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>
43 #include "omap-bandgap.h"
45 static u32 omap_bandgap_readl(struct omap_bandgap *bg_ptr, u32 reg)
47 return readl(bg_ptr->base + reg);
50 static void omap_bandgap_writel(struct omap_bandgap *bg_ptr, u32 val, u32 reg)
52 writel(val, bg_ptr->base + reg);
55 static int omap_bandgap_power(struct omap_bandgap *bg_ptr, bool on)
57 struct temp_sensor_registers *tsr;
61 if (!OMAP_BANDGAP_HAS(bg_ptr, POWER_SWITCH))
64 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
65 tsr = bg_ptr->conf->sensors[i].registers;
66 ctrl = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
67 ctrl &= ~tsr->bgap_tempsoff_mask;
69 ctrl |= !on << __ffs(tsr->bgap_tempsoff_mask);
71 /* write BGAP_TEMPSOFF should be reset to 0 */
72 omap_bandgap_writel(bg_ptr, ctrl, tsr->temp_sensor_ctrl);
78 /* This is the Talert handler. Call it only if HAS(TALERT) is set */
79 static irqreturn_t talert_irq_handler(int irq, void *data)
81 struct omap_bandgap *bg_ptr = data;
82 struct temp_sensor_registers *tsr;
83 u32 t_hot = 0, t_cold = 0, temp, ctrl;
87 /* Read the status of t_hot */
88 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
89 tsr = bg_ptr->conf->sensors[i].registers;
90 t_hot = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
91 t_hot &= tsr->status_hot_mask;
93 /* Read the status of t_cold */
94 t_cold = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
95 t_cold &= tsr->status_cold_mask;
97 if (!t_cold && !t_hot)
100 ctrl = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
102 * One TALERT interrupt: Two sources
103 * If the interrupt is due to t_hot then mask t_hot and
104 * and unmask t_cold else mask t_cold and unmask t_hot
107 ctrl &= ~tsr->mask_hot_mask;
108 ctrl |= tsr->mask_cold_mask;
110 ctrl &= ~tsr->mask_cold_mask;
111 ctrl |= tsr->mask_hot_mask;
114 omap_bandgap_writel(bg_ptr, ctrl, tsr->bgap_mask_ctrl);
117 "%s: IRQ from %s sensor: hotevent %d coldevent %d\n",
118 __func__, bg_ptr->conf->sensors[i].domain,
121 /* read temperature */
122 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
123 temp &= tsr->bgap_dtemp_mask;
125 /* report temperature to whom may concern */
126 if (bg_ptr->conf->report_temperature)
127 bg_ptr->conf->report_temperature(bg_ptr, i);
133 /* This is the Tshut handler. Call it only if HAS(TSHUT) is set */
134 static irqreturn_t omap_bandgap_tshut_irq_handler(int irq, void *data)
136 orderly_poweroff(true);
142 int adc_to_temp_conversion(struct omap_bandgap *bg_ptr, int id, int adc_val,
145 struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
147 /* look up for temperature in the table and return the temperature */
148 if (adc_val < ts_data->adc_start_val || adc_val > ts_data->adc_end_val)
151 *t = bg_ptr->conv_table[adc_val - ts_data->adc_start_val];
156 static int temp_to_adc_conversion(long temp, struct omap_bandgap *bg_ptr, int i,
159 struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[i].ts_data;
163 high = ts_data->adc_end_val - ts_data->adc_start_val;
164 mid = (high + low) / 2;
166 if (temp < bg_ptr->conv_table[low] || temp > bg_ptr->conv_table[high])
170 if (temp < bg_ptr->conv_table[mid])
174 mid = (low + high) / 2;
177 *adc = ts_data->adc_start_val + low;
182 /* Talert masks. Call it only if HAS(TALERT) is set */
183 static int temp_sensor_unmask_interrupts(struct omap_bandgap *bg_ptr, int id,
184 u32 t_hot, u32 t_cold)
186 struct temp_sensor_registers *tsr;
189 /* Read the current on die temperature */
190 tsr = bg_ptr->conf->sensors[id].registers;
191 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
