2 * CFI parallel flash with Intel command set emulation
4 * Copyright (c) 2006 Thorsten Zitterell
5 * Copyright (c) 2005 Jocelyn Mayer
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
24 * Supported commands/modes are:
31 * It does not support timings
32 * It does not support flash interleaving
33 * It does not implement software data protection as found in many real chips
34 * It does not implement erase suspend/resume commands
35 * It does not implement multiple sectors erase
37 * It does not implement much more ...
42 #define PFLASH_BUG(fmt, args...) \
44 printf("PFLASH: Possible BUG - " fmt, ##args); \
48 /* #define PFLASH_DEBUG */
50 #define DPRINTF(fmt, args...) \
52 printf("PFLASH: " fmt , ##args); \
55 #define DPRINTF(fmt, args...) do { } while (0)
61 target_ulong sector_len;
62 target_ulong total_len;
64 int wcycle; /* if 0, the flash is read normally */
71 uint8_t cfi_table[0x52];
79 static void pflash_timer (void *opaque)
81 pflash_t *pfl = opaque;
83 DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
89 cpu_register_physical_memory(pfl->base, pfl->total_len,
90 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
96 static uint32_t pflash_read (pflash_t *pfl, target_ulong offset, int width)
104 boff = offset & 0xFF; /* why this here ?? */
108 else if (pfl->width == 4)
111 DPRINTF("%s: reading offset %08x under cmd %02x\n",
112 __func__, boff, pfl->cmd);
116 /* Flash area read */
121 DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
124 #if defined(TARGET_WORDS_BIGENDIAN)
125 ret = p[offset] << 8;
126 ret |= p[offset + 1];
129 ret |= p[offset + 1] << 8;
131 DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
134 #if defined(TARGET_WORDS_BIGENDIAN)
135 ret = p[offset] << 24;
136 ret |= p[offset + 1] << 16;
137 ret |= p[offset + 2] << 8;
138 ret |= p[offset + 3];
141 ret |= p[offset + 1] << 8;
142 ret |= p[offset + 1] << 8;
143 ret |= p[offset + 2] << 16;
144 ret |= p[offset + 3] << 24;
146 DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
149 DPRINTF("BUG in %s\n", __func__);
153 case 0x20: /* Block erase */
154 case 0x50: /* Clear status register */
155 case 0x60: /* Block /un)lock */
156 case 0x70: /* Status Register */
157 case 0xe8: /* Write block */
158 /* Status register read */
160 DPRINTF("%s: status %x\n", __func__, ret);
162 case 0x98: /* Query mode */
163 if (boff > pfl->cfi_len)
166 ret = pfl->cfi_table[boff];
169 /* This should never happen : reset state & treat it as a read */
170 DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
177 /* update flash content on disk */
178 static void pflash_update(pflash_t *pfl, int offset,
183 offset_end = offset + size;
184 /* round to sectors */
185 offset = offset >> 9;
186 offset_end = (offset_end + 511) >> 9;
187 bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
188 offset_end - offset);
192 static void pflash_write (pflash_t *pfl, target_ulong offset, uint32_t value,
199 /* WARNING: when the memory area is in ROMD mode, the offset is a
200 ram offset, not a physical address */
203 if (pfl->wcycle == 0)
204 offset -= (target_ulong)(long)pfl->storage;
208 DPRINTF("%s: offset %08x %08x %d wcycle 0x%x\n",
209 __func__, offset, value, width, pfl->wcycle);
211 /* Set the device in I/O access mode */
212 cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
213 boff = offset & (pfl->sector_len - 1);
217 else if (pfl->width == 4)
220 switch (pfl->wcycle) {
226 case 0x20: /* Block erase */
228 offset &= ~(pfl->sector_len - 1);
230 DPRINTF("%s: block erase at 0x%x bytes 0x%x\n", __func__,
231 offset, pfl->sector_len);
233 memset(p + offset, 0xff, pfl->sector_len);
234 pflash_update(pfl, offset, pfl->sector_len);
235 pfl->status |= 0x80; /* Ready! */
237 case 0x50: /* Clear status bits */
238 DPRINTF("%s: Clear status bits\n", __func__);
241 case 0x60: /* Block (un)lock */
