Adding upstream version 2.10.0+dfsg.upstream/2.10.0+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1637 insertions, 0 deletions

diff --git a/plat/nxp/soc-ls1043a/aarch64/ls1043a.S b/plat/nxp/soc-ls1043a/aarch64/ls1043a.S
new file mode 100644
index 0000000..a1baf79
--- /dev/null
+++ b/plat/nxp/soc-ls1043a/aarch64/ls1043a.S
@@ -0,0 +1,1637 @@
+/*
+ * Copyright 2018-2021 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <asm_macros.S>
+#include <cortex_a53.h>
+#include <dcfg_lsch2.h>
+#include <plat_gic.h>
+#include <scfg.h>
+
+#include <bl31_data.h>
+#include <plat_psci.h>
+#include <platform_def.h>
+
+/* the BASE address for these offsets is AUX_01_DATA in the */
+/* bootcore's psci data region */
+#define DEVDISR2_MASK_OFFSET	0x0	/* references AUX_01_DATA */
+#define DEVDISR5_MASK_OFFSET	0x8	/* references AUX_02_DATA */
+#define CPUACTLR_DATA_OFFSET	0x10	/* references AUX_03_DATA */
+/* the BASE address for these offsets is AUX_04_DATA in the */
+/* bootcore's psci data region */
+#define GICD_BASE_ADDR_OFFSET	0x0	/* references AUX_04_DATA */
+#define GICC_BASE_ADDR_OFFSET	0x8	/* references AUX_05_DATA */
+
+#define DAIF_DATA AUX_06_DATA	/* references AUX_06_DATA */
+
+#define IPSTPACK_RETRY_CNT	0x10000
+#define DDR_SLEEP_RETRY_CNT	0x10000
+#define CPUACTLR_EL1		S3_1_C15_C2_0
+#define DDR_SDRAM_CFG_2_FRCSR	0x80000000
+#define DDR_SDRAM_CFG_2_OFFSET	0x114
+#define DDR_TIMING_CFG_4_OFFSET	0x160
+#define DDR_CNTRL_BASE_ADDR	0x01080000
+
+#define DLL_LOCK_MASK		0x3
+#define DLL_LOCK_VALUE		0x2
+
+#define ERROR_DDR_SLEEP		-1
+#define ERROR_DDR_WAKE		-2
+#define ERROR_NO_QUIESCE	-3
+
+#define CORE_RESTARTABLE	0
+#define CORE_NOT_RESTARTABLE	1
+
+#define RESET_RETRY_CNT 800
+
+.global soc_init_lowlevel
+.global soc_init_percpu
+.global _soc_core_release
+.global _soc_core_restart
+.global _soc_ck_disabled
+.global _soc_sys_reset
+.global _soc_sys_off
+.global _getGICD_BaseAddr
+.global _getGICC_BaseAddr
+.global _soc_set_start_addr
+.global _soc_core_prep_off
+.global _soc_core_entr_off
+.global _soc_core_exit_off
+.global _soc_core_prep_stdby
+.global _soc_core_entr_stdby
+.global _soc_core_exit_stdby
+.global _soc_core_prep_pwrdn
+.global _soc_core_entr_pwrdn
+.global _soc_core_exit_pwrdn
+.global _soc_clstr_prep_stdby
+.global _soc_clstr_exit_stdby
+.global _soc_clstr_prep_pwrdn
+.global _soc_clstr_exit_pwrdn
+.global _soc_sys_prep_stdby
+.global _soc_sys_exit_stdby
+.global _soc_sys_prep_pwrdn
+.global _soc_sys_pwrdn_wfi
+.global _soc_sys_exit_pwrdn
+
+/*
+ * This function initialize the soc.
+ * in: void
+ * out: void
+ */
+func soc_init_lowlevel
+	ret
+endfunc soc_init_lowlevel
+
+/*
+ * void soc_init_percpu(void)
+ * this function performs any soc-specific initialization that is needed on
+ * a per-core basis
+ * in:  none
+ * out: none
+ * uses x0, x1, x2, x3
+ */
+func soc_init_percpu
+	mov	x3, x30
+
+	bl	plat_my_core_mask
+	mov	x2, x0
+
+	/* see if this core is marked for prefetch disable */
+	mov	x0, #PREFETCH_DIS_OFFSET
+	bl	_get_global_data  /* 0-1 */
+	tst	x0, x2
+	b.eq	1f
+	bl	_disable_ldstr_pfetch_A53  /* 0 */
+1:
+	mov	x30, x3
+	ret
+endfunc soc_init_percpu
+
+/*
+ * part of CPU_ON
+ * this function releases a secondary core from reset
+ * in:   x0 = core_mask_lsb
+ * out:  none
+ * uses: x0, x1, x2, x3
+ */
+_soc_core_release:
+
+#if (TEST_BL31)
+	mov	w2, w0
+	CoreMaskMsb	w2, w3
+	/* x2 = core mask msb */
+#else
+	mov	x2, x0
+#endif
+	/* write COREBCR  */
+	ldr	x1, =NXP_SCFG_ADDR
+	rev	w3, w2
+	str	w3, [x1, #SCFG_COREBCR_OFFSET]
+	isb
+
+	/* read-modify-write BRR */
+	mov	x1, #NXP_DCFG_ADDR
+	ldr	w2, [x1, #DCFG_BRR_OFFSET]
+	rev	w3, w2
+	orr	w3, w3, w0
+	rev	w2, w3
+	str	w2, [x1, #DCFG_BRR_OFFSET]
+	isb
+
+	/* send event */
+	sev
+	isb
+	ret
+
+
+/*
+ * part of CPU_ON
+ * this function restarts a core shutdown via _soc_core_entr_off
+ * in:  x0 = core mask lsb (of the target cpu)
+ * out: x0 == 0, on success
+ *      x0 != 0, on failure
+ * uses x0 ~ x5
+ */
+_soc_core_restart:
+	mov	x5, x30
+	mov	x3, x0
+
+	/* x3 = core mask lsb */
+	bl	_getGICD_BaseAddr
+	mov	x4, x0
+
+	/* x4 = GICD_BASE_ADDR */
+	/* enable forwarding of group 0 interrupts by setting GICD_CTLR[0] = 1 */
+	ldr	w1, [x4, #GICD_CTLR_OFFSET]
+	orr	w1, w1, #GICD_CTLR_EN_GRP0
+	str	w1, [x4, #GICD_CTLR_OFFSET]
+	dsb	sy
+	isb
+
+	/*
+	 * fire SGI by writing to GICD_SGIR the following values:
+	 * [25:24] = 0x0 (forward interrupt to the CPU interfaces specified in CPUTargetList field)
+	 * [23:16] = core mask lsb[7:0] (forward interrupt to target cpu)
