root / hw / pflash_cfi01.c @ 87ecb68b
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/*
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* CFI parallel flash with Intel command set emulation
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*
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* Copyright (c) 2006 Thorsten Zitterell
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* Copyright (c) 2005 Jocelyn Mayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* For now, this code can emulate flashes of 1, 2 or 4 bytes width.
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* Supported commands/modes are:
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* - flash read
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* - flash write
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* - flash ID read
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* - sector erase
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* - CFI queries
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*
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* It does not support timings
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* It does not support flash interleaving
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* It does not implement software data protection as found in many real chips
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* It does not implement erase suspend/resume commands
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* It does not implement multiple sectors erase
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*
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* It does not implement much more ...
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*/
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#include "hw.h" |
| 41 |
#include "flash.h" |
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#include "block.h" |
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#include "qemu-timer.h" |
| 44 |
|
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#define PFLASH_BUG(fmt, args...) \
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do { \
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printf("PFLASH: Possible BUG - " fmt, ##args); \ |
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exit(1); \
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} while(0) |
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|
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/* #define PFLASH_DEBUG */
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#ifdef PFLASH_DEBUG
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#define DPRINTF(fmt, args...) \
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do { \
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printf("PFLASH: " fmt , ##args); \ |
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} while (0) |
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#else
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#define DPRINTF(fmt, args...) do { } while (0) |
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#endif
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|
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struct pflash_t {
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BlockDriverState *bs; |
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target_ulong base; |
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target_ulong sector_len; |
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target_ulong total_len; |
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int width;
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int wcycle; /* if 0, the flash is read normally */ |
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int bypass;
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int ro;
|
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uint8_t cmd; |
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uint8_t status; |
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uint16_t ident[4];
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uint8_t cfi_len; |
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uint8_t cfi_table[0x52];
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target_ulong counter; |
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QEMUTimer *timer; |
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ram_addr_t off; |
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int fl_mem;
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void *storage;
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}; |
| 81 |
|
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static void pflash_timer (void *opaque) |
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{
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pflash_t *pfl = opaque; |
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|
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DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
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/* Reset flash */
