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-rw-r--r--hw/block/pflash_cfi02.c154
1 files changed, 140 insertions, 14 deletions
diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c
index 5874bd55ad..a3665da3b8 100644
--- a/hw/block/pflash_cfi02.c
+++ b/hw/block/pflash_cfi02.c
@@ -30,7 +30,6 @@
*
* 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
*/
#include "qemu/osdep.h"
@@ -38,6 +37,7 @@
#include "hw/block/block.h"
#include "hw/block/flash.h"
#include "qapi/error.h"
+#include "qemu/bitmap.h"
#include "qemu/timer.h"
#include "sysemu/block-backend.h"
#include "qemu/host-utils.h"
@@ -76,6 +76,7 @@ struct PFlashCFI02 {
BlockBackend *blk;
uint32_t uniform_nb_blocs;
uint32_t uniform_sector_len;
+ uint32_t total_sectors;
uint32_t nb_blocs[PFLASH_MAX_ERASE_REGIONS];
uint32_t sector_len[PFLASH_MAX_ERASE_REGIONS];
uint32_t chip_len;
@@ -106,6 +107,8 @@ struct PFlashCFI02 {
int rom_mode;
int read_counter; /* used for lazy switch-back to rom mode */
int sectors_to_erase;
+ uint64_t erase_time_remaining;
+ unsigned long *sector_erase_map;
char *name;
void *storage;
};
@@ -152,6 +155,14 @@ static inline void reset_dq3(PFlashCFI02 *pfl)
}
/*
+ * Toggle status bit DQ2.
+ */
+static inline void toggle_dq2(PFlashCFI02 *pfl)
+{
+ pfl->status ^= 0x04;
+}
+
+/*
* Set up replicated mappings of the same region.
*/
static void pflash_setup_mappings(PFlashCFI02 *pfl)
@@ -179,6 +190,29 @@ static size_t pflash_regions_count(PFlashCFI02 *pfl)
return pfl->cfi_table[0x2c];
}
+/*
+ * Returns the time it takes to erase the number of sectors scheduled for
+ * erasure based on CFI address 0x21 which is "Typical timeout per individual
+ * block erase 2^N ms."
+ */
+static uint64_t pflash_erase_time(PFlashCFI02 *pfl)
+{
+ /*
+ * If there are no sectors to erase (which can happen if all of the sectors
+ * to be erased are protected), then erase takes 100 us. Protected sectors
+ * aren't supported so this should never happen.
+ */
+ return ((1ULL << pfl->cfi_table[0x21]) * pfl->sectors_to_erase) * SCALE_US;
+}
+
+/*
+ * Returns true if the device is currently in erase suspend mode.
+ */
+static inline bool pflash_erase_suspend_mode(PFlashCFI02 *pfl)
+{
+ return pfl->erase_time_remaining > 0;
+}
+
static void pflash_timer(void *opaque)
{
PFlashCFI02 *pfl = opaque;
@@ -193,12 +227,7 @@ static void pflash_timer(void *opaque)
*/
if ((pfl->status & 0x08) == 0) {
assert_dq3(pfl);
- /*
- * CFI address 0x21 is "Typical timeout per individual block erase
- * 2^N ms"
- */
- uint64_t timeout = ((1ULL << pfl->cfi_table[0x21]) *
- pfl->sectors_to_erase) * 1000000;
+ uint64_t timeout = pflash_erase_time(pfl);
timer_mod(&pfl->timer,
qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
DPRINTF("%s: erase timeout fired; erasing %d sectors\n",
@@ -206,6 +235,7 @@ static void pflash_timer(void *opaque)
return;
}
DPRINTF("%s: sector erase complete\n", __func__);
+ bitmap_zero(pfl->sector_erase_map, pfl->total_sectors);
pfl->sectors_to_erase = 0;
reset_dq3(pfl);
}
@@ -233,24 +263,44 @@ static uint64_t pflash_data_read(PFlashCFI02 *pfl, hwaddr offset,
return ret;
}
+typedef struct {
+ uint32_t len;
+ uint32_t num;
+} SectorInfo;
+
/*
* offset should be a byte offset of the QEMU device and _not_ a device
* offset.
