Commit graph

83 commits

Author SHA1 Message Date
Stefan Roese
13f3fcac53 dm: core: Add dev_get_addr_size_index() to retrieve addr and size
The currently available functions accessing the 'reg' property of a
device only retrieve the address. Sometimes its also necessary to
retrieve the size described by the 'reg' property. This patch adds
the new function dev_get_addr_size_index() which retrieves both,
the address and the size described by the 'reg' property.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2016-12-02 21:03:31 -07:00
Masahiro Yamada
6e67f176bb Fix codying style broken by recent libfdt sync
Commit b02e4044ff ("libfdt: Bring in upstream stringlist
functions") broke codying style in some places especially
by inserting an extra whitespace before fdt_stringlist_count().

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-10-24 08:04:42 -04:00
Simon Glass
b02e4044ff libfdt: Bring in upstream stringlist functions
These have now landed upstream. The naming is different and in one case the
function signature has changed. Update the code to match.

This applies the following upstream commits by
Thierry Reding <treding@nvidia.com> :

   604e61e fdt: Add functions to retrieve strings
   8702bd1 fdt: Add a function to get the index of a string
   2218387 fdt: Add a function to count strings

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-10-13 13:54:10 -06:00
Stephen Warren
6e06acb732 fdt: allow fdtdec_get_addr_size_*() to translate addresses
Some code may want to read reg values from DT, but from nodes that aren't
associated with DM devices, so using dev_get_addr_index() isn't
appropriate. In this case, fdtdec_get_addr_size_*() are the functions to
use. However, "translation" (via the chain of ranges properties in parent
nodes) may still be desirable. Add a function parameter to request that,
and implement it. Update all call sites to default to the original
behaviour.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Squashed in build fix from Stephen:
Signed-off-by: Simon Glass <sjg@chromium.org>
2016-08-12 09:20:27 -06:00
Simon Glass
9fa2819009 dm: core: Expand platdata for of-platdata devices
Devices which use of-platdata have their own platdata. However, in many
cases the driver will have its own auto-alloced platdata, for use with the
device tree. The ofdata_to_platdata() method converts the device tree
settings to platdata.

With of-platdata we would not normally allocate the platdata since it is
provided by the U_BOOT_DEVICE() declaration. However this is inconvenient
since the of-platdata struct is closely tied to the device tree properties.
It is unlikely to exactly match the platdata needed by the driver.

In fact a useful approach is to declare platdata in the driver like this:

struct r3288_mmc_platdata {
	struct dtd_rockchip_rk3288_dw_mshc of_platdata;
	/* the 'normal' fields go here */
};

In this case we have dt_platadata available, but the normal fields are not
present, since ofdata_to_platdata() is never called. In fact driver model
doesn't allocate any space for the 'normal' fields, since it sees that there
is already platform data attached to the device.

To make this easier, adjust driver model to allocate the full size of the
struct (i.e. platdata_auto_alloc_size from the driver) and copy in the
of-platdata. This means that when the driver's bind() method is called,
the of-platdata will be present, followed by zero bytes for the empty
'normal field' portion.

A new DM_FLAG_OF_PLATDATA flag is available that indicates that the platdata
came from of-platdata. When the allocation/copy happens, the
DM_FLAG_ALLOC_PDATA flag will be set as well. The dtoc tool is updated to
output the platdata_size field, since U-Boot has no other way of knowing
the size of the of-platdata struct.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-07-14 20:40:24 -06:00
Simon Glass
fd1c2d9b6a dm: core: Rename DM_NAME_ALLOCED to DM_FLAG_NAME_ALLOCED
This is a flag. Adjust the name to be consistent with the other flags.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-07-14 20:40:24 -06:00
Simon Glass
29629eb897 dm: core: Don't use device tree with of-platdata
When CONFIG_SPL_OF_PLATDATA is enabled we should not access the device
tree. Remove all references to this in the core driver-model code.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-07-14 20:40:24 -06:00
Vignesh R
7c61686255 dm: core: implement dev_map_physmem()
This API helps to map physical register addresss pace of device to
virtual address space easily. Its just a wrapper around map_physmem()
with MAP_NOCACHE flag.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Suggested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jagan Teki <jteki@openedev.com>
2016-07-09 20:16:08 +05:30
Stephen Warren
daac3bfee5 dm: allow setting driver_data before/during bind
This will allow a driver's bind function to use the driver data. One
example is the Tegra186 GPIO driver, which instantiates child devices
for each of its GPIO ports, yet supports two different HW instances each
with a different set of ports, and identified by the udevice_id .data
field.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-05-26 20:48:31 -06:00
Mugunthan V N
73443b9e4c drivers: core: device: add support to check dt compatible for a device/machine
Provide an api to check whether the given device or machine is
compatible with the given compat string which helps in making
decisions in drivers based on device or machine compatible.