+	 * [15]    = 0 (forward SGI only if it is configured as group 0 interrupt)
+	 * [3:0]   = 0xF (interrupt ID = 15)
+	 */
+	lsl	w1, w3, #16
+	orr	w1, w1, #0xF
+	str	w1, [x4, #GICD_SGIR_OFFSET]
+	dsb	sy
+	isb
+
+	/* load '0' on success */
+	mov	x0, xzr
+
+	mov	x30, x5
+	ret
+
+/*
+ * this function determines if a core is disabled via COREDISR
+ * in:  w0  = core_mask_lsb
+ * out: w0  = 0, core not disabled
+ *      w0 != 0, core disabled
+ * uses x0, x1, x2
+ */
+_soc_ck_disabled:
+
+	/* get base addr of dcfg block */
+	ldr	x1, =NXP_DCFG_ADDR
+
+	/* read COREDISR */
+	ldr	w1, [x1, #DCFG_COREDISR_OFFSET]
+	rev	w2, w1
+
+	/* test core bit */
+	and	w0, w2, w0
+	ret
+
+/*
+ * this function resets the system via SoC-specific methods
+ * in:  none
+ * out: none
+ * uses x0, x1, x2, x3
+ */
+_soc_sys_reset:
+
+	ldr	x2, =NXP_DCFG_ADDR
+
+	/* make sure the mask is cleared in the reset request mask register */
+	mov	w1, wzr
+	str	w1, [x2, #DCFG_RSTRQMR1_OFFSET]
+
+	/* x2 = NXP_DCFG_ADDR */
+
+	/* set the reset request */
+	ldr	w1, =RSTCR_RESET_REQ
+	ldr	x3, =DCFG_RSTCR_OFFSET
+	rev	w0, w1
+	str	w0, [x2, x3]
+
+	/* x2 = NXP_DCFG_ADDR */
+	/* x3 = DCFG_RSTCR_OFFSET */
+
+	/* just in case this address range is mapped as cacheable,
+	 * flush the write out of the dcaches */
+	add	x3, x2, x3
+	dc	cvac, x3
+	dsb	st
+	isb
+
+	/* Note: this function does not return */
+1:
+	wfi
+	b  1b
+
+
+/*
+ * part of SYSTEM_OFF
+ * this function turns off the SoC clocks
+ * Note: this function is not intended to return, and the only allowable
+ *       recovery is POR
+ * in:  none
+ * out: none
+ * uses x0 ~ x8
+ */
+_soc_sys_off:
+
+	/* mask interrupts at the core */
+	mrs	x1, DAIF
+	mov	x0, #DAIF_SET_MASK
+	orr	x0, x1, x0
+	msr	DAIF, x0
+
+	/* disable icache, dcache, mmu @ EL1 */
+	mov	x1, #SCTLR_I_C_M_MASK
+	mrs	x0, sctlr_el1
+	bic	x0, x0, x1
+	msr	sctlr_el1, x0
+
+	/* disable dcache for EL3 */
+	mrs	x1, SCTLR_EL3
+	bic	x1, x1, #SCTLR_C_MASK
+	/* make sure icache is enabled */
+	orr	x1, x1, #SCTLR_I_MASK
+	msr	SCTLR_EL3, x1
+	isb
+
+	/* set WFIL2_EN in SCFG_COREPMCR */
+	ldr	x0, =SCFG_COREPMCR_OFFSET
+	ldr	x1, =COREPMCR_WFIL2
+	bl	write_reg_scfg
+
+	/* set OVRD_EN in RCPM2_POWMGTDCR */
+	ldr	x0, =RCPM2_POWMGTDCR_OFFSET
+	ldr	x1, =POWMGTDCR_OVRD_EN
+	bl	write_reg_rcpm2
+
+	/* read IPPDEXPCR0 @ RCPM_IPPDEXPCR0 */
+	ldr	x0, =RCPM_IPPDEXPCR0_OFFSET
+	bl	read_reg_rcpm
+	mov	x7, x0
+
+	/* build an override mask for IPSTPCR4/IPSTPACK4/DEVDISR5 */
+	mov	x5, xzr
+	ldr	x6, =IPPDEXPCR_MASK2
+	and	x6, x6, x7
+	cbz	x6, 1f
+
+	/* x5 = override mask
+	 * x6 = IPPDEXPCR bits for DEVDISR5
+	 * x7 = IPPDEXPCR */
+
+	/* get the overrides */
+	orr	x4, x5, #DEVDISR5_I2C_1
+	tst	x6, #IPPDEXPCR_I2C1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_LPUART1
+	tst	x6, #IPPDEXPCR_LPUART1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_FLX_TMR
+	tst	x6, #IPPDEXPCR_FLX_TMR1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_OCRAM1
+	tst	x6, #IPPDEXPCR_OCRAM1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_GPIO
+	tst	x6, #IPPDEXPCR_GPIO1
+	csel	x5, x5, x4, EQ
+1:
+	/* store the DEVDISR5 override mask */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	str	w5, [x2, #DEVDISR5_MASK_OFFSET]
+
+	/* build an override mask for IPSTPCR1/IPSTPACK1/DEVDISR2 */
+	mov	x5, xzr
+	ldr	x6, =IPPDEXPCR_MASK1
+	and	x6, x6, x7
+	cbz	x6, 2f
+
+	/* x5 = override mask */
+	/* x6 = IPPDEXPCR bits for DEVDISR2 */
+
+	/* get the overrides */
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC1
+	tst	x6, #IPPDEXPCR_MAC1_1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC2
+	tst	x6, #IPPDEXPCR_MAC1_2
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC3
+	tst	x6, #IPPDEXPCR_MAC1_3
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC4
+	tst	x6, #IPPDEXPCR_MAC1_4
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC5
+	tst	x6, #IPPDEXPCR_MAC1_5
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC6
+	tst	x6, #IPPDEXPCR_MAC1_6
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC9
+	tst	x6, #IPPDEXPCR_MAC1_9
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1
+	tst	x6, #IPPDEXPCR_FM1
+	csel	x5, x5, x4, EQ
+
+2:
+	/* store the DEVDISR2 override mask */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	str	w5, [x2, #DEVDISR2_MASK_OFFSET]
+
+	/* x5 = DEVDISR2 override mask */
+
+	/* write IPSTPCR0 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR0_OFFSET
+	ldr	x1, =IPSTPCR0_VALUE
+	bl	write_reg_rcpm2
+
+	/* x5 = DEVDISR2 override mask */
+
+	/* write IPSTPCR1 - overrides possible */
+	ldr	x0, =RCPM2_IPSTPCR1_OFFSET
