_validate(struct ti_bandgap *bgp, int id) |
8feaf0ce | 470 | { |
56f132f7 | 471 | int ret = 0; |
8feaf0ce | 472 | |
0c12b5ac | 473 | if (!bgp || IS_ERR(bgp)) { |
56f132f7 EV |
474 | pr_err("%s: invalid bandgap pointer\n", __func__); |
475 | ret = -EINVAL; | |
476 | goto exit; | |
8feaf0ce EV |
477 | } |
478 | ||
d7f080e6 EV |
479 | if ((id < 0) || (id >= bgp->conf->sensor_count)) { |
480 | dev_err(bgp->dev, "%s: sensor id out of range (%d)\n", | |
56f132f7 EV |
481 | __func__, id); |
482 | ret = -ERANGE; | |
8feaf0ce EV |
483 | } |
484 | ||
56f132f7 EV |
485 | exit: |
486 | return ret; | |
8feaf0ce EV |
487 | } |
488 | ||
9efa93b0 | 489 | /** |
03e859d3 EV |
490 | * _ti_bandgap_write_threshold() - helper to update TALERT t_cold or t_hot |
491 | * @bgp: struct ti_bandgap pointer | |
9efa93b0 EV |
492 | * @id: bandgap sensor id |
493 | * @val: value (mCelsius) of a new threshold | |
494 | * @hot: desired threshold to be updated. true if threshold hot, false if | |
495 | * threshold cold | |
496 | * | |
497 | * It will update the required thresholds (hot and cold) for TALERT signal. | |
498 | * This function can be used to update t_hot or t_cold, depending on @hot value. | |
499 | * Validates the mCelsius range and update the requested threshold. | |
500 | * Call this function only if bandgap features HAS(TALERT). | |
169e8d03 NM |
501 | * |
502 | * Return: 0 if no error, else corresponding error value. | |
9efa93b0 | 503 | */ |
2f8ec2a9 EV |
504 | static int _ti_bandgap_write_threshold(struct ti_bandgap *bgp, int id, int val, |
505 | bool hot) | |
8feaf0ce | 506 | { |
56f132f7 EV |
507 | struct temp_sensor_data *ts_data; |
508 | struct temp_sensor_registers *tsr; | |
509 | u32 adc_val; | |
510 | int ret; | |
511 | ||
03e859d3 | 512 | ret = ti_bandgap_validate(bgp, id); |
56f132f7 EV |
513 | if (ret) |
514 | goto exit; | |
515 | ||
03e859d3 | 516 | if (!TI_BANDGAP_HAS(bgp, TALERT)) { |
56f132f7 EV |
517 | ret = -ENOTSUPP; |
518 | goto exit; | |
8feaf0ce EV |
519 | } |
520 | ||
d7f080e6 EV |
521 | ts_data = bgp->conf->sensors[id].ts_data; |
522 | tsr = bgp->conf->sensors[id].registers; | |
56f132f7 EV |
523 | if (hot) { |
524 | if (val < ts_data->min_temp + ts_data->hyst_val) | |
525 | ret = -EINVAL; | |
526 | } else { | |
527 | if (val > ts_data->max_temp + ts_data->hyst_val) | |
528 | ret = -EINVAL; | |
8feaf0ce EV |
529 | } |
530 | ||
56f132f7 EV |
531 | if (ret) |
532 | goto exit; | |
533 | ||
03e859d3 | 534 | ret = ti_bandgap_mcelsius_to_adc(bgp, val, &adc_val); |
56f132f7 EV |
535 | if (ret < 0) |
536 | goto exit; | |
537 | ||
d7f080e6 | 538 | spin_lock(&bgp->lock); |
d52361c6 | 539 | ret = ti_bandgap_update_alert_threshold(bgp, id, adc_val, hot); |
d7f080e6 | 540 | spin_unlock(&bgp->lock); |
56f132f7 EV |
541 | |
542 | exit: | |
543 | return ret; | |
8feaf0ce EV |
544 | } |
545 | ||
7a681a50 | 546 | /** |
03e859d3 EV |
547 | * _ti_bandgap_read_threshold() - helper to read TALERT t_cold or t_hot |
548 | * @bgp: struct ti_bandgap pointer | |
7a681a50 EV |
549 | * @id: bandgap sensor id |
550 | * @val: value (mCelsius) of a threshold | |
551 | * @hot: desired threshold to be read. true if threshold hot, false if | |
552 | * threshold cold | |
553 | * | |
554 | * It will fetch the required thresholds (hot and cold) for TALERT signal. | |
555 | * This function can be used to read t_hot or t_cold, depending on @hot value. | |
556 | * Call this function only if bandgap features HAS(TALERT). | |
169e8d03 NM |
557 | * |
558 | * Return: 0 if no error, -ENOTSUPP if it has no TALERT support, or the | |
559 | * corresponding error value if some operation fails. | |
7a681a50 | 560 | */ |
2f8ec2a9 EV |
561 | static int _ti_bandgap_read_threshold(struct ti_bandgap *bgp, int id, |
562 | int *val, bool hot) | |
8feaf0ce EV |
563 | { |
564 | struct temp_sensor_registers *tsr; | |
56f132f7 EV |
565 | u32 temp, mask; |
566 | int ret = 0; | |
8feaf0ce | 567 | |
03e859d3 | 568 | ret = ti_bandgap_validate(bgp, id); |
8feaf0ce | 569 | if (ret) |
56f132f7 | 570 | goto exit; |
8feaf0ce | 571 | |
03e859d3 | 572 | if (!TI_BANDGAP_HAS(bgp, TALERT)) { |
56f132f7 EV |
573 | ret = -ENOTSUPP; |
574 | goto exit; | |
575 | } | |
8feaf0ce | 576 | |
d7f080e6 | 577 | tsr = bgp->conf->sensors[id].registers; |
56f132f7 EV |
578 | if (hot) |
579 | mask = tsr->threshold_thot_mask; | |
580 | else | |
581 | mask = tsr->threshold_tcold_mask; | |
582 | ||
03e859d3 | 583 | temp = ti_bandgap_readl(bgp, tsr->bgap_threshold); |
56f132f7 | 584 | temp = (temp & mask) >> __ffs(mask); |
03e859d3 | 585 | ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp); |
8feaf0ce | 586 | if (ret) { |
d7f080e6 | 587 | dev_err(bgp->dev, "failed to read thot\n"); |
56f132f7 EV |
588 | ret = -EIO; |
589 | goto exit; | |
8feaf0ce EV |
590 | } |
591 | ||
56f132f7 | 592 | *val = temp; |
8feaf0ce | 593 | |
56f132f7 | 594 | exit: |
648b4c6c | 595 | return ret; |
8feaf0ce EV |
596 | } |
597 | ||
56f132f7 EV |
598 | /*** Exposed APIs ***/ |
599 | ||
600 | /** | |
03e859d3 | 601 | * ti_bandgap_read_thot() - reads sensor current thot |
61603af3 EV |
602 | * @bgp: pointer to bandgap instance |
603 | * @id: sensor id | |
604 | * @thot: resulting current thot value | |
56f132f7 | 605 | * |
169e8d03 | 606 | * Return: 0 on success or the proper error code |
