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 <asm/system_info.h>
  19
  20 #include "soc.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         WARN_ON_ONCE(!omap_revision || omap_revision == -1);
  69         return omap_revision;
  70 }
  71 EXPORT_SYMBOL(omap_rev);
  72
  73 /*
  74  * Get OMAP type from PROD_ID.
  75  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  76  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  77  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  78  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  79  * processors.
  80  */
  81 static u16 __init omap_get_jtag_id(void)
  82 {
  83         u32 prod_id, omap_id;
  84
  85         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  86         omap_id = omap_readl(OMAP32_ID_1);
  87
  88         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
  89         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  90                 prod_id = 0;
  91         else
  92                 prod_id &= 0xffff;
  93
  94         if (prod_id)
  95                 return prod_id;
  96
  97         /* Use OMAP32_ID_1 as fallback */
  98         prod_id = ((omap_id >> 12) & 0xffff);
  99
 100         return prod_id;
 101 }
 102
 103 /*
 104  * Get OMAP revision from DIE_REV.
 105  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
 106  * Undocumented register in the TEST BLOCK is used as fallback.
 107  * REVISIT: This does not seem to work on 1510
 108  */
 109 static u8 __init omap_get_die_rev(void)
 110 {
 111         u32 die_rev;
 112
 113         die_rev = omap_readl(OMAP_DIE_ID_1);
 114
 115         /* Check for broken OMAP_DIE_ID on early 1710 */
 116         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 117                 die_rev = 0;
 118
 119         die_rev = (die_rev >> 17) & 0xf;
 120         if (die_rev)
 121                 return die_rev;
 122
 123         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 124
 125         return die_rev;
 126 }
 127
 128 void __init omap_check_revision(void)
 129 {
 130         int i;
 131         u16 jtag_id;
 132         u8 die_rev;
 133         u32 omap_id;
 134         u8 cpu_type;
 135
 136         jtag_id = omap_get_jtag_id();
 137         die_rev = omap_get_die_rev();
 138         omap_id = omap_readl(OMAP32_ID_0);
 139
 140 #ifdef DEBUG
 141         printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 142         printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 143                 omap_readl(OMAP_DIE_ID_1),
 144                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 145         printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
 146                 omap_readl(OMAP_PRODUCTION_ID_0));
 147         printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 148                 omap_readl(OMAP_PRODUCTION_ID_1),
 149                 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 150         printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 151         printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 152         printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 153 #endif
 154
 155         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 156         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 157
 158         /* First check only the major version in a safe way */
 159         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 160                 if (jtag_id == (omap_ids[i].jtag_id)) {
 161                         omap_revision = omap_ids[i].type;
 162                         break;
 163                 }
 164         }
 165
 166         /* Check if we can find the die revision */
 167         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 168                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 169                         omap_revision = omap_ids[i].type;
 170                         break;
 171                 }
 172         }
 173
 174         /* Finally check also the omap_id */
 175         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 176                 if (jtag_id == omap_ids[i].jtag_id
 177                     && die_rev == omap_ids[i].die_rev
 178                     && omap_id == omap_ids[i].omap_id) {
 179                         omap_revision = omap_ids[i].type;
 180                         break;
 181                 }
 182         }
 183
 184         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 185         cpu_type = omap_revision >> 24;
 186
 187         switch (cpu_type) {
 188         case 0x07:
 189         case 0x08:
 190                 omap_revision |= 0x07;
 191                 break;
 192         case 0x03:
 193         case 0x15:
 194                 omap_revision |= 0x15;
 195                 break;
 196         case 0x16:
 197         case 0x17:
 198                 omap_revision |= 0x16;
 199                 break;
 200         default:
 201                 printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 202         }
 203
 204         printk(KERN_INFO "OMAP%04x", omap_revision >> 16);
 205         if ((omap_revision >> 8) & 0xff)
 206                 printk(KERN_INFO "%x", (omap_revision >> 8) & 0xff);
 207         printk(KERN_INFO " revision %i handled as %02xxx id: %08x%08x\n",
 208                die_rev, omap_revision & 0xff, system_serial_low,
 209                system_serial_high);
 210 }
 211