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https://github.com/AsahiLinux/u-boot
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61 lines
1.1 KiB
ArmAsm
61 lines
1.1 KiB
ArmAsm
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/*
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* arch/arm/cpu/armv7/rmobile/lowlevel_init_ca15.S
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* This file is lager low level initialize.
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*
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* Copyright (C) 2013 Renesas Electronics Corporation
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <config.h>
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#include <linux/linkage.h>
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ENTRY(lowlevel_init)
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mrc p15, 0, r4, c0, c0, 5 /* mpidr */
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orr r4, r4, r4, lsr #6
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and r4, r4, #7 /* id 0-3 = ca15.0,1,2,3 */
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b do_lowlevel_init
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.pool
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/*
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* CPU ID #1-#3 come here
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*/
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.align 4
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do_cpu_waiting:
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ldr r1, =0xe6180000 /* sysc */
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1: ldr r0, [r1, #0x20] /* sbar */
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tst r0, r0
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beq 1b
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bx r0
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/*
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* Only CPU ID #0 comes here
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*/
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.align 4
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do_lowlevel_init:
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/* surpress wfe if ca15 */
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tst r4, #4
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mrceq p15, 0, r0, c1, c0, 1 /* actlr */
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orreq r0, r0, #(1<<7)
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mcreq p15, 0, r0, c1, c0, 1
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/* and set l2 latency */
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mrceq p15, 1, r0, c9, c0, 2 /* l2ctlr */
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orreq r0, r0, #0x00000800
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orreq r0, r0, #0x00000003
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mcreq p15, 1, r0, c9, c0, 2
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ldr r3, =(CONFIG_SYS_INIT_SP_ADDR)
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sub sp, r3, #4
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str lr, [sp]
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/* initialize system */
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bl s_init
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ldr lr, [sp]
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mov pc, lr
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nop
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ENDPROC(lowlevel_init)
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.ltorg
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