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// SPDX-License-Identifier: GPL-2.0-or-later
/***************************************************************************
* Copyright (C) 2022 by Daniel Anselmi *
* danselmi@gmx.ch *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <jtag/jtag.h>
#include <jtag/adapter.h>
#include <helper/bits.h>
#include "pld.h"
#include "raw_bit.h"
#define NO_OP 0x02
#define ERASE_SRAM 0x05
#define SRAM_ERASE_DONE 0x09
#define IDCODE 0x11
#define ADDRESS_INITIALIZATION 0x12
#define READ_USERCODE 0x13
#define CONFIG_ENABLE 0x15
#define TRANSFER_CONFIGURATION_DATA 0x17
#define CONFIG_DISABLE 0x3A
#define RELOAD 0x3C
#define STATUS_REGISTER 0x41
#define ERASE_FLASH 0x75
#define ENABLE_2ND_FLASH 0x78
#define USER1 0x42
#define USER2 0x43
#define STAUS_MASK_MEMORY_ERASE BIT(5)
#define STAUS_MASK_SYSTEM_EDIT_MODE BIT(7)
struct gowin_pld_device {
struct jtag_tap *tap;
};
struct gowin_bit_file {
struct raw_bit_file raw_file;
size_t capacity;
uint32_t id;
uint16_t stored_checksum;
int compressed;
int crc_en;
uint16_t checksum;
uint8_t replace8x;
uint8_t replace4x;
uint8_t replace2x;
};
static uint64_t gowin_read_fs_file_bitsequence(const char *bits, int length)
{
uint64_t res = 0;
for (int i = 0; i < length; i++)
res = (res << 1) | (*bits++ == '1' ? 1 : 0);
return res;
}
static int gowin_add_byte_to_bit_file(struct gowin_bit_file *bit_file, uint8_t byte)
{
if (bit_file->raw_file.length + 1 > bit_file->capacity) {
uint8_t *buffer;
if (bit_file->raw_file.data)
buffer = realloc(bit_file->raw_file.data, bit_file->capacity + 8192);
else
buffer = malloc(8192);
if (!buffer) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
bit_file->raw_file.data = buffer;
bit_file->capacity += 8192;
}
bit_file->raw_file.data[bit_file->raw_file.length++] = byte;
return ERROR_OK;
}
static int gowin_read_fs_file_header(struct gowin_bit_file *bit_file, FILE *stream)
{
if (!bit_file)
return ERROR_FAIL;
int end_of_header = 0;
while (!end_of_header) {
char buffer[256];
char *line = fgets(buffer, 256, stream);
if (!line || feof(stream) || ferror(stream))
return ERROR_FAIL;
if (line[0] == '/')
continue;
size_t line_length = strlen(line);
if (line[line_length - 1] != '\n')
return ERROR_FAIL;
line_length--;
for (unsigned int i = 0; i < line_length; i += 8) {
uint8_t byte = gowin_read_fs_file_bitsequence(line + i, 8);
int retval = gowin_add_byte_to_bit_file(bit_file, byte);
if (retval != ERROR_OK)
return retval;
}
uint8_t key = gowin_read_fs_file_bitsequence(line, 8);
line += 8;
uint64_t value = gowin_read_fs_file_bitsequence(line, line_length - 8);
if (key == 0x06) {
bit_file->id = value & 0xffffffff;
} else if (key == 0x3B) {
end_of_header = 1;
bit_file->crc_en = (value & BIT(23)) ? 1 : 0;
}
}
return ERROR_OK;
}
static int gowin_read_fs_file(struct gowin_bit_file *bit_file, const char *filename)
{
FILE *input_file = fopen(filename, "r");
if (!input_file) {
LOG_ERROR("Couldn't open %s: %s", filename, strerror(errno));
return ERROR_PLD_FILE_LOAD_FAILED;
}
int retval = gowin_read_fs_file_header(bit_file, input_file);
if (retval != ERROR_OK) {
free(bit_file->raw_file.data);
fclose(input_file);
return retval;
}
char digits_buffer[9]; /* 8 + 1 trailing zero */
do {
char *digits = fgets(digits_buffer, 9, input_file);
if (feof(input_file))
break;
if (!digits || ferror(input_file)) {
free(bit_file->raw_file.data);
fclose(input_file);
return ERROR_FAIL;
}
if (digits[0] == '\n')
continue;
if (strlen(digits) != 8) {
