mmc: remove multiwrite capability

[linux-2.6] / drivers / mmc / host / pxamci.c

diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index 1ea8482037bb8551b0a64efbde57825ecedaf406..d39f59738866c02e8712b9d3eb6cc686de808382 100644 (file)
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -114,6 +114,7 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
        unsigned int nob = data->blocks;
        unsigned long long clks;
        unsigned int timeout;
+       bool dalgn = 0;
        u32 dcmd;
        int i;
 
@@ -152,6 +153,9 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
                host->sg_cpu[i].dcmd = dcmd | length;
                if (length & 31 && !(data->flags & MMC_DATA_READ))
                        host->sg_cpu[i].dcmd |= DCMD_ENDIRQEN;
+               /* Not aligned to 8-byte boundary? */
+               if (sg_dma_address(&data->sg[i]) & 0x7)
+                       dalgn = 1;
                if (data->flags & MMC_DATA_READ) {
                        host->sg_cpu[i].dsadr = host->res->start + MMC_RXFIFO;
                        host->sg_cpu[i].dtadr = sg_dma_address(&data->sg[i]);
@@ -165,6 +169,15 @@ static void pxamci_setup_data(struct pxamci_host *host, struct mmc_data *data)
        host->sg_cpu[host->dma_len - 1].ddadr = DDADR_STOP;
        wmb();
 
+       /*
+        * The PXA27x DMA controller encounters overhead when working with
+        * unaligned (to 8-byte boundaries) data, so switch on byte alignment
+        * mode only if we have unaligned data.
+        */
+       if (dalgn)
+               DALGN |= (1 << host->dma);
+       else
+               DALGN &= (1 << host->dma);
        DDADR(host->dma) = host->sg_dma;
        DCSR(host->dma) = DCSR_RUN;
 }
@@ -361,9 +374,12 @@ static int pxamci_get_ro(struct mmc_host *mmc)
        struct pxamci_host *host = mmc_priv(mmc);
 
        if (host->pdata && host->pdata->get_ro)
-               return host->pdata->get_ro(mmc_dev(mmc));
-       /* Host doesn't support read only detection so assume writeable */
-       return 0;
+               return !!host->pdata->get_ro(mmc_dev(mmc));
+       /*
+        * Board doesn't support read only detection; let the mmc core
+        * decide what to do.
+        */
+       return -ENOSYS;
 }
 
 static void pxamci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
@@ -693,6 +709,7 @@ static struct platform_driver pxamci_driver = {
        .resume         = pxamci_resume,
        .driver         = {
                .name   = DRIVER_NAME,
+               .owner  = THIS_MODULE,
        },
 };
 
@@ -711,3 +728,4 @@ module_exit(pxamci_exit);
 
 MODULE_DESCRIPTION("PXA Multimedia Card Interface Driver");
 MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-mci");