cpu/arm926ejs/cpuinfo.c

   1 /*
   2  * OMAP1 CPU identification code
   3  *
   4  * Copyright (C) 2004 Nokia Corporation
   5  * Written by Tony Lindgren <tony@atomide.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <common.h>
  13 #include <command.h>
  14 #include <arm926ejs.h>
  15
  16 #if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP)
  17
  18 #define omap_readw(x)           *(volatile unsigned short *)(x)
  19 #define omap_readl(x)           *(volatile unsigned long *)(x)
  20
  21 #define OMAP_DIE_ID_0           0xfffe1800
  22 #define OMAP_DIE_ID_1           0xfffe1804
  23 #define OMAP_PRODUCTION_ID_0    0xfffe2000
  24 #define OMAP_PRODUCTION_ID_1    0xfffe2004
  25 #define OMAP32_ID_0             0xfffed400
  26 #define OMAP32_ID_1             0xfffed404
  27
  28 struct omap_id {
  29         u16     jtag_id;        /* Used to determine OMAP type */
  30         u8      die_rev;        /* Processor revision */
  31         u32     omap_id;        /* OMAP revision */
  32         u32     type;           /* Cpu id bits [31:08], cpu class bits [07:00] */
  33 };
  34
  35 /* Register values to detect the OMAP version */
  36 static struct omap_id omap_ids[] = {
  37         { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  38         { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  39         { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  40         { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  41         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  42         { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  43         { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  44         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  45         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  46         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  47