docg3.c 57.3 KB
Newer Older
R
Robert Jarzmik 已提交
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
/*
 * Handles the M-Systems DiskOnChip G3 chip
 *
 * Copyright (C) 2011 Robert Jarzmik
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
32 33 34
#include <linux/bitmap.h>
#include <linux/bitrev.h>
#include <linux/bch.h>
R
Robert Jarzmik 已提交
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

#include <linux/debugfs.h>
#include <linux/seq_file.h>

#define CREATE_TRACE_POINTS
#include "docg3.h"

/*
 * This driver handles the DiskOnChip G3 flash memory.
 *
 * As no specification is available from M-Systems/Sandisk, this drivers lacks
 * several functions available on the chip, as :
 *  - IPL write
 *
 * The bus data width (8bits versus 16bits) is not handled (if_cfg flag), and
 * the driver assumes a 16bits data bus.
 *
 * DocG3 relies on 2 ECC algorithms, which are handled in hardware :
 *  - a 1 byte Hamming code stored in the OOB for each page
 *  - a 7 bytes BCH code stored in the OOB for each page
55
 * The BCH ECC is :
R
Robert Jarzmik 已提交
56 57 58 59 60 61 62 63
 *  - BCH is in GF(2^14)
 *  - BCH is over data of 520 bytes (512 page + 7 page_info bytes
 *                                   + 1 hamming byte)
 *  - BCH can correct up to 4 bits (t = 4)
 *  - BCH syndroms are calculated in hardware, and checked in hardware as well
 *
 */

R
Robert Jarzmik 已提交
64 65 66 67 68
static unsigned int reliable_mode = 0;
module_param(reliable_mode, uint, 0);
MODULE_PARM_DESC(reliable_mode, "Set the docg3 mode (0=normal MLC, 1=fast, "
		 "2=reliable) : MLC normal operations are in normal mode");

69 70 71 72 73 74 75 76 77 78 79 80 81 82
/**
 * struct docg3_oobinfo - DiskOnChip G3 OOB layout
 * @eccbytes: 8 bytes are used (1 for Hamming ECC, 7 for BCH ECC)
 * @eccpos: ecc positions (byte 7 is Hamming ECC, byte 8-14 are BCH ECC)
 * @oobfree: free pageinfo bytes (byte 0 until byte 6, byte 15
 * @oobavail: 8 available bytes remaining after ECC toll
 */
static struct nand_ecclayout docg3_oobinfo = {
	.eccbytes = 8,
	.eccpos = {7, 8, 9, 10, 11, 12, 13, 14},
	.oobfree = {{0, 7}, {15, 1} },
	.oobavail = 8,
};

83 84 85 86 87
/**
 * struct docg3_bch - BCH engine
 */
static struct bch_control *docg3_bch;

R
Robert Jarzmik 已提交
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106
static inline u8 doc_readb(struct docg3 *docg3, u16 reg)
{
	u8 val = readb(docg3->base + reg);

	trace_docg3_io(0, 8, reg, (int)val);
	return val;
}

static inline u16 doc_readw(struct docg3 *docg3, u16 reg)
{
	u16 val = readw(docg3->base + reg);

	trace_docg3_io(0, 16, reg, (int)val);
	return val;
}

static inline void doc_writeb(struct docg3 *docg3, u8 val, u16 reg)
{
	writeb(val, docg3->base + reg);
107
	trace_docg3_io(1, 8, reg, val);
R
Robert Jarzmik 已提交
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
}

static inline void doc_writew(struct docg3 *docg3, u16 val, u16 reg)
{
	writew(val, docg3->base + reg);
	trace_docg3_io(1, 16, reg, val);
}

static inline void doc_flash_command(struct docg3 *docg3, u8 cmd)
{
	doc_writeb(docg3, cmd, DOC_FLASHCOMMAND);
}

static inline void doc_flash_sequence(struct docg3 *docg3, u8 seq)
{
	doc_writeb(docg3, seq, DOC_FLASHSEQUENCE);
}

static inline void doc_flash_address(struct docg3 *docg3, u8 addr)
{
	doc_writeb(docg3, addr, DOC_FLASHADDRESS);
}

static char const *part_probes[] = { "cmdlinepart", "saftlpart", NULL };

static int doc_register_readb(struct docg3 *docg3, int reg)
{
	u8 val;

	doc_writew(docg3, reg, DOC_READADDRESS);
	val = doc_readb(docg3, reg);
	doc_vdbg("Read register %04x : %02x\n", reg, val);
	return val;
}

static int doc_register_readw(struct docg3 *docg3, int reg)
{
	u16 val;

	doc_writew(docg3, reg, DOC_READADDRESS);
	val = doc_readw(docg3, reg);
	doc_vdbg("Read register %04x : %04x\n", reg, val);
	return val;
}

/**
 * doc_delay - delay docg3 operations
 * @docg3: the device
 * @nbNOPs: the number of NOPs to issue
 *
 * As no specification is available, the right timings between chip commands are
 * unknown. The only available piece of information are the observed nops on a
 * working docg3 chip.
 * Therefore, doc_delay relies on a busy loop of NOPs, instead of scheduler
 * friendlier msleep() functions or blocking mdelay().
 */
static void doc_delay(struct docg3 *docg3, int nbNOPs)
{
	int i;

168
	doc_vdbg("NOP x %d\n", nbNOPs);
R
Robert Jarzmik 已提交
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
	for (i = 0; i < nbNOPs; i++)
		doc_writeb(docg3, 0, DOC_NOP);
}

static int is_prot_seq_error(struct docg3 *docg3)
{
	int ctrl;

	ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
	return ctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR);
}

static int doc_is_ready(struct docg3 *docg3)
{
	int ctrl;

	ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
	return ctrl & DOC_CTRL_FLASHREADY;
}

static int doc_wait_ready(struct docg3 *docg3)
{
	int maxWaitCycles = 100;

	do {
		doc_delay(docg3, 4);
		cpu_relax();
	} while (!doc_is_ready(docg3) && maxWaitCycles--);
	doc_delay(docg3, 2);
	if (maxWaitCycles > 0)
		return 0;
	else
		return -EIO;
}

static int doc_reset_seq(struct docg3 *docg3)
{
	int ret;

	doc_writeb(docg3, 0x10, DOC_FLASHCONTROL);
	doc_flash_sequence(docg3, DOC_SEQ_RESET);
	doc_flash_command(docg3, DOC_CMD_RESET);
	doc_delay(docg3, 2);
	ret = doc_wait_ready(docg3);

	doc_dbg("doc_reset_seq() -> isReady=%s\n", ret ? "false" : "true");
	return ret;
}

/**
 * doc_read_data_area - Read data from data area
 * @docg3: the device
221 222
 * @buf: the buffer to fill in (might be NULL is dummy reads)
 * @len: the length to read
R
Robert Jarzmik 已提交
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
 * @first: first time read, DOC_READADDRESS should be set
 *
 * Reads bytes from flash data. Handles the single byte / even bytes reads.
 */
static void doc_read_data_area(struct docg3 *docg3, void *buf, int len,
			       int first)
{
	int i, cdr, len4;
	u16 data16, *dst16;
	u8 data8, *dst8;

	doc_dbg("doc_read_data_area(buf=%p, len=%d)\n", buf, len);
	cdr = len & 0x3;
	len4 = len - cdr;

	if (first)
		doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
	dst16 = buf;
	for (i = 0; i < len4; i += 2) {
		data16 = doc_readw(docg3, DOC_IOSPACE_DATA);
243 244 245 246
		if (dst16) {
			*dst16 = data16;
			dst16++;
		}
R
Robert Jarzmik 已提交
247 248 249 250 251 252 253 254 255
	}

	if (cdr) {
		doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
			   DOC_READADDRESS);
		doc_delay(docg3, 1);
		dst8 = (u8 *)dst16;
		for (i = 0; i < cdr; i++) {
			data8 = doc_readb(docg3, DOC_IOSPACE_DATA);
256 257 258 259
			if (dst8) {
				*dst8 = data8;
				dst8++;
			}
R
Robert Jarzmik 已提交
260 261 262 263
		}
	}
}

R
Robert Jarzmik 已提交
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
/**
 * doc_write_data_area - Write data into data area
 * @docg3: the device
 * @buf: the buffer to get input bytes from
 * @len: the length to write
 *
 * Writes bytes into flash data. Handles the single byte / even bytes writes.
 */
static void doc_write_data_area(struct docg3 *docg3, const void *buf, int len)
{
	int i, cdr, len4;
	u16 *src16;
	u8 *src8;

	doc_dbg("doc_write_data_area(buf=%p, len=%d)\n", buf, len);
	cdr = len & 0x3;
	len4 = len - cdr;

	doc_writew(docg3, DOC_IOSPACE_DATA, DOC_READADDRESS);
	src16 = (u16 *)buf;
	for (i = 0; i < len4; i += 2) {
		doc_writew(docg3, *src16, DOC_IOSPACE_DATA);
		src16++;
	}

	src8 = (u8 *)src16;
	for (i = 0; i < cdr; i++) {
		doc_writew(docg3, DOC_IOSPACE_DATA | DOC_READADDR_ONE_BYTE,
			   DOC_READADDRESS);
		doc_writeb(docg3, *src8, DOC_IOSPACE_DATA);
		src8++;
	}
}

R
Robert Jarzmik 已提交
298
/**
R
Robert Jarzmik 已提交
299
 * doc_set_data_mode - Sets the flash to normal or reliable data mode
R
Robert Jarzmik 已提交
300 301 302 303 304
 * @docg3: the device
 *
 * The reliable data mode is a bit slower than the fast mode, but less errors
 * occur.  Entering the reliable mode cannot be done without entering the fast
 * mode first.
R
Robert Jarzmik 已提交
305 306 307 308 309 310 311
 *
 * In reliable mode, pages 2*n and 2*n+1 are clones. Writing to page 0 of blocks
 * (4,5) make the hardware write also to page 1 of blocks blocks(4,5). Reading
 * from page 0 of blocks (4,5) or from page 1 of blocks (4,5) gives the same
 * result, which is a logical and between bytes from page 0 and page 1 (which is
 * consistent with the fact that writing to a page is _clearing_ bits of that
 * page).
R
Robert Jarzmik 已提交
312 313 314
 */
static void doc_set_reliable_mode(struct docg3 *docg3)
{
R
Robert Jarzmik 已提交
315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333
	static char *strmode[] = { "normal", "fast", "reliable", "invalid" };

	doc_dbg("doc_set_reliable_mode(%s)\n", strmode[docg3->reliable]);
	switch (docg3->reliable) {
	case 0:
		break;
	case 1:
		doc_flash_sequence(docg3, DOC_SEQ_SET_FASTMODE);
		doc_flash_command(docg3, DOC_CMD_FAST_MODE);
		break;
	case 2:
		doc_flash_sequence(docg3, DOC_SEQ_SET_RELIABLEMODE);
		doc_flash_command(docg3, DOC_CMD_FAST_MODE);
		doc_flash_command(docg3, DOC_CMD_RELIABLE_MODE);
		break;
	default:
		doc_err("doc_set_reliable_mode(): invalid mode\n");
		break;
	}
R
Robert Jarzmik 已提交
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
	doc_delay(docg3, 2);
}

