Re: [PATCHv2] ARM: OMAP2+: Add support for thumb mode on DT booted N900

[Pali RohÃr]

2014-02-17 22:30 GMT+01:00 Sebastian Reichel <sre@xxxxxxxxxx>:
> Without enabling the workaround for ARM errata 430973 thumb
> compiled userland crashes randomly on the Nokia N900.
>
> Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
> Reviewed-by: Pavel Machek <pavel@xxxxxx>
> ---
> Hi,
>
> This is PATCHv2 for the thumb errata workaround for N900 DT
> boot, which should go into 3.14-rc.
>
> Changes since PATCHv1:
>  * Add Reviewed-By: Pavel Machek
>  * Add more verbose warning about the errata as suggested by Pavel
>
> I did not increase the verbose level, since the next higher verbose
> level is pr_err and the message is not an error.
>
> I think it would make sense to update the Kconfig entry for the errata to
> enable the workaround by default for the Nokia N900. That should be done in
> its own patch, though.
>
> Apart from that it would be nice if errata workaround could be enabled
> via DeviceTree instead of kernel configuration. This will require some
> discussion though, so I think we should start with this patch for now.
>
> -- Sebastian
> ---
>  arch/arm/mach-omap2/pdata-quirks.c | 20 +++++++++++++++++++-
>  1 file changed, 19 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
> index 3d5b24d..0cc710d 100644
> --- a/arch/arm/mach-omap2/pdata-quirks.c
> +++ b/arch/arm/mach-omap2/pdata-quirks.c
> @@ -22,6 +22,8 @@
>  #include "common-board-devices.h"
>  #include "dss-common.h"
>  #include "control.h"
> +#include "omap-secure.h"
> +#include "soc.h"
>
>  struct pdata_init {
>         const char *compatible;
> @@ -169,6 +171,22 @@ static void __init am3517_evm_legacy_init(void)
>         omap_ctrl_writel(v, AM35XX_CONTROL_IP_SW_RESET);
>         omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET); /* OCP barrier */
>  }
> +
> +static void __init nokia_n900_legacy_init(void)
> +{
> +       hsmmc2_internal_input_clk();
> +
> +       if (omap_type() == OMAP2_DEVICE_TYPE_SEC) {
> +               if (IS_ENABLED(CONFIG_ARM_ERRATA_430973)) {
> +                       pr_info("RX-51: Enabling ARM errata 430973 workaround\n");
> +                       /* set IBE to 1 */
> +                       rx51_secure_update_aux_cr(BIT(6), 0);
> +               } else {
> +                       pr_warning("RX-51: Not enabling ARM errata 430973 workaround\n");
> +                       pr_warning("Thumb binaries may crash randomly without this workaround\n");
> +               }
> +       }
> +}
>  #endif /* CONFIG_ARCH_OMAP3 */
>
>  #ifdef CONFIG_ARCH_OMAP4
> @@ -259,7 +277,7 @@ struct of_dev_auxdata omap_auxdata_lookup[] __initdata = {
>  static struct pdata_init pdata_quirks[] __initdata = {
>  #ifdef CONFIG_ARCH_OMAP3
>         { "compulab,omap3-sbc-t3730", omap3_sbc_t3730_legacy_init, },
> -       { "nokia,omap3-n900", hsmmc2_internal_input_clk, },
> +       { "nokia,omap3-n900", nokia_n900_legacy_init, },
>         { "nokia,omap3-n9", hsmmc2_internal_input_clk, },
>         { "nokia,omap3-n950", hsmmc2_internal_input_clk, },
>         { "isee,omap3-igep0020", omap3_igep0020_legacy_init, },
> --
> 1.8.5.3
>

Hello,

now when this patch was accepted and there is secure code for rx51,
what about adding hwrng secure code?
Non DT version is here:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2065e2b5bb3ec986f0f3ba044a81a136767d0b4
I think it could be simple to register needed driver when omap type is
OMAP2_DEVICE_TYPE_SEC.

-- 
Pali RohÃr
pali.rohar@xxxxxxxxx
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