+	ldr	x1, =IPSTPCR1_VALUE
+	bic	x1, x1, x5
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR2 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR2_OFFSET
+	ldr	x1, =IPSTPCR2_VALUE
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR3 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR3_OFFSET
+	ldr	x1, =IPSTPCR3_VALUE
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR4 - overrides possible */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	ldr	w6, [x2, #DEVDISR5_MASK_OFFSET]
+	ldr	x0, =RCPM2_IPSTPCR4_OFFSET
+	ldr	x1, =IPSTPCR4_VALUE
+	bic	x1, x1, x6
+	bl	write_reg_rcpm2
+
+	/* x5 = DEVDISR2 override mask */
+	/* x6 = DEVDISR5 override mask */
+
+	/* poll on IPSTPACK0 */
+	ldr	x3, =RCPM2_IPSTPACKR0_OFFSET
+	ldr	x4, =IPSTPCR0_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+3:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	14f
+	sub	x7, x7, #1
+	cbnz	x7, 3b
+
+14:
+	/* poll on IPSTPACK1 */
+	ldr	x3, =IPSTPCR1_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+	bic	x4, x3, x5
+	ldr	x3, =RCPM2_IPSTPACKR1_OFFSET
+4:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	15f
+	sub	x7, x7, #1
+	cbnz	x7, 4b
+
+15:
+	/* poll on IPSTPACK2 */
+	ldr	x3, =RCPM2_IPSTPACKR2_OFFSET
+	ldr	x4, =IPSTPCR2_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+5:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	16f
+	sub	x7, x7, #1
+	cbnz	x7, 5b
+
+16:
+	/* poll on IPSTPACK3 */
+	ldr	x3, =RCPM2_IPSTPACKR3_OFFSET
+	ldr	x4, =IPSTPCR3_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+6:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	17f
+	sub	x7, x7, #1
+	cbnz	x7, 6b
+
+17:
+	/* poll on IPSTPACK4 */
+	ldr	x3, =IPSTPCR4_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+	bic	x4, x3, x6
+	ldr	x3, =RCPM2_IPSTPACKR4_OFFSET
+7:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	18f
+	sub	x7, x7, #1
+	cbnz	x7, 7b
+
+18:
+	ldr	x7, =BC_PSCI_BASE
+	add	x7, x7, #AUX_01_DATA
+
+	/* x5 = DEVDISR2 override mask
+	 * x6 = DEVDISR5 override mask
+	 * x7 = [soc_data_area] */
+
+	/* DEVDISR1 - load new value */
+	mov	x0, #DCFG_DEVDISR1_OFFSET
+	bl	read_reg_dcfg
+	mov	x0, #DCFG_DEVDISR1_OFFSET
+	ldr	x1, =DEVDISR1_VALUE
+	bl	write_reg_dcfg
+
+	/* DEVDISR2 - load new value */
+	mov	x0, #DCFG_DEVDISR2_OFFSET
+	bl	read_reg_dcfg
+	mov	x0, #DCFG_DEVDISR2_OFFSET
+	ldr	x1, =DEVDISR2_VALUE
+	bic	x1, x1, x5
+	bl	write_reg_dcfg
+
+	/* x6 = DEVDISR5 override mask */
+	/* x7 = [soc_data_area] */
+
+	/* DEVDISR3 - load new value */
+	mov	x0, #DCFG_DEVDISR3_OFFSET
+	bl	read_reg_dcfg
+	mov	x0, #DCFG_DEVDISR3_OFFSET
+	ldr	x1, =DEVDISR3_VALUE
+	bl	write_reg_dcfg
+
+	/* DEVDISR4 - load new value */
+	mov	x0, #DCFG_DEVDISR4_OFFSET
+	bl	read_reg_dcfg
+	mov	x0, #DCFG_DEVDISR4_OFFSET
+	ldr	x1, =DEVDISR4_VALUE
+	bl	write_reg_dcfg
+
+	/* DEVDISR5 - load new value */
+	mov	x0, #DCFG_DEVDISR5_OFFSET
+	bl	read_reg_dcfg
+	mov	x0, #DCFG_DEVDISR5_OFFSET
+	ldr	x1, =DEVDISR5_VALUE
+	bic	x1, x1, x6
+	bl	write_reg_dcfg
+
+	/* x7 = [soc_data_area] */
+
+	/* disable data prefetch */
+	mrs	x0, CPUACTLR_EL1
+	bic	x0, x0, #CPUACTLR_L1PCTL_MASK
+	msr	CPUACTLR_EL1, x0
+
+	/* x6 = DEVDISR5 override mask */
+
+	/* setup registers for cache-only execution */
+	ldr	x5, =IPSTPCR4_VALUE
+	bic	x5, x5, x6
+	mov	x6, #DDR_CNTRL_BASE_ADDR
+	mov	x7, #DCSR_RCPM2_BASE
+	mov	x8, #NXP_DCFG_ADDR
+	dsb	sy
+	isb
+
+	/* set the DLL_LOCK cycle count */
+	ldr	w1, [x6, #DDR_TIMING_CFG_4_OFFSET]
+	rev	w2, w1
+	bic	w2, w2, #DLL_LOCK_MASK
+	orr	w2, w2, #DLL_LOCK_VALUE
+	rev	w1, w2
+	str	w1, [x6, #DDR_TIMING_CFG_4_OFFSET]
+
+	/* x5  = ipstpcr4 (IPSTPCR4_VALUE bic DEVDISR5_MASK)
+	 * x6  = DDR_CNTRL_BASE_ADDR
+	 * x7  = DCSR_RCPM2_BASE
+	 * x8  = NXP_DCFG_ADDR */
+
+	/* enter the cache-only sequence - there is no return */
+	b	final_shutdown
+
+
+/*
+ * part of CPU_OFF
+ * this function programs SoC & GIC registers in preparation for shutting down
+ * the core
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0 ~ x7
+ */
+_soc_core_prep_off:
+	mov	x7, x30
+	mov	x6, x0
+
+	/* make sure the smpen bit is set */
+	mrs	x2, CORTEX_A53_ECTLR_EL1
+	orr	x2, x2, #CPUECTLR_SMPEN_MASK
+	msr	CORTEX_A53_ECTLR_EL1, x2
+	isb
+
+	/* configure the cpu interface */
+
+	/* disable signaling of ints */
+	bl	_getGICC_BaseAddr  // 0-1
+	mov	x4, x0
+
+	ldr	w3, [x4, #GICC_CTLR_OFFSET]
+	bic	w3, w3, #GICC_CTLR_EN_GRP0
+	bic	w3, w3, #GICC_CTLR_EN_GRP1
+	str	w3, [x4, #GICC_CTLR_OFFSET]
+	dsb	sy
+	isb
+
+	/*
+	 * x3 = GICC_CTRL
+	 * x4 = GICC_BASE_ADDR
+	 * x6 = core mask
+	 */
+
+	/* set the priority filter */
+	ldr	w2, [x4, #GICC_PMR_OFFSET]