free(bit_file->raw_file.data);
fclose(input_file);
return ERROR_FAIL;
}
uint8_t byte = gowin_read_fs_file_bitsequence(digits, 8);
retval = gowin_add_byte_to_bit_file(bit_file, byte);
if (retval != ERROR_OK) {
free(bit_file->raw_file.data);
fclose(input_file);
return ERROR_FAIL;
}
} while (1);
fclose(input_file);
return ERROR_OK;
}
static int gowin_read_file(struct gowin_bit_file *bit_file, const char *filename, bool *is_fs)
{
memset(bit_file, 0, sizeof(struct gowin_bit_file));
if (!filename || !bit_file)
return ERROR_COMMAND_SYNTAX_ERROR;
const char *file_suffix_pos = strrchr(filename, '.');
if (!file_suffix_pos) {
LOG_ERROR("Unable to detect filename suffix");
return ERROR_PLD_FILE_LOAD_FAILED;
}
/* check if binary .bin or ascii .fs */
if (strcasecmp(file_suffix_pos, ".bin") == 0) {
*is_fs = false;
return cpld_read_raw_bit_file(&bit_file->raw_file, filename);
} else if (strcasecmp(file_suffix_pos, ".fs") == 0) {
*is_fs = true;
return gowin_read_fs_file(bit_file, filename);
}
LOG_ERROR("Filetype not supported, expecting .fs or .bin file");
return ERROR_PLD_FILE_LOAD_FAILED;
}
static int gowin_set_instr(struct jtag_tap *tap, uint8_t new_instr)
{
struct scan_field field;
field.num_bits = tap->ir_length;
void *t = calloc(DIV_ROUND_UP(field.num_bits, 8), 1);
if (!t) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
field.out_value = t;
buf_set_u32(t, 0, field.num_bits, new_instr);
field.in_value = NULL;
jtag_add_ir_scan(tap, &field, TAP_IDLE);
jtag_add_runtest(3, TAP_IDLE);
free(t);
return ERROR_OK;
}
static int gowin_read_register(struct jtag_tap *tap, uint32_t reg, uint32_t *result)
{
struct scan_field field;
int retval = gowin_set_instr(tap, reg);
if (retval != ERROR_OK)
return retval;
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
uint8_t buf[4] = {0};
field.check_mask = NULL;
field.check_value = NULL;
field.num_bits = 32;
field.out_value = buf;
field.in_value = buf;
jtag_add_dr_scan(tap, 1, &field, TAP_IDLE);
retval = jtag_execute_queue();
*result = le_to_h_u32(buf);
return retval;
}
static int gowin_check_status_flag(struct jtag_tap *tap, uint32_t mask, uint32_t flag)
{
uint32_t status = 0;
int retries = 0;
do {
int retval = gowin_read_register(tap, STATUS_REGISTER, &status);
if (retval != ERROR_OK)
return retval;
if (retries++ == 100000)
return ERROR_FAIL;
} while ((status & mask) != flag);
return ERROR_OK;
}
static int gowin_enable_config(struct jtag_tap *tap)
{
int retval = gowin_set_instr(tap, CONFIG_ENABLE);
if (retval != ERROR_OK)
return retval;
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
return gowin_check_status_flag(tap, STAUS_MASK_SYSTEM_EDIT_MODE, STAUS_MASK_SYSTEM_EDIT_MODE);
}
static int gowin_disable_config(struct jtag_tap *tap)
{
int retval = gowin_set_instr(tap, CONFIG_DISABLE);
if (retval != ERROR_OK)
return retval;
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
return gowin_check_status_flag(tap, STAUS_MASK_SYSTEM_EDIT_MODE, 0);
}
static int gowin_reload(struct jtag_tap *tap)
{
int retval = gowin_set_instr(tap, RELOAD);
if (retval != ERROR_OK)
return retval;
retval = gowin_set_instr(tap, NO_OP);
if (retval != ERROR_OK)
return retval;
return jtag_execute_queue();
}
static int gowin_runtest_idle(struct jtag_tap *tap, unsigned int frac_sec)
{
int speed = adapter_get_speed_khz() * 1000;
int cycles = DIV_ROUND_UP(speed, frac_sec);
jtag_add_runtest(cycles, TAP_IDLE);
return jtag_execute_queue();
}
static int gowin_erase_sram(struct jtag_tap *tap, bool tx_erase_done)
