summaryrefslogtreecommitdiffstats
path: root/serprog.c
blob: 9d554c9eb1ae4007d8e611cb1dd6e55a50d6ccd0 (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
/*
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netdb.h>
#include <sys/stat.h>
#include <errno.h>
#include <inttypes.h>
#include <termios.h>
#include "flash.h"
#include "programmer.h"
#include "chipdrivers.h"

#define MSGHEADER "serprog:"

/*
 * FIXME: This prototype was added to help reduce diffs for the shutdown
 * registration patch, which shifted many lines of code to place
 * serprog_shutdown() before serprog_init(). It should be removed soon.
 */
static int serprog_shutdown(void *data);

#define S_ACK 0x06
#define S_NAK 0x15
#define S_CMD_NOP		0x00	/* No operation                                 */
#define S_CMD_Q_IFACE		0x01	/* Query interface version                      */
#define S_CMD_Q_CMDMAP		0x02	/* Query supported commands bitmap              */
#define S_CMD_Q_PGMNAME		0x03	/* Query programmer name                        */
#define S_CMD_Q_SERBUF		0x04	/* Query Serial Buffer Size                     */
#define S_CMD_Q_BUSTYPE		0x05	/* Query supported bustypes                     */
#define S_CMD_Q_CHIPSIZE	0x06	/* Query supported chipsize (2^n format)        */
#define S_CMD_Q_OPBUF		0x07	/* Query operation buffer size                  */
#define S_CMD_Q_WRNMAXLEN	0x08	/* Query opbuf-write-N maximum length           */
#define S_CMD_R_BYTE		0x09	/* Read a single byte                           */
#define S_CMD_R_NBYTES		0x0A	/* Read n bytes                                 */
#define S_CMD_O_INIT		0x0B	/* Initialize operation buffer                  */
#define S_CMD_O_WRITEB		0x0C	/* Write opbuf: Write byte with address         */
#define S_CMD_O_WRITEN		0x0D	/* Write to opbuf: Write-N                      */
#define S_CMD_O_DELAY		0x0E	/* Write opbuf: udelay                          */
#define S_CMD_O_EXEC		0x0F	/* Execute operation buffer                     */
#define S_CMD_SYNCNOP		0x10	/* Special no-operation that returns NAK+ACK    */
#define S_CMD_Q_RDNMAXLEN	0x11	/* Query read-n maximum length			*/
#define S_CMD_S_BUSTYPE		0x12	/* Set used bustype(s).				*/
#define S_CMD_O_SPIOP		0x13	/* Perform SPI operation.			*/

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 int sp_streamed_transmit_ops = 0;
static 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;

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)
		sp_die("Error: serprog cannot open socket");
	hostPtr = gethostbyname(ip);
	if (NULL == hostPtr) {
		hostPtr = gethostbyaddr(ip, strlen(ip), AF_INET);
		if (NULL == hostPtr)
			sp_die("Error: cannot resolve");
	}
	sp.si.sin_family = AF_INET;
	sp.si.sin_port = htons(port);
	(void)memcpy(&sp.si.sin_addr, hostPtr->h_addr, hostPtr->h_length);
	if (connect(sock, &sp.s, sizeof(sp.si)) < 0) {
		close(sock);
		sp_die("Error: serprog cannot connect");
	}
	/* We are latency limited, and sometimes do write-write-read    *
	 * (write-n) - so enable TCP_NODELAY.				*/
	setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, &flag, sizeof(int));
	return sock;
}

static int sp_sync_read_timeout(int loops)
{
	int i;
	unsigned char c;
	for (i = 0; i < loops; i++) {
		ssize_t rv;
		rv = read(sp_fd, &c, 1);
		if (rv == 1)
			return c;
		if ((rv == -1) && (errno != EAGAIN))
			sp_die("read");
		usleep(10 * 1000);	/* 10ms units */
	}
	return -1;
}