+	orr	w2, w2, #GICC_PMR_FILTER
+	str	w2, [x4, #GICC_PMR_OFFSET]
+
+	/* setup GICC_CTLR */
+	bic	w3, w3, #GICC_CTLR_ACKCTL_MASK
+	orr	w3, w3, #GICC_CTLR_FIQ_EN_MASK
+	orr	w3, w3, #GICC_CTLR_EOImodeS_MASK
+	orr	w3, w3, #GICC_CTLR_CBPR_MASK
+	str	w3, [x4, #GICC_CTLR_OFFSET]
+
+	/* x3 = GICC_CTRL */
+	/* x4 = GICC_BASE_ADDR */
+
+	/* setup the banked-per-core GICD registers */
+	bl	_getGICD_BaseAddr
+
+	/*
+	 * x0 = GICD_BASE_ADDR
+	 * x3 = GICC_CTRL
+	 * x4 = GICC_BASE_ADDR
+	 * x6 = core mask
+	 */
+
+	/* define SGI15 as Grp0 */
+	ldr	w2, [x0, #GICD_IGROUPR0_OFFSET]
+	bic	w2, w2, #GICD_IGROUP0_SGI15
+	str	w2, [x0, #GICD_IGROUPR0_OFFSET]
+
+	/* set priority of SGI 15 to highest... */
+	ldr	w2, [x0, #GICD_IPRIORITYR3_OFFSET]
+	bic	w2, w2, #GICD_IPRIORITY_SGI15_MASK
+	str	w2, [x0, #GICD_IPRIORITYR3_OFFSET]
+
+	/* enable SGI 15 */
+	ldr	w2, [x0, #GICD_ISENABLER0_OFFSET]
+	orr	w2, w2, #GICD_ISENABLE0_SGI15
+	str	w2, [x0, #GICD_ISENABLER0_OFFSET]
+
+	/* enable the cpu interface */
+	orr	w3, w3, #GICC_CTLR_EN_GRP0
+	str	w3, [x4, #GICC_CTLR_OFFSET]
+
+	/* x0 = GICD_BASE_ADDR
+	 * x6 = core mask */
+
+	/* clear any pending SGIs */
+	add	x0, x0, #GICD_CPENDSGIR3_OFFSET
+	ldr	x2, =GICD_CPENDSGIR_CLR_MASK
+	str	w2, [x0]
+
+	dsb	sy
+	isb
+	mov	x30, x7
+	ret
+
+/*
+ * part of CPU_OFF
+ * this function performs the final steps to shutdown the core
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0 ~ x5
+ */
+_soc_core_entr_off:
+	mov	x5, x30
+	mov	x4, x0
+
+	bl	_getGICD_BaseAddr
+	mov	x3, x0
+
+	/* x3 = GICD_BASE_ADDR */
+	/* x4 = core mask (lsb) */
+
+3:
+	/* enter low-power state by executing wfi */
+	wfi
+
+	/* x3 = GICD_BASE_ADDR */
+	/* x4 = core mask (lsb) */
+
+	/* see if we got hit by SGI 15 */
+	add	x0, x3, #GICD_SPENDSGIR3_OFFSET
+	ldr	w2, [x0]
+	and	w2, w2, #GICD_SPENDSGIR3_SGI15_MASK
+	cbz	w2, 4f
+
+	/* clear the pending SGI */
+	ldr	x2, =GICD_CPENDSGIR_CLR_MASK
+	add	x0, x3, #GICD_CPENDSGIR3_OFFSET
+	str	w2, [x0]
+4:
+	/* check if core has been turned on */
+	mov	x0, x4
+	bl	_getCoreState
+
+	/* x0 = core state */
+	cmp	x0, #CORE_WAKEUP
+	b.ne	3b
+
+	/* if we get here, then we have exited the wfi */
+	dsb	sy
+	isb
+	mov	x30, x5
+	ret
+
+/*
+ * part of CPU_OFF
+ * this function starts the process of starting a core back up
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0 ~ x5
+ */
+_soc_core_exit_off:
+	mov	x5, x30
+	mov	x4, x0
+
+	/* x4 = core mask */
+
+	bl	_getGICC_BaseAddr
+	mov	x2, x0
+
+	/* read GICC_IAR */
+	ldr	w0, [x2, #GICC_IAR_OFFSET]
+
+	/* write GICC_EIOR - signal end-of-interrupt */
+	str	w0, [x2, #GICC_EOIR_OFFSET]
+
+	/* write GICC_DIR - disable interrupt */
+	str	w0, [x2, #GICC_DIR_OFFSET]
+
+	/* x2 = GICC_BASE_ADDR */
+
+	/* disable signaling of grp0 ints */
+	ldr	w1, [x2, #GICC_CTLR_OFFSET]
+	bic	w1, w1, #GICC_CTLR_EN_GRP0
+	str	w1, [x2, #GICC_CTLR_OFFSET]
+
+	dsb	sy
+	isb
+	mov	x30, x5
+	ret
+
+/*
+ * this function loads a 64-bit execution address of the core in the soc registers
+ * BOOTLOCPTRL/H
+ * in:  x0, 64-bit address to write to BOOTLOCPTRL/H
+ * uses x0, x1, x2, x3
+ */
+_soc_set_start_addr:
+	/* get the 64-bit base address of the scfg block */
+	ldr	x2, =NXP_SCFG_ADDR
+
+	/* write the 32-bit BOOTLOCPTRL register (offset 0x604 in the scfg block) */
+	mov	x1, x0
+	rev	w3, w1
+	str	w3, [x2, #SCFG_BOOTLOCPTRL_OFFSET]
+
+	/* write the 32-bit BOOTLOCPTRH register (offset 0x600 in the scfg block) */
+	lsr	x1, x0, #32
+	rev	w3, w1
+	str	w3, [x2, #SCFG_BOOTLOCPTRH_OFFSET]
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function puts the calling core into standby state
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0
+ */
+_soc_core_entr_stdby:
+	dsb	sy
+	isb
+	wfi
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to standby
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_core_prep_stdby:
+	/* clear CORTEX_A53_ECTLR_EL1[2:0] */
+	mrs	x1, CORTEX_A53_ECTLR_EL1
+	bic	x1, x1, #CPUECTLR_TIMER_MASK
+	msr	CORTEX_A53_ECTLR_EL1, x1
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after standby state
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses none
+ */
+_soc_core_exit_stdby:
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_core_prep_pwrdn:
+	/* make sure the smp bit is set */
+	mrs	x1, CORTEX_A53_ECTLR_EL1
+	orr	x1, x1, #CPUECTLR_SMPEN_MASK
+	msr	CORTEX_A53_ECTLR_EL1, x1
+	isb
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function puts the calling core into a power-down state
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0
+ */
+_soc_core_entr_pwrdn:
+	dsb	sy
+	isb
+	wfi
