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mmc: sdhci: add quirks for be to le byte swapping 

Some controller as the ColdFire eshdc may require an endianness
byte swap, because DMA read endianness is not configurable.

Facilitate using the bounce buffer for this by adding
->copy_to_bounce_buffer().

Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20200518191742.1251440-2-angelo.dureghello@timesys.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Angelo Dureghello 2020-05-18 21:17:40 +02:00 committed by Ulf Hansson
parent 991f5c4dd2
commit e93577ecde
2 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/mmc/host/sdhci.c
View File

@ -637,9 +637,13 @@ static int sdhci_pre_dma_transfer(struct sdhci_host *host,
}
if (mmc_get_dma_dir(data) == DMA_TO_DEVICE) {
/* Copy the data to the bounce buffer */
sg_copy_to_buffer(data->sg, data->sg_len,
host->bounce_buffer,
length);
if (host->ops->copy_to_bounce_buffer) {
host->ops->copy_to_bounce_buffer(host,
data, length);
} else {
sg_copy_to_buffer(data->sg, data->sg_len,
host->bounce_buffer, length);
}
}
/* Switch ownership to the DMA */
dma_sync_single_for_device(host->mmc->parent,

3
drivers/mmc/host/sdhci.h
View File

@ -645,6 +645,9 @@ struct sdhci_ops {
void (*voltage_switch)(struct sdhci_host *host);
void (*adma_write_desc)(struct sdhci_host *host, void **desc,
dma_addr_t addr, int len, unsigned int cmd);
void (*copy_to_bounce_buffer)(struct sdhci_host *host,
struct mmc_data *data,
unsigned int length);
void (*request_done)(struct sdhci_host *host,
struct mmc_request *mrq);
};