1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
4 * Dave Gerlach <d-gerlach@ti.com>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <soc.h>
10
11 #include <asm/io.h>
12
13 #define AM65X 0xbb5a
14 #define J721E 0xbb64
15 #define J7200 0xbb6d
16
17 #define REV_SR1_0 0
18 #define REV_SR2_0 1
19
20 #define JTAG_ID_VARIANT_SHIFT 28
21 #define JTAG_ID_VARIANT_MASK (0xf << 28)
22 #define JTAG_ID_PARTNO_SHIFT 12
23 #define JTAG_ID_PARTNO_MASK (0xffff << 12)
24
25 struct soc_ti_k3_plat {
26 const char *family;
27 const char *revision;
28 };
29
get_family_string(u32 idreg)30 static const char *get_family_string(u32 idreg)
31 {
32 const char *family;
33 u32 soc;
34
35 soc = (idreg & JTAG_ID_PARTNO_MASK) >> JTAG_ID_PARTNO_SHIFT;
36
37 switch (soc) {
38 case AM65X:
39 family = "AM65X";
40 break;
41 case J721E:
42 family = "J721E";
43 break;
44 case J7200:
45 family = "J7200";
46 break;
47 default:
48 family = "Unknown Silicon";
49 };
50
51 return family;
52 }
53
get_rev_string(u32 idreg)54 static const char *get_rev_string(u32 idreg)
55 {
56 const char *revision;
57 u32 rev;
58
59 rev = (idreg & JTAG_ID_VARIANT_MASK) >> JTAG_ID_VARIANT_SHIFT;
60
61 switch (rev) {
62 case REV_SR1_0:
63 revision = "1.0";
64 break;
65 case REV_SR2_0:
66 revision = "2.0";
67 break;
68 default:
69 revision = "Unknown Revision";
70 };
71
72 return revision;
73 }
74
soc_ti_k3_get_family(struct udevice * dev,char * buf,int size)75 static int soc_ti_k3_get_family(struct udevice *dev, char *buf, int size)
76 {
77 struct soc_ti_k3_plat *plat = dev_get_plat(dev);
78
79 snprintf(buf, size, "%s", plat->family);
80
81 return 0;
82 }
83
soc_ti_k3_get_revision(struct udevice * dev,char * buf,int size)84 static int soc_ti_k3_get_revision(struct udevice *dev, char *buf, int size)
85 {
86 struct soc_ti_k3_plat *plat = dev_get_plat(dev);
87
88 snprintf(buf, size, "SR%s", plat->revision);
89
90 return 0;
91 }
92
93 static const struct soc_ops soc_ti_k3_ops = {
94 .get_family = soc_ti_k3_get_family,
95 .get_revision = soc_ti_k3_get_revision,
96 };
97
soc_ti_k3_probe(struct udevice * dev)98 int soc_ti_k3_probe(struct udevice *dev)
99 {
100 struct soc_ti_k3_plat *plat = dev_get_plat(dev);
101 u32 idreg;
102 void *idreg_addr;
103
104 idreg_addr = dev_read_addr_ptr(dev);
105 if (!idreg_addr)
106 return -EINVAL;
107
108 idreg = readl(idreg_addr);
109
110 plat->family = get_family_string(idreg);
111 plat->revision = get_rev_string(idreg);
112
113 return 0;
114 }
115
116 static const struct udevice_id soc_ti_k3_ids[] = {
117 { .compatible = "ti,am654-chipid" },
118 { }
119 };
120
121 U_BOOT_DRIVER(soc_ti_k3) = {
122 .name = "soc_ti_k3",
123 .id = UCLASS_SOC,
124 .ops = &soc_ti_k3_ops,
125 .of_match = soc_ti_k3_ids,
126 .probe = soc_ti_k3_probe,
127 .plat_auto = sizeof(struct soc_ti_k3_plat),
128 };
129