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 ...
43 #include "qemu-timer.h"
45 #define PFLASH_BUG(fmt, args...) \
47 printf("PFLASH: Possible BUG - " fmt, ##args); \
51 /* #define PFLASH_DEBUG */
53 #define DPRINTF(fmt, args...) \
55 printf("PFLASH: " fmt , ##args); \
58 #define DPRINTF(fmt, args...) do { } while (0)
64 target_ulong sector_len;
65 target_ulong total_len;
67 int wcycle; /* if 0, the flash is read normally */
74 uint8_t cfi_table[0x52];
82 static void pflash_timer (void *opaque)
84 pflash_t *pfl = opaque;
86 DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
92 cpu_register_physical_memory(pfl->base, pfl->total_len,
93 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
99 static uint32_t pflash_read (pflash_t *pfl, target_ulong offset, int width)
107 boff = offset & 0xFF; /* why this here ?? */
111 else if (pfl->width == 4)
114 DPRINTF("%s: reading offset " TARGET_FMT_lx " under cmd %02x\n",
115 __func__, boff, pfl->cmd);
119 /* Flash area read */
124 DPRINTF("%s: data offset " TARGET_FMT_lx " %02x\n",
125 __func__, offset, ret);
128 #if defined(TARGET_WORDS_BIGENDIAN)
129 ret = p[offset] << 8;
130 ret |= p[offset + 1];
133 ret |= p[offset + 1] << 8;
135 DPRINTF("%s: data offset " TARGET_FMT_lx " %04x\n",
136 __func__, offset, ret);
139 #if defined(TARGET_WORDS_BIGENDIAN)
140 ret = p[offset] << 24;
141 ret |= p[offset + 1] << 16;
142 ret |= p[offset + 2] << 8;
143 ret |= p[offset + 3];
146 ret |= p[offset + 1] << 8;
147 ret |= p[offset + 1] << 8;
148 ret |= p[offset + 2] << 16;
149 ret |= p[offset + 3] << 24;
151 DPRINTF("%s: data offset " TARGET_FMT_lx " %08x\n",
152 __func__, offset, ret);
155 DPRINTF("BUG in %s\n", __func__);
159 case 0x20: /* Block erase */
160 case 0x50: /* Clear status register */
161 case 0x60: /* Block /un)lock */
162 case 0x70: /* Status Register */
163 case 0xe8: /* Write block */
164 /* Status register read */
166 DPRINTF("%s: status %x\n", __func__, ret);
168 case 0x98: /* Query mode */
169 if (boff > pfl->cfi_len)
172 ret = pfl->cfi_table[boff];
175 /* This should never happen : reset state & treat it as a read */
176 DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
183 /* update flash content on disk */
184 static void pflash_update(pflash_t *pfl, int offset,
189 offset_end = offset + size;
190 /* round to sectors */
191 offset = offset >> 9;
192 offset_end = (offset_end + 511) >> 9;
193 bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
194 offset_end - offset);
198 static void pflash_write (pflash_t *pfl, target_ulong offset, uint32_t value,
205 /* WARNING: when the memory area is in ROMD mode, the offset is a
206 ram offset, not a physical address */
209 if (pfl->wcycle == 0)
210 offset -= (target_ulong)(long)pfl->storage;
214 DPRINTF("%s: offset " TARGET_FMT_lx " %08x %d wcycle 0x%x\n",
215 __func__, offset, value, width, pfl->wcycle);
217 /* Set the device in I/O access mode */
218 cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
219 boff = offset & (pfl->sector_len - 1);
223 else if (pfl->width == 4)
226 switch (pfl->wcycle) {
232 case 0x20: /* Block erase */
234 offset &= ~(pfl->sector_len - 1);
236 DPRINTF("%s: block erase at " TARGET_FMT_lx " bytes "
238 __func__, offset, pfl->sector_len);
240 memset(p + offset, 0xff, pfl->sector_len);
241 pflash_update(pfl, offset, pfl->sector_len);
242 pfl->status |= 0x80; /* Ready! */
244 case 0x50: /* Clear status bits */
245 DPRINTF("%s: Clear status bits\n", __func__);
248 case 0x60: /* Block (un)lock */
249 DPRINTF("%s: Block unlock\n", __func__);
251 case 0x70: /* Status Register */
252 DPRINTF("%s: Read status register\n", __func__);
255 case 0x98: /* CFI query */
256 DPRINTF("%s: CFI query\n", __func__);