192 temp &= tsr->bgap_dtemp_mask;
194 reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
196 reg_val |= tsr->mask_hot_mask;
198 reg_val &= ~tsr->mask_hot_mask;
201 reg_val |= tsr->mask_cold_mask;
203 reg_val &= ~tsr->mask_cold_mask;
204 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
210 int add_hyst(int adc_val, int hyst_val, struct omap_bandgap *bg_ptr, int i,
215 ret = adc_to_temp_conversion(bg_ptr, i, adc_val, &temp);
221 return temp_to_adc_conversion(temp, bg_ptr, i, sum);
224 /* Talert Thot threshold. Call it only if HAS(TALERT) is set */
226 int temp_sensor_configure_thot(struct omap_bandgap *bg_ptr, int id, int t_hot)
228 struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
229 struct temp_sensor_registers *tsr;
230 u32 thresh_val, reg_val;
233 tsr = bg_ptr->conf->sensors[id].registers;
235 /* obtain the T cold value */
236 thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
237 cold = (thresh_val & tsr->threshold_tcold_mask) >>
238 __ffs(tsr->threshold_tcold_mask);
240 /* change the t_cold to t_hot - 5000 millidegrees */
241 err |= add_hyst(t_hot, -ts_data->hyst_val, bg_ptr, id, &cold);
242 /* write the new t_cold value */
243 reg_val = thresh_val & (~tsr->threshold_tcold_mask);
244 reg_val |= cold << __ffs(tsr->threshold_tcold_mask);
245 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
246 thresh_val = reg_val;
249 /* write the new t_hot value */
250 reg_val = thresh_val & ~tsr->threshold_thot_mask;
251 reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
252 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
254 dev_err(bg_ptr->dev, "failed to reprogram thot threshold\n");
258 return temp_sensor_unmask_interrupts(bg_ptr, id, t_hot, cold);
261 /* Talert Thot and Tcold thresholds. Call it only if HAS(TALERT) is set */
263 int temp_sensor_init_talert_thresholds(struct omap_bandgap *bg_ptr, int id,
264 int t_hot, int t_cold)
266 struct temp_sensor_registers *tsr;
267 u32 reg_val, thresh_val;
269 tsr = bg_ptr->conf->sensors[id].registers;
270 thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
272 /* write the new t_cold value */
273 reg_val = thresh_val & ~tsr->threshold_tcold_mask;
274 reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
275 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
277 thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
279 /* write the new t_hot value */
280 reg_val = thresh_val & ~tsr->threshold_thot_mask;
281 reg_val |= (t_hot << __ffs(tsr->threshold_thot_mask));
282 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
284 reg_val = omap_bandgap_readl(bg_ptr, tsr->bgap_mask_ctrl);
285 reg_val |= tsr->mask_hot_mask;
286 reg_val |= tsr->mask_cold_mask;
287 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_mask_ctrl);
292 /* Talert Tcold threshold. Call it only if HAS(TALERT) is set */
294 int temp_sensor_configure_tcold(struct omap_bandgap *bg_ptr, int id,
297 struct temp_sensor_data *ts_data = bg_ptr->conf->sensors[id].ts_data;
298 struct temp_sensor_registers *tsr;
299 u32 thresh_val, reg_val;
302 tsr = bg_ptr->conf->sensors[id].registers;
303 /* obtain the T cold value */
304 thresh_val = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
305 hot = (thresh_val & tsr->threshold_thot_mask) >>
306 __ffs(tsr->threshold_thot_mask);
309 /* change the t_hot to t_cold + 5000 millidegrees */
310 err |= add_hyst(t_cold, ts_data->hyst_val, bg_ptr, id, &hot);
311 /* write the new t_hot value */
312 reg_val = thresh_val & (~tsr->threshold_thot_mask);
313 reg_val |= hot << __ffs(tsr->threshold_thot_mask);
