Commit Graph

75730 Commits

Author SHA1 Message Date
Simon Glass
2c21256b27 hash: Use Kconfig to enable hashing in host tools and SPL
At present when building host tools, we force CONFIG_SHAxxx to be enabled
regardless of the board Kconfig setting. This is done in the image.h
header file.

For SPL we currently just assume the algorithm is desired if U-Boot proper
enables it.

Clean this up by adding new Kconfig options to enable hashing on the host,
relying on CONFIG_IS_ENABLED() to deal with the different builds.

Add new SPL Kconfigs for hardware-accelerated hashing, to maintain the
current settings.

This allows us to drop the image.h code and the I_WANT_MD5 hack.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2021-10-08 15:53:26 -04:00
Simon Glass
603d15a572 spl: cypto: Bring back SPL_ versions of SHA
Unfortunately these were removed by mistake. This means that adding hash
support to SPL brings in all software algorithms, with a substantial
increase in code size.

The origin of the problem was renaming them to SPL_FIT_xxx and then these
were removed altogether in a later commit.

Add them back. This aligns with CONFIG_MD5, for example, which has an SPL
variant.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: f5bc9c25f3 ("image: Rename SPL_SHAxxx_SUPPORT to SPL_FIT_SHAxxx")
Fixes: eb5171ddec ("common: Remove unused CONFIG_FIT_SHAxxx selectors")
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2021-10-08 15:53:26 -04:00
Simon Glass
e02b3fd4b9 image: Add Kconfig options for FIT in the tools build
In preparation for enabling CONFIG_IS_ENABLED() on the host build, add
some options to enable the various FIT options expected in these tools.
This will ensure that the code builds correctly when CONFIG_TOOLS_xxx
is distinct from CONFIG_xxx.

Drop some #ifdefs which are immediately unnecessary (many more are in
later patches).

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2021-10-08 15:53:26 -04:00
Simon Glass
5500a408dd kconfig: Add tools support to CONFIG_IS_ENABLED()
At present we must separately test for the host build for many options,
since we force them to be enabled. For example, CONFIG_FIT is always
enabled in the host tools, even if CONFIG_FIT is not enabled by the
board itself.

It would be more convenient if we could use, for example,
CONFIG_IS_ENABLED(FIT) and get CONFIG_HOST_FIT, when building for the
host. Add support for this.

With this and the tools_build() function, we should be able to remove all
the #ifdefs currently needed in code that is build by tools and targets.

This will be even nicer when we move to using CONFIG(xxx) everywhere,
since all the #ifdef and IS_ENABLED/CONFIG_IS_ENABLED stuff will go away.

Signed-off-by: Simon Glass <sjg@chromium.org>
Suggested-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk> # b4f73886
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2021-10-08 15:53:26 -04:00
Simon Glass
c9d6b5b5dc compiler: Rename host_build() to tools_build()
With the new TOOLS_LIBCRYPTO and some other changes, it seems that we are
heading towards calling this a tools build rather than a host build,
although of course it does happen on the host.

I cannot think of anything built by the host which cannot be described as
a tool, so rename this function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
2021-10-08 15:53:26 -04:00
Simon Glass
4ed37abc49 image: Remove ifdefs around image_setup_linux() el at
Drop some more ifdefs in image-board.c and also the FPGA part of bootm.c
which calls into it.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
c5a68d29e3 image: Avoid #ifdefs for manual relocation
Add a macro to handle manually relocating a pointer. Update the iamge code
to use this to avoid needing #ifdefs.

This also fixes a bug where the 'done' flag was not set.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
2ac00c0505 image: Create a function to do manual relocation
Rather than adding an #ifdef and open-coding this calculation, add a
helper function to handle it. Use this in the image code.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
5d3248a688 image: Split host code out into its own file
To avoid having #ifdefs in a few functions which are completely different
in the board and host code, create a new image-host.c file.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
3d2a47f11c image: Fix up checkpatch warnings in image-board.c
Tidy up the warnings.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
41506ff5a5 image: Split board code out into its own file
To avoid a large #ifdef in the image.c file, move the affected code into
a separate file.

Avoid any style fix-ups for easier review. Those are in the next patch.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
458b30af66 image: Update image_decomp() to avoid ifdefs
Adjust this function so that preprocessor macros are not needed. With
this, the host build uses more of the same header files as the target
build.

Rather than definining CONFIG_SYS_MALLOC_LEN, add a CONSERVE_MEMORY
define, since that is the purpose of the value.

