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)
54 target_ulong sector_len;
55 target_ulong total_len;
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, target_ulong offset, int width)
94 DPRINTF("%s: offset %08x\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 %d %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, target_ulong 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 */
211 if (pfl->wcycle == 0)
212 offset -= (target_ulong)(long)pfl->storage;
217 DPRINTF("%s: offset %08x %08x %d\n", __func__, offset, value, width);
218 if (pfl->cmd != 0xA0 && cmd == 0xF0) {
219 DPRINTF("%s: flash reset asked (%02x %02x)\n",
220 __func__, pfl->cmd, cmd);
223 /* Set the device in I/O access mode */
224 cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
225 boff = offset & (pfl->sector_len - 1);
228 else if (pfl->width == 4)
230 switch (pfl->wcycle) {
232 /* We're in read mode */
234 if (boff == 0x55 && cmd == 0x98) {
236 /* Enter CFI query mode */
241 if (boff != 0x555 || cmd != 0xAA) {
242 DPRINTF("%s: unlock0 failed %04x %02x %04x\n",
243 __func__, boff, cmd, 0x555);
246 DPRINTF("%s: unlock sequence started\n", __func__);
249 /* We started an unlock sequence */
251 if (boff != 0x2AA || cmd != 0x55) {
252 DPRINTF("%s: unlock1 failed %04x %02x\n", __func__, boff, cmd);
255 DPRINTF("%s: unlock sequence done\n", __func__);
258 /* We finished an unlock sequence */
259 if (!pfl->bypass && boff != 0x555) {
260 DPRINTF("%s: command failed %04x %02x\n", __func__, boff, cmd);
271 DPRINTF("%s: starting command %02x\n", __func__, cmd);
274 DPRINTF("%s: unknown command %02x\n", __func__, cmd);
281 /* We need another unlock sequence */
284 DPRINTF("%s: write data offset %08x %08x %d\n",
285 __func__, offset, value, width);
290 pflash_update(pfl, offset, 1);
293 #if defined(TARGET_WORDS_BIGENDIAN)
294 p[offset] &= value >> 8;
295 p[offset + 1] &= value;
298 p[offset + 1] &= value >> 8;
300 pflash_update(pfl, offset, 2);
303 #if defined(TARGET_WORDS_BIGENDIAN)
304 p[offset] &= value >> 24;
305 p[offset + 1] &= value >> 16;
306 p[offset + 2] &= value >> 8;
307 p[offset + 3] &= value;
310 p[offset + 1] &= value >> 8;
311 p[offset + 2] &= value >> 16;
312 p[offset + 3] &= value >> 24;
314 pflash_update(pfl, offset, 4);
317 pfl->status = 0x00 | ~(value & 0x80);
318 /* Let's pretend write is immediate */
323 if (pfl->bypass && cmd == 0x00) {
324 /* Unlock bypass reset */
327 /* We can enter CFI query mode from autoselect mode */
328 if (boff == 0x55 && cmd == 0x98)
332 DPRINTF("%s: invalid write for command %02x\n",
339 /* Ignore writes while flash data write is occuring */
340 /* As we suppose write is immediate, this should never happen */
345 /* Should never happen */
346 DPRINTF("%s: invalid command state %02x (wc 4)\n",
355 DPRINTF("%s: chip erase: invalid address %04x\n",
360 DPRINTF("%s: start chip erase\n", __func__);
361 memset(pfl->storage, 0xFF, pfl->total_len);
363 pflash_update(pfl, 0, pfl->total_len);
364 /* Let's wait 5 seconds before chip erase is done */
365 qemu_mod_timer(pfl->timer,
366 qemu_get_clock(vm_clock) + (ticks_per_sec * 5));
371 offset &= ~(pfl->sector_len - 1);
372 DPRINTF("%s: start sector erase at %08x\n", __func__, offset);
373 memset(p + offset, 0xFF, pfl->sector_len);
374 pflash_update(pfl, offset, pfl->sector_len);
376 /* Let's wait 1/2 second before sector erase is done */
377 qemu_mod_timer(pfl->timer,
378 qemu_get_clock(vm_clock) + (ticks_per_sec / 2));
381 DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
389 /* Ignore writes during chip erase */
392 /* Ignore writes during sector erase */
395 /* Should never happen */
396 DPRINTF("%s: invalid command state %02x (wc 6)\n",
401 case 7: /* Special value for CFI queries */
402 DPRINTF("%s: invalid write in CFI query mode\n", __func__);
405 /* Should never happen */
406 DPRINTF("%s: invalid write state (wc 7)\n", __func__);
415 if (pfl->wcycle != 0) {
416 cpu_register_physical_memory(pfl->base, pfl->total_len,
