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 #include "qemu-timer.h"
44 //#define PFLASH_DEBUG
46 #define DPRINTF(fmt, args...) \
48 printf("PFLASH: " fmt , ##args); \
51 #define DPRINTF(fmt, args...) do { } while (0)
56 target_phys_addr_t base;
61 int wcycle; /* if 0, the flash is read normally */
67 uint16_t unlock_addr[2];
69 uint8_t cfi_table[0x52];
77 static void pflash_register_memory(pflash_t *pfl, int rom_mode)
79 unsigned long phys_offset = pfl->fl_mem;
83 phys_offset |= pfl->off | IO_MEM_ROMD;
84 pfl->rom_mode = rom_mode;
86 for (i = 0; i < pfl->mappings; i++)
87 cpu_register_physical_memory(pfl->base + i * pfl->chip_len,
88 pfl->chip_len, phys_offset);
91 static void pflash_timer (void *opaque)
93 pflash_t *pfl = opaque;
95 DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
101 pflash_register_memory(pfl, 1);
107 static uint32_t pflash_read (pflash_t *pfl, uint32_t offset, int width)
113 DPRINTF("%s: offset " TARGET_FMT_lx "\n", __func__, offset);
117 /* Lazy reset of to ROMD mode */
118 if (pfl->wcycle == 0)
119 pflash_register_memory(pfl, 1);
121 offset &= pfl->chip_len - 1;
122 boff = offset & 0xFF;
125 else if (pfl->width == 4)
129 /* This should never happen : reset state & treat it as a read*/
130 DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
134 /* We accept reads during second unlock sequence... */
137 /* Flash area read */
142 // DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
145 #if defined(TARGET_WORDS_BIGENDIAN)
146 ret = p[offset] << 8;
147 ret |= p[offset + 1];
150 ret |= p[offset + 1] << 8;
152 // DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
155 #if defined(TARGET_WORDS_BIGENDIAN)
156 ret = p[offset] << 24;
157 ret |= p[offset + 1] << 16;
158 ret |= p[offset + 2] << 8;
159 ret |= p[offset + 3];
162 ret |= p[offset + 1] << 8;
163 ret |= p[offset + 2] << 16;
164 ret |= p[offset + 3] << 24;
166 // DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
175 ret = pfl->ident[boff & 0x01];
178 ret = 0x00; /* Pretend all sectors are unprotected */
182 if (pfl->ident[2 + (boff & 0x01)] == (uint8_t)-1)
184 ret = pfl->ident[2 + (boff & 0x01)];
189 DPRINTF("%s: ID " TARGET_FMT_ld " %x\n", __func__, boff, ret);
194 /* Status register read */
196 DPRINTF("%s: status %x\n", __func__, ret);
202 if (boff > pfl->cfi_len)
205 ret = pfl->cfi_table[boff];
212 /* update flash content on disk */
213 static void pflash_update(pflash_t *pfl, int offset,
218 offset_end = offset + size;
219 /* round to sectors */
220 offset = offset >> 9;
221 offset_end = (offset_end + 511) >> 9;
222 bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
223 offset_end - offset);
227 static void pflash_write (pflash_t *pfl, uint32_t offset, uint32_t value,
235 if (pfl->cmd != 0xA0 && cmd == 0xF0) {
237 DPRINTF("%s: flash reset asked (%02x %02x)\n",
238 __func__, pfl->cmd, cmd);
242 DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d %d\n", __func__,
243 offset, value, width, pfl->wcycle);
245 offset &= pfl->chip_len - 1;
247 DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d\n", __func__,
248 offset, value, width);
249 boff = offset & (pfl->sector_len - 1);
252 else if (pfl->width == 4)
254 switch (pfl->wcycle) {
256 /* Set the device in I/O access mode if required */
258 pflash_register_memory(pfl, 0);
259 /* We're in read mode */
261 if (boff == 0x55 && cmd == 0x98) {
263 /* Enter CFI query mode */
268 if (boff != pfl->unlock_addr[0] || cmd != 0xAA) {
269 DPRINTF("%s: unlock0 failed " TARGET_FMT_lx " %02x %04x\n",
270 __func__, boff, cmd, pfl->unlock_addr[0]);
273 DPRINTF("%s: unlock sequence started\n", __func__);
276 /* We started an unlock sequence */
278 if (boff != pfl->unlock_addr[1] || cmd != 0x55) {
279 DPRINTF("%s: unlock1 failed " TARGET_FMT_lx " %02x\n", __func__,
283 DPRINTF("%s: unlock sequence done\n", __func__);
286 /* We finished an unlock sequence */
287 if (!pfl->bypass && boff != pfl->unlock_addr[0]) {
288 DPRINTF("%s: command failed " TARGET_FMT_lx " %02x\n", __func__,
300 DPRINTF("%s: starting command %02x\n", __func__, cmd);
303 DPRINTF("%s: unknown command %02x\n", __func__, cmd);
310 /* We need another unlock sequence */
