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Make wishbone addresses be in units of doublewords or words

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This makes the 64-bit wishbone buses have the address expressed in
units of doublewords (64 bits), and similarly for the 32-bit buses the
address is in units of words (32 bits).  This is to comply with the
wishbone spec.  Previously the addresses on the wishbone buses were in
units of bytes regardless of the bus data width, which is not correct
and caused problems with interfacing with externally-generated logic.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
icbi-issue
Paul Mackerras 3 years ago
parent bb5f356386
commit ca4eb46aea
21 changed files with 118 additions and 106 deletions
Show Stats Download Patch File Download Diff File

16
dcache.vhdl
Unescape Escape View File

@ -456,7 +456,7 @@ architecture rtl of dcache is
-- Returns whether this is the last row of a line
function is_last_row_addr(addr: wishbone_addr_type; last: row_in_line_t) return boolean is
begin
return unsigned(addr(LINE_OFF_BITS-1 downto ROW_OFF_BITS)) = last;
return unsigned(addr(LINE_OFF_BITS - ROW_OFF_BITS - 1 downto 0)) = last;
end;

-- Returns whether this is the last row of a line
@ -471,10 +471,10 @@ architecture rtl of dcache is
variable result : wishbone_addr_type;
begin
-- Is there no simpler way in VHDL to generate that 3 bits adder ?
row_idx := addr(LINE_OFF_BITS-1 downto ROW_OFF_BITS);
row_idx := addr(ROW_LINEBITS - 1 downto 0);
row_idx := std_ulogic_vector(unsigned(row_idx) + 1);
result := addr;
result(LINE_OFF_BITS-1 downto ROW_OFF_BITS) := row_idx;
result(ROW_LINEBITS - 1 downto 0) := row_idx;
return result;
end;

@ -807,7 +807,7 @@ begin
begin
if rising_edge(clk) then
addr := (others => '0');
addr(snoop_in.adr'left downto 0) := snoop_in.adr;
addr(snoop_in.adr'left + ROW_OFF_BITS downto ROW_OFF_BITS) := snoop_in.adr;
snoop_tag_set <= cache_tags(get_index(addr));
snoop_wrtag <= get_tag(addr);
snoop_index <= get_index(addr);
@ -1383,7 +1383,7 @@ begin
-- Main state machine
case r1.state is
when IDLE =>
r1.wb.adr <= req.real_addr(r1.wb.adr'left downto 0);
r1.wb.adr <= req.real_addr(r1.wb.adr'left + ROW_OFF_BITS downto ROW_OFF_BITS);
r1.wb.sel <= req.byte_sel;
r1.wb.dat <= req.data;
r1.dcbz <= req.dcbz;
@ -1532,8 +1532,8 @@ begin
-- See if there is another store waiting to be done
-- which is in the same real page.
if req.valid = '1' then
r1.wb.adr(SET_SIZE_BITS - 1 downto 0) <=
req.real_addr(SET_SIZE_BITS - 1 downto 0);
r1.wb.adr(SET_SIZE_BITS - ROW_OFF_BITS - 1 downto 0) <=
req.real_addr(SET_SIZE_BITS - 1 downto ROW_OFF_BITS);
r1.wb.dat <= req.data;
r1.wb.sel <= req.byte_sel;
end if;
@ -1598,7 +1598,7 @@ begin
dcache_log: process(clk)
begin
if rising_edge(clk) then
log_data <= r1.wb.adr(5 downto 3) &
log_data <= r1.wb.adr(2 downto 0) &
wishbone_in.stall &
wishbone_in.ack &
r1.wb.stb & r1.wb.cyc &

