2 * OMAP4 Bandgap temperature sensor driver
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>
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.
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.
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
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>
36 #include <linux/mutex.h>
37 #include <linux/reboot.h>
38 #include <linux/of_device.h>
39 #include <linux/of_platform.h>
40 #include <linux/of_irq.h>
42 #include "omap-bandgap.h"
44 static u32
omap_bandgap_readl(struct omap_bandgap
*bg_ptr
, u32 reg
)
46 return readl(bg_ptr
->base
+ reg
);
49 static void omap_bandgap_writel(struct omap_bandgap
*bg_ptr
, u32 val
, u32 reg
)
51 writel(val
, bg_ptr
->base
+ reg
);
54 static int omap_bandgap_power(struct omap_bandgap
*bg_ptr
, bool on
)
56 struct temp_sensor_registers
*tsr
;
60 if (!OMAP_BANDGAP_HAS(bg_ptr
, POWER_SWITCH
))
63 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
64 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
65 ctrl
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
66 ctrl
&= ~tsr
->bgap_tempsoff_mask
;
68 ctrl
|= !on
<< __ffs(tsr
->bgap_tempsoff_mask
);
70 /* write BGAP_TEMPSOFF should be reset to 0 */
71 omap_bandgap_writel(bg_ptr
, ctrl
, tsr
->temp_sensor_ctrl
);
77 /* This is the Talert handler. Call it only if HAS(TALERT) is set */
78 static irqreturn_t
talert_irq_handler(int irq
, void *data
)
80 struct omap_bandgap
*bg_ptr
= data
;
81 struct temp_sensor_registers
*tsr
;
82 u32 t_hot
= 0, t_cold
= 0, temp
, ctrl
;
86 /* Read the status of t_hot */
87 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
88 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
89 t_hot
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_status
);
90 t_hot
&= tsr
->status_hot_mask
;
92 /* Read the status of t_cold */
93 t_cold
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_status
);
94 t_cold
&= tsr
->status_cold_mask
;
96 if (!t_cold
&& !t_hot
)
99 ctrl
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_mask_ctrl
);
101 * One TALERT interrupt: Two sources
102 * If the interrupt is due to t_hot then mask t_hot and
103 * and unmask t_cold else mask t_cold and unmask t_hot
106 ctrl
&= ~tsr
->mask_hot_mask
;
107 ctrl
|= tsr
->mask_cold_mask
;
109 ctrl
&= ~tsr
->mask_cold_mask
;
110 ctrl
|= tsr
->mask_hot_mask
;
113 omap_bandgap_writel(bg_ptr
, ctrl
, tsr
->bgap_mask_ctrl
);
115 /* read temperature */
116 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
117 temp
&= tsr
->bgap_dtemp_mask
;
119 /* report temperature to whom may concern */
120 if (bg_ptr
->conf
->report_temperature
)
121 bg_ptr
->conf
->report_temperature(bg_ptr
, i
);
127 /* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
128 static irqreturn_t
omap_bandgap_tshut_irq_handler(int irq
, void *data
)
130 orderly_poweroff(true);
136 int adc_to_temp_conversion(struct omap_bandgap
*bg_ptr
, int id
, int adc_val
,
139 struct temp_sensor_data
*ts_data
= bg_ptr
->conf
->sensors
[id
].ts_data
;
141 /* look up for temperature in the table and return the temperature */
142 if (adc_val
< ts_data
->adc_start_val
|| adc_val
> ts_data
->adc_end_val
)
145 *t
= bg_ptr
->conv_table
[adc_val
- ts_data
->adc_start_val
];
150 static int temp_to_adc_conversion(long temp
, struct omap_bandgap
*bg_ptr
, int i
,
153 struct temp_sensor_data
*ts_data
= bg_ptr
->conf
->sensors
[i
].ts_data
;
157 high
= ts_data
->adc_end_val
- ts_data
->adc_start_val
;
158 mid
= (high
+ low
) / 2;
160 if (temp
< bg_ptr
->conv_table
[low
] || temp
> bg_ptr
->conv_table
[high
])
164 if (temp
< bg_ptr
->conv_table
[mid
])
168 mid
= (low
+ high
) / 2;
171 *adc
= ts_data
->adc_start_val
+ low
;
176 /* Talert masks. Call it only if HAS(TALERT) is set */
177 static int temp_sensor_unmask_interrupts(struct omap_bandgap
*bg_ptr
, int id
,
178 u32 t_hot
, u32 t_cold
)
180 struct temp_sensor_registers
*tsr
;
183 /* Read the current on die temperature */
