cmd_pxe.c add any option for filesystem with sysboot uses generic load

Signed-off-by: Dennis Gilmore <dennis@ausil.us>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
config: add config_distro_defaults.h

describe a set of default features that distros can rely on being available.
having this common definition means that distros can easily support systems
implementing them.

Signed-off-by: Dennis Gilmore <dennis@ausil.us>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
pxe: implement fdtdir extlinux.conf tag

People who write (or scripts that auto-generate) extlinux.conf don't
want to know about HW-specific information such as FDT filenames. Create
a new extlinux.conf tag "fdtdir" that specifies only the directory where
FDT files are located, and defer all knowledge of the filename to U-Boot.
The algorithm implemented is:

==========
if $fdt_addr_r is set:
  if "fdt" tag was specified in extlinux.conf:
    load the FDT from the filename in the tag
  else if "fdtdir" tag was specified in extlinux.conf:
    if "fdtfile" is set in the environment:
      load the FDT from filename in "$fdtfile"
    else:
      load the FDT from some automatically generated filename

if no FDT file was loaded, and $fdtaddr is set:
  # This indicates an FDT packaged with firmware
  use the FDT at $fdtaddr
==========

A small part of an example /boot/extlinux.conf might be:

==========
LABEL primary
        LINUX zImage
        FDTDIR ./

LABEL failsafe
        LINUX bkp/zImage
        FDTDIR bkp/
==========

... with /boot/tegra20-seaboard.dtb or /boot/bkp/tegra20-seaboard.dtb
being loaded by the sysboot/pxe code.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v1 (relative to RFC): no change; just reposting as non-RFC

This patch depends on the following from Dennis Gilmore:
- cmd_pxe.c add any option for filesystem with sysboot uses generic load
- config: add config_distro_defaults.h
fs: fix generic save command implementation

Fix a few issues with the generic "save" shell command, and fs_write()
function.

1) fstypes[].write wasn't filled in for some file-systems, and isn't
   checked when used, which could cause crashes/... if executing save
   on e.g. fat/ext filesystems.

2) fs_write() requires the length argument to be non-zero, since it needs
   to know exactly how many bytes to write. Adjust the comments and code
   according to this.

3) fs_write() wasn't prototyped in <fs.h> like other generic functions;
   other code should be able to call this directly rather than invoking
   the "save" shell command.

Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
fs: implement infra-structure for an 'exists' function

This could be used in scripts such as:

if exists mmc 0:1 /boot/boot.scr; then
    load mmc 0:1 ${scriptaddr} /boot/boot.scr
    source ${scriptaddr}
fi

rather than:

if load mmc 0:1 ${scriptaddr} /boot/boot.scr; then
    source ${scriptaddr}
fi

This prevents errors being printed by attempts to load non-existent
files, which can be important when checking for a large set of files,
such as /boot/boot.scr.uimg, /boot/boot.scr, /boot/extlinux.conf,
/boot.scr.uimg, /boot.scr, /extlinux.conf.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
sandbox: implement fs_exists() and 'sb exists' shell function

This hooks into the generic "file exists" support added in the previous
patch, and provides an implementation for the sandbox test environment.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
ext4: implement exists() for ext4fs

This hooks into the generic "file exists" support added in an earlier
patch, and provides an implementation for the ext4 filesystem.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
fat: implement exists() for FAT fs

This hooks into the generic "file exists" support added in an earlier
patch, and provides an implementation for the ext4 filesystem.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: s/ext/fat/ in the commit subject
ARM: tegra: set env vars to indicate Cardhu A04 support

The U-Boot "cardhu" build supports only revision 4 of the Cardhu board
and later compatible revisions. Hence, set $board_name in the default
environment to "cardhu-a04" rather than just "cardhu".

The Linux kernel has separate DTs for Cardhu A02 and A04, although the
former isn't really supported any more. Consequently, the kernel DT file
that matches the U-Boot cardhu build is "tegra30-cardhu-a04.dtb" rather
than "tegra30-cardhu.dtb". Set the $fdtfile default environment variable
to reflect this.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: New patch.

