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[RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support

Started byCosar Dindar <cosardindar@gmail.com>
First post2017-07-17 10:30 +0200
Last post2017-07-17 18:20 +0200
Articles 3 — 2 participants

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  [RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support Cosar Dindar <cosardindar@gmail.com> - 2017-07-17 10:30 +0200
    Re: [RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support Lionel DEBIEVE <lionel.debieve@st.com> - 2017-07-17 16:30 +0200
      Re: [RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support Cosar Dindar <cosardindar@gmail.com> - 2017-07-17 18:20 +0200

#1688763 — [RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support

FromCosar Dindar <cosardindar@gmail.com>
Date2017-07-17 10:30 +0200
Subject[RESEND,PATCH v4 3/3] crypto : stm32 - Add STM32F4 CRC32 support
Message-ID<u49zI-2z2-23@gated-at.bofh.it>
This patch adds CRC (CRC32 Crypto) support for STM32F4 series.

As an hardware limitation polynomial and key setting are not supported.
They are fixed as 0x4C11DB7 (poly) and 0xFFFFFFFF (key).
CRC32C Castagnoli algorithm is not used.

Signed-off-by: Cosar Dindar <cosardindar@gmail.com>
Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
---
 drivers/crypto/stm32/stm32_crc32.c | 68 ++++++++++++++++++++++++++++++++------
 1 file changed, 58 insertions(+), 10 deletions(-)

diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
index ec83b1e..12fbd98 100644
--- a/drivers/crypto/stm32/stm32_crc32.c
+++ b/drivers/crypto/stm32/stm32_crc32.c
@@ -7,6 +7,7 @@
 #include <linux/bitrev.h>
 #include <linux/clk.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 
 #include <crypto/internal/hash.h>
@@ -39,6 +40,9 @@ struct stm32_crc {
 	struct clk       *clk;
 	u8               pending_data[sizeof(u32)];
 	size_t           nb_pending_bytes;
+	bool             key_support;
+	bool             poly_support;
+	bool             reverse_support;
 };
 
 struct stm32_crc_list {
@@ -106,13 +110,31 @@ static int stm32_crc_init(struct shash_desc *desc)
 	}
 	spin_unlock_bh(&crc_list.lock);
 
-	/* Reset, set key, poly and configure in bit reverse mode */
-	writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
-	writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
-	writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
+	/* set key */
+	if (ctx->crc->key_support) {
+		writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
+	} else if (mctx->key != CRC_INIT_DEFAULT) {
+		dev_err(ctx->crc->dev, "Unsupported key value! Should be: 0x%x\n",
+			CRC_INIT_DEFAULT);
+		return -EINVAL;
+	}
+
+	/* set poly */
+	if (ctx->crc->poly_support)
+		writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
+
+	/* reset and configure in bit reverse mode if supported */
+	if (ctx->crc->reverse_support)
+		writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
+	else
+		writel(CRC_CR_RESET, ctx->crc->regs + CRC_CR);
+
+	/* store partial result */
+	if (!ctx->crc->reverse_support)
+		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
+	else
+		ctx->partial = readl(ctx->crc->regs + CRC_DR);
 
-	/* Store partial result */
-	ctx->partial = readl(ctx->crc->regs + CRC_DR);
 	ctx->crc->nb_pending_bytes = 0;
 
 	return 0;
@@ -135,7 +157,12 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
 
 		if (crc->nb_pending_bytes == sizeof(u32)) {
 			/* Process completed pending data */
-			writel(*(u32 *)crc->pending_data, crc->regs + CRC_DR);
+			if (!ctx->crc->reverse_support)
+				writel(bitrev32(*(u32 *)crc->pending_data),
+				       crc->regs + CRC_DR);
+			else
+				writel(*(u32 *)crc->pending_data,
+				       crc->regs + CRC_DR);
 			crc->nb_pending_bytes = 0;
 		}
 	}
@@ -143,10 +170,16 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
 	d32 = (u32 *)d8;
 	for (i = 0; i < length >> 2; i++)
 		/* Process 32 bits data */
-		writel(*(d32++), crc->regs + CRC_DR);
+		if (!ctx->crc->reverse_support)
+			writel(bitrev32(*(d32++)), crc->regs + CRC_DR);
+		else
+			writel(*(d32++), crc->regs + CRC_DR);
 
