linux-kernel - [PATCH 47/48] ARM: pxa: remove support for MTD

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Date:   Tue, 19 Apr 2022 18:38:09 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     robert.jarzmik@...e.fr, linux-arm-kernel@...ts.infradead.org
Cc:     Arnd Bergmann <arnd@...db.de>, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Paul Parsons <lost.distance@...oo.com>,
        Tomas Cech <sleep_walker@...e.com>,
        Sergey Lapin <slapin@...fans.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Helge Deller <deller@....de>, Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-ide@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-input@...r.kernel.org,
        patches@...nsource.cirrus.com, linux-leds@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-rtc@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        alsa-devel@...a-project.org
Subject: [PATCH 47/48] ARM: pxa: remove support for MTD_XIP

From: Arnd Bergmann <arnd@...db.de>

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: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/Kconfig                         |  1 -
 arch/arm/mach-pxa/include/mach/mtd-xip.h | 36 ------------------------
 2 files changed, 37 deletions(-)
 delete mode 100644 arch/arm/mach-pxa/include/mach/mtd-xip.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index eef8cbf20045..ace6c08c8ae2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -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
diff --git a/arch/arm/mach-pxa/include/mach/mtd-xip.h b/arch/arm/mach-pxa/include/mach/mtd-xip.h
deleted file mode 100644
index 4b31bef9e50a..000000000000
--- a/arch/arm/mach-pxa/include/mach/mtd-xip.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/* 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__ */
-- 
2.29.2