Add i2c support

src/gateware/ebaz4205.py

@@ -73,9 +73,19 @@ _ddr = [
     )
 ]
 
+# Connector J3
+_i2c = [
+    (
+        "i2c",
+        0,
+        Subsignal("scl", Pins("U12"), IOStandard("LVCMOS33")),
+        Subsignal("sda", Pins("V13"), IOStandard("LVCMOS33")),
+    )
+]
+
 
 class EBAZ4205(SoCCore):
-    def __init__(self, rtio_clk=100e6, acpki=False):
+    def __init__(self, rtio_clk=125e6, acpki=False):
         self.acpki = acpki
 
         platform = ebaz4205.Platform()
@@ -86,6 +96,7 @@ class EBAZ4205(SoCCore):
         )
         platform.add_extension(_ps)
         platform.add_extension(_ddr)
+        platform.add_extension(_i2c)
 
         gmii = platform.request("gmii")
         platform.add_period_constraint(gmii.rx_clk, 10)
@@ -97,12 +108,7 @@ class EBAZ4205(SoCCore):
         ident = self.__class__.__name__
         if self.acpki:
             ident = "acpki_" + ident
-        SoCCore.__init__(
-            self,
-            platform=platform,
-            csr_data_width=32,
-            ident=ident,
-        )
+        SoCCore.__init__(self, platform=platform, csr_data_width=32, ident=ident)
         fix_serdes_timing_path(platform)
         self.config["RTIO_FREQUENCY"] = str(rtio_clk / 1e6)
         platform.add_period_constraint(self.ps7.cd_sys.clk, 10)
@@ -128,21 +134,34 @@ class EBAZ4205(SoCCore):
 
         # MDIO
         mdio = platform.request("mdio")
-        self.comb += [
-            mdio.mdc.eq(self.ps7.enet0.enet.mdio.mdc),
-        ]
-
-        mdio_t = Signal()
-        self.comb += mdio_t.eq(~self.ps7.enet0.enet.mdio.t_n)
-
-        self.specials += [
-            Instance(
+        self.comb += mdio.mdc.eq(self.ps7.enet0.enet.mdio.mdc)
+        self.specials += Instance(
             "IOBUF",
             i_I=self.ps7.enet0.enet.mdio.o,
             io_IO=mdio.mdio,
             o_O=self.ps7.enet0.enet.mdio.i,
-                i_T=mdio_t,
+            i_T=~self.ps7.enet0.enet.mdio.t_n,
         )
+
+        # I2C
+        i2c = self.platform.request("i2c")
+        self.specials += [
+            # SCL
+            Instance(
+                "IOBUF",
+                i_I=self.ps7.i2c0.scl.o,
+                io_IO=i2c.scl,
+                o_O=self.ps7.i2c0.scl.i,
+                i_T=~self.ps7.i2c0.scl.t_n,
+            ),
+            # SDA
+            Instance(
+                "IOBUF",
+                i_I=self.ps7.i2c0.sda.o,
+                io_IO=i2c.sda,
+                o_O=self.ps7.i2c0.sda.i,
+                i_T=~self.ps7.i2c0.sda.t_n,
+            ),
         ]
 
         self.rtio_channels = []
@@ -211,7 +230,7 @@ def main():
     parser.add_argument(
         "-g", default=None, help="build gateware into the specified directory"
     )
-    parser.add_argument("--rtio_clk", default=100e6, help="RTIO Clock Frequency (Hz)")
+    parser.add_argument("--rtio-clk", default=125e6, help="RTIO Clock Frequency (Hz)")
     parser.add_argument(
         "--acpki", default=False, action="store_true", help="enable ACPKI"
     )

src/libksupport/src/kernel/api.rs

@@ -11,9 +11,7 @@ use super::{cache,
             core1::rtio_get_destination_status,
             dma, linalg,
             rpc::{rpc_recv, rpc_send, rpc_send_async}};
-use crate::{eh_artiq, rtio};
-#[cfg(not(feature = "target_ebaz4205"))]
-use crate::i2c;
+use crate::{eh_artiq, i2c, rtio};
 
 extern "C" {
     fn vsnprintf_(buffer: *mut c_char, count: size_t, format: *const c_char, va: VaList) -> c_int;
@@ -111,17 +109,11 @@ pub fn resolve(required: &[u8]) -> Option<u32> {
         api!(cache_put = cache::put),
 
         // i2c
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_start = i2c::start),
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_restart = i2c::restart),
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_stop = i2c::stop),
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_write = i2c::write),
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_read = i2c::read),
-        #[cfg(not(feature = "target_ebaz4205"))]
         api!(i2c_switch_select = i2c::switch_select),
 
         // subkernel

src/libksupport/src/lib.rs

@@ -21,7 +21,6 @@ pub use pl::csr::rtio_core;
 use void::Void;
 
 pub mod eh_artiq;
-#[cfg(not(feature = "target_ebaz4205"))]
 pub mod i2c;
 pub mod irq;
 pub mod kernel;

src/runtime/src/main.rs

@@ -100,7 +100,6 @@ pub fn main_core0() {
 
     info!("gateware ident: {}", identifier_read(&mut [0; 64]));
 
-    #[cfg(not(feature = "target_ebaz4205"))]
     ksupport::i2c::init();
     #[cfg(feature = "target_kasli_soc")]
     {

src/runtime/src/rtio_clocking.rs

@@ -1,6 +1,8 @@
+#[cfg(not(feature = "target_ebaz4205"))]
 use embedded_hal::blocking::delay::DelayMs;
 #[cfg(has_si5324)]
 use ksupport::i2c;
+#[cfg(not(feature = "target_ebaz4205"))]
 use libboard_artiq::pl;
 #[cfg(has_si5324)]
 use libboard_artiq::si5324;
@@ -10,7 +12,9 @@ use libboard_artiq::si549;
 use libboard_zynq::i2c::I2c;
 use libboard_zynq::timer::GlobalTimer;
 use libconfig::Config;
-use log::{info, warn};
+use log::warn;
+#[cfg(not(feature = "target_ebaz4205"))]
+use log::info;
 
 #[derive(Debug, PartialEq, Copy, Clone)]
 #[allow(non_camel_case_types)]