Dear all,
Have any advice about these patchs for SDHC?
Thanks and Best Regards
Jerry Huang
Beijing office, Freescale Semiconductor
> -----Original Message-----
> From: Huang Changming-R66093
> Sent: Friday, December 04, 2009 3:55 PM
> To: linux-mmc@xxxxxxxxxxxxxxx
> Cc: Huang Changming-R66093
> Subject: [PATCH 2/3] SDHCI: add sdhci_get_cd callback to
> detect the card
>
> From: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
>
> Add callback function sdhci_get_cd to detect the card.
>
> In order to check if the card is present, we will read the
> PRESENT STATE register and check the bit13 (Card detect pin level).
>
> Signed-off-by: Jerry Huang <Chang-Ming.Huang@xxxxxxxxxxxxx>
> ---
> drivers/mmc/host/sdhci.c | 19 +++++++++++++++++++
> drivers/mmc/host/sdhci.h | 2 +-
> 2 files changed, 20 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c
> b/drivers/mmc/host/sdhci.c index 711cbcd..e5ac64b 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1205,6 +1205,24 @@ static int sdhci_get_ro(struct mmc_host *mmc)
> return !(present & SDHCI_WRITE_PROTECT); }
>
> +static int sdhci_get_cd(struct mmc_host *mmc) {
> + struct sdhci_host *host = mmc_priv(mmc);
> + unsigned long flags;
> + int present;
> +
> + spin_lock_irqsave(&host->lock, flags);
> +
> + if (host->flags & SDHCI_DEVICE_DEAD)
> + present = 0;
> + else
> + present = sdhci_readl(host, SDHCI_PRESENT_STATE);
> +
> + spin_unlock_irqrestore(&host->lock, flags);
> +
> + return (present & SDHCI_CARD_PRESENT); }
> +
> static void sdhci_enable_sdio_irq(struct mmc_host *mmc, int
> enable) {
> struct sdhci_host *host;
> @@ -1231,6 +1249,7 @@ static const struct mmc_host_ops sdhci_ops = {
> .request = sdhci_request,
> .set_ios = sdhci_set_ios,
> .get_ro = sdhci_get_ro,
> + .get_cd = sdhci_get_cd,
> .enable_sdio_irq = sdhci_enable_sdio_irq, };
>
> diff --git a/drivers/mmc/host/sdhci.h
> b/drivers/mmc/host/sdhci.h index cb8beea..438d32d 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -58,7 +58,7 @@
> #define SDHCI_DOING_READ 0x00000200
> #define SDHCI_SPACE_AVAILABLE 0x00000400
> #define SDHCI_DATA_AVAILABLE 0x00000800
> -#define SDHCI_CARD_PRESENT 0x00010000
> +#define SDHCI_CARD_PRESENT 0x00060000
> #define SDHCI_WRITE_PROTECT 0x00080000
>
> #define SDHCI_HOST_CONTROL 0x28
> --
> 1.6.4
>
>
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