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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 <[email protected]>
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/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/io.h>
18 #include <asm/system_info.h>
19 
20 #include <plat/cpu.h>
21 
22 #include <mach/hardware.h>
23 
24 #include "common.h"
25 
26 #define OMAP_DIE_ID_0 0xfffe1800
27 #define OMAP_DIE_ID_1 0xfffe1804
28 #define OMAP_PRODUCTION_ID_0 0xfffe2000
29 #define OMAP_PRODUCTION_ID_1 0xfffe2004
30 #define OMAP32_ID_0 0xfffed400
31 #define OMAP32_ID_1 0xfffed404
32 
33 struct omap_id {
34  u16 jtag_id; /* Used to determine OMAP type */
35  u8 die_rev; /* Processor revision */
36  u32 omap_id; /* OMAP revision */
37  u32 type; /* Cpu id bits [31:08], cpu class bits [07:00] */
38 };
39 
40 static unsigned int omap_revision;
41 
42 /* Register values to detect the OMAP version */
43 static struct omap_id omap_ids[] __initdata = {
44  { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
45  { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
46  { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
47  { .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
48  { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
49  { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
50  { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
51  { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
52  { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
53  { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
54  { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
55  { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
56  { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
57  { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
58  { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
59  { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
60  { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
61  { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
62  { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
63  { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
64 };
65 
66 unsigned int omap_rev(void)
67 {
68  return omap_revision;
69 }
70 EXPORT_SYMBOL(omap_rev);
71 
72 /*
73  * Get OMAP type from PROD_ID.
74  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
75  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
76  * Undocumented register in TEST BLOCK is used as fallback; This seems to
77  * work on 1510, 1610 & 1710. The official way hopefully will work in future
78  * processors.
79  */
80 static u16 __init omap_get_jtag_id(void)
81 {
82  u32 prod_id, omap_id;
83 
84  prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
85  omap_id = omap_readl(OMAP32_ID_1);
86 
87  /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
88  if (((prod_id >> 20) == 0) || (prod_id == omap_id))
89  prod_id = 0;
90  else
91  prod_id &= 0xffff;
92 
93  if (prod_id)
94  return prod_id;
95 
96  /* Use OMAP32_ID_1 as fallback */
97  prod_id = ((omap_id >> 12) & 0xffff);
98 
99  return prod_id;
100 }
101 
102 /*
103  * Get OMAP revision from DIE_REV.
104  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
105  * Undocumented register in the TEST BLOCK is used as fallback.
106  * REVISIT: This does not seem to work on 1510
107  */
108 static u8 __init omap_get_die_rev(void)
109 {
110  u32 die_rev;
111 
112  die_rev = omap_readl(OMAP_DIE_ID_1);
113 
114  /* Check for broken OMAP_DIE_ID on early 1710 */
115  if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
116  die_rev = 0;
117 
118  die_rev = (die_rev >> 17) & 0xf;
119  if (die_rev)
120  return die_rev;
121 
122  die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
123 
124  return die_rev;
125 }
126 
127 void __init omap_check_revision(void)
128 {
129  int i;
130  u16 jtag_id;
131  u8 die_rev;
132  u32 omap_id;
133  u8 cpu_type;
134 
135  jtag_id = omap_get_jtag_id();
136  die_rev = omap_get_die_rev();
137  omap_id = omap_readl(OMAP32_ID_0);
138 
139 #ifdef DEBUG
140  printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
141  printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
142  omap_readl(OMAP_DIE_ID_1),
143  (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
144  printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
145  omap_readl(OMAP_PRODUCTION_ID_0));
146  printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
147  omap_readl(OMAP_PRODUCTION_ID_1),
148  omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
149  printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
150  printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
151  printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
152 #endif
153 
154  system_serial_high = omap_readl(OMAP_DIE_ID_0);
155  system_serial_low = omap_readl(OMAP_DIE_ID_1);
156 
157  /* First check only the major version in a safe way */
158  for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
159  if (jtag_id == (omap_ids[i].jtag_id)) {
160  omap_revision = omap_ids[i].type;
161  break;
162  }
163  }
164 
165  /* Check if we can find the die revision */
166  for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
167  if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
168  omap_revision = omap_ids[i].type;
169  break;
170  }
171  }
172 
173  /* Finally check also the omap_id */
174  for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
175  if (jtag_id == omap_ids[i].jtag_id
176  && die_rev == omap_ids[i].die_rev
177  && omap_id == omap_ids[i].omap_id) {
178  omap_revision = omap_ids[i].type;
179  break;
180  }
181  }
182 
183  /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
184  cpu_type = omap_revision >> 24;
185 
186  switch (cpu_type) {
187  case 0x07:
188  case 0x08:
189  omap_revision |= 0x07;
190  break;
191  case 0x03:
192  case 0x15:
193  omap_revision |= 0x15;
194  break;
195  case 0x16:
196  case 0x17:
197  omap_revision |= 0x16;
198  break;
199  default:
200  printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
201  }
202 
203  printk(KERN_INFO "OMAP%04x", omap_revision >> 16);
204  if ((omap_revision >> 8) & 0xff)
205  printk(KERN_INFO "%x", (omap_revision >> 8) & 0xff);
206  printk(KERN_INFO " revision %i handled as %02xxx id: %08x%08x\n",
207  die_rev, omap_revision & 0xff, system_serial_low,
208  system_serial_high);
209 }
210 
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