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