3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * flash_real_protect() routine based on boards/alaska/flash.c
7 * Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
30 /* Intel-compatible flash commands */
31 #define INTEL_ERASE 0x20
32 #define INTEL_PROGRAM 0x40
33 #define INTEL_CLEAR 0x50
34 #define INTEL_LOCKBIT 0x60
35 #define INTEL_PROTECT 0x01
36 #define INTEL_STATUS 0x70
37 #define INTEL_READID 0x90
38 #define INTEL_READID 0x90
39 #define INTEL_SUSPEND 0xB0
40 #define INTEL_CONFIRM 0xD0
41 #define INTEL_RESET 0xFF
43 /* Intel-compatible flash status bits */
44 #define INTEL_FINISHED 0x80
47 typedef unsigned char FLASH_PORT_WIDTH;
48 typedef volatile unsigned char FLASH_PORT_WIDTHV;
49 #define FPW FLASH_PORT_WIDTH
50 #define FPWV FLASH_PORT_WIDTHV
51 #define FLASH_ID_MASK 0xFF
53 #define ORMASK(size) ((-size) & OR_AM_MSK)
55 #define FLASH_CYCLE1 0x0555
56 #define FLASH_CYCLE2 0x02aa
58 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS]; /* info for FLASH chips */
60 /*-----------------------------------------------------------------------
63 static ulong flash_get_size(FPWV *addr, flash_info_t *info);
64 static void flash_reset(flash_info_t *info);
65 static flash_info_t *flash_get_info(ulong base);
66 static int write_data (flash_info_t *info, FPWV *dest, FPW data); /* O2D */
67 static void flash_sync_real_protect (flash_info_t * info);
68 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);
70 /*-----------------------------------------------------------------------
73 * sets up flash_info and returns size of FLASH (bytes)
75 unsigned long flash_init (void)
77 unsigned long size = 0;
79 extern void flash_preinit(void);
80 extern void flash_afterinit(ulong);
84 /* Init: no FLASHes known */
85 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
86 memset(&flash_info[i], 0, sizeof(flash_info_t));
87 flash_info[i].flash_id = FLASH_UNKNOWN;
90 /* Query flash chip */
92 flash_get_size((FPW *)CONFIG_SYS_FLASH_BASE, &flash_info[0]);
93 size += flash_info[0].size;
95 /* get the h/w and s/w protection status in sync */
96 flash_sync_real_protect(&flash_info[0]);
98 #if CONFIG_SYS_MONITOR_BASE >= CONFIG_SYS_FLASH_BASE
99 /* monitor protection ON by default */
100 flash_protect(FLAG_PROTECT_SET,
101 CONFIG_SYS_MONITOR_BASE,
102 CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
103 flash_get_info(CONFIG_SYS_MONITOR_BASE));
106 #ifdef CONFIG_ENV_IS_IN_FLASH
107 /* ENV protection ON by default */
108 flash_protect(FLAG_PROTECT_SET,
110 CONFIG_ENV_ADDR+CONFIG_ENV_SIZE-1,
111 flash_get_info(CONFIG_ENV_ADDR));
115 flash_afterinit(size);
116 return (size ? size : 1);
119 /*-----------------------------------------------------------------------
121 static void flash_reset(flash_info_t *info)
123 FPWV *base = (FPWV *)(info->start[0]);
125 /* Put FLASH back in read mode */
126 if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL)
127 *base = (FPW) INTEL_RESET; /* Intel Read Mode */
130 /*-----------------------------------------------------------------------
133 static flash_info_t *flash_get_info(ulong base)
138 for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i ++) {
139 info = & flash_info[i];
141 info->start[0] <= base &&
142 base <= info->start[0] + info->size - 1)
146 return (i == CONFIG_SYS_MAX_FLASH_BANKS ? 0 : info);
149 /*-----------------------------------------------------------------------
152 void flash_print_info (flash_info_t *info)
158 uchar botbootletter[] = "B";
159 uchar topbootletter[] = "T";
160 uchar botboottype[] = "bottom boot sector";
161 uchar topboottype[] = "top boot sector";
163 if (info->flash_id == FLASH_UNKNOWN) {
164 printf ("missing or unknown FLASH type\n");
168 switch (info->flash_id & FLASH_VENDMASK) {
169 case FLASH_MAN_INTEL:
173 printf ("Unknown Vendor ");
177 /* check for top or bottom boot, if it applies */
178 if (info->flash_id & FLASH_BTYPE) {
179 boottype = botboottype;
180 bootletter = botbootletter;
182 boottype = topboottype;
183 bootletter = topbootletter;
186 switch (info->flash_id & FLASH_TYPEMASK) {
187 case FLASH_28F128J3A:
188 fmt = "28F128J3 (128 Mbit, uniform sectors)\n";
191 fmt = "Unknown Chip Type\n";
195 printf (fmt, bootletter, boottype);
196 printf (" Size: %ld MB in %d Sectors\n",
200 printf (" Sector Start Addresses:");
201 for (i=0; i<info->sector_count; ++i) {
205 printf (" %08lX%s", info->start[i],
206 info->protect[i] ? " (RO)" : " ");
211 /*-----------------------------------------------------------------------
215 * The following code cannot be run from FLASH!
