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u-boot/drivers/core/Kconfig
Dario Binacchi d64b9cdcd4 fdt: translate address if #size-cells = <0> 
The __of_translate_address routine translates an address from the
device tree into a CPU physical address. A note in the description of
the routine explains that the crossing of any level with
since inherited from IBM. This does not happen for Texas Instruments, or
at least for the beaglebone device tree. Without this patch, in fact,
the translation into physical addresses of the registers contained in the
am33xx-clocks.dtsi nodes would not be possible. They all have a parent
with #size-cells = <0>.

The CONFIG_OF_TRANSLATE_ZERO_SIZE_CELLS symbol makes translation
possible even in the case of crossing levels with #size-cells = <0>.

The patch acts conservatively on address translation, except for
removing a check within the of_translate_one function in the
drivers/core/of_addr.c file:

+
        ranges = of_get_property(parent, rprop, &rlen);
-       if (ranges == NULL && !of_empty_ranges_quirk(parent)) {
-               debug("no ranges; cannot translate\n");
-               return 1;
-       }
        if (ranges == NULL || rlen == 0) {
                offset = of_read_number(addr, na);
                memset(addr, 0, pna * 4);
		debug("empty ranges; 1:1 translation\n");

There are two reasons:
1 The function of_empty_ranges_quirk always returns false, invalidating
  the following if statement in case of null ranges. Therefore one of
  the two checks is useless.

2 The implementation of the of_translate_one function found in the
  common/fdt_support.c file has removed this check while keeping the one
  about the 1:1 translation.

The patch adds a test and modifies a check for the correctness of an
address in the case of enabling translation also for zero size cells.
The added test checks translations of addresses generated by nodes of
a device tree similar to those you can find in the files am33xx.dtsi
and am33xx-clocks.dtsi for which the patch was created.

The patch was also tested on a beaglebone black board. The addresses
generated for the registers of the loaded drivers are those specified
by the AM335x reference manual.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Tested-by: Dario Binacchi <dariobin@libero.it>
Reviewed-by: Simon Glass <sjg@chromium.org>
2021-01-12 10:58:05 +05:30

