From 4e78ad4d915147dec4178a2115475d8d5eee8c0e Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Mon, 19 Feb 2024 20:00:38 +0000
Subject: [PATCH] enable rmtfs: file server for remote processors

(I'm guessing it's actually more of a "block storage" service as it
expects to serve straight from mmc partitions with no filesystem in
sight)

This is step 1 towards getting the modem working, and also seems to
have initialised the audio

[  682.111619] remoteproc remoteproc1: remote processor 4080000.remoteproc is now up
[...]
[  682.580706] input: msm8916 Headset Jack as /devices/platform/soc@0/7702000.sound/sound/card0/input5
[  687.912897] wwan wwan0: port wwan0at0 attached
[  687.914081] wwan wwan0: port wwan0at1 attached
[  687.944139] wwan wwan0: port wwan0qmi0 attached
---
 configuration.nix | 37 +++++++++++++++++++++++++++++++++----
 1 file changed, 33 insertions(+), 4 deletions(-)

diff --git a/configuration.nix b/configuration.nix
index 64942ac..8d5eb3d 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -88,10 +88,14 @@ in {
 
 #    environment.systemPackages = [ qrtr tqftpserv ];
     services.udev.extraRules = ''
-      # copied from https://github.com/andersson/rpmsgexport
-      ACTION=="add", SUBSYSTEM=="rpmsg", KERNEL=="rpmsg_ctrl[0-9]*", ATTRS{rpmsg_name}=="pronto", RUN+="${rpmsgexport}/bin/rpmsgexport /dev/$name APPS_RIVA_CTRL"
-      SUBSYSTEM=="rpmsg", KERNEL=="rpmsg_ctrl[0-9]*", ATTRS{rpmsg_name}=="?*", SYMLINK+="rpmsg/$attr{rpmsg_name}/ctrl"
-      SUBSYSTEM=="rpmsg", KERNEL=="rpmsg[0-9]*", ATTR{name}=="?*", ATTRS{rpmsg_name}=="?*", SYMLINK+="rpmsg/$attr{rpmsg_name}/$attr{name}"
+       SUBSYSTEM!="rpmsg", GOTO="qcom_rpmsg_end"
+       # symlink rpmsg endpoints under useful names
+       ATTR{name}=="DATA5_CNTL", SYMLINK+="modem"
+       # open SMD channels when the remoteproc comes up
+       KERNEL!="rpmsg_ctrl[0-9]*", GOTO="qcom_rpmsg_end"
+       ATTRS{rpmsg_name}!="modem|hexagon", GOTO="qcom_rpmsg_end"
+       ACTION=="add", RUN+="${rpmsgexport}/bin/rpmsgexport /dev/$name DATA5_CNTL"
+       LABEL="qcom_rpmsg_end"
     '';
     environment.systemPackages = with pkgs; [ drm-framebuffer];
 
@@ -111,5 +115,30 @@ in {
     hardware.opengl = {
       enable = true; driSupport = true;
     };
+
+    systemd.services = {
+      rmtfs =
+        # the four files in here are partition images:
+        #  partlabel => filename
+        #  modemst1  => modem_fs1
+        #  modemst2  => modem_fs2
+        #  fsc       => modem_fsc
+        #  fsg       => modem_fsg
+
+        let files = pkgs.runCommand "rmtfs" {} ''
+          mkdir -p $out/lib/firmware
+          cp ${./local/uncompressed-firmware/rmtfs}/* $out/lib/firmware
+        '';
+        in {
+          wantedBy = [ "multi-user.target" ];
+          serviceConfig = {
+            # https://github.com/andersson/rmtfs/blob/7a5ae7e0a57be3e09e0256b51b9075ee6b860322/rmtfs.c#L507-L541
+            ExecStart = "${pkgs.rmtfs}/bin/rmtfs -s -r -o ${files}/lib/firmware";
+            Restart = "always";
+            RestartSec = "10";
+          };
+        };
+    };
+
   };
 }