Re: [PATCH 7/7] crypto: caam: cleanup CONFIG_64BIT ifdefs when using io{read|write}64

Logan Gunthorpe
2017-06-23T17:59:22Z

Thanks Horia.

I'm inclined to just use your patch verbatim. I can set you as author,
but no matter how I do it, I'll need your Signed-off-by.

Logan

On 23/06/17 12:51 AM, Horia Geantă wrote:
> On 6/22/2017 7:49 PM, Logan Gunthorpe wrote:
>> Now that ioread64 and iowrite64 are always available we don't
>> need the ugly ifdefs to change their implementation when they
>> are not.
>>
> Thanks Logan.
>
> Note however this is not equivalent - it changes the behaviour, since
> CAAM engine on i.MX6S/SL/D/Q platforms is broken in terms of 64-bit
> register endianness - see CONFIG_CRYPTO_DEV_FSL_CAAM_IMX usage in code
> you are removing.
>
> [Yes, current code has its problems, as it does not differentiate b/w
> i.MX platforms with and without the (unofficial) erratum, but this
> should be fixed separately.]
>
> Below is the change that would keep current logic - still forcing i.MX
> to write CAAM 64-bit registers in BE even if the engine is LE (yes, diff
> is doing a poor job).
>
> Horia
>
> diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
> index 84d2f838a063..b893ebb24e65 100644
> --- a/drivers/crypto/caam/regs.h
> +++ b/drivers/crypto/caam/regs.h
> @@ -134,50 +134,25 @@ static inline void clrsetbits_32(void __iomem
> *reg, u32 clear, u32 set)
> * base + 0x0000 : least-significant 32 bits
> * base + 0x0004 : most-significant 32 bits
> */
> -#ifdef CONFIG_64BIT
> static inline void wr_reg64(void __iomem *reg, u64 data)
> {
> +#ifndef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
> if (caam_little_end)
> iowrite64(data, reg);
> else
> - iowrite64be(data, reg);
> -}
> -
> -static inline u64 rd_reg64(void __iomem *reg)
> -{
> - if (caam_little_end)
> - return ioread64(reg);
> - else
> - return ioread64be(reg);
> -}
> -
> -#else /* CONFIG_64BIT */
> -static inline void wr_reg64(void __iomem *reg, u64 data)
> -{
> -#ifndef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
> - if (caam_little_end) {
> - wr_reg32((u32 __iomem *)(reg) + 1, data >> 32);
> - wr_reg32((u32 __iomem *)(reg), data);
> - } else
> #endif
> - {
> - wr_reg32((u32 __iomem *)(reg), data >> 32);
> - wr_reg32((u32 __iomem *)(reg) + 1, data);
> - }
> + iowrite64be(data, reg);
> }
>
> static inline u64 rd_reg64(void __iomem *reg)
> {
> #ifndef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
> if (caam_little_end)
> - return ((u64)rd_reg32((u32 __iomem *)(reg) + 1) << 32 |
> - (u64)rd_reg32((u32 __iomem *)(reg)));
> + return ioread64(reg);
> else
> #endif
> - return ((u64)rd_reg32((u32 __iomem *)(reg)) << 32 |
> - (u64)rd_reg32((u32 __iomem *)(reg) + 1));
> + return ioread64be(reg);
> }
> -#endif /* CONFIG_64BIT */
>
> #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
> #ifdef CONFIG_SOC_IMX7D
>
>
>> Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
>> Cc: "Horia Geantă" <horia.geanta@nxp.com>
>> Cc: Dan Douglass <dan.douglass@nxp.com>
>> Cc: Herbert Xu <herbert@gondor.apana.org.au>
>> Cc: "David S. Miller" <davem@davemloft.net>
>> ---
>> drivers/crypto/caam/regs.h | 29 -----------------------------
>> 1 file changed, 29 deletions(-)
>>
>> diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h
>> index 84d2f838a063..26fc19dd0c39 100644
>> --- a/drivers/crypto/caam/regs.h
>> +++ b/drivers/crypto/caam/regs.h
>> @@ -134,7 +134,6 @@ static inline void clrsetbits_32(void __iomem *reg, u32 clear, u32 set)
>> * base + 0x0000 : least-significant 32 bits
>> * base + 0x0004 : most-significant 32 bits
>> */
>> -#ifdef CONFIG_64BIT
>> static inline void wr_reg64(void __iomem *reg, u64 data)
>> {
>> if (caam_little_end)
>> @@ -151,34 +150,6 @@ static inline u64 rd_reg64(void __iomem *reg)
>> return ioread64be(reg);
>> }
>>
>> -#else /* CONFIG_64BIT */
>> -static inline void wr_reg64(void __iomem *reg, u64 data)
>> -{
>> -#ifndef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
>> - if (caam_little_end) {
>> - wr_reg32((u32 __iomem *)(reg) + 1, data >> 32);
>> - wr_reg32((u32 __iomem *)(reg), data);
>> - } else
>> -#endif
>> - {
>> - wr_reg32((u32 __iomem *)(reg), data >> 32);
>> - wr_reg32((u32 __iomem *)(reg) + 1, data);
>> - }
>> -}
>> -
>> -static inline u64 rd_reg64(void __iomem *reg)
>> -{
>> -#ifndef CONFIG_CRYPTO_DEV_FSL_CAAM_IMX
>> - if (caam_little_end)
>> - return ((u64)rd_reg32((u32 __iomem *)(reg) + 1) << 32 |
>> - (u64)rd_reg32((u32 __iomem *)(reg)));
>> - else
>> -#endif
>> - return ((u64)rd_reg32((u32 __iomem *)(reg)) << 32 |
>> - (u64)rd_reg32((u32 __iomem *)(reg) + 1));
>> -}
>> -#endif /* CONFIG_64BIT */
>> -
>> #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
>> #ifdef CONFIG_SOC_IMX7D
>> #define cpu_to_caam_dma(value) \
>>