GitHub/mt8127/android_kernel_alcatel_ttab.git
12 years agoARM: 7139/1: fix compilation with CONFIG_ARM_ATAG_DTB_COMPAT and large TEXT_OFFSET
Nicolas Pitre [Mon, 24 Oct 2011 12:30:32 +0000 (13:30 +0100)]
ARM: 7139/1: fix compilation with CONFIG_ARM_ATAG_DTB_COMPAT and large TEXT_OFFSET

If TEXT_OFFSET is too large (e.g. like on MSM) the resulting immediate
argument gets wider than 8 bits.

Noticed by David Brown <davidb@codeaurora.org>

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoMerge branch 'ppi-irq-core-for-rmk' of git://github.com/mzyngier/arm-platforms into...
Russell King [Sun, 23 Oct 2011 13:42:30 +0000 (14:42 +0100)]
Merge branch 'ppi-irq-core-for-rmk' of git://github.com/mzyngier/arm-platforms into devel-stable

12 years agoARM: gic, local timers: use the request_percpu_irq() interface
Marc Zyngier [Fri, 22 Jul 2011 11:52:37 +0000 (12:52 +0100)]
ARM: gic, local timers: use the request_percpu_irq() interface

This patch remove the hardcoded link between local timers and PPIs,
and convert the PPI users (TWD, MCT and MSM timers) to the new
*_percpu_irq interface. Also some collateral cleanup
(local_timer_ack() is gone, and the interrupt handler is strictly
private to each driver).

PPIs are now useable for more than just the local timers.

Additional testing by David Brown (msm8250 and msm8660) and
Shawn Guo (imx6q).

Cc: David Brown <davidb@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Brown <davidb@codeaurora.org>
Tested-by: David Brown <davidb@codeaurora.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
12 years agoARM: gic: consolidate PPI handling
Marc Zyngier [Wed, 20 Jul 2011 15:24:14 +0000 (16:24 +0100)]
ARM: gic: consolidate PPI handling

PPI handling is a bit of an odd beast. It uses its own low level
handling code and is hardwired to the local timers (hence lacking
a registration interface).

Instead, switch the low handling to the normal SPI handling code.
PPIs are handled by the handle_percpu_devid_irq flow.

This also allows the removal of some duplicated code.

Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: David Brown <davidb@codeaurora.org>
Cc: Bryan Huntsman <bryanh@codeaurora.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Brown <davidb@codeaurora.org>
Tested-by: David Brown <davidb@codeaurora.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
12 years agoMerge commit '32cffdd' into ppi-irq-core-for-rmk
Marc Zyngier [Sun, 23 Oct 2011 12:32:19 +0000 (13:32 +0100)]
Merge commit '32cffdd' into ppi-irq-core-for-rmk

12 years agoARM: smp: fix clipping of number of CPUs
Russell King [Thu, 20 Oct 2011 21:04:18 +0000 (22:04 +0100)]
ARM: smp: fix clipping of number of CPUs

Rather than clipping the number of CPUs using the compile-time NR_CPUS
constant, use the runtime nr_cpu_ids value instead.  This allows the
nr_cpus command line option to work as expected.

Cc: <stable@kernel.org>
Reported-by: Mark Salter <msalter@redhat.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoMerge branch 'mach_memory_h' of git://git.linaro.org/people/nico/linux into devel...
Russell King [Tue, 18 Oct 2011 12:40:54 +0000 (13:40 +0100)]
Merge branch 'mach_memory_h' of git://git.linaro.org/people/nico/linux into devel-stable

12 years agoARM: 7115/4: move __exception and friends to asm/exception.h
Jamie Iles [Sat, 8 Oct 2011 10:20:42 +0000 (11:20 +0100)]
ARM: 7115/4: move __exception and friends to asm/exception.h

The definition of __exception_irq_entry for
CONFIG_FUNCTION_GRAPH_TRACER=y needs linux/ftrace.h, but this creates a
circular dependency with it's current home in asm/system.h. Create
asm/exception.h and update all current users.

v4: - rebase to rmk/for-next
v3: - remove redundant includes of linux/ftrace.h
v2: - document the usage restricitions of __exception*

Cc: Zoltan Devai <zdevai@gmail.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7124/1: smp: Add a localtimer handler callable from C code
Shawn Guo [Thu, 6 Oct 2011 14:19:14 +0000 (15:19 +0100)]
ARM: 7124/1: smp: Add a localtimer handler callable from C code

In order to be able to handle localtimer directly from C code instead of
assembly code, introduce handle_local_timer(), which is modeled after
handle_IRQ().

