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.");