258 case 0xe8: /* Write to buffer */
259 DPRINTF("%s: Write to buffer\n", __func__);
260 pfl->status |= 0x80; /* Ready! */
262 case 0xff: /* Read array mode */
263 DPRINTF("%s: Read array mode\n", __func__);
273 case 0x20: /* Block erase */
275 if (cmd == 0xd0) { /* confirm */
278 } if (cmd == 0xff) { /* read array mode */
285 DPRINTF("%s: block write of %x bytes\n", __func__, cmd);
293 } else if (cmd == 0x01) {
296 } else if (cmd == 0xff) {
299 DPRINTF("%s: Unknown (un)locking command\n", __func__);
307 DPRINTF("%s: leaving query mode\n", __func__);
316 case 0xe8: /* Block write */
318 DPRINTF("%s: block write offset " TARGET_FMT_lx
319 " value %x counter " TARGET_FMT_lx "\n",
320 __func__, offset, value, pfl->counter);
324 pflash_update(pfl, offset, 1);
327 #if defined(TARGET_WORDS_BIGENDIAN)
328 p[offset] = value >> 8;
329 p[offset + 1] = value;
332 p[offset + 1] = value >> 8;
334 pflash_update(pfl, offset, 2);
337 #if defined(TARGET_WORDS_BIGENDIAN)
338 p[offset] = value >> 24;
339 p[offset + 1] = value >> 16;
340 p[offset + 2] = value >> 8;
341 p[offset + 3] = value;
344 p[offset + 1] = value >> 8;
345 p[offset + 2] = value >> 16;
346 p[offset + 3] = value >> 24;
348 pflash_update(pfl, offset, 4);
355 DPRINTF("%s: block write finished\n", __func__);
365 case 3: /* Confirm mode */
367 case 0xe8: /* Block write */
372 DPRINTF("%s: unknown command for \"write block\"\n", __func__);
373 PFLASH_BUG("Write block confirm");
382 /* Should never happen */
383 DPRINTF("%s: invalid write state\n", __func__);
389 printf("%s: Unimplemented flash cmd sequence "
390 "(offset " TARGET_FMT_lx ", wcycle 0x%x cmd 0x%x value 0x%x\n",
391 __func__, offset, pfl->wcycle, pfl->cmd, value);
394 cpu_register_physical_memory(pfl->base, pfl->total_len,
395 pfl->off | IO_MEM_ROMD | pfl->fl_mem);
404 static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
406 return pflash_read(opaque, addr, 1);
409 static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
411 pflash_t *pfl = opaque;
413 return pflash_read(pfl, addr, 2);
416 static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
418 pflash_t *pfl = opaque;
420 return pflash_read(pfl, addr, 4);
423 static void pflash_writeb (void *opaque, target_phys_addr_t addr,
426 pflash_write(opaque, addr, value, 1);
429 static void pflash_writew (void *opaque, target_phys_addr_t addr,
432 pflash_t *pfl = opaque;
434 pflash_write(pfl, addr, value, 2);
437 static void pflash_writel (void *opaque, target_phys_addr_t addr,
440 pflash_t *pfl = opaque;
442 pflash_write(pfl, addr, value, 4);
445 static CPUWriteMemoryFunc *pflash_write_ops[] = {
451 static CPUReadMemoryFunc *pflash_read_ops[] = {
457 /* Count trailing zeroes of a 32 bits quantity */
458 static int ctz32 (uint32_t n)
483 #if 0 /* This is not necessary as n is never 0 */
491 pflash_t *pflash_cfi01_register(target_phys_addr_t base, ram_addr_t off,
492 BlockDriverState *bs, uint32_t sector_len,
493 int nb_blocs, int width,
494 uint16_t id0, uint16_t id1,
495 uint16_t id2, uint16_t id3)
498 target_long total_len;
500 total_len = sector_len * nb_blocs;
502 /* XXX: to be fixed */
504 if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
505 total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
509 pfl = qemu_mallocz(sizeof(pflash_t));
513 pfl->storage = phys_ram_base + off;
514 pfl->fl_mem = cpu_register_io_memory(0,
515 pflash_read_ops, pflash_write_ops, pfl);
517 cpu_register_physical_memory(base, total_len,
518 off | pfl->fl_mem | IO_MEM_ROMD);
522 /* read the initial flash content */
523 bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
525 #if 0 /* XXX: there should be a bit to set up read-only,
526 * the same way the hardware does (with WP pin).
