thodg/cgminer/driver-modminer.c

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• Hash : fc14b2ee
  Author :
  Date : 2012-10-17T09:56:42
  

  MMQ new initialisation (that works) and clocking control

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• driver-modminer.c

• /*
   * Copyright 2012 Andrew Smith
   * Copyright 2012 Luke Dashjr
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the Free
   * Software Foundation; either version 3 of the License, or (at your option)
   * any later version.  See COPYING for more details.
   */
  
  #include "config.h"
  
  #include <stdarg.h>
  #include <stdio.h>
  #include <unistd.h>
  #include <math.h>
  
  #include "logging.h"
  #include "miner.h"
  #include "fpgautils.h"
  #include "util.h"
  
  #define BITSTREAM_FILENAME "fpgaminer_top_fixed7_197MHz.ncd"
  #define BISTREAM_USER_ID "\2\4$B"
  
  #define MODMINER_CUTOFF_TEMP 60.0
  #define MODMINER_OVERHEAT_TEMP 50.0
  #define MODMINER_OVERHEAT_CLOCK -10
  
  #define MODMINER_HW_ERROR_PERCENT 0.75
  
  #define MODMINER_MAX_CLOCK 220
  #define MODMINER_DEF_CLOCK 200
  #define MODMINER_MIN_CLOCK 160
  
  #define MODMINER_CLOCK_DOWN -2
  #define MODMINER_CLOCK_SET 0
  #define MODMINER_CLOCK_UP 2
  
  // Maximum how many good shares in a row means clock up
  // 96 is ~34m22s at 200MH/s
  #define MODMINER_TRY_UP 96
  // Initially how many good shares in a row means clock up
  // This is doubled each down clock until it reaches MODMINER_TRY_UP
  // 6 is ~2m9s at 200MH/s
  #define MODMINER_EARLY_UP 6
  
  struct device_api modminer_api;
  
  static inline bool _bailout(int fd, struct cgpu_info *modminer, int prio, const char *fmt, ...)
  {
  	if (fd != -1)
  		serial_close(fd);
  	if (modminer) {
  		modminer->device_fd = -1;
  		mutex_unlock(&modminer->device_mutex);
  	}
  
  	va_list ap;
  	va_start(ap, fmt);
  	vapplog(prio, fmt, ap);
  	va_end(ap);
  	return false;
  }
  
  // 45 noops sent when detecting, in case the device was left in "start job" reading
  static const char NOOP[] = "\0\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff";
  
  static bool modminer_detect_one(const char *devpath)
  {
  	char buf[0x100];
  	char *devname;
  	ssize_t len;
  	int fd;
  
  #ifdef WIN32
  	fd = serial_open(devpath, 0, 10, true);
  	if (fd < 0) {
  		applog(LOG_ERR, "ModMiner detect: failed to open %s", devpath);
  		return false;
  	}
  
  	(void)(write(fd, NOOP, sizeof(NOOP)-1) ?:0);
  	while (serial_read(fd, buf, sizeof(buf)) > 0)
  		;
  
  	// Version
  	if (1 != write(fd, "\x01", 1)) {
  		applog(LOG_ERR, "ModMiner detect: version request failed on %s (%d)", devpath, errno);
  		goto shin;
  	}
  
  	len = serial_read(fd, buf, sizeof(buf)-1);
  	if (len < 1) {
  		applog(LOG_ERR, "ModMiner detect: no version reply on %s (%d)", devpath, errno);
  		goto shin;
  	}
  	buf[len] = '\0';
  	devname = strdup(buf);
  	applog(LOG_DEBUG, "ModMiner identified as: %s", devname);
  
  	// FPGA count
  	if (1 != write(fd, "\x02", 1)) {
  		applog(LOG_ERR, "ModMiner detect: FPGA count request failed on %s (%d)", devpath, errno);
  		goto shin;
  	}
  	len = read(fd, buf, 1);
  
  	if (len < 1) {
  		applog(LOG_ERR, "ModMiner detect: timeout waiting for FPGA count from %s (%d)", devpath, errno);
  		goto shin;
  	}
  
  	serial_close(fd);
  #else
  	fd = select_open(devpath);
  
  	if (fd < 0) {
  		applog(LOG_ERR, "ModMiner detect: failed to open %s", devpath);
  		return false;
  	}
  
