* [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block.
@ 2020-12-14 16:04 ` matthias.bgg
0 siblings, 0 replies; 14+ messages in thread
From: matthias.bgg @ 2020-12-14 16:04 UTC (permalink / raw)
To: mpm, herbert, rjui, sbranden, f.fainelli
Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list,
linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger
From: Matthias Brugger <mbrugger@suse.com>
When trying to disable the block we bitwise or the control
register with value zero. This will leave the block always turned on.
Fix this by setting the corresponding bit to zero.
Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver")
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
drivers/char/hw_random/iproc-rng200.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c
index 01583faf9893..e106ce3c0146 100644
--- a/drivers/char/hw_random/iproc-rng200.c
+++ b/drivers/char/hw_random/iproc-rng200.c
@@ -28,7 +28,6 @@
#define RNG_CTRL_OFFSET 0x00
#define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF
#define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001
-#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000
#define RNG_SOFT_RESET_OFFSET 0x04
#define RNG_SOFT_RESET 0x00000001
@@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base)
/* Disable RBG */
val = ioread32(rng_base + RNG_CTRL_OFFSET);
val &= ~RNG_CTRL_RNG_RBGEN_MASK;
- val |= RNG_CTRL_RNG_RBGEN_DISABLE;
+ val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
iowrite32(val, rng_base + RNG_CTRL_OFFSET);
/* Clear all interrupt status */
@@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng)
/* Disable RNG hardware */
val = ioread32(priv->base + RNG_CTRL_OFFSET);
val &= ~RNG_CTRL_RNG_RBGEN_MASK;
- val |= RNG_CTRL_RNG_RBGEN_DISABLE;
+ val &= ~RNG_CTRL_RNG_RBGEN_ENABLE;
iowrite32(val, priv->base + RNG_CTRL_OFFSET);
}
--
2.29.2
^ permalink raw reply related [flat|nested] 14+ messages in thread* [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. @ 2020-12-14 16:04 ` matthias.bgg 0 siblings, 0 replies; 14+ messages in thread From: matthias.bgg @ 2020-12-14 16:04 UTC (permalink / raw) To: mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto From: Matthias Brugger <mbrugger@suse.com> When trying to disable the block we bitwise or the control register with value zero. This will leave the block always turned on. Fix this by setting the corresponding bit to zero. Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") Signed-off-by: Matthias Brugger <mbrugger@suse.com> --- drivers/char/hw_random/iproc-rng200.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index 01583faf9893..e106ce3c0146 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -28,7 +28,6 @@ #define RNG_CTRL_OFFSET 0x00 #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 #define RNG_SOFT_RESET_OFFSET 0x04 #define RNG_SOFT_RESET 0x00000001 @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) /* Disable RBG */ val = ioread32(rng_base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_DISABLE; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, rng_base + RNG_CTRL_OFFSET); /* Clear all interrupt status */ @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) /* Disable RNG hardware */ val = ioread32(priv->base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_DISABLE; + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; iowrite32(val, priv->base + RNG_CTRL_OFFSET); } -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function 2020-12-14 16:04 ` matthias.bgg @ 2020-12-14 16:04 ` matthias.bgg -1 siblings, 0 replies; 14+ messages in thread From: matthias.bgg @ 2020-12-14 16:04 UTC (permalink / raw) To: mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger From: Matthias Brugger <mbrugger@suse.com> We are calling the same code for enable and disable the block in various parts of the driver. Put that code into a new function to reduce code duplication. Signed-off-by: Matthias Brugger <mbrugger@suse.com> --- drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- 1 file changed, 17 insertions(+), 20 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index e106ce3c0146..3367b26085e8 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -53,15 +53,26 @@ struct iproc_rng200_dev { #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) -static void iproc_rng200_restart(void __iomem *rng_base) +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) { uint32_t val; - /* Disable RBG */ val = ioread32(rng_base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + + if (enable) + val |= RNG_CTRL_RNG_RBGEN_ENABLE; + else + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + iowrite32(val, rng_base + RNG_CTRL_OFFSET); +} + +static void iproc_rng200_restart(void __iomem *rng_base) +{ + uint32_t val; + + iproc_rng200_enable(rng_base, false); /* Clear all interrupt status */ iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET); @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) val &= ~RBG_SOFT_RESET; iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET); - /* Enable RBG */ - val = ioread32(rng_base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, rng_base + RNG_CTRL_OFFSET); + iproc_rng200_enable(rng_base, true); } static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, static int iproc_rng200_init(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Setup RNG. */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, true); return 0; } @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng) static void iproc_rng200_cleanup(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Disable RNG hardware */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, false); } static int iproc_rng200_probe(struct platform_device *pdev) -- 2.29.2 ^ permalink raw reply related [flat|nested] 14+ messages in thread
* [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function @ 2020-12-14 16:04 ` matthias.bgg 0 siblings, 0 replies; 14+ messages in thread From: matthias.bgg @ 2020-12-14 16:04 UTC (permalink / raw) To: mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto From: Matthias Brugger <mbrugger@suse.com> We are calling the same code for enable and disable the block in various parts of the driver. Put that code into a new function to reduce code duplication. Signed-off-by: Matthias Brugger <mbrugger@suse.com> --- drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- 1 file changed, 17 insertions(+), 20 deletions(-) diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c index e106ce3c0146..3367b26085e8 100644 --- a/drivers/char/hw_random/iproc-rng200.c +++ b/drivers/char/hw_random/iproc-rng200.c @@ -53,15 +53,26 @@ struct iproc_rng200_dev { #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) -static void iproc_rng200_restart(void __iomem *rng_base) +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) { uint32_t val; - /* Disable RBG */ val = ioread32(rng_base + RNG_CTRL_OFFSET); val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + + if (enable) + val |= RNG_CTRL_RNG_RBGEN_ENABLE; + else + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; + iowrite32(val, rng_base + RNG_CTRL_OFFSET); +} + +static void iproc_rng200_restart(void __iomem *rng_base) +{ + uint32_t val; + + iproc_rng200_enable(rng_base, false); /* Clear all interrupt status */ iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET); @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) val &= ~RBG_SOFT_RESET; iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET); - /* Enable RBG */ - val = ioread32(rng_base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, rng_base + RNG_CTRL_OFFSET); + iproc_rng200_enable(rng_base, true); } static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, static int iproc_rng200_init(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Setup RNG. */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val |= RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, true); return 0; } @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng) static void iproc_rng200_cleanup(struct hwrng *rng) { struct iproc_rng200_dev *priv = to_rng_priv(rng); - uint32_t val; - /* Disable RNG hardware */ - val = ioread32(priv->base + RNG_CTRL_OFFSET); - val &= ~RNG_CTRL_RNG_RBGEN_MASK; - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; - iowrite32(val, priv->base + RNG_CTRL_OFFSET); + iproc_rng200_enable(priv->base, false); } static int iproc_rng200_probe(struct platform_device *pdev) -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 14+ messages in thread
* Re: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function 2020-12-14 16:04 ` matthias.bgg @ 2020-12-14 17:39 ` Florian Fainelli -1 siblings, 0 replies; 14+ messages in thread From: Florian Fainelli @ 2020-12-14 17:39 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger On 12/14/20 8:04 AM, matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > We are calling the same code for enable and disable the block in various > parts of the driver. Put that code into a new function to reduce code > duplication. > > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > > --- > > drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- > 1 file changed, 17 insertions(+), 20 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index e106ce3c0146..3367b26085e8 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -53,15 +53,26 @@ struct iproc_rng200_dev { > > #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) > > -static void