From 2d2574b4055f86f2fac57c6322e6487f15524baf Mon Sep 17 00:00:00 2001 From: Gatien Chevallier Date: Tue, 19 Sep 2023 17:27:55 +0200 Subject: [PATCH] rng: stm32: Implement configurable RNG clock error detection RNG clock error detection is now enabled if the "clock-error-detect" property is set in the device tree. Signed-off-by: Gatien Chevallier Reviewed-by: Patrick Delaunay Reviewed-by: Patrice Chotard --- drivers/rng/stm32_rng.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/drivers/rng/stm32_rng.c b/drivers/rng/stm32_rng.c index 89da78c6c8..ada5d92214 100644 --- a/drivers/rng/stm32_rng.c +++ b/drivers/rng/stm32_rng.c @@ -40,6 +40,7 @@ struct stm32_rng_plat { struct clk clk; struct reset_ctl rst; const struct stm32_rng_data *data; + bool ced; }; static int stm32_rng_read(struct udevice *dev, void *data, size_t len) @@ -97,25 +98,34 @@ static int stm32_rng_init(struct stm32_rng_plat *pdata) cr = readl(pdata->base + RNG_CR); - /* Disable CED */ - cr |= RNG_CR_CED; if (pdata->data->has_cond_reset) { cr |= RNG_CR_CONDRST; + if (pdata->ced) + cr &= ~RNG_CR_CED; + else + cr |= RNG_CR_CED; writel(cr, pdata->base + RNG_CR); cr &= ~RNG_CR_CONDRST; + cr |= RNG_CR_RNGEN; writel(cr, pdata->base + RNG_CR); err = readl_poll_timeout(pdata->base + RNG_CR, cr, (!(cr & RNG_CR_CONDRST)), 10000); if (err) return err; + } else { + if (pdata->ced) + cr &= ~RNG_CR_CED; + else + cr |= RNG_CR_CED; + + cr |= RNG_CR_RNGEN; + + writel(cr, pdata->base + RNG_CR); } /* clear error indicators */ writel(0, pdata->base + RNG_SR); - cr |= RNG_CR_RNGEN; - writel(cr, pdata->base + RNG_CR); - err = readl_poll_timeout(pdata->base + RNG_SR, sr, sr & RNG_SR_DRDY, 10000); return err; @@ -165,6 +175,8 @@ static int stm32_rng_of_to_plat(struct udevice *dev) if (err) return err; + pdata->ced = dev_read_bool(dev, "clock-error-detect"); + return 0; } -- 2.39.5