  	// Don't care if they fail
  	select_write(fd, (char *)NOOP, sizeof(NOOP)-1);
  
  	// Will clear up to a max of sizeof(buf)-1 chars
  	select_read(fd, buf, sizeof(buf)-1);
  
  	// Version
  	if (select_write(fd, "\x01", 1) < 1) {
  		applog(LOG_ERR, "ModMiner detect: version request failed on %s (%d)", devpath, errno);
  		goto shin;
  	}
  
  	if ((len = select_read(fd, buf, sizeof(buf)-1)) < 1) {
  		applog(LOG_ERR, "ModMiner detect: no version reply on %s (%d)", devpath, errno);
  		goto shin;
  	}
  	buf[len] = '\0';
  	devname = strdup(buf);
  	applog(LOG_DEBUG, "ModMiner identified as: %s", devname);
  
  	// FPGA count
  	if (select_write(fd, "\x02", 1) < 1) {
  		applog(LOG_ERR, "ModMiner detect: FPGA count request failed on %s (%d)", devpath, errno);
  		goto shin;
  	}
  
  	if ((len = select_read(fd, buf, 1)) < 1) {
  		applog(LOG_ERR, "ModMiner detect: no FPGA count reply on %s (%d)", devpath, errno);
  		goto shin;
  	}
  
  	select_close(fd);
  #endif
  
  	// TODO: check if it supports 2 byte temperatures and if not
  	// add a flag and set it use 1 byte and code to use the flag
  
  	if (buf[0] == 0) {
  		applog(LOG_ERR, "ModMiner detect: zero FPGA count from %s", devpath);
  		goto shin;
  	}
  
  	if (buf[0] < 1 || buf[0] > 4) {
  		applog(LOG_ERR, "ModMiner detect: invalid FPGA count (%u) from %s", buf[0], devpath);
  		goto shin;
  	}
  
  	applog(LOG_DEBUG, "ModMiner %s has %u FPGAs", devname, buf[0]);
  
  	struct cgpu_info *modminer;
  	modminer = calloc(1, sizeof(*modminer));
  	modminer->api = &modminer_api;
  	mutex_init(&modminer->device_mutex);
  	modminer->device_path = strdup(devpath);
  	modminer->device_fd = -1;
  	modminer->deven = DEV_ENABLED;
  	modminer->threads = buf[0];
  	modminer->name = devname;
  
  	return add_cgpu(modminer);
  
  shin:
  
  #ifdef WIN32
  	serial_close(fd);
  #else
  	select_close(fd);
  #endif
  	return false;
  }
  
  static int modminer_detect_auto()
  {
  	return
  	serial_autodetect_udev     (modminer_detect_one, "*ModMiner*") ?:
  	serial_autodetect_devserial(modminer_detect_one, "BTCFPGA_ModMiner") ?:
  	0;
  }
  
  static void modminer_detect()
  {
  	serial_detect_auto(&modminer_api, modminer_detect_one, modminer_detect_auto);
  }
  
  #define bailout(...)  return _bailout(-1, modminer, __VA_ARGS__);
  #define bailout2(...)  return _bailout(fd, modminer, __VA_ARGS__);
  
  #define check_magic(L)  do {  \
  	if (1 != fread(buf, 1, 1, f))  \
  		bailout(LOG_ERR, "Error reading ModMiner firmware ('%c')", L);  \
  	if (buf[0] != L)  \
  		bailout(LOG_ERR, "ModMiner firmware has wrong magic ('%c')", L);  \
  } while(0)
  