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7123/1: smp: Add an IPI handler callable from C code
Shawn Guo [Thu, 6 Oct 2011 14:18:14 +0000 (15:18 +0100)]
ARM: 7123/1: smp: Add an IPI handler callable from C code

In order to be able to handle IPI directly from C code instead of
assembly code, introduce handle_IPI(), which is modeled after handle_IRQ().

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7100/1: smp_scu: remove __init annotation from scu_enable()
Shawn Guo [Sun, 25 Sep 2011 07:25:43 +0000 (08:25 +0100)]
ARM: 7100/1: smp_scu: remove __init annotation from scu_enable()

When Cortex-A9 MPCore resumes from Dormant or Shutdown modes,
SCU needs to be re-enabled.  This patch removes __init annotation
from function scu_enable(), so that platform resume procedure can
call it to re-enable SCU.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7061/1: gic: convert logical CPU numbers into physical numbers
Will Deacon [Tue, 23 Aug 2011 21:20:03 +0000 (22:20 +0100)]
ARM: 7061/1: gic: convert logical CPU numbers into physical numbers

The GIC driver must convert logical CPU numbers passed in from Linux
into physical CPU numbers that are understood by the hardware.

This patch uses the new cpu_logical_map macro for performing the
conversion inside the GIC driver.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7060/1: smp: populate logical CPU mapping during boot
Will Deacon [Tue, 23 Aug 2011 21:19:29 +0000 (22:19 +0100)]
ARM: 7060/1: smp: populate logical CPU mapping during boot

To allow booting Linux on a CPU with physical ID != 0, we need to
provide a mapping from the logical CPU number to the physical CPU
number.

This patch adds such a mapping and populates it during boot.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: 7011/1: Add ARM cpu topology definition
Vincent Guittot [Mon, 8 Aug 2011 12:21:59 +0000 (13:21 +0100)]
ARM: 7011/1: Add ARM cpu topology definition

The affinity between ARM processors is defined in the MPIDR register.
We can identify which processors are in the same cluster,
and which ones have performance interdependency. We can define the
cpu topology of ARM platform, that is then used by sched_mc and sched_smt.

The default state of sched_mc and sched_smt config is disable.
When enabled, the behavior of the scheduler can be modified with
sched_mc_power_savings and sched_smt_power_savings sysfs interfaces.

Changes since v4 :
*  Remove unnecessary parentheses and blank lines

Changes since v3 :
* Update the format of printk message
* Remove blank line

Changes since v2 :
* Update the commit message and some comments

Changes since v1 :
* Update the commit message
* Add read_cpuid_mpidr in arch/arm/include/asm/cputype.h
* Modify header of arch/arm/kernel/topology.c
* Modify tests and manipulation of MPIDR's bitfields
* Modify the place and dependancy of the config
* Modify Noop functions

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: switch from NO_MACH_MEMORY_H to NEED_MACH_MEMORY_H
Nicolas Pitre [Sat, 3 Sep 2011 02:26:55 +0000 (22:26 -0400)]
ARM: switch from NO_MACH_MEMORY_H to NEED_MACH_MEMORY_H

Given that we want the default to not have any <mach/memory.h> and given
that there are now fewer cases where it is still provided than the cases
where it is not at this point, this makes sense to invert the logic and
just identify the exception cases.

