mmc: at91_mci: support for block size not modulo 4

Implement transfer with size not modulo 4 for at91sam9*. Please note that the
at91rm9200 simply can't handle this.

Signed-off-by: Marc Pignat <marc.pignat@hevs.ch>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/mmc/host/at91_mci.c b/drivers/mmc/host/at91_mci.c
index b9d4ed6b29b1..e40340f32e35 100644
--- a/drivers/mmc/host/at91_mci.c
+++ b/drivers/mmc/host/at91_mci.c
@@ -233,11 +233,11 @@ static void at91_mci_pre_dma_read(struct at91mci_host *host)
 
                 if (i == 0) {
                         at91_mci_write(host, ATMEL_PDC_RPR, sg->dma_address);
-                        at91_mci_write(host, ATMEL_PDC_RCR, sg->length / 4);
+                        at91_mci_write(host, ATMEL_PDC_RCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
                 }
                 else {
                         at91_mci_write(host, ATMEL_PDC_RNPR, sg->dma_address);
-                        at91_mci_write(host, ATMEL_PDC_RNCR, sg->length / 4);
+                        at91_mci_write(host, ATMEL_PDC_RNCR, (data->blksz & 0x3) ? sg->length : sg->length / 4);
                 }
         }
 
@@ -430,7 +430,7 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
 
         if (data) {
 
-                if ( data->blksz & 0x3 ) {
+                if ( cpu_is_at91rm9200() && (data->blksz & 0x3) ) {
                         pr_debug("Unsupported block size\n");
                         cmd->error = -EINVAL;
                         mmc_request_done(host->mmc, host->request);
@@ -482,7 +482,10 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
         } else {
                 /* zero block length and PDC mode */
                 mr = at91_mci_read(host, AT91_MCI_MR) & 0x7fff;
-                at91_mci_write(host, AT91_MCI_MR, mr | (block_length << 16) | AT91_MCI_PDCMODE);
+                mr |= (data->blksz & 0x3) ? AT91_MCI_PDCFBYTE : 0;
+                mr |= (block_length << 16);
+                mr |= AT91_MCI_PDCMODE;
+                at91_mci_write(host, AT91_MCI_MR, mr);
 
                 /*
                  * Disable the PDC controller
@@ -517,7 +520,9 @@ static void at91_mci_send_command(struct at91mci_host *host, struct mmc_command
                                 pr_debug("Transmitting %d bytes\n", host->total_length);
 
                                 at91_mci_write(host, ATMEL_PDC_TPR, host->physical_address);
-                                at91_mci_write(host, ATMEL_PDC_TCR, host->total_length / 4);
+                                at91_mci_write(host, ATMEL_PDC_TCR, (data->blksz & 0x3) ?
+                                                host->total_length : host->total_length / 4);
+
                                 ier = AT91_MCI_CMDRDY;
                         }
                 }