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hw/block/pflash_cfi02: Document commands

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Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20190627202719.17739-28-philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Philippe Mathieu-Daudé 2019-05-18 21:22:03 +02:00
parent 80f2c625cb
commit b034993717
1 changed files with 19 additions and 21 deletions
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40
hw/block/pflash_cfi02.c
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@ -327,7 +327,7 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
pfl->wcycle = 0;
pfl->cmd = 0;
/* fall through to the read code */
case 0x80:
case 0x80: /* Erase (unlock) */
/* We accept reads during second unlock sequence... */
case 0x00:
if (pflash_erase_suspend_mode(pfl) &&
@ -342,8 +342,7 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
/* Flash area read */
ret = pflash_data_read(pfl, offset, width);
break;
case 0x90:
/* flash ID read */
case 0x90: /* flash ID read */
switch (boff) {
case 0x00:
case 0x01:
@ -364,11 +363,11 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
}
DPRINTF("%s: ID " TARGET_FMT_plx " %" PRIx64 "\n", __func__, boff, ret);
break;
case 0x10:
case 0x30:
case 0x10: /* Chip Erase */
case 0x30: /* Sector Erase */
/* Toggle bit 2 during erase, but not program. */
toggle_dq2(pfl);
case 0xA0:
case 0xA0: /* Program */
/* Toggle bit 6 */
toggle_dq6(pfl);
/* Status register read */
@ -470,7 +469,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
return;
}
/* Handle erase resume in erase suspend mode, otherwise reset. */
if (cmd == 0x30) {
if (cmd == 0x30) { /* Erase Resume */
if (pflash_erase_suspend_mode(pfl)) {
/* Resume the erase. */
timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
@ -485,7 +484,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
goto reset_flash;
}
/* Ignore erase suspend. */
if (cmd == 0xB0) {
if (cmd == 0xB0) { /* Erase Suspend */
return;
}
if (boff != pfl->unlock_addr0 || cmd != 0xAA) {
@ -516,9 +515,9 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
case 0x20:
pfl->bypass = 1;
goto do_bypass;
case 0x80:
case 0x90:
case 0xA0:
case 0x80: /* Erase */
case 0x90: /* Autoselect */
case 0xA0: /* Program */
pfl->cmd = cmd;
DPRINTF("%s: starting command %02x\n", __func__, cmd);
break;
@ -529,10 +528,10 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
break;
case 3:
switch (pfl->cmd) {
case 0x80:
case 0x80: /* Erase */
/* We need another unlock sequence */
goto check_unlock0;
case 0xA0:
case 0xA0: /* Program */
if (pflash_erase_suspend_mode(pfl) &&
pflash_sector_is_erasing(pfl, offset)) {
/* Ignore writes to erasing sectors. */
@ -562,7 +561,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
if (pfl->bypass)
goto do_bypass;
goto reset_flash;
case 0x90:
case 0x90: /* Autoselect */
if (pfl->bypass && cmd == 0x00) {
/* Unlock bypass reset */
goto reset_flash;
@ -585,11 +584,11 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
}
case 4:
switch (pfl->cmd) {
case 0xA0:
case 0xA0: /* Program */
/* Ignore writes while flash data write is occurring */
/* As we suppose write is immediate, this should never happen */
return;
case 0x80:
case 0x80: /* Erase */
goto check_unlock1;
default:
/* Should never happen */
@ -604,7 +603,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
goto reset_flash;
}
switch (cmd) {
case 0x10:
case 0x10: /* Chip Erase */
if (boff != pfl->unlock_addr0) {
DPRINTF("%s: chip erase: invalid address " TARGET_FMT_plx "\n",
__func__, offset);
@ -621,8 +620,7 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
(1ULL << pfl->cfi_table[0x22]) * SCALE_MS);
break;
case 0x30:
/* Sector erase */
case 0x30: /* Sector erase */
pflash_sector_erase(pfl, offset);
break;
default:
@ -633,10 +631,10 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
break;
case 6:
switch (pfl->cmd) {
case 0x10:
case 0x10: /* Chip Erase */
/* Ignore writes during chip erase */
return;
case 0x30:
case 0x30: /* Sector erase */
if (cmd == 0xB0) {
/*
* If erase suspend happens during the erase timeout (so DQ3 is