arch/arm/mach-omap1/id.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-omap1/id.c
   4  *
   5  * OMAP1 CPU identification code
   6  *
   7  * Copyright (C) 2004 Nokia Corporation
   8  * Written by Tony Lindgren <tony@atomide.com>
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <asm/system_info.h>
  16
  17 #include "soc.h"
  18
  19 #include <mach/hardware.h>
  20
  21 #include "common.h"
  22
  23 #define OMAP_DIE_ID_0           0xfffe1800
  24 #define OMAP_DIE_ID_1           0xfffe1804
  25 #define OMAP_PRODUCTION_ID_0    0xfffe2000
  26 #define OMAP_PRODUCTION_ID_1    0xfffe2004
  27 #define OMAP32_ID_0             0xfffed400
  28 #define OMAP32_ID_1             0xfffed404
  29
  30 struct omap_id {
  31         u16     jtag_id;        /* Used to determine OMAP type */
  32         u8      die_rev;        /* Processor revision */
  33         u32     omap_id;        /* OMAP revision */
  34         u32     type;           /* Cpu id bits [31:08], cpu class bits [07:00] */
  35 };
  36
  37 static unsigned int omap_revision;
  38
  39 /* Register values to detect the OMAP version */
  40 static struct omap_id omap_ids[] __initdata = {
  41         { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  42         { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  43         { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  44         { .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
  45         { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  46         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  47         { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  48         { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  49         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  50         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  51         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  52         { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  53         { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  54         { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  55         { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  56         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  57         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  58         { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  59         { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  60         { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  61 };
  62
  63 unsigned int omap_rev(void)
  64 {
  65         return omap_revision;
  66 }
  67 EXPORT_SYMBOL(omap_rev);
  68
  69 /*
  70  * Get OMAP type from PROD_ID.
  71  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  72  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  73  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  74  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  75  * processors.
  76  */
  77 static u16 __init omap_get_jtag_id(void)
  78 {
  79         u32 prod_id, omap_id;
  80
  81         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  82         omap_id = omap_readl(OMAP32_ID_1);
  83
  84         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
  85         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  86                 prod_id = 0;
  87         else
  88                 prod_id &= 0xffff;
  89
  90         if (prod_id)
  91                 return prod_id;
  92
  93         /* Use OMAP32_ID_1 as fallback */
  94         prod_id = ((omap_id >> 12) & 0xffff);
  95
  96         return prod_id;
  97 }
  98
  99 /*
 100  * Get OMAP revision from DIE_REV.
 101  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
 102  * Undocumented register in the TEST BLOCK is used as fallback.
 103  * REVISIT: This does not seem to work on 1510
 104  */
 105 static u8 __init omap_get_die_rev(void)
 106 {
 107         u32 die_rev;
 108
 109         die_rev = omap_readl(OMAP_DIE_ID_1);
 110
 111         /* Check for broken OMAP_DIE_ID on early 1710 */
 112         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 113                 die_rev = 0;
 114
 115         die_rev = (die_rev >> 17) & 0xf;
 116         if (die_rev)
 117                 return die_rev;
 118
 119         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 120
 121         return die_rev;
 122 }
 123
 124 void __init omap_check_revision(void)
 125 {
 126         int i;
 127         u16 jtag_id;
 128         u8 die_rev;
 129         u32 omap_id;
 130         u8 cpu_type;
 131
 132         jtag_id = omap_get_jtag_id();
 133         die_rev = omap_get_die_rev();
 134         omap_id = omap_readl(OMAP32_ID_0);
 135
 136 #ifdef DEBUG
 137         printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 138         printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 139                 omap_readl(OMAP_DIE_ID_1),
 140                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 141         printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
 142                 omap_readl(OMAP_PRODUCTION_ID_0));
 143         printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 144                 omap_readl(OMAP_PRODUCTION_ID_1),
 145                 omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 146         printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 147         printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 148         printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 149 #endif
 150
 151         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 152         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 153
 154         /* First check only the major version in a safe way */
 155         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 156                 if (jtag_id == (omap_ids[i].jtag_id)) {
 157                         omap_revision = omap_ids[i].type;
 158                         break;
 159                 }
 160         }
 161
 162         /* Check if we can find the die revision */
 163         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 164                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 165                         omap_revision = omap_ids[i].type;
 166                         break;
 167                 }
 168         }
 169
 170         /* Finally check also the omap_id */
 171         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 172                 if (jtag_id == omap_ids[i].jtag_id
 173                     && die_rev == omap_ids[i].die_rev
 174                     && omap_id == omap_ids[i].omap_id) {
 175                         omap_revision = omap_ids[i].type;
 176                         break;
 177                 }
 178         }
 179
 180         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 181         cpu_type = omap_revision >> 24;
 182
 183         switch (cpu_type) {
 184         case 0x07:
 185         case 0x08:
 186                 omap_revision |= 0x07;
 187                 break;
 188         case 0x03:
 189         case 0x15:
 190                 omap_revision |= 0x15;
 191                 break;
 192         case 0x16:
 193         case 0x17:
 194                 omap_revision |= 0x16;
 195                 break;
 196         default:
 197                 printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 198         }
 199
 200         pr_info("OMAP%04x", omap_revision >> 16);
 201         if ((omap_revision >> 8) & 0xff)
 202                 pr_cont("%x", (omap_revision >> 8) & 0xff);
 203         pr_cont(" revision %i handled as %02xxx id: %08x%08x\n",
 204                die_rev, omap_revision & 0xff, system_serial_low,
 205                system_serial_high);
 206 }
 207