thodg/cgminer

diff --git a/FPGA-README b/FPGA-README
index 7b9f004..0c4da8a 100644
--- a/FPGA-README
+++ b/FPGA-README
@@ -16,7 +16,25 @@ p2pool.
 
 Icarus
 
-There is a hidden option in cgminer when Icarus support is compiled in:
+There are two hidden options in cgminer when Icarus support is compiled in:
+
+--icarus-options <arg> Set specific FPGA board configurations - one set of values for all or comma separated
+           baud:work_division:fpga_count
+
+           baud           The Serial/USB baud rate - 115200 or 57600 only - default 115200
+           work_division  The fraction of work divided up for each FPGA chip - 1, 2, 4 or 8
+                          e.g. 2 means each FPGA does half the nonce range - default 2
+           fpga_count     The actual number of FPGA working - this would normally be the same
+                          as work_division - range is from 1 up to 'work_division'
+                          It defaults to the value of work_division - or 2 if you don't specify
+                          work_division
+
+If you define fewer comma seperated values than Icarus devices, the last values will be used
+for all extra devices
+
+An example would be: --icarus-options 57600:2:1
+This would mean: use 57600 baud, the FPGA board divides the work in half however
+only 1 FPGA actually runs on the board (e.g. like an early CM1 Icarus copy bitstream)
 
 --icarus-timing <arg> Set how the Icarus timing is calculated - one setting/value for all or comma separated
            default[=N]   Use the default Icarus hash time (2.6316ns)
@@ -24,6 +42,9 @@ There is a hidden option in cgminer when Icarus support is compiled in:
            long          Re-calculate the hash time continuously
            value[=N]     Specify the hash time in nanoseconds (e.g. 2.6316) and abort time (e.g. 2.6316=80)
 
+If you define fewer comma seperated values than Icarus devices, the last values will be used
+for all extra devices
+
 Icarus timing is required for devices that do not exactly match a default Icarus Rev3 in
 processing speed
 If you have an Icarus Rev3 you should not normally need to use --icarus-timing since the
@@ -55,9 +76,9 @@ bitstream to the default one, use 'long' mode and give it at least a few hundred
 'short' mode and take note of the final hash time value (Hs) calculated
 You can also use the RPC API 'stats' command to see the current hash time (Hs) at any time
 
-The Icarus code currently only works with a dual FPGA device that supports the same commands as
+The Icarus code currently only works with an FPGA device that supports the same commands as
 Icarus Rev3 requires and also is less than ~840MH/s and greater than 2MH/s
-If a dual FPGA device does hash faster than ~840MH/s it should work correctly if you supply the
+If an FPGA device does hash faster than ~840MH/s it should work correctly if you supply the
 correct hash time nanoseconds value
 
 The timing code itself will affect the Icarus performance since it increases the delay after
diff --git a/cgminer.c b/cgminer.c
index 67aacb2..557461d 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -142,6 +142,7 @@ bool opt_api_listen;
 bool opt_api_network;
 bool opt_delaynet;
 bool opt_disable_pool = true;
+char *opt_icarus_options = NULL;
 char *opt_icarus_timing = NULL;
 
 char *opt_kernel_path;
@@ -710,6 +711,13 @@ static char *set_api_description(const char *arg)
 }
 
 #ifdef USE_ICARUS
+static char *set_icarus_options(const char *arg)
+{
+	opt_set_charp(arg, &opt_icarus_options);
+
+	return NULL;
+}
+
 static char *set_icarus_timing(const char *arg)
 {
 	opt_set_charp(arg, &opt_icarus_timing);
@@ -873,6 +881,9 @@ static struct opt_table opt_config_table[] = {
 		     "Override sha256 kernel to use (diablo, poclbm, phatk or diakgcn) - one value or comma separated"),
 #endif
 #ifdef USE_ICARUS
+	OPT_WITH_ARG("--icarus-options",
+		     set_icarus_options, NULL, NULL,
+		     opt_hidden),
 	OPT_WITH_ARG("--icarus-timing",
 		     set_icarus_timing, NULL, NULL,
 		     opt_hidden),
@@ -3013,6 +3024,8 @@ void write_config(FILE *fcfg)
 		fprintf(fcfg, ",\n\"api-description\" : \"%s\"", opt_api_description);
 	if (opt_api_groups)
 		fprintf(fcfg, ",\n\"api-groups\" : \"%s\"", opt_api_groups);
+	if (opt_icarus_options)
+		fprintf(fcfg, ",\n\"icarus-options\" : \"%s\"", opt_icarus_options);
 	if (opt_icarus_timing)
 		fprintf(fcfg, ",\n\"icarus-timing\" : \"%s\"", opt_icarus_timing);
 	fputs("\n}", fcfg);
diff --git a/driver-icarus.c b/driver-icarus.c
index 5f2c78a..f1cf9d1 100644
--- a/driver-icarus.c
+++ b/driver-icarus.c
@@ -65,7 +65,7 @@
 #define ASSERT1(condition) __maybe_unused static char sizeof_uint32_t_must_be_4[(condition)?1:-1]
 ASSERT1(sizeof(uint32_t) == 4);
 