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pfl->status ^= 0x80;
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if (pfl->bypass) {
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pfl->wcycle = 2;
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} else {
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cpu_register_physical_memory(pfl->base, pfl->total_len, |
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pfl->off | IO_MEM_ROMD | pfl->fl_mem); |
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pfl->wcycle = 0;
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} |
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pfl->cmd = 0;
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} |
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|
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static uint32_t pflash_read (pflash_t *pfl, target_ulong offset, int width) |
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{
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target_ulong boff; |
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uint32_t ret; |
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uint8_t *p; |
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ret = -1;
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offset -= pfl->base; |
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boff = offset & 0xFF; /* why this here ?? */ |
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|
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if (pfl->width == 2) |
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boff = boff >> 1;
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else if (pfl->width == 4) |
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boff = boff >> 2;
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|
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DPRINTF("%s: reading offset %08x under cmd %02x\n",
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__func__, boff, pfl->cmd); |
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|
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switch (pfl->cmd) {
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case 0x00: |
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/* Flash area read */
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p = pfl->storage; |
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switch (width) {
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case 1: |
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ret = p[offset]; |
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DPRINTF("%s: data offset %08x %02x\n", __func__, offset, ret);
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break;
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case 2: |
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#if defined(TARGET_WORDS_BIGENDIAN)
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ret = p[offset] << 8;
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ret |= p[offset + 1];
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#else
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ret = p[offset]; |
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ret |= p[offset + 1] << 8; |
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#endif
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DPRINTF("%s: data offset %08x %04x\n", __func__, offset, ret);
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break;
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case 4: |
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#if defined(TARGET_WORDS_BIGENDIAN)
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ret = p[offset] << 24;
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ret |= p[offset + 1] << 16; |
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ret |= p[offset + 2] << 8; |
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ret |= p[offset + 3];
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#else
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ret = p[offset]; |
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ret |= p[offset + 1] << 8; |
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ret |= p[offset + 1] << 8; |
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ret |= p[offset + 2] << 16; |
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ret |= p[offset + 3] << 24; |
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#endif
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DPRINTF("%s: data offset %08x %08x\n", __func__, offset, ret);
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break;
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default:
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DPRINTF("BUG in %s\n", __func__);
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} |
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break;
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case 0x20: /* Block erase */ |
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case 0x50: /* Clear status register */ |