56f132f7 | 607 | */ |
03e859d3 | 608 | int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot) |
56f132f7 | 609 | { |
03e859d3 | 610 | return _ti_bandgap_read_threshold(bgp, id, thot, true); |
56f132f7 EV |
611 | } |
612 | ||
8feaf0ce | 613 | /** |
03e859d3 | 614 | * ti_bandgap_write_thot() - sets sensor current thot |
61603af3 EV |
615 | * @bgp: pointer to bandgap instance |
616 | * @id: sensor id | |
617 | * @val: desired thot value | |
8feaf0ce | 618 | * |
169e8d03 | 619 | * Return: 0 on success or the proper error code |
8feaf0ce | 620 | */ |
03e859d3 | 621 | int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val) |
8feaf0ce | 622 | { |
03e859d3 | 623 | return _ti_bandgap_write_threshold(bgp, id, val, true); |
8feaf0ce EV |
624 | } |
625 | ||
626 | /** | |
03e859d3 | 627 | * ti_bandgap_read_tcold() - reads sensor current tcold |
61603af3 EV |
628 | * @bgp: pointer to bandgap instance |
629 | * @id: sensor id | |
630 | * @tcold: resulting current tcold value | |
8feaf0ce | 631 | * |
169e8d03 | 632 | * Return: 0 on success or the proper error code |
8feaf0ce | 633 | */ |
03e859d3 | 634 | int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold) |
8feaf0ce | 635 | { |
03e859d3 | 636 | return _ti_bandgap_read_threshold(bgp, id, tcold, false); |
8feaf0ce EV |
637 | } |
638 | ||
639 | /** | |
03e859d3 | 640 | * ti_bandgap_write_tcold() - sets the sensor tcold |
61603af3 EV |
641 | * @bgp: pointer to bandgap instance |
642 | * @id: sensor id | |
643 | * @val: desired tcold value | |
8feaf0ce | 644 | * |
169e8d03 | 645 | * Return: 0 on success or the proper error code |
8feaf0ce | 646 | */ |
03e859d3 | 647 | int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val) |
8feaf0ce | 648 | { |
03e859d3 | 649 | return _ti_bandgap_write_threshold(bgp, id, val, false); |
8feaf0ce EV |
650 | } |
651 | ||
58bccd07 K |
652 | /** |
653 | * ti_bandgap_read_counter() - read the sensor counter | |
654 | * @bgp: pointer to bandgap instance | |
655 | * @id: sensor id | |
656 | * @interval: resulting update interval in miliseconds | |
657 | */ | |
658 | static void ti_bandgap_read_counter(struct ti_bandgap *bgp, int id, | |
659 | int *interval) | |
660 | { | |
661 | struct temp_sensor_registers *tsr; | |
662 | int time; | |
663 | ||
664 | tsr = bgp->conf->sensors[id].registers; | |
665 | time = ti_bandgap_readl(bgp, tsr->bgap_counter); | |
666 | time = (time & tsr->counter_mask) >> | |
667 | __ffs(tsr->counter_mask); | |
668 | time = time * 1000 / bgp->clk_rate; | |
669 | *interval = time; | |
670 | } | |
671 | ||
672 | /** | |
673 | * ti_bandgap_read_counter_delay() - read the sensor counter delay | |
674 | * @bgp: pointer to bandgap instance | |
675 | * @id: sensor id | |
676 | * @interval: resulting update interval in miliseconds | |
677 | */ | |
678 | static void ti_bandgap_read_counter_delay(struct ti_bandgap *bgp, int id, | |
679 | int *interval) | |
680 | { | |
681 | struct temp_sensor_registers *tsr; | |
682 | int reg_val; | |
683 | ||
684 | tsr = bgp->conf->sensors[id].registers; | |
685 | ||
686 | reg_val = ti_bandgap_readl(bgp, tsr->bgap_mask_ctrl); | |
687 | reg_val = (reg_val & tsr->mask_counter_delay_mask) >> | |
688 | __ffs(tsr->mask_counter_delay_mask); | |
689 | switch (reg_val) { | |
690 | case 0: | |
691 | *interval = 0; | |
692 | break; | |
693 | case 1: | |
694 | *interval = 1; | |
695 | break; | |
696 | case 2: | |
697 | *interval = 10; | |
698 | break; | |
699 | case 3: | |
700 | *interval = 100; | |
701 | break; | |
702 | case 4: | |
703 | *interval = 250; | |
704 | break; | |
705 | case 5: | |
706 | *interval = 500; | |
707 | break; | |
708 | default: | |
709 | dev_warn(bgp->dev, "Wrong counter delay value read from register %X", | |
710 | reg_val); | |
711 | } | |
712 | } | |
713 | ||
8feaf0ce | 714 | /** |
03e859d3 | 715 | * ti_bandgap_read_update_interval() - read the sensor update interval |
61603af3 EV |
716 | * @bgp: pointer to bandgap instance |
717 | * @id: sensor id | |
718 | * @interval: resulting update interval in miliseconds | |
8feaf0ce | 719 | * |
169e8d03 | 720 | * Return: 0 on success or the proper error code |
8feaf0ce | 721 | */ |
03e859d3 EV |
722 | int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id, |
723 | int *interval) | |
8feaf0ce | 724 | { |
58bccd07 | 725 | int ret = 0; |
8feaf0ce | 726 | |
03e859d3 | 727 | ret = ti_bandgap_validate(bgp, id); |
8feaf0ce | 728 | if (ret) |
58bccd07 | 729 | goto exit; |
8feaf0ce | 730 | |
58bccd07 K |
731 | if (!TI_BANDGAP_HAS(bgp, COUNTER) && |
732 | !TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) { | |
733 | ret = -ENOTSUPP; | |
734 | goto exit; | |
735 | } | |
8feaf0ce | 736 | |
58bccd07 K |
737 | if (TI_BANDGAP_HAS(bgp, COUNTER)) { |
738 | ti_bandgap_read_counter(bgp, id, interval); | |
739 | goto exit; | |
740 | } | |
8feaf0ce | 741 | |
58bccd07 K |
742 | ti_bandgap_read_counter_delay(bgp, id, interval); |
743 | exit: | |
744 | return ret; | |
745 | } | |
746 | ||
747 | /** | |
748 | * ti_bandgap_write_counter_delay() - set the counter_delay | |
749 | * @bgp: pointer to bandgap instance | |
750 | * @id: sensor id | |
751 | * @interval: desired update interval in miliseconds | |
752 | * | |
753 | * Return: 0 on success or the proper error code | |
754 | */ | |