This appears to have no impact on code size from a spot check of a few
boards (snow, firefly-rk3288, boston32r2el, m53menlo).

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
5a4f10d71b gzip: Avoid use of u64
The gzip API uses the u64 type in it, which is not available in the host
build. This makes it impossible to include the header file.

We could make this type available, but it seems unnecessary. Limiting the
compression size to that of the 'unsigned long' type seems good enough. On
32-bit machines the limit then becomes 4GB, which likely exceeds available
RAM anyway, therefore it should be sufficient. On 64-bit machines this is
effectively u64 anyway.

Update the header file and implementation to use 'ulong' instead of 'u64'.

Add a definition of u32 for the cases that seem to need exactly that
length. This should be safe enough.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
02ace2cd49 image: Update zstd to avoid reporting error twice
The zstd implementation prints the error in image_decomp() which is
incorrect and does not match other algorithms. Drop this and let the
caller report the error.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
b876eb87e9 image: Avoid switch default in image_decomp()
At present this function is full of preprocessor macros. Adjust it to
check for an unsupported algorithm after the switch(). This will allow
us to drop the macros.

Fix up the return-value path and an extra blank line while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
918adf8e07 btrfs: Use U-Boot API for decompression
Use the common function to avoid code duplication.

Acked-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
94d0a2efc0 zstd: Create a function for use from U-Boot
The existing zstd API requires the same sequence of calls to perform its
task. Create a helper for U-Boot, to avoid code duplication, as is done
with other compression algorithms. Make use of of this from the image
code.

Note that the zstd code lacks a test in test/compression.c and this should
be added by the maintainer.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
c45b7920db compiler: Add a comment to host_build()
This function should have a comment explaining what it does. Add one.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
67bc59df05 Add support for an owned buffer
When passing a data buffer back from a function, it is not always clear
who owns the buffer, i.e. who is responsible for freeing the memory used.
An example of this is where multiple files are decompressed from the
firmware image, using a temporary buffer for reading (since the
compressed data has to live somewhere) and producing a temporary or
permanent buffer with the resuilts.

Where the firmware image can be memory-mapped, as on x86, the compressed
data does not need to be buffered, but the complexity of having a buffer
which is either allocated or not, makes the code hard to understand.

Introduce a new 'abuf' which supports simple buffer operations:

- encapsulating a buffer and its size
- either allocated with malloc() or not
- able to be reliably freed if necessary
- able to be converted to an allocated buffer if needed

This simple API makes it easier to deal with allocated and memory-mapped
buffers.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Simon Glass
930c887e0f lib: Add memdup()
Add a function to duplicate a memory region, a little like strdup().

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-10-08 15:53:26 -04:00
Tom Rini
0caf37e973 Merge https://source.denx.de/u-boot/custodians/u-boot-marvell
- a37xx: pci: Increase PCIe IO size from 64 KiB to 1 MiB (Pali)
- phy: marvell: a3700: Misc improvements (Pali)
- a38x serdes cleanup (Pali)
- A3720 PCIe enhancements (Pali & Marek)
- mvebu: mvebu_armada-8k: Puzzle M801 enhancements (Robert)
- mvebu: x530: Remove custom kwbimage.cfg (Chris)
- mvebu: Select SPL_SKIP_LOWLEVEL_INIT on ARMADA_32BIT (Stefan)
2021-10-08 08:02:47 -04:00
Patrice Chotard
089e433e56 board: dh_stm32mp1: Remove gpio_hog_probe_all() from board
DM_GPIO_HOG flag has been replaced by GPIO_HOG flag since a while in
commit 49b10cb492 ("gpio: fixes for gpio-hog support").

And furthermore, gpio_hog_probe_all() is already called in board_r.c.
So gpio_hog_probe() can be removed from stm32mp1.c.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Marek Vasut <marex@denx.de>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-10-08 08:46:10 +02:00
Patrice Chotard
d901d76eca board: stm32mp1: Remove gpio_hog_probe_all() from board
DM_GPIO_HOG flag has been replaced by GPIO_HOG flag since a while in
commit 49b10cb492 ("gpio: fixes for gpio-hog support").

And furthermore, gpio_hog_probe_all() is already called in board_r.c.
So gpio_hog_probe() can be removed from stm32mp1.c.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-10-08 08:46:02 +02:00
Patrick Delaunay
c31cf40096 i2c: stm32f7: compute i2cclk only one time
Compute i2cclk only one time in stm32_i2c_compute_timing()
and remove setup parameter (accessible in i2c_priv).

