Normally buildman wil try to configure U-Boot for a particular board on the
first commit that it builds in a series. Subsequent commits are built
without reconfiguring which normally works. Where it doesn't, buildman
automatically reconfigures and retries.

To fully emulate the way MAKEALL works, we should have an option to disable
this optimisation.

Add a -C option to cause buildman to always reconfigure on each commit.
Signed-off-by: NSimon Glass <sjg@chromium.org>

The linker scripts of sh2/sh3/sh4 are almost the same.
The difference among them is essentially only one line.

They can be consolidated into a single file, arch/sh/cpu/u-boot.lds
by re-writing the diffrent line as follows:

	KEEP(*/start.o	(.text))
Signed-off-by: NMasahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: NNobuhiro Iwamatsu <iwamatsu@nigauri.org>

After a build fails buildman will reconfigure and try again, if it did not
reconfigure before the build. However it doesn't actually keep track of
whether it did reconfigure on the previous attempt.

Fix that logic to avoid a pointless rebuild. This speeds things up quite a
bit for failing builds. Previously they would always be built twice.

Change-Id: Ib37f21320baa7c60bed98f4042c0b7ed7c0dc85e
Signed-off-by: NSimon Glass <sjg@chromium.org>

Generally a build failure with a particular commit cannot be fixed except
by changing that commit. Changing the commit will automatically cause
buildman to retry when you run it again: buildman sees that the commit
hash is different and that it has no previous build result for the new
commit hash.

However sometimes the build failure is due to a toolchain issue or some
other environment problem. In that case, retrying failed builds may yield
a different result.

Add a flag to retry failed builds. This differs from the force rebuild
flag (-f) in that it will not rebuild commits which are already marked as
succeeded.

Series-to: u-boot

Change-Id: Iac4306df499d65ff0888b1c60f06fc162a6faad8

Uclasses should be named, so add a name for the demo uclass.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Some boards will have devices which are not in the device tree and do not
have platform data. They may be programnatically created, for example.
Add a hook which boards can use to bind those devices early in boot.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Add a debug message for when a device tree node has no driver. Also reword
the warning when a device fails to bind, which was misleading.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Some devices (particularly bus devices) must track their children, knowing
when a new child is added so that it can be set up for communication on the
bus.

Add a child_pre_probe() method to provide this feature, and a corresponding
child_post_remove() method.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Some device types can have child devices and want to store information
about them. For example a USB flash stick attached to a USB host
controller would likely use this space. The controller can hold
information about the USB state of each of its children.

The data is stored attached to the child device in the 'parent_priv'
member. It can be auto-allocated by dm when the child is probed. To
do this, add a per_child_auto_alloc_size value to the parent driver.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Devices can have childen that can be addressed by a simple index, the
sequence number or a device tree offset. Add functions to access a child
in each of these ways.

The index is typically used as a fallback when the sequence number is not
available. For example we may use a serial UART with sequence number 0 as
the console, but if no UART has sequence number 0, then we can fall back
to just using the first UART (index 0).

The device tree offset function is useful for buses, where they want to
locate one of their children. The device tree can be scanned to find the
offset of each child, and that offset can then find the device.
Signed-off-by: NSimon Glass <sjg@chromium.org>

At present only root nodes in the device tree are scanned for devices.
But some devices can have children. For example a SPI bus may have
several children for each of its chip selects.

Add a function which scans subnodes and binds devices for each one. This
can be used for the root node scan also, so change it.

A device can call this function in its bind() or probe() methods to bind
its children.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Fix up the style of a few comments and add/clarify a few others.
Signed-off-by: NSimon Glass <sjg@chromium.org>

This simple function returns the node offset of a named alias.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Don't allow access to uclasses before they have been initialised.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Each device that was bound from a device tree has an node that caused it to
be bound. Add functions that find and return a device based on a device tree
offset.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Add this information to 'dm tree' and 'dm uclass' commands.
Signed-off-by: NSimon Glass <sjg@chromium.org>

In U-Boot it is pretty common to number devices from 0 and access them
on the command line using this numbering. While it may come to pass that
we will move away from this numbering, the possibility seems remote at
present.

Given that devices within a uclass will have an implied numbering, it
makes sense to build this into driver model as a core feature. The cost
is fairly small in terms of code and data space.

With each uclass having numbered devices we can ask for SPI port 0 or
serial port 1 and receive a single device.

Devices typically request a sequence number using aliases in the device
tree. These are resolved when the device is probed, to deal with conflicts.
Sequence numbers need not be sequential and holes are permitted.

At present there is no support for sequence numbers using static platform
data. It could easily be added to 'struct driver_info' if needed, but it
seems better to add features as we find a use for them, and the use of -1
to mean 'no sequence' makes the default value somewhat painful.
Signed-off-by: NSimon Glass <sjg@chromium.org>

This command currently activates devices as it lists them. This is not
desirable since it changes the system state. Fix it and avoid printing
a newline if there are no devices in a uclass.
Signed-off-by: NSimon Glass <sjg@chromium.org>

The device display for 'dm tree' and 'dm uclass' is mostly the same, so
move it into a common function.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Aliases are used to provide U-Boot's numbering of devices, such as:

aliases {
	spi0 = "/spi@12330000";
}

spi@12330000 {
	...
}

This tells us that the SPI controller at 12330000 is considered to be the
first SPI controller (SPI 0). So we have a numbering for the SPI node.