755 | static int ti_bandgap_write_counter_delay(struct ti_bandgap *bgp, int id, | |
756 | u32 interval) | |
757 | { | |
758 | int rval; | |
759 | ||
760 | switch (interval) { | |
761 | case 0: /* Immediate conversion */ | |
762 | rval = 0x0; | |
763 | break; | |
764 | case 1: /* Conversion after ever 1ms */ | |
765 | rval = 0x1; | |
766 | break; | |
767 | case 10: /* Conversion after ever 10ms */ | |
768 | rval = 0x2; | |
769 | break; | |
770 | case 100: /* Conversion after ever 100ms */ | |
771 | rval = 0x3; | |
772 | break; | |
773 | case 250: /* Conversion after ever 250ms */ | |
774 | rval = 0x4; | |
775 | break; | |
776 | case 500: /* Conversion after ever 500ms */ | |
777 | rval = 0x5; | |
778 | break; | |
779 | default: | |
780 | dev_warn(bgp->dev, "Delay %d ms is not supported\n", interval); | |
781 | return -EINVAL; | |
782 | } | |
783 | ||
784 | spin_lock(&bgp->lock); | |
785 | RMW_BITS(bgp, id, bgap_mask_ctrl, mask_counter_delay_mask, rval); | |
786 | spin_unlock(&bgp->lock); | |
8feaf0ce EV |
787 | |
788 | return 0; | |
789 | } | |
790 | ||
58bccd07 K |
791 | /** |
792 | * ti_bandgap_write_counter() - set the bandgap sensor counter | |
793 | * @bgp: pointer to bandgap instance | |
794 | * @id: sensor id | |
795 | * @interval: desired update interval in miliseconds | |
796 | */ | |
797 | static void ti_bandgap_write_counter(struct ti_bandgap *bgp, int id, | |
798 | u32 interval) | |
799 | { | |
800 | interval = interval * bgp->clk_rate / 1000; | |
801 | spin_lock(&bgp->lock); | |
802 | RMW_BITS(bgp, id, bgap_counter, counter_mask, interval); | |
803 | spin_unlock(&bgp->lock); | |
804 | } | |
805 | ||
8feaf0ce | 806 | /** |
03e859d3 | 807 | * ti_bandgap_write_update_interval() - set the update interval |
61603af3 EV |
808 | * @bgp: pointer to bandgap instance |
809 | * @id: sensor id | |
810 | * @interval: desired update interval in miliseconds | |
8feaf0ce | 811 | * |
169e8d03 | 812 | * Return: 0 on success or the proper error code |
8feaf0ce | 813 | */ |
03e859d3 EV |
814 | int ti_bandgap_write_update_interval(struct ti_bandgap *bgp, |
815 | int id, u32 interval) | |
8feaf0ce | 816 | { |
03e859d3 | 817 | int ret = ti_bandgap_validate(bgp, id); |
8feaf0ce | 818 | if (ret) |
58bccd07 | 819 | goto exit; |
8feaf0ce | 820 | |
58bccd07 K |
821 | if (!TI_BANDGAP_HAS(bgp, COUNTER) && |
822 | !TI_BANDGAP_HAS(bgp, COUNTER_DELAY)) { | |
823 | ret = -ENOTSUPP; | |
824 | goto exit; | |
825 | } | |
8feaf0ce | 826 | |
58bccd07 K |
827 | if (TI_BANDGAP_HAS(bgp, COUNTER)) { |
828 | ti_bandgap_write_counter(bgp, id, interval); | |
829 | goto exit; | |
830 | } | |
8feaf0ce | 831 | |
58bccd07 K |
832 | ret = ti_bandgap_write_counter_delay(bgp, id, interval); |
833 | exit: | |
834 | return ret; | |
8feaf0ce EV |
835 | } |
836 | ||
837 | /** | |
03e859d3 | 838 | * ti_bandgap_read_temperature() - report current temperature |
61603af3 EV |
839 | * @bgp: pointer to bandgap instance |
840 | * @id: sensor id | |
841 | * @temperature: resulting temperature | |
8feaf0ce | 842 | * |
169e8d03 | 843 | * Return: 0 on success or the proper error code |
8feaf0ce | 844 | */ |
03e859d3 EV |
845 | int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id, |
846 | int *temperature) | |
8feaf0ce | 847 | { |
8feaf0ce EV |
848 | u32 temp; |
849 | int ret; | |
850 | ||
03e859d3 | 851 | ret = ti_bandgap_validate(bgp, id); |
8feaf0ce EV |
852 | if (ret) |
853 | return ret; | |
854 | ||
d7f080e6 | 855 | spin_lock(&bgp->lock); |
03e859d3 | 856 | temp = ti_bandgap_read_temp(bgp, id); |
d7f080e6 | 857 | spin_unlock(&bgp->lock); |
8feaf0ce | 858 | |
03e859d3 | 859 | ret |= ti_bandgap_adc_to_mcelsius(bgp, temp, &temp); |
8feaf0ce EV |
860 | if (ret) |
861 | return -EIO; | |
862 | ||
863 | *temperature = temp; | |
864 | ||
865 | return 0; | |
866 | } | |
867 | ||
868 | /** | |
03e859d3 | 869 | * ti_bandgap_set_sensor_data() - helper function to store thermal |
8feaf0ce | 870 | * framework related data. |
61603af3 EV |
871 | * @bgp: pointer to bandgap instance |
872 | * @id: sensor id | |
873 | * @data: thermal framework related data to be stored | |
8feaf0ce | 874 | * |
169e8d03 | 875 | * Return: 0 on success or the proper error code |
8feaf0ce | 876 | */ |
03e859d3 | 877 | int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data) |
8feaf0ce | 878 | { |
03e859d3 | 879 | int ret = ti_bandgap_validate(bgp, id); |
8feaf0ce EV |
880 | if (ret) |
881 | return ret; | |
882 | ||
9879b2c4 | 883 | bgp->regval[id].data = data; |
8feaf0ce EV |
884 | |
885 | return 0; | |
886 | } | |
887 | ||
888 | /** | |
03e859d3 | 889 | * ti_bandgap_get_sensor_data() - helper function to get thermal |
8feaf0ce | 890 | * framework related data. |
61603af3 EV |
891 | * @bgp: pointer to bandgap instance |
892 | * @id: sensor id | |
8feaf0ce | 893 | * |
169e8d03 | 894 | * Return: data stored by set function with sensor id on success or NULL |
8feaf0ce | 895 | */ |
03e859d3 | 896 | void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id) |
8feaf0ce | 897 | { |
03e859d3 | 898 | int ret = ti_bandgap_validate(bgp, id); |
8feaf0ce EV |
899 | if (ret) |
900 | return ERR_PTR(ret); | |
901 | ||
9879b2c4 | 902 | return bgp->regval[id].data; |
8feaf0ce EV |
903 | } |
904 | ||
e195aba4 EV |
905 | /*** Helper functions used during device initialization ***/ |
906 | ||
