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Commit 41fa75bc authored by Shawn Guo's avatar Shawn Guo Committed by Uwe Kleine-König
Browse files

ARM: mxs: Add low-level debug UART support 



 - 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: default avatarShawn Guo <shawn.guo@freescale.com>
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
parent 289569f9

arch/arm/mach-mxs/include/mach/debug-macro.S

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+38 −0
Original line number Diff line number Diff line 
/* 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>

arch/arm/mach-mxs/include/mach/uncompress.h

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+76 −0
Original line number Diff line number Diff line 
/*

 *  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__ */