  #define read_str(eng)  do {  \
  	if (1 != fread(buf, 2, 1, f))  \
  		bailout(LOG_ERR, "Error reading ModMiner firmware (" eng " len)");  \
  	len = (ubuf[0] << 8) | ubuf[1];  \
  	if (len >= sizeof(buf))  \
  		bailout(LOG_ERR, "ModMiner firmware " eng " too long");  \
  	if (1 != fread(buf, len, 1, f))  \
  		bailout(LOG_ERR, "Error reading ModMiner firmware (" eng ")");  \
  	buf[len] = '\0';  \
  } while(0)
  
  #define status_read(eng)  do {  \
  FD_ZERO(&fds); \
  FD_SET(fd, &fds);  \
  select(fd+1, &fds, NULL, NULL, NULL);  \
  	if (1 != read(fd, buf, 1))  \
  		bailout2(LOG_ERR, "%s %u: Error programming %s (" eng ")", modminer->api->name, modminer->device_id, modminer->device_path);  \
  	if (buf[0] != 1)  \
  		bailout2(LOG_ERR, "%s %u: Wrong " eng " programming %s", modminer->api->name, modminer->device_id, modminer->device_path);  \
  } while(0)
  
  static bool modminer_fpga_upload_bitstream(struct cgpu_info *modminer)
  {
  	fd_set fds;
  	char buf[0x100];
  	unsigned char *ubuf = (unsigned char *)buf;
  	unsigned long len;
  	char *p;
  	const char *fwfile = BITSTREAM_FILENAME;
  	char fpgaid = 4;  // "all FPGAs"
  
  	FILE *f = open_bitstream("modminer", fwfile);
  	if (!f)
  		bailout(LOG_ERR, "Error opening ModMiner firmware file %s", fwfile);
  	if (1 != fread(buf, 2, 1, f))
  		bailout(LOG_ERR, "Error reading ModMiner firmware (magic)");
  	if (buf[0] || buf[1] != 9)
  		bailout(LOG_ERR, "ModMiner firmware has wrong magic (9)");
  	if (-1 == fseek(f, 11, SEEK_CUR))
  		bailout(LOG_ERR, "ModMiner firmware seek failed");
  	check_magic('a');
  	read_str("design name");
  	applog(LOG_DEBUG, "ModMiner firmware file %s info:", fwfile);
  	applog(LOG_DEBUG, "  Design name: %s", buf);
  	p = strrchr(buf, ';') ?: buf;
  	p = strrchr(buf, '=') ?: p;
  	if (p[0] == '=')
  		++p;
  	unsigned long fwusercode = (unsigned long)strtoll(p, &p, 16);
  	if (p[0] != '\0')
  		bailout(LOG_ERR, "Bad usercode in ModMiner firmware file");
  	if (fwusercode == 0xffffffff)
  		bailout(LOG_ERR, "ModMiner firmware doesn't support user code");
  	applog(LOG_DEBUG, "  Version: %u, build %u", (fwusercode >> 8) & 0xff, fwusercode & 0xff);
  	check_magic('b');
  	read_str("part number");
  	applog(LOG_DEBUG, "  Part number: %s", buf);
  	check_magic('c');
  	read_str("build date");
  	applog(LOG_DEBUG, "  Build date: %s", buf);
  	check_magic('d');
  	read_str("build time");
  	applog(LOG_DEBUG, "  Build time: %s", buf);
  	check_magic('e');
  	if (1 != fread(buf, 4, 1, f))
  		bailout(LOG_ERR, "Error reading ModMiner firmware (data len)");
  	len = ((unsigned long)ubuf[0] << 24) | ((unsigned long)ubuf[1] << 16) | (ubuf[2] << 8) | ubuf[3];
  	applog(LOG_DEBUG, "  Bitstream size: %lu", len);
  
