[PATCH v2] imx(25,35): save boot location into $barebox_loc env.

[Sascha Hauer]

Hi Marc,

On Tue, Jan 18, 2011 at 09:36:47AM +1100, Marc Reilly wrote:
> Saves the boot source into an environment variable so env scripts
> can more easily use boot source information.
> 
> Note only tested on imx35. I haven't added support for any other variants
> because I'm not familiar with them. (And can't test them anyway).
> 
> Signed-off-by: Marc Reilly <marc at cpdesign.com.au>

-next currently breaks with

  CC      arch/arm/mach-imx/boot.o
arch/arm/mach-imx/boot.c: In function 'imx_boot_save_loc':
arch/arm/mach-imx/boot.c:77: error: 'CCM_RCSR_MEM_TYPE_SHIFT' undeclared (first use in this function)
arch/arm/mach-imx/boot.c:77: error: (Each undeclared identifier is reported only once
arch/arm/mach-imx/boot.c:77: error: for each function it appears in.)
make[1]: *** [arch/arm/mach-imx/boot.o] Error 1
make: *** [arch/arm/mach-imx] Error 2
make: *** Waiting for unfinished jobs....
  AS      arch/arm/lib/ashrdi3.o

Can you prepare a patch for this please?

Sascha

> ---
>  arch/arm/mach-imx/Makefile |    1 +
>  arch/arm/mach-imx/boot.c   |   95 ++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 96 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-imx/boot.c
> 
> diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
> index d000683..3b2deaf 100644
> --- a/arch/arm/mach-imx/Makefile
> +++ b/arch/arm/mach-imx/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_IMX_IIM)	+= iim.o
>  obj-$(CONFIG_NAND_IMX) += nand.o
>  obj-y += speed.o
>  obj-y += devices.o
> +obj-y += boot.o
> diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c
> new file mode 100644
> index 0000000..b4bf93b
> --- /dev/null
> +++ b/arch/arm/mach-imx/boot.c
> @@ -0,0 +1,95 @@
> +/*
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + */
> +
> +#include <common.h>
> +#include <environment.h>
> +#include <init.h>
> +
> +#include <asm/io.h>
> +#include <mach/imx-regs.h>
> +
> +#if defined(CONFIG_ARCH_IMX25) || defined(CONFIG_ARCH_IMX35)
> +/*
> + * Saves the boot source media into the $barebox_loc enviroment variable
> + *
> + * This information is useful for barebox init scripts as we can then easily
> + * use a kernel image stored on the same media that we launch barebox with
> + * (for example).
> + *
> + * imx25 and imx35 can boot into barebox from several media such as
> + * nand, nor, mmc/sd cards, serial roms. "mmc" is used to represent several
> + * sources as its impossible to distinguish between them.
> + *
> + * Some sources such as serial roms can themselves have 3 different boot
> + * possibilities (i2c1, i2c2 etc). It is assumed that any board will
> + * only be using one of these at any one time.
> + *
> + * Note also that I suspect that the boot source pins are only sampled at
> + * power up.
> + */
> +static int imx_boot_save_loc(void)
> +{
> +	const char *bareboxloc = NULL;
> +	uint32_t reg;
> +	unsigned int ctrl, type;
> +
> +	/* [CTRL][TYPE] */
> +	const char *const locations[4][4] = {
> +		{ /* CTRL = WEIM */
> +			"nor",
> +			NULL,
> +			"onenand",
> +			NULL,
> +		}, { /* CTRL == NAND */
> +			"nand",
> +			"nand",
> +			"nand",
> +			"nand",
> +		}, { /* CTRL == ATA, (imx35 only) */
> +			NULL,
> +			NULL, /* might be p-ata */
> +			NULL,
> +			NULL,
> +		}, { /* CTRL == expansion */
> +			"mmc", /* note imx25 could also be: movinand, ce-ata */
> +			NULL,
> +			"i2c",
> +			"spi",
> +		}
> +	};
> +
> +	reg = readl(IMX_CCM_BASE + CCM_RCSR);
> +	ctrl = (reg >> CCM_RCSR_MEM_CTRL_SHIFT) & 0x3;
> +	type = (reg >> CCM_RCSR_MEM_TYPE_SHIFT) & 0x3;
> +
> +	bareboxloc = locations[ctrl][type];
> +
> +	if (bareboxloc) {
> +		setenv("barebox_loc", bareboxloc);
> +		export("barebox_loc");
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * This can only be called after env_push_context() has been called
> + * so it is a late_initcall.
> + */
> +late_initcall(imx_boot_save_loc);
> +
> +#endif
> -- 
> 1.7.1
> 
> 
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