 	/* Store partial result */
-	ctx->partial = readl(crc->regs + CRC_DR);
+	if (!ctx->crc->reverse_support)
+		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
+	else
+		ctx->partial = readl(crc->regs + CRC_DR);
 
 	/* Check for pending data (non 32 bits) */
 	length &= 3;
@@ -243,6 +276,7 @@ static int stm32_crc_probe(struct platform_device *pdev)
 	struct stm32_crc *crc;
 	struct resource *res;
 	int ret;
+	int algs_size;
 
 	crc = devm_kzalloc(dev, sizeof(*crc), GFP_KERNEL);
 	if (!crc)
@@ -269,13 +303,26 @@ static int stm32_crc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	/* set key, poly and reverse support if device is of F7 series */
+	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f7-crc")) {
+		crc->key_support = true;
+		crc->poly_support = true;
+		crc->reverse_support = true;
+	}
+
 	platform_set_drvdata(pdev, crc);
 
 	spin_lock(&crc_list.lock);
 	list_add(&crc->list, &crc_list.dev_list);
 	spin_unlock(&crc_list.lock);
 
-	ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
+	/* For F4 series only CRC32 algorithm will be used */
+	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc"))
+		algs_size = 1;
+	else
+		algs_size = ARRAY_SIZE(algs);
+
+	ret = crypto_register_shashes(algs, algs_size);
 	if (ret) {
 		dev_err(dev, "Failed to register\n");
 		clk_disable_unprepare(crc->clk);
@@ -304,6 +351,7 @@ static int stm32_crc_remove(struct platform_device *pdev)
 
 static const struct of_device_id stm32_dt_ids[] = {
 	{ .compatible = "st,stm32f7-crc", },
+	{ .compatible = "st,stm32f4-crc", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, stm32_dt_ids);
-- 
2.7.4

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#1689101

FromLionel DEBIEVE <lionel.debieve@st.com>
Date2017-07-17 16:30 +0200
Message-ID<u4fc6-6e7-13@gated-at.bofh.it>
In reply to#1688763
Hi Cosar,

-	ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
+	/* For F4 series only CRC32 algorithm will be used */
+	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc"))
+		algs_size = 1;
+	else
+		algs_size = ARRAY_SIZE(algs);
+
+	ret = crypto_register_shashes(algs, algs_size);

Should it be better to have a dedicated array per platform data instead? Could be new platform update?