The word "need" instead of "have" was chosen to construct the config
symbol so not to suggest that having a mach/memory.h file is actually
a feature that one should aim for.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-s5p64x0: remove mach/memory.h
Nicolas Pitre [Sat, 3 Sep 2011 01:51:43 +0000 (21:51 -0400)]
ARM: mach-s5p64x0: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-s3c64xx: remove mach/memory.h
Nicolas Pitre [Sat, 3 Sep 2011 01:48:28 +0000 (21:48 -0400)]
ARM: mach-s3c64xx: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: plat-mxc: remove mach/memory.h
Nicolas Pitre [Sat, 3 Sep 2011 01:45:26 +0000 (21:45 -0400)]
ARM: plat-mxc: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-prima2: remove mach/memory.h
Nicolas Pitre [Sat, 3 Sep 2011 01:18:52 +0000 (21:18 -0400)]
ARM: mach-prima2: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-zynq: remove mach/memory.h
Nicolas Pitre [Fri, 2 Sep 2011 21:22:03 +0000 (17:22 -0400)]
ARM: mach-zynq: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-bcmring: remove mach/memory.h
Nicolas Pitre [Fri, 2 Sep 2011 21:09:17 +0000 (17:09 -0400)]
ARM: mach-bcmring: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-davinci: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:57 +0000 (22:52 -0400)]
ARM: mach-davinci: remove mach/memory.h

Move some DDR2 related defines into a private <mach/ddr2.h> beforehand.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-pxa: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:57 +0000 (22:52 -0400)]
ARM: mach-pxa: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-ixp4xx: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:57 +0000 (22:52 -0400)]
ARM: mach-ixp4xx: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-h720x: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:56 +0000 (22:52 -0400)]
ARM: mach-h720x: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-vt8500: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:56 +0000 (22:52 -0400)]
ARM: mach-vt8500: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-s5pc100: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-s5pc100: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-tegra: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-tegra: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: plat-tcc: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: plat-tcc: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-mmp: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-mmp: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-cns3xxx: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-cns3xxx: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-nuc93x: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-nuc93x: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-mxs: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: mach-mxs: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: spear: remove mach/memory.h and plat/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:55 +0000 (22:52 -0400)]
ARM: spear: remove mach/memory.h and plat/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-msm: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-msm: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-gemini: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-gemini: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-lpc32xx: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-lpc32xx: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-netx: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-netx: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-versatile: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-versatile: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-ux500: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-ux500: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-nomadik: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:54 +0000 (22:52 -0400)]
ARM: mach-nomadik: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-iop32x: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-iop32x: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-pnx4008: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-pnx4008: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-w90x900: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-w90x900: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-vexpress: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-vexpress: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-mv78xx0: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-mv78xx0: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-s3c2410: remove memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:53 +0000 (22:52 -0400)]
ARM: mach-s3c2410: remove memory.h

This also removes the mach/s3c2400 version which was probably never used
due to the fact that we have this line in arch/arm/Makefile:

machine-$(CONFIG_ARCH_S3C2410)          := s3c2410 s3c2400 [...]

This is later used to construct the search path for:

The compiler would be looking into mach-s3c2410 and picking up this
version first.  Any config that was actually expecting the mach-s3c2400
version was therefore producing a broken kernel binary.  Not relying on
any of them anymore would fix that issue.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: 7127/1: hw_breakpoint: skip v7-specific reset on v6 cores
Will Deacon [Fri, 7 Oct 2011 14:57:55 +0000 (15:57 +0100)]
ARM: 7127/1: hw_breakpoint: skip v7-specific reset on v6 cores

ARMv6 cores do not implement the DBGOSLAR register, so we don't need to
try and clear it on boot. Furthermore, the VCR is zeroed out of reset,
so we don't need to zero it explicitly when a CPU comes online.

Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agogenirq: Fix fatfinered fixup really
Thomas Gleixner [Tue, 4 Oct 2011 16:43:57 +0000 (18:43 +0200)]
genirq: Fix fatfinered fixup really

Putting the argument inside the quote does not really help.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
12 years agogenirq: percpu: allow interrupt type to be set at enable time
Marc Zyngier [Fri, 30 Sep 2011 09:48:47 +0000 (10:48 +0100)]
genirq: percpu: allow interrupt type to be set at enable time

As request_percpu_irq() doesn't allow for a percpu interrupt to have
its type configured (it is generally impossible to configure it on all
CPUs at once), add a 'type' argument to enable_percpu_irq().

This allows some low-level, board specific init code to be switched to
a generic API.

[ tglx: Added WARN_ON argument ]

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
12 years agogenirq: Add support for per-cpu dev_id interrupts
Marc Zyngier [Fri, 23 Sep 2011 16:03:06 +0000 (17:03 +0100)]
genirq: Add support for per-cpu dev_id interrupts

The ARM GIC interrupt controller offers per CPU interrupts (PPIs),
which are usually used to connect local timers to each core. Each CPU
has its own private interface to the GIC, and only sees the PPIs that
are directly connect to it.

