[PATCH v2 01/10] mtd: rawnand: brcmnand: Refactored code to introduce helper functions

William Zhang william.zhang at broadcom.com
Wed Feb 22 02:09:01 CET 2023



On 02/11/2023 07:29 AM, Linus Walleij wrote:
> From: Kamal Dasu <kdasu.kdev at gmail.com>
> 
> Refactored NAND ECC and CMD address configuration code to use helper
> functions.
> 
> Signed-off-by: Kamal Dasu <kdasu.kdev at gmail.com>
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> [Ported to U-Boot from the Linux kernel]
> Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
> ---
>   drivers/mtd/nand/raw/brcmnand/brcmnand.c | 100 ++++++++++++++---------
>   1 file changed, 62 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index 74c9348f7fc4..571f1c795da0 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -595,6 +595,54 @@ static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl,
>   	__raw_writel(val, ctrl->nand_fc + word * 4);
>   }
>   
> +static void brcmnand_clear_ecc_addr(struct brcmnand_controller *ctrl)
> +{
> +
> +	/* Clear error addresses */
> +	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
> +	brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
> +	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
> +	brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);
> +}
> +
> +static u64 brcmnand_get_uncorrecc_addr(struct brcmnand_controller *ctrl)
> +{
> +	u64 err_addr;
> +
> +	err_addr = brcmnand_read_reg(ctrl, BRCMNAND_UNCORR_ADDR);
> +	err_addr |= ((u64)(brcmnand_read_reg(ctrl,
> +					     BRCMNAND_UNCORR_EXT_ADDR)
> +					     & 0xffff) << 32);
> +
> +	return err_addr;
> +}
> +
> +static u64 brcmnand_get_correcc_addr(struct brcmnand_controller *ctrl)
> +{
> +	u64 err_addr;
> +
> +	err_addr = brcmnand_read_reg(ctrl, BRCMNAND_CORR_ADDR);
> +	err_addr |= ((u64)(brcmnand_read_reg(ctrl,
> +					     BRCMNAND_CORR_EXT_ADDR)
> +					     & 0xffff) << 32);
> +
> +	return err_addr;
> +}
> +
> +static void brcmnand_set_cmd_addr(struct mtd_info *mtd, u64 addr)
> +{
> +	struct nand_chip *chip =  mtd_to_nand(mtd);
> +	struct brcmnand_host *host = nand_get_controller_data(chip);
> +	struct brcmnand_controller *ctrl = host->ctrl;
> +
> +	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> +			   (host->cs << 16) | ((addr >> 32) & 0xffff));
> +	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> +	brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> +			   lower_32_bits(addr));
> +	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +}
> +
>   static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs,
>   				     enum brcmnand_cs_reg reg)
>   {
> @@ -1190,9 +1238,12 @@ static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
>   {
>   	struct brcmnand_controller *ctrl = host->ctrl;
>   	int ret;
> +	u64 cmd_addr;
> +
> +	cmd_addr = brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +
> +	dev_dbg(ctrl->dev, "send native cmd %d addr 0x%llx\n", cmd, cmd_addr);
>   
> -	dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd,
> -		brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS));
>   	BUG_ON(ctrl->cmd_pending != 0);
>   	ctrl->cmd_pending = cmd;
>   
> @@ -1365,12 +1416,7 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
>   	if (!native_cmd)
>   		return;
>   
> -	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> -		(host->cs << 16) | ((addr >> 32) & 0xffff));
> -	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> -	brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr));
> -	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> -
> +	brcmnand_set_cmd_addr(mtd, addr);
>   	brcmnand_send_cmd(host, native_cmd);
>   	brcmnand_waitfunc(mtd, chip);
>   
> @@ -1600,20 +1646,10 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
>   	struct brcmnand_controller *ctrl = host->ctrl;
>   	int i, j, ret = 0;
>   
> -	/* Clear error addresses */
> -	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
> -	brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
> -	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
> -	brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);
> -
> -	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> -			(host->cs << 16) | ((addr >> 32) & 0xffff));
> -	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> +	brcmnand_clear_ecc_addr(ctrl);
>   
>   	for (i = 0; i < trans; i++, addr += FC_BYTES) {
> -		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> -				   lower_32_bits(addr));
> -		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +		brcmnand_set_cmd_addr(mtd, addr);
>   		/* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */
>   		brcmnand_send_cmd(host, CMD_PAGE_READ);
>   		brcmnand_waitfunc(mtd, chip);
> @@ -1633,21 +1669,15 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
>   					host->hwcfg.sector_size_1k);
>   
>   		if (ret != -EBADMSG) {
> -			*err_addr = brcmnand_read_reg(ctrl,
> -					BRCMNAND_UNCORR_ADDR) |
> -				((u64)(brcmnand_read_reg(ctrl,
> -						BRCMNAND_UNCORR_EXT_ADDR)
> -					& 0xffff) << 32);
> +			*err_addr = brcmnand_get_uncorrecc_addr(ctrl);
> +
>   			if (*err_addr)
>   				ret = -EBADMSG;
>   		}
>   
>   		if (!ret) {
> -			*err_addr = brcmnand_read_reg(ctrl,
> -					BRCMNAND_CORR_ADDR) |
> -				((u64)(brcmnand_read_reg(ctrl,
> -						BRCMNAND_CORR_EXT_ADDR)
> -					& 0xffff) << 32);
> +			*err_addr = brcmnand_get_correcc_addr(ctrl);
> +
>   			if (*err_addr)
>   				ret = -EUCLEAN;
>   		}
> @@ -1721,7 +1751,7 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
>   	dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);
>   
>   try_dmaread:
> -	brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0);
> +	brcmnand_clear_ecc_addr(ctrl);
>   
>   #ifndef __UBOOT__
>   	if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
> @@ -1875,15 +1905,9 @@ static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
>   	}
>   #endif /* __UBOOT__ */
>   
> -	brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> -			(host->cs << 16) | ((addr >> 32) & 0xffff));
> -	(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> -
>   	for (i = 0; i < trans; i++, addr += FC_BYTES) {
>   		/* full address MUST be set before populating FC */
> -		brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> -				   lower_32_bits(addr));
> -		(void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +		brcmnand_set_cmd_addr(mtd, addr);
>   
>   		if (buf) {
>   			brcmnand_soc_data_bus_prepare(ctrl->soc, false);
> 

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