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[MMC] mmci: add data cache coherency 

Since MMCI currently uses PIO to read data, we have to take steps
to ensure data cache coherency on aliasing CPU caches.  Add the
necessary flush_dcache_page() calls.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2006-01-04 16:24:05 +00:00 committed by Russell King
parent ce11a161c1
commit e9c091b474
1 changed files with 15 additions and 0 deletions
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15
drivers/mmc/mmci.c
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@ -20,6 +20,7 @@
#include <linux/mmc/host.h>
#include <linux/mmc/protocol.h>
#include <asm/cacheflush.h>
#include <asm/div64.h>
#include <asm/io.h>
#include <asm/scatterlist.h>
@ -157,6 +158,13 @@ mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
else if (status & (MCI_TXUNDERRUN|MCI_RXOVERRUN))
data->error = MMC_ERR_FIFO;
status |= MCI_DATAEND;
/*
* We hit an error condition. Ensure that any data
* partially written to a page is properly coherent.
*/
if (host->sg_len && data->flags & MMC_DATA_READ)
flush_dcache_page(host->sg_ptr->page);
}
if (status & MCI_DATAEND) {
mmci_stop_data(host);
@ -301,6 +309,13 @@ static irqreturn_t mmci_pio_irq(int irq, void *dev_id, struct pt_regs *regs)
if (remain)
break;
/*
* If we were reading, and we have completed this
* page, ensure that the data cache is coherent.
*/
if (status & MCI_RXACTIVE)
flush_dcache_page(host->sg_ptr->page);
if (!mmci_next_sg(host))
break;