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hw/block/m25p80: Fix Numonyx fast read dummy cycle count 

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 for QIOR and QIOR4 commands or when in QIO mode, and otherwise 8 for
the currently supported fast read commands. [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>
Reviewed-by: Francisco Iglesias <francisco.iglesias@xilinx.com>
Message-id: 1605568264-26376-5-git-send-email-komlodi@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Joe Komlodi 2020-11-16 15:11:04 -08:00 committed by Peter Maydell
parent 2348623117
commit 23af268566
1 changed files with 27 additions and 3 deletions
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30
hw/block/m25p80.c
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@ -837,6 +837,30 @@ static uint8_t numonyx_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_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);
@ -846,7 +870,7 @@ static void decode_fast_read_cmd(Flash *s)
s->needed_bytes += 8;
break;
case MAN_NUMONYX:
s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
break;
case MAN_MACRONIX:
if (extract32(s->volatile_cfg, 6, 2) == 1) {
@ -885,7 +909,7 @@ static void decode_dio_read_cmd(Flash *s)
);
break;
case MAN_NUMONYX:
s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
break;
case MAN_MACRONIX:
switch (extract32(s->volatile_cfg, 6, 2)) {
@ -925,7 +949,7 @@ static void decode_qio_read_cmd(Flash *s)
);
break;
case MAN_NUMONYX:
s->needed_bytes += extract32(s->volatile_cfg, 4, 4);
s->needed_bytes += numonyx_extract_cfg_num_dummies(s);
break;
case MAN_MACRONIX:
switch (extract32(s->volatile_cfg, 6, 2)) {