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menu "Generic Driver Options"
config DM
bool "Enable Driver Model"
help
This config option enables Driver Model. This brings in the core
support, including scanning of platform data on start-up. If
CONFIG_OF_CONTROL is enabled, the device tree will be scanned also
when available.
config SPL_DM
bool "Enable Driver Model for SPL"
depends on DM && SPL
help
Enable driver model in SPL. You will need to provide a
suitable malloc() implementation. If you are not using the
full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
must provide CONFIG_SPL_SYS_MALLOC_F_LEN to set the size.
In most cases driver model will only allocate a few uclasses
and devices in SPL, so 1KB should be enable. See
CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it.
config TPL_DM
bool "Enable Driver Model for TPL"
depends on DM && TPL
help
Enable driver model in TPL. You will need to provide a
suitable malloc() implementation. If you are not using the
full malloc() enabled by CONFIG_SYS_SPL_MALLOC_START,
consider using CONFIG_SYS_MALLOC_SIMPLE. In that case you
must provide CONFIG_SPL_SYS_MALLOC_F_LEN to set the size.
In most cases driver model will only allocate a few uclasses
and devices in SPL, so 1KB should be enough. See
CONFIG_SPL_SYS_MALLOC_F_LEN for more details on how to enable it.
Disable this for very small implementations.
config DM_WARN
bool "Enable warnings in driver model"
depends on DM
default y
help
Enable this to see warnings related to driver model.
Warnings may help with debugging, such as when expected devices do
not bind correctly. If the option is disabled, dm_warn() is compiled
out - it will do nothing when called.
config SPL_DM_WARN
bool "Enable warnings in driver model wuth SPL"
depends on SPL_DM
help
Enable this to see warnings related to driver model in SPL
The dm_warn() function can use up quite a bit of space for its
strings. By default this is disabled for SPL builds to save space.
Warnings may help with debugging, such as when expected devices do
not bind correctly. If the option is disabled, dm_warn() is compiled
out - it will do nothing when called.
config DM_DEBUG
bool "Enable debug messages in driver model core"
depends on DM
help
Say Y here if you want to compile in debug messages in DM core.
config DM_DEVICE_REMOVE
bool "Support device removal"
depends on DM
default y
help
We can save some code space by dropping support for removing a
device.
Note that this may have undesirable results in the USB subsystem as
it causes unplugged devices to linger around in the dm-tree, and it
causes USB host controllers to not be stopped when booting the OS.
config SPL_DM_DEVICE_REMOVE
bool "Support device removal in SPL"
depends on SPL_DM
default n
help
We can save some code space by dropping support for removing a
device. This is not normally required in SPL, so by default this
option is disabled for SPL.
config DM_STDIO
bool "Support stdio registration"
depends on DM
default y
help
Normally serial drivers register with stdio so that they can be used
as normal output devices. In SPL we don't normally use stdio, so
we can omit this feature.
config DM_SEQ_ALIAS
bool "Support numbered aliases in device tree"
depends on DM
default y
help
Most boards will have a '/aliases' node containing the path to
numbered devices (e.g. serial0 = &serial0). This feature can be
disabled if it is not required.
config SPL_DM_SEQ_ALIAS
bool "Support numbered aliases in device tree in SPL"
depends on SPL_DM
default n
help
Most boards will have a '/aliases' node containing the path to
numbered devices (e.g. serial0 = &serial0). This feature can be
disabled if it is not required, to save code space in SPL.
config SPL_DM_INLINE_OFNODE
bool "Inline some ofnode functions which are seldom used in SPL"
depends on SPL_DM
default y
help
This applies to several ofnode functions (see ofnode.h) which are
seldom used. Inlining them can help reduce code size.
config TPL_DM_INLINE_OFNODE
bool "Inline some ofnode functions which are seldom used in TPL"
depends on TPL_DM
default y
help
This applies to several ofnode functions (see ofnode.h) which are
seldom used. Inlining them can help reduce code size.
config REGMAP
bool "Support register maps"
depends on DM
help
Hardware peripherals tend to have one or more sets of registers
which can be accessed to control the hardware. A register map
models this with a simple read/write interface. It can in principle
support any bus type (I2C, SPI) but so far this only supports
direct memory access.
config SPL_REGMAP
bool "Support register maps in SPL"
depends on SPL_DM
help
Hardware peripherals tend to have one or more sets of registers
which can be accessed to control the hardware. A register map
models this with a simple read/write interface. It can in principle
support any bus type (I2C, SPI) but so far this only supports
direct memory access.
config TPL_REGMAP
bool "Support register maps in TPL"
depends on TPL_DM
help
Hardware peripherals tend to have one or more sets of registers
which can be accessed to control the hardware. A register map
models this with a simple read/write interface. It can in principle
support any bus type (I2C, SPI) but so far this only supports
direct memory access.
config SYSCON
bool "Support system controllers"
depends on REGMAP
help
Many SoCs have a number of system controllers which are dealt with
as a group by a single driver. Some common functionality is provided
by this uclass, including accessing registers via regmap and
assigning a unique number to each.
config SPL_SYSCON
bool "Support system controllers in SPL"
depends on SPL_REGMAP
help
Many SoCs have a number of system controllers which are dealt with
as a group by a single driver. Some common functionality is provided
by this uclass, including accessing registers via regmap and
assigning a unique number to each.
config TPL_SYSCON
