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litedram: Update to new LiteX/LiteDRAM version

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Things have changed a bit in upstream LiteX. LiteDRAM now exposes a
wishbone for the CSRs for example.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
pull/177/head
Benjamin Herrenschmidt 5 years ago
parent 13e84b0bbb
commit c19b5b8cc7
20 changed files with 5523 additions and 4404 deletions
Show Stats Download Patch File Download Diff File

6
fpga/top-arty.vhdl
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@ -68,7 +68,7 @@ architecture behaviour of toplevel is
-- DRAM wishbone connection -- DRAM wishbone connection
signal wb_dram_in : wishbone_master_out; signal wb_dram_in : wishbone_master_out;
signal wb_dram_out : wishbone_slave_out; signal wb_dram_out : wishbone_slave_out;
signal wb_dram_csr : std_ulogic; signal wb_dram_ctrl : std_ulogic;
signal wb_dram_init : std_ulogic; signal wb_dram_init : std_ulogic;


-- Control/status -- Control/status
@ -104,7 +104,7 @@ begin
uart0_rxd => uart_main_rx, uart0_rxd => uart_main_rx,
wb_dram_in => wb_dram_in, wb_dram_in => wb_dram_in,
wb_dram_out => wb_dram_out, wb_dram_out => wb_dram_out,
wb_dram_csr => wb_dram_csr, wb_dram_ctrl => wb_dram_ctrl,
wb_dram_init => wb_dram_init, wb_dram_init => wb_dram_init,
alt_reset => core_alt_reset alt_reset => core_alt_reset
); );
@ -194,7 +194,7 @@ begin


wb_in => wb_dram_in, wb_in => wb_dram_in,
wb_out => wb_dram_out, wb_out => wb_dram_out,
wb_is_csr => wb_dram_csr, wb_is_ctrl => wb_dram_ctrl,
wb_is_init => wb_dram_init, wb_is_init => wb_dram_init,


serial_tx => uart_pmod_tx, serial_tx => uart_pmod_tx,

6
fpga/top-nexys-video.vhdl
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@ -60,7 +60,7 @@ architecture behaviour of toplevel is
-- DRAM wishbone connection -- DRAM wishbone connection
signal wb_dram_in : wishbone_master_out; signal wb_dram_in : wishbone_master_out;
signal wb_dram_out : wishbone_slave_out; signal wb_dram_out : wishbone_slave_out;
signal wb_dram_csr : std_ulogic; signal wb_dram_ctrl : std_ulogic;
signal wb_dram_init : std_ulogic; signal wb_dram_init : std_ulogic;


-- Control/status -- Control/status
@ -87,7 +87,7 @@ begin
uart0_rxd => uart_main_rx, uart0_rxd => uart_main_rx,
wb_dram_in => wb_dram_in, wb_dram_in => wb_dram_in,
wb_dram_out => wb_dram_out, wb_dram_out => wb_dram_out,
wb_dram_csr => wb_dram_csr, wb_dram_ctrl => wb_dram_ctrl,
wb_dram_init => wb_dram_init, wb_dram_init => wb_dram_init,
alt_reset => core_alt_reset alt_reset => core_alt_reset
); );
@ -175,7 +175,7 @@ begin


wb_in => wb_dram_in, wb_in => wb_dram_in,
wb_out => wb_dram_out, wb_out => wb_dram_out,
wb_is_csr => wb_dram_csr, wb_is_ctrl => wb_dram_ctrl,
wb_is_init => wb_dram_init, wb_is_init => wb_dram_init,


serial_tx => open, serial_tx => open,

3
include/console.h
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@ -6,4 +6,7 @@ void potato_uart_irq_dis(void);
int getchar(void); int getchar(void);
int putchar(int c); int putchar(int c);
int puts(const char *str); int puts(const char *str);

#ifndef __USE_LIBC
size_t strlen(const char *s); size_t strlen(const char *s);
#endif

3
include/microwatt_soc.h
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@ -31,4 +31,7 @@
#define POTATO_CONSOLE_CLOCK_DIV 0x18 #define POTATO_CONSOLE_CLOCK_DIV 0x18
#define POTATO_CONSOLE_IRQ_EN 0x20 #define POTATO_CONSOLE_IRQ_EN 0x20


/* Definition for the LiteDRAM control registers */
#define DRAM_CTRL_BASE 0xc0100000

#endif /* __MICROWATT_SOC_H */ #endif /* __MICROWATT_SOC_H */

2
lib/console.c
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@ -120,6 +120,7 @@ int puts(const char *str)
return 0; return 0;
} }


#ifndef __USE_LIBC
size_t strlen(const char *s) size_t strlen(const char *s)
{ {
size_t len = 0; size_t len = 0;
@ -129,3 +130,4 @@ size_t strlen(const char *s)


return len; return len;
} }
#endif

4
litedram/gen-src/arty.yml
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@ -37,7 +37,5 @@
}, },


# CSR Port ----------------------------------------------------------------- # CSR Port -----------------------------------------------------------------
"csr_expose": "False", # expose access to CSR (I/O) ports "csr_base" : 0xc0100000, # For cpu=None only
"csr_align" : 32, # CSR alignment
"csr_base" : 0xc0100000 # For cpu=None only
} }

3
litedram/gen-src/generate.py
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@ -104,8 +104,7 @@ def generate_one(t, mw_init):
# Override values for mw_init # Override values for mw_init
if mw_init: if mw_init:
core_config["cpu"] = None core_config["cpu"] = None
core_config["csr_expose"] = True core_config["csr_alignment"] = 64
core_config["csr_align"] = 64


# Generate core # Generate core
if core_config["sdram_phy"] in [litedram_phys.ECP5DDRPHY]: if core_config["sdram_phy"] in [litedram_phys.ECP5DDRPHY]:

