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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 | ||
21 | struct 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 */ | |
29 | static 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 | */ | |
58 | static 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 | */ | |
86 | static 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 | ||
105 | void __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 |