Add a function that returns the numbering for a node assume that it exists
in the list of aliases.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Several functions will use this same pattern, so bring it into a function.
Signed-off-by: NSimon Glass <sjg@chromium.org>

For sandbox we have a fallback console which is used very early in
U-Boot, before serial drivers are available. Rather than try to guess
when to switch to the real console, add a flag so we can be sure. This
makes sure that sandbox can always output a panic() message, for example,
and avoids silent failure (which is very annoying in sandbox).
Signed-off-by: NSimon Glass <sjg@chromium.org>

If the console is not present, we try to reduce overhead by stopping any
output in vprintf(), before it gets to putc(). This is of dubious merit
in general, but in the case of sandbox it is incorrect since we have a
fallback console which reports errors very early in U-Boot. If this is
defeated U-Boot can hang or exit with no indication of what is wrong.

Remove the optimisation for sandbox.
Signed-off-by: NSimon Glass <sjg@chromium.org>

The current functions for adding and removing devices require a device name.
This is not convenient for driver model, which wants to store a pointer to
the relevant device. Add new functions which provide this feature and adjust
the old ones to call these.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Initialise devices marked 'pre-reloc' and make them available prior to
relocation. Note that this requires pre-reloc malloc() to be available.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Driver model currently only operates after relocation is complete. In this
state U-Boot typically has a small amount of memory available. In adding
support for driver model prior to relocation we must try to use as little
memory as possible.

In addition, on some machines the memory has not be inited and/or the CPU
is not running at full speed or the data cache is off. These can reduce
execution performance, so the less initialisation that is done before
relocation the better.

An immediately-obvious improvement is to only initialise drivers which are
actually going to be used before relocation. On many boards the only such
driver is a serial UART, so this provides a very large potential benefit.

Allow drivers to mark themselves as 'pre-reloc' which means that they will
be initialised prior to relocation. This can be done either with a driver
flag or with a 'dm,pre-reloc' device tree property.

To support this, the various dm scanning function now take a 'pre_reloc_only'
parameter which indicates that only drivers marked pre-reloc should be
bound.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Drivers are supposed to be able to close down cleanly. To set a good example,
make sandbox shut down its driver model drivers and remove them before exit.

It may be desirable to do the same more generally once driver model is more
widely-used. This could be done during bootm, before U-Boot jumps to the OS.
It seems far too early to make this change.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Add a new method which removes and unbinds all drivers.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NMarek Vasut <marex@denx.de>

The root device should be probed just like any other device. The effect of
this is to mark the device as activated, so that it can be removed (along
with its children) if required.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NMarek Vasut <marex@denx.de>

At present stdio device functions do not get any clue as to which stdio
device is being acted on. Some implementations go to great lengths to work
around this, such as defining a whole separate set of functions for each
possible device.

For driver model we need to associate a stdio_dev with a device. It doesn't
seem possible to continue with this work-around approach.

Instead, add a stdio_dev pointer to each of the stdio member functions.

Note: The serial drivers have the same problem, but it is not strictly
necessary to fix that to get driver model running. Also, if we convert
serial over to driver model the problem will go away.

Code size increases by 244 bytes for Thumb2 and 428 for PowerPC.

22: stdio: Pass device pointer to stdio methods
       arm: (for 2/2 boards)  all +244.0  bss -4.0  text +248.0
   powerpc: (for 1/1 boards)  all +428.0  text +428.0
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NMarek Vasut <marex@denx.de>
Reviewed-by: NMarek Vasut <marex@denx.de>

There is no point in setting a structure's memory to NULL when it has
already been zeroed with memset().

Also, there is no need to create a stub function for stdio to call - if the
function is NULL it will not be called.

This is a clean-up, with no change in functionality.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Acked-by: NMarek Vasut <marex@denx.de>

Rather than reusing the 'reg' property, use an explicit property for the
expected ping value used in testing.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Driver model does not support SPL yet, so we should not use the GPIO
uclass for SPL.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Tun on DEBUG in malloc(). This adds code space and slows things down but
for sandbox this is acceptable. We gain the ability to check for memory
leaks in tests.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Enable this for sandbox so that we will be able to use driver model before
relocation.
Signed-off-by: NSimon Glass <sjg@chromium.org>

Set up and zero global data before board_init_f() is called so that we can
remove the need for CONFIG_SYS_GENERIC_GLOBAL_DATA.
Signed-off-by: NSimon Glass <sjg@chromium.org>

If we are to have driver model before relocation we need to support some
way of calling memory allocation routines.

The standard malloc() is pretty complicated:

1. It uses some BSS memory for its state, and BSS is not available before
relocation

2. It supports algorithms for reducing memory fragmentation and improving
performace of free(). Before relocation we could happily just not support
free().

3. It includes about 4KB of code (Thumb 2) and 1KB of data. However since
this has been loaded anyway this is not really a problem.

The simplest way to support pre-relocation malloc() is to reserve an area
of memory and allocate it in increasing blocks as needed. This
implementation does this.

To enable it, you need to define the size of the malloc() pool as described
in the README. It will be located above the pre-relocation stack on
supported architectures.

Note that this implementation is only useful on machines which have some
memory available before dram_init() is called - this includes those that
do no DRAM init (like tegra) and those that do it in SPL (quite a few
boards). Enabling driver model preior to relocation for the rest of the
boards is left for a later exercise.
Signed-off-by: NSimon Glass <sjg@chromium.org>

At present sandbox defines CONFIG_SYS_GENERIC_GLOBAL_DATA, meaning that
the global_data pointer is set up in board_init_f().

If we set up and zero the global data before calling board_init_f() then we
don't need to define CONFIG_SYS_GENERIC_GLOBAL_DATA.

Make this change to simplify the init process.
Signed-off-by: NSimon Glass <sjg@chromium.org>

These don't really serve any purpose in the modern age. On the other hand
they show up as annoying control characters in my editor, which then happily
removes them.

I believe we can drop these characters from the file.
Signed-off-by: NSimon Glass <sjg@chromium.org>