242 DPRINTF("%s: Block unlock\n", __func__);
244 case 0x70: /* Status Register */
245 DPRINTF("%s: Read status register\n", __func__);
248 case 0x98: /* CFI query */
249 DPRINTF("%s: CFI query\n", __func__);
251 case 0xe8: /* Write to buffer */
252 DPRINTF("%s: Write to buffer\n", __func__);
253 pfl->status |= 0x80; /* Ready! */
255 case 0xff: /* Read array mode */
256 DPRINTF("%s: Read array mode\n", __func__);
266 case 0x20: /* Block erase */
268 if (cmd == 0xd0) { /* confirm */
271 } if (cmd == 0xff) { /* read array mode */
278 DPRINTF("%s: block write of 0x%x bytes\n", __func__, cmd);
286 } else if (cmd == 0x01) {
289 } else if (cmd == 0xff) {
292 DPRINTF("%s: Unknown (un)locking command\n", __func__);
300 DPRINTF("%s: leaving query mode\n", __func__);
309 case 0xe8: /* Block write */
311 DPRINTF("%s: block write offset 0x%x value 0x%x counter 0x%x\n",
312 __func__, offset, value, pfl->counter);
316 pflash_update(pfl, offset, 1);
319 #if defined(TARGET_WORDS_BIGENDIAN)
320 p[offset] = value >> 8;
321 p[offset + 1] = value;
324 p[offset + 1] = value >> 8;
326 pflash_update(pfl, offset, 2);
329 #if defined(TARGET_WORDS_BIGENDIAN)
330 p[offset] = value >> 24;
331 p[offset + 1] = value >> 16;
332 p[offset + 2] = value >> 8;
333 p[offset + 3] = value;
336 p[offset + 1] = value >> 8;
337 p[offset + 2] = value >> 16;
338 p[offset + 3] = value >> 24;
340 pflash_update(pfl, offset, 4);
347 DPRINTF("%s: block write finished\n", __func__);
355 case 3: /* Confirm mode */
357 case 0xe8: /* Block write */
363 DPRINTF("%s: unknown command for \"write block\"\n", __func__);
364 PFLASH_BUG("Write block confirm");
369 /* Should never happen */
370 DPRINTF("%s: invalid write state\n", __func__);
376 printf("%s: Unimplemented flash cmd sequence "
377 "(offset 0x%x, wcycle 0x%x cmd 0x%x value 0x%x\n",
378 __func__, offset, pfl->wcycle, pfl->cmd, value);
381 cpu_register_physical_memory(pfl->base, pfl->total_len,
382 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
391 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
393 return pflash_read(opaque, addr, 1);
396 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
398 pflash_t *pfl = opaque;
400 return pflash_read(pfl, addr, 2);
403 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
405 pflash_t *pfl = opaque;
407 return pflash_read(pfl, addr, 4);
410 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
413 pflash_write(opaque, addr, value, 1);
416 static void pflash_writew (void *opaque, target_phys_addr_t addr,
419 pflash_t *pfl = opaque;
421 pflash_write(pfl, addr, value, 2);
424 static void pflash_writel (void *opaque, target_phys_addr_t addr,
427 pflash_t *pfl = opaque;
429 pflash_write(pfl, addr, value, 4);
432 static CPUWriteMemoryFunc *pflash_write_ops[] = {
438 static CPUReadMemoryFunc *pflash_read_ops[] = {
444 /* Count trailing zeroes of a 32 bits quantity */
445 static int ctz32 (uint32_t n)
470 #if 0 /* This is not necessary as n is never 0 */
478 pflash_t *pflash_register (target_phys_addr_t base, ram_addr_t off,
479 BlockDriverState *bs,
480 target_ulong sector_len, int nb_blocs, int width,
481 uint16_t id0, uint16_t id1,
482 uint16_t id2, uint16_t id3)
485 target_long total_len;
487 total_len = sector_len * nb_blocs;
489 /* XXX: to be fixed */
490 if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
491 total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
494 pfl = qemu_mallocz(sizeof(pflash_t));
498 pfl->storage = phys_ram_base + off;
499 pfl->fl_mem = cpu_register_io_memory(0,
500 pflash_read_ops, pflash_write_ops, pfl);
502 cpu_register_physical_memory(base, total_len,
503 off | pfl->fl_mem | IO_MEM_ROMD);
507 /* read the initial flash content */
508 bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
510 #if 0 /* XXX: there should be a bit to set up read-only,
511 * the same way the hardware does (with WP pin).