-#define ICARUS_READ_TIME ((double)ICARUS_READ_SIZE * (double)8.0 / (double)ICARUS_IO_SPEED)
+#define ICARUS_READ_TIME(baud) ((double)ICARUS_READ_SIZE * (double)8.0 / (double)(baud))
 
 // Fraction of a second, USB timeout is measured in
 // i.e. 10 means 1/10 of a second
@@ -176,11 +176,36 @@ struct ICARUS_INFO {
 	// (which will only affect W)
 	uint64_t history_count;
 	struct timeval history_time;
+
+	// icarus-options
+	int baud;
+	int work_division;
+	int fpga_count;
+	uint32_t nonce_mask;
 };
 
+#define END_CONDITION 0x0000ffff
+
 // One for each possible device
 static struct ICARUS_INFO **icarus_info;
 
+// Looking for options in --icarus-timing and --icarus-options:
+//
+// Code increments this each time we start to look at a device
+// However, this means that if other devices are checked by
+// the Icarus code (e.g. BFL) they will count in the option offset
+//
+// This, however, is deterministic so that's OK
+//
+// If we were to increment after successfully finding an Icarus
+// that would be random since an Icarus may fail and thus we'd
+// not be able to predict the option order
+//
+// This also assumes that serial_detect() checks them sequentially
+// and in the order specified on the command line
+//
+static int option_offset = -1;
+
 struct device_api icarus_api;
 
 static void rev(unsigned char *s, size_t l)
@@ -195,8 +220,8 @@ static void rev(unsigned char *s, size_t l)
 	}
 }
 
-#define icarus_open2(devpath, purge)  serial_open(devpath, 115200, ICARUS_READ_FAULT_DECISECONDS, purge)
-#define icarus_open(devpath)  icarus_open2(devpath, false)
+#define icarus_open2(devpath, baud, purge)  serial_open(devpath, baud, ICARUS_READ_FAULT_DECISECONDS, purge)
+#define icarus_open(devpath, baud)  icarus_open2(devpath, baud, false)
 
 static int icarus_gets(unsigned char *buf, int fd, struct timeval *tv_finish, struct thr_info *thr, int read_count)
 {
@@ -272,7 +297,7 @@ static const char *timing_mode_str(enum timing_mode timing_mode)
 	}
 }
 
-static void set_timing_mode(struct cgpu_info *icarus)
+static void set_timing_mode(int this_option_offset, struct cgpu_info *icarus)
 {
 	struct ICARUS_INFO *info = icarus_info[icarus->device_id];
 	double Hs;
@@ -285,7 +310,7 @@ static void set_timing_mode(struct cgpu_info *icarus)
 		buf[0] = '\0';
 	else {
 		ptr = opt_icarus_timing;
-		for (i = 0; i < icarus->device_id; i++) {
+		for (i = 0; i < this_option_offset; i++) {
 			comma = strchr(ptr, ',');
 			if (comma == NULL)
 				break;
@@ -354,11 +379,123 @@ static void set_timing_mode(struct cgpu_info *icarus)
 
