1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/arch/arm/mach-omap1/id.c
4 *
5 * OMAP1 CPU identification code
6 *
7 * Copyright (C) 2004 Nokia Corporation
8 * Written by Tony Lindgren <tony@atomide.com>
9 */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <asm/system_info.h>
16
17 #include "soc.h"
18
19 #include <mach/hardware.h>
20
21 #include "common.h"
22
23 #define OMAP_DIE_ID_0 0xfffe1800
24 #define OMAP_DIE_ID_1 0xfffe1804
25 #define OMAP_PRODUCTION_ID_0 0xfffe2000
26 #define OMAP_PRODUCTION_ID_1 0xfffe2004
27 #define OMAP32_ID_0 0xfffed400
28 #define OMAP32_ID_1 0xfffed404
29
30 struct omap_id {
31 u16 jtag_id; /* Used to determine OMAP type */
32 u8 die_rev; /* Processor revision */
33 u32 omap_id; /* OMAP revision */
34 u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */
35 };
36
37 static unsigned int omap_revision;
38
39 /* Register values to detect the OMAP version */
40 static struct omap_id omap_ids[] __initdata = {
41 { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
42 { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
43 { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
44 { .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
45 { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
46 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
47 { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
48 { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
49 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
50 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
51 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
52 { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
53 { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
54 { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
55 { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
56 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
57 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
58 { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
59 { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
60 { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
61 };
62
omap_rev(void)63 unsigned int omap_rev(void)
64 {
65 return omap_revision;
66 }
67 EXPORT_SYMBOL(omap_rev);
68
69 /*
70 * Get OMAP type from PROD_ID.
71 * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
72 * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
73 * Undocumented register in TEST BLOCK is used as fallback; This seems to
74 * work on 1510, 1610 & 1710. The official way hopefully will work in future
75 * processors.
76 */
omap_get_jtag_id(void)77 static u16 __init omap_get_jtag_id(void)
78 {
79 u32 prod_id, omap_id;
80
81 prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
82 omap_id = omap_readl(OMAP32_ID_1);
83
84 /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
85 if (((prod_id >> 20) == 0) || (prod_id == omap_id))
86 prod_id = 0;
87 else
88 prod_id &= 0xffff;
89
90 if (prod_id)
91 return prod_id;
92
93 /* Use OMAP32_ID_1 as fallback */
94 prod_id = ((omap_id >> 12) & 0xffff);
95
96 return prod_id;
97 }
98
99 /*
100 * Get OMAP revision from DIE_REV.
101 * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
102 * Undocumented register in the TEST BLOCK is used as fallback.
103 * REVISIT: This does not seem to work on 1510
104 */
omap_get_die_rev(void)105 static u8 __init omap_get_die_rev(void)
106 {
107 u32 die_rev;
108
109 die_rev = omap_readl(OMAP_DIE_ID_1);
110
111 /* Check for broken OMAP_DIE_ID on early 1710 */
112 if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
113 die_rev = 0;
114
115 die_rev = (die_rev >> 17) & 0xf;
116 if (die_rev)
117 return die_rev;
118
119 die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
120
121 return die_rev;
122 }
123
omap_check_revision(void)124 void __init omap_check_revision(void)
125 {
126 int i;
127 u16 jtag_id;
128 u8 die_rev;
129 u32 omap_id;
130 u8 cpu_type;
131
132 jtag_id = omap_get_jtag_id();
133 die_rev = omap_get_die_rev();
134 omap_id = omap_readl(OMAP32_ID_0);
135
136 #ifdef DEBUG
137 printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
138 printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
139 omap_readl(OMAP_DIE_ID_1),
140 (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
141 printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
142 omap_readl(OMAP_PRODUCTION_ID_0));
143 printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
144 omap_readl(OMAP_PRODUCTION_ID_1),
145 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
146 printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
147 printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
148 printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
149 #endif
150
151 system_serial_high = omap_readl(OMAP_DIE_ID_0);
152 system_serial_low = omap_readl(OMAP_DIE_ID_1);
153
154 /* First check only the major version in a safe way */
155 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
156 if (jtag_id == (omap_ids[i].jtag_id)) {
157 omap_revision = omap_ids[i].type;
158 break;
159 }
160 }
161
162 /* Check if we can find the die revision */
163 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
164 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
165 omap_revision = omap_ids[i].type;
166 break;
167 }
168 }
169
170 /* Finally check also the omap_id */
171 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
172 if (jtag_id == omap_ids[i].jtag_id
173 && die_rev == omap_ids[i].die_rev
174 && omap_id == omap_ids[i].omap_id) {
175 omap_revision = omap_ids[i].type;
176 break;
177 }
178 }
179
180 /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
181 cpu_type = omap_revision >> 24;
182
183 switch (cpu_type) {
184 case 0x07:
185 case 0x08:
186 omap_revision |= 0x07;
187 break;
188 case 0x03:
189 case 0x15:
190 omap_revision |= 0x15;
191 break;
192 case 0x16:
193 case 0x17:
194 omap_revision |= 0x16;
195 break;
196 default:
197 printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
198 }
199
200 pr_info("OMAP%04x", omap_revision >> 16);
201 if ((omap_revision >> 8) & 0xff)
202 pr_cont("%x", (omap_revision >> 8) & 0xff);
203 pr_cont(" revision %i handled as %02xxx id: %08x%08x\n",
204 die_rev, omap_revision & 0xff, system_serial_low,
205 system_serial_high);
206 }
207
208