31102a72 | 907 | /** |
03e859d3 EV |
908 | * ti_bandgap_force_single_read() - executes 1 single ADC conversion |
909 | * @bgp: pointer to struct ti_bandgap | |
31102a72 EV |
910 | * @id: sensor id which it is desired to read 1 temperature |
911 | * | |
912 | * Used to initialize the conversion state machine and set it to a valid | |
913 | * state. Called during device initialization and context restore events. | |
169e8d03 NM |
914 | * |
915 | * Return: 0 | |
31102a72 | 916 | */ |
8feaf0ce | 917 | static int |
03e859d3 | 918 | ti_bandgap_force_single_read(struct ti_bandgap *bgp, int id) |
8feaf0ce | 919 | { |
8feaf0ce EV |
920 | u32 temp = 0, counter = 1000; |
921 | ||
8feaf0ce | 922 | /* Select single conversion mode */ |
03e859d3 | 923 | if (TI_BANDGAP_HAS(bgp, MODE_CONFIG)) |
d7f080e6 | 924 | RMW_BITS(bgp, id, bgap_mode_ctrl, mode_ctrl_mask, 0); |
8feaf0ce EV |
925 | |
926 | /* Start of Conversion = 1 */ | |
d7f080e6 | 927 | RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 1); |
8feaf0ce | 928 | /* Wait until DTEMP is updated */ |
03e859d3 | 929 | temp = ti_bandgap_read_temp(bgp, id); |
194a54f0 EV |
930 | |
931 | while ((temp == 0) && --counter) | |
03e859d3 | 932 | temp = ti_bandgap_read_temp(bgp, id); |
d3c291ab | 933 | /* REVISIT: Check correct condition for end of conversion */ |
194a54f0 | 934 | |
8feaf0ce | 935 | /* Start of Conversion = 0 */ |
d7f080e6 | 936 | RMW_BITS(bgp, id, temp_sensor_ctrl, bgap_soc_mask, 0); |
8feaf0ce EV |
937 | |
938 | return 0; | |
939 | } | |
940 | ||
941 | /** | |
03e859d3 EV |
942 | * ti_bandgap_set_continous_mode() - One time enabling of continuous mode |
943 | * @bgp: pointer to struct ti_bandgap | |
8feaf0ce | 944 | * |
a84b6f45 EV |
945 | * Call this function only if HAS(MODE_CONFIG) is set. As this driver may |
946 | * be used for junction temperature monitoring, it is desirable that the | |
947 | * sensors are operational all the time, so that alerts are generated | |
948 | * properly. | |
169e8d03 NM |
949 | * |
950 | * Return: 0 | |
8feaf0ce | 951 | */ |
03e859d3 | 952 | static int ti_bandgap_set_continuous_mode(struct ti_bandgap *bgp) |
8feaf0ce | 953 | { |
8feaf0ce | 954 | int i; |
8feaf0ce | 955 | |
d7f080e6 | 956 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce | 957 | /* Perform a single read just before enabling continuous */ |
03e859d3 | 958 | ti_bandgap_force_single_read(bgp, i); |
d7f080e6 | 959 | RMW_BITS(bgp, i, bgap_mode_ctrl, mode_ctrl_mask, 1); |
8feaf0ce EV |
960 | } |
961 | ||
962 | return 0; | |
963 | } | |
964 | ||
2f440b06 K |
965 | /** |
966 | * ti_bandgap_get_trend() - To fetch the temperature trend of a sensor | |
967 | * @bgp: pointer to struct ti_bandgap | |
968 | * @id: id of the individual sensor | |
969 | * @trend: Pointer to trend. | |
970 | * | |
971 | * This function needs to be called to fetch the temperature trend of a | |
972 | * Particular sensor. The function computes the difference in temperature | |
973 | * w.r.t time. For the bandgaps with built in history buffer the temperatures | |
974 | * are read from the buffer and for those without the Buffer -ENOTSUPP is | |
975 | * returned. | |
976 | * | |
977 | * Return: 0 if no error, else return corresponding error. If no | |
978 | * error then the trend value is passed on to trend parameter | |
979 | */ | |
980 | int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend) | |
981 | { | |
982 | struct temp_sensor_registers *tsr; | |
983 | u32 temp1, temp2, reg1, reg2; | |
984 | int t1, t2, interval, ret = 0; | |
985 | ||
986 | ret = ti_bandgap_validate(bgp, id); | |
987 | if (ret) | |
988 | goto exit; | |
989 | ||
990 | if (!TI_BANDGAP_HAS(bgp, HISTORY_BUFFER) || | |
991 | !TI_BANDGAP_HAS(bgp, FREEZE_BIT)) { | |
992 | ret = -ENOTSUPP; | |
993 | goto exit; | |
994 | } | |
995 | ||
ba0049ea EV |
996 | spin_lock(&bgp->lock); |
997 | ||
2f440b06 K |
998 | tsr = bgp->conf->sensors[id].registers; |
999 | ||
1000 | /* Freeze and read the last 2 valid readings */ | |
ba0049ea | 1001 | RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 1); |
2f440b06 K |
1002 | reg1 = tsr->ctrl_dtemp_1; |
1003 | reg2 = tsr->ctrl_dtemp_2; | |
1004 | ||
1005 | /* read temperature from history buffer */ | |
1006 | temp1 = ti_bandgap_readl(bgp, reg1); | |
1007 | temp1 &= tsr->bgap_dtemp_mask; | |
1008 | ||
1009 | temp2 = ti_bandgap_readl(bgp, reg2); | |
1010 | temp2 &= tsr->bgap_dtemp_mask; | |
1011 | ||
1012 | /* Convert from adc values to mCelsius temperature */ | |
1013 | ret = ti_bandgap_adc_to_mcelsius(bgp, temp1, &t1); | |
1014 | if (ret) | |
ba0049ea | 1015 | goto unfreeze; |
2f440b06 K |
1016 | |
1017 | ret = ti_bandgap_adc_to_mcelsius(bgp, temp2, &t2); | |
1018 | if (ret) | |
ba0049ea | 1019 | goto unfreeze; |
2f440b06 K |
1020 | |
1021 | /* Fetch the update interval */ | |
1022 | ret = ti_bandgap_read_update_interval(bgp, id, &interval); | |
e838ff81 | 1023 | if (ret) |
ba0049ea | 1024 | goto unfreeze; |
2f440b06 | 1025 | |
e838ff81 RK |
1026 | /* Set the interval to 1 ms if bandgap counter delay is not set */ |
1027 | if (interval == 0) | |
1028 | interval = 1; | |
1029 | ||
2f440b06 K |
1030 | *trend = (t1 - t2) / interval; |
1031 | ||
1032 | dev_dbg(bgp->dev, "The temperatures are t1 = %d and t2 = %d and trend =%d\n", | |
1033 | t1, t2, *trend); | |
