From: Luke Kenneth Casson Leighton Date: Wed, 1 Aug 2018 10:19:30 +0000 (+0100) Subject: AddingPeripherals.mdwn X-Git-Url: https://git.libre-soc.org/?p=pinmux.git;a=commitdiff_plain;h=f04f479c60c747ae9062bbd17aa92fa8002d0732 AddingPeripherals.mdwn --- diff --git a/docs/AddingPeripherals.mdwn b/docs/AddingPeripherals.mdwn index e1b470d..7f2faa5 100644 --- a/docs/AddingPeripherals.mdwn +++ b/docs/AddingPeripherals.mdwn @@ -326,6 +326,8 @@ is directly connected to the relevant IO pad cells, so that the *actual* peripheral may be declared in the "fast" fabric and connected up to the relevant and required "fast" bus. +## Connecting in the fabric + Now we can begin the process of systematically inserting the correct "voodoo magic" incantations that, as far as this auto-generator tool is concerned, are just bits of ASCII text. In this particular instance, an @@ -509,4 +511,78 @@ class sdram(PBase): return [0x400000, # defines an entire memory range (hack...) 12] # defines the number of configuration regs - +So after running the autogenerator again, to confirm that this has +generated the correct code, we examine several files, starting with +fast\+memory\_map.bsv: + + /*====== Fast peripherals Memory Map ======= */ + `define SDR0_0_Base 'h50000000 + `define SDR0_0_End 'h5FFFFFFF // 4194304 32-bit regs + `define SDR0_1_Base 'h60000000 + `define SDR0_1_End 'h600002FF // 12 32-bit regs + +This looks slightly awkward (and in need of an external specification +section for addresses) but is fine: the range is 1GB for the main +map and covers 12 32-bit registers for the SDR Config map. +Next we note the slave numbering: + + typedef 0 SDR0_0__fastslave_num; + typedef 1 SDR0_1__fastslave_num; + typedef 2 FB0_fastslave_num; + typedef 3 LCD0_fastslave_num; + typedef 3 LastGen_fastslave_num; + typedef TAdd#(LastGen_fastslave_num,1) Sdram_slave_num; + typedef TAdd#(Sdram_slave_num ,`ifdef SDRAM 1 `else 0 `endif ) + Sdram_cfg_slave_num; + +Again this looks reasonable and we may subsequently (carefully! noting +the use of the TAdd# chain!) remove the #define for Sdram\_cfg\_slave\_num. +The next phase is to examine the fn\_addr\_to\_fastslave\_num function, +where we note that there were *two* hand-created sections previously, +now joined by two *auto-generated* sections: + + function Tuple2 #(Bool, Bit#(TLog#(Num_Fast_Slaves))) + fn_addr_to_fastslave_num (Bit#(`PADDR) addr); + + if(addr>=`SDRAMMemBase && addr<=`SDRAMMemEnd) + return tuple2(True,fromInteger(valueOf(Sdram_slave_num))); <-- + else if(addr>=`DebugBase && addr<=`DebugEnd) + return tuple2(True,fromInteger(valueOf(Debug_slave_num))); <-- + `ifdef SDRAM + else if(addr>=`SDRAMCfgBase && addr<=`SDRAMCfgEnd ) + return tuple2(True,fromInteger(valueOf(Sdram_cfg_slave_num))); + `endif + + ... + ... + if(addr>=`SDR0_0_Base && addr<=`SDR0_0_End) <-- + return tuple2(True,fromInteger(valueOf(SDR0_0__fastslave_num))); + else + if(addr>=`SDR0_1_Base && addr<=`SDR0_1_End) <-- + return tuple2(True,fromInteger(valueOf(SDR0_1__fastslave_num))); + else + if(addr>=`FB0Base && addr<=`FB0End) + +Now, here is where, in a slightly unusual unique set of circumstances, we +cannot just remove all instances of this address / typedef from the template +code. Looking in the shakti-core repository's src/lib/MemoryMap.bsv