{
/* config is already enabled */
int retval = gowin_set_instr(tap, ERASE_SRAM);
if (retval != ERROR_OK)
return retval;
retval = gowin_set_instr(tap, NO_OP);
if (retval != ERROR_OK)
return retval;
/* Delay or Run Test 2~10ms */
/* 10 ms is worst case for GW2A-55 */
jtag_add_sleep(10000);
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
retval = gowin_check_status_flag(tap, STAUS_MASK_MEMORY_ERASE,
STAUS_MASK_MEMORY_ERASE);
if (retval != ERROR_OK)
return retval;
if (tx_erase_done) {
retval = gowin_set_instr(tap, SRAM_ERASE_DONE);
if (retval != ERROR_OK)
return retval;
retval = gowin_set_instr(tap, NO_OP);
if (retval != ERROR_OK)
return retval;
retval = jtag_execute_queue();
if (retval != ERROR_OK)
return retval;
/* gen clock cycles in RUN/IDLE for 500us -> 1/500us = 2000/s */
retval = gowin_runtest_idle(tap, 2000);
if (retval != ERROR_OK)
return retval;
}
retval = gowin_set_instr(tap, NO_OP);
if (retval != ERROR_OK)
return retval;
return jtag_execute_queue();
}
static int gowin_load_to_sram(struct pld_device *pld_device, const char *filename)
{
if (!pld_device)
return ERROR_FAIL;
struct gowin_pld_device *gowin_info = pld_device->driver_priv;
if (!gowin_info || !gowin_info->tap)
return ERROR_FAIL;
struct jtag_tap *tap = gowin_info->tap;
bool is_fs = false;
struct gowin_bit_file bit_file;
int retval = gowin_read_file(&bit_file, filename, &is_fs);
if (retval != ERROR_OK)
return retval;
for (unsigned int i = 0; i < bit_file.raw_file.length; i++)
bit_file.raw_file.data[i] = flip_u32(bit_file.raw_file.data[i], 8);
uint32_t id;
retval = gowin_read_register(tap, IDCODE, &id);
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
if (is_fs && id != bit_file.id) {
free(bit_file.raw_file.data);
LOG_ERROR("Id on device (0x%8.8" PRIx32 ") and id in bit-stream (0x%8.8" PRIx32 ") don't match.",
id, bit_file.id);
return ERROR_FAIL;
}
retval = gowin_enable_config(tap);
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
retval = gowin_erase_sram(tap, false);
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
retval = gowin_set_instr(tap, ADDRESS_INITIALIZATION);
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
retval = gowin_set_instr(tap, TRANSFER_CONFIGURATION_DATA);
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
/* scan out the bitstream */
struct scan_field field;
field.num_bits = bit_file.raw_file.length * 8;
field.out_value = bit_file.raw_file.data;
field.in_value = bit_file.raw_file.data;
jtag_add_dr_scan(gowin_info->tap, 1, &field, TAP_IDLE);
jtag_add_runtest(3, TAP_IDLE);
retval = jtag_execute_queue();
if (retval != ERROR_OK) {
free(bit_file.raw_file.data);
return retval;
}
retval = gowin_disable_config(tap);
free(bit_file.raw_file.data);
if (retval != ERROR_OK)
return retval;
retval = gowin_set_instr(gowin_info->tap, NO_OP);
if (retval != ERROR_OK)
return retval;
retval = jtag_execute_queue();
return retval;
}
static int gowin_read_register_command(struct pld_device *pld_device, uint32_t cmd, uint32_t *value)
{
if (!pld_device)
return ERROR_FAIL;
struct gowin_pld_device *gowin_info = pld_device->driver_priv;
if (!gowin_info || !gowin_info->tap)
return ERROR_FAIL;
return gowin_read_register(gowin_info->tap, cmd, value);
}
static int gowin_reload_command(struct pld_device *pld_device)
{
if (!pld_device)
return ERROR_FAIL;
struct gowin_pld_device *gowin_info = pld_device->driver_priv;
if (!gowin_info || !gowin_info->tap)
return ERROR_FAIL;
return gowin_reload(gowin_info->tap);
}