While these timers are separate devices and have a separate interrupt
line to a core, they all use the same IRQ number.

For these devices, request_irq() is not the right API as it assumes
that an IRQ number is visible by a number of CPUs (through the
affinity setting), but makes it very awkward to express that an IRQ
number can be handled by all CPUs, and yet be a different interrupt
line on each CPU, requiring a different dev_id cookie to be passed
back to the handler.

The *_percpu_irq() functions is designed to overcome these
limitations, by providing a per-cpu dev_id vector:

int request_percpu_irq(unsigned int irq, irq_handler_t handler,
   const char *devname, void __percpu *percpu_dev_id);
void free_percpu_irq(unsigned int, void __percpu *);
int setup_percpu_irq(unsigned int irq, struct irqaction *new);
void remove_percpu_irq(unsigned int irq, struct irqaction *act);
void enable_percpu_irq(unsigned int irq);
void disable_percpu_irq(unsigned int irq);

The API has a number of limitations:
- no interrupt sharing
- no threading
- common handler across all the CPUs

Once the interrupt is requested using setup_percpu_irq() or
request_percpu_irq(), it must be enabled by each core that wishes its
local interrupt to be delivered.

Based on an initial patch by Thomas Gleixner.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1316793788-14500-2-git-send-email-marc.zyngier@arm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
12 years agoARM: mach-iop33x: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:52 +0000 (22:52 -0400)]
ARM: mach-iop33x: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-omap2: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:52 +0000 (22:52 -0400)]
ARM: mach-omap2: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
12 years agoARM: OMAP: move OMAP1 memory config from plat/memory.h to its mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:52 +0000 (22:52 -0400)]
ARM: OMAP: move OMAP1 memory config from plat/memory.h to its mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
12 years agoARM: mach-orion5x: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:52 +0000 (22:52 -0400)]
ARM: mach-orion5x: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-kirkwood: remove mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:51 +0000 (22:52 -0400)]
ARM: mach-kirkwood: remove mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-dove: remove include/mach/memory.h
Nicolas Pitre [Wed, 6 Jul 2011 02:52:51 +0000 (22:52 -0400)]
ARM: mach-dove: remove include/mach/memory.h

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: prepare for removal of a bunch of <mach/memory.h> files
Nicolas Pitre [Wed, 6 Jul 2011 02:52:51 +0000 (22:52 -0400)]
ARM: prepare for removal of a bunch of <mach/memory.h> files

When the CONFIG_NO_MACH_MEMORY_H symbol is selected by a particular
machine class, the machine specific memory.h include file is no longer
used and can be removed.  In that case the equivalent information can
be obtained dynamically at runtime by enabling CONFIG_ARM_PATCH_PHYS_VIRT
or by specifying the physical memory address at kernel configuration time.

If/when all instances of mach/memory.h are removed then this symbol could
be removed.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: mach-davinci: clean up debug-macro.S
Nicolas Pitre [Fri, 2 Sep 2011 00:50:14 +0000 (20:50 -0400)]
ARM: mach-davinci: clean up debug-macro.S

This achieves two goals:

1) Get rid of davinci_uart_v2p() and davinci_uart_p2v() which were the
   last users of PLAT_PHYS_OFFSET.

2) Remove the probing of the M bit in the CP15 control reg and make
   the access to the .data variables completely position independent.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
12 years agoARM: mach-davinci: make DAVINCI_UART_INFO into a relative offset
Nicolas Pitre [Fri, 2 Sep 2011 00:32:21 +0000 (20:32 -0400)]
ARM: mach-davinci: make DAVINCI_UART_INFO into a relative offset

This is the first step to remove PLAT_PHYS_OFFSET usage from the debug
UART code.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Kevin Hilman <khilman@ti.com>
12 years agoARM: mach-omap2: clean up debug-macro.S
Nicolas Pitre [Thu, 1 Sep 2011 04:48:04 +0000 (00:48 -0400)]
ARM: mach-omap2: clean up debug-macro.S

This achieves two goals:

1) Get rid of omap_uart_v2p() and omap_uart_p2v() which were the last users
   of PLAT_PHYS_OFFSET.

