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Date:   Wed, 15 Jun 2022 22:41:32 +0530
From:   Manivannan Sadhasivam <mani@kernel.org>
To:     Ansuel Smith <ansuelsmth@gmail.com>
Cc:     Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        linux-mtd@lists.infradead.org, linux-arm-msm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v7 1/3] mtd: nand: raw: qcom_nandc: reorder
 qcom_nand_host struct
Message-ID: <20220615171132.GA3606@thinkpad>
References: <20220615000612.3119-1-ansuelsmth@gmail.com>
 <20220615000612.3119-2-ansuelsmth@gmail.com>
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On Wed, Jun 15, 2022 at 02:06:10AM +0200, Ansuel Smith wrote:
> Reorder structs in nandc driver to save holes.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

Thanks,
Mani

> ---
>  drivers/mtd/nand/raw/qcom_nandc.c | 107 +++++++++++++++++-------------
>  1 file changed, 62 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
> index 1a77542c6d67..f2990d721733 100644
> --- a/drivers/mtd/nand/raw/qcom_nandc.c
> +++ b/drivers/mtd/nand/raw/qcom_nandc.c
> @@ -238,6 +238,9 @@ nandc_set_reg(chip, reg,			\
>   * @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
> + * @last_data_desc - last DMA desc in data channel (tx/rx).
> + * @last_cmd_desc - last DMA desc in command channel.
> + * @txn_done - completion for NAND transfer.
>   * @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
> @@ -250,14 +253,14 @@ nandc_set_reg(chip, reg,			\
>   * @rx_sgl_start - start index in data sgl for rx.
>   * @wait_second_completion - wait for second DMA desc completion before making
>   *			     the NAND transfer completion.
> - * @txn_done - completion for NAND transfer.
> - * @last_data_desc - last DMA desc in data channel (tx/rx).
> - * @last_cmd_desc - last DMA desc in command channel.
>   */
>  struct bam_transaction {
>  	struct bam_cmd_element *bam_ce;
>  	struct scatterlist *cmd_sgl;
>  	struct scatterlist *data_sgl;
> +	struct dma_async_tx_descriptor *last_data_desc;
> +	struct dma_async_tx_descriptor *last_cmd_desc;
> +	struct completion txn_done;
>  	u32 bam_ce_pos;
>  	u32 bam_ce_start;
>  	u32 cmd_sgl_pos;
> @@ -267,25 +270,23 @@ struct bam_transaction {
>  	u32 rx_sgl_pos;
>  	u32 rx_sgl_start;
>  	bool wait_second_completion;
> -	struct completion txn_done;
> -	struct dma_async_tx_descriptor *last_data_desc;
> -	struct dma_async_tx_descriptor *last_cmd_desc;
>  };
>  
>  /*
>   * This data type corresponds to the nand dma descriptor
> + * @dma_desc - low level DMA engine descriptor
>   * @list - list for desc_info
> - * @dir - DMA transfer direction
> + *
>   * @adm_sgl - sgl which will be used for single sgl dma descriptor. Only used by
>   *	      ADM
>   * @bam_sgl - sgl which will be used for dma descriptor. Only used by BAM
>   * @sgl_cnt - number of SGL in bam_sgl. Only used by BAM
> - * @dma_desc - low level DMA engine descriptor
> + * @dir - DMA transfer direction
>   */
>  struct desc_info {
> +	struct dma_async_tx_descriptor *dma_desc;
>  	struct list_head node;
>  
> -	enum dma_data_direction dir;
>  	union {
>  		struct scatterlist adm_sgl;
>  		struct {
> @@ -293,7 +294,7 @@ struct desc_info {
>  			int sgl_cnt;
>  		};
>  	};
> -	struct dma_async_tx_descriptor *dma_desc;
> +	enum dma_data_direction dir;
>  };
>  
>  /*
> @@ -337,52 +338,64 @@ struct nandc_regs {
>  /*
>   * NAND controller data struct
>   *
> - * @controller:			base controller structure
> - * @host_list:			list containing all the chips attached to the
> - *				controller
>   * @dev:			parent device
> + *
>   * @base:			MMIO base
> - * @base_phys:			physical base address of controller registers
> - * @base_dma:			dma base address of controller registers
> + *
>   * @core_clk:			controller clock
>   * @aon_clk:			another controller clock
>   *
> + * @regs:			a contiguous chunk of memory for DMA register
> + *				writes. contains the register values to be
> + *				written to controller
> + *
> + * @props:			properties of current NAND controller,
> + *				initialized via DT match data
> + *
> + * @controller:			base controller structure
> + * @host_list:			list containing all the chips attached to the
> + *				controller
> + *
>   * @chan:			dma channel
>   * @cmd_crci:			ADM DMA CRCI for command flow control
>   * @data_crci:			ADM DMA CRCI for data flow control
> + *
>   * @desc_list:			DMA descriptor list (list of desc_infos)
>   *
>   * @data_buffer:		our local DMA buffer for page read/writes,