static int gowin_get_ipdbg_hub(int user_num, struct pld_device *pld_device, struct pld_ipdbg_hub *hub)
{
if (!pld_device)
return ERROR_FAIL;
struct gowin_pld_device *pld_device_info = pld_device->driver_priv;
if (!pld_device_info || !pld_device_info->tap)
return ERROR_FAIL;
hub->tap = pld_device_info->tap;
if (user_num == 1) {
hub->user_ir_code = USER1;
} else if (user_num == 2) {
hub->user_ir_code = USER2;
} else {
LOG_ERROR("gowin devices only have user register 1 & 2");
return ERROR_FAIL;
}
return ERROR_OK;
}
COMMAND_HANDLER(gowin_read_status_command_handler)
{
if (CMD_ARGC != 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct pld_device *device = get_pld_device_by_name_or_numstr(CMD_ARGV[0]);
if (!device) {
command_print(CMD, "pld device '#%s' is out of bounds or unknown", CMD_ARGV[0]);
return ERROR_FAIL;
}
uint32_t status = 0;
int retval = gowin_read_register_command(device, STATUS_REGISTER, &status);
if (retval == ERROR_OK)
command_print(CMD, "0x%8.8" PRIx32, status);
return retval;
}
COMMAND_HANDLER(gowin_read_user_register_command_handler)
{
if (CMD_ARGC != 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct pld_device *device = get_pld_device_by_name_or_numstr(CMD_ARGV[0]);
if (!device) {
command_print(CMD, "pld device '#%s' is out of bounds or unknown", CMD_ARGV[0]);
return ERROR_FAIL;
}
uint32_t user_reg = 0;
int retval = gowin_read_register_command(device, READ_USERCODE, &user_reg);
if (retval == ERROR_OK)
command_print(CMD, "0x%8.8" PRIx32, user_reg);
return retval;
}
COMMAND_HANDLER(gowin_reload_command_handler)
{
if (CMD_ARGC != 1)
return ERROR_COMMAND_SYNTAX_ERROR;
struct pld_device *device = get_pld_device_by_name_or_numstr(CMD_ARGV[0]);
if (!device) {
command_print(CMD, "pld device '#%s' is out of bounds or unknown", CMD_ARGV[0]);
return ERROR_FAIL;
}
return gowin_reload_command(device);
}
static const struct command_registration gowin_exec_command_handlers[] = {
{
.name = "read_status",
.mode = COMMAND_EXEC,
.handler = gowin_read_status_command_handler,
.help = "reading status register from FPGA",
.usage = "pld_name",
}, {
.name = "read_user",
.mode = COMMAND_EXEC,
.handler = gowin_read_user_register_command_handler,
.help = "reading user register from FPGA",
.usage = "pld_name",
}, {
.name = "refresh",
.mode = COMMAND_EXEC,
.handler = gowin_reload_command_handler,
.help = "reload bitstream from flash to SRAM",
.usage = "pld_name",
},
COMMAND_REGISTRATION_DONE
};
static const struct command_registration gowin_command_handler[] = {
{
.name = "gowin",
.mode = COMMAND_ANY,
.help = "gowin specific commands",
.usage = "",
.chain = gowin_exec_command_handlers
},
COMMAND_REGISTRATION_DONE
};
PLD_CREATE_COMMAND_HANDLER(gowin_pld_create_command)
{
if (CMD_ARGC != 4)
return ERROR_COMMAND_SYNTAX_ERROR;
if (strcmp(CMD_ARGV[2], "-chain-position") != 0)
return ERROR_COMMAND_SYNTAX_ERROR;
struct jtag_tap *tap = jtag_tap_by_string(CMD_ARGV[3]);
if (!tap) {
command_print(CMD, "Tap: %s does not exist", CMD_ARGV[3]);
return ERROR_FAIL;
}
struct gowin_pld_device *gowin_info = malloc(sizeof(struct gowin_pld_device));
if (!gowin_info) {
LOG_ERROR("Out of memory");
return ERROR_FAIL;
}
gowin_info->tap = tap;
pld->driver_priv = gowin_info;
return ERROR_OK;
}
struct pld_driver gowin_pld = {
.name = "gowin",
.commands = gowin_command_handler,
.pld_create_command = &gowin_pld_create_command,
.load = &gowin_load_to_sram,
.get_ipdbg_hub = gowin_get_ipdbg_hub,
};
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