[PATCH v3 0/3] add AES support for Exynos5433

[PATCH v3 0/3] add AES support for Exynos5433

[Kamil Konieczny]

Add slimSSS node to DT and crypto AES support for Exynos5433. Tested on
Exynos5433 board with crypto run-time self tests and with tcrypt with
command insmod tcrypt.ko mode=500 sec=1

Changes since v2:
- address Corentine Labbe note: add "const" to char* in declaration of
  struct samsung_aes_variant

Changes since v1:
- address Krzysztof Kozlowski review: add missing comma in struct
  definition, add goto for error code path, correct indentation,
  in documentation add that Exynos5433 has both slimSSS and SSS IPs.

Kamil Konieczny (3):
  arm64: dts: exynos: add SlimSSS for Exynos5433
  dt-bindings: crypto: document Exynos5433 SlimSSS
  crypto: s5p: add AES support for Exynos5433

 .../bindings/crypto/samsung-sss.txt           | 14 ++++--
 arch/arm64/boot/dts/exynos/exynos5433.dtsi    |  9 ++++
 drivers/crypto/s5p-sss.c                      | 50 +++++++++++++++++--
 3 files changed, 66 insertions(+), 7 deletions(-)

-- 
2.20.0

[PATCH v3 2/3] dt-bindings: crypto: document Exynos5433 SlimSSS

[Kamil Konieczny]

Document DT bindings for crypto Samsung Exynos5433 SlimSSS (Slim Security
SubSystem) IP.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
---
 .../devicetree/bindings/crypto/samsung-sss.txt     | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
index 7a5ca56683cc..d9af679d38ab 100644
--- a/Documentation/devicetree/bindings/crypto/samsung-sss.txt
+++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
@@ -1,4 +1,4 @@
-Samsung SoC SSS (Security SubSystem) module
+Samsung SoC SSS (Security SubSystem) and SlimSSS module
 
 The SSS module in S5PV210 SoC supports the following:
 -- Feeder (FeedCtrl)
@@ -15,6 +15,12 @@ supports the following also:
 -- True Random Number Generator (TRNG)
 -- Secure Key Manager
 
+Exynos5433 has both SSS and SlimSSS module.
+SlimSSS in Exynos5433 supports:
+-- Feeder (FeedCtrl)
+-- Advanced Encryption Standard (AES)
+-- SHA-1/SHA-256/HMAC (SHA-1/SHA-256)
+
 Required properties:
 
 - compatible : Should contain entries for this and backward compatible
@@ -22,11 +28,13 @@ Required properties:
   - "samsung,s5pv210-secss" for S5PV210 SoC.
   - "samsung,exynos4210-secss" for Exynos4210, Exynos4212, Exynos4412, Exynos5250,
 		Exynos5260 and Exynos5420 SoCs.
+  - "samsung,exynos5433-slim-sss" for Exynos5433 SoCs.
 - reg : Offset and length of the register set for the module
 - interrupts : interrupt specifiers of SSS module interrupts (one feed
 		control interrupt).
 
 - clocks : list of clock phandle and specifier pairs for all clocks  listed in
 		clock-names property.
-- clock-names : list of device clock input names; should contain one entry
-		"secss".
+- clock-names : list of device clock input names; should contain "pclk" and
+		"aclk" for slim-sss in Exynos5433, and one entry "secss" for
+		other compatibles.
-- 
2.20.0

Re: [PATCH v3 2/3] dt-bindings: crypto: document Exynos5433 SlimSSS

[Rob Herring]

On Thu, Jan 24, 2019 at 04:45:20PM +0100, Kamil Konieczny wrote:
> Document DT bindings for crypto Samsung Exynos5433 SlimSSS (Slim Security
> SubSystem) IP.
> 
> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
> Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
> ---
>  .../devicetree/bindings/crypto/samsung-sss.txt     | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> index 7a5ca56683cc..d9af679d38ab 100644
> --- a/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> +++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
> @@ -1,4 +1,4 @@
> -Samsung SoC SSS (Security SubSystem) module
> +Samsung SoC SSS (Security SubSystem) and SlimSSS module
>  
>  The SSS module in S5PV210 SoC supports the following:
>  -- Feeder (FeedCtrl)
> @@ -15,6 +15,12 @@ supports the following also:
>  -- True Random Number Generator (TRNG)
>  -- Secure Key Manager
>  
> +Exynos5433 has both SSS and SlimSSS module.

That's not really relevant to the binding.

What do the SSS and SlimSSS share? Only that both have a single reg and 
interrupt based on the binding? This should probably be just 2 
documents. If not now, it will have to be when converted to a DT schema.

