[PATCH 6/7] ARM: i.MX93: add scratch space support

[Marco Felsch]

On 24-01-19, Sascha Hauer wrote:
> With upcoming i.MX93 OP-TEE support we'll need to transport the OP-TEE
> base address from PBL to barebox proper. Add scratch space support for
> i.MX93 to accommodate this.
> 
> Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>

Reviewed-by: Marco Felsch <m.felsch at pengutronix.de>

> ---
>  arch/arm/mach-imx/atf.c     |  2 ++
>  arch/arm/mach-imx/esdctl.c  |  2 ++
>  arch/arm/mach-imx/scratch.c | 11 +++++++++++
>  include/mach/imx/scratch.h  |  1 +
>  4 files changed, 16 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/atf.c b/arch/arm/mach-imx/atf.c
> index d334c902b2..148de8f448 100644
> --- a/arch/arm/mach-imx/atf.c
> +++ b/arch/arm/mach-imx/atf.c
> @@ -384,6 +384,8 @@ void __noreturn imx93_load_and_start_image_via_tfa(void)
>  	const void *tfa;
>  	size_t tfa_size;
>  
> +	imx93_init_scratch_space(true);
> +
>  	/*
>  	 * On completion the TF-A will jump to MX93_ATF_BL33_BASE_ADDR
>  	 * in EL2. Copy the image there, but replace the PBL part of
> diff --git a/arch/arm/mach-imx/esdctl.c b/arch/arm/mach-imx/esdctl.c
> index 9c2c4b105d..0dbf0f7242 100644
> --- a/arch/arm/mach-imx/esdctl.c
> +++ b/arch/arm/mach-imx/esdctl.c
> @@ -1047,6 +1047,8 @@ void __noreturn imx7d_barebox_entry(void *boarddata)
>  
>  void __noreturn imx93_barebox_entry(void *boarddata)
>  {
> +	imx93_init_scratch_space(false);
> +
>  	barebox_arm_entry(MX9_DDR_CSD1_BASE_ADDR,
>  			  imx9_ddrc_sdram_size(), boarddata);
>  }
> diff --git a/arch/arm/mach-imx/scratch.c b/arch/arm/mach-imx/scratch.c
> index 117b2eadbf..60d15a4f1a 100644
> --- a/arch/arm/mach-imx/scratch.c
> +++ b/arch/arm/mach-imx/scratch.c
> @@ -5,6 +5,7 @@
>  #include <linux/err.h>
>  #include <linux/printk.h>
>  #include <mach/imx/imx8m-regs.h>
> +#include <mach/imx/imx9-regs.h>
>  #include <mach/imx/esdctl.h>
>  #include <mach/imx/scratch.h>
>  #include <memory.h>
> @@ -30,6 +31,16 @@ void imx8m_init_scratch_space(int ddr_buswidth, bool zero_init)
>  		memset(scratch, 0, sizeof(*scratch));
>  }
>  
> +void imx93_init_scratch_space(bool zero_init)
> +{
> +	ulong endmem = MX9_DDR_CSD1_BASE_ADDR + imx9_ddrc_sdram_size();
> +
> +	scratch = (void *)arm_mem_scratch(endmem);
> +
> +	if (zero_init)
> +		memset(scratch, 0, sizeof(*scratch));
> +}
> +
>  void imx8m_scratch_save_bootrom_log(const u32 *rom_log)
>  {
>  	size_t sz = sizeof(scratch->bootrom_log);
> diff --git a/include/mach/imx/scratch.h b/include/mach/imx/scratch.h
> index b1bb2e446e..6c2cecabcd 100644
> --- a/include/mach/imx/scratch.h
> +++ b/include/mach/imx/scratch.h
> @@ -4,6 +4,7 @@
>  #define __MACH_IMX_SCRATCH_H
>  
>  void imx8m_init_scratch_space(int ddr_buswidth, bool zero_init);
> +void imx93_init_scratch_space(bool zero_init);
>  
>  const u32 *imx8m_scratch_get_bootrom_log(void);
>  void imx8m_scratch_save_bootrom_log(const u32 *rom_log);
> -- 
> 2.39.2
> 
> 
>