BR,

Lionel


On 07/17/2017 10:27 AM, Cosar Dindar wrote:
> This patch adds CRC (CRC32 Crypto) support for STM32F4 series.
>
> As an hardware limitation polynomial and key setting are not supported.
> They are fixed as 0x4C11DB7 (poly) and 0xFFFFFFFF (key).
> CRC32C Castagnoli algorithm is not used.
>
> Signed-off-by: Cosar Dindar <cosardindar@gmail.com>
> Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
> ---
>   drivers/crypto/stm32/stm32_crc32.c | 68 ++++++++++++++++++++++++++++++++------
>   1 file changed, 58 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
> index ec83b1e..12fbd98 100644
> --- a/drivers/crypto/stm32/stm32_crc32.c
> +++ b/drivers/crypto/stm32/stm32_crc32.c
> @@ -7,6 +7,7 @@
>   #include <linux/bitrev.h>
>   #include <linux/clk.h>
>   #include <linux/module.h>
> +#include <linux/of.h>
>   #include <linux/platform_device.h>
>   
>   #include <crypto/internal/hash.h>
> @@ -39,6 +40,9 @@ struct stm32_crc {
>   	struct clk       *clk;
>   	u8               pending_data[sizeof(u32)];
>   	size_t           nb_pending_bytes;
> +	bool             key_support;
> +	bool             poly_support;
> +	bool             reverse_support;
>   };
>   
>   struct stm32_crc_list {
> @@ -106,13 +110,31 @@ static int stm32_crc_init(struct shash_desc *desc)
>   	}
>   	spin_unlock_bh(&crc_list.lock);
>   
> -	/* Reset, set key, poly and configure in bit reverse mode */
> -	writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
> -	writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
> -	writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
> +	/* set key */
> +	if (ctx->crc->key_support) {
> +		writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
> +	} else if (mctx->key != CRC_INIT_DEFAULT) {
> +		dev_err(ctx->crc->dev, "Unsupported key value! Should be: 0x%x\n",
> +			CRC_INIT_DEFAULT);
> +		return -EINVAL;
> +	}
> +
> +	/* set poly */
> +	if (ctx->crc->poly_support)
> +		writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
> +
> +	/* reset and configure in bit reverse mode if supported */
> +	if (ctx->crc->reverse_support)
> +		writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
> +	else
> +		writel(CRC_CR_RESET, ctx->crc->regs + CRC_CR);
> +
> +	/* store partial result */
> +	if (!ctx->crc->reverse_support)
> +		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
> +	else
> +		ctx->partial = readl(ctx->crc->regs + CRC_DR);
>   
> -	/* Store partial result */
> -	ctx->partial = readl(ctx->crc->regs + CRC_DR);
>   	ctx->crc->nb_pending_bytes = 0;
>   
>   	return 0;
> @@ -135,7 +157,12 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
>   
>   		if (crc->nb_pending_bytes == sizeof(u32)) {
>   			/* Process completed pending data */
> -			writel(*(u32 *)crc->pending_data, crc->regs + CRC_DR);
> +			if (!ctx->crc->reverse_support)
> +				writel(bitrev32(*(u32 *)crc->pending_data),
> +				       crc->regs + CRC_DR);
> +			else
> +				writel(*(u32 *)crc->pending_data,
> +				       crc->regs + CRC_DR);
>   			crc->nb_pending_bytes = 0;
>   		}
>   	}
> @@ -143,10 +170,16 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
>   	d32 = (u32 *)d8;
>   	for (i = 0; i < length >> 2; i++)
>   		/* Process 32 bits data */
> -		writel(*(d32++), crc->regs + CRC_DR);
> +		if (!ctx->crc->reverse_support)
> +			writel(bitrev32(*(d32++)), crc->regs + CRC_DR);
> +		else
> +			writel(*(d32++), crc->regs + CRC_DR);
>   
>   	/* Store partial result */
> -	ctx->partial = readl(crc->regs + CRC_DR);
> +	if (!ctx->crc->reverse_support)
> +		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
> +	else
> +		ctx->partial = readl(crc->regs + CRC_DR);
>   
>   	/* Check for pending data (non 32 bits) */
>   	length &= 3;
> @@ -243,6 +276,7 @@ static int stm32_crc_probe(struct platform_device *pdev)
>   	struct stm32_crc *crc;
>   	struct resource *res;
>   	int ret;
> +	int algs_size;
>   
>   	crc = devm_kzalloc(dev, sizeof(*crc), GFP_KERNEL);
>   	if (!crc)
> @@ -269,13 +303,26 @@ static int stm32_crc_probe(struct platform_device *pdev)
>   		return ret;
>   	}
>   
> +	/* set key, poly and reverse support if device is of F7 series */
> +	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f7-crc")) {
> +		crc->key_support = true;
> +		crc->poly_support = true;
> +		crc->reverse_support = true;
> +	}
> +
>   	platform_set_drvdata(pdev, crc);
>   
>   	spin_lock(&crc_list.lock);
>   	list_add(&crc->list, &crc_list.dev_list);
>   	spin_unlock(&crc_list.lock);
>   
> -	ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
> +	/* For F4 series only CRC32 algorithm will be used */
> +	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc"))
> +		algs_size = 1;
> +	else
> +		algs_size = ARRAY_SIZE(algs);
> +
> +	ret = crypto_register_shashes(algs, algs_size);
>   	if (ret) {
>   		dev_err(dev, "Failed to register\n");
>   		clk_disable_unprepare(crc->clk);
> @@ -304,6 +351,7 @@ static int stm32_crc_remove(struct platform_device *pdev)
>   
>   static const struct of_device_id stm32_dt_ids[] = {
>   	{ .compatible = "st,stm32f7-crc", },
> +	{ .compatible = "st,stm32f4-crc", },
>   	{},
>   };
>   MODULE_DEVICE_TABLE(of, stm32_dt_ids);