184 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
185 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
186 temp
&= tsr
->bgap_dtemp_mask
;
188 reg_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_mask_ctrl
);
190 reg_val
|= tsr
->mask_hot_mask
;
192 reg_val
&= ~tsr
->mask_hot_mask
;
195 reg_val
|= tsr
->mask_cold_mask
;
197 reg_val
&= ~tsr
->mask_cold_mask
;
198 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_mask_ctrl
);
204 int add_hyst(int adc_val
, int hyst_val
, struct omap_bandgap
*bg_ptr
, int i
,
209 ret
= adc_to_temp_conversion(bg_ptr
, i
, adc_val
, &temp
);
215 return temp_to_adc_conversion(temp
, bg_ptr
, i
, sum
);
218 /* Talert Thot threshold. Call it only if HAS(TALERT) is set */
220 int temp_sensor_configure_thot(struct omap_bandgap
*bg_ptr
, int id
, int t_hot
)
222 struct temp_sensor_data
*ts_data
= bg_ptr
->conf
->sensors
[id
].ts_data
;
223 struct temp_sensor_registers
*tsr
;
224 u32 thresh_val
, reg_val
;
227 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
229 /* obtain the T cold value */
230 thresh_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
231 cold
= (thresh_val
& tsr
->threshold_tcold_mask
) >>
232 __ffs(tsr
->threshold_tcold_mask
);
234 /* change the t_cold to t_hot - 5000 millidegrees */
235 err
|= add_hyst(t_hot
, -ts_data
->hyst_val
, bg_ptr
, id
, &cold
);
236 /* write the new t_cold value */
237 reg_val
= thresh_val
& (~tsr
->threshold_tcold_mask
);
238 reg_val
|= cold
<< __ffs(tsr
->threshold_tcold_mask
);
239 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
240 thresh_val
= reg_val
;
243 /* write the new t_hot value */
244 reg_val
= thresh_val
& ~tsr
->threshold_thot_mask
;
245 reg_val
|= (t_hot
<< __ffs(tsr
->threshold_thot_mask
));
246 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
248 dev_err(bg_ptr
->dev
, "failed to reprogram thot threshold\n");
252 return temp_sensor_unmask_interrupts(bg_ptr
, id
, t_hot
, cold
);
255 /* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
257 int temp_sensor_init_talert_thresholds(struct omap_bandgap
*bg_ptr
, int id
,
258 int t_hot
, int t_cold
)
260 struct temp_sensor_registers
*tsr
;
261 u32 reg_val
, thresh_val
;
263 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
264 thresh_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
266 /* write the new t_cold value */
267 reg_val
= thresh_val
& ~tsr
->threshold_tcold_mask
;
268 reg_val
|= (t_cold
<< __ffs(tsr
->threshold_tcold_mask
));
269 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
271 thresh_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
273 /* write the new t_hot value */
274 reg_val
= thresh_val
& ~tsr
->threshold_thot_mask
;
275 reg_val
|= (t_hot
<< __ffs(tsr
->threshold_thot_mask
));
276 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
278 reg_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_mask_ctrl
);
279 reg_val
|= tsr
->mask_hot_mask
;
280 reg_val
|= tsr
->mask_cold_mask
;
281 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_mask_ctrl
);
286 /* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
288 int temp_sensor_configure_tcold(struct omap_bandgap
*bg_ptr
, int id
,
291 struct temp_sensor_data
*ts_data
= bg_ptr
->conf
->sensors
[id
].ts_data
;
292 struct temp_sensor_registers
*tsr
;
293 u32 thresh_val
, reg_val
;
296 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
297 /* obtain the T cold value */
298 thresh_val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
299 hot
= (thresh_val
& tsr
->threshold_thot_mask
) >>
300 __ffs(tsr
->threshold_thot_mask
);
303 /* change the t_hot to t_cold + 5000 millidegrees */
304 err
|= add_hyst(t_cold
, ts_data
->hyst_val
, bg_ptr
, id
, &hot
);
305 /* write the new t_hot value */
306 reg_val
= thresh_val
& (~tsr
->threshold_thot_mask
);
307 reg_val
|= hot
<< __ffs(tsr
->threshold_thot_mask
);
308 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
309 thresh_val
