aboutsummaryrefslogtreecommitdiffstats
path: root/serprog.c
blob: b207fd2d2e4c6d524f2013e388cbf65e75ef1953 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
/*
 * This file is part of the flashrom project.
 *
 * Copyright (C) 2009, 2011 Urja Rannikko <urjaman@gmail.com>
 * Copyright (C) 2009 Carl-Daniel Hailfinger
 *
 * 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "platform.h"

#include <stdio.h>
#if ! IS_WINDOWS /* stuff (presumably) needed for sockets only */
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#endif
#if IS_WINDOWS
#include <conio.h>
#else
#include <termios.h>
#endif
#include <string.h>
#include <errno.h>
#include "flash.h"
#include "programmer.h"
#include "chipdrivers.h"
#include "serprog.h"

#define MSGHEADER "serprog: "

static uint16_t sp_device_serbuf_size = 16;
static uint16_t sp_device_opbuf_size = 300;
/* Bitmap of supported commands */
static uint8_t sp_cmdmap[32];

/* sp_prev_was_write used to detect writes with contiguous addresses
	and combine them to write-n's */
static int sp_prev_was_write = 0;
/* sp_write_n_addr used as the starting addr of the currently
	combined write-n operation */
static uint32_t sp_write_n_addr;
/* The maximum length of an write_n operation; 0 = write-n not supported */
static uint32_t sp_max_write_n = 0;
/* The maximum length of a read_n operation; 0 = 2^24 */
static uint32_t sp_max_read_n = 0;

/* A malloc'd buffer for combining the operation's data
	and a counter that tells how much data is there. */
static uint8_t *sp_write_n_buf;
static uint32_t sp_write_n_bytes = 0;

/* sp_streamed_* used for flow control checking */
static unsigned int sp_streamed_transmit_ops = 0;
static unsigned int sp_streamed_transmit_bytes = 0;

/* sp_opbuf_usage used for counting the amount of
	on-device operation buffer used */
static int sp_opbuf_usage = 0;
/* if true causes sp_docommand to automatically check
	whether the command is supported before doing it */
static int sp_check_avail_automatic = 0;

#if ! IS_WINDOWS
static int sp_opensocket(char *ip, unsigned int port)
{
	int flag = 1;
	struct hostent *hostPtr = NULL;
	union { struct sockaddr_in si; struct sockaddr s; } sp = {};
	int sock;
	msg_pdbg(MSGHEADER "IP %s port %d\n", ip, port);
	sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	if (sock < 0) {
		msg_perr("Error: serprog cannot open socket: %s\n", strerror(errno));
		return -1;
	}
	hostPtr = gethostbyname(ip);
	if (NULL == hostPtr) {
		hostPtr = gethostbyaddr(ip, strlen(ip), AF_INET);
		if (NULL == hostPtr) {
			close(sock);
			msg_perr("Error: cannot resolve %s\n", ip);
			return -1;
		}
	}
	sp.si.sin_family = AF_INET;
	sp.si.sin_port = htons(port);
	(void)memcpy(&sp.si.sin_addr, hostPtr->h_addr_list[0], hostPtr->h_length);
	if (connect(sock, &sp.s, sizeof(sp.si)) < 0) {
		close(sock);
		msg_perr("Error: serprog cannot connect: %s\n", strerror(errno));
		return -1;
	}
	/* We are latency limited, and sometimes do write-write-read    *
	 * (write-n) - so enable TCP_NODELAY.				*/
	if (setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(int))) {
		close(sock);
		msg_perr("Error: serprog cannot set socket options: %s\n", strerror(errno));
		return -1;
	}
	return sock;
}
#endif

/* Synchronize: a bit tricky algorithm that tries to (and in my tests has *
 * always succeeded in) bring the serial protocol to known waiting-for-   *
 * command state - uses nonblocking I/O - rest of the driver uses         *
 * blocking read - TODO: add an alarm() timer for the rest of the app on  *
 * serial operations, though not such a big issue as the first thing to   *
 * do is synchronize (eg. check that device is alive).			  */
static int sp_synchronize(void)
{
	int i;
	unsigned char buf[8];
	/* First sends 8 NOPs, then flushes the return data - should cause *
	 * the device serial parser to get to a sane state, unless if it   *
	 * is waiting for a real long write-n.                             */
	memset(buf, S_CMD_NOP, 8);
	if (serialport_write_nonblock(buf, 8, 1, NULL) != 0) {
		goto err_out;
	}
	/* A second should be enough to get all the answers to the buffer */
	internal_delay(1000 * 1000);
	sp_flush_incoming();

