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author | Marc Reilly <marc@cpdesign.com.au> | 2011-01-18 09:36:47 +1100 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2011-01-19 09:37:23 +0100 |
commit | c69f625a7199a35fdd108a1025532589b914149b (patch) | |
tree | 4971f57e6b4f1b7ca7e07c734206e0c89996b957 /arch/arm/mach-imx/boot.c | |
parent | 860887801360add59777ead18377af888d90b6d2 (diff) | |
download | barebox-c69f625a7199a35fdd108a1025532589b914149b.tar.gz barebox-c69f625a7199a35fdd108a1025532589b914149b.tar.xz |
imx(25,35): save boot location into $barebox_loc env.
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@cpdesign.com.au>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-imx/boot.c')
-rw-r--r-- | arch/arm/mach-imx/boot.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c new file mode 100644 index 0000000000..b4bf93bc35 --- /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 |