= reg_val
;
312 /* write the new t_cold value */
313 reg_val
= thresh_val
& ~tsr
->threshold_tcold_mask
;
314 reg_val
|= (t_cold
<< __ffs(tsr
->threshold_tcold_mask
));
315 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->bgap_threshold
);
317 dev_err(bg_ptr
->dev
, "failed to reprogram tcold threshold\n");
321 return temp_sensor_unmask_interrupts(bg_ptr
, id
, hot
, t_cold
);
324 /* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
325 static int temp_sensor_configure_tshut_hot(struct omap_bandgap
*bg_ptr
,
326 int id
, int tshut_hot
)
328 struct temp_sensor_registers
*tsr
;
331 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
332 reg_val
= omap_bandgap_readl(bg_ptr
, tsr
->tshut_threshold
);
333 reg_val
&= ~tsr
->tshut_hot_mask
;
334 reg_val
|= tshut_hot
<< __ffs(tsr
->tshut_hot_mask
);
335 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->tshut_threshold
);
340 /* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
341 static int temp_sensor_configure_tshut_cold(struct omap_bandgap
*bg_ptr
,
342 int id
, int tshut_cold
)
344 struct temp_sensor_registers
*tsr
;
347 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
348 reg_val
= omap_bandgap_readl(bg_ptr
, tsr
->tshut_threshold
);
349 reg_val
&= ~tsr
->tshut_cold_mask
;
350 reg_val
|= tshut_cold
<< __ffs(tsr
->tshut_cold_mask
);
351 omap_bandgap_writel(bg_ptr
, reg_val
, tsr
->tshut_threshold
);
356 /* This is counter config. Call it only if HAS(COUNTER) is set */
357 static int configure_temp_sensor_counter(struct omap_bandgap
*bg_ptr
, int id
,
360 struct temp_sensor_registers
*tsr
;
363 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
364 val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_counter
);
365 val
&= ~tsr
->counter_mask
;
366 val
|= counter
<< __ffs(tsr
->counter_mask
);
367 omap_bandgap_writel(bg_ptr
, val
, tsr
->bgap_counter
);
372 #define bandgap_is_valid(b) \
374 #define bandgap_is_valid_sensor_id(b, i) \
375 ((i) >= 0 && (i) < (b)->conf->sensor_count)
376 static inline int omap_bandgap_validate(struct omap_bandgap
*bg_ptr
, int id
)
378 if (!bandgap_is_valid(bg_ptr
)) {
379 pr_err("%s: invalid bandgap pointer\n", __func__
);
383 if (!bandgap_is_valid_sensor_id(bg_ptr
, id
)) {
384 dev_err(bg_ptr
->dev
, "%s: sensor id out of range (%d)\n",
394 * omap_bandgap_read_thot() - reads sensor current thot
395 * @bg_ptr - pointer to bandgap instance
397 * @thot - resulting current thot value
399 * returns 0 on success or the proper error code
401 int omap_bandgap_read_thot(struct omap_bandgap
*bg_ptr
, int id
,
404 struct temp_sensor_registers
*tsr
;
408 ret
= omap_bandgap_validate(bg_ptr
, id
);
412 if (!OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
415 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
416 temp
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
417 temp
= (temp
& tsr
->threshold_thot_mask
) >>
418 __ffs(tsr
->threshold_thot_mask
);
419 ret
|= adc_to_temp_conversion(bg_ptr
, id
, temp
, &temp
);
421 dev_err(bg_ptr
->dev
, "failed to read thot\n");
431 * omap_bandgap_write_thot() - sets sensor current thot
432 * @bg_ptr - pointer to bandgap instance
434 * @val - desired thot value
436 * returns 0 on success or the proper error code
438 int omap_bandgap_write_thot(struct omap_bandgap
*bg_ptr
, int id
, int val
)
440 struct temp_sensor_data
*ts_data
;
441 struct temp_sensor_registers
*tsr
;
445 ret
= omap_bandgap_validate(bg_ptr
, id
);
449 if (!OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
452 ts_data
= bg_ptr
->conf
->sensors
[id
].ts_data
;
453 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
455 if (val
< ts_data
->min_temp
+ ts_data
->hyst_val
)
457 ret
= temp_to_adc_conversion(val
, bg_ptr
, id
, &t_hot
);
461 mutex_lock(&bg_ptr
->bg_mutex
);
462 temp_sensor_configure_thot(bg_ptr
, id
, t_hot
);
463 mutex_unlock(&bg_ptr
->bg_mutex
);
469 * omap_bandgap_read_tcold() - reads sensor current tcold