	/* Then try up to 8 times to send syncnop and get the correct special *
	 * return of NAK+ACK. Timing note: up to 10 characters, 10*50ms =     *
	 * up to 500ms per try, 8*0.5s = 4s; +1s (above) = up to 5s sync      *
	 * attempt, ~1s if immediate success.                                 */
	for (i = 0; i < 8; i++) {
		int n;
		unsigned char c = S_CMD_SYNCNOP;
		if (serialport_write_nonblock(&c, 1, 1, NULL) != 0) {
			goto err_out;
		}
		msg_pdbg(".");
		fflush(stdout);
		for (n = 0; n < 10; n++) {
			int ret = serialport_read_nonblock(&c, 1, 50, NULL);
			if (ret < 0)
				goto err_out;
			if (ret > 0 || c != S_NAK)
				continue;
			ret = serialport_read_nonblock(&c, 1, 20, NULL);
			if (ret < 0)
				goto err_out;
			if (ret > 0 || c != S_ACK)
				continue;
			c = S_CMD_SYNCNOP;
			if (serialport_write_nonblock(&c, 1, 1, NULL) != 0) {
				goto err_out;
			}
			ret = serialport_read_nonblock(&c, 1, 500, NULL);
			if (ret < 0)
				goto err_out;
			if (ret > 0 || c != S_NAK)
				break;	/* fail */
			ret = serialport_read_nonblock(&c, 1, 100, NULL);
			if (ret > 0 || ret < 0)
				goto err_out;
			if (c != S_ACK)
				break;	/* fail */
			msg_pdbg("\n");
			return 0;
		}
	}
err_out:
	msg_perr("Error: cannot synchronize protocol - check communications and reset device?\n");
	return 1;
}

static int sp_check_commandavail(uint8_t command)
{
	int byteoffs, bitoffs;
	byteoffs = command / 8;
	bitoffs = command % 8;
	return (sp_cmdmap[byteoffs] & (1 << bitoffs)) ? 1 : 0;
}

static int sp_automatic_cmdcheck(uint8_t cmd)
{
	if ((sp_check_avail_automatic) && (sp_check_commandavail(cmd) == 0)) {
		msg_pdbg("Warning: Automatic command availability check failed "
			 "for cmd 0x%02x - won't execute cmd\n", cmd);
		return 1;
		}
	return 0;
}

static int sp_docommand(uint8_t command, uint32_t parmlen,
			uint8_t *params, uint32_t retlen, void *retparms)
{
	unsigned char c;
	if (sp_automatic_cmdcheck(command))
		return 1;
	if (serialport_write(&command, 1) != 0) {
		msg_perr("Error: cannot write op code: %s\n", strerror(errno));
		return 1;
	}
	if (serialport_write(params, parmlen) != 0) {
		msg_perr("Error: cannot write parameters: %s\n", strerror(errno));
		return 1;
	}
	if (serialport_read(&c, 1) != 0) {
		msg_perr("Error: cannot read from device: %s\n", strerror(errno));
		return 1;
	}
	if (c == S_NAK)
		return 1;
	if (c != S_ACK) {
		msg_perr("Error: invalid response 0x%02X from device (to command 0x%02X)\n", c, command);
		return 1;
	}
	if (retlen) {
		if (serialport_read(retparms, retlen) != 0) {
			msg_perr("Error: cannot read return parameters: %s\n", strerror(errno));
			return 1;
		}
	}
	return 0;
}

static int sp_flush_stream(void)
{
	if (sp_streamed_transmit_ops)
		do {
			unsigned char c;
			if (serialport_read(&c, 1) != 0) {
				msg_perr("Error: cannot read from device (flushing stream)");
				return 1;
			}
			if (c == S_NAK) {
				msg_perr("Error: NAK to a stream buffer operation\n");
				return 1;
			}
			if (c != S_ACK) {
				msg_perr("Error: Invalid reply 0x%02X from device\n", c);
				return 1;
			}
		} while (--sp_streamed_transmit_ops);
	sp_streamed_transmit_ops = 0;
	sp_streamed_transmit_bytes = 0;
	return 0;
}

static int sp_stream_buffer_op(uint8_t cmd, uint32_t parmlen, uint8_t *parms)
{
	uint8_t *sp;
	if (sp_automatic_cmdcheck(cmd))
		return 1;

	sp = malloc(1 + parmlen);
	if (!sp) {
		msg_perr("Error: cannot malloc command buffer\n");
		return 1;
	}
	sp[0] = cmd;
	memcpy(&(sp[1]), parms, parmlen);

	if (sp_streamed_transmit_bytes >= (1 + parmlen + sp_device_serbuf_size)) {
		if (sp_flush_stream() != 0) {
			free(sp);
			return 1;
		}
	}
	if (serialport_write(sp, 1 + parmlen) != 0) {
		msg_perr("Error: cannot write command\n");
		free(sp);
		return 1;
	}
	sp_streamed_transmit_ops += 1;
	sp_streamed_transmit_bytes += 1 + parmlen;