/* 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 read - 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 void sp_synchronize(void)
{
	int i;
	int flags = fcntl(sp_fd, F_GETFL);
	unsigned char buf[8];
	flags |= O_NONBLOCK;
	fcntl(sp_fd, F_SETFL, flags);
	/* 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 (write(sp_fd, buf, 8) != 8)
		sp_die("flush write");
	/* A second should be enough to get all the answers to the buffer */
	usleep(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 (write(sp_fd, &c, 1) != 1)
			sp_die("sync write");
		msg_pdbg(".");
		fflush(stdout);
		for (n = 0; n < 10; n++) {
			c = sp_sync_read_timeout(5);	/* wait up to 50ms */
			if (c != S_NAK)
				continue;
			c = sp_sync_read_timeout(2);
			if (c != S_ACK)
				continue;
			c = S_CMD_SYNCNOP;
			if (write(sp_fd, &c, 1) != 1)
				sp_die("sync write");
			c = sp_sync_read_timeout(50);
			if (c != S_NAK)
				break;	/* fail */
			c = sp_sync_read_timeout(10);
			if (c != S_ACK)
				break;	/* fail */
			/* Ok, synchronized; back to blocking reads and return. */
			flags &= ~O_NONBLOCK;
			fcntl(sp_fd, F_SETFL, flags);
			msg_pdbg("\n");
			return;
		}
	}
	msg_perr("Error: cannot synchronize protocol\n"
		"- check communications and reset device?\n");
	exit(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 %d - wont 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 *sendpacket;
	unsigned char c;
	if (sp_automatic_cmdcheck(command))
		return 1;
	sendpacket = malloc(1 + parmlen);
	if (!sendpacket)
		sp_die("Error: cannot malloc command buffer");
	sendpacket[0] = command;
	memcpy(&(sendpacket[1]), params, parmlen);
	if (write(sp_fd, sendpacket, 1 + parmlen) != (1 + parmlen)) {
		sp_die("Error: cannot write command");
	}
	free(sendpacket);
	if (read(sp_fd, &c, 1) != 1)
		sp_die("Error: cannot read from device");
	if (c == S_NAK) return 1;
	if (c != S_ACK) {
		msg_perr("Error: invalid response 0x%02X from device\n",c);
		exit(1);
	}
	if (retlen) {
		int rd_bytes = 0;
		do {
			int r;
			r = read(sp_fd, retparms + rd_bytes,
				 retlen - rd_bytes);
			if (r <= 0) sp_die
				    ("Error: cannot read return parameters");
			rd_bytes += r;
		} while (rd_bytes != retlen);
	}
	return 0;
}

static void sp_flush_stream(void)
{
	if (sp_streamed_transmit_ops)
		do {
			unsigned char c;
			if (read(sp_fd, &c, 1) != 1) {
				sp_die("Error: cannot read from device (flushing stream)");
			}
			if (c == S_NAK) {
				msg_perr("Error: NAK to a stream buffer operation\n");
				exit(1);
			}
			if (c != S_ACK) {
				msg_perr("Error: Invalid reply 0x%02X from device\n", c);
				exit(1);
			}
		} while (--sp_streamed_transmit_ops);
	sp_streamed_transmit_ops = 0;
	sp_streamed_transmit_bytes = 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) sp_die("Error: cannot malloc command buffer");
	sp[0] = cmd;
	memcpy(&(sp[1]), parms, parmlen);
	if (sp_streamed_transmit_bytes >= (1 + parmlen + sp_device_serbuf_size))
		sp_flush_stream();
	if (write(sp_fd, sp, 1 + parmlen) != (1 + parmlen))
		sp_die("Error: cannot write command");
	free(sp);
	sp_streamed_transmit_ops += 1;
	sp_streamed_transmit_bytes += 1 + parmlen;
	return 0;
}

static struct spi_programmer spi_programmer_serprog = {
	.type		= SPI_CONTROLLER_SERPROG,
	.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		= serprog_spi_read,
	.write_256	= default_spi_write_256,
};

