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qemu/hw/pflash_cfi01.c
balrog 71fb234866 Increase write buffer size in pflash emulation (Thomas Petazzoni). 
The current flash emulation code advertises a write buffer size of 16
bytes (1 << 4, according to offset 0x2A of the CFI table). This is
very small compared to normal write buffer sizes, and makes the
process of writing to the flash very slow (at least from U-Boot).

This patch increases this size to 2048 bytes. Except the modification
of the CFI table, the only other required modification is to use
"value" instead of "cmd" to set pfl->counter, because cmd is truncated
to the 8 lower bits of value, while the number of bytes for a write
can now be greater than 255 bytes.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5454 c046a42c-6fe2-441c-8c8c-71466251a162
2008-10-11 09:19:57 +00:00

616 lines
17 KiB
C
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/*
* CFI parallel flash with Intel command set emulation
*
* Copyright (c) 2006 Thorsten Zitterell
* Copyright (c) 2005 Jocelyn Mayer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* For now, this code can emulate flashes of 1, 2 or 4 bytes width.
* Supported commands/modes are:
* - flash read
* - flash write
* - flash ID read
* - sector erase
* - CFI queries
*
* It does not support timings
* It does not support flash interleaving
* It does not implement software data protection as found in many real chips
* It does not implement erase suspend/resume commands
* It does not implement multiple sectors erase
*
* It does not implement much more ...
*/
#include "hw.h"
#include "flash.h"
#include "block.h"
#include "qemu-timer.h"
#define PFLASH_BUG(fmt, args...) \
do { \
printf("PFLASH: Possible BUG - " fmt, ##args); \
exit(1); \
} while(0)
/* #define PFLASH_DEBUG */
#ifdef PFLASH_DEBUG
#define DPRINTF(fmt, args...) \
do { \
printf("PFLASH: " fmt , ##args); \
} while (0)
#else
#define DPRINTF(fmt, args...) do { } while (0)
#endif
struct pflash_t {
BlockDriverState *bs;
target_ulong base;
target_ulong sector_len;
target_ulong total_len;
int width;
int wcycle; /* if 0, the flash is read normally */
int bypass;
int ro;
uint8_t cmd;
uint8_t status;
uint16_t ident[4];
uint8_t cfi_len;
uint8_t cfi_table[0x52];
target_ulong counter;
QEMUTimer *timer;
ram_addr_t off;
int fl_mem;
void *storage;
};
static void pflash_timer (void *opaque)
{
pflash_t *pfl = opaque;
DPRINTF("%s: command %02x done\n", __func__, pfl->cmd);
/* Reset flash */
pfl->status ^= 0x80;
if (pfl->bypass) {
pfl->wcycle = 2;
} else {
cpu_register_physical_memory(pfl->base, pfl->total_len,
pfl->off | IO_MEM_ROMD | pfl->fl_mem);
pfl->wcycle = 0;
}
pfl->cmd = 0;
}
static uint32_t pflash_read (pflash_t *pfl, target_ulong offset, int width)
{
target_ulong boff;
uint32_t ret;
uint8_t *p;
ret = -1;
offset -= pfl->base;
boff = offset & 0xFF; /* why this here ?? */
if (pfl->width == 2)
boff = boff >> 1;
else if (pfl->width == 4)
boff = boff >> 2;
DPRINTF("%s: reading offset " TARGET_FMT_lx " under cmd %02x width %d\n",
__func__, offset, pfl->cmd, width);
switch (pfl->cmd) {
case 0x00:
/* Flash area read */
p = pfl->storage;
switch (width) {
case 1:
ret = p[offset];
DPRINTF("%s: data offset " TARGET_FMT_lx " %02x\n",
__func__, offset, ret);
break;
case 2:
#if defined(TARGET_WORDS_BIGENDIAN)
ret = p[offset] << 8;
ret |= p[offset + 1];
#else
ret = p[offset];
ret |= p[offset + 1] << 8;
#endif
DPRINTF("%s: data offset " TARGET_FMT_lx " %04x\n",
__func__, offset, ret);
break;
case 4:
#if defined(TARGET_WORDS_BIGENDIAN)
ret = p[offset] << 24;
ret |= p[offset + 1] << 16;
ret |= p[offset + 2] << 8;
ret |= p[offset + 3];
#else
ret = p[offset];
ret |= p[offset + 1] << 8;
ret |= p[offset + 1] << 8;
ret |= p[offset + 2] << 16;