1034 | ||
ba0049ea EV |
1035 | unfreeze: |
1036 | RMW_BITS(bgp, id, bgap_mask_ctrl, mask_freeze_mask, 0); | |
1037 | spin_unlock(&bgp->lock); | |
2f440b06 K |
1038 | exit: |
1039 | return ret; | |
1040 | } | |
1041 | ||
d3790b3d | 1042 | /** |
03e859d3 EV |
1043 | * ti_bandgap_tshut_init() - setup and initialize tshut handling |
1044 | * @bgp: pointer to struct ti_bandgap | |
d3790b3d EV |
1045 | * @pdev: pointer to device struct platform_device |
1046 | * | |
1047 | * Call this function only in case the bandgap features HAS(TSHUT). | |
1048 | * In this case, the driver needs to handle the TSHUT signal as an IRQ. | |
1049 | * The IRQ is wired as a GPIO, and for this purpose, it is required | |
1050 | * to specify which GPIO line is used. TSHUT IRQ is fired anytime | |
1051 | * one of the bandgap sensors violates the TSHUT high/hot threshold. | |
1052 | * And in that case, the system must go off. | |
169e8d03 NM |
1053 | * |
1054 | * Return: 0 if no error, else error status | |
d3790b3d | 1055 | */ |
03e859d3 EV |
1056 | static int ti_bandgap_tshut_init(struct ti_bandgap *bgp, |
1057 | struct platform_device *pdev) | |
8feaf0ce | 1058 | { |
d7f080e6 | 1059 | int gpio_nr = bgp->tshut_gpio; |
8feaf0ce EV |
1060 | int status; |
1061 | ||
1062 | /* Request for gpio_86 line */ | |
1063 | status = gpio_request(gpio_nr, "tshut"); | |
1064 | if (status < 0) { | |
d7f080e6 | 1065 | dev_err(bgp->dev, "Could not request for TSHUT GPIO:%i\n", 86); |
8feaf0ce EV |
1066 | return status; |
1067 | } | |
1068 | status = gpio_direction_input(gpio_nr); | |
1069 | if (status) { | |
d7f080e6 | 1070 | dev_err(bgp->dev, "Cannot set input TSHUT GPIO %d\n", gpio_nr); |
8feaf0ce EV |
1071 | return status; |
1072 | } | |
1073 | ||
03e859d3 EV |
1074 | status = request_irq(gpio_to_irq(gpio_nr), ti_bandgap_tshut_irq_handler, |
1075 | IRQF_TRIGGER_RISING, "tshut", NULL); | |
8feaf0ce EV |
1076 | if (status) { |
1077 | gpio_free(gpio_nr); | |
d7f080e6 | 1078 | dev_err(bgp->dev, "request irq failed for TSHUT"); |
8feaf0ce EV |
1079 | } |
1080 | ||
1081 | return 0; | |
1082 | } | |
1083 | ||
094b8aca | 1084 | /** |
03e859d3 EV |
1085 | * ti_bandgap_alert_init() - setup and initialize talert handling |
1086 | * @bgp: pointer to struct ti_bandgap | |
094b8aca EV |
1087 | * @pdev: pointer to device struct platform_device |
1088 | * | |
1089 | * Call this function only in case the bandgap features HAS(TALERT). | |
1090 | * In this case, the driver needs to handle the TALERT signals as an IRQs. | |
1091 | * TALERT is a normal IRQ and it is fired any time thresholds (hot or cold) | |
1092 | * are violated. In these situation, the driver must reprogram the thresholds, | |
1093 | * accordingly to specified policy. | |
169e8d03 NM |
1094 | * |
1095 | * Return: 0 if no error, else return corresponding error. | |
094b8aca | 1096 | */ |
03e859d3 EV |
1097 | static int ti_bandgap_talert_init(struct ti_bandgap *bgp, |
1098 | struct platform_device *pdev) | |
8feaf0ce EV |
1099 | { |
1100 | int ret; | |
1101 | ||
d7f080e6 EV |
1102 | bgp->irq = platform_get_irq(pdev, 0); |
1103 | if (bgp->irq < 0) { | |
8feaf0ce | 1104 | dev_err(&pdev->dev, "get_irq failed\n"); |
d7f080e6 | 1105 | return bgp->irq; |
8feaf0ce | 1106 | } |
d7f080e6 | 1107 | ret = request_threaded_irq(bgp->irq, NULL, |
03e859d3 | 1108 | ti_bandgap_talert_irq_handler, |
8feaf0ce | 1109 | IRQF_TRIGGER_HIGH | IRQF_ONESHOT, |
d7f080e6 | 1110 | "talert", bgp); |
8feaf0ce EV |
1111 | if (ret) { |
1112 | dev_err(&pdev->dev, "Request threaded irq failed.\n"); | |
1113 | return ret; | |
1114 | } | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
61603af3 | 1119 | static const struct of_device_id of_ti_bandgap_match[]; |
e9b6f8c4 | 1120 | /** |
03e859d3 | 1121 | * ti_bandgap_build() - parse DT and setup a struct ti_bandgap |
e9b6f8c4 EV |
1122 | * @pdev: pointer to device struct platform_device |
1123 | * | |
1124 | * Used to read the device tree properties accordingly to the bandgap | |
1125 | * matching version. Based on bandgap version and its capabilities it | |
03e859d3 | 1126 | * will build a struct ti_bandgap out of the required DT entries. |
169e8d03 NM |
1127 | * |
1128 | * Return: valid bandgap structure if successful, else returns ERR_PTR | |
1129 | * return value must be verified with IS_ERR. | |
e9b6f8c4 | 1130 | */ |
03e859d3 | 1131 | static struct ti_bandgap *ti_bandgap_build(struct platform_device *pdev) |
8feaf0ce EV |
1132 | { |
1133 | struct device_node *node = pdev->dev.of_node; | |
1134 | const struct of_device_id *of_id; | |
03e859d3 | 1135 | struct ti_bandgap *bgp; |
8feaf0ce | 1136 | struct resource *res; |
8feaf0ce EV |
1137 | int i; |
1138 | ||
1139 | /* just for the sake */ | |
1140 | if (!node) { | |
1141 | dev_err(&pdev->dev, "no platform information available\n"); | |
1142 | return ERR_PTR(-EINVAL); | |
1143 | } | |
1144 | ||
f6843569 | 1145 | bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL); |
d7f080e6 | 1146 | if (!bgp) { |
8feaf0ce EV |
1147 | dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n"); |
1148 | return ERR_PTR(-ENOMEM); | |
1149 | } | |
1150 | ||
03e859d3 | 1151 | of_id = of_match_device(of_ti_bandgap_match, &pdev->dev); |
8feaf0ce | 1152 | if (of_id) |
d7f080e6 | 1153 | bgp->conf = of_id->data; |
8feaf0ce | 1154 | |
