diff options
Diffstat (limited to 'arch/arm/cpu/armv7/exynos/spl_boot.c')
| -rw-r--r-- | arch/arm/cpu/armv7/exynos/spl_boot.c | 203 |
1 files changed, 203 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/exynos/spl_boot.c b/arch/arm/cpu/armv7/exynos/spl_boot.c new file mode 100644 index 000000000..6e8dd3b5d --- /dev/null +++ b/arch/arm/cpu/armv7/exynos/spl_boot.c @@ -0,0 +1,203 @@ +/* + * Copyright (C) 2012 Samsung Electronics + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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<config.h> + +#include <asm/arch/clock.h> +#include <asm/arch/clk.h> +#include <asm/arch/dmc.h> +#include <asm/arch/power.h> +#include <asm/arch/spl.h> + +#include "common_setup.h" +#include "clock_init.h" + +DECLARE_GLOBAL_DATA_PTR; +#define OM_STAT (0x1f << 1) + +/* Index into irom ptr table */ +enum index { + MMC_INDEX, + EMMC44_INDEX, + EMMC44_END_INDEX, + SPI_INDEX, + USB_INDEX, +}; + +/* IROM Function Pointers Table */ +u32 irom_ptr_table[] = { + [MMC_INDEX] = 0x02020030, /* iROM Function Pointer-SDMMC boot */ + [EMMC44_INDEX] = 0x02020044, /* iROM Function Pointer-EMMC4.4 boot*/ + [EMMC44_END_INDEX] = 0x02020048,/* iROM Function Pointer + -EMMC4.4 end boot operation */ + [SPI_INDEX] = 0x02020058, /* iROM Function Pointer-SPI boot */ + [USB_INDEX] = 0x02020070, /* iROM Function Pointer-USB boot*/ + }; + +void *get_irom_func(int index) +{ + return (void *)*(u32 *)irom_ptr_table[index]; +} + +#ifdef CONFIG_USB_BOOTING +/* + * 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; +} +#endif + +/* +* Copy U-boot from mmc to RAM: +* COPY_BL2_FNPTR_ADDR: Address in iRAM, which Contains +* Pointer to API (Data transfer from mmc to ram) +*/ +void copy_uboot_to_ram(void) +{ + enum boot_mode bootmode = BOOT_MODE_OM; + + u32 (*copy_bl2)(u32 offset, u32 nblock, u32 dst) = NULL; + u32 offset = 0, size = 0; +#ifdef CONFIG_SUPPORT_EMMC_BOOT + u32 (*copy_bl2_from_emmc)(u32 nblock, u32 dst); + void (*end_bootop_from_emmc)(void); +#endif +#ifdef CONFIG_USB_BOOTING + u32 (*usb_copy)(void); + int is_cr_z_set; + unsigned int sec_boot_check; + + /* 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; +#endif + + if (bootmode == BOOT_MODE_OM) + bootmode = readl(samsung_get_base_power()) & OM_STAT; + + switch (bootmode) { +#ifdef CONFIG_SPI_BOOTING + case BOOT_MODE_SERIAL: + offset = SPI_FLASH_UBOOT_POS; + size = CONFIG_BL2_SIZE; + copy_bl2 = get_irom_func(SPI_INDEX); + break; +#endif + case BOOT_MODE_MMC: + offset = BL2_START_OFFSET; + size = BL2_SIZE_BLOC_COUNT; + copy_bl2 = get_irom_func(MMC_INDEX); + break; +#ifdef CONFIG_SUPPORT_EMMC_BOOT + case BOOT_MODE_EMMC: + /* Set the FSYS1 clock divisor value for EMMC boot */ + emmc_boot_clk_div_set(); + + copy_bl2_from_emmc = get_irom_func(EMMC44_INDEX); + end_bootop_from_emmc = get_irom_func(EMMC44_END_INDEX); + + copy_bl2_from_emmc(BL2_SIZE_BLOC_COUNT, CONFIG_SYS_TEXT_BASE); + end_bootop_from_emmc(); + break; +#endif +#ifdef CONFIG_USB_BOOTING + 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 = get_irom_func(USB_INDEX); + usb_copy(); + config_branch_prediction(is_cr_z_set); + break; +#endif + default: + break; + } + + if (copy_bl2) + copy_bl2(offset, size, CONFIG_SYS_TEXT_BASE); +} + +void memzero(void *s, size_t n) +{ + char *ptr = s; + size_t i; + + for (i = 0; i < n; i++) + *ptr++ = '\0'; +} + +/** + * Set up the U-Boot global_data pointer + * + * This sets the address of the global data, and sets up basic values. + * + * @param gdp Value to give to gd + */ +static void setup_global_data(gd_t *gdp) +{ + gd = gdp; + memzero((void *)gd, sizeof(gd_t)); + gd->flags |= GD_FLG_RELOC; + gd->baudrate = CONFIG_BAUDRATE; + gd->have_console = 1; +} + +void board_init_f(unsigned long bootflag) +{ + __aligned(8) gd_t local_gd; + __attribute__((noreturn)) void (*uboot)(void); + + setup_global_data(&local_gd); + + if (do_lowlevel_init()) + power_exit_wakeup(); + + copy_uboot_to_ram(); + + /* Jump to U-Boot image */ + uboot = (void *)CONFIG_SYS_TEXT_BASE; + (*uboot)(); + /* Never returns Here */ +} + +/* Place Holders */ +void board_init_r(gd_t *id, ulong dest_addr) +{ + /* Function attribute is no-return */ + /* This Function never executes */ + while (1) + ; +} +void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3) {} |