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:41 +02:00
Patrick Delaunay
6338b45888 i2c: stm32f7: add support for DNF i2c-digital-filter binding
Add the support for the i2c-digital-filter binding, allowing to enable
the digital filter via the device-tree and indicate its value in the DT

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrick Delaunay
6bbb14f018 i2c: stm32f7: fix configuration of the digital filter
The digital filter related computation are present in the driver
however the programming of the filter within the IP is missing.
The maximum value for the DNF is wrong and should be 15 instead of 16.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrick Delaunay
0959999891 i2c: stm32f7: support DT binding i2c-analog-filter
Replace driver internally coded enabling/disabling of the
analog-filter with the DT binding "i2c-analog-filter".

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrice Chotard
2aaac1787a arm: dts: stm32: Add i2c-analog-filter property in I2C nodes for stm32h743
Add i2c-analog-filter property in I2C nodes to enable analog
filter feature.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrice Chotard
5d59bd553b arm: dts: stm32: Add i2c-analog-filter property in I2C nodes for stm32f746
Add i2c-analog-filter property in I2C nodes to enable analog
filter feature.

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrick Delaunay
1fd9eb68d6 i2c: stm32f7: move driver data of each instance in a privdata
Today all the I2C instance point on the same global
variable stm32_i2c_setup according the compatible: i2c_priv->setup =
pointer to the same driver data.

This patch changes this driver data (stm32f7_setup and stm32mp15_setup)
to a const struct and move the timing struct 'setup' as element of i2c
privdata, initialized in stm32_ofdata_to_platdata() with the driver
configuration data.

This patch solves issues when several I2C instance have not the same
clock source or not the same configuration: each timing setup is saved
is the I2C privdata.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
2021-10-08 08:42:40 +02:00
Patrice Chotard
81b2445af4 spi: stm32: Add ofdata_to_platdata() callback
Parse DT in ofdata_to_platdata() callback instead of probe().

Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
2021-10-08 08:41:47 +02:00
Chris Packham
1ead6c20bd ARM: mvebu: x530: Remove custom kwbimage.cfg
Commit ca1a4c8632 ("mvebu: select boot device at SoC level") made it
unnecessary for the A385 boards to have their own kwbimage.cfg but as
the x530 was in flight at the time it was added with it's own
kwbimage.cfg. Remove the custom kwbimage.cfg as the SoC level file is
suitable.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Robert Marko
bdce2124ac arm: mvebu: mvebu_armada-8k: drop Puzzle M801 early init code
Since the CP1 pinctrl is not properly set in the DTS, there is no
need for setting the pinctrl by writing hardcoded values to the MPP
registers.

So, drop the code relating to that.

Fixes: 87c220d0 ("arm: mvebu: mvebu_armada-8k: Add support for initializing iEi Puzzle-M801 networking")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Robert Marko
cfb7102d8d arm: mvebu: dts: m801: correct CP1 pinctrl
Current CP1 pinctrl that is set on the Puzzle M801 is incorrect.
CP1 pins are only used for the SMI bus and the MSS I2C, all other
pins are just GPIO-s.

Due to this being set completely wrong, the pinctrl was actually
ended up being hardcoded in the board_early_init_f() step so that
SMI would work.

That is obviously not the right thing to do, so convert the register
hex values that were being written to individual pin modes and set it
in the DTS.
Add the SMI pins to the CP1 MDIO node as otherwise CP1 pinctrl does
not get probed without an consumer.

Fixes: 2ae2b8a2 ("arm: mvebu: Initial iEi Puzzle-M801 support")
Signed-off-by: Robert Marko <robert.marko@sartura.hr>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Stefan Roese
cf47a8cf8f arm: mvebu: Select SPL_SKIP_LOWLEVEL_INIT on ARMADA_32BIT
Select SPL_SKIP_LOWLEVEL_INIT on 32bit Armada platforms via Kconfig,
as this was removed from mach/config.h in a2ac2b96 ("Convert
CONFIG_SKIP_LOWLEVEL_INIT et al to Kconfig").

Signed-off-by: Stefan Roese <sr@denx.de>
Fixes: a2ac2b96 ("Convert CONFIG_SKIP_LOWLEVEL_INIT et al to Kconfig")
Cc: Tom Rini <trini@konsulko.com>
Cc: Marek Behún <kabel@kernel.org>
Cc: Pali Rohár <pali@kernel.org>
Tested-by: Pali Rohár <pali@kernel.org>
2021-10-08 08:37:55 +02:00
Marek Behún
8247c90e92 arm: a37xx: pci: Update private structure documentation
There were several changes for this structure but the documentation was
not changed at the time. Fix this.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Marek Behún
96a3c989dc arm: a37xx: pci: Cosmetic change
Update indentation in driver's private structure.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Pali Rohár
1d7ad68559 arm: a37xx: pci: Handle propagation of CRSSVE bit from PCIe Root Port
Now that PCI Bridge (PCIe Root Port) for Aardvark is emulated in U-Boot,
add support for handling and propagation of CRSSVE bit.

