gnu: Add prjtrellis.

* gnu/packages/electronics.scm (prjtrellis): New variable.

Change-Id: Iac188df00f55c06f9000fe1b688d6cded9d495fd
Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/packages/electronics.scm

@@ -422,6 +422,65 @@ such as:
 @end itemize")
     (license license:expat)))
 
+(define-public prjtrellis
+  (package
+    (name "prjtrellis")
+    (version "1.4")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/YosysHQ/prjtrellis/")
+             (commit version)
+             ;; Pull the bitstream database for ECP5 devices; this is useful
+             ;; only by prjtrellis: there is no need to package it separately.
+             (recursive? #t)))
+       (file-name (git-file-name name version))
+       (modules '((guix build utils)))
+       (snippet
+        ;; Remove bundled source code for which Guix has packages.
+        '(with-directory-excursion "libtrellis/3rdparty"
+           (for-each delete-file-recursively
+                     '("pybind11"))))
+       (sha256
+        (base32 "0c3asdfrjmnc6q3vawn3nfghgg43iajwy2zb8kck9d3wrypbhlmc"))))
+    (build-system cmake-build-system)
+    (arguments
+     (list
+      ;; The examples test directory requires nextpnr, using this package as a
+      ;; backend, which is provided by nextpnr-ecp5: the tests are to be run
+      ;; in this later package.
+      #:tests? #f
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'chdir
+            (lambda _
+              (chdir "libtrellis")))
+          ;; point to pybind11 include dir
+          (add-after 'chdir 'setenv-pybind11
+            (lambda* (#:key inputs #:allow-other-keys)
+              (setenv "PYBIND11_INCLUDE_DIR"
+                      (string-append #$(this-package-input "pybind11")
+                                     "/include/pybind11")))))))
+    (native-inputs (list python))
+    (inputs (list openocd boost pybind11))
+    (synopsis "Placement and routing for ECP5 FPGAs")
+    (description
+     "Project Trellis is a Nextpnr backend compatible with ECP5 FPGAs.
+The following features are currently available:
+@itemize
+@item logic slice functionality, including carries
+@item distributed RAM inside logic slices
+@item all internal interconnect
+@item basic IO, including tristate
+@item block RAM, using inference or manual instantiation
+@item multipliers using manual instantiation
+@item global networks and PLLs
+@item transcievers (DCUs.)
+@end itemize")
+    (home-page "https://github.com/YosysHQ/prjtrellis/")
+    (license license:expat)))
+
 (define-public opensta
   ;; There are no releases, we use last commit.
   (let ((commit "eb8d39a7dd81b5ca2582ad9bbce0fb6e094b3e0f")