ARM: AM33xx: PRM: Implement REBOOT_COLD

Historically AM33xx performed warm software reset even though requested
(and default) was REBOOT_COLD. Reflect the de-facto default mode in
/sys/kernel/reboot/mode correctly and implement the real REBOOT_COLD
(if configured explicitly).

Tested-by: Matthias Michel <matthias.michel@siemens.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
Message-ID: <20240221154614.3549951-2-alexander.sverdlin@siemens.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

ARM: OMAP2+: am33xx-restart: fix function name in kernel-doc

Use the correct name in kernel-doc notation to prevent a
kernel-doc warning:

am33xx-restart.c:20: warning: expecting prototype for am3xx_restart(). Prototype was for am33xx_restart() instead

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: patches@armlinux.org.uk
Message-ID: <20240117011004.22669-2-rdunlap@infradead.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

Based on 2 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 version 2 as
published by the free software foundation

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 #

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

ARM: OMAP2+: PRM: provide generic API for system reset

This patch combines the various prm_warm_reset calls under a common
API prm_reset_system, and adds the SoC specific implementation under
prm_ll_data.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

ARM: AM33xx: PRM: move global warm reset implementation to driver

Moved the implementation from am33xx-restart.c to the prm33xx.c file to
isolate the PRM register accesses to be private for PRM driver.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Acked-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

ARM: OMAP2+: am33xx-restart: trigger warm reset on omap2+ boards

Currently the cold reset was triggered. It happened due to oposite offsets
of cold/warm flags in PRM_RSTST and PRM_RSTCTRL registers.

Signed-off-by: Matus Ujhelyi <ujhelyi.m@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

reboot: arm: change reboot_mode to use enum reboot_mode

Preparing to move the parsing of reboot= to generic kernel code forces
the change in reboot_mode handling to use the enum.

[akpm@linux-foundation.org: fix arch/arm/mach-socfpga/socfpga.c]
Signed-off-by: Robin Holt <holt@sgi.com>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Russ Anderson <rja@sgi.com>
Cc: Robin Holt <holt@sgi.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

ARM: OMAP2+: AM33xx: Add SoC specific restart hook

Add restart hook so that DTS based AM33xx builds can restart
the platform.

Tested-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Jean-Sebastien A. Beaudry <jsabeaudry@handyem.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>