Commit Graph

13 Commits

Author SHA1 Message Date
Thomas Gleixner
af873fcece treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
Based on 1 normalized pattern(s):

  license terms gnu general public license gpl version 2

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 161 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528170027.447718015@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:22 -07:00
Michael van der Westhuizen
0bbe6b5a73 ARM: 8388/1: tcm: Don't crash when TCM banks are protected by TrustZone
Fixes the TCM initialisation code to handle TCM banks that are
present but inaccessible due to TrustZone configuration.  This is
the default case when enabling the non-secure world.  It may also
be the case that that the user decided to use TCM for TrustZone.

This change has exposed a bug in handling of TCM where no TCM bank
was usable (the 0 size TCM case).  This change addresses the
resulting hang.

This code only handles the ARMv6 TCMTR register format, and will not
work correctly on boards that use the ARMv7 (or any other) format.
This is handled by performing an early exit from the initialisation
function when the TCMTR reports any format other than v6.

Signed-off-by: Michael van der Westhuizen <michael@smart-africa.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2015-06-06 10:37:28 +01:00
Russell King
2e2c9de207 ARM: add permission annotations to MT_MEMORY* mapping types
Document the permissions which the various MT_MEMORY* mapping types
will provide.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-12-11 09:53:14 +00:00
Joonsoo Kim
de40614e92 ARM: 7694/1: ARM, TCM: initialize TCM in paging_init(), instead of setup_arch()
tcm_init() call iotable_init() and it use early_alloc variants which
do memblock allocation. Directly using memblock allocation after
initializing bootmem should not permitted, because bootmem can't know
where are additinally reserved.
So move tcm_init() to a safe place before initalizing bootmem.

(On the U300)

Tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2013-04-17 16:53:24 +01:00
David Howells
9f97da78bf Disintegrate asm/system.h for ARM
Disintegrate asm/system.h for ARM.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Russell King <linux@arm.linux.org.uk>
cc: linux-arm-kernel@lists.infradead.org
2012-03-28 18:30:01 +01:00
Linus Walleij
90b9222ec6 ARM: 7199/2: only look for TCM on ARMv5 and later
The Integrator AP/CP can have a varying set of core modules, some
(like ARM920T) are so old that trying to read the TCM status register
with CP15 will make them hang. So we need to make sure that we are
running on v5 or later in order to be able to activate this for
the Integrator. (The Integrator with CM926EJ-S has 32+32 kb of TCM
memory.)

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-12-13 08:52:02 +00:00
Linus Walleij
201043f227 ARM: 6985/1: export functions to determine the presence of I/DTCM
By allowing code to detect whether DTCM or ITCM is present, code paths
involving TCM can be avoided when running on platforms that lack it.
This is good for creating single kernels across several archs, if some
of them utilize TCM but others don't.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-07-06 20:49:45 +01:00
Linus Walleij
9715efb8dc ARM: 6984/1: enhance TCM robustness
The PB11MPCore reports "3" DTCM banks, but anything above 2 is an
"undefined" value, so push this to become 0. Further add some checks
if code is compiled to TCM even if there is no D/ITCM present in the
system, and if we can really fit the compiled code. We don't do the
BUG() since it's not helpful, it's better to deal with non-present
TCM dynamically. If there is nothing compiled to the TCM and no TCM
is detected, it will now just shut up even if TCM support is enabled.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-07-06 20:49:45 +01:00
Russell King
f4117ac9e2 ARM: P2V: separate PHYS_OFFSET from platform definitions
This uncouple PHYS_OFFSET from the platform definitions, thereby
facilitating run-time computation of the physical memory offset.

Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Acked-by: Magnus Damm <damm@opensource.se>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Wan ZongShun <mcuos.com@gmail.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Jiandong Zheng <jdzheng@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2011-02-17 23:26:55 +00:00
Linus Walleij
1dbd30e989 ARM: 6225/1: make TCM allocation static and common for all archs
This changes the TCM handling so that a fixed area is reserved at
0xfffe0000-0xfffeffff for TCM. This areas is used by XScale but
XScale does not have TCM so the mechanisms are mutually exclusive.

This change is needed to make TCM detection more dynamic while
still being able to compile code into it, and is a must for the
unified ARM goals: the current TCM allocation at different places
in memory for each machine would be a nightmare if you want to
compile a single image for more than one machine with TCM so it
has to be nailed down in one place.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-07-27 10:42:38 +01:00
Linus Walleij
598509779e ARM: 6223/1: support multiple TCM banks
CPUs v6 and up support multiple TCM banks, for example an ITCM of
8k is supplied in two 4k banks. This makes the TCM work on the
1176JZF-S devchip.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-07-18 20:29:48 +01:00
Linus Walleij
cb9d7707cd ARM: 6222/1: add memory types for the TCMs
The earlier TCM memory regions were mapped as MT_MEMORY_UNCACHED
which doesn't really work on platforms supporting the new v6
features like the NX bit. Add unique MT_MEMORY_[I|D]TCM types
instead.

Cc: Nicolas Pitre <nico@fluxnic.net>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2010-07-18 20:29:47 +01:00
Linus Walleij
bc581770cf ARM: 5580/2: ARM TCM (Tightly-Coupled Memory) support v3
This adds the TCM interface to Linux, when active, it will
detect and report TCM memories and sizes early in boot if
present, introduce generic TCM memory handling, provide a
generic TCM memory pool and select TCM memory for the U300
platform.

See the Documentation/arm/tcm.txt for documentation.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-09-15 22:11:05 +01:00