LXR uboot/arch/arm/include/asm/arch-rockchip/bootrom.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * (C) Copyright 2017 Heiko Stuebner <heiko@sntech.de>
   4 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
   5 */
   6
   7#ifndef _ASM_ARCH_BOOTROM_H
   8#define _ASM_ARCH_BOOTROM_H
   9
  10/*
  11 * Saved Stack pointer address.
  12 * Access might be needed in some special cases.
  13 */
  14extern u32 SAVE_SP_ADDR;
  15
  16/**
  17 * back_to_bootrom() - return to bootrom (for TPL/SPL), passing a
  18 *                     result code
  19 *
  20 * Transfer control back to the Rockchip BROM, restoring necessary
  21 * register context and passing a command/result code to the BROM
  22 * to instruct its next actions (e.g. continue boot sequence, enter
  23 * download mode, ...).
  24 *
  25 * This function does not return.
  26 *
  27 * @brom_cmd: indicates how the bootrom should continue the boot
  28 *            sequence (e.g. load the next stage)
  29 */
  30enum rockchip_bootrom_cmd {
  31        /*
  32         * These can not start at 0, as 0 has a special meaning
  33         * for setjmp().
  34         */
  35
  36        BROM_BOOT_NEXTSTAGE = 1,  /* continue boot-sequence */
  37        BROM_BOOT_ENTER_DNL,      /* have BROM enter download-mode */
  38};
  39
  40void back_to_bootrom(enum rockchip_bootrom_cmd brom_cmd);
  41
  42/**
  43 * Boot-device identifiers as used by the BROM
  44 */
  45enum {
  46        BROM_BOOTSOURCE_NAND = 1,
  47        BROM_BOOTSOURCE_EMMC = 2,
  48        BROM_BOOTSOURCE_SPINOR = 3,
  49        BROM_BOOTSOURCE_SPINAND = 4,
  50        BROM_BOOTSOURCE_SD = 5,
  51        BROM_BOOTSOURCE_USB = 10,
  52        BROM_LAST_BOOTSOURCE = BROM_BOOTSOURCE_USB
  53};
  54
  55extern const char * const boot_devices[BROM_LAST_BOOTSOURCE + 1];
  56
  57/**
  58 * Locations of the boot-device identifier in SRAM
  59 */
  60#define BROM_BOOTSOURCE_ID_ADDR   (CONFIG_IRAM_BASE + 0x10)
  61
  62#endif
  63