add Kasli I2C driver

artiq/coredevice/kasli_i2c.py

@@ -0,0 +1,73 @@
+from numpy import int32
+
+from artiq.experiment import *
+from artiq.coredevice.i2c import i2c_write_many, i2c_read_many, i2c_poll
+
+
+port_mapping = {
+    "EEM0": 7,
+    "EEM1": 5,
+    "EEM2": 4,
+    "EEM3": 3,
+    "EEM4": 2,
+    "EEM5": 1,
+    "EEM6": 0,
+    "EEM7": 6,
+    "EEM8": 12,
+    "EEM9": 13,
+    "EEM10": 15,
+    "EEM11": 14,
+    "SFP0": 8,
+    "SFP1": 9,
+    "SFP2": 10,
+    "LOC0": 11,
+}
+
+
+class KasliEEPROM:
+    def __init__(self, dmgr, port, busno=0,
+            core_device="core", sw0_device="i2c_switch0", sw1_device="i2c_switch1"):
+        self.core = dmgr.get(core_device)
+        self.sw0 = dmgr.get(sw0_device)
+        self.sw1 = dmgr.get(sw1_device)
+        self.busno = busno
+        self.port = port_mapping[port]
+        self.address = 0xa0  # i2c 8 bit
+
+    @kernel
+    def select(self):
+        mask = 1 << self.port
+        self.sw0.select(mask)
+        self.sw1.select(mask >> 8)
+
+    @kernel
+    def deselect(self):
+        self.sw0.select(0)
+        self.sw1.select(0)
+
+    @kernel
+    def write_i32(self, addr, value):
+        self.select()
+        try:
+            data = [0]*4
+            for i in range(4):
+                data[i] = (value >> 24) & 0xff
+                value <<= 8
+            i2c_write_many(self.busno, self.address, addr, data)
+            i2c_poll(self.busno, self.address)
+        finally:
+            self.deselect()
+
+    @kernel
+    def read_i32(self, addr):
+        self.select()
+        try:
+            data = [0]*4
+            i2c_read_many(self.busno, self.address, addr, data)
+            value = int32(0)
+            for i in range(4):
+                value <<= 8
+                value |= data[i]
+        finally:
+            self.deselect()
+        return value