  	SOCKETTYPE fd = modminer->device_fd;
  
  	applog(LOG_WARNING, "%s %u: Programming %s... DO NOT EXIT CGMINER UNTIL COMPLETE", modminer->api->name, modminer->device_id, modminer->device_path);
  	buf[0] = '\x05';  // Program Bitstream
  	buf[1] = fpgaid;
  	buf[2] = (len >>  0) & 0xff;
  	buf[3] = (len >>  8) & 0xff;
  	buf[4] = (len >> 16) & 0xff;
  	buf[5] = (len >> 24) & 0xff;
  	if (6 != write(fd, buf, 6))
  		bailout2(LOG_ERR, "%s %u: Error programming %s (cmd)", modminer->api->name, modminer->device_id, modminer->device_path);
  	status_read("cmd reply");
  	ssize_t buflen;
  	while (len) {
  		buflen = len < 32 ? len : 32;
  		if (fread(buf, buflen, 1, f) != 1)
  			bailout2(LOG_ERR, "%s %u: File underrun programming %s (%d bytes left)", modminer->api->name, modminer->device_id, modminer->device_path, len);
  		if (write(fd, buf, buflen) != buflen)
  			bailout2(LOG_ERR, "%s %u: Error programming %s (data)", modminer->api->name, modminer->device_id,  modminer->device_path);
  		status_read("status");
  		len -= buflen;
  	}
  	status_read("final status");
  	applog(LOG_WARNING, "%s %u: Done programming %s", modminer->api->name, modminer->device_id, modminer->device_path);
  
  	return true;
  }
  
  static bool modminer_device_prepare(struct cgpu_info *modminer)
  {
  	int fd = serial_open(modminer->device_path, 0, 10, true);
  	if (unlikely(-1 == fd))
  		bailout(LOG_ERR, "%s %u: Failed to open %s", modminer->api->name, modminer->device_id, modminer->device_path);
  
  	modminer->device_fd = fd;
  	applog(LOG_INFO, "%s %u: Opened %s", modminer->api->name, modminer->device_id, modminer->device_path);
  
  	struct timeval now;
  	gettimeofday(&now, NULL);
  	get_datestamp(modminer->init, &now);
  
  	return true;
  }
  
  #undef bailout
  
  static bool modminer_fpga_prepare(struct thr_info *thr)
  {
  	struct cgpu_info *modminer = thr->cgpu;
  
  	// Don't need to lock the mutex here,
  	// since prepare runs from the main thread before the miner threads start
  	if (modminer->device_fd == -1 && !modminer_device_prepare(modminer))
  		return false;
  
  	struct modminer_fpga_state *state;
  	state = thr->cgpu_data = calloc(1, sizeof(struct modminer_fpga_state));
  	state->next_work_cmd[0] = '\x08';  // Send Job
  	state->next_work_cmd[1] = thr->device_thread;  // FPGA id
  	state->shares_to_good = MODMINER_EARLY_UP;
  
  	return true;
  }
  
  /*
   * Clocking rules:
   *	If device exceeds cutoff temp - shut down - and decrease the clock by
   *		MODMINER_OVERHEAT_CLOCK for when it restarts
   *
   * When to clock down:
   *	If device overheats
   *	 or
   *	If device gets MODMINER_HW_ERROR_PERCENT errors since last clock up or down
   *		if clock is <= default it requires 2 HW to do this test
   *		if clock is > default it only requires 1 HW to do this test
   *
   * When to clock up:
   *	If device gets shares_to_good good shares in a row
   *
   * N.B. clock must always be a multiple of 2
   */
  static bool modminer_delta_clock(struct thr_info *thr, bool needlock, int delta, bool temp)
  {
  	struct cgpu_info *modminer = thr->cgpu;
  	struct modminer_fpga_state *state = thr->cgpu_data;
  	char fpgaid = thr->device_thread;
  	int fd = modminer->device_fd;
  	unsigned char cmd[6], buf[1];
  	struct timeval now;
  
  	gettimeofday(&now, NULL);
  
  	// Only do once if multiple shares per work or multiple reasons
  	// Since the temperature down clock test is first in the code this is OK
  	if (tdiff(&now, &(state->last_changed)) < 0.5)
  		return false;
  
  	// Update before possibly aborting to avoid repeating unnecessarily
  	memcpy(&(state->last_changed), &now, sizeof(struct timeval));
  	state->shares = 0;
  	state->shares_last_hw = 0;
  	state->hw_errors = 0;
  
