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sdmmc_host: support multiblock transfers

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Change-Id: I6414028bbafd4ea4ef469f9a387f4bd52ec227e5
This commit is contained in:
Aidan MacDonald 2026-02-06 10:22:25 +00:00
parent acc9c21a78
commit 6da20a18c3
2 changed files with 37 additions and 6 deletions
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40
firmware/drivers/sdmmc_host.c
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@ -677,10 +677,12 @@ static int sdmmc_host_transfer(struct sdmmc_host *host,
if (start + count > host->cardinfo.numblocks)
goto out;
int max_nr_blocks = MAX(host->config.max_nr_blocks, 1);
while (count > 0)
{
/* TODO: multiple block transfers */
int xfer_count = 1;
int xfer_count = count;
if (xfer_count > max_nr_blocks)
xfer_count = max_nr_blocks;
/* Set block length for non-HCS cards */
if (!host->is_hcs_card)
@ -692,15 +694,25 @@ static int sdmmc_host_transfer(struct sdmmc_host *host,
struct sdmmc_host_command cmd = {
.buffer = buf,
.nr_blocks = 1,
.nr_blocks = xfer_count,
.block_len = SD_BLOCK_SIZE,
.flags = SDMMC_RESP_SHORT | data_dir,
};
if (data_dir == SDMMC_DATA_WRITE)
cmd.command = SD_WRITE_BLOCK;
if (xfer_count > 1)
{
if (data_dir == SDMMC_DATA_WRITE)
cmd.command = SD_WRITE_MULTIPLE_BLOCK;
else
cmd.command = SD_READ_MULTIPLE_BLOCK;
}
else
cmd.command = SD_READ_SINGLE_BLOCK;
{
if (data_dir == SDMMC_DATA_WRITE)
cmd.command = SD_WRITE_BLOCK;
else
cmd.command = SD_READ_SINGLE_BLOCK;
}
if (host->cardinfo.sd2plus)
cmd.argument = start;
@ -711,6 +723,22 @@ static int sdmmc_host_transfer(struct sdmmc_host *host,
if (rc)
goto out;
/*
* NOTE: some controllers can send CMD12 automatically after
* the end of a transfer, eg. X1000; it might be worth
* supporting that via a feature flag.
*/
if (xfer_count > 1)
{
memset(&cmd, 0, sizeof(cmd));
cmd.command = SD_STOP_TRANSMISSION;
cmd.flags = SDMMC_RESP_SHORT | SDMMC_RESP_BUSY;
rc = sdmmc_host_submit_cmd(host, &cmd, NULL);
if (rc)
goto out;
}
buf += xfer_count * SD_BLOCK_SIZE;
start += xfer_count;
count -= xfer_count;