314 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
315 thresh_val = reg_val;
318 /* write the new t_cold value */
319 reg_val = thresh_val & ~tsr->threshold_tcold_mask;
320 reg_val |= (t_cold << __ffs(tsr->threshold_tcold_mask));
321 omap_bandgap_writel(bg_ptr, reg_val, tsr->bgap_threshold);
323 dev_err(bg_ptr->dev, "failed to reprogram tcold threshold\n");
327 return temp_sensor_unmask_interrupts(bg_ptr, id, hot, t_cold);
330 /* This is Tshut Thot config. Call it only if HAS(TSHUT_CONFIG) is set */
331 static int temp_sensor_configure_tshut_hot(struct omap_bandgap *bg_ptr,
332 int id, int tshut_hot)
334 struct temp_sensor_registers *tsr;
337 tsr = bg_ptr->conf->sensors[id].registers;
338 reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
339 reg_val &= ~tsr->tshut_hot_mask;
340 reg_val |= tshut_hot << __ffs(tsr->tshut_hot_mask);
341 omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
346 /* This is Tshut Tcold config. Call it only if HAS(TSHUT_CONFIG) is set */
347 static int temp_sensor_configure_tshut_cold(struct omap_bandgap *bg_ptr,
348 int id, int tshut_cold)
350 struct temp_sensor_registers *tsr;
353 tsr = bg_ptr->conf->sensors[id].registers;
354 reg_val = omap_bandgap_readl(bg_ptr, tsr->tshut_threshold);
355 reg_val &= ~tsr->tshut_cold_mask;
356 reg_val |= tshut_cold << __ffs(tsr->tshut_cold_mask);
357 omap_bandgap_writel(bg_ptr, reg_val, tsr->tshut_threshold);
362 /* This is counter config. Call it only if HAS(COUNTER) is set */
363 static int configure_temp_sensor_counter(struct omap_bandgap *bg_ptr, int id,
366 struct temp_sensor_registers *tsr;
369 tsr = bg_ptr->conf->sensors[id].registers;
370 val = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
371 val &= ~tsr->counter_mask;
372 val |= counter << __ffs(tsr->counter_mask);
373 omap_bandgap_writel(bg_ptr, val, tsr->bgap_counter);
378 #define bandgap_is_valid(b) \
380 #define bandgap_is_valid_sensor_id(b, i) \
381 ((i) >= 0 && (i) < (b)->conf->sensor_count)
382 static inline int omap_bandgap_validate(struct omap_bandgap *bg_ptr, int id)
384 if (!bandgap_is_valid(bg_ptr)) {
385 pr_err("%s: invalid bandgap pointer\n", __func__);
389 if (!bandgap_is_valid_sensor_id(bg_ptr, id)) {
390 dev_err(bg_ptr->dev, "%s: sensor id out of range (%d)\n",
400 * omap_bandgap_read_thot() - reads sensor current thot
401 * @bg_ptr - pointer to bandgap instance
403 * @thot - resulting current thot value
405 * returns 0 on success or the proper error code
407 int omap_bandgap_read_thot(struct omap_bandgap *bg_ptr, int id,
410 struct temp_sensor_registers *tsr;
414 ret = omap_bandgap_validate(bg_ptr, id);
418 if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
421 tsr = bg_ptr->conf->sensors[id].registers;
422 temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
423 temp = (temp & tsr->threshold_thot_mask) >>
424 __ffs(tsr->threshold_thot_mask);
425 ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
427 dev_err(bg_ptr->dev, "failed to read thot\n");
437 * omap_bandgap_write_thot() - sets sensor current thot
438 * @bg_ptr - pointer to bandgap instance
440 * @val - desired thot value
442 * returns 0 on success or the proper error code
444 int omap_bandgap_write_thot(struct omap_bandgap *bg_ptr, int id, int val)
446 struct temp_sensor_data *ts_data;
447 struct temp_sensor_registers *tsr;
451 ret = omap_bandgap_validate(bg_ptr, id);
455 if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
458 ts_data = bg_ptr->conf->sensors[id].ts_data;
459 tsr = bg_ptr->conf->sensors[id].registers;
461 if (val < ts_data->min_temp + ts_data->hyst_val)
