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
  19 #define OMAP_DIE_ID_0           0xfffe1800
  20 #define OMAP_DIE_ID_1           0xfffe1804
  21 #define OMAP_PRODUCTION_ID_0    0xfffe2000
  22 #define OMAP_PRODUCTION_ID_1    0xfffe2004
  23 #define OMAP32_ID_0             0xfffed400
  24 #define OMAP32_ID_1             0xfffed404
  25
  26 struct omap_id {
  27         u16     jtag_id;        /* Used to determine OMAP type */
  28         u8      die_rev;        /* Processor revision */
  29         u32     omap_id;        /* OMAP revision */
  30         u32     type;           /* Cpu id bits [31:08], cpu class bits [07:00] */
  31 };
  32
  33 /* Register values to detect the OMAP version */
  34 static struct omap_id omap_ids[] __initdata = {
  35         { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  36         { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  37         { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  38         { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  39         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  40         { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  41         { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  42         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  43         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  44         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  45         { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  46         { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  47         { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  48         { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  49         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  50         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  51         { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  52         { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  53         { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  54 };
  55
  56 /*
  57  * Get OMAP type from PROD_ID.
  58  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  59  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  60  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  61  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  62  * processors.
  63  */
  64 static u16 __init omap_get_jtag_id(void)
  65 {
  66         u32 prod_id, omap_id;
  67
  68         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  69         omap_id = omap_readl(OMAP32_ID_1);
  70
  71         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
  72         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  73                 prod_id = 0;
  74         else
  75                 prod_id &= 0xffff;
  76
  77         if (prod_id)
  78                 return prod_id;
  79
  80         /* Use OMAP32_ID_1 as fallback */
  81         prod_id = ((omap_id >> 12) & 0xffff);
  82
  83         return prod_id;
  84 }
  85
  86 /*
  87  * Get OMAP revision from DIE_REV.
  88  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
  89  * Undocumented register in the TEST BLOCK is used as fallback.
  90  * REVISIT: This does not seem to work on 1510
  91  */
  92 static u8 __init omap_get_die_rev(void)
  93 {
  94         u32 die_rev;
  95
  96         die_rev = omap_readl(OMAP_DIE_ID_1);
  97
  98         /* Check for broken OMAP_DIE_ID on early 1710 */
  99         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 100                 die_rev = 0;
 101
 102         die_rev = (die_rev >> 17) & 0xf;
 103         if (die_rev)
 104                 return die_rev;
 105
 106         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 107
 108         return die_rev;
 109 }
 110
 111 void __init omap_check_revision(void)
 112 {
 113         int i;
 114         u16 jtag_id;
 115         u8 die_rev;
 116         u32 omap_id;
 117         u8 cpu_type;
 118
 119         jtag_id = omap_get_jtag_id();
 120         die_rev = omap_get_die_rev();
 121         omap_id = omap_readl(OMAP32_ID_0);
 122
 123 #ifdef DEBUG
 124         printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 125         printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 126                 omap_readl(OMAP_DIE_ID_1),
 127                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 128         printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
 129         printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 130                 omap_readl(OMAP_PRODUCTION_ID_1),
 131                 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 132         printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 133         printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 134         printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 135 #endif
 136
 137         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 138         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 139
 140         /* First check only the major version in a safe way */
 141         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 142                 if (jtag_id == (omap_ids[i].jtag_id)) {
 143                         system_rev = omap_ids[i].type;
 144                         break;
 145                 }
 146         }
 147
 148         /* Check if we can find the die revision */
 149         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 150                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 151                         system_rev = omap_ids[i].type;
 152                         break;
 153                 }
 154         }
 155
 156         /* Finally check also the omap_id */
 157         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 158                 if (jtag_id == omap_ids[i].jtag_id
 159                     && die_rev == omap_ids[i].die_rev
 160                     && omap_id == omap_ids[i].omap_id) {
 161                         system_rev = omap_ids[i].type;
 162                         break;
 163                 }
 164         }
 165
 166         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 167         cpu_type = system_rev >> 24;
 168
 169         switch (cpu_type) {
 170         case 0x07:
 171                 system_rev |= 0x07;
 172                 break;
 173         case 0x03:
 174         case 0x15:
 175                 system_rev |= 0x15;
 176                 break;
 177         case 0x16:
 178         case 0x17:
 179                 system_rev |= 0x16;
 180                 break;
 181         case 0x24:
 182                 system_rev |= 0x24;
 183                 break;
 184         default:
 185                 printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 186         }
 187
 188         printk("OMAP%04x", system_rev >> 16);
 189         if ((system_rev >> 8) & 0xff)
 190                 printk("%x", (system_rev >> 8) & 0xff);
 191         printk(" revision %i handled as %02xxx id: %08x%08x\n",
 192                die_rev, system_rev & 0xff, system_serial_low,
 193                system_serial_high);
 194 }
 195