2) Remove the probing of the M bit in the CP15 control reg and make
   the access to the .data variables completely position independent.

There is a catch though: the busyuart macro needs to know where the LSR
register is which might be at a different offset depending on the hardware.
Given that this macro is given only two registers and that one of them
must be preserved, the trick is to always pass the LSR register address
around, and deduce the base address for the THR register by masking out
the LSR offset in senduart instead.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
12 years agoARM: mach-omap1: clean up debug-macro.S
Nicolas Pitre [Thu, 1 Sep 2011 23:17:43 +0000 (19:17 -0400)]
ARM: mach-omap1: clean up debug-macro.S

This achieves two goals:

1) Get rid of omap_uart_v2p() and omap_uart_p2v() which were the last users
   of PLAT_PHYS_OFFSET.

2) Remove the probing of the M bit in the CP15 control reg and make
   the access to the .data variables completely position independent.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
12 years agoARM: plat-omap: make OMAP_UART_INFO into a relative offset
Nicolas Pitre [Wed, 31 Aug 2011 17:57:37 +0000 (13:57 -0400)]
ARM: plat-omap: make OMAP_UART_INFO into a relative offset

This is the first step to remove PLAT_PHYS_OFFSET usage from the debug
UART code.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
12 years agoARM: add an extra temp register to the low level debugging addruart macro
Nicolas Pitre [Thu, 1 Sep 2011 02:55:46 +0000 (22:55 -0400)]
ARM: add an extra temp register to the low level debugging addruart macro

Some platforms (like OMAP not to name it) are doing rather complicated
hacks just to determine the base UART address to use.  Let's give their
addruart macro some slack by providing an extra work register which will
allow for much needed cleanups.

This is basically a no-op as this commit is only adding the extra argument
to the macro but no one is using it yet.

Signed-off-by: nicolas Pitre <nicolas.pitre@linaro.org>
Reviewed-by: Kevin Hilman <khilman@ti.com>
12 years agomusb_debugfs.c: remove unneeded includes on ARM
Nicolas Pitre [Tue, 30 Aug 2011 04:08:49 +0000 (00:08 -0400)]
musb_debugfs.c: remove unneeded includes on ARM

Nothing actually requires that <mach/hardware.h>, <mach/memory.h> nor
<asm/mach-types.h> be included here.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Felipe Balbi <balbi@ti.com>
12 years agoMerge branch 'for_3_2/for-rmk/arm_cpu_pm' of git://gitorious.org/omap-sw-develoment...
Russell King [Mon, 26 Sep 2011 08:36:36 +0000 (09:36 +0100)]
Merge branch 'for_3_2/for-rmk/arm_cpu_pm' of git://gitorious.org/omap-sw-develoment/linux-omap-dev into devel-stable

12 years agoARM: mm: Add strongly ordered descriptor support.
Santosh Shilimkar [Tue, 28 Jun 2011 19:42:56 +0000 (12:42 -0700)]
ARM: mm: Add strongly ordered descriptor support.

On certain architectures, there might be a need to mark certain
addresses with strongly ordered memory attributes to avoid ordering
issues at the interconnect level.

On OMAP4, the asynchronous bridge buffers can only be drained
with strongly ordered accesses and hence the need to mark the
memory strongly ordered.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Woodruff Richard <r-woodruff2@ti.com>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agoARM: vfp: Fix the comment to make it consistent with the code.
Santosh Shilimkar [Fri, 2 Sep 2011 15:42:36 +0000 (21:12 +0530)]
ARM: vfp: Fix the comment to make it consistent with the code.

Function vfp_force_reload() clears vfp_current_hw_state, so
update the comment accordingly.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
12 years agoARM: gic: Allow gic arch extensions to provide irqchip flags
Colin Cross [Mon, 13 Jun 2011 00:45:59 +0000 (00:45 +0000)]
ARM: gic: Allow gic arch extensions to provide irqchip flags

Tegra can benefit from the IRQCHIP_MASK_ON_SUSPEND flag, allow it
to be passed to the gic irq chip.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agoARM: vfp: Use cpu pm notifiers to save vfp state
Colin Cross [Thu, 10 Feb 2011 10:08:32 +0000 (02:08 -0800)]
ARM: vfp: Use cpu pm notifiers to save vfp state

When the cpu is powered down in a low power mode, the vfp
registers may be reset.

