[U-Boot] [PATCH v2] arm: psci: make psci usable on single core socs

[York Sun <york.sun@nxp.com>]

On 04/12/2017 08:29 PM, Yuantian Tang wrote:
> PSCI can be used on both multiple and single core socs. Current
> implementation only allows PSCI to work on multiple core socs.
> This patch removes this restriction so that PSCI can work on
> single core socs as well.
>
> Signed-off-by: Chenhui Zhao <chenhui.zhao@nxp.com>
> Signed-off-by: Tang Yuantian <andy.tang@nxp.com>
> ---
> v2:
> 	- refine the title and commit message
>
>  arch/arm/cpu/armv8/cpu-dt.c                   | 13 +++-------
>  arch/arm/cpu/armv8/fsl-layerscape/cpu.c       | 35 ++++++++++++---------------
>  arch/arm/cpu/armv8/sec_firmware.c             |  2 +-
>  arch/arm/include/asm/arch-fsl-layerscape/mp.h |  4 +++
>  arch/arm/include/asm/armv8/sec_firmware.h     |  7 ++++++
>  5 files changed, 31 insertions(+), 30 deletions(-)
>
> diff --git a/arch/arm/cpu/armv8/cpu-dt.c b/arch/arm/cpu/armv8/cpu-dt.c
> index 5156a15..e3c8aa2 100644
> --- a/arch/arm/cpu/armv8/cpu-dt.c
> +++ b/arch/arm/cpu/armv8/cpu-dt.c
> @@ -7,25 +7,19 @@
>  #include <common.h>
>  #include <asm/psci.h>
>  #include <asm/system.h>
> -#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
>  #include <asm/armv8/sec_firmware.h>
> -#endif
>
> +#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
>  int psci_update_dt(void *fdt)
>  {
> -#ifdef CONFIG_MP
> -#if defined(CONFIG_ARMV8_PSCI) || defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
> -
> -#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
>  	/*
>  	 * If the PSCI in SEC Firmware didn't work, avoid to update the
>  	 * device node of PSCI. But still return 0 instead of an error
>  	 * number to support detecting PSCI dynamically and then switching
>  	 * the SMP boot method between PSCI and spin-table.
>  	 */
> -	if (sec_firmware_support_psci_version() == 0xffffffff)
> +	if (sec_firmware_support_psci_version() == PSCI_INVALID_VER)
>  		return 0;
> -#endif
>  	fdt_psci(fdt);
>
>  #if defined(CONFIG_ARMV8_PSCI) && !defined(CONFIG_ARMV8_SECURE_BASE)
> @@ -34,7 +28,6 @@ int psci_update_dt(void *fdt)
>  			__secure_end - __secure_start);
>  #endif
>
> -#endif
> -#endif
>  	return 0;
>  }
> +#endif
> diff --git a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
> index ea6c090..ccddd49 100644
> --- a/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
> +++ b/arch/arm/cpu/armv8/fsl-layerscape/cpu.c
> @@ -14,18 +14,14 @@
>  #include <asm/arch/soc.h>
>  #include <asm/arch/cpu.h>
>  #include <asm/arch/speed.h>
> -#ifdef CONFIG_MP
>  #include <asm/arch/mp.h>
> -#endif
>  #include <efi_loader.h>
>  #include <fm_eth.h>
>  #include <fsl-mc/fsl_mc.h>
>  #ifdef CONFIG_FSL_ESDHC
>  #include <fsl_esdhc.h>
>  #endif
> -#ifdef CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT
>  #include <asm/armv8/sec_firmware.h>
> -#endif
>  #ifdef CONFIG_SYS_FSL_DDR
>  #include <fsl_ddr.h>
>  #endif
> @@ -474,13 +470,19 @@ int cpu_eth_init(bd_t *bis)
>  	return error;
>  }
>
> -int arch_early_init_r(void)
> +static inline int check_psci(void)
>  {
> -#ifdef CONFIG_MP
> -	int rv = 1;
> -	u32 psci_ver = 0xffffffff;
> -#endif
> +	unsigned int psci_ver;
>
> +	psci_ver = sec_firmware_support_psci_version();
> +	if (psci_ver == PSCI_INVALID_VER)
> +		return 1;
> +
> +	return 0;
> +}
> +
> +int arch_early_init_r(void)
> +{
>  #ifdef CONFIG_SYS_FSL_ERRATUM_A009635
>  	u32 svr_dev_id;
>  	/*
> @@ -494,18 +496,13 @@ int arch_early_init_r(void)
>  #if defined(CONFIG_SYS_FSL_ERRATUM_A009942) && defined(CONFIG_SYS_FSL_DDR)
>  	erratum_a009942_check_cpo();
>  #endif
> -#ifdef CONFIG_MP
> -#if defined(CONFIG_ARMV8_SEC_FIRMWARE_SUPPORT) && \
> -	defined(CONFIG_SEC_FIRMWARE_ARMV8_PSCI)
> -	/* Check the psci version to determine if the psci is supported */
> -	psci_ver = sec_firmware_support_psci_version();
> -#endif
> -	if (psci_ver == 0xffffffff) {
> -		rv = fsl_layerscape_wake_seconday_cores();
> -		if (rv)
> +	if (check_psci()) {
> +		printf("PSCI: PSCI does not exist.\n");
> +

Do you really need this message? You would see the number of cores up if 
spin table is used. If you really want this message, can you change this 
to debug()?

The rest of this patch is OK.

York