When CRSSVE bit is unset (default), driver has to reissue config
read/write request on CRS response.

CRSSVE bit is supported only when CRSVIS bit is provided in read-only
Root Capabilities register. So manually inject this CRSVIS bit into read
response for that register.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Pali Rohár
95e101e86a arm: a37xx: pci: Do not automatically enable bus mastering on PCI Bridge
Now that PCI Bridge is working for the PCIe Root Port, U-Boot's PCI_PNP
code automatically enables memory access and bus mastering when needed.

We do not need to enable it when setting the HW up.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Pali Rohár
cb056005dc arm: a37xx: pci: Add support for accessing PCI Bridge on root bus
Aardvark does not have a real PCIe Root Port device on the root bus.
Instead it has PCIe registers of PCIe Root Port device mapped in
internal Aardvark memory space starting at offset 0xc0.

The PCIe Root Port itself is normally available as a PCI Bridge device
on the root bus with bus number zero. Aardvark instead has the
configuration registers of this PCI Bridge at offset 0x00 of Aardvark's
memory space, but the class code of this device is Mass Storage
Controller (0x010400), instead of PCI Bridge (0x600400), which causes
U-Boot to fail to recognize it as a P2P Bridge

Add a hook into the pcie_advk_read_config() / pcie_advk_write_config()
functions to redirect access for root bus from PIO transfer to this
internal Aardvark memory space. This will allow U-Boot to access
configuration space of this PCI Bridge which represents PCIe Root Port.

Redirect access to PCI Bridge registers in range 0x10 - 0x34 to driver's
internal buffer (cfgcache[]). This is because at those addresses
Aardvark has different registers, incompatible with config space of a
PCI Bridge.

Redirect access to PCI Bridge register PCI_ROM_ADDRESS1 (0x38) to
Aardvark internal address for that register (0x30).

When reading PCI Bridge register PCI_HEADER_TYPE, set it explicitly to
value Type 1 (PCI_HEADER_TYPE_BRIDGE) as PCI Bridge must be of Type 1.

When writing to PCI_PRIMARY_BUS or PCI_SECONDARY_BUS registers on this
PCI Bridge, correctly update driver's first_busno and sec_busno
variables, so that pcie_advk_addr_valid() function can check if address
of any device behind the root bus is valid and that PIO transfers are
started with correct config type (1 vs 0), which is required for
accessing devices behind some PCI bridge after the root bus.

U-Boot's PCI_PNP code sets primary and secondary bus numbers as relative
to the configured bus number of the root bus. This is done so that
U-Boot can support multiple PCIe host bridges or multiple root port
buses, when internal bus numbers are different.

Now that root bus is available, update code in pcie_advk_read_config()
and pcie_advk_write_config() functions to correctly calculate real
Aardvark bus number of the target device from U-Boot's bus number as:
  busno = PCI_BUS(bdf) - dev_seq(bus)

Stefan: Small fix of header masking as suggested by Pali.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:37:55 +02:00
Pali Rohár
6b2771cb19 arm: a37xx: pci: Fix pcie_advk_link_up()
Aardvark reports Disabled and Hot Reset LTSSM states as values >= 0x20.
Link is not up in these states, so fix pcie_advk_link_up() function.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
de72930433 arm: mvebu: a38x: serdes: Update comment about PCIE*_ENABLE_* defines
These are part of SOC_CONTROL_REG1 register, not PEX_CAPABILITIES_REG.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
28c935b5ee arm: mvebu: a38x: serdes: Remove unused PCIe macros and functions
Remove unused PCIe functions from SerDes code. They are unused and are
duplicated either from generic PCIe code or from pci_mvebu.c.

Remove also unused PCIe macros from SerDes code. They are just obfuscated
variants of standards macros in include/pci.h or in pci_mvebu.c.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
177ee6c77e arm: mvebu: a38x: serdes: Don't configure PCIe cards in SerDes init code
This code is trying to parse PCIe config space of PCIe card connected on
the other end of link and then is trying to force 5.0 GT/s speed via Target
Link Speed bits in PCIe Root Port Link Control 2 Register on the local part
of link if it sees that card supports 5.0 GT/s via Max Link Speed bits in
Link Capabilities Register.

