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authorPalmer Dabbelt <palmer@rivosinc.com>2023-09-08 11:24:34 -0700
committerPalmer Dabbelt <palmer@rivosinc.com>2023-09-08 11:24:34 -0700
commitc23be918c5d0f860971cf824de772714b4c771ea (patch)
tree2394f1d44e748da1eede675c26d948bef54feb06 /MAINTAINERS
parent7f215d003f31d56b458c7c3c8c7185a1697f5076 (diff)
parent484861e09f3ed8fb2e1de290d9e33fee3611b9fc (diff)
Merge patch series "Add non-coherent DMA support for AX45MP"
Prabhakar <prabhakar.csengg@gmail.com> says: From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> non-coherent DMA support for AX45MP ==================================== On the Andes AX45MP core, cache coherency is a specification option so it may not be supported. In this case DMA will fail. To get around with this issue this patch series does the below: 1] Andes alternative ports is implemented as errata which checks if the IOCP is missing and only then applies to CMO errata. One vendor specific SBI EXT (ANDES_SBI_EXT_IOCP_SW_WORKAROUND) is implemented as part of errata. Below are the configs which Andes port provides (and are selected by RZ/Five): - ERRATA_ANDES - ERRATA_ANDES_CMO OpenSBI patch supporting ANDES_SBI_EXT_IOCP_SW_WORKAROUND SBI is now part v1.3 release. 2] Andes AX45MP core has a Programmable Physical Memory Attributes (PMA) block that allows dynamic adjustment of memory attributes in the runtime. It contains a configurable amount of PMA entries implemented as CSR registers to control the attributes of memory locations in interest. OpenSBI configures the PMA regions as required and creates a reserve memory node and propagates it to the higher boot stack. Currently OpenSBI (upstream) configures the required PMA region and passes this a shared DMA pool to Linux. reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; pma_resv0@58000000 { compatible = "shared-dma-pool"; reg = <0x0 0x58000000 0x0 0x08000000>; no-map; linux,dma-default; }; }; The above shared DMA pool gets appended to Linux DTB so the DMA memory requests go through this region. 3] We provide callbacks to synchronize specific content between memory and cache. 4] RZ/Five SoC selects the below configs - AX45MP_L2_CACHE - DMA_GLOBAL_POOL - ERRATA_ANDES - ERRATA_ANDES_CMO ----------x---------------------x--------------------x---------------x---- * b4-shazam-merge: soc: renesas: Kconfig: Select the required configs for RZ/Five SoC cache: Add L2 cache management for Andes AX45MP RISC-V core dt-bindings: cache: andestech,ax45mp-cache: Add DT binding documentation for L2 cache controller riscv: mm: dma-noncoherent: nonstandard cache operations support riscv: errata: Add Andes alternative ports riscv: asm: vendorid_list: Add Andes Technology to the vendors list Link: https://lore.kernel.org/r/20230818135723.80612-1-prabhakar.mahadev-lad.rj@bp.renesas.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'MAINTAINERS')
-rw-r--r--MAINTAINERS7
1 files changed, 7 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS
index 4e3419c04f27..6e7118fb2818 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20340,6 +20340,13 @@ S: Supported
T: git git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
F: drivers/staging/
+STANDALONE CACHE CONTROLLER DRIVERS
+M: Conor Dooley <conor@kernel.org>
+L: linux-riscv@lists.infradead.org
+S: Maintained
+T: git https://git.kernel.org/pub/scm/linux/kernel/git/conor/linux.git/
+F: drivers/cache
+
STARFIRE/DURALAN NETWORK DRIVER
M: Ion Badulescu <ionut@badula.org>
S: Odd Fixes