	free(sp);
	return 0;
}

/* Move an in flashrom buffer existing write-n operation to the on-device operation buffer. */
static int sp_pass_writen(void)
{
	unsigned char header[7];
	msg_pspew(MSGHEADER "Passing write-n bytes=%d addr=0x%x\n", sp_write_n_bytes, sp_write_n_addr);
	if (sp_streamed_transmit_bytes >= (7 + sp_write_n_bytes + sp_device_serbuf_size)) {
		if (sp_flush_stream() != 0) {
			return 1;
		}
	}
	/* In case it's just a single byte send it as a single write. */
	if (sp_write_n_bytes == 1) {
		sp_write_n_bytes = 0;
		header[0] = (sp_write_n_addr >> 0) & 0xFF;
		header[1] = (sp_write_n_addr >> 8) & 0xFF;
		header[2] = (sp_write_n_addr >> 16) & 0xFF;
		header[3] = sp_write_n_buf[0];
		if (sp_stream_buffer_op(S_CMD_O_WRITEB, 4, header) != 0)
			return 1;
		sp_opbuf_usage += 5;
		return 0;
	}
	header[0] = S_CMD_O_WRITEN;
	header[1] = (sp_write_n_bytes >> 0) & 0xFF;
	header[2] = (sp_write_n_bytes >> 8) & 0xFF;
	header[3] = (sp_write_n_bytes >> 16) & 0xFF;
	header[4] = (sp_write_n_addr >> 0) & 0xFF;
	header[5] = (sp_write_n_addr >> 8) & 0xFF;
	header[6] = (sp_write_n_addr >> 16) & 0xFF;
	if (serialport_write(header, 7) != 0) {
		msg_perr(MSGHEADER "Error: cannot write write-n command\n");
		return 1;
	}
	if (serialport_write(sp_write_n_buf, sp_write_n_bytes) != 0) {
		msg_perr(MSGHEADER "Error: cannot write write-n data");
		return 1;
	}
	sp_streamed_transmit_bytes += 7 + sp_write_n_bytes;
	sp_streamed_transmit_ops += 1;
	sp_opbuf_usage += 7 + sp_write_n_bytes;
	sp_write_n_bytes = 0;
	sp_prev_was_write = 0;
	return 0;
}

static int sp_execute_opbuf_noflush(void)
{
	if ((sp_max_write_n) && (sp_write_n_bytes)) {
		if (sp_pass_writen() != 0) {
			msg_perr("Error: could not transfer write buffer\n");
			return 1;
		}
	}
	if (sp_stream_buffer_op(S_CMD_O_EXEC, 0, NULL) != 0) {
		msg_perr("Error: could not execute command buffer\n");
		return 1;
	}
	msg_pspew(MSGHEADER "Executed operation buffer of %d bytes\n", sp_opbuf_usage);
	sp_opbuf_usage = 0;
	sp_prev_was_write = 0;
	return 0;
}

static int sp_execute_opbuf(void)
{
	if (sp_execute_opbuf_noflush() != 0)
		return 1;
	if (sp_flush_stream() != 0)
		return 1;

	return 0;
}

static int serprog_spi_send_command(const struct flashctx *flash,
				    unsigned int writecnt, unsigned int readcnt,
				    const unsigned char *writearr,
				    unsigned char *readarr)
{
	unsigned char *parmbuf;
	int ret;
	msg_pspew("%s, writecnt=%i, readcnt=%i\n", __func__, writecnt, readcnt);
	if ((sp_opbuf_usage) || (sp_max_write_n && sp_write_n_bytes)) {
		if (sp_execute_opbuf() != 0) {
			msg_perr("Error: could not execute command buffer before sending SPI commands.\n");
			return 1;
		}
	}

	parmbuf = malloc(writecnt + 6);
	if (!parmbuf) {
		msg_perr("Error: could not allocate SPI send param buffer.\n");
		return 1;
	}
	parmbuf[0] = (writecnt >> 0) & 0xFF;
	parmbuf[1] = (writecnt >> 8) & 0xFF;
	parmbuf[2] = (writecnt >> 16) & 0xFF;
	parmbuf[3] = (readcnt >> 0) & 0xFF;
	parmbuf[4] = (readcnt >> 8) & 0xFF;
	parmbuf[5] = (readcnt >> 16) & 0xFF;
	memcpy(parmbuf + 6, writearr, writecnt);
	ret = sp_docommand(S_CMD_O_SPIOP, writecnt + 6, parmbuf, readcnt,
			   readarr);
	free(parmbuf);
	return ret;
}

