[PATCH v2 5/7] mtd: rawnand: brcmnand: Add read data bus interface

[William Zhang]

> -----Original Message-----
> From: Linus Walleij <linus.walleij at linaro.org>
> Sent: Monday, September 16, 2024 2:59 AM
> To: u-boot at lists.denx.de; Dario Binacchi
> <dario.binacchi at amarulasolutions.com>; Michael Trimarchi
> <michael at amarulasolutions.com>; Anand Gore
> <anand.gore at broadcom.com>; William Zhang
> <william.zhang at broadcom.com>; Kursad Oney
> <kursad.oney at broadcom.com>; Philippe Reynes
> <philippe.reynes at softathome.com>
> Cc: Linus Walleij <linus.walleij at linaro.org>
> Subject: [PATCH v2 5/7] mtd: rawnand: brcmnand: Add read data bus
> interface
>
> This is a port of the read data bus interface from the Linux
> brcmnand driver, commit
> 546e425991205f59281e160a0d0daed47b7ca9b3
> "mtd: rawnand: brcmnand: Add BCMBCA read data bus interface"
>
> This is needed for the BCMBCA RAW NAND driver.
>
> Signed-off-by: William Zhang <william.zhang at broadcom.com>
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
>  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 20 +++++++++++++++++-
> --
>  drivers/mtd/nand/raw/brcmnand/brcmnand.h |  2 ++
>  2 files changed, 19 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 552b239b95ae..2f786584a1ae 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -769,6 +769,20 @@ static inline void brcmnand_write_fc(struct
> brcmnand_controller *ctrl,
>  	__raw_writel(val, ctrl->nand_fc + word * 4);
>  }
>
> +static inline void brcmnand_read_data_bus(struct brcmnand_controller
> *ctrl,
> +					  void __iomem *flash_cache, u32
> *buffer, int fc_words)
> +{
> +	struct brcmnand_soc *soc = ctrl->soc;
> +	int i;
> +
> +	if (soc && soc->read_data_bus) {
> +		soc->read_data_bus(soc, flash_cache, buffer, fc_words);
> +	} else {
> +		for (i = 0; i < fc_words; i++)
> +			buffer[i] = brcmnand_read_fc(ctrl, i);
> +	}
> +}
> +
>  static void brcmnand_clear_ecc_addr(struct brcmnand_controller *ctrl)
>  {
>
> @@ -1812,7 +1826,7 @@ static int brcmnand_read_by_pio(struct
> mtd_info *mtd, struct nand_chip *chip,
>  {
>  	struct brcmnand_host *host = nand_get_controller_data(chip);
>  	struct brcmnand_controller *ctrl = host->ctrl;
> -	int i, j, ret = 0;
> +	int i, ret = 0;
>
>  	brcmnand_clear_ecc_addr(ctrl);
>
> @@ -1825,8 +1839,8 @@ static int brcmnand_read_by_pio(struct
> mtd_info *mtd, struct nand_chip *chip,
>  		if (likely(buf)) {
>  			brcmnand_soc_data_bus_prepare(ctrl->soc, false);
>
> -			for (j = 0; j < FC_WORDS; j++, buf++)
> -				*buf = brcmnand_read_fc(ctrl, j);
> +			brcmnand_read_data_bus(ctrl, ctrl->nand_fc, buf,
> FC_WORDS);
> +			buf += FC_WORDS;
>
>  			brcmnand_soc_data_bus_unprepare(ctrl->soc, false);
>  		}
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.h
> b/drivers/mtd/nand/raw/brcmnand/brcmnand.h
> index 6946a62b0679..3a1d60471361 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.h
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.h
> @@ -11,6 +11,8 @@ struct brcmnand_soc {
>  	void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en);
>  	void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare,
>  				 bool is_param);
> +	void (*read_data_bus)(struct brcmnand_soc *soc, void __iomem
> *flash_cache,
> +			      u32 *buffer, int fc_words);
>  	void *ctrl;
>  };
>
>
> --
> 2.46.0

Reviewed-by: William Zhang <william.zhang at broadcom.com>
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