 	applog(LOG_DEBUG, "Icarus: Init: %d mode=%s read_count=%d Hs=%e",
 		icarus->device_id, timing_mode_str(info->timing_mode), info->read_count, info->Hs);
+}
+
+static uint32_t mask(int work_division)
+{
+	char err_buf[BUFSIZ+1];
+	uint32_t nonce_mask = 0x7fffffff;
+
+	// yes we can calculate these, but this way it's easy to see what they are
+	switch (work_division) {
+	case 1:
+		nonce_mask = 0xffffffff;
+		break;
+	case 2:
+		nonce_mask = 0x7fffffff;
+		break;
+	case 4:
+		nonce_mask = 0x3fffffff;
+		break;
+	case 8:
+		nonce_mask = 0x1fffffff;
+		break;
+	default:
+		sprintf(err_buf, "Invalid2 icarus-options for work_division (%d) must be 1, 2, 4 or 8", work_division);
+		quit(1, err_buf);
+	}
+
+	return nonce_mask;
+}
+
+static void get_options(int this_option_offset, int *baud, int *work_division, int *fpga_count)
+{
+	char err_buf[BUFSIZ+1];
+	char buf[BUFSIZ+1];
+	char *ptr, *comma, *colon, *colon2;
+	size_t max;
+	int i, tmp;
+
+	if (opt_icarus_options == NULL)
+		buf[0] = '\0';
+	else {
+		ptr = opt_icarus_options;
+		for (i = 0; i < this_option_offset; i++) {
+			comma = strchr(ptr, ',');
+			if (comma == NULL)
+				break;
+			ptr = comma + 1;
+		}
+
+		comma = strchr(ptr, ',');
+		if (comma == NULL)
+			max = strlen(ptr);
+		else
+			max = comma - ptr;
 
+		if (max > BUFSIZ)
+			max = BUFSIZ;
+		strncpy(buf, ptr, max);
+		buf[max] = '\0';
+	}
+
+	*baud = ICARUS_IO_SPEED;
+	*work_division = 2;
+	*fpga_count = 2;
+
+	if (*buf) {
+		colon = strchr(buf, ':');
+		if (colon)
+			*(colon++) = '\0';
+
+		if (*buf) {
+			tmp = atoi(buf);
+			switch (tmp) {
+			case 115200:
+				*baud = 115200;
+				break;
+			case 57600:
+				*baud = 57600;
+				break;
+			default:
+				sprintf(err_buf, "Invalid icarus-options for baud (%s) must be 115200 or 57600", buf);
+				quit(1, err_buf);
+			}
+		}
+
+		if (colon && *colon) {
+			colon2 = strchr(colon, ':');
+			if (colon2)
+				*(colon2++) = '\0';
+
+			if (*colon) {
+				tmp = atoi(colon);
+				if (tmp == 1 || tmp == 2 || tmp == 4 || tmp == 8) {
+					*work_division = tmp;
+					*fpga_count = tmp;	// default to the same
+				} else {
+					sprintf(err_buf, "Invalid icarus-options for work_division (%s) must be 1, 2, 4 or 8", colon);
+					quit(1, err_buf);
+				}
+			}
+
+			if (colon2 && *colon2) {
+				tmp = atoi(colon2);
+				if (tmp > 0 && tmp <= *work_division)
+					*fpga_count = tmp;
+				else {
+					sprintf(err_buf, "Invalid icarus-options for fpga_count (%s) must be >0 and <=work_division (%d)", colon2, *work_division);
+					quit(1, err_buf);
+				}
+			}
+		}
+	}
 }
 
 static bool icarus_detect_one(const char *devpath)
 {
+	int this_option_offset = ++option_offset;
+
 	struct ICARUS_INFO *info;
 	struct timeval tv_start, tv_finish;
 	int fd;
@@ -379,9 +516,13 @@ static bool icarus_detect_one(const char *devpath)
 	unsigned char ob_bin[64], nonce_bin[ICARUS_READ_SIZE];
 	char *nonce_hex;
 
+	int baud, work_division, fpga_count;
+
+	get_options(this_option_offset, &baud, &work_division, &fpga_count);
+
 	applog(LOG_DEBUG, "Icarus Detect: Attempting to open %s", devpath);
 
-	fd = icarus_open2(devpath, true);
+	fd = icarus_open2(devpath, baud, true);
 	if (unlikely(fd == -1)) {
 		applog(LOG_ERR, "Icarus Detect: Failed to open %s", devpath);
 		return false;
@@ -429,6 +570,9 @@ static bool icarus_detect_one(const char *devpath)
 	applog(LOG_INFO, "Found Icarus at %s, mark as %d",
 		devpath, icarus->device_id);
 
