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