Hi Jerry,
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of [email protected]
> Sent: Monday, December 05, 2011 5:24 PM
> To: [email protected]
> Cc: Jerry Huang
> Subject: [PATCH 1/4] SDHCI: add sdhci_get_cd callback to detect the card
>
> From: Jerry Huang <[email protected]>
>
> 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) and bit15(CINS).
>
> Signed-off-by: Jerry Huang <[email protected]>
> ---
> drivers/mmc/host/sdhci.c | 20 ++++++++++++++++++++
> drivers/mmc/host/sdhci.h | 1 +
> 2 files changed, 21 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 6d8eea3..66afd82 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2,6 +2,7 @@
> * linux/drivers/mmc/host/sdhci.c - Secure Digital Host Controller Interface
> driver
> *
> * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
> + * Copyright (C) 2011 Freescale Semiconductor Inc.
> *
> * This program is free software; you can redistribute it and/or modify
> * it under the terms of the GNU General Public License as published by
> @@ -1518,6 +1519,24 @@ static int sdhci_get_ro(struct mmc_host *mmc)
> return ret;
> }
>
> +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);
As far as I know, some SDHC host controller didn't implement its present
register well...The present register of some SDHC host controller will report
"there is a card" forever. So, according to your patch2, using such method is
not a proper solution for card detection, I think.
Thanks
Chuanxiao
> +
> + spin_unlock_irqrestore(&host->lock, flags);
> +
> + return (present & (SDHCI_CARD_PRESENT | SDHCI_CARD_CDPL));
> +}
> +
> static void sdhci_enable_sdio_irq_nolock(struct sdhci_host *host, int enable)
> {
> if (host->flags & SDHCI_DEVICE_DEAD)
> @@ -1884,6 +1903,7 @@ 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,
> .hw_reset = sdhci_hw_reset,
> .enable_sdio_irq = sdhci_enable_sdio_irq,
> .start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 0a5b654..8ea7e00 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -69,6 +69,7 @@
> #define SDHCI_SPACE_AVAILABLE 0x00000400
> #define SDHCI_DATA_AVAILABLE 0x00000800
> #define SDHCI_CARD_PRESENT 0x00010000
> +#define SDHCI_CARD_CDPL 0x00040000
> #define SDHCI_WRITE_PROTECT 0x00080000
> #define SDHCI_DATA_LVL_MASK 0x00F00000
> #define SDHCI_DATA_LVL_SHIFT 20
> --
> 1.7.5.4
>
>
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