Add i.MX7 PSCI system reset support, linux kernel can use "reboot" command to reset system even wdog driver is disabled in kernel.
Signed-off-by: Anson Huang Anson.Huang@nxp.com --- arch/arm/mach-imx/mx7/psci-mx7.c | 15 ++++++++++++++- arch/arm/mach-imx/mx7/psci.S | 7 +++++++ 2 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/mx7/psci-mx7.c b/arch/arm/mach-imx/mx7/psci-mx7.c index 7f429b0..b26be89 100644 --- a/arch/arm/mach-imx/mx7/psci-mx7.c +++ b/arch/arm/mach-imx/mx7/psci-mx7.c @@ -10,7 +10,7 @@ #include <asm/secure.h> #include <asm/arch/imx-regs.h> #include <common.h> - +#include <fsl_wdog.h>
#define GPC_CPU_PGC_SW_PDN_REQ 0xfc #define GPC_CPU_PGC_SW_PUP_REQ 0xf0 @@ -26,6 +26,9 @@ #define BP_SRC_A7RCR0_A7_CORE_RESET0 0 #define BP_SRC_A7RCR1_A7_CORE1_ENABLE 1
+#define CCM_ROOT_WDOG 0xbb80 +#define CCM_CCGR_WDOG1 0x49c0 + static inline void imx_gpcv2_set_m_core_pgc(bool enable, u32 offset) { writel(enable, GPC_IPS_BASE_ADDR + offset); @@ -74,3 +77,13 @@ __secure int imx_cpu_off(int cpu) writel(0, SRC_BASE_ADDR + cpu * 8 + SRC_GPR1_MX7D + 4); return 0; } + +__secure void imx_system_reset(void) +{ + struct wdog_regs *wdog = (struct wdog_regs *)WDOG1_BASE_ADDR; + + /* make sure WDOG1 clock is enabled */ + writel(0x1 << 28, CCM_BASE_ADDR + CCM_ROOT_WDOG); + writel(0x3, CCM_BASE_ADDR + CCM_CCGR_WDOG1); + writew(WCR_WDE, &wdog->wcr); +} diff --git a/arch/arm/mach-imx/mx7/psci.S b/arch/arm/mach-imx/mx7/psci.S index fc5eb34..e23db24 100644 --- a/arch/arm/mach-imx/mx7/psci.S +++ b/arch/arm/mach-imx/mx7/psci.S @@ -43,4 +43,11 @@ psci_cpu_off: 1: wfi b 1b
+.globl psci_system_reset +psci_system_reset: + bl imx_system_reset + +2: wfi + b 2b + .popsection