From: Xuzhou Cheng <xuzhou.ch...@windriver.com> Auto Address Increment (AAI) Word-Program is a special command of SST flashes. AAI-WP allows multiple bytes of data to be programmed without re-issuing the next sequential address location.
Signed-off-by: Xuzhou Cheng <xuzhou.ch...@windriver.com> Signed-off-by: Bin Meng <bin.m...@windriver.com> --- Changes in v5: - remove the guest error logging when address wrap is detected in AAI - change to return s->aai_enable in m25p80_aai_enable_needed() Changes in v4: - simplify is_valid_aai_cmd() - use a subsection for s->aai_enable vm state Changes in v3: - initialize aai_enable to false in reset_memory() Changes in v2: - add aai_enable into the vmstate - validate AAI command before decoding a new command - log guest errors during AAI_WP command handling - report AAI status in the status register - abort AAI programming when address is wrapped - make sure AAI programming starts from the even address hw/block/m25p80.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c index 29598b4..c64852f 100644 --- a/hw/block/m25p80.c +++ b/hw/block/m25p80.c @@ -359,6 +359,7 @@ typedef enum { QPP_4 = 0x34, RDID_90 = 0x90, RDID_AB = 0xab, + AAI_WP = 0xad, ERASE_4K = 0x20, ERASE4_4K = 0x21, @@ -455,6 +456,7 @@ struct Flash { bool four_bytes_address_mode; bool reset_enable; bool quad_enable; + bool aai_enable; uint8_t ear; int64_t dirty_page; @@ -670,6 +672,11 @@ static void complete_collecting_data(Flash *s) case PP4_4: s->state = STATE_PAGE_PROGRAM; break; + case AAI_WP: + /* AAI programming starts from the even address */ + s->cur_addr &= ~BIT(0); + s->state = STATE_PAGE_PROGRAM; + break; case READ: case READ4: case FAST_READ: @@ -768,6 +775,7 @@ static void reset_memory(Flash *s) s->write_enable = false; s->reset_enable = false; s->quad_enable = false; + s->aai_enable = false; switch (get_man(s)) { case MAN_NUMONYX: @@ -973,6 +981,11 @@ static void decode_qio_read_cmd(Flash *s) s->state = STATE_COLLECTING_DATA; } +static bool is_valid_aai_cmd(uint32_t cmd) +{ + return cmd == AAI_WP || cmd == WRDI || cmd == RDSR; +} + static void decode_new_cmd(Flash *s, uint32_t value) { int i; @@ -984,6 +997,11 @@ static void decode_new_cmd(Flash *s, uint32_t value) s->reset_enable = false; } + if (get_man(s) == MAN_SST && s->aai_enable && !is_valid_aai_cmd(value)) { + qemu_log_mask(LOG_GUEST_ERROR, + "M25P80: Invalid cmd within AAI programming sequence"); + } + switch (value) { case ERASE_4K: @@ -1103,6 +1121,9 @@ static void decode_new_cmd(Flash *s, uint32_t value) case WRDI: s->write_enable = false; + if (get_man(s) == MAN_SST) { + s->aai_enable = false; + } break; case WREN: s->write_enable = true; @@ -1113,6 +1134,10 @@ static void decode_new_cmd(Flash *s, uint32_t value) if (get_man(s) == MAN_MACRONIX) { s->data[0] |= (!!s->quad_enable) << 6; } + if (get_man(s) == MAN_SST) { + s->data[0] |= (!!s->aai_enable) << 6; + } + s->pos = 0; s->len = 1; s->data_read_loop = true; @@ -1260,6 +1285,24 @@ static void decode_new_cmd(Flash *s, uint32_t value) case RSTQIO: s->quad_enable = false; break; + case AAI_WP: + if (get_man(s) == MAN_SST) { + if (s->write_enable) { + if (s->aai_enable) { + s->state = STATE_PAGE_PROGRAM; + } else { + s->aai_enable = true; + s->needed_bytes = get_addr_length(s); + s->state = STATE_COLLECTING_DATA; + } + } else { + qemu_log_mask(LOG_GUEST_ERROR, + "M25P80: AAI_WP with write protect\n"); + } + } else { + qemu_log_mask(LOG_GUEST_ERROR, "M25P80: Unknown cmd %x\n", value); + } + break; default: s->pos = 0; s->len = 1; @@ -1305,6 +1348,17 @@ static uint32_t m25p80_transfer8(SSIPeripheral *ss, uint32_t tx) trace_m25p80_page_program(s, s->cur_addr, (uint8_t)tx); flash_write8(s, s->cur_addr, (uint8_t)tx); s->cur_addr = (s->cur_addr + 1) & (s->size - 1); + + if (get_man(s) == MAN_SST && s->aai_enable && s->cur_addr == 0) { + /* + * There is no wrap mode during AAI programming once the highest + * unprotected memory address is reached. The Write-Enable-Latch + * bit is automatically reset, and AAI programming mode aborts. + */ + s->write_enable = false; + s->aai_enable = false; + } + break; case STATE_READ: @@ -1450,6 +1504,24 @@ static const VMStateDescription vmstate_m25p80_data_read_loop = { } }; +static bool m25p80_aai_enable_needed(void *opaque) +{ + Flash *s = (Flash *)opaque; + + return s->aai_enable; +} + +static const VMStateDescription vmstate_m25p80_aai_enable = { + .name = "m25p80/aai_enable", + .version_id = 1, + .minimum_version_id = 1, + .needed = m25p80_aai_enable_needed, + .fields = (VMStateField[]) { + VMSTATE_BOOL(aai_enable, Flash), + VMSTATE_END_OF_LIST() + } +}; + static const VMStateDescription vmstate_m25p80 = { .name = "m25p80", .version_id = 0, @@ -1480,6 +1552,7 @@ static const VMStateDescription vmstate_m25p80 = { }, .subsections = (const VMStateDescription * []) { &vmstate_m25p80_data_read_loop, + &vmstate_m25p80_aai_enable, NULL } }; -- 2.7.4