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses none
+ */
+_soc_core_exit_pwrdn:
+	ret
+
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to standby
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_clstr_prep_stdby:
+	/* clear CORTEX_A53_ECTLR_EL1[2:0] */
+	mrs  x1, CORTEX_A53_ECTLR_EL1
+	bic  x1, x1, #CPUECTLR_TIMER_MASK
+	msr  CORTEX_A53_ECTLR_EL1, x1
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after standby state
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses none
+ */
+_soc_clstr_exit_stdby:
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_clstr_prep_pwrdn:
+	/* make sure the smp bit is set */
+	mrs	x1, CORTEX_A53_ECTLR_EL1
+	orr	x1, x1, #CPUECTLR_SMPEN_MASK
+	msr	CORTEX_A53_ECTLR_EL1, x1
+	isb
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses none
+ */
+_soc_clstr_exit_pwrdn:
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to standby
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_sys_prep_stdby:
+	/* clear CORTEX_A53_ECTLR_EL1[2:0] */
+	mrs  x1, CORTEX_A53_ECTLR_EL1
+	bic  x1, x1, #CPUECTLR_TIMER_MASK
+	msr  CORTEX_A53_ECTLR_EL1, x1
+
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after standby state
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses none
+ */
+_soc_sys_exit_stdby:
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs SoC-specific programming prior to
+ * suspend-to-power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1, x2, x3, x4
+ */
+_soc_sys_prep_pwrdn:
+	mov	x4, x30
+	/* make sure the smp bit is set */
+	mrs	x1, CORTEX_A53_ECTLR_EL1
+	orr	x1, x1, #CPUECTLR_SMPEN_MASK
+	msr	CORTEX_A53_ECTLR_EL1, x1
+	isb
+
+	/* set WFIL2_EN in SCFG_COREPMCR */
+	ldr	x0, =SCFG_COREPMCR_OFFSET
+	ldr	x1, =COREPMCR_WFIL2
+	bl	write_reg_scfg  // 0-3
+
+	/* set OVRD_EN in RCPM2_POWMGTDCR */
+	ldr	x0, =RCPM2_POWMGTDCR_OFFSET
+	ldr	x1, =POWMGTDCR_OVRD_EN
+	bl	write_reg_rcpm2  // 0-3
+
+	mov	x30, x4
+	ret
+/*
+ * part of CPU_SUSPEND
+ * this function puts the calling core, and potentially the soc, into a
+ * low-power state
+ * in:  x0 = core mask lsb
+ * out: x0 = 0, success
+ *      x0 < 0, failure
+ * uses x0 ~ x9
+ */
+_soc_sys_pwrdn_wfi:
+	mov	x18, x30
+
+	/* read IPPDEXPCR0 @ RCPM_IPPDEXPCR0 */
+	ldr	x0, =RCPM_IPPDEXPCR0_OFFSET
+	bl	read_reg_rcpm
+	mov	x7, x0
+
+	/* build an override mask for IPSTPCR4/IPSTPACK4/DEVDISR5 */
+	mov	x5, xzr
+	ldr	x6, =IPPDEXPCR_MASK2
+	and	x6, x6, x7
+	cbz	x6, 1f
+
+	/* x5 = override mask
+	 * x6 = IPPDEXPCR bits for DEVDISR5
+	 * x7 = IPPDEXPCR */
+
+	/* get the overrides */
+	orr	x4, x5, #DEVDISR5_I2C_1
+	tst	x6, #IPPDEXPCR_I2C1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_LPUART1
+	tst	x6, #IPPDEXPCR_LPUART1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_FLX_TMR
+	tst	x6, #IPPDEXPCR_FLX_TMR1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_OCRAM1
+	tst	x6, #IPPDEXPCR_OCRAM1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR5_GPIO
+	tst	x6, #IPPDEXPCR_GPIO1
+	csel	x5, x5, x4, EQ
+1:
+	/* store the DEVDISR5 override mask */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	str	w5, [x2, #DEVDISR5_MASK_OFFSET]
+
+	/* build an override mask for IPSTPCR1/IPSTPACK1/DEVDISR2 */
+	mov	x5, xzr
+	ldr	x6, =IPPDEXPCR_MASK1
+	and	x6, x6, x7
+	cbz	x6, 2f
+
+	/* x5 = override mask */
+	/* x6 = IPPDEXPCR bits for DEVDISR2 */
+
+	/* get the overrides */
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC1
+	tst	x6, #IPPDEXPCR_MAC1_1
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC2
+	tst	x6, #IPPDEXPCR_MAC1_2
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC3
+	tst	x6, #IPPDEXPCR_MAC1_3
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC4
+	tst	x6, #IPPDEXPCR_MAC1_4
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC5
+	tst	x6, #IPPDEXPCR_MAC1_5
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC6
+	tst	x6, #IPPDEXPCR_MAC1_6
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1_MAC9
+	tst	x6, #IPPDEXPCR_MAC1_9
+	csel	x5, x5, x4, EQ
+
+	orr	x4, x5, #DEVDISR2_FMAN1
+	tst	x6, #IPPDEXPCR_FM1
+	csel	x5, x5, x4, EQ
+
+2:
+	/* store the DEVDISR2 override mask */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	str	w5, [x2, #DEVDISR2_MASK_OFFSET]
+
+	/* x5 = DEVDISR2 override mask */
+
+	/* write IPSTPCR0 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR0_OFFSET
+	ldr	x1, =IPSTPCR0_VALUE
+	bl	write_reg_rcpm2
+
+	/* x5 = DEVDISR2 override mask */
+
+	/* write IPSTPCR1 - overrides possible */
+	ldr	x0, =RCPM2_IPSTPCR1_OFFSET
+	ldr	x1, =IPSTPCR1_VALUE
+	bic	x1, x1, x5
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR2 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR2_OFFSET