> +SlimSSS in Exynos5433 supports:
> +-- Feeder (FeedCtrl)
> +-- Advanced Encryption Standard (AES)
> +-- SHA-1/SHA-256/HMAC (SHA-1/SHA-256)
> +
>  Required properties:
>  
>  - compatible : Should contain entries for this and backward compatible
> @@ -22,11 +28,13 @@ Required properties:
>    - "samsung,s5pv210-secss" for S5PV210 SoC.
>    - "samsung,exynos4210-secss" for Exynos4210, Exynos4212, Exynos4412, Exynos5250,
>  		Exynos5260 and Exynos5420 SoCs.
> +  - "samsung,exynos5433-slim-sss" for Exynos5433 SoCs.
>  - reg : Offset and length of the register set for the module
>  - interrupts : interrupt specifiers of SSS module interrupts (one feed
>  		control interrupt).
>  
>  - clocks : list of clock phandle and specifier pairs for all clocks  listed in
>  		clock-names property.
> -- clock-names : list of device clock input names; should contain one entry
> -		"secss".
> +- clock-names : list of device clock input names; should contain "pclk" and
> +		"aclk" for slim-sss in Exynos5433, and one entry "secss" for
> +		other compatibles.
> -- 
> 2.20.0
> 

Re: [PATCH v3 2/3] dt-bindings: crypto: document Exynos5433 SlimSSS

[Kamil Konieczny]

Hi,

On 30.01.2019 17:51, Rob Herring wrote:
> On Thu, Jan 24, 2019 at 04:45:20PM +0100, Kamil Konieczny wrote:
>> Document DT bindings for crypto Samsung Exynos5433 SlimSSS (Slim Security
>> SubSystem) IP.
>>
>> Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
>> Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
>> ---
>>  .../devicetree/bindings/crypto/samsung-sss.txt     | 14 +++++++++++---
>>  1 file changed, 11 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/crypto/samsung-sss.txt b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
>> index 7a5ca56683cc..d9af679d38ab 100644
>> --- a/Documentation/devicetree/bindings/crypto/samsung-sss.txt
>> +++ b/Documentation/devicetree/bindings/crypto/samsung-sss.txt
>> @@ -1,4 +1,4 @@
>> -Samsung SoC SSS (Security SubSystem) module
>> +Samsung SoC SSS (Security SubSystem) and SlimSSS module
>>  
>>  The SSS module in S5PV210 SoC supports the following:
>>  -- Feeder (FeedCtrl)
>> @@ -15,6 +15,12 @@ supports the following also:
>>  -- True Random Number Generator (TRNG)
>>  -- Secure Key Manager
>>  
>> +Exynos5433 has both SSS and SlimSSS module.
> 
> That's not really relevant to the binding.
> 
> What do the SSS and SlimSSS share? Only that both have a single reg and 
> interrupt based on the binding? This should probably be just 2 
> documents. If not now, it will have to be when converted to a DT schema.

They share hardware design, slimSSS is stripped-down SSS version,
and can be handled by the same crypto s5p-sss driver. The register
layout is the same for FeedControl (DMA) and AES crypt function.

Do you prefer to put this description in new file samsung-slimsss.txt ?
If yes, I can send v4, so it can be done right from beginning.

>> +SlimSSS in Exynos5433 supports:
>> +-- Feeder (FeedCtrl)
>> +-- Advanced Encryption Standard (AES)
>> +-- SHA-1/SHA-256/HMAC (SHA-1/SHA-256)
>> +
>>  Required properties:
>>  
>>  - compatible : Should contain entries for this and backward compatible
>> @@ -22,11 +28,13 @@ Required properties:
>>    - "samsung,s5pv210-secss" for S5PV210 SoC.
>>    - "samsung,exynos4210-secss" for Exynos4210, Exynos4212, Exynos4412, Exynos5250,
>>  		Exynos5260 and Exynos5420 SoCs.
>> +  - "samsung,exynos5433-slim-sss" for Exynos5433 SoCs.
>>  - reg : Offset and length of the register set for the module
>>  - interrupts : interrupt specifiers of SSS module interrupts (one feed
>>  		control interrupt).
>>  
>>  - clocks : list of clock phandle and specifier pairs for all clocks  listed in
>>  		clock-names property.
>> -- clock-names : list of device clock input names; should contain one entry
>> -		"secss".
>> +- clock-names : list of device clock input names; should contain "pclk" and
>> +		"aclk" for slim-sss in Exynos5433, and one entry "secss" for
>> +		other compatibles.
>> -- 
>> 2.20.0

-- 
Best regards,
Kamil Konieczny
Samsung R&D Institute Poland

[PATCH v3 3/3] crypto: s5p: add AES support for Exynos5433

[Kamil Konieczny]

Add AES crypto HW acceleration for Exynos5433, with the help of SlimSSS IP.

Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Kamil Konieczny <k.konieczny@partner.samsung.com>
---
 drivers/crypto/s5p-sss.c | 50 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 46 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/s5p-sss.c b/drivers/crypto/s5p-sss.c
index 0064be0e3941..3f45cc5cb94a 100644
--- a/drivers/crypto/s5p-sss.c
+++ b/drivers/crypto/s5p-sss.c
@@ -232,6 +232,7 @@
  * struct samsung_aes_variant - platform specific SSS driver data
  * @aes_offset: AES register offset from SSS module's base.
  * @hash_offset: HASH register offset from SSS module's base.
+ * @clk_names: names of clocks needed to run SSS IP
  *
  * Specifies platform specific configuration of SSS module.
  * Note: A structure for driver specific platform data is used for future
@@ -240,6 +241,7 @@
 struct samsung_aes_variant {
 	unsigned int			aes_offset;
 	unsigned int			hash_offset;
+	const char			*clk_names[];
 };
 
 struct s5p_aes_reqctx {
@@ -296,6 +298,7 @@ struct s5p_aes_ctx {
 struct s5p_aes_dev {
 	struct device			*dev;
 	struct clk			*clk;
+	struct clk			*pclk;
 	void __iomem			*ioaddr;
 	void __iomem			*aes_ioaddr;
 	int				irq_fc;
@@ -384,11 +387,19 @@ struct s5p_hash_ctx {
 static const struct samsung_aes_variant s5p_aes_data = {
 	.aes_offset	= 0x4000,
 	.hash_offset	= 0x6000,
+	.clk_names	= { "secss", },
 };
 
 static const struct samsung_aes_variant exynos_aes_data = {
 	.aes_offset	= 0x200,
 	.hash_offset	= 0x400,
+	.clk_names	= { "secss", },
+};
+
+static const struct samsung_aes_variant exynos5433_slim_aes_data = {
+	.aes_offset	= 0x400,
+	.hash_offset	= 0x800,
+	.clk_names	= { "pclk", "aclk", },
 };
 
 static const struct of_device_id s5p_sss_dt_match[] = {
@@ -400,6 +411,10 @@ static const struct of_device_id s5p_sss_dt_match[] = {
 		.compatible = "samsung,exynos4210-secss",
 		.data = &exynos_aes_data,
 	},
+	{
+		.compatible = "samsung,exynos5433-slim-sss",
+		.data = &exynos5433_slim_aes_data,
+	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
@@ -2208,18 +2223,39 @@ static int s5p_aes_probe(struct platform_device *pdev)
 			return PTR_ERR(pdata->ioaddr);
 	}
 
-	pdata->clk = devm_clk_get(dev, "secss");
+	pdata->clk = devm_clk_get(dev, variant->clk_names[0]);
 	if (IS_ERR(pdata->clk)) {
-		dev_err(dev, "failed to find secss clock source\n");
+		dev_err(dev, "failed to find secss clock %s\n",
+			variant->clk_names[0]);
 		return -ENOENT;
 	}
 
 	err = clk_prepare_enable(pdata->clk);
 	if (err < 0) {
-		dev_err(dev, "Enabling SSS clk failed, err %d\n", err);
+		dev_err(dev, "Enabling clock %s failed, err %d\n",
+			variant->clk_names[0], err);
 		return err;
 	}
 
+	if (variant->clk_names[1]) {
+		pdata->pclk = devm_clk_get(dev, variant->clk_names[1]);
+		if (IS_ERR(pdata->pclk)) {
+			dev_err(dev, "failed to find clock %s\n",
+				variant->clk_names[1]);
+			err = -ENOENT;
+			goto err_clk;
+		}
+
+		err = clk_prepare_enable(pdata->pclk);
+		if (err < 0) {
+			dev_err(dev, "Enabling clock %s failed, err %d\n",
+				variant->clk_names[0], err);
+			goto err_clk;
+		}
+	} else {
+		pdata->pclk = NULL;
+	}
+
 	spin_lock_init(&pdata->lock);
 	spin_lock_init(&pdata->hash_lock);
 
@@ -2295,8 +2331,11 @@ static int s5p_aes_probe(struct platform_device *pdev)
 	tasklet_kill(&pdata->tasklet);
 
 err_irq:
-	clk_disable_unprepare(pdata->clk);
+	if (pdata->pclk)
+		clk_disable_unprepare(pdata->pclk);
 
+err_clk:
+	clk_disable_unprepare(pdata->clk);
 	s5p_dev = NULL;
 
 	return err;
@@ -2323,6 +2362,9 @@ static int s5p_aes_remove(struct platform_device *pdev)
 		pdata->use_hash = false;
 	}
 
+	if (pdata->pclk)
+		clk_disable_unprepare(pdata->pclk);
+
 	clk_disable_unprepare(pdata->clk);
 	s5p_dev = NULL;
 
-- 
2.20.0