Commit 70656c79 authored by Vivek Gautam's avatar Vivek Gautam Committed by Minkyu Kang

Exynos5: Add support for USB download boot mode

Exynos5250 supports secondary USB device boot mode. If the iROM fails
to download u-boot from the primary boot device (such as SD or eMMC),
it will try to retrieve from the secondary boot device (such as USB).
Signed-off-by: default avatarNaveen Krishna Ch <ch.naveen@samsung.com>
Signed-off-by: default avatarSimon Glass <sjg@chromium.org>
Signed-off-by: default avatarVivek Gautam <gautam.vivek@samsung.com>
Acked-by: default avatarSimon Glass <sjg@chromium.org>
Signed-off-by: default avatarMinkyu Kang <mk7.kang@samsung.com>
parent 60179546
......@@ -32,6 +32,21 @@ enum boot_mode {
};
typedef u32 (*spi_copy_func_t)(u32 offset, u32 nblock, u32 dst);
typedef u32 (*usb_copy_func_t)(void);
/*
* Set/clear program flow prediction and return the previous state.
*/
static int config_branch_prediction(int set_cr_z)
{
unsigned int cr;
/* System Control Register: 11th bit Z Branch prediction enable */
cr = get_cr();
set_cr(set_cr_z ? cr | CR_Z : cr & ~CR_Z);
return cr & CR_Z;
}
/*
* Copy U-boot from mmc to RAM:
......@@ -41,10 +56,20 @@ enum boot_mode {
void copy_uboot_to_ram(void)
{
spi_copy_func_t spi_copy;
enum boot_mode bootmode;
usb_copy_func_t usb_copy;
int is_cr_z_set;
unsigned int sec_boot_check;
enum boot_mode bootmode = BOOT_MODE_OM;
u32 (*copy_bl2)(u32, u32, u32);
bootmode = readl(EXYNOS5_POWER_BASE) & OM_STAT;
/* Read iRAM location to check for secondary USB boot mode */
sec_boot_check = readl(EXYNOS_IRAM_SECONDARY_BASE);
if (sec_boot_check == EXYNOS_USB_SECONDARY_BOOT)
bootmode = BOOT_MODE_USB;
if (bootmode == BOOT_MODE_OM)
bootmode = readl(EXYNOS5_POWER_BASE) & OM_STAT;
switch (bootmode) {
case BOOT_MODE_SERIAL:
......@@ -57,6 +82,17 @@ void copy_uboot_to_ram(void)
copy_bl2(BL2_START_OFFSET, BL2_SIZE_BLOC_COUNT,
CONFIG_SYS_TEXT_BASE);
break;
case BOOT_MODE_USB:
/*
* iROM needs program flow prediction to be disabled
* before copy from USB device to RAM
*/
is_cr_z_set = config_branch_prediction(0);
usb_copy = *(usb_copy_func_t *)
EXYNOS_COPY_USB_FNPTR_ADDR;
usb_copy();
config_branch_prediction(is_cr_z_set);
break;
default:
break;
}
......
......@@ -134,6 +134,11 @@
#define CONFIG_USB_EHCI_EXYNOS
#define CONFIG_USB_STORAGE
/* USB boot mode */
#define EXYNOS_COPY_USB_FNPTR_ADDR 0x02020070
#define EXYNOS_USB_SECONDARY_BOOT 0xfeed0002
#define EXYNOS_IRAM_SECONDARY_BASE 0x02020018
/* MMC SPL */
#define CONFIG_SPL
#define COPY_BL2_FNPTR_ADDR 0x02020030
......
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