static int serprog_shutdown(void *data)
{
	if ((sp_opbuf_usage) || (sp_max_write_n && sp_write_n_bytes))
	if (sp_execute_opbuf() != 0)
		msg_pwarn("Could not flush command buffer.\n");
	if (sp_check_commandavail(S_CMD_S_PIN_STATE)) {
		uint8_t dis = 0;
		if (sp_docommand(S_CMD_S_PIN_STATE, 1, &dis, 0, NULL) == 0)
			msg_pdbg(MSGHEADER "Output drivers disabled\n");
		else
			msg_pwarn(MSGHEADER "%s: Warning: could not disable output buffers\n", __func__);
	}
	/* FIXME: fix sockets on windows(?), especially closing */
	serialport_shutdown(&sp_fd);
	if (sp_max_write_n)
		free(sp_write_n_buf);
	return 0;
}

static struct spi_master spi_master_serprog = {
	.features	= SPI_MASTER_4BA,
	.max_data_read	= MAX_DATA_READ_UNLIMITED,
	.max_data_write	= MAX_DATA_WRITE_UNLIMITED,
	.command	= serprog_spi_send_command,
	.multicommand	= default_spi_send_multicommand,
	.read		= default_spi_read,
	.write_256	= default_spi_write_256,
	.write_aai	= default_spi_write_aai,
};

static int sp_check_opbuf_usage(int bytes_to_be_added)
{
	if (sp_device_opbuf_size <= (sp_opbuf_usage + bytes_to_be_added)) {
		/* If this happens in the middle of a page load the page load will probably fail. */
		msg_pwarn(MSGHEADER "Warning: executed operation buffer due to size reasons\n");
		if (sp_execute_opbuf() != 0)
			return 1;
	}
	return 0;
}

static void serprog_chip_writeb(const struct flashctx *flash, uint8_t val,
				chipaddr addr)
{
	msg_pspew("%s\n", __func__);
	if (sp_max_write_n) {
		if ((sp_prev_was_write)
		    && (addr == (sp_write_n_addr + sp_write_n_bytes))) {
			sp_write_n_buf[sp_write_n_bytes++] = val;
		} else {
			if ((sp_prev_was_write) && (sp_write_n_bytes))
				sp_pass_writen();
			sp_prev_was_write = 1;
			sp_write_n_addr = addr;
			sp_write_n_bytes = 1;
			sp_write_n_buf[0] = val;
		}
		sp_check_opbuf_usage(7 + sp_write_n_bytes);
		if (sp_write_n_bytes >= sp_max_write_n)
			sp_pass_writen();
	} else {
		/* We will have to do single writeb ops. */
		unsigned char writeb_parm[4];
		sp_check_opbuf_usage(6);
		writeb_parm[0] = (addr >> 0) & 0xFF;
		writeb_parm[1] = (addr >> 8) & 0xFF;
		writeb_parm[2] = (addr >> 16) & 0xFF;
		writeb_parm[3] = val;
		sp_stream_buffer_op(S_CMD_O_WRITEB, 4, writeb_parm); // FIXME: return error
		sp_opbuf_usage += 5;
	}
}

static uint8_t serprog_chip_readb(const struct flashctx *flash,
				  const chipaddr addr)
{
	unsigned char c;
	unsigned char buf[3];
	/* Will stream the read operation - eg. add it to the stream buffer, *
	 * then flush the buffer, then read the read answer.		     */
	if ((sp_opbuf_usage) || (sp_max_write_n && sp_write_n_bytes))
		sp_execute_opbuf_noflush();
	buf[0] = ((addr >> 0) & 0xFF);
	buf[1] = ((addr >> 8) & 0xFF);
	buf[2] = ((addr >> 16) & 0xFF);
	sp_stream_buffer_op(S_CMD_R_BYTE, 3, buf); // FIXME: return error
	sp_flush_stream(); // FIXME: return error
	if (serialport_read(&c, 1) != 0)
		msg_perr(MSGHEADER "readb byteread");  // FIXME: return error
	msg_pspew("%s addr=0x%" PRIxPTR " returning 0x%02X\n", __func__, addr, c);
	return c;
}