*/
-static uint32_t pflash_sector_len(PFlashCFI02 *pfl, hwaddr offset)
+static SectorInfo pflash_sector_info(PFlashCFI02 *pfl, hwaddr offset)
{
assert(offset < pfl->chip_len);
hwaddr addr = 0;
+ uint32_t sector_num = 0;
for (int i = 0; i < pflash_regions_count(pfl); ++i) {
uint64_t region_size = (uint64_t)pfl->nb_blocs[i] * pfl->sector_len[i];
if (addr <= offset && offset < addr + region_size) {
- return pfl->sector_len[i];
+ return (SectorInfo) {
+ .len = pfl->sector_len[i],
+ .num = sector_num + (offset - addr) / pfl->sector_len[i],
+ };
}
+ sector_num += pfl->nb_blocs[i];
addr += region_size;
}
abort();
}
+/*
+ * Returns true if the offset refers to a flash sector that is currently being
+ * erased.
+ */
+static bool pflash_sector_is_erasing(PFlashCFI02 *pfl, hwaddr offset)
+{
+ long sector_num = pflash_sector_info(pfl, offset).num;
+ return test_bit(sector_num, pfl->sector_erase_map);
+}
+
static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
{
PFlashCFI02 *pfl = opaque;
@@ -280,6 +330,15 @@ static uint64_t pflash_read(void *opaque, hwaddr offset, unsigned int width)
case 0x80:
/* We accept reads during second unlock sequence... */
case 0x00:
+ if (pflash_erase_suspend_mode(pfl) &&
+ pflash_sector_is_erasing(pfl, offset)) {
+ /* Toggle bit 2, but not 6. */
+ toggle_dq2(pfl);
+ /* Status register read */
+ ret = pfl->status;
+ DPRINTF("%s: status %" PRIx64 "\n", __func__, ret);
+ break;
+ }
/* Flash area read */
ret = pflash_data_read(pfl, offset, width);
break;
@@ -305,13 +364,16 @@ 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 0xA0:
case 0x10:
case 0x30:
+ /* Toggle bit 2 during erase, but not program. */
+ toggle_dq2(pfl);
+ case 0xA0:
+ /* Toggle bit 6 */
+ toggle_dq6(pfl);
/* Status register read */
ret = pfl->status;
DPRINTF("%s: status %" PRIx64 "\n", __func__, ret);
- toggle_dq6(pfl);
break;
case 0x98:
/* CFI query mode */
@@ -343,7 +405,8 @@ static void pflash_update(PFlashCFI02 *pfl, int offset, int size)
static void pflash_sector_erase(PFlashCFI02 *pfl, hwaddr offset)
{
- uint64_t sector_len = pflash_sector_len(pfl, offset);
+ SectorInfo sector_info = pflash_sector_info(pfl, offset);
+ uint64_t sector_len = sector_info.len;
offset &= ~(sector_len - 1);
DPRINTF("%s: start sector erase at %0*" PRIx64 "-%0*" PRIx64 "\n",
__func__, pfl->width * 2, offset,
@@ -355,6 +418,7 @@ static void pflash_sector_erase(PFlashCFI02 *pfl, hwaddr offset)
}
set_dq7(pfl, 0x00);
++pfl->sectors_to_erase;
+ set_bit(sector_info.num, pfl->sector_erase_map);
/* Set (or reset) the 50 us timer for additional erase commands. */
timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 50000);
}
@@ -405,6 +469,25 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
pfl->cmd = 0x98;
return;
}
+ /* Handle erase resume in erase suspend mode, otherwise reset. */
+ if (cmd == 0x30) {
+ if (pflash_erase_suspend_mode(pfl)) {
+ /* Resume the erase. */
+ timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
+ pfl->erase_time_remaining);
+ pfl->erase_time_remaining = 0;
+ pfl->wcycle = 6;
+ pfl->cmd = 0x30;
+ set_dq7(pfl, 0x00);
+ assert_dq3(pfl);
+ return;
+ }
+ goto reset_flash;
+ }
+ /* Ignore erase suspend. */
+ if (cmd == 0xB0) {
+ return;
+ }
if (boff != pfl->unlock_addr0 || cmd != 0xAA) {
DPRINTF("%s: unlock0 failed " TARGET_FMT_plx " %02x %04x\n",
__func__, boff, cmd, pfl->unlock_addr0);
@@ -450,6 +533,14 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
/* We need another unlock sequence */
goto check_unlock0;
case 0xA0:
+ if (pflash_erase_suspend_mode(pfl) &&
+ pflash_sector_is_erasing(pfl, offset)) {
+ /* Ignore writes to erasing sectors. */
+ if (pfl->bypass) {
+ goto do_bypass;
+ }
+ goto reset_flash;
+ }
trace_pflash_data_write(offset, width << 1, value, 0);
if (!pfl->ro) {
p = (uint8_t *)pfl->storage + offset;
@@ -508,6 +599,10 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
}
break;
case 5:
+ if (pflash_erase_suspend_mode(pfl)) {
+ /* Erasing is not supported in erase suspend mode. */
+ goto reset_flash;
+ }
switch (cmd) {
case 0x10:
if (boff != pfl->unlock_addr0) {
@@ -542,6 +637,30 @@ static void pflash_write(void *opaque, hwaddr offset, uint64_t value,
/* Ignore writes during chip erase */
return;
case 0x30:
+ if (cmd == 0xB0) {
+ /*
+ * If erase suspend happens during the erase timeout (so DQ3 is
+ * 0), then the device suspends erasing immediately. Set the
+ * remaining time to be the total time to erase. Otherwise,
+ * there is a maximum amount of time it can take to enter
+ * suspend mode. Let's ignore that and suspend immediately and
+ * set the remaining time to the actual time remaining on the
+ * timer.