463 ret = temp_to_adc_conversion(val, bg_ptr, id, &t_hot);
467 mutex_lock(&bg_ptr->bg_mutex);
468 temp_sensor_configure_thot(bg_ptr, id, t_hot);
469 mutex_unlock(&bg_ptr->bg_mutex);
475 * omap_bandgap_read_tcold() - reads sensor current tcold
476 * @bg_ptr - pointer to bandgap instance
478 * @tcold - resulting current tcold value
480 * returns 0 on success or the proper error code
482 int omap_bandgap_read_tcold(struct omap_bandgap *bg_ptr, int id,
485 struct temp_sensor_registers *tsr;
489 ret = omap_bandgap_validate(bg_ptr, id);
493 if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
496 tsr = bg_ptr->conf->sensors[id].registers;
497 temp = omap_bandgap_readl(bg_ptr, tsr->bgap_threshold);
498 temp = (temp & tsr->threshold_tcold_mask)
499 >> __ffs(tsr->threshold_tcold_mask);
500 ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
510 * omap_bandgap_write_tcold() - sets the sensor tcold
511 * @bg_ptr - pointer to bandgap instance
513 * @val - desired tcold value
515 * returns 0 on success or the proper error code
517 int omap_bandgap_write_tcold(struct omap_bandgap *bg_ptr, int id, int val)
519 struct temp_sensor_data *ts_data;
520 struct temp_sensor_registers *tsr;
524 ret = omap_bandgap_validate(bg_ptr, id);
528 if (!OMAP_BANDGAP_HAS(bg_ptr, TALERT))
531 ts_data = bg_ptr->conf->sensors[id].ts_data;
532 tsr = bg_ptr->conf->sensors[id].registers;
533 if (val > ts_data->max_temp + ts_data->hyst_val)
536 ret = temp_to_adc_conversion(val, bg_ptr, id, &t_cold);
540 mutex_lock(&bg_ptr->bg_mutex);
541 temp_sensor_configure_tcold(bg_ptr, id, t_cold);
542 mutex_unlock(&bg_ptr->bg_mutex);
548 * omap_bandgap_read_update_interval() - read the sensor update interval
549 * @bg_ptr - pointer to bandgap instance
551 * @interval - resulting update interval in miliseconds
553 * returns 0 on success or the proper error code
555 int omap_bandgap_read_update_interval(struct omap_bandgap *bg_ptr, int id,
558 struct temp_sensor_registers *tsr;
562 ret = omap_bandgap_validate(bg_ptr, id);
566 if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
569 tsr = bg_ptr->conf->sensors[id].registers;
570 time = omap_bandgap_readl(bg_ptr, tsr->bgap_counter);
571 time = (time & tsr->counter_mask) >> __ffs(tsr->counter_mask);
572 time = time * 1000 / bg_ptr->clk_rate;
580 * omap_bandgap_write_update_interval() - set the update interval
581 * @bg_ptr - pointer to bandgap instance
583 * @interval - desired update interval in miliseconds
585 * returns 0 on success or the proper error code
587 int omap_bandgap_write_update_interval(struct omap_bandgap *bg_ptr,
588 int id, u32 interval)
590 int ret = omap_bandgap_validate(bg_ptr, id);
594 if (!OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
597 interval = interval * bg_ptr->clk_rate / 1000;
598 mutex_lock(&bg_ptr->bg_mutex);
599 configure_temp_sensor_counter(bg_ptr, id, interval);
600 mutex_unlock(&bg_ptr->bg_mutex);
606 * omap_bandgap_read_temperature() - report current temperature
607 * @bg_ptr - pointer to bandgap instance
609 * @temperature - resulting temperature
611 * returns 0 on success or the proper error code
613 int omap_bandgap_read_temperature(struct omap_bandgap *bg_ptr, int id,
616 struct temp_sensor_registers *tsr;
620 ret = omap_bandgap_validate(bg_ptr, id);
624 tsr = bg_ptr->conf->sensors[id].registers;
625 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
626 temp &= tsr->bgap_dtemp_mask;
628 ret |= adc_to_temp_conversion(bg_ptr, id, temp, &temp);
638 * omap_bandgap_set_sensor_data() - helper function to store thermal
639 * framework related data.
