diff options
| -rw-r--r-- | hw/block/pflash_cfi02.c | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/hw/block/pflash_cfi02.c b/hw/block/pflash_cfi02.c index 303d225f23..e9eea0ec08 100644 --- a/hw/block/pflash_cfi02.c +++ b/hw/block/pflash_cfi02.c @@ -102,6 +102,31 @@ struct PFlashCFI02 { }; /* + * Toggle status bit DQ7. + */ +static inline void toggle_dq7(PFlashCFI02 *pfl) +{ + pfl->status ^= 0x80; +} + +/* + * Set status bit DQ7 to bit 7 of value. + */ +static inline void set_dq7(PFlashCFI02 *pfl, uint8_t value) +{ + pfl->status &= 0x7F; + pfl->status |= value & 0x80; +} + +/* + * Toggle status bit DQ6. + */ +static inline void toggle_dq6(PFlashCFI02 *pfl) +{ + pfl->status ^= 0x40; +} + +/* * Set up replicated mappings of the same region. */ static void pflash_setup_mappings(PFlashCFI02 *pfl) @@ -130,7 +155,7 @@ static void pflash_timer (void *opaque) trace_pflash_timer_expired(pfl->cmd); /* Reset flash */ - pfl->status ^= 0x80; + toggle_dq7(pfl); if (pfl->bypass) { pfl->wcycle = 2; } else { @@ -229,8 +254,7 @@ static uint32_t pflash_read(PFlashCFI02 *pfl, hwaddr offset, /* Status register read */ ret = pfl->status; DPRINTF("%s: status %" PRIx32 "\n", __func__, ret); - /* Toggle bit 6 */ - pfl->status ^= 0x40; + toggle_dq6(pfl); break; case 0x98: /* CFI query mode */ @@ -374,7 +398,11 @@ static void pflash_write(PFlashCFI02 *pfl, hwaddr offset, break; } } - pfl->status = 0x00 | ~(value & 0x80); + /* + * While programming, status bit DQ7 should hold the opposite + * value from how it was programmed. + */ + set_dq7(pfl, ~value); /* Let's pretend write is immediate */ if (pfl->bypass) goto do_bypass; @@ -422,7 +450,7 @@ static void pflash_write(PFlashCFI02 *pfl, hwaddr offset, memset(pfl->storage, 0xFF, pfl->chip_len); pflash_update(pfl, 0, pfl->chip_len); } - pfl->status = 0x00; + set_dq7(pfl, 0x00); /* Let's wait 5 seconds before chip erase is done */ timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (NANOSECONDS_PER_SECOND * 5)); @@ -437,7 +465,7 @@ static void pflash_write(PFlashCFI02 *pfl, hwaddr offset, memset(p + offset, 0xFF, pfl->sector_len); pflash_update(pfl, offset, pfl->sector_len); } - pfl->status = 0x00; + set_dq7(pfl, 0x00); /* Let's wait 1/2 second before sector erase is done */ timer_mod(&pfl->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + (NANOSECONDS_PER_SECOND / 2)); |