/**
 * doc_set_asic_mode - Set the ASIC mode
 * @docg3: the device
 * @mode: the mode
 *
 * The ASIC can work in 3 modes :
 *  - RESET: all registers are zeroed
 *  - NORMAL: receives and handles commands
 *  - POWERDOWN: minimal poweruse, flash parts shut off
 */
static void doc_set_asic_mode(struct docg3 *docg3, u8 mode)
{
	int i;

	for (i = 0; i < 12; i++)
		doc_readb(docg3, DOC_IOSPACE_IPL);

	mode |= DOC_ASICMODE_MDWREN;
	doc_dbg("doc_set_asic_mode(%02x)\n", mode);
	doc_writeb(docg3, mode, DOC_ASICMODE);
	doc_writeb(docg3, ~mode, DOC_ASICMODECONFIRM);
	doc_delay(docg3, 1);
}

/**
 * doc_set_device_id - Sets the devices id for cascaded G3 chips
 * @docg3: the device
 * @id: the chip to select (amongst 0, 1, 2, 3)
 *
 * There can be 4 cascaded G3 chips. This function selects the one which will
 * should be the active one.
 */
static void doc_set_device_id(struct docg3 *docg3, int id)
{
	u8 ctrl;

	doc_dbg("doc_set_device_id(%d)\n", id);
	doc_writeb(docg3, id, DOC_DEVICESELECT);
	ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);

	ctrl &= ~DOC_CTRL_VIOLATION;
	ctrl |= DOC_CTRL_CE;
	doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);
}

/**
 * doc_set_extra_page_mode - Change flash page layout
 * @docg3: the device
 *
 * Normally, the flash page is split into the data (512 bytes) and the out of
 * band data (16 bytes). For each, 4 more bytes can be accessed, where the wear
 * leveling counters are stored.  To access this last area of 4 bytes, a special
 * mode must be input to the flash ASIC.
 *
 * Returns 0 if no error occured, -EIO else.
 */
static int doc_set_extra_page_mode(struct docg3 *docg3)
{
	int fctrl;

	doc_dbg("doc_set_extra_page_mode()\n");
	doc_flash_sequence(docg3, DOC_SEQ_PAGE_SIZE_532);
	doc_flash_command(docg3, DOC_CMD_PAGE_SIZE_532);
	doc_delay(docg3, 2);

	fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
	if (fctrl & (DOC_CTRL_PROTECTION_ERROR | DOC_CTRL_SEQUENCE_ERROR))
		return -EIO;
	else
		return 0;
}

R
Robert Jarzmik 已提交
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
/**
 * doc_setup_addr_sector - Setup blocks/page/ofs address for one plane
 * @docg3: the device
 * @sector: the sector
 */
static void doc_setup_addr_sector(struct docg3 *docg3, int sector)
{
	doc_delay(docg3, 1);
	doc_flash_address(docg3, sector & 0xff);
	doc_flash_address(docg3, (sector >> 8) & 0xff);
	doc_flash_address(docg3, (sector >> 16) & 0xff);
	doc_delay(docg3, 1);
}

/**
 * doc_setup_writeaddr_sector - Setup blocks/page/ofs address for one plane
 * @docg3: the device
 * @sector: the sector
 * @ofs: the offset in the page, between 0 and (512 + 16 + 512)
 */
static void doc_setup_writeaddr_sector(struct docg3 *docg3, int sector, int ofs)
{
	ofs = ofs >> 2;
	doc_delay(docg3, 1);
	doc_flash_address(docg3, ofs & 0xff);
	doc_flash_address(docg3, sector & 0xff);
	doc_flash_address(docg3, (sector >> 8) & 0xff);
	doc_flash_address(docg3, (sector >> 16) & 0xff);
	doc_delay(docg3, 1);
}

R
Robert Jarzmik 已提交
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
/**
 * doc_seek - Set both flash planes to the specified block, page for reading
 * @docg3: the device
 * @block0: the first plane block index
 * @block1: the second plane block index
 * @page: the page index within the block
 * @wear: if true, read will occur on the 4 extra bytes of the wear area
 * @ofs: offset in page to read
 *
 * Programs the flash even and odd planes to the specific block and page.
 * Alternatively, programs the flash to the wear area of the specified page.
 */
static int doc_read_seek(struct docg3 *docg3, int block0, int block1, int page,
			 int wear, int ofs)
{
	int sector, ret = 0;

	doc_dbg("doc_seek(blocks=(%d,%d), page=%d, ofs=%d, wear=%d)\n",
		block0, block1, page, ofs, wear);

	if (!wear && (ofs < 2 * DOC_LAYOUT_PAGE_SIZE)) {
		doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1);
		doc_flash_command(docg3, DOC_CMD_READ_PLANE1);
		doc_delay(docg3, 2);
	} else {
		doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2);
		doc_flash_command(docg3, DOC_CMD_READ_PLANE2);
		doc_delay(docg3, 2);
	}

	doc_set_reliable_mode(docg3);
	if (wear)
		ret = doc_set_extra_page_mode(docg3);
	if (ret)
		goto out;

	doc_flash_sequence(docg3, DOC_SEQ_READ);
R
Robert Jarzmik 已提交
477
	sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
R
Robert Jarzmik 已提交
478
	doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
R
Robert Jarzmik 已提交
479
	doc_setup_addr_sector(docg3, sector);
R
Robert Jarzmik 已提交
480 481 482

	sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
	doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
R
Robert Jarzmik 已提交
483
	doc_setup_addr_sector(docg3, sector);
R
Robert Jarzmik 已提交
484
	doc_delay(docg3, 1);
R
Robert Jarzmik 已提交
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

out:
	return ret;
}

/**
 * doc_write_seek - Set both flash planes to the specified block, page for writing
 * @docg3: the device
 * @block0: the first plane block index
 * @block1: the second plane block index
 * @page: the page index within the block
 * @ofs: offset in page to write
 *
 * Programs the flash even and odd planes to the specific block and page.
 * Alternatively, programs the flash to the wear area of the specified page.
 */
static int doc_write_seek(struct docg3 *docg3, int block0, int block1, int page,
			 int ofs)
{
	int ret = 0, sector;

	doc_dbg("doc_write_seek(blocks=(%d,%d), page=%d, ofs=%d)\n",
		block0, block1, page, ofs);

	doc_set_reliable_mode(docg3);

	if (ofs < 2 * DOC_LAYOUT_PAGE_SIZE) {
		doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE1);
		doc_flash_command(docg3, DOC_CMD_READ_PLANE1);
		doc_delay(docg3, 2);
	} else {
		doc_flash_sequence(docg3, DOC_SEQ_SET_PLANE2);
		doc_flash_command(docg3, DOC_CMD_READ_PLANE2);
		doc_delay(docg3, 2);
	}

	doc_flash_sequence(docg3, DOC_SEQ_PAGE_SETUP);
	doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);

	sector = (block0 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
	doc_setup_writeaddr_sector(docg3, sector, ofs);

	doc_flash_command(docg3, DOC_CMD_PROG_CYCLE3);
R
Robert Jarzmik 已提交
528
	doc_delay(docg3, 2);
R
Robert Jarzmik 已提交
529 530 531 532 533 534 535 536
	ret = doc_wait_ready(docg3);
	if (ret)
		goto out;

	doc_flash_command(docg3, DOC_CMD_PROG_CYCLE1);
	sector = (block1 << DOC_ADDR_BLOCK_SHIFT) + (page & DOC_ADDR_PAGE_MASK);
	doc_setup_writeaddr_sector(docg3, sector, ofs);
	doc_delay(docg3, 1);
R
Robert Jarzmik 已提交
537 538 539 540 541

out:
	return ret;
}

R
Robert Jarzmik 已提交
542

R
Robert Jarzmik 已提交
543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
/**
 * doc_read_page_ecc_init - Initialize hardware ECC engine
 * @docg3: the device
 * @len: the number of bytes covered by the ECC (BCH covered)
 *
 * The function does initialize the hardware ECC engine to compute the Hamming
 * ECC (on 1 byte) and the BCH Syndroms (on 7 bytes).
 *
 * Return 0 if succeeded, -EIO on error
 */
static int doc_read_page_ecc_init(struct docg3 *docg3, int len)
{
	doc_writew(docg3, DOC_ECCCONF0_READ_MODE
		   | DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
		   | (len & DOC_ECCCONF0_DATA_BYTES_MASK),
		   DOC_ECCCONF0);
	doc_delay(docg3, 4);
	doc_register_readb(docg3, DOC_FLASHCONTROL);
	return doc_wait_ready(docg3);
}

R
Robert Jarzmik 已提交
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
/**
 * doc_write_page_ecc_init - Initialize hardware BCH ECC engine
 * @docg3: the device
 * @len: the number of bytes covered by the ECC (BCH covered)
 *
 * The function does initialize the hardware ECC engine to compute the Hamming
 * ECC (on 1 byte) and the BCH Syndroms (on 7 bytes).
 *
 * Return 0 if succeeded, -EIO on error
 */
static int doc_write_page_ecc_init(struct docg3 *docg3, int len)
{
	doc_writew(docg3, !DOC_ECCCONF0_READ_MODE
		   | DOC_ECCCONF0_BCH_ENABLE | DOC_ECCCONF0_HAMMING_ENABLE
		   | (len & DOC_ECCCONF0_DATA_BYTES_MASK),
		   DOC_ECCCONF0);
	doc_delay(docg3, 4);
	doc_register_readb(docg3, DOC_FLASHCONTROL);
	return doc_wait_ready(docg3);
}

