mirror of
https://github.com/AsahiLinux/u-boot
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40f8dec54d
Secondary cores need to be released from holdoff by boot release registers. With GPP bootrom, they can boot from main memory directly. Individual spin table is used for each core. Spin table and the boot page is reserved in device tree so OS won't overwrite. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Arnab Basu <arnab.basu@freescale.com>
150 lines
3.5 KiB
ArmAsm
150 lines
3.5 KiB
ArmAsm
/*
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* (C) Copyright 2014 Freescale Semiconductor
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Extracted from armv8/start.S
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*/
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#include <config.h>
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#include <linux/linkage.h>
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#include <asm/gic.h>
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#include <asm/macro.h>
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#include "mp.h"
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ENTRY(lowlevel_init)
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mov x29, lr /* Save LR */
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/* Set the SMMU page size in the sACR register */
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ldr x1, =SMMU_BASE
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ldr w0, [x1, #0x10]
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orr w0, w0, #1 << 16 /* set sACR.pagesize to indicate 64K page */
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str w0, [x1, #0x10]
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/* Initialize GIC Secure Bank Status */
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#if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
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branch_if_slave x0, 1f
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ldr x0, =GICD_BASE
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bl gic_init_secure
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1:
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#ifdef CONFIG_GICV3
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ldr x0, =GICR_BASE
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bl gic_init_secure_percpu
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#elif defined(CONFIG_GICV2)
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ldr x0, =GICD_BASE
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ldr x1, =GICC_BASE
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bl gic_init_secure_percpu
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#endif
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#endif
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branch_if_master x0, x1, 2f
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ldr x0, =secondary_boot_func
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blr x0
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2:
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mov lr, x29 /* Restore LR */
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ret
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ENDPROC(lowlevel_init)
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/* Keep literals not used by the secondary boot code outside it */
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.ltorg
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/* Using 64 bit alignment since the spin table is accessed as data */
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.align 4
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.global secondary_boot_code
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/* Secondary Boot Code starts here */
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secondary_boot_code:
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.global __spin_table
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__spin_table:
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.space CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE
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.align 2
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ENTRY(secondary_boot_func)
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/*
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* MPIDR_EL1 Fields:
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* MPIDR[1:0] = AFF0_CPUID <- Core ID (0,1)
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* MPIDR[7:2] = AFF0_RES
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* MPIDR[15:8] = AFF1_CLUSTERID <- Cluster ID (0,1,2,3)
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* MPIDR[23:16] = AFF2_CLUSTERID
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* MPIDR[24] = MT
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* MPIDR[29:25] = RES0
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* MPIDR[30] = U
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* MPIDR[31] = ME
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* MPIDR[39:32] = AFF3
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*
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* Linear Processor ID (LPID) calculation from MPIDR_EL1:
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* (We only use AFF0_CPUID and AFF1_CLUSTERID for now
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* until AFF2_CLUSTERID and AFF3 have non-zero values)
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*
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* LPID = MPIDR[15:8] | MPIDR[1:0]
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*/
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mrs x0, mpidr_el1
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ubfm x1, x0, #8, #15
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ubfm x2, x0, #0, #1
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orr x10, x2, x1, lsl #2 /* x10 has LPID */
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ubfm x9, x0, #0, #15 /* x9 contains MPIDR[15:0] */
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/*
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* offset of the spin table element for this core from start of spin
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* table (each elem is padded to 64 bytes)
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*/
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lsl x1, x10, #6
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ldr x0, =__spin_table
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/* physical address of this cpus spin table element */
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add x11, x1, x0
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str x9, [x11, #16] /* LPID */
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mov x4, #1
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str x4, [x11, #8] /* STATUS */
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dsb sy
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#if defined(CONFIG_GICV3)
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gic_wait_for_interrupt_m x0
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#elif defined(CONFIG_GICV2)
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ldr x0, =GICC_BASE
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gic_wait_for_interrupt_m x0, w1
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#endif
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bl secondary_switch_to_el2
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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bl secondary_switch_to_el1
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#endif
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slave_cpu:
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wfe
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ldr x0, [x11]
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cbz x0, slave_cpu
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#ifndef CONFIG_ARMV8_SWITCH_TO_EL1
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mrs x1, sctlr_el2
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#else
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mrs x1, sctlr_el1
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#endif
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tbz x1, #25, cpu_is_le
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rev x0, x0 /* BE to LE conversion */
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cpu_is_le:
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br x0 /* branch to the given address */
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ENDPROC(secondary_boot_func)
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ENTRY(secondary_switch_to_el2)
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switch_el x0, 1f, 0f, 0f
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0: ret
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1: armv8_switch_to_el2_m x0
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ENDPROC(secondary_switch_to_el2)
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ENTRY(secondary_switch_to_el1)
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switch_el x0, 0f, 1f, 0f
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0: ret
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1: armv8_switch_to_el1_m x0, x1
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ENDPROC(secondary_switch_to_el1)
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/* Ensure that the literals used by the secondary boot code are
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* assembled within it (this is required so that we can protect
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* this area with a single memreserve region
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*/
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.ltorg
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/* 64 bit alignment for elements accessed as data */
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.align 4
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.globl __secondary_boot_code_size
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.type __secondary_boot_code_size, %object
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/* Secondary Boot Code ends here */
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__secondary_boot_code_size:
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.quad .-secondary_boot_code
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