aboutsummaryrefslogtreecommitdiff
path: root/hw/block
diff options
context:
space:
mode:
authorFrancisco Iglesias <frasse.iglesias@gmail.com>2017-12-13 17:59:20 +0000
committerPeter Maydell <peter.maydell@linaro.org>2017-12-13 17:59:20 +0000
commit0add925f7c3188a5e020e223dbb45fb24e093a24 (patch)
tree00141270493edf07d38b4a9683afab3ee9d8ef74 /hw/block
parent0a0dc59d27527b78a195c2d838d28b7b49e5a639 (diff)
m25p80: Add support for continuous read out of RDSR and READ_FSR
Add support for continuous read out of the RDSR and READ_FSR status registers until the chip select is deasserted. This feature is supported by amongst others 1 or more flashtypes manufactured by Numonyx (Micron), Windbond, SST, Gigadevice, Eon and Macronix. Signed-off-by: Francisco Iglesias <frasse.iglesias@gmail.com> Acked-by: Marcin KrzemiƄski<mar.krzeminski@gmail.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Message-id: 20171126231634.9531-2-frasse.iglesias@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/block')
-rw-r--r--hw/block/m25p80.c39
1 files changed, 38 insertions, 1 deletions
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index a2438b9ed2..d50acc1d3a 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -423,6 +423,7 @@ typedef struct Flash {
uint8_t data[M25P80_INTERNAL_DATA_BUFFER_SZ];
uint32_t len;
uint32_t pos;
+ bool data_read_loop;
uint8_t needed_bytes;
uint8_t cmd_in_progress;
uint32_t cur_addr;
@@ -983,6 +984,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
}
s->pos = 0;
s->len = 1;
+ s->data_read_loop = true;
s->state = STATE_READING_DATA;
break;
@@ -993,6 +995,7 @@ static void decode_new_cmd(Flash *s, uint32_t value)
}
s->pos = 0;
s->len = 1;
+ s->data_read_loop = true;
s->state = STATE_READING_DATA;
break;
@@ -1133,6 +1136,7 @@ static int m25p80_cs(SSISlave *ss, bool select)
s->pos = 0;
s->state = STATE_IDLE;
flash_sync_dirty(s, -1);
+ s->data_read_loop = false;
}
DB_PRINT_L(0, "%sselect\n", select ? "de" : "");
@@ -1198,7 +1202,9 @@ static uint32_t m25p80_transfer8(SSISlave *ss, uint32_t tx)
s->pos++;
if (s->pos == s->len) {
s->pos = 0;
- s->state = STATE_IDLE;
+ if (!s->data_read_loop) {
+ s->state = STATE_IDLE;
+ }
}
break;
@@ -1269,11 +1275,38 @@ static Property m25p80_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
+static int m25p80_pre_load(void *opaque)
+{
+ Flash *s = (Flash *)opaque;
+
+ s->data_read_loop = false;
+ return 0;
+}
+
+static bool m25p80_data_read_loop_needed(void *opaque)
+{
+ Flash *s = (Flash *)opaque;
+
+ return s->data_read_loop;
+}
+
+static const VMStateDescription vmstate_m25p80_data_read_loop = {
+ .name = "m25p80/data_read_loop",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = m25p80_data_read_loop_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_BOOL(data_read_loop, Flash),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static const VMStateDescription vmstate_m25p80 = {
.name = "m25p80",
.version_id = 0,
.minimum_version_id = 0,
.pre_save = m25p80_pre_save,
+ .pre_load = m25p80_pre_load,
.fields = (VMStateField[]) {
VMSTATE_UINT8(state, Flash),
VMSTATE_UINT8_ARRAY(data, Flash, M25P80_INTERNAL_DATA_BUFFER_SZ),
@@ -1295,6 +1328,10 @@ static const VMStateDescription vmstate_m25p80 = {
VMSTATE_UINT8(spansion_cr3nv, Flash),
VMSTATE_UINT8(spansion_cr4nv, Flash),
VMSTATE_END_OF_LIST()
+ },
+ .subsections = (const VMStateDescription * []) {
+ &vmstate_m25p80_data_read_loop,
+ NULL
}
};