Subject: [PATCH v2 1/3] mtd: atmel_nand: add NFC status error check

From: [email-masked] (Josh Wu)
Date: Wed, 16 Jul 2014 18:06:26 +0800

On 6/10/2014 5:50 PM, Josh Wu wrote:
> Add a new function to read the NFC status. Meantime, this function will
> theck if there is any errors in NFC.
>
> Signed-off-by: Josh Wu <[email-masked]>

Tested-by: Matthieu Crapet <[email-masked]>

I add a Tested-by tag from Matthieu Crapet.
He didn't reply this email thread directly. His test-by tag is in 
email:http://lists.infradead.org/pipermail/linux-mtd/2014-June/054443.html

Best Regards,
Josh Wu

> ---
>   drivers/mtd/nand/atmel_nand.c     |   24 +++++++++++++++++++++++-
>   drivers/mtd/nand/atmel_nand_nfc.h |    4 ++++
>   2 files changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> index ec97ccb..25d9921 100644
> --- a/drivers/mtd/nand/atmel_nand.c
> +++ b/drivers/mtd/nand/atmel_nand.c
> @@ -1572,6 +1572,25 @@ static int atmel_hw_nand_init_params(struct platform_device *pdev,
>   	return 0;
>   }
>   
> +static inline u32 nfc_read_status(struct atmel_nand_host *host)
> +{
> +	u32 err_flags = NFC_SR_DTOE | NFC_SR_UNDEF | NFC_SR_AWB | NFC_SR_ASE;
> +	u32 nfc_status = nfc_readl(host->nfc->hsmc_regs, SR);
> +
> +	if (unlikely(nfc_status & err_flags)) {
> +		if (nfc_status & NFC_SR_DTOE)
> +			dev_err(host->dev, "NFC: Waiting Nand R/B Timeout Error\n");
> +		else if (nfc_status & NFC_SR_UNDEF)
> +			dev_err(host->dev, "NFC: Access Undefined Area Error\n");
> +		else if (nfc_status & NFC_SR_AWB)
> +			dev_err(host->dev, "NFC: Access memory While NFC is busy\n");
> +		else if (nfc_status & NFC_SR_ASE)
> +			dev_err(host->dev, "NFC: Access memory Size Error\n");
> +	}
> +
> +	return nfc_status;
> +}
> +
>   /* SMC interrupt service routine */
>   static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
>   {
> @@ -1579,7 +1598,7 @@ static irqreturn_t hsmc_interrupt(int irq, void *dev_id)
>   	u32 status, mask, pending;
>   	irqreturn_t ret = IRQ_HANDLED;
>   
> -	status = nfc_readl(host->nfc->hsmc_regs, SR);
> +	status = nfc_read_status(host);
>   	mask = nfc_readl(host->nfc->hsmc_regs, IMR);
>   	pending = status & mask;
>   
> @@ -2210,6 +2229,9 @@ static int atmel_nand_nfc_probe(struct platform_device *pdev)
>   		}
>   	}
>   
> +	nfc_writel(nfc->hsmc_regs, IDR, 0xffffffff);
> +	nfc_readl(nfc->hsmc_regs, SR);	/* clear the NFC_SR */
> +
>   	nfc->is_initialized = true;
>   	dev_info(&pdev->dev, "NFC is probed.\n");
>   	return 0;
> diff --git a/drivers/mtd/nand/atmel_nand_nfc.h b/drivers/mtd/nand/atmel_nand_nfc.h
> index 4efd117..85b8ca6 100644
> --- a/drivers/mtd/nand/atmel_nand_nfc.h
> +++ b/drivers/mtd/nand/atmel_nand_nfc.h
> @@ -37,6 +37,10 @@
>   #define ATMEL_HSMC_NFC_SR	0x08		/* NFC Status Register */
>   #define		NFC_SR_XFR_DONE		(1 << 16)
>   #define		NFC_SR_CMD_DONE		(1 << 17)
> +#define		NFC_SR_DTOE		(1 << 20)
> +#define		NFC_SR_UNDEF		(1 << 21)
> +#define		NFC_SR_AWB		(1 << 22)
> +#define		NFC_SR_ASE		(1 << 23)
>   #define		NFC_SR_RB_EDGE		(1 << 24)
>   
>   #define ATMEL_HSMC_NFC_IER	0x0c