[U-Boot] [PATCH V3 3/3] imx: mx7: psci: add system power off support

[Stefano Babic]

On 07/01/2018 07:34, Anson Huang wrote:
> Add i.MX7 PSCI system power off support, linux
> kernel can use "poweroff" command to power off
> system via SNVS, PMIC power will be disabled.
> 
> Signed-off-by: Anson Huang <Anson.Huang at nxp.com>
> ---
>  arch/arm/mach-imx/mx7/psci-mx7.c | 18 ++++++++++++++++++
>  arch/arm/mach-imx/mx7/psci.S     |  7 +++++++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/arch/arm/mach-imx/mx7/psci-mx7.c b/arch/arm/mach-imx/mx7/psci-mx7.c
> index b26be89..d5db511 100644
> --- a/arch/arm/mach-imx/mx7/psci-mx7.c
> +++ b/arch/arm/mach-imx/mx7/psci-mx7.c
> @@ -26,6 +26,12 @@
>  #define BP_SRC_A7RCR0_A7_CORE_RESET0	0
>  #define BP_SRC_A7RCR1_A7_CORE1_ENABLE	1
>  
> +#define SNVS_LPCR		0x38
> +#define BP_SNVS_LPCR_DP_EN	0x20
> +#define BP_SNVS_LPCR_TOP	0x40
> +
> +#define CCM_CCGR_SNVS		0x4250
> +
>  #define CCM_ROOT_WDOG		0xbb80
>  #define CCM_CCGR_WDOG1		0x49c0
>  
> @@ -87,3 +93,15 @@ __secure void imx_system_reset(void)
>  	writel(0x3, CCM_BASE_ADDR + CCM_CCGR_WDOG1);
>  	writew(WCR_WDE, &wdog->wcr);
>  }
> +
> +__secure void imx_system_off(void)
> +{
> +	u32 val;
> +
> +	/* make sure SNVS clock is enabled */
> +	writel(0x3, CCM_BASE_ADDR + CCM_CCGR_SNVS);
> +
> +	val = readl(SNVS_BASE_ADDR + SNVS_LPCR);
> +	val |= BP_SNVS_LPCR_DP_EN | BP_SNVS_LPCR_TOP;
> +	writel(val, SNVS_BASE_ADDR + SNVS_LPCR);
> +}
> diff --git a/arch/arm/mach-imx/mx7/psci.S b/arch/arm/mach-imx/mx7/psci.S
> index e23db24..bc2cd8a 100644
> --- a/arch/arm/mach-imx/mx7/psci.S
> +++ b/arch/arm/mach-imx/mx7/psci.S
> @@ -50,4 +50,11 @@ psci_system_reset:
>  2: 	wfi
>  	b 2b
>  
> +.globl psci_system_off
> +psci_system_off:
> +	bl	imx_system_off
> +
> +3: 	wfi
> +	b 3b
> +
>  	.popsection
> 

Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic


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