/**
 * doc_ecc_disable - Disable Hamming and BCH ECC hardware calculator
 * @docg3: the device
 *
 * Disables the hardware ECC generator and checker, for unchecked reads (as when
 * reading OOB only or write status byte).
 */
static void doc_ecc_disable(struct docg3 *docg3)
{
	doc_writew(docg3, DOC_ECCCONF0_READ_MODE, DOC_ECCCONF0);
	doc_delay(docg3, 4);
}

/**
 * doc_hamming_ecc_init - Initialize hardware Hamming ECC engine
 * @docg3: the device
 * @nb_bytes: the number of bytes covered by the ECC (Hamming covered)
 *
 * This function programs the ECC hardware to compute the hamming code on the
 * last provided N bytes to the hardware generator.
 */
static void doc_hamming_ecc_init(struct docg3 *docg3, int nb_bytes)
{
	u8 ecc_conf1;

	ecc_conf1 = doc_register_readb(docg3, DOC_ECCCONF1);
	ecc_conf1 &= ~DOC_ECCCONF1_HAMMING_BITS_MASK;
	ecc_conf1 |= (nb_bytes & DOC_ECCCONF1_HAMMING_BITS_MASK);
	doc_writeb(docg3, ecc_conf1, DOC_ECCCONF1);
}

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
/**
 * doc_correct_data - Fix if need be read data from flash
 * @docg3: the device
 * @buf: the buffer of read data (512 + 7 + 1 bytes)
 * @hwecc: the hardware calculated ECC.
 *         It's in fact recv_ecc ^ calc_ecc, where recv_ecc was read from OOB
 *         area data, and calc_ecc the ECC calculated by the hardware generator.
 *
 * Checks if the received data matches the ECC, and if an error is detected,
 * tries to fix the bit flips (at most 4) in the buffer buf.  As the docg3
 * understands the (data, ecc, syndroms) in an inverted order in comparison to
 * the BCH library, the function reverses the order of bits (ie. bit7 and bit0,
 * bit6 and bit 1, ...) for all ECC data.
 *
 * The hardware ecc unit produces oob_ecc ^ calc_ecc.  The kernel's bch
 * algorithm is used to decode this.  However the hw operates on page
 * data in a bit order that is the reverse of that of the bch alg,
 * requiring that the bits be reversed on the result.  Thanks to Ivan
 * Djelic for his analysis.
 *
 * Returns number of fixed bits (0, 1, 2, 3, 4) or -EBADMSG if too many bit
 * errors were detected and cannot be fixed.
 */
static int doc_ecc_bch_fix_data(struct docg3 *docg3, void *buf, u8 *hwecc)
{
	u8 ecc[DOC_ECC_BCH_SIZE];
	int errorpos[DOC_ECC_BCH_T], i, numerrs;

	for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
		ecc[i] = bitrev8(hwecc[i]);
	numerrs = decode_bch(docg3_bch, NULL, DOC_ECC_BCH_COVERED_BYTES,
			     NULL, ecc, NULL, errorpos);
	BUG_ON(numerrs == -EINVAL);
	if (numerrs < 0)
		goto out;

	for (i = 0; i < numerrs; i++)
		errorpos[i] = (errorpos[i] & ~7) | (7 - (errorpos[i] & 7));
	for (i = 0; i < numerrs; i++)
		if (errorpos[i] < DOC_ECC_BCH_COVERED_BYTES*8)
			/* error is located in data, correct it */
			change_bit(errorpos[i], buf);
out:
	doc_dbg("doc_ecc_bch_fix_data: flipped %d bits\n", numerrs);
	return numerrs;
}


R
Robert Jarzmik 已提交
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
/**
 * doc_read_page_prepare - Prepares reading data from a flash page
 * @docg3: the device
 * @block0: the first plane block index on flash memory
 * @block1: the second plane block index on flash memory
 * @page: the page index in the block
 * @offset: the offset in the page (must be a multiple of 4)
 *
 * Prepares the page to be read in the flash memory :
 *   - tell ASIC to map the flash pages
 *   - tell ASIC to be in read mode
 *
 * After a call to this method, a call to doc_read_page_finish is mandatory,
 * to end the read cycle of the flash.
 *
 * Read data from a flash page. The length to be read must be between 0 and
 * (page_size + oob_size + wear_size), ie. 532, and a multiple of 4 (because
 * the extra bytes reading is not implemented).
 *
 * As pages are grouped by 2 (in 2 planes), reading from a page must be done
 * in two steps:
 *  - one read of 512 bytes at offset 0
 *  - one read of 512 bytes at offset 512 + 16
 *
 * Returns 0 if successful, -EIO if a read error occured.
 */
static int doc_read_page_prepare(struct docg3 *docg3, int block0, int block1,
				 int page, int offset)
{
	int wear_area = 0, ret = 0;

	doc_dbg("doc_read_page_prepare(blocks=(%d,%d), page=%d, ofsInPage=%d)\n",
		block0, block1, page, offset);
	if (offset >= DOC_LAYOUT_WEAR_OFFSET)
		wear_area = 1;
	if (!wear_area && offset > (DOC_LAYOUT_PAGE_OOB_SIZE * 2))
		return -EINVAL;

	doc_set_device_id(docg3, docg3->device_id);
	ret = doc_reset_seq(docg3);
	if (ret)
		goto err;

	/* Program the flash address block and page */
	ret = doc_read_seek(docg3, block0, block1, page, wear_area, offset);
	if (ret)
		goto err;

	doc_flash_command(docg3, DOC_CMD_READ_ALL_PLANES);
	doc_delay(docg3, 2);
	doc_wait_ready(docg3);

	doc_flash_command(docg3, DOC_CMD_SET_ADDR_READ);
	doc_delay(docg3, 1);
	if (offset >= DOC_LAYOUT_PAGE_SIZE * 2)
		offset -= 2 * DOC_LAYOUT_PAGE_SIZE;
	doc_flash_address(docg3, offset >> 2);
	doc_delay(docg3, 1);
	doc_wait_ready(docg3);

	doc_flash_command(docg3, DOC_CMD_READ_FLASH);

	return 0;
err:
	doc_writeb(docg3, 0, DOC_DATAEND);
	doc_delay(docg3, 2);
	return -EIO;
}

/**
 * doc_read_page_getbytes - Reads bytes from a prepared page
 * @docg3: the device
 * @len: the number of bytes to be read (must be a multiple of 4)
 * @buf: the buffer to be filled in
 * @first: 1 if first time read, DOC_READADDRESS should be set
 *
 */
static int doc_read_page_getbytes(struct docg3 *docg3, int len, u_char *buf,
				  int first)
{
	doc_read_data_area(docg3, buf, len, first);
	doc_delay(docg3, 2);
	return len;
}

R
Robert Jarzmik 已提交
749 750 751 752 753 754 755 756 757 758 759 760 761 762
/**
 * doc_write_page_putbytes - Writes bytes into a prepared page
 * @docg3: the device
 * @len: the number of bytes to be written
 * @buf: the buffer of input bytes
 *
 */
static void doc_write_page_putbytes(struct docg3 *docg3, int len,
				    const u_char *buf)
{
	doc_write_data_area(docg3, buf, len);
	doc_delay(docg3, 2);
}

R
Robert Jarzmik 已提交
763 764 765 766 767
/**
 * doc_get_hw_bch_syndroms - Get hardware calculated BCH syndroms
 * @docg3: the device
 * @syns:  the array of 7 integers where the syndroms will be stored
 */
R
Robert Jarzmik 已提交
768
static void doc_get_hw_bch_syndroms(struct docg3 *docg3, u8 *syns)
R
Robert Jarzmik 已提交
769 770 771 772 773 774 775
{
	int i;

	for (i = 0; i < DOC_ECC_BCH_SIZE; i++)
		syns[i] = doc_register_readb(docg3, DOC_BCH_SYNDROM(i));
}

R
Robert Jarzmik 已提交
776 777 778 779 780 781 782 783 784 785
/**
 * doc_page_finish - Ends reading/writing of a flash page
 * @docg3: the device
 */
static void doc_page_finish(struct docg3 *docg3)
{
	doc_writeb(docg3, 0, DOC_DATAEND);
	doc_delay(docg3, 2);
}

R
Robert Jarzmik 已提交
786 787 788 789 790 791 792 793 794 795
/**
 * doc_read_page_finish - Ends reading of a flash page
 * @docg3: the device
 *
 * As a side effect, resets the chip selector to 0. This ensures that after each
 * read operation, the floor 0 is selected. Therefore, if the systems halts, the
 * reboot will boot on floor 0, where the IPL is.
 */
static void doc_read_page_finish(struct docg3 *docg3)
{
R
Robert Jarzmik 已提交
796
	doc_page_finish(docg3);
R
Robert Jarzmik 已提交
797 798 799 800 801 802 803 804 805 806 807
	doc_set_device_id(docg3, 0);
}

/**
 * calc_block_sector - Calculate blocks, pages and ofs.

