arch/arm/mach-omap1/id.c

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