48
dram_tb.vhdl
Unescape Escape View File

@ -250,10 +250,10 @@ begin
report "Back to back 4 stores 4 reads on hit...";
clr_acks;
for i in 0 to 3 loop
wb_write(add_off(a, i*8), make_pattern(i), x"ff");
wb_write(add_off(a, i), make_pattern(i), x"ff");
end loop;
for i in 0 to 3 loop
wb_read(add_off(a, i*8));
wb_read(add_off(a, i));
end loop;
wait_acks(8);
for i in 0 to 7 loop
@ -268,10 +268,10 @@ begin
a(10) := '1';
clr_acks;
for i in 0 to 3 loop
wb_write(add_off(a, i*8), make_pattern(i), x"ff");
wb_write(add_off(a, i), make_pattern(i), x"ff");
end loop;
for i in 0 to 3 loop
wb_read(add_off(a, i*8));
wb_read(add_off(a, i));
end loop;
wait_acks(8);
for i in 0 to 7 loop
@ -286,8 +286,8 @@ begin
a(10) := '1';
clr_acks;
for i in 0 to 3 loop
wb_write(add_off(a, i*8), make_pattern(i), x"ff");
wb_read(add_off(a, i*8));
wb_write(add_off(a, i), make_pattern(i), x"ff");
wb_read(add_off(a, i));
end loop;
wait_acks(8);
for i in 0 to 3 loop
@ -299,29 +299,29 @@ begin
a(11) := '1';
clr_acks;
wb_write(add_off(a, 0), x"1111111100000000", x"ff");
wb_write(add_off(a, 8), x"3333333322222222", x"ff");
wb_write(add_off(a, 16), x"5555555544444444", x"ff");
wb_write(add_off(a, 24), x"7777777766666666", x"ff");
wb_write(add_off(a, 32), x"9999999988888888", x"ff");
wb_write(add_off(a, 40), x"bbbbbbbbaaaaaaaa", x"ff");
wb_write(add_off(a, 48), x"ddddddddcccccccc", x"ff");
wb_write(add_off(a, 56), x"ffffffffeeeeeeee", x"ff");
wb_write(add_off(a, 64), x"1111111100000000", x"ff");
wb_write(add_off(a, 72), x"3333333322222222", x"ff");
wb_write(add_off(a, 80), x"5555555544444444", x"ff");
wb_write(add_off(a, 88), x"7777777766666666", x"ff");
wb_write(add_off(a, 96), x"9999999988888888", x"ff");
wb_write(add_off(a,104), x"bbbbbbbbaaaaaaaa", x"ff");
wb_write(add_off(a,112), x"ddddddddcccccccc", x"ff");
wb_write(add_off(a,120), x"ffffffffeeeeeeee", x"ff");
wb_write(add_off(a, 1), x"3333333322222222", x"ff");
wb_write(add_off(a, 2), x"5555555544444444", x"ff");
wb_write(add_off(a, 3), x"7777777766666666", x"ff");
wb_write(add_off(a, 4), x"9999999988888888", x"ff");
wb_write(add_off(a, 5), x"bbbbbbbbaaaaaaaa", x"ff");
wb_write(add_off(a, 6), x"ddddddddcccccccc", x"ff");
wb_write(add_off(a, 7), x"ffffffffeeeeeeee", x"ff");
wb_write(add_off(a, 8), x"1111111100000000", x"ff");
wb_write(add_off(a, 9), x"3333333322222222", x"ff");
wb_write(add_off(a, 10), x"5555555544444444", x"ff");
wb_write(add_off(a, 11), x"7777777766666666", x"ff");
wb_write(add_off(a, 12), x"9999999988888888", x"ff");
wb_write(add_off(a, 13), x"bbbbbbbbaaaaaaaa", x"ff");
wb_write(add_off(a, 14), x"ddddddddcccccccc", x"ff");
wb_write(add_off(a, 15), x"ffffffffeeeeeeee", x"ff");
wait_acks(16);

report "Scattered from middle of line...";
clr_acks;
wb_read(add_off(a,24));
wb_read(add_off(a,32));
wb_read(add_off(a, 3));
wb_read(add_off(a, 4));
wb_read(add_off(a, 0));
wb_read(add_off(a,16));
wb_read(add_off(a, 2));
wait_acks(4);
read_data(d);
assert d = x"7777777766666666" report "bad data (24), got " & to_hstring(d) severity failure;

4
fpga/top-arty.vhdl
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@ -550,7 +550,7 @@ begin
wb_eth_cyc <= wb_ext_io_in.cyc and wb_ext_is_eth;

-- Remove top address bits as liteeth decoder doesn't know about them
wb_eth_adr <= x"000" & "000" & wb_ext_io_in.adr(16 downto 2);
wb_eth_adr <= x"000" & "000" & wb_ext_io_in.adr(14 downto 0);

-- LiteETH isn't pipelined
wb_eth_out.stall <= not wb_eth_out.ack;
@ -640,7 +640,7 @@ begin
-- Gate cyc with chip select from SoC
wb_sdcard_cyc <= wb_ext_io_in.cyc and wb_ext_is_sdcard;

wb_sdcard_adr <= x"0000" & wb_ext_io_in.adr(15 downto 2);
wb_sdcard_adr <= x"0000" & wb_ext_io_in.adr(13 downto 0);

wb_sdcard_out.stall <= not wb_sdcard_out.ack;


4
fpga/top-nexys-video.vhdl
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@ -444,7 +444,7 @@ begin
wb_eth_cyc <= wb_ext_io_in.cyc and wb_ext_is_eth;

-- Remove top address bits as liteeth decoder doesn't know about them
wb_eth_adr <= x"000" & "000" & wb_ext_io_in.adr(16 downto 2);
wb_eth_adr <= x"000" & "000" & wb_ext_io_in.adr(14 downto 0);

