5957ad882b125378d5de86568dafa1ec0077a7c4
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)
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 # ========================================================================
18 # default module imports
24 # project module imports
25 from interface_decl
import Interfaces
, mux_interface
, io_interface
26 from parse
import Parse
27 from actual_pinmux
import init
28 from bus_transactors
import axi4_lite
32 This BSV file has been generated by the PinMux tool available at:
33 https://bitbucket.org/casl/pinmux.
35 Authors: Neel Gala, Luke
36 Date of generation: ''' + time
.strftime("%c") + '''
39 header
= copyright
+ '''
43 Bit#(1) outputval; // output from core to pad bit7
44 Bit#(1) output_en; // output enable from core to pad bit6
45 Bit#(1) input_en; // input enable from core to io_cell bit5
46 Bit#(1) pullup_en; // pullup enable from core to io_cell bit4
47 Bit#(1) pulldown_en; // pulldown enable from core to io_cell bit3
48 Bit#(1) drivestrength; // drivestrength from core to io_cell bit2
49 Bit#(1) pushpull_en; // pushpull enable from core to io_cell bit1
50 Bit#(1) opendrain_en; // opendrain enable form core to io_cell bit0
51 } GenericIOType deriving(Eq,Bits,FShow);
61 def pinmuxgen(pth
=None, verify
=True):
62 """ populating the file with the code
65 p
= Parse(pth
, verify
)
67 ifaces
= Interfaces(pth
)
68 ifaces
.ifaceadd('io', p
.N_IO
, io_interface
, 0)
72 bp
= os
.path
.join(pth
, bp
)
73 if not os
.path
.exists(bp
):
76 pmp
= os
.path
.join(bp
, 'pinmux.bsv')
77 ptp
= os
.path
.join(bp
, 'PinTop.bsv')
78 bvp
= os
.path
.join(bp
, 'bus.bsv')
80 # package and interface declaration followed by
81 # the generic io_cell definition
82 with
open(pmp
, "w") as bsv_file
:
83 bsv_file
.write(header
)
86 interface MuxSelectionLines;
88 // declare the method which will capture the user pin-mux
89 // selection values.The width of the input is dependent on the number
90 // of muxes happening per IO. For now we have a generalized width
91 // where each IO will have the same number of muxes.''')
93 for cell
in p
.muxed_cells
:
94 cnum
= int(math
.log(len(cell
) - 1, 2))
95 bsv_file
.write(mux_interface
.ifacefmt(cell
[0], cnum
))
100 interface PeripheralSide;
101 // declare the interface to the IO cells.
102 // Each IO cell will have 8 input field (output from pin mux
103 // and on output field (input to pinmux)''')
104 # ==============================================================
106 # == create method definitions for all peripheral interfaces ==#
107 ifaces
.ifacefmt(bsv_file
)
109 # ==============================================================
111 # ===== finish interface definition and start module definition=======
115 interface Ifc_pinmux;
116 interface MuxSelectionLines mux_lines;
117 interface PeripheralSide peripheral_side;
120 module mkpinmux(Ifc_pinmux);
122 # ====================================================================
124 # ======================= create wire and registers =================#
126 // the followins wires capture the pin-mux selection
127 // values for each mux assigned to a CELL
129 for cell
in p
.muxed_cells
:
130 bsv_file
.write(mux_interface
.wirefmt(
131 cell
[0], int(math
.log(len(cell
) - 1, 2))))
133 ifaces
.wirefmt(bsv_file
)
136 # ====================================================================
137 # ========================= Actual pinmuxing ========================#
139 /*====== This where the muxing starts for each io-cell======*/
141 bsv_file
.write(p
.pinmux
)
143 /*============================================================*/
145 # ====================================================================
146 # ================= interface definitions for each method =============#
148 interface mux_lines = interface MuxSelectionLines
150 for cell
in p
.muxed_cells
:
151 bsv_file
.write(mux_interface
.ifacedef(cell
[0],
152 int(math
.log(len(cell
) - 1, 2))))
155 interface peripheral_side = interface PeripheralSide
157 ifaces
.ifacedef(bsv_file
)
158 bsv_file
.write(footer
)
159 print("BSV file successfully generated: bsv_src/pinmux.bsv")
160 # ======================================================================
162 with
open(ptp
, 'w') as bsv_file
:
163 bsv_file
.write(copyright
+ '''
166 interface Ifc_PintTop;
167 method ActionValue#(Bool) write(Bit#({0}) addr, Bit#({1}) data);
168 method Tuple2#(Bool,Bit#({1})) read(Bit#({0}) addr);
169 interface PeripheralSide peripheral_side;
172 module mkPinTop(Ifc_PintTop);
173 // instantiate the pin-mux module here
174 Ifc_pinmux pinmux <-mkpinmux;
176 // declare the registers which will be used to mux the IOs
177 '''.format(p
.ADDR_WIDTH
, p
.DATA_WIDTH
))
179 for cell
in p
.muxed_cells
:
181 Reg#(Bit#({0})) rg_muxio_{1} <-mkReg(0);'''.format(
182 int(math
.log(len(cell
) - 1, 2)), cell
[0]))
185 // rule to connect the registers to the selection lines of the
187 rule connect_selection_registers;''')
189 for cell
in p
.muxed_cells
:
191 pinmux.mux_lines.cell{0}_mux(rg_muxio_{0});'''.format(cell
[0]))
195 // method definitions for the write user interface
196 method ActionValue#(Bool) write(Bit#({2}) addr, Bit#({3}) data);
198 case (addr[{0}:{1}])'''.format(p
.upper_offset
, p
.lower_offset
,
199 p
.ADDR_WIDTH
, p
.DATA_WIDTH
))
201 for cell
in p
.muxed_cells
:
203 {0}: rg_muxio_{1}<=truncate(data);'''.format(index
, cell
[0]))
213 // method definitions for the read user interface
214 method Tuple2#(Bool,Bit#({3})) read(Bit#({2}) addr);
217 case (addr[{0}:{1}])'''.format(p
.upper_offset
, p
.lower_offset
,
218 p
.ADDR_WIDTH
, p
.DATA_WIDTH
))
220 for cell
in p
.muxed_cells
:
222 {0}: data=zeroExtend(rg_muxio_{1});'''.format(index
, cell
[0]))
228 return tuple2(err,data);
230 interface peripheral_side=pinmux.peripheral_side;
235 # ######## Generate bus transactors ################
236 with
open(bvp
, 'w') as bsv_file
:
237 bsv_file
.write(axi4_lite
.format(p
.ADDR_WIDTH
, p
.DATA_WIDTH
))
238 # ##################################################