/* Local version that really does the job, doesn't care of max_read_n. */
static int sp_do_read_n(uint8_t * buf, const chipaddr addr, size_t len)
{
	unsigned char sbuf[6];
	msg_pspew("%s: addr=0x%" PRIxPTR " len=%zu\n", __func__, addr, len);
	/* Stream the read-n -- as above. */
	if ((sp_opbuf_usage) || (sp_max_write_n && sp_write_n_bytes))
		sp_execute_opbuf_noflush();
	sbuf[0] = ((addr >> 0) & 0xFF);
	sbuf[1] = ((addr >> 8) & 0xFF);
	sbuf[2] = ((addr >> 16) & 0xFF);
	sbuf[3] = ((len >> 0) & 0xFF);
	sbuf[4] = ((len >> 8) & 0xFF);
	sbuf[5] = ((len >> 16) & 0xFF);
	sp_stream_buffer_op(S_CMD_R_NBYTES, 6, sbuf);
	if (sp_flush_stream() != 0)
		return 1;
	if (serialport_read(buf, len) != 0) {
		msg_perr(MSGHEADER "Error: cannot read read-n data");
		return 1;
	}
	return 0;
}

/* The externally called version that makes sure that max_read_n is obeyed. */
static void serprog_chip_readn(const struct flashctx *flash, uint8_t * buf,
			       const chipaddr addr, size_t len)
{
	size_t lenm = len;
	chipaddr addrm = addr;
	while ((sp_max_read_n != 0) && (lenm > sp_max_read_n)) {
		sp_do_read_n(&(buf[addrm-addr]), addrm, sp_max_read_n); // FIXME: return error
		addrm += sp_max_read_n;
		lenm -= sp_max_read_n;
	}
	if (lenm)
		sp_do_read_n(&(buf[addrm-addr]), addrm, lenm); // FIXME: return error
}

static const struct par_master par_master_serprog = {
		.chip_readb		= serprog_chip_readb,
		.chip_readw		= fallback_chip_readw,
		.chip_readl		= fallback_chip_readl,
		.chip_readn		= serprog_chip_readn,
		.chip_writeb		= serprog_chip_writeb,
		.chip_writew		= fallback_chip_writew,
		.chip_writel		= fallback_chip_writel,
		.chip_writen		= fallback_chip_writen,
};

static enum chipbustype serprog_buses_supported = BUS_NONE;

static int serprog_init(void)
{
	uint16_t iface;
	unsigned char pgmname[17];
	unsigned char rbuf[3];
	unsigned char c;
	char *device;
	int have_device = 0;

	/* the parameter is either of format "dev=/dev/device[:baud]" or "ip=ip:port" */
	device = extract_programmer_param("dev");
	if (device && strlen(device)) {
		char *baud_str = strstr(device, ":");
		if (baud_str != NULL) {
			/* Split device from baudrate. */
			*baud_str = '\0';
			baud_str++;
		}
		int baud;
		/* Convert baud string to value.
		 * baud_str is either NULL (if strstr can't find the colon), points to the \0 after the colon
		 * if no characters where given after the colon, or a string to convert... */
		if (baud_str == NULL || *baud_str == '\0') {
			baud = -1;
			msg_pdbg("No baudrate specified, using the hardware's defaults.\n");
		} else {
			baud = atoi(baud_str); // FIXME: replace atoi with strtoul
		}
		if (strlen(device) > 0) {
			sp_fd = sp_openserport(device, baud);
			if (sp_fd == SER_INV_FD) {
				free(device);
				return 1;
			}
			have_device++;
		}
	}

#if !IS_WINDOWS
	if (device && !strlen(device)) {
		msg_perr("Error: No device specified.\n"
			 "Use flashrom -p serprog:dev=/dev/device[:baud]\n");
		free(device);
		return 1;
	}
	free(device);

	device = extract_programmer_param("ip");
	if (have_device && device) {
		msg_perr("Error: Both host and device specified.\n"
			 "Please use either dev= or ip= but not both.\n");
		free(device);
		return 1;
	}
	if (device && strlen(device)) {
		char *port = strstr(device, ":");
		if (port != NULL) {
			/* Split host from port. */
			*port = '\0';
			port++;
		}
		if (!port || !strlen(port)) {
			msg_perr("Error: No port specified.\n"
				 "Use flashrom -p serprog:ip=ipaddr:port\n");
			free(device);
			return 1;
		}
		if (strlen(device)) {
			sp_fd = sp_opensocket(device, atoi(port)); // FIXME: replace atoi with strtoul
			if (sp_fd < 0) {
				free(device);
				return 1;
			}
			have_device++;
		}
	}
	if (device && !strlen(device)) {
		msg_perr("Error: No host specified.\n"
			 "Use flashrom -p serprog:ip=ipaddr:port\n");
		free(device);
		return 1;
	}
#endif
	free(device);

	if (!have_device) {
#if IS_WINDOWS
		msg_perr("Error: No device specified.\n"
			 "Use flashrom -p serprog:dev=comN[:baud]\n");
#else
		msg_perr("Error: Neither host nor device specified.\n"
			 "Use flashrom -p serprog:dev=/dev/device:baud or "
			 "flashrom -p serprog:ip=ipaddr:port\n");
#endif
		return 1;
	}

