Commit Graph

61 Commits (1ddbacb67fdfc1c143f6754542f5cbf8587b9b25)

Author SHA1 Message Date
Anton Blanchard aa1d2b16d7 litedram: Regenerate
Regenerate from upstream litex. Something in the update has improved
memory read and write performance quite a lot on my Nexys Video:

Before:

  Write speed: 83.2MiB/s
   Read speed: 140.4MiB/s

After:

  Write speed: 352.1MiB/s
   Read speed: 218.5MiB/s

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
2 years ago
Anton Blanchard e0bf743d7a litedram: MIGEN_GIT_SHA1 no longer defined
MIGEN_GIT_SHA1 is no longer defined in upstream litex, so remove it.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
2 years ago
Raptor Engineering Development Team fcb783a0fb Extend LiteDRAM VHDL wrapper to allow more than one clock line
This is necessary for the upcoming Arctic Tern system enablement,
since Arctic Tern uses two DRAM devices and a separate clock line
is routed to each device.  LiteX handles this behavior correctly,
therefore we assume other hardware exists that uses a similar
DRAM clock design.

Updates from Mikey to fix some compile issues.

Signed-off-by: Timothy Pearson <tpearson@raptorengineering.com>
Signed-off-by: Michael Neuling <mikey@neuling.org>
2 years ago
Matt Johnston 8901e84d8d litedram: Add orangecrab-85-0.2 target
Parameters are based on
https://github.com/gregdavill/OrangeCrab-test-sw/blob/main/hw/OrangeCrab-bitstream.py
and litex-boards orangecrab.py

rtt_nom and cmd_delay are overridden for OrangeCrab, we do the same here.

Generated with litedram and litex
62abf9c ("litedram_gen: Add block_until_ready port parameter to control blocking behaviour.")
add2746a ("tools/litex_cli: Rename wb to bus.")

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
2 years ago
Matt Johnston 08021ae28e litedram: set Makefile -Werror
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
2 years ago
Matt Johnston 5a3cdc8b22 litedram: disable block_until_ready, regenerate
Recent litedram gets stuck at memtest unless block_until_ready=False.
(discussion in https://github.com/enjoy-digital/litedram/pull/292)

This change regenerates with latest litedram and litex
62abf9c ("litedram_gen: Add block_until_ready port parameter to control blocking behaviour.")
add2746a ("tools/litex_cli: Rename wb to bus.")

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
2 years ago
Benjamin Herrenschmidt d564672a82 Regenerate litedram and liteeth
Note: There are a few patches to upstream to fix an upstream breakage
of litedram standalone generator, and fix some issues with liteeth
in the way it's used on Wukong. All these have pending pull requests.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2 years ago
Benjamin Herrenschmidt da0189af1e Add support for QMTech Wukong v2 board
For now only the V2 of the board (slightly different pinout)
and only the A100T variant. I also haven't added GPIOs or anything
else on the PMODs really.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2 years ago
Benjamin Herrenschmidt 4b1a413a2f Add support for more spansion flash
That's the one on the Wukong v2

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2 years ago
Paul Mackerras ca4eb46aea Make wishbone addresses be in units of doublewords or words
This makes the 64-bit wishbone buses have the address expressed in
units of doublewords (64 bits), and similarly for the 32-bit buses the
address is in units of words (32 bits).  This is to comply with the
wishbone spec.  Previously the addresses on the wishbone buses were in
units of bytes regardless of the bus data width, which is not correct
and caused problems with interfacing with externally-generated logic.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2 years ago
Anton Blanchard c0f7f54276 litedram: Regenerate from upstream litex
This adds Joel's sdcard feature reporting to the firmware.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Joel Stanley bc3995804f litedram: Add sdcard to soc features
Signed-off-by: Joel Stanley <joel@jms.id.au>
3 years ago
Anton Blanchard 780d6c754c litedram: Regenerate from upstream litex
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 07f2edc415 litedram: sdrinit() is now sdram_init()
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 346686feb8 litedram: Fix compiler warning
define MAIN_RAM_BASE and MAIN_RAM_SIZE as unsigned long

