[usb-driver] / jtagkey.c

#include <stdio.h>
#include <ftdi.h>
#include <unistd.h>
#include <pthread.h>
#include "usb-driver.h"
#include "config.h"
#include "jtagkey.h"
#include "jtagmon.h"

#define USBBUFSIZE 1048576
#define JTAG_SPEED 100000
#define BULK_LATENCY 2
#define OTHER_LATENCY 1

static struct ftdi_context ftdic;

static int jtagkey_latency(int latency) {
	static int current = 0;
	int ret;

	if (current != latency) {
		DPRINTF("switching latency\n");
		if ((ret = ftdi_set_latency_timer(&ftdic, latency))  != 0) {
			fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
			return ret;
		}
		
		current = latency;
	}

	return ret;
}

static int jtagkey_init(unsigned short vid, unsigned short pid) {
	int ret = 0;
	unsigned char c;

	if ((ret = ftdi_init(&ftdic)) != 0) {
		fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}
	
	if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
		fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
		fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_set_interface(&ftdic, INTERFACE_A)) != 0) {
		fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_write_data_set_chunksize(&ftdic, USBBUFSIZE))  != 0) {
		fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_read_data_set_chunksize(&ftdic, USBBUFSIZE))  != 0) {
		fprintf(stderr, "unable to set read chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = jtagkey_latency(OTHER_LATENCY)) != 0)
		return ret;

	c = 0x00;
	ftdi_write_data(&ftdic, &c, 1);

	if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK|JTAGKEY_TDI|JTAGKEY_TMS|JTAGKEY_OEn, BITMODE_SYNCBB))  != 0) {
		fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_set_baudrate(&ftdic, JTAG_SPEED))  != 0) {
		fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	if ((ret = ftdi_usb_purge_buffers(&ftdic))  != 0) {
		fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
		return ret;
	}

	return ret;
}

int jtagkey_open(int num) {
	int ret;

	ret = jtagkey_init(config_usb_vid(num), config_usb_pid(num));

	if (ret >= 0)
		ret = 0xff;

	return ret;
}

void jtagkey_close(int handle) {
	if (handle == 0xff) {
		ftdi_disable_bitbang(&ftdic);
		ftdi_usb_close(&ftdic);
		ftdi_deinit(&ftdic);
	}
}

void jtagkey_state(unsigned char data) {
	fprintf(stderr,"Pins high: ");

	if (data & JTAGKEY_TCK)
		fprintf(stderr,"TCK ");

	if (data & JTAGKEY_TDI)
		fprintf(stderr,"TDI ");

	if (data & JTAGKEY_TDO)
		fprintf(stderr,"TDO ");

	if (data & JTAGKEY_TMS)
		fprintf(stderr,"TMS ");

	if (data & JTAGKEY_VREF)
		fprintf(stderr,"VREF ");
	
	fprintf(stderr,"\n");
}

struct jtagkey_reader_arg {
	int		num;
	unsigned char	*buf;
};

static void *jtagkey_reader(void *thread_arg) {
	struct jtagkey_reader_arg *arg = (struct jtagkey_reader_arg*)thread_arg;
	int i;

	i = 0;
	DPRINTF("reader for %d bytes\n", arg->num);
	while (i < arg->num) {
		i += ftdi_read_data(&ftdic, arg->buf + i, arg->num - i);
	}
	
	pthread_exit(NULL);
}

/* TODO: Interpret JTAG commands and transfer in MPSSE mode */
int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
	int ret = 0;
	int i;
	int nread = 0;
	unsigned long port;
	unsigned char val;
	static unsigned char last_data = 0;
	static unsigned char last_write = 0x00;
	static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
	static unsigned char readbuf[USBBUFSIZE], *readpos;
	unsigned char data, prev_data, last_cyc_write;
	struct jtagkey_reader_arg targ;
	pthread_t reader_thread;

	/* Count reads */
	for (i = 0; i < num; i++)
		if (tr[i].cmdTrans == PP_READ)
			nread++;

	/* Write combining */
	if ((writepos-writebuf > sizeof(writebuf)-num) || (nread && writepos-writebuf)) {
		unsigned char *pos = writebuf;
		int len;

		DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
		jtagkey_latency(BULK_LATENCY);

		targ.num = writepos-pos;
		targ.buf = readbuf;
		pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);

		while (pos < writepos) {
			len = writepos-pos;

			if (len > USBBUFSIZE)
				len = USBBUFSIZE;

