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ARM: mxs: Add low-level debug UART support

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- DEBUG_LL support, which is incompatible with multi-soc MXS image
   because of different DUART base address on MX23 and MX28
 - uncompress message support

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
Shawn Guo 2010-12-20 22:57:42 +08:00 committed by Uwe Kleine-König
parent 289569f902
commit 41fa75bc09
2 changed files with 114 additions and 0 deletions
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38
arch/arm/mach-mxs/include/mach/debug-macro.S Normal file
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/* arch/arm/mach-mxs/include/mach/debug-macro.S
*
* Debugging macro include header
*
* Copyright (C) 1994-1999 Russell King
* Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <mach/mx23.h>
#include <mach/mx28.h>
#ifdef CONFIG_SOC_IMX23
#ifdef UART_PADDR
#error "CONFIG_DEBUG_LL is incompatible with multiple archs"
#endif
#define UART_PADDR MX23_DUART_BASE_ADDR
#endif
#ifdef CONFIG_SOC_IMX28
#ifdef UART_PADDR
#error "CONFIG_DEBUG_LL is incompatible with multiple archs"
#endif
#define UART_PADDR MX28_DUART_BASE_ADDR
#endif
#define UART_VADDR MXS_IO_ADDRESS(UART_PADDR)
.macro addruart, rp, rv
ldr \rp, =UART_PADDR @ physical
ldr \rv, =UART_VADDR @ virtual
.endm
#include <asm/hardware/debug-pl01x.S>

76
arch/arm/mach-mxs/include/mach/uncompress.h Normal file
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/*
* arch/arm/mach-mxs/include/mach/uncompress.h
*
* Copyright (C) 1999 ARM Limited
* Copyright (C) Shane Nay (shane@minirl.com)
* Copyright 2010 Freescale Semiconductor, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef __MACH_MXS_UNCOMPRESS_H__
#define __MACH_MXS_UNCOMPRESS_H__
#include <asm/mach-types.h>
static unsigned long mxs_duart_base;
#define MXS_DUART(x) (*(volatile unsigned long *)(mxs_duart_base + (x)))
#define MXS_DUART_DR 0x00
#define MXS_DUART_FR 0x18
#define MXS_DUART_FR_TXFE (1 << 7)
#define MXS_DUART_CR 0x30
#define MXS_DUART_CR_UARTEN (1 << 0)
/*
* The following code assumes the serial port has already been
* initialized by the bootloader. If it's not, the output is
* simply discarded.
*/
static void putc(int ch)
{
if (!mxs_duart_base)
return;
if (!(MXS_DUART(MXS_DUART_CR) & MXS_DUART_CR_UARTEN))
return;
while (!(MXS_DUART(MXS_DUART_FR) & MXS_DUART_FR_TXFE))
barrier();
MXS_DUART(MXS_DUART_DR) = ch;
}
static inline void flush(void)
{
}
#define MX23_DUART_BASE_ADDR 0x80070000
#define MX28_DUART_BASE_ADDR 0x80074000
static inline void __arch_decomp_setup(unsigned long arch_id)
{
switch (arch_id) {
case MACH_TYPE_MX23EVK:
mxs_duart_base = MX23_DUART_BASE_ADDR;
break;
case MACH_TYPE_MX28EVK:
mxs_duart_base = MX28_DUART_BASE_ADDR;
break;
default:
break;
}
}
#define arch_decomp_setup() __arch_decomp_setup(arch_id)
#define arch_decomp_wdog()
#endif /* __MACH_MXS_UNCOMPRESS_H__ */