This patch uses CPU_PM_ENTER and CPU_PM_EXIT notifiers to save
and restore the cpu's vfp registers.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agoARM: gic: Use cpu pm notifiers to save gic state
Colin Cross [Thu, 10 Feb 2011 20:54:10 +0000 (12:54 -0800)]
ARM: gic: Use cpu pm notifiers to save gic state

When the cpu is powered down in a low power mode, the gic cpu
interface may be reset, and when the cpu cluster is powered
down, the gic distributor may also be reset.

This patch uses CPU_PM_ENTER and CPU_PM_EXIT notifiers to save
and restore the gic cpu interface registers, and the
CPU_CLUSTER_PM_ENTER and CPU_CLUSTER_PM_EXIT notifiers to save
and restore the gic distributor registers.

Original-author: Gary King <gking@nvidia.com>
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agoARM: Enable CPU_PM notifiers on ARM machines.
Santosh Shilimkar [Sat, 10 Sep 2011 06:00:28 +0000 (11:30 +0530)]
ARM: Enable CPU_PM notifiers on ARM machines.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agocpu_pm: call notifiers during suspend
Colin Cross [Fri, 22 Jul 2011 21:57:09 +0000 (14:57 -0700)]
cpu_pm: call notifiers during suspend

Implements syscore_ops in cpu_pm to call the cpu and
cpu cluster notifiers during suspend and resume,
allowing drivers receiving the notifications to
avoid implementing syscore_ops.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agocpu_pm: Add cpu power management notifiers
Colin Cross [Thu, 10 Feb 2011 10:04:45 +0000 (02:04 -0800)]
cpu_pm: Add cpu power management notifiers

During some CPU power modes entered during idle, hotplug and
suspend, peripherals located in the CPU power domain, such as
the GIC, localtimers, and VFP, may be powered down.  Add a
notifier chain that allows drivers for those peripherals to
be notified before and after they may be reset.

Notified drivers can include VFP co-processor, interrupt controller
and it's PM extensions, local CPU timers context save/restore which
shouldn't be interrupted. Hence CPU PM event APIs  must be called
with interrupts disabled.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-and-Acked-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Kevin Hilman <khilman@ti.com>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
12 years agoMerge branch 'pm' into devel-stable
Russell King [Thu, 22 Sep 2011 21:39:23 +0000 (22:39 +0100)]
Merge branch 'pm' into devel-stable

12 years agoMerge branch 'kprobes-test' of git://git.yxit.co.uk/linux into devel-stable
Russell King [Wed, 21 Sep 2011 07:48:33 +0000 (08:48 +0100)]
Merge branch 'kprobes-test' of git://git.yxit.co.uk/linux into devel-stable

12 years agoARM: pm: add L2 cache cleaning for suspend
Russell King [Thu, 1 Sep 2011 10:57:59 +0000 (11:57 +0100)]
ARM: pm: add L2 cache cleaning for suspend

We need to ensure that state is pushed out from the L2 cache when
suspending so that the resume paths can access their data before the
MMU and caches have been re-initialized.  Add the necessary calls to
__cpu_suspend_save().

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: convert some assembly to C
Russell King [Thu, 1 Sep 2011 10:52:33 +0000 (11:52 +0100)]
ARM: pm: convert some assembly to C

Convert some of the sleep.S guts to C code, which makes it easier to
use our macros and to add L2 cache handling.  We provide a helper
function, __cpu_suspend_save(), which deals with saving the common
state, setting up for resume, and flushing caches.

The remainder left as assembly code is the saving of the CPU general
purpose registers, and allocating space on the stack to save the CPU
specific registers and resume state.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: get rid of cpu_resume_turn_mmu_on
Russell King [Wed, 31 Aug 2011 22:26:18 +0000 (23:26 +0100)]
ARM: pm: get rid of cpu_resume_turn_mmu_on

We don't require cpu_resume_turn_mmu_on as we can combine the ldr
instruction with the following code provided we ensure that
cpu_resume_mmu is aligned for older CPUs.  Note that we also align
to a 32-byte boundary to ensure that the code can't cross a section
boundary.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: no need to save/restore context ID register
Russell King [Sun, 28 Aug 2011 09:30:34 +0000 (10:30 +0100)]
ARM: pm: no need to save/restore context ID register

There is no need to save and restore the context ID register on ARMv6
and ARMv7 with a temporary page table as we write the context ID
register when we switch back to the real page tables for the thread.