 * @from: offset in flash
 * @block0: first plane block index calculated
 * @block1: second plane block index calculated
 * @page: page calculated
 * @ofs: offset in page
R
Robert Jarzmik 已提交
808 809 810 811 812 813
 * @reliable: 0 if docg3 in normal mode, 1 if docg3 in fast mode, 2 if docg3 in
 * reliable mode.
 *
 * The calculation is based on the reliable/normal mode. In normal mode, the 64
 * pages of a block are available. In reliable mode, as pages 2*n and 2*n+1 are
 * clones, only 32 pages per block are available.
R
Robert Jarzmik 已提交
814 815
 */
static void calc_block_sector(loff_t from, int *block0, int *block1, int *page,
R
Robert Jarzmik 已提交
816
			      int *ofs, int reliable)
R
Robert Jarzmik 已提交
817
{
R
Robert Jarzmik 已提交
818 819 820 821 822
	uint sector, pages_biblock;

	pages_biblock = DOC_LAYOUT_PAGES_PER_BLOCK * DOC_LAYOUT_NBPLANES;
	if (reliable == 1 || reliable == 2)
		pages_biblock /= 2;
R
Robert Jarzmik 已提交
823 824

	sector = from / DOC_LAYOUT_PAGE_SIZE;
R
Robert Jarzmik 已提交
825
	*block0 = sector / pages_biblock * DOC_LAYOUT_NBPLANES;
R
Robert Jarzmik 已提交
826
	*block1 = *block0 + 1;
R
Robert Jarzmik 已提交
827
	*page = sector % pages_biblock;
R
Robert Jarzmik 已提交
828
	*page /= DOC_LAYOUT_NBPLANES;
R
Robert Jarzmik 已提交
829 830
	if (reliable == 1 || reliable == 2)
		*page *= 2;
R
Robert Jarzmik 已提交
831 832 833 834 835 836 837
	if (sector % 2)
		*ofs = DOC_LAYOUT_PAGE_OOB_SIZE;
	else
		*ofs = 0;
}

/**
838
 * doc_read_oob - Read out of band bytes from flash
R
Robert Jarzmik 已提交
839 840 841
 * @mtd: the device
 * @from: the offset from first block and first page, in bytes, aligned on page
 *        size
842
 * @ops: the mtd oob structure
R
Robert Jarzmik 已提交
843
 *
844
 * Reads flash memory OOB area of pages.
R
Robert Jarzmik 已提交
845 846 847
 *
 * Returns 0 if read successfull, of -EIO, -EINVAL if an error occured
 */
848 849
static int doc_read_oob(struct mtd_info *mtd, loff_t from,
			struct mtd_oob_ops *ops)
R
Robert Jarzmik 已提交
850 851
{
	struct docg3 *docg3 = mtd->priv;
852 853 854 855
	int block0, block1, page, ret, ofs = 0;
	u8 *oobbuf = ops->oobbuf;
	u8 *buf = ops->datbuf;
	size_t len, ooblen, nbdata, nboob;
856
	u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1;
857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874

	if (buf)
		len = ops->len;
	else
		len = 0;
	if (oobbuf)
		ooblen = ops->ooblen;
	else
		ooblen = 0;

	if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB)
		oobbuf += ops->ooboffs;

	doc_dbg("doc_read_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
		from, ops->mode, buf, len, oobbuf, ooblen);
	if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % DOC_LAYOUT_OOB_SIZE) ||
	    (from % DOC_LAYOUT_PAGE_SIZE))
		return -EINVAL;
R
Robert Jarzmik 已提交
875 876

	ret = -EINVAL;
R
Robert Jarzmik 已提交
877 878
	calc_block_sector(from + len, &block0, &block1, &page, &ofs,
			  docg3->reliable);
R
Robert Jarzmik 已提交
879 880 881
	if (block1 > docg3->max_block)
		goto err;

882 883
	ops->oobretlen = 0;
	ops->retlen = 0;
R
Robert Jarzmik 已提交
884
	ret = 0;
885
	while (!ret && (len > 0 || ooblen > 0)) {
R
Robert Jarzmik 已提交
886 887
		calc_block_sector(from, &block0, &block1, &page, &ofs,
			docg3->reliable);
888 889
		nbdata = min_t(size_t, len, (size_t)DOC_LAYOUT_PAGE_SIZE);
		nboob = min_t(size_t, ooblen, (size_t)DOC_LAYOUT_OOB_SIZE);
R
Robert Jarzmik 已提交
890 891 892
		ret = doc_read_page_prepare(docg3, block0, block1, page, ofs);
		if (ret < 0)
			goto err;
893
		ret = doc_read_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
R
Robert Jarzmik 已提交
894 895
		if (ret < 0)
			goto err_in_read;
896 897
		ret = doc_read_page_getbytes(docg3, nbdata, buf, 1);
		if (ret < nbdata)
R
Robert Jarzmik 已提交
898
			goto err_in_read;
899 900 901 902
		doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE - nbdata,
				       NULL, 0);
		ret = doc_read_page_getbytes(docg3, nboob, oobbuf, 0);
		if (ret < nboob)
R
Robert Jarzmik 已提交
903
			goto err_in_read;
904 905
		doc_read_page_getbytes(docg3, DOC_LAYOUT_OOB_SIZE - nboob,
				       NULL, 0);
R
Robert Jarzmik 已提交
906

907
		doc_get_hw_bch_syndroms(docg3, hwecc);
R
Robert Jarzmik 已提交
908 909
		eccconf1 = doc_register_readb(docg3, DOC_ECCCONF1);

910 911 912 913 914 915 916 917 918 919
		if (nboob >= DOC_LAYOUT_OOB_SIZE) {
			doc_dbg("OOB - INFO: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
				oobbuf[0], oobbuf[1], oobbuf[2], oobbuf[3],
				oobbuf[4], oobbuf[5], oobbuf[6]);
			doc_dbg("OOB - HAMMING: %02x\n", oobbuf[7]);
			doc_dbg("OOB - BCH_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
				oobbuf[8], oobbuf[9], oobbuf[10], oobbuf[11],
				oobbuf[12], oobbuf[13], oobbuf[14]);
			doc_dbg("OOB - UNUSED: %02x\n", oobbuf[15]);
		}
R
Robert Jarzmik 已提交
920
		doc_dbg("ECC checks: ECCConf1=%x\n", eccconf1);
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
		doc_dbg("ECC HW_ECC: %02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
			hwecc[0], hwecc[1], hwecc[2], hwecc[3], hwecc[4],
			hwecc[5], hwecc[6]);

		ret = -EIO;
		if (is_prot_seq_error(docg3))
			goto err_in_read;
		ret = 0;
		if ((block0 >= DOC_LAYOUT_BLOCK_FIRST_DATA) &&
		    (eccconf1 & DOC_ECCCONF1_BCH_SYNDROM_ERR) &&
		    (eccconf1 & DOC_ECCCONF1_PAGE_IS_WRITTEN) &&
		    (ops->mode != MTD_OPS_RAW) &&
		    (nbdata == DOC_LAYOUT_PAGE_SIZE)) {
			ret = doc_ecc_bch_fix_data(docg3, buf, hwecc);
			if (ret < 0) {
				mtd->ecc_stats.failed++;
				ret = -EBADMSG;
			}
			if (ret > 0) {
				mtd->ecc_stats.corrected += ret;
				ret = -EUCLEAN;
			}
R
Robert Jarzmik 已提交
943
		}
944

R
Robert Jarzmik 已提交
945
		doc_read_page_finish(docg3);
946 947 948 949 950 951 952
		ops->retlen += nbdata;
		ops->oobretlen += nboob;
		buf += nbdata;
		oobbuf += nboob;
		len -= nbdata;
		ooblen -= nboob;
		from += DOC_LAYOUT_PAGE_SIZE;
R
Robert Jarzmik 已提交
953 954
	}

955
	return ret;
R
Robert Jarzmik 已提交
956 957 958 959 960 961 962
err_in_read:
	doc_read_page_finish(docg3);
err:
	return ret;
}

/**
963
 * doc_read - Read bytes from flash
R
Robert Jarzmik 已提交
964 965 966
 * @mtd: the device
 * @from: the offset from first block and first page, in bytes, aligned on page
 *        size
967 968 969
 * @len: the number of bytes to read (must be a multiple of 4)
 * @retlen: the number of bytes actually read
 * @buf: the filled in buffer
R
Robert Jarzmik 已提交
970
 *
971 972
 * Reads flash memory pages. This function does not read the OOB chunk, but only
 * the page data.
R
Robert Jarzmik 已提交
973 974 975
 *
 * Returns 0 if read successfull, of -EIO, -EINVAL if an error occured
 */
976 977
static int doc_read(struct mtd_info *mtd, loff_t from, size_t len,
	     size_t *retlen, u_char *buf)
R
Robert Jarzmik 已提交
978
{
979 980
	struct mtd_oob_ops ops;
	size_t ret;
R
Robert Jarzmik 已提交
981

982 983 984 985
	memset(&ops, 0, sizeof(ops));
	ops.datbuf = buf;
	ops.len = len;
	ops.mode = MTD_OPS_AUTO_OOB;
R
Robert Jarzmik 已提交
986

987 988 989
	ret = doc_read_oob(mtd, from, &ops);
	*retlen = ops.retlen;
	return ret;
R
Robert Jarzmik 已提交
990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025
}

static int doc_reload_bbt(struct docg3 *docg3)
{
	int block = DOC_LAYOUT_BLOCK_BBT;
	int ret = 0, nbpages, page;
	u_char *buf = docg3->bbt;

	nbpages = DIV_ROUND_UP(docg3->max_block + 1, 8 * DOC_LAYOUT_PAGE_SIZE);
	for (page = 0; !ret && (page < nbpages); page++) {
		ret = doc_read_page_prepare(docg3, block, block + 1,
					    page + DOC_LAYOUT_PAGE_BBT, 0);
		if (!ret)
			ret = doc_read_page_ecc_init(docg3,
						     DOC_LAYOUT_PAGE_SIZE);
		if (!ret)
			doc_read_page_getbytes(docg3, DOC_LAYOUT_PAGE_SIZE,
					       buf, 1);
		buf += DOC_LAYOUT_PAGE_SIZE;
	}
	doc_read_page_finish(docg3);
	return ret;
}

/**
 * doc_block_isbad - Checks whether a block is good or not
 * @mtd: the device
 * @from: the offset to find the correct block
 *
 * Returns 1 if block is bad, 0 if block is good
 */
static int doc_block_isbad(struct mtd_info *mtd, loff_t from)
{
	struct docg3 *docg3 = mtd->priv;
	int block0, block1, page, ofs, is_good;

