linux-kernel - Re: [PATCH 2/5 v2] ARM: AT91SAM9G45: same platform data structure for all crypto peripherals

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Message-ID: <20121107164523.GG4576@game.jcrosoft.org>
Date:	Wed, 7 Nov 2012 17:45:23 +0100
From:	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To:	Nicolas Royer <nicolas@...rea.com>
Cc:	linux-kernel@...r.kernel.org, nicolas.ferre@...el.com,
	linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
	herbert@...dor.apana.org.au, davem@...emloft.net, eric@...rea.com
Subject: Re: [PATCH 2/5 v2] ARM: AT91SAM9G45: same platform data structure
 for all crypto peripherals

On 17:27 Wed 07 Nov     , Nicolas Royer wrote:
> Only AES use DMA in AT91SAM9G45 (TDES and SHA use PDC).
> 
> However latest Atmel TDES and SHA IP releases use DMA instead of PDC.
>   --> Atmel TDES and SHA drivers need DMA platform data for those IP releases.
> 
> Goal of this patch is to use the same platform data structure for all Atmel
> crypto peripherals. This structure contains information about DMA interface.
> 
> Signed-off-by: Nicolas Royer <nicolas@...rea.com>
> Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
> Acked-by: Eric Bénard <eric@...rea.com>
> Tested-by: Eric Bénard <eric@...rea.com>
> ---
> v2 : check kzalloc return value.
> 
>  arch/arm/mach-at91/at91sam9g45_devices.c   |   10 ++++++----
>  include/linux/platform_data/atmel-aes.h    |   22 ----------------------
>  include/linux/platform_data/crypto-atmel.h |   22 ++++++++++++++++++++++
>  3 files changed, 28 insertions(+), 26 deletions(-)
>  delete mode 100644 include/linux/platform_data/atmel-aes.h
>  create mode 100644 include/linux/platform_data/crypto-atmel.h
> 
> diff --git a/arch/arm/mach-at91/at91sam9g45_devices.c b/arch/arm/mach-at91/at91sam9g45_devices.c
> index fcd233c..c1631d1 100644
> --- a/arch/arm/mach-at91/at91sam9g45_devices.c
> +++ b/arch/arm/mach-at91/at91sam9g45_devices.c
> @@ -18,7 +18,7 @@
>  #include <linux/platform_device.h>
>  #include <linux/i2c-gpio.h>
>  #include <linux/atmel-mci.h>
> -#include <linux/platform_data/atmel-aes.h>
> +#include <linux/platform_data/crypto-atmel.h>
>  
>  #include <linux/platform_data/at91_adc.h>
>  
> @@ -1900,7 +1900,7 @@ static void __init at91_add_device_tdes(void) {}
>   * -------------------------------------------------------------------- */
>  
>  #if defined(CONFIG_CRYPTO_DEV_ATMEL_AES) || defined(CONFIG_CRYPTO_DEV_ATMEL_AES_MODULE)
> -static struct aes_platform_data aes_data;
> +static struct crypto_platform_data aes_data;
>  static u64 aes_dmamask = DMA_BIT_MASK(32);
>  
>  static struct resource aes_resources[] = {
> @@ -1931,9 +1931,11 @@ static struct platform_device at91sam9g45_aes_device = {
>  static void __init at91_add_device_aes(void)
>  {
>  	struct at_dma_slave	*atslave;
> -	struct aes_dma_data	*alt_atslave;
> +	struct crypto_dma_data	*alt_atslave;
>  
> -	alt_atslave = kzalloc(sizeof(struct aes_dma_data), GFP_KERNEL);
> +	alt_atslave = kzalloc(sizeof(struct crypto_dma_data), GFP_KERNEL);
I still not understand why we need to allocate it

just declare it as static

Best Regards,
J.
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