3
litedram/gen-src/nexys-video.yml
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@ -37,6 +37,5 @@
}, },


# CSR Port ----------------------------------------------------------------- # CSR Port -----------------------------------------------------------------
"csr_expose": "False", # expose access to CSR (I/O) ports "csr_base" : 0xc0100000, # For cpu=None only
"csr_align" : 32, # 64-bit alignment
} }

4
litedram/gen-src/sdram_init/Makefile
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@ -21,7 +21,7 @@ OBJCOPY = $(CROSS_COMPILE)objcopy


#### Flags #### Flags


CPPFLAGS = -nostdinc CPPFLAGS = -nostdinc -D__USE_LIBC
CPPFLAGS += -I$(SRC_DIR)/libc/include -I$(LXSRC_DIR) -I$(LXINC_DIR) -I$(GENINC_DIR) -I$(SRC_DIR)/include -I$(SRC_DIR)/../../../include CPPFLAGS += -I$(SRC_DIR)/libc/include -I$(LXSRC_DIR) -I$(LXINC_DIR) -I$(GENINC_DIR) -I$(SRC_DIR)/include -I$(SRC_DIR)/../../../include
CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include) CPPFLAGS += -isystem $(shell $(CC) -print-file-name=include)
CFLAGS = -Os -g -Wall -std=c99 -m64 -mabi=elfv2 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections -fno-delete-null-pointer-checks CFLAGS = -Os -g -Wall -std=c99 -m64 -mabi=elfv2 -msoft-float -mno-string -mno-multiple -mno-vsx -mno-altivec -mlittle-endian -fno-stack-protector -mstrict-align -ffreestanding -fdata-sections -ffunction-sections -fno-delete-null-pointer-checks
@ -36,7 +36,7 @@ define Q
endef endef
else else
define Q define Q
@echo " [$1] $(3)" @echo " [$1] " $(shell basename $3)
@$(2) @$(2)
endef endef
endif endif

28
litedram/gen-src/sdram_init/include/system.h
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@ -1,9 +1,18 @@
static inline void flush_cpu_dcache(void) { } #ifndef __SYSTEM_H
static inline void flush_l2_cache(void) { } #define __SYSTEM_H

#include "microwatt_soc.h"
#include "io.h"


#define CSR_ACCESSORS_DEFINED
#define CSR_BASE DRAM_CTRL_BASE
#define CONFIG_CPU_NOP "nop" #define CONFIG_CPU_NOP "nop"
#define CONFIG_CLOCK_FREQUENCY 100000000


extern void flush_cpu_dcache(void);
extern void flush_cpu_icache(void);
static inline void flush_l2_cache(void) { }

/* Fake timer stuff. LiteX should abstract this */
static inline void timer0_en_write(int e) { } static inline void timer0_en_write(int e) { }
static inline void timer0_reload_write(int r) { } static inline void timer0_reload_write(int r) { }
static inline void timer0_load_write(int l) { } static inline void timer0_load_write(int l) { }
@ -15,3 +24,16 @@ static inline uint64_t timer0_value_read(void)
__asm__ volatile ("mfdec %0" : "=r" (val)); __asm__ volatile ("mfdec %0" : "=r" (val));
return val; return val;
} }

static inline void csr_write_simple(unsigned long v, unsigned long a)
{
return writel(v, a);
}

static inline unsigned long csr_read_simple(unsigned long a)
{
return readl(a);
}

#endif /* __SYSTEM_H */


105
litedram/gen-src/sdram_init/main.c
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@ -10,89 +10,7 @@
#include "microwatt_soc.h" #include "microwatt_soc.h"
#include "io.h" #include "io.h"
#include "sdram.h" #include "sdram.h"

#include "console.h"
/*
* Core UART functions to implement for a port
*/

static uint64_t potato_uart_base;

#define PROC_FREQ 100000000
#define UART_FREQ 115200

static uint8_t potato_uart_reg_read(int offset)
{
return readb(potato_uart_base + offset);
}

static void potato_uart_reg_write(int offset, uint8_t val)
{
writeb(val, potato_uart_base + offset);
}

static bool potato_uart_rx_empty(void)
{
uint8_t val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);

return (val & POTATO_CONSOLE_STATUS_RX_EMPTY) != 0;
}

static int potato_uart_tx_full(void)
{
uint8_t val = potato_uart_reg_read(POTATO_CONSOLE_STATUS);

return (val & POTATO_CONSOLE_STATUS_TX_FULL) != 0;
}

static char potato_uart_read(void)
{
return potato_uart_reg_read(POTATO_CONSOLE_RX);
}

static void potato_uart_write(char c)
{
potato_uart_reg_write(POTATO_CONSOLE_TX, c);
}

static unsigned long potato_uart_divisor(unsigned long proc_freq,
unsigned long uart_freq)
{
return proc_freq / (uart_freq * 16) - 1;
}

void potato_uart_init(void)
{
potato_uart_base = UART_BASE;

potato_uart_reg_write(POTATO_CONSOLE_CLOCK_DIV,
potato_uart_divisor(PROC_FREQ, UART_FREQ));
}

int getchar(void)
{
while (potato_uart_rx_empty())
/* Do nothing */ ;

return potato_uart_read();
}

int putchar(int c)
{
while (potato_uart_tx_full())
/* Do Nothing */;

potato_uart_write(c);
return c;
}

void putstr(const char *str, unsigned long len)
{
for (unsigned long i = 0; i < len; i++) {
if (str[i] == '\n')
putchar('\r');
putchar(str[i]);
}
}


int _printf(const char *fmt, ...) int _printf(const char *fmt, ...)
{ {
@ -103,26 +21,33 @@ int _printf(const char *fmt, ...)
va_start(ap, fmt); va_start(ap, fmt);
count = vsnprintf(buffer, sizeof(buffer), fmt, ap); count = vsnprintf(buffer, sizeof(buffer), fmt, ap);
va_end(ap); va_end(ap);
putstr(buffer, count); puts(buffer);
return count; return count;
} }


void flush_cpu_dcache(void) { } void flush_cpu_dcache(void)
void flush_cpu_icache(void) { } {
void flush_l2_cache(void) { } }

void flush_cpu_icache(void)
{
__asm__ volatile ("icbi 0,0; isync" : : : "memory");
}


void main(void) void main(void)
{ {
unsigned long long ftr, val; unsigned long long ftr, val;
int i; int i;