	msg_pdbg(MSGHEADER "connected - attempting to synchronize\n");

	sp_check_avail_automatic = 0;

	if (sp_synchronize())
		goto init_err_cleanup_exit;

	msg_pdbg(MSGHEADER "Synchronized\n");

	if (sp_docommand(S_CMD_Q_IFACE, 0, NULL, 2, &iface)) {
		msg_perr("Error: NAK to query interface version\n");
		goto init_err_cleanup_exit;
	}

	if (iface != 1) {
		msg_perr("Error: Unknown interface version: %d\n", iface);
		goto init_err_cleanup_exit;
	}

	msg_pdbg(MSGHEADER "Interface version ok.\n");

	if (sp_docommand(S_CMD_Q_CMDMAP, 0, NULL, 32, sp_cmdmap)) {
		msg_perr("Error: query command map not supported\n");
		goto init_err_cleanup_exit;
	}

	sp_check_avail_automatic = 1;

	/* FIXME: This assumes that serprog device bustypes are always
	 * identical with flashrom bustype enums and that they all fit
	 * in a single byte.
	 */
	if (sp_docommand(S_CMD_Q_BUSTYPE, 0, NULL, 1, &c)) {
		msg_pwarn("Warning: NAK to query supported buses\n");
		c = BUS_NONSPI;	/* A reasonable default for now. */
	}
	serprog_buses_supported = c;

	msg_pdbg(MSGHEADER "Bus support: parallel=%s, LPC=%s, FWH=%s, SPI=%s\n",
		 (c & BUS_PARALLEL) ? "on" : "off",
		 (c & BUS_LPC) ? "on" : "off",
		 (c & BUS_FWH) ? "on" : "off",
		 (c & BUS_SPI) ? "on" : "off");
	/* Check for the minimum operational set of commands. */
	if (serprog_buses_supported & BUS_SPI) {
		uint8_t bt = BUS_SPI;
		char *spispeed;
		if (sp_check_commandavail(S_CMD_O_SPIOP) == 0) {
			msg_perr("Error: SPI operation not supported while the "
				 "bustype is SPI\n");
			goto init_err_cleanup_exit;
		}
		if (sp_docommand(S_CMD_S_BUSTYPE, 1, &bt, 0, NULL))
			goto init_err_cleanup_exit;
		/* Success of any of these commands is optional. We don't need
		   the programmer to tell us its limits, but if it doesn't, we
		   will assume stuff, so it's in the programmers best interest
		   to tell us. */
		if (!sp_docommand(S_CMD_Q_WRNMAXLEN, 0, NULL, 3, rbuf)) {
			uint32_t v;
			v = ((unsigned int)(rbuf[0]) << 0);
			v |= ((unsigned int)(rbuf[1]) << 8);
			v |= ((unsigned int)(rbuf[2]) << 16);
			if (v == 0)
				v = (1 << 24) - 1; /* SPI-op maximum. */
			spi_master_serprog.max_data_write = v;
			msg_pdbg(MSGHEADER "Maximum write-n length is %d\n", v);
		}
		if (!sp_docommand(S_CMD_Q_RDNMAXLEN, 0, NULL, 3, rbuf)) {
			uint32_t v;
			v = ((unsigned int)(rbuf[0]) << 0);
			v |= ((unsigned int)(rbuf[1]) << 8);
			v |= ((unsigned int)(rbuf[2]) << 16);
			if (v == 0)
				v = (1 << 24) - 1; /* SPI-op maximum. */
			spi_master_serprog.max_data_read = v;
			msg_pdbg(MSGHEADER "Maximum read-n length is %d\n", v);
		}
		spispeed = extract_programmer_param("spispeed");
		if (spispeed && strlen(spispeed)) {
			uint32_t f_spi_req, f_spi;
			uint8_t buf[4];
			char *f_spi_suffix;

			errno = 0;
			f_spi_req = strtol(spispeed, &f_spi_suffix, 0);
			if (errno != 0 || spispeed == f_spi_suffix) {
				msg_perr("Error: Could not convert 'spispeed'.\n");
				free(spispeed);
				goto init_err_cleanup_exit;
			}
			if (strlen(f_spi_suffix) == 1) {
				if (!strcasecmp(f_spi_suffix, "M")) {
					f_spi_req *= 1000000;
				} else if (!strcasecmp(f_spi_suffix, "k")) {
					f_spi_req *= 1000;
				} else {
					msg_perr("Error: Garbage following 'spispeed' value.\n");
					free(spispeed);
					goto init_err_cleanup_exit;
				}
			} else if (strlen(f_spi_suffix) > 1) {
				msg_perr("Error: Garbage following 'spispeed' value.\n");
				free(spispeed);
				goto init_err_cleanup_exit;
			}

