From: Bin Shi <[email protected]> some controllers share data bus or other pins between multi-controllers and need to switch the functions of shared pins runtime this patch requested those shared pins before actual hardware access and release them after access
Signed-off-by: Bin Shi <[email protected]> Cc: Binghua Duan <[email protected]> Signed-off-by: Barry Song <[email protected]> --- drivers/mmc/host/sdhci.c | 13 +++++++++++++ drivers/mmc/host/sdhci.h | 2 ++ include/linux/mmc/sdhci.h | 2 ++ 3 files changed, 17 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index f31077d..7b07152 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1379,6 +1379,13 @@ static void sdhci_tasklet_finish(unsigned long param) sdhci_reset(host, SDHCI_RESET_DATA); } + /* + * some controllers share data bus or other pins between multi-controller + * and need to switch the function of pins runtime + */ + if (host->quirks & SDHCI_QUIRK_SHARED_PINS) + host->ops->get_shared_pins(host); + host->mrq = NULL; host->cmd = NULL; host->data = NULL; @@ -1391,6 +1398,12 @@ static void sdhci_tasklet_finish(unsigned long param) spin_unlock_irqrestore(&host->lock, flags); mmc_request_done(host->mmc, mrq); + + /* + * release shared pins so that other controllers can use them + */ + if (host->quirks & SDHCI_QUIRK_SHARED_PINS) + host->ops->get_shared_pins(host); } static void sdhci_timeout_timer(unsigned long data) diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 85750a9..9d918a5 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -229,6 +229,8 @@ struct sdhci_ops { void (*platform_send_init_74_clocks)(struct sdhci_host *host, u8 power_mode); unsigned int (*get_ro)(struct sdhci_host *host); + unsigned int (*get_shared_pins)(struct sdhci_host *host); + unsigned int (*put_shared_pins)(struct sdhci_host *host); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h index 83bd9f7..32ab422 100644 --- a/include/linux/mmc/sdhci.h +++ b/include/linux/mmc/sdhci.h @@ -85,6 +85,8 @@ struct sdhci_host { #define SDHCI_QUIRK_NO_HISPD_BIT (1<<29) /* Controller treats ADMA descriptors with length 0000h incorrectly */ #define SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC (1<<30) +/* Controller shared data bus or other pins with other controllers */ +#define SDHCI_QUIRK_SHARED_PINS (1<<31) int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped address */ -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
