feature: add SFP0..3 LED indication

io_expander.rs: add virtual_led_mapping in IoExpander
                set SFP LED at .service()
kasli_soc.py: add virtual_leds csr device
              couple virtual_leds.get(i) with rx_ready status
runtime main: add async task io_expanders_service()
satman main: add io_expander service after link up/down

src/gateware/kasli_soc.py

@@ -10,6 +10,7 @@ from migen.genlib.cdc import MultiReg
 from migen_axi.integration.soc_core import SoCCore
 from migen_axi.platforms import kasli_soc
 from misoc.interconnect.csr import *
+from misoc.cores import virtual_leds
 from misoc.integration import cpu_interface
 
 from artiq.coredevice import jsondesc
@@ -321,6 +322,11 @@ class GenericMaster(SoCCore):
             self.config["HAS_GRABBER"] = None
             self.add_csr_group("grabber", self.grabber_csr_group)
 
+        self.submodules.virtual_leds = virtual_leds.VirtualLeds()
+        self.csr_devices.append("virtual_leds")
+
+        self.comb += [self.virtual_leds.get(i).eq(channel.rx_ready)
+                for i, channel in enumerate(self.drtio_transceiver.channels)]
 
 class GenericSatellite(SoCCore):
     def __init__(self, description, acpki=False):
@@ -480,6 +486,11 @@ class GenericSatellite(SoCCore):
             self.add_csr_group("grabber", self.grabber_csr_group)
             # no RTIO CRG here
      
+        self.submodules.virtual_leds = virtual_leds.VirtualLeds()
+        self.csr_devices.append("virtual_leds")
+
+        self.comb += [self.virtual_leds.get(i).eq(channel.rx_ready)
+                for i, channel in enumerate(self.drtio_transceiver.channels)]
 
 def write_mem_file(soc, filename):
     with open(filename, "w") as f:

src/libboard_artiq/src/io_expander.rs

@@ -1,6 +1,8 @@
 use libboard_zynq::i2c;
 use log::info;
 
+use crate::pl::csr;
+
 // Only the bare minimum registers. Bits/IO connections equivalent between IC types.
 struct Registers {
     // PCA9539 equivalent register names in comments
@@ -31,6 +33,7 @@ const IODIR1: [u8; 2] = [
 
 pub struct IoExpander {
     address: u8,
+    virtual_led_mapping: &'static [(u8, u8, u8)],
     iodir: [u8; 2],
     out_current: [u8; 2],
     out_target: [u8; 2],
@@ -39,11 +42,18 @@ pub struct IoExpander {
 
 impl IoExpander {
     pub fn new(i2c: &mut i2c::I2c, index: u8) -> Result<Self, &'static str> {
+        #[cfg(hw_rev = "v1.0")]
+        const VIRTUAL_LED_MAPPING0: [(u8, u8, u8); 2] = [(0, 0, 6), (1, 1, 6)];
+        #[cfg(hw_rev = "v1.1")]
+        const VIRTUAL_LED_MAPPING0: [(u8, u8, u8); 2] = [(0, 0, 7), (1, 1, 6)];
+
+        const VIRTUAL_LED_MAPPING1: [(u8, u8, u8); 2] = [(2, 0, 6), (3, 1, 6)];
 
         // Both expanders on SHARED I2C bus
         let mut io_expander = match index {
             0 => IoExpander {
                 address: 0x40,
+                virtual_led_mapping: &VIRTUAL_LED_MAPPING0,
                 iodir: IODIR0,
                 out_current: [0; 2],
                 out_target: [0; 2],
@@ -56,6 +66,7 @@ impl IoExpander {
             },
             1 => IoExpander {
                 address: 0x42,
+                virtual_led_mapping: &VIRTUAL_LED_MAPPING1,
                 iodir: IODIR1,
                 out_current: [0; 2],
                 out_target: [0; 2],
@@ -143,6 +154,12 @@ impl IoExpander {
     }
 
     pub fn service(&mut self, i2c: &mut i2c::I2c) -> Result<(), &'static str> {
+        #[cfg(has_virtual_leds)]
+        for (led, port, bit) in self.virtual_led_mapping.iter() {
+            let level = unsafe { csr::virtual_leds::status_read() >> led & 1 };
+            self.set(*port, *bit, level != 0);
+        }
+
         if self.out_target != self.out_current {
             self.select(i2c)?;
             if self.out_target[0] != self.out_current[0] {

src/runtime/src/main.rs

@@ -11,6 +11,7 @@
 
 extern crate alloc;
 
+use core::cell::RefCell;
 use log::{info, warn, error};
 
 use libboard_zynq::{timer::GlobalTimer, mpcore, gic};
@@ -91,6 +92,24 @@ async fn report_async_rtio_errors() {
 
 
 
+#[cfg(feature = "target_kasli_soc")]
+async fn io_expanders_service(
+    i2c_bus: RefCell<&mut libboard_zynq::i2c::I2c>,
+    io_expander0: RefCell<io_expander::IoExpander>,
+    io_expander1: RefCell<io_expander::IoExpander>,
+) {
+    loop {
+        task::r#yield().await;
+        io_expander0
+            .borrow_mut()
+            .service(&mut i2c_bus.borrow_mut())
+            .expect("I2C I/O expander #0 service failed");
+        io_expander1
+            .borrow_mut()
+            .service(&mut i2c_bus.borrow_mut())
+            .expect("I2C I/O expander #1 service failed");
+    }
+}
 static mut LOG_BUFFER: [u8; 1<<17] = [0; 1<<17];
 
 #[no_mangle]
@@ -149,5 +168,11 @@ pub fn main_core0() {
 
     task::spawn(report_async_rtio_errors());
 
+    #[cfg(feature = "target_kasli_soc")]
+    task::spawn(io_expanders_service(
+        RefCell::new(i2c_bus),
+        RefCell::new(io_expander0),
+        RefCell::new(io_expander1),
+    ));
     comms::main(timer, cfg);
 }

src/satman/src/main.rs

@@ -524,6 +524,16 @@ pub extern fn main_core0() -> i32 {
             for mut rep in repeaters.iter_mut() {
                 rep.service(&routing_table, rank, &mut timer);
             }
+            #[cfg(feature = "target_kasli_soc")]
+            {
+                io_expander0
+                    .service(&mut i2c)
+                    .expect("I2C I/O expander #0 service failed");
+                io_expander1
+                    .service(&mut i2c)
+                    .expect("I2C I/O expander #1 service failed");
+            }
+
             hardware_tick(&mut hardware_tick_ts, &mut timer);
         }
 
@@ -545,6 +555,15 @@ pub extern fn main_core0() -> i32 {
             for mut rep in repeaters.iter_mut() {
                 rep.service(&routing_table, rank, &mut timer);
             }
+            #[cfg(feature = "target_kasli_soc")]
+            {
+                io_expander0
+                    .service(&mut i2c)
+                    .expect("I2C I/O expander #0 service failed");
+                io_expander1
+                    .service(&mut i2c)
+                    .expect("I2C I/O expander #1 service failed");
+            }
             hardware_tick(&mut hardware_tick_ts, &mut timer);
             if drtiosat_tsc_loaded() {
                 info!("TSC loaded from uplink");