			DPRINTF("combined write of %d/%d\n",len,writepos-pos);
			ftdi_write_data(&ftdic, pos, len);
			pos += len;
		}
		pthread_join(reader_thread, NULL);

		writepos = writebuf;
	}

	last_cyc_write = last_write;

	for (i = 0; i < num; i++) {
		DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
				(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
				tr[i].fAutoinc, tr[i].dwOptions);

		port = (unsigned long)tr[i].dwPort;
		val = tr[i].Data.Byte;

#ifdef DEBUG
		if (tr[i].cmdTrans == 13)
			DPRINTF("write byte: %d\n", val);

		if (tr[i].cmdTrans == 13)
			jtagmon(val & PP_TCK, val & PP_TMS, val & PP_TDI);
#endif

		/* Pad writebuf for read-commands in stream */
		*writepos = last_data;
		prev_data = last_data;

		if (port == ppbase + PP_DATA) {
			DPRINTF("data port\n");

			data = 0x00;
			switch(tr[i].cmdTrans) {
				case PP_READ:
					ret = 0; /* We don't support reading of the data port */
					break;

				case PP_WRITE:
					if (val & PP_TDI) {
						data |= JTAGKEY_TDI;
						DPRINTF("TDI\n");
					} else {
						DPRINTF("!TDI\n");
					}
					if (val & PP_TCK) {
						data |= JTAGKEY_TCK;
						DPRINTF("TCK\n");
					} else {
						DPRINTF("!TCK\n");
					}
					if (val & PP_TMS) {
						data |= JTAGKEY_TMS;
						DPRINTF("TMS\n");
					} else {
						DPRINTF("!TMS\n");
					}
					if (val & PP_CTRL) {
						data = JTAGKEY_OEn;
						DPRINTF("CTRL\n");
					} else {
						DPRINTF("!CTRL\n");
					}

					if (val & PP_PROG) {
						DPRINTF("PROG\n");
					} else {
						DPRINTF("!PROG\n");
					}

					*writepos = data;

					last_data = data;
					last_write = val;
					break;

				default:
					fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
					ret = -1;
					break;
			}
		}

		if ((tr[i].cmdTrans == PP_READ) || (*writepos != prev_data) || (i == num-1))
			writepos++;
	}

	if (nread)
	{
		DPRINTF("writing %d bytes\n", writepos-writebuf);

		*writepos = last_data;
		writepos++;

		jtagkey_latency(OTHER_LATENCY);

		targ.num = writepos-writebuf;
		targ.buf = readbuf;
		pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
		ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
		pthread_join(reader_thread, NULL);

#ifdef DEBUG
		DPRINTF("write: ");
		hexdump(writebuf, writepos-writebuf);
		DPRINTF("read: ");
		hexdump(readbuf, i);
#endif

		writepos = writebuf;
	} else {
		return ret;
	}

	readpos = readbuf;
	last_write = last_cyc_write;

	for (i = 0; i < num; i++) {
		DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
				(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
				tr[i].fAutoinc, tr[i].dwOptions);

		port = (unsigned long)tr[i].dwPort;
		val = tr[i].Data.Byte;

		if ((tr[i].cmdTrans != PP_READ) && (val == last_write) && (i != num-1))
			continue;

		readpos++;

		if (port == ppbase + PP_DATA) {
			if (tr[i].cmdTrans == PP_WRITE) {
				last_write = val;
			}
		} else if (port == ppbase + PP_STATUS) {
			DPRINTF("status port (last write: 0x%x)\n", last_write);
			switch(tr[i].cmdTrans) {
				case PP_READ:
					data = *readpos;

#ifdef DEBUG
					DPRINTF("READ: 0x%x\n", data);
					jtagkey_state(data);
#endif

					val = 0x00;
					if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
						val |= PP_TDO;

					if (~last_write & PP_PROG)
						val |= 0x08;

					if (last_write & 0x40)
						val |= 0x20;
					else
						val |= 0x80;
					break;

				case PP_WRITE:
					ret = 0; /* Status Port is readonly */
					break;

				default:
					fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
					ret = -1;
					break;
			}
		} else {
			ret = 0;
		}

		tr[i].Data.Byte = val;

		DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
				(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
				tr[i].fAutoinc, tr[i].dwOptions);
#ifdef DEBUG
		if (tr[i].cmdTrans == 10)
			DPRINTF("read byte: %d\n", tr[i].Data.Byte);
#endif
	}

	return ret;
}
Commit	Line	Data
8121bc50	1	#include <stdio.h>
8121bc50	2	#include <ftdi.h>
9640dec9	3	#include <unistd.h>
3cc5a0bc	4	#include <pthread.h>
8121bc50	5	#include "usb-driver.h"
5e3d963b	6	#include "config.h"
8121bc50	7	#include "jtagkey.h"
0a060ead	8	#include "jtagmon.h"
8121bc50	9
3cc5a0bc	10	#define USBBUFSIZE 1048576
66c1fd53	11	#define JTAG_SPEED 100000
f9318fa1	12	#define BULK_LATENCY 2
f9318fa1	13	#define OTHER_LATENCY 1
d0e2002d	14
8121bc50	15	static struct ftdi_context ftdic;
f9318fa1	16
	17	static int jtagkey_latency(int latency) {
	18	static int current = 0;
	19	int ret;
	20
	21	if (current != latency) {
	22	DPRINTF("switching latency\n");
	23	if ((ret = ftdi_set_latency_timer(&ftdic, latency)) != 0) {
	24	fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	25	return ret;
	26	}
	27
	28	current = latency;
	29	}
	30
	31	return ret;
	32	}
8121bc50	33
5e3d963b	34	static int jtagkey_init(unsigned short vid, unsigned short pid) {
8121bc50	35	int ret = 0;
d0e2002d	36	unsigned char c;
8121bc50	37
	38	if ((ret = ftdi_init(&ftdic)) != 0) {
	39	fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	40	return ret;
	41	}
	42
	43	if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
	44	fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	45	return ret;
	46	}
	47
	48	if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
	49	fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	50	return ret;
	51	}
	52
	53	if ((ret = ftdi_set_interface(&ftdic, INTERFACE_A)) != 0) {
	54	fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	55	return ret;
	56	}
	57
3cc5a0bc	58	if ((ret = ftdi_write_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
	59	fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	60	return ret;
	61	}
4af4753d	62
3cc5a0bc	63	if ((ret = ftdi_read_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
3cc5a0bc	64	fprintf(stderr, "unable to set read chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
8121bc50	65	return ret;
	66	}
	67
f9318fa1	68	if ((ret = jtagkey_latency(OTHER_LATENCY)) != 0)
8121bc50	69	return ret;
8121bc50	70
d0e2002d	71	c = 0x00;
	72	ftdi_write_data(&ftdic, &c, 1);
	73
75417531	74	if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK\|JTAGKEY_TDI\|JTAGKEY_TMS\|JTAGKEY_OEn, BITMODE_SYNCBB)) != 0) {
8121bc50	75	fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	76	return ret;
	77	}
	78
66c1fd53	79	if ((ret = ftdi_set_baudrate(&ftdic, JTAG_SPEED)) != 0) {
	80	fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	81	return ret;
	82	}
	83
8121bc50	84	if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
	85	fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	86	return ret;
	87	}
	88
	89	return ret;
	90	}
	91
5e3d963b	92	int jtagkey_open(int num) {
	93	int ret;
	94
	95	ret = jtagkey_init(config_usb_vid(num), config_usb_pid(num));
	96
	97	if (ret >= 0)
	98	ret = 0xff;
	99
	100	return ret;
	101	}
	102
	103	void jtagkey_close(int handle) {
	104	if (handle == 0xff) {
	105	ftdi_disable_bitbang(&ftdic);
	106	ftdi_usb_close(&ftdic);
	107	ftdi_deinit(&ftdic);
	108	}
8121bc50	109	}
	110
	111	void jtagkey_state(unsigned char data) {
	112	fprintf(stderr,"Pins high: ");
	113
	114	if (data & JTAGKEY_TCK)
	115	fprintf(stderr,"TCK ");