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard ac546a3024 litedram: Update yaml files
Update the litedram yaml files based on latest upstream.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 6034a9e31f litedram: simplify generate.py
We can call litedram_gen instead of doing the work ourselves.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 3275304a7f litedram: Remove variables.mak
Instead of creating variables.mak, just pass the variables in on
the make command line.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Boris Shingarov 679c547e5f fpga: Add support for Genesys2
Signed-off-by: Boris Shingarov <shingarov@labware.com>
4 years ago
Benjamin Herrenschmidt dbb137437c acorn: Add support for the Acorn CLE 215+
This is a NiteFury based PCIe M2 form-factor board originally
used for mining. It contains a speed grade 2 Artix 7 200T,
1GB of DDR3 and 32MB of flash.

The serial port is routed to pin 2 (RX) and 3 (TX) of the P2
connector (pin 1 is GND).

Note: Only 16MB of flash is currently usable until code is added
to configure the flash controller to use 4-bytes address commands
on that part.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt ac81bb17ac litedram: Regenerate
This regenerate litedram for all targets (genesys2 is new in this
build) using the latest LiteX.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 079af6443e litedram: Update generator to work with latest LiteX
Some changes in LiteX broke us. Adapt the build system and
increase the init RAM size to 24KB.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt cc35c49928 litedram: Add generator for Genesys2
(Not yet generated)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt bedc9c0085 litedram: l2: Add a few comments about litedram behaviour
litedram ignores a couple of signals of his "pseudo-axi" port,
this adds a bit of documentation around it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 02abb135a8 litedram: l2: Add support for more geometries
Make the DRAM data lines and user port width configurable, also
don't hard wire dependency on the wishbone data width.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 1441b2a859 litedram: l2: Latency improvements
This implements in the L2 cache the feature already in the L1s
allowing a request to be completed before the end of a refill
using partial line valid bits, and starting a refill from the
row of the first miss on that line instead of the beginning of
the line.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Michael Neuling 57604c1a6e
Merge pull request #213 from ozbenh/uart16550
Add support for standard 16550 style UART
4 years ago
Michael Neuling 9bbef035a6
Merge pull request #212 from ozbenh/liteeth
liteeth: Hook up LiteX LiteEth ethernet controller
4 years ago
Boris Shingarov 49f1389a21 Fix ld error in elf maketarget
The sdram_init ELF fails to link:

powerpc64le-linux-gnu-ld -static -nostdlib -T sdram_init.lds \
    --gc-sections -o sdram_init.elf head.o main.o sdram.o console.o \
    libc.o sdram_init.lds
powerpc64le-linux-gnu-ld: error: linker script file 'sdram_init.lds'
    appears multiple times
make: *** [Makefile:70: sdram_init.elf] Error 1

This is because sdram_init.lds is one of the prerequisites, and thus is
contained in $^.  However, it is also explicitly specified as part of
LDFLAGS, as the argument to -T.

Signed-off-by: Boris Shingarov <shingarov@labware.com>
4 years ago
Benjamin Herrenschmidt d654667304 console: Add support for the 16550 UART
And rebuild various binaries

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt e3941109af console: Cleanup console API
Use a more generic console_init() instead of potato_uart_init(),
and do the same for interrupt control. There should be no
change in behaviour.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 8366710217 liteeth: Hook up LiteX LiteEth ethernet controller
Currently only generated for Arty.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt f9f18906a3 soc: Rename wb_dram_ctrl to wb_ext_io and rework decoding
This makes the control bus currently going out of "soc" towards
litedram more generic for external IO devices added by the
top-level rather than inside the SoC proper.

This is mostly renaming of signals and a small change on how the
address decoder operates, using a separate "cascaded" decode for
the external IOs.

We make the region 0xc8nn_nnnn be the "external IO" region for
now.

This will make it easier / cleaner to add more external devices.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 6aadad5a75 spi: Add booting from flash to litedram init
It will look for an ELF binary at the flash offset specified
for the board (currently 0x300000 on Arty but that could be
changed).