313 DPRINTF("%s: write data offset " TARGET_FMT_lx " %08x %d\n",
314 __func__, offset, value, width);
319 pflash_update(pfl, offset, 1);
322 #if defined(TARGET_WORDS_BIGENDIAN)
323 p[offset] &= value >> 8;
324 p[offset + 1] &= value;
327 p[offset + 1] &= value >> 8;
329 pflash_update(pfl, offset, 2);
332 #if defined(TARGET_WORDS_BIGENDIAN)
333 p[offset] &= value >> 24;
334 p[offset + 1] &= value >> 16;
335 p[offset + 2] &= value >> 8;
336 p[offset + 3] &= value;
339 p[offset + 1] &= value >> 8;
340 p[offset + 2] &= value >> 16;
341 p[offset + 3] &= value >> 24;
343 pflash_update(pfl, offset, 4);
346 pfl->status = 0x00 | ~(value & 0x80);
347 /* Let's pretend write is immediate */
352 if (pfl->bypass && cmd == 0x00) {
353 /* Unlock bypass reset */
356 /* We can enter CFI query mode from autoselect mode */
357 if (boff == 0x55 && cmd == 0x98)
361 DPRINTF("%s: invalid write for command %02x\n",
368 /* Ignore writes while flash data write is occuring */
369 /* As we suppose write is immediate, this should never happen */
374 /* Should never happen */
375 DPRINTF("%s: invalid command state %02x (wc 4)\n",
383 if (boff != pfl->unlock_addr[0]) {
384 DPRINTF("%s: chip erase: invalid address " TARGET_FMT_lx "\n",
389 DPRINTF("%s: start chip erase\n", __func__);
390 memset(pfl->storage, 0xFF, pfl->chip_len);
392 pflash_update(pfl, 0, pfl->chip_len);
393 /* Let's wait 5 seconds before chip erase is done */
394 qemu_mod_timer(pfl->timer,
395 qemu_get_clock(vm_clock) + (ticks_per_sec * 5));
400 offset &= ~(pfl->sector_len - 1);
401 DPRINTF("%s: start sector erase at " TARGET_FMT_lx "\n", __func__,
403 memset(p + offset, 0xFF, pfl->sector_len);
404 pflash_update(pfl, offset, pfl->sector_len);
406 /* Let's wait 1/2 second before sector erase is done */
407 qemu_mod_timer(pfl->timer,
408 qemu_get_clock(vm_clock) + (ticks_per_sec / 2));
411 DPRINTF("%s: invalid command %02x (wc 5)\n", __func__, cmd);
419 /* Ignore writes during chip erase */
422 /* Ignore writes during sector erase */
425 /* Should never happen */
426 DPRINTF("%s: invalid command state %02x (wc 6)\n",
431 case 7: /* Special value for CFI queries */
432 DPRINTF("%s: invalid write in CFI query mode\n", __func__);
435 /* Should never happen */
436 DPRINTF("%s: invalid write state (wc 7)\n", __func__);
457 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
459 return pflash_read(opaque, addr, 1);
462 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
464 pflash_t *pfl = opaque;
466 return pflash_read(pfl, addr, 2);
469 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
471 pflash_t *pfl = opaque;
473 return pflash_read(pfl, addr, 4);
476 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
479 pflash_write(opaque, addr, value, 1);
482 static void pflash_writew (void *opaque, target_phys_addr_t addr,
485 pflash_t *pfl = opaque;
487 pflash_write(pfl, addr, value, 2);
490 static void pflash_writel (void *opaque, target_phys_addr_t addr,
493 pflash_t *pfl = opaque;
495 pflash_write(pfl, addr, value, 4);
498 static CPUWriteMemoryFunc *pflash_write_ops[] = {
504 static CPUReadMemoryFunc *pflash_read_ops[] = {
510 /* Count trailing zeroes of a 32 bits quantity */
511 static int ctz32 (uint32_t n)
536 #if 0 /* This is not necessary as n is never 0 */
544 pflash_t *pflash_cfi02_register(target_phys_addr_t base, ram_addr_t off,
545 BlockDriverState *bs, uint32_t sector_len,
546 int nb_blocs, int nb_mappings, int width,
547 uint16_t id0, uint16_t id1,
548 uint16_t id2, uint16_t id3,
549 uint16_t unlock_addr0, uint16_t unlock_addr1)
554 chip_len = sector_len * nb_blocs;
555 /* XXX: to be fixed */
557 if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
558 total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
561 pfl = qemu_mallocz(sizeof(pflash_t));
564 pfl->storage = phys_ram_base + off;
565 pfl->fl_mem = cpu_register_io_memory(0, pflash_read_ops, pflash_write_ops,
569 pfl->chip_len = chip_len;
570 pfl->mappings = nb_mappings;
571 pflash_register_memory(pfl, 1);
574 /* read the initial flash content */
575 bdrv_read(pfl->bs, 0, pfl->storage, chip_len >> 9);
577 #if 0 /* XXX: there should be a bit to set up read-only,
578 * the same way the hardware does (with WP pin).