iproc_rng200_restart(void __iomem *rng_base) > +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) I would prefer naming the function iproc_rng200_enable_set() to indicate that it sets the enable to the parameter value, this is just personal taste, you may discard it. > { > uint32_t val; Since you are refactoring this into a new function, do you mind changing the variable to u32 to match the kernel code? With that fixed: Acked-by: Florian Fainelli <f.fainelli@gmail.com> Thanks! -- Florian ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function @ 2020-12-14 17:39 ` Florian Fainelli 0 siblings, 0 replies; 14+ messages in thread From: Florian Fainelli @ 2020-12-14 17:39 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 12/14/20 8:04 AM, matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > We are calling the same code for enable and disable the block in various > parts of the driver. Put that code into a new function to reduce code > duplication. > > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > > --- > > drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- > 1 file changed, 17 insertions(+), 20 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index e106ce3c0146..3367b26085e8 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -53,15 +53,26 @@ struct iproc_rng200_dev { > > #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) > > -static void iproc_rng200_restart(void __iomem *rng_base) > +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) I would prefer naming the function iproc_rng200_enable_set() to indicate that it sets the enable to the parameter value, this is just personal taste, you may discard it. > { > uint32_t val; Since you are refactoring this into a new function, do you mind changing the variable to u32 to match the kernel code? With that fixed: Acked-by: Florian Fainelli <f.fainelli@gmail.com> Thanks! -- Florian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function 2020-12-14 16:04 ` matthias.bgg @ 2020-12-14 17:50 ` Scott Branden -1 siblings, 0 replies; 14+ messages in thread From: Scott Branden @ 2020-12-14 17:50 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > We are calling the same code for enable and disable the block in various > parts of the driver. Put that code into a new function to reduce code > duplication. Patch needs to be regenerated after most of PATCH 1 dropped. > > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > > --- > > drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- > 1 file changed, 17 insertions(+), 20 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index e106ce3c0146..3367b26085e8 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -53,15 +53,26 @@ struct iproc_rng200_dev { > > #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) > > -static void iproc_rng200_restart(void __iomem *rng_base) > +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) > { > uint32_t val; > > - /* Disable RBG */ > val = ioread32(rng_base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > + > + if (enable) > + val |= RNG_CTRL_RNG_RBGEN_ENABLE; > + else > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > + > iowrite32(val, rng_base + RNG_CTRL_OFFSET); > +} > + > +static void iproc_rng200_restart(void __iomem *rng_base) > +{ > + uint32_t val; > + > + iproc_rng200_enable(rng_base, false); > > /* Clear all interrupt status */ > iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET); > @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) > val &= ~RBG_SOFT_RESET; > iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET); > > - /* Enable RBG */ > - val = ioread32(rng_base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, rng_base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(rng_base, true); > } > > static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, > @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, > static int iproc_rng200_init(struct hwrng *rng) > { > struct iproc_rng200_dev *priv = to_rng_priv(rng); > - uint32_t val; > > - /* Setup RNG. */ > - val = ioread32(priv->base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, priv->base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(priv->base, true); > > return 0; > } > @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng) > static void iproc_rng200_cleanup(struct hwrng *rng) > { > struct iproc_rng200_dev *priv = to_rng_priv(rng); > - uint32_t val; > > - /* Disable RNG hardware */ > - val = ioread32(priv->base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, priv->base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(priv->base, false); > } > > static int iproc_rng200_probe(struct platform_device *pdev) ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function @ 2020-12-14 17:50 ` Scott Branden 0 siblings, 0 replies; 14+ messages in thread From: Scott Branden @ 2020-12-14 17:50 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > We are calling the same code for enable and disable the block in various > parts of the driver. Put that code into a new function to reduce code > duplication. Patch needs to be regenerated after most of PATCH 1 dropped. > > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > > --- > > drivers/char/hw_random/iproc-rng200.c | 37 ++++++++++++--------------- > 1 file changed, 17 insertions(+), 20 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index e106ce3c0146..3367b26085e8 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -53,15 +53,26 @@ struct iproc_rng200_dev { > > #define to_rng_priv(rng) container_of(rng, struct iproc_rng200_dev, rng) > > -static void iproc_rng200_restart(void __iomem *rng_base) > +static void iproc_rng200_enable(void __iomem *rng_base, bool enable) > { > uint32_t val; > > - /* Disable RBG */ > val = ioread32(rng_base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > + > + if (enable) > + val |= RNG_CTRL_RNG_RBGEN_ENABLE; > + else > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > + > iowrite32(val, rng_base + RNG_CTRL_OFFSET); > +} > + > +static void iproc_rng200_restart(void __iomem *rng_base) > +{ > + uint32_t val; > + > + iproc_rng200_enable(rng_base, false); > > /* Clear all interrupt status */ > iowrite32(0xFFFFFFFFUL, rng_base + RNG_INT_STATUS_OFFSET); > @@ -83,11 +94,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) > val &= ~RBG_SOFT_RESET; > iowrite32(val, rng_base + RBG_SOFT_RESET_OFFSET); > > - /* Enable RBG */ > - val = ioread32(rng_base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, rng_base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(rng_base, true); > } > > static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, > @@ -154,13 +161,8 @@ static int iproc_rng200_read(struct hwrng *rng, void *buf, size_t max, > static int iproc_rng200_init(struct hwrng *rng) > { > struct iproc_rng200_dev *priv = to_rng_priv(rng); > - uint32_t val; > > - /* Setup RNG. */ > - val = ioread32(priv->base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, priv->base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(priv->base, true); > > return 0; > } > @@ -168,13 +170,8 @@ static int iproc_rng200_init(struct hwrng *rng) > static void iproc_rng200_cleanup(struct hwrng *rng) > { > struct iproc_rng200_dev *priv = to_rng_priv(rng); > - uint32_t val; > > - /* Disable RNG hardware */ > - val = ioread32(priv->base + RNG_CTRL_OFFSET); > - val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > - iowrite32(val, priv->base + RNG_CTRL_OFFSET); > + iproc_rng200_enable(priv->base, false); > } > > static int iproc_rng200_probe(struct platform_device *pdev) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. 2020-12-14 16:04 ` matthias.bgg @ 2020-12-14 17:36 ` Florian Fainelli -1 siblings, 0 replies; 14+ messages in thread From: Florian Fainelli @ 2020-12-14 17:36 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger On 12/14/20 8:04 AM, matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > When trying to disable the block we bitwise or the control > register with value zero. This will leave the block always turned on. > Fix this by setting the corresponding bit to zero. > > Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") > Signed-off-by: Matthias Brugger <mbrugger@suse.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> -- Florian ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. @ 2020-12-14 17:36 ` Florian Fainelli 0 siblings, 0 replies; 14+ messages in thread From: Florian Fainelli @ 2020-12-14 17:36 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 12/14/20 8:04 AM, matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > When trying to disable the block we bitwise or the control > register with value zero. This will leave the block always turned on. > Fix this by setting the corresponding bit to zero. > > Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") > Signed-off-by: Matthias Brugger <mbrugger@suse.com> Acked-by: Florian Fainelli <f.fainelli@gmail.com> -- Florian _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. 2020-12-14 16:04 ` matthias.bgg @ 2020-12-14 17:45 ` Scott Branden -1 siblings, 0 replies; 14+ messages in thread From: Scott Branden @ 2020-12-14 17:45 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto, Matthias Brugger On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > When trying to disable the block we bitwise or the control > register with value zero. This will leave the block always turned on. > Fix this by setting the corresponding bit to zero. > > Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") Commit message needs to be re-written. I don't think this is an actual fix as the ~RNG_CTL_RNG_RBGEN_MASK already zeros the bit. This is just a code change, which is fine because it makes things clearer > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > --- > > drivers/char/hw_random/iproc-rng200.