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/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 #define OMAP_DIE_ID_0           0xfffe1800
  22 #define OMAP_DIE_ID_1           0xfffe1804
  23 #define OMAP_PRODUCTION_ID_0    0xfffe2000
  24 #define OMAP_PRODUCTION_ID_1    0xfffe2004
  25 #define OMAP32_ID_0             0xfffed400
  26 #define OMAP32_ID_1             0xfffed404
  27
  28 struct omap_id {
  29         u16     jtag_id;        /* Used to determine OMAP type */
  30         u8      die_rev;        /* Processor revision */
  31         u32     omap_id;        /* OMAP revision */
  32         u32     type;           /* Cpu id bits [31:08], cpu class bits [07:00] */
  33 };
  34
  35 /* Register values to detect the OMAP version */
  36 static struct omap_id omap_ids[] __initdata = {
  37         { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  38         { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  39         { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  40         { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  41         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  42         { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  43         { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  44         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  45         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  46         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  47         { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  48         { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  49         { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  50         { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  51         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  52         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  53         { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  54         { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  55         { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  56 };
  57
  58 /*
  59  * Get OMAP type from PROD_ID.
  60  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  61  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  62  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  63  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  64  * processors.
  65  */
  66 static u16 __init omap_get_jtag_id(void)
  67 {
  68         u32 prod_id, omap_id;
  69
  70         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  71         omap_id = omap_readl(OMAP32_ID_1);
  72
  73         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
  74         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  75                 prod_id = 0;
  76         else
  77                 prod_id &= 0xffff;
  78
  79         if (prod_id)
  80                 return prod_id;
  81
  82         /* Use OMAP32_ID_1 as fallback */
  83         prod_id = ((omap_id >> 12) & 0xffff);
  84
  85         return prod_id;
  86 }
  87
  88 /*
  89  * Get OMAP revision from DIE_REV.
  90  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
  91  * Undocumented register in the TEST BLOCK is used as fallback.
  92  * REVISIT: This does not seem to work on 1510
  93  */
  94 static u8 __init omap_get_die_rev(void)
  95 {
  96         u32 die_rev;
  97
  98         die_rev = omap_readl(OMAP_DIE_ID_1);
  99
 100         /* Check for broken OMAP_DIE_ID on early 1710 */
 101         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 102                 die_rev = 0;
 103
 104         die_rev = (die_rev >> 17) & 0xf;
 105         if (die_rev)
 106                 return die_rev;
 107
 108         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 109
 110         return die_rev;
 111 }
 112
 113 void __init omap_check_revision(void)
 114 {
 115         int i;
 116         u16 jtag_id;
 117         u8 die_rev;
 118         u32 omap_id;
 119         u8 cpu_type;
 120
 121         jtag_id = omap_get_jtag_id();
 122         die_rev = omap_get_die_rev();
 123         omap_id = omap_readl(OMAP32_ID_0);
 124
 125 #ifdef DEBUG
 126         printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 127         printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 128                 omap_readl(OMAP_DIE_ID_1),
 129                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 130         printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
 131         printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 132                 omap_readl(OMAP_PRODUCTION_ID_1),
 133                 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 134         printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 135         printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 136         printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 137 #endif
 138
 139         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 140         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 141
 142         /* First check only the major version in a safe way */
 143         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 144                 if (jtag_id == (omap_ids[i].jtag_id)) {
 145                         system_rev = omap_ids[i].type;
 146                         break;
 147                 }
 148         }
 149
 150         /* Check if we can find the die revision */
 151         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 152                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 153                         system_rev = omap_ids[i].type;
 154                         break;
 155                 }
 156         }
 157
 158         /* Finally check also the omap_id */
 159         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 160                 if (jtag_id == omap_ids[i].jtag_id
 161                     && die_rev == omap_ids[i].die_rev
 162                     && omap_id == omap_ids[i].omap_id) {
 163                         system_rev = omap_ids[i].type;
 164                         break;
 165                 }
 166         }
 167
 168         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 169         cpu_type = system_rev >> 24;
 170
 171         switch (cpu_type) {
 172         case 0x07:
 173                 system_rev |= 0x07;
 174                 break;
 175         case 0x03:
 176         case 0x15:
 177                 system_rev |= 0x15;
 178                 break;
 179         case 0x16:
 180         case 0x17:
 181                 system_rev |= 0x16;
 182                 break;
 183         case 0x24:
 184                 system_rev |= 0x24;
 185                 break;
 186         default:
 187                 printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 188         }
 189
 190         printk("OMAP%04x", system_rev >> 16);
 191         if ((system_rev >> 8) & 0xff)
 192                 printk("%x", (system_rev >> 8) & 0xff);
 193         printk(" revision %i handled as %02xxx id: %08x%08x\n",
 194                die_rev, system_rev & 0xff, system_serial_low,
 195                system_serial_high);
 196 }
 197