[U-Boot] [PATCH V2] mxc: ocotp fix hole in shadow registers

[Stefano Babic]

On 26/08/2015 09:40, Peng Fan wrote:
> There is a hole in shadow registers address map of size 0x100
> between bank 5 and bank 6 on iMX6QP, iMX6DQ, iMX6SDL, iMX6SX and iMX6UL.
> Bank 5 ends at 0x6F0 and Bank 6 starts at 0x800. When reading the fuses,
> we should account for this hole in address space.
> 
> Similar hole exists between bank 14 and bank 15 of size
> 0x80 on iMX6QP, iMX6DQ, iMX6SDL and iMX6SX.
> Note: iMX6SL has only 0-7 banks and there is no hole.
> Note: iMX6UL doesn't have this one.
> 
> When reading, we use register offset, so need to account for holes
> to get the correct address.
> When writing, we use bank/word index, there is no need to account
> for holes, always use bank/word index from fuse map.
> 
> Signed-off-by: Peng Fan <Peng.Fan at freescale.com>
> Cc: Stefano Babic <sbabic at denx.de>
> Cc: Fabio Estevam <fabio.estevam at freescale.com>
> ---
> 
> Changes v2:
>  Discard is_cpu_type(MXC_CPU_MX7D), since 7D cpu type is still not upstreamed.
> 
>  arch/arm/include/asm/arch-mx6/imx-regs.h |  3 +-
>  drivers/misc/mxc_ocotp.c                 | 78 ++++++++++++++++++++++++++++++--
>  2 files changed, 75 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
> index 4d84a9b..a685ed2 100644
> --- a/arch/arm/include/asm/arch-mx6/imx-regs.h
> +++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
> @@ -630,9 +630,10 @@ struct ocotp_regs {
>  	u32     version;
>  	u32     rsvd7[0xdb];
>  
> +	/* fuse banks */
>  	struct fuse_bank {
>  		u32	fuse_regs[0x20];
> -	} bank[16];
> +	} bank[0];
>  };
>  
>  struct fuse_bank0_regs {
> diff --git a/drivers/misc/mxc_ocotp.c b/drivers/misc/mxc_ocotp.c
> index d9b02c7..65ff815 100644
> --- a/drivers/misc/mxc_ocotp.c
> +++ b/drivers/misc/mxc_ocotp.c
> @@ -57,6 +57,68 @@
>  
>  #define WRITE_POSTAMBLE_US		2
>  
> +#if defined(CONFIG_MX6) || defined(CONFIG_VF610)
> +#define FUSE_BANK_SIZE	0x80
> +#ifdef CONFIG_MX6SL
> +#define FUSE_BANKS	8
> +#else
> +#define FUSE_BANKS	16
> +#endif
> +#elif defined CONFIG_MX7
> +#define FUSE_BANK_SIZE	0x40
> +#define FUSE_BANKS	16
> +#else
> +#error "Unsupported architecture\n"
> +#endif
> +
> +#if defined(CONFIG_MX6)
> +#include <asm/arch/sys_proto.h>
> +
> +/*
> + * There is a hole in shadow registers address map of size 0x100
> + * between bank 5 and bank 6 on iMX6QP, iMX6DQ, iMX6SDL, iMX6SX and iMX6UL.
> + * Bank 5 ends at 0x6F0 and Bank 6 starts at 0x800. When reading the fuses,
> + * we should account for this hole in address space.
> + *
> + * Similar hole exists between bank 14 and bank 15 of size
> + * 0x80 on iMX6QP, iMX6DQ, iMX6SDL and iMX6SX.
> + * Note: iMX6SL has only 0-7 banks and there is no hole.
> + * Note: iMX6UL doesn't have this one.
> + *
> + * This function is to covert user input to physical bank index.
> + * Only needed when read fuse, because we use register offset, so
> + * need to calculate real register offset.
> + * When write, no need to consider hole, always use the bank/word
> + * index from fuse map.
> + */
> +u32 fuse_bank_physical(int index)
> +{
> +	u32 phy_index;
> +
> +	if (is_cpu_type(MXC_CPU_MX6SL)) {
> +		phy_index = index;
> +	} else if (is_cpu_type(MXC_CPU_MX6UL)) {
> +		if (index >= 6)
> +			phy_index = fuse_bank_physical(5) + (index - 6) + 3;
> +		else
> +			phy_index = index;
> +	} else {
> +		if (index >= 15)
> +			phy_index = fuse_bank_physical(14) + (index - 15) + 2;
> +		else if (index >= 6)
> +			phy_index = fuse_bank_physical(5) + (index - 6) + 3;
> +		else
> +			phy_index = index;
> +	}
> +	return phy_index;
> +}
> +#else
> +u32 fuse_bank_physical(int index)
> +{
> +	return index;
> +}
> +#endif
> +
>  static void wait_busy(struct ocotp_regs *regs, unsigned int delay_us)
>  {
>  	while (readl(&regs->ctrl) & BM_CTRL_BUSY)
> @@ -73,9 +135,9 @@ static int prepare_access(struct ocotp_regs **regs, u32 bank, u32 word,
>  {
>  	*regs = (struct ocotp_regs *)OCOTP_BASE_ADDR;
>  
> -	if (bank >= ARRAY_SIZE((*regs)->bank) ||
> -			word >= ARRAY_SIZE((*regs)->bank[0].fuse_regs) >> 2 ||
> -			!assert) {
> +	if (bank >= FUSE_BANKS ||
> +	    word >= ARRAY_SIZE((*regs)->bank[0].fuse_regs) >> 2 ||
> +	    !assert) {
>  		printf("mxc_ocotp %s(): Invalid argument\n", caller);
>  		return -EINVAL;
>  	}
> @@ -113,12 +175,15 @@ int fuse_read(u32 bank, u32 word, u32 *val)
>  {
>  	struct ocotp_regs *regs;
>  	int ret;
> +	u32 phy_bank;
>  
>  	ret = prepare_read(&regs, bank, word, val, __func__);
>  	if (ret)
>  		return ret;
>  
> -	*val = readl(&regs->bank[bank].fuse_regs[word << 2]);
> +	phy_bank = fuse_bank_physical(bank);
> +
> +	*val = readl(&regs->bank[phy_bank].fuse_regs[word << 2]);
>  
>  	return finish_access(regspeng, __func__);
>  }
> @@ -259,12 +324,15 @@ int fuse_override(u32 bank, u32 word, u32 val)
>  {
>  	struct ocotp_regs *regs;
>  	int ret;
> +	u32 phy_bank;
>  
>  	ret = prepare_write(&regs, bank, word, __func__);
>  	if (ret)
>  		return ret;
>  
> -	writel(val, &regs->bank[bank].fuse_regs[word << 2]);
> +	phy_bank = fuse_bank_physical(bank);
> +
> +	writel(val, &regs->bank[phy_bank].fuse_regs[word << 2]);
>  
>  	return finish_access(regs, __func__);
>  }
> 
Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic


-- 
=====================================================================
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================