-- LiteETH isn't pipelined
wb_eth_out.stall <= not wb_eth_out.ack;
@ -533,7 +533,7 @@ begin
-- Gate cyc with chip select from SoC
wb_sdcard_cyc <= wb_ext_io_in.cyc and wb_ext_is_sdcard;

wb_sdcard_adr <= x"0000" & wb_ext_io_in.adr(15 downto 2);
wb_sdcard_adr <= x"0000" & wb_ext_io_in.adr(13 downto 0);

wb_sdcard_out.stall <= not wb_sdcard_out.ack;


4
gpio.vhdl
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@ -58,7 +58,7 @@ begin

-- Wishbone response
wb_rsp.ack <= wb_in.cyc and wb_in.stb;
with wb_in.adr(GPIO_REG_BITS + 1 downto 2) select reg_out <=
with wb_in.adr(GPIO_REG_BITS - 1 downto 0) select reg_out <=
reg_data when GPIO_REG_DATA_OUT,
reg_in2 when GPIO_REG_DATA_IN,
reg_dirn when GPIO_REG_DIR,
@ -79,7 +79,7 @@ begin
wb_out.ack <= '0';
else
if wb_in.cyc = '1' and wb_in.stb = '1' and wb_in.we = '1' then
case wb_in.adr(GPIO_REG_BITS + 1 downto 2) is
case wb_in.adr(GPIO_REG_BITS - 1 downto 0) is
when GPIO_REG_DATA_OUT =>
reg_data <= wb_in.dat(NGPIO - 1 downto 0);
when GPIO_REG_DIR =>

16
icache.vhdl
Unescape Escape View File

@ -237,7 +237,7 @@ architecture rtl of icache is
end;

-- Return the cache row index (data memory) for an address
function get_row(addr: std_ulogic_vector(63 downto 0)) return row_t is
function get_row(addr: std_ulogic_vector) return row_t is
begin
return to_integer(unsigned(addr(SET_SIZE_BITS - 1 downto ROW_OFF_BITS)));
end;
@ -253,7 +253,7 @@ architecture rtl of icache is
-- Returns whether this is the last row of a line
function is_last_row_addr(addr: wishbone_addr_type; last: row_in_line_t) return boolean is
begin
return unsigned(addr(LINE_OFF_BITS-1 downto ROW_OFF_BITS)) = last;
return unsigned(addr(LINE_OFF_BITS - ROW_OFF_BITS - 1 downto 0)) = last;
end;

-- Returns whether this is the last row of a line
@ -269,10 +269,10 @@ architecture rtl of icache is
variable result : wishbone_addr_type;
begin
-- Is there no simpler way in VHDL to generate that 3 bits adder ?
row_idx := addr(LINE_OFF_BITS-1 downto ROW_OFF_BITS);
row_idx := addr(ROW_LINEBITS - 1 downto 0);
row_idx := std_ulogic_vector(unsigned(row_idx) + 1);
result := addr;
result(LINE_OFF_BITS-1 downto ROW_OFF_BITS) := row_idx;
result(ROW_LINEBITS - 1 downto 0) := row_idx;
return result;
end;

@ -525,7 +525,7 @@ begin
-- used for cache miss processing if needed
--
req_laddr <= (63 downto REAL_ADDR_BITS => '0') &
real_addr(REAL_ADDR_BITS - 1 downto ROW_OFF_BITS) &
real_addr(REAL_ADDR_BITS - 1 downto ROW_OFF_BITS)&
(ROW_OFF_BITS-1 downto 0 => '0');

-- Test if pending request is a hit on any way
@ -658,7 +658,7 @@ begin
-- Since we never write, any write should be snooped
snoop_valid <= wb_snoop_in.cyc and wb_snoop_in.stb and wb_snoop_in.we;
snoop_addr := (others => '0');
snoop_addr(wb_snoop_in.adr'left downto 0) := wb_snoop_in.adr;
snoop_addr(wb_snoop_in.adr'left + ROW_OFF_BITS downto ROW_OFF_BITS) := wb_snoop_in.adr;
snoop_index <= get_index(snoop_addr);
snoop_cache_tags := cache_tags(get_index(snoop_addr));
snoop_tag := get_tag(snoop_addr, '0');
@ -717,7 +717,7 @@ begin
-- Prep for first wishbone read. We calculate the address of
-- the start of the cache line and start the WB cycle.
--
r.wb.adr <= req_laddr(r.wb.adr'left downto 0);
r.wb.adr <= req_laddr(r.wb.adr'left + ROW_OFF_BITS downto ROW_OFF_BITS);
r.wb.cyc <= '1';
r.wb.stb <= '1';

