Commit Graph

1281 Commits (c4492c843a6d4c61df7e0134c3b13342599b1102)
 

Author SHA1 Message Date
Paul Mackerras e33fb26e7a PMU: Fix PMC5/6 behaviour when MMCR0[PMCC] = 11
The architecture states that when MMCR0[PMCC] = 0b11, PMC5 and PMC6
are not part of the Performance Monitor, meaning that they are not
controlled by bits in MMCRs, and counter negative conditions in PMCs 5
and 6 don't generate Performance Monitor alerts, exceptions or
interrupts.  It doesn't say that PMC5 and PMC6 are frozen in this
case, so presumably they should continue to count run instructions and
run cycles.

This implements that behaviour.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
3 years ago
Anton Blanchard 591e96d1a2 gpio: Add HAS_GPIO to avoid verilator build errors
The verilator build fails with warnings and errors, because NGPIO
is 0 and we do things like:

        gpio_out : out std_ulogic_vector(NGPIO - 1 downto 0);

Set NGPIO to something reasonable (eg 32) and add HAS_GPIO to avoid
building the macro entirely if it isn't in use.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard bc0f7cf236 Rename 'do' signal to avoid verilator System Verilog warning
Experimenting with using ghdl to do VHDL to Verilog conversion (instead
of ghdl+yosys), verilator complains that a signal is a SystemVerilog
keyword:

%Error: microwatt.v:15013:18: Unexpected 'do': 'do' is a SystemVerilog keyword misused as an identifier.
        ... Suggest modify the Verilog-2001 code to avoid SV keywords, or use `begin_keywords or --language.

We could probably make this go away by disabling SystemVerilog, but
it's easy to rename the signal in question. Rename di at the same
time.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Michael Neuling 2bd00f5119
Merge pull request #315 from paulusmack/pmu
Add basic PMU implementation
3 years ago
Paul Mackerras 1896e5f803
Merge pull request #314 from antonblanchard/yosys-go-fast-bits
Reduce Yosys ECP5 cell usage by 30% with -abc9 -nowidelut
3 years ago
Michael Neuling 400e481ffa
Merge pull request #313 from paulusmack/fixes
Fix bug causing FP unavailable interrupts to be missed
3 years ago
Paul Mackerras a7873b45f7 core: Add a basic performance monitor unit (PMU) implementation
This is the start of an implementation of a PMU according to PowerISA
v3.0B.  Things not implemented yet include most architected events,
the BHRB, event-based branches, thresholding, MMCR0[TBCC] field, etc.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
3 years ago
Anton Blanchard 6254bb5ee9 Reduce Yosys ECP5 cell usage by 30% with -abc9 -nowidelut
We've been investigating why the barrel rotator uses an enormous
number of cells on the yosys ECP5 target. Eventually it was narrowed
down to the -abc9 -nowidelut options, which see the cell count go from
4985 cells to 841 cells.

Using the same options on an Orange Crab build reduces the cell count
from 50864 to 36085. The main differences:

     LUT4                        31040 -> 25270
     PFUMX                        6956 ->     0
     L6MUX21                      1746 ->     0
     CCU2C                        2066 ->  1759

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Michael Neuling aa4e4e77c4
Merge pull request #311 from antonblanchard/litesdcard-nexys-video
Update litesdcard from upstream and add Nexys Video support
3 years ago
Michael Neuling 65c131e89f
Merge pull request #312 from shenki/sdcard-soc-features
litedram: Add sdcard to soc features
3 years ago
Paul Mackerras f40842d9b2 tests/fpu: Test FPU unavailable interrupt following a load
This adds a load before a floating-point load which should generate a
floating-point unavailable interrupt, to test for the bug where
unavailability interrupts can get dropped while loadstore1 is
executing instructions.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
3 years ago
Joel Stanley bc3995804f litedram: Add sdcard to soc features
Signed-off-by: Joel Stanley <joel@jms.id.au>
3 years ago
Paul Mackerras 64e3ce7134 execute1: Handle interrupts during sequences of load/store operations
At present the logic prevents any interrupts from being handled while
there is a load/store instruction (one that has unit=LDST) being
executed.  However, load/store instructions can still get sent to
loadstore1.  Thus an instruction which should generate an interrupt
such as a floating-point unavailable interrupt will instead get
executed.

