root / hw / pflash_cfi01.c @ e0bcb9ca
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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, see <http://www.gnu.org/licenses/>.
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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" |
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#include "flash.h" |
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#include "block.h" |
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#include "qemu-timer.h" |
43 |
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#define PFLASH_BUG(fmt, ...) \
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do { \
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printf("PFLASH: Possible BUG - " fmt, ## __VA_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, ...) \
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do { \
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printf("PFLASH: " fmt , ## __VA_ARGS__); \ |
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} while (0) |
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#else
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#define DPRINTF(fmt, ...) do { } while (0) |
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#endif
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struct pflash_t {
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BlockDriverState *bs; |
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target_phys_addr_t base; |
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target_phys_addr_t sector_len; |
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target_phys_addr_t 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_phys_addr_t counter; |
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unsigned int writeblock_size; |
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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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}; |
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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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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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static uint32_t pflash_read (pflash_t *pfl, target_phys_addr_t offset,
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int width)
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{ |
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target_phys_addr_t 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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boff = offset & 0xFF; /* why this here ?? */ |
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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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#if 0
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DPRINTF("%s: reading offset " TARGET_FMT_plx " under cmd %02x width %d\n",
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__func__, offset, pfl->cmd, width);
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#endif
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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 " TARGET_FMT_plx " %02x\n", |
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__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 " TARGET_FMT_plx " %04x\n", |
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__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 " TARGET_FMT_plx " %08x\n", |
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__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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} |
158 |
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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]; |
174 |
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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} |
183 |
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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; |
191 |
/* 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); |
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} |