Idea taken from Linux.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
2016-05-24 11:42:02 -05:00
Simon Glass
a2040facd2 dm: core: Allow device names to be freed automatically
Some devices have a name that is stored in allocated memory. At present
there is no mechanism to free this memory when the device is unbound.

Add a device flag to track whether a name is allocated and a function to
add the flag. Free the memory when the device is unbound.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-05-17 09:54:43 -06:00
Stephen Warren
35732098db fdt: fix dev_get_addr_name node offset
Use the device's own DT offset, not the device's parent's.

Fixes: 43c4d44e33 ("fdt: implement dev_get_addr_name()")
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-05-17 09:54:43 -06:00
Stefan Roese
28027521be dm: core: Add dev_get_addr_ptr() to return a pointer to the reg address
On some platforms (e.g. x86), the return value of dev_get_addr() can't
be assigned to a pointer type variable directly. As there might be a
difference between the size of fdt_addr_t and the pointer type. On
x86 for example, "fdt_addr_t" is 64bit but "void *" only 32bit. So
assigning the register base directly in dev_get_addr() results in this
compilation warning:
  warning: cast to pointer from integer of different size

This patch introduces the new function dev_get_addr_ptr() that
returns a pointer to the 'reg' address that can be used by drivers
in this case.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2016-04-25 07:30:16 +02:00
Stephen Warren
43c4d44e33 fdt: implement dev_get_addr_name()
This function parses the reg property based on an index found in the
reg-names property. This is required for bindings that are written
using reg-names rather than hard-coding indices in reg.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-04-15 08:14:37 -06:00
Stefan Roese
770eb30ed9 dm: device.c: Minor coding-style fix
Fix multi-line comment indentation in device_bind()

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2016-04-14 11:51:39 -06:00
Peng Fan
c3ab985362 dm: core: device: set pinctrl state for pinctrl device
We may have pinmux settings for pinctrl device, like the following
example:
"
&iomuxc {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_hog_1>;
	imx6ul-evk {
		pinctrl_hog_1: hoggrp-1 {
			fsl,pins = <
				MX6UL_PAD_UART1_RTS_B__GPIO1_IO19	0x17059 /* SD1 CD */
				MX6UL_PAD_GPIO1_IO05__USDHC1_VSELECT	0x17059 /* SD1 VSELECT */
				MX6UL_PAD_GPIO1_IO09__GPIO1_IO09        0x17059 /* SD1 RESET */
				MX6UL_PAD_SNVS_TAMPER0__GPIO5_IO00	0x80000000
			>;
		};
	[......]
};
"

We should not only select pinctrl state for non pinctrl devices, we
need also to handle pin mux settings such as pinctrl_log for pinctrl
devices.

So at the end of probing process of pinctrl device, select the default
state of pinctrl device.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
2016-04-14 11:51:39 -06:00
Simon Glass
c6db965f67 dm: Remove device_probe_child()
This function is not used as the use case for it did not eventuate. Remove
it to avoid confusion.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2016-01-28 21:01:23 -07:00
Simon Glass
0379597e55 dm: core: Don't set pinctrl for pinctrl devices
There is sort-of race condition when a pinctrl device is probed. The pinctrl
function is called which may end up using the same device as is being
probed. This results in operations being used before the device is actually
probed.

For now, disallow pinctrl operations on pinctrl devices while probing. An
alternative solution would be to move the operation to later in the
device_probe() function (for pinctrl devices only) but this needs more
thought.

