[usb-driver] / jtagkey.c

#include <stdio.h>
#include <ftdi.h>
#include <unistd.h>
#include <pthread.h>
#include <inttypes.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, unsigned short iface) {
	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_set_interface(&ftdic, iface)) != 0) {
		fprintf(stderr, "unable to set interface: %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_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), config_usb_iface(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);
	}
}

#ifdef DEBUG
static 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");
}
#endif

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 %zd 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/%zd\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 %zd 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
		hexdump(writebuf, writepos-writebuf, "->");
		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>
4c7a69cb	5	#include <inttypes.h>
8121bc50	6	#include "usb-driver.h"
5e3d963b	7	#include "config.h"
8121bc50	8	#include "jtagkey.h"
0a060ead	9	#include "jtagmon.h"
8121bc50	10
3cc5a0bc	11	#define USBBUFSIZE 1048576
66c1fd53	12	#define JTAG_SPEED 100000
f9318fa1	13	#define BULK_LATENCY 2
f9318fa1	14	#define OTHER_LATENCY 1
d0e2002d	15
8121bc50	16	static struct ftdi_context ftdic;
f9318fa1	17
	18	static int jtagkey_latency(int latency) {
	19	static int current = 0;
	20	int ret;
	21
	22	if (current != latency) {
	23	DPRINTF("switching latency\n");
	24	if ((ret = ftdi_set_latency_timer(&ftdic, latency)) != 0) {
	25	fprintf(stderr, "unable to set latency timer: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	26	return ret;
	27	}
	28
	29	current = latency;
	30	}
	31
	32	return ret;
	33	}
8121bc50	34
66156306	35	static int jtagkey_init(unsigned short vid, unsigned short pid, unsigned short iface) {
8121bc50	36	int ret = 0;
d0e2002d	37	unsigned char c;
8121bc50	38
	39	if ((ret = ftdi_init(&ftdic)) != 0) {
	40	fprintf(stderr, "unable to initialise libftdi: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	41	return ret;
	42	}
	43
7c932f66 MD	44	if ((ret = ftdi_set_interface(&ftdic, iface)) != 0) {
	45	fprintf(stderr, "unable to set interface: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	46	return ret;
	47	}
	48
8121bc50	49	if ((ret = ftdi_usb_open(&ftdic, vid, pid)) != 0) {
	50	fprintf(stderr, "unable to open ftdi device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	51	return ret;
	52	}
	53
	54	if ((ret = ftdi_usb_reset(&ftdic)) != 0) {
	55	fprintf(stderr, "unable reset device: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	56	return ret;
	57	}
	58
3cc5a0bc	59	if ((ret = ftdi_write_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
	60	fprintf(stderr, "unable to set write chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	61	return ret;
	62	}
4af4753d	63
3cc5a0bc	64	if ((ret = ftdi_read_data_set_chunksize(&ftdic, USBBUFSIZE)) != 0) {
3cc5a0bc	65	fprintf(stderr, "unable to set read chunksize: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
8121bc50	66	return ret;
	67	}
	68
f9318fa1	69	if ((ret = jtagkey_latency(OTHER_LATENCY)) != 0)
8121bc50	70	return ret;
8121bc50	71
d0e2002d	72	c = 0x00;
	73	ftdi_write_data(&ftdic, &c, 1);
	74
75417531	75	if ((ret = ftdi_set_bitmode(&ftdic, JTAGKEY_TCK\|JTAGKEY_TDI\|JTAGKEY_TMS\|JTAGKEY_OEn, BITMODE_SYNCBB)) != 0) {
8121bc50	76	fprintf(stderr, "unable to enable bitbang mode: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	77	return ret;
	78	}
	79
66c1fd53	80	if ((ret = ftdi_set_baudrate(&ftdic, JTAG_SPEED)) != 0) {
	81	fprintf(stderr, "unable to set baudrate: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	82	return ret;
	83	}
	84
8121bc50	85	if ((ret = ftdi_usb_purge_buffers(&ftdic)) != 0) {
	86	fprintf(stderr, "unable to purge buffers: %d (%s)\n", ret, ftdi_get_error_string(&ftdic));
	87	return ret;
	88	}
	89
	90	return ret;
	91	}