/* Init the UART */
potato_uart_init();

/* /*
* Let things settle ... not sure why but the UART is * Let things settle ... not sure why but the UART is
* not happy otherwise. The PLL might need to settle ? * not happy otherwise. The PLL might need to settle ?
*/ */
potato_uart_init(); for (i = 0; i < 10000; i++)
for (i = 0; i < 100000; i++) readb(UART_BASE + POTATO_CONSOLE_STATUS);
potato_uart_reg_read(POTATO_CONSOLE_STATUS);
printf("\n\nWelcome to Microwatt !\n\n"); printf("\n\nWelcome to Microwatt !\n\n");


/* TODO: Add core version information somewhere in syscon, possibly /* TODO: Add core version information somewhere in syscon, possibly

75
litedram/gen-src/wrapper-mw-init.vhdl
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@ -25,7 +25,7 @@ entity litedram_wrapper is
-- Wishbone ports: -- Wishbone ports:
wb_in : in wishbone_master_out; wb_in : in wishbone_master_out;
wb_out : out wishbone_slave_out; wb_out : out wishbone_slave_out;
wb_is_csr : in std_ulogic; wb_is_ctrl : in std_ulogic;
wb_is_init : in std_ulogic; wb_is_init : in std_ulogic;


-- Init core serial debug -- Init core serial debug
@ -80,10 +80,17 @@ architecture behaviour of litedram_wrapper is
init_error : out std_ulogic; init_error : out std_ulogic;
user_clk : out std_ulogic; user_clk : out std_ulogic;
user_rst : out std_ulogic; user_rst : out std_ulogic;
csr_port0_adr : in std_ulogic_vector(13 downto 0); wb_ctrl_adr : in std_ulogic_vector(29 downto 0);
csr_port0_we : in std_ulogic; wb_ctrl_dat_w : in std_ulogic_vector(31 downto 0);
csr_port0_dat_w : in std_ulogic_vector(31 downto 0); wb_ctrl_dat_r : out std_ulogic_vector(31 downto 0);
csr_port0_dat_r : out std_ulogic_vector(31 downto 0); wb_ctrl_sel : in std_ulogic_vector(3 downto 0);
wb_ctrl_cyc : in std_ulogic;
wb_ctrl_stb : in std_ulogic;
wb_ctrl_ack : out std_ulogic;
wb_ctrl_we : in std_ulogic;
wb_ctrl_cti : in std_ulogic_vector(2 downto 0);
wb_ctrl_bte : in std_ulogic_vector(1 downto 0);
wb_ctrl_err : out std_ulogic;
user_port_native_0_cmd_valid : in std_ulogic; user_port_native_0_cmd_valid : in std_ulogic;
user_port_native_0_cmd_ready : out std_ulogic; user_port_native_0_cmd_ready : out std_ulogic;
user_port_native_0_cmd_we : in std_ulogic; user_port_native_0_cmd_we : in std_ulogic;
@ -114,18 +121,19 @@ architecture behaviour of litedram_wrapper is


signal dram_user_reset : std_ulogic; signal dram_user_reset : std_ulogic;


signal csr_port0_adr : std_ulogic_vector(13 downto 0); signal wb_ctrl_adr : std_ulogic_vector(29 downto 0);
signal csr_port0_we : std_ulogic; signal wb_ctrl_dat_w : std_ulogic_vector(31 downto 0);
signal csr_port0_dat_w : std_ulogic_vector(31 downto 0); signal wb_ctrl_dat_r : std_ulogic_vector(31 downto 0);
signal csr_port0_dat_r : std_ulogic_vector(31 downto 0); signal wb_ctrl_sel : std_ulogic_vector(3 downto 0);
signal csr_port_read_comb : std_ulogic_vector(63 downto 0); signal wb_ctrl_cyc : std_ulogic;
signal csr_valid : std_ulogic; signal wb_ctrl_stb : std_ulogic;
signal csr_write_valid : std_ulogic; signal wb_ctrl_ack : std_ulogic;
signal wb_ctrl_we : std_ulogic;


signal wb_init_in : wishbone_master_out; signal wb_init_in : wishbone_master_out;
signal wb_init_out : wishbone_slave_out; signal wb_init_out : wishbone_slave_out;


type state_t is (CMD, MWRITE, MREAD, CSR); type state_t is (CMD, MWRITE, MREAD);
signal state : state_t; signal state : state_t;


constant INIT_RAM_SIZE : integer := 16384; constant INIT_RAM_SIZE : integer := 16384;
@ -192,7 +200,7 @@ begin
ad3 <= wb_in.adr(3); ad3 <= wb_in.adr(3);


-- DRAM data interface signals -- DRAM data interface signals
user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_csr and not wb_is_init) user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_ctrl and not wb_is_init)
when state = CMD else '0'; when state = CMD else '0';
user_port0_cmd_we <= wb_in.we when state = CMD else '0'; user_port0_cmd_we <= wb_in.we when state = CMD else '0';
user_port0_wdata_valid <= '1' when state = MWRITE else '0'; user_port0_wdata_valid <= '1' when state = MWRITE else '0';
@ -202,21 +210,21 @@ begin
user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else
"00000000" & wb_in.sel; "00000000" & wb_in.sel;


