It's a preparation for flash support, as there we cannot update
bytes/entries count without erasing entire flash sector.

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

- copyright header to local conventions
- fix a little white space
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

- Turn the copyright header to the local convention
- fix a little white space
- fix flash_sdb_check (must return error -- but it's unused)
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

The optimization is the removal of the retval variable in
bbspi_transfer() and using the val parameter as a "shift register"
that is returned at the end of the function.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

How-to guide for the tool (together with flash-write tool) can be found in
sdbfs.README.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

SQUASH remove flash-read binary: 598d cdf68
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

The issue was due to a bug in gpio_in, which was doing an AND with
the value of GPIO_SPI_MISO, which was set to the pin offset, instead
of what it was set in the include/syscon.h file.

When I copied the gpio functions from include/syscon.h, I overlooked
the fact that the pins for the gpio functions there are set using
wbgen macros that actually perform the shifting, and I simply copied
the functions and redefined the GPIO_SPI_MISO macros as offsets.

The issue has been fixed by redefining the gpio_in function as an
AND with the value (1 << PIN_NR). This fixes everything.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

Signed-off-by: Theodor Stana <t.stana@cern.ch>

For this to work, I also had to add (in flash.c) setting the
entry-point to the right value (the one where the SDB magic is
detected).

The rest of the commit files are just toying around for testing
purposes.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

There was somewhat of a bug in the spec_write_flash function of
flash-write. The memcpy function was not functioning 'as expected',
so I changed the fixed-size buffer for a pointer and malloc-ed it
to the size. This seems to fix the bug.

The issue about reading the flash status register has yet to be
fixed.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

Signed-off-by: Theodor Stana <t.stana@cern.ch>

The flash-write tool is operational. The call to read status register
from flash-host is not working yet, and that is to be solved. In the
meantime, there are sleep functions inserted where we're supposed
to poll the status register.
Signed-off-by: Theodor Stana <t.stana@cern.ch>

wrc_main still in test-mode, currently doing a read of the first two
sectors (in the purpose of testing flash-write in tools -- see next
commit)

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

eeprom_present() returned a value nobody used. Rename to eeprom_init()
instead. Also, save the two parameters so that they are not needed
in other functions (see later commits).

Also, turn int8_t to int as function arguments (int is better for the
CPU).

This adds 20 bytes to the legacy case, and removes 4 to the sdb case.
The legacy size is reduced by later commits.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This allows stuff like

  ./MAKEALL spec_legacy_defconfig spec_sdb_defconfig

to choose your relevant configuration files alone.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This is the simpler thing: have vendor ID in the data structure.

We have 100 bytes more of data, but we save 50 bytes of code.  Total:
50 more but with simpler code (not bound to cern and gsi, thus
reusable).

Please maintainer choose and squash.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

[Note: this patch can be preserved or squashed into commit
  replace sdb.c with new library-based code
at the maintainer's best choice]

My initial code assumed the vendor is always VID_CERN, but this is
not true: some cells we use are VID_GSI.  This takes care of the thing.

To save a little space, instead of adding a 64-bit field to the data
structure describing a device, I add an integer field stating whether
the device is CERN or GSI.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This adds almost 800 bytes to all configurations, but removes
200 bytes from the gsi_defconfig.  This is because sdb-eeprom
is already managed with this library, and thus the commit is removing
a duplication.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

It is not mandatory to actually register the tree, but it's
a good move for consistency.

Later we'll need to scan several devices, for example to look for a
mac address in carrier flash or eeprom. To do that we'll need to have
devices properly registered.

This costs 150 bytes of binary size in gsi_defconfig.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

This makes the binary size 500 bytes bigger for gsi_defconfig
(the configuration already using the library) and strangely a little
smaller for etherbone_defconfig.
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>