Commit 5414bea9 authored by Arnd Bergmann's avatar Arnd Bergmann
Browse files

ARM: pxa: remove support for MTD_XIP 



Using MTD-XIP does not work on multiplatform kernels because
it requires SoC specific register accesses to be done from
low-level flash handling functions in RAM while the rest of the
kernel sits in flash.

I found no evidence of anyone still actually using this feature,
so remove it from PXA to avoid spending a lot of time on
actually making it work.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent e6acc406

arch/arm/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -413,7 +413,6 @@ config ARCH_DOVE 


config ARCH_PXA

	bool "PXA2xx/PXA3xx-based"

	select ARCH_MTD_XIP

	select ARM_CPU_SUSPEND if PM

	select AUTO_ZRELADDR

	select COMMON_CLK

arch/arm/mach-pxa/include/mach/mtd-xip.h

deleted100644 → 0
+0 −36
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-only */

/*

 * MTD primitives for XIP support. Architecture specific functions

 *

 * Do not include this file directly. It's included from linux/mtd/xip.h

 * 

 * Author:	Nicolas Pitre

 * Created:	Nov 2, 2004

 * Copyright:	(C) 2004 MontaVista Software, Inc.

 */



#ifndef __ARCH_PXA_MTD_XIP_H__

#define __ARCH_PXA_MTD_XIP_H__



#include <mach/regs-ost.h>



/* restored July 2017, this did not build since 2011! */



#define ICIP			io_p2v(0x40d00000)

#define ICMR			io_p2v(0x40d00004)

#define xip_irqpending()	(readl(ICIP) & readl(ICMR))



/* we sample OSCR and convert desired delta to usec (1/4 ~= 1000000/3686400) */

#define xip_currtime()		readl(OSCR)

#define xip_elapsed_since(x)	(signed)((readl(OSCR) - (x)) / 4)



/*

 * xip_cpu_idle() is used when waiting for a delay equal or larger than

 * the system timer tick period.  This should put the CPU into idle mode

 * to save power and to be woken up only when some interrupts are pending.

 * As above, this should not rely upon standard kernel code.

 */



#define xip_cpu_idle()  asm volatile ("mcr p14, 0, %0, c7, c0, 0" :: "r" (1))



#endif /* __ARCH_PXA_MTD_XIP_H__ */