70 lines
1.6 KiB
ArmAsm
70 lines
1.6 KiB
ArmAsm
/*
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* Copyright (C) 2013 Gabor Juhos <juhosg@openwrt.org>
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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 <gt64120.h>
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#include <asm/addrspace.h>
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#include <asm/regdef.h>
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#include <asm/malta.h>
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#ifdef CONFIG_SYS_BIG_ENDIAN
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#define CPU_TO_GT32(_x) ((_x))
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#else
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#define CPU_TO_GT32(_x) ( \
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(((_x) & 0xff) << 24) | (((_x) & 0xff00) << 8) | \
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(((_x) & 0xff0000) >> 8) | (((_x) & 0xff000000) >> 24))
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#endif
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.text
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.set noreorder
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.set mips32
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.globl lowlevel_init
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lowlevel_init:
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/*
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* Load BAR registers of GT64120 as done by YAMON
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*
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* based on a patch sent by Antony Pavlov <antonynpavlov@gmail.com>
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* to the barebox mailing list.
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* The subject of the original patch:
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* 'MIPS: qemu-malta: add YAMON-style GT64120 memory map'
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* URL:
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* http://www.mail-archive.com/barebox@lists.infradead.org/msg06128.html
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*
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* based on write_bootloader() in qemu.git/hw/mips_malta.c
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* see GT64120 manual and qemu.git/hw/gt64xxx.c for details
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*/
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/* move GT64120 registers from 0x14000000 to 0x1be00000 */
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li t1, KSEG1ADDR(GT_DEF_BASE)
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li t0, CPU_TO_GT32(0xdf000000)
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sw t0, GT_ISD_OFS(t1)
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/* setup MEM-to-PCI0 mapping */
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li t1, KSEG1ADDR(MALTA_GT_BASE)
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/* setup PCI0 io window to 0x18000000-0x181fffff */
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li t0, CPU_TO_GT32(0xc0000000)
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sw t0, GT_PCI0IOLD_OFS(t1)
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li t0, CPU_TO_GT32(0x40000000)
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sw t0, GT_PCI0IOHD_OFS(t1)
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/* setup PCI0 mem windows */
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li t0, CPU_TO_GT32(0x80000000)
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sw t0, GT_PCI0M0LD_OFS(t1)
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li t0, CPU_TO_GT32(0x3f000000)
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sw t0, GT_PCI0M0HD_OFS(t1)
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li t0, CPU_TO_GT32(0xc1000000)
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sw t0, GT_PCI0M1LD_OFS(t1)
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li t0, CPU_TO_GT32(0x5e000000)
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sw t0, GT_PCI0M1HD_OFS(t1)
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jr ra
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nop
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