From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Thu, 26 Jun 2014 08:44:26 +0000 (+0200)
Subject: cpuif: remove limitations on csr data_width
X-Git-Tag: 24jan2021_ls180~2699^2
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d4833cb3dc7a747fc30a0f45bab3390a020e04bc;p=litex.git

cpuif: remove limitations on csr data_width
---

diff --git a/misoclib/gensoc/cpuif.py b/misoclib/gensoc/cpuif.py
index 82d5cdbc..2646711d 100644
--- a/misoclib/gensoc/cpuif.py
+++ b/misoclib/gensoc/cpuif.py
@@ -1,3 +1,4 @@
+from migen.fhdl.std import *
 from migen.bank.description import CSRStatus
 
 def get_cpu_mak(cpu_type):
@@ -28,19 +29,20 @@ def get_mem_header(regions, flash_boot_address):
 	r += "#endif\n"
 	return r
 
-def _get_rw_functions(reg_name, reg_base, size, read_only):
+def _get_rw_functions(reg_name, reg_base, nwords, busword, read_only):
 	r = ""
 
 	r += "#define CSR_"+reg_name.upper()+"_ADDR "+hex(reg_base)+"\n"
-	r += "#define CSR_"+reg_name.upper()+"_SIZE "+str(size)+"\n"
+	r += "#define CSR_"+reg_name.upper()+"_SIZE "+str(nwords)+"\n"
 
-	if size > 8:
+	size = nwords*busword
+	if size > 64:
 		raise NotImplementedError("Register too large")
-	elif size > 4:
+	elif size > 32:
 		ctype = "unsigned long long int"
-	elif size > 2:
+	elif size > 16:
 		ctype = "unsigned int"
-	elif size > 1:
+	elif size > 8:
 		ctype = "unsigned short int"
 	else:
 		ctype = "unsigned char"
@@ -48,21 +50,21 @@ def _get_rw_functions(reg_name, reg_base, size, read_only):
 	r += "static inline "+ctype+" "+reg_name+"_read(void) {\n"
 	if size > 1:
 		r += "\t"+ctype+" r = MMPTR("+hex(reg_base)+");\n"
-		for byte in range(1, size):
-			r += "\tr <<= 8;\n\tr |= MMPTR("+hex(reg_base+4*byte)+");\n"
+		for byte in range(1, nwords):
+			r += "\tr <<= "+str(busword)+";\n\tr |= MMPTR("+hex(reg_base+4*byte)+");\n"
 		r += "\treturn r;\n}\n"
 	else:
 		r += "\treturn MMPTR("+hex(reg_base)+");\n}\n"
 
 	if not read_only:
 		r += "static inline void "+reg_name+"_write("+ctype+" value) {\n"
-		for byte in range(size):
-			shift = (size-byte-1)*8
+		for word in range(nwords):
+			shift = (nwords-word-1)*busword
 			if shift:
 				value_shifted = "value >> "+str(shift)
 			else:
 				value_shifted = "value"
-			r += "\tMMPTR("+hex(reg_base+4*byte)+") = "+value_shifted+";\n"
+			r += "\tMMPTR("+hex(reg_base+4*word)+") = "+value_shifted+";\n"
 		r += "}\n"
 	return r
 
@@ -72,9 +74,10 @@ def get_csr_header(csr_base, bank_array, interrupt_map):
 		r += "\n/* "+name+" */\n"
 		reg_base = csr_base + 0x800*mapaddr
 		r += "#define "+name.upper()+"_BASE "+hex(reg_base)+"\n"
+		busword = flen(rmap.bus.dat_w)
 		for csr in csrs:
-			nr = (csr.size + 7)//8
-			r += _get_rw_functions(name + "_" + csr.name, reg_base, nr, isinstance(csr, CSRStatus))
+			nr = (csr.size + busword - 1)//busword
+			r += _get_rw_functions(name + "_" + csr.name, reg_base, nr, busword, isinstance(csr, CSRStatus))
 			reg_base += 4*nr
 		try:
 			interrupt_nr = interrupt_map[name]
@@ -93,8 +96,9 @@ def get_csr_csv(csr_base, bank_array):
 	r = ""
 	for name, csrs, mapaddr, rmap in bank_array.banks:
 		reg_base = csr_base + 0x800*mapaddr
+		busword = flen(rmap.bus.dat_w)
 		for csr in csrs:
-			nr = (csr.size + 7)//8
+			nr = (csr.size + busword - 1)//busword
 			r += "{}_{},0x{:08x},{},{}\n".format(name, csr.name, reg_base, nr, "ro" if isinstance(csr, CSRStatus) else "rw")
 			reg_base += 4*nr
 	return r