Subject: [PATCH] mmc: dw_mmc: add a quirk for the defferent bit of sdio interrupt

From: [email-masked] (Jaehoon Chung)
Date: Thu, 30 Oct 2014 13:35:16 +0900

Hi, Addy.

On 10/30/2014 11:21 AM, Addy Ke wrote:
> This patch add a quirk: DW_MCI_QUIRK_SDIO_INT_24BIT.
> 
> The bit of sdio interrupt is 16 in designware implementation, but
> is 24 in RK3288. To support RK3288 mmc controller, we need add
> a quirk for it.
> 
> Signed-off-by: Addy Ke <[email-masked]>
> ---
>  drivers/mmc/host/dw_mmc.c  | 32 +++++++++++++++++++++++++++-----
>  drivers/mmc/host/dw_mmc.h  |  1 +
>  include/linux/mmc/dw_mmc.h |  2 ++
>  3 files changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 69f0cc6..db29621 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -778,6 +778,12 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
>  	u32 div;
>  	u32 clk_en_a;
>  	u32 sdmmc_cmd_bits = SDMMC_CMD_UPD_CLK | SDMMC_CMD_PRV_DAT_WAIT;
> +	u32 sdio_int_bit;
> +
> +	if (host->quirks & DW_MCI_QUIRK_SDIO_INT_24BIT)

I want to change the quirk naming.
If rockchip may use the other bit for sdio_int in future,
then you need to add the DW_MCI_QUIRK_SDIO_INT_xxBIT.?

How about DW_MCI_BROKEN_SDIO_INT_BIT?
And Could you consider to control with more general method than now?

Best Regards,
Jaehoon Chung

> +		sdio_int_bit = SDMMC_INT_SDIO_24BIT(slot->id);
> +	else
> +		sdio_int_bit = SDMMC_INT_SDIO(slot->id);
>  
>  	/* We must continue to set bit 28 in CMD until the change is complete */
>  	if (host->state == STATE_WAITING_CMD11_DONE)
> @@ -819,7 +825,7 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot, bool force_clkinit)
>  
>  		/* enable clock; only low power if no SDIO */
>  		clk_en_a = SDMMC_CLKEN_ENABLE << slot->id;
> -		if (!(mci_readl(host, INTMASK) & SDMMC_INT_SDIO(slot->id)))
> +		if (!(mci_readl(host, INTMASK) & sdio_int_bit))
>  			clk_en_a |= SDMMC_CLKEN_LOW_PWR << slot->id;
>  		mci_writel(host, CLKENA, clk_en_a);
>  
> @@ -1167,6 +1173,12 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
>  	struct dw_mci_slot *slot = mmc_priv(mmc);
>  	struct dw_mci *host = slot->host;
>  	u32 int_mask;
> +	u32 sdio_int_bit;
> +
> +	if (host->quirks & DW_MCI_QUIRK_SDIO_INT_24BIT)
> +		sdio_int_bit = SDMMC_INT_SDIO_24BIT(slot->id);
> +	else
> +		sdio_int_bit = SDMMC_INT_SDIO(slot->id);
>  
>  	/* Enable/disable Slot Specific SDIO interrupt */
>  	int_mask = mci_readl(host, INTMASK);
> @@ -1180,10 +1192,10 @@ static void dw_mci_enable_sdio_irq(struct mmc_host *mmc, int enb)
>  		dw_mci_disable_low_power(slot);
>  
>  		mci_writel(host, INTMASK,
> -			   (int_mask | SDMMC_INT_SDIO(slot->id)));
> +			   (int_mask | sdio_int_bit));
>  	} else {
>  		mci_writel(host, INTMASK,
> -			   (int_mask & ~SDMMC_INT_SDIO(slot->id)));
> +			   (int_mask & ~sdio_int_bit));
>  	}
>  }
>  
> @@ -2035,8 +2047,15 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
>  		/* Handle SDIO Interrupts */
>  		for (i = 0; i < host->num_slots; i++) {
>  			struct dw_mci_slot *slot = host->slot[i];
> -			if (pending & SDMMC_INT_SDIO(i)) {
> -				mci_writel(host, RINTSTS, SDMMC_INT_SDIO(i));
> +			u32 sdio_int_bit;
> +
> +			if (host->quirks & DW_MCI_QUIRK_SDIO_INT_24BIT)
> +				sdio_int_bit = SDMMC_INT_SDIO_24BIT(i);
> +			else
> +				sdio_int_bit = SDMMC_INT_SDIO(i);
> +
> +			if (pending & sdio_int_bit) {
> +				mci_writel(host, RINTSTS, sdio_int_bit);
>  				mmc_signal_sdio_irq(slot->mmc);
>  			}
>  		}
> @@ -2452,6 +2471,9 @@ static struct dw_mci_of_quirks {
>  	}, {
>  		.quirk	= "disable-wp",
>  		.id	= DW_MCI_QUIRK_NO_WRITE_PROTECT,
> +	}, {
> +		.quirk	= "sdio-int-24bit",
> +		.id	= DW_MCI_QUIRK_SDIO_INT_24BIT,
>  	},
>  };
>  
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 01b99e8..6a48015 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -92,6 +92,7 @@
>  #define SDMMC_CTYPE_4BIT		BIT(0)
>  #define SDMMC_CTYPE_1BIT		0
>  /* Interrupt status & mask register defines */
> +#define SDMMC_INT_SDIO_24BIT(n)		BIT(24 + (n))
>  #define SDMMC_INT_SDIO(n)		BIT(16 + (n))
>  #define SDMMC_INT_EBE			BIT(15)
>  #define SDMMC_INT_ACD			BIT(14)
> diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
> index 0013669..6d4669e 100644
> --- a/include/linux/mmc/dw_mmc.h
> +++ b/include/linux/mmc/dw_mmc.h
> @@ -217,6 +217,8 @@ struct dw_mci_dma_ops {
>  #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(3)
>  /* No write protect */
>  #define DW_MCI_QUIRK_NO_WRITE_PROTECT		BIT(4)
> +/* In RK3288, the bit of sdio interrupt is 24 */
> +#define DW_MCI_QUIRK_SDIO_INT_24BIT		BIT(5)
>  
>  /* Slot level quirks */
>  /* This slot has no write protect */
>