470 * @bg_ptr - pointer to bandgap instance
472 * @tcold - resulting current tcold value
474 * returns 0 on success or the proper error code
476 int omap_bandgap_read_tcold(struct omap_bandgap
*bg_ptr
, int id
,
479 struct temp_sensor_registers
*tsr
;
483 ret
= omap_bandgap_validate(bg_ptr
, id
);
487 if (!OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
490 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
491 temp
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_threshold
);
492 temp
= (temp
& tsr
->threshold_tcold_mask
)
493 >> __ffs(tsr
->threshold_tcold_mask
);
494 ret
|= adc_to_temp_conversion(bg_ptr
, id
, temp
, &temp
);
504 * omap_bandgap_write_tcold() - sets the sensor tcold
505 * @bg_ptr - pointer to bandgap instance
507 * @val - desired tcold value
509 * returns 0 on success or the proper error code
511 int omap_bandgap_write_tcold(struct omap_bandgap
*bg_ptr
, int id
, int val
)
513 struct temp_sensor_data
*ts_data
;
514 struct temp_sensor_registers
*tsr
;
518 ret
= omap_bandgap_validate(bg_ptr
, id
);
522 if (!OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
525 ts_data
= bg_ptr
->conf
->sensors
[id
].ts_data
;
526 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
527 if (val
> ts_data
->max_temp
+ ts_data
->hyst_val
)
530 ret
= temp_to_adc_conversion(val
, bg_ptr
, id
, &t_cold
);
534 mutex_lock(&bg_ptr
->bg_mutex
);
535 temp_sensor_configure_tcold(bg_ptr
, id
, t_cold
);
536 mutex_unlock(&bg_ptr
->bg_mutex
);
542 * omap_bandgap_read_update_interval() - read the sensor update interval
543 * @bg_ptr - pointer to bandgap instance
545 * @interval - resulting update interval in miliseconds
547 * returns 0 on success or the proper error code
549 int omap_bandgap_read_update_interval(struct omap_bandgap
*bg_ptr
, int id
,
552 struct temp_sensor_registers
*tsr
;
556 ret
= omap_bandgap_validate(bg_ptr
, id
);
560 if (!OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
563 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
564 time
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_counter
);
567 time
= (time
& tsr
->counter_mask
) >> __ffs(tsr
->counter_mask
);
568 time
= time
* 1000 / bg_ptr
->clk_rate
;
576 * omap_bandgap_write_update_interval() - set the update interval
577 * @bg_ptr - pointer to bandgap instance
579 * @interval - desired update interval in miliseconds
581 * returns 0 on success or the proper error code
583 int omap_bandgap_write_update_interval(struct omap_bandgap
*bg_ptr
,
584 int id
, u32 interval
)
586 int ret
= omap_bandgap_validate(bg_ptr
, id
);
590 if (!OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
593 interval
= interval
* bg_ptr
->clk_rate
/ 1000;
594 mutex_lock(&bg_ptr
->bg_mutex
);
595 configure_temp_sensor_counter(bg_ptr
, id
, interval
);
596 mutex_unlock(&bg_ptr
->bg_mutex
);
602 * omap_bandgap_read_temperature() - report current temperature
603 * @bg_ptr - pointer to bandgap instance
605 * @temperature - resulting temperature
607 * returns 0 on success or the proper error code
609 int omap_bandgap_read_temperature(struct omap_bandgap
*bg_ptr
, int id
,
612 struct temp_sensor_registers
*tsr
;
616 ret
= omap_bandgap_validate(bg_ptr
, id
);
620 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
621 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
622 temp
&= tsr
->bgap_dtemp_mask
;
624 ret
|= adc_to_temp_conversion(bg_ptr
, id
, temp
, &temp
);
634 * omap_bandgap_set_sensor_data() - helper function to store thermal
635 * framework related data.
636 * @bg_ptr - pointer to bandgap instance
638 * @data - thermal framework related data to be stored
640 * returns 0 on success or the proper error code
642 int omap_bandgap_set_sensor_data(struct omap_bandgap
*bg_ptr
, int id
,
645 int ret
= omap_bandgap_validate(bg_ptr
, id
);
649 bg_ptr
->conf
->sensors
[id
].data
= data
;
655 * omap_bandgap_get_sensor_data() - helper function to get thermal
656 * framework related data.
