1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2024 PHYTEC Messtechnik GmbH
4 * Author: Daniel Schultz <d.schultz@phytec.de>
5 */
6
7 #include <asm/arch/hardware.h>
8
9 #include "am6_som_detection.h"
10
11 extern struct phytec_eeprom_data eeprom_data;
12
13 #if IS_ENABLED(CONFIG_PHYTEC_AM62_SOM_DETECTION) || \
14 IS_ENABLED(CONFIG_PHYTEC_AM62A_SOM_DETECTION) || \
15 IS_ENABLED(CONFIG_PHYTEC_AM64_SOM_DETECTION)
16
17 /* Check if the SoM is actually one of the following products:
18 * - phyCORE-AM62x
19 * - phyCORE-AM62Ax
20 * - phyCORE-AM64x
21 *
22 * Returns 0 in case it's a known SoM. Otherwise, returns -1.
23 */
phytec_am6_detect(struct phytec_eeprom_data * data)24 int phytec_am6_detect(struct phytec_eeprom_data *data)
25 {
26 char *opt;
27 u8 som;
28
29 if (!data)
30 data = &eeprom_data;
31
32 /* We cannot do the check for early API revisions */
33 if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
34 return -1;
35
36 som = data->payload.data.data_api2.som_no;
37 debug("%s: som id: %u\n", __func__, som);
38
39 opt = phytec_get_opt(data);
40 if (!opt)
41 return -1;
42
43 if (som == PHYTEC_AM62X_SOM && soc_is_am62x())
44 return 0;
45
46 if (som == PHYTEC_AM62AX_SOM && soc_is_am62ax())
47 return 0;
48
49 if (som == PHYTEC_AM64X_SOM && soc_is_am64x())
50 return 0;
51
52 return -1;
53 }
54
phytec_check_opt(struct phytec_eeprom_data * data,u8 option)55 static u8 phytec_check_opt(struct phytec_eeprom_data *data, u8 option)
56 {
57 char *opt;
58
59 if (!data)
60 data = &eeprom_data;
61
62 if (!data->valid || data->payload.api_rev < PHYTEC_API_REV2)
63 return PHYTEC_EEPROM_INVAL;
64
65 if (option > 8)
66 return PHYTEC_EEPROM_INVAL;
67
68 opt = phytec_get_opt(data);
69 if (opt)
70 return PHYTEC_GET_OPTION(opt[option]);
71 return PHYTEC_EEPROM_INVAL;
72 }
73
74 /*
75 * Reads LPDDR4 ram size from EEPROM.
76 *
77 * returns:
78 * - The size
79 * - PHYTEC_EEPROM_INVAL when the data is invalid.
80 */
phytec_get_am6_ddr_size(struct phytec_eeprom_data * data)81 u8 __maybe_unused phytec_get_am6_ddr_size(struct phytec_eeprom_data *data)
82 {
83 u8 ddr_id = phytec_check_opt(data, 3);
84
85 pr_debug("%s: ddr id: %u\n", __func__, ddr_id);
86 return ddr_id;
87 }
88
89 /*
90 * Reads SPI-NOR flash size and type from EEPROM.
91 *
92 * returns:
93 * - PHYTEC_EEPROM_VALUE_X if no SPI is poulated.
94 * - Otherwise a board depended code for the size.
95 * - PHYTEC_EEPROM_INVAL when the data is invalid.
96 */
phytec_get_am6_spi(struct phytec_eeprom_data * data)97 u8 __maybe_unused phytec_get_am6_spi(struct phytec_eeprom_data *data)
98 {
99 u8 spi = phytec_check_opt(data, 5);
100
101 pr_debug("%s: spi: %u\n", __func__, spi);
102 return spi;
103 }
104
105 /*
106 * Reads Ethernet phy information from EEPROM.
107 *
108 * returns:
109 * - 0x0 no ethernet phy is populated.
110 * - 0x1 if 10/100/1000 MBit Phy is populated.
111 * - PHYTEC_EEPROM_INVAL when the data is invalid.
112 */
phytec_get_am6_eth(struct phytec_eeprom_data * data)113 u8 __maybe_unused phytec_get_am6_eth(struct phytec_eeprom_data *data)
114 {
115 u8 eth = phytec_check_opt(data, 6);
116
117 pr_debug("%s: eth: %u\n", __func__, eth);
118 return eth;
119 }
120
121 /*
122 * Reads RTC information from EEPROM.
123 *
124 * returns:
125 * - 0 if no RTC is poulated.
126 * - 1 if it is populated.
127 * - PHYTEC_EEPROM_INVAL when the data is invalid.
128 */
phytec_get_am6_rtc(struct phytec_eeprom_data * data)129 u8 __maybe_unused phytec_get_am6_rtc(struct phytec_eeprom_data *data)
130 {
131 u8 rtc = phytec_check_opt(data, 7);
132
133 pr_debug("%s: rtc: %u\n", __func__, rtc);
134 return rtc;
135 }
136
137 #else
138
phytec_am6_detect(struct phytec_eeprom_data * data)139 inline int __maybe_unused phytec_am6_detect(struct phytec_eeprom_data *data)
140 {
141 return -1;
142 }
143
144 inline u8 __maybe_unused
phytec_get_am6_ddr_size(struct phytec_eeprom_data * data)145 phytec_get_am6_ddr_size(struct phytec_eeprom_data *data)
146 {
147 return PHYTEC_EEPROM_INVAL;
148 }
149
phytec_get_am6_spi(struct phytec_eeprom_data * data)150 inline u8 __maybe_unused phytec_get_am6_spi(struct phytec_eeprom_data *data)
151 {
152 return PHYTEC_EEPROM_INVAL;
153 }
154
phytec_get_am6_eth(struct phytec_eeprom_data * data)155 inline u8 __maybe_unused phytec_get_am6_eth(struct phytec_eeprom_data *data)
156 {
157 return PHYTEC_EEPROM_INVAL;
158 }
159
phytec_get_am6_rtc(struct phytec_eeprom_data * data)160 inline u8 __maybe_unused phytec_get_am6_rtc(struct phytec_eeprom_data *data)
161 {
162 return PHYTEC_EEPROM_INVAL;
163 }
164 #endif
165