@ -804,7 +804,7 @@ begin
log_data <= i_out.valid &
i_out.insn &
wishbone_in.ack &
r.wb.adr(5 downto 3) &
r.wb.adr(2 downto 0) &
r.wb.stb & r.wb.cyc &
wishbone_in.stall &
stall_out &

44
litedram/extras/litedram-wrapper-l2.vhdl
Unescape Escape View File

@ -163,7 +163,6 @@ architecture behaviour of litedram_wrapper is
-- Select a WB word inside DRAM port width
constant WB_WORD_COUNT : positive := DRAM_DBITS/WBL;
constant WB_WSEL_BITS : positive := log2(WB_WORD_COUNT);
constant WB_WSEL_RIGHT : positive := log2(WBL/8);

-- BRAM organisation: We never access more than wishbone_data_bits at
-- a time so to save resources we make the array only that wide, and
@ -312,10 +311,20 @@ architecture behaviour of litedram_wrapper is
-- Helper functions to decode incoming requests
--

-- Return the DRAM real address from a wishbone address
function get_real_addr(addr: wishbone_addr_type) return std_ulogic_vector is
variable ra: std_ulogic_vector(REAL_ADDR_BITS - 1 downto 0) := (others => '0');
begin
ra(REAL_ADDR_BITS - 1 downto wishbone_log2_width) :=
addr(REAL_ADDR_BITS - wishbone_log2_width - 1 downto 0);
return ra;
end;

-- Return the cache line index (tag index) for an address
function get_index(addr: wishbone_addr_type) return index_t is
begin
return to_integer(unsigned(addr(SET_SIZE_BITS - 1 downto LINE_OFF_BITS)));
return to_integer(unsigned(addr(SET_SIZE_BITS - wishbone_log2_width - 1 downto
LINE_OFF_BITS - wishbone_log2_width)));
end;

-- Return the cache row index (data memory) for an address
@ -378,7 +387,8 @@ architecture behaviour of litedram_wrapper is
-- Get the tag value from the address
function get_tag(addr: wishbone_addr_type) return cache_tag_t is
begin
return addr(REAL_ADDR_BITS - 1 downto SET_SIZE_BITS);
return addr(REAL_ADDR_BITS - wishbone_log2_width - 1 downto
SET_SIZE_BITS - wishbone_log2_width);
end;

-- Read a tag from a tag memory row
@ -447,7 +457,7 @@ begin
wb_ctrl_stb <= '0';
else
-- XXX Maybe only update addr when cyc = '1' to save power ?
wb_ctrl_adr <= x"0000" & wb_ctrl_in.adr(15 downto 2);
wb_ctrl_adr <= x"0000" & wb_ctrl_in.adr(13 downto 0);
wb_ctrl_dat_w <= wb_ctrl_in.dat;
wb_ctrl_sel <= wb_ctrl_in.sel;
wb_ctrl_we <= wb_ctrl_in.we;
@ -608,7 +618,7 @@ begin
if stall = '1' and wb_out.stall = '0' and wb_in.cyc = '1' and wb_in.stb = '1' then
wb_stash <= wb_in;
if TRACE then
report "stashed wb req ! addr:" & to_hstring(wb_in.adr) &
report "stashed wb req ! addr:" & to_hstring(wb_in.adr & "000") &
" we:" & std_ulogic'image(wb_in.we) &
" sel:" & to_hstring(wb_in.sel);
end if;
@ -621,7 +631,7 @@ begin
wb_req <= wb_stash;
wb_stash.cyc <= '0';
if TRACE then
report "unstashed wb req ! addr:" & to_hstring(wb_stash.adr) &
report "unstashed wb req ! addr:" & to_hstring(wb_stash.adr & "000") &
" we:" & std_ulogic'image(wb_stash.we) &
" sel:" & to_hstring(wb_stash.sel);
end if;
@ -636,7 +646,7 @@ begin

if TRACE then
if wb_in.cyc = '1' and wb_in.stb = '1' then
report "latch new wb req ! addr:" & to_hstring(wb_in.adr) &
report "latch new wb req ! addr:" & to_hstring(wb_in.adr & "000") &
" we:" & std_ulogic'image(wb_in.we) &
" sel:" & to_hstring(wb_in.sel);
end if;
@ -665,12 +675,12 @@ begin

if TRACE then
if req_op = OP_LOAD_HIT then
report "Load hit addr:" & to_hstring(wb_req.adr) &
report "Load hit addr:" & to_hstring(wb_req.adr & "000") &
" idx:" & integer'image(req_index) &
" tag:" & to_hstring(req_tag) &
" way:" & integer'image(req_hit_way);
elsif req_op = OP_LOAD_MISS then
report "Load miss addr:" & to_hstring(wb_req.adr);
report "Load miss addr:" & to_hstring(wb_req.adr & "000");
end if;
if read_ack_0 = '1' then
report "read data:" & to_hstring(cache_out(read_way_0));
@ -771,20 +781,19 @@ begin
begin
-- Extract line, row and tag from request
req_index <= get_index(wb_req.adr);
req_row <= get_row(wb_req.adr(REAL_ADDR_BITS-1 downto 0));
req_row <= get_row(get_real_addr(wb_req.adr));
req_tag <= get_tag(wb_req.adr);

