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List: qemu-block
Subject: [PATCH 09/22] hw/sd: ssi-sd: Use macros for the dummy value and tokens in the transfer
From: Bin Meng <bmeng.cn () gmail ! com>
Date: 2020-12-31 11:29:57
Message-ID: 20201231113010.27108-10-bmeng.cn () gmail ! com
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From: Bin Meng <bin.meng@windriver.com>
At present the codes use hardcoded numbers (0xff/0xfe) for the dummy
value and block start token. Replace them with macros, and add more
tokens for multiple block write.
Signed-off-by: Bin Meng <bin.meng@windriver.com>
---
hw/sd/ssi-sd.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index 889260bd8f..8eb48550cf 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -78,6 +78,18 @@ OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD)
#define SSI_SDR_ADDRESS_ERROR 0x2000
#define SSI_SDR_PARAMETER_ERROR 0x4000
+/* reading and writing blocks start with these tokens and end with crc16 */
+
+/* multiple block write */
+#define SSI_TOKEN_MULTI_WRITE 0xfc
+/* terminate multiple block write */
+#define SSI_TOKEN_STOP_TRAN 0xfd
+/* single block read/write, multiple block read */
+#define SSI_TOKEN_SINGLE 0xfe
+
+/* dummy value - don't care */
+#define SSI_DUMMY 0xff
+
static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
{
ssi_sd_state *s = SSI_SD(dev);
@@ -91,14 +103,14 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
switch (s->mode) {
case SSI_SD_CMD:
- if (val == 0xff) {
+ if (val == SSI_DUMMY) {
DPRINTF("NULL command\n");
- return 0xff;
+ return SSI_DUMMY;
}
s->cmd = val & 0x3f;
s->mode = SSI_SD_CMDARG;
s->arglen = 0;
- return 0xff;
+ return SSI_DUMMY;
case SSI_SD_CMDARG:
if (s->arglen == 4) {
SDRequest request;
@@ -173,14 +185,14 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
} else {
s->cmdarg[s->arglen++] = val;
}
- return 0xff;
+ return SSI_DUMMY;
case SSI_SD_PREP_RESP:
s->mode = SSI_SD_RESPONSE;
- return 0xff;
+ return SSI_DUMMY;
case SSI_SD_RESPONSE:
if (s->stopping) {
s->stopping = 0;
- return 0xff;
+ return SSI_DUMMY;
}
if (s->response_pos < s->arglen) {
DPRINTF("Response 0x%02x\n", s->response[s->response_pos]);
@@ -193,12 +205,12 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
DPRINTF("End of command\n");
s->mode = SSI_SD_CMD;
}
- return 0xff;
+ return SSI_DUMMY;
case SSI_SD_DATA_START:
DPRINTF("Start read block\n");
s->mode = SSI_SD_DATA_READ;
s->response_pos = 0;
- return 0xfe;
+ return SSI_TOKEN_SINGLE;
case SSI_SD_DATA_READ:
val = sdbus_read_byte(&s->sdbus);
s->read_bytes++;
@@ -225,7 +237,7 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
return val;
}
/* Should never happen. */
- return 0xff;
+ return SSI_DUMMY;
}
static int ssi_sd_post_load(void *opaque, int version_id)
--
2.25.1
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