>   *				used when we can't use the buffer provided
>   *				by upper layers directly
> - * @buf_size/count/start:	markers for chip->legacy.read_buf/write_buf
> - *				functions
>   * @reg_read_buf:		local buffer for reading back registers via DMA
> + *
> + * @base_phys:			physical base address of controller registers
> + * @base_dma:			dma base address of controller registers
>   * @reg_read_dma:		contains dma address for register read buffer
> - * @reg_read_pos:		marker for data read in reg_read_buf
>   *
> - * @regs:			a contiguous chunk of memory for DMA register
> - *				writes. contains the register values to be
> - *				written to controller
> - * @cmd1/vld:			some fixed controller register values
> - * @props:			properties of current NAND controller,
> - *				initialized via DT match data
> + * @buf_size/count/start:	markers for chip->legacy.read_buf/write_buf
> + *				functions
>   * @max_cwperpage:		maximum QPIC codewords required. calculated
>   *				from all connected NAND devices pagesize
> + *
> + * @reg_read_pos:		marker for data read in reg_read_buf
> + *
> + * @cmd1/vld:			some fixed controller register values
>   */
>  struct qcom_nand_controller {
> -	struct nand_controller controller;
> -	struct list_head host_list;
> -
>  	struct device *dev;
>  
>  	void __iomem *base;
> -	phys_addr_t base_phys;
> -	dma_addr_t base_dma;
>  
>  	struct clk *core_clk;
>  	struct clk *aon_clk;
>  
> +	struct nandc_regs *regs;
> +	struct bam_transaction *bam_txn;
> +
> +	const struct qcom_nandc_props *props;
> +
> +	struct nand_controller controller;
> +	struct list_head host_list;
> +
>  	union {
>  		/* will be used only by QPIC for BAM DMA */
>  		struct {
> @@ -400,22 +413,22 @@ struct qcom_nand_controller {
>  	};
>  
>  	struct list_head desc_list;
> -	struct bam_transaction *bam_txn;
>  
>  	u8		*data_buffer;
> +	__le32		*reg_read_buf;
> +
> +	phys_addr_t base_phys;
> +	dma_addr_t base_dma;
> +	dma_addr_t reg_read_dma;
> +
>  	int		buf_size;
>  	int		buf_count;
>  	int		buf_start;
>  	unsigned int	max_cwperpage;
>  
> -	__le32 *reg_read_buf;
> -	dma_addr_t reg_read_dma;
>  	int reg_read_pos;
>  
> -	struct nandc_regs *regs;
> -
>  	u32 cmd1, vld;
> -	const struct qcom_nandc_props *props;
>  };
>  
>  /*
> @@ -431,19 +444,21 @@ struct qcom_nand_controller {
>   *				and reserved bytes
>   * @cw_data:			the number of bytes within a codeword protected
>   *				by ECC
> - * @use_ecc:			request the controller to use ECC for the
> - *				upcoming read/write
> - * @bch_enabled:		flag to tell whether BCH ECC mode is used
>   * @ecc_bytes_hw:		ECC bytes used by controller hardware for this
>   *				chip
> - * @status:			value to be returned if NAND_CMD_STATUS command
> - *				is executed
> + *
>   * @last_command:		keeps track of last command on this chip. used
>   *				for reading correct status
>   *
>   * @cfg0, cfg1, cfg0_raw..:	NANDc register configurations needed for
>   *				ecc/non-ecc mode for the current nand flash
>   *				device
> + *
> + * @status:			value to be returned if NAND_CMD_STATUS command
> + *				is executed
> + * @use_ecc:			request the controller to use ECC for the
> + *				upcoming read/write
> + * @bch_enabled:		flag to tell whether BCH ECC mode is used
>   */
>  struct qcom_nand_host {
>  	struct nand_chip chip;
> @@ -452,12 +467,10 @@ struct qcom_nand_host {
>  	int cs;
>  	int cw_size;
>  	int cw_data;
> -	bool use_ecc;
> -	bool bch_enabled;
>  	int ecc_bytes_hw;
>  	int spare_bytes;
>  	int bbm_size;
> -	u8 status;
> +
>  	int last_command;
>  
>  	u32 cfg0, cfg1;
> @@ -466,23 +479,27 @@ struct qcom_nand_host {
>  	u32 ecc_bch_cfg;
>  	u32 clrflashstatus;
>  	u32 clrreadstatus;
> +
> +	u8 status;
> +	bool use_ecc;
> +	bool bch_enabled;
>  };
>  
>  /*
>   * This data type corresponds to the NAND controller properties which varies
>   * among different NAND controllers.
>   * @ecc_modes - ecc mode for NAND
> + * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset
>   * @is_bam - whether NAND controller is using BAM
>   * @is_qpic - whether NAND CTRL is part of qpic IP
>   * @qpic_v2 - flag to indicate QPIC IP version 2
> - * @dev_cmd_reg_start - NAND_DEV_CMD_* registers starting offset
>   */
>  struct qcom_nandc_props {
>  	u32 ecc_modes;
> +	u32 dev_cmd_reg_start;
>  	bool is_bam;
>  	bool is_qpic;
>  	bool qpic_v2;
> -	u32 dev_cmd_reg_start;
>  };
>  
>  /* Frees the BAM transaction memory */
> -- 
> 2.36.1
> 

-- 
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