src/libboard_artiq/src/io_expander.rs

@@ -1,4 +1,4 @@
-use crate::i2c;
+use libboard_zynq::i2c;
 use log::info;
 
 // Only the bare minimum registers. Bits/IO connections equivalent between IC types.
@@ -10,10 +10,9 @@ struct Registers {
     gpiob: u8,  // Output Port 1
 }
 
-pub struct IoExpander {
-    busno: i32,
-    port: u8,
-    address: i32,
+pub struct IoExpander<'a> {
+    i2c: &'a mut i2c::I2c,
+    address: u8,
     iodir: [u8; 2],
     out_current: [u8; 2],
     out_target: [u8; 2],
@@ -21,14 +20,13 @@ pub struct IoExpander {
 }
 
 
-impl IoExpander {
-    pub fn new(index: u8) -> Result<Self, &'static str> {
+impl<'a> IoExpander<'a> {
+    pub fn new(i2c: &'a mut i2c::I2c, index: u8) -> Result<Self, &'static str> {
 
         // Both expanders on SHARED I2C bus
         let mut io_expander = match index {
             0 => IoExpander {
-                busno: 0,
-                port: 11,
+                i2c,
                 address: 0x40,
                 iodir: [0xff; 2],
                 out_current: [0; 2],
@@ -41,8 +39,7 @@ impl IoExpander {
                 },
             },
             1 => IoExpander {
-                busno: 0,
-                port: 11,
+                i2c,
                 address: 0x42,
                 iodir: [0xff; 2],
                 out_current: [0; 2],
@@ -75,32 +72,31 @@ impl IoExpander {
         Ok(io_expander)
     }
 
-    fn select(&self) -> Result<(), &'static str> {
-        let mask: u16 = 1 << self.port;
-        i2c::switch_select(self.busno, 0x70, mask as u8 as i32);
-        i2c::switch_select(self.busno, 0x71, (mask >> 8) as u8 as i32);
+    fn select(&mut self) -> Result<(), &'static str> {
+        self.i2c.pca954x_select(0x70, None)?;
+        self.i2c.pca954x_select(0x71, Some(3))?;
         Ok(())
     }
 
-    fn write(&self, addr: u8, value: u8) -> Result<(), &'static str> {
-        i2c::start(self.busno);
-        i2c::write(self.busno, self.address as i32);
-        i2c::write(self.busno, addr as i32);
-        i2c::write(self.busno, value as i32);
-        i2c::stop(self.busno);
+    fn write(&mut self, addr: u8, value: u8) -> Result<(), &'static str> {
+        self.i2c.start()?;
+        self.i2c.write(self.address)?;
+        self.i2c.write(addr)?;
+        self.i2c.write(value)?;
+        self.i2c.stop()?;
         Ok(())
     }
 
-    fn check_ack(&self) -> Result<bool, &'static str> {
+    fn check_ack(&mut self) -> Result<bool, &'static str> {
         // Check for ack from io expander
         self.select()?;
-        i2c::start(self.busno);
-        let ack = i2c::write(self.busno, self.address);
-        i2c::stop(self.busno);
+        self.i2c.start()?;
+        let ack = self.i2c.write(self.address)?;
+        self.i2c.stop()?;
         Ok(ack)
     }
 
-    fn update_iodir(&self) -> Result<(), &'static str> {
+    fn update_iodir(&mut self) -> Result<(), &'static str> {
         self.write(self.registers.iodira, self.iodir[0])?;
         self.write(self.registers.iodirb, self.iodir[1])?;
         Ok(())

src/libboard_artiq/src/lib.rs

@@ -27,6 +27,8 @@ pub mod drtioaux_async;
 #[cfg(has_drtio)]
 #[path = "../../../build/mem.rs"]
 pub mod mem;
+#[cfg(feature = "target_kasli_soc")]
+pub mod io_expander;
 
 use core::{cmp, str};
 

src/runtime/src/main.rs

@@ -21,7 +21,7 @@ use nb;
 use void::Void;
 use libconfig::Config;
 use libcortex_a9::l2c::enable_l2_cache;
-use libboard_artiq::{logger, identifier_read, pl};
+use libboard_artiq::{logger, identifier_read, pl, io_expander};
 
 const ASYNC_ERROR_COLLISION: u8 = 1 << 0;
 const ASYNC_ERROR_BUSY: u8 = 1 << 1;
@@ -46,8 +46,6 @@ mod mgmt;
 mod analyzer;
 mod irq;
 mod i2c;
-#[cfg(feature = "target_kasli_soc")]
-mod io_expander;
 
 static mut SEEN_ASYNC_ERRORS: u8 = 0;
 