-- Calculate address of beginning of cache row, will be
-- used for cache miss processing if needed
req_laddr <= wb_req.adr(REAL_ADDR_BITS - 1 downto ROW_OFF_BITS) &
(ROW_OFF_BITS-1 downto 0 => '0');
req_laddr <= get_real_addr(wb_req.adr);


-- Do we have a valid request in the WB latch ?
valid := wb_req.cyc = '1' and wb_req.stb = '1';

-- Store signals (hard wired for 64-bit wishbone at the moment)
req_wsl <= wb_req.adr(WB_WSEL_RIGHT+WB_WSEL_BITS-1 downto WB_WSEL_RIGHT);
req_wsl <= wb_req.adr(WB_WSEL_BITS-1 downto 0);
for i in 0 to WB_WORD_COUNT-1 loop
if to_integer(unsigned(req_wsl)) = i then
req_we(WBSL*(i+1)-1 downto WBSL*i) <= wb_req.sel;
@ -892,7 +901,7 @@ begin
variable stq_wsl : std_ulogic_vector(WB_WSEL_BITS-1 downto 0);
begin
storeq_wr_data <= wb_req.dat & wb_req.sel &
wb_req.adr(WB_WSEL_RIGHT+WB_WSEL_BITS-1 downto WB_WSEL_RIGHT);
wb_req.adr(WB_WSEL_BITS-1 downto 0);

-- Only queue stores if we can also send a command
if req_op = OP_STORE_HIT or req_op = OP_STORE_MISS then
@ -927,13 +936,13 @@ begin
if rising_edge(system_clk) then
if req_op = OP_STORE_HIT then
report "Store hit to:" &
to_hstring(wb_req.adr(DRAM_ABITS+3 downto 0)) &
to_hstring(wb_req.adr(DRAM_ABITS downto 0) & "000") &
" data:" & to_hstring(req_wdata) &
" we:" & to_hstring(req_we) &
" V:" & std_ulogic'image(user_port0_cmd_ready);
else
report "Store miss to:" &
to_hstring(wb_req.adr(DRAM_ABITS+3 downto 0)) &
to_hstring(wb_req.adr(DRAM_ABITS downto 0) & "000") &
" data:" & to_hstring(req_wdata) &
" we:" & to_hstring(req_we) &
" V:" & std_ulogic'image(user_port0_cmd_ready);
@ -954,7 +963,8 @@ begin
if req_op = OP_STORE_HIT or req_op = OP_STORE_MISS then
-- For stores, forward signals directly. Only send command if
-- the FIFO can accept a store.
user_port0_cmd_addr <= wb_req.adr(DRAM_ABITS+ROW_OFF_BITS-1 downto ROW_OFF_BITS);
user_port0_cmd_addr <= wb_req.adr(DRAM_ABITS + ROW_OFF_BITS - wishbone_log2_width - 1 downto
ROW_OFF_BITS - wishbone_log2_width);
user_port0_cmd_we <= '1';
user_port0_cmd_valid <= storeq_wr_ready;
else

2
litedram/gen-src/dram-init-mem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

2
litedram/generated/acorn-cle-215/litedram-initmem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

2
litedram/generated/arty/litedram-initmem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

2
litedram/generated/genesys2/litedram-initmem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

2
litedram/generated/nexys-video/litedram-initmem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

2
litedram/generated/sim/litedram-initmem.vhdl
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@ -100,7 +100,7 @@ begin
if rising_edge(clk) then
oack <= '0';
if (wb_in.cyc and wb_in.stb) = '1' then
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS-1 downto 2))));
adr := to_integer((unsigned(wb_in.adr(INIT_RAM_ABITS - 3 downto 0))));
if wb_in.we = '0' then
obuf <= init_ram(adr);
else

