Re: [PATCH 5/5] ARM: mach-imx: tzasc: add imx6q_tzc380_is_enabled

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 6/19/25 17:25, Marco Felsch wrote:
> In preparation of adding an i.MX6QD optee-early helper add a helper to
> check if the early code e.g. PBL/BootROM enabled the TZC380 controllers
> on the i.MX6QDL.
> 
> Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>

Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> ---
>  arch/arm/mach-imx/tzasc.c | 15 +++++++++++++++
>  include/mach/imx/tzasc.h  |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/tzasc.c b/arch/arm/mach-imx/tzasc.c
> index aad6ece64f18..14b72386ad53 100644
> --- a/arch/arm/mach-imx/tzasc.c
> +++ b/arch/arm/mach-imx/tzasc.c
> @@ -76,6 +76,9 @@
>  #define MX6_TZASC1_BASE			0x21d0000
>  #define MX6_TZASC2_BASE			0x21d4000
>  
> +#define MX6_GPR_TZASC1_EN		BIT(0)
> +#define MX6_GPR_TZASC2_EN		BIT(1)
> +
>  #define GPR_TZASC_EN					BIT(0)
>  #define GPR_TZASC_ID_SWAP_BYPASS		BIT(1)
>  #define GPR_TZASC_EN_LOCK				BIT(16)
> @@ -293,6 +296,18 @@ void imx6q_tzc380_early_ns_region1(void)
>  				  TZC380_REGION_SP_NS_RW);
>  }
>  
> +bool imx6q_tzc380_is_enabled(void)
> +{
> +	u32 __iomem *gpr = IOMEM(MX6_IOMUXC_BASE_ADDR);
> +
> +	/*
> +	 * MX6_GPR_TZASC1_EN and MX6_GPR_TZASC2_EN are sticky bits which
> +	 * preserve their values once set until the next power-up cycle.
> +	 */
> +	return (readl(&gpr[9]) & (MX6_GPR_TZASC1_EN | MX6_GPR_TZASC2_EN)) ==
> +	       (MX6_GPR_TZASC1_EN | MX6_GPR_TZASC2_EN);
> +}
> +
>  void imx8m_tzc380_init(void)
>  {
>  	u32 __iomem *gpr = IOMEM(MX8M_IOMUXC_GPR_BASE_ADDR);
> diff --git a/include/mach/imx/tzasc.h b/include/mach/imx/tzasc.h
> index 4d3f26fc82f1..59ec56a5ec60 100644
> --- a/include/mach/imx/tzasc.h
> +++ b/include/mach/imx/tzasc.h
> @@ -7,6 +7,7 @@
>  #include <asm/system.h>
>  
>  void imx6q_tzc380_early_ns_region1(void);
> +bool imx6q_tzc380_is_enabled(void);
>  void imx8m_tzc380_init(void);
>  bool imx8m_tzc380_is_enabled(void);
>  

-- 
Pengutronix e.K.                  |                             |
Steuerwalder Str. 21              | http://www.pengutronix.de/  |
31137 Hildesheim, Germany         | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686  | Fax:   +49-5121-206917-5555 |