3 * MTD driver for the 28F160F3 Flash Memory (non-CFI) on LART.
7 * Copyright (c) 2001, 2d3D, Inc.
9 * This code is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 * [1] 3 Volt Fast Boot Block Flash Memory" Intel Datasheet
16 * - Order Number: 290644-005
19 * [2] MTD internal API documentation
20 * - http://www.linux-mtd.infradead.org/
24 * Even though this driver is written for 3 Volt Fast Boot
25 * Block Flash Memory, it is rather specific to LART. With
26 * Minor modifications, notably the without data/address line
27 * mangling and different bus settings, etc. it should be
28 * trivial to adapt to other platforms.
30 * If somebody would sponsor me a different board, I'll
37 #include <linux/kernel.h>
38 #include <linux/module.h>
39 #include <linux/types.h>
40 #include <linux/init.h>
41 #include <linux/errno.h>
42 #include <linux/string.h>
43 #include <linux/mtd/mtd.h>
44 #include <linux/mtd/partitions.h>
46 #ifndef CONFIG_SA1100_LART
47 #error This is for LART architecture only
50 static char module_name[] = "lart";
53 * These values is specific to 28Fxxxx3 flash memory.
54 * See section 2.3.1 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
56 #define FLASH_BLOCKSIZE_PARAM (4096 * BUSWIDTH)
57 #define FLASH_NUMBLOCKS_16m_PARAM 8
58 #define FLASH_NUMBLOCKS_8m_PARAM 8
61 * These values is specific to 28Fxxxx3 flash memory.
62 * See section 2.3.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
64 #define FLASH_BLOCKSIZE_MAIN (32768 * BUSWIDTH)
65 #define FLASH_NUMBLOCKS_16m_MAIN 31
66 #define FLASH_NUMBLOCKS_8m_MAIN 15
69 * These values are specific to LART
73 #define BUSWIDTH 4 /* don't change this - a lot of the code _will_ break if you change this */
74 #define FLASH_OFFSET 0xe8000000 /* see linux/arch/arm/mach-sa1100/lart.c */
77 #define NUM_BLOB_BLOCKS FLASH_NUMBLOCKS_16m_PARAM
78 #define BLOB_START 0x00000000
79 #define BLOB_LEN (NUM_BLOB_BLOCKS * FLASH_BLOCKSIZE_PARAM)
82 #define NUM_KERNEL_BLOCKS 7
83 #define KERNEL_START (BLOB_START + BLOB_LEN)
84 #define KERNEL_LEN (NUM_KERNEL_BLOCKS * FLASH_BLOCKSIZE_MAIN)
87 #define NUM_INITRD_BLOCKS 24
88 #define INITRD_START (KERNEL_START + KERNEL_LEN)
89 #define INITRD_LEN (NUM_INITRD_BLOCKS * FLASH_BLOCKSIZE_MAIN)
92 * See section 4.0 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
94 #define READ_ARRAY 0x00FF00FF /* Read Array/Reset */
95 #define READ_ID_CODES 0x00900090 /* Read Identifier Codes */
96 #define ERASE_SETUP 0x00200020 /* Block Erase */
97 #define ERASE_CONFIRM 0x00D000D0 /* Block Erase and Program Resume */
98 #define PGM_SETUP 0x00400040 /* Program */
99 #define STATUS_READ 0x00700070 /* Read Status Register */
100 #define STATUS_CLEAR 0x00500050 /* Clear Status Register */
101 #define STATUS_BUSY 0x00800080 /* Write State Machine Status (WSMS) */
102 #define STATUS_ERASE_ERR 0x00200020 /* Erase Status (ES) */
103 #define STATUS_PGM_ERR 0x00100010 /* Program Status (PS) */
106 * See section 4.2 in "3 Volt Fast Boot Block Flash Memory" Intel Datasheet
108 #define FLASH_MANUFACTURER 0x00890089
109 #define FLASH_DEVICE_8mbit_TOP 0x88f188f1
110 #define FLASH_DEVICE_8mbit_BOTTOM 0x88f288f2
111 #define FLASH_DEVICE_16mbit_TOP 0x88f388f3
112 #define FLASH_DEVICE_16mbit_BOTTOM 0x88f488f4
