2 * CFI parallel flash with AMD command set emulation
4 * Copyright (c) 2005 Jocelyn Mayer
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * For now, this code can emulate flashes of 1, 2 or 4 bytes width.
23 * Supported commands/modes are:
29 * - unlock bypass command
32 * It does not support flash interleaving.
33 * It does not implement boot blocs with reduced size
34 * It does not implement software data protection as found in many real chips
35 * It does not implement erase suspend/resume commands
36 * It does not implement multiple sectors erase
41 //#define PFLASH_DEBUG
43 #define DPRINTF(fmt, args...) \
45 printf("PFLASH: " fmt , ##args); \
48 #define DPRINTF(fmt, args...) do { } while (0)
53 target_phys_addr_t base;
57 int wcycle; /* if 0, the flash is read normally */
64 uint8_t cfi_table[0x52];
71 static void pflash_timer (void *opaque)
73 pflash_t *pfl = opaque;
75 DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
81 cpu_register_physical_memory(pfl->base, pfl->total_len,
82 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
88 static uint32_t pflash_read (pflash_t *pfl, uint32_t offset, int width)
94 DPRINTF("%s: offset " TARGET_FMT_lx "\n", __func__, offset);
100 else if (pfl->width == 4)
104 /* This should never happen : reset state & treat it as a read*/
105 DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
109 /* We accept reads during second unlock sequence... */
112 /* Flash area read */
117 // DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
120 #if defined(TARGET_WORDS_BIGENDIAN)
121 ret = p[offset] << 8;
122 ret |= p[offset + 1];
125 ret |= p[offset + 1] << 8;
127 // DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
130 #if defined(TARGET_WORDS_BIGENDIAN)
131 ret = p[offset] << 24;
132 ret |= p[offset + 1] << 16;
133 ret |= p[offset + 2] << 8;
134 ret |= p[offset + 3];
137 ret |= p[offset + 1] << 8;
138 ret |= p[offset + 2] << 16;
139 ret |= p[offset + 3] << 24;
141 // DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
150 ret = pfl->ident[boff & 0x01];
153 ret = 0x00; /* Pretend all sectors are unprotected */
157 if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
159 ret = pfl->ident[2 + (boff & 0x01)];
164 DPRINTF("%s: ID " TARGET_FMT_ld " %x\n", __func__, boff, ret);
169 /* Status register read */
171 DPRINTF("%s: status %x\n", __func__, ret);
177 if (boff > pfl->cfi_len)
180 ret = pfl->cfi_table[boff];
187 /* update flash content on disk */
188 static void pflash_update(pflash_t *pfl, int offset,
193 offset_end = offset + size;
194 /* round to sectors */
195 offset = offset >> 9;
196 offset_end = (offset_end + 511) >> 9;
197 bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
198 offset_end - offset);
202 static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
209 /* WARNING: when the memory area is in ROMD mode, the offset is a
210 ram offset, not a physical address */
212 if (pfl->cmd != 0xA0 && cmd == 0xF0) {
214 DPRINTF("%s: flash reset asked (%02x %02x)\n",
215 __func__, pfl->cmd, cmd);
219 DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d %d\n", __func__,
220 offset, value, width, pfl->wcycle);
221 if (pfl->wcycle == 0)
222 offset -= (uint32_t)(long)pfl->storage;
226 DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d\n", __func__,
227 offset, value, width);
228 /* Set the device in I/O access mode */
229 cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
230 boff = offset & (pfl->sector_len - 1);
233 else if (pfl->width == 4)
235 switch (pfl->wcycle) {
237 /* We're in read mode */
239 if (boff == 0x55 && cmd == 0x98) {
241 /* Enter CFI query mode */
246 if (boff != 0x555 || cmd != 0xAA) {
247 DPRINTF("%s: unlock0 failed " TARGET_FMT_lx " %02x %04x\n",
248 __func__, boff, cmd, 0x555);
251 DPRINTF("%s: unlock sequence started\n", __func__);
254 /* We started an unlock sequence */
256 if (boff != 0x2AA || cmd != 0x55) {
257 DPRINTF("%s: unlock1 failed " TARGET_FMT_lx " %02x\n", __func__,
261 DPRINTF("%s: unlock sequence done\n", __func__);
264 /* We finished an unlock sequence */
265 if (!pfl->bypass && boff != 0x555) {
266 DPRINTF("%s: command failed " TARGET_FMT_lx " %02x\n", __func__,
278 DPRINTF("%s: starting command %02x\n", __func__, cmd);
281 DPRINTF("%s: unknown command %02x\n", __func__, cmd);