To fix this, when we detect that an interrupt should be generated but
loadstore1 is still executing a previous instruction, we don't execute
any new instructions, and set a new r.intr_pending flag.  That results
in busy_out being asserted (meaning that no further instructions will
come in from decode2).  When loadstore1 has finished the instructions
it has, the interrupt gets sent to writeback.  If one of the
instructions in loadstore1 generates an interrupt in the meantime, the
l_in.interrupt signal gets asserted and that clears r.intr_pending, so
the interrupt we detected gets discarded.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
3 years ago
Anton Blanchard 7cfbcd5514 litesdcard: Add Nexys Video support
This board has a reset line that needs to be held low to power up the
SD card hardware.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 9caaa3fc46 litesdcard: Use vendor not board type
litesdcard provides a macro per vendor (eg xilinx, lattice) and not per
board, so modify the fusesoc generator to take a vendor. This will make
it easier to add litesdcard to more boards.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Paul Mackerras c198b2b82e
Merge pull request #310 from antonblanchard/liteeth-update-2
Update liteeth from upstream and add Nexys Video support
3 years ago
Anton Blanchard 34e10cc52c liteeth: Regenerate from upstream litex
Unfortunately the CSR layout has shifted on upstream litex, so this
is built with the following litex patch backed out:

aad56a047a33 ("integration/soc: Use CSR automatic allocation.")

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 12efb51bcc liteeth: Update yaml config
csr_data_width is no longer required. Add ntxslots and nrxslots
parameters but set them to the default value.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 458dfe01a6 Add liteeth support to Nexys Video
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Michael Neuling cf6df4f17f
Merge pull request #307 from antonblanchard/litedram-update
Updating to latest upstream litedram and some cleanups to associated scripts
3 years ago
Michael Neuling 69a1440204
Merge pull request #309 from antonblanchard/clk-cleanup
Small cleanups to clock definitions
3 years ago
Michael Neuling b885ee7ed1
Merge pull request #308 from antonblanchard/small-fixes
Fix some whitespace issues
3 years ago
Anton Blanchard 75e06a1e30 Remove -add from xdc files
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 187199c489 Remove -waveform from xdc files
A 50% duty cycle is the default, so no need to use -waveform.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 7994b98404 Fix some whitespace issues
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
3 years ago
Anton Blanchard 46cde3bb23
Merge pull request #305 from mikey/noflatten
ci: Remove noflatten to reduce size of ECP5 builds
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
Michael Neuling d6efbb327f ci: Remove noflatten to reduce size of ECP5 builds
This option was added in the commit but is no longer needed for github
CI to work.

    commit ef0dcf3bc6
    Author: Michael Neuling <mikey@neuling.org>
    Date:   Thu Jul 2 14:36:14 2020 +1000
    Add SYNTH_ECP5_FLAGS option for building

Removing noflatten has the added advantage that it gets our builds
from 75% down to 59% usage on ECP5 85K.

Signed-off-by: Michael Neuling <mikey@neuling.org>
3 years ago
Anton Blanchard 0199ff8ca8
Merge pull request #299 from mikey/vunit-make
makefile: Add check_vunit
3 years ago
Michael Neuling 25ab1053e9
Merge pull request #304 from umarcor/ci-backends
ci: test 'build' with LLVM and GCC backends
3 years ago
umarcor de41dfc703 ci: test 'build' with LLVM and GCC backends
Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>
3 years ago
Michael Neuling 0cd826d190
Merge pull request #301 from umarcor/vunit-cleanup
VUnit cleanup
3 years ago
Michael Neuling bf76261979 makefile: Add check_vunit
Allow newly added vuint run script to be run via make. Also integrate
with DOCKER/PODMAN=1.

