Commit c4f51eab authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Herbert Xu
Browse files

hwrng: atmel - add runtime pm support 



Add runtime PM support.

Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent b9531885

drivers/char/hw_random/atmel-rng.c

+32 −12
Original line number Diff line number Diff line
@@ -17,6 +17,7 @@ 
#include <linux/hw_random.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>



#define TRNG_CR		0x00

#define TRNG_MR		0x04
@@ -58,6 +59,12 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max, 
	u32 *data = buf;

	int ret;



	ret = pm_runtime_get_sync((struct device *)trng->rng.priv);

	if (ret < 0) {

		pm_runtime_put_sync((struct device *)trng->rng.priv);

		return ret;

	}



	ret = atmel_trng_wait_ready(trng, wait);

	if (!ret)

		goto out;
@@ -72,6 +79,8 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max, 
	ret = 4;



out:

	pm_runtime_mark_last_busy((struct device *)trng->rng.priv);

	pm_runtime_put_sync_autosuspend((struct device *)trng->rng.priv);

	return ret;

}
@@ -127,21 +136,28 @@ static int atmel_trng_probe(struct platform_device *pdev) 
	trng->has_half_rate = data->has_half_rate;

	trng->rng.name = pdev->name;

	trng->rng.read = atmel_trng_read;

	trng->rng.priv = (unsigned long)&pdev->dev;

	platform_set_drvdata(pdev, trng);



#ifndef CONFIG_PM

	ret = atmel_trng_init(trng);

	if (ret)

		return ret;

#endif



	ret = devm_hwrng_register(&pdev->dev, &trng->rng);

	if (ret)

		goto err_register;

	pm_runtime_set_autosuspend_delay(&pdev->dev, 100);

	pm_runtime_use_autosuspend(&pdev->dev);

	pm_runtime_enable(&pdev->dev);



	platform_set_drvdata(pdev, trng);



	return 0;



err_register:

	ret = devm_hwrng_register(&pdev->dev, &trng->rng);

	if (ret) {

		pm_runtime_disable(&pdev->dev);

		pm_runtime_set_suspended(&pdev->dev);

#ifndef CONFIG_PM

		atmel_trng_cleanup(trng);

#endif

	}



	return ret;

}
@@ -151,11 +167,13 @@ static int atmel_trng_remove(struct platform_device *pdev) 




	atmel_trng_cleanup(trng);

	pm_runtime_disable(&pdev->dev);

	pm_runtime_set_suspended(&pdev->dev);



	return 0;

}



static int __maybe_unused atmel_trng_suspend(struct device *dev)

static int __maybe_unused atmel_trng_runtime_suspend(struct device *dev)

{

	struct atmel_trng *trng = dev_get_drvdata(dev);
@@ -164,7 +182,7 @@ static int __maybe_unused atmel_trng_suspend(struct device *dev) 
	return 0;

}



static int __maybe_unused atmel_trng_resume(struct device *dev)

static int __maybe_unused atmel_trng_runtime_resume(struct device *dev)

{

	struct atmel_trng *trng = dev_get_drvdata(dev);
@@ -172,8 +190,10 @@ static int __maybe_unused atmel_trng_resume(struct device *dev) 
}



static const struct dev_pm_ops __maybe_unused atmel_trng_pm_ops = {

	.suspend	= atmel_trng_suspend,

	.resume		= atmel_trng_resume,

	SET_RUNTIME_PM_OPS(atmel_trng_runtime_suspend,

			   atmel_trng_runtime_resume, NULL)

	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,

				pm_runtime_force_resume)

};



static const struct atmel_trng_data at91sam9g45_config = {