The code is incorrect for more reasons:
- Accessing config space of an endpoint card cannot be done immediately.
  If the PCIe link is not up, reading vendor/device ID registers will
  return all ones.
- Parsing is incomplete, so it can cause issues even for working cards.

Moreover there is no need to force speed to 5.0 GT/s via Target Link Speed
bits on PCIe Root Port Link Control 2 Register. Hardware changes speed from
2.5 GT/s to 5.0 GT/s autonomously when it is supported.

Most importantly, this code does not change link speed at all, since
because after updating Target Link Speed bits on PCIe Root Port Link
Control 2 Register, it is required to retrain the link, and the code for
that is completely missing.

The code was probably needed for making buggy endpoint cards work. Such a
workaround, though, should be implemented via PCIe subsystem (via quirks,
for example), as buggy cards could also affect other PCIe controllers.

Note that this code is fully unrelated to a38x SerDes code and really
should not have been included in SerDes initialization. Usage of magic
constants without names and comments made this SerDes code hard to read and
understand.

Remove this PCIe application code from low level SerDes code. As this code
is configuring only 5.0 GT/s part, in the worst case, it could leave buggy
cards at the initial speed of 2.5 GT/s (if somehow before this change they
could have been "upgraded" to 5.0 GT/s speed even with missing link
retraining). Compliant cards which just need longer initialization should
work better after this change.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
db5ea818ce arm: mvebu: a38x: serdes: Don't overwrite PCI device ID
PCI device ID is part of the PCIe controller SoC / revision. For Root
Complex mode (which is the default and the only mode supported currently
by U-Boot and Linux kernel), it is PCI device ID of PCIe Root Port device.

If there is some issue with this device ID, it should be set / updated by
PCIe controller driver (pci_mvebu.c), as this register resides in address
space of the controller. It shouldn't be done in SerDes initialization
code.

In the worst case (a specific board for example) it could be done via
U-Boot's weak function board_pex_config().

But it should not be overwritten globally for all A38x devices.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
3fc8b90d68 arm: mvebu: a38x: serdes: Don't set PCIe Common Clock Configuration
Enabling Common Clock Configuration bit in PCIe Root Port Link Control
Register should not be done unconditionally. It is enabled by operating
system as part of ASPM. Also after enabling Common Clock Configuration it
is required to do more work, like retraining link. Some cards may be broken
due to this incomplete Common Clock Configuration and some cards are broken
and do not support ASPM at all.

Remove this incomplete code for Common Clock Configuration. It really
should not be done in SerDes code as it is not related to SerDes, but to
PCIe subsystem.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
3bedbcc3aa arm: mvebu: a38x: serdes: Don't overwrite read-only SAR PCIe registers
Device/Port Type bits of PCIe Root Port PCI Express Capabilities Register
are read-only SAR registers and are initialized according to current mode
configured by PCIe controller. Changing PCIe controller mode (from Root
Complex mode to Endpoint mode or the other way) is possible via PCI
Express Control Register (offset 0x41A00), bit 1 (ConfRoot Complex). This
has to be done in PCIe controller driver (in our case pci_mvebu.c). Note
that default mode is Root Complex.

Maximum Link Speed bits of PCIe Root Port Link Capabilities Register are
platform specific and overwriting them does not make sense. They are set by
PCIe controller according to current SerDes configuration. For A38x it is
5.0 GT/s if SerDes supports appropriate speed.

Maximum Link Width bits of PCIe Root Port Link Capabilities Register are
read-only SAR registers, but unfortunately if this is not set correctly
here, then access PCI config space of the endpoint card behind this Root
Port does not work.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
2d5f51f680 arm: mvebu: a38x: serdes: Add comments for hws_pex_config() code
Add comments to understand what this magic code is doing.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
eb5d31645e arm: mvebu: a38x: serdes: Remove duplicate macro SOC_CTRL_REG
SoC Control 1 Register (offset 0x18204) is already defined by macro
SOC_CONTROL_REG1.

Use macro SOC_CONTROL_REG1 instead of macro SOC_CTRL_REG in ctrl_pex.c
code and remove the other definition.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00
Pali Rohár
cfd4a8ad0f arm: mvebu: a38x: serdes: Add comments and use macros in PCIe code
Replace magic register offsets by macros to make code more readable.
Add comments about what this code is doing.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
2021-10-08 08:33:52 +02:00