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index 01583faf9893..e106ce3c0146 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -28,7 +28,6 @@ > #define RNG_CTRL_OFFSET 0x00 > #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF > #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 > -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 > > #define RNG_SOFT_RESET_OFFSET 0x04 > #define RNG_SOFT_RESET 0x00000001 > @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) > /* Disable RBG */ > val = ioread32(rng_base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; This mask will already zero the enable bit. > - val |= RNG_CTRL_RNG_RBGEN_DISABLE; > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > iowrite32(val, rng_base + RNG_CTRL_OFFSET); > > /* Clear all interrupt status */ > @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) > /* Disable RNG hardware */ > val = ioread32(priv->base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_DISABLE; > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > iowrite32(val, priv->base + RNG_CTRL_OFFSET); > } > ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. @ 2020-12-14 17:45 ` Scott Branden 0 siblings, 0 replies; 14+ messages in thread From: Scott Branden @ 2020-12-14 17:45 UTC (permalink / raw) To: matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: Matthias Brugger, linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: > From: Matthias Brugger <mbrugger@suse.com> > > When trying to disable the block we bitwise or the control > register with value zero. This will leave the block always turned on. > Fix this by setting the corresponding bit to zero. > > Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") Commit message needs to be re-written. I don't think this is an actual fix as the ~RNG_CTL_RNG_RBGEN_MASK already zeros the bit. This is just a code change, which is fine because it makes things clearer > Signed-off-by: Matthias Brugger <mbrugger@suse.com> > --- > > drivers/char/hw_random/iproc-rng200.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c > index 01583faf9893..e106ce3c0146 100644 > --- a/drivers/char/hw_random/iproc-rng200.c > +++ b/drivers/char/hw_random/iproc-rng200.c > @@ -28,7 +28,6 @@ > #define RNG_CTRL_OFFSET 0x00 > #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF > #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 > -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 > > #define RNG_SOFT_RESET_OFFSET 0x04 > #define RNG_SOFT_RESET 0x00000001 > @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) > /* Disable RBG */ > val = ioread32(rng_base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; This mask will already zero the enable bit. > - val |= RNG_CTRL_RNG_RBGEN_DISABLE; > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > iowrite32(val, rng_base + RNG_CTRL_OFFSET); > > /* Clear all interrupt status */ > @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) > /* Disable RNG hardware */ > val = ioread32(priv->base + RNG_CTRL_OFFSET); > val &= ~RNG_CTRL_RNG_RBGEN_MASK; > - val |= RNG_CTRL_RNG_RBGEN_DISABLE; > + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; > iowrite32(val, priv->base + RNG_CTRL_OFFSET); > } > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. 2020-12-14 17:45 ` Scott Branden @ 2020-12-18 10:49 ` Matthias Brugger -1 siblings, 0 replies; 14+ messages in thread From: Matthias Brugger @ 2020-12-18 10:49 UTC (permalink / raw) To: Scott Branden, matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 14/12/2020 18:45, Scott Branden wrote: > > > On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: >> From: Matthias Brugger <mbrugger@suse.com> >> >> When trying to disable the block we bitwise or the control >> register with value zero. This will leave the block always turned on. >> Fix this by setting the corresponding bit to zero. >> >> Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") > Commit message needs to be re-written. > I don't think this is an actual fix as the ~RNG_CTL_RNG_RBGEN_MASK already zeros the bit. This is just a code change, which is fine because it makes things clearer Right, I'll reword it. >> Signed-off-by: Matthias Brugger <mbrugger@suse.com> >> --- >> >> drivers/char/hw_random/iproc-rng200.c | 5 ++--- >> 1 file changed, 2 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c >> index 