  	// If drop requested due to temperature, clock drop is always allowed
  	if (!temp && delta < 0 && state->clock <= MODMINER_MIN_CLOCK)
  		return false;
  
  	if (delta > 0 && state->clock >= MODMINER_MAX_CLOCK)
  		return false;
  
  	if (delta < 0) {
  		if ((state->shares_to_good * 2) < MODMINER_TRY_UP)
  			state->shares_to_good *= 2;
  		else
  			state->shares_to_good = MODMINER_TRY_UP;
  	}
  
  	state->clock += delta;
  
  	cmd[0] = '\x06';  // set clock speed
  	cmd[1] = fpgaid;
  	cmd[2] = state->clock;
  	cmd[3] = cmd[4] = cmd[5] = '\0';
  
  	if (needlock)
  		mutex_lock(&modminer->device_mutex);
  	if (6 != write(fd, cmd, 6))
  		bailout2(LOG_ERR, "%s%u.%u: Error writing (set clock speed)", modminer->api->name, modminer->device_id, fpgaid);
  	if (serial_read(fd, &buf, 1) != 1)
  		bailout2(LOG_ERR, "%s%u.%u: Error reading (set clock speed)", modminer->api->name, modminer->device_id, fpgaid);
  	if (needlock)
  		mutex_unlock(&modminer->device_mutex);
  
  	applog(LOG_WARNING, "%s%u.%u: Set clock speed %sto %u", modminer->api->name, modminer->device_id, fpgaid, (delta < 0) ? "down " : (delta > 0 ? "up " : ""), state->clock);
  
  	return true;
  }
  
  static bool modminer_fpga_init(struct thr_info *thr)
  {
  	struct cgpu_info *modminer = thr->cgpu;
  	struct modminer_fpga_state *state = thr->cgpu_data;
  	int fd;
  	char fpgaid = thr->device_thread;
  
  	unsigned char cmd[2], buf[4];
  
  	mutex_lock(&modminer->device_mutex);
  	fd = modminer->device_fd;
  	if (fd == -1) {
  		// Died in another thread...
  		mutex_unlock(&modminer->device_mutex);
  		return false;
  	}
  
  	cmd[0] = '\x04';  // Read USER code (bitstream id)
  	cmd[1] = fpgaid;
  	if (write(fd, cmd, 2) != 2)
  		bailout2(LOG_ERR, "%s%u.%u: Error writing (read USER code)", modminer->api->name, modminer->device_id, fpgaid);
  	if (serial_read(fd, buf, 4) != 4)
  		bailout2(LOG_ERR, "%s%u.%u: Error reading (read USER code)", modminer->api->name, modminer->device_id, fpgaid);
  
  	if (memcmp(buf, BISTREAM_USER_ID, 4)) {
  		applog(LOG_ERR, "%s%u.%u: FPGA not programmed", modminer->api->name, modminer->device_id, fpgaid);
  		if (!modminer_fpga_upload_bitstream(modminer))
  			return false;
  	}
  	else
  		applog(LOG_DEBUG, "%s%u.%u: FPGA is already programmed :)", modminer->api->name, modminer->device_id, fpgaid);
  
  	state->clock = MODMINER_DEF_CLOCK;
  	modminer_delta_clock(thr, false, MODMINER_CLOCK_SET, false);
  
  	mutex_unlock(&modminer->device_mutex);
  
  	thr->primary_thread = true;
  
  	return true;
  }
  
  static void get_modminer_statline_before(char *buf, struct cgpu_info *modminer)
  {
  	char info[18] = "               | ";
  	int tc = modminer->threads;
  	bool havetemp = false;
  	int i;
  
  	if (tc > 4)
  		tc = 4;
  
  	for (i = tc - 1; i >= 0; --i) {
  		struct thr_info *thr = modminer->thr[i];
  		struct modminer_fpga_state *state = thr->cgpu_data;
  		float temp = state->temp;
  