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case 0x60: /* Block /un)lock */ |
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case 0x70: /* Status Register */ |
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case 0xe8: /* Write block */ |
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/* Status register read */
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ret = pfl->status; |
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DPRINTF("%s: status %x\n", __func__, ret);
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break;
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case 0x98: /* Query mode */ |
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if (boff > pfl->cfi_len)
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ret = 0;
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else
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ret = pfl->cfi_table[boff]; |
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break;
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default:
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/* This should never happen : reset state & treat it as a read */
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DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
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pfl->wcycle = 0;
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pfl->cmd = 0;
|
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} |
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return ret;
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} |
| 179 |
|
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/* update flash content on disk */
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static void pflash_update(pflash_t *pfl, int offset, |
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int size)
|
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{
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int offset_end;
|
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if (pfl->bs) {
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offset_end = offset + size; |
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/* round to sectors */
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offset = offset >> 9;
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offset_end = (offset_end + 511) >> 9; |
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bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
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offset_end - offset); |
| 192 |
} |
| 193 |
} |
| 194 |
|
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static void pflash_write (pflash_t *pfl, target_ulong offset, uint32_t value, |
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int width)
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{
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target_ulong boff; |
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uint8_t *p; |
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uint8_t cmd; |
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/* WARNING: when the memory area is in ROMD mode, the offset is a
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ram offset, not a physical address */
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cmd = value; |
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if (pfl->wcycle == 0) |
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offset -= (target_ulong)(long)pfl->storage;
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else
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offset -= pfl->base; |
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DPRINTF("%s: offset %08x %08x %d wcycle 0x%x\n",
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__func__, offset, value, width, pfl->wcycle); |
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/* Set the device in I/O access mode */
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cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem); |
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boff = offset & (pfl->sector_len - 1);
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|
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if (pfl->width == 2) |
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boff = boff >> 1;
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else if (pfl->width == 4) |
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boff = boff >> 2;
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switch (pfl->wcycle) {
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case 0: |
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/* read mode */
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switch (cmd) {
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case 0x00: /* ??? */ |
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goto reset_flash;
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case 0x20: /* Block erase */ |
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p = pfl->storage; |
