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 
9 static 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 
22 static 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  */
38 enum 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  */
95 u32 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