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This also obsoletes fel-copy.c - for details see issue #78.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

The functions represent ARM "thunk" code that can be invoked via
FEL to execute arbitrary memory copy operations on the target
device, i.e. they deal with overlap and unaligned access. Where
possible, the copy operation will use (32-bit) word transfers,
otherwise it falls back to bytewise copying.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

SID fix / H3 workaround

Also includes an updated uart0-helloworld-sdboot.sunxi binary.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

With fixed SID reading routine, it's now possible to differ H2+ with H3
with SID.

Tested on an Orange Pi One and an Orange Pi Zero.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

The patch also introduces a "sid-register" command for diagnostic
purposes. It allows to use/enforce the workaround method for other
SoCs, to check if there are any inconsistencies with the values
read from memory.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

The new function fel_get_sid_registers() uses ARM code for register
access to the SID root key. This is necessary to retrieve correct
values for certain SoCs, e.g. when not using this approach the H3
has been observed to return 'mangled' values (when reading SID from
memory).

See https://groups.google.com/forum/#!topic/linux-sunxi/ynyIP8c61Qs



The FEL library provides a uniform fel_get_sid_root_key() wrapper
that will automatically use the workaround method for SoCs that
are tagged accordingly - so the application program does not have
to bother with selecting memory vs. register-based access.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

H3 SID controller has some bug, that makes the initial value at
0x01c14200 wrong.

This commit workarounds this bug by reading them with register access
first.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Reviewed-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This is a preparatory step. Instead of using memory-based access,
we might want to retrieve SID keys (e-fuses) via SID registers.
For this, it's convenient if the plain base address is available.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Add support for Allwinner V3s, which is similar to A10/A13/A20 in terms of SRAM mapping and SID address.

Add the SoC ID and UART0 pinmux for V3s.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

The V3s SoC looks like A10/13/20 in SRAM mapping and SID address.

Add support for it.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

fel: Improve on handling invalid options

This is to make sure that users get notified accordingly if the
"sunxi-fel --list" doesn't find any FEL devices.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

For unknown option-style arguments (starting with '-'), exit after
printing an error message.

This avoids situations where sunxi-fel would not report incorrect
options (with no FEL device attached/detected) and fail with
"Allwinner USB FEL device not found" instead, which is undesirable.

TODO: Might have to eventually migrate this to some better argument
parsing, e.g. getopt(3) or something similar.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

fel:
- Minor review of ARM scratch code
- POSIX conformance: Use nanosleep() instead of deprecated usleep()

README:
- revert Unicode dash to standard ASCII
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Make use of FEL library to implement device enumeration and selection by SID

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

"./sunxi-fel --list" enumerates Allwinner USB devices that
are in FEL mode. For each device detected, the SoC name/ID
and - if available - the SID key will be printed to stdout.
The utility then exits with status code 0 (upon success),
or 1 if no devices were found.

The current implementation treats the list feature as an option,
to be able to handle it *before* the first attempt to call
feldev_open() - which could fail (with no FEL devices connected).
However, a "list" alias is available for users who expect this
to be 'command' syntax, so "./sunxi-fel list" works too.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

open_fel_device() will automatically provide this member field,
based on the SoC ID from FEL/BROM version data. The field will
either receive a human-readable identifier, or the ID in 4-digit
hexadecimal representation (for unknown SoCs).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

The feldev_handle struct returned by feldev_open() will now contain
this additional data, so the main application no longer needs to care
about retrieving that.

aw_fel_get_version() has thus become a static (= 'private') function.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

The FEL utility had accumulated enough (mostly USB-related)
"low-level" code to justify moving that to a separate code unit.
This will allow us to keep better focus on the higher level
functionality in fel.c.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This moves claiming / releasing the interface into the respective
"open" / "close" functions. The USB code in main() is now trimmed
down to:

feldev_init();
handle = open_fel_device(...);
feldev_done(handle);
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

We move USB endpoint detection into the feldev_claim() routine, so
higher level code is no longer involved with that. Also make use of
the "detached" flag within feldev_handle, instead of relying on an
isolated variable.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

This enables us to move forward to a cleaner implementation,
where the "core" fel.c code will become independent of direct
libusb usage. After moving USB code to a separate module,
in the end the libusb handle could become an 'opaque' field of
feldev_handle.

The "device" handle might also be extended later, to provide
(FEL) version data and SoC-specific information (chip ID, SRAM
info, human-readable name).
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

See pull requests #59 and #83.

It looks like various BSD derivates have adopted the more common naming
conventions for the endian conversion macros, which means that we would
attempt to redefine them without need (potentially even to 'historic'
names that no longer exist).

Try to avoid this by properly checking for existing functions first.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

The SID block in the A80 is at 0x01c0e000, with the e-fuses we care
about at offset 0x200 within the block.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

R40 support for fel and uart0-helloworld

The R40 is the same as the A20 for all intents and purposes of
uart0-helloworld.

Add R40's SOC ID.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

The R40 is marketed as the successor to the A20. The SRAM layout is the
same as the A20, but there doesn't seem to be a secure SRAM block.

The SID block is at a completely different address. The layout is the
same as the newer SoCs, with the e-fuses at an offset of 0x200.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>

These functions solve the problem that large readl/writel
transfers might be limited by insufficient (scratch) buffer
size. To solve this, chunks of no more than LCODE_MAX_WORDS
get transferred individually.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>