Commit graph

8 commits

Author SHA1 Message Date
Wolfgang Denk
d1a24f0618 Minor Coding Style Cleanup.
Signed-off-by: Wolfgang Denk <wd@denx.de>
2011-02-02 22:36:10 +01:00
Kumar Gala
dd50af2515 powerpc/8xxx: Add hwconfig APIs to address early parsing used by DDR init
There are several users of the hwconfig APIs (8xxx DDR) before we have
the environment properly setup.  This causes issues because of the
numerous ways the environment might be accessed because of the
non-volatile memory it might be stored in.  Additionally the access
might be so early that memory isn't even properly setup for us.

Towards resolving these issues we provide versions of all the hwconfig
APIs that can be passed in a buffer to parse and leave it to the caller
to determine how to allocate and populate the buffer.

We use the _f naming convention for these new APIs even though they are
perfectly useable after relocation and the environment being ready.

We also now warn if the non-f APIs are called before the environment is
ready to allow users to address the issues.

Finally, we convert the 8xxx DDR code to utilize the new APIs to
hopefully address the issue once and for all.  We have the 8xxx DDR code
create a buffer on the stack and populate it via getenv_f().

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Wolfgang Denk <wd@denx.de>
2011-01-19 22:58:23 -06:00
Kumar Gala
bb141079d3 hwconfig: Fix handling of env_hwconfig, board_hwconfig, and cpu_hwconfig
The handling of env_hwconfig, board_hwconfig, and cpu_hwconfig got
broken when we removed the boards defining dummy board_hwconfig
& cpu_hwconfig values.

We fix this by handling the various strings in priority order.  If
hwconfig_parse returns NULL for a given string we check the next one
in order (env_hwconfig, board_hwconfig, followed by cpu_hwconfig).

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2010-12-09 11:01:13 +01:00
Kumar Gala
b194577b29 hwconfig: Fix dummy initialization of {board, cpu}_hwconfig
Since board_hwconfig & cpu_hwconfig are defined as weak and dont have a
default value they will get put into the BSS if they aren't defined
elsewhere.  This is problematic as we try to utilize hwconfig before
we've relocated and thus BSS isn't setup.

Instead of giving dummy values in the board files that utilize this
feature, we can just initialize the variables to an empty string and
thus move them out of the BSS if they aren't defined elsewhere.

Also made board_hwconfig & cpu_hwconfig arrays to reduce size associated
with string pointers vs arrays.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2010-11-30 22:11:19 +01:00
Kumar Gala
c4b115f536 hwconfig: Utilize getenv_f before relocation to allow for larger buffer
Since we use hwconfig in cases before relocation (like getting DDR
params on FSL PPC systems), we can have strings that exceed the early
small (32 byte) buffer size that getenv will handle.

So we explicitly allocate our own buffer on the stack and use if to
handle getting the hwconfig env string.  We currently utilize a string
length of 128 bytes.

This allows us to get rid of boot messages like:

env_buf too small [32]

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2010-10-23 22:10:54 +02:00
Anton Vorontsov
3bf74a4183 hwconfig: Add some unit tests
I use this for testing, and I think this might be useful in the
future.

Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
2010-06-29 22:24:48 +02:00
Anton Vorontsov
81f8d3b021 hwconfig: Fix stop characters parsing for subkeys
For the following hwconfig string:

  key1:subkey1=value1,subkey2=value2;key2:value3

The subkey2 cannot be extracted correctly. The parsing code looks
for comma as a stopch, but there may be two kind of stop characters:
a comma and a semicolon.

Currently the code would return "value2;key2:value3", while just
"value2" is the correct answer.

This patch fixes the issue by making the code aware of multiple
stop characters.

For old U-Boots, the issue can be workarounded by placing a comma
before a semicolon, i.e.:

  hwconfig=key1:subkey1=value1,subkey2=value2,;key2:value3

Reported-by: York Sun <yorksun@freescale.com>
Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
2010-06-29 22:24:11 +02:00
Anton Vorontsov
93f9dcf9e8 Add simple hwconfig infrastructure
This patch implements simple hwconfig infrastructure: an
interface for software knobs to control a hardware.

This is very simple implementation, i.e. it is implemented
via `hwconfig' environment variable. Later we could write
some "hwconfig <enable|disable|list>" commands, ncurses
interface for Award BIOS-like interface, and frame-buffer
interface for AMI GUI[1] BIOS-like interface with mouse
support[2].

Current implementation details/limitations:

1. Doesn't support options dependencies and mutual exclusion.
   We can implement this by integrating apt-get[3] into the
   u-boot. But I didn't bother yet.

2. Since we don't implement hwconfig command, i.e. we're working
   with the environement directly, there is no way to tell that
   toggling a particular option will need a reboot to take
   an effect. So, for now it's advised to always reboot the
   target after modifying hwconfig variable.

3. We support hwconfig options with arguments. For example,

   set hwconfig dr_usb:mode=peripheral,phy_type=ulpi

   That means:
   - dr_usb - enable Dual-Role USB controller;
   - dr_usb:mode=peripheral - USB in Function mode;
   - dr_usb:phy_type=ulpi - USB should work with ULPI PHYs;

The purpose of this simple implementation is to define some
internal API and then we can continue improving user experience
by adding more mature interface, like hwconfig command with
bells and whistles. Or not adding, if we feel that current
interface fits its needs.

[1] http://en.wikipedia.org/wiki/American_Megatrends
[2] Regarding ncurses and GUI with mouse support -- I'm just
    kidding.
[3] The comment regarding apt-get is also a joke, meaning that
    dependency tracking could be non-trivial. For example, for
    enabling HW feature X we may need to disable Y, and turn Z
    into reduced mode (like RMII-only interface for ethernet,
    no MII).

    It's quite trivial to implement simple cases though.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
2009-07-16 22:23:53 +02:00