int serprog_init(void)
{
	uint16_t iface;
	unsigned char pgmname[17];
	unsigned char rbuf[3];
	unsigned char c;
	char *device;
	char *baudport;
	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)) {
		baudport = strstr(device, ":");
		if (baudport) {
			/* Split device from baudrate. */
			*baudport = '\0';
			baudport++;
		}
		if (!baudport || !strlen(baudport)) {
			msg_perr("Error: No baudrate specified.\n"
				 "Use flashrom -p serprog:dev=/dev/device:baud\n");
			free(device);
			return 1;
		}
		if (strlen(device)) {
			sp_fd = sp_openserport(device, atoi(baudport));
			have_device++;
		}
	}
	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)) {
		baudport = strstr(device, ":");
		if (baudport) {
			/* Split host from port. */
			*baudport = '\0';
			baudport++;
		}
		if (!baudport || !strlen(baudport)) {
			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(baudport));
			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;
	}
	free(device);

	if (!have_device) {
		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");
		return 1;
	}

	if (register_shutdown(serprog_shutdown, NULL))
		return 1;

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

	sp_check_avail_automatic = 0;

	sp_synchronize();

	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");
		exit(1);
	}

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

	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");
		exit(1);
	}

	sp_check_avail_automatic = 1;


	if (sp_docommand(S_CMD_Q_BUSTYPE, 0, NULL, 1, &c)) {
		msg_perr("Warning: NAK to query supported buses\n");
		c = BUS_NONSPI;	/* A reasonable default for now. */
	}
	buses_supported = c;
	/* Check for the minimum operational set of commands. */
	if (buses_supported & BUS_SPI) {
		uint8_t bt = BUS_SPI;
		if (sp_check_commandavail(S_CMD_O_SPIOP) == 0) {
			msg_perr("Error: SPI operation not supported while the "
				 "bustype is SPI\n");
			exit(1);
		}
		/* 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. */
		sp_docommand(S_CMD_S_BUSTYPE, 1, &bt, 0, NULL);
		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_programmer_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_programmer_serprog.max_data_read = v;
			msg_pdbg(MSGHEADER "Maximum read-n length is %d\n", v);
		}
		bt = buses_supported;
		sp_docommand(S_CMD_S_BUSTYPE, 1, &bt, 0, NULL);
		register_spi_programmer(&spi_programmer_serprog);
	}

	if (buses_supported & BUS_NONSPI) {
		if (sp_check_commandavail(S_CMD_O_INIT) == 0) {
			msg_perr("Error: Initialize operation buffer "
				 "not supported\n");
			exit(1);
		}

		if (sp_check_commandavail(S_CMD_O_DELAY) == 0) {
			msg_perr("Error: Write to opbuf: "
				 "delay not supported\n");
			exit(1);
		}

		/* 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");
			exit(1);
		}
		/* 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");
			exit(1);
		}
		if (sp_check_commandavail(S_CMD_O_WRITEB) == 0) {
			msg_perr("Error: Write to opbuf: "
				 "write byte not supported\n");
			exit(1);
		}

		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");
				exit(1);
			}
			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_perr("Warning: NAK to query programmer name\n");
		strcpy((char *)pgmname, "(unknown)");
	}
	pgmname[16] = 0;
	msg_pinfo(MSGHEADER "Programmer name \"%s\"\n", pgmname);

	if (sp_docommand(S_CMD_Q_SERBUF, 0, NULL, 2, &sp_device_serbuf_size)) {
		msg_perr("Warning: NAK to query serial buffer size\n");
	}
	msg_pdbg(MSGHEADER "serial buffer size %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");
			exit(1);
		}

		if (sp_docommand(S_CMD_O_INIT, 0, NULL, 0, NULL)) {
			msg_perr("Error: NAK to initialize operation buffer\n");
			exit(1);
		}

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

	sp_prev_was_write = 0;
	sp_streamed_transmit_ops = 0;
	sp_streamed_transmit_bytes = 0;
	sp_opbuf_usage = 0;
	return 0;
}

