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   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  * arch/arm/cpu/armv8/rcar_gen3/lowlevel_init.S
   4  *      This file is lowlevel initialize routine.
   5  *
   6  * (C) Copyright 2015 Renesas Electronics Corporation
   7  *
   8  * This file is based on the arch/arm/cpu/armv8/start.S
   9  *
  10  * (C) Copyright 2013
  11  * David Feng <fenghua@phytium.com.cn>
  12  */
  13
  14 #include <asm-offsets.h>
  15 #include <config.h>
  16 #include <linux/linkage.h>
  17 #include <asm/macro.h>
  18
  19 ENTRY(lowlevel_init)
  20         mov     x29, lr                 /* Save LR */
  21
  22 #ifndef CONFIG_ARMV8_MULTIENTRY
  23         /*
  24          * For single-entry systems the lowlevel init is very simple.
  25          */
  26         ldr     x0, =GICD_BASE
  27         bl      gic_init_secure
  28
  29 #else /* CONFIG_ARMV8_MULTIENTRY is set */
  30
  31 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
  32         branch_if_slave x0, 1f
  33         ldr     x0, =GICD_BASE
  34         bl      gic_init_secure
  35 1:
  36 #if defined(CONFIG_GICV3)
  37         ldr     x0, =GICR_BASE
  38         bl      gic_init_secure_percpu
  39 #elif defined(CONFIG_GICV2)
  40         ldr     x0, =GICD_BASE
  41         ldr     x1, =GICC_BASE
  42         bl      gic_init_secure_percpu
  43 #endif
  44 #endif
  45
  46         branch_if_master x0, x1, 2f
  47
  48         /*
  49          * Slave should wait for master clearing spin table.
  50          * This sync prevent salves observing incorrect
  51          * value of spin table and jumping to wrong place.
  52          */
  53 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
  54 #ifdef CONFIG_GICV2
  55         ldr     x0, =GICC_BASE
  56 #endif
  57         bl      gic_wait_for_interrupt
  58 #endif
  59
  60         /*
  61          * All slaves will enter EL2 and optionally EL1.
  62          */
  63         adr     x4, lowlevel_in_el2
  64         ldr     x5, =ES_TO_AARCH64
  65         bl      armv8_switch_to_el2
  66
  67 lowlevel_in_el2:
  68 #ifdef CONFIG_ARMV8_SWITCH_TO_EL1
  69         adr     x4, lowlevel_in_el1
  70         ldr     x5, =ES_TO_AARCH64
  71         bl      armv8_switch_to_el1
  72
  73 lowlevel_in_el1:
  74 #endif
  75 #endif /* CONFIG_ARMV8_MULTIENTRY */
  76
  77         bl      s_init
  78
  79 2:
  80         mov     lr, x29                 /* Restore LR */
  81         ret
  82 ENDPROC(lowlevel_init)