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offset &= ~(pfl->sector_len - 1);
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DPRINTF("%s: block erase at 0x%x bytes 0x%x\n", __func__,
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offset, pfl->sector_len); |
| 235 |
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memset(p + offset, 0xff, pfl->sector_len);
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pflash_update(pfl, offset, pfl->sector_len); |
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pfl->status |= 0x80; /* Ready! */ |
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break;
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case 0x50: /* Clear status bits */ |
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DPRINTF("%s: Clear status bits\n", __func__);
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pfl->status = 0x0;
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goto reset_flash;
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case 0x60: /* Block (un)lock */ |
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DPRINTF("%s: Block unlock\n", __func__);
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break;
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case 0x70: /* Status Register */ |
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DPRINTF("%s: Read status register\n", __func__);
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pfl->cmd = cmd; |
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return;
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case 0x98: /* CFI query */ |
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DPRINTF("%s: CFI query\n", __func__);
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break;
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case 0xe8: /* Write to buffer */ |
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DPRINTF("%s: Write to buffer\n", __func__);
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pfl->status |= 0x80; /* Ready! */ |
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break;
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case 0xff: /* Read array mode */ |
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DPRINTF("%s: Read array mode\n", __func__);
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goto reset_flash;
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default:
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goto error_flash;
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} |
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pfl->wcycle++; |
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pfl->cmd = cmd; |
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return;
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case 1: |
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switch (pfl->cmd) {
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case 0x20: /* Block erase */ |
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case 0x28: |
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if (cmd == 0xd0) { /* confirm */ |
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pfl->wcycle = 1;
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pfl->status |= 0x80;
|
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} if (cmd == 0xff) { /* read array mode */ |
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goto reset_flash;
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} else
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goto error_flash;
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|
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break;
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case 0xe8: |
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DPRINTF("%s: block write of 0x%x bytes\n", __func__, cmd);
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pfl->counter = cmd; |
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pfl->wcycle++; |
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break;
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case 0x60: |
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if (cmd == 0xd0) { |
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pfl->wcycle = 0;
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pfl->status |= 0x80;
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} else if (cmd == 0x01) { |
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pfl->wcycle = 0;
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pfl->status |= 0x80;
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} else if (cmd == 0xff) { |
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goto reset_flash;
|
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} else {
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DPRINTF("%s: Unknown (un)locking command\n", __func__);
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goto reset_flash;
|
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} |
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break;
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| 299 |