-- DRAM CSR interface signals. We only support access to the bottom byte -- DRAM ctrl interface signals
csr_valid <= wb_in.cyc and wb_in.stb and wb_is_csr; wb_ctrl_adr <= x"0000" & wb_in.adr(15 downto 2);
csr_write_valid <= wb_in.we and wb_in.sel(0); wb_ctrl_dat_w <= wb_in.dat(31 downto 0);
csr_port0_adr <= wb_in.adr(15 downto 2) when wb_is_csr = '1' else (others => '0'); wb_ctrl_sel <= wb_in.sel(3 downto 0);
csr_port0_dat_w <= wb_in.dat(31 downto 0); wb_ctrl_cyc <= wb_in.cyc and wb_is_ctrl;
csr_port0_we <= (csr_valid and csr_write_valid) when state = CMD else '0'; wb_ctrl_stb <= wb_in.stb and wb_is_ctrl;
wb_ctrl_we <= wb_in.we;


-- Wishbone out signals -- Wishbone out signals
wb_out.ack <= '1' when state = CSR else wb_out.ack <= wb_ctrl_ack when wb_is_ctrl ='1' else
wb_init_out.ack when wb_is_init = '1' else wb_init_out.ack when wb_is_init = '1' else
user_port0_wdata_ready when state = MWRITE else user_port0_wdata_ready when state = MWRITE else
user_port0_rdata_valid when state = MREAD else '0'; user_port0_rdata_valid when state = MREAD else '0';


csr_port_read_comb <= x"00000000" & csr_port0_dat_r; wb_out.dat <= (x"00000000" & wb_ctrl_dat_r) when wb_is_ctrl = '1' else
wb_out.dat <= csr_port_read_comb when wb_is_csr = '1' else
wb_init_out.dat when wb_is_init = '1' else wb_init_out.dat when wb_is_init = '1' else
user_port0_rdata_data(127 downto 64) when ad3 = '1' else user_port0_rdata_data(127 downto 64) when ad3 = '1' else
user_port0_rdata_data(63 downto 0); user_port0_rdata_data(63 downto 0);
@ -239,9 +247,7 @@ begin
else else
case state is case state is
when CMD => when CMD =>
if csr_valid = '1' then if (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= CSR;
elsif (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= MWRITE when wb_in.we = '1' else MREAD; state <= MWRITE when wb_in.we = '1' else MREAD;
end if; end if;
when MWRITE => when MWRITE =>
@ -252,8 +258,6 @@ begin
if user_port0_rdata_valid = '1' then if user_port0_rdata_valid = '1' then
state <= CMD; state <= CMD;
end if; end if;
when CSR =>
state <= CMD;
end case; end case;
end if; end if;
end if; end if;
@ -283,10 +287,17 @@ begin
init_error => init_error, init_error => init_error,
user_clk => system_clk, user_clk => system_clk,
user_rst => dram_user_reset, user_rst => dram_user_reset,
csr_port0_adr => csr_port0_adr, wb_ctrl_adr => wb_ctrl_adr,
csr_port0_we => csr_port0_we, wb_ctrl_dat_w => wb_ctrl_dat_w,
csr_port0_dat_w => csr_port0_dat_w, wb_ctrl_dat_r => wb_ctrl_dat_r,
csr_port0_dat_r => csr_port0_dat_r, wb_ctrl_sel => wb_ctrl_sel,
wb_ctrl_cyc => wb_ctrl_cyc,
wb_ctrl_stb => wb_ctrl_stb,
wb_ctrl_ack => wb_ctrl_ack,
wb_ctrl_we => wb_ctrl_we,
wb_ctrl_cti => "000",
wb_ctrl_bte => "00",
wb_ctrl_err => open,
user_port_native_0_cmd_valid => user_port0_cmd_valid, user_port_native_0_cmd_valid => user_port0_cmd_valid,
user_port_native_0_cmd_ready => user_port0_cmd_ready, user_port_native_0_cmd_ready => user_port0_cmd_ready,
user_port_native_0_cmd_we => user_port0_cmd_we, user_port_native_0_cmd_we => user_port0_cmd_we,

8
litedram/gen-src/wrapper-self-init.vhdl
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@ -25,7 +25,7 @@ entity litedram_wrapper is
-- Wishbone ports: -- Wishbone ports:
wb_in : in wishbone_master_out; wb_in : in wishbone_master_out;
wb_out : out wishbone_slave_out; wb_out : out wishbone_slave_out;
wb_is_csr : in std_ulogic; wb_is_ctrl : in std_ulogic;
wb_is_init : in std_ulogic; wb_is_init : in std_ulogic;


-- Init core serial debug -- Init core serial debug
@ -123,7 +123,7 @@ begin
ad3 <= wb_in.adr(3); ad3 <= wb_in.adr(3);


-- DRAM interface signals -- DRAM interface signals
user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_csr and not wb_is_init) user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_ctrl and not wb_is_init)
when state = CMD else '0'; when state = CMD else '0';
user_port0_cmd_we <= wb_in.we when state = CMD else '0'; user_port0_cmd_we <= wb_in.we when state = CMD else '0';
user_port0_wdata_valid <= '1' when state = MWRITE else '0'; user_port0_wdata_valid <= '1' when state = MWRITE else '0';
@ -134,10 +134,10 @@ begin
"00000000" & wb_in.sel; "00000000" & wb_in.sel;


-- Wishbone out signals. CSR and init memory do nothing, just ack -- Wishbone out signals. CSR and init memory do nothing, just ack
wb_out.ack <= '1' when (wb_is_csr = '1' or wb_is_init = '1') else wb_out.ack <= '1' when (wb_is_ctrl = '1' or wb_is_init = '1') else
user_port0_wdata_ready when state = MWRITE else user_port0_wdata_ready when state = MWRITE else
user_port0_rdata_valid when state = MREAD else '0'; user_port0_rdata_valid when state = MREAD else '0';
wb_out.dat <= (others => '0') when (wb_is_csr = '1' or wb_is_init = '1') else wb_out.dat <= (others => '0') when (wb_is_ctrl = '1' or wb_is_init = '1') else
user_port0_rdata_data(127 downto 64) when ad3 = '1' else user_port0_rdata_data(127 downto 64) when ad3 = '1' else
user_port0_rdata_data(63 downto 0); user_port0_rdata_data(63 downto 0);
wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack; wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack;