Signed-off-by: Simon Glass <sjg@chromium.org>
2016-01-21 20:42:34 -07:00
Simon Glass
20af3c0a00 dm: core: Call uclass post_bind() after the driver's bind() method
At present the uclass's post_bind() method is called before the driver's
bind() method. This means that the uclass cannot use any of the information
set up by the driver. Move it later in the sequence to permit this.

This is an ordering change which is always fairly major in nature. The main
impact is that devices which have children will not see them appear in their
bind() method. From what I can see, existing drivers do not look at their
children in the bind() method, so this should be safe.

Conceptually this change seems to result in a 'more correct' ordering, since
the uclass (which is broader than the device) gets the last word.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2016-01-20 19:06:22 -07:00
Tom Rini
20d08f59fa Merge branch 'master' of git://www.denx.de/git/u-boot-microblaze 2016-01-13 21:05:17 -05:00
Mugunthan V N
69b41388ba dm: core: Add a new api to get indexed device address
Add new api to get device address based on index.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Acked-by: Jagan Teki <jteki@openedev.com>
[Rebased on master]
Signed-off-by: Jagan Teki <jteki@openedev.com>
2016-01-13 18:54:22 +05:30
Nathan Rossi
4f627c5a59 spl: dm: Add SPL_DM_SEQ_ALIAS config option
The Device Model sequence alias feature is required by some Uclasses.
Instead of disabling the feature for all SPL targets allow it to be
configured.

The config option is disabled by default to reduce code size for targets
that are not interested or do not require this feature.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Marek Vasut <marex@denx.de>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
2016-01-13 13:20:02 +01:00
Stefan Roese
66eaea6cd1 dm: core: Add option to configure an offset for the address translation
Some platforms need to ability to configure an offset to the standard
addresses extracted from the device-tree. This patch allows this by
adding a function to DM to configure this offset (if needed).

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Simon Glass <sjg@chromium.org>
Cc: Simon Glass <sjg@chromium.org>
Fixed space before tab:
Signed-off-by: Simon Glass <sjg@chromium.org>
2016-01-12 10:19:09 -07:00
Simon Glass
bcbe3d1579 dm: Rename dev_get_parentdata() to dev_get_parent_priv()
The current name is inconsistent with other driver model data access
functions. Rename it and fix up all users.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
2015-10-23 09:42:28 -06:00
Stefan Roese
ef5cd33064 dm: core: Enable optional use of fdt_translate_address()
The current "simple" address translation simple_bus_translate() is not
working on some platforms (e.g. MVEBU). As here more complex "ranges"
properties are used in many nodes (multiple tuples etc). This patch
enables the optional use of the common fdt_translate_address() function
which handles this translation correctly.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
2015-10-21 02:25:01 +02:00
Simon Glass
84d26e296a dm: core: Don't use pinctrl for the root device
Currently when driver model starts up it finds the root uclass and the
pinctrl uclass. This is because even the root node handles pinctrl
processing.

But this is not useful. The root node is not a real hardware device so
cannot require any particular pinmux settings. Also it means that the
memory leak tests fails, since they end up freeing more memory than
they allocate: the marker it set after the root device and pinctrl
uclass are allocated, and later once the pinctrl uclass is freed the memory
used by driver model is less than when the marker was set.

If a platform needs 'core' pin mulitplex settings it can do this with
a driver that is probed on start-up. It would be an abuse of the root node
to use this for pinctrl.

To avoid this problem, only process pinctrl settings for non-root nodes.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-10-05 15:47:49 +01:00
Stephen Warren
02464e386b fdt: add new fdt address parsing functions
fdtdec_get_addr_size() hard-codes the number of cells used to represent
an address or size in DT. This is incorrect in many cases depending on
the DT binding for a particular node or property (e.g. it is incorrect
for the "reg" property). In most cases, DT parsing code must use the
properties #address-cells and #size-cells to parse addres properties.

This change splits up the implementation of fdtdec_get_addr_size() so
that the core logic can be used for both hard-coded and non-hard-coded
cases. Various wrapper functions are implemented that support cases
where hard-coded cell counts should or should not be used, and where
the client does and doesn't know the parent node ID that contains the
properties #address-cells and #size-cells.

dev_get_addr() is updated to use the new functions.

