SCSI is read-only. We ideally should be checking this bit and then
set the ECSI accordingly, rather than setting both ECSI and SCSI.
- Alagu Sankar
On Tue, Mar 30, 2010 at 11:08 PM, Daniel Mack <daniel@xxxxxxxx> 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@xxxxxxxx>
> Cc: Alagu Sankar <alagusankar@xxxxxxxxxxx>
> Cc: Volker Ernst <volker.ernst@xxxxxxxx>
> Cc: Dan Williams <dcbw@xxxxxxxxxx>
> Cc: John W. Linville <linville@xxxxxxxxxxxxx>
> Cc: Holger Schurig <hs4233@xxxxxxxxxxxxxxxxxxxx>
> Cc: Bing Zhao <bzhao@xxxxxxxxxxx>
> Cc: libertas-dev@xxxxxxxxxxxxxxxxxxx
> Cc: linux-wireless@xxxxxxxxxxxxxxx
> Cc: linux-mmc@xxxxxxxxxxxxxxx
> ---
> 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
>
>
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