38
soc.vhdl
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@ -248,10 +248,10 @@ architecture behaviour of soc is
function wishbone_widen_data(wb : wb_io_master_out) return wishbone_master_out is
variable wwb : wishbone_master_out;
begin
wwb.adr := wb.adr & "00"; -- XXX note wrong adr usage in wishbone_master_out
wwb.adr := wb.adr(wb.adr'left downto 1);
wwb.dat := wb.dat & wb.dat;
wwb.sel := x"00";
if wwb.adr(2) = '0' then
if wb.adr(0) = '0' then
wwb.sel(3 downto 0) := wb.sel;
else
wwb.sel(7 downto 4) := wb.sel;
@ -405,7 +405,7 @@ begin
variable top_decode : std_ulogic_vector(3 downto 0);
begin
-- Top-level address decoder
top_decode := wb_master_out.adr(31 downto 29) & dram_at_0;
top_decode := wb_master_out.adr(28 downto 26) & dram_at_0;
slave_top := SLAVE_TOP_BRAM;
if std_match(top_decode, "0000") then
slave_top := SLAVE_TOP_BRAM;
@ -491,7 +491,7 @@ begin

-- Copy write enable to IO out, copy address as well
wb_sio_out.we <= wb_io_in.we;
wb_sio_out.adr <= wb_io_in.adr(wb_sio_out.adr'left downto 3) & "000";
wb_sio_out.adr <= wb_io_in.adr(wb_sio_out.adr'left - 1 downto 0) & '0';

-- Do we have a top word and/or a bottom word ?
has_top := wb_io_in.sel(7 downto 4) /= "0000";
@ -515,7 +515,7 @@ begin
wb_sio_out.sel <= wb_io_in.sel(7 downto 4);

-- Bump address
wb_sio_out.adr(2) <= '1';
wb_sio_out.adr(0) <= '1';

-- Wait for ack
state := WAIT_ACK_TOP;
@ -543,7 +543,7 @@ begin
wb_sio_out.sel <= wb_io_in.sel(7 downto 4);

-- Bump address and set STB
wb_sio_out.adr(2) <= '1';
wb_sio_out.adr(0) <= '1';
wb_sio_out.stb <= '1';

-- Wait for new ack
@ -601,7 +601,7 @@ begin

-- Simple address decoder.
slave_io := SLAVE_IO_NONE;
match := "11" & wb_sio_out.adr(29 downto 12);
match := "11" & wb_sio_out.adr(27 downto 10);
if std_match(match, x"FF---") and HAS_DRAM then
slave_io := SLAVE_IO_EXTERNAL;
elsif std_match(match, x"F----") then
@ -638,11 +638,11 @@ begin
-- Only give xics 8 bits of wb addr (for now...)
wb_xics_icp_in <= wb_sio_out;
wb_xics_icp_in.adr <= (others => '0');
wb_xics_icp_in.adr(7 downto 0) <= wb_sio_out.adr(7 downto 0);
wb_xics_icp_in.adr(5 downto 0) <= wb_sio_out.adr(5 downto 0);
wb_xics_icp_in.cyc <= '0';
wb_xics_ics_in <= wb_sio_out;
wb_xics_ics_in.adr <= (others => '0');
wb_xics_ics_in.adr(11 downto 0) <= wb_sio_out.adr(11 downto 0);
wb_xics_ics_in.adr(9 downto 0) <= wb_sio_out.adr(9 downto 0);
wb_xics_ics_in.cyc <= '0';