Core functionality in fdtdec_get_addr_size_fixed() is widely tested via
fdtdec_get_addr_size(). I tested fdtdec_get_addr_size_auto_noparent() and
dev_get_addr() by manually modifying the Tegra I2C driver to invoke them.

Much of the core implementation of fdtdec_get_addr_size_fixed(),
fdtdec_get_addr_size_auto_parent(), and
fdtdec_get_addr_size_auto_noparent() comes from Thierry Reding's
previous commit "fdt: Fix fdtdec_get_addr_size() for 64-bit".

Based-on-work-by: Thierry Reding <treding@nvidia.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Michal Suchanek <hramrach@gmail.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Dropped #define DEBUG at the top of fdtdec.c:
Signed-off-by: Simon Glass <sjg@chromium.org>
2015-09-15 07:57:13 -06:00
Simon Glass
3346c87625 dm: Improve handling of a missing uclass
When a uclass definition is missing, no drivers in that uclass can operate.
This can happen if a board has a strange collection of options (e.g. the
driver is enabled but the uclass is not).

Unfortunately this is very confusing at present. Starting up driver model
results in a -ENOENT error, which is pretty generic. Quite a big of digging
is needed to get to the root cause.

To help with this, change the error to a very strange one with no other
users in U-Boot. Also add a debug message.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-09-02 21:28:23 -06:00
Masahiro Yamada
d90a5a30de pinctrl: add pin control uclass support
This creates a new framework for handling of pin control devices,
i.e. devices that control different aspects of package pins.

This uclass handles pinmuxing and pin configuration; pinmuxing
controls switching among silicon blocks that share certain physical
pins, pin configuration handles electronic properties such as pin-
biasing, load capacitance etc.

This framework can support the same device tree bindings, but if you
do not need full interface support, you can disable some features to
reduce memory foot print.  Typically around 1.5KB is necessary to
include full-featured uclass support on ARM board (CONFIG_PINCTRL +
CONFIG_PINCTRL_FULL + CONFIG_PINCTRL_GENERIC + CONFIG_PINCTRL_PINMUX),
for example.

We are often limited on code size for SPL.  Besides, we still have
many boards that do not support device tree configuration.  The full
pinctrl, which requires OF_CONTROL, does not make sense for those
boards.  So, this framework also has a Do-It-Yourself (let's say
simple pinctrl) interface.  With CONFIG_PINCTRL_FULL disabled, the
uclass itself provides no systematic mechanism for identifying the
peripheral device, applying pinctrl settings, etc.  They must be
done in each low-level driver.  In return, you can save much memory
footprint and it might be useful especially for SPL.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-31 07:57:29 -06:00
Masahiro Yamada
e6cabe4a6d dm: core: allow device_bind() to not return a device pointer
This is useful when we want to bind a device, but do not need the
pointer to the device.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-31 07:57:29 -06:00
Marek Vasut
628d792c07 dm: core: Add Kconfig for simple bus driver
Add Kconfig entries for the simple-bus driver, both for U-Boot
and for SPL. The simple-bus is enabled by default in U-Boot and
disabled by default in SPL to preserve the original behavior.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
Modified to fit on top of Masahiro's $(SPL) setup:
Signed-off-by: Simon Glass <sjg@chromium.org>
2015-08-31 07:57:26 -06:00
Simon Glass
4e9838c102 dm: Use dev_get_addr() where possible
This is a convenient way for a driver to get the hardware address of a
device, when regmap or syscon are not being used. Change existing callers
to use it as an example to others.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
2015-08-31 07:57:26 -06:00
Bin Meng
cdeb2ba99c dm: core: Fix code reentrancy issue in device_probe_child()
The device might have already been probed during the call to
device_probe() on its parent device (e.g. PCI bridge devices).
In its parent device's probe routine, it might probe all of
its child devices via device_probe() thus the codes reenter
device_probe_child(). To support code reentrancy, test these
allocated memory against NULL to avoid memory leak, and return
to the caller if dev->flags has DM_FLAG_ACTIVATED set after
device_probe() returns, so that we don't mess up the device.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-26 07:54:17 -07:00
Masahiro Yamada
0f9258228e of: clean up OF_CONTROL ifdef conditionals
We have flipped CONFIG_SPL_DISABLE_OF_CONTROL.  We have cleansing
devices, $(SPL_) and CONFIG_IS_ENABLED(), so we are ready to clear
away the ugly logic in include/fdtdec.h:

 #ifdef CONFIG_OF_CONTROL
 # if defined(CONFIG_SPL_BUILD) && !defined(SPL_OF_CONTROL)
 #  define OF_CONTROL 0
 # else
 #  define OF_CONTROL 1
 # endif
 #else
 # define OF_CONTROL 0
 #endif

Now CONFIG_IS_ENABLED(OF_CONTROL) is the substitute.  It refers to
CONFIG_OF_CONTROL for U-boot proper and CONFIG_SPL_OF_CONTROL for
SPL.

Also, we no longer have to cancel CONFIG_OF_CONTROL in
include/config_uncmd_spl.h and scripts/Makefile.spl.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
2015-08-18 13:46:05 -04:00
Masahiro Yamada
0a5804b53a dm: drop CONFIG_DM_DEVICE_REMOVE from uncmd list
We do not want to compile the DM remove code for SPL.  Currently,
we undef it in include/config_uncmd_spl.h (for C files) and in
scripts/Makefile.uncmd_spl (for Makefiles).  This is really ugly.

This commit demonstrates how we can deprecate those two files.

Use $(SPL_) for the entry in the Makfile and CONFIG_IS_ENABLED()
in C files.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2015-08-18 13:46:04 -04:00
Simon Glass
f5c67ea036 dm: core: Add a way to set a device name
Some devices are bound entirely by probing and do not have the benefit of
a device tree to give them a name. This is very common with PCI and USB. In
most cases this is fine, but we should add an official way to set a device
name. This should be called in the device's bind() method.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2015-08-06 07:44:29 -06:00
Masahiro Yamada
e2282d7076 devres: make Devres optional with CONFIG_DEVRES
Currently, Devres requires additional 16 byte for each allocation,
which is not so insignificant in some cases.

Add CONFIG_DEVRES to make this framework optional.
If the option is disabled, devres functions fall back to
non-managed variants.  For example, devres_alloc() to kzalloc(),
devm_kmalloc() to kmalloc(), etc.

Because devres_head is also surrounded by an ifdef conditional,
there is no memory overhead when CONFIG_DEVRES is disabled.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Suggested-by: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-06 07:44:29 -06:00
Masahiro Yamada
608f26c51b devres: introduce Devres (Managed Device Resource) framework
In U-Boot's driver model, memory is basically allocated and freed
in the core framework.  So, low level drivers generally only have
to specify the size of needed memory with .priv_auto_alloc_size,
.platdata_auto_alloc_size, etc.  Nevertheless, some drivers still
need to allocate/free memory on their own in case they cannot
statically know the necessary memory size.  So, I believe it is
reasonable enough to port Devres into U-boot.

Devres, which originates in Linux, manages device resources for each
device and automatically releases them on driver detach.  With devres,
device resources are guaranteed to be freed whether initialization
fails half-way or the device gets detached.

The basic idea is totally the same to that of Linux, but I tweaked
it a bit so that it fits in U-Boot's driver model.

In U-Boot, drivers are activated in two steps: binding and probing.
Binding puts a driver and a device together.  It is just data
manipulation on the system memory, so nothing has happened on the
hardware device at this moment.  When the device is really used, it
is probed.  Probing initializes the real hardware device to make it
really ready for use.

So, the resources acquired during the probing process must be freed
when the device is removed.  Likewise, what has been allocated in
binding should be released when the device is unbound.  The struct
devres has a member "probe" to remember when the resource was
allocated.