86
litedram/generated/arty/litedram-wrapper.vhdl
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@ -25,7 +25,7 @@ entity litedram_wrapper is
-- Wishbone ports: -- Wishbone ports:
wb_in : in wishbone_master_out; wb_in : in wishbone_master_out;
wb_out : out wishbone_slave_out; wb_out : out wishbone_slave_out;
wb_is_csr : in std_ulogic; wb_is_ctrl : in std_ulogic;
wb_is_init : in std_ulogic; wb_is_init : in std_ulogic;


-- Init core serial debug -- Init core serial debug
@ -80,10 +80,17 @@ architecture behaviour of litedram_wrapper is
init_error : out std_ulogic; init_error : out std_ulogic;
user_clk : out std_ulogic; user_clk : out std_ulogic;
user_rst : out std_ulogic; user_rst : out std_ulogic;
csr_port0_adr : in std_ulogic_vector(13 downto 0); wb_ctrl_adr : in std_ulogic_vector(29 downto 0);
csr_port0_we : in std_ulogic; wb_ctrl_dat_w : in std_ulogic_vector(31 downto 0);
csr_port0_dat_w : in std_ulogic_vector(31 downto 0); wb_ctrl_dat_r : out std_ulogic_vector(31 downto 0);
csr_port0_dat_r : out std_ulogic_vector(31 downto 0); wb_ctrl_sel : in std_ulogic_vector(3 downto 0);
wb_ctrl_cyc : in std_ulogic;
wb_ctrl_stb : in std_ulogic;
wb_ctrl_ack : out std_ulogic;
wb_ctrl_we : in std_ulogic;
wb_ctrl_cti : in std_ulogic_vector(2 downto 0);
wb_ctrl_bte : in std_ulogic_vector(1 downto 0);
wb_ctrl_err : out std_ulogic;
user_port_native_0_cmd_valid : in std_ulogic; user_port_native_0_cmd_valid : in std_ulogic;
user_port_native_0_cmd_ready : out std_ulogic; user_port_native_0_cmd_ready : out std_ulogic;
user_port_native_0_cmd_we : in std_ulogic; user_port_native_0_cmd_we : in std_ulogic;
@ -112,20 +119,19 @@ architecture behaviour of litedram_wrapper is


signal ad3 : std_ulogic; signal ad3 : std_ulogic;


signal dram_user_reset : std_ulogic; signal wb_ctrl_adr : std_ulogic_vector(29 downto 0);

signal wb_ctrl_dat_w : std_ulogic_vector(31 downto 0);
signal csr_port0_adr : std_ulogic_vector(13 downto 0); signal wb_ctrl_dat_r : std_ulogic_vector(31 downto 0);
signal csr_port0_we : std_ulogic; signal wb_ctrl_sel : std_ulogic_vector(3 downto 0);
signal csr_port0_dat_w : std_ulogic_vector(31 downto 0); signal wb_ctrl_cyc : std_ulogic;
signal csr_port0_dat_r : std_ulogic_vector(31 downto 0); signal wb_ctrl_stb : std_ulogic;
signal csr_port_read_comb : std_ulogic_vector(63 downto 0); signal wb_ctrl_ack : std_ulogic;
signal csr_valid : std_ulogic; signal wb_ctrl_we : std_ulogic;
signal csr_write_valid : std_ulogic;


signal wb_init_in : wishbone_master_out; signal wb_init_in : wishbone_master_out;
signal wb_init_out : wishbone_slave_out; signal wb_init_out : wishbone_slave_out;


type state_t is (CMD, MWRITE, MREAD, CSR); type state_t is (CMD, MWRITE, MREAD);
signal state : state_t; signal state : state_t;


constant INIT_RAM_SIZE : integer := 16384; constant INIT_RAM_SIZE : integer := 16384;
@ -192,7 +198,7 @@ begin
ad3 <= wb_in.adr(3); ad3 <= wb_in.adr(3);


-- DRAM data interface signals -- DRAM data interface signals
user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_csr and not wb_is_init) user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_ctrl and not wb_is_init)
when state = CMD else '0'; when state = CMD else '0';
user_port0_cmd_we <= wb_in.we when state = CMD else '0'; user_port0_cmd_we <= wb_in.we when state = CMD else '0';
user_port0_wdata_valid <= '1' when state = MWRITE else '0'; user_port0_wdata_valid <= '1' when state = MWRITE else '0';
@ -202,31 +208,28 @@ begin
user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else
"00000000" & wb_in.sel; "00000000" & wb_in.sel;


-- DRAM CSR interface signals. We only support access to the bottom byte -- DRAM ctrl interface signals
csr_valid <= wb_in.cyc and wb_in.stb and wb_is_csr; wb_ctrl_adr <= x"0000" & wb_in.adr(15 downto 2);
csr_write_valid <= wb_in.we and wb_in.sel(0); wb_ctrl_dat_w <= wb_in.dat(31 downto 0);
csr_port0_adr <= wb_in.adr(15 downto 2) when wb_is_csr = '1' else (others => '0'); wb_ctrl_sel <= wb_in.sel(3 downto 0);
csr_port0_dat_w <= wb_in.dat(31 downto 0); wb_ctrl_cyc <= wb_in.cyc and wb_is_ctrl;
csr_port0_we <= (csr_valid and csr_write_valid) when state = CMD else '0'; wb_ctrl_stb <= wb_in.stb and wb_is_ctrl;
wb_ctrl_we <= wb_in.we;


