adding support for interface of SD/MMC.

[pinmux.git] / src / actual_pinmux.py

diff --git a/src/actual_pinmux.py b/src/actual_pinmux.py
index 944a8161d03e38de3359c25f925d287aa6a0a682..2c1d76f1584282269ac59ff0e9ef5f9571728dc6 100644 (file)
--- a/src/actual_pinmux.py
+++ b/src/actual_pinmux.py
@@ -1,17 +1,89 @@
-from params import *
-#== Actual pinmuxing ==# TODO: Need to get this as a templete
-pinmux='''
-               /*=============== THIS IS WHERE ACTUAL MUXING HAPPENS ==========*/
-               cell0_out=wrmux0==0?uart0_rx_io:uart1_rx_io;
-               rule get_input_for_rx;
-                       if(wrmux0==0)
-                               wruart0_rx<=cell0_in;
-                       else
-                               wruart1_rx<=cell0_in;
-               endrule
-               cell1_out=wrmux1==0?uart0_tx_io:uart1_tx_io;
-               /*==============================================================*/
+from parse import *
+from string import digits
+
+
+# dictionary of properties of signals that are supported.
+dictionary = {
+    "uart_rx"  : "input",
+    "uart_tx"  : "output",
+    "spi_sclk" : "output",
+    "spi_mosi" : "output",
+    "spi_ss"   : "output",
+    "spi_miso" : "input",
+    "twi_sda"  : "inout",
+    "twi_scl"  : "inout",
+    "sd_clk": "output",
+    "sd_cmd": "output",
+    "sd_d": "inout",
+}
+
+
+# ============== common bsv templates ============ #
+# first argument is the io-cell number being assigned.
+# second argument is the mux value.
+# Third argument is the signal from the pinmap file
+mux_wire = '''
+      rule assign_{2}_on_cell{0}(wrmux{0}=={1});
+        {2}<=cell{0}_in;
+      endrule
+'''
+dedicated_wire = '''
+      rule assign_{1}_on_cell{0};
+        {1}<=cell{0}_in;
+      endrule
 '''
-########################################################################
+# ============================================================
+pinmux = ''' '''
+digits = str.maketrans(dict.fromkeys('0123456789'))
+
+for cell in muxed_cells:
+    pinmux = pinmux + "      cell" + str(cell[0]) + "_out="
+    i = 0
+    while(i < len(cell) - 1):
+        pinmux = pinmux + "wrmux" + \
+            str(cell[0]) + "==" + str(i) + "?" + cell[i + 1] + "_io:"
+        if(i + 2 == len(cell) - 1):
+            pinmux = pinmux + cell[i + 2] + "_io"
+            i = i + 2
+        else:
+            i = i + 1
+    pinmux = pinmux + ";\n"
+    # ======================================================== #
 
+    # check each cell if "peripheral input/inout" then assign its wire
+    # Here we check the direction of each signal in the dictionary.
+    # We choose to keep the dictionary within the code and not user-input
+    # since the interfaces are always standard and cannot change from
+    # user-to-user. Plus this also reduces human-error as well :)
+    for i in range(0, len(cell) - 1):
+        temp = cell[i + 1].translate(digits)
+        x = dictionary.get(temp)
+        if(x is None):
+            print(
+              "ERROR: The signal : " +
+              str(cell[i + 1]) +
+              " of pinmap.txt isn't present in the current dictionary.\
+              \nUpdate dictionary or fix-typo.")
+            exit(1)
+        if(x == "input"):
+            pinmux = pinmux + \
+              mux_wire.format(cell[0], i, "wr" + cell[i + 1]) + "\n"
+        elif(x == "inout"):
+            pinmux = pinmux + \
+                mux_wire.format(cell[0], i, "wr" + cell[i + 1] +
+                                            "_in") + "\n"
+# ============================================================ #
 
+# ==================  Logic for dedicated pins ========= #
+for cell in dedicated_cells:
+    pinmux = pinmux + "      cell" + \
+        str(cell[0]) + "_out=" + cell[1] + "_io;\n"
+    temp = cell[1].translate(digits)
+    x = dictionary.get(temp)
+    if(x == "input"):
+        pinmux = pinmux + \
+            dedicated_wire.format(cell[0], "wr" + cell[1]) + "\n"
+    elif(x == "inout"):
+        pinmux = pinmux + \
+            dedicated_wire.format(cell[0], "wr" + cell[1] + "_in") + "\n"
+# =======================================================#