On Thu, Dec 31, 2020 at 3:47 AM Bin Meng <bmeng...@gmail.com> wrote:
>
> From: Bin Meng <bin.m...@windriver.com>
>
> For a multiple block write operation, each block begins with a multi
> write start token. Unlike the SD mode that the multiple block write
> ends when receiving a STOP_TRAN command (CMD12), a special stop tran
> tocken is used to signal the card.
>
> Emulating this by manually sending a CMD12 to the SD card core, to
> bring it out of the receiving data state.
>
> Signed-off-by: Bin Meng <bin.m...@windriver.com>
Acked-by: Alistair Francis <alistair.fran...@wdc.com>
Alistair
> ---
>
> hw/sd/ssi-sd.c | 26 ++++++++++++++++++++++++--
> 1 file changed, 24 insertions(+), 2 deletions(-)
>
> diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
> index 21a96e91f0..6cf5d749c7 100644
> --- a/hw/sd/ssi-sd.c
> +++ b/hw/sd/ssi-sd.c
> @@ -99,6 +99,8 @@ OBJECT_DECLARE_SIMPLE_TYPE(ssi_sd_state, SSI_SD)
> static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val)
> {
> ssi_sd_state *s = SSI_SD(dev);
> + SDRequest request;
> + uint8_t longresp[16];
>
> /* Special case: allow CMD12 (STOP TRANSMISSION) while reading data. */
> if (s->mode == SSI_SD_DATA_READ && val == 0x4c) {
> @@ -115,9 +117,31 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev,
> uint32_t val)
> return SSI_DUMMY;
> break;
> case SSI_TOKEN_SINGLE:
> + case SSI_TOKEN_MULTI_WRITE:
> DPRINTF("Start write block\n");
> s->mode = SSI_SD_DATA_WRITE;
> return SSI_DUMMY;
> + case SSI_TOKEN_STOP_TRAN:
> + DPRINTF("Stop multiple write\n");
> +
> + /* manually issue cmd12 to stop the transfer */
> + request.cmd = 12;
> + request.arg = 0;
> + s->arglen = sdbus_do_command(&s->sdbus, &request, longresp);
> + if (s->arglen <= 0) {
> + s->arglen = 1;
> + /* a zero value indicates the card is busy */
> + s->response[0] = 0;
> + DPRINTF("SD card busy\n");
> + } else {
> + s->arglen = 1;
> + /* a non-zero value indicates the card is ready */
> + s->response[0] = SSI_DUMMY;
> + }
> +
> + s->mode = SSI_SD_RESPONSE;
> + s->response_pos = 0;
> + return SSI_DUMMY;
> }
>
> s->cmd = val & 0x3f;
> @@ -126,8 +150,6 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev,
> uint32_t val)
> return SSI_DUMMY;
> case SSI_SD_CMDARG:
> if (s->arglen == 4) {
> - SDRequest request;
> - uint8_t longresp[16];
> /* FIXME: Check CRC. */
> request.cmd = s->cmd;
> request.arg = ldl_be_p(s->cmdarg);
> --
> 2.25.1
>
>