Signed-off-by: Michael Neuling <mikey@neuling.org>
3 years ago
umarcor 178c2a7da3 VUnit: style
Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>
3 years ago
umarcor 2031c6d2d2 VUnit: use Path.glob instead of glob.glob
Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>
3 years ago
umarcor 7571416f81 ci: add 'workflow_dispatch'
Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>
3 years ago
umarcor faf8309629 ci: in job 'VUnit' use a container step instead of a container job
Signed-off-by: umarcor <unai.martinezcorral@ehu.eus>
3 years ago
Michael Neuling d7458d5beb
Reduce the size of icache to help yosys ECP5 builds (#303)
The icache RAM is currently LUT ram not block ram. This massively
bloats the icache size. We think this is due to yosys not inferencing
the RAM correctly but that's yet to be confirmed.

Work around this for now by reducing the default size of the icache
RAM for the ECP5 builds.

On the ECP5 85K builts, this gets us from 95% down to 76% and helps
our CI to pass.

Signed-off-by: Michael Neuling <mikey@neuling.org>
3 years ago
Michael Neuling f9654428ff
Merge pull request #296 from LarsAsplund/logging-checking
Replaced VHDL assert and report with VUnit checking and logging
3 years ago
Michael Neuling 9e3c756234
Merge pull request #298 from paulusmack/master
MMU: Implement a vestigial partition table
3 years ago
Michael Neuling ff7421c54e
Merge pull request #295 from LarsAsplund/master
Run VHDL tests with VUnit
3 years ago
Paul Mackerras 18120f153d MMU: Implement a vestigial partition table
This implements a 1-entry partition table, so that instead of getting
the process table base address from the PRTBL SPR, the MMU now reads
the doubleword pointed to by the PTCR register plus 8 to get the
process table base address.  The partition table entry is cached.

Having the PTCR and the vestigial partition table reduces the amount
of software change required in Linux for Microwatt support.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
3 years ago
Lars Asplund 478b787c10 Replaced VHDL assert and report with VUnit checking and logging
The VUnit log package is a SW style logging framework in VHDL and the check package is an assertion library doing its error reporting with VUnit logging.
These testbenches don't use, and do not need, very advanced logging/checking features but the following was possible to improve

- Checking equality in VHDL can be quite tedious with a lot of type conversions and long message strings to explain the data received and what was expected.
  VUnit's check_equal procedure allow comparison between same or similar types and automatically create the error message for you.
- The code has report statements used for testbench progress reporting and debugging. These were replaced with the info and debug procedures.
  info logs are visible by default while debug is not. This means that debug logs don't have to be commented, which they are now, when not used.
  Instead there is a show procedure making debug messages visible. The show procedure has been commented to hide the debug messages but a more elegant
  solution is to control visibility from a generic and then set that generic from the command line. I've left this as a TODO but the run script allow you to
  extend the standard CLI of VUnit to add new options and you can also set generics from the run script.
- VUnit log messages are color coded if color codes are supported by the terminal. It makes it quicker to spot messages of different types when there are many log messages.
  Error messages will always be made visible on the terminal but you must use the -v (verbose) to see other logs.
- Some tests have a lot of "metvalue detected" warning messages from the numeric_std package and these clutter the logs when using the -v option. VUnit has a simulator independent
  option allowing you to suppress those messages. That option has been enabled.

Signed-off-by: Lars Asplund <lars.anders.asplund@gmail.com>
3 years ago
Lars Asplund 0865704e21 Run VUnit tests in CI
Signed-off-by: Lars Asplund <lars.anders.asplund@gmail.com>
3 years ago
Lars Asplund 0940b8a9d3 Organized VUnit testbenches into test cases.
Several of the testbenches have stimuli code divided into sections preceded with a header comment explaining
what is being tested. These sections have been made into VUnit test cases. The default behavior of VUnit is
to run each test case in a separate simulation which comes with a number of benefits:

* A failing test case doesn't prevent other test cases to be executed
* Test cases are independent. A test case cannot fail as a side-effect to a problem with another test case
* Test execution can be more parallelized and the overall test execution time reduced

Signed-off-by: Lars Asplund <lars.anders.asplund@gmail.com>
3 years ago