640 * @bg_ptr - pointer to bandgap instance
642 * @data - thermal framework related data to be stored
644 * returns 0 on success or the proper error code
646 int omap_bandgap_set_sensor_data(struct omap_bandgap *bg_ptr, int id,
649 int ret = omap_bandgap_validate(bg_ptr, id);
653 bg_ptr->conf->sensors[id].data = data;
659 * omap_bandgap_get_sensor_data() - helper function to get thermal
660 * framework related data.
661 * @bg_ptr - pointer to bandgap instance
664 * returns data stored by set function with sensor id on success or NULL
666 void *omap_bandgap_get_sensor_data(struct omap_bandgap *bg_ptr, int id)
668 int ret = omap_bandgap_validate(bg_ptr, id);
672 return bg_ptr->conf->sensors[id].data;
676 omap_bandgap_force_single_read(struct omap_bandgap *bg_ptr, int id)
678 struct temp_sensor_registers *tsr;
679 u32 temp = 0, counter = 1000;
681 tsr = bg_ptr->conf->sensors[id].registers;
682 /* Select single conversion mode */
683 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG)) {
684 temp = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
685 temp &= ~(1 << __ffs(tsr->mode_ctrl_mask));
686 omap_bandgap_writel(bg_ptr, temp, tsr->bgap_mode_ctrl);
689 /* Start of Conversion = 1 */
690 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
691 temp |= 1 << __ffs(tsr->bgap_soc_mask);
692 omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
693 /* Wait until DTEMP is updated */
694 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
695 temp &= (tsr->bgap_dtemp_mask);
696 while ((temp == 0) && --counter) {
697 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
698 temp &= (tsr->bgap_dtemp_mask);
700 /* Start of Conversion = 0 */
701 temp = omap_bandgap_readl(bg_ptr, tsr->temp_sensor_ctrl);
702 temp &= ~(1 << __ffs(tsr->bgap_soc_mask));
703 omap_bandgap_writel(bg_ptr, temp, tsr->temp_sensor_ctrl);
709 * enable_continuous_mode() - One time enabling of continuous conversion mode
710 * @bg_ptr - pointer to scm instance
712 * Call this function only if HAS(MODE_CONFIG) is set
714 static int enable_continuous_mode(struct omap_bandgap *bg_ptr)
716 struct temp_sensor_registers *tsr;
720 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
721 /* Perform a single read just before enabling continuous */
722 omap_bandgap_force_single_read(bg_ptr, i);
723 tsr = bg_ptr->conf->sensors[i].registers;
724 val = omap_bandgap_readl(bg_ptr, tsr->bgap_mode_ctrl);
725 val |= 1 << __ffs(tsr->mode_ctrl_mask);
726 omap_bandgap_writel(bg_ptr, val, tsr->bgap_mode_ctrl);
732 static int omap_bandgap_tshut_init(struct omap_bandgap *bg_ptr,
733 struct platform_device *pdev)
735 int gpio_nr = bg_ptr->tshut_gpio;
738 /* Request for gpio_86 line */
739 status = gpio_request(gpio_nr, "tshut");
742 "Could not request for TSHUT GPIO:%i\n", 86);
745 status = gpio_direction_input(gpio_nr);
748 "Cannot set input TSHUT GPIO %d\n", gpio_nr);
752 status = request_irq(gpio_to_irq(gpio_nr),
753 omap_bandgap_tshut_irq_handler,
754 IRQF_TRIGGER_RISING, "tshut",
758 dev_err(bg_ptr->dev, "request irq failed for TSHUT");
764 /* Initialization of Talert. Call it only if HAS(TALERT) is set */