657 * @bg_ptr - pointer to bandgap instance
660 * returns data stored by set function with sensor id on success or NULL
662 void *omap_bandgap_get_sensor_data(struct omap_bandgap
*bg_ptr
, int id
)
664 int ret
= omap_bandgap_validate(bg_ptr
, id
);
668 return bg_ptr
->conf
->sensors
[id
].data
;
672 omap_bandgap_force_single_read(struct omap_bandgap
*bg_ptr
, int id
)
674 struct temp_sensor_registers
*tsr
;
675 u32 temp
= 0, counter
= 1000;
677 tsr
= bg_ptr
->conf
->sensors
[id
].registers
;
678 /* Select single conversion mode */
679 if (OMAP_BANDGAP_HAS(bg_ptr
, MODE_CONFIG
)) {
680 temp
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_mode_ctrl
);
681 temp
&= ~(1 << __ffs(tsr
->mode_ctrl_mask
));
682 omap_bandgap_writel(bg_ptr
, temp
, tsr
->bgap_mode_ctrl
);
685 /* Start of Conversion = 1 */
686 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
687 temp
|= 1 << __ffs(tsr
->bgap_soc_mask
);
688 omap_bandgap_writel(bg_ptr
, temp
, tsr
->temp_sensor_ctrl
);
689 /* Wait until DTEMP is updated */
690 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
691 temp
&= (tsr
->bgap_dtemp_mask
);
692 while ((temp
== 0) && --counter
) {
693 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
694 temp
&= (tsr
->bgap_dtemp_mask
);
696 /* Start of Conversion = 0 */
697 temp
= omap_bandgap_readl(bg_ptr
, tsr
->temp_sensor_ctrl
);
698 temp
&= ~(1 << __ffs(tsr
->bgap_soc_mask
));
699 omap_bandgap_writel(bg_ptr
, temp
, tsr
->temp_sensor_ctrl
);
705 * enable_continuous_mode() - One time enabling of continuous conversion mode
706 * @bg_ptr - pointer to scm instance
708 * Call this function only if HAS(MODE_CONFIG) is set
710 static int enable_continuous_mode(struct omap_bandgap
*bg_ptr
)
712 struct temp_sensor_registers
*tsr
;
716 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
717 /* Perform a single read just before enabling continuous */
718 omap_bandgap_force_single_read(bg_ptr
, i
);
719 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
720 val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_mode_ctrl
);
721 val
|= 1 << __ffs(tsr
->mode_ctrl_mask
);
722 omap_bandgap_writel(bg_ptr
, val
, tsr
->bgap_mode_ctrl
);
728 static int omap_bandgap_tshut_init(struct omap_bandgap
*bg_ptr
,
729 struct platform_device
*pdev
)
731 int gpio_nr
= bg_ptr
->tshut_gpio
;
734 /* Request for gpio_86 line */
735 status
= gpio_request(gpio_nr
, "tshut");
738 "Could not request for TSHUT GPIO:%i\n", 86);
741 status
= gpio_direction_input(gpio_nr
);
744 "Cannot set input TSHUT GPIO %d\n", gpio_nr
);
748 status
= request_irq(gpio_to_irq(gpio_nr
),
749 omap_bandgap_tshut_irq_handler
,
750 IRQF_TRIGGER_RISING
, "tshut",
754 dev_err(bg_ptr
->dev
, "request irq failed for TSHUT");
760 /* Initialization of Talert. Call it only if HAS(TALERT) is set */
761 static int omap_bandgap_talert_init(struct omap_bandgap
*bg_ptr
,
762 struct platform_device
*pdev
)
766 bg_ptr
->irq
= platform_get_irq(pdev
, 0);
767 if (bg_ptr
->irq
< 0) {
768 dev_err(&pdev
->dev
, "get_irq failed\n");
771 ret
= request_threaded_irq(bg_ptr
->irq
, NULL
,
773 IRQF_TRIGGER_HIGH
| IRQF_ONESHOT
,
776 dev_err(&pdev
->dev
, "Request threaded irq failed.\n");
783 static const struct of_device_id of_omap_bandgap_match
[];
784 static struct omap_bandgap
*omap_bandgap_build(struct platform_device
*pdev
)
786 struct device_node
*node
= pdev
->dev
.of_node
;
787 const struct of_device_id
*of_id
;
788 struct omap_bandgap
*bg_ptr
;
789 struct resource
*res
;
793 /* just for the sake */
795 dev_err(&pdev
->dev
, "no platform information available\n");
796 return ERR_PTR(-EINVAL
);
799 bg_ptr
= devm_kzalloc(&pdev
->dev
, sizeof(struct omap_bandgap
),
802 dev_err(&pdev
->dev
, "Unable to allocate mem for driver ref\n");
803 return ERR_PTR(-ENOMEM
);
806 of_id
= of_match_device(of_omap_bandgap_match
, &pdev
->dev
);
808 bg_ptr
->conf
= of_id
->data
;
814 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, i
);
817 chunk
= devm_request_and_ioremap(&pdev
->dev
, res
);
819 bg_ptr