+	applog(LOG_DEBUG, "Icarus: Init: %d baud=%d work_division=%d fpga_count=%d",
+		icarus->device_id, baud, work_division, fpga_count);
+
 	// Since we are adding a new device on the end it needs to always be allocated
 	icarus_info[icarus->device_id] = (struct ICARUS_INFO *)malloc(sizeof(struct ICARUS_INFO));
 	if (unlikely(!(icarus_info[icarus->device_id])))
@@ -439,10 +583,15 @@ static bool icarus_detect_one(const char *devpath)
 	// Initialise everything to zero for a new device
 	memset(info, 0, sizeof(struct ICARUS_INFO));
 
-	info->golden_hashes = (golden_nonce_val & 0x7fffffff) << 1;
+	info->baud = baud;
+	info->work_division = work_division;
+	info->fpga_count = fpga_count;
+	info->nonce_mask = mask(work_division);
+
+	info->golden_hashes = (golden_nonce_val & info->nonce_mask) * fpga_count;
 	timersub(&tv_finish, &tv_start, &(info->golden_tv));
 
-	set_timing_mode(icarus);
+	set_timing_mode(this_option_offset, icarus);
 
 	return true;
 }
@@ -458,7 +607,7 @@ static bool icarus_prepare(struct thr_info *thr)
 
 	struct timeval now;
 
-	int fd = icarus_open(icarus->device_path);
+	int fd = icarus_open(icarus->device_path, icarus_info[icarus->device_id]->baud);
 	if (unlikely(-1 == fd)) {
 		applog(LOG_ERR, "Failed to open Icarus on %s",
 		       icarus->device_path);
@@ -565,11 +714,9 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 
 	submit_nonce(thr, work, nonce);
 
-	hash_count = (nonce & 0x7fffffff);
-	if (hash_count++ == 0x7fffffff)
-		hash_count = 0xffffffff;
-	else
-		hash_count <<= 1;
+	hash_count = (nonce & info->nonce_mask);
+	hash_count++;
+	hash_count *= info->fpga_count;
 
 	if (opt_debug || info->do_icarus_timing)
 		timersub(&tv_finish, &tv_start, &elapsed);
@@ -580,7 +727,9 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 	}
 
 	// ignore possible end condition values
-	if (info->do_icarus_timing && (nonce & 0x7fffffff) > 0x000fffff && (nonce & 0x7fffffff) < 0x7ff00000) {
+	if (info->do_icarus_timing
+	&&  ((nonce & info->nonce_mask) > END_CONDITION)
+	&&  ((nonce & info->nonce_mask) < (info->nonce_mask & ~END_CONDITION))) {
 		gettimeofday(&tv_history_start, NULL);
 
 		history0 = &(info->history[0]);
@@ -590,7 +739,7 @@ static int64_t icarus_scanhash(struct thr_info *thr, struct work *work,
 
 		Ti = (double)(elapsed.tv_sec)
 			+ ((double)(elapsed.tv_usec))/((double)1000000)
-			- ICARUS_READ_TIME;
+			- ((double)ICARUS_READ_TIME(info->baud));
 		Xi = (double)hash_count;
 		history0->sumXiTi += Xi * Ti;
 		history0->sumXi += Xi;
@@ -700,6 +849,9 @@ static struct api_data *icarus_api_stats(struct cgpu_info *cgpu)
 	root = api_add_uint(root, "timing_values", &(info->history[0].values), false);
 	root = api_add_const(root, "timing_mode", timing_mode_str(info->timing_mode), false);
 	root = api_add_bool(root, "is_timing", &(info->do_icarus_timing), false);
+	root = api_add_int(root, "baud", &(info->baud), false);
+	root = api_add_int(root, "work_division", &(info->work_division), false);
+	root = api_add_int(root, "fpga_count", &(info->fpga_count), false);
 
 	return root;
 }
diff --git a/miner.h b/miner.h
index 02c488d..db272da 100644
--- a/miner.h
+++ b/miner.h
@@ -562,6 +562,7 @@ extern bool opt_api_listen;
 extern bool opt_api_network;
 extern bool opt_delaynet;
 extern bool opt_restart;
+extern char *opt_icarus_options;
 extern char *opt_icarus_timing;
 #ifdef USE_BITFORCE
 extern bool opt_bfl_noncerange;