case 0x98: |
| 300 |
if (cmd == 0xff) { |
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goto reset_flash;
|
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} else {
|
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DPRINTF("%s: leaving query mode\n", __func__);
|
| 304 |
} |
| 305 |
break;
|
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default:
|
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goto error_flash;
|
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} |
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return;
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case 2: |
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switch (pfl->cmd) {
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case 0xe8: /* Block write */ |
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p = pfl->storage; |
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DPRINTF("%s: block write offset 0x%x value 0x%x counter 0x%x\n",
|
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__func__, offset, value, pfl->counter); |
| 316 |
switch (width) {
|
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case 1: |
| 318 |
p[offset] = value; |
| 319 |
pflash_update(pfl, offset, 1);
|
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break;
|
| 321 |
case 2: |
| 322 |
#if defined(TARGET_WORDS_BIGENDIAN)
|
| 323 |
p[offset] = value >> 8;
|
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p[offset + 1] = value;
|
| 325 |
#else
|
| 326 |
p[offset] = value; |
| 327 |
p[offset + 1] = value >> 8; |
| 328 |
#endif
|
| 329 |
pflash_update(pfl, offset, 2);
|
| 330 |
break;
|
| 331 |
case 4: |
| 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;
|
| 337 |
#else
|
| 338 |
p[offset] = value; |
| 339 |
p[offset + 1] = value >> 8; |
| 340 |
p[offset + 2] = value >> 16; |
| 341 |
p[offset + 3] = value >> 24; |
| 342 |
#endif
|
| 343 |
pflash_update(pfl, offset, 4);
|
| 344 |
break;
|
| 345 |
} |
| 346 |
|
| 347 |
pfl->status |= 0x80;
|
| 348 |
|
| 349 |
if (!pfl->counter) {
|
| 350 |
DPRINTF("%s: block write finished\n", __func__);
|
| 351 |
pfl->wcycle++; |
| 352 |
} |
| 353 |
|
| 354 |
pfl->counter--; |
| 355 |
break;
|
| 356 |
} |
| 357 |
return;
|
| 358 |
case 3: /* Confirm mode */ |
| 359 |
switch (pfl->cmd) {
|
| 360 |
case 0xe8: /* Block write */ |
| 361 |
if (cmd == 0xd0) { |
| 362 |
pfl->wcycle = 0;
|
| 363 |
pfl->status |= 0x80;
|
| 364 |
break;
|
| 365 |
} else {
|
| 366 |
DPRINTF("%s: unknown command for \"write block\"\n", __func__);
|
| 367 |
PFLASH_BUG("Write block confirm");
|
| 368 |
} |
| 369 |
} |
| 370 |
return;
|
| 371 |
default:
|
| 372 |
/* Should never happen */
|
| 373 |
DPRINTF("%s: invalid write state\n", __func__);
|
| 374 |
goto reset_flash;
|
| 375 |
} |
| 376 |
return;
|
| 377 |
|
| 378 |
error_flash:
|
| 379 |
printf("%s: Unimplemented flash cmd sequence "
|
| 380 |
"(offset 0x%x, wcycle 0x%x cmd 0x%x value 0x%x\n",
|
| 381 |
__func__, offset, pfl->wcycle, pfl->cmd, value); |
| 382 |
|
| 383 |
reset_flash:
|
| 384 |
cpu_register_physical_memory(pfl->base, pfl->total_len, |
| 385 |
pfl->off | IO_MEM_ROMD | pfl->fl_mem); |
| 386 |
|
| 387 |
pfl->bypass = 0;
|
| 388 |
pfl->wcycle = 0;
|
| 389 |
pfl->cmd = 0;
|
| 390 |
return;
|
| 391 |
} |
| 392 |
|
| 393 |
|
| 394 |
static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr) |
| 395 |
{
|
| 396 |
return pflash_read(opaque, addr, 1); |
| 397 |
} |
| 398 |
|
| 399 |
static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr) |
| 400 |
{
|
| 401 |
pflash_t *pfl = opaque; |
| 402 |
|
| 403 |
return pflash_read(pfl, addr, 2); |
| 404 |
} |
| 405 |
|
| 406 |
static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr) |
| 407 |
{
|
| 408 |
pflash_t *pfl = opaque; |
| 409 |
|
| 410 |
return pflash_read(pfl, addr, 4); |
| 411 |
} |
| 412 |
|
| 413 |
static void pflash_writeb (void *opaque, target_phys_addr_t addr, |
| 414 |
uint32_t value) |
| 415 |
{
|
| 416 |
pflash_write(opaque, addr, value, 1);
|
| 417 |
} |
| 418 |
|
| 419 |
static void pflash_writew (void *opaque, target_phys_addr_t addr, |
| 420 |
uint32_t value) |
| 421 |
{
|
| 422 |
pflash_t *pfl = opaque; |
| 423 |
|
| 424 |
pflash_write(pfl, addr, value, 2);
|
| 425 |
} |
| 426 |
|
| 427 |
static void pflash_writel (void *opaque, target_phys_addr_t addr, |
| 428 |
uint32_t value) |
| 429 |
{
|
| 430 |
pflash_t *pfl = opaque; |
| 431 |
|
| 432 |
pflash_write(pfl, addr, value, 4);
|
| 433 |
} |
| 434 |
|
| 435 |
static CPUWriteMemoryFunc *pflash_write_ops[] = {
|
| 436 |
&pflash_writeb, |
| 437 |
&pflash_writew, |
| 438 |
&pflash_writel, |
| 439 |
}; |
| 440 |
|
| 441 |
static CPUReadMemoryFunc *pflash_read_ops[] = {
|
| 442 |
&pflash_readb, |
| 443 |
&pflash_readw, |
| 444 |
&pflash_readl, |
| 445 |
}; |
| 446 |
|
| 447 |
/* Count trailing zeroes of a 32 bits quantity */
|
| 448 |
static int ctz32 (uint32_t n) |
| 449 |
{
|
| 450 |
int ret;
|
| 451 |
|
| 452 |
ret = 0;
|
| 453 |
if (!(n & 0xFFFF)) { |
| 454 |
ret += 16;
|
| 455 |
n = n >> 16;
|
| 456 |
} |
| 457 |
if (!(n & 0xFF)) { |
| 458 |
ret += 8;
|
| 459 |
n = n >> 8;
|
| 460 |
} |
| 461 |
