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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.
*
*/
#include <common.h>
#include <environment.h>
#include <init.h>
#include <magicvar.h>
#include <io.h>
#include <mach/generic.h>
static const char *bootsource_str[] = {
[bootsource_unknown] = "unknown",
[bootsource_nand] = "nand",
[bootsource_nor] = "nor",
[bootsource_mmc] = "mmc",
[bootsource_i2c] = "i2c",
[bootsource_spi] = "spi",
[bootsource_serial] = "serial",
[bootsource_onenand] = "onenand",
[bootsource_hd] = "harddisk",
};
static enum imx_bootsource bootsource;
void imx_set_bootsource(enum imx_bootsource src)
{
if (src >= ARRAY_SIZE(bootsource_str))
src = bootsource_unknown;
bootsource = src;
setenv("barebox_loc", bootsource_str[src]);
export("barebox_loc");
}
enum imx_bootsource imx_bootsource(void)
{
return bootsource;
}
BAREBOX_MAGICVAR(barebox_loc, "The source barebox has been booted from");
/* [CTRL][TYPE] */
static const enum imx_bootsource locations[4][4] = {
{ /* CTRL = WEIM */
bootsource_nor,
bootsource_unknown,
bootsource_onenand,
bootsource_unknown,
}, { /* CTRL == NAND */
bootsource_nand,
bootsource_nand,
bootsource_nand,
bootsource_nand,
}, { /* CTRL == ATA, (imx35 only) */
bootsource_unknown,
bootsource_unknown, /* might be p-ata */
bootsource_unknown,
bootsource_unknown,
}, { /* CTRL == expansion */
bootsource_mmc, /* note imx25 could also be: movinand, ce-ata */
bootsource_unknown,
bootsource_i2c,
bootsource_spi,
}
};
/*
* 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.
*/
int imx_25_35_boot_save_loc(unsigned int ctrl, unsigned int type)
{
const char *bareboxloc = NULL;
enum imx_bootsource src;
src = locations[ctrl][type];
imx_set_bootsource(src);
if (bareboxloc) {
setenv("barebox_loc", bareboxloc);
export("barebox_loc");
}
return 0;
}
#define IMX27_SYSCTRL_GPCR 0x18
#define IMX27_GPCR_BOOT_SHIFT 16
#define IMX27_GPCR_BOOT_MASK (0xf << IMX27_GPCR_BOOT_SHIFT)
#define IMX27_GPCR_BOOT_UART_USB 0
#define IMX27_GPCR_BOOT_8BIT_NAND_2k 2
#define IMX27_GPCR_BOOT_16BIT_NAND_2k 3
#define IMX27_GPCR_BOOT_16BIT_NAND_512 4
#define IMX27_GPCR_BOOT_16BIT_CS0 5
#define IMX27_GPCR_BOOT_32BIT_CS0 6
#define IMX27_GPCR_BOOT_8BIT_NAND_512 7
void imx_27_boot_save_loc(void __iomem *sysctrl_base)
{
enum imx_bootsource src;
uint32_t val;
val = readl(sysctrl_base + IMX27_SYSCTRL_GPCR);
val &= IMX27_GPCR_BOOT_MASK;
val >>= IMX27_GPCR_BOOT_SHIFT;
switch (val) {
case IMX27_GPCR_BOOT_UART_USB:
src = bootsource_serial;
break;
case IMX27_GPCR_BOOT_8BIT_NAND_2k:
case IMX27_GPCR_BOOT_16BIT_NAND_2k:
case IMX27_GPCR_BOOT_16BIT_NAND_512:
case IMX27_GPCR_BOOT_8BIT_NAND_512:
src = bootsource_nand;
break;
default:
src = bootsource_nor;
break;
}
imx_set_bootsource(src);
}
#define IMX51_SRC_SBMR 0x4
#define IMX51_SBMR_BT_MEM_TYPE_SHIFT 7
#define IMX51_SBMR_BT_MEM_CTL_SHIFT 0
#define IMX51_SBMR_BMOD_SHIFT 14
int imx51_boot_save_loc(void __iomem *src_base)
{
enum imx_bootsource src = bootsource_unknown;
uint32_t reg;
unsigned int ctrl, type;
reg = readl(src_base + IMX51_SRC_SBMR);
switch ((reg >> IMX51_SBMR_BMOD_SHIFT) & 0x3) {
case 0:
case 2:
/* internal boot */
ctrl = (reg >> IMX51_SBMR_BT_MEM_CTL_SHIFT) & 0x3;
type = (reg >> IMX51_SBMR_BT_MEM_TYPE_SHIFT) & 0x3;
src = locations[ctrl][type];
break;
case 1:
/* reserved */
src = bootsource_unknown;
break;
case 3:
src = bootsource_serial;
break;
}
imx_set_bootsource(src);
return 0;
}
#define IMX53_SRC_SBMR 0x4
int imx53_boot_save_loc(void __iomem *src_base)
{
enum imx_bootsource src = bootsource_unknown;
uint32_t cfg1 = readl(src_base + IMX53_SRC_SBMR) & 0xff;
switch (cfg1 >> 4) {
case 2:
src = bootsource_hd;
break;
case 3:
if (cfg1 & (1 << 3))
src = bootsource_spi;
else
src = bootsource_i2c;
break;
case 4:
case 5:
case 6:
case 7:
src = bootsource_mmc;
break;
default:
break;
}
if (cfg1 & (1 << 7))
src = bootsource_nand;
imx_set_bootsource(src);
return 0;
}
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