u-boot.git/arch/powerpc, branch v2025.07

Merge tag 'mmu-next-14032025' of https://source.denx.de/u-boot/custodians/u-boot-tpm into next

2025-03-14T15:31:36Z

Up to now we configure the entire memory space for U-Boot as RWX. For modern architectures and security requirements, it's better to map the memory properly. This pull request adds basics support for mapping the U-Boot binary with proper (RO, RW, RW^X) memory permissions on aarch64 right after we relocate U-Boot in the top of DRAM. It's worrth noting that the linker script annotations are only added for the aarch64 architecture. We can, in the future, try to unify the linker -- at least for the architectures that have enough in common and expand this

treewide: Add a function to change page permissions

2025-03-14T11:37:54Z

For armv8 we are adding proper page permissions for the relocated U-Boot binary. Add a weak function that can be used across architectures to change the page permissions Tested-by: Neil Armstrong # on AML-S905X-CC Signed-off-by: Ilias Apalodimas

mmc: fsl_esdhc: Migrate ESDHCI_QUIRK_BROKEN_TIMEOUT_VALUE to Kconfig

2025-03-13T18:15:50Z

The flag for enabling the ESDHCI_QUIRK_BROKEN_TIMEOUT_VALUE quirk can be handled easily enough in Kconfig. This lets us remove a function but not obviously correct usage of the IS_ENABLED() macro. Signed-off-by: Tom Rini Reviewed-by: Peng Fan

Merge patch series "Misc. PowerPC MPC83xx fixes/cleanups"

2024-12-30T21:55:33Z

J. Neuschäfer says: This patchset contains a few small fixes/cleanups for the MPC83xx platform. Link: https://lore.kernel.org/r/20241220-mpc83xx-misc-v2-0-ff4c17ee5fa4@posteo.net

powerpc: mpc83xx: Use defined constant for SPCR[TBEN]

2024-12-30T21:55:27Z

To increase readability, use the defined constant instead of specifying SPCR[TBEN] as a number. Reviewed-by: Sinan Akman Signed-off-by: J. Neuschäfer

powerpc: mpc83xx: Allow including initreg.h into multiple files

2024-12-30T21:55:27Z

Globals defined in headers can result in multiple-definition errors while linking, if they are visible beyond the current translation unit. This hasn't been a problem for initreg.h so far, but would become a problem in the next patch, where I use a constant from initreg.h in a second C file. Reviewed-by: Sinan Akman Signed-off-by: J. Neuschäfer

Merge patch series "powerpc: Fix and enforce distinction between immediates and registers"

2024-12-30T21:55:11Z

J. Neuschäfer says: This patchset changes the definition r0 etc. to %r0, so that the assembler can check that registers are only used where expected, and fixes the fallout. Link: https://lore.kernel.org/r/20241212-gpr-checks-v1-0-8c084c5fc0b6@posteo.net

powerpc: Introduce and enforce assembler checks on GPR usage

2024-12-30T21:55:07Z

PowerPC general-purpose registers are historically specified as plain numbers (0-31), which makes them hard to distinguish from immediates. For this reason, include/ppc_asm.tmpl defines aliases named r0-r31. This can still lead to uncaught mistakes if a register is used in place of a number. Instead of (e.g.) 5 use %r5, which will result in an assembler warning if used as a number. Turn these warnings into errors by passing `--fatal-warnings` to the assembler. I verified with gazerbeam_defconfig (MPC83xx) and qemu-ppce500_defconfig (MPC85xx) that this patch results in the same machine code. Signed-off-by: J. Neuschäfer

powerpc: Fix 0 vs. r0 confusion in X/D-form instructions

2024-12-30T21:55:07Z

Instructions such as dcbi are in the X-form; they have RA and RB fields and the effective address (EA) is computed as (RA|0)+(RB). In words, this means that if RA is zero, the left-hand side of the addition is zero, otherwise the corresponding GPR is used. r0 can never be used on the left-hand side of a X-form instruction. For D-form instructions such as addis, the Power ISA illustrates this in the instruction pseudo-code: if RA = 0 then RT <- EXTS(SI || 0x0000) else RT <- (RA) + EXIS(SI || 0x0000) In all of these cases, RA=0 indicates the value zero, not register r0. I verified with gazerbeam_defconfig (MPC83xx) and qemu-ppce500_defconfig (MPC85xx) that this patch results in the same machine code. Signed-off-by: J. Neuschäfer

lmb: Remove lmb_reserve_flags()

2024-12-30T19:21:55Z

lmb_reserve() is just calling lmb_reserve_flags() with LMB_NONE. There's not much we gain from this abstraction. So let's remove the latter, add the flags argument to lmb_reserve() and make the code a bit easier to follow. Reviewed-by: Tom Rini Reviewed-by: Sam Protsenko Tested-by: Sam Protsenko Signed-off-by: Ilias Apalodimas