217 ulong flash_get_size (FPWV *addr, flash_info_t *info)
221 /* Write auto select command: read Manufacturer ID */
222 /* Write auto select command sequence and test FLASH answer */
223 addr[FLASH_CYCLE1] = (FPW) INTEL_READID; /* selects Intel or AMD */
225 /* The manufacturer codes are only 1 byte, so just use 1 byte.
226 * This works for any bus width and any FLASH device width.
229 switch (addr[0] & 0xff) {
230 case (uchar)INTEL_MANUFACT:
231 info->flash_id = FLASH_MAN_INTEL;
234 info->flash_id = FLASH_UNKNOWN;
235 info->sector_count = 0;
240 /* Strataflash is configurable to 8/16bit Bus,
241 * but the Query-Structure is Word-orientated */
242 if (info->flash_id != FLASH_UNKNOWN) {
243 switch ((FPW)addr[2]) {
244 case (FPW)INTEL_ID_28F128J3:
245 info->flash_id += FLASH_28F128J3A;
246 info->sector_count = 128;
247 info->size = 0x01000000;
248 for( i = 0; i < info->sector_count; i++ )
249 info->start[i] = (ulong)addr + (i * 0x20000);
250 break; /* => Intel Strataflash 16MB */
252 printf("Flash_id != %xd\n", (FPW)addr[2]);
253 info->flash_id = FLASH_UNKNOWN;
254 info->sector_count = 0;
256 return (0); /* => no or unknown flash */
260 /* Put FLASH back in read mode */
266 /*-----------------------------------------------------------------------
269 int flash_erase (flash_info_t *info, int s_first, int s_last)
272 int flag, prot, sect;
273 ulong start, now, last;
276 if ((s_first < 0) || (s_first > s_last)) {
277 if (info->flash_id == FLASH_UNKNOWN) {
278 printf ("- missing\n");
280 printf ("- no sectors to erase\n");
285 switch (info->flash_id & FLASH_TYPEMASK) {
286 case FLASH_28F128J3A:
290 printf ("Can't erase unknown flash type %08lx - aborted\n",
296 for (sect = s_first; sect <= s_last; ++sect)
297 if (info->protect[sect])
301 printf ("- Warning: %d protected sectors will not be erased!",
307 /* Start erase on unprotected sectors */
308 for (sect = s_first; sect <= s_last && rcode == 0; sect++) {
310 if (info->protect[sect] != 0) /* protected, skip it */
313 /* Disable interrupts which might cause a timeout here */
314 flag = disable_interrupts();
316 addr = (FPWV *)(info->start[sect]);
317 *addr = (FPW) INTEL_CLEAR; /* clear status register */
318 *addr = (FPW) INTEL_ERASE; /* erase setup */
319 *addr = (FPW) INTEL_CONFIRM; /* erase confirm */
321 /* re-enable interrupts if necessary */
325 start = get_timer(0);
327 /* wait at least 80us for Intel - let's wait 1 ms */
330 while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
331 if ((now = get_timer(start)) > CONFIG_SYS_FLASH_ERASE_TOUT) {
332 printf ("Timeout\n");
333 *addr = (FPW) INTEL_SUSPEND;/* suspend erase */
334 flash_reset(info); /* reset to read mode */
335 rcode = 1; /* failed */
339 /* show that we're waiting */
340 if ((get_timer(last)) > CONFIG_SYS_HZ) { /* every second */
346 flash_reset(info); /* reset to read mode */
353 /*-----------------------------------------------------------------------
354 * Copy memory to flash, returns:
357 * 2 - Flash not erased
359 int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
361 FPW data = 0; /* 16 or 32 bit word, matches flash bus width on MPC8XX */
362 int bytes; /* number of bytes to program in current word */
363 int left; /* number of bytes left to program */
366 for (left = cnt, res = 0;
367 left > 0 && res == 0;
368 addr += sizeof(data), left -= sizeof(data) - bytes) {
370 bytes = addr & (sizeof(data) - 1);
371 addr &= ~(sizeof(data) - 1);
373 /* combine source and destination data so can program
374 * an entire word of 16 or 32 bits */
375 for (i = 0; i < sizeof(data); i++) {
377 if (i < bytes || i - bytes >= left )
378 data += *((uchar *)addr + i);
383 /* write one word to the flash */
384 switch (info->flash_id & FLASH_VENDMASK) {
385 case FLASH_MAN_INTEL:
386 res = write_data(info, (FPWV *)addr, data);
389 /* unknown flash type, error! */
390 printf ("missing or unknown FLASH type\n");
391 res = 1; /* not really a timeout, but gives error */
399 /*-----------------------------------------------------------------------
400 * Write a word or halfword to Flash, returns:
403 * 2 - Flash not erased
405 static int write_data (flash_info_t *info, FPWV *dest, FPW data)
412 /* Check if Flash is (sufficiently) erased */
413 if ((*addr & data) != data) {
414 printf ("not erased at %08lx (%x)\n", (ulong) addr, *addr);
417 /* Disable interrupts which might cause a timeout here */
418 flag = disable_interrupts ();
420 *addr = (FPW) INTEL_PROGRAM; /* write setup */
423 /* arm simple, non interrupt dependent timer */
424 start = get_timer(0);
426 /* wait while polling the status register */
427 while (((status = *addr) & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
428 if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
429 *addr = (FPW) INTEL_RESET; /* restore read mode */
434 *addr = (FPW) INTEL_RESET; /* restore read mode */
442 /*-----------------------------------------------------------------------
443 * Set/Clear sector's lock bit, returns:
445 * 1 - Error (timeout, voltage problems, etc.)