+	ldr	x1, =IPSTPCR2_VALUE
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR3 - no overrides */
+	ldr	x0, =RCPM2_IPSTPCR3_OFFSET
+	ldr	x1, =IPSTPCR3_VALUE
+	bl	write_reg_rcpm2
+
+	/* write IPSTPCR4 - overrides possible */
+	ldr	x2, =BC_PSCI_BASE
+	add	x2, x2, #AUX_01_DATA
+	ldr	w6, [x2, #DEVDISR5_MASK_OFFSET]
+	ldr	x0, =RCPM2_IPSTPCR4_OFFSET
+	ldr	x1, =IPSTPCR4_VALUE
+	bic	x1, x1, x6
+	bl	write_reg_rcpm2
+
+	/* x5 = DEVDISR2 override mask */
+	/* x6 = DEVDISR5 override mask */
+
+	/* poll on IPSTPACK0 */
+	ldr	x3, =RCPM2_IPSTPACKR0_OFFSET
+	ldr	x4, =IPSTPCR0_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+3:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	14f
+	sub	x7, x7, #1
+	cbnz	x7, 3b
+
+14:
+	/* poll on IPSTPACK1 */
+	ldr	x3, =IPSTPCR1_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+	bic	x4, x3, x5
+	ldr	x3, =RCPM2_IPSTPACKR1_OFFSET
+4:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	15f
+	sub	x7, x7, #1
+	cbnz	x7, 4b
+
+15:
+	/* poll on IPSTPACK2 */
+	ldr	x3, =RCPM2_IPSTPACKR2_OFFSET
+	ldr	x4, =IPSTPCR2_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+5:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	16f
+	sub	x7, x7, #1
+	cbnz	x7, 5b
+
+16:
+	/* poll on IPSTPACK3 */
+	ldr	x3, =RCPM2_IPSTPACKR3_OFFSET
+	ldr	x4, =IPSTPCR3_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+6:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	17f
+	sub	x7, x7, #1
+	cbnz	x7, 6b
+
+17:
+	/* poll on IPSTPACK4 */
+	ldr	x3, =IPSTPCR4_VALUE
+	ldr	x7, =IPSTPACK_RETRY_CNT
+	bic	x4, x3, x6
+	ldr	x3, =RCPM2_IPSTPACKR4_OFFSET
+7:
+	mov	x0, x3
+	bl	read_reg_rcpm2
+	cmp	x0, x4
+	b.eq	18f
+	sub	x7, x7, #1
+	cbnz	x7, 7b
+
+18:
+	ldr	x7, =BC_PSCI_BASE
+	add	x7, x7, #AUX_01_DATA
+
+	/* x5 = DEVDISR2 override mask
+	 * x6 = DEVDISR5 override mask
+	 * x7 = [soc_data_area] */
+
+	/* save DEVDISR1 and load new value */
+	mov	x0, #DCFG_DEVDISR1_OFFSET
+	bl	read_reg_dcfg
+	mov	w13, w0
+	mov	x0, #DCFG_DEVDISR1_OFFSET
+	ldr	x1, =DEVDISR1_VALUE
+	bl	write_reg_dcfg
+
+	/* save DEVDISR2 and load new value */
+	mov	x0, #DCFG_DEVDISR2_OFFSET
+	bl	read_reg_dcfg
+	mov	w14, w0
+	mov	x0, #DCFG_DEVDISR2_OFFSET
+	ldr	x1, =DEVDISR2_VALUE
+	bic	x1, x1, x5
+	bl	write_reg_dcfg
+
+	/* x6 = DEVDISR5 override mask */
+	/* x7 = [soc_data_area] */
+
+	/* save DEVDISR3 and load new value */
+	mov	x0, #DCFG_DEVDISR3_OFFSET
+	bl	read_reg_dcfg
+	mov	w15, w0
+	mov	x0, #DCFG_DEVDISR3_OFFSET
+	ldr	x1, =DEVDISR3_VALUE
+	bl	write_reg_dcfg
+
+	/* save DEVDISR4 and load new value */
+	mov	x0, #DCFG_DEVDISR4_OFFSET
+	bl	read_reg_dcfg
+	mov	w16, w0
+	mov	x0, #DCFG_DEVDISR4_OFFSET
+	ldr	x1, =DEVDISR4_VALUE
+	bl	write_reg_dcfg
+
+	/* save DEVDISR5 and load new value */
+	mov	x0, #DCFG_DEVDISR5_OFFSET
+	bl	read_reg_dcfg
+	mov	w17, w0
+	mov	x0, #DCFG_DEVDISR5_OFFSET
+	ldr	x1, =DEVDISR5_VALUE
+	bic	x1, x1, x6
+	bl	write_reg_dcfg
+
+	/* x7 = [soc_data_area] */
+
+	/* save cpuactlr and disable data prefetch */
+	mrs	x0, CPUACTLR_EL1
+	str	w0, [x7, #CPUACTLR_DATA_OFFSET]
+	bic	x0, x0, #CPUACTLR_L1PCTL_MASK
+	msr	CPUACTLR_EL1, x0
+
+	/* x6 = DEVDISR5 override mask */
+
+	/* setup registers for cache-only execution */
+	ldr	x5, =IPSTPCR4_VALUE
+	bic	x5, x5, x6
+	mov	x6, #DDR_CNTRL_BASE_ADDR
+	mov	x7, #DCSR_RCPM2_BASE
+	mov	x8, #NXP_DCFG_ADDR
+	dsb sy
+	isb
+
+	/* set the DLL_LOCK cycle count */
+	ldr	w1, [x6, #DDR_TIMING_CFG_4_OFFSET]
+	rev	w2, w1
+	bic	w2, w2, #DLL_LOCK_MASK
+	orr	w2, w2, #DLL_LOCK_VALUE
+	rev	w1, w2
+	str	w1, [x6, #DDR_TIMING_CFG_4_OFFSET]
+
+	/*
+	 * x5  = ipstpcr4 (IPSTPCR4_VALUE bic DEVDISR5_MASK)
+	 * x6  = DDR_CNTRL_BASE_ADDR
+	 * x7  = DCSR_RCPM2_BASE
+	 * x8  = NXP_DCFG_ADDR
+	 * w13 = DEVDISR1 saved value
+	 * w14 = DEVDISR2 saved value
+	 * w15 = DEVDISR3 saved value
+	 * w16 = DEVDISR4 saved value
+	 * w17 = DEVDISR5 saved value
+	 */
+
+	/* enter the cache-only sequence */
+	mov	x9, #CORE_RESTARTABLE
+	bl	final_pwrdown
+
+	/* when we are here, the core has come out of wfi and the SoC is back up */
+
+	mov  x30, x18
+	ret
+
+/*
+ * part of CPU_SUSPEND
+ * this function performs any SoC-specific cleanup after power-down
+ * in:  x0 = core mask lsb
+ * out: none
+ * uses x0, x1
+ */
+_soc_sys_exit_pwrdn:
+	/* clear POWMGTDCR */
+	mov	x1, #DCSR_RCPM2_BASE
+	str	wzr, [x1, #RCPM2_POWMGTDCR_OFFSET]
+
+	/* clear WFIL2_EN in SCFG_COREPMCR */
+	mov	x1, #NXP_SCFG_ADDR
+	str	wzr, [x1, #SCFG_COREPMCR_OFFSET]
+
+	ret
+
+/*
+ * write a register in the SCFG block
+ * in:  x0 = offset
+ * in:  w1 = value to write
+ * uses x0, x1, x2, x3