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} |
198 |
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static inline void pflash_data_write(pflash_t *pfl, target_phys_addr_t offset, |
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uint32_t value, int width)
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{ |
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uint8_t *p = pfl->storage; |
203 |
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DPRINTF("%s: block write offset " TARGET_FMT_plx
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" value %x counter " TARGET_FMT_plx "\n", |
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__func__, offset, value, pfl->counter); |
207 |
switch (width) {
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case 1: |
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p[offset] = value; |
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break;
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case 2: |
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#if defined(TARGET_WORDS_BIGENDIAN)
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p[offset] = value >> 8;
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p[offset + 1] = value;
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#else
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p[offset] = value; |
217 |
p[offset + 1] = value >> 8; |
218 |
#endif
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break;
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case 4: |
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#if defined(TARGET_WORDS_BIGENDIAN)
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p[offset] = value >> 24;
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p[offset + 1] = value >> 16; |
224 |
p[offset + 2] = value >> 8; |
225 |
p[offset + 3] = value;
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#else
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p[offset] = value; |
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p[offset + 1] = value >> 8; |
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p[offset + 2] = value >> 16; |
230 |
p[offset + 3] = value >> 24; |
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#endif
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break;
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} |
234 |
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} |
236 |
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static void pflash_write(pflash_t *pfl, target_phys_addr_t offset, |
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uint32_t value, int width)
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{ |
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uint8_t *p; |
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uint8_t cmd; |
242 |
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cmd = value; |
244 |
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DPRINTF("%s: writing offset " TARGET_FMT_plx " value %08x width %d wcycle 0x%x\n", |
246 |
__func__, offset, value, width, pfl->wcycle); |
247 |
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if (!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); |
251 |
} |
252 |
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switch (pfl->wcycle) {
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case 0: |
255 |
/* read mode */
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switch (cmd) {
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case 0x00: /* ??? */ |
258 |
goto reset_flash;
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case 0x10: /* Single Byte Program */ |
260 |
case 0x40: /* Single Byte Program */ |
261 |
DPRINTF("%s: Single Byte Program\n", __func__);
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break;
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case 0x20: /* Block erase */ |
264 |
p = pfl->storage; |
265 |
offset &= ~(pfl->sector_len - 1);
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DPRINTF("%s: block erase at " TARGET_FMT_plx " bytes " |
268 |
TARGET_FMT_plx "\n",
