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

source code of linux/arch/arm/mach-omap1/id.c