linux-kernel - Re: [RESEND][PATCH 3/7] nvmem: imx-ocotp: Add support for banked OTP addressing

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:   Thu, 05 Oct 2017 12:32:11 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Bryan O'Donoghue <pure.logic@...us-software.ie>,
        richard.leitner@...data.com, srinivas.kandagatla@...aro.org,
        axel.lin@...ics.com, ping.bai@....com, d.schultz@...tec.de,
        peng.fan@....com, van.freenix@...il.com
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RESEND][PATCH 3/7] nvmem: imx-ocotp: Add support for banked
 OTP addressing

On Wed, 2017-10-04 at 23:25 +0100, Bryan O'Donoghue wrote:
> The i.MX7S/D takes the bank address in the CTRLn.ADDR field and the
> data
> value in one of the DATAx {0, 1, 2, 3} register fields. The current
> write
> routine is based on writing the CTRLn.ADDR field and writing a single
> DATA
> register only.
> 
> Fixes: 0642bac7da42 ("nvmem: imx-ocotp: add write support")
> 
> Signed-off-by: Bryan O'Donoghue <pure.logic@...us-software.ie>
> ---
>  drivers/nvmem/imx-ocotp.c | 71
> +++++++++++++++++++++++++++++++++++++++++------
>  1 file changed, 62 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/nvmem/imx-ocotp.c b/drivers/nvmem/imx-ocotp.c
> index fed76a4..8034937 100644
> --- a/drivers/nvmem/imx-ocotp.c
> +++ b/drivers/nvmem/imx-ocotp.c
> @@ -40,7 +40,10 @@
>  #define IMX_OCOTP_ADDR_CTRL_SET		0x0004
>  #define IMX_OCOTP_ADDR_CTRL_CLR		0x0008
>  #define IMX_OCOTP_ADDR_TIMING		0x0010
> -#define IMX_OCOTP_ADDR_DATA		0x0020
> +#define IMX_OCOTP_ADDR_DATA0		0x0020
> +#define IMX_OCOTP_ADDR_DATA1		0x0030
> +#define IMX_OCOTP_ADDR_DATA2		0x0040
> +#define IMX_OCOTP_ADDR_DATA3		0x0050
>  
>  #define IMX_OCOTP_BM_CTRL_ADDR		0x0000007F
>  #define IMX_OCOTP_BM_CTRL_BUSY		0x00000100
> @@ -55,6 +58,8 @@ static DEFINE_MUTEX(ocotp_mutex);
>  
>  struct octp_params {
>  	unsigned int nregs;
> +	bool banked;
> +	unsigned int regs_per_bank;
>  };

Instead of the separate banked parameter you could just use
(regs_per_bank != 0).

regards
Philipp