114 /***************************************************************************************************/
117 * The data line mapping on LART is as follows:
120 * -------------------
139 /* Mangle data (x) */
140 #define DATA_TO_FLASH(x) \
142 (((x) & 0x08009000) >> 11) + \
143 (((x) & 0x00002000) >> 10) + \
144 (((x) & 0x04004000) >> 8) + \
145 (((x) & 0x00000010) >> 4) + \
146 (((x) & 0x91000820) >> 3) + \
147 (((x) & 0x22080080) >> 2) + \
148 ((x) & 0x40000400) + \
149 (((x) & 0x00040040) << 1) + \
150 (((x) & 0x00110000) << 4) + \
151 (((x) & 0x00220100) << 5) + \
152 (((x) & 0x00800208) << 6) + \
153 (((x) & 0x00400004) << 9) + \
154 (((x) & 0x00000001) << 12) + \
155 (((x) & 0x00000002) << 13) \
158 /* Unmangle data (x) */
159 #define FLASH_TO_DATA(x) \
161 (((x) & 0x00010012) << 11) + \
162 (((x) & 0x00000008) << 10) + \
163 (((x) & 0x00040040) << 8) + \
164 (((x) & 0x00000001) << 4) + \
165 (((x) & 0x12200104) << 3) + \
166 (((x) & 0x08820020) << 2) + \
167 ((x) & 0x40000400) + \
168 (((x) & 0x00080080) >> 1) + \
169 (((x) & 0x01100000) >> 4) + \
170 (((x) & 0x04402000) >> 5) + \
171 (((x) & 0x20008200) >> 6) + \
172 (((x) & 0x80000800) >> 9) + \
173 (((x) & 0x00001000) >> 12) + \
174 (((x) & 0x00004000) >> 13) \
178 * The address line mapping on LART is as follows:
181 * -------------------
195 * BOOT BLOCK BOUNDARY
201 * MAIN BLOCK BOUNDARY
209 * As we can see from above, the addresses aren't mangled across
210 * block boundaries, so we don't need to worry about address
211 * translations except for sending/reading commands during
215 /* Mangle address (x) on chip U2 */
216 #define ADDR_TO_FLASH_U2(x) \
218 (((x) & 0x00000f00) >> 4) + \
219 (((x) & 0x00042000) << 1) + \
220 (((x) & 0x0009c003) << 2) + \
221 (((x) & 0x00021080) << 3) + \
222 (((x) & 0x00000010) << 4) + \
223 (((x) & 0x00000040) << 5) + \
224 (((x) & 0x00000024) << 7) + \
225 (((x) & 0x00000008) << 10) \
228 /* Unmangle address (x) on chip U2 */
229 #define FLASH_U2_TO_ADDR(x) \
231 (((x) << 4) & 0x00000f00) + \
232 (((x) >> 1) & 0x00042000) + \
233 (((x) >> 2) & 0x0009c003) + \
234 (((x) >> 3) & 0x00021080) + \
235 (((x) >> 4) & 0x00000010) + \
236 (((x) >> 5) & 0x00000040) + \
237 (((x) >> 7) & 0x00000024) + \
238 (((x) >> 10) & 0x00000008) \
241 /* Mangle address (x) on chip U3 */
242 #define ADDR_TO_FLASH_U3(x) \
244 (((x) & 0x00000080) >> 3) + \
245 (((x) & 0x00000040) >> 1) + \
246 (((x) & 0x00052020) << 1) + \
247 (((x) & 0x00084f03) << 2) + \
248 (((x) & 0x00029010) << 3) + \
249 (((x) & 0x00000008) << 5) + \
250 (((x) & 0x00000004) << 7) \
253 /* Unmangle address (x) on chip U3 */
254 #define FLASH_U3_TO_ADDR(x) \
256 (((x) << 3) & 0x00000080) + \
257 (((x) << 1) & 0x00000040) + \
258 (((x) >> 1) & 0x00052020) + \
259 (((x) >> 2) & 0x00084f03) + \
260 (((x) >> 3) & 0x00029010) + \
261 (((x) >> 5) & 0x00000008) + \
262 (((x) >> 7) & 0x00000004) \
265 /***************************************************************************************************/
267 static __u8 read8 (__u32 offset)
269 volatile __u8 *data = (__u8 *) (FLASH_OFFSET + offset);
271 printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.2x\n", __func__, offset, *data);
276 static __u32 read32 (__u32 offset)
278 volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);
