> On Tue, Mar 30, 2010 at 11:08 PM, Daniel Mack <daniel@caiaq.de> wrote:
> > When operating in 1-bit mode, SDAT1 is used as dedicated interrupt line.
> > However, the 8686 will only drive this line when the ECSI and SCSI bits
> > are set in the CCCR_IF register.
> >
> > Thanks to Alagu Sankar for pointing me in the right direction.
> >
> > Signed-off-by: Daniel Mack <daniel@caiaq.de>
> > Cc: Alagu Sankar <alagusankar@embwise.com>
> > Cc: Volker Ernst <volker.ernst@txtr.com>
> > Cc: Dan Williams <dcbw@redhat.com>
> > Cc: John W. Linville <linville@tuxdriver.com>
> > Cc: Holger Schurig <hs4233@mail.mn-solutions.de>
> > Cc: Bing Zhao <bzhao@marvell.com>
> > Cc:
libertas-dev@lists.infradead.org
> > Cc:
linux-wireless@vger.kernel.org
> > Cc:
linux-mmc@vger.kernel.org
> > ---
> > drivers/net/wireless/libertas/if_sdio.c | 24 ++++++++++++++++++++++++
> > include/linux/mmc/sdio.h | 2 ++
> > 2 files changed, 26 insertions(+), 0 deletions(-)
> >
> > diff --git a/drivers/net/wireless/libertas/if_sdio.c b/drivers/net/wireless/libertas/if_sdio.c
> > index 7a73f62..d3170f2 100644
> > --- a/drivers/net/wireless/libertas/if_sdio.c
> > +++ b/drivers/net/wireless/libertas/if_sdio.c
> > @@ -34,6 +34,8 @@
> > #include <linux/mmc/card.h>
> > #include <linux/mmc/sdio_func.h>
> > #include <linux/mmc/sdio_ids.h>
> > +#include <linux/mmc/sdio.h>
> > +#include <linux/mmc/host.h>
> >
> > #include "host.h"
> > #include "decl.h"
> > @@ -942,6 +944,7 @@ static int if_sdio_probe(struct sdio_func *func,
> > int ret, i;
> > unsigned int model;
> > struct if_sdio_packet *packet;
> > + struct mmc_host *host = func->card->host;
> >
> > lbs_deb_enter(LBS_DEB_SDIO);
> >
> > @@ -1022,6 +1025,27 @@ static int if_sdio_probe(struct sdio_func *func,
> > if (ret)
> > goto disable;
> >
> > + /* For 1-bit transfers, we need to enable the interrupt flags in
> > + * the CCCR register. Temporarily set the function number to 0
> > + * for that. */
> > + if ((host->caps & MMC_CAP_SDIO_IRQ) &&
> > + (host->ios.bus_width == MMC_BUS_WIDTH_1)) {
> > + unsigned int num = func->num;
> > + u8 reg;
> > +
> > + func->num = 0;
> > + reg = sdio_readb(func, SDIO_CCCR_IF, &ret);
> > + if (ret)
> > + goto release_int;
> > +
> > + reg |= SDIO_BUS_ECSI | SDIO_BUS_SCSI;
> > + sdio_writeb(func, reg, SDIO_CCCR_IF, &ret);
> > + if (ret)
> > + goto release_int;
> > +
> > + func->num = num;
> > + }
> > +
> > card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
> > if (ret)
> > goto release_int;
> > diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
> > index 0ebaef5..329a8fa 100644
> > --- a/include/linux/mmc/sdio.h
> > +++ b/include/linux/mmc/sdio.h
> > @@ -94,6 +94,8 @@
> >
> > #define SDIO_BUS_WIDTH_1BIT 0x00
> > #define SDIO_BUS_WIDTH_4BIT 0x02
> > +#define SDIO_BUS_ECSI 0x20 /* Enable continuous SPI interrupt */
> > +#define SDIO_BUS_SCSI 0x40 /* Support continuous SPI interrupt */
> >
> > #define SDIO_BUS_ASYNC_INT 0x20
> >
> > --
> > 1.7.0
> >
> >