	116
	117	if (data & JTAGKEY_TDI)
	118	fprintf(stderr,"TDI ");
	119
	120	if (data & JTAGKEY_TDO)
	121	fprintf(stderr,"TDO ");
	122
	123	if (data & JTAGKEY_TMS)
	124	fprintf(stderr,"TMS ");
	125
	126	if (data & JTAGKEY_VREF)
	127	fprintf(stderr,"VREF ");
	128
	129	fprintf(stderr,"\n");
	130	}
	131
3cc5a0bc	132	struct jtagkey_reader_arg {
	133	int num;
	134	unsigned char *buf;
	135	};
	136
	137	static void jtagkey_reader(void thread_arg) {
	138	struct jtagkey_reader_arg arg = (struct jtagkey_reader_arg)thread_arg;
3cc5a0bc	139	int i;
	140
	141	i = 0;
	142	DPRINTF("reader for %d bytes\n", arg->num);
	143	while (i < arg->num) {
	144	i += ftdi_read_data(&ftdic, arg->buf + i, arg->num - i);
	145	}
	146
	147	pthread_exit(NULL);
	148	}
	149
617583d0	150	/* TODO: Interpret JTAG commands and transfer in MPSSE mode */
8121bc50	151	int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
	152	int ret = 0;
	153	int i;
d0e2002d	154	int nread = 0;
8121bc50	155	unsigned long port;
8121bc50	156	unsigned char val;
d0e2002d	157	static unsigned char last_data = 0;
e81047b8	158	static unsigned char last_write = 0x00;
d0e2002d	159	static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
d0e2002d	160	static unsigned char readbuf[USBBUFSIZE], *readpos;
617583d0	161	unsigned char data, prev_data, last_cyc_write;
3cc5a0bc	162	struct jtagkey_reader_arg targ;
3cc5a0bc	163	pthread_t reader_thread;
d0e2002d	164
e81047b8	165	/* Count reads */
d0e2002d	166	for (i = 0; i < num; i++)
e81047b8	167	if (tr[i].cmdTrans == PP_READ)
d0e2002d	168	nread++;
	169
	170	/* Write combining */
	171	if ((writepos-writebuf > sizeof(writebuf)-num) \|\| (nread && writepos-writebuf)) {
4af4753d	172	unsigned char *pos = writebuf;
4af4753d	173	int len;
3cc5a0bc	174
d0e2002d	175	DPRINTF("writing %d bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
f9318fa1	176	jtagkey_latency(BULK_LATENCY);
d0e2002d	177
3cc5a0bc	178	targ.num = writepos-pos;
	179	targ.buf = readbuf;
	180	pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
f9318fa1	181
4af4753d	182	while (pos < writepos) {
85690a3f	183	len = writepos-pos;
85690a3f	184
3cc5a0bc	185	if (len > USBBUFSIZE)
3cc5a0bc	186	len = USBBUFSIZE;
d0e2002d	187
4af4753d	188	DPRINTF("combined write of %d/%d\n",len,writepos-pos);
	189	ftdi_write_data(&ftdic, pos, len);
	190	pos += len;
e81047b8	191	}
3cc5a0bc	192	pthread_join(reader_thread, NULL);
4af4753d	193
d0e2002d	194	writepos = writebuf;
d0e2002d	195	}
8121bc50	196
617583d0	197	last_cyc_write = last_write;
617583d0	198
8121bc50	199	for (i = 0; i < num; i++) {
	200	DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	201	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	202	tr[i].fAutoinc, tr[i].dwOptions);
	203
	204	port = (unsigned long)tr[i].dwPort;
	205	val = tr[i].Data.Byte;
	206
	207	#ifdef DEBUG
	208	if (tr[i].cmdTrans == 13)
	209	DPRINTF("write byte: %d\n", val);
0a060ead	210
0a060ead	211	if (tr[i].cmdTrans == 13)
084feb4b	212	jtagmon(val & PP_TCK, val & PP_TMS, val & PP_TDI);
8121bc50	213	#endif
8121bc50	214
b122ac4b	215	/* Pad writebuf for read-commands in stream */
d0e2002d	216	*writepos = last_data;
e81047b8	217	prev_data = last_data;
b122ac4b	218
8121bc50	219	if (port == ppbase + PP_DATA) {
	220	DPRINTF("data port\n");
	221
	222	data = 0x00;
	223	switch(tr[i].cmdTrans) {
	224	case PP_READ:
	225	ret = 0; /* We don't support reading of the data port */
	226	break;
	227
	228	case PP_WRITE:
	229	if (val & PP_TDI) {
	230	data \|= JTAGKEY_TDI;
	231	DPRINTF("TDI\n");