R
Robert Jarzmik 已提交
1026 1027
	calc_block_sector(from, &block0, &block1, &page, &ofs,
		docg3->reliable);
R
Robert Jarzmik 已提交
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058
	doc_dbg("doc_block_isbad(from=%lld) => block=(%d,%d), page=%d, ofs=%d\n",
		from, block0, block1, page, ofs);

	if (block0 < DOC_LAYOUT_BLOCK_FIRST_DATA)
		return 0;
	if (block1 > docg3->max_block)
		return -EINVAL;

	is_good = docg3->bbt[block0 >> 3] & (1 << (block0 & 0x7));
	return !is_good;
}

/**
 * doc_get_erase_count - Get block erase count
 * @docg3: the device
 * @from: the offset in which the block is.
 *
 * Get the number of times a block was erased. The number is the maximum of
 * erase times between first and second plane (which should be equal normally).
 *
 * Returns The number of erases, or -EINVAL or -EIO on error.
 */
static int doc_get_erase_count(struct docg3 *docg3, loff_t from)
{
	u8 buf[DOC_LAYOUT_WEAR_SIZE];
	int ret, plane1_erase_count, plane2_erase_count;
	int block0, block1, page, ofs;

	doc_dbg("doc_get_erase_count(from=%lld, buf=%p)\n", from, buf);
	if (from % DOC_LAYOUT_PAGE_SIZE)
		return -EINVAL;
R
Robert Jarzmik 已提交
1059
	calc_block_sector(from, &block0, &block1, &page, &ofs, docg3->reliable);
R
Robert Jarzmik 已提交
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
	if (block1 > docg3->max_block)
		return -EINVAL;

	ret = doc_reset_seq(docg3);
	if (!ret)
		ret = doc_read_page_prepare(docg3, block0, block1, page,
					    ofs + DOC_LAYOUT_WEAR_OFFSET);
	if (!ret)
		ret = doc_read_page_getbytes(docg3, DOC_LAYOUT_WEAR_SIZE,
					     buf, 1);
	doc_read_page_finish(docg3);

	if (ret || (buf[0] != DOC_ERASE_MARK) || (buf[2] != DOC_ERASE_MARK))
		return -EIO;
	plane1_erase_count = (u8)(~buf[1]) | ((u8)(~buf[4]) << 8)
		| ((u8)(~buf[5]) << 16);
	plane2_erase_count = (u8)(~buf[3]) | ((u8)(~buf[6]) << 8)
		| ((u8)(~buf[7]) << 16);

	return max(plane1_erase_count, plane2_erase_count);
}

R
Robert Jarzmik 已提交
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
/**
 * doc_get_op_status - get erase/write operation status
 * @docg3: the device
 *
 * Queries the status from the chip, and returns it
 *
 * Returns the status (bits DOC_PLANES_STATUS_*)
 */
static int doc_get_op_status(struct docg3 *docg3)
{
	u8 status;

	doc_flash_sequence(docg3, DOC_SEQ_PLANES_STATUS);
	doc_flash_command(docg3, DOC_CMD_PLANES_STATUS);
	doc_delay(docg3, 5);

	doc_ecc_disable(docg3);
	doc_read_data_area(docg3, &status, 1, 1);
	return status;
}

/**
 * doc_write_erase_wait_status - wait for write or erase completion
 * @docg3: the device
 *
 * Wait for the chip to be ready again after erase or write operation, and check
 * erase/write status.
 *
 * Returns 0 if erase successfull, -EIO if erase/write issue, -ETIMEOUT if
 * timeout
 */
static int doc_write_erase_wait_status(struct docg3 *docg3)
{
	int status, ret = 0;

	if (!doc_is_ready(docg3))
		usleep_range(3000, 3000);
	if (!doc_is_ready(docg3)) {
		doc_dbg("Timeout reached and the chip is still not ready\n");
		ret = -EAGAIN;
		goto out;
	}

	status = doc_get_op_status(docg3);
	if (status & DOC_PLANES_STATUS_FAIL) {
		doc_dbg("Erase/Write failed on (a) plane(s), status = %x\n",
			status);
		ret = -EIO;
	}

out:
	doc_page_finish(docg3);
	return ret;
}

R
Robert Jarzmik 已提交
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
/**
 * doc_erase_block - Erase a couple of blocks
 * @docg3: the device
 * @block0: the first block to erase (leftmost plane)
 * @block1: the second block to erase (rightmost plane)
 *
 * Erase both blocks, and return operation status
 *
 * Returns 0 if erase successful, -EIO if erase issue, -ETIMEOUT if chip not
 * ready for too long
 */
static int doc_erase_block(struct docg3 *docg3, int block0, int block1)
{
	int ret, sector;

	doc_dbg("doc_erase_block(blocks=(%d,%d))\n", block0, block1);
	ret = doc_reset_seq(docg3);
	if (ret)
		return -EIO;

	doc_set_reliable_mode(docg3);
	doc_flash_sequence(docg3, DOC_SEQ_ERASE);

	sector = block0 << DOC_ADDR_BLOCK_SHIFT;
	doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
	doc_setup_addr_sector(docg3, sector);
	sector = block1 << DOC_ADDR_BLOCK_SHIFT;
	doc_flash_command(docg3, DOC_CMD_PROG_BLOCK_ADDR);
	doc_setup_addr_sector(docg3, sector);
	doc_delay(docg3, 1);

	doc_flash_command(docg3, DOC_CMD_ERASECYCLE2);
	doc_delay(docg3, 2);

	if (is_prot_seq_error(docg3)) {
		doc_err("Erase blocks %d,%d error\n", block0, block1);
		return -EIO;
	}

	return doc_write_erase_wait_status(docg3);
}

/**
 * doc_erase - Erase a portion of the chip
 * @mtd: the device
 * @info: the erase info
 *
 * Erase a bunch of contiguous blocks, by pairs, as a "mtd" page of 1024 is
 * split into 2 pages of 512 bytes on 2 contiguous blocks.
 *
 * Returns 0 if erase successful, -EINVAL if adressing error, -EIO if erase
 * issue
 */
static int doc_erase(struct mtd_info *mtd, struct erase_info *info)
{
	struct docg3 *docg3 = mtd->priv;
	uint64_t len;
	int block0, block1, page, ret, ofs = 0;

	doc_dbg("doc_erase(from=%lld, len=%lld\n", info->addr, info->len);
	doc_set_device_id(docg3, docg3->device_id);

	info->state = MTD_ERASE_PENDING;
R
Robert Jarzmik 已提交
1200 1201
	calc_block_sector(info->addr + info->len, &block0, &block1, &page,
			  &ofs, docg3->reliable);
R
Robert Jarzmik 已提交
1202 1203 1204 1205 1206
	ret = -EINVAL;
	if (block1 > docg3->max_block || page || ofs)
		goto reset_err;

	ret = 0;
R
Robert Jarzmik 已提交
1207 1208
	calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
			  docg3->reliable);
R
Robert Jarzmik 已提交
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227
	doc_set_reliable_mode(docg3);
	for (len = info->len; !ret && len > 0; len -= mtd->erasesize) {
		info->state = MTD_ERASING;
		ret = doc_erase_block(docg3, block0, block1);
		block0 += 2;
		block1 += 2;
	}

	if (ret)
		goto reset_err;

	info->state = MTD_ERASE_DONE;
	return 0;

reset_err:
	info->state = MTD_ERASE_FAILED;
	return ret;
}

R
Robert Jarzmik 已提交
1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253
/**
 * doc_write_page - Write a single page to the chip
 * @docg3: the device
 * @to: the offset from first block and first page, in bytes, aligned on page
 *      size
 * @buf: buffer to get bytes from
 * @oob: buffer to get out of band bytes from (can be NULL if no OOB should be
 *       written)
 * @autoecc: if 0, all 16 bytes from OOB are taken, regardless of HW Hamming or
 *           BCH computations. If 1, only bytes 0-7 and byte 15 are taken,
 *           remaining ones are filled with hardware Hamming and BCH
 *           computations. Its value is not meaningfull is oob == NULL.
 *
 * Write one full page (ie. 1 page split on two planes), of 512 bytes, with the
 * OOB data. The OOB ECC is automatically computed by the hardware Hamming and
 * BCH generator if autoecc is not null.
 *
 * Returns 0 if write successful, -EIO if write error, -EAGAIN if timeout
 */
static int doc_write_page(struct docg3 *docg3, loff_t to, const u_char *buf,
			  const u_char *oob, int autoecc)
{
	int block0, block1, page, ret, ofs = 0;
	u8 syn[DOC_ECC_BCH_SIZE], hamming;

	doc_dbg("doc_write_page(to=%lld)\n", to);
R
Robert Jarzmik 已提交
1254
	calc_block_sector(to, &block0, &block1, &page, &ofs, docg3->reliable);
R
Robert Jarzmik 已提交
1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265

	doc_set_device_id(docg3, docg3->device_id);
	ret = doc_reset_seq(docg3);
	if (ret)
		goto err;

	/* Program the flash address block and page */
	ret = doc_write_seek(docg3, block0, block1, page, ofs);
	if (ret)
		goto err;

1266
	doc_write_page_ecc_init(docg3, DOC_ECC_BCH_TOTAL_BYTES);
R
Robert Jarzmik 已提交
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440
	doc_delay(docg3, 2);
	doc_write_page_putbytes(docg3, DOC_LAYOUT_PAGE_SIZE, buf);

	if (oob && autoecc) {
		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ, oob);
		doc_delay(docg3, 2);
		oob += DOC_LAYOUT_OOB_UNUSED_OFS;

		hamming = doc_register_readb(docg3, DOC_HAMMINGPARITY);
		doc_delay(docg3, 2);
		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_HAMMING_SZ,
					&hamming);
		doc_delay(docg3, 2);

		doc_get_hw_bch_syndroms(docg3, syn);
		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_BCH_SZ, syn);
		doc_delay(docg3, 2);

		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_UNUSED_SZ, oob);
	}
	if (oob && !autoecc)
		doc_write_page_putbytes(docg3, DOC_LAYOUT_OOB_SIZE, oob);

	doc_delay(docg3, 2);
	doc_page_finish(docg3);
	doc_delay(docg3, 2);
	doc_flash_command(docg3, DOC_CMD_PROG_CYCLE2);
	doc_delay(docg3, 2);

	/*
	 * The wait status will perform another doc_page_finish() call, but that
	 * seems to please the docg3, so leave it.
	 */
	ret = doc_write_erase_wait_status(docg3);
	return ret;
err:
	doc_read_page_finish(docg3);
	return ret;
}

/**
 * doc_guess_autoecc - Guess autoecc mode from mbd_oob_ops
 * @ops: the oob operations
 *
 * Returns 0 or 1 if success, -EINVAL if invalid oob mode
 */
static int doc_guess_autoecc(struct mtd_oob_ops *ops)
{
	int autoecc;

	switch (ops->mode) {
	case MTD_OPS_PLACE_OOB:
	case MTD_OPS_AUTO_OOB:
		autoecc = 1;
		break;
	case MTD_OPS_RAW:
		autoecc = 0;
		break;
	default:
		autoecc = -EINVAL;
	}
	return autoecc;
}

/**
 * doc_fill_autooob - Fill a 16 bytes OOB from 8 non-ECC bytes
 * @dst: the target 16 bytes OOB buffer
 * @oobsrc: the source 8 bytes non-ECC OOB buffer
 *
 */
static void doc_fill_autooob(u8 *dst, u8 *oobsrc)
{
	memcpy(dst, oobsrc, DOC_LAYOUT_OOB_PAGEINFO_SZ);
	dst[DOC_LAYOUT_OOB_UNUSED_OFS] = oobsrc[DOC_LAYOUT_OOB_PAGEINFO_SZ];
}

