12  *   This file is the core OMAP support for the generic, Linux
13  *   PWM driver / controller, using the OMAP's dual-mode timers
29  * - PWM OMAP DM timer cannot change the polarity when pwm is active. When
44 #include <linux/platform_data/dmtimer-omap.h>
56  *				  corresponding to omap dmtimer.
59  * @dm_timer:		Pointer to omap dm timer.
60  * @pdata:		Pointer to omap dm timer ops.
61  * @dm_timer_pdev:	Pointer to omap dm timer platform device
91  * pwm_omap_dmtimer_start() - Start the pwm omap dm timer in pwm mode
92  * @omap:	Pointer to pwm omap dm timer chip
94 static void pwm_omap_dmtimer_start(struct pwm_omap_dmtimer_chip *omap)  in pwm_omap_dmtimer_start()  argument
97 	 * According to OMAP 4 TRM section 22.2.4.10 the counter should be  in pwm_omap_dmtimer_start()
104 	omap->pdata->enable(omap->dm_timer);  in pwm_omap_dmtimer_start()
105 	omap->pdata->write_counter(omap->dm_timer, DM_TIMER_LOAD_MIN);  in pwm_omap_dmtimer_start()
106 	omap->pdata->disable(omap->dm_timer);  in pwm_omap_dmtimer_start()
108 	omap->pdata->start(omap->dm_timer);  in pwm_omap_dmtimer_start()
113  * @omap:	Pointer to pwm omap dm timer chip
117 static bool pwm_omap_dmtimer_is_enabled(struct pwm_omap_dmtimer_chip *omap)  in pwm_omap_dmtimer_is_enabled()  argument
121 	status = omap->pdata->get_pwm_status(omap->dm_timer);  in pwm_omap_dmtimer_is_enabled()
128  * @omap:	Pointer to pwm omap dm timer chip
132 static int pwm_omap_dmtimer_polarity(struct pwm_omap_dmtimer_chip *omap)  in pwm_omap_dmtimer_polarity()  argument
136 	status = omap->pdata->get_pwm_status(omap->dm_timer);  in pwm_omap_dmtimer_polarity()
142  * pwm_omap_dmtimer_config() - Update the configuration of pwm omap dm timer
155 	struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);  in pwm_omap_dmtimer_config()  local
168 	fclk = omap->pdata->get_fclk(omap->dm_timer);  in pwm_omap_dmtimer_config()
231 	omap->pdata->set_load(omap->dm_timer, load_value);  in pwm_omap_dmtimer_config()
232 	omap->pdata->set_match(omap->dm_timer, true, match_value);  in pwm_omap_dmtimer_config()
250 	struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);  in pwm_omap_dmtimer_set_polarity()  local
254 	enabled = pwm_omap_dmtimer_is_enabled(omap);  in pwm_omap_dmtimer_set_polarity()
256 		omap->pdata->stop(omap->dm_timer);  in pwm_omap_dmtimer_set_polarity()
258 	omap->pdata->set_pwm(omap->dm_timer,  in pwm_omap_dmtimer_set_polarity()
264 		pwm_omap_dmtimer_start(omap);  in pwm_omap_dmtimer_set_polarity()
268  * pwm_omap_dmtimer_apply() - Changes the state of the pwm omap dm timer.
279 	struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);  in pwm_omap_dmtimer_apply()  local
282 	mutex_lock(&omap->mutex);  in pwm_omap_dmtimer_apply()
284 	if (pwm_omap_dmtimer_is_enabled(omap) && !state->enabled) {  in pwm_omap_dmtimer_apply()
285 		omap->pdata->stop(omap->dm_timer);  in pwm_omap_dmtimer_apply()
289 	if (pwm_omap_dmtimer_polarity(omap) != state->polarity)  in pwm_omap_dmtimer_apply()
297 	if (!pwm_omap_dmtimer_is_enabled(omap) && state->enabled) {  in pwm_omap_dmtimer_apply()
298 		omap->pdata->set_pwm(omap->dm_timer,  in pwm_omap_dmtimer_apply()
303 		pwm_omap_dmtimer_start(omap);  in pwm_omap_dmtimer_apply()
307 	mutex_unlock(&omap->mutex);  in pwm_omap_dmtimer_apply()
323 	struct pwm_omap_dmtimer_chip *omap;  in pwm_omap_dmtimer_probe()  local
380 	omap = devm_kzalloc(&pdev->dev, sizeof(*omap), GFP_KERNEL);  in pwm_omap_dmtimer_probe()
381 	if (!omap) {  in pwm_omap_dmtimer_probe()
386 	omap->pdata = pdata;  in pwm_omap_dmtimer_probe()
387 	omap->dm_timer = dm_timer;  in pwm_omap_dmtimer_probe()
388 	omap->dm_timer_pdev = timer_pdev;  in pwm_omap_dmtimer_probe()
394 	if (pm_runtime_active(&omap->dm_timer_pdev->dev))  in pwm_omap_dmtimer_probe()
395 		omap->pdata->stop(omap->dm_timer);  in pwm_omap_dmtimer_probe()
398 		omap->pdata->set_prescaler(omap->dm_timer, v);  in pwm_omap_dmtimer_probe()
402 		omap->pdata->set_source(omap->dm_timer, v);  in pwm_omap_dmtimer_probe()
404 	omap->chip.dev = &pdev->dev;  in pwm_omap_dmtimer_probe()
405 	omap->chip.ops = &pwm_omap_dmtimer_ops;  in pwm_omap_dmtimer_probe()
406 	omap->chip.npwm = 1;  in pwm_omap_dmtimer_probe()
408 	mutex_init(&omap->mutex);  in pwm_omap_dmtimer_probe()
410 	ret = pwmchip_add(&omap->chip);  in pwm_omap_dmtimer_probe()
418 	platform_set_drvdata(pdev, omap);  in pwm_omap_dmtimer_probe()
425 	 * *omap is allocated using devm_kzalloc,  in pwm_omap_dmtimer_probe()
446 	struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev);  in pwm_omap_dmtimer_remove()  local
448 	pwmchip_remove(&omap->chip);  in pwm_omap_dmtimer_remove()
450 	if (pm_runtime_active(&omap->dm_timer_pdev->dev))  in pwm_omap_dmtimer_remove()
451 		omap->pdata->stop(omap->dm_timer);  in pwm_omap_dmtimer_remove()
453 	omap->pdata->free(omap->dm_timer);  in pwm_omap_dmtimer_remove()
455 	put_device(&omap->dm_timer_pdev->dev);  in pwm_omap_dmtimer_remove()
457 	mutex_destroy(&omap->mutex);  in pwm_omap_dmtimer_remove()
463 	{.compatible = "ti,omap-dmtimer-pwm"},
470 		.name = "omap-dmtimer-pwm",
482 MODULE_DESCRIPTION("OMAP PWM Driver using Dual-mode Timers");