/* Move an in flashrom buffer existing write-n operation to	*
 * the on-device operation buffer.				*/
static void 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))
		sp_flush_stream();
	/* 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];
		sp_stream_buffer_op(S_CMD_O_WRITEB, 4, header);
		sp_opbuf_usage += 5;
		return;
	}
	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 (write(sp_fd, header, 7) != 7)
		sp_die("Error: cannot write write-n command\n");
	if (write(sp_fd, sp_write_n_buf, sp_write_n_bytes) !=
	    sp_write_n_bytes)
		sp_die("Error: cannot write write-n data");
	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;
}

static void sp_execute_opbuf_noflush(void)
{
	if ((sp_max_write_n) && (sp_write_n_bytes))
		sp_pass_writen();
	sp_stream_buffer_op(S_CMD_O_EXEC, 0, NULL);
	msg_pspew(MSGHEADER "Executed operation buffer of %d bytes\n",
		     sp_opbuf_usage);
	sp_opbuf_usage = 0;
	sp_prev_was_write = 0;
	return;
}

static void sp_execute_opbuf(void)
{
	sp_execute_opbuf_noflush();
	sp_flush_stream();
}

static int serprog_shutdown(void *data)
{
	msg_pspew("%s\n", __func__);
	if ((sp_opbuf_usage) || (sp_max_write_n && sp_write_n_bytes))
		sp_execute_opbuf();
	close(sp_fd);
	if (sp_max_write_n)
		free(sp_write_n_buf);
	return 0;
}

static void sp_check_opbuf_usage(int bytes_to_be_added)
{
	if (sp_device_opbuf_size <= (sp_opbuf_usage + bytes_to_be_added)) {
		sp_execute_opbuf();
		/* If this happens in the mid of an page load the page load *
		 * will probably fail.					    */
		msg_pdbg(MSGHEADER "Warning: executed operation buffer due to size reasons\n");
	}
}

void serprog_chip_writeb(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);
		sp_opbuf_usage += 5;
	}
}

uint8_t serprog_chip_readb(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);
	sp_flush_stream();
	if (read(sp_fd, &c, 1) != 1)
		sp_die("readb byteread");
	msg_pspew("%s addr=0x%lx returning 0x%02X\n", __func__, addr, c);
	return c;
}

/* Local version that really does the job, doesn't care of max_read_n. */
static void sp_do_read_n(uint8_t * buf, const chipaddr addr, size_t len)
{
	int rd_bytes = 0;
	unsigned char sbuf[6];
	msg_pspew("%s: addr=0x%lx len=%lu\n", __func__, addr, (unsigned long)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);
	sp_flush_stream();
	do {
		int r = read(sp_fd, buf + rd_bytes, len - rd_bytes);
		if (r <= 0)
			sp_die("Error: cannot read read-n data");
		rd_bytes += r;
	} while (rd_bytes != len);
	return;
}

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

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

int serprog_spi_send_command(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))
		sp_execute_opbuf();
	parmbuf = malloc(writecnt + 6);
	if (!parmbuf)
		sp_die("Error: cannot malloc SPI send param buffer");
	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;
}

/* FIXME: This function is optimized so that it does not split each transaction
 * into chip page_size long blocks unnecessarily like spi_read_chunked. This has
 * the advantage that it is much faster for most chips, but breaks those with
 * non-contiguous address space (like AT45DB161D). When spi_read_chunked is
 * fixed this method can be removed. */
int serprog_spi_read(struct flashchip *flash, uint8_t *buf, int start, int len)
{
	int i;
	int cur_len;
	const int max_read = spi_programmer_serprog.max_data_read;
	for (i = 0; i < len; i += cur_len) {
		int ret;
		cur_len = min(max_read, (len - i));
		ret = spi_nbyte_read(start + i, buf + i, cur_len);
		if (ret)
			return ret;
	}
	return 0;
}
OpenPOWER on IntegriCloud