/**
 * doc_backup_oob - Backup OOB into docg3 structure
 * @docg3: the device
 * @to: the page offset in the chip
 * @ops: the OOB size and buffer
 *
 * As the docg3 should write a page with its OOB in one pass, and some userland
 * applications do write_oob() to setup the OOB and then write(), store the OOB
 * into a temporary storage. This is very dangerous, as 2 concurrent
 * applications could store an OOB, and then write their pages (which will
 * result into one having its OOB corrupted).
 *
 * The only reliable way would be for userland to call doc_write_oob() with both
 * the page data _and_ the OOB area.
 *
 * Returns 0 if success, -EINVAL if ops content invalid
 */
static int doc_backup_oob(struct docg3 *docg3, loff_t to,
			  struct mtd_oob_ops *ops)
{
	int ooblen = ops->ooblen, autoecc;

	if (ooblen != DOC_LAYOUT_OOB_SIZE)
		return -EINVAL;
	autoecc = doc_guess_autoecc(ops);
	if (autoecc < 0)
		return autoecc;

	docg3->oob_write_ofs = to;
	docg3->oob_autoecc = autoecc;
	if (ops->mode == MTD_OPS_AUTO_OOB) {
		doc_fill_autooob(docg3->oob_write_buf, ops->oobbuf);
		ops->oobretlen = 8;
	} else {
		memcpy(docg3->oob_write_buf, ops->oobbuf, DOC_LAYOUT_OOB_SIZE);
		ops->oobretlen = DOC_LAYOUT_OOB_SIZE;
	}
	return 0;
}

/**
 * doc_write_oob - Write out of band bytes to flash
 * @mtd: the device
 * @ofs: the offset from first block and first page, in bytes, aligned on page
 *       size
 * @ops: the mtd oob structure
 *
 * Either write OOB data into a temporary buffer, for the subsequent write
 * page. The provided OOB should be 16 bytes long. If a data buffer is provided
 * as well, issue the page write.
 * Or provide data without OOB, and then a all zeroed OOB will be used (ECC will
 * still be filled in if asked for).
 *
 * Returns 0 is successfull, EINVAL if length is not 14 bytes
 */
static int doc_write_oob(struct mtd_info *mtd, loff_t ofs,
			 struct mtd_oob_ops *ops)
{
	struct docg3 *docg3 = mtd->priv;
	int block0, block1, page, ret, pofs = 0, autoecc, oobdelta;
	u8 *oobbuf = ops->oobbuf;
	u8 *buf = ops->datbuf;
	size_t len, ooblen;
	u8 oob[DOC_LAYOUT_OOB_SIZE];

	if (buf)
		len = ops->len;
	else
		len = 0;
	if (oobbuf)
		ooblen = ops->ooblen;
	else
		ooblen = 0;

	if (oobbuf && ops->mode == MTD_OPS_PLACE_OOB)
		oobbuf += ops->ooboffs;

	doc_dbg("doc_write_oob(from=%lld, mode=%d, data=(%p:%zu), oob=(%p:%zu))\n",
		ofs, ops->mode, buf, len, oobbuf, ooblen);
	switch (ops->mode) {
	case MTD_OPS_PLACE_OOB:
	case MTD_OPS_RAW:
		oobdelta = mtd->oobsize;
		break;
	case MTD_OPS_AUTO_OOB:
		oobdelta = mtd->ecclayout->oobavail;
		break;
	default:
		oobdelta = 0;
	}
	if ((len % DOC_LAYOUT_PAGE_SIZE) || (ooblen % oobdelta) ||
	    (ofs % DOC_LAYOUT_PAGE_SIZE))
		return -EINVAL;
	if (len && ooblen &&
	    (len / DOC_LAYOUT_PAGE_SIZE) != (ooblen / oobdelta))
		return -EINVAL;

	ret = -EINVAL;
R
Robert Jarzmik 已提交
1441 1442
	calc_block_sector(ofs + len, &block0, &block1, &page, &pofs,
			  docg3->reliable);
R
Robert Jarzmik 已提交
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515
	if (block1 > docg3->max_block)
		goto err;

	ops->oobretlen = 0;
	ops->retlen = 0;
	ret = 0;
	if (len == 0 && ooblen == 0)
		return -EINVAL;
	if (len == 0 && ooblen > 0)
		return doc_backup_oob(docg3, ofs, ops);

	autoecc = doc_guess_autoecc(ops);
	if (autoecc < 0)
		return autoecc;

	while (!ret && len > 0) {
		memset(oob, 0, sizeof(oob));
		if (ofs == docg3->oob_write_ofs)
			memcpy(oob, docg3->oob_write_buf, DOC_LAYOUT_OOB_SIZE);
		else if (ooblen > 0 && ops->mode == MTD_OPS_AUTO_OOB)
			doc_fill_autooob(oob, oobbuf);
		else if (ooblen > 0)
			memcpy(oob, oobbuf, DOC_LAYOUT_OOB_SIZE);
		ret = doc_write_page(docg3, ofs, buf, oob, autoecc);

		ofs += DOC_LAYOUT_PAGE_SIZE;
		len -= DOC_LAYOUT_PAGE_SIZE;
		buf += DOC_LAYOUT_PAGE_SIZE;
		if (ooblen) {
			oobbuf += oobdelta;
			ooblen -= oobdelta;
			ops->oobretlen += oobdelta;
		}
		ops->retlen += DOC_LAYOUT_PAGE_SIZE;
	}
err:
	doc_set_device_id(docg3, 0);
	return ret;
}

/**
 * doc_write - Write a buffer to the chip
 * @mtd: the device
 * @to: the offset from first block and first page, in bytes, aligned on page
 *      size
 * @len: the number of bytes to write (must be a full page size, ie. 512)
 * @retlen: the number of bytes actually written (0 or 512)
 * @buf: the buffer to get bytes from
 *
 * Writes data to the chip.
 *
 * Returns 0 if write successful, -EIO if write error
 */
static int doc_write(struct mtd_info *mtd, loff_t to, size_t len,
		     size_t *retlen, const u_char *buf)
{
	struct docg3 *docg3 = mtd->priv;
	int ret;
	struct mtd_oob_ops ops;

	doc_dbg("doc_write(to=%lld, len=%zu)\n", to, len);
	ops.datbuf = (char *)buf;
	ops.len = len;
	ops.mode = MTD_OPS_PLACE_OOB;
	ops.oobbuf = NULL;
	ops.ooblen = 0;
	ops.ooboffs = 0;

	ret = doc_write_oob(mtd, to, &ops);
	*retlen = ops.retlen;
	return ret;
}

1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
static struct docg3 *sysfs_dev2docg3(struct device *dev,
				     struct device_attribute *attr)
{
	int floor;
	struct platform_device *pdev = to_platform_device(dev);
	struct mtd_info **docg3_floors = platform_get_drvdata(pdev);

	floor = attr->attr.name[1] - '0';
	if (floor < 0 || floor >= DOC_MAX_NBFLOORS)
		return NULL;
	else
		return docg3_floors[floor]->priv;
}

static ssize_t dps0_is_key_locked(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
	int dps0;

	doc_set_device_id(docg3, docg3->device_id);
	dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
	doc_set_device_id(docg3, 0);

	return sprintf(buf, "%d\n", !(dps0 & DOC_DPS_KEY_OK));
}

static ssize_t dps1_is_key_locked(struct device *dev,
				  struct device_attribute *attr, char *buf)
{
	struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
	int dps1;

	doc_set_device_id(docg3, docg3->device_id);
	dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
	doc_set_device_id(docg3, 0);

	return sprintf(buf, "%d\n", !(dps1 & DOC_DPS_KEY_OK));
}

static ssize_t dps0_insert_key(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count)
{
	struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
	int i;

	if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
		return -EINVAL;

	doc_set_device_id(docg3, docg3->device_id);
	for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
		doc_writeb(docg3, buf[i], DOC_DPS0_KEY);
	doc_set_device_id(docg3, 0);
	return count;
}

static ssize_t dps1_insert_key(struct device *dev,
			       struct device_attribute *attr,
			       const char *buf, size_t count)
{
	struct docg3 *docg3 = sysfs_dev2docg3(dev, attr);
	int i;

	if (count != DOC_LAYOUT_DPS_KEY_LENGTH)
		return -EINVAL;

	doc_set_device_id(docg3, docg3->device_id);
	for (i = 0; i < DOC_LAYOUT_DPS_KEY_LENGTH; i++)
		doc_writeb(docg3, buf[i], DOC_DPS1_KEY);
	doc_set_device_id(docg3, 0);
	return count;
}

#define FLOOR_SYSFS(id) { \
	__ATTR(f##id##_dps0_is_keylocked, S_IRUGO, dps0_is_key_locked, NULL), \
	__ATTR(f##id##_dps1_is_keylocked, S_IRUGO, dps1_is_key_locked, NULL), \
	__ATTR(f##id##_dps0_protection_key, S_IWUGO, NULL, dps0_insert_key), \
	__ATTR(f##id##_dps1_protection_key, S_IWUGO, NULL, dps1_insert_key), \
}

static struct device_attribute doc_sys_attrs[DOC_MAX_NBFLOORS][4] = {
	FLOOR_SYSFS(0), FLOOR_SYSFS(1), FLOOR_SYSFS(2), FLOOR_SYSFS(3)
};

static int doc_register_sysfs(struct platform_device *pdev,
			      struct mtd_info **floors)
{
	int ret = 0, floor, i = 0;
	struct device *dev = &pdev->dev;

	for (floor = 0; !ret && floor < DOC_MAX_NBFLOORS && floors[floor];
	     floor++)
		for (i = 0; !ret && i < 4; i++)
			ret = device_create_file(dev, &doc_sys_attrs[floor][i]);
	if (!ret)
		return 0;
	do {
		while (--i >= 0)
			device_remove_file(dev, &doc_sys_attrs[floor][i]);
		i = 4;
	} while (--floor >= 0);
	return ret;
}

static void doc_unregister_sysfs(struct platform_device *pdev,
				 struct mtd_info **floors)
{
	struct device *dev = &pdev->dev;
	int floor, i;

	for (floor = 0; floor < DOC_MAX_NBFLOORS && floors[floor];
	     floor++)
		for (i = 0; i < 4; i++)
			device_remove_file(dev, &doc_sys_attrs[floor][i]);
}