wb_ext_io_in <= wb_sio_out;
@ -667,22 +667,22 @@ begin
--
-- DRAM init is special at 0xFF* so we just test the top
-- bit. Everything else is at 0xC8* so we test only bits
-- 23 downto 16.
-- 23 downto 16 (21 downto 14 in the wishbone addr).
--
ext_valid := false;
if wb_sio_out.adr(29) = '1' and HAS_DRAM then -- DRAM init is special
if wb_sio_out.adr(27) = '1' and HAS_DRAM then -- DRAM init is special
wb_ext_is_dram_init <= '1';
ext_valid := true;
elsif wb_sio_out.adr(23 downto 16) = x"00" and HAS_DRAM then
elsif wb_sio_out.adr(21 downto 14) = x"00" and HAS_DRAM then
wb_ext_is_dram_csr <= '1';
ext_valid := true;
elsif wb_sio_out.adr(23 downto 16) = x"02" and HAS_LITEETH then
elsif wb_sio_out.adr(21 downto 14) = x"02" and HAS_LITEETH then
wb_ext_is_eth <= '1';
ext_valid := true;
elsif wb_sio_out.adr(23 downto 16) = x"03" and HAS_LITEETH then
elsif wb_sio_out.adr(21 downto 14) = x"03" and HAS_LITEETH then
wb_ext_is_eth <= '1';
ext_valid := true;
elsif wb_sio_out.adr(23 downto 16) = x"04" and HAS_SD_CARD then
elsif wb_sio_out.adr(21 downto 14) = x"04" and HAS_SD_CARD then
wb_ext_is_sdcard <= '1';
ext_valid := true;
end if;
@ -709,7 +709,7 @@ begin
when SLAVE_IO_SPI_FLASH_MAP =>
-- Clear top bits so they don't make their way to the
-- fash chip.
wb_spiflash_in.adr(29 downto 28) <= "00";
wb_spiflash_in.adr(27 downto 26) <= "00";
wb_spiflash_in.cyc <= wb_sio_out.cyc;
wb_sio_in <= wb_spiflash_out;
wb_spiflash_is_map <= '1';
@ -767,7 +767,7 @@ begin
txd => uart0_txd,
rxd => uart0_rxd,
irq => uart0_irq,
wb_adr_in => wb_uart0_in.adr(11 downto 0),
wb_adr_in => wb_uart0_in.adr(9 downto 0) & "00",
wb_dat_in => wb_uart0_in.dat(7 downto 0),
wb_dat_out => uart0_dat8,
wb_cyc_in => wb_uart0_in.cyc,
@ -784,7 +784,7 @@ begin
port map (
wb_clk_i => system_clk,
wb_rst_i => rst_uart,
wb_adr_i => wb_uart0_in.adr(4 downto 2),
wb_adr_i => wb_uart0_in.adr(2 downto 0),
wb_dat_i => wb_uart0_in.dat(7 downto 0),
wb_dat_o => uart0_dat8,
wb_we_i => wb_uart0_in.we,
@ -826,7 +826,7 @@ begin
port map (
wb_clk_i => system_clk,
wb_rst_i => rst_uart,
wb_adr_i => wb_uart1_in.adr(4 downto 2),
wb_adr_i => wb_uart1_in.adr(2 downto 0),
wb_dat_i => wb_uart1_in.dat(7 downto 0),
wb_dat_o => uart1_dat8,
wb_we_i => wb_uart1_in.we,

6
spi_flash_ctrl.vhdl
Unescape Escape View File

@ -43,7 +43,7 @@ architecture rtl of spi_flash_ctrl is
-- Register indices
constant SPI_REG_BITS : positive := 3;

-- Register addresses (matches wishbone addr downto 2, ie, 4 bytes per reg)
-- Register addresses (matches wishbone addr downto 0, ie, 4 bytes per reg)
constant SPI_REG_DATA : std_ulogic_vector(SPI_REG_BITS-1 downto 0) := "000";
constant SPI_REG_CTRL : std_ulogic_vector(SPI_REG_BITS-1 downto 0) := "001";
constant SPI_REG_AUTO_CFG : std_ulogic_vector(SPI_REG_BITS-1 downto 0) := "010";
@ -162,7 +162,7 @@ begin
wb_map_valid <= wb_valid and wb_sel_map;

-- Register decode. For map accesses, make it look like "invalid"
wb_reg <= wb_req.adr(SPI_REG_BITS+1 downto 2) when wb_reg_valid else SPI_REG_INVALID;
wb_reg <= wb_req.adr(SPI_REG_BITS - 1 downto 0) when wb_reg_valid else SPI_REG_INVALID;

-- Shortcut because we test that a lot: data register access
wb_reg_dat_v <= '1' when wb_reg = SPI_REG_DATA else '0';
@ -393,7 +393,7 @@ begin

-- Convert wishbone address into a flash address. We mask
-- off the 4 top address bits to get rid of the "f" there.
addr := "00" & wb_req.adr(29 downto 2) & "00";
addr := "00" & wb_req.adr(27 downto 0) & "00";

-- Calculate the next address for store & compare later
auto_lad_next <= std_ulogic_vector(unsigned(addr) + 4);

8
syscon.vhdl
Unescape Escape View File

@ -171,7 +171,7 @@ begin

-- Wishbone response
wb_rsp.ack <= wishbone_in.cyc and wishbone_in.stb;
with wishbone_in.adr(SYS_REG_BITS+2 downto 3) select reg_out <=
with wishbone_in.adr(SYS_REG_BITS downto 1) select reg_out <=
SIG_VALUE when SYS_REG_SIG,
reg_info when SYS_REG_INFO,
reg_braminfo when SYS_REG_BRAMINFO,
@ -183,7 +183,7 @@ begin
reg_uart0info when SYS_REG_UART0_INFO,
reg_uart1info when SYS_REG_UART1_INFO,
(others => '0') when others;
wb_rsp.dat <= reg_out(63 downto 32) when wishbone_in.adr(2) = '1' else
wb_rsp.dat <= reg_out(63 downto 32) when wishbone_in.adr(0) = '1' else
reg_out(31 downto 0);
wb_rsp.stall <= '0';