			buf[0] = (f_spi_req >> (0 * 8)) & 0xFF;
			buf[1] = (f_spi_req >> (1 * 8)) & 0xFF;
			buf[2] = (f_spi_req >> (2 * 8)) & 0xFF;
			buf[3] = (f_spi_req >> (3 * 8)) & 0xFF;

			if (sp_check_commandavail(S_CMD_S_SPI_FREQ) == 0) {
				msg_pwarn(MSGHEADER "Warning: Setting the SPI clock rate is not supported!\n");
			} else if (sp_docommand(S_CMD_S_SPI_FREQ, 4, buf, 4, buf) == 0) {
				f_spi = buf[0];
				f_spi |= buf[1] << (1 * 8);
				f_spi |= buf[2] << (2 * 8);
				f_spi |= buf[3] << (3 * 8);
				msg_pdbg(MSGHEADER "Requested to set SPI clock frequency to %u Hz. "
					 "It was actually set to %u Hz\n", f_spi_req, f_spi);
			} else {
				msg_pwarn(MSGHEADER "Setting SPI clock rate to %u Hz failed!\n", f_spi_req);
			}
		}
		free(spispeed);
		bt = serprog_buses_supported;
		if (sp_docommand(S_CMD_S_BUSTYPE, 1, &bt, 0, NULL))
			goto init_err_cleanup_exit;
	}

	if (serprog_buses_supported & BUS_NONSPI) {
		if (sp_check_commandavail(S_CMD_O_INIT) == 0) {
			msg_perr("Error: Initialize operation buffer "
				 "not supported\n");
			goto init_err_cleanup_exit;
		}

		if (sp_check_commandavail(S_CMD_O_DELAY) == 0) {
			msg_perr("Error: Write to opbuf: "
				 "delay not supported\n");
			goto init_err_cleanup_exit;
		}

		/* S_CMD_O_EXEC availability checked later. */

		if (sp_check_commandavail(S_CMD_R_BYTE) == 0) {
			msg_perr("Error: Single byte read not supported\n");
			goto init_err_cleanup_exit;
		}
		/* This could be translated to single byte reads (if missing),
		 * but now we don't support that. */
		if (sp_check_commandavail(S_CMD_R_NBYTES) == 0) {
			msg_perr("Error: Read n bytes not supported\n");
			goto init_err_cleanup_exit;
		}
		if (sp_check_commandavail(S_CMD_O_WRITEB) == 0) {
			msg_perr("Error: Write to opbuf: "
				 "write byte not supported\n");
			goto init_err_cleanup_exit;
		}

		if (sp_docommand(S_CMD_Q_WRNMAXLEN, 0, NULL, 3, rbuf)) {
			msg_pdbg(MSGHEADER "Write-n not supported");
			sp_max_write_n = 0;
		} else {
			sp_max_write_n = ((unsigned int)(rbuf[0]) << 0);
			sp_max_write_n |= ((unsigned int)(rbuf[1]) << 8);
			sp_max_write_n |= ((unsigned int)(rbuf[2]) << 16);
			if (!sp_max_write_n) {
				sp_max_write_n = (1 << 24);
			}
			msg_pdbg(MSGHEADER "Maximum write-n length is %d\n",
				 sp_max_write_n);
			sp_write_n_buf = malloc(sp_max_write_n);
			if (!sp_write_n_buf) {
				msg_perr("Error: cannot allocate memory for "
					 "Write-n buffer\n");
				goto init_err_cleanup_exit;
			}
			sp_write_n_bytes = 0;
		}

		if (sp_check_commandavail(S_CMD_Q_RDNMAXLEN) &&
		    (sp_docommand(S_CMD_Q_RDNMAXLEN, 0, NULL, 3, rbuf) == 0)) {
			sp_max_read_n = ((unsigned int)(rbuf[0]) << 0);
			sp_max_read_n |= ((unsigned int)(rbuf[1]) << 8);
			sp_max_read_n |= ((unsigned int)(rbuf[2]) << 16);
			msg_pdbg(MSGHEADER "Maximum read-n length is %d\n",
				 sp_max_read_n ? sp_max_read_n : (1 << 24));
		} else {
			msg_pdbg(MSGHEADER "Maximum read-n length "
				 "not reported\n");
			sp_max_read_n = 0;
		}