765 static int omap_bandgap_talert_init(struct omap_bandgap *bg_ptr,
766 struct platform_device *pdev)
770 bg_ptr->irq = platform_get_irq(pdev, 0);
771 if (bg_ptr->irq < 0) {
772 dev_err(&pdev->dev, "get_irq failed\n");
775 ret = request_threaded_irq(bg_ptr->irq, NULL,
777 IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
780 dev_err(&pdev->dev, "Request threaded irq failed.\n");
787 static const struct of_device_id of_omap_bandgap_match[];
788 static struct omap_bandgap *omap_bandgap_build(struct platform_device *pdev)
790 struct device_node *node = pdev->dev.of_node;
791 const struct of_device_id *of_id;
792 struct omap_bandgap *bg_ptr;
793 struct resource *res;
797 /* just for the sake */
799 dev_err(&pdev->dev, "no platform information available\n");
800 return ERR_PTR(-EINVAL);
803 bg_ptr = devm_kzalloc(&pdev->dev, sizeof(struct omap_bandgap),
806 dev_err(&pdev->dev, "Unable to allocate mem for driver ref\n");
807 return ERR_PTR(-ENOMEM);
810 of_id = of_match_device(of_omap_bandgap_match, &pdev->dev);
812 bg_ptr->conf = of_id->data;
818 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
821 chunk = devm_ioremap_resource(&pdev->dev, res);
823 bg_ptr->base = chunk;
825 return ERR_CAST(chunk);
830 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
831 if (of_property_read_u32(node, "ti,tshut-gpio", &prop) < 0) {
832 dev_err(&pdev->dev, "missing tshut gpio in device tree\n");
833 return ERR_PTR(-EINVAL);
835 bg_ptr->tshut_gpio = prop;
836 if (!gpio_is_valid(bg_ptr->tshut_gpio)) {
837 dev_err(&pdev->dev, "invalid gpio for tshut (%d)\n",
839 return ERR_PTR(-EINVAL);
847 int omap_bandgap_probe(struct platform_device *pdev)
849 struct omap_bandgap *bg_ptr;
850 int clk_rate, ret = 0, i;
852 bg_ptr = omap_bandgap_build(pdev);
853 if (IS_ERR_OR_NULL(bg_ptr)) {
854 dev_err(&pdev->dev, "failed to fetch platform data\n");
855 return PTR_ERR(bg_ptr);
857 bg_ptr->dev = &pdev->dev;
859 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
860 ret = omap_bandgap_tshut_init(bg_ptr, pdev);
863 "failed to initialize system tshut IRQ\n");
868 bg_ptr->fclock = clk_get(NULL, bg_ptr->conf->fclock_name);
869 ret = IS_ERR_OR_NULL(bg_ptr->fclock);
871 dev_err(&pdev->dev, "failed to request fclock reference\n");
875 bg_ptr->div_clk = clk_get(NULL, bg_ptr->conf->div_ck_name);
876 ret = IS_ERR_OR_NULL(bg_ptr->div_clk);
879 "failed to request div_ts_ck clock ref\n");
883 bg_ptr->conv_table = bg_ptr->conf->conv_table;
884 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
885 struct temp_sensor_registers *tsr;
888 tsr = bg_ptr->conf->sensors[i].registers;
890 * check if the efuse has a non-zero value if not
891 * it is an untrimmed sample and the temperatures
892 * may not be accurate
894 val = omap_bandgap_readl(bg_ptr, tsr->bgap_efuse);
897 "Non-trimmed BGAP, Temp not accurate\n");
900 clk_rate = clk_round_rate(bg_ptr->div_clk,
901 bg_ptr->conf->sensors[0].ts_data->max_freq);
902 if (clk_rate < bg_ptr->conf->sensors[0].ts_data->min_freq ||
903 clk_rate == 0xffffffff) {
905 dev_err(&pdev->dev, "wrong clock rate (%d)\n", clk_rate);
909 ret = clk_set_rate(bg_ptr->div_clk, clk_rate);
911 dev_err(&pdev->dev, "Cannot re-set clock rate. Continuing\n");