280 printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.8x\n", __func__, offset, *data);
285 static void write32 (__u32 x,__u32 offset)
287 volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);
290 printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, *data);
294 /***************************************************************************************************/
297 * Probe for 16mbit flash memory on a LART board without doing
298 * too much damage. Since we need to write 1 dword to memory,
299 * we're f**cked if this happens to be DRAM since we can't
300 * restore the memory (otherwise we might exit Read Array mode).
302 * Returns 1 if we found 16mbit flash memory on LART, 0 otherwise.
304 static int flash_probe (void)
306 __u32 manufacturer,devtype;
308 /* setup "Read Identifier Codes" mode */
309 write32 (DATA_TO_FLASH (READ_ID_CODES),0x00000000);
311 /* probe U2. U2/U3 returns the same data since the first 3
312 * address lines is mangled in the same way */
313 manufacturer = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000000)));
314 devtype = FLASH_TO_DATA (read32 (ADDR_TO_FLASH_U2 (0x00000001)));
316 /* put the flash back into command mode */
317 write32 (DATA_TO_FLASH (READ_ARRAY),0x00000000);
319 return (manufacturer == FLASH_MANUFACTURER && (devtype == FLASH_DEVICE_16mbit_TOP || devtype == FLASH_DEVICE_16mbit_BOTTOM));
323 * Erase one block of flash memory at offset ``offset'' which is any
324 * address within the block which should be erased.
326 * Returns 1 if successful, 0 otherwise.
328 static inline int erase_block (__u32 offset)
333 printk (KERN_DEBUG "%s(): 0x%.8x\n", __func__, offset);
336 /* erase and confirm */
337 write32 (DATA_TO_FLASH (ERASE_SETUP),offset);
338 write32 (DATA_TO_FLASH (ERASE_CONFIRM),offset);
340 /* wait for block erase to finish */
343 write32 (DATA_TO_FLASH (STATUS_READ),offset);
344 status = FLASH_TO_DATA (read32 (offset));
346 while ((~status & STATUS_BUSY) != 0);
348 /* put the flash back into command mode */
349 write32 (DATA_TO_FLASH (READ_ARRAY),offset);
351 /* was the erase successful? */
352 if ((status & STATUS_ERASE_ERR))
354 printk (KERN_WARNING "%s: erase error at address 0x%.8x.\n",module_name,offset);
361 static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
367 printk (KERN_DEBUG "%s(addr = 0x%.8x, len = %d)\n", __func__, instr->addr, instr->len);
371 * check that both start and end of the requested erase are
372 * aligned with the erasesize at the appropriate addresses.
374 * skip all erase regions which are ended before the start of
375 * the requested erase. Actually, to save on the calculations,
376 * we skip to the first erase region which starts after the
377 * start of the requested erase, and then go back one.
379 for (i = 0; i < mtd->numeraseregions && instr->addr >= mtd->eraseregions[i].offset; i++) ;
383 * ok, now i is pointing at the erase region in which this
384 * erase request starts. Check the start of the requested
385 * erase range is aligned with the erase size which is in
388 if (i < 0 || (instr->addr & (mtd->eraseregions[i].erasesize - 1)))
391 /* Remember the erase region we start on */
395 * next, check that the end of the requested erase is aligned
396 * with the erase region at that address.