	}

	if (sp_docommand(S_CMD_Q_PGMNAME, 0, NULL, 16, pgmname)) {
		msg_pwarn("Warning: NAK to query programmer name\n");
		strcpy((char *)pgmname, "(unknown)");
	}
	pgmname[16] = 0;
	msg_pinfo(MSGHEADER "Programmer name is \"%s\"\n", pgmname);

	if (sp_docommand(S_CMD_Q_SERBUF, 0, NULL, 2, &sp_device_serbuf_size)) {
		msg_pwarn("Warning: NAK to query serial buffer size\n");
	}
	msg_pdbg(MSGHEADER "Serial buffer size is %d\n",
		     sp_device_serbuf_size);

	if (sp_check_commandavail(S_CMD_O_INIT)) {
		/* This would be inconsistent. */
		if (sp_check_commandavail(S_CMD_O_EXEC) == 0) {
			msg_perr("Error: Execute operation buffer not "
				 "supported\n");
			goto init_err_cleanup_exit;
		}

		if (sp_docommand(S_CMD_O_INIT, 0, NULL, 0, NULL)) {
			msg_perr("Error: NAK to initialize operation buffer\n");
			goto init_err_cleanup_exit;
		}

		if (sp_docommand(S_CMD_Q_OPBUF, 0, NULL, 2,
		    &sp_device_opbuf_size)) {
			msg_pwarn("Warning: NAK to query operation buffer size\n");
		}
		msg_pdbg(MSGHEADER "operation buffer size is %d\n",
			 sp_device_opbuf_size);
	}

	if (sp_check_commandavail(S_CMD_S_PIN_STATE)) {
		uint8_t en = 1;
		if (sp_docommand(S_CMD_S_PIN_STATE, 1, &en, 0, NULL) != 0) {
			msg_perr("Error: could not enable output buffers\n");
			goto init_err_cleanup_exit;
		} else {
			msg_pdbg(MSGHEADER "Output drivers enabled\n");
		}
	} else {
		msg_pdbg(MSGHEADER "Warning: Programmer does not support toggling its output drivers\n");
	}

	sp_prev_was_write = 0;
	sp_streamed_transmit_ops = 0;
	sp_streamed_transmit_bytes = 0;
	sp_opbuf_usage = 0;

	if (register_shutdown(serprog_shutdown, NULL))
		goto init_err_cleanup_exit;
	if (serprog_buses_supported & BUS_SPI)
		register_spi_master(&spi_master_serprog, NULL);
	if (serprog_buses_supported & BUS_NONSPI)
		register_par_master(&par_master_serprog, serprog_buses_supported & BUS_NONSPI, NULL);
	return 0;

init_err_cleanup_exit:
	serprog_shutdown(NULL);
	return 1;
}

static void serprog_delay(unsigned int usecs)
{
	unsigned char buf[4];
	msg_pspew("%s usecs=%d\n", __func__, usecs);
	if (!sp_check_commandavail(S_CMD_O_DELAY)) {
		msg_pdbg2("serprog_delay used, but programmer doesn't support delays natively - emulating\n");
		internal_delay(usecs);
		return;
	}
	if ((sp_max_write_n) && (sp_write_n_bytes))
		sp_pass_writen();
	sp_check_opbuf_usage(5);
	buf[0] = ((usecs >> 0) & 0xFF);
	buf[1] = ((usecs >> 8) & 0xFF);
	buf[2] = ((usecs >> 16) & 0xFF);
	buf[3] = ((usecs >> 24) & 0xFF);
	sp_stream_buffer_op(S_CMD_O_DELAY, 4, buf);
	sp_opbuf_usage += 5;
	sp_prev_was_write = 0;
}

static void *serprog_map(const char *descr, uintptr_t phys_addr, size_t len)
{
	/* Serprog transmits 24 bits only and assumes the underlying implementation handles any remaining bits
	 * correctly (usually setting them to one either in software (for FWH/LPC) or relying on the fact that
	 * the hardware observes a subset of the address bits only). Combined with the standard mapping of
	 * flashrom this creates a 16 MB-wide window just below the 4 GB boundary where serprog can operate (as
	 * needed for non-SPI chips). Below we make sure that the requested range is within this window. */
	if ((phys_addr & 0xFF000000) == 0xFF000000) {
		return (void*)phys_addr;
	}
	msg_pwarn(MSGHEADER "requested mapping %s is incompatible: 0x%zx bytes at 0x%0*" PRIxPTR ".\n",
		  descr, len, PRIxPTR_WIDTH, phys_addr);
	return NULL;
}

const struct programmer_entry programmer_serprog = {
	.name			= "serprog",
	.type			= OTHER,
				/* FIXME */
	.devs.note		= "All programmer devices speaking the serprog protocol\n",
	.init			= serprog_init,
	.map_flash_region	= serprog_map,
	.unmap_flash_region	= fallback_unmap,
	.delay			= serprog_delay,
};