2011-01-17 22:36:47 +00:00
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <environment.h>
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#include <init.h>
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2011-11-27 12:00:29 +00:00
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#include <magicvar.h>
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2011-01-17 22:36:47 +00:00
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2011-09-22 17:02:57 +00:00
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#include <io.h>
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2011-01-17 22:36:47 +00:00
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#include <mach/imx-regs.h>
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#if defined(CONFIG_ARCH_IMX25) || defined(CONFIG_ARCH_IMX35)
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/*
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* Saves the boot source media into the $barebox_loc enviroment variable
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*
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* This information is useful for barebox init scripts as we can then easily
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* use a kernel image stored on the same media that we launch barebox with
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* (for example).
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*
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* imx25 and imx35 can boot into barebox from several media such as
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* nand, nor, mmc/sd cards, serial roms. "mmc" is used to represent several
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* sources as its impossible to distinguish between them.
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*
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* Some sources such as serial roms can themselves have 3 different boot
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* possibilities (i2c1, i2c2 etc). It is assumed that any board will
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* only be using one of these at any one time.
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*
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* Note also that I suspect that the boot source pins are only sampled at
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* power up.
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*/
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2011-08-15 08:57:27 +00:00
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static int imx_25_35_boot_save_loc(void)
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2011-01-17 22:36:47 +00:00
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{
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const char *bareboxloc = NULL;
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uint32_t reg;
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unsigned int ctrl, type;
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/* [CTRL][TYPE] */
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const char *const locations[4][4] = {
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{ /* CTRL = WEIM */
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"nor",
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NULL,
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"onenand",
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NULL,
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}, { /* CTRL == NAND */
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"nand",
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"nand",
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"nand",
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"nand",
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}, { /* CTRL == ATA, (imx35 only) */
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NULL,
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NULL, /* might be p-ata */
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NULL,
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NULL,
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}, { /* CTRL == expansion */
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"mmc", /* note imx25 could also be: movinand, ce-ata */
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NULL,
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"i2c",
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"spi",
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}
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};
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reg = readl(IMX_CCM_BASE + CCM_RCSR);
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ctrl = (reg >> CCM_RCSR_MEM_CTRL_SHIFT) & 0x3;
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type = (reg >> CCM_RCSR_MEM_TYPE_SHIFT) & 0x3;
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bareboxloc = locations[ctrl][type];
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if (bareboxloc) {
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setenv("barebox_loc", bareboxloc);
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export("barebox_loc");
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}
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return 0;
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}
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2011-08-15 08:57:27 +00:00
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coredevice_initcall(imx_25_35_boot_save_loc);
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2012-03-25 17:15:16 +00:00
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#endif
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#if defined(CONFIG_ARCH_IMX27)
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static int imx_27_boot_save_loc(void)
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{
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switch ((GPCR & GPCR_BOOT_MASK) >> GPCR_BOOT_SHIFT) {
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case GPCR_BOOT_UART_USB:
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setenv("barebox_loc", "serial");
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break;
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case GPCR_BOOT_8BIT_NAND_2k:
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case GPCR_BOOT_16BIT_NAND_2k:
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case GPCR_BOOT_16BIT_NAND_512:
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case GPCR_BOOT_8BIT_NAND_512:
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setenv("barebox_loc", "nand");
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break;
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default:
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setenv("barebox_loc", "nor");
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break;
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}
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2011-11-27 12:00:29 +00:00
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2012-03-25 17:15:16 +00:00
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export("barebox_loc");
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return 0;
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}
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coredevice_initcall(imx_27_boot_save_loc);
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2012-04-03 09:27:00 +00:00
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#endif
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2012-03-25 17:15:16 +00:00
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BAREBOX_MAGICVAR(barebox_loc, "The source barebox has been booted from");
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