if (!(n & 0xF)) { |
| 462 |
ret += 4;
|
| 463 |
n = n >> 4;
|
| 464 |
} |
| 465 |
if (!(n & 0x3)) { |
| 466 |
ret += 2;
|
| 467 |
n = n >> 2;
|
| 468 |
} |
| 469 |
if (!(n & 0x1)) { |
| 470 |
ret++; |
| 471 |
n = n >> 1;
|
| 472 |
} |
| 473 |
#if 0 /* This is not necessary as n is never 0 */
|
| 474 |
if (!n)
|
| 475 |
ret++;
|
| 476 |
#endif
|
| 477 |
|
| 478 |
return ret;
|
| 479 |
} |
| 480 |
|
| 481 |
pflash_t *pflash_register (target_phys_addr_t base, ram_addr_t off, |
| 482 |
BlockDriverState *bs, |
| 483 |
target_ulong sector_len, int nb_blocs, int width, |
| 484 |
uint16_t id0, uint16_t id1, |
| 485 |
uint16_t id2, uint16_t id3) |
| 486 |
{
|
| 487 |
pflash_t *pfl; |
| 488 |
target_long total_len; |
| 489 |
|
| 490 |
total_len = sector_len * nb_blocs; |
| 491 |
|
| 492 |
/* XXX: to be fixed */
|
| 493 |
if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) && |
| 494 |
total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024)) |
| 495 |
return NULL; |
| 496 |
|
| 497 |
pfl = qemu_mallocz(sizeof(pflash_t));
|
| 498 |
|
| 499 |
if (pfl == NULL) |
| 500 |
return NULL; |
| 501 |
pfl->storage = phys_ram_base + off; |
| 502 |
pfl->fl_mem = cpu_register_io_memory(0,
|
| 503 |
pflash_read_ops, pflash_write_ops, pfl); |
| 504 |
pfl->off = off; |
| 505 |
cpu_register_physical_memory(base, total_len, |
| 506 |
off | pfl->fl_mem | IO_MEM_ROMD); |
| 507 |
|
| 508 |
pfl->bs = bs; |
| 509 |
if (pfl->bs) {
|
| 510 |
/* read the initial flash content */
|
| 511 |
bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9); |
| 512 |
} |
| 513 |
#if 0 /* XXX: there should be a bit to set up read-only,
|
| 514 |
* the same way the hardware does (with WP pin).
|
| 515 |
*/
|
| 516 |
pfl->ro = 1;
|
| 517 |
#else
|
| 518 |
pfl->ro = 0;
|
| 519 |
#endif
|
| 520 |
pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl); |
| 521 |
pfl->base = base; |
| 522 |
pfl->sector_len = sector_len; |
| 523 |
pfl->total_len = total_len; |
| 524 |
pfl->width = width; |
| 525 |
pfl->wcycle = 0;
|
| 526 |
pfl->cmd = 0;
|
| 527 |
pfl->status = 0;
|
| 528 |
pfl->ident[0] = id0;
|
| 529 |
pfl->ident[1] = id1;
|
| 530 |
pfl->ident[2] = id2;
|
| 531 |
pfl->ident[3] = id3;
|
| 532 |
/* Hardcoded CFI table */
|
| 533 |
pfl->cfi_len = 0x52;
|
| 534 |
/* Standard "QRY" string */
|
| 535 |
pfl->cfi_table[0x10] = 'Q'; |
| 536 |
pfl->cfi_table[0x11] = 'R'; |
| 537 |
pfl->cfi_table[0x12] = 'Y'; |
| 538 |
/* Command set (Intel) */
|
| 539 |
pfl->cfi_table[0x13] = 0x01; |
| 540 |
pfl->cfi_table[0x14] = 0x00; |
| 541 |
/* Primary extended table address (none) */
|
| 542 |
pfl->cfi_table[0x15] = 0x31; |
| 543 |
pfl->cfi_table[0x16] = 0x00; |
| 544 |
/* Alternate command set (none) */
|
| 545 |
pfl->cfi_table[0x17] = 0x00; |
| 546 |
pfl->cfi_table[0x18] = 0x00; |
| 547 |
/* Alternate extended table (none) */
|
| 548 |
pfl->cfi_table[0x19] = 0x00; |
| 549 |
pfl->cfi_table[0x1A] = 0x00; |
| 550 |
/* Vcc min */
|
| 551 |
pfl->cfi_table[0x1B] = 0x45; |
| 552 |
/* Vcc max */
|
| 553 |
pfl->cfi_table[0x1C] = 0x55; |
| 554 |
/* Vpp min (no Vpp pin) */
|
| 555 |
pfl->cfi_table[0x1D] = 0x00; |
| 556 |
/* Vpp max (no Vpp pin) */
|
| 557 |
pfl->cfi_table[0x1E] = 0x00; |
| 558 |
/* Reserved */
|
| 559 |
pfl->cfi_table[0x1F] = 0x07; |
| 560 |
/* Timeout for min size buffer write */
|
| 561 |
pfl->cfi_table[0x20] = 0x07; |
| 562 |
/* Typical timeout for block erase */
|
| 563 |
pfl->cfi_table[0x21] = 0x0a; |
| 564 |
/* Typical timeout for full chip erase (4096 ms) */
|
| 565 |
pfl->cfi_table[0x22] = 0x00; |
| 566 |
/* Reserved */
|
| 567 |
pfl->cfi_table[0x23] = 0x04; |
| 568 |
/* Max timeout for buffer write */
|
| 569 |
pfl->cfi_table[0x24] = 0x04; |
| 570 |
/* Max timeout for block erase */
|
| 571 |
pfl->cfi_table[0x25] = 0x04; |
| 572 |
/* Max timeout for chip erase */
|
| 573 |
pfl->cfi_table[0x26] = 0x00; |
| 574 |
/* Device size */
|
| 575 |
pfl->cfi_table[0x27] = ctz32(total_len); // + 1; |
| 576 |
/* Flash device interface (8 & 16 bits) */
|
| 577 |
pfl->cfi_table[0x28] = 0x02; |
| 578 |
pfl->cfi_table[0x29] = 0x00; |
| 579 |
/* Max number of bytes in multi-bytes write */
|
| 580 |
pfl->cfi_table[0x2A] = 0x04; |
| 581 |
pfl->cfi_table[0x2B] = 0x00; |
| 582 |
/* Number of erase block regions (uniform) */
|
| 583 |
pfl->cfi_table[0x2C] = 0x01; |
| 584 |
/* Erase block region 1 */
|
| 585 |
pfl->cfi_table[0x2D] = nb_blocs - 1; |
| 586 |
pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8; |
| 587 |
pfl->cfi_table[0x2F] = sector_len >> 8; |
| 588 |
pfl->cfi_table[0x30] = sector_len >> 16; |
| 589 |
|
| 590 |
/* Extended */
|
| 591 |
pfl->cfi_table[0x31] = 'P'; |
| 592 |
pfl->cfi_table[0x32] = 'R'; |
| 593 |
pfl->cfi_table[0x33] = 'I'; |
| 594 |
|
| 595 |
pfl->cfi_table[0x34] = '1'; |
| 596 |
pfl->cfi_table[0x35] = '1'; |
| 597 |
|
| 598 |
pfl->cfi_table[0x36] = 0x00; |
| 599 |
pfl->cfi_table[0x37] = 0x00; |
| 600 |
pfl->cfi_table[0x38] = 0x00; |
| 601 |
pfl->cfi_table[0x39] = 0x00; |
| 602 |
|
| 603 |
pfl->cfi_table[0x3a] = 0x00; |
| 604 |
|
| 605 |
pfl->cfi_table[0x3b] = 0x00; |
| 606 |
pfl->cfi_table[0x3c] = 0x00; |
| 607 |
|
| 608 |
return pfl;
|
| 609 |
} |