R
Robert Jarzmik 已提交
1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703
/*
 * Debug sysfs entries
 */
static int dbg_flashctrl_show(struct seq_file *s, void *p)
{
	struct docg3 *docg3 = (struct docg3 *)s->private;

	int pos = 0;
	u8 fctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);

	pos += seq_printf(s,
		 "FlashControl : 0x%02x (%s,CE# %s,%s,%s,flash %s)\n",
		 fctrl,
		 fctrl & DOC_CTRL_VIOLATION ? "protocol violation" : "-",
		 fctrl & DOC_CTRL_CE ? "active" : "inactive",
		 fctrl & DOC_CTRL_PROTECTION_ERROR ? "protection error" : "-",
		 fctrl & DOC_CTRL_SEQUENCE_ERROR ? "sequence error" : "-",
		 fctrl & DOC_CTRL_FLASHREADY ? "ready" : "not ready");
	return pos;
}
DEBUGFS_RO_ATTR(flashcontrol, dbg_flashctrl_show);

static int dbg_asicmode_show(struct seq_file *s, void *p)
{
	struct docg3 *docg3 = (struct docg3 *)s->private;

	int pos = 0;
	int pctrl = doc_register_readb(docg3, DOC_ASICMODE);
	int mode = pctrl & 0x03;

	pos += seq_printf(s,
			 "%04x : RAM_WE=%d,RSTIN_RESET=%d,BDETCT_RESET=%d,WRITE_ENABLE=%d,POWERDOWN=%d,MODE=%d%d (",
			 pctrl,
			 pctrl & DOC_ASICMODE_RAM_WE ? 1 : 0,
			 pctrl & DOC_ASICMODE_RSTIN_RESET ? 1 : 0,
			 pctrl & DOC_ASICMODE_BDETCT_RESET ? 1 : 0,
			 pctrl & DOC_ASICMODE_MDWREN ? 1 : 0,
			 pctrl & DOC_ASICMODE_POWERDOWN ? 1 : 0,
			 mode >> 1, mode & 0x1);

	switch (mode) {
	case DOC_ASICMODE_RESET:
		pos += seq_printf(s, "reset");
		break;
	case DOC_ASICMODE_NORMAL:
		pos += seq_printf(s, "normal");
		break;
	case DOC_ASICMODE_POWERDOWN:
		pos += seq_printf(s, "powerdown");
		break;
	}
	pos += seq_printf(s, ")\n");
	return pos;
}
DEBUGFS_RO_ATTR(asic_mode, dbg_asicmode_show);

static int dbg_device_id_show(struct seq_file *s, void *p)
{
	struct docg3 *docg3 = (struct docg3 *)s->private;
	int pos = 0;
	int id = doc_register_readb(docg3, DOC_DEVICESELECT);

	pos += seq_printf(s, "DeviceId = %d\n", id);
	return pos;
}
DEBUGFS_RO_ATTR(device_id, dbg_device_id_show);

static int dbg_protection_show(struct seq_file *s, void *p)
{
	struct docg3 *docg3 = (struct docg3 *)s->private;
	int pos = 0;
1704 1705 1706 1707 1708 1709 1710 1711 1712
	int protect, dps0, dps0_low, dps0_high, dps1, dps1_low, dps1_high;

	protect = doc_register_readb(docg3, DOC_PROTECTION);
	dps0 = doc_register_readb(docg3, DOC_DPS0_STATUS);
	dps0_low = doc_register_readw(docg3, DOC_DPS0_ADDRLOW);
	dps0_high = doc_register_readw(docg3, DOC_DPS0_ADDRHIGH);
	dps1 = doc_register_readb(docg3, DOC_DPS1_STATUS);
	dps1_low = doc_register_readw(docg3, DOC_DPS1_ADDRLOW);
	dps1_high = doc_register_readw(docg3, DOC_DPS1_ADDRHIGH);
R
Robert Jarzmik 已提交
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800

	pos += seq_printf(s, "Protection = 0x%02x (",
			 protect);
	if (protect & DOC_PROTECT_FOUNDRY_OTP_LOCK)
		pos += seq_printf(s, "FOUNDRY_OTP_LOCK,");
	if (protect & DOC_PROTECT_CUSTOMER_OTP_LOCK)
		pos += seq_printf(s, "CUSTOMER_OTP_LOCK,");
	if (protect & DOC_PROTECT_LOCK_INPUT)
		pos += seq_printf(s, "LOCK_INPUT,");
	if (protect & DOC_PROTECT_STICKY_LOCK)
		pos += seq_printf(s, "STICKY_LOCK,");
	if (protect & DOC_PROTECT_PROTECTION_ENABLED)
		pos += seq_printf(s, "PROTECTION ON,");
	if (protect & DOC_PROTECT_IPL_DOWNLOAD_LOCK)
		pos += seq_printf(s, "IPL_DOWNLOAD_LOCK,");
	if (protect & DOC_PROTECT_PROTECTION_ERROR)
		pos += seq_printf(s, "PROTECT_ERR,");
	else
		pos += seq_printf(s, "NO_PROTECT_ERR");
	pos += seq_printf(s, ")\n");

	pos += seq_printf(s, "DPS0 = 0x%02x : "
			 "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
			 "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
			 dps0, dps0_low, dps0_high,
			 !!(dps0 & DOC_DPS_OTP_PROTECTED),
			 !!(dps0 & DOC_DPS_READ_PROTECTED),
			 !!(dps0 & DOC_DPS_WRITE_PROTECTED),
			 !!(dps0 & DOC_DPS_HW_LOCK_ENABLED),
			 !!(dps0 & DOC_DPS_KEY_OK));
	pos += seq_printf(s, "DPS1 = 0x%02x : "
			 "Protected area [0x%x - 0x%x] : OTP=%d, READ=%d, "
			 "WRITE=%d, HW_LOCK=%d, KEY_OK=%d\n",
			 dps1, dps1_low, dps1_high,
			 !!(dps1 & DOC_DPS_OTP_PROTECTED),
			 !!(dps1 & DOC_DPS_READ_PROTECTED),
			 !!(dps1 & DOC_DPS_WRITE_PROTECTED),
			 !!(dps1 & DOC_DPS_HW_LOCK_ENABLED),
			 !!(dps1 & DOC_DPS_KEY_OK));
	return pos;
}
DEBUGFS_RO_ATTR(protection, dbg_protection_show);

static int __init doc_dbg_register(struct docg3 *docg3)
{
	struct dentry *root, *entry;

	root = debugfs_create_dir("docg3", NULL);
	if (!root)
		return -ENOMEM;

	entry = debugfs_create_file("flashcontrol", S_IRUSR, root, docg3,
				  &flashcontrol_fops);
	if (entry)
		entry = debugfs_create_file("asic_mode", S_IRUSR, root,
					    docg3, &asic_mode_fops);
	if (entry)
		entry = debugfs_create_file("device_id", S_IRUSR, root,
					    docg3, &device_id_fops);
	if (entry)
		entry = debugfs_create_file("protection", S_IRUSR, root,
					    docg3, &protection_fops);
	if (entry) {
		docg3->debugfs_root = root;
		return 0;
	} else {
		debugfs_remove_recursive(root);
		return -ENOMEM;
	}
}

static void __exit doc_dbg_unregister(struct docg3 *docg3)
{
	debugfs_remove_recursive(docg3->debugfs_root);
}

/**
 * doc_set_driver_info - Fill the mtd_info structure and docg3 structure
 * @chip_id: The chip ID of the supported chip
 * @mtd: The structure to fill
 */
static void __init doc_set_driver_info(int chip_id, struct mtd_info *mtd)
{
	struct docg3 *docg3 = mtd->priv;
	int cfg;

	cfg = doc_register_readb(docg3, DOC_CONFIGURATION);
	docg3->if_cfg = (cfg & DOC_CONF_IF_CFG ? 1 : 0);
R
Robert Jarzmik 已提交
1801
	docg3->reliable = reliable_mode;
R
Robert Jarzmik 已提交
1802 1803 1804

	switch (chip_id) {
	case DOC_CHIPID_G3:
1805 1806
		mtd->name = kasprintf(GFP_KERNEL, "DiskOnChip G3 floor %d",
				      docg3->device_id);
R
Robert Jarzmik 已提交
1807 1808 1809 1810
		docg3->max_block = 2047;
		break;
	}
	mtd->type = MTD_NANDFLASH;
1811
	mtd->flags = MTD_CAP_NANDFLASH;
R
Robert Jarzmik 已提交
1812
	mtd->size = (docg3->max_block + 1) * DOC_LAYOUT_BLOCK_SIZE;
R
Robert Jarzmik 已提交
1813 1814
	if (docg3->reliable == 2)
		mtd->size /= 2;
R
Robert Jarzmik 已提交
1815
	mtd->erasesize = DOC_LAYOUT_BLOCK_SIZE * DOC_LAYOUT_NBPLANES;
R
Robert Jarzmik 已提交
1816 1817
	if (docg3->reliable == 2)
		mtd->erasesize /= 2;
R
Robert Jarzmik 已提交
1818 1819 1820
	mtd->writesize = DOC_LAYOUT_PAGE_SIZE;
	mtd->oobsize = DOC_LAYOUT_OOB_SIZE;
	mtd->owner = THIS_MODULE;
1821
	mtd->erase = doc_erase;
R
Robert Jarzmik 已提交
1822 1823 1824
	mtd->point = NULL;
	mtd->unpoint = NULL;
	mtd->read = doc_read;
1825
	mtd->write = doc_write;
R
Robert Jarzmik 已提交
1826
	mtd->read_oob = doc_read_oob;
1827
	mtd->write_oob = doc_write_oob;
R
Robert Jarzmik 已提交
1828 1829
	mtd->sync = NULL;
	mtd->block_isbad = doc_block_isbad;
1830
	mtd->ecclayout = &docg3_oobinfo;
R
Robert Jarzmik 已提交
1831 1832 1833
}

