[PATCH] ARM: bcm: Make secure API call optional
Christian Daudt
csd at broadcom.com
Tue Aug 20 13:27:18 EDT 2013
On 13-08-08 12:19 PM, Christian Daudt wrote:
> The current bcm_kona_smc_init function throws a BUG_ON if there's no SMC
> device node defined in the device tree.
>
> Since secure API access is optional depending the chip configuration,
> fix this by allowing the rest of the code to run even if there's no SMC
> device node defined
>
> Reviewed-by: Markus Mayer <markus.mayer at linaro.org>
> Signed-off-by: Christian Daudt <csd at broadcom.com>
>
> diff --git a/arch/arm/mach-bcm/bcm_kona_smc.c b/arch/arm/mach-bcm/bcm_kona_smc.c
> index 56d9d19..e32c1b3 100644
> --- a/arch/arm/mach-bcm/bcm_kona_smc.c
> +++ b/arch/arm/mach-bcm/bcm_kona_smc.c
> @@ -41,13 +41,14 @@ static const struct of_device_id bcm_kona_smc_ids[] __initconst = {
> };
>
> /* Map in the bounce area */
> -void __init bcm_kona_smc_init(void)
> +int __init bcm_kona_smc_init(void)
> {
> struct device_node *node;
>
> /* Read buffer addr and size from the device tree node */
> node = of_find_matching_node(NULL, bcm_kona_smc_ids);
> - BUG_ON(!node);
> + if (!node)
> + return -ENODEV;
>
> /* Don't care about size or flags of the DT node */
> bridge_data.buffer_addr =
> @@ -59,7 +60,9 @@ void __init bcm_kona_smc_init(void)
>
> bridge_data.initialized = 1;
>
> - pr_info("Secure API initialized!\n");
> + pr_info("Kona Secure API initialized\n");
> +
> + return 0;
> }
>
> /* __bcm_kona_smc() should only run on CPU 0, with pre-emption disabled */
> diff --git a/arch/arm/mach-bcm/bcm_kona_smc.h b/arch/arm/mach-bcm/bcm_kona_smc.h
> index 3bedbed1..d098a7e 100644
> --- a/arch/arm/mach-bcm/bcm_kona_smc.h
> +++ b/arch/arm/mach-bcm/bcm_kona_smc.h
> @@ -64,7 +64,7 @@
> #define SSAPI_BRCM_START_VC_CORE 0x0E000008
>
> #ifndef __ASSEMBLY__
> -extern void bcm_kona_smc_init(void);
> +extern int __init bcm_kona_smc_init(void);
>
> extern unsigned bcm_kona_smc(unsigned service_id,
> unsigned arg0,
> diff --git a/arch/arm/mach-bcm/board_bcm.c b/arch/arm/mach-bcm/board_bcm.c
> index 2859932..70cc44f 100644
> --- a/arch/arm/mach-bcm/board_bcm.c
> +++ b/arch/arm/mach-bcm/board_bcm.c
> @@ -29,15 +29,18 @@ static int __init kona_l2_cache_init(void)
> if (!IS_ENABLED(CONFIG_CACHE_L2X0))
> return 0;
>
> + if (bcm_kona_smc_init() < 0) {
> + pr_info("Kona secure API not available. Skipping L2 init\n");
> + return 0;
> + }
> +
> bcm_kona_smc(SSAPI_ENABLE_L2_CACHE, 0, 0, 0, 0);
>
> /*
> * The aux_val and aux_mask have no effect since L2 cache is already
> * enabled. Pass 0s for aux_val and 1s for aux_mask for default value.
> */
> - l2x0_of_init(0, ~0);
> -
> - return 0;
> + return l2x0_of_init(0, ~0);
> }
>
> static void __init board_init(void)
> @@ -45,8 +48,6 @@ static void __init board_init(void)
> of_platform_populate(NULL, of_default_bus_match_table, NULL,
> &platform_bus);
>
> - bcm_kona_smc_init();
> -
> kona_l2_cache_init();
> }
>
applied to bcm/for-3.12/soc
thanks,
csd
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