9879b2c4 EV |
1155 | /* register shadow for context save and restore */ |
1156 | bgp->regval = devm_kzalloc(&pdev->dev, sizeof(*bgp->regval) * | |
1157 | bgp->conf->sensor_count, GFP_KERNEL); | |
fbe2ddcd | 1158 | if (!bgp->regval) { |
9879b2c4 EV |
1159 | dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n"); |
1160 | return ERR_PTR(-ENOMEM); | |
1161 | } | |
1162 | ||
8feaf0ce EV |
1163 | i = 0; |
1164 | do { | |
1165 | void __iomem *chunk; | |
1166 | ||
1167 | res = platform_get_resource(pdev, IORESOURCE_MEM, i); | |
1168 | if (!res) | |
1169 | break; | |
97f4be60 | 1170 | chunk = devm_ioremap_resource(&pdev->dev, res); |
8feaf0ce | 1171 | if (i == 0) |
d7f080e6 | 1172 | bgp->base = chunk; |
97f4be60 TR |
1173 | if (IS_ERR(chunk)) |
1174 | return ERR_CAST(chunk); | |
24796e12 | 1175 | |
8feaf0ce EV |
1176 | i++; |
1177 | } while (res); | |
1178 | ||
03e859d3 | 1179 | if (TI_BANDGAP_HAS(bgp, TSHUT)) { |
57d16171 | 1180 | bgp->tshut_gpio = of_get_gpio(node, 0); |
d7f080e6 | 1181 | if (!gpio_is_valid(bgp->tshut_gpio)) { |
8feaf0ce | 1182 | dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n", |
d7f080e6 | 1183 | bgp->tshut_gpio); |
8feaf0ce EV |
1184 | return ERR_PTR(-EINVAL); |
1185 | } | |
1186 | } | |
1187 | ||
d7f080e6 | 1188 | return bgp; |
8feaf0ce EV |
1189 | } |
1190 | ||
f91ddfed EV |
1191 | /*** Device driver call backs ***/ |
1192 | ||
8feaf0ce | 1193 | static |
03e859d3 | 1194 | int ti_bandgap_probe(struct platform_device *pdev) |
8feaf0ce | 1195 | { |
03e859d3 | 1196 | struct ti_bandgap *bgp; |
8feaf0ce EV |
1197 | int clk_rate, ret = 0, i; |
1198 | ||
03e859d3 | 1199 | bgp = ti_bandgap_build(pdev); |
0c12b5ac | 1200 | if (IS_ERR(bgp)) { |
8feaf0ce | 1201 | dev_err(&pdev->dev, "failed to fetch platform data\n"); |
d7f080e6 | 1202 | return PTR_ERR(bgp); |
8feaf0ce | 1203 | } |
d7f080e6 | 1204 | bgp->dev = &pdev->dev; |
8feaf0ce | 1205 | |
03e859d3 EV |
1206 | if (TI_BANDGAP_HAS(bgp, TSHUT)) { |
1207 | ret = ti_bandgap_tshut_init(bgp, pdev); | |
8feaf0ce EV |
1208 | if (ret) { |
1209 | dev_err(&pdev->dev, | |
1210 | "failed to initialize system tshut IRQ\n"); | |
1211 | return ret; | |
1212 | } | |
1213 | } | |
1214 | ||
d7f080e6 | 1215 | bgp->fclock = clk_get(NULL, bgp->conf->fclock_name); |
0c12b5ac | 1216 | ret = IS_ERR(bgp->fclock); |
8feaf0ce EV |
1217 | if (ret) { |
1218 | dev_err(&pdev->dev, "failed to request fclock reference\n"); | |
0c12b5ac | 1219 | ret = PTR_ERR(bgp->fclock); |
8feaf0ce EV |
1220 | goto free_irqs; |
1221 | } | |
1222 | ||
d7f080e6 | 1223 | bgp->div_clk = clk_get(NULL, bgp->conf->div_ck_name); |
0c12b5ac | 1224 | ret = IS_ERR(bgp->div_clk); |
8feaf0ce EV |
1225 | if (ret) { |
1226 | dev_err(&pdev->dev, | |
1227 | "failed to request div_ts_ck clock ref\n"); | |
0c12b5ac | 1228 | ret = PTR_ERR(bgp->div_clk); |
8feaf0ce EV |
1229 | goto free_irqs; |
1230 | } | |
1231 | ||
d7f080e6 | 1232 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce EV |
1233 | struct temp_sensor_registers *tsr; |
1234 | u32 val; | |
1235 | ||
d7f080e6 | 1236 | tsr = bgp->conf->sensors[i].registers; |
8feaf0ce EV |
1237 | /* |
1238 | * check if the efuse has a non-zero value if not | |
1239 | * it is an untrimmed sample and the temperatures | |
1240 | * may not be accurate | |
1241 | */ | |
03e859d3 | 1242 | val = ti_bandgap_readl(bgp, tsr->bgap_efuse); |
8feaf0ce EV |
1243 | if (ret || !val) |
1244 | dev_info(&pdev->dev, | |
1245 | "Non-trimmed BGAP, Temp not accurate\n"); | |
1246 | } | |
1247 | ||
d7f080e6 EV |
1248 | clk_rate = clk_round_rate(bgp->div_clk, |
1249 | bgp->conf->sensors[0].ts_data->max_freq); | |
1250 | if (clk_rate < bgp->conf->sensors[0].ts_data->min_freq || | |
c68789e5 | 1251 | clk_rate <= 0) { |
8feaf0ce EV |
1252 | ret = -ENODEV; |
1253 | dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate); | |
1254 | goto put_clks; | |
1255 | } | |
1256 | ||
d7f080e6 | 1257 | ret = clk_set_rate(bgp->div_clk, clk_rate); |
8feaf0ce EV |
1258 | if (ret) |
1259 | dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n"); | |
1260 | ||
d7f080e6 | 1261 | bgp->clk_rate = clk_rate; |
03e859d3 | 1262 | if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
d7f080e6 | 1263 | clk_prepare_enable(bgp->fclock); |
6c9c1d66 | 1264 | |
8feaf0ce | 1265 | |
d7f080e6 EV |
1266 | spin_lock_init(&bgp->lock); |
1267 | bgp->dev = &pdev->dev; | |
1268 | platform_set_drvdata(pdev, bgp); | |
8feaf0ce | 1269 | |
03e859d3 | 1270 | ti_bandgap_power(bgp, true); |
8feaf0ce EV |
1271 | |
1272 | /* Set default counter to 1 for now */ | |
03e859d3 | 1273 | if (TI_BANDGAP_HAS(bgp, COUNTER)) |
d7f080e6 EV |
1274 | for (i = 0; i < bgp->conf->sensor_count; i++) |
1275 | RMW_BITS(bgp, i, bgap_counter, counter_mask, 1); | |
8feaf0ce | 1276 | |
d3c291ab | 1277 | /* Set default thresholds for alert and shutdown */ |
d7f080e6 | 1278 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce EV |
1279 | struct temp_sensor_data *ts_data; |
1280 | ||
d7f080e6 | 1281 | ts_data = bgp->conf->sensors[i].ts_data; |
8feaf0ce | 1282 | |
03e859d3 | 1283 | if (TI_BANDGAP_HAS(bgp, TALERT)) { |
d3c291ab | 1284 | /* Set initial Talert thresholds */ |
d7f080e6 | 1285 | RMW_BITS(bgp, i, bgap_threshold, |
d3c291ab | 1286 | threshold_tcold_mask, ts_data->t_cold); |
d7f080e6 | 1287 | RMW_BITS(bgp, i, bgap_threshold, |