-- Wishbone out signals -- Wishbone out signals
wb_out.ack <= '1' when state = CSR else wb_out.ack <= wb_ctrl_ack when wb_is_ctrl ='1' else
wb_init_out.ack when wb_is_init = '1' else wb_init_out.ack when wb_is_init = '1' else
user_port0_wdata_ready when state = MWRITE else user_port0_wdata_ready when state = MWRITE else
user_port0_rdata_valid when state = MREAD else '0'; user_port0_rdata_valid when state = MREAD else '0';


csr_port_read_comb <= x"00000000" & csr_port0_dat_r; wb_out.dat <= (x"00000000" & wb_ctrl_dat_r) when wb_is_ctrl = '1' else
wb_out.dat <= csr_port_read_comb when wb_is_csr = '1' else
wb_init_out.dat when wb_is_init = '1' else wb_init_out.dat when wb_is_init = '1' else
user_port0_rdata_data(127 downto 64) when ad3 = '1' else user_port0_rdata_data(127 downto 64) when ad3 = '1' else
user_port0_rdata_data(63 downto 0); user_port0_rdata_data(63 downto 0);
-- We don't do pipelining yet. -- We don't do pipelining yet.
wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack; wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack;


-- Reset ignored, the reset controller use the pll lock signal, -- Use alternate core reset address set when DRAM is not initialized.
-- and alternate core reset address set when DRAM is not initialized.
--
system_reset <= '0';
core_alt_reset <= not init_done; core_alt_reset <= not init_done;


-- State machine -- State machine
@ -234,14 +237,12 @@ begin
begin begin
if rising_edge(system_clk) then if rising_edge(system_clk) then
if dram_user_reset = '1' then if system_reset = '1' then
state <= CMD; state <= CMD;
else else
case state is case state is
when CMD => when CMD =>
if csr_valid = '1' then if (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= CSR;
elsif (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= MWRITE when wb_in.we = '1' else MREAD; state <= MWRITE when wb_in.we = '1' else MREAD;
end if; end if;
when MWRITE => when MWRITE =>
@ -252,8 +253,6 @@ begin
if user_port0_rdata_valid = '1' then if user_port0_rdata_valid = '1' then
state <= CMD; state <= CMD;
end if; end if;
when CSR =>
state <= CMD;
end case; end case;
end if; end if;
end if; end if;
@ -282,11 +281,18 @@ begin
init_done => init_done, init_done => init_done,
init_error => init_error, init_error => init_error,
user_clk => system_clk, user_clk => system_clk,
user_rst => dram_user_reset, user_rst => system_reset,
csr_port0_adr => csr_port0_adr, wb_ctrl_adr => wb_ctrl_adr,
csr_port0_we => csr_port0_we, wb_ctrl_dat_w => wb_ctrl_dat_w,
csr_port0_dat_w => csr_port0_dat_w, wb_ctrl_dat_r => wb_ctrl_dat_r,
csr_port0_dat_r => csr_port0_dat_r, wb_ctrl_sel => wb_ctrl_sel,
wb_ctrl_cyc => wb_ctrl_cyc,
wb_ctrl_stb => wb_ctrl_stb,
wb_ctrl_ack => wb_ctrl_ack,
wb_ctrl_we => wb_ctrl_we,
wb_ctrl_cti => "000",
wb_ctrl_bte => "00",
wb_ctrl_err => open,
user_port_native_0_cmd_valid => user_port0_cmd_valid, user_port_native_0_cmd_valid => user_port0_cmd_valid,
user_port_native_0_cmd_ready => user_port0_cmd_ready, user_port_native_0_cmd_ready => user_port0_cmd_ready,
user_port_native_0_cmd_we => user_port0_cmd_we, user_port_native_0_cmd_we => user_port0_cmd_we,

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litedram/generated/arty/litedram_core.init
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litedram/generated/arty/litedram_core.v
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86
litedram/generated/nexys-video/litedram-wrapper.vhdl
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@ -25,7 +25,7 @@ entity litedram_wrapper is
-- Wishbone ports: -- Wishbone ports:
wb_in : in wishbone_master_out; wb_in : in wishbone_master_out;
wb_out : out wishbone_slave_out; wb_out : out wishbone_slave_out;
wb_is_csr : in std_ulogic; wb_is_ctrl : in std_ulogic;
wb_is_init : in std_ulogic; wb_is_init : in std_ulogic;


-- Init core serial debug -- Init core serial debug
@ -80,10 +80,17 @@ architecture behaviour of litedram_wrapper is
init_error : out std_ulogic; init_error : out std_ulogic;
user_clk : out std_ulogic; user_clk : out std_ulogic;
user_rst : out std_ulogic; user_rst : out std_ulogic;
csr_port0_adr : in std_ulogic_vector(13 downto 0); wb_ctrl_adr : in std_ulogic_vector(29 downto 0);
csr_port0_we : in std_ulogic; wb_ctrl_dat_w : in std_ulogic_vector(31 downto 0);
csr_port0_dat_w : in std_ulogic_vector(31 downto 0); wb_ctrl_dat_r : out std_ulogic_vector(31 downto 0);
csr_port0_dat_r : out std_ulogic_vector(31 downto 0); wb_ctrl_sel : in std_ulogic_vector(3 downto 0);
wb_ctrl_cyc : in std_ulogic;
wb_ctrl_stb : in std_ulogic;
wb_ctrl_ack : out std_ulogic;
wb_ctrl_we : in std_ulogic;
wb_ctrl_cti : in std_ulogic_vector(2 downto 0);
wb_ctrl_bte : in std_ulogic_vector(1 downto 0);
wb_ctrl_err : out std_ulogic;
user_port_native_0_cmd_valid : in std_ulogic; user_port_native_0_cmd_valid : in std_ulogic;
user_port_native_0_cmd_ready : out std_ulogic; user_port_native_0_cmd_ready : out std_ulogic;
user_port_native_0_cmd_we : in std_ulogic; user_port_native_0_cmd_we : in std_ulogic;
@ -112,20 +119,19 @@ architecture behaviour of litedram_wrapper is


