diff options
Diffstat (limited to 'drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c')
| -rw-r--r-- | drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c b/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c new file mode 100644 index 0000000000..c9c6899e72 --- /dev/null +++ b/drivers/ddr/marvell/a38x/mv_ddr_sys_env_lib.c @@ -0,0 +1,102 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) Marvell International Ltd. and its affiliates + */ + +#include "mv_ddr_regs.h" +#include "mv_ddr_sys_env_lib.h" + +static u32 mv_ddr_board_id_get(void) +{ +#if defined(CONFIG_TARGET_DB_88F6820_GP) + return DB_GP_68XX_ID; +#else + /* + * Return 0 here for custom board as this should not be used + * for custom boards. + */ + return 0; +#endif +} + +static u32 mv_ddr_board_id_index_get(u32 board_id) +{ + /* + * Marvell Boards use 0x10 as base for Board ID: + * mask MSB to receive index for board ID + */ + return board_id & (MARVELL_BOARD_ID_MASK - 1); +} + +/* + * read gpio input for suspend-wakeup indication + * return indicating suspend wakeup status: + * 0 - not supported, + * 1 - supported: read magic word detect wakeup, + * 2 - detected wakeup from gpio + */ +enum suspend_wakeup_status mv_ddr_sys_env_suspend_wakeup_check(void) +{ + u32 reg, board_id_index, gpio; + struct board_wakeup_gpio board_gpio[] = MV_BOARD_WAKEUP_GPIO_INFO; + + board_id_index = mv_ddr_board_id_index_get(mv_ddr_board_id_get()); + if (!(sizeof(board_gpio) / sizeof(struct board_wakeup_gpio) > + board_id_index)) { + printf("\n_failed loading Suspend-Wakeup information (invalid board ID)\n"); + return SUSPEND_WAKEUP_DISABLED; + } + + /* + * - Detect if Suspend-Wakeup is supported on current board + * - Fetch the GPIO number for wakeup status input indication + */ + if (board_gpio[board_id_index].gpio_num == -1) { + /* Suspend to RAM is not supported */ + return SUSPEND_WAKEUP_DISABLED; + } else if (board_gpio[board_id_index].gpio_num == -2) { + /* + * Suspend to RAM is supported but GPIO indication is + * not implemented - Skip + */ + return SUSPEND_WAKEUP_ENABLED; + } else { + gpio = board_gpio[board_id_index].gpio_num; + } + + /* Initialize MPP for GPIO (set MPP = 0x0) */ + reg = reg_read(MPP_CONTROL_REG(MPP_REG_NUM(gpio))); + /* reset MPP21 to 0x0, keep rest of MPP settings*/ + reg &= ~MPP_MASK(gpio); + reg_write(MPP_CONTROL_REG(MPP_REG_NUM(gpio)), reg); + + /* Initialize GPIO as input */ + reg = reg_read(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio))); + reg |= GPP_MASK(gpio); + reg_write(GPP_DATA_OUT_EN_REG(GPP_REG_NUM(gpio)), reg); + + /* + * Check GPP for input status from PIC: 0 - regular init, + * 1 - suspend wakeup + */ + reg = reg_read(GPP_DATA_IN_REG(GPP_REG_NUM(gpio))); + + /* if GPIO is ON: wakeup from S2RAM indication detected */ + return (reg & GPP_MASK(gpio)) ? SUSPEND_WAKEUP_ENABLED_GPIO_DETECTED : + SUSPEND_WAKEUP_DISABLED; +} + +/* + * get bit mask of enabled cs + * return bit mask of enabled cs: + * 1 - only cs0 enabled, + * 3 - both cs0 and cs1 enabled + */ +u32 mv_ddr_sys_env_get_cs_ena_from_reg(void) +{ + return reg_read(DDR3_RANK_CTRL_REG) & + ((CS_EXIST_MASK << CS_EXIST_OFFS(0)) | + (CS_EXIST_MASK << CS_EXIST_OFFS(1)) | + (CS_EXIST_MASK << CS_EXIST_OFFS(2)) | + (CS_EXIST_MASK << CS_EXIST_OFFS(3))); +} |