d3c291ab EV |
1288 | threshold_thot_mask, ts_data->t_hot); |
1289 | /* Enable the alert events */ | |
d7f080e6 EV |
1290 | RMW_BITS(bgp, i, bgap_mask_ctrl, mask_hot_mask, 1); |
1291 | RMW_BITS(bgp, i, bgap_mask_ctrl, mask_cold_mask, 1); | |
d3c291ab EV |
1292 | } |
1293 | ||
03e859d3 | 1294 | if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) { |
d3c291ab | 1295 | /* Set initial Tshut thresholds */ |
d7f080e6 | 1296 | RMW_BITS(bgp, i, tshut_threshold, |
d3c291ab | 1297 | tshut_hot_mask, ts_data->tshut_hot); |
d7f080e6 | 1298 | RMW_BITS(bgp, i, tshut_threshold, |
d3c291ab | 1299 | tshut_cold_mask, ts_data->tshut_cold); |
8feaf0ce EV |
1300 | } |
1301 | } | |
1302 | ||
03e859d3 EV |
1303 | if (TI_BANDGAP_HAS(bgp, MODE_CONFIG)) |
1304 | ti_bandgap_set_continuous_mode(bgp); | |
8feaf0ce EV |
1305 | |
1306 | /* Set .250 seconds time as default counter */ | |
03e859d3 | 1307 | if (TI_BANDGAP_HAS(bgp, COUNTER)) |
d7f080e6 EV |
1308 | for (i = 0; i < bgp->conf->sensor_count; i++) |
1309 | RMW_BITS(bgp, i, bgap_counter, counter_mask, | |
1310 | bgp->clk_rate / 4); | |
8feaf0ce EV |
1311 | |
1312 | /* Every thing is good? Then expose the sensors */ | |
d7f080e6 | 1313 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce EV |
1314 | char *domain; |
1315 | ||
f1553334 EV |
1316 | if (bgp->conf->sensors[i].register_cooling) { |
1317 | ret = bgp->conf->sensors[i].register_cooling(bgp, i); | |
1318 | if (ret) | |
1319 | goto remove_sensors; | |
1320 | } | |
04a4d10d | 1321 | |
f1553334 EV |
1322 | if (bgp->conf->expose_sensor) { |
1323 | domain = bgp->conf->sensors[i].domain; | |
1324 | ret = bgp->conf->expose_sensor(bgp, i, domain); | |
1325 | if (ret) | |
1326 | goto remove_last_cooling; | |
1327 | } | |
8feaf0ce EV |
1328 | } |
1329 | ||
1330 | /* | |
1331 | * Enable the Interrupts once everything is set. Otherwise irq handler | |
1332 | * might be called as soon as it is enabled where as rest of framework | |
1333 | * is still getting initialised. | |
1334 | */ | |
03e859d3 EV |
1335 | if (TI_BANDGAP_HAS(bgp, TALERT)) { |
1336 | ret = ti_bandgap_talert_init(bgp, pdev); | |
8feaf0ce EV |
1337 | if (ret) { |
1338 | dev_err(&pdev->dev, "failed to initialize Talert IRQ\n"); | |
d7f080e6 | 1339 | i = bgp->conf->sensor_count; |
8feaf0ce EV |
1340 | goto disable_clk; |
1341 | } | |
1342 | } | |
1343 | ||
1344 | return 0; | |
1345 | ||
f1553334 EV |
1346 | remove_last_cooling: |
1347 | if (bgp->conf->sensors[i].unregister_cooling) | |
1348 | bgp->conf->sensors[i].unregister_cooling(bgp, i); | |
1349 | remove_sensors: | |
1350 | for (i--; i >= 0; i--) { | |
1351 | if (bgp->conf->sensors[i].unregister_cooling) | |
1352 | bgp->conf->sensors[i].unregister_cooling(bgp, i); | |
1353 | if (bgp->conf->remove_sensor) | |
1354 | bgp->conf->remove_sensor(bgp, i); | |
1355 | } | |
1356 | ti_bandgap_power(bgp, false); | |
8feaf0ce | 1357 | disable_clk: |
03e859d3 | 1358 | if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
d7f080e6 | 1359 | clk_disable_unprepare(bgp->fclock); |
8feaf0ce | 1360 | put_clks: |
d7f080e6 EV |
1361 | clk_put(bgp->fclock); |
1362 | clk_put(bgp->div_clk); | |
8feaf0ce | 1363 | free_irqs: |
03e859d3 | 1364 | if (TI_BANDGAP_HAS(bgp, TSHUT)) { |
d7f080e6 EV |
1365 | free_irq(gpio_to_irq(bgp->tshut_gpio), NULL); |
1366 | gpio_free(bgp->tshut_gpio); | |
8feaf0ce EV |
1367 | } |
1368 | ||
1369 | return ret; | |
1370 | } | |
1371 | ||
1372 | static | |
03e859d3 | 1373 | int ti_bandgap_remove(struct platform_device *pdev) |
8feaf0ce | 1374 | { |
03e859d3 | 1375 | struct ti_bandgap *bgp = platform_get_drvdata(pdev); |
8feaf0ce EV |
1376 | int i; |
1377 | ||
1378 | /* First thing is to remove sensor interfaces */ | |
d7f080e6 | 1379 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
262235b1 | 1380 | if (bgp->conf->sensors[i].unregister_cooling) |
d7f080e6 | 1381 | bgp->conf->sensors[i].unregister_cooling(bgp, i); |
8feaf0ce | 1382 | |
d7f080e6 EV |
1383 | if (bgp->conf->remove_sensor) |
1384 | bgp->conf->remove_sensor(bgp, i); | |
8feaf0ce EV |
1385 | } |
1386 | ||
03e859d3 | 1387 | ti_bandgap_power(bgp, false); |
8feaf0ce | 1388 | |
03e859d3 | 1389 | if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
d7f080e6 EV |
1390 | clk_disable_unprepare(bgp->fclock); |
1391 | clk_put(bgp->fclock); | |
1392 | clk_put(bgp->div_clk); | |
8feaf0ce | 1393 | |
03e859d3 | 1394 | if (TI_BANDGAP_HAS(bgp, TALERT)) |
d7f080e6 | 1395 | free_irq(bgp->irq, bgp); |
8feaf0ce | 1396 | |
03e859d3 | 1397 | if (TI_BANDGAP_HAS(bgp, TSHUT)) { |
d7f080e6 EV |
1398 | free_irq(gpio_to_irq(bgp->tshut_gpio), NULL); |
1399 | gpio_free(bgp->tshut_gpio); | |
8feaf0ce EV |
1400 | } |
1401 | ||
1402 | return 0; | |
1403 | } | |
1404 | ||
1405 | #ifdef CONFIG_PM | |
03e859d3 | 1406 | static int ti_bandgap_save_ctxt(struct ti_bandgap *bgp) |
8feaf0ce EV |
1407 | { |
1408 | int i; | |
1409 | ||
d7f080e6 | 1410 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce EV |
1411 | struct temp_sensor_registers *tsr; |
1412 | struct temp_sensor_regval *rval; | |
1413 | ||
9879b2c4 | 1414 | rval = &bgp->regval[i]; |
d7f080e6 | 1415 | tsr = bgp->conf->sensors[i].registers; |
8feaf0ce | 1416 | |
03e859d3 EV |
1417 | if (TI_BANDGAP_HAS(bgp, MODE_CONFIG)) |
1418 | rval->bg_mode_ctrl = ti_bandgap_readl(bgp, | |