Moreover, the temporary page tables do not contain any non-global
mappings, so the context ID value should not be used.  To be safe,
initialize the register to a reserved context ID value.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: only use preallocated page table during resume
Russell King [Sat, 27 Aug 2011 21:39:09 +0000 (22:39 +0100)]
ARM: pm: only use preallocated page table during resume

Only use the preallocated page table during the resume, not while
suspending.  This avoids the overhead of having to switch unnecessarily
to the resume page table in the suspend path.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: preallocate a page table for suspend/resume
Russell King [Fri, 26 Aug 2011 19:28:52 +0000 (20:28 +0100)]
ARM: pm: preallocate a page table for suspend/resume

Preallocate a page table and setup an identity mapping for the MMU
enable code.  This means we don't have to "borrow" a page table to
do this, avoiding complexities with L2 cache coherency.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: pm: force non-zero return value from __cpu_suspend when aborting
Russell King [Sat, 27 Aug 2011 10:17:36 +0000 (11:17 +0100)]
ARM: pm: force non-zero return value from __cpu_suspend when aborting

Ensure that the return value from __cpu_suspend is non-zero when
aborting.  Zero indicates a successful suspend occurred.

Tested-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
12 years agoARM: kprobes: Add introductory comment to test code
Jon Medhurst [Sun, 28 Aug 2011 15:52:14 +0000 (16:52 +0100)]
ARM: kprobes: Add introductory comment to test code

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add some benchmarking to test module
Jon Medhurst [Sun, 28 Aug 2011 15:44:30 +0000 (16:44 +0100)]
ARM: kprobes: Add some benchmarking to test module

These benchmarks show the basic speed of kprobes and verify the success
of optimisations done to the emulation of typical function entry
instructions (i.e. push/stmdb).

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add decoding table test coverage analysis
Jon Medhurst [Sun, 28 Aug 2011 15:38:35 +0000 (16:38 +0100)]
ARM: kprobes: Add decoding table test coverage analysis

This is used to verify that all combinations of CPU instructions
described by the kprobes decoding tables have a test case.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add decoding table self-consistency tests
Jon Medhurst [Sun, 28 Aug 2011 15:35:11 +0000 (16:35 +0100)]
ARM: kprobes: Add decoding table self-consistency tests

These check that the bitmask and match value used in the decoding tables
are self consistent.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add exports for test code
Jon Medhurst [Sat, 27 Aug 2011 11:37:44 +0000 (12:37 +0100)]
ARM: kprobes: Add exports for test code

The test code will be using kprobes' internal decoding tables so we
need to export these for when then the tests are compiled as a module.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add ARM instruction simulation test cases
Jon Medhurst [Sat, 27 Aug 2011 11:41:05 +0000 (12:41 +0100)]
ARM: kprobes: Add ARM instruction simulation test cases

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add Thumb instruction simulation test cases
Jon Medhurst [Sat, 27 Aug 2011 11:40:30 +0000 (12:40 +0100)]
ARM: kprobes: Add Thumb instruction simulation test cases

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Framework for instruction set test cases
Jon Medhurst [Sun, 28 Aug 2011 15:18:43 +0000 (16:18 +0100)]
ARM: kprobes: Framework for instruction set test cases

On ARM we have to simulate/emulate CPU instructions in order to
singlestep them. This patch adds a framework which can be used to
construct test cases for different instruction forms. It is described in
detail in the in-source comments of kprobes-test.c

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add basic API tests
Jon Medhurst [Sun, 28 Aug 2011 15:02:38 +0000 (16:02 +0100)]
ARM: kprobes: Add basic API tests

These test that the different kinds of probes can be successfully placed
into ARM and Thumb code and that the handlers are called correctly when
this code is executed.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoARM: kprobes: Add config option for selecting the ARM kprobes tests
Jon Medhurst [Sat, 27 Aug 2011 11:36:58 +0000 (12:36 +0100)]
ARM: kprobes: Add config option for selecting the ARM kprobes tests