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__func__, offset, pfl->sector_len); |
270 |
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memset(p + offset, 0xff, pfl->sector_len);
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pflash_update(pfl, offset, pfl->sector_len); |
273 |
pfl->status |= 0x80; /* Ready! */ |
274 |
break;
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275 |
case 0x50: /* Clear status bits */ |
276 |
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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279 |
case 0x60: /* Block (un)lock */ |
280 |
DPRINTF("%s: Block unlock\n", __func__);
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break;
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case 0x70: /* Status Register */ |
283 |
DPRINTF("%s: Read status register\n", __func__);
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pfl->cmd = cmd; |
285 |
return;
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286 |
case 0x98: /* CFI query */ |
287 |
DPRINTF("%s: CFI query\n", __func__);
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break;
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289 |
case 0xe8: /* Write to buffer */ |
290 |
DPRINTF("%s: Write to buffer\n", __func__);
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pfl->status |= 0x80; /* Ready! */ |
292 |
break;
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293 |
case 0xff: /* Read array mode */ |
294 |
DPRINTF("%s: Read array mode\n", __func__);
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goto reset_flash;
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296 |
default:
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297 |
goto error_flash;
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298 |
} |
299 |
pfl->wcycle++; |
300 |
pfl->cmd = cmd; |
301 |
return;
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302 |
case 1: |
303 |
switch (pfl->cmd) {
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304 |
case 0x10: /* Single Byte Program */ |
305 |
case 0x40: /* Single Byte Program */ |
306 |
DPRINTF("%s: Single Byte Program\n", __func__);
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307 |
pflash_data_write(pfl, offset, value, width); |
308 |
pflash_update(pfl, offset, width); |
309 |
pfl->status |= 0x80; /* Ready! */ |
310 |
pfl->wcycle = 0;
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311 |
break;
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312 |
case 0x20: /* Block erase */ |
313 |
case 0x28: |
314 |
if (cmd == 0xd0) { /* confirm */ |
315 |
pfl->wcycle = 0;
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316 |
pfl->status |= 0x80;
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317 |
} else if (cmd == 0xff) { /* read array mode */ |
318 |
goto reset_flash;
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319 |
} else
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320 |
goto error_flash;
|
321 |
|
322 |
break;
|
323 |
case 0xe8: |
324 |
DPRINTF("%s: block write of %x bytes\n", __func__, value);
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325 |
pfl->counter = value; |
326 |
pfl->wcycle++; |
327 |
break;
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328 |
case 0x60: |
329 |
if (cmd == 0xd0) { |
330 |
pfl->wcycle = 0;
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331 |
pfl->status |= 0x80;
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332 |
} else if (cmd == 0x01) { |
333 |
pfl->wcycle = 0;
|
334 |
pfl->status |= 0x80;
|
335 |
} else if (cmd == 0xff) { |
336 |
goto reset_flash;
|
337 |
} else {
|
338 |
DPRINTF("%s: Unknown (un)locking command\n", __func__);
|
339 |
goto reset_flash;
|
340 |
} |
341 |
break;
|
342 |
case 0x98: |
343 |
if (cmd == 0xff) { |
344 |
goto reset_flash;
|
345 |
} else {
|
346 |
DPRINTF("%s: leaving query mode\n", __func__);
|
347 |
} |
348 |
break;
|
349 |
default:
|
350 |
goto error_flash;
|
351 |
} |
352 |
return;
|
353 |
case 2: |
354 |
switch (pfl->cmd) {
|
355 |
case 0xe8: /* Block write */ |
356 |
pflash_data_write(pfl, offset, value, width); |
357 |
|
358 |
pfl->status |= 0x80;
|
359 |
|
360 |
if (!pfl->counter) {
|
361 |
target_phys_addr_t mask = pfl->writeblock_size - 1;