bool "Support system controllers in TPL"
depends on TPL_REGMAP
help
Many SoCs have a number of system controllers which are dealt with
as a group by a single driver. Some common functionality is provided
by this uclass, including accessing registers via regmap and
assigning a unique number to each.
config DEVRES
bool "Managed device resources"
depends on DM
help
This option enables the Managed device resources core support.
Device resources managed by the devres framework are automatically
released whether initialization fails half-way or the device gets
detached.
If this option is disabled, devres functions fall back to
non-managed variants. For example, devres_alloc() to kzalloc(),
devm_kmalloc() to kmalloc(), etc.
config DEBUG_DEVRES
bool "Managed device resources debugging functions"
depends on DEVRES
help
If this option is enabled, devres debug messages are printed.
Also, a function is available to dump a list of device resources.
Select this if you are having a problem with devres or want to
debug resource management for a managed device.
If you are unsure about this, Say N here.
config SIMPLE_BUS
bool "Support simple-bus driver"
depends on DM && OF_CONTROL
default y
help
Supports the 'simple-bus' driver, which is used on some systems.
config SPL_SIMPLE_BUS
bool "Support simple-bus driver in SPL"
depends on SPL_DM && SPL_OF_CONTROL
default y
help
Supports the 'simple-bus' driver, which is used on some systems
in SPL.
config SIMPLE_PM_BUS
bool "Support simple-pm-bus driver"
depends on DM && OF_CONTROL && CLK && POWER_DOMAIN
help
Supports the 'simple-pm-bus' driver, which is used for busses that
have power domains and/or clocks which need to be enabled before use.
config OF_TRANSLATE
bool "Translate addresses using fdt_translate_address"
depends on DM && OF_CONTROL
default y
help
If this option is enabled, the reg property will be translated
using the fdt_translate_address() function. This is necessary
on some platforms (e.g. MVEBU) using complex "ranges"
properties in many nodes. As this translation is not handled
correctly in the default simple_bus_translate() function.
If this option is not enabled, simple_bus_translate() will be
used for the address translation. This function is faster and
smaller in size than fdt_translate_address().
config OF_TRANSLATE_ZERO_SIZE_CELLS
bool "Enable translation for zero size cells"
depends on OF_TRANSLATE
default n
help
The routine used to translate an FDT address into a physical CPU
address was developed by IBM. It considers that crossing any level
with #size-cells = <0> makes translation impossible, even if it is
not the way it was specified.
Enabling this option makes translation possible even in the case
of crossing levels with #size-cells = <0>.
config SPL_OF_TRANSLATE
bool "Translate addresses using fdt_translate_address in SPL"
depends on SPL_DM && SPL_OF_CONTROL
default n
help
If this option is enabled, the reg property will be translated
using the fdt_translate_address() function. This is necessary
on some platforms (e.g. MVEBU) using complex "ranges"
properties in many nodes. As this translation is not handled
correctly in the default simple_bus_translate() function.
If this option is not enabled, simple_bus_translate() will be
used for the address translation. This function is faster and
smaller in size than fdt_translate_address().
config TRANSLATION_OFFSET
bool "Platforms specific translation offset"
depends on DM && OF_CONTROL
help
Some platforms need a special address translation. Those
platforms (e.g. mvebu in SPL) can configure a translation
offset by enabling this option and setting the translation_offset
variable in the GD in their platform- / board-specific code.
config OF_ISA_BUS
bool
depends on OF_TRANSLATE
help
Is this option is enabled then support for the ISA bus will
be included for addresses read from DT. This is something that
should be known to be required or not based upon the board
being targeted, and whether or not it makes use of an ISA bus.
The bus is matched based upon its node name equalling "isa". The
busses #address-cells should equal 2, with the first cell being
used to hold flags & flag 0x1 indicating that the address range
should be accessed using I/O port in/out accessors. The second
cell holds the offset into ISA bus address space. The #size-cells
property should equal 1, and of course holds the size of the
address range used by a device.
If this option is not enabled then support for the ISA bus is
not included and any such busses used in DT will be treated as
typical simple-bus compatible busses. This will lead to
mistranslation of device addresses, so ensure that this is
enabled if your board does include an ISA bus.
config DM_DEV_READ_INLINE
bool
default y if !OF_LIVE
config ACPIGEN
bool "Support ACPI table generation in driver model"
default y if SANDBOX || (GENERATE_ACPI_TABLE && !QEMU)
help
This option enables generation of ACPI tables using driver-model
devices. It adds a new operation struct to each driver, to support
things like generating device-specific tables and returning the ACPI
name of a device.
config INTEL_ACPIGEN
bool "Support ACPI table generation for Intel SoCs"
depends on ACPIGEN
help
This option adds some functions used for programatic generation of
ACPI tables on Intel SoCs. This provides features for writing CPU
information such as P states and T stages. Also included is a way
to create a GNVS table and set it up.
config BOUNCE_BUFFER
bool "Include bounce buffer API"
help
Some peripherals support DMA from a subset of physically
addressable memory only. To support such peripherals, the
bounce buffer API uses a temporary buffer: it copies data
to/from DMA regions while managing cache operations.
A second possible use of bounce buffers is their ability to
provide aligned buffers for DMA operations.
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