532 pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
534 pfl->sector_len = sector_len;
535 pfl->total_len = total_len;
544 /* Hardcoded CFI table */
546 /* Standard "QRY" string */
547 pfl->cfi_table[0x10] = 'Q';
548 pfl->cfi_table[0x11] = 'R';
549 pfl->cfi_table[0x12] = 'Y';
550 /* Command set (Intel) */
551 pfl->cfi_table[0x13] = 0x01;
552 pfl->cfi_table[0x14] = 0x00;
553 /* Primary extended table address (none) */
554 pfl->cfi_table[0x15] = 0x31;
555 pfl->cfi_table[0x16] = 0x00;
556 /* Alternate command set (none) */
557 pfl->cfi_table[0x17] = 0x00;
558 pfl->cfi_table[0x18] = 0x00;
559 /* Alternate extended table (none) */
560 pfl->cfi_table[0x19] = 0x00;
561 pfl->cfi_table[0x1A] = 0x00;
563 pfl->cfi_table[0x1B] = 0x45;
565 pfl->cfi_table[0x1C] = 0x55;
566 /* Vpp min (no Vpp pin) */
567 pfl->cfi_table[0x1D] = 0x00;
568 /* Vpp max (no Vpp pin) */
569 pfl->cfi_table[0x1E] = 0x00;
571 pfl->cfi_table[0x1F] = 0x07;
572 /* Timeout for min size buffer write */
573 pfl->cfi_table[0x20] = 0x07;
574 /* Typical timeout for block erase */
575 pfl->cfi_table[0x21] = 0x0a;
576 /* Typical timeout for full chip erase (4096 ms) */
577 pfl->cfi_table[0x22] = 0x00;
579 pfl->cfi_table[0x23] = 0x04;
580 /* Max timeout for buffer write */
581 pfl->cfi_table[0x24] = 0x04;
582 /* Max timeout for block erase */
583 pfl->cfi_table[0x25] = 0x04;
584 /* Max timeout for chip erase */
585 pfl->cfi_table[0x26] = 0x00;
587 pfl->cfi_table[0x27] = ctz32(total_len); // + 1;
588 /* Flash device interface (8 & 16 bits) */
589 pfl->cfi_table[0x28] = 0x02;
590 pfl->cfi_table[0x29] = 0x00;
591 /* Max number of bytes in multi-bytes write */
592 pfl->cfi_table[0x2A] = 0x04;
593 pfl->cfi_table[0x2B] = 0x00;
594 /* Number of erase block regions (uniform) */
595 pfl->cfi_table[0x2C] = 0x01;
596 /* Erase block region 1 */
597 pfl->cfi_table[0x2D] = nb_blocs - 1;
598 pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
599 pfl->cfi_table[0x2F] = sector_len >> 8;
600 pfl->cfi_table[0x30] = sector_len >> 16;
603 pfl->cfi_table[0x31] = 'P';
604 pfl->cfi_table[0x32] = 'R';
605 pfl->cfi_table[0x33] = 'I';
607 pfl->cfi_table[0x34] = '1';
608 pfl->cfi_table[0x35] = '1';
610 pfl->cfi_table[0x36] = 0x00;
611 pfl->cfi_table[0x37] = 0x00;
612 pfl->cfi_table[0x38] = 0x00;
613 pfl->cfi_table[0x39] = 0x00;
615 pfl->cfi_table[0x3a] = 0x00;
617 pfl->cfi_table[0x3b] = 0x00;
618 pfl->cfi_table[0x3c] = 0x00;