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imx: mx7: psci: add system power off support

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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@nxp.com>
This commit is contained in:
Anson Huang 2018-01-07 14:34:32 +08:00 committed by Stefano Babic
parent 169c20e903
commit 4f0cd03723
2 changed files with 25 additions and 0 deletions
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18
arch/arm/mach-imx/mx7/psci-mx7.c
View File

@ -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);
}

7
arch/arm/mach-imx/mx7/psci.S
View File

@ -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