CONFIG_DEBUG_DEVRES is also supported for easier debugging.
If enabled, debug messages are printed each time a resource is
allocated/freed.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-06 07:44:29 -06:00
Masahiro Yamada
aed1a4dd88 dm: add DM_FLAG_BOUND flag
Currently, we only have DM_FLAG_ACTIVATED to indicate the device
status, but we still cannot know in which stage is in progress,
binding or probing.

This commit introduces a new flag, DM_FLAG_BOUND, which is set when
the device is really bound, and cleared when it is unbound.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-08-06 07:44:29 -06:00
Simon Glass
f33017716e dm: Support address translation for simple-bus
The 'ranges' property can be used to specify a translation from the system
address to the bus address. Add support for this using the dev_get_addr()
function, which devices should use to find their address.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-08-06 07:44:28 -06:00
Simon Glass
36d7cc17bd dm: core: Add \n to two dm_warn() messages
These should finish with a newline like the others.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:38 -06:00
Masahiro Yamada
1f5dd4700a dm: do not set DM_FLAG_ACTIVATED twice
Currently, DM_FLAG_ACTIVATED is set twice; before calling
uclass_pre_probe_device() and again before calling drv->probe().

It looks like Simon's intention is the first one.
The DM_FLAG_ACTIVATED was moved twice, by commit 02eeb1bbb1
(dm: core: Mark device as active before calling its probe()
method), and then by commit 206d4d2b4b (dm: core: Mark device
as active before calling uclass probe() methods).
The first marking was added by the last move.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:34 -06:00
Simon Glass
132f9bfc9e dm: core: Correct device_get_child_by_of_offset() parameter
This parameter is named 'seq' but should be named 'of_offset'.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:23 -06:00
Simon Glass
2693047acd dm: core: Add a function to find any device from device tree
In some rare cases it is useful to be able to locate a device given a device
tree node offset. An example is when you have an alias that points to a node
and you want to find the associated device. The device may be SPI, MMC or
something else, but you don't need to know the uclass to find it.

Add a function to do a global search for a device, given its device tree
offset.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-07-21 17:39:22 -06:00
Masahiro Yamada
f0f932d620 dm: core: drop device removal error path correctly
Trivial bug fix for commit 5a87c4174d (dm: core: Drop device
removal error path when not supported).

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Simon Glass <sjg@chromium.org>
2015-04-28 16:49:02 -06:00
Simon Glass
5a87c4174d dm: core: Drop device removal error path when not supported
When CONFIG_DM_DEVICE_REMOVE is not enabled, such as in SPL, we cannot
remove or unbind devices and do not expect to get errors when binding
and probing devices. So drop the error path to reduce code size.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-04-23 09:05:52 -06:00
Simon Glass
36fa61dc61 dm: core: Allow sequence alias support to be removed for SPL
In many cases SPL only uses a single serial port and there is no need for
alias sequence support. We will just use the serial port pointed to by
stdout-path in the /chosen node.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-04-23 09:05:51 -06:00
Przemyslaw Marczak
f9c370dcdf dm: core: device: add function: dev_get_uclass_name()
This commit extends the driver model device's API by function:
- dev_get_uclass_name()

And this function returns the device's uclass driver name if:
- given dev pointer, is non_NULL
otherwise, the NULL pointer is returned.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2015-04-22 11:03:15 -06:00
Przemyslaw Marczak
cc73d37b7f dm: core: device: add function: dev_get_driver_ops()
This commit extends the driver model device's API by function:
- dev_get_driver_ops()

And this function returns the device's driver's operations if given:
- dev pointer, is non-NULL
- dev->driver->ops pointer, is non-NULL
in other case the, the NULL pointer is returned.

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2015-04-22 11:03:15 -06:00
Przemyslaw Marczak
5eaed88028 dm: core: Extend struct udevice by '.uclass_platdata' field.
This commit adds 'uclass_platdata' field to 'struct udevice', which
can be automatically allocated at bind. The allocation size is defined
in 'struct uclass_driver' as 'per_device_platdata_auto_alloc_size'.

New device's flag is added: DM_FLAG_ALLOC_UCLASS_PDATA, which is used
for memory freeing at device unbind method.

As for other udevice's fields, a complementary function is added:
- dev_get_uclass_platdata()

Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
2015-04-22 11:03:14 -06:00