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Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform

From Arnd Bergmann <arnd@arndb.de>
Newsgroups linux.kernel
Subject Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform
Date 2016-02-03 14:50 +0100
Message-ID <qY5YK-2CV-9@gated-at.bofh.it> (permalink)
References <qXNSa-72M-15@gated-at.bofh.it> <qXQ3E-93-1@gated-at.bofh.it> <qY5Fq-2vi-63@gated-at.bofh.it>
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On Wednesday 03 February 2016 13:24:10 Zubair Lutfullah Kakakhel wrote:
> 
> Bitfields for both endians are used and handled by mips.
> Mainly used by cavium.
> 
> As this is a cavium driver, would it be acceptable?
> 
> Or should I replace with the following.
> 
>         v = cvmx_read_csr((uint64_t)base + CVMX_SATA_UCTL_SHIM_CFG);
>         v &= ~(SATA_UCTL_ENDIAN_MODE_E_MASK << DMA_ENDIAN_MODE);
>         v &= ~(SATA_UCTL_ENDIAN_MODE_E_MASK << CSR_ENDIAN_MODE);
> #ifdef __BIG_ENDIAN
>         v |= SATA_UCTL_ENDIAN_MODE_E_BIG << DMA_ENDIAN_MODE;
>         v |= SATA_UCTL_ENDIAN_MODE_E_BIG << CSR_ENDIAN_MODE;
> #else
>         v |= SATA_UCTL_ENDIAN_MODE_E_LITTLE << DMA_ENDIAN_MODE;
>         v |= SATA_UCTL_ENDIAN_MODE_E_LITTLE << CSR_ENDIAN_MODE;
> #endif
>         v |= 1 << DMA_READ_CMD;
>         cvmx_write_csr((uint64_t)base + CVMX_SATA_UCTL_SHIM_CFG, v);

I think something like this would be more conventional, yes. Or maybe
define the macros so you don't have to do the shift everywhere:

         v &= ~SATA_UCTL_ENDIAN_MODE_E_MASK | SATA_UCTL_ENDIAN_MODE | SATA_UCTL_DMA_READ_CMD;

	Arnd

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[PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> - 2016-02-02 19:30 +0100
  Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform David Daney <ddaney@caviumnetworks.com> - 2016-02-02 19:40 +0100
  Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Arnd Bergmann <arnd@arndb.de> - 2016-02-02 21:50 +0100
    Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> - 2016-02-03 14:30 +0100
      Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Arnd Bergmann <arnd@arndb.de> - 2016-02-03 14:50 +0100
        Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> - 2016-02-03 15:50 +0100
          Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Arnd Bergmann <arnd@arndb.de> - 2016-02-03 16:40 +0100
            Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> - 2016-02-03 17:10 +0100
              Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Arnd Bergmann <arnd@arndb.de> - 2016-02-03 17:30 +0100
      Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Arnd Bergmann <arnd@arndb.de> - 2016-02-03 14:50 +0100
        Re: [PATCH v6] SATA: OCTEON: support SATA on OCTEON platform Zubair Lutfullah Kakakhel <Zubair.Kakakhel@imgtec.com> - 2016-02-03 15:50 +0100

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