linux.git/arch/mips/loongson2ef, branch master

MIPS: Loongson2ef: Use pcibios_align_resource() to block io range

2026-02-05T09:00:37+00:00

Loongson2ef reserves io range below 0x4000 (LOONGSON_PCI_IO_START) while
ISA-mode only IDE controller on the south bridge still has a hard
dependency on ISA IO ports.

The reservation was done by lifting loongson_pci_io_resource.start onto
0x4000. Prior to commit ae81aad5c2e1 ("MIPS: PCI: Use
pci_enable_resources()"), the arch specific pcibios_enable_resources()
did not check if the resources were claimed, which diverges from what
PCI core checks, effectively hiding the fact that IDE IO resources were
not properly within the resource tree. After starting to use
pcibios_enable_resources() from PCI core, enabling IDE controller fails:

  pata_cs5536 0000:00:0e.2: BAR 0 [io  0x01f0-0x01f7]: not claimed; can't enable device
  pata_cs5536 0000:00:0e.2: probe with driver pata_cs5536 failed with error -22

MIPS PCI code already has support for enforcing lower bounds using
PCIBIOS_MIN_IO in pcibios_align_resource() without altering the IO
window start address itself. Make Loongson2ef PCI code use
PCIBIOS_MIN_IO too.

Fixes: ae81aad5c2e1 ("MIPS: PCI: Use pci_enable_resources()")
Cc: stable@vger.kernel.org
Tested-by: Beiyan Yun 
Tested-by: Yao Zi 
Signed-off-by: Rong Zhang 
Acked-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson2ef: Register PCI controller in early stage

2026-02-05T09:00:37+00:00

We are about to set loongson_pci_io_resource.start to 0 and adopt
PCIBIOS_MIN_IO. As the first step, PCI controller needs to be registered
in early stage to make it the root of other resources (e.g., i8259) and
prevent resource conflicts.

Register it in plat_mem_setup() instead of arch_initcall().

Fixes: ae81aad5c2e1 ("MIPS: PCI: Use pci_enable_resources()")
Cc: stable@vger.kernel.org
Tested-by: Beiyan Yun 
Tested-by: Yao Zi 
Signed-off-by: Rong Zhang 
Acked-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson2ef: Replace deprecated strncpy() with strscpy()

2025-02-27T09:40:01+00:00

strncpy() is deprecated for NUL-terminated destination buffers. Use
strscpy() instead and remove the manual NUL-termination.

Compile-tested only.

Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Thorsten Blum 
Signed-off-by: Thomas Bogendoerfer

MIPS: Fix typos

2024-01-08T09:39:12+00:00

Fix typos, most reported by "codespell arch/mips".  Only touches comments,
no code changes.

Signed-off-by: Bjorn Helgaas 
Cc: linux-mips@vger.kernel.org
Reviewed-by: Randy Dunlap 
Signed-off-by: Thomas Bogendoerfer

MIPS: loongson2ef: Add missing break in cs5536_isa

2023-04-12T13:12:24+00:00

Fixes build error:

arch/mips/loongson2ef/common/cs5536/cs5536_isa.c:217:2: error:
unannotated fall-through between switch labels [-Werror,-Wimplicit-fallthrough]
        default:
        ^
arch/mips/loongson2ef/common/cs5536/cs5536_isa.c:217:2:
note: insert 'break;' to avoid fall-through
        default:
        ^
        break;

Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson: Don't select platform features with CPU

2023-04-05T07:45:09+00:00

ARCH_HAS_PHYS_TO_DMA and GPIOLIB are all platform level features
they shouldn't be selected with CPU.

Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson: Move arch cflags to MIPS top level Makefile

2023-04-05T07:45:09+00:00

Arch cflags should be independent to Platform.

Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: Prefer cc-option for additions to cflags

2023-01-26T03:41:29+00:00

A future change will switch as-option to use KBUILD_AFLAGS instead of
KBUILD_CFLAGS to allow clang to drop -Qunused-arguments, which may cause
issues if the flag being tested requires a flag previously added to
KBUILD_CFLAGS but not KBUILD_AFLAGS. Use cc-option for cflags additions
so that the flags are tested properly.

Signed-off-by: Nathan Chancellor 
Acked-by: Thomas Bogendoerfer 
Reviewed-by: Nick Desaulniers 
Reviewed-by: Philippe Mathieu-Daudé 
Tested-by: Linux Kernel Functional Testing 
Tested-by: Anders Roxell 
Signed-off-by: Masahiro Yamada

MIPS: Loongson2ef: remove orphan sbx00_acpi_init() declaration

2022-09-19T14:34:31+00:00

All uses of sbx00_acpi_init() in the "pci.c" file were removed by
commit 5831fdb099dd ("MIPS: Loongson2ef: clean up loongson64
related code"), so remove the orphan declaration, too.

Signed-off-by: Gaosheng Cui 
Signed-off-by: Thomas Bogendoerfer

MIPS: Loongson{2ef,64}: Wrap -mno-branch-likely with cc-option

2022-02-07T17:30:12+00:00

This flag is not supported by clang, which results in a warning:

  clang-14: warning: argument unused during compilation: '-mno-branch-likely' [-Wunused-command-line-argument]

This breaks cc-option, which adds -Werror to make this warning fatal and
catch flags that are not supported.

Wrap this flag in cc-option so that it does not cause cc-option to fail,
which can cause randconfigs to be really noisy, due to warnings not
getting disabled that should be.

Additionally, move the cc-option check to Kconfig so that the check is
done at configuration time, rather than build time, as builds with no
configuration change will be quicker because the cc-option call will not
need to happen in those instances.

Suggested-by: Nick Desaulniers 
Signed-off-by: Nathan Chancellor 
Signed-off-by: Thomas Bogendoerfer