447 int flash_real_protect (flash_info_t * info, long sector, int prot)
452 FPWV *addr = (FPWV *) (info->start[sector]);
453 int flag = disable_interrupts ();
455 *addr = INTEL_CLEAR; /* Clear status register */
456 if (prot) { /* Set sector lock bit */
457 *addr = INTEL_LOCKBIT; /* Sector lock bit */
458 *addr = INTEL_PROTECT; /* set */
459 } else { /* Clear sector lock bit */
460 *addr = INTEL_LOCKBIT; /* All sectors lock bits */
461 *addr = INTEL_CONFIRM; /* clear */
464 start = get_timer (0);
466 while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
467 if (get_timer (start) > CONFIG_SYS_FLASH_UNLOCK_TOUT) {
468 printf ("Flash lock bit operation timed out\n");
474 if (*addr != INTEL_OK) {
475 printf ("Flash lock bit operation failed at %08X, CSR=%08X\n",
476 (uint) addr, (uint) * addr);
481 info->protect[sector] = prot;
484 * Clear lock bit command clears all sectors lock bits, so
485 * we have to restore lock bits of protected sectors.
488 for (i = 0; i < info->sector_count; i++) {
489 if (info->protect[i]) {
490 start = get_timer (0);
491 addr = (FPWV *) (info->start[i]);
492 *addr = INTEL_LOCKBIT; /* Sector lock bit */
493 *addr = INTEL_PROTECT; /* set */
494 while ((*addr & INTEL_FINISHED) !=
496 if (get_timer (start) >
497 CONFIG_SYS_FLASH_UNLOCK_TOUT) {
498 printf ("Flash lock bit operation timed out\n");
508 enable_interrupts ();
510 *addr = INTEL_RESET; /* Reset to read array mode */
517 * This function gets the u-boot flash sector protection status
518 * (flash_info_t.protect[]) in sync with the sector protection
519 * status stored in hardware.
521 static void flash_sync_real_protect (flash_info_t * info)
524 switch (info->flash_id & FLASH_TYPEMASK) {
525 case FLASH_28F128J3A:
526 for (i = 0; i < info->sector_count; ++i) {
527 info->protect[i] = intel_sector_protected(info, i);
531 /* no h/w protect support */
538 * checks if "sector" in bank "info" is protected. Should work on intel
539 * strata flash chips 28FxxxJ3x in 8-bit mode.
540 * Returns 1 if sector is protected (or timed-out while trying to read
541 * protection status), 0 if it is not.
543 static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
546 FPWV *lock_conf_addr;
551 * first, wait for the WSM to be finished. The rationale for
552 * waiting for the WSM to become idle for at most
553 * CONFIG_SYS_FLASH_ERASE_TOUT is as follows. The WSM can be busy
554 * because of: (1) erase, (2) program or (3) lock bit
555 * configuration. So we just wait for the longest timeout of
556 * the (1)-(3), i.e. the erase timeout.
559 /* wait at least 35ns (W12) before issuing Read Status Register */
561 addr = (FPWV *) info->start[sector];
562 *addr = (FPW) INTEL_STATUS;
564 start = get_timer (0);
565 while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
566 if (get_timer (start) > CONFIG_SYS_FLASH_ERASE_TOUT) {
567 *addr = (FPW) INTEL_RESET; /* restore read mode */
568 printf("WSM busy too long, can't get prot status\n");
573 /* issue the Read Identifier Codes command */
574 *addr = (FPW) INTEL_READID;
576 /* wait at least 35ns (W12) before reading */
579 /* Intel example code uses offset of 4 for 8-bit flash */
580 lock_conf_addr = (FPWV *) info->start[sector] + 4;
581 ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;
583 /* put flash back in read mode */
584 *addr = (FPW) INTEL_RESET;