signal ad3 : std_ulogic; signal ad3 : std_ulogic;


signal dram_user_reset : std_ulogic; signal wb_ctrl_adr : std_ulogic_vector(29 downto 0);

signal wb_ctrl_dat_w : std_ulogic_vector(31 downto 0);
signal csr_port0_adr : std_ulogic_vector(13 downto 0); signal wb_ctrl_dat_r : std_ulogic_vector(31 downto 0);
signal csr_port0_we : std_ulogic; signal wb_ctrl_sel : std_ulogic_vector(3 downto 0);
signal csr_port0_dat_w : std_ulogic_vector(31 downto 0); signal wb_ctrl_cyc : std_ulogic;
signal csr_port0_dat_r : std_ulogic_vector(31 downto 0); signal wb_ctrl_stb : std_ulogic;
signal csr_port_read_comb : std_ulogic_vector(63 downto 0); signal wb_ctrl_ack : std_ulogic;
signal csr_valid : std_ulogic; signal wb_ctrl_we : std_ulogic;
signal csr_write_valid : std_ulogic;


signal wb_init_in : wishbone_master_out; signal wb_init_in : wishbone_master_out;
signal wb_init_out : wishbone_slave_out; signal wb_init_out : wishbone_slave_out;


type state_t is (CMD, MWRITE, MREAD, CSR); type state_t is (CMD, MWRITE, MREAD);
signal state : state_t; signal state : state_t;


constant INIT_RAM_SIZE : integer := 16384; constant INIT_RAM_SIZE : integer := 16384;
@ -192,7 +198,7 @@ begin
ad3 <= wb_in.adr(3); ad3 <= wb_in.adr(3);


-- DRAM data interface signals -- DRAM data interface signals
user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_csr and not wb_is_init) user_port0_cmd_valid <= (wb_in.cyc and wb_in.stb and not wb_is_ctrl and not wb_is_init)
when state = CMD else '0'; when state = CMD else '0';
user_port0_cmd_we <= wb_in.we when state = CMD else '0'; user_port0_cmd_we <= wb_in.we when state = CMD else '0';
user_port0_wdata_valid <= '1' when state = MWRITE else '0'; user_port0_wdata_valid <= '1' when state = MWRITE else '0';
@ -202,31 +208,28 @@ begin
user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else user_port0_wdata_we <= wb_in.sel & "00000000" when ad3 = '1' else
"00000000" & wb_in.sel; "00000000" & wb_in.sel;


-- DRAM CSR interface signals. We only support access to the bottom byte -- DRAM ctrl interface signals
csr_valid <= wb_in.cyc and wb_in.stb and wb_is_csr; wb_ctrl_adr <= x"0000" & wb_in.adr(15 downto 2);
csr_write_valid <= wb_in.we and wb_in.sel(0); wb_ctrl_dat_w <= wb_in.dat(31 downto 0);
csr_port0_adr <= wb_in.adr(15 downto 2) when wb_is_csr = '1' else (others => '0'); wb_ctrl_sel <= wb_in.sel(3 downto 0);
csr_port0_dat_w <= wb_in.dat(31 downto 0); wb_ctrl_cyc <= wb_in.cyc and wb_is_ctrl;
csr_port0_we <= (csr_valid and csr_write_valid) when state = CMD else '0'; wb_ctrl_stb <= wb_in.stb and wb_is_ctrl;
wb_ctrl_we <= wb_in.we;


-- Wishbone out signals -- Wishbone out signals
wb_out.ack <= '1' when state = CSR else wb_out.ack <= wb_ctrl_ack when wb_is_ctrl ='1' else
wb_init_out.ack when wb_is_init = '1' else wb_init_out.ack when wb_is_init = '1' else
user_port0_wdata_ready when state = MWRITE else user_port0_wdata_ready when state = MWRITE else
user_port0_rdata_valid when state = MREAD else '0'; user_port0_rdata_valid when state = MREAD else '0';


csr_port_read_comb <= x"00000000" & csr_port0_dat_r; wb_out.dat <= (x"00000000" & wb_ctrl_dat_r) when wb_is_ctrl = '1' else
wb_out.dat <= csr_port_read_comb when wb_is_csr = '1' else
wb_init_out.dat when wb_is_init = '1' else wb_init_out.dat when wb_is_init = '1' else
user_port0_rdata_data(127 downto 64) when ad3 = '1' else user_port0_rdata_data(127 downto 64) when ad3 = '1' else
user_port0_rdata_data(63 downto 0); user_port0_rdata_data(63 downto 0);
-- We don't do pipelining yet. -- We don't do pipelining yet.
wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack; wb_out.stall <= '0' when wb_in.cyc = '0' else not wb_out.ack;


-- Reset ignored, the reset controller use the pll lock signal, -- Use alternate core reset address set when DRAM is not initialized.
-- and alternate core reset address set when DRAM is not initialized.
--
system_reset <= '0';
core_alt_reset <= not init_done; core_alt_reset <= not init_done;


