[PATCH 0/8] MIPS: Unify low-level debugging functionalities

[Jiaxun Yang]

Hi all,

This is a attempt to bring all low-level debugging print functions
together and provide a arm-like low-level debugging interface and
a further function to debug early exceptions.

The plan is to elimiate platform specific early_printk and
cps-vec-ns16550 by debug_ll and earlycon.

cps-vec-ns16550 is leave unchanged for now due to pending patch[1].

Hope you'll find them handy :-)

Happy hacking!

Thanks
Jiaxun

[1]: https://lore.kernel.org/linux-mips/20231027221106.405666-6-jiaxun.yang@xxxxxxxxxxx/

Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>
---
Jiaxun Yang (8):
      MIPS: asm: Move strings to .rodata.str section
      MIPS: debug: Implement low-level debugging functions
      MIPS: debug: Hook up DEBUG_LL with early printk
      MIPS: debug: Provide an early exception vector for low-level debugging
      MIPS: debug_ll: Add Kconfig symbols for some 8250 uarts
      MIPS: debug_ll: Implement support for Alchemy uarts
      MIPS: debug_ll: Implement support for AR933X uarts
      MIPS: zboot: Convert to use debug_ll facilities

 arch/mips/Kconfig                        |  12 +-
 arch/mips/Kconfig.debug                  | 212 +++++++++++++++++++++++++++----
 arch/mips/boot/compressed/Makefile       |   9 +-
 arch/mips/boot/compressed/dbg.c          |  37 ------
 arch/mips/boot/compressed/debug-vec.S    |   3 +
 arch/mips/boot/compressed/debug.S        |   3 +
 arch/mips/boot/compressed/decompress.c   |   6 +-
 arch/mips/boot/compressed/head.S         |   6 +
 arch/mips/boot/compressed/uart-16550.c   |  47 -------
 arch/mips/boot/compressed/uart-alchemy.c |   7 -
 arch/mips/boot/compressed/uart-ath79.c   |   2 -
 arch/mips/boot/compressed/uart-prom.c    |   7 -
 arch/mips/include/asm/asm.h              |   2 +-
 arch/mips/include/debug/8250.S           |  60 +++++++++
 arch/mips/include/debug/alchemy.S        |  46 +++++++
 arch/mips/include/debug/ar933x.S         |  41 ++++++
 arch/mips/include/debug/uhi.S            |  48 +++++++
 arch/mips/kernel/Makefile                |   3 +
 arch/mips/kernel/debug-vec.S             | 194 ++++++++++++++++++++++++++++
 arch/mips/kernel/debug.S                 | 130 +++++++++++++++++++
 arch/mips/kernel/early_printk.c          |  19 +++
 arch/mips/kernel/head.S                  |   4 +
 22 files changed, 750 insertions(+), 148 deletions(-)
---
base-commit: 66f1e1ea3548378ff6387b1ce0b40955d54e86aa
change-id: 20231028-mips_debug_ll-ef9cce16767b

Best regards,
-- 
Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>