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