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 #if defined(CONFIG_ARCH_OMAP2420)
  21 #define OMAP24XX_TAP_BASE       io_p2v(0x48014000)
  22 #endif
  23
  24 #if defined(CONFIG_ARCH_OMAP2430)
  25 #define OMAP24XX_TAP_BASE       io_p2v(0x4900A000)
  26 #endif
  27
  28 #define OMAP_TAP_IDCODE         0x0204
  29 #define OMAP_TAP_PROD_ID        0x0208
  30
  31 #define OMAP_TAP_DIE_ID_0       0x0218
  32 #define OMAP_TAP_DIE_ID_1       0x021C
  33 #define OMAP_TAP_DIE_ID_2       0x0220
  34 #define OMAP_TAP_DIE_ID_3       0x0224
  35
  36 /* system_rev fields for OMAP2 processors:
  37  *   CPU id bits     [31:16],
  38  *   CPU device type [15:12], (unprg,normal,POP)
  39  *   CPU revision    [11:08]
  40  *   CPU class bits  [07:00]
  41  */
  42
  43 struct omap_id {
  44         u16     hawkeye;        /* Silicon type (Hawkeye id) */
  45         u8      dev;            /* Device type from production_id reg */
  46         u32     type;           /* combined type id copied to system_rev */
  47 };
  48
  49 /* Register values to detect the OMAP version */
  50 static struct omap_id omap_ids[] __initdata = {
  51         { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
  52         { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
  53         { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
  54         { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
  55         { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
  56         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
  57 };
  58
  59 static u32 __init read_tap_reg(int reg)
  60 {
  61         return __raw_readl(OMAP24XX_TAP_BASE + reg);
  62 }
  63
  64 void __init omap2_check_revision(void)
  65 {
  66         int i, j;
  67         u32 idcode;
  68         u32 prod_id;
  69         u16 hawkeye;
  70         u8  dev_type;
  71         u8  rev;
  72
  73         idcode = read_tap_reg(OMAP_TAP_IDCODE);
  74         prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
  75         hawkeye = (idcode >> 12) & 0xffff;
  76         rev = (idcode >> 28) & 0x0f;
  77         dev_type = (prod_id >> 16) & 0x0f;
  78
  79 #ifdef DEBUG
  80         printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
  81                 idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
  82         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
  83                 read_tap_reg(OMAP_TAP_DIE_ID_0));
  84         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
  85                 read_tap_reg(OMAP_TAP_DIE_ID_1),
  86                (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
  87         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
  88                 read_tap_reg(OMAP_TAP_DIE_ID_2));
  89         printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
  90                 read_tap_reg(OMAP_TAP_DIE_ID_3));
  91         printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
  92                 prod_id, dev_type);
  93 #endif
  94
  95         /* Check hawkeye ids */
  96         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
  97                 if (hawkeye == omap_ids[i].hawkeye)
  98                         break;
  99         }
 100
 101         if (i == ARRAY_SIZE(omap_ids)) {
 102                 printk(KERN_ERR "Unknown OMAP CPU id\n");
 103                 return;
 104         }
 105
 106         for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
 107                 if (dev_type == omap_ids[j].dev)
 108                         break;
 109         }
 110
 111         if (j == ARRAY_SIZE(omap_ids)) {
 112                 printk(KERN_ERR "Unknown OMAP device type. "
 113                                 "Handling it as OMAP%04x\n",
 114                                 omap_ids[i].type >> 16);
 115                 j = i;
 116         }
 117         system_rev = omap_ids[j].type;
 118
 119         system_rev |= rev << 8;
 120
 121         /* Add the cpu class info (24xx) */
 122         system_rev |= 0x24;
 123
 124         pr_info("OMAP%04x", system_rev >> 16);
 125         if ((system_rev >> 8) & 0x0f)
 126                 printk("%x", (system_rev >> 8) & 0x0f);
 127         printk("\n");
 128 }
 129