417 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
431 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
433 return pflash_read(opaque, addr, 1);
436 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
438 pflash_t *pfl = opaque;
440 return pflash_read(pfl, addr, 2);
443 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
445 pflash_t *pfl = opaque;
447 return pflash_read(pfl, addr, 4);
450 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
453 pflash_write(opaque, addr, value, 1);
456 static void pflash_writew (void *opaque, target_phys_addr_t addr,
459 pflash_t *pfl = opaque;
461 pflash_write(pfl, addr, value, 2);
464 static void pflash_writel (void *opaque, target_phys_addr_t addr,
467 pflash_t *pfl = opaque;
469 pflash_write(pfl, addr, value, 4);
472 static CPUWriteMemoryFunc *pflash_write_ops[] = {
478 static CPUReadMemoryFunc *pflash_read_ops[] = {
484 /* Count trailing zeroes of a 32 bits quantity */
485 static int ctz32 (uint32_t n)
510 #if 0 /* This is not necessary as n is never 0 */
518 pflash_t *pflash_register (target_ulong base, ram_addr_t off,
519 BlockDriverState *bs,
520 target_ulong sector_len, int nb_blocs, int width,
521 uint16_t id0, uint16_t id1,
522 uint16_t id2, uint16_t id3)
525 target_long total_len;
527 total_len = sector_len * nb_blocs;
528 /* XXX: to be fixed */
529 if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
530 total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
532 pfl = qemu_mallocz(sizeof(pflash_t));
535 pfl->storage = phys_ram_base + off;
536 pfl->fl_mem = cpu_register_io_memory(0, pflash_read_ops, pflash_write_ops, pfl);
538 cpu_register_physical_memory(base, total_len,
539 off | pfl->fl_mem | IO_MEM_ROMD);
542 /* read the initial flash content */
543 bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
545 #if 0 /* XXX: there should be a bit to set up read-only,
546 * the same way the hardware does (with WP pin).
552 pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
554 pfl->sector_len = sector_len;
555 pfl->total_len = total_len;
564 /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
566 /* Standard "QRY" string */
567 pfl->cfi_table[0x10] = 'Q';
568 pfl->cfi_table[0x11] = 'R';
569 pfl->cfi_table[0x12] = 'Y';
570 /* Command set (AMD/Fujitsu) */
571 pfl->cfi_table[0x13] = 0x02;
572 pfl->cfi_table[0x14] = 0x00;
573 /* Primary extended table address (none) */
574 pfl->cfi_table[0x15] = 0x00;
575 pfl->cfi_table[0x16] = 0x00;
576 /* Alternate command set (none) */
577 pfl->cfi_table[0x17] = 0x00;
578 pfl->cfi_table[0x18] = 0x00;
579 /* Alternate extended table (none) */
580 pfl->cfi_table[0x19] = 0x00;
581 pfl->cfi_table[0x1A] = 0x00;
583 pfl->cfi_table[0x1B] = 0x27;
585 pfl->cfi_table[0x1C] = 0x36;
586 /* Vpp min (no Vpp pin) */
587 pfl->cfi_table[0x1D] = 0x00;
588 /* Vpp max (no Vpp pin) */
589 pfl->cfi_table[0x1E] = 0x00;
591 pfl->cfi_table[0x1F] = 0x07;
592 /* Timeout for min size buffer write (16 µs) */
593 pfl->cfi_table[0x20] = 0x04;
594 /* Typical timeout for block erase (512 ms) */
595 pfl->cfi_table[0x21] = 0x09;
596 /* Typical timeout for full chip erase (4096 ms) */
597 pfl->cfi_table[0x22] = 0x0C;
599 pfl->cfi_table[0x23] = 0x01;
600 /* Max timeout for buffer write */
601 pfl->cfi_table[0x24] = 0x04;
602 /* Max timeout for block erase */
603 pfl->cfi_table[0x25] = 0x0A;
604 /* Max timeout for chip erase */
605 pfl->cfi_table[0x26] = 0x0D;
607 pfl->cfi_table[0x27] = ctz32(total_len) + 1;
608 /* Flash device interface (8 & 16 bits) */
609 pfl->cfi_table[0x28] = 0x02;
610 pfl->cfi_table[0x29] = 0x00;
611 /* Max number of bytes in multi-bytes write */
612 pfl->cfi_table[0x2A] = 0x05;
613 pfl->cfi_table[0x2B] = 0x00;
614 /* Number of erase block regions (uniform) */
615 pfl->cfi_table[0x2C] = 0x01;
616 /* Erase block region 1 */
617 pfl->cfi_table[0x2D] = nb_blocs - 1;
618 pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
619 pfl->cfi_table[0x2F] = sector_len >> 8;
620 pfl->cfi_table[0x30] = sector_len >> 16;