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#1689223

FromCosar Dindar <cosardindar@gmail.com>
Date2017-07-17 18:20 +0200
Message-ID<u4gUx-7l9-15@gated-at.bofh.it>
In reply to#1689101
On Mon, Jul 17, 2017 at 02:23:44PM +0000, Lionel DEBIEVE wrote:
> Hi Cosar,
> 
> -	ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
> +	/* For F4 series only CRC32 algorithm will be used */
> +	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc"))
> +		algs_size = 1;
> +	else
> +		algs_size = ARRAY_SIZE(algs);
> +
> +	ret = crypto_register_shashes(algs, algs_size);
> 
> Should it be better to have a dedicated array per platform data instead? Could be new platform update?
> 
> BR,
> 
> Lionel
>

Hi Lionel,

Thanks for the comment.

It might be better to seperate shash_alg array according to the platform, one alg array for F7 and one for M4.
Adding a new array definition for M4 platform with only CRC-32 algorithm might be enough.
This action would be necessary since it might cause problem while unregistering with your last patch.

BR,

Cosar
 
> 
> On 07/17/2017 10:27 AM, Cosar Dindar wrote:
> > This patch adds CRC (CRC32 Crypto) support for STM32F4 series.
> >
> > As an hardware limitation polynomial and key setting are not supported.
> > They are fixed as 0x4C11DB7 (poly) and 0xFFFFFFFF (key).
> > CRC32C Castagnoli algorithm is not used.
> >
> > Signed-off-by: Cosar Dindar <cosardindar@gmail.com>
> > Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
> > ---
> >   drivers/crypto/stm32/stm32_crc32.c | 68 ++++++++++++++++++++++++++++++++------
> >   1 file changed, 58 insertions(+), 10 deletions(-)
> >
> > diff --git a/drivers/crypto/stm32/stm32_crc32.c b/drivers/crypto/stm32/stm32_crc32.c
> > index ec83b1e..12fbd98 100644
> > --- a/drivers/crypto/stm32/stm32_crc32.c
> > +++ b/drivers/crypto/stm32/stm32_crc32.c
> > @@ -7,6 +7,7 @@
> >   #include <linux/bitrev.h>
> >   #include <linux/clk.h>
> >   #include <linux/module.h>
> > +#include <linux/of.h>
> >   #include <linux/platform_device.h>
> >   
> >   #include <crypto/internal/hash.h>
> > @@ -39,6 +40,9 @@ struct stm32_crc {
> >   	struct clk       *clk;
> >   	u8               pending_data[sizeof(u32)];
> >   	size_t           nb_pending_bytes;
> > +	bool             key_support;
> > +	bool             poly_support;
> > +	bool             reverse_support;
> >   };
> >   
> >   struct stm32_crc_list {
> > @@ -106,13 +110,31 @@ static int stm32_crc_init(struct shash_desc *desc)
> >   	}
> >   	spin_unlock_bh(&crc_list.lock);
> >   
> > -	/* Reset, set key, poly and configure in bit reverse mode */
> > -	writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
> > -	writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
> > -	writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
> > +	/* set key */
> > +	if (ctx->crc->key_support) {
> > +		writel(bitrev32(mctx->key), ctx->crc->regs + CRC_INIT);
> > +	} else if (mctx->key != CRC_INIT_DEFAULT) {
> > +		dev_err(ctx->crc->dev, "Unsupported key value! Should be: 0x%x\n",
> > +			CRC_INIT_DEFAULT);
> > +		return -EINVAL;
> > +	}
> > +
> > +	/* set poly */
> > +	if (ctx->crc->poly_support)
> > +		writel(bitrev32(mctx->poly), ctx->crc->regs + CRC_POL);
> > +
> > +	/* reset and configure in bit reverse mode if supported */
> > +	if (ctx->crc->reverse_support)
