1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) 2020 BayLibre, SAS
4 * Author: Neil Armstrong <narmstrong@baylibre.com>
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <adc.h>
10#include <env.h>
11#include <init.h>
12#include <net.h>
13#include <asm/io.h>
14#include <asm/arch/boot.h>
15#include <asm/arch/sm.h>
16#include <asm/arch/eth.h>
17#include <asm/arch/boot.h>
18
19#define EFUSE_MAC_OFFSET	20
20#define EFUSE_MAC_SIZE		12
21#define MAC_ADDR_LEN		6
22
23#define ODROID_HW_VS_ADC_CHANNEL	1
24
25#define MESON_SOC_ID_G12B	0x29
26#define MESON_SOC_ID_SM1	0x2b
27
28int mmc_get_env_dev(void)
29{
30	if (meson_get_boot_device() == BOOT_DEVICE_EMMC)
31		return 1;
32	return 0;
33}
34
35/* Variant detection is based on the ADC RAW values for the channel #1 */
36static struct meson_odroid_boards {
37	unsigned int soc_id;
38	unsigned int adc_min;
39	unsigned int adc_max;
40	char *variant;
41} boards[] = {
42	/* OdroidN2 rev 2018,7,23 */
43	{ MESON_SOC_ID_G12B, 80 * 4,  90 * 4, "n2" },
44	/* OdroidN2 rev 2018,12,6 */
45	{ MESON_SOC_ID_G12B, 160 * 4, 170 * 4, "n2" },
46	/* OdroidN2 rev 2019,1,17 */
47	{ MESON_SOC_ID_G12B, 245 * 4, 255 * 4, "n2" },
48	/* OdroidN2 rev 2019,2,7 */
49	{ MESON_SOC_ID_G12B, 330 * 4, 350 * 4, "n2" },
50	/* OdroidN2plus rev 2019,11,20 */
51	{ MESON_SOC_ID_G12B, 410 * 4, 430 * 4, "n2-plus" },
52	/* OdroidC4 rev 2020,01,29 */
53	{ MESON_SOC_ID_SM1,   80 * 4, 100 * 4, "c4" },
54	/* OdroidHC4 rev 2019,12,10 */
55	{ MESON_SOC_ID_SM1,  300 * 4, 320 * 4, "hc4" },
56	/* OdroidC4 rev 2019,11,29 */
57	{ MESON_SOC_ID_SM1,  335 * 4, 345 * 4, "c4" },
58	/* OdroidHC4 rev 2020,8,7 */
59	{ MESON_SOC_ID_SM1,  590 * 4, 610 * 4, "hc4" },
60};
61
62static void odroid_set_fdtfile(char *soc, char *variant)
63{
64	char s[128];
65
66	snprintf(s, sizeof(s), "amlogic/meson-%s-odroid-%s.dtb", soc, variant);
67	env_set("fdtfile", s);
68}
69
70static int odroid_detect_variant(void)
71{
72	char *variant = "", *soc = "";
73	unsigned int adcval = 0;
74	int ret, i, soc_id = 0;
75
76	if (of_machine_is_compatible("amlogic,sm1")) {
77		soc_id = MESON_SOC_ID_SM1;
78		soc = "sm1";
79	} else if (of_machine_is_compatible("amlogic,g12b")) {
80		soc_id = MESON_SOC_ID_G12B;
81		soc = "g12b";
82	} else {
83		return -1;
84	}
85
86	ret = adc_channel_single_shot("adc@9000", ODROID_HW_VS_ADC_CHANNEL,
87				      &adcval);
88	if (ret)
89		return ret;
90
91	for (i = 0 ; i < ARRAY_SIZE(boards) ; ++i) {
92		if (soc_id == boards[i].soc_id &&
93		    adcval >= boards[i].adc_min &&
94		    adcval < boards[i].adc_max) {
95			variant = boards[i].variant;
96			break;
97		}
98	}
99
100	printf("Board variant: %s\n", variant);
101	env_set("variant", variant);
102
103	odroid_set_fdtfile(soc, variant);
104
105	return 0;
106}
107
108int misc_init_r(void)
109{
110	u8 mac_addr[MAC_ADDR_LEN + 1];
111	char efuse_mac_addr[EFUSE_MAC_SIZE], tmp[3];
112	ssize_t len;
113
114	if (IS_ENABLED(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG) &&
115	    meson_get_soc_rev(tmp, sizeof(tmp)) > 0)
116		env_set("soc_rev", tmp);
117
118	if (!eth_env_get_enetaddr("ethaddr", mac_addr)) {
119		len = meson_sm_read_efuse(EFUSE_MAC_OFFSET,
120					  efuse_mac_addr, EFUSE_MAC_SIZE);
121		if (len != EFUSE_MAC_SIZE)
122			return 0;
123
124		/* MAC is stored in ASCII format, 1bytes = 2characters */
125		for (int i = 0; i < 6; i++) {
126			tmp[0] = efuse_mac_addr[i * 2];
127			tmp[1] = efuse_mac_addr[i * 2 + 1];
128			tmp[2] = '\0';
129			mac_addr[i] = hextoul(tmp, NULL);
130		}
131		mac_addr[MAC_ADDR_LEN] = '\0';
132
133		if (is_valid_ethaddr(mac_addr))
134			eth_env_set_enetaddr("ethaddr", mac_addr);
135		else
136			meson_generate_serial_ethaddr();
137	}
138
139	odroid_detect_variant();
140	return 0;
141}
142