mirror of
https://github.com/AsahiLinux/u-boot
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159 lines
3.4 KiB
ArmAsm
159 lines
3.4 KiB
ArmAsm
/*
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* SoC-specific setup info
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*
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* (C) Copyright 2010,2011
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* NVIDIA Corporation <www.nvidia.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <config.h>
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#include <version.h>
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_TEXT_BASE:
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.word CONFIG_SYS_TEXT_BASE @ sdram load addr from config file
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.global invalidate_dcache
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invalidate_dcache:
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mov pc, lr
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.align 5
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.global reset_cpu
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reset_cpu:
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ldr r1, rstctl @ get addr for global reset
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@ reg
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ldr r3, [r1]
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orr r3, r3, #0x10
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str r3, [r1] @ force reset
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mov r0, r0
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_loop_forever:
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b _loop_forever
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rstctl:
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.word PRM_RSTCTRL
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.globl lowlevel_init
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lowlevel_init:
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ldr sp, SRAM_STACK
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str ip, [sp]
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mov ip, lr
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bl s_init @ go setup pll, mux & memory
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ldr ip, [sp]
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mov lr, ip
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mov pc, lr @ back to arch calling code
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.globl startup_cpu
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startup_cpu:
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@ Initialize the AVP, clocks, and memory controller
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@ SDRAM is guaranteed to be on at this point
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ldr r0, =cold_boot @ R0 = reset vector for CPU
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bl start_cpu @ start the CPU
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@ Transfer control to the AVP code
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bl halt_avp
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@ Should never get here
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_loop_forever2:
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b _loop_forever2
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.globl cache_configure
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cache_configure:
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stmdb r13!,{r14}
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@ invalidate instruction cache
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mov r1, #0
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mcr p15, 0, r1, c7, c5, 0
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@ invalidate the i&d tlb entries
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mcr p15, 0, r1, c8, c5, 0
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mcr p15, 0, r1, c8, c6, 0
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@ enable instruction cache
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mrc p15, 0, r1, c1, c0, 0
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orr r1, r1, #(1<<12)
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mcr p15, 0, r1, c1, c0, 0
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bl enable_scu
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@ enable SMP mode and FW for CPU0, by writing to Auxiliary Ctl reg
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mrc p15, 0, r0, c1, c0, 1
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orr r0, r0, #0x41
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mcr p15, 0, r0, c1, c0, 1
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@ Now flush the Dcache
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mov r0, #0
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@ 256 cache lines
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mov r1, #256
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invalidate_loop:
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add r1, r1, #-1
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mov r0, r1, lsl #5
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@ invalidate d-cache using line (way0)
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mcr p15, 0, r0, c7, c6, 2
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orr r2, r0, #(1<<30)
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@ invalidate d-cache using line (way1)
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mcr p15, 0, r2, c7, c6, 2
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orr r2, r0, #(2<<30)
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@ invalidate d-cache using line (way2)
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mcr p15, 0, r2, c7, c6, 2
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orr r2, r0, #(3<<30)
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@ invalidate d-cache using line (way3)
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mcr p15, 0, r2, c7, c6, 2
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cmp r1, #0
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bne invalidate_loop
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@ FIXME: should have ap20's L2 disabled too?
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invalidate_done:
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ldmia r13!,{pc}
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.globl cold_boot
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cold_boot:
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msr cpsr_c, #0xD3
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@ Check current processor: CPU or AVP?
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@ If CPU, go to CPU boot code, else continue on AVP path
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ldr r0, =NV_PA_PG_UP_BASE
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ldr r1, [r0]
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ldr r2, =PG_UP_TAG_AVP
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@ are we the CPU?
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ldr sp, CPU_STACK
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cmp r1, r2
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@ yep, we are the CPU
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bne _armboot_start
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@ AVP initialization follows this path
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ldr sp, AVP_STACK
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@ Init AVP and start CPU
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b startup_cpu
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@ the literal pools origin
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.ltorg
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SRAM_STACK:
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.word LOW_LEVEL_SRAM_STACK
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AVP_STACK:
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.word EARLY_AVP_STACK
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CPU_STACK:
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.word EARLY_CPU_STACK
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