LXR uboot/drivers/ddr/marvell/a38x/mv_ddr_sys_env

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) Marvell International Ltd. and its affiliates
   4 */
   5
   6#include "mv_ddr_regs.h"
   7#include "mv_ddr_sys_env_lib.h"
   8
   9static u32 mv_ddr_board_id_get(void)
  10{
  11#if defined(CONFIG_TARGET_DB_88F6820_GP)
  12        return DB_GP_68XX_ID;
  13#else
  14        /*
  15         * Return 0 here for custom board as this should not be used
  16         * for custom boards.
  17         */
  18        return 0;
  19#endif
  20}
  21
  22static u32 mv_ddr_board_id_index_get(u32 board_id)
  23{
  24        /*
  25         * Marvell Boards use 0x10 as base for Board ID:
  26         * mask MSB to receive index for board ID
  27         */
  28        return board_id & (MARVELL_BOARD_ID_MASK - 1);
  29}
  30
  31/*
  32 * read gpio input for suspend-wakeup indication
  33 * return indicating suspend wakeup status:
  34 * 0 - not supported,
  35 * 1 - supported: read magic word detect wakeup,
  36 * 2 - detected wakeup from gpio
  37 */
  38enum suspend_wakeup_status mv_ddr_sys_env_suspend_wakeup_check(void)
  39{
  40        u32 reg, board_id_index, gpio;
  41        struct board_wakeup_gpio board_gpio[] = MV_BOARD_WAKEUP_GPIO_INFO;
  42
  43        board_id_index = mv_ddr_board_id_index_get(mv_ddr_board_id_get());
  44        if (!(sizeof(board_gpio) / sizeof(struct board_wakeup_gpio) >
  45              board_id_index)) {
  46                printf("\n_failed loading Suspend-Wakeup information (invalid board ID)\n");
  47                return SUSPEND_WAKEUP_DISABLED;
  48        }
  49
  50        /*
  51         * - Detect if Suspend-Wakeup is supported on current board
  52         * - Fetch the GPIO number for wakeup status input indication
  53         */
  54        if (board_gpio[board_id_index].gpio_num == -1) {
  55                /* Suspend to RAM is not supported */
  56                return SUSPEND_WAKEUP_DISABLED;
  57        } else if (board_gpio[board_id_index].gpio_num == -2) {
  58                /*
  59                 * Suspend to RAM is supported but GPIO indication is
  60                 * not implemented - Skip
  61                 */
  62                return SUSPEND_WAKEUP_ENABLED;
  63        } else {
  64                gpio = board_gpio[board_id_index].gpio_num;
  65        }
  66
  67        /* Initialize MPP for GPIO (set MPP = 0x0) */
  68        reg = reg_read(MPP_CONTROL_REG(MPP_REG_NUM(gpio)));
  69        /* reset MPP21 to 0x0, keep rest of MPP settings*/
  70        reg &= ~MPP_MASK(gpio);
  71        reg_write(MPP_CONTROL_REG(MPP_REG_NUM(gpio)), reg);
  72
  73        /* Initialize GPIO as input */
  74        reg = reg_read(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio)));
  75        reg |= GPP_MASK(gpio);
  76        reg_write(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio)), reg);
  77
  78        /*
  79         * Check GPP for input status from PIC: 0 - regular init,
  80         * 1 - suspend wakeup
  81         */
  82        reg = reg_read(GPP_DATA_IN_REG(GPP_REG_NUM(gpio)));
  83
  84        /* if GPIO is ON: wakeup from S2RAM indication detected */
  85        return (reg & GPP_MASK(gpio)) ? SUSPEND_WAKEUP_ENABLED_GPIO_DETECTED :
  86                SUSPEND_WAKEUP_DISABLED;
  87}
  88
  89/*
  90 * get bit mask of enabled cs
  91 * return bit mask of enabled cs:
  92 * 1 - only cs0 enabled,
  93 * 3 - both cs0 and cs1 enabled
  94 */
  95u32 mv_ddr_sys_env_get_cs_ena_from_reg(void)
  96{
  97        return reg_read(DDR3_RANK_CTRL_REG) &
  98                ((CS_EXIST_MASK << CS_EXIST_OFFS(0)) |
  99                 (CS_EXIST_MASK << CS_EXIST_OFFS(1)) |
 100                 (CS_EXIST_MASK << CS_EXIST_OFFS(2)) |
 101                 (CS_EXIST_MASK << CS_EXIST_OFFS(3)));
 102}
 103