u-boot/arch/arm/cpu/armv7/mx7/psci-mx7.c

#include <asm/io.h>
#include <asm/psci.h>
#include <asm/arch/imx-regs.h>
#include <common.h>

#define __secure __attribute__((section("._secure.text")))

#define GPC_CPU_PGC_SW_PDN_REQ	0xfc
#define GPC_CPU_PGC_SW_PUP_REQ	0xf0
#define GPC_PGC_C1		0x840

#define BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7	0x2

/* below is for i.MX7D */
#define SRC_GPR1_MX7D		0x074
#define SRC_A7RCR0		0x004
#define SRC_A7RCR1		0x008

#define BP_SRC_A7RCR0_A7_CORE_RESET0	0
#define BP_SRC_A7RCR1_A7_CORE1_ENABLE	1

static inline void imx_gpcv2_set_m_core_pgc(bool enable, u32 offset)
{
	writel(enable, GPC_IPS_BASE_ADDR + offset);
}

__secure void imx_gpcv2_set_core1_power(bool pdn)
{
	u32 reg = pdn ? GPC_CPU_PGC_SW_PUP_REQ : GPC_CPU_PGC_SW_PDN_REQ;
	u32 val;

	imx_gpcv2_set_m_core_pgc(true, GPC_PGC_C1);

	val = readl(GPC_IPS_BASE_ADDR + reg);
	val |= BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7;
	writel(val, GPC_IPS_BASE_ADDR + reg);

	while ((readl(GPC_IPS_BASE_ADDR + reg) &
	       BM_CPU_PGC_SW_PDN_PUP_REQ_CORE1_A7) != 0)
		;

	imx_gpcv2_set_m_core_pgc(false, GPC_PGC_C1);
}

__secure void imx_enable_cpu_ca7(int cpu, bool enable)
{
	u32 mask, val;

	mask = 1 << (BP_SRC_A7RCR1_A7_CORE1_ENABLE + cpu - 1);
	val = readl(SRC_BASE_ADDR + SRC_A7RCR1);
	val = enable ? val | mask : val & ~mask;
	writel(val, SRC_BASE_ADDR + SRC_A7RCR1);
}

__secure int imx_cpu_on(int fn, int cpu, int pc)
{
	writel(pc, SRC_BASE_ADDR + cpu * 8 + SRC_GPR1_MX7D);
	imx_gpcv2_set_core1_power(true);
	imx_enable_cpu_ca7(cpu, true);
	return 0;
}

__secure int imx_cpu_off(int cpu)
{
	imx_enable_cpu_ca7(cpu, false);
	imx_gpcv2_set_core1_power(false);
	writel(0, SRC_BASE_ADDR + cpu * 8 + SRC_GPR1_MX7D + 4);
	return 0;
}