file, +the SDRAMMemBase macro is utilise in the is\_IO\_Addr function. So as a +really bad hack, which will need to be properly resolved, whilst the +hand-generated sections from fast\_tuple2\_template.bsv are removed, +and the corresponding (now redundant) defines in src/core/core\_parameters.bsv +are commented out, some temporary typedefs to deal with the name change are +also added: + + `define SDRAMMemBase SDR0_0_Base + `define SDRAMMemEnd SDR0_0_End + +This needs to be addressed (pun intended) including being able to specify +the name(s) of the configuration parameters, as well as specifying which +memory map range they must be added to. + +Now however finally, after carefully comparing the hard-coded fabric +connections to what was formerly named sdram, we may remove the mkConnections +that drop sdram.axi4\_slave\_sdram and its associated cntrl reg from +the soc\_template.bsv file. + +## Connecting up the pins diff --git a/src/bsv/bsv_lib/fast_tuple2_template.bsv b/src/bsv/bsv_lib/fast_tuple2_template.bsv index 82357cf..04d1007 100644 --- a/src/bsv/bsv_lib/fast_tuple2_template.bsv +++ b/src/bsv/bsv_lib/fast_tuple2_template.bsv @@ -43,18 +43,15 @@ package fast_memory_map; {2} +`define SDRAMMemBase SDR0_0_Base +`define SDRAMMemEnd SDR0_0_End + function Tuple2 #(Bool, Bit#(TLog#(Num_Fast_Slaves))) fn_addr_to_fastslave_num (Bit#(`PADDR) addr); - if(addr>=`SDRAMMemBase && addr<=`SDRAMMemEnd) - return tuple2(True,fromInteger(valueOf(Sdram_slave_num))); - else if(addr>=`DebugBase && addr<=`DebugEnd) + if(addr>=`DebugBase && addr<=`DebugEnd) return tuple2(True,fromInteger(valueOf(Debug_slave_num))); - `ifdef SDRAM - else if(addr>=`SDRAMCfgBase && addr<=`SDRAMCfgEnd ) - return tuple2(True,fromInteger(valueOf(Sdram_cfg_slave_num))); - `endif `ifdef BOOTROM else if(addr>=`BootRomBase && addr<=`BootRomEnd) return tuple2(True,fromInteger(valueOf(BootRom_slave_num))); diff --git a/src/bsv/bsv_lib/soc_template.bsv b/src/bsv/bsv_lib/soc_template.bsv index 285ef0f..342a21d 100644 --- a/src/bsv/bsv_lib/soc_template.bsv +++ b/src/bsv/bsv_lib/soc_template.bsv @@ -172,14 +172,6 @@ package socgen; [fromInteger(valueOf(Debug_slave_num))], core.debug_slave); `endif - `ifdef SDRAM - mkConnection (fabric.v_to_slaves - [fromInteger(valueOf(Sdram_slave_num))], - sdram.axi4_slave_sdram); // - mkConnection (fabric.v_to_slaves - [fromInteger(valueOf(Sdram_cfg_slave_num))], - sdram.axi4_slave_cntrl_reg); // - `endif `ifdef BRAM mkConnection(fabric.v_to_slaves [fromInteger(valueOf(Sdram_slave_num))], diff --git a/src/bsv/peripheral_gen/base.py b/src/bsv/peripheral_gen/base.py index 074a7c6..fd5ef04 100644 --- a/src/bsv/peripheral_gen/base.py +++ b/src/bsv/peripheral_gen/base.py @@ -147,7 +147,7 @@ class PBase(object): res = [] for (i, nregs) in enumerate(offs): if len(offs) == 1: - idx_ = i + idx_ = "" else: idx_ = "_%d_" % i name_ = self.axi_slave_name(idx_, name, ifacenum, typ) @@ -416,6 +416,10 @@ Ifc_sync#({0}) {1}_sync <-mksyncconnection( if not isinstance(connections, list): connections = [connections] for (idx, con) in enumerate(connections): + if len(connections) == 1: + idx = "" + else: + idx = "_%d_" % idx aname = self.axi_slave_name(idx, name, count, typ) ret.append(self.__mk_connection(con, aname, count, fabricname)) return '\n'.join(ret)