76d2cd30 | 1419 | tsr->bgap_mode_ctrl); |
03e859d3 EV |
1420 | if (TI_BANDGAP_HAS(bgp, COUNTER)) |
1421 | rval->bg_counter = ti_bandgap_readl(bgp, | |
76d2cd30 | 1422 | tsr->bgap_counter); |
03e859d3 EV |
1423 | if (TI_BANDGAP_HAS(bgp, TALERT)) { |
1424 | rval->bg_threshold = ti_bandgap_readl(bgp, | |
76d2cd30 | 1425 | tsr->bgap_threshold); |
03e859d3 | 1426 | rval->bg_ctrl = ti_bandgap_readl(bgp, |
76d2cd30 | 1427 | tsr->bgap_mask_ctrl); |
8feaf0ce EV |
1428 | } |
1429 | ||
03e859d3 EV |
1430 | if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) |
1431 | rval->tshut_threshold = ti_bandgap_readl(bgp, | |
76d2cd30 | 1432 | tsr->tshut_threshold); |
8feaf0ce EV |
1433 | } |
1434 | ||
1435 | return 0; | |
1436 | } | |
1437 | ||
03e859d3 | 1438 | static int ti_bandgap_restore_ctxt(struct ti_bandgap *bgp) |
8feaf0ce EV |
1439 | { |
1440 | int i; | |
8feaf0ce | 1441 | |
d7f080e6 | 1442 | for (i = 0; i < bgp->conf->sensor_count; i++) { |
8feaf0ce EV |
1443 | struct temp_sensor_registers *tsr; |
1444 | struct temp_sensor_regval *rval; | |
1445 | u32 val = 0; | |
1446 | ||
9879b2c4 | 1447 | rval = &bgp->regval[i]; |
d7f080e6 | 1448 | tsr = bgp->conf->sensors[i].registers; |
8feaf0ce | 1449 | |
03e859d3 EV |
1450 | if (TI_BANDGAP_HAS(bgp, COUNTER)) |
1451 | val = ti_bandgap_readl(bgp, tsr->bgap_counter); | |
8feaf0ce | 1452 | |
03e859d3 EV |
1453 | if (TI_BANDGAP_HAS(bgp, TSHUT_CONFIG)) |
1454 | ti_bandgap_writel(bgp, rval->tshut_threshold, | |
1455 | tsr->tshut_threshold); | |
b87ea759 RF |
1456 | /* Force immediate temperature measurement and update |
1457 | * of the DTEMP field | |
1458 | */ | |
03e859d3 EV |
1459 | ti_bandgap_force_single_read(bgp, i); |
1460 | ||
1461 | if (TI_BANDGAP_HAS(bgp, COUNTER)) | |
1462 | ti_bandgap_writel(bgp, rval->bg_counter, | |
1463 | tsr->bgap_counter); | |
1464 | if (TI_BANDGAP_HAS(bgp, MODE_CONFIG)) | |
1465 | ti_bandgap_writel(bgp, rval->bg_mode_ctrl, | |
1466 | tsr->bgap_mode_ctrl); | |
1467 | if (TI_BANDGAP_HAS(bgp, TALERT)) { | |
1468 | ti_bandgap_writel(bgp, rval->bg_threshold, | |
1469 | tsr->bgap_threshold); | |
1470 | ti_bandgap_writel(bgp, rval->bg_ctrl, | |
1471 | tsr->bgap_mask_ctrl); | |
8feaf0ce EV |
1472 | } |
1473 | } | |
1474 | ||
1475 | return 0; | |
1476 | } | |
1477 | ||
03e859d3 | 1478 | static int ti_bandgap_suspend(struct device *dev) |
8feaf0ce | 1479 | { |
03e859d3 | 1480 | struct ti_bandgap *bgp = dev_get_drvdata(dev); |
8feaf0ce EV |
1481 | int err; |
1482 | ||
03e859d3 EV |
1483 | err = ti_bandgap_save_ctxt(bgp); |
1484 | ti_bandgap_power(bgp, false); | |
6c9c1d66 | 1485 | |
03e859d3 | 1486 | if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
d7f080e6 | 1487 | clk_disable_unprepare(bgp->fclock); |
8feaf0ce EV |
1488 | |
1489 | return err; | |
1490 | } | |
1491 | ||
03e859d3 | 1492 | static int ti_bandgap_resume(struct device *dev) |
8feaf0ce | 1493 | { |
03e859d3 | 1494 | struct ti_bandgap *bgp = dev_get_drvdata(dev); |
8feaf0ce | 1495 | |
03e859d3 | 1496 | if (TI_BANDGAP_HAS(bgp, CLK_CTRL)) |
d7f080e6 | 1497 | clk_prepare_enable(bgp->fclock); |
6c9c1d66 | 1498 | |
03e859d3 | 1499 | ti_bandgap_power(bgp, true); |
8feaf0ce | 1500 | |
03e859d3 | 1501 | return ti_bandgap_restore_ctxt(bgp); |
8feaf0ce | 1502 | } |
5204f8c0 JH |
1503 | static SIMPLE_DEV_PM_OPS(ti_bandgap_dev_pm_ops, ti_bandgap_suspend, |
1504 | ti_bandgap_resume); | |
8feaf0ce | 1505 | |
03e859d3 | 1506 | #define DEV_PM_OPS (&ti_bandgap_dev_pm_ops) |
8feaf0ce EV |
1507 | #else |
1508 | #define DEV_PM_OPS NULL | |
1509 | #endif | |
1510 | ||
03e859d3 | 1511 | static const struct of_device_id of_ti_bandgap_match[] = { |
1a31270e EV |
1512 | #ifdef CONFIG_OMAP4_THERMAL |
1513 | { | |
1514 | .compatible = "ti,omap4430-bandgap", | |
1515 | .data = (void *)&omap4430_data, | |
1516 | }, | |
1517 | { | |
1518 | .compatible = "ti,omap4460-bandgap", | |
1519 | .data = (void *)&omap4460_data, | |
1520 | }, | |
1521 | { | |
1522 | .compatible = "ti,omap4470-bandgap", | |
1523 | .data = (void *)&omap4470_data, | |
1524 | }, | |
949f5a50 EV |
1525 | #endif |
1526 | #ifdef CONFIG_OMAP5_THERMAL | |
1527 | { | |
1528 | .compatible = "ti,omap5430-bandgap", | |
1529 | .data = (void *)&omap5430_data, | |
1530 | }, | |
25870e62 EV |
1531 | #endif |
1532 | #ifdef CONFIG_DRA752_THERMAL | |
1533 | { | |
1534 | .compatible = "ti,dra752-bandgap", | |
1535 | .data = (void *)&dra752_data, | |
1536 | }, | |
1a31270e | 1537 | #endif |
8feaf0ce EV |
1538 | /* Sentinel */ |
1539 | { }, | |
1540 | }; | |
03e859d3 | 1541 | MODULE_DEVICE_TABLE(of, of_ti_bandgap_match); |
8feaf0ce | 1542 | |
03e859d3 EV |
1543 | static struct platform_driver ti_bandgap_sensor_driver = { |
1544 | .probe = ti_bandgap_probe, | |
1545 | .remove = ti_bandgap_remove, | |
8feaf0ce | 1546 | .driver = { |
03e859d3 | 1547 | .name = "ti-soc-thermal", |
8feaf0ce | 1548 | .pm = DEV_PM_OPS, |
03e859d3 | 1549 | .of_match_table = of_ti_bandgap_match, |
8feaf0ce EV |
1550 | }, |
1551 | }; | |
1552 | ||
03e859d3 | 1553 | module_platform_driver(ti_bandgap_sensor_driver); |
8feaf0ce EV |
1554 | |
1555 | MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver"); | |
1556 | MODULE_LICENSE("GPL v2"); | |
03e859d3 | 1557 | MODULE_ALIAS("platform:ti-soc-thermal"); |
8feaf0ce | 1558 | MODULE_AUTHOR("Texas Instrument Inc."); |