/**
1834 1835 1836 1837
 * doc_probe_device - Check if a device is available
 * @base: the io space where the device is probed
 * @floor: the floor of the probed device
 * @dev: the device
R
Robert Jarzmik 已提交
1838
 *
1839
 * Checks whether a device at the specified IO range, and floor is available.
R
Robert Jarzmik 已提交
1840
 *
1841 1842 1843
 * Returns a mtd_info struct if there is a device, ENODEV if none found, ENOMEM
 * if a memory allocation failed. If floor 0 is checked, a reset of the ASIC is
 * launched.
R
Robert Jarzmik 已提交
1844
 */
1845 1846
static struct mtd_info *doc_probe_device(void __iomem *base, int floor,
					 struct device *dev)
R
Robert Jarzmik 已提交
1847 1848 1849
{
	int ret, bbt_nbpages;
	u16 chip_id, chip_id_inv;
1850 1851
	struct docg3 *docg3;
	struct mtd_info *mtd;
R
Robert Jarzmik 已提交
1852 1853 1854 1855 1856 1857 1858 1859 1860

	ret = -ENOMEM;
	docg3 = kzalloc(sizeof(struct docg3), GFP_KERNEL);
	if (!docg3)
		goto nomem1;
	mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
	if (!mtd)
		goto nomem2;
	mtd->priv = docg3;
1861 1862 1863 1864 1865
	bbt_nbpages = DIV_ROUND_UP(docg3->max_block + 1,
				   8 * DOC_LAYOUT_PAGE_SIZE);
	docg3->bbt = kzalloc(bbt_nbpages * DOC_LAYOUT_PAGE_SIZE, GFP_KERNEL);
	if (!docg3->bbt)
		goto nomem3;
R
Robert Jarzmik 已提交
1866

1867 1868 1869
	docg3->dev = dev;
	docg3->device_id = floor;
	docg3->base = base;
R
Robert Jarzmik 已提交
1870
	doc_set_device_id(docg3, docg3->device_id);
1871 1872
	if (!floor)
		doc_set_asic_mode(docg3, DOC_ASICMODE_RESET);
R
Robert Jarzmik 已提交
1873 1874 1875 1876 1877
	doc_set_asic_mode(docg3, DOC_ASICMODE_NORMAL);

	chip_id = doc_register_readw(docg3, DOC_CHIPID);
	chip_id_inv = doc_register_readw(docg3, DOC_CHIPID_INV);

1878
	ret = 0;
R
Robert Jarzmik 已提交
1879
	if (chip_id != (u16)(~chip_id_inv)) {
1880
		goto nomem3;
R
Robert Jarzmik 已提交
1881 1882 1883 1884
	}

	switch (chip_id) {
	case DOC_CHIPID_G3:
1885 1886
		doc_info("Found a G3 DiskOnChip at addr %p, floor %d\n",
			 base, floor);
R
Robert Jarzmik 已提交
1887 1888 1889
		break;
	default:
		doc_err("Chip id %04x is not a DiskOnChip G3 chip\n", chip_id);
1890
		goto nomem3;
R
Robert Jarzmik 已提交
1891 1892 1893 1894
	}

	doc_set_driver_info(chip_id, mtd);

R
Robert Jarzmik 已提交
1895
	doc_hamming_ecc_init(docg3, DOC_LAYOUT_OOB_PAGEINFO_SZ);
R
Robert Jarzmik 已提交
1896
	doc_reload_bbt(docg3);
1897
	return mtd;
R
Robert Jarzmik 已提交
1898

1899
nomem3:
R
Robert Jarzmik 已提交
1900 1901 1902 1903
	kfree(mtd);
nomem2:
	kfree(docg3);
nomem1:
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921
	return ERR_PTR(ret);
}

/**
 * doc_release_device - Release a docg3 floor
 * @mtd: the device
 */
static void doc_release_device(struct mtd_info *mtd)
{
	struct docg3 *docg3 = mtd->priv;

	mtd_device_unregister(mtd);
	kfree(docg3->bbt);
	kfree(docg3);
	kfree(mtd->name);
	kfree(mtd);
}

1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
/**
 * docg3_resume - Awakens docg3 floor
 * @pdev: platfrom device
 *
 * Returns 0 (always successfull)
 */
static int docg3_resume(struct platform_device *pdev)
{
	int i;
	struct mtd_info **docg3_floors, *mtd;
	struct docg3 *docg3;

	docg3_floors = platform_get_drvdata(pdev);
	mtd = docg3_floors[0];
	docg3 = mtd->priv;

	doc_dbg("docg3_resume()\n");
	for (i = 0; i < 12; i++)
		doc_readb(docg3, DOC_IOSPACE_IPL);
	return 0;
}

/**
 * docg3_suspend - Put in low power mode the docg3 floor
 * @pdev: platform device
 * @state: power state
 *
 * Shuts off most of docg3 circuitery to lower power consumption.
 *
 * Returns 0 if suspend succeeded, -EIO if chip refused suspend
 */
static int docg3_suspend(struct platform_device *pdev, pm_message_t state)
{
	int floor, i;
	struct mtd_info **docg3_floors, *mtd;
	struct docg3 *docg3;
	u8 ctrl, pwr_down;

	docg3_floors = platform_get_drvdata(pdev);
	for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
		mtd = docg3_floors[floor];
		if (!mtd)
			continue;
		docg3 = mtd->priv;

		doc_writeb(docg3, floor, DOC_DEVICESELECT);
		ctrl = doc_register_readb(docg3, DOC_FLASHCONTROL);
		ctrl &= ~DOC_CTRL_VIOLATION & ~DOC_CTRL_CE;
		doc_writeb(docg3, ctrl, DOC_FLASHCONTROL);

		for (i = 0; i < 10; i++) {
			usleep_range(3000, 4000);
			pwr_down = doc_register_readb(docg3, DOC_POWERMODE);
			if (pwr_down & DOC_POWERDOWN_READY)
				break;
		}
		if (pwr_down & DOC_POWERDOWN_READY) {
			doc_dbg("docg3_suspend(): floor %d powerdown ok\n",
				floor);
		} else {
			doc_err("docg3_suspend(): floor %d powerdown failed\n",
				floor);
			return -EIO;
		}
	}

	mtd = docg3_floors[0];
	docg3 = mtd->priv;
	doc_set_asic_mode(docg3, DOC_ASICMODE_POWERDOWN);
	return 0;
}

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
/**
 * doc_probe - Probe the IO space for a DiskOnChip G3 chip
 * @pdev: platform device
 *
 * Probes for a G3 chip at the specified IO space in the platform data
 * ressources. The floor 0 must be available.
 *
 * Returns 0 on success, -ENOMEM, -ENXIO on error
 */
static int __init docg3_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct mtd_info *mtd;
	struct resource *ress;
	void __iomem *base;
	int ret, floor, found = 0;
	struct mtd_info **docg3_floors;

	ret = -ENXIO;
	ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!ress) {
		dev_err(dev, "No I/O memory resource defined\n");
		goto noress;
	}
	base = ioremap(ress->start, DOC_IOSPACE_SIZE);

	ret = -ENOMEM;
	docg3_floors = kzalloc(sizeof(*docg3_floors) * DOC_MAX_NBFLOORS,
			       GFP_KERNEL);
	if (!docg3_floors)
2024 2025 2026 2027 2028
		goto nomem1;
	docg3_bch = init_bch(DOC_ECC_BCH_M, DOC_ECC_BCH_T,
			     DOC_ECC_BCH_PRIMPOLY);
	if (!docg3_bch)
		goto nomem2;
2029 2030 2031

	for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++) {
		mtd = doc_probe_device(base, floor, dev);
2032
		if (IS_ERR(mtd)) {
2033
			ret = PTR_ERR(mtd);
2034 2035 2036 2037 2038 2039 2040 2041
			goto err_probe;
		}
		if (!mtd) {
			if (floor == 0)
				goto notfound;
			else
				continue;
		}
2042
		docg3_floors[floor] = mtd;
2043 2044
		ret = mtd_device_parse_register(mtd, part_probes, NULL, NULL,
						0);
2045 2046
		if (ret)
			goto err_probe;
2047
		found++;
2048 2049
	}

2050 2051 2052
	ret = doc_register_sysfs(pdev, docg3_floors);
	if (ret)
		goto err_probe;
2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063
	if (!found)
		goto notfound;

	platform_set_drvdata(pdev, docg3_floors);
	doc_dbg_register(docg3_floors[0]->priv);
	return 0;

notfound:
	ret = -ENODEV;
	dev_info(dev, "No supported DiskOnChip found\n");
err_probe:
2064
	free_bch(docg3_bch);
2065 2066 2067
	for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
		if (docg3_floors[floor])
			doc_release_device(docg3_floors[floor]);
2068 2069 2070
nomem2:
	kfree(docg3_floors);
nomem1:
2071 2072
	iounmap(base);
noress:
R
Robert Jarzmik 已提交
2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
	return ret;
}

/**
 * docg3_release - Release the driver
 * @pdev: the platform device
 *
 * Returns 0
 */
static int __exit docg3_release(struct platform_device *pdev)
{
2084 2085 2086 2087
	struct mtd_info **docg3_floors = platform_get_drvdata(pdev);
	struct docg3 *docg3 = docg3_floors[0]->priv;
	void __iomem *base = docg3->base;
	int floor;
R
Robert Jarzmik 已提交
2088

2089
	doc_unregister_sysfs(pdev, docg3_floors);
R
Robert Jarzmik 已提交
2090
	doc_dbg_unregister(docg3);
2091 2092 2093 2094 2095
	for (floor = 0; floor < DOC_MAX_NBFLOORS; floor++)
		if (docg3_floors[floor])
			doc_release_device(docg3_floors[floor]);

	kfree(docg3_floors);
2096
	free_bch(docg3_bch);
2097
	iounmap(base);
R
Robert Jarzmik 已提交
2098 2099 2100 2101 2102 2103 2104 2105
	return 0;
}

static struct platform_driver g3_driver = {
	.driver		= {
		.name	= "docg3",
		.owner	= THIS_MODULE,
	},
2106 2107
	.suspend	= docg3_suspend,
	.resume		= docg3_resume,
R
Robert Jarzmik 已提交
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
	.remove		= __exit_p(docg3_release),
};

static int __init docg3_init(void)
{
	return platform_driver_probe(&g3_driver, docg3_probe);
}
module_init(docg3_init);


static void __exit docg3_exit(void)
{
	platform_driver_unregister(&g3_driver);
}
module_exit(docg3_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");
MODULE_DESCRIPTION("MTD driver for DiskOnChip G3");