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[PATCH v4 4/4] hw/block/m25p80: Fix Numonyx fast read dummy cycle count
From: |
Joe Komlodi |
Subject: |
[PATCH v4 4/4] hw/block/m25p80: Fix Numonyx fast read dummy cycle count |
Date: |
Thu, 12 Nov 2020 19:10:55 -0800 |
Numonyx chips determine the number of cycles to wait based on bits 7:4
in the volatile configuration register.
However, if these bits are 0x0 or 0xF, the number of dummy cycles to
wait is
10 on a QIOR or QIOR4 command, or 8 on any other currently supported
fast read command. [1]
[1]
https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_u_02g_cbb_0.pdf?rev=9b167fbf2b3645efba6385949a72e453
Signed-off-by: Joe Komlodi <komlodi@xilinx.com>
---
hw/block/m25p80.c | 30 +++++++++++++++++++++++++++---
1 file changed, 27 insertions(+), 3 deletions(-)
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index 2552f2c..0c78015 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -837,6 +837,30 @@ static uint8_t numonyx_get_mode(Flash *s)
}
}
+static uint8_t numonyx_extract_cfg_num_dummies(Flash *s)
+{
+ uint8_t num_dummies;
+ uint8_t mode;
+ assert(get_man(s) == MAN_NUMONYX);
+
+ mode = numonyx_get_mode(s);
+ num_dummies = extract32(s->volatile_cfg, 4, 4);
+
+ if (num_dummies == 0x0 || num_dummies == 0xf) {
+ switch (s->cmd_in_progress) {
+ case QIOR:
+ case QIOR4:
+ num_dummies = 10;
+ break;
+ default:
+ num_dummies = (mode == MODE_QIO) ? 10 : 8;
+ break;
+ }
+ }
+
+ return num_dummies;
+}
+
static void decode_fast_read_cmd(Flash *s)
{
s->needed_bytes = get_addr_length(s);
@@ -847,7 +871,7 @@ static void decode_fast_read_cmd(Flash *s)
s->state = STATE_COLLECTING_DATA;
break;
case MAN_NUMONYX:
- s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
+ s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
s->state = STATE_COLLECTING_DATA;
break;
case MAN_MACRONIX:
@@ -891,7 +915,7 @@ static void decode_dio_read_cmd(Flash *s)
s->state = STATE_COLLECTING_DATA;
break;
case MAN_NUMONYX:
- s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
+ s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
s->state = STATE_COLLECTING_DATA;
break;
case MAN_MACRONIX:
@@ -935,7 +959,7 @@ static void decode_qio_read_cmd(Flash *s)
s->state = STATE_COLLECTING_DATA;
break;
case MAN_NUMONYX:
- s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
+ s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
s->state = STATE_COLLECTING_DATA;
break;
case MAN_MACRONIX:
--
2.7.4