From: Bin Meng <bin.m...@windriver.com>
Add 2 more states for the block write operation. The SPI host needs
to send a data start tocken to start the transfer, and the data block
written to the card will be acknowledged by a data response tocken.
Signed-off-by: Bin Meng <bin.m...@windriver.com>
---
hw/sd/ssi-sd.c | 37 ++++++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 8eb48550cf..21a96e91f0 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -42,6 +42,8 @@ typedef enum {
SSI_SD_DATA_START,
SSI_SD_DATA_READ,
SSI_SD_DATA_CRC16,
+ SSI_SD_DATA_WRITE,
+ SSI_SD_SKIP_CRC16,
} ssi_sd_mode;
struct ssi_sd_state {
@@ -52,6 +54,7 @@ struct ssi_sd_state {
uint8_t response[5];
uint16_t crc16;
int32_t read_bytes;
+ int32_t write_bytes;
int32_t arglen;
int32_t response_pos;
int32_t stopping;
@@ -90,6 +93,9 @@ OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD)
/* dummy value - don't care */
#define SSI_DUMMY 0xff
+/* data accepted */
+#define DATA_RESPONSE_ACCEPTED 0x05
+
static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
{
ssi_sd_state *s = SSI_SD(dev);
@@ -103,10 +109,17 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev,
uint32_t val)
switch (s->mode) {
case SSI_SD_CMD:
- if (val == SSI_DUMMY) {
+ switch (val) {
+ case SSI_DUMMY:
DPRINTF("NULL command\n");
return SSI_DUMMY;
+ break;
+ case SSI_TOKEN_SINGLE:
+ DPRINTF("Start write block\n");
+ s->mode = SSI_SD_DATA_WRITE;
+ return SSI_DUMMY;
}
+
s->cmd = val & 0x3f;
s->mode = SSI_SD_CMDARG;
s->arglen = 0;
@@ -235,6 +248,27 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev,
uint32_t val)
s->response_pos = 0;
}
return val;
+ case SSI_SD_DATA_WRITE:
+ sdbus_write_byte(&s->sdbus, val);
+ s->write_bytes++;
+ if (!sdbus_receive_ready(&s->sdbus) || s->write_bytes == 512) {
+ DPRINTF("Data write end\n");
+ s->mode = SSI_SD_SKIP_CRC16;
+ s->response_pos = 0;
+ }
+ return val;
+ case SSI_SD_SKIP_CRC16:
+ /* we don't verify the crc16 */
+ s->response_pos++;
+ if (s->response_pos == 2) {
+ DPRINTF("CRC16 receive end\n");
+ s->mode = SSI_SD_RESPONSE;
+ s->write_bytes = 0;
+ s->arglen = 1;
+ s->response[0] = DATA_RESPONSE_ACCEPTED;
+ s->response_pos = 0;
+ }
+ return SSI_DUMMY;
}
/* Should never happen. */
return SSI_DUMMY;
@@ -325,6 +359,7 @@ static void ssi_sd_reset(DeviceState *dev)
memset(s->response, 0, sizeof(s->response));
s->crc16 = 0;
s->read_bytes = 0;
+ s->write_bytes = 0;
s->arglen = 0;
s->response_pos = 0;
s->stopping = 0;
--
2.25.1