	232	} else {
	233	DPRINTF("!TDI\n");
	234	}
	235	if (val & PP_TCK) {
	236	data \|= JTAGKEY_TCK;
	237	DPRINTF("TCK\n");
	238	} else {
	239	DPRINTF("!TCK\n");
	240	}
	241	if (val & PP_TMS) {
	242	data \|= JTAGKEY_TMS;
	243	DPRINTF("TMS\n");
	244	} else {
	245	DPRINTF("!TMS\n");
	246	}
	247	if (val & PP_CTRL) {
d0e2002d	248	data = JTAGKEY_OEn;
8121bc50	249	DPRINTF("CTRL\n");
	250	} else {
	251	DPRINTF("!CTRL\n");
	252	}
8121bc50	253
d0e2002d	254	if (val & PP_PROG) {
	255	DPRINTF("PROG\n");
	256	} else {
	257	DPRINTF("!PROG\n");
	258	}
	259
	260	*writepos = data;
	261
b122ac4b	262	last_data = data;
d0e2002d	263	last_write = val;
8121bc50	264	break;
	265
	266	default:
	267	fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
	268	ret = -1;
	269	break;
	270	}
b122ac4b	271	}
e81047b8	272
617583d0	273	if ((tr[i].cmdTrans == PP_READ) \|\| (*writepos != prev_data) \|\| (i == num-1))
e81047b8	274	writepos++;
b122ac4b	275	}
b122ac4b	276
d0e2002d	277	if (nread)
	278	{
	279	DPRINTF("writing %d bytes\n", writepos-writebuf);
59b06a85	280
	281	*writepos = last_data;
	282	writepos++;
	283
f9318fa1	284	jtagkey_latency(OTHER_LATENCY);
f9318fa1	285
3cc5a0bc	286	targ.num = writepos-writebuf;
	287	targ.buf = readbuf;
	288	pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
9640dec9	289	ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
3cc5a0bc	290	pthread_join(reader_thread, NULL);
b122ac4b	291
b122ac4b	292	#ifdef DEBUG
d0e2002d	293	DPRINTF("write: ");
	294	hexdump(writebuf, writepos-writebuf);
	295	DPRINTF("read: ");
	296	hexdump(readbuf, i);
b122ac4b	297	#endif
b122ac4b	298
d0e2002d	299	writepos = writebuf;
	300	} else {
	301	return ret;
	302	}
	303
	304	readpos = readbuf;
617583d0	305	last_write = last_cyc_write;
b122ac4b	306
	307	for (i = 0; i < num; i++) {
	308	DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	309	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	310	tr[i].fAutoinc, tr[i].dwOptions);
	311
	312	port = (unsigned long)tr[i].dwPort;
	313	val = tr[i].Data.Byte;
617583d0	314
	315	if ((tr[i].cmdTrans != PP_READ) && (val == last_write) && (i != num-1))
	316	continue;
	317
d0e2002d	318	readpos++;
b122ac4b	319
d0e2002d	320	if (port == ppbase + PP_DATA) {
	321	if (tr[i].cmdTrans == PP_WRITE) {
	322	last_write = val;
	323	}
	324	} else if (port == ppbase + PP_STATUS) {
	325	DPRINTF("status port (last write: 0x%x)\n", last_write);
8121bc50	326	switch(tr[i].cmdTrans) {
8121bc50	327	case PP_READ:
d0e2002d	328	data = *readpos;
59b06a85	329
8121bc50	330	#ifdef DEBUG
	331	DPRINTF("READ: 0x%x\n", data);
	332	jtagkey_state(data);
	333	#endif
	334
	335	val = 0x00;
d0e2002d	336	if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
8121bc50	337	val \|= PP_TDO;
8121bc50	338
617583d0	339	if (~last_write & PP_PROG)
d0e2002d	340	val \|= 0x08;
d0e2002d	341
8121bc50	342	if (last_write & 0x40)
	343	val \|= 0x20;
	344	else
	345	val \|= 0x80;
	346	break;
	347
	348	case PP_WRITE:
	349	ret = 0; /* Status Port is readonly */
	350	break;
	351
	352	default:
	353	fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
	354	ret = -1;
	355	break;
	356	}
8121bc50	357	} else {
8121bc50	358	ret = 0;
	359	}
	360
	361	tr[i].Data.Byte = val;
	362
	363	DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	364	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	365	tr[i].fAutoinc, tr[i].dwOptions);
	366	#ifdef DEBUG
	367	if (tr[i].cmdTrans == 10)
	368	DPRINTF("read byte: %d\n", tr[i].Data.Byte);
	369	#endif
	370	}
	371
	372	return ret;
	373	}