Initial platform support for ESWIN Computing EIC7700 based on public SoC
datasheet[1] and tested on HiFive Premier P550. Vendor U-boot/Linux boots
fine, and I've tested Geekbench 6.5.0 Preview and got scores on par with
the vendor OpenSBI. System shutdown/reboot for HiFive Premier P550 and
other boards will be implemented in subsequent commits. At this point,
only SoC-level warm reset is implemented.
The files and functions are intentionally named as eic770x in many places
for future enhancements to support the 2 die version of the same SoC,
namely EIC7702, seen on DC-ROMA AI PC FML13V03 [2]. This patch set only
deals with the single die version, and the assumption is we can be either
die with id=0 or id=1, but there's only a single die in the system, or we
are only using a single die out of 2. However, the way the SoC handles 2-
die greatly affects how we configure it in a 1-die setup. EIC770X address
map has die 0/1 memory regions interleaved (see comments in eic770x.c).
If only 1 die is connected or active, it creates holes in the address map
for those regions corresponding to the remote die. When speculative-
execution or HW prefetcher touches data-cacheable regions that happen to
fall into those holes, it can trigger bus error. Specifically:
- Remote (non-existent) die L3 zero device
- Remote (non-existent) die cached memory region
- Other holes in Memory Port
To make matters worse, EIC770X doesn't have cache coherent DMA, and due
to the fact that the P550 core lacks Svpbmt, the SoC maps main memory
twice as different regions, so it can bypass cache and fetch the data
directly from memory. In address space, we have two memory regions, one
as cached, the other as uncached. Thus, we also need an extra PMP entry
to protect OpenSBI blob from the uncached window. To do this, platform
code requires single_fw_region, otherwise, we'll run out of PMP entries.
EIC770X also have several feature disable/enable CSRs accessible in M
mode. By default many core features such as speculation and HW prefetch
are disabled, and M mode software is responsible of enabling. Hence,
introduce 4 new build time tunable parameters to Kconfig, which reflects
the values get updated to those CSRs:
- ESWIN_EIC770X_FEAT0_CFG
- ESWIN_EIC770X_FEAT1_CFG
- ESWIN_EIC770X_L1_HWPF_CFG
- ESWIN_EIC770X_L2_HWPF_CFG
The default values are somewhat optimal for generic workloads. They are
dumped when running SiFive's vendor OpenSBI, and in addition, with my
own tuning to address the perf regression reported by drmpeg [3]
To build the firmware+u-boot blob, Use the following, and docs [4] for
testing it with UART boot without flashing:
make FW_TEXT_START=0x80000000 \
FW_PAYLOAD_OFFSET=0x200000 \
FW_PAYLOAD_PATH=u-boot-nodtb.bin \
FW_PAYLOAD_FDT_ADDR=0xf8000000 \
FW_FDT_PATH=u-boot.dtb
[1] https://github.com/eswincomputing/EIC7700X-SoC-Technical-Reference-Manual
[2] https://github.com/geerlingguy/sbc-reviews/issues/82
[3] https://forums.sifive.com/t/low-1-core-stream-bandwidth/7274/15
[4] https://github.com/ganboing/EIC770x-Docs/blob/main/p550/bootchain/UART-Boot.md
Signed-off-by: Bo Gan <ganboing@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251218104243.562667-6-ganboing@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Describe Andes PPMA in the config option, and select it for AE350
platform.
Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
To make the framework suit all Andes CPUs, change all occurrences of
andes45 to andes.
In addition, we fix some coding style problems and remove an unused
macro in andes.h.
Signed-off-by: Ben Zong-You Xie <ben717@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Since all the SoC with thead c9xx cores need this initialization at now,
initialize the c9xx pmu in the thead generic platform by default.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Separate the implement of T-HEAD c9xx errata to allow any platform
with bug related to c9xx cores can use it.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Separate the implement of T-HEAD c9xx pmu to allow any platform with
c9xx cores can use it.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
The TLB entries remain functional all the time once added in T-HEAD th1520
and Sophgo sg2042 (even if the MMU is then disabled afterwards). If there
are some stale TLB entries that contains the address of SBI, it will cause
unexpected memory access and issue a illegal instruction error. To avoid
this, a TLB flush is needed to drop these TLB entries before any memory
access in the trap handler.
To handle this workaroud, add a custom trap handler with executing TLB flush
first in the T-HEAD platform to fix affected socs.
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
I/O Coherence Port (IOCP) provides an AXI interface for connecting
external non-caching masters, such as DMA controllers. The accesses
from IOCP are coherent with D-Caches and L2 Cache.
IOCP is a specification option and is disabled on the Renesas RZ/Five
SoC (which is based on Andes AX45MP core) due to this reason IP blocks
using DMA will fail.
As a workaround for SoCs with IOCP disabled CMO needs to be handled by
software. Firstly OpenSBI configures the memory region as
"Memory, Non-cacheable, Bufferable" and passes this region as a global
shared dma pool as a DT node. With DMA_GLOBAL_POOL enabled all DMA
allocations happen from this region and synchronization callbacks are
implemented to synchronize when doing DMA transactions.
SBI_EXT_ANDES_IOCP_SW_WORKAROUND checks if the IOCP errata should be
applied to handle cache management.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
On the Renesas RZ/Five SoC by default we want to configure 128MiB of memory
ranging from 0x58000000 as a non-cacheable + bufferable region in the PMA
and populate this region as PMA reserve DT node with shared DMA pool and
no-map flags set so that Linux drivers requesting any DMA'able memory go
through this region.
PMA node passed to the above stack:
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;
};
};
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
I/O Coherence Port (IOCP) provides an AXI interface for connecting
external non-caching masters, such as DMA controllers. The accesses
from IOCP are coherent with D-Caches and L2 Cache.
IOCP is a specification option and is disabled on the Renesas RZ/Five
SoC due to this reason IP blocks using DMA will fail.
The 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.
Below are the memory attributes supported:
* Device, Non-bufferable
* Device, bufferable
* Memory, Non-cacheable, Non-bufferable
* Memory, Non-cacheable, Bufferable
* Memory, Write-back, No-allocate
* Memory, Write-back, Read-allocate
* Memory, Write-back, Write-allocate
* Memory, Write-back, Read and Write-allocate
More info about PMA (section 10.3):
Link: http://www.andestech.com/wp-content/uploads/AX45MP-1C-Rev.-5.0.0-Datasheet.pdf
As a workaround for SoCs with IOCP disabled CMO needs to be handled by
software. Firstly OpenSBI configures the memory region as
"Memory, Non-cacheable, Bufferable" and passes this region as a global
shared dma pool as a DT node. With DMA_GLOBAL_POOL enabled all DMA
allocations happen from this region and synchronization callbacks are
implemented to synchronize when doing DMA transactions.
Example PMA region passed as a DT node from OpenSBI:
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;
};
};
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This patch adds atcsmu support for Andes AE350 platforms. The SMU
provides system management capabilities, including clock, reset
and power control based on power domain partitions.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
We move andes directory to platform/generic as the necessary fdt
drivers are available, the users can enable the console, timer, ipi,
irqchip and reset devices by adding device tree nodes stated in the
docs/platform/andes-ae350.md.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
We update generic platform to use kconfig for enabling/disabling
platform overrides. We also enable all platform overrides in generic
platform defconfig.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Tested-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Atish Patra <atishp@rivosinc.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
We extend the top-level makefile to allow kconfig based configuration
for each platform where each platform has it's own set of configs with
"defconfig" being the default config.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Tested-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Atish Patra <atishp@rivosinc.com>
Tested-by: Atish Patra <atishp@rivosinc.com>