->base
= chunk
;
822 "failed to request the IO (%d:%pR).\n",
824 return ERR_PTR(-EADDRNOTAVAIL
);
829 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT
)) {
830 if (of_property_read_u32(node
, "ti,tshut-gpio", &prop
) < 0) {
831 dev_err(&pdev
->dev
, "missing tshut gpio in device tree\n");
832 return ERR_PTR(-EINVAL
);
834 bg_ptr
->tshut_gpio
= prop
;
835 if (!gpio_is_valid(bg_ptr
->tshut_gpio
)) {
836 dev_err(&pdev
->dev
, "invalid gpio for tshut (%d)\n",
838 return ERR_PTR(-EINVAL
);
846 int __devinit
omap_bandgap_probe(struct platform_device
*pdev
)
848 struct omap_bandgap
*bg_ptr
;
849 int clk_rate
, ret
= 0, i
;
851 bg_ptr
= omap_bandgap_build(pdev
);
852 if (IS_ERR_OR_NULL(bg_ptr
)) {
853 dev_err(&pdev
->dev
, "failed to fetch platform data\n");
854 return PTR_ERR(bg_ptr
);
856 bg_ptr
->dev
= &pdev
->dev
;
858 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT
)) {
859 ret
= omap_bandgap_tshut_init(bg_ptr
, pdev
);
862 "failed to initialize system tshut IRQ\n");
867 bg_ptr
->fclock
= clk_get(NULL
, bg_ptr
->conf
->fclock_name
);
868 ret
= IS_ERR_OR_NULL(bg_ptr
->fclock
);
870 dev_err(&pdev
->dev
, "failed to request fclock reference\n");
874 bg_ptr
->div_clk
= clk_get(NULL
, bg_ptr
->conf
->div_ck_name
);
875 ret
= IS_ERR_OR_NULL(bg_ptr
->div_clk
);
878 "failed to request div_ts_ck clock ref\n");
882 bg_ptr
->conv_table
= bg_ptr
->conf
->conv_table
;
883 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
884 struct temp_sensor_registers
*tsr
;
887 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
889 * check if the efuse has a non-zero value if not
890 * it is an untrimmed sample and the temperatures
891 * may not be accurate
893 val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_efuse
);
896 "Non-trimmed BGAP, Temp not accurate\n");
899 clk_rate
= clk_round_rate(bg_ptr
->div_clk
,
900 bg_ptr
->conf
->sensors
[0].ts_data
->max_freq
);
901 if (clk_rate
< bg_ptr
->conf
->sensors
[0].ts_data
->min_freq
||
902 clk_rate
== 0xffffffff) {
904 dev_err(&pdev
->dev
, "wrong clock rate (%d)\n", clk_rate
);
908 ret
= clk_set_rate(bg_ptr
->div_clk
, clk_rate
);
910 dev_err(&pdev
->dev
, "Cannot re-set clock rate. Continuing\n");
912 bg_ptr
->clk_rate
= clk_rate
;
913 clk_enable(bg_ptr
->fclock
);
915 mutex_init(&bg_ptr
->bg_mutex
);
916 bg_ptr
->dev
= &pdev
->dev
;
917 platform_set_drvdata(pdev
, bg_ptr
);
919 omap_bandgap_power(bg_ptr
, true);
921 /* Set default counter to 1 for now */
922 if (OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
923 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++)
924 configure_temp_sensor_counter(bg_ptr
, i
, 1);
926 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
927 struct temp_sensor_data
*ts_data
;
929 ts_data
= bg_ptr
->conf
->sensors
[i
].ts_data
;
931 if (OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
932 temp_sensor_init_talert_thresholds(bg_ptr
, i
,
935 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT_CONFIG
)) {
936 temp_sensor_configure_tshut_hot(bg_ptr
, i
,
938 temp_sensor_configure_tshut_cold(bg_ptr
, i
,
939 ts_data
->tshut_cold
);
943 if (OMAP_BANDGAP_HAS(bg_ptr
, MODE_CONFIG
))
944 enable_continuous_mode(bg_ptr
);
946 /* Set .250 seconds time as default counter */
947 if (OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
948 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++)
949 configure_temp_sensor_counter(bg_ptr
, i
,
950 bg_ptr
->clk_rate
/ 4);
952 /* Every thing is good? Then expose the sensors */
953 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
956 if (bg_ptr
->conf
->sensors
[i
].register_cooling
)
957 bg_ptr
->conf
->sensors
[i
].register_cooling(bg_ptr
, i
);
959 domain
= bg_ptr
->conf
->sensors
[i
].domain
;
960 if (bg_ptr
->conf
->expose_sensor
)
961 bg_ptr
->conf
->expose_sensor(bg_ptr
, i
, domain
);
965 * Enable the Interrupts once everything is set. Otherwise irq handler
966 * might be called as soon as it is enabled where as rest of framework
967 * is still getting initialised.