288 /* We need another unlock sequence */
291 DPRINTF("%s: write data offset " TARGET_FMT_lx " %08x %d\n",
292 __func__, offset, value, width);
297 pflash_update(pfl, offset, 1);
300 #if defined(TARGET_WORDS_BIGENDIAN)
301 p[offset] &= value >> 8;
302 p[offset + 1] &= value;
305 p[offset + 1] &= value >> 8;
307 pflash_update(pfl, offset, 2);
310 #if defined(TARGET_WORDS_BIGENDIAN)
311 p[offset] &= value >> 24;
312 p[offset + 1] &= value >> 16;
313 p[offset + 2] &= value >> 8;
314 p[offset + 3] &= value;
317 p[offset + 1] &= value >> 8;
318 p[offset + 2] &= value >> 16;
319 p[offset + 3] &= value >> 24;
321 pflash_update(pfl, offset, 4);
324 pfl->status = 0x00 | ~(value & 0x80);
325 /* Let's pretend write is immediate */
330 if (pfl->bypass && cmd == 0x00) {
331 /* Unlock bypass reset */
334 /* We can enter CFI query mode from autoselect mode */
335 if (boff == 0x55 && cmd == 0x98)
339 DPRINTF("%s: invalid write for command %02x\n",
346 /* Ignore writes while flash data write is occuring */
347 /* As we suppose write is immediate, this should never happen */
352 /* Should never happen */
353 DPRINTF("%s: invalid command state %02x (wc 4)\n",
362 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_lx "\n",
367 DPRINTF("%s: start chip erase\n", __func__);
368 memset(pfl->storage, 0xFF, pfl->total_len);
370 pflash_update(pfl, 0, pfl->total_len);
371 /* Let's wait 5 seconds before chip erase is done */
372 qemu_mod_timer(pfl->timer,
373 qemu_get_clock(vm_clock) + (ticks_per_sec * 5));
378 offset &= ~(pfl->sector_len - 1);
379 DPRINTF("%s: start sector erase at " TARGET_FMT_lx "\n", __func__,
381 memset(p + offset, 0xFF, pfl->sector_len);
382 pflash_update(pfl, offset, pfl->sector_len);
384 /* Let's wait 1/2 second before sector erase is done */
385 qemu_mod_timer(pfl->timer,
386 qemu_get_clock(vm_clock) + (ticks_per_sec / 2));
389 DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
397 /* Ignore writes during chip erase */
400 /* Ignore writes during sector erase */
403 /* Should never happen */
404 DPRINTF("%s: invalid command state %02x (wc 6)\n",
409 case 7: /* Special value for CFI queries */
410 DPRINTF("%s: invalid write in CFI query mode\n", __func__);
413 /* Should never happen */
414 DPRINTF("%s: invalid write state (wc 7)\n", __func__);
423 cpu_register_physical_memory(pfl->base, pfl->total_len,
424 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
437 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
439 return pflash_read(opaque, addr, 1);
442 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
444 pflash_t *pfl = opaque;
446 return pflash_read(pfl, addr, 2);
449 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
451 pflash_t *pfl = opaque;
453 return pflash_read(pfl, addr, 4);
456 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
459 pflash_write(opaque, addr, value, 1);
462 static void pflash_writew (void *opaque, target_phys_addr_t addr,
465 pflash_t *pfl = opaque;
467 pflash_write(pfl, addr, value, 2);
470 static void pflash_writel (void *opaque, target_phys_addr_t addr,
473 pflash_t *pfl = opaque;
475 pflash_write(pfl, addr, value, 4);
478 static CPUWriteMemoryFunc *pflash_write_ops[] = {
484 static CPUReadMemoryFunc *pflash_read_ops[] = {
490 /* Count trailing zeroes of a 32 bits quantity */
491 static int ctz32 (uint32_t n)
516 #if 0 /* This is not necessary as n is never 0 */
524 pflash_t *pflash_register (target_phys_addr_t base, ram_addr_t off,
525 BlockDriverState *bs,
526 uint32_t sector_len, int nb_blocs, int width,
527 uint16_t id0, uint16_t id1,
528 uint16_t id2, uint16_t id3)
533 total_len = sector_len * nb_blocs;
534 /* XXX: to be fixed */
536 if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
537 total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
540 pfl = qemu_mallocz(sizeof(pflash_t));
543 pfl->storage = phys_ram_base + off;
544 pfl->fl_mem = cpu_register_io_memory(0, pflash_read_ops, pflash_write_ops,
547 cpu_register_physical_memory(base, total_len,
548 off | pfl->fl_mem | IO_MEM_ROMD);
551 /* read the initial flash content */
552 bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
554 #if 0 /* XXX: there should be a bit to set up read-only,
555 * the same way the hardware does (with WP pin).
