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

   1 /*
   2  * (C) Copyright 2017 Heiko Stuebner <heiko@sntech.de>
   3  * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0
   6  */
   7
   8 #ifndef _ASM_ARCH_BOOTROM_H
   9 #define _ASM_ARCH_BOOTROM_H
  10
  11 /*
  12  * Saved Stack pointer address.
  13  * Access might be needed in some special cases.
  14  */
  15 extern u32 SAVE_SP_ADDR;
  16
  17 /**
  18  * back_to_bootrom() - return to bootrom (for TPL/SPL), passing a
  19  *                     result code
  20  *
  21  * Transfer control back to the Rockchip BROM, restoring necessary
  22  * register context and passing a command/result code to the BROM
  23  * to instruct its next actions (e.g. continue boot sequence, enter
  24  * download mode, ...).
  25  *
  26  * This function does not return.
  27  *
  28  * @brom_cmd: indicates how the bootrom should continue the boot
  29  *            sequence (e.g. load the next stage)
  30  */
  31 enum rockchip_bootrom_cmd {
  32         /*
  33          * These can not start at 0, as 0 has a special meaning
  34          * for setjmp().
  35          */
  36
  37         BROM_BOOT_NEXTSTAGE = 1,  /* continue boot-sequence */
  38         BROM_BOOT_ENTER_DNL,      /* have BROM enter download-mode */
  39 };
  40
  41 void back_to_bootrom(enum rockchip_bootrom_cmd brom_cmd);
  42
  43 /**
  44  * Boot-device identifiers as used by the BROM
  45  */
  46 enum {
  47         BROM_BOOTSOURCE_NAND = 1,
  48         BROM_BOOTSOURCE_EMMC = 2,
  49         BROM_BOOTSOURCE_SPINOR = 3,
  50         BROM_BOOTSOURCE_SPINAND = 4,
  51         BROM_BOOTSOURCE_SD = 5,
  52         BROM_BOOTSOURCE_USB = 10,
  53         BROM_LAST_BOOTSOURCE = BROM_BOOTSOURCE_USB
  54 };
  55
  56 /**
  57  * Locations of the boot-device identifier in SRAM
  58  */
  59 #define RK3399_BROM_BOOTSOURCE_ID_ADDR   0xff8c0010
  60
  61 #endif