969 if (OMAP_BANDGAP_HAS(bg_ptr
, TALERT
)) {
970 ret
= omap_bandgap_talert_init(bg_ptr
, pdev
);
972 dev_err(&pdev
->dev
, "failed to initialize Talert IRQ\n");
973 i
= bg_ptr
->conf
->sensor_count
;
981 clk_disable(bg_ptr
->fclock
);
983 clk_put(bg_ptr
->fclock
);
984 clk_put(bg_ptr
->div_clk
);
986 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT
)) {
987 free_irq(gpio_to_irq(bg_ptr
->tshut_gpio
), NULL
);
988 gpio_free(bg_ptr
->tshut_gpio
);
995 int __devexit
omap_bandgap_remove(struct platform_device
*pdev
)
997 struct omap_bandgap
*bg_ptr
= platform_get_drvdata(pdev
);
1000 /* First thing is to remove sensor interfaces */
1001 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
1002 if (bg_ptr
->conf
->sensors
[i
].register_cooling
)
1003 bg_ptr
->conf
->sensors
[i
].unregister_cooling(bg_ptr
, i
);
1005 if (bg_ptr
->conf
->remove_sensor
)
1006 bg_ptr
->conf
->remove_sensor(bg_ptr
, i
);
1009 omap_bandgap_power(bg_ptr
, false);
1011 clk_disable(bg_ptr
->fclock
);
1012 clk_put(bg_ptr
->fclock
);
1013 clk_put(bg_ptr
->div_clk
);
1015 if (OMAP_BANDGAP_HAS(bg_ptr
, TALERT
))
1016 free_irq(bg_ptr
->irq
, bg_ptr
);
1018 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT
)) {
1019 free_irq(gpio_to_irq(bg_ptr
->tshut_gpio
), NULL
);
1020 gpio_free(bg_ptr
->tshut_gpio
);
1027 static int omap_bandgap_save_ctxt(struct omap_bandgap
*bg_ptr
)
1031 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
1032 struct temp_sensor_registers
*tsr
;
1033 struct temp_sensor_regval
*rval
;
1035 rval
= &bg_ptr
->conf
->sensors
[i
].regval
;
1036 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
1038 if (OMAP_BANDGAP_HAS(bg_ptr
, MODE_CONFIG
))
1039 rval
->bg_mode_ctrl
= omap_bandgap_readl(bg_ptr
,
1040 tsr
->bgap_mode_ctrl
);
1041 if (OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
1042 rval
->bg_counter
= omap_bandgap_readl(bg_ptr
,
1044 if (OMAP_BANDGAP_HAS(bg_ptr
, TALERT
)) {
1045 rval
->bg_threshold
= omap_bandgap_readl(bg_ptr
,
1046 tsr
->bgap_threshold
);
1047 rval
->bg_ctrl
= omap_bandgap_readl(bg_ptr
,
1048 tsr
->bgap_mask_ctrl
);
1051 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT_CONFIG
))
1052 rval
->tshut_threshold
= omap_bandgap_readl(bg_ptr
,
1053 tsr
->tshut_threshold
);
1059 static int omap_bandgap_restore_ctxt(struct omap_bandgap
*bg_ptr
)
1064 for (i
= 0; i
< bg_ptr
->conf
->sensor_count
; i
++) {
1065 struct temp_sensor_registers
*tsr
;
1066 struct temp_sensor_regval
*rval
;
1069 rval
= &bg_ptr
->conf
->sensors
[i
].regval
;
1070 tsr
= bg_ptr
->conf
->sensors
[i
].registers
;
1072 if (OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
1073 val
= omap_bandgap_readl(bg_ptr
, tsr
->bgap_counter
);
1076 if (OMAP_BANDGAP_HAS(bg_ptr
, TSHUT_CONFIG
))
