src/pinmux_generator.py

   1 # ================================== Steps to add peripherals ============
   2 # Step-1:   create interface declaration for the peripheral to be added.
   3 #           Remember these are interfaces defined for the pinmux and hence
   4 #           will be opposite to those defined at the peripheral.
   5 #           For eg. the output TX from the UART will be input (method Action)
   6 #           for the pinmux.
   7 #           These changes will have to be done in interface_decl.py
   8 # Step-2    define the wires that will be required to transfer data from the
   9 #           peripheral interface to the IO cell and vice-versa. Create a
  10 #           mkDWire for each input/output between the peripheral and the
  11 #           pinmux. Also create an implicit wire of GenericIOType for each cell
  12 #           that can be connected to a each bit from the peripheral.
  13 #           These changes will have to be done in wire_def.py
  14 # Step-3:   create the definitions for each of the methods defined above.
  15 #           These changes will have to be done in interface_decl.py
  16 # ========================================================================
  17
  18 # default module imports
  19 import os
  20 import sys
  21 import time
  22 import math
  23
  24 # project module imports
  25 from interface_decl import *
  26 from interface_def import *
  27 from parse import *
  28 from wire_def import *
  29 from actual_pinmux import *
  30
  31 if not os.path.exists("bsv_src"):
  32     os.makedirs("bsv_src")
  33
  34 bsv_file = open("./bsv_src/pinmux.bsv", "w")
  35
  36
  37 header = '''
  38 /*
  39    This BSV file has been generated by the PinMux tool available at:
  40    https://bitbucket.org/casl/pinmux.
  41
  42    Authors: Neel Gala, Luke
  43    Date of generation: ''' + time.strftime("%c") + '''
  44 */
  45 package pinmux;
  46
  47    typedef struct{
  48       Bit#(1) outputval;      // output from core to pad                bit7
  49       Bit#(1) output_en;      // output enable from core to pad         bit6
  50       Bit#(1) input_en;       // input enable from core to io_cell      bit5
  51       Bit#(1) pullup_en;      // pullup enable from core to io_cell     bit4
  52       Bit#(1) pulldown_en;    // pulldown enable from core to io_cell   bit3
  53       Bit#(1) drivestrength;  // drivestrength from core to io_cell     bit2
  54       Bit#(1) pushpull_en;    // pushpull enable from core to io_cell   bit1
  55       Bit#(1) opendrain_en;   // opendrain enable form core to io_cell  bit0
  56    } GenericIOType deriving(Eq,Bits,FShow);
  57
  58    interface Ifc_pinmux;
  59 '''
  60 footer = '''
  61    endmodule
  62 endpackage
  63 '''
  64 # ============================================#
  65 # ==== populating the file with the code =====#
  66 # ============================================#
  67
  68 # package and interface declaration followed by the generic io_cell definition
  69 bsv_file.write(header)
  70
  71 bsv_file.write('''
  72
  73       // declare the method which will capture the user pin-mux
  74       // selection values.The width of the input is dependent on the number
  75       // of muxes happening per IO. For now we have a generalized width
  76       // where each IO will have the same number of muxes.''')
  77
  78 for cell in muxed_cells:
  79     bsv_file.write(mux_interface.format(cell[0],
  80                                         int(math.log(len(cell) - 1, 2))))
  81
  82 bsv_file.write('''
  83
  84       // declare the interface to the IO cells.
  85       // Each IO cell will have 8 input field (output from pin mux
  86       // and on output field (input to pinmux)''')
  87 for i in range(0, N_IO):
  88     bsv_file.write('''\n      // interface for IO CEll-{0}''')
  89     bsv_file.write(io_interface.format(i))
  90 # ==============================================================
  91
  92 # == create method definitions for all peripheral interfaces ==#
  93 for i in range(0, N_UART):
  94     bsv_file.write('''
  95       // interface declaration between UART-{0} and pinmux'''.format(i))
  96     bsv_file.write(uartinterface_decl.format(i))
  97
  98 for i in range(0, N_SPI):
  99     bsv_file.write('''
 100       // interface declaration between SPI-{0} and pinmux'''.format(i))
 101     bsv_file.write(spiinterface_decl.format(i))
 102
 103 for i in range(0, N_TWI):
 104     bsv_file.write('''
 105       // interface declaration between TWI-{0} and pinmux'''.format(i))
 106     bsv_file.write(twiinterface_decl.format(i))
 107 # ==============================================================
 108
 109 # ===== finish interface definition and start module definition=======
 110 bsv_file.write('''
 111    endinterface
 112    (*synthesize*)
 113    module mkpinmux(Ifc_pinmux);
 114 ''')
 115 # ====================================================================
 116
 117 # ======================= create wire and registers =================#
 118 bsv_file.write('''
 119       // the followins wires capture the pin-mux selection
 120       // values for each mux assigned to a CELL
 121 ''')
 122 for cell in muxed_cells:
 123     bsv_file.write(muxwire.format(cell[0], int(math.log(len(cell) - 1, 2))))
 124
 125
 126 bsv_file.write(
 127     '''\n      // following wires capture the values sent to the IO Cell''')
 128 for i in range(0, N_IO):
 129     bsv_file.write(generic_io.format(i))
 130
 131 for i in range(0, N_UART):
 132     bsv_file.write(
 133         '''\n      // following wires capture signals to IO CELL if uart-{0} is
 134       // allotted to it'''.format(i))
 135     bsv_file.write(uartwires.format(i))
 136
 137 for i in range(0, N_SPI):
 138     bsv_file.write(
 139         '''\n      // following wires capture signals to IO CELL if spi-{0} is
 140       // allotted to it'''.format(i))
 141     bsv_file.write(spiwires.format(i))
 142
 143 for i in range(0, N_TWI):
 144     bsv_file.write(
 145         '''\n      // following wires capture signals to IO CELL if twi-{0} is
 146       // allotted to it'''.format(i))
 147     bsv_file.write(twiwires.format(i))
 148 bsv_file.write("\n")
 149 # ====================================================================
 150 # ========================= Actual pinmuxing ========================#
 151 bsv_file.write('''
 152       /*====== This where the muxing starts for each io-cell======*/
 153 ''')
 154 bsv_file.write(pinmux)
 155 bsv_file.write('''
 156       /*============================================================*/
 157 ''')
 158 # ====================================================================
 159 # ================= interface definitions for each method =============#
 160 for cell in muxed_cells:
 161     bsv_file.write(mux_interface_def.format(cell[0],
 162                                             int(math.log(len(cell) - 1, 2))))
 163 for i in range(0, N_IO):
 164     bsv_file.write(io_interface_def.format(i))
 165 for i in range(0, N_UART):
 166     bsv_file.write(uartinterface_def.format(i))
 167 for i in range(0, N_SPI):
 168     bsv_file.write(spiinterface_def.format(i))
 169 for i in range(0, N_TWI):
 170     bsv_file.write(twiinterface_def.format(i))
 171 bsv_file.write(footer)
 172 print("BSV file successfully generated: bsv_src/pinmux.bsv")
 173 # ======================================================================
 174 bsv_file.close()