> > +		writel(CRC_CR_RESET | CRC_CR_REVERSE, ctx->crc->regs + CRC_CR);
> > +	else
> > +		writel(CRC_CR_RESET, ctx->crc->regs + CRC_CR);
> > +
> > +	/* store partial result */
> > +	if (!ctx->crc->reverse_support)
> > +		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
> > +	else
> > +		ctx->partial = readl(ctx->crc->regs + CRC_DR);
> >   
> > -	/* Store partial result */
> > -	ctx->partial = readl(ctx->crc->regs + CRC_DR);
> >   	ctx->crc->nb_pending_bytes = 0;
> >   
> >   	return 0;
> > @@ -135,7 +157,12 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
> >   
> >   		if (crc->nb_pending_bytes == sizeof(u32)) {
> >   			/* Process completed pending data */
> > -			writel(*(u32 *)crc->pending_data, crc->regs + CRC_DR);
> > +			if (!ctx->crc->reverse_support)
> > +				writel(bitrev32(*(u32 *)crc->pending_data),
> > +				       crc->regs + CRC_DR);
> > +			else
> > +				writel(*(u32 *)crc->pending_data,
> > +				       crc->regs + CRC_DR);
> >   			crc->nb_pending_bytes = 0;
> >   		}
> >   	}
> > @@ -143,10 +170,16 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8,
> >   	d32 = (u32 *)d8;
> >   	for (i = 0; i < length >> 2; i++)
> >   		/* Process 32 bits data */
> > -		writel(*(d32++), crc->regs + CRC_DR);
> > +		if (!ctx->crc->reverse_support)
> > +			writel(bitrev32(*(d32++)), crc->regs + CRC_DR);
> > +		else
> > +			writel(*(d32++), crc->regs + CRC_DR);
> >   
> >   	/* Store partial result */
> > -	ctx->partial = readl(crc->regs + CRC_DR);
> > +	if (!ctx->crc->reverse_support)
> > +		ctx->partial = bitrev32(readl(crc->regs + CRC_DR));
> > +	else
> > +		ctx->partial = readl(crc->regs + CRC_DR);
> >   
> >   	/* Check for pending data (non 32 bits) */
> >   	length &= 3;
> > @@ -243,6 +276,7 @@ static int stm32_crc_probe(struct platform_device *pdev)
> >   	struct stm32_crc *crc;
> >   	struct resource *res;
> >   	int ret;
> > +	int algs_size;
> >   
> >   	crc = devm_kzalloc(dev, sizeof(*crc), GFP_KERNEL);
> >   	if (!crc)
> > @@ -269,13 +303,26 @@ static int stm32_crc_probe(struct platform_device *pdev)
> >   		return ret;
> >   	}
> >   
> > +	/* set key, poly and reverse support if device is of F7 series */
> > +	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f7-crc")) {
> > +		crc->key_support = true;
> > +		crc->poly_support = true;
> > +		crc->reverse_support = true;
> > +	}
> > +
> >   	platform_set_drvdata(pdev, crc);
> >   
> >   	spin_lock(&crc_list.lock);
> >   	list_add(&crc->list, &crc_list.dev_list);
> >   	spin_unlock(&crc_list.lock);
> >   
> > -	ret = crypto_register_shashes(algs, ARRAY_SIZE(algs));
> > +	/* For F4 series only CRC32 algorithm will be used */
> > +	if (of_device_is_compatible(crc->dev->of_node, "st,stm32f4-crc"))
> > +		algs_size = 1;
> > +	else
> > +		algs_size = ARRAY_SIZE(algs);
> > +
> > +	ret = crypto_register_shashes(algs, algs_size);
> >   	if (ret) {
> >   		dev_err(dev, "Failed to register\n");
> >   		clk_disable_unprepare(crc->clk);
> > @@ -304,6 +351,7 @@ static int stm32_crc_remove(struct platform_device *pdev)
> >   
> >   static const struct of_device_id stm32_dt_ids[] = {
> >   	{ .compatible = "st,stm32f7-crc", },
> > +	{ .compatible = "st,stm32f4-crc", },
> >   	{},
> >   };
> >   MODULE_DEVICE_TABLE(of, stm32_dt_ids);

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