@ -205,8 +205,8 @@ begin
else
if wishbone_in.cyc and wishbone_in.stb and wishbone_in.we then
-- Change this if CTRL ever has more than 32 bits
if wishbone_in.adr(SYS_REG_BITS+2 downto 3) = SYS_REG_CTRL and
wishbone_in.adr(2) = '0' then
if wishbone_in.adr(SYS_REG_BITS downto 1) = SYS_REG_CTRL and
wishbone_in.adr(0) = '0' then
reg_ctrl(SYS_REG_CTRL_BITS-1 downto 0) <=
wishbone_in.dat(SYS_REG_CTRL_BITS-1 downto 0);
end if;

2
wishbone_bram_tb.vhdl
Unescape Escape View File

@ -19,7 +19,7 @@ architecture behave of wishbone_bram_tb is

impure function to_adr(a: integer) return std_ulogic_vector is
begin
return std_ulogic_vector(to_unsigned(a, w_out.adr'length));
return std_ulogic_vector(to_unsigned(a / 8, w_out.adr'length));
end;
begin
simple_ram_0: entity work.wishbone_bram_wrapper

2
wishbone_bram_wrapper.vhdl
Unescape Escape View File

@ -54,7 +54,7 @@ begin
);

-- Wishbone interface
ram_addr <= wishbone_in.adr(ram_addr_bits + 2 downto 3);
ram_addr <= wishbone_in.adr(ram_addr_bits - 1 downto 0);
ram_we <= wishbone_in.stb and wishbone_in.cyc and wishbone_in.we;
ram_re <= wishbone_in.stb and wishbone_in.cyc and not wishbone_in.we;
wishbone_out.stall <= '0';

2
wishbone_debug_master.vhdl
Unescape Escape View File

@ -118,7 +118,7 @@ begin
dmi_ack <= dmi_req when (dmi_addr /= DBG_WB_DATA or state = DMI_WAIT) else '0';

-- Some WB signals are direct wires from registers or DMI
wb_out.adr <= reg_addr(wb_out.adr'left downto 0);
wb_out.adr <= reg_addr(wb_out.adr'left + wishbone_log2_width downto wishbone_log2_width);
wb_out.dat <= dmi_din;
wb_out.sel <= reg_ctrl(7 downto 0);
wb_out.we <= dmi_wr;

6
wishbone_types.vhdl
Unescape Escape View File

@ -3,11 +3,13 @@ use ieee.std_logic_1164.all;

package wishbone_types is
--
-- Main CPU bus. 32-bit address, 64-bit data
-- Main CPU bus. 32-bit address, 64-bit data,
-- so the wishbone address is in units of 8 bytes.
--
constant wishbone_addr_bits : integer := 32;
constant wishbone_addr_bits : integer := 29;
constant wishbone_data_bits : integer := 64;
constant wishbone_sel_bits : integer := wishbone_data_bits/8;
constant wishbone_log2_width : integer := 3;

subtype wishbone_addr_type is std_ulogic_vector(wishbone_addr_bits-1 downto 0);
subtype wishbone_data_type is std_ulogic_vector(wishbone_data_bits-1 downto 0);

12
xics.vhdl
Unescape Escape View File

@ -111,7 +111,7 @@ begin
v.wb_ack := '1'; -- always ack
if wb_in.we = '1' then -- write
-- writes to both XIRR are the same
case wb_in.adr(7 downto 0) is
case wb_in.adr(5 downto 0) & "00" is
when XIRR_POLL =>
report "ICP XIRR_POLL write";
v.cppr := be_in(31 downto 24);
@ -138,7 +138,7 @@ begin

else -- read

case wb_in.adr(7 downto 0) is
case wb_in.adr(5 downto 0) & "00" is
when XIRR_POLL =>
report "ICP XIRR_POLL read";
be_out := r.cppr & r.xisr;
@ -308,12 +308,12 @@ begin

assert SRC_NUM = 16 report "Fixup address decode with log2";

reg_is_xive <= wb_in.adr(11);
reg_is_config <= '1' when wb_in.adr(11 downto 0) = x"000" else '0';
reg_is_debug <= '1' when wb_in.adr(11 downto 0) = x"004" else '0';
reg_is_xive <= wb_in.adr(9);
reg_is_config <= '1' when wb_in.adr(9 downto 0) = 10x"000" else '0';
reg_is_debug <= '1' when wb_in.adr(9 downto 0) = 10x"001" else '0';

-- Register index XX FIXME: figure out bits from SRC_NUM
reg_idx <= to_integer(unsigned(wb_in.adr(5 downto 2)));
reg_idx <= to_integer(unsigned(wb_in.adr(3 downto 0)));

-- Latch interrupt inputs for timing
int_latch: process(clk)

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