|
362 |
mask = ~mask; |
363 |
|
364 |
DPRINTF("%s: block write finished\n", __func__);
|
365 |
pfl->wcycle++; |
366 |
/* Flush the entire write buffer onto backing storage. */
|
367 |
pflash_update(pfl, offset & mask, pfl->writeblock_size); |
368 |
} |
369 |
|
370 |
pfl->counter--; |
371 |
break;
|
372 |
default:
|
373 |
goto error_flash;
|
374 |
} |
375 |
return;
|
376 |
case 3: /* Confirm mode */ |
377 |
switch (pfl->cmd) {
|
378 |
case 0xe8: /* Block write */ |
379 |
if (cmd == 0xd0) { |
380 |
pfl->wcycle = 0;
|
381 |
pfl->status |= 0x80;
|
382 |
} else {
|
383 |
DPRINTF("%s: unknown command for \"write block\"\n", __func__);
|
384 |
PFLASH_BUG("Write block confirm");
|
385 |
goto reset_flash;
|
386 |
} |
387 |
break;
|
388 |
default:
|
389 |
goto error_flash;
|
390 |
} |
391 |
return;
|
392 |
default:
|
393 |
/* Should never happen */
|
394 |
DPRINTF("%s: invalid write state\n", __func__);
|
395 |
goto reset_flash;
|
396 |
} |
397 |
return;
|
398 |
|
399 |
error_flash:
|
400 |
printf("%s: Unimplemented flash cmd sequence "
|
401 |
"(offset " TARGET_FMT_plx ", wcycle 0x%x cmd 0x%x value 0x%x)\n", |
402 |
__func__, offset, pfl->wcycle, pfl->cmd, value); |
403 |
|
404 |
reset_flash:
|
405 |
cpu_register_physical_memory(pfl->base, pfl->total_len, |
406 |
pfl->off | IO_MEM_ROMD | pfl->fl_mem); |
407 |
|
408 |
pfl->bypass = 0;
|
409 |
pfl->wcycle = 0;
|
410 |
pfl->cmd = 0;
|
411 |
return;
|
412 |
} |
413 |
|
414 |
|
415 |
static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr) |
416 |
{ |
417 |
return pflash_read(opaque, addr, 1); |
418 |
} |
419 |
|
420 |
static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr) |
421 |
{ |
422 |
pflash_t *pfl = opaque; |
423 |
|
424 |
return pflash_read(pfl, addr, 2); |
425 |
} |
426 |
|
427 |
static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr) |
428 |
{ |
429 |
pflash_t *pfl = opaque; |
430 |
|
431 |
return pflash_read(pfl, addr, 4); |
432 |
} |
433 |
|
434 |
static void pflash_writeb (void *opaque, target_phys_addr_t addr, |
435 |
uint32_t value) |
436 |
{ |
437 |
pflash_write(opaque, addr, value, 1);
|
438 |
} |
439 |
|
440 |
static void pflash_writew (void *opaque, target_phys_addr_t addr, |
441 |
uint32_t value) |
442 |
{ |
443 |
pflash_t *pfl = opaque; |
444 |
|
445 |
pflash_write(pfl, addr, value, 2);
|
446 |
} |
447 |
|
448 |
static void pflash_writel (void *opaque, target_phys_addr_t addr, |
449 |
uint32_t value) |
450 |
{ |
451 |
pflash_t *pfl = opaque; |
452 |
|
453 |
pflash_write(pfl, addr, value, 4);
|
454 |
} |
455 |
|
456 |
static CPUWriteMemoryFunc * const pflash_write_ops[] = { |
457 |
&pflash_writeb, |
458 |
&pflash_writew, |
459 |
&pflash_writel, |
460 |
}; |
461 |
|
462 |
static CPUReadMemoryFunc * const pflash_read_ops[] = { |
463 |
&pflash_readb, |
464 |
&pflash_readw, |
465 |
&pflash_readl, |
466 |
}; |
467 |
|
468 |
/* Count trailing zeroes of a 32 bits quantity */
|
469 |
static int ctz32 (uint32_t n) |
470 |
{ |
471 |
int ret;
|
472 |
|
473 |
ret = 0;
|
474 |
if (!(n & 0xFFFF)) { |
475 |
ret += 16;
|
476 |
n = n >> 16;
|
477 |
} |
478 |
if (!(n & 0xFF)) { |
479 |
ret += 8;
|
480 |
n = n >> 8;
|
481 |
} |
482 |
if (!(n & 0xF)) { |
483 |
ret += 4;
|
484 |
n = n >> 4;
|
485 |
} |
486 |
if (!(n & 0x3)) { |
487 |
ret += 2;
|
488 |
n = n >> 2;
|
489 |
} |
490 |
if (!(n & 0x1)) { |
491 |
ret++; |
492 |
n = n >> 1;
|
493 |
} |
494 |
#if 0 /* This is not necessary as n is never 0 */
|
495 |
if (!n)
|
496 |
ret++;
|
497 |
#endif
|
498 |
|
499 |
return ret;
|
500 |
} |
501 |
|
502 |
pflash_t *pflash_cfi01_register(target_phys_addr_t base, ram_addr_t off, |
503 |
BlockDriverState *bs, uint32_t sector_len, |
504 |
int nb_blocs, int width, |
505 |
uint16_t id0, uint16_t id1, |
506 |
uint16_t id2, uint16_t id3) |
507 |
{ |
508 |
pflash_t *pfl; |
509 |
target_phys_addr_t total_len; |
510 |
int ret;
|
511 |
|
512 |
total_len = sector_len * nb_blocs; |
513 |
|
514 |
/* XXX: to be fixed */
|
515 |
#if 0
|
516 |
if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
|
517 |
total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
|
518 |
return NULL;
|
519 |
#endif
|
520 |
|
521 |
