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