	92
5e3d963b	93	int jtagkey_open(int num) {
	94	int ret;
	95
66156306	96	ret = jtagkey_init(config_usb_vid(num), config_usb_pid(num), config_usb_iface(num));
5e3d963b	97
	98	if (ret >= 0)
	99	ret = 0xff;
	100
	101	return ret;
	102	}
	103
	104	void jtagkey_close(int handle) {
	105	if (handle == 0xff) {
	106	ftdi_disable_bitbang(&ftdic);
	107	ftdi_usb_close(&ftdic);
	108	ftdi_deinit(&ftdic);
	109	}
8121bc50	110	}
8121bc50	111
be59993b MG	112	#ifdef DEBUG
be59993b MG	113	static void jtagkey_state(unsigned char data) {
8121bc50	114	fprintf(stderr,"Pins high: ");
	115
	116	if (data & JTAGKEY_TCK)
	117	fprintf(stderr,"TCK ");
	118
	119	if (data & JTAGKEY_TDI)
	120	fprintf(stderr,"TDI ");
	121
	122	if (data & JTAGKEY_TDO)
	123	fprintf(stderr,"TDO ");
	124
	125	if (data & JTAGKEY_TMS)
	126	fprintf(stderr,"TMS ");
	127
	128	if (data & JTAGKEY_VREF)
	129	fprintf(stderr,"VREF ");
	130
	131	fprintf(stderr,"\n");
	132	}
be59993b	133	#endif
8121bc50	134
3cc5a0bc	135	struct jtagkey_reader_arg {
	136	int num;
	137	unsigned char *buf;
	138	};
	139
	140	static void jtagkey_reader(void thread_arg) {
	141	struct jtagkey_reader_arg arg = (struct jtagkey_reader_arg)thread_arg;
3cc5a0bc	142	int i;
	143
	144	i = 0;
	145	DPRINTF("reader for %d bytes\n", arg->num);
	146	while (i < arg->num) {
	147	i += ftdi_read_data(&ftdic, arg->buf + i, arg->num - i);
	148	}
	149
	150	pthread_exit(NULL);
	151	}
	152
617583d0	153	/* TODO: Interpret JTAG commands and transfer in MPSSE mode */
8121bc50	154	int jtagkey_transfer(WD_TRANSFER *tr, int fd, unsigned int request, int ppbase, int ecpbase, int num) {
	155	int ret = 0;
	156	int i;
d0e2002d	157	int nread = 0;
8121bc50	158	unsigned long port;
8121bc50	159	unsigned char val;
d0e2002d	160	static unsigned char last_data = 0;
e81047b8	161	static unsigned char last_write = 0x00;
d0e2002d	162	static unsigned char writebuf[USBBUFSIZE], *writepos = writebuf;
d0e2002d	163	static unsigned char readbuf[USBBUFSIZE], *readpos;
617583d0	164	unsigned char data, prev_data, last_cyc_write;
3cc5a0bc	165	struct jtagkey_reader_arg targ;
3cc5a0bc	166	pthread_t reader_thread;
d0e2002d	167
e81047b8	168	/* Count reads */
d0e2002d	169	for (i = 0; i < num; i++)
e81047b8	170	if (tr[i].cmdTrans == PP_READ)
d0e2002d	171	nread++;
	172
	173	/* Write combining */
	174	if ((writepos-writebuf > sizeof(writebuf)-num) \|\| (nread && writepos-writebuf)) {
4af4753d	175	unsigned char *pos = writebuf;
4af4753d	176	int len;
3cc5a0bc	177
98b8ef39	178	DPRINTF("writing %zd bytes due to %d following reads in %d chunks or full buffer\n", writepos-writebuf, nread, num);
f9318fa1	179	jtagkey_latency(BULK_LATENCY);
d0e2002d	180
3cc5a0bc	181	targ.num = writepos-pos;
	182	targ.buf = readbuf;
	183	pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
f9318fa1	184
4af4753d	185	while (pos < writepos) {
85690a3f	186	len = writepos-pos;
85690a3f	187
3cc5a0bc	188	if (len > USBBUFSIZE)
3cc5a0bc	189	len = USBBUFSIZE;
d0e2002d	190
98b8ef39	191	DPRINTF("combined write of %d/%zd\n",len,writepos-pos);
4af4753d	192	ftdi_write_data(&ftdic, pos, len);
4af4753d	193	pos += len;
e81047b8	194	}
3cc5a0bc	195	pthread_join(reader_thread, NULL);
4af4753d	196
d0e2002d	197	writepos = writebuf;
d0e2002d	198	}
8121bc50	199
617583d0	200	last_cyc_write = last_write;
617583d0	201
8121bc50	202	for (i = 0; i < num; i++) {
	203	DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	204	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	205	tr[i].fAutoinc, tr[i].dwOptions);
	206
	207	port = (unsigned long)tr[i].dwPort;
	208	val = tr[i].Data.Byte;
	209
	210	#ifdef DEBUG
	211	if (tr[i].cmdTrans == 13)
	212	DPRINTF("write byte: %d\n", val);
0a060ead	213
0a060ead	214	if (tr[i].cmdTrans == 13)
084feb4b	215	jtagmon(val & PP_TCK, val & PP_TMS, val & PP_TDI);
8121bc50	216	#endif
8121bc50	217
b122ac4b	218	/* Pad writebuf for read-commands in stream */
d0e2002d	219	*writepos = last_data;
e81047b8	220	prev_data = last_data;