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
12 years agoMerge branch 'for-rmk' of git://linux-arm.org/linux-2.6-wd into devel-stable
Russell King [Fri, 16 Sep 2011 20:45:16 +0000 (21:45 +0100)]
Merge branch 'for-rmk' of git://linux-arm.org/linux-2.6-wd into devel-stable

Conflicts:
arch/arm/mach-imx/mach-cpuimx27.c

12 years agoMerge branch 'zImage_DTB_append' of git://git.linaro.org/people/nico/linux into devel...
Russell King [Wed, 14 Sep 2011 23:02:28 +0000 (00:02 +0100)]
Merge branch 'zImage_DTB_append' of git://git.linaro.org/people/nico/linux into devel-stable

12 years agoARM: zImage: prevent constant copy+rebuild of lib1funcs.S
Nicolas Pitre [Wed, 14 Sep 2011 04:16:21 +0000 (00:16 -0400)]
ARM: zImage: prevent constant copy+rebuild of lib1funcs.S

The rule to copy this file doesn't have to be forced.  However
lib1funcs.[So] have to be listed amongst the targets.

This prevents zImage from being recreated needlessly.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
12 years agoARM: zImage: allow supplementing appended DTB with traditional ATAG data
Nicolas Pitre [Wed, 14 Sep 2011 02:37:07 +0000 (22:37 -0400)]
ARM: zImage: allow supplementing appended DTB with traditional ATAG data

Some old bootloaders can't be updated to a device tree capable one,
yet they provide ATAGs with memory configuration, the ramdisk address,
the kernel cmdline string, etc.  To allow a device tree enabled
kernel to be used with such bootloaders, it is necessary to convert those
ATAGs into FDT properties and fold them into the DTB appended to zImage.

Currently the following ATAGs are converted:

ATAG_CMDLINE
ATAG_MEM
ATAG_INITRD2

If the corresponding information already exists in the appended DTB, it
is replaced, otherwise the required node is created to hold it.

The code looks for ATAGs at the location pointed by the value of r2 upon
entry into the zImage code.  If no ATAGs are found there, an attempt at
finding ATAGs at the typical 0x100 offset from start of RAM is made.
Otherwise the DTB is left unchanged.

Thisstarted from an older patch from John Bonesio <bones@secretlab.ca>,
with contributions from David Brown <davidb@codeaurora.org>.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
12 years agoARM: zImage: gather some string functions into string.c
Nicolas Pitre [Wed, 14 Sep 2011 01:42:55 +0000 (21:42 -0400)]
ARM: zImage: gather some string functions into string.c

This is a small subset of string functions needed by commits to come.
Except for memcpy() which is unchanged from its original location, their
implementation is meant to be small, and -Os is enforced to prevent gcc
from doing pointless loop unrolling.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
12 years agoARM: zImage: make sure appended DTB doesn't get overwritten by kernel .bss
Nicolas Pitre [Sun, 12 Jun 2011 05:07:33 +0000 (01:07 -0400)]
ARM: zImage: make sure appended DTB doesn't get overwritten by kernel .bss

The appended DTB gets relocated with the decompressor code to get out
of the way of the decompressed kernel.  However the kernel's .bss section
may be larger than the relocated code and data, and then the DTB gets
overwritten.  Let's make sure the relocation takes care of moving zImage
far enough so no such conflict with .bss occurs.

Thanks to Tony Lindgren <tony@atomide.com> for figuring out this issue.

While at it, let's clean up the code a bit so that the wont_overwrite
symbol is used while determining if a conflict exists, making the above
change more precise as well as eliminating some ARM/THUMB alternates.

Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>
12 years agoARM: zImage: Allow the appending of a device tree binary
John Bonesio [Fri, 27 May 2011 22:45:50 +0000 (18:45 -0400)]
ARM: zImage: Allow the appending of a device tree binary

This patch provides the ability to boot using a device tree that is appended
to the raw binary zImage (e.g. cat zImage <filename>.dtb > zImage_w_dtb).

Signed-off-by: John Bonesio <bones@secretlab.ca>
[nico: ported to latest zImage changes plus additional cleanups/improvements]
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Tony Lindgren <tony@atomide.com>
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Tested-by: Dave Martin <dave.martin@linaro.org>
Tested-by: Thomas Abraham <thomas.abraham@linaro.org>