s3cmci: add SDIO IRQ support

The controller supports SDIO IRQ detection so add support for hardware
assisted SDIO interrupt detection for the SDIO core.  This improves the
response time for SDIO interrupts and thus the transfer rate from devices
such as the Marvel 8686.

As a note, it does seem that the controller will miss an IRQ than is held
asserted, so there are some manual checks to see if the SDIO interrupt is
active after a transfer.

Major testing on the S3C2440.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index fc96194a06f4..62fac6602306 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -42,6 +42,11 @@ struct s3cmci_host {
         int                     dodma;
         int                     dmatogo;
 
+        bool                    irq_disabled;
+        bool                    irq_enabled;
+        bool                    irq_state;
+        int                     sdio_irqen;
+
         struct mmc_request      *mrq;
         int                     cmd_is_stop;