913 bg_ptr->clk_rate = clk_rate;
914 clk_enable(bg_ptr->fclock);
916 mutex_init(&bg_ptr->bg_mutex);
917 bg_ptr->dev = &pdev->dev;
918 platform_set_drvdata(pdev, bg_ptr);
920 omap_bandgap_power(bg_ptr, true);
922 /* Set default counter to 1 for now */
923 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
924 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
925 configure_temp_sensor_counter(bg_ptr, i, 1);
927 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
928 struct temp_sensor_data *ts_data;
930 ts_data = bg_ptr->conf->sensors[i].ts_data;
932 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
933 temp_sensor_init_talert_thresholds(bg_ptr, i,
936 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG)) {
937 temp_sensor_configure_tshut_hot(bg_ptr, i,
939 temp_sensor_configure_tshut_cold(bg_ptr, i,
940 ts_data->tshut_cold);
944 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
945 enable_continuous_mode(bg_ptr);
947 /* Set .250 seconds time as default counter */
948 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
949 for (i = 0; i < bg_ptr->conf->sensor_count; i++)
950 configure_temp_sensor_counter(bg_ptr, i,
951 bg_ptr->clk_rate / 4);
953 /* Every thing is good? Then expose the sensors */
954 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
957 if (bg_ptr->conf->sensors[i].register_cooling)
958 bg_ptr->conf->sensors[i].register_cooling(bg_ptr, i);
960 domain = bg_ptr->conf->sensors[i].domain;
961 if (bg_ptr->conf->expose_sensor)
962 bg_ptr->conf->expose_sensor(bg_ptr, i, domain);
966 * Enable the Interrupts once everything is set. Otherwise irq handler
967 * might be called as soon as it is enabled where as rest of framework
968 * is still getting initialised.
970 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
971 ret = omap_bandgap_talert_init(bg_ptr, pdev);
973 dev_err(&pdev->dev, "failed to initialize Talert IRQ\n");
974 i = bg_ptr->conf->sensor_count;
982 clk_disable(bg_ptr->fclock);
984 clk_put(bg_ptr->fclock);
985 clk_put(bg_ptr->div_clk);
987 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
988 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
989 gpio_free(bg_ptr->tshut_gpio);
996 int omap_bandgap_remove(struct platform_device *pdev)
998 struct omap_bandgap *bg_ptr = platform_get_drvdata(pdev);
1001 /* First thing is to remove sensor interfaces */
1002 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1003 if (bg_ptr->conf->sensors[i].register_cooling)
1004 bg_ptr->conf->sensors[i].unregister_cooling(bg_ptr, i);
1006 if (bg_ptr->conf->remove_sensor)
1007 bg_ptr->conf->remove_sensor(bg_ptr, i);
1010 omap_bandgap_power(bg_ptr, false);
1012 clk_disable(bg_ptr->fclock);
1013 clk_put(bg_ptr->fclock);
1014 clk_put(bg_ptr->div_clk);
1016 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT))
1017 free_irq(bg_ptr->irq, bg_ptr);
1019 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT)) {
1020 free_irq(gpio_to_irq(bg_ptr->tshut_gpio), NULL);
1021 gpio_free(bg_ptr->tshut_gpio);
1028 static int omap_bandgap_save_ctxt(struct omap_bandgap *bg_ptr)
1032 for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
