u-boot-imx/include/flintstone_lpgpr.h

/*
 * Copyright (C) 2017 Nest labs, Inc.
 *
 * 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.
 */

/* Mirrored by reset-decoder */

/*
 *                        LPGPR register field descriptions
 *
 *  bits  -                          description
 * 31..16 - U-Boot Magic Value (0xB001)
 *          A signature used to guard against parsing invalid data
 *     15 - Reset Cause Written
 *          Since this function causes a cold reset upon detecting a warm reset,
 *          this bit is needed to signal that we've already written state to
 *          SNVS, and thus should continue booting.
 *     14 - Watchdog State
 *          Enumerated in wdog_state, this value is undefined if the reset
 *          cause in SRC_SRSR is not WDOG (0x10).
 * 13..12 - PMIC state
 *          Enumerated in struct pmic_state
 *  11..3 - SRC_SRSR
 *          The lowest 9 bits of the SRC_SRSR register, with warm_boot (bit 16)
 *          moved to bit 1
 *   2..0 - Bootcount
 */

#define LPGPR_BOOTCOUNT_SHIFT 0
#define LPGPR_BOOTCOUNT_MASK (0x7 << LPGPR_BOOTCOUNT_SHIFT)

#define LPGPR_SRSR_SHIFT 3
#define LPGPR_SRSR_MASK (0x1FF << LPGPR_SRSR_SHIFT)

#define LPGPR_PMIC_STATE_SHIFT 12
#define LPGPR_PMIC_STATE_MASK (0x3UL << LPGPR_PMIC_STATE_SHIFT)

#define LPGPR_WRSR_SHIFT 14
#define LPGPR_WRSR_MASK (0x1UL << LPGPR_WRSR_SHIFT)

/* The warm_boot bit is at bit 16 in SRC_SRSR. Shift it down
 * to bit 1, which is always set to zero, to save space */
#define LPGPR_SRSR_WARM_BOOT_ADJ 15
#define LPGPR_SRSR_WARM_BOOT_MASK 2

#define LPGPR_RESET_CAUSE_WRITTEN (1UL << 15)

#define PMIC_DEFAULT_STBYDLY_VALUE 0x1
#define PMIC_NON_DEFAULT_STBYDLY_VALUE 0x2

#define PMIC_DEFAULT_MEMA_VALUE 0x00
#define PMIC_NON_DEFAULT_MEMA_VALUE 0xDE

#define LPGPR_UBOOT_MAGIC_SHIFT 16
#define LPGPR_UBOOT_MAGIC_MASK (0xFFFFUL << LPGPR_UBOOT_MAGIC_SHIFT)
#define LPGPR_UBOOT_MAGIC_VALUE 0xB001

enum pmic_state {
	resurrected, /* was without power for >20 s */
	reset,
	still_on,
	unknown
};

enum wdog_state {
	sftw, /* Software Reset (SRS) */
	tout /* Timeout */
};