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26e30c6489
Enable ARM big-endian mode on mach-imx. This requires adding some byte swapping in the debug functions (which otherwise hang forever) and of course the secondary core bringup. Tested (on top of 4.4) on i.MX6 HummingBoard quad-core (IMX6Q). The patch is pretty much as suggested by Arnd Bergmann, thanks! Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
50 lines
1.3 KiB
ArmAsm
50 lines
1.3 KiB
ArmAsm
/* arch/arm/mach-imx/include/mach/debug-macro.S
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*
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* Debugging macro include header
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*
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* Copyright (C) 1994-1999 Russell King
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* Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <asm/assembler.h>
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#include "imx-uart.h"
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/*
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* FIXME: This is a copy of IMX_IO_P2V in hardware.h, and needs to
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* stay sync with that. It's hard to maintain, and should be fixed
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* globally for multi-platform build to use a fixed virtual address
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* for low-level debug uart port across platforms.
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*/
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#define IMX_IO_P2V(x) ( \
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(((x) & 0x80000000) >> 7) | \
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(0xf4000000 + \
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(((x) & 0x50000000) >> 6) + \
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(((x) & 0x0b000000) >> 4) + \
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(((x) & 0x000fffff))))
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#define UART_VADDR IMX_IO_P2V(UART_PADDR)
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.macro addruart, rp, rv, tmp
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ldr \rp, =UART_PADDR @ physical
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ldr \rv, =UART_VADDR @ virtual
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.endm
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.macro senduart,rd,rx
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ARM_BE8(rev \rd, \rd)
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str \rd, [\rx, #0x40] @ TXDATA
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.endm
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.macro waituart,rd,rx
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.endm
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.macro busyuart,rd,rx
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1002: ldr \rd, [\rx, #0x98] @ SR2
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ARM_BE8(rev \rd, \rd)
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tst \rd, #1 << 3 @ TXDC
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beq 1002b @ wait until transmit done
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.endm
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