584 pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
585 pfl->sector_len = sector_len;
594 pfl->unlock_addr[0] = unlock_addr0;
595 pfl->unlock_addr[1] = unlock_addr1;
596 /* Hardcoded CFI table (mostly from SG29 Spansion flash) */
598 /* Standard "QRY" string */
599 pfl->cfi_table[0x10] = 'Q';
600 pfl->cfi_table[0x11] = 'R';
601 pfl->cfi_table[0x12] = 'Y';
602 /* Command set (AMD/Fujitsu) */
603 pfl->cfi_table[0x13] = 0x02;
604 pfl->cfi_table[0x14] = 0x00;
605 /* Primary extended table address */
606 pfl->cfi_table[0x15] = 0x31;
607 pfl->cfi_table[0x16] = 0x00;
608 /* Alternate command set (none) */
609 pfl->cfi_table[0x17] = 0x00;
610 pfl->cfi_table[0x18] = 0x00;
611 /* Alternate extended table (none) */
612 pfl->cfi_table[0x19] = 0x00;
613 pfl->cfi_table[0x1A] = 0x00;
615 pfl->cfi_table[0x1B] = 0x27;
617 pfl->cfi_table[0x1C] = 0x36;
618 /* Vpp min (no Vpp pin) */
619 pfl->cfi_table[0x1D] = 0x00;
620 /* Vpp max (no Vpp pin) */
621 pfl->cfi_table[0x1E] = 0x00;
623 pfl->cfi_table[0x1F] = 0x07;
624 /* Timeout for min size buffer write (NA) */
625 pfl->cfi_table[0x20] = 0x00;
626 /* Typical timeout for block erase (512 ms) */
627 pfl->cfi_table[0x21] = 0x09;
628 /* Typical timeout for full chip erase (4096 ms) */
629 pfl->cfi_table[0x22] = 0x0C;
631 pfl->cfi_table[0x23] = 0x01;
632 /* Max timeout for buffer write (NA) */
633 pfl->cfi_table[0x24] = 0x00;
634 /* Max timeout for block erase */
635 pfl->cfi_table[0x25] = 0x0A;
636 /* Max timeout for chip erase */
637 pfl->cfi_table[0x26] = 0x0D;
639 pfl->cfi_table[0x27] = ctz32(chip_len);
640 /* Flash device interface (8 & 16 bits) */
641 pfl->cfi_table[0x28] = 0x02;
642 pfl->cfi_table[0x29] = 0x00;
643 /* Max number of bytes in multi-bytes write */
644 /* XXX: disable buffered write as it's not supported */
645 // pfl->cfi_table[0x2A] = 0x05;
646 pfl->cfi_table[0x2A] = 0x00;
647 pfl->cfi_table[0x2B] = 0x00;
648 /* Number of erase block regions (uniform) */
649 pfl->cfi_table[0x2C] = 0x01;
650 /* Erase block region 1 */
651 pfl->cfi_table[0x2D] = nb_blocs - 1;
652 pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
653 pfl->cfi_table[0x2F] = sector_len >> 8;
654 pfl->cfi_table[0x30] = sector_len >> 16;
657 pfl->cfi_table[0x31] = 'P';
658 pfl->cfi_table[0x32] = 'R';
659 pfl->cfi_table[0x33] = 'I';
661 pfl->cfi_table[0x34] = '1';
662 pfl->cfi_table[0x35] = '0';
664 pfl->cfi_table[0x36] = 0x00;
665 pfl->cfi_table[0x37] = 0x00;
666 pfl->cfi_table[0x38] = 0x00;
667 pfl->cfi_table[0x39] = 0x00;
669 pfl->cfi_table[0x3a] = 0x00;
671 pfl->cfi_table[0x3b] = 0x00;
672 pfl->cfi_table[0x3c] = 0x00;