1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (C) Guangzhou FriendlyARM Computer Tech. Co., Ltd.
4 * (http://www.friendlyarm.com)
5 */
6
7#include <config.h>
8#include <common.h>
9#include <i2c.h>
10#include <asm/io.h>
11
12#include <asm/arch/nexell.h>
13#include <asm/arch/nx_gpio.h>
14
15/* Board revision list: <PCB3 | PCB2 | PCB1>
16 *  0b000 - NanoPi 2
17 *  0b001 - NanoPC-T2
18 *  0b010 - NanoPi S2
19 *  0b011 - Smart4418
20 *  0b100 - NanoPi Fire 2A
21 *  0b111 - NanoPi M2A
22 *
23 * Extented revision:
24 *  0b001 - Smart4418-SDK
25 */
26#define __IO_GRP		2	/* GPIO_C */
27#define __IO_PCB1		26
28#define __IO_PCB2		27
29#define __IO_PCB3		25
30
31static int pcb_rev = -1;
32static int base_rev;
33
34static void bd_hwrev_config_gpio(void)
35{
36	int gpios[3][2] = {
37		{ __IO_PCB1, 1 },
38		{ __IO_PCB2, 1 },
39		{ __IO_PCB3, 1 },
40	};
41	int i;
42
43	/* gpio input mode, pull-down */
44	for (i = 0; i < 3; i++) {
45		nx_gpio_set_pad_function(__IO_GRP, gpios[i][0], gpios[i][1]);
46		nx_gpio_set_output_enable(__IO_GRP, gpios[i][0], 0);
47		nx_gpio_set_pull_mode(__IO_GRP, gpios[i][0], 0);
48	}
49}
50
51void bd_hwrev_init(void)
52{
53	if (pcb_rev >= 0)
54		return;
55
56	bd_hwrev_config_gpio();
57
58	pcb_rev  = nx_gpio_get_input_value(__IO_GRP, __IO_PCB1);
59	pcb_rev |= nx_gpio_get_input_value(__IO_GRP, __IO_PCB2) << 1;
60	pcb_rev |= nx_gpio_get_input_value(__IO_GRP, __IO_PCB3) << 2;
61}
62
63/* Get extended revision for SmartXX18 */
64void bd_base_rev_init(void)
65{
66	struct udevice *dev;
67	u8 val = 0;
68
69	if (pcb_rev != 0x3)
70		return;
71
72#define PCA9536_I2C_BUS     2
73#define PCA9636_I2C_ADDR    0x41
74	if (i2c_get_chip_for_busnum
75				(PCA9536_I2C_BUS, PCA9636_I2C_ADDR, 1, &dev))
76		return;
77
78	if (!dm_i2c_read(dev, 0, &val, 1))
79		base_rev = (val & 0xf);
80}
81
82/* To override __weak symbols */
83u32 get_board_revision(void)
84{
85	return (base_rev << 8) | pcb_rev;
86}
87
88#ifdef CONFIG_REVISION_TAG
89u32 get_board_rev(void)
90{
91	return get_board_revision();
92}
93#endif
94
95const char *get_board_name(void)
96{
97	bd_hwrev_init();
98
99	switch (pcb_rev) {
100	case 0:
101		return "NanoPi 2";
102	case 1:
103		return "NanoPC-T2";
104	case 2:
105		return "NanoPi S2";
106	case 3:
107		return "Smart4418";
108	case 4:
109		return "NanoPi Fire 2A";
110	case 7:
111		return "NanoPi M2A";
112	default:
113		return "s5p4418-X";
114	}
115}
116