linux-kernel - Re: [PATCH 1/2] MIPS: OCTEON: Add register definitions for SPI host hardware.

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Date:	Sat, 19 May 2012 23:23:23 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	David Daney <ddaney.cavm@...il.com>,
	devicetree-discuss@...ts.ozlabs.org,
	Rob Herring <rob.herring@...xeda.com>,
	spi-devel-general@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, linux-mips@...ux-mips.org,
	linux-doc@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 1/2] MIPS: OCTEON: Add register definitions for SPI host hardware.

On Fri, 11 May 2012 14:34:45 -0700, David Daney <ddaney.cavm@...il.com> wrote:
> From: David Daney <david.daney@...ium.com>
> 
> Needed by SPI driver.
> 
> Signed-off-by: David Daney <david.daney@...ium.com>
> ---
>  arch/mips/include/asm/octeon/cvmx-mpi-defs.h |  328 ++++++++++++++++++++++++++
>  1 files changed, 328 insertions(+), 0 deletions(-)
>  create mode 100644 arch/mips/include/asm/octeon/cvmx-mpi-defs.h
> 
> diff --git a/arch/mips/include/asm/octeon/cvmx-mpi-defs.h b/arch/mips/include/asm/octeon/cvmx-mpi-defs.h
> new file mode 100644
> index 0000000..4615b10
> --- /dev/null
> +++ b/arch/mips/include/asm/octeon/cvmx-mpi-defs.h
> @@ -0,0 +1,328 @@
> +/***********************license start***************
> + * Author: Cavium Networks
> + *
> + * Contact: support@...iumnetworks.com
> + * This file is part of the OCTEON SDK
> + *
> + * Copyright (c) 2003-2012 Cavium Networks
> + *
> + * This file is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License, Version 2, as
> + * published by the Free Software Foundation.
> + *
> + * This file is distributed in the hope that it will be useful, but
> + * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
> + * NONINFRINGEMENT.  See the GNU General Public License for more
> + * details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this file; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
> + * or visit http://www.gnu.org/licenses/.
> + *
> + * This file may also be available under a different license from Cavium.
> + * Contact Cavium Networks for more information
> + ***********************license end**************************************/
> +
> +#ifndef __CVMX_MPI_DEFS_H__
> +#define __CVMX_MPI_DEFS_H__
> +
> +#define CVMX_MPI_CFG (CVMX_ADD_IO_SEG(0x0001070000001000ull))
> +#define CVMX_MPI_DATX(offset) (CVMX_ADD_IO_SEG(0x0001070000001080ull) + ((offset) & 15) * 8)
> +#define CVMX_MPI_STS (CVMX_ADD_IO_SEG(0x0001070000001008ull))
> +#define CVMX_MPI_TX (CVMX_ADD_IO_SEG(0x0001070000001010ull))
> +
> +union cvmx_mpi_cfg {
> +	uint64_t u64;
> +	struct cvmx_mpi_cfg_s {
> +#ifdef __BIG_ENDIAN_BITFIELD
> +		uint64_t reserved_29_63:35;
> +		uint64_t clkdiv:13;
> +		uint64_t csena3:1;
> +		uint64_t csena2:1;
> +		uint64_t csena1:1;
> +		uint64_t csena0:1;
> +		uint64_t cslate:1;
> +		uint64_t tritx:1;
> +		uint64_t idleclks:2;
> +		uint64_t cshi:1;
> +		uint64_t csena:1;
> +		uint64_t int_ena:1;
> +		uint64_t lsbfirst:1;
> +		uint64_t wireor:1;
> +		uint64_t clk_cont:1;
> +		uint64_t idlelo:1;
> +		uint64_t enable:1;
> +#else
> +		uint64_t enable:1;
> +		uint64_t idlelo:1;
> +		uint64_t clk_cont:1;
> +		uint64_t wireor:1;
> +		uint64_t lsbfirst:1;
> +		uint64_t int_ena:1;
> +		uint64_t csena:1;
> +		uint64_t cshi:1;
> +		uint64_t idleclks:2;
> +		uint64_t tritx:1;
> +		uint64_t cslate:1;
> +		uint64_t csena0:1;
> +		uint64_t csena1:1;
> +		uint64_t csena2:1;
> +		uint64_t csena3:1;
> +		uint64_t clkdiv:13;
> +		uint64_t reserved_29_63:35;
> +#endif
> +	} s;

:-/  I'm not a fan of bitfields for register access. I'd much rather
have macros the various bit positions; but given that this live under
arch/mips I can't really say much and you can add my acked-by if you
need to.

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