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/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 OMAP24XX_TAP_BASE       io_p2v(0x48014000)
  22
  23 #define OMAP_TAP_IDCODE         0x0204
  24 #define OMAP_TAP_PROD_ID        0x0208
  25
  26 #define OMAP_TAP_DIE_ID_0       0x0218
  27 #define OMAP_TAP_DIE_ID_1       0x021C
  28 #define OMAP_TAP_DIE_ID_2       0x0220
  29 #define OMAP_TAP_DIE_ID_3       0x0224
  30
  31 /* system_rev fields for OMAP2 processors:
  32  *   CPU id bits     [31:16],
  33  *   CPU device type [15:12], (unprg,normal,POP)
  34  *   CPU revision    [11:08]
  35  *   CPU class bits  [07:00]
  36  */
  37
  38 struct omap_id {
  39         u16     hawkeye;        /* Silicon type (Hawkeye id) */
  40         u8      dev;            /* Device type from production_id reg */
  41         u32     type;           /* combined type id copied to system_rev */
  42 };
  43
  44 /* Register values to detect the OMAP version */
  45 static struct omap_id omap_ids[] __initdata = {
  46         { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
  47         { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
  48         { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
  49         { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
  50         { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
  51         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
  52 };
  53
  54 static u32 __init read_tap_reg(int reg)
  55 {
  56         return __raw_readl(OMAP24XX_TAP_BASE + reg);
  57 }
  58
  59 void __init omap2_check_revision(void)
  60 {
  61         int i, j;
  62         u32 idcode;
  63         u32 prod_id;
  64         u16 hawkeye;
  65         u8  dev_type;
  66         u8  rev;
  67
  68         idcode = read_tap_reg(OMAP_TAP_IDCODE);
  69         prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
  70         hawkeye = (idcode >> 12) & 0xffff;
  71         rev = (idcode >> 28) & 0x0f;
  72         dev_type = (prod_id >> 16) & 0x0f;
  73
  74 #ifdef DEBUG
  75         printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
  76                 idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
  77         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
  78                 read_tap_reg(OMAP_TAP_DIE_ID_0));
  79         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
  80                 read_tap_reg(OMAP_TAP_DIE_ID_1),
  81                (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
  82         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
  83                 read_tap_reg(OMAP_TAP_DIE_ID_2));
  84         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
  85                 read_tap_reg(OMAP_TAP_DIE_ID_3));
  86         printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
  87                 prod_id, dev_type);
  88 #endif
  89
  90         /* Check hawkeye ids */
  91         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  92                 if (hawkeye == omap_ids[i].hawkeye)
  93                         break;
  94         }
  95
  96         if (i == ARRAY_SIZE(omap_ids)) {
  97                 printk(KERN_ERR "Unknown OMAP CPU id\n");
  98                 return;
  99         }
 100
 101         for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
 102                 if (dev_type == omap_ids[j].dev)
 103                         break;
 104         }
 105
 106         if (j == ARRAY_SIZE(omap_ids)) {
 107                 printk(KERN_ERR "Unknown OMAP device type. "
 108                                 "Handling it as OMAP%04x\n",
 109                                 omap_ids[i].type >> 16);
 110                 j = i;
 111         }
 112         system_rev = omap_ids[j].type;
 113
 114         system_rev |= rev << 8;
 115
 116         /* Add the cpu class info (24xx) */
 117         system_rev |= 0x24;
 118
 119         pr_info("OMAP%04x", system_rev >> 16);
 120         if ((system_rev >> 8) & 0x0f)
 121                 printk("%x", (system_rev >> 8) & 0x0f);
 122         printk("\n");
 123 }
 124