561 pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
563 pfl->sector_len = sector_len;
564 pfl->total_len = total_len;
573 /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
575 /* Standard "QRY" string */
576 pfl->cfi_table[0x10] = 'Q';
577 pfl->cfi_table[0x11] = 'R';
578 pfl->cfi_table[0x12] = 'Y';
579 /* Command set (AMD/Fujitsu) */
580 pfl->cfi_table[0x13] = 0x02;
581 pfl->cfi_table[0x14] = 0x00;
582 /* Primary extended table address (none) */
583 pfl->cfi_table[0x15] = 0x00;
584 pfl->cfi_table[0x16] = 0x00;
585 /* Alternate command set (none) */
586 pfl->cfi_table[0x17] = 0x00;
587 pfl->cfi_table[0x18] = 0x00;
588 /* Alternate extended table (none) */
589 pfl->cfi_table[0x19] = 0x00;
590 pfl->cfi_table[0x1A] = 0x00;
592 pfl->cfi_table[0x1B] = 0x27;
594 pfl->cfi_table[0x1C] = 0x36;
595 /* Vpp min (no Vpp pin) */
596 pfl->cfi_table[0x1D] = 0x00;
597 /* Vpp max (no Vpp pin) */
598 pfl->cfi_table[0x1E] = 0x00;
600 pfl->cfi_table[0x1F] = 0x07;
601 /* Timeout for min size buffer write (16 µs) */
602 pfl->cfi_table[0x20] = 0x04;
603 /* Typical timeout for block erase (512 ms) */
604 pfl->cfi_table[0x21] = 0x09;
605 /* Typical timeout for full chip erase (4096 ms) */
606 pfl->cfi_table[0x22] = 0x0C;
608 pfl->cfi_table[0x23] = 0x01;
609 /* Max timeout for buffer write */
610 pfl->cfi_table[0x24] = 0x04;
611 /* Max timeout for block erase */
612 pfl->cfi_table[0x25] = 0x0A;
613 /* Max timeout for chip erase */
614 pfl->cfi_table[0x26] = 0x0D;
616 pfl->cfi_table[0x27] = ctz32(total_len) + 1;
617 /* Flash device interface (8 & 16 bits) */
618 pfl->cfi_table[0x28] = 0x02;
619 pfl->cfi_table[0x29] = 0x00;
620 /* Max number of bytes in multi-bytes write */
621 /* XXX: disable buffered write as it's not supported */
622 // pfl->cfi_table[0x2A] = 0x05;
623 pfl->cfi_table[0x2A] = 0x00;
624 pfl->cfi_table[0x2B] = 0x00;
625 /* Number of erase block regions (uniform) */
626 pfl->cfi_table[0x2C] = 0x01;
627 /* Erase block region 1 */
628 pfl->cfi_table[0x2D] = nb_blocs - 1;
629 pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
630 pfl->cfi_table[0x2F] = sector_len >> 8;
631 pfl->cfi_table[0x30] = sector_len >> 16;