Note that this series depends on the following, which are not yet
applied:

(dgilmore) cmd_pxe.c add any option for filesystem with sysboot uses generic load
(dgilmore) config: add config_distro_defaults.h
(swarren) pxe: implement fdtdir extlinux.conf tag
(swarren) fs: fix generic save command implementation
(swarren) fs: implement infra-structure for an 'exists' function
(swarren) sandbox: implement fs_exists() and 'sb exists' shell function
(swarren) ext4: implement exists() for ext4fs
(swarren) fat: implement exists() for FAT fs
ARM: tegra: convert tegra to use distro defaults

Modify all Tegra boards to include the "distro defaults" header, so that
all the config options distros expect are enabled. Remove any #defines
that enable the same options from the Tegra files.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: No change
ARM: tegra: rework boot scripts

Update the common Tegra boot scripts in the default environment to

a) Make use of the new "exists" shell command to avoid some error
   messges.

b) Allow booting using the sysboot command and extlinux.conf. This
   allows easy creation of boot menus, and provides a simple interface
   for distros to parameterize/configure the boot process.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: No change
ARM: tegra: implement bootcmd_pxe

This retrieves a PXE config file over the network, and executes it. This
allows an extlinux config file  to be retrieved over the network and
executed, whereas the existing bootcmd_dhcp retrieves a U-Boot script.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: No change
ARM: tegra: clear $usb_need_init each boot

$usb_need_init prevents "usb start" from being run multiple times for
each boot attempt, i.e. once for USB storage, another for PXE, and
another for DHCP. However, the flag that's used to determine when to run
"usb start" is never cleared, so a subsequent "boot" command will never
probe for a freshly plugged in USB device. Fix this so that new USB
devices will be probed once per boot attempt.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2: New patch
LATER: ARM: tegra: add support for more clocks on Tegra114

FIXME: work on this later after Tegra124 support.
FIXME: re-write commit description now it's been split up...

Some Tegra114 peripherals can take up to 8 different clock sources
(parents), including 4 new ones that don't exist on previous chips
(PLLC2/C3/MEM2/SRC2). Expand clock/PLL code/tables to support these
additional bits/sources.

Changes were made to some common code. Testing on Tegra30 and Tegra20
showed no changes in periph clock sources/divisors.

Also, peripheral clock sources that no longer exist on Tegra114 were
removed from the clock_periph_type table (CVE, TVDAC, etc.), and periphs
that are gone or not needed in early init are no longer brought out of
reset/enabled (FUSE, IRAMA/B/C/D, etc.).

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v3:
* Undid change to assert on divisor value; the fix was applied to the
  wrong assert. The assert which should have been fixed was within the
  removed unused code.
v2:
- Fixed an assert test for a divisor value (s/b >0, not >=0)
- Remove some unused code
Revert "LATER: ARM: tegra: add support for more clocks on Tegra114"

This reverts commit 6cf0329f447d51e1ad5909d46f79cfd4756a4c93.
LATER: ARM: tegra: dalmore: add PMIC init for various peripherals

FIXME: work on this later after Tegra124 support.

These power rails are currently needed for kernel boot. This will be move
to a PMIC-specific driver (or even better moved to the kernel) at a later
date.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
Revert "LATER: ARM: tegra: dalmore: add PMIC init for various peripherals"

This reverts commit 2e5b746676e5360325456184750e979726b4a009.
ARM: tegra: add/edit headers for Tegra124

These headers define the Tegra124 hardware. Add them to the usual
place.

Add Tegra124 chip ID/SKU ID definitions to common headers.

There's no real HW change on Tegra124 for 90% of the toys, so it might
make sense for a future patch to unify some of the content of these
files in a common location.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2:
* Put content directly into files in arch-tegra124/; don't put files there
  that simply include the real files in arch-tegra/.
* Removed unused emc.h, fuse.h.
* Added to arch-tegra/pmc.h rather than creating a new arch-tegra124/pmc.h,
  since some code already includes arch-tegra/pmc.h, and I didn't feel good
  about different code getting different versions of pmc.h.
* Remove error-inducing prototype for board_usb_init().
* Squashed in the other patch which edited arch-tegra/*.h, since they're
  both just adding/editing header files.
* Don't touch Tegra114 SPI header.
* Minor whitespace cleanup.
ARM: tegra: add SPL/AVP (arm720t) CPU files for Tegra124

This provides SPL support for Tegra124 boards - AVP early init, plus
CPU (A15) init/jump to main U-Boot.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2:
* Convert to Kconfig-style make Makefiles.
* Update AVP/PLLP clock programming to match Tegra114.
* don't mangle (c) header in cpu.c.
* Remove leading space from debug() messages.
* Fix comment re: CPUPWRGOOD_TIMER
ARM: tegra: Add CPU (armv7) files for Tegra124

These files are for code that runs on the CPU (A15) on Tegra124 boards.
At this time, there is no A15-specific code here. The warmboot/LP0 files
aren't included as that code hasn't been ported yet.

Signed-off-by: Tom Warren <twarren@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
---
v2:
* Convert to Kconfig-style make Makefiles
* s/MASK_BITS_29_28/MASK_BITS_31_28/ to match earlier renaming patch
* Update AVP/PLLP clock programming to match Tegra114