1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2015 Samsung Electronics
4 * Przemyslaw Marczak <p.marczak@samsung.com>
5 */
6
7 #include <common.h>
8 #include <adc.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <fdtdec.h>
12 #include <asm/global_data.h>
13 #include <linux/delay.h>
14 #include <power/pmic.h>
15 #include <power/regulator.h>
16 #include <power/s2mps11.h>
17 #include <samsung/exynos5-dt-types.h>
18 #include <samsung/misc.h>
19
20 DECLARE_GLOBAL_DATA_PTR;
21
22 static const struct udevice_id board_ids[] = {
23 { .compatible = "samsung,odroidxu3", .data = EXYNOS5_BOARD_ODROID_XU3 },
24 { .compatible = "samsung,exynos5", .data = EXYNOS5_BOARD_GENERIC },
25 { },
26 };
27
28 /**
29 * Odroix XU3/XU4/HC1/HC2 board revisions (from HC1+_HC2_MAIN_REV0.1_20171017.pdf):
30 * Rev ADCmax Board
31 * 0.1 0 XU3 0.1
32 * 0.2 372 XU3 0.2 | XU3L - no DISPLAYPORT (probe I2C0:0x40 / INA231)
33 * 0.3 1280 XU4 0.1
34 * 0.4 739 XU4 0.2
35 * 0.5 1016 XU4+Air0.1 (Passive cooling)
36 * 0.6 1309 XU4-HC1 0.1
37 * 0.7 1470 XU4-HC1+ 0.1 (HC2)
38 * Use +1% for ADC value tolerance in the array below, the code loops until
39 * the measured ADC value is lower than then ADCmax from the array.
40 */
41 struct odroid_rev_info odroid_info[] = {
42 { EXYNOS5_BOARD_ODROID_XU3_REV01, 1, 10, "xu3" },
43 { EXYNOS5_BOARD_ODROID_XU3_REV02, 2, 375, "xu3" },
44 { EXYNOS5_BOARD_ODROID_XU4_REV01, 1, 1293, "xu4" },
45 { EXYNOS5_BOARD_ODROID_HC1_REV01, 1, 1322, "hc1" },
46 { EXYNOS5_BOARD_ODROID_HC2_REV01, 1, 1484, "hc1" },
47 { EXYNOS5_BOARD_ODROID_UNKNOWN, 0, 4095, "unknown" },
48 };
49
50 /*
51 * Read ADC at least twice and check the resuls. If regulator providing voltage
52 * on to measured point was just turned on, first reads might require time
53 * to stabilize.
54 */
odroid_get_adc_val(unsigned int * adcval)55 static int odroid_get_adc_val(unsigned int *adcval)
56 {
57 unsigned int adcval_prev = 0;
58 int ret, retries = 20;
59
60 ret = adc_channel_single_shot("adc@12D10000", CONFIG_ODROID_REV_AIN,
61 &adcval_prev);
62 if (ret)
63 return ret;
64
65 while (retries--) {
66 mdelay(5);
67
68 ret = adc_channel_single_shot("adc@12D10000",
69 CONFIG_ODROID_REV_AIN, adcval);
70 if (ret)
71 return ret;
72
73 /*
74 * If difference between ADC reads is less than 3%,
75 * accept the result
76 */
77 if ((100 * abs(*adcval - adcval_prev) / adcval_prev) < 3)
78 return ret;
79
80 adcval_prev = *adcval;
81 }
82
83 return ret;
84 }
85
odroid_get_board_type(void)86 static int odroid_get_board_type(void)
87 {
88 unsigned int adcval;
89 int ret, i;
90
91 ret = odroid_get_adc_val(&adcval);
92 if (ret)
93 goto rev_default;
94
95 for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
96 /* ADC tolerance: +1% */
97 if (adcval < odroid_info[i].adc_val)
98 return odroid_info[i].board_type;
99 }
100
101 rev_default:
102 return EXYNOS5_BOARD_ODROID_XU3;
103 }
104
105 /**
106 * odroid_get_type_str - returns pointer to one of the board type string.
107 * Board types: "xu3", "xu3-lite", "xu4". However the "xu3lite" can be
108 * detected only when the i2c controller is ready to use. Fortunately,
109 * XU3 and XU3L are compatible, and the information about board lite
110 * revision is needed before booting the linux, to set proper environment
111 * variable: $fdtfile.