1077 omap_bandgap_writel(bg_ptr
,
1078 rval
->tshut_threshold
,
1079 tsr
->tshut_threshold
);
1080 /* Force immediate temperature measurement and update
1081 * of the DTEMP field
1083 omap_bandgap_force_single_read(bg_ptr
, i
);
1085 if (OMAP_BANDGAP_HAS(bg_ptr
, COUNTER
))
1086 omap_bandgap_writel(bg_ptr
, rval
->bg_counter
,
1088 if (OMAP_BANDGAP_HAS(bg_ptr
, MODE_CONFIG
))
1089 omap_bandgap_writel(bg_ptr
, rval
->bg_mode_ctrl
,
1090 tsr
->bgap_mode_ctrl
);
1091 if (OMAP_BANDGAP_HAS(bg_ptr
, TALERT
)) {
1092 omap_bandgap_writel(bg_ptr
,
1094 tsr
->bgap_threshold
);
1095 omap_bandgap_writel(bg_ptr
, rval
->bg_ctrl
,
1096 tsr
->bgap_mask_ctrl
);
1099 temp
= omap_bandgap_readl(bg_ptr
,
1100 tsr
->temp_sensor_ctrl
);
1101 temp
&= (tsr
->bgap_dtemp_mask
);
1102 omap_bandgap_force_single_read(bg_ptr
, i
);
1103 if (temp
== 0 && OMAP_BANDGAP_HAS(bg_ptr
, TALERT
)) {
1104 temp
= omap_bandgap_readl(bg_ptr
,
1105 tsr
->bgap_mask_ctrl
);
1106 temp
|= 1 << __ffs(tsr
->mode_ctrl_mask
);
1107 omap_bandgap_writel(bg_ptr
, temp
,
1108 tsr
->bgap_mask_ctrl
);
1116 static int omap_bandgap_suspend(struct device
*dev
)
1118 struct omap_bandgap
*bg_ptr
= dev_get_drvdata(dev
);
1121 err
= omap_bandgap_save_ctxt(bg_ptr
);
1122 omap_bandgap_power(bg_ptr
, false);
1123 clk_disable(bg_ptr
->fclock
);
1128 static int omap_bandgap_resume(struct device
*dev
)
1130 struct omap_bandgap
*bg_ptr
= dev_get_drvdata(dev
);
1132 clk_enable(bg_ptr
->fclock
);
1133 omap_bandgap_power(bg_ptr
, true);
1135 return omap_bandgap_restore_ctxt(bg_ptr
);
1137 static const struct dev_pm_ops omap_bandgap_dev_pm_ops
= {
1138 SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend
,
1139 omap_bandgap_resume
)
1142 #define DEV_PM_OPS (&omap_bandgap_dev_pm_ops)
1144 #define DEV_PM_OPS NULL
1147 static const struct of_device_id of_omap_bandgap_match
[] = {
1148 #ifdef CONFIG_OMAP4_THERMAL
1150 .compatible
= "ti,omap4430-bandgap",
1151 .data
= (void *)&omap4430_data
,
1154 .compatible
= "ti,omap4460-bandgap",
1155 .data
= (void *)&omap4460_data
,
1158 .compatible
= "ti,omap4470-bandgap",
1159 .data
= (void *)&omap4470_data
,
1162 #ifdef CONFIG_OMAP5_THERMAL
1164 .compatible
= "ti,omap5430-bandgap",
1165 .data
= (void *)&omap5430_data
,
1171 MODULE_DEVICE_TABLE(of
, of_omap_bandgap_match
);
1173 static struct platform_driver omap_bandgap_sensor_driver
= {
1174 .probe
= omap_bandgap_probe
,
1175 .remove
= omap_bandgap_remove
,
1177 .name
= "omap-bandgap",
1179 .of_match_table
= of_omap_bandgap_match
,
1183 module_platform_driver(omap_bandgap_sensor_driver
);
1185 MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
1186 MODULE_LICENSE("GPL v2");
1187 MODULE_ALIAS("platform:omap-bandgap");
1188 MODULE_AUTHOR("Texas Instrument Inc.");