  		info[i*3+2] = '/';
  		if (temp) {
  			havetemp = true;
  			if (temp > 9)
  				info[i*3+0] = 0x30 + (temp / 10);
  			info[i*3+1] = 0x30 + ((int)temp % 10);
  		}
  	}
  	if (havetemp) {
  		info[tc*3-1] = ' ';
  		info[tc*3] = 'C';
  		strcat(buf, info);
  	}
  	else
  		strcat(buf, "               | ");
  }
  
  static bool modminer_prepare_next_work(struct modminer_fpga_state *state, struct work *work)
  {
  	char *midstate = state->next_work_cmd + 2;
  	char *taildata = midstate + 32;
  	if (!(memcmp(midstate, work->midstate, 32) || memcmp(taildata, work->data + 64, 12)))
  		return false;
  	memcpy(midstate, work->midstate, 32);
  	memcpy(taildata, work->data + 64, 12);
  	return true;
  }
  
  static bool modminer_start_work(struct thr_info *thr)
  {
  fd_set fds;
  	struct cgpu_info *modminer = thr->cgpu;
  	struct modminer_fpga_state *state = thr->cgpu_data;
  	char fpgaid = thr->device_thread;
  	SOCKETTYPE fd = modminer->device_fd;
  
  	char buf[1];
  
  	mutex_lock(&modminer->device_mutex);
  	if (46 != write(fd, state->next_work_cmd, 46))
  		bailout2(LOG_ERR, "%s%u.%u: Error writing (start work)", modminer->api->name, modminer->device_id, fpgaid);
  	gettimeofday(&state->tv_workstart, NULL);
  	state->hashes = 0;
  	status_read("start work");
  	mutex_unlock(&modminer->device_mutex);
  
  	return true;
  }
  
  #define work_restart(thr)  thr->work_restart
  
  static uint64_t modminer_process_results(struct thr_info *thr)
  {
  	struct cgpu_info *modminer = thr->cgpu;
  	struct modminer_fpga_state *state = thr->cgpu_data;
  	char fpgaid = thr->device_thread;
  	int fd = modminer->device_fd;
  	struct work *work = &state->running_work;
  
  	char cmd[2], temperature[2];
  	uint32_t nonce;
  	long iter;
  	uint32_t curr_hw_errors;
  
  	// \x0a is 1 byte temperature
  	// \x0d is 2 byte temperature
  	cmd[0] = '\x0d';
  	cmd[1] = fpgaid;
  
  	mutex_lock(&modminer->device_mutex);
  	if (2 == write(fd, cmd, 2) && read(fd, &temperature, 2) == 2)
  	{
  		// Only accurate to 2 and a bit places
  		state->temp = roundf((temperature[1] * 256.0 + temperature[0]) / 0.128) / 1000.0;
  		if (!fpgaid)
  			modminer->temp = state->temp;
  
  		if (state->temp >= MODMINER_OVERHEAT_TEMP) {
  			if (state->temp >= MODMINER_CUTOFF_TEMP) {
  				applog(LOG_WARNING, "%s%u.%u: Hit thermal cutoff limit (%f) at %f, disabling device!", modminer->api->name, modminer->device_id, fpgaid, MODMINER_CUTOFF_TEMP, state->temp);
  				modminer_delta_clock(thr, true, MODMINER_OVERHEAT_CLOCK, true);
  
  				modminer->deven = DEV_RECOVER;
  				modminer->device_last_not_well = time(NULL);
  				modminer->device_not_well_reason = REASON_DEV_THERMAL_CUTOFF;
  				modminer->dev_thermal_cutoff_count++;
  			} else {
  				 applog(LOG_WARNING, "%s%u.%u Overheat limit (%f) reached %f", modminer->api->name, modminer->device_id, fpgaid, MODMINER_OVERHEAT_TEMP, state->temp);
  				modminer_delta_clock(thr, true, MODMINER_CLOCK_DOWN, true);
  
  				modminer->device_last_not_well = time(NULL);
  				modminer->device_not_well_reason = REASON_DEV_OVER_HEAT;
  				modminer->dev_over_heat_count++;
  			}
  		}
  	}
  