+ */
+ if ((pfl->status & 0x08) == 0) {
+ pfl->erase_time_remaining = pflash_erase_time(pfl);
+ } else {
+ int64_t delta = timer_expire_time_ns(&pfl->timer) -
+ qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+ /* Make sure we have a positive time remaining. */
+ pfl->erase_time_remaining = delta <= 0 ? 1 : delta;
+ }
+ reset_dq3(pfl);
+ timer_del(&pfl->timer);
+ pfl->wcycle = 0;
+ pfl->cmd = 0;
+ return;
+ }
/*
* If DQ3 is 0, additional sector erase commands can be
* written and anything else (other than an erase suspend) resets
@@ -619,10 +738,12 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
int nb_regions;
pfl->chip_len = 0;
+ pfl->total_sectors = 0;
for (nb_regions = 0; nb_regions < PFLASH_MAX_ERASE_REGIONS; ++nb_regions) {
if (pfl->nb_blocs[nb_regions] == 0) {
break;
}
+ pfl->total_sectors += pfl->nb_blocs[nb_regions];
uint64_t sector_len_per_device = pfl->sector_len[nb_regions];
/*
@@ -656,6 +777,7 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
pfl->nb_blocs[0] = pfl->uniform_nb_blocs;
pfl->sector_len[0] = pfl->uniform_sector_len;
pfl->chip_len = uniform_len;
+ pfl->total_sectors = pfl->uniform_nb_blocs;
} else if (uniform_len != 0 && uniform_len != pfl->chip_len) {
error_setg(errp, "\"num-blocks\"*\"sector-length\" "
"different from \"num-blocks0\"*\'sector-length0\" + ... + "
@@ -697,6 +819,9 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
pfl->unlock_addr0 &= 0x7FF;
pfl->unlock_addr1 &= 0x7FF;
+ /* Allocate memory for a bitmap for sectors being erased. */
+ pfl->sector_erase_map = bitmap_new(pfl->total_sectors);
+
pflash_setup_mappings(pfl);
pfl->rom_mode = 1;
sysbus_init_mmio(SYS_BUS_DEVICE(dev), &pfl->mem);
@@ -781,8 +906,8 @@ static void pflash_cfi02_realize(DeviceState *dev, Error **errp)
/* Address sensitive unlock required. */
pfl->cfi_table[0x05 + pri_ofs] = 0x00;
- /* Erase suspend not supported. */
- pfl->cfi_table[0x06 + pri_ofs] = 0x00;
+ /* Erase suspend to read/write. */
+ pfl->cfi_table[0x06 + pri_ofs] = 0x02;
/* Sector protect not supported. */
pfl->cfi_table[0x07 + pri_ofs] = 0x00;
/* Temporary sector unprotect not supported. */
@@ -829,6 +954,7 @@ static void pflash_cfi02_unrealize(DeviceState *dev, Error **errp)
{
PFlashCFI02 *pfl = PFLASH_CFI02(dev);
timer_del(&pfl->timer);
+ g_free(pfl->sector_erase_map);
}
static void pflash_cfi02_class_init(ObjectClass *klass, void *data)
generated by cgit v1.2.3 (git 2.26.2) at 2025-01-12 03:12:39 +0000