517 pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
519 pfl->sector_len = sector_len;
520 pfl->total_len = total_len;
529 /* Hardcoded CFI table */
531 /* Standard "QRY" string */
532 pfl->cfi_table[0x10] = 'Q';
533 pfl->cfi_table[0x11] = 'R';
534 pfl->cfi_table[0x12] = 'Y';
535 /* Command set (Intel) */
536 pfl->cfi_table[0x13] = 0x01;
537 pfl->cfi_table[0x14] = 0x00;
538 /* Primary extended table address (none) */
539 pfl->cfi_table[0x15] = 0x31;
540 pfl->cfi_table[0x16] = 0x00;
541 /* Alternate command set (none) */
542 pfl->cfi_table[0x17] = 0x00;
543 pfl->cfi_table[0x18] = 0x00;
544 /* Alternate extended table (none) */
545 pfl->cfi_table[0x19] = 0x00;
546 pfl->cfi_table[0x1A] = 0x00;
548 pfl->cfi_table[0x1B] = 0x45;
550 pfl->cfi_table[0x1C] = 0x55;
551 /* Vpp min (no Vpp pin) */
552 pfl->cfi_table[0x1D] = 0x00;
553 /* Vpp max (no Vpp pin) */
554 pfl->cfi_table[0x1E] = 0x00;
556 pfl->cfi_table[0x1F] = 0x07;
557 /* Timeout for min size buffer write */
558 pfl->cfi_table[0x20] = 0x07;
559 /* Typical timeout for block erase */
560 pfl->cfi_table[0x21] = 0x0a;
561 /* Typical timeout for full chip erase (4096 ms) */
562 pfl->cfi_table[0x22] = 0x00;
564 pfl->cfi_table[0x23] = 0x04;
565 /* Max timeout for buffer write */
566 pfl->cfi_table[0x24] = 0x04;
567 /* Max timeout for block erase */
568 pfl->cfi_table[0x25] = 0x04;
569 /* Max timeout for chip erase */
570 pfl->cfi_table[0x26] = 0x00;
572 pfl->cfi_table[0x27] = ctz32(total_len); // + 1;
573 /* Flash device interface (8 & 16 bits) */
574 pfl->cfi_table[0x28] = 0x02;
575 pfl->cfi_table[0x29] = 0x00;
576 /* Max number of bytes in multi-bytes write */
577 pfl->cfi_table[0x2A] = 0x04;
578 pfl->cfi_table[0x2B] = 0x00;
579 /* Number of erase block regions (uniform) */
580 pfl->cfi_table[0x2C] = 0x01;
581 /* Erase block region 1 */
582 pfl->cfi_table[0x2D] = nb_blocs - 1;
583 pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
584 pfl->cfi_table[0x2F] = sector_len >> 8;
585 pfl->cfi_table[0x30] = sector_len >> 16;
588 pfl->cfi_table[0x31] = 'P';
589 pfl->cfi_table[0x32] = 'R';
590 pfl->cfi_table[0x33] = 'I';
592 pfl->cfi_table[0x34] = '1';
593 pfl->cfi_table[0x35] = '1';
595 pfl->cfi_table[0x36] = 0x00;
596 pfl->cfi_table[0x37] = 0x00;
597 pfl->cfi_table[0x38] = 0x00;
598 pfl->cfi_table[0x39] = 0x00;
600 pfl->cfi_table[0x3a] = 0x00;
602 pfl->cfi_table[0x3b] = 0x00;
603 pfl->cfi_table[0x3c] = 0x00;