  	cmd[0] = '\x09';
  	iter = 200;
  	while (1) {
  		if (write(fd, cmd, 2) != 2)
  			bailout2(LOG_ERR, "%s%u.%u: Error reading (get nonce)", modminer->api->name, modminer->device_id, fpgaid);
  		serial_read(fd, &nonce, 4);
  		mutex_unlock(&modminer->device_mutex);
  		if (memcmp(&nonce, "\xff\xff\xff\xff", 4)) {
  			state->shares++;
  			state->no_nonce_counter = 0;
  			curr_hw_errors = state->hw_errors;
  			submit_nonce(thr, work, nonce);
  			if (state->hw_errors > curr_hw_errors) {
  				state->shares_last_hw = state->shares;
  				if (state->clock > MODMINER_DEF_CLOCK || state->hw_errors > 1) {
  					float pct = (state->hw_errors * 100.0 / (state->shares ? : 1.0));
  					if (pct >= MODMINER_HW_ERROR_PERCENT)
  						modminer_delta_clock(thr, true, MODMINER_CLOCK_DOWN, false);
  				}
  			} else {
  				// If we've reached the required good shares in a row then clock up
  				if ((state->shares - state->shares_last_hw) >= state->shares_to_good)
  					modminer_delta_clock(thr, true, MODMINER_CLOCK_UP, false);
  			}
  		} else if (++state->no_nonce_counter > 18000) {
  			// TODO: NFI what this is - but will be gone
  			// when the threading rewrite is done
  			state->no_nonce_counter = 0;
  			modminer_delta_clock(thr, true, MODMINER_CLOCK_DOWN, false);
  		}
  
  		if (work_restart(thr))
  			break;
  		usleep(10000);
  		if (work_restart(thr) || !--iter)
  			break;
  		mutex_lock(&modminer->device_mutex);
  	}
  
  	struct timeval tv_workend, elapsed;
  	gettimeofday(&tv_workend, NULL);
  	timersub(&tv_workend, &state->tv_workstart, &elapsed);
  
  	uint64_t hashes = (uint64_t)state->clock * (((uint64_t)elapsed.tv_sec * 1000000) + elapsed.tv_usec);
  	if (hashes > 0xffffffff)
  		hashes = 0xffffffff;
  	else
  	if (hashes <= state->hashes)
  		hashes = 1;
  	else
  		hashes -= state->hashes;
  	state->hashes += hashes;
  	return hashes;
  }
  
  static int64_t modminer_scanhash(struct thr_info *thr, struct work *work, int64_t __maybe_unused max_nonce)
  {
  	struct modminer_fpga_state *state = thr->cgpu_data;
  	int64_t hashes = 0;
  	bool startwork;
  
  	startwork = modminer_prepare_next_work(state, work);
  	if (state->work_running) {
  		hashes = modminer_process_results(thr);
  		if (work_restart(thr)) {
  			state->work_running = false;
  			return 0;
  		}
  	} else
  		state->work_running = true;
  
  	if (startwork) {
  		if (!modminer_start_work(thr))
  			return -1;
  		memcpy(&state->running_work, work, sizeof(state->running_work));
  	}
  
  	// This is intentionally early
  	work->blk.nonce += hashes;
  	return hashes;
  }
  
  static void modminer_hw_error(struct thr_info *thr)
  {
  	struct modminer_fpga_state *state = thr->cgpu_data;
  
  	state->hw_errors++;
  }
  
  static void modminer_fpga_shutdown(struct thr_info *thr)
  {
  	free(thr->cgpu_data);
  }
  
  struct device_api modminer_api = {
  	.dname = "modminer",
  	.name = "MMQ",
  	.api_detect = modminer_detect,
  	.get_statline_before = get_modminer_statline_before,
  	.thread_prepare = modminer_fpga_prepare,
  	.thread_init = modminer_fpga_init,
  	.scanhash = modminer_scanhash,
  	.hw_error = modminer_hw_error,
  	.thread_shutdown = modminer_fpga_shutdown,
  };
  

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