+ */
+write_reg_scfg:
+	ldr	x2, =NXP_SCFG_ADDR
+	/* swap for BE */
+	rev	w3, w1
+	str	w3, [x2, x0]
+	ret
+/*
+ * read a register in the SCFG block
+ * in:  x0 = offset
+ * out: w0 = value read
+ * uses x0, x1, x2
+ */
+read_reg_scfg:
+	ldr	x2, =NXP_SCFG_ADDR
+	ldr	w1, [x2, x0]
+	/* swap for BE */
+	rev	w0, w1
+	ret
+
+/*
+ * write a register in the DCFG block
+ * in:  x0 = offset
+ * in:  w1 = value to write
+ * uses x0, x1, x2, x3
+ */
+write_reg_dcfg:
+	ldr	x2, =NXP_DCFG_ADDR
+	/* swap for BE */
+	rev	w3, w1
+	str	w3, [x2, x0]
+	ret
+
+/*
+ * read a register in the DCFG block
+ * in:  x0 = offset
+ * out: w0 = value read
+ * uses x0, x1, x2
+ */
+read_reg_dcfg:
+	ldr	x2, =NXP_DCFG_ADDR
+	ldr	w1, [x2, x0]
+	/* swap for BE */
+	rev	w0, w1
+	ret
+
+/*
+ * write a register in the RCPM block
+ * in:  x0 = offset
+ * in:  w1 = value to write
+ * uses x0, x1, x2, x3
+ */
+write_reg_rcpm:
+	ldr	x2, =NXP_RCPM_ADDR
+	/* swap for BE */
+	rev	w3, w1
+	str	w3, [x2, x0]
+    ret
+
+/*
+ * read a register in the RCPM block
+ * in:  x0 = offset
+ * out: w0 = value read
+ * uses x0, x1, x2
+ */
+read_reg_rcpm:
+	ldr	x2, =NXP_RCPM_ADDR
+	ldr	w1, [x2, x0]
+	/* swap for BE */
+	rev	w0, w1
+	ret
+
+/*
+ * write a register in the DCSR-RCPM2 block
+ * in:  x0 = offset
+ * in:  w1 = value to write
+ * uses x0, x1, x2, x3
+ */
+write_reg_rcpm2:
+	ldr	x2, =DCSR_RCPM2_BASE
+	/* swap for BE */
+	rev	w3, w1
+	str	w3, [x2, x0]
+	ret
+
+/*
+ * read a register in the DCSR-RCPM2 block
+ * in:  x0 = offset
+ * out: w0 = value read
+ * uses x0, x1, x2
+ */
+read_reg_rcpm2:
+	ldr	x2, =DCSR_RCPM2_BASE
+	ldr	w1, [x2, x0]
+	/* swap for BE */
+	rev	w0, w1
+	ret
+
+/*
+ * this function returns the base address of the gic distributor
+ * in:  none
+ * out: x0 = base address of gic distributor
+ * uses x0, x1
+ */
+_getGICD_BaseAddr:
+	/* read SVR and get the SoC version */
+	mov	x0, #NXP_DCFG_ADDR
+	ldr	w1, [x0, #DCFG_SVR_OFFSET]
+	rev	w0, w1
+
+	/* x0 =  svr */
+	and	w0, w0, #SVR_MIN_VER_MASK
+	cmp	w0, #SVR_MINOR_VER_0
+	b.ne	8f
+
+	/* load the gic base addresses for rev 1.0 parts */
+	ldr	x0, =NXP_GICD_4K_ADDR
+	b	10f
+8:
+	/* for rev 1.1 and later parts, the GIC base addresses */
+	/* can be at 4k or 64k offsets */
+
+	/* read the scfg reg GIC400_ADDR_ALIGN */
+	mov	x0, #NXP_SCFG_ADDR
+	ldr	w1, [x0, #SCFG_GIC400_ADDR_ALIGN_OFFSET]
+	rev	w0, w1
+
+	/* x0 = GIC400_ADDR_ALIGN value */
+	and	x0, x0, #SCFG_GIC400_ADDR_ALIGN_4KMODE_MASK
+	mov	x1, #SCFG_GIC400_ADDR_ALIGN_4KMODE_EN
+	cmp	x0, x1
+	b.ne	9f
+
+	/* load the base addresses for 4k offsets */
+	ldr	x0, =NXP_GICD_4K_ADDR
+	b	10f
+9:
+	/* load the base address for 64k offsets */
+	ldr	x0, =NXP_GICD_64K_ADDR
+10:
+	ret
+
+/*
+ * this function returns the base address of the gic distributor
+ * in:  none
+ * out: x0 = base address of gic controller
+ * uses x0, x1
+ */
+_getGICC_BaseAddr:
+	/* read SVR and get the SoC version */
+	mov	x0, #NXP_DCFG_ADDR
+	ldr	w1, [x0, #DCFG_SVR_OFFSET]
+	rev	w0, w1
+
+	/* x0 =  svr */
+	and	w0, w0, #SVR_MIN_VER_MASK
+	cmp	w0, #SVR_MINOR_VER_0
+	b.ne	8f
+
+	/* load the gic base addresses for rev 1.0 parts */
+	ldr	x0, =NXP_GICC_4K_ADDR
+	b	10f
+8:
+	/* for rev 1.1 and later parts, the GIC base addresses */
+	/* can be at 4k or 64k offsets */
+
+	/* read the scfg reg GIC400_ADDR_ALIGN */
+	mov	x0, #NXP_SCFG_ADDR
+	ldr	w1, [x0, #SCFG_GIC400_ADDR_ALIGN_OFFSET]
+	rev	w0, w1
+
+	/* x0 = GIC400_ADDR_ALIGN value */
+	and	x0, x0, #SCFG_GIC400_ADDR_ALIGN_4KMODE_MASK
+	mov	x1, #SCFG_GIC400_ADDR_ALIGN_4KMODE_EN
+	cmp	x0, x1
+	b.ne	9f
+
+	/* load the base addresses for 4k offsets */
+	ldr	x0, =NXP_GICC_4K_ADDR
+	b	10f
+9:
+	/* load the base address for 64k offsets */
+	ldr	x0, =NXP_GICC_64K_ADDR
+10:
+	ret
+
+/*
+ * this function will pwrdown ddr and the final core - it will do this
+ * by loading itself into the icache and then executing from there
+ * in:  x5  = ipstpcr4 (IPSTPCR4_VALUE bic DEVDISR5_MASK)
+ *      x6  = DDR_CNTRL_BASE_ADDR
+ *      x7  = DCSR_RCPM2_BASE
+ *      x8  = NXP_DCFG_ADDR
+ *      x9  = 0, restartable
+ *          = 1, non-restartable
+ *      w13 = DEVDISR1 saved value
+ *      w14 = DEVDISR2 saved value
+ *      w15 = DEVDISR3 saved value
+ *      w16 = DEVDISR4 saved value
+ *      w17 = DEVDISR5 saved value
+ * out: none
+ * uses x0 ~ x9
+ */
+
+/* 4Kb aligned */
+.align 12
+final_pwrdown:
+	mov	x0, xzr
+	b	touch_line_0
+start_line_0:
+	mov	x0, #1
+	mov	x2, #DDR_SDRAM_CFG_2_FRCSR         /* put ddr in self refresh - start */
+	ldr	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]
