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-rw-r--r--arch/arm/mach-omap1/id.c188
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diff --git a/arch/arm/mach-omap1/id.c b/arch/arm/mach-omap1/id.c
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1/*
2 * linux/arch/arm/mach-omap1/id.c
3 *
4 * OMAP1 CPU identification code
5 *
6 * Copyright (C) 2004 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/config.h>
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/init.h>
18
19#include <asm/io.h>
20
21struct omap_id {
22 u16 jtag_id; /* Used to determine OMAP type */
23 u8 die_rev; /* Processor revision */
24 u32 omap_id; /* OMAP revision */
25 u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */
26};
27
28/* Register values to detect the OMAP version */
29static struct omap_id omap_ids[] __initdata = {
30 { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
31 { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
32 { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
33 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
34 { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
35 { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
36 { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
37 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
38 { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
39 { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
40 { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
41 { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
42 { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
43 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
44 { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
45 { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
46 { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
47 { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
48};
49
50/*
51 * Get OMAP type from PROD_ID.
52 * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
53 * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
54 * Undocumented register in TEST BLOCK is used as fallback; This seems to
55 * work on 1510, 1610 & 1710. The official way hopefully will work in future
56 * processors.
57 */
58static u16 __init omap_get_jtag_id(void)
59{
60 u32 prod_id, omap_id;
61
62 prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
63 omap_id = omap_readl(OMAP32_ID_1);
64
65 /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
66 if (((prod_id >> 20) == 0) || (prod_id == omap_id))
67 prod_id = 0;
68 else
69 prod_id &= 0xffff;
70
71 if (prod_id)
72 return prod_id;
73
74 /* Use OMAP32_ID_1 as fallback */
75 prod_id = ((omap_id >> 12) & 0xffff);
76
77 return prod_id;
78}
79
80/*
81 * Get OMAP revision from DIE_REV.
82 * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
83 * Undocumented register in the TEST BLOCK is used as fallback.
84 * REVISIT: This does not seem to work on 1510
85 */
86static u8 __init omap_get_die_rev(void)
87{
88 u32 die_rev;
89
90 die_rev = omap_readl(OMAP_DIE_ID_1);
91
92 /* Check for broken OMAP_DIE_ID on early 1710 */
93 if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
94 die_rev = 0;
95
96 die_rev = (die_rev >> 17) & 0xf;
97 if (die_rev)
98 return die_rev;
99
100 die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
101
102 return die_rev;
103}
104
105void __init omap_check_revision(void)
106{
107 int i;
108 u16 jtag_id;
109 u8 die_rev;
110 u32 omap_id;
111 u8 cpu_type;
112
113 jtag_id = omap_get_jtag_id();
114 die_rev = omap_get_die_rev();
115 omap_id = omap_readl(OMAP32_ID_0);
116
117#ifdef DEBUG
118 printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
119 printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
120 omap_readl(OMAP_DIE_ID_1),
121 (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
122 printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
123 printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
124 omap_readl(OMAP_PRODUCTION_ID_1),
125 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
126 printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
127 printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
128 printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
129#endif
130
131 system_serial_high = omap_readl(OMAP_DIE_ID_0);
132 system_serial_low = omap_readl(OMAP_DIE_ID_1);
133
134 /* First check only the major version in a safe way */
135 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
136 if (jtag_id == (omap_ids[i].jtag_id)) {
137 system_rev = omap_ids[i].type;
138 break;
139 }
140 }
141
142 /* Check if we can find the die revision */
143 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
144 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
145 system_rev = omap_ids[i].type;
146 break;
147 }
148 }
149
150 /* Finally check also the omap_id */
151 for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
152 if (jtag_id == omap_ids[i].jtag_id
153 && die_rev == omap_ids[i].die_rev
154 && omap_id == omap_ids[i].omap_id) {
155 system_rev = omap_ids[i].type;
156 break;
157 }
158 }
159
160 /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
161 cpu_type = system_rev >> 24;
162
163 switch (cpu_type) {
164 case 0x07:
165 system_rev |= 0x07;
166 break;
167 case 0x15:
168 system_rev |= 0x15;
169 break;
170 case 0x16:
171 case 0x17:
172 system_rev |= 0x16;
173 break;
174 case 0x24:
175 system_rev |= 0x24;
176 break;
177 default:
178 printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
179 }
180
181 printk("OMAP%04x", system_rev >> 16);
182 if ((system_rev >> 8) & 0xff)
183 printk("%x", (system_rev >> 8) & 0xff);
184 printk(" revision %i handled as %02xxx id: %08x%08x\n",
185 die_rev, system_rev & 0xff, system_serial_low,
186 system_serial_high);
187}
188
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-02 22:01:07 -0500