linux-kernel - Re: [PATCH v3 14/20] mtd: nand: qcom: add command elements in BAM transaction

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Message-ID: <3a2c31052ab1c4428997d198e4a25594@codeaurora.org>
Date:   Wed, 09 Aug 2017 13:59:46 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     dwmw2@...radead.org, boris.brezillon@...e-electrons.com,
        computersforpeace@...il.com, marek.vasut@...il.com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     richard@....at, cyrille.pitchen@...ev4u.fr,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        andy.gross@...aro.org, architt@...eaurora.org,
        sricharan@...eaurora.org
Subject: Re: [PATCH v3 14/20] mtd: nand: qcom: add command elements in BAM
 transaction

On 2017-08-05 21:49, Abhishek Sahu wrote:
> All the QPIC register read/write through BAM DMA requires
> command descriptor which contains the array of command elements.
> 
> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>

  This patch has build dependency on
  http://www.spinics.net/lists/dmaengine/msg13665.html

> ---
>  drivers/mtd/nand/qcom_nandc.c | 19 ++++++++++++++++++-
>  1 file changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/qcom_nandc.c 
> b/drivers/mtd/nand/qcom_nandc.c
> index c940a20..9c12404 100644
> --- a/drivers/mtd/nand/qcom_nandc.c
> +++ b/drivers/mtd/nand/qcom_nandc.c
> @@ -22,6 +22,7 @@
>  #include <linux/of.h>
>  #include <linux/of_device.h>
>  #include <linux/delay.h>
> +#include <linux/dma/qcom_bam_dma.h>
> 
>  /* NANDc reg offsets */
>  #define	NAND_FLASH_CMD			0x00
> @@ -198,6 +199,7 @@
>  /* Returns the actual register address for NAND_FLASH_DEV_* */
>  #define nandc_dev_addr(nandc, reg) ((nandc)->props->flash_dev_offset + 
> (reg))
> 
> +#define QPIC_PER_CW_CMD_ELEMENTS	32
>  #define QPIC_PER_CW_CMD_SGL		32
>  #define QPIC_PER_CW_DATA_SGL		8
> 
> @@ -217,8 +219,13 @@
>  /*
>   * This data type corresponds to the BAM transaction which will be 
> used for all
>   * NAND transfers.
> + * @bam_ce - the array of BAM command elements
>   * @cmd_sgl - sgl for NAND BAM command pipe
>   * @data_sgl - sgl for NAND BAM consumer/producer pipe
> + * @bam_ce_pos - the index in bam_ce which is available for next sgl
> + * @bam_ce_start - the index in bam_ce which marks the start position 
> ce
> + *		   for current sgl. It will be used for size calculation
> + *		   for current sgl
>   * @cmd_sgl_pos - current index in command sgl.
>   * @cmd_sgl_start - start index in command sgl.
>   * @tx_sgl_pos - current index in data sgl for tx.
> @@ -227,8 +234,11 @@
>   * @rx_sgl_start - start index in data sgl for rx.
>   */
>  struct bam_transaction {
> +	struct bam_cmd_element *bam_ce;
>  	struct scatterlist *cmd_sgl;
>  	struct scatterlist *data_sgl;
> +	u32 bam_ce_pos;
> +	u32 bam_ce_start;
>  	u32 cmd_sgl_pos;
>  	u32 cmd_sgl_start;
>  	u32 tx_sgl_pos;
> @@ -458,7 +468,8 @@ static void free_bam_transaction(struct
> qcom_nand_controller *nandc)
> 
>  	bam_txn_size =
>  		sizeof(*bam_txn) + num_cw *
> -		((sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL) +
> +		((sizeof(*bam_txn->bam_ce) * QPIC_PER_CW_CMD_ELEMENTS) +
> +		(sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL) +
>  		(sizeof(*bam_txn->data_sgl) * QPIC_PER_CW_DATA_SGL));
> 
>  	bam_txn_buf = devm_kzalloc(nandc->dev, bam_txn_size, GFP_KERNEL);
> @@ -468,6 +479,10 @@ static void free_bam_transaction(struct
> qcom_nand_controller *nandc)
>  	bam_txn = bam_txn_buf;
>  	bam_txn_buf += sizeof(*bam_txn);
> 
> +	bam_txn->bam_ce = bam_txn_buf;
> +	bam_txn_buf +=
> +		sizeof(*bam_txn->bam_ce) * QPIC_PER_CW_CMD_ELEMENTS * num_cw;
> +
>  	bam_txn->cmd_sgl = bam_txn_buf;
>  	bam_txn_buf +=
>  		sizeof(*bam_txn->cmd_sgl) * QPIC_PER_CW_CMD_SGL * num_cw;
> @@ -485,6 +500,8 @@ static void clear_bam_transaction(struct
> qcom_nand_controller *nandc)
>  	if (!nandc->props->is_bam)
>  		return;
> 
> +	bam_txn->bam_ce_pos = 0;
> +	bam_txn->bam_ce_start = 0;
>  	bam_txn->cmd_sgl_pos = 0;
>  	bam_txn->cmd_sgl_start = 0;
>  	bam_txn->tx_sgl_pos = 0;