FSL eSDHC controllers can support maximum block size up to 4096
bytes. The MBL (Maximum Block Length) field in the capabilities
register extended by one bit, and bits 13:15 in the block size
register reserved.
Signed-off-by: Anton Vorontsov <avoront...@ru.mvista.com>
---
drivers/mmc/host/sdhci.c | 28 ++++++++++++++++++++--------
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 22 insertions(+), 8 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b308dbf..b341a9a 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -682,6 +682,7 @@ static void sdhci_set_transfer_irqs(struct sdhci_host *host)
static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data)
{
+ u16 blksz;
u8 count;
u8 ctrl;
int ret;
@@ -831,7 +832,12 @@ static void sdhci_prepare_data(struct sdhci_host *host,
struct mmc_data *data)
sdhci_set_transfer_irqs(host);
/* We do not handle DMA boundaries, so set it to max (512 KiB) */
- sdhci_writew(host, SDHCI_MAKE_BLKSZ(7, data->blksz), SDHCI_BLOCK_SIZE);
+ if (host->quirks & SDHCI_QUIRK_MAX_BLK_SZ_4096)
+ blksz = data->blksz;
+ else
+ blksz = SDHCI_MAKE_BLKSZ(7, data->blksz);
+
+ sdhci_writew(host, blksz, SDHCI_BLOCK_SIZE);
sdhci_writew(host, data->blocks, SDHCI_BLOCK_COUNT);
}
@@ -1840,13 +1846,19 @@ int sdhci_add_host(struct sdhci_host *host)
* Maximum block size. This varies from controller to controller and
* is specified in the capabilities register.
*/
- mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >>
SDHCI_MAX_BLOCK_SHIFT;
- if (mmc->max_blk_size >= 3) {
- printk(KERN_WARNING "%s: Invalid maximum block size, "
- "assuming 512 bytes\n", mmc_hostname(mmc));
- mmc->max_blk_size = 512;
- } else
- mmc->max_blk_size = 512 << mmc->max_blk_size;
+ if (host->quirks & SDHCI_QUIRK_MAX_BLK_SZ_4096) {
+ mmc->max_blk_size = 3;
+ } else {
+ mmc->max_blk_size = (caps & SDHCI_MAX_BLOCK_MASK) >>
+ SDHCI_MAX_BLOCK_SHIFT;
+ if (mmc->max_blk_size >= 3) {
+ printk(KERN_WARNING "%s: Invalid maximum block size, "
+ "assuming 512 bytes\n", mmc_hostname(mmc));
+ mmc->max_blk_size = 0;
+ }
+ }
+
+ mmc->max_blk_size = 512 << mmc->max_blk_size;
/*
* Maximum block count.
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 5c5a950..c8628b4 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -231,6 +231,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_PIO_NEEDS_DELAY (1<<20)
/* Controller losing signal/interrupt enable states after reset */
#define SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET (1<<21)
+/* Controller supports nonstandard maximum block length of 4096 bytes */
+#define SDHCI_QUIRK_MAX_BLK_SZ_4096 (1<<22)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
--
1.5.6.5
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