ret |= p[offset + 3] << 24;
#endif
DPRINTF("%s: data offset " TARGET_FMT_lx " %08x\n",
__func__, offset, ret);
break;
default:
DPRINTF("BUG in %s\n", __func__);
}
break;
case 0x20: /* Block erase */
case 0x50: /* Clear status register */
case 0x60: /* Block /un)lock */
case 0x70: /* Status Register */
case 0xe8: /* Write block */
/* Status register read */
ret = pfl->status;
DPRINTF("%s: status %x\n", __func__, ret);
break;
case 0x98: /* Query mode */
if (boff > pfl->cfi_len)
ret = 0;
else
ret = pfl->cfi_table[boff];
break;
default:
/* This should never happen : reset state & treat it as a read */
DPRINTF("%s: unknown command state: %x\n", __func__, pfl->cmd);
pfl->wcycle = 0;
pfl->cmd = 0;
}
return ret;
}
/* update flash content on disk */
static void pflash_update(pflash_t *pfl, int offset,
int size)
{
int offset_end;
if (pfl->bs) {
offset_end = offset + size;
/* round to sectors */
offset = offset >> 9;
offset_end = (offset_end + 511) >> 9;
bdrv_write(pfl->bs, offset, pfl->storage + (offset << 9),
offset_end - offset);
}
}
static void pflash_write (pflash_t *pfl, target_ulong offset, uint32_t value,
int width)
{
target_ulong boff;
uint8_t *p;
uint8_t cmd;
cmd = value;
offset -= pfl->base;
DPRINTF("%s: writing offset " TARGET_FMT_lx " value %08x width %d wcycle 0x%x\n",
__func__, offset, value, width, pfl->wcycle);
/* Set the device in I/O access mode */
cpu_register_physical_memory(pfl->base, pfl->total_len, pfl->fl_mem);
boff = offset & (pfl->sector_len - 1);
if (pfl->width == 2)
boff = boff >> 1;
else if (pfl->width == 4)
boff = boff >> 2;
switch (pfl->wcycle) {
case 0:
/* read mode */
switch (cmd) {
case 0x00: /* ??? */
goto reset_flash;
case 0x20: /* Block erase */
p = pfl->storage;
offset &= ~(pfl->sector_len - 1);
DPRINTF("%s: block erase at " TARGET_FMT_lx " bytes "
TARGET_FMT_lx "\n",
__func__, offset, pfl->sector_len);
memset(p + offset, 0xff, pfl->sector_len);
pflash_update(pfl, offset, pfl->sector_len);
pfl->status |= 0x80; /* Ready! */
break;
case 0x50: /* Clear status bits */
DPRINTF("%s: Clear status bits\n", __func__);
pfl->status = 0x0;
goto reset_flash;
case 0x60: /* Block (un)lock */
DPRINTF("%s: Block unlock\n", __func__);
break;
case 0x70: /* Status Register */
DPRINTF("%s: Read status register\n", __func__);
pfl->cmd = cmd;
return;
case 0x98: /* CFI query */
DPRINTF("%s: CFI query\n", __func__);
break;
case 0xe8: /* Write to buffer */
DPRINTF("%s: Write to buffer\n", __func__);
pfl->status |= 0x80; /* Ready! */
break;
case 0xff: /* Read array mode */
DPRINTF("%s: Read array mode\n", __func__);
goto reset_flash;
default:
goto error_flash;
}
pfl->wcycle++;
pfl->cmd = cmd;
return;
case 1:
switch (pfl->cmd) {
case 0x20: /* Block erase */
case 0x28:
if (cmd == 0xd0) { /* confirm */
pfl->wcycle = 0;
pfl->status |= 0x80;
} else if (cmd == 0xff) { /* read array mode */
goto reset_flash;
} else
goto error_flash;
break;
case 0xe8:
DPRINTF("%s: block write of %x bytes\n", __func__, value);
pfl->counter = value;
pfl->wcycle++;
break;
case 0x60:
if (cmd == 0xd0) {
pfl->wcycle = 0;
pfl->status |= 0x80;
} else if (cmd == 0x01) {
pfl->wcycle = 0;
pfl->status |= 0x80;
} else if (cmd == 0xff) {
goto reset_flash;
} else {
DPRINTF("%s: Unknown (un)locking command\n", __func__);
goto reset_flash;
}
break;
case 0x98:
if (cmd == 0xff) {
goto reset_flash;
} else {
DPRINTF("%s: leaving query mode\n", __func__);
}
break;
default:
goto error_flash;
}
return;
case 2:
switch (pfl->cmd) {
case 0xe8: /* Block write */
p = pfl->storage;
DPRINTF("%s: block write offset " TARGET_FMT_lx
" value %x counter " TARGET_FMT_lx "\n",
__func__, offset, value, pfl->counter);
switch (width) {
case 1:
p[offset] = value;
pflash_update(pfl, offset, 1);
break;
case 2:
#if defined(TARGET_WORDS_BIGENDIAN)
