xref: /rk3399_rockchip-uboot/board/gateworks/gw_ventana/gsc.c (revision 45af3f74bcbfebcd1a9ad365aa7f63f31f3acbc2)
1 /*
2  * Copyright (C) 2013 Gateworks Corporation
3  *
4  * Author: Tim Harvey <tharvey@gateworks.com>
5  *
6  * SPDX-License-Identifier: GPL-2.0+
7  */
8 
9 #include <asm/errno.h>
10 #include <common.h>
11 #include <i2c.h>
12 #include <linux/ctype.h>
13 
14 #include "gsc.h"
15 
16 /*
17  * The Gateworks System Controller will fail to ACK a master transaction if
18  * it is busy, which can occur during its 1HZ timer tick while reading ADC's.
19  * When this does occur, it will never be busy long enough to fail more than
20  * 2 back-to-back transfers.  Thus we wrap i2c_read and i2c_write with
21  * 3 retries.
22  */
23 int gsc_i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
24 {
25 	int retry = 3;
26 	int n = 0;
27 	int ret;
28 
29 	while (n++ < retry) {
30 		ret = i2c_read(chip, addr, alen, buf, len);
31 		if (!ret)
32 			break;
33 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
34 		      n, ret);
35 		if (ret != -ENODEV)
36 			break;
37 		mdelay(10);
38 	}
39 	return ret;
40 }
41 
42 int gsc_i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
43 {
44 	int retry = 3;
45 	int n = 0;
46 	int ret;
47 
48 	while (n++ < retry) {
49 		ret = i2c_write(chip, addr, alen, buf, len);
50 		if (!ret)
51 			break;
52 		debug("%s: 0x%02x 0x%02x retry%d: %d\n", __func__, chip, addr,
53 		      n, ret);
54 		if (ret != -ENODEV)
55 			break;
56 		mdelay(10);
57 	}
58 	mdelay(100);
59 	return ret;
60 }
61 
62 #ifdef CONFIG_CMD_GSC
63 static void read_hwmon(const char *name, uint reg, uint size)
64 {
65 	unsigned char buf[3];
66 	uint ui;
67 
68 	printf("%-8s:", name);
69 	memset(buf, 0, sizeof(buf));
70 	if (gsc_i2c_read(GSC_HWMON_ADDR, reg, 1, buf, size)) {
71 		puts("fRD\n");
72 	} else {
73 		ui = buf[0] | (buf[1]<<8) | (buf[2]<<16);
74 		if (ui == 0xffffff)
75 			puts("invalid\n");
76 		else
77 			printf("%d\n", ui);
78 	}
79 }
80 
81 int do_gsc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
82 {
83 	const char *model = getenv("model");
84 
85 	i2c_set_bus_num(0);
86 	read_hwmon("Temp",     GSC_HWMON_TEMP, 2);
87 	read_hwmon("VIN",      GSC_HWMON_VIN, 3);
88 	read_hwmon("VBATT",    GSC_HWMON_VBATT, 3);
89 	read_hwmon("VDD_3P3",  GSC_HWMON_VDD_3P3, 3);
90 	read_hwmon("VDD_ARM",  GSC_HWMON_VDD_CORE, 3);
91 	read_hwmon("VDD_SOC",  GSC_HWMON_VDD_SOC, 3);
92 	read_hwmon("VDD_HIGH", GSC_HWMON_VDD_HIGH, 3);
93 	read_hwmon("VDD_DDR",  GSC_HWMON_VDD_DDR, 3);
94 	read_hwmon("VDD_5P0",  GSC_HWMON_VDD_5P0, 3);
95 	read_hwmon("VDD_2P5",  GSC_HWMON_VDD_2P5, 3);
96 	read_hwmon("VDD_1P8",  GSC_HWMON_VDD_1P8, 3);
97 	read_hwmon("VDD_IO2",  GSC_HWMON_VDD_IO2, 3);
98 	switch (model[3]) {
99 	case '1': /* GW51xx */
100 		read_hwmon("VDD_IO3",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
101 		break;
102 	case '2': /* GW52xx */
103 		break;
104 	case '3': /* GW53xx */
105 		read_hwmon("VDD_IO4",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
106 		read_hwmon("VDD_GPS",  GSC_HWMON_VDD_IO3, 3);
107 		break;
108 	case '4': /* GW54xx */
109 		read_hwmon("VDD_IO3",  GSC_HWMON_VDD_IO4, 3); /* -C rev */
110 		read_hwmon("VDD_GPS",  GSC_HWMON_VDD_IO3, 3);
111 		break;
112 	case '5': /* GW55xx */
113 		break;
114 	}
115 	return 0;
116 }
117 
118 U_BOOT_CMD(gsc, 1, 1, do_gsc,
119 	   "GSC test",
120 	   ""
121 );
122 
123 #endif /* CONFIG_CMD_GSC */
124