linux-toradex.git/arch/powerpc/kernel/udbg.c, branch v6.16

powerpc: Remove UDBG_RTAS_CONSOLE

2025-02-26T15:45:09+00:00

The IBM Cell blade support was the last user of UDBG_RTAS_CONSOLE.

Although it's still possible to build it via
PPC_EARLY_DEBUG_UDBG_RTAS_CONSOLE, AFAIK it's not useful on any
other platfoms, because only Cell and JS20 era machines provided the
RTAS get/put-term-char functions.

If anyone is using it or needs it we can always resurrect it from git.

Signed-off-by: Michael Ellerman 
Signed-off-by: Madhavan Srinivasan 
Link: https://patch.msgid.link/20241218105523.416573-19-mpe@ellerman.id.au

powerpc/64: Remove maple platform

2024-10-29T12:01:52+00:00

The maple platform was added in 2004 [1], to support the "Maple" 970FX
evaluation board.

It was later used for IBM JS20/JS21 machines, as well as the Bimini
machine, aka "Yellow Dog Powerstation".

Sadly all those machines have passed into memory, and there's been no
evidence for years that anyone is still using any of them.

Remove the platform and related code. It can always be reinstated if
there's interest.

Note that this has no impact on support for 970FX based Power Macs.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux-fullhistory.git/commit/?id=f0d068d65c5e555ffcfbc189de32598f6f00770c

Signed-off-by: Michael Ellerman 
Link: https://patch.msgid.link/20241013102957.548291-1-mpe@ellerman.id.au

powerpc: Remove core support for 40x

2024-06-28T12:28:47+00:00

Now that 40x platforms have gone, remove support
for 40x in the core of powerpc arch.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240628121201.130802-4-mpe@ellerman.id.au

powerpc: Add support for early debugging via Serial 16550 console

2022-09-28T09:22:09+00:00

Currently powerpc early debugging contains lot of platform specific
options, but does not support standard UART / serial 16550 console.

Later legacy_serial.c code supports registering UART as early debug console
from device tree but it is not early during booting, but rather later after
machine description code finishes.

So for real early debugging via UART is current code unsuitable.

Add support for new early debugging option CONFIG_PPC_EARLY_DEBUG_16550
which enable Serial 16550 console on address defined by new option
CONFIG_PPC_EARLY_DEBUG_16550_PHYSADDR and by stride by option
CONFIG_PPC_EARLY_DEBUG_16550_STRIDE.

With this change it is possible to debug powerpc machine descriptor code.
For example this early debugging code can print on serial console also
"No suitable machine description found" error which is done before
legacy_serial.c code.

Signed-off-by: Pali Rohár 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220822231501.16827-1-pali@kernel.org

isystem: ship and use stdarg.h

2021-08-19T00:02:55+00:00

Ship minimal stdarg.h (1 type, 4 macros) as .
stdarg.h is the only userspace header commonly used in the kernel.

GPL 2 version of  can be extracted from
http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz

Signed-off-by: Alexey Dobriyan 
Acked-by: Rafael J. Wysocki 
Acked-by: Ard Biesheuvel 
Signed-off-by: Masahiro Yamada

powerpc/udbg: Make it safe to call udbg_printf() always

2019-10-11T08:33:25+00:00

Make udbg_printf() check if udbg_putc is set, and if not just return.
This makes it safe to call udbg_printf() anytime, even when a udbg
backend has not been registered, which means we can avoid some ifdefs
at call sites.

Signed-off-by: Qian Cai 
[mpe: Split out of larger patch, write change log]
Signed-off-by: Michael Ellerman

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

2019-05-30T18:26:32+00:00

Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Allison Randal 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman

powerpc: use a CONSOLE_LOGLEVEL_DEBUG macro

2019-01-14T09:39:27+00:00

Use a CONSOLE_LOGLEVEL_DEBUG macro for console_loglevel rather
than a naked number.

Signed-off-by: Sergey Senozhatsky 
Signed-off-by: Michael Ellerman

powerpc: Remove the celleb support

2015-04-07T07:15:13+00:00

The celleb code has seen no actual development for ~7 years.

We (maintainers) have no access to test hardware, and it is highly
likely the code has bit-rotted.

As far as we're aware the hardware was never widely available, and is
certainly no longer available, and no one on the list has shown any
interest in it over the years.

So remove it. If anyone has one and cares please speak up.

Signed-off-by: Michael Ellerman 
Acked-by: Benjamin Herrenschmidt 
Acked-by: Jeremy Kerr

powerpc: Remove platforms/wsp and associated pieces

2014-06-11T06:35:38+00:00

__attribute__ ((unused))

WSP is the last user of CONFIG_PPC_A2, so we remove that as well.

Although CONFIG_PPC_ICSWX still exists, it's no longer selectable for
any Book3E platform, so we can remove the code in mmu-book3e.h that
depended on it.

Signed-off-by: Michael Ellerman 
Signed-off-by: Benjamin Herrenschmidt