@@ -117,21 +115,17 @@ pub fn main_core0() {
 
     #[cfg(feature = "target_kasli_soc")]
     {
-        let (mut io_expander0, mut io_expander1) = (io_expander::IoExpander::new(0).unwrap(), io_expander::IoExpander::new(1).unwrap());
-        io_expander0.init().expect("I2C I/O expander #0 initialization failed");
-        io_expander1.init().expect("I2C I/O expander #1 initialization failed");
-
-        // Actively drive TX_DISABLE to false on SFP0..3
-        io_expander0.set_oe(0, 1 << 1).unwrap();
-        io_expander0.set_oe(1, 1 << 1).unwrap();
-        io_expander1.set_oe(0, 1 << 1).unwrap();
-        io_expander1.set_oe(1, 1 << 1).unwrap();
-        io_expander0.set(0, 1, false);
-        io_expander0.set(1, 1, false);
-        io_expander1.set(0, 1, false);
-        io_expander1.set(1, 1, false);
-        io_expander0.service().unwrap();
-        io_expander1.service().unwrap();
+        let i2c = unsafe { (&mut i2c::I2C_BUS).as_mut().unwrap() };
+        for expander_i in 0..2 {
+            let mut io_expander = io_expander::IoExpander::new(i2c, expander_i).unwrap();
+            io_expander.init().expect("I2C I/O expander #0 initialization failed");
+            // Actively drive TX_DISABLE to false on SFP0..3
+            io_expander.set_oe(0, 1 << 1).unwrap();
+            io_expander.set_oe(1, 1 << 1).unwrap();
+            io_expander.set(0, 1, false);
+            io_expander.set(1, 1, false);
+            io_expander.service().unwrap();
+        }
     }
 
     let cfg = match Config::new() {

src/satman/src/main.rs

@@ -22,7 +22,7 @@ use libboard_zynq::{i2c::I2c, timer::GlobalTimer, time::Milliseconds, print, pri
 use libsupport_zynq::ram;
 #[cfg(has_si5324)]
 use libboard_artiq::si5324;
-use libboard_artiq::{pl::csr, drtio_routing, drtioaux, logger, identifier_read};
+use libboard_artiq::{pl::csr, drtio_routing, drtioaux, logger, identifier_read, io_expander};
 use libcortex_a9::{spin_lock_yield, interrupt_handler, regs::{MPIDR, SP}, notify_spin_lock, asm, l2c::enable_l2_cache};
 use libregister::{RegisterW, RegisterR};
 #[cfg(feature = "target_kasli_soc")]
@@ -449,6 +449,19 @@ pub extern fn main_core0() -> i32 {
 
     let mut i2c = I2c::i2c0();
     i2c.init().expect("I2C initialization failed");
+    #[cfg(feature = "target_kasli_soc")]
+    {
+        for expander_i in 0..2 {
+            let mut io_expander = io_expander::IoExpander::new(&mut i2c, expander_i).unwrap();
+            io_expander.init().expect("I2C I/O expander #0 initialization failed");
+            // Actively drive TX_DISABLE to false on SFP0..3
+            io_expander.set_oe(0, 1 << 1).unwrap();
+            io_expander.set_oe(1, 1 << 1).unwrap();
+            io_expander.set(0, 1, false);
+            io_expander.set(1, 1, false);
+            io_expander.service().unwrap();
+        }
+    }
 
     #[cfg(has_si5324)]
     si5324::setup(&mut i2c, &SI5324_SETTINGS, si5324::Input::Ckin1, &mut timer).expect("cannot initialize Si5324");