Note: litedram is regenerated in order to rebuild the init code,
which was done using a newer version of litedram from LiteX.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 15467fe536 litedram: L2 use latched refill_index
Not a huge difference since wb_req is itself a latch but
may as well

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 05bbbf0772 litedram: Pipeline store acks in L2
There is a long timing path to generate the ack signal from
the L2 cache as it's fully combinational for stores, including
signals coming from litedram.

Instead, pipeline the store acks. This will introduce a cycle
latency but should improve timing. Also the core will eventually
be smart enough not to wait for store acks to complete them anyway.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt b58ff724f6 litedram: Add stash buffer to the L2 cache wishbone interface
This breaks the long stall signal coming back to the processor
and helps improve overall timing.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt b23fd6c5f1 litedram: Defer clearing of tags & valids to improve timing
Currently, there's a huge mux gathering the output of all the PLRUs
to select the victim way on cache miss. This is fed combinationally
into the clearing of the valid and tags.

In order to help timing, let's store it instead and perform the
clearing on the next cycle. The L2 doesn't respond to requests
when not in IDLE state so this should have no negative effects.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 63f10450a6 litedram: Fix DRAM init mem using too many address bits
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt a93d9e77c9 litedram: Remove remnants of riscv-inits
We still had some wires bringing an extra serial port out of
litedram for the built-in riscv processor. This is all gone now
so take them out.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 3167515069 sw: Properly mask syscon register fields
Some fields might get extended with extra bits, use the appropriate
masks when reading the values.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt b0e15f2fb5 litedram: Make the L2 twice as tall
This increases the number of L2 lines from 32 to 64. The BRAM usage is the
same as they were only half used. There's an increase in LUTs and registers
due to the extra tags and valid bits, but none of it should be in a
space constrained or critical timing path.

We could make it wider instead (256 bytes lines) which would reduce usage
instead, but this increases the latency by 8 cycles. Something to consider
once the L2 is capable of early response on miss and starting reloads
from any point in a line.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 599fad117b litedram: Remove old "VexRiscV" based initializations
Support for this has bitrotted and would require refactoring of L2 to
be brought back. It's also not really needed anymore now that we ship
pre-generated litedram and that LiteX supports what we do.

So take it out, which simplifies some of the scripts as well. This also
fixes up CSR alignment the sim model.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt eaf6883e57 litedram: Update to latest LiteX/LiteDRAM version
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 6828e93113 litedram: Test bench
The test bench test simple access forms for now, it's a starting point
but it already helped find/fix a bug.

Includes a litedram update to be able to operate the sim model without
inits.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt a3857aac94 litedram: Add an L2 cache with store queue
This adds a cache between the wishbone and litedram with the following
features (at this point, it's still evolving)

  - 128 bytes line width in order to have a reasonable amount of
litedram pipelining on the 128-bit wide data port.

  - Configurable geometry otherwise

  - Stores are acked immediately on wishbone whether hit or miss
(minus a 2 cycles delay if there's a previous load response in the
way) and sent to LiteDRAM via 8 entries (configurable) store queue

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt bf1b98b958 litedram: Add support for booting without BRAM
This adds an option to disable the main BRAM and instead copy a
payload stashed along with the init code in the secondary BRAM
into DRAM and boot from there

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 6fe077910b litedram: Add simulation support
This adds a simulated litedram model along with the necessary
Makefile gunk to verilate it and wrap it for use by ghdl.

The core_dram_tb test bench is a variant of core_tb with
LiteDRAM simulated. It's not built by default, an explicit

make core_dram_tb

is necessary as to not require verilator to be installed for
the normal build process (also it's slow'ish).

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 12f36b4a35 litedram: Split the init memory from the main wrapper
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago
Benjamin Herrenschmidt 573b6b4bc4 soc: Rework interconnect
This changes the SoC interconnect such that the main 64-bit wishbone out
of the processor is first split between only 3 slaves (BRAM, DRAM and a
general "IO" bus) instead of all the slaves in the SoC.

The IO bus leg is then latched and down-converted to 32 bits data width,
before going through a second address decoder for the various IO devices.

This significantly reduces routing and timing pressure on the main bus,
allowing to get rid of frequent timing violations when synthetizing on
small'ish FPGAs such as the Artix-7 35T found on the original Arty board.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
4 years ago