pfl = qemu_mallocz(sizeof(pflash_t));
|
522 |
|
523 |
/* FIXME: Allocate ram ourselves. */
|
524 |
pfl->storage = qemu_get_ram_ptr(off); |
525 |
pfl->fl_mem = cpu_register_io_memory( |
526 |
pflash_read_ops, pflash_write_ops, pfl); |
527 |
pfl->off = off; |
528 |
cpu_register_physical_memory(base, total_len, |
529 |
off | pfl->fl_mem | IO_MEM_ROMD); |
530 |
|
531 |
pfl->bs = bs; |
532 |
if (pfl->bs) {
|
533 |
/* read the initial flash content */
|
534 |
ret = bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9); |
535 |
if (ret < 0) { |
536 |
cpu_unregister_io_memory(pfl->fl_mem); |
537 |
qemu_free(pfl); |
538 |
return NULL; |
539 |
} |
540 |
} |
541 |
#if 0 /* XXX: there should be a bit to set up read-only,
|
542 |
* the same way the hardware does (with WP pin).
|
543 |
*/
|
544 |
pfl->ro = 1;
|
545 |
#else
|
546 |
pfl->ro = 0;
|
547 |
#endif
|
548 |
pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl); |
549 |
pfl->base = base; |
550 |
pfl->sector_len = sector_len; |
551 |
pfl->total_len = total_len; |
552 |
pfl->width = width; |
553 |
pfl->wcycle = 0;
|
554 |
pfl->cmd = 0;
|
555 |
pfl->status = 0;
|
556 |
pfl->ident[0] = id0;
|
557 |
pfl->ident[1] = id1;
|
558 |
pfl->ident[2] = id2;
|
559 |
pfl->ident[3] = id3;
|
560 |
/* Hardcoded CFI table */
|
561 |
pfl->cfi_len = 0x52;
|
562 |
/* Standard "QRY" string */
|
563 |
pfl->cfi_table[0x10] = 'Q'; |
564 |
pfl->cfi_table[0x11] = 'R'; |
565 |
pfl->cfi_table[0x12] = 'Y'; |
566 |
/* Command set (Intel) */
|
567 |
pfl->cfi_table[0x13] = 0x01; |
568 |
pfl->cfi_table[0x14] = 0x00; |
569 |
/* Primary extended table address (none) */
|
570 |
pfl->cfi_table[0x15] = 0x31; |
571 |
pfl->cfi_table[0x16] = 0x00; |
572 |
/* Alternate command set (none) */
|
573 |
pfl->cfi_table[0x17] = 0x00; |
574 |
pfl->cfi_table[0x18] = 0x00; |
575 |
/* Alternate extended table (none) */
|
576 |
pfl->cfi_table[0x19] = 0x00; |
577 |
pfl->cfi_table[0x1A] = 0x00; |
578 |
/* Vcc min */
|
579 |
pfl->cfi_table[0x1B] = 0x45; |
580 |
/* Vcc max */
|
581 |
pfl->cfi_table[0x1C] = 0x55; |
582 |
/* Vpp min (no Vpp pin) */
|
583 |
pfl->cfi_table[0x1D] = 0x00; |
584 |
/* Vpp max (no Vpp pin) */
|
585 |
pfl->cfi_table[0x1E] = 0x00; |
586 |
/* Reserved */
|
587 |
pfl->cfi_table[0x1F] = 0x07; |
588 |
/* Timeout for min size buffer write */
|
589 |
pfl->cfi_table[0x20] = 0x07; |
590 |
/* Typical timeout for block erase */
|
591 |
pfl->cfi_table[0x21] = 0x0a; |
592 |
/* Typical timeout for full chip erase (4096 ms) */
|
593 |
pfl->cfi_table[0x22] = 0x00; |
594 |
/* Reserved */
|
595 |
pfl->cfi_table[0x23] = 0x04; |
596 |
/* Max timeout for buffer write */
|
597 |
pfl->cfi_table[0x24] = 0x04; |
598 |
/* Max timeout for block erase */
|
599 |
pfl->cfi_table[0x25] = 0x04; |
600 |
/* Max timeout for chip erase */
|
601 |
pfl->cfi_table[0x26] = 0x00; |
602 |
/* Device size */
|
603 |
pfl->cfi_table[0x27] = ctz32(total_len); // + 1; |
604 |
/* Flash device interface (8 & 16 bits) */
|
605 |
pfl->cfi_table[0x28] = 0x02; |
606 |
pfl->cfi_table[0x29] = 0x00; |
607 |
/* Max number of bytes in multi-bytes write */
|
608 |
if (width == 1) { |
609 |
pfl->cfi_table[0x2A] = 0x08; |
610 |
} else {
|
611 |
pfl->cfi_table[0x2A] = 0x0B; |
612 |
} |
613 |
pfl->writeblock_size = 1 << pfl->cfi_table[0x2A]; |
614 |
|
615 |
pfl->cfi_table[0x2B] = 0x00; |
616 |
/* Number of erase block regions (uniform) */
|
617 |
pfl->cfi_table[0x2C] = 0x01; |
618 |
/* Erase block region 1 */
|
619 |
pfl->cfi_table[0x2D] = nb_blocs - 1; |
620 |
pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8; |
621 |
pfl->cfi_table[0x2F] = sector_len >> 8; |
622 |
pfl->cfi_table[0x30] = sector_len >> 16; |
623 |
|
624 |
/* Extended */
|
625 |
pfl->cfi_table[0x31] = 'P'; |
626 |
pfl->cfi_table[0x32] = 'R'; |
627 |
pfl->cfi_table[0x33] = 'I'; |
628 |
|
629 |
pfl->cfi_table[0x34] = '1'; |
630 |
pfl->cfi_table[0x35] = '1'; |
631 |
|
632 |
pfl->cfi_table[0x36] = 0x00; |
633 |
pfl->cfi_table[0x37] = 0x00; |
634 |
pfl->cfi_table[0x38] = 0x00; |
635 |
pfl->cfi_table[0x39] = 0x00; |
636 |
|
637 |
pfl->cfi_table[0x3a] = 0x00; |
638 |
|
639 |
pfl->cfi_table[0x3b] = 0x00; |
640 |
pfl->cfi_table[0x3c] = 0x00; |
641 |
|
642 |
return pfl;
|
643 |
} |