398 * as before, drop back one to point at the region in which
399 * the address actually falls
401 for (; i < mtd->numeraseregions && instr->addr + instr->len >= mtd->eraseregions[i].offset; i++) ;
404 /* is the end aligned on a block boundary? */
405 if (i < 0 || ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)))
413 /* now erase those blocks */
416 if (!erase_block (addr))
418 instr->state = MTD_ERASE_FAILED;
422 addr += mtd->eraseregions[i].erasesize;
423 len -= mtd->eraseregions[i].erasesize;
425 if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].numblocks)) i++;
428 instr->state = MTD_ERASE_DONE;
429 mtd_erase_callback(instr);
434 static int flash_read (struct mtd_info *mtd,loff_t from,size_t len,size_t *retlen,u_char *buf)
437 printk (KERN_DEBUG "%s(from = 0x%.8x, len = %d)\n", __func__, (__u32)from, len);
440 /* we always read len bytes */
443 /* first, we read bytes until we reach a dword boundary */
444 if (from & (BUSWIDTH - 1))
446 int gap = BUSWIDTH - (from & (BUSWIDTH - 1));
448 while (len && gap--) *buf++ = read8 (from++), len--;
451 /* now we read dwords until we reach a non-dword boundary */
452 while (len >= BUSWIDTH)
454 *((__u32 *) buf) = read32 (from);
461 /* top up the last unaligned bytes */
462 if (len & (BUSWIDTH - 1))
463 while (len--) *buf++ = read8 (from++);
469 * Write one dword ``x'' to flash memory at offset ``offset''. ``offset''
470 * must be 32 bits, i.e. it must be on a dword boundary.
472 * Returns 1 if successful, 0 otherwise.
474 static inline int write_dword (__u32 offset,__u32 x)
479 printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, x);
483 write32 (DATA_TO_FLASH (PGM_SETUP),offset);
488 /* wait for the write to finish */
491 write32 (DATA_TO_FLASH (STATUS_READ),offset);
492 status = FLASH_TO_DATA (read32 (offset));
494 while ((~status & STATUS_BUSY) != 0);
496 /* put the flash back into command mode */
497 write32 (DATA_TO_FLASH (READ_ARRAY),offset);
499 /* was the write successful? */
500 if ((status & STATUS_PGM_ERR) || read32 (offset) != x)
502 printk (KERN_WARNING "%s: write error at address 0x%.8x.\n",module_name,offset);
509 static int flash_write (struct mtd_info *mtd,loff_t to,size_t len,size_t *retlen,const u_char *buf)
515 printk (KERN_DEBUG "%s(to = 0x%.8x, len = %d)\n", __func__, (__u32)to, len);
519 if (!len) return (0);
521 /* first, we write a 0xFF.... padded byte until we reach a dword boundary */
522 if (to & (BUSWIDTH - 1))
524 __u32 aligned = to & ~(BUSWIDTH - 1);
525 int gap = to - aligned;
529 while (gap--) tmp[i++] = 0xFF;
530 while (len && i < BUSWIDTH) tmp[i++] = buf[n++], len--;
531 while (i < BUSWIDTH) tmp[i++] = 0xFF;
533 if (!write_dword (aligned,*((__u32 *) tmp))) return (-EIO);
540 /* now we write dwords until we reach a non-dword boundary */
541 while (len >= BUSWIDTH)
543 if (!write_dword (to,*((__u32 *) buf))) return (-EIO);
551 /* top up the last unaligned bytes, padded with 0xFF.... */
552 if (len & (BUSWIDTH - 1))
556 while (len--) tmp[i++] = buf[n++];
557 while (i < BUSWIDTH) tmp[i++] = 0xFF;
