linux-kernel - Re: [RFC PATCH 04/10] dma-engine: sun4i: Add support for Allwinner suniv F1C100s

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 3 Dec 2018 12:00:51 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Mesih Kilinc <mesihkilinc@...il.com>
Cc:     dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org, linux-sunxi@...glegroups.com,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: Re: [RFC PATCH 04/10] dma-engine: sun4i: Add support for Allwinner
 suniv F1C100s

On Mon, Dec 03, 2018 at 12:23:11AM +0300, Mesih Kilinc wrote:
> DMA of Allwinner suniv F1C100s is similar to sun4i. It has 4 NDMA, 4
> DDMA channels and endpoints are different. Also F1C100s has reset bit
> for DMA in CCU. Add support for it.
> 
> Signed-off-by: Mesih Kilinc <mesihkilinc@...il.com>
> ---
>  drivers/dma/Kconfig     |  4 ++--
>  drivers/dma/sun4i-dma.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 62 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index de511db..f8a65d2 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -163,8 +163,8 @@ config DMA_SA11X0
>  
>  config DMA_SUN4I
>  	tristate "Allwinner A10 DMA SoCs support"
> -	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
> -	default (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I)
> +	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNIV
> +	default (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUNIV)
>  	select DMA_ENGINE
>  	select DMA_VIRTUAL_CHANNELS
>  	help
> diff --git a/drivers/dma/sun4i-dma.c b/drivers/dma/sun4i-dma.c
> index d267ff9..c0452c9 100644
> --- a/drivers/dma/sun4i-dma.c
> +++ b/drivers/dma/sun4i-dma.c
> @@ -36,7 +36,11 @@
>  #define SUN4I_DMA_CFG_SRC_ADDR_MODE(mode)	((mode) << 5)
>  #define SUN4I_DMA_CFG_SRC_DRQ_TYPE(type)	(type)
>  
> +#define SUNIV_DMA_CFG_DST_DATA_WIDTH(width)	((width) << 24)
> +#define SUNIV_DMA_CFG_SRC_DATA_WIDTH(width)	((width) << 8)
> +
>  #define SUN4I_MAX_BURST	8
> +#define SUNIV_MAX_BURST	4
>  
>  /** Normal DMA register values **/
>  
> @@ -44,6 +48,9 @@
>  #define SUN4I_NDMA_DRQ_TYPE_SDRAM		0x16
>  #define SUN4I_NDMA_DRQ_TYPE_LIMIT		(0x1F + 1)
>  
> +#define SUNIV_NDMA_DRQ_TYPE_SDRAM		0x11
> +#define SUNIV_NDMA_DRQ_TYPE_LIMIT		(0x17 + 1)

Also, you're not using that define anywhere

> +
>  /** Normal DMA register layout **/
>  
>  /* Dedicated DMA source/destination address mode values */
> @@ -57,6 +64,9 @@
>  #define SUN4I_NDMA_CFG_BYTE_COUNT_MODE_REMAIN	BIT(15)
>  #define SUN4I_NDMA_CFG_SRC_NON_SECURE		BIT(6)
>  
> +#define SUNIV_NDMA_CFG_CONT_MODE		BIT(29)
> +#define SUNIV_NDMA_CFG_WAIT_STATE(n)		((n) << 26)
> +

Or those two.

>  /** Dedicated DMA register values **/
>  
>  /* Dedicated DMA source/destination address mode values */
> @@ -69,6 +79,9 @@
>  #define SUN4I_DDMA_DRQ_TYPE_SDRAM		0x1
>  #define SUN4I_DDMA_DRQ_TYPE_LIMIT		(0x1F + 1)
>  
> +#define SUNIV_DDMA_DRQ_TYPE_SDRAM		0x1

This is the same value

> +#define SUNIV_DDMA_DRQ_TYPE_LIMIT		(0x9 + 1)
> +

And this one isn't used

>  /** Dedicated DMA register layout **/
>  
>  /* Dedicated DMA configuration register layout */
> @@ -122,6 +135,11 @@
>  #define SUN4I_DMA_NR_MAX_VCHANS						\
>  	(SUN4I_NDMA_NR_MAX_VCHANS + SUN4I_DDMA_NR_MAX_VCHANS)
>  
> +#define SUNIV_NDMA_NR_MAX_CHANNELS	4
> +#define SUNIV_DDMA_NR_MAX_CHANNELS	4
> +#define SUNIV_NDMA_NR_MAX_VCHANS	(24 * 2 - 1)
> +#define SUNIV_DDMA_NR_MAX_VCHANS	10
> +

I'm not sure we need those, you can just use the raw value in the
structure.

Also, how was the number of vchans calculated?

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Download attachment "signature.asc" of type "application/pgp-signature" (229 bytes)