01583faf9893..e106ce3c0146 100644 >> --- a/drivers/char/hw_random/iproc-rng200.c >> +++ b/drivers/char/hw_random/iproc-rng200.c >> @@ -28,7 +28,6 @@ >> #define RNG_CTRL_OFFSET 0x00 >> #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF >> #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 >> -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 >> >> #define RNG_SOFT_RESET_OFFSET 0x04 >> #define RNG_SOFT_RESET 0x00000001 >> @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) >> /* Disable RBG */ >> val = ioread32(rng_base + RNG_CTRL_OFFSET); >> val &= ~RNG_CTRL_RNG_RBGEN_MASK; > This mask will already zero the enable bit. >> - val |= RNG_CTRL_RNG_RBGEN_DISABLE; >> + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; Correct, so no need for this extra line. I'll delete it. >> iowrite32(val, rng_base + RNG_CTRL_OFFSET); >> >> /* Clear all interrupt status */ >> @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) >> /* Disable RNG hardware */ >> val = ioread32(priv->base + RNG_CTRL_OFFSET); >> val &= ~RNG_CTRL_RNG_RBGEN_MASK; >> - val |= RNG_CTRL_RNG_RBGEN_DISABLE; >> + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; >> iowrite32(val, priv->base + RNG_CTRL_OFFSET); >> } >> > ^ permalink raw reply [flat|nested] 14+ messages in thread
* Re: [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block. @ 2020-12-18 10:49 ` Matthias Brugger 0 siblings, 0 replies; 14+ messages in thread From: Matthias Brugger @ 2020-12-18 10:49 UTC (permalink / raw) To: Scott Branden, matthias.bgg, mpm, herbert, rjui, sbranden, f.fainelli Cc: linux-kernel, Julia.Lawall, bcm-kernel-feedback-list, linux-arm-kernel, nsaenzjulienne, linux-crypto On 14/12/2020 18:45, Scott Branden wrote: > > > On 2020-12-14 8:04 a.m., matthias.bgg@kernel.org wrote: >> From: Matthias Brugger <mbrugger@suse.com> >> >> When trying to disable the block we bitwise or the control >> register with value zero. This will leave the block always turned on. >> Fix this by setting the corresponding bit to zero. >> >> Fixes: c83d45d5685f ("hwrng: iproc-rng200 - Add Broadcom IPROC RNG driver") > Commit message needs to be re-written. > I don't think this is an actual fix as the ~RNG_CTL_RNG_RBGEN_MASK already zeros the bit. This is just a code change, which is fine because it makes things clearer Right, I'll reword it. >> Signed-off-by: Matthias Brugger <mbrugger@suse.com> >> --- >> >> drivers/char/hw_random/iproc-rng200.c | 5 ++--- >> 1 file changed, 2 insertions(+), 3 deletions(-) >> >> diff --git a/drivers/char/hw_random/iproc-rng200.c b/drivers/char/hw_random/iproc-rng200.c >> index 01583faf9893..e106ce3c0146 100644 >> --- a/drivers/char/hw_random/iproc-rng200.c >> +++ b/drivers/char/hw_random/iproc-rng200.c >> @@ -28,7 +28,6 @@ >> #define RNG_CTRL_OFFSET 0x00 >> #define RNG_CTRL_RNG_RBGEN_MASK 0x00001FFF >> #define RNG_CTRL_RNG_RBGEN_ENABLE 0x00000001 >> -#define RNG_CTRL_RNG_RBGEN_DISABLE 0x00000000 >> >> #define RNG_SOFT_RESET_OFFSET 0x04 >> #define RNG_SOFT_RESET 0x00000001 >> @@ -61,7 +60,7 @@ static void iproc_rng200_restart(void __iomem *rng_base) >> /* Disable RBG */ >> val = ioread32(rng_base + RNG_CTRL_OFFSET); >> val &= ~RNG_CTRL_RNG_RBGEN_MASK; > This mask will already zero the enable bit. >> - val |= RNG_CTRL_RNG_RBGEN_DISABLE; >> + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; Correct, so no need for this extra line. I'll delete it. >> iowrite32(val, rng_base + RNG_CTRL_OFFSET); >> >> /* Clear all interrupt status */ >> @@ -174,7 +173,7 @@ static void iproc_rng200_cleanup(struct hwrng *rng) >> /* Disable RNG hardware */ >> val = ioread32(priv->base + RNG_CTRL_OFFSET); >> val &= ~RNG_CTRL_RNG_RBGEN_MASK; >> - val |= RNG_CTRL_RNG_RBGEN_DISABLE; >> + val &= ~RNG_CTRL_RNG_RBGEN_ENABLE; >> iowrite32(val, priv->base + RNG_CTRL_OFFSET); >> } >> > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 14+ messages in thread
end of thread, other threads:[~2020-12-18 10:53 UTC | newest] Thread overview: 14+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2020-12-14 16:04 [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block matthias.bgg 2020-12-14 16:04 ` matthias.bgg 2020-12-14 16:04 ` [PATCH 2/2] hwrng: iproc-rng200: Move enable/disable in separate function matthias.bgg 2020-12-14 16:04 ` matthias.bgg 2020-12-14 17:39 ` Florian Fainelli 2020-12-14 17:39 ` Florian Fainelli 2020-12-14 17:50 ` Scott Branden 2020-12-14 17:50 ` Scott Branden 2020-12-14 17:36 ` [PATCH 1/2] hwrng: iproc-rng200: Fix disable of the block Florian Fainelli 2020-12-14 17:36 ` Florian Fainelli 2020-12-14 17:45 ` Scott Branden 2020-12-14 17:45 ` Scott Branden 2020-12-18 10:49 ` Matthias Brugger 2020-12-18 10:49 ` Matthias Brugger
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.