559 if (!write_dword (to,*((__u32 *) tmp))) return (-EIO);
567 /***************************************************************************************************/
569 static struct mtd_info mtd;
571 static struct mtd_erase_region_info erase_regions[] = {
572 /* parameter blocks */
574 .offset = 0x00000000,
575 .erasesize = FLASH_BLOCKSIZE_PARAM,
576 .numblocks = FLASH_NUMBLOCKS_16m_PARAM,
580 .offset = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM,
581 .erasesize = FLASH_BLOCKSIZE_MAIN,
582 .numblocks = FLASH_NUMBLOCKS_16m_MAIN,
586 static struct mtd_partition lart_partitions[] = {
590 .offset = BLOB_START,
596 .offset = KERNEL_START, /* MTDPART_OFS_APPEND */
599 /* initial ramdisk / file system */
601 .name = "file system",
602 .offset = INITRD_START, /* MTDPART_OFS_APPEND */
603 .size = INITRD_LEN, /* MTDPART_SIZ_FULL */
606 #define NUM_PARTITIONS ARRAY_SIZE(lart_partitions)
608 static int __init lart_flash_init (void)
611 memset (&mtd,0,sizeof (mtd));
613 printk ("%s: Probing for 28F160x3 flash on LART...\n",module_name);
616 printk (KERN_WARNING "%s: Found no LART compatible flash device\n",module_name);
619 printk ("%s: This looks like a LART board to me.\n",module_name);
620 mtd.name = module_name;
621 mtd.type = MTD_NORFLASH;
623 mtd.writebufsize = 4;
624 mtd.flags = MTD_CAP_NORFLASH;
625 mtd.size = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM + FLASH_BLOCKSIZE_MAIN * FLASH_NUMBLOCKS_16m_MAIN;
626 mtd.erasesize = FLASH_BLOCKSIZE_MAIN;
627 mtd.numeraseregions = ARRAY_SIZE(erase_regions);
628 mtd.eraseregions = erase_regions;
629 mtd._erase = flash_erase;
630 mtd._read = flash_read;
631 mtd._write = flash_write;
632 mtd.owner = THIS_MODULE;
637 "mtd.size = 0x%.8x (%uM)\n"
638 "mtd.erasesize = 0x%.8x (%uK)\n"
639 "mtd.numeraseregions = %d\n",
641 mtd.size,mtd.size / (1024*1024),
642 mtd.erasesize,mtd.erasesize / 1024,
643 mtd.numeraseregions);
645 if (mtd.numeraseregions)
646 for (result = 0; result < mtd.numeraseregions; result++)
649 "mtd.eraseregions[%d].offset = 0x%.8x\n"
650 "mtd.eraseregions[%d].erasesize = 0x%.8x (%uK)\n"
651 "mtd.eraseregions[%d].numblocks = %d\n",
652 result,mtd.eraseregions[result].offset,
653 result,mtd.eraseregions[result].erasesize,mtd.eraseregions[result].erasesize / 1024,
654 result,mtd.eraseregions[result].numblocks);
656 printk ("\npartitions = %d\n", ARRAY_SIZE(lart_partitions));
658 for (result = 0; result < ARRAY_SIZE(lart_partitions); result++)
661 "lart_partitions[%d].name = %s\n"
662 "lart_partitions[%d].offset = 0x%.8x\n"
663 "lart_partitions[%d].size = 0x%.8x (%uK)\n",
664 result,lart_partitions[result].name,
665 result,lart_partitions[result].offset,
666 result,lart_partitions[result].size,lart_partitions[result].size / 1024);
669 result = mtd_device_register(&mtd, lart_partitions,
670 ARRAY_SIZE(lart_partitions));
675 static void __exit lart_flash_exit (void)
677 mtd_device_unregister(&mtd);
680 module_init (lart_flash_init);
681 module_exit (lart_flash_exit);
683 MODULE_LICENSE("GPL");
685 MODULE_DESCRIPTION("MTD driver for Intel 28F160F3 on LART board");