arch/arm/mach-omap2/id.c

   1 /*
   2  * linux/arch/arm/mach-omap2/id.c
   3  *
   4  * OMAP2 CPU identification code
   5  *
   6  * Copyright (C) 2005 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
  18 #include <asm/io.h>
  19
  20 #define OMAP24XX_TAP_BASE       io_p2v(0x48014000)
  21
  22 #define OMAP_TAP_IDCODE         0x0204
  23 #define OMAP_TAP_PROD_ID        0x0208
  24
  25 #define OMAP_TAP_DIE_ID_0       0x0218
  26 #define OMAP_TAP_DIE_ID_1       0x021C
  27 #define OMAP_TAP_DIE_ID_2       0x0220
  28 #define OMAP_TAP_DIE_ID_3       0x0224
  29
  30 /* system_rev fields for OMAP2 processors:
  31  *   CPU id bits     [31:16],
  32  *   CPU device type [15:12], (unprg,normal,POP)
  33  *   CPU revision    [11:08]
  34  *   CPU class bits  [07:00]
  35  */
  36
  37 struct omap_id {
  38         u16     hawkeye;        /* Silicon type (Hawkeye id) */
  39         u8      dev;            /* Device type from production_id reg */
  40         u32     type;           /* combined type id copied to system_rev */
  41 };
  42
  43 /* Register values to detect the OMAP version */
  44 static struct omap_id omap_ids[] __initdata = {
  45         { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
  46         { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
  47         { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
  48         { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
  49         { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
  50         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
  51 };
  52
  53 static u32 __init read_tap_reg(int reg)
  54 {
  55         return __raw_readl(OMAP24XX_TAP_BASE + reg);
  56 }
  57
  58 void __init omap2_check_revision(void)
  59 {
  60         int i, j;
  61         u32 idcode;
  62         u32 prod_id;
  63         u16 hawkeye;
  64         u8  dev_type;
  65         u8  rev;
  66
  67         idcode = read_tap_reg(OMAP_TAP_IDCODE);
  68         prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
  69         hawkeye = (idcode >> 12) & 0xffff;
  70         rev = (idcode >> 28) & 0x0f;
  71         dev_type = (prod_id >> 16) & 0x0f;
  72
  73 #ifdef DEBUG
  74         printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
  75                 idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
  76         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
  77                 read_tap_reg(OMAP_TAP_DIE_ID_0));
  78         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
  79                 read_tap_reg(OMAP_TAP_DIE_ID_1),
  80                (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
  81         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
  82                 read_tap_reg(OMAP_TAP_DIE_ID_2));
  83         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
  84                 read_tap_reg(OMAP_TAP_DIE_ID_3));
  85         printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
  86                 prod_id, dev_type);
  87 #endif
  88
  89         /* Check hawkeye ids */
  90         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  91                 if (hawkeye == omap_ids[i].hawkeye)
  92                         break;
  93         }
  94
  95         if (i == ARRAY_SIZE(omap_ids)) {
  96                 printk(KERN_ERR "Unknown OMAP CPU id\n");
  97                 return;
  98         }
  99
 100         for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
 101                 if (dev_type == omap_ids[j].dev)
 102                         break;
 103         }
 104
 105         if (j == ARRAY_SIZE(omap_ids)) {
 106                 printk(KERN_ERR "Unknown OMAP device type. "
 107                                 "Handling it as OMAP%04x\n",
 108                                 omap_ids[i].type >> 16);
 109                 j = i;
 110         }
 111         system_rev = omap_ids[j].type;
 112
 113         system_rev |= rev << 8;
 114
 115         /* Add the cpu class info (24xx) */
 116         system_rev |= 0x24;
 117
 118         pr_info("OMAP%04x", system_rev >> 16);
 119         if ((system_rev >> 8) & 0x0f)
 120                 printk("%x", (system_rev >> 8) & 0x0f);
 121         printk("\n");
 122 }
 123