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/*
* 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 <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_25_35_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;
}
coredevice_initcall(imx_25_35_boot_save_loc);
#endif
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