+	rev	w4, w3
+	orr	w4, w4, w2
+	rev	w3, w4
+	str	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]  /* put ddr in self refresh - end */
+	orr	w3, w5, #DEVDISR5_MEM              /* quiesce ddr clocks - start */
+	rev	w4, w3
+	str	w4, [x7, #RCPM2_IPSTPCR4_OFFSET]   /* quiesce ddr clocks - end */
+
+	mov	w3, #DEVDISR5_MEM
+	rev	w3, w3                             /* polling mask */
+	mov	x2, #DDR_SLEEP_RETRY_CNT           /* poll on ipstpack4 - start */
+touch_line_0:
+	cbz	x0,	touch_line_1
+
+start_line_1:
+	ldr	w1, [x7, #RCPM2_IPSTPACKR4_OFFSET]
+	tst	w1, w3
+	b.ne	1f
+	subs	x2, x2, #1
+	b.gt	start_line_1                       /* poll on ipstpack4 - end */
+
+	/* if we get here, we have a timeout err */
+	rev 	w4, w5
+	str	w4, [x7, #RCPM2_IPSTPCR4_OFFSET]   /* re-enable ddr clks interface */
+	mov	x0, #ERROR_DDR_SLEEP               /* load error code */
+	b	2f
+1:
+	str	w4, [x8, #DCFG_DEVDISR5_OFFSET]    /* disable ddr cntrlr clk in devdisr5 */
+5:
+	wfi                                     /* stop the final core */
+
+	cbnz	x9, 5b                             /* if non-restartable, keep in wfi */
+	rev	w4, w5
+	str	w4, [x8, #DCFG_DEVDISR5_OFFSET]    /* re-enable ddr in devdisr5 */
+	str	w4, [x7, #RCPM2_IPSTPCR4_OFFSET]   /* re-enable ddr clk in ipstpcr4 */
+touch_line_1:
+	cbz	x0, touch_line_2
+
+start_line_2:
+	ldr	w1, [x7, #RCPM2_IPSTPACKR4_OFFSET] /* poll on ipstpack4 - start */
+	tst	w1, w3
+	b.eq	2f
+	nop
+	b	start_line_2                       /* poll on ipstpack4 - end */
+2:
+	mov	x2, #DDR_SDRAM_CFG_2_FRCSR         /* take ddr out-of self refresh - start */
+	ldr	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]
+	rev	w4, w3
+	bic	w4, w4, w2
+	rev	w3, w4
+	mov	x1, #DDR_SLEEP_RETRY_CNT           /* wait for ddr cntrlr clock - start */
+3:
+	subs	x1, x1, #1
+	b.gt	3b                                 /* wait for ddr cntrlr clock - end */
+	str	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]  /* take ddr out-of self refresh - end */
+	rev	w1, w17
+touch_line_2:
+	cbz	x0, touch_line_3
+
+start_line_3:
+	str	w1, [x8, #DCFG_DEVDISR5_OFFSET]    /* reset devdisr5 */
+	rev	w1, w16
+	str	w1, [x8, #DCFG_DEVDISR4_OFFSET]    /* reset devdisr4 */
+	rev	w1, w15
+	str	w1, [x8, #DCFG_DEVDISR3_OFFSET]    /* reset devdisr3 */
+	rev	w1, w14
+	str	w1, [x8, #DCFG_DEVDISR2_OFFSET]    /* reset devdisr2 */
+	rev	w1, w13
+	str	w1, [x8, #DCFG_DEVDISR1_OFFSET]    /* reset devdisr1 */
+	str	wzr, [x7, #RCPM2_IPSTPCR4_OFFSET]  /* reset ipstpcr4 */
+	str	wzr, [x7, #RCPM2_IPSTPCR3_OFFSET]  /* reset ipstpcr3 */
+	str	wzr, [x7, #RCPM2_IPSTPCR2_OFFSET]  /* reset ipstpcr2 */
+	str	wzr, [x7, #RCPM2_IPSTPCR1_OFFSET]  /* reset ipstpcr1 */
+	str	wzr, [x7, #RCPM2_IPSTPCR0_OFFSET]  /* reset ipstpcr0 */
+	b	continue_restart
+touch_line_3:
+	cbz	x0, start_line_0
+
+/* execute here after ddr is back up */
+continue_restart:
+	/*
+	 * if x0 = 1, all is well
+	 * if x0 < 1, we had an error
+	 */
+	cmp	x0, #1
+	b.ne	4f
+	mov	x0, #0
+4:
+	ret
+
+/*
+ * Note: there is no return from this function
+ * this function will shutdown ddr and the final core - it will do this
+ * by loading itself into the icache and then executing from there
+ * in:  x5  = ipstpcr4 (IPSTPCR4_VALUE bic DEVDISR5_MASK)
+ *      x6  = DDR_CNTRL_BASE_ADDR
+ *      x7  = DCSR_RCPM2_BASE
+ *      x8  = NXP_DCFG_ADDR
+ * out: none
+ * uses x0 ~ x8
+ */
+
+/* 4Kb aligned */
+.align 12
+final_shutdown:
+
+	mov	x0, xzr
+	b	touch_line0
+start_line0:
+	mov	x0, #1
+	mov	x2, #DDR_SDRAM_CFG_2_FRCSR         /* put ddr in self refresh - start */
+	ldr	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]
+	rev	w4, w3
+	orr	w4, w4, w2
+	rev	w3, w4
+	str	w3, [x6, #DDR_SDRAM_CFG_2_OFFSET]  /* put ddr in self refresh - end */
+	orr	w3, w5, #DEVDISR5_MEM              /* quiesce ddr clocks - start */
+	rev	w4, w3
+	str	w4, [x7, #RCPM2_IPSTPCR4_OFFSET]   /* quiesce ddr clocks - end */
+
+	mov	w3, #DEVDISR5_MEM
+	rev	w3, w3                             /* polling mask */
+	mov	x2, #DDR_SLEEP_RETRY_CNT           /* poll on ipstpack4 - start */
+touch_line0:
+	cbz  x0, touch_line1
+
+start_line1:
+	ldr	w1, [x7, #RCPM2_IPSTPACKR4_OFFSET]
+	tst	w1, w3
+	b.ne	1f
+	subs	x2, x2, #1
+	b.gt	start_line1                       /* poll on ipstpack4 - end */
+	nop
+	nop
+	nop
+	nop
+1:
+	str	w4, [x8, #DCFG_DEVDISR5_OFFSET]    /* disable ddr cntrlr clk in devdisr5 */
+5:
+	wfi                                     /* stop the final core */
+	b	5b                                 /* stay here until POR */
+	nop
+	nop
+	nop
+touch_line1:
+	cbz	x0, start_line0