From: Bin Meng <bmeng.cn@gmail.com>
To: Alistair Francis <alistair@alistair23.me>,
Kevin Wolf <kwolf@redhat.com>, Max Reitz <mreitz@redhat.com>,
qemu-block@nongnu.org, qemu-devel@nongnu.org
Cc: Xuzhou Cheng <xuzhou.cheng@windriver.com>,
Bin Meng <bin.meng@windriver.com>
Subject: [PATCH] hw/block: m25p80: Implement AAI-WP command support for SST flashes
Date: Wed, 2 Dec 2020 22:30:37 +0800 [thread overview]
Message-ID: <20201202143037.24110-1-bmeng.cn@gmail.com> (raw)
From: Xuzhou Cheng <xuzhou.cheng@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.cheng@windriver.com>
Signed-off-by: Bin Meng <bin.meng@windriver.com>
---
hw/block/m25p80.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index 9b36762df9..f225d9c96d 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,
@@ -449,6 +450,7 @@ struct Flash {
bool four_bytes_address_mode;
bool reset_enable;
bool quad_enable;
+ bool aai_enable;
uint8_t ear;
int64_t dirty_page;
@@ -661,6 +663,7 @@ static void complete_collecting_data(Flash *s)
case PP:
case PP4:
case PP4_4:
+ case AAI_WP:
s->state = STATE_PAGE_PROGRAM;
break;
case READ:
@@ -1010,6 +1013,9 @@ 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;
@@ -1162,6 +1168,17 @@ 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 && 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;
+ }
+ }
+ break;
default:
s->pos = 0;
s->len = 1;
--
2.25.1
next reply other threads:[~2020-12-02 14:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-02 14:30 Bin Meng [this message]
2020-12-03 12:54 ` [PATCH] hw/block: m25p80: Implement AAI-WP command support for SST flashes Francisco Iglesias
2020-12-11 6:13 ` Bin Meng
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