112 */
odroid_get_type_str(void)113 static const char *odroid_get_type_str(void)
114 {
115 const char *type_xu3l = "xu3-lite";
116 struct udevice *dev, *chip;
117 int i, ret;
118
119 if (gd->board_type != EXYNOS5_BOARD_ODROID_XU3_REV02)
120 goto exit;
121
122 ret = pmic_get("s2mps11_pmic@66", &dev);
123 if (ret)
124 goto exit;
125
126 /* Enable LDO26: 3.0V */
127 ret = pmic_reg_write(dev, S2MPS11_REG_L26CTRL,
128 S2MPS11_LDO26_ENABLE);
129 if (ret)
130 goto exit;
131
132 /* Check XU3Lite by probe INA231 I2C0:0x40 */
133 ret = uclass_get_device(UCLASS_I2C, 0, &dev);
134 if (ret)
135 goto exit;
136
137 ret = dm_i2c_probe(dev, 0x40, 0x0, &chip);
138 if (ret)
139 return type_xu3l;
140
141 exit:
142 for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
143 if (odroid_info[i].board_type == gd->board_type)
144 return odroid_info[i].name;
145 }
146
147 return NULL;
148 }
149
board_is_odroidxu3(void)150 bool board_is_odroidxu3(void)
151 {
152 if (gd->board_type >= EXYNOS5_BOARD_ODROID_XU3 &&
153 gd->board_type <= EXYNOS5_BOARD_ODROID_XU3_REV02)
154 return true;
155
156 return false;
157 }
158
board_is_odroidxu4(void)159 bool board_is_odroidxu4(void)
160 {
161 if (gd->board_type == EXYNOS5_BOARD_ODROID_XU4_REV01)
162 return true;
163
164 return false;
165 }
166
board_is_odroidhc1(void)167 bool board_is_odroidhc1(void)
168 {
169 if (gd->board_type == EXYNOS5_BOARD_ODROID_HC1_REV01)
170 return true;
171
172 return false;
173 }
174
board_is_odroidhc2(void)175 bool board_is_odroidhc2(void)
176 {
177 if (gd->board_type == EXYNOS5_BOARD_ODROID_HC2_REV01)
178 return true;
179
180 return false;
181 }
182
board_is_generic(void)183 bool board_is_generic(void)
184 {
185 if (gd->board_type == EXYNOS5_BOARD_GENERIC)
186 return true;
187
188 return false;
189 }
190
191 #ifdef CONFIG_REVISION_TAG
odroid_get_rev(void)192 static unsigned int odroid_get_rev(void)
193 {
194 int i;
195
196 for (i = 0; i < ARRAY_SIZE(odroid_info); i++) {
197 if (odroid_info[i].board_type == gd->board_type)
198 return odroid_info[i].board_rev;
199 }
200
201 return 0;
202 }
203
204 /**
205 * get_board_rev() - return detected board revision.
206 *
207 * @return: return board revision number for XU3 or 0 for generic
208 */
get_board_rev(void)209 u32 get_board_rev(void)
210 {
211 if (board_is_generic())
212 return 0;
213
214 return odroid_get_rev();
215 }
216 #endif
217
218 /**
219 * get_board_type() - returns board type string.
220 *
221 * @return: return board type string for XU3 or empty string for generic
222 */
get_board_type(void)223 const char *get_board_type(void)
224 {
225 const char *generic = "";
226
227 if (board_is_generic())
228 return generic;
229
230 return odroid_get_type_str();
231 }
232
233 /**
234 * set_board_type() - set board type in gd->board_type.
235 * As default type set EXYNOS5_BOARD_GENERIC. If Odroid is detected,
236 * set its proper type based on device tree.
237 *
238 * This might be called early when some more specific ways to detect revision
239 * are not yet available.
240 */
set_board_type(void)241 void set_board_type(void)
242 {
243 const struct udevice_id *of_match = board_ids;
244 int ret;
245
246 gd->board_type = EXYNOS5_BOARD_GENERIC;
247
248 while (of_match->compatible) {
249 ret = fdt_node_check_compatible(gd->fdt_blob, 0,
250 of_match->compatible);
251 if (ret)
252 of_match++;
253
254 gd->board_type = of_match->data;
255 break;
256 }
257 }
258
259 /**
260 * set_board_revision() - set detailed board type in gd->board_type.
261 * Should be called when resources (e.g. regulators) are available
262 * so ADC can be used to detect the specific revision of a board.
263 */
set_board_revision(void)264 void set_board_revision(void)
265 {
266 if (board_is_odroidxu3())
267 gd->board_type = odroid_get_board_type();
268 }
269