| /* |
| * Copyright (c) 2013-2016, ARM Limited and Contributors. All rights reserved. |
| * |
| * SPDX-License-Identifier: BSD-3-Clause |
| */ |
| |
| #include <arch.h> |
| #include <asm_macros.S> |
| #include <gicv2.h> |
| #include <gicv3.h> |
| #include <platform_def.h> |
| #include <v2m_def.h> |
| #include "../drivers/pwrc/fvp_pwrc.h" |
| #include "../fvp_def.h" |
| |
| .globl plat_secondary_cold_boot_setup |
| .globl plat_get_my_entrypoint |
| .globl plat_is_my_cpu_primary |
| |
| .macro fvp_choose_gicmmap param1, param2, x_tmp, w_tmp, res |
| ldr \x_tmp, =V2M_SYSREGS_BASE + V2M_SYS_ID |
| ldr \w_tmp, [\x_tmp] |
| ubfx \w_tmp, \w_tmp, #V2M_SYS_ID_BLD_SHIFT, #V2M_SYS_ID_BLD_LENGTH |
| cmp \w_tmp, #BLD_GIC_VE_MMAP |
| csel \res, \param1, \param2, eq |
| .endm |
| |
| /* ----------------------------------------------------- |
| * void plat_secondary_cold_boot_setup (void); |
| * |
| * This function performs any platform specific actions |
| * needed for a secondary cpu after a cold reset e.g |
| * mark the cpu's presence, mechanism to place it in a |
| * holding pen etc. |
| * TODO: Should we read the PSYS register to make sure |
| * that the request has gone through. |
| * ----------------------------------------------------- |
| */ |
| func plat_secondary_cold_boot_setup |
| #ifndef EL3_PAYLOAD_BASE |
| /* --------------------------------------------- |
| * Power down this cpu. |
| * TODO: Do we need to worry about powering the |
| * cluster down as well here. That will need |
| * locks which we won't have unless an elf- |
| * loader zeroes out the zi section. |
| * --------------------------------------------- |
| */ |
| mrs x0, mpidr_el1 |
| ldr x1, =PWRC_BASE |
| str w0, [x1, #PPOFFR_OFF] |
| |
| /* --------------------------------------------- |
| * Disable GIC bypass as well |
| * --------------------------------------------- |
| */ |
| /* Check for GICv3 system register access */ |
| mrs x0, id_aa64pfr0_el1 |
| ubfx x0, x0, #ID_AA64PFR0_GIC_SHIFT, #ID_AA64PFR0_GIC_WIDTH |
| cmp x0, #1 |
| b.ne gicv2_bypass_disable |
| |
| /* Check for SRE enable */ |
| mrs x1, ICC_SRE_EL3 |
| tst x1, #ICC_SRE_SRE_BIT |
| b.eq gicv2_bypass_disable |
| |
| mrs x2, ICC_SRE_EL3 |
| orr x2, x2, #(ICC_SRE_DIB_BIT | ICC_SRE_DFB_BIT) |
| msr ICC_SRE_EL3, x2 |
| b secondary_cold_boot_wait |
| |
| gicv2_bypass_disable: |
| ldr x0, =VE_GICC_BASE |
| ldr x1, =BASE_GICC_BASE |
| fvp_choose_gicmmap x0, x1, x2, w2, x1 |
| mov w0, #(IRQ_BYP_DIS_GRP1 | FIQ_BYP_DIS_GRP1) |
| orr w0, w0, #(IRQ_BYP_DIS_GRP0 | FIQ_BYP_DIS_GRP0) |
| str w0, [x1, #GICC_CTLR] |
| |
| secondary_cold_boot_wait: |
| /* --------------------------------------------- |
| * There is no sane reason to come out of this |
| * wfi so panic if we do. This cpu will be pow- |
| * ered on and reset by the cpu_on pm api |
| * --------------------------------------------- |
| */ |
| dsb sy |
| wfi |
| no_ret plat_panic_handler |
| #else |
| mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE |
| |
| /* Wait until the entrypoint gets populated */ |
| poll_mailbox: |
| ldr x1, [x0] |
| cbz x1, 1f |
| br x1 |
| 1: |
| wfe |
| b poll_mailbox |
| #endif /* EL3_PAYLOAD_BASE */ |
| endfunc plat_secondary_cold_boot_setup |
| |
| /* --------------------------------------------------------------------- |
| * uintptr_t plat_get_my_entrypoint (void); |
| * |
| * Main job of this routine is to distinguish between a cold and warm |
| * boot. On FVP, this information can be queried from the power |
| * controller. The Power Control SYS Status Register (PSYSR) indicates |
| * the wake-up reason for the CPU. |
| * |
| * For a cold boot, return 0. |
| * For a warm boot, read the mailbox and return the address it contains. |
| * |
| * TODO: PSYSR is a common register and should be |
| * accessed using locks. Since it is not possible |
| * to use locks immediately after a cold reset |
| * we are relying on the fact that after a cold |
| * reset all cpus will read the same WK field |
| * --------------------------------------------------------------------- |
| */ |
| func plat_get_my_entrypoint |
| /* --------------------------------------------------------------------- |
| * When bit PSYSR.WK indicates either "Wake by PPONR" or "Wake by GIC |
| * WakeRequest signal" then it is a warm boot. |
| * --------------------------------------------------------------------- |
| */ |
| mrs x2, mpidr_el1 |
| ldr x1, =PWRC_BASE |
| str w2, [x1, #PSYSR_OFF] |
| ldr w2, [x1, #PSYSR_OFF] |
| ubfx w2, w2, #PSYSR_WK_SHIFT, #PSYSR_WK_WIDTH |
| cmp w2, #WKUP_PPONR |
| beq warm_reset |
| cmp w2, #WKUP_GICREQ |
| beq warm_reset |
| |
| /* Cold reset */ |
| mov x0, #0 |
| ret |
| |
| warm_reset: |
| /* --------------------------------------------------------------------- |
| * A mailbox is maintained in the trusted SRAM. It is flushed out of the |
| * caches after every update using normal memory so it is safe to read |
| * it here with SO attributes. |
| * --------------------------------------------------------------------- |
| */ |
| mov_imm x0, PLAT_ARM_TRUSTED_MAILBOX_BASE |
| ldr x0, [x0] |
| cbz x0, _panic_handler |
| ret |
| |
| /* --------------------------------------------------------------------- |
| * The power controller indicates this is a warm reset but the mailbox |
| * is empty. This should never happen! |
| * --------------------------------------------------------------------- |
| */ |
| _panic_handler: |
| no_ret plat_panic_handler |
| endfunc plat_get_my_entrypoint |
| |
| /* ----------------------------------------------------- |
| * unsigned int plat_is_my_cpu_primary (void); |
| * |
| * Find out whether the current cpu is the primary |
| * cpu. |
| * ----------------------------------------------------- |
| */ |
| func plat_is_my_cpu_primary |
| mrs x0, mpidr_el1 |
| and x0, x0, #(MPIDR_CLUSTER_MASK | MPIDR_CPU_MASK) |
| cmp x0, #FVP_PRIMARY_CPU |
| cset w0, eq |
| ret |
| endfunc plat_is_my_cpu_primary |