1033 struct temp_sensor_registers *tsr;
1034 struct temp_sensor_regval *rval;
1036 rval = &bg_ptr->conf->sensors[i].regval;
1037 tsr = bg_ptr->conf->sensors[i].registers;
1039 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1040 rval->bg_mode_ctrl = omap_bandgap_readl(bg_ptr,
1041 tsr->bgap_mode_ctrl);
1042 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1043 rval->bg_counter = omap_bandgap_readl(bg_ptr,
1045 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1046 rval->bg_threshold = omap_bandgap_readl(bg_ptr,
1047 tsr->bgap_threshold);
1048 rval->bg_ctrl = omap_bandgap_readl(bg_ptr,
1049 tsr->bgap_mask_ctrl);
1052 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1053 rval->tshut_threshold = omap_bandgap_readl(bg_ptr,
1054 tsr->tshut_threshold);
1060 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);
1075 if (OMAP_BANDGAP_HAS(bg_ptr, TSHUT_CONFIG))
1076 omap_bandgap_writel(bg_ptr,
1077 rval->tshut_threshold,
1078 tsr->tshut_threshold);
1079 /* Force immediate temperature measurement and update
1080 * of the DTEMP field
1082 omap_bandgap_force_single_read(bg_ptr, i);
1084 if (OMAP_BANDGAP_HAS(bg_ptr, COUNTER))
1085 omap_bandgap_writel(bg_ptr, rval->bg_counter,
1087 if (OMAP_BANDGAP_HAS(bg_ptr, MODE_CONFIG))
1088 omap_bandgap_writel(bg_ptr, rval->bg_mode_ctrl,
1089 tsr->bgap_mode_ctrl);
1090 if (OMAP_BANDGAP_HAS(bg_ptr, TALERT)) {
1091 omap_bandgap_writel(bg_ptr,
1093 tsr->bgap_threshold);
1094 omap_bandgap_writel(bg_ptr, rval->bg_ctrl,
1095 tsr->bgap_mask_ctrl);
1102 static int omap_bandgap_suspend(struct device *dev)
1104 struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1107 err = omap_bandgap_save_ctxt(bg_ptr);
1108 omap_bandgap_power(bg_ptr, false);
1109 clk_disable(bg_ptr->fclock);
1114 static int omap_bandgap_resume(struct device *dev)
1116 struct omap_bandgap *bg_ptr = dev_get_drvdata(dev);
1118 clk_enable(bg_ptr->fclock);
1119 omap_bandgap_power(bg_ptr, true);
1121 return omap_bandgap_restore_ctxt(bg_ptr);
1123 static const struct dev_pm_ops omap_bandgap_dev_pm_ops = {
1124 SET_SYSTEM_SLEEP_PM_OPS(omap_bandgap_suspend,
1125 omap_bandgap_resume)
1128 #define DEV_PM_OPS (&omap_bandgap_dev_pm_ops)
1130 #define DEV_PM_OPS NULL
1133 static const struct of_device_id of_omap_bandgap_match[] = {
1134 #ifdef CONFIG_OMAP4_THERMAL
1136 .compatible = "ti,omap4430-bandgap",
1137 .data = (void *)&omap4430_data,
1140 .compatible = "ti,omap4460-bandgap",
1141 .data = (void *)&omap4460_data,
1144 .compatible = "ti,omap4470-bandgap",
1145 .data = (void *)&omap4470_data,
1148 #ifdef CONFIG_OMAP5_THERMAL
1150 .compatible = "ti,omap5430-bandgap",
1151 .data = (void *)&omap5430_data,
1157 MODULE_DEVICE_TABLE(of, of_omap_bandgap_match);
1159 static struct platform_driver omap_bandgap_sensor_driver = {
1160 .probe = omap_bandgap_probe,
1161 .remove = omap_bandgap_remove,
1163 .name = "omap-bandgap",
1165 .of_match_table = of_omap_bandgap_match,
1169 module_platform_driver(omap_bandgap_sensor_driver);
1171 MODULE_DESCRIPTION("OMAP4+ bandgap temperature sensor driver");
1172 MODULE_LICENSE("GPL v2");
1173 MODULE_ALIAS("platform:omap-bandgap");
1174 MODULE_AUTHOR("Texas Instrument Inc.");