-- State machine -- State machine
@ -234,14 +237,12 @@ begin
begin begin
if rising_edge(system_clk) then if rising_edge(system_clk) then
if dram_user_reset = '1' then if system_reset = '1' then
state <= CMD; state <= CMD;
else else
case state is case state is
when CMD => when CMD =>
if csr_valid = '1' then if (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= CSR;
elsif (user_port0_cmd_ready and user_port0_cmd_valid) = '1' then
state <= MWRITE when wb_in.we = '1' else MREAD; state <= MWRITE when wb_in.we = '1' else MREAD;
end if; end if;
when MWRITE => when MWRITE =>
@ -252,8 +253,6 @@ begin
if user_port0_rdata_valid = '1' then if user_port0_rdata_valid = '1' then
state <= CMD; state <= CMD;
end if; end if;
when CSR =>
state <= CMD;
end case; end case;
end if; end if;
end if; end if;
@ -282,11 +281,18 @@ begin
init_done => init_done, init_done => init_done,
init_error => init_error, init_error => init_error,
user_clk => system_clk, user_clk => system_clk,
user_rst => dram_user_reset, user_rst => system_reset,
csr_port0_adr => csr_port0_adr, wb_ctrl_adr => wb_ctrl_adr,
csr_port0_we => csr_port0_we, wb_ctrl_dat_w => wb_ctrl_dat_w,
csr_port0_dat_w => csr_port0_dat_w, wb_ctrl_dat_r => wb_ctrl_dat_r,
csr_port0_dat_r => csr_port0_dat_r, wb_ctrl_sel => wb_ctrl_sel,
wb_ctrl_cyc => wb_ctrl_cyc,
wb_ctrl_stb => wb_ctrl_stb,
wb_ctrl_ack => wb_ctrl_ack,
wb_ctrl_we => wb_ctrl_we,
wb_ctrl_cti => "000",
wb_ctrl_bte => "00",
wb_ctrl_err => open,
user_port_native_0_cmd_valid => user_port0_cmd_valid, user_port_native_0_cmd_valid => user_port0_cmd_valid,
user_port_native_0_cmd_ready => user_port0_cmd_ready, user_port_native_0_cmd_ready => user_port0_cmd_ready,
user_port_native_0_cmd_we => user_port0_cmd_we, user_port_native_0_cmd_we => user_port0_cmd_we,

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litedram/generated/nexys-video/litedram_core.init
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litedram/generated/nexys-video/litedram_core.v
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14
soc.vhdl
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@ -17,7 +17,7 @@ use work.wishbone_types.all;
-- 0xc0000000: SYSCON -- 0xc0000000: SYSCON
-- 0xc0002000: UART0 -- 0xc0002000: UART0
-- 0xc0004000: XICS ICP -- 0xc0004000: XICS ICP
-- 0xc0100000: DRAM CSRs -- 0xc0100000: LiteDRAM control (CSRs)
-- 0xf0000000: Block RAM (aliased & repeated) -- 0xf0000000: Block RAM (aliased & repeated)
-- 0xffff0000: DRAM init code (if any) -- 0xffff0000: DRAM init code (if any)


@ -39,7 +39,7 @@ entity soc is
-- DRAM controller signals -- DRAM controller signals
wb_dram_in : out wishbone_master_out; wb_dram_in : out wishbone_master_out;
wb_dram_out : in wishbone_slave_out; wb_dram_out : in wishbone_slave_out;
wb_dram_csr : out std_ulogic; wb_dram_ctrl : out std_ulogic;
wb_dram_init : out std_ulogic; wb_dram_init : out std_ulogic;


-- UART0 signals: -- UART0 signals:
@ -162,7 +162,7 @@ begin
SLAVE_BRAM, SLAVE_BRAM,
SLAVE_DRAM, SLAVE_DRAM,
SLAVE_DRAM_INIT, SLAVE_DRAM_INIT,
SLAVE_DRAM_CSR, SLAVE_DRAM_CTRL,
SLAVE_ICP_0, SLAVE_ICP_0,
SLAVE_NONE); SLAVE_NONE);
variable slave : slave_type; variable slave : slave_type;
@ -185,7 +185,7 @@ begin
elsif std_match(wb_master_out.adr, x"C0002---") then elsif std_match(wb_master_out.adr, x"C0002---") then
slave := SLAVE_UART; slave := SLAVE_UART;
elsif std_match(wb_master_out.adr, x"C01-----") then elsif std_match(wb_master_out.adr, x"C01-----") then
slave := SLAVE_DRAM_CSR; slave := SLAVE_DRAM_CTRL;
elsif std_match(wb_master_out.adr, x"C0004---") then elsif std_match(wb_master_out.adr, x"C0004---") then
slave := SLAVE_ICP_0; slave := SLAVE_ICP_0;
end if; end if;
@ -204,7 +204,7 @@ begin


wb_dram_in <= wb_master_out; wb_dram_in <= wb_master_out;
wb_dram_in.cyc <= '0'; wb_dram_in.cyc <= '0';
wb_dram_csr <= '0'; wb_dram_ctrl <= '0';
wb_dram_init <= '0'; wb_dram_init <= '0';
wb_syscon_in <= wb_master_out; wb_syscon_in <= wb_master_out;
wb_syscon_in.cyc <= '0'; wb_syscon_in.cyc <= '0';
@ -219,10 +219,10 @@ begin
wb_dram_in.cyc <= wb_master_out.cyc; wb_dram_in.cyc <= wb_master_out.cyc;
wb_master_in <= wb_dram_out; wb_master_in <= wb_dram_out;
wb_dram_init <= '1'; wb_dram_init <= '1';
when SLAVE_DRAM_CSR => when SLAVE_DRAM_CTRL =>
wb_dram_in.cyc <= wb_master_out.cyc; wb_dram_in.cyc <= wb_master_out.cyc;
wb_master_in <= wb_dram_out; wb_master_in <= wb_dram_out;
wb_dram_csr <= '1'; wb_dram_ctrl <= '1';
when SLAVE_SYSCON => when SLAVE_SYSCON =>
wb_syscon_in.cyc <= wb_master_out.cyc; wb_syscon_in.cyc <= wb_master_out.cyc;
wb_master_in <= wb_syscon_out; wb_master_in <= wb_syscon_out;

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