b122ac4b	221
8121bc50	222	if (port == ppbase + PP_DATA) {
	223	DPRINTF("data port\n");
	224
	225	data = 0x00;
	226	switch(tr[i].cmdTrans) {
	227	case PP_READ:
	228	ret = 0; /* We don't support reading of the data port */
	229	break;
	230
	231	case PP_WRITE:
	232	if (val & PP_TDI) {
	233	data \|= JTAGKEY_TDI;
	234	DPRINTF("TDI\n");
	235	} else {
	236	DPRINTF("!TDI\n");
	237	}
	238	if (val & PP_TCK) {
	239	data \|= JTAGKEY_TCK;
	240	DPRINTF("TCK\n");
	241	} else {
	242	DPRINTF("!TCK\n");
	243	}
	244	if (val & PP_TMS) {
	245	data \|= JTAGKEY_TMS;
	246	DPRINTF("TMS\n");
	247	} else {
	248	DPRINTF("!TMS\n");
	249	}
	250	if (val & PP_CTRL) {
d0e2002d	251	data = JTAGKEY_OEn;
8121bc50	252	DPRINTF("CTRL\n");
	253	} else {
	254	DPRINTF("!CTRL\n");
	255	}
8121bc50	256
d0e2002d	257	if (val & PP_PROG) {
	258	DPRINTF("PROG\n");
	259	} else {
	260	DPRINTF("!PROG\n");
	261	}
	262
	263	*writepos = data;
	264
b122ac4b	265	last_data = data;
d0e2002d	266	last_write = val;
8121bc50	267	break;
	268
	269	default:
	270	fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
	271	ret = -1;
	272	break;
	273	}
b122ac4b	274	}
e81047b8	275
617583d0	276	if ((tr[i].cmdTrans == PP_READ) \|\| (*writepos != prev_data) \|\| (i == num-1))
e81047b8	277	writepos++;
b122ac4b	278	}
b122ac4b	279
d0e2002d	280	if (nread)
d0e2002d	281	{
98b8ef39	282	DPRINTF("writing %zd bytes\n", writepos-writebuf);
59b06a85	283
	284	*writepos = last_data;
	285	writepos++;
	286
f9318fa1	287	jtagkey_latency(OTHER_LATENCY);
f9318fa1	288
3cc5a0bc	289	targ.num = writepos-writebuf;
	290	targ.buf = readbuf;
	291	pthread_create(&reader_thread, NULL, &jtagkey_reader, &targ);
9640dec9	292	ftdi_write_data(&ftdic, writebuf, writepos-writebuf);
3cc5a0bc	293	pthread_join(reader_thread, NULL);
b122ac4b	294
b122ac4b	295	#ifdef DEBUG
325556c9 MG	296	hexdump(writebuf, writepos-writebuf, "->");
325556c9 MG	297	hexdump(readbuf, i, "<-");
b122ac4b	298	#endif
b122ac4b	299
d0e2002d	300	writepos = writebuf;
	301	} else {
	302	return ret;
	303	}
	304
	305	readpos = readbuf;
617583d0	306	last_write = last_cyc_write;
b122ac4b	307
	308	for (i = 0; i < num; i++) {
	309	DPRINTF("dwPort: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	310	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	311	tr[i].fAutoinc, tr[i].dwOptions);
	312
	313	port = (unsigned long)tr[i].dwPort;
	314	val = tr[i].Data.Byte;
617583d0	315
	316	if ((tr[i].cmdTrans != PP_READ) && (val == last_write) && (i != num-1))
	317	continue;
	318
d0e2002d	319	readpos++;
b122ac4b	320
d0e2002d	321	if (port == ppbase + PP_DATA) {
	322	if (tr[i].cmdTrans == PP_WRITE) {
	323	last_write = val;
	324	}
	325	} else if (port == ppbase + PP_STATUS) {
	326	DPRINTF("status port (last write: 0x%x)\n", last_write);
8121bc50	327	switch(tr[i].cmdTrans) {
8121bc50	328	case PP_READ:
d0e2002d	329	data = *readpos;
59b06a85	330
8121bc50	331	#ifdef DEBUG
	332	DPRINTF("READ: 0x%x\n", data);
	333	jtagkey_state(data);
	334	#endif
	335
	336	val = 0x00;
d0e2002d	337	if ((data & JTAGKEY_TDO) && (last_write & PP_PROG))
8121bc50	338	val \|= PP_TDO;
8121bc50	339
617583d0	340	if (~last_write & PP_PROG)
d0e2002d	341	val \|= 0x08;
d0e2002d	342
8121bc50	343	if (last_write & 0x40)
	344	val \|= 0x20;
	345	else
	346	val \|= 0x80;
	347	break;
	348
	349	case PP_WRITE:
	350	ret = 0; /* Status Port is readonly */
	351	break;
	352
	353	default:
	354	fprintf(stderr,"!!!Unsupported TRANSFER command: %lu!!!\n", tr[i].cmdTrans);
	355	ret = -1;
	356	break;
	357	}
8121bc50	358	} else {
8121bc50	359	ret = 0;
	360	}
	361
	362	tr[i].Data.Byte = val;
	363
	364	DPRINTF("dwPortReturn: 0x%lx, cmdTrans: %lu, dwbytes: %ld, fautoinc: %ld, dwoptions: %ld\n",
	365	(unsigned long)tr[i].dwPort, tr[i].cmdTrans, tr[i].dwBytes,
	366	tr[i].fAutoinc, tr[i].dwOptions);
	367	#ifdef DEBUG
	368	if (tr[i].cmdTrans == 10)
	369	DPRINTF("read byte: %d\n", tr[i].Data.Byte);
	370	#endif
	371	}
	372
	373	return ret;
	374	}