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hwrng: iproc-rng200 - Implement suspend and resume calls

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Chips such as BCM7278 support system wide suspend/resume which will
cause the HWRNG block to lose its state and reset to its power on reset
register values. We need to cleanup and re-initialize the HWRNG for it
to be functional coming out of a system suspend cycle.

Fixes: c3577f6100 ("hwrng: iproc-rng200 - Add support for BCM7278")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Florian Fainelli 2023-08-10 12:22:08 -07:00 committed by Herbert Xu
parent d88bdbd96d
commit 8e03dd62e5
1 changed files with 25 additions and 0 deletions
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25
drivers/char/hw_random/iproc-rng200.c
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@ -181,6 +181,8 @@ static int iproc_rng200_probe(struct platform_device *pdev)
return PTR_ERR(priv->base);
}
dev_set_drvdata(dev, priv);
priv->rng.name = "iproc-rng200";
priv->rng.read = iproc_rng200_read;
priv->rng.init = iproc_rng200_init;
@ -198,6 +200,28 @@ static int iproc_rng200_probe(struct platform_device *pdev)
return 0;
}
static int __maybe_unused iproc_rng200_suspend(struct device *dev)
{
struct iproc_rng200_dev *priv = dev_get_drvdata(dev);
iproc_rng200_cleanup(&priv->rng);
return 0;
}
static int __maybe_unused iproc_rng200_resume(struct device *dev)
{
struct iproc_rng200_dev *priv = dev_get_drvdata(dev);
iproc_rng200_init(&priv->rng);
return 0;
}
static const struct dev_pm_ops iproc_rng200_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(iproc_rng200_suspend, iproc_rng200_resume)
};
static const struct of_device_id iproc_rng200_of_match[] = {
{ .compatible = "brcm,bcm2711-rng200", },
{ .compatible = "brcm,bcm7211-rng200", },
@ -211,6 +235,7 @@ static struct platform_driver iproc_rng200_driver = {
.driver = {
.name = "iproc-rng200",
.of_match_table = iproc_rng200_of_match,
.pm = &iproc_rng200_pm_ops,
},
.probe = iproc_rng200_probe,
};