linux/arch/powerpc/platforms/44x/misc_44x.S

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * This file contains miscellaneous low-level functions for PPC 44x.
 *    Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.
 */

#include <asm/reg.h>
#include <asm/ppc_asm.h>

	.text

/*
 * Do an IO access in AS1
 */
_GLOBAL(as1_readb)
	mfmsr	r7
	ori	r0,r7,MSR_DS
	sync
	mtmsr	r0
	sync
	isync
	lbz	r3,0(r3)
	sync
	mtmsr	r7
	sync
	isync
	blr

_GLOBAL(as1_writeb)
	mfmsr	r7
	ori	r0,r7,MSR_DS
	sync
	mtmsr	r0
	sync
	isync
	stb	r3,0(r4)
	sync
	mtmsr	r7
	sync
	isync
	blr
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2019-05-27 08:55:01 +02:00			`/* SPDX-License-Identifier: GPL-2.0-or-later */`
[POWERPC] Add powerpc/platforms/44x, disable platforms/4xx for now This prepares for Ebony/440 support by creating an arch/powerpc/platforms/44x directory. It is populated with a single misc_44x.S file, into which is moved the 44x specific reset code from head_44x.S (on the grounds that we should really stop clogging up the head_* files with random asm helper routines). At the same time, we disable the (empty save Kconfig and Makefile) arch/powerpc/platforms/4xx directory from the arch/powerpc/platforms Makefile. Contrary to the comment in arch/powerpc/platforms/4xx/Makefile, attempting to build such an empty Makefile will fail, thus breaking compile for the 44x platforms we're about to add. It can go back in once we start porting some of the 40x platforms (and thus it becomes non-empty). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org> 2007-05-08 12:59:30 +10:00			`/*`
			`* This file contains miscellaneous low-level functions for PPC 44x.`
			`* Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation.`
			`*/`

			`#include <asm/reg.h>`
			`#include <asm/ppc_asm.h>`

			`.text`

[POWERPC] Early serial debug support for PPC44x This adds support for early serial debugging via the built in port on IBM/AMCC PowerPC 44x CPUs. It uses a bolted TLB entry in address space 1 for the UART's mapping, allowing robust debugging both before and after the initialization of the MMU. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> 2007-05-08 12:59:31 +10:00			`/*`
			`* Do an IO access in AS1`
			`*/`
			`_GLOBAL(as1_readb)`
			`mfmsr r7`
			`ori r0,r7,MSR_DS`
			`sync`
			`mtmsr r0`
			`sync`
			`isync`
			`lbz r3,0(r3)`
			`sync`
			`mtmsr r7`
			`sync`
			`isync`
			`blr`

			`_GLOBAL(as1_writeb)`
			`mfmsr r7`
			`ori r0,r7,MSR_DS`
			`sync`
			`mtmsr r0`
			`sync`
			`isync`
			`stb r3,0(r4)`
			`sync`
			`mtmsr r7`
			`sync`
			`isync`
			`blr`