p[offset] = value >> 8;
p[offset + 1] = value;
#else
p[offset] = value;
p[offset + 1] = value >> 8;
#endif
pflash_update(pfl, offset, 2);
break;
case 4:
#if defined(TARGET_WORDS_BIGENDIAN)
p[offset] = value >> 24;
p[offset + 1] = value >> 16;
p[offset + 2] = value >> 8;
p[offset + 3] = value;
#else
p[offset] = value;
p[offset + 1] = value >> 8;
p[offset + 2] = value >> 16;
p[offset + 3] = value >> 24;
#endif
pflash_update(pfl, offset, 4);
break;
}
pfl->status |= 0x80;
if (!pfl->counter) {
DPRINTF("%s: block write finished\n", __func__);
pfl->wcycle++;
}
pfl->counter--;
break;
default:
goto error_flash;
}
return;
case 3: /* Confirm mode */
switch (pfl->cmd) {
case 0xe8: /* Block write */
if (cmd == 0xd0) {
pfl->wcycle = 0;
pfl->status |= 0x80;
} else {
DPRINTF("%s: unknown command for \"write block\"\n", __func__);
PFLASH_BUG("Write block confirm");
goto reset_flash;
}
break;
default:
goto error_flash;
}
return;
default:
/* Should never happen */
DPRINTF("%s: invalid write state\n", __func__);
goto reset_flash;
}
return;
error_flash:
printf("%s: Unimplemented flash cmd sequence "
"(offset " TARGET_FMT_lx ", wcycle 0x%x cmd 0x%x value 0x%x)\n",
__func__, offset, pfl->wcycle, pfl->cmd, value);
reset_flash:
cpu_register_physical_memory(pfl->base, pfl->total_len,
pfl->off | IO_MEM_ROMD | pfl->fl_mem);
pfl->bypass = 0;
pfl->wcycle = 0;
pfl->cmd = 0;
return;
}
static uint32_t pflash_readb (void *opaque, target_phys_addr_t addr)
{
return pflash_read(opaque, addr, 1);
}
static uint32_t pflash_readw (void *opaque, target_phys_addr_t addr)
{
pflash_t *pfl = opaque;
return pflash_read(pfl, addr, 2);
}
static uint32_t pflash_readl (void *opaque, target_phys_addr_t addr)
{
pflash_t *pfl = opaque;
return pflash_read(pfl, addr, 4);
}
static void pflash_writeb (void *opaque, target_phys_addr_t addr,
uint32_t value)
{
pflash_write(opaque, addr, value, 1);
}
static void pflash_writew (void *opaque, target_phys_addr_t addr,
uint32_t value)
{
pflash_t *pfl = opaque;
pflash_write(pfl, addr, value, 2);
}
static void pflash_writel (void *opaque, target_phys_addr_t addr,
uint32_t value)
{
pflash_t *pfl = opaque;
pflash_write(pfl, addr, value, 4);
}
static CPUWriteMemoryFunc *pflash_write_ops[] = {
&pflash_writeb,
&pflash_writew,
&pflash_writel,
};
static CPUReadMemoryFunc *pflash_read_ops[] = {
&pflash_readb,
&pflash_readw,
&pflash_readl,
};
/* Count trailing zeroes of a 32 bits quantity */
static int ctz32 (uint32_t n)
{
int ret;
ret = 0;
if (!(n & 0xFFFF)) {
ret += 16;
n = n >> 16;
}
if (!(n & 0xFF)) {
ret += 8;
n = n >> 8;
}
if (!(n & 0xF)) {
ret += 4;
n = n >> 4;
}
if (!(n & 0x3)) {
ret += 2;
n = n >> 2;
}
if (!(n & 0x1)) {
ret++;
n = n >> 1;
}
#if 0 /* This is not necessary as n is never 0 */
if (!n)
ret++;
#endif
return ret;
}
pflash_t *pflash_cfi01_register(target_phys_addr_t base, ram_addr_t off,
BlockDriverState *bs, uint32_t sector_len,
int nb_blocs, int width,
uint16_t id0, uint16_t id1,
uint16_t id2, uint16_t id3)
{
pflash_t *pfl;
target_long total_len;
total_len = sector_len * nb_blocs;
/* XXX: to be fixed */
#if 0
if (total_len != (8 * 1024 * 1024) && total_len != (16 * 1024 * 1024) &&
total_len != (32 * 1024 * 1024) && total_len != (64 * 1024 * 1024))
return NULL;
#endif
pfl = qemu_mallocz(sizeof(pflash_t));
if (pfl == NULL)
return NULL;
pfl->storage = phys_ram_base + off;
pfl->fl_mem = cpu_register_io_memory(0,
pflash_read_ops, pflash_write_ops, pfl);
pfl->off = off;
cpu_register_physical_memory(base, total_len,
off | pfl->fl_mem | IO_MEM_ROMD);
pfl->bs = bs;
if (pfl->bs) {
/* read the initial flash content */
bdrv_read(pfl->bs, 0, pfl->storage, total_len >> 9);
}
#if 0 /* XXX: there should be a bit to set up read-only,
* the same way the hardware does (with WP pin).
*/
pfl->ro = 1;
#else
pfl->ro = 0;
#endif
pfl->timer = qemu_new_timer(vm_clock, pflash_timer, pfl);
pfl->base = base;
pfl->sector_len = sector_len;
pfl->total_len = total_len;
pfl->width = width;
pfl->wcycle = 0;
pfl->cmd = 0;
pfl->status = 0;
pfl->ident[0] = id0;
pfl->ident[1] = id1;
pfl->ident[2] = id2;
pfl->ident[3] = id3;
/* Hardcoded CFI table */
pfl->cfi_len = 0x52;
/* Standard "QRY" string */
pfl->cfi_table[0x10] = 'Q';
pfl->cfi_table[0x11] = 'R';
pfl->cfi_table[0x12] = 'Y';
/* Command set (Intel) */
pfl->cfi_table[0x13] = 0x01;
pfl->cfi_table[0x14] = 0x00;
/* Primary extended table address (none) */
pfl->cfi_table[0x15] = 0x31;
pfl->cfi_table[0x16] = 0x00;
/* Alternate command set (none) */
pfl->cfi_table[0x17] = 0x00;
pfl->cfi_table[0x18] = 0x00;
/* Alternate extended table (none) */
pfl->cfi_table[0x19] = 0x00;
pfl->cfi_table[0x1A] = 0x00;
/* Vcc min */
pfl->cfi_table[0x1B] = 0x45;
/* Vcc max */
pfl->cfi_table[0x1C] = 0x55;
/* Vpp min (no Vpp pin) */
pfl->cfi_table[0x1D] = 0x00;
/* Vpp max (no Vpp pin) */
pfl->cfi_table[0x1E] = 0x00;
/* Reserved */
pfl->cfi_table[0x1F] = 0x07;
/* Timeout for min size buffer write */
pfl->cfi_table[0x20] = 0x07;
/* Typical timeout for block erase */
pfl->cfi_table[0x21] = 0x0a;
/* Typical timeout for full chip erase (4096 ms) */
pfl->cfi_table[0x22] = 0x00;
/* Reserved */
pfl->cfi_table[0x23] = 0x04;
/* Max timeout for buffer write */
pfl->cfi_table[0x24] = 0x04;
/* Max timeout for block erase */
pfl->cfi_table[0x25] = 0x04;
/* Max timeout for chip erase */
pfl->cfi_table[0x26] = 0x00;
/* Device size */
pfl->cfi_table[0x27] = ctz32(total_len); // + 1;
/* Flash device interface (8 & 16 bits) */
pfl->cfi_table[0x28] = 0x02;
pfl->cfi_table[0x29] = 0x00;
/* Max number of bytes in multi-bytes write */
pfl->cfi_table[0x2A] = 0x0B;
pfl->cfi_table[0x2B] = 0x00;
/* Number of erase block regions (uniform) */
pfl->cfi_table[0x2C] = 0x01;
/* Erase block region 1 */
pfl->cfi_table[0x2D] = nb_blocs - 1;
pfl->cfi_table[0x2E] = (nb_blocs - 1) >> 8;
pfl->cfi_table[0x2F] = sector_len >> 8;
pfl->cfi_table[0x30] = sector_len >> 16;
/* Extended */
pfl->cfi_table[0x31] = 'P';
pfl->cfi_table[0x32] = 'R';
pfl->cfi_table[0x33] = 'I';
pfl->cfi_table[0x34] = '1';
pfl->cfi_table[0x35] = '1';
pfl->cfi_table[0x36] = 0x00;
pfl->cfi_table[0x37] = 0x00;
pfl->cfi_table[0x38] = 0x00;
pfl->cfi_table[0x39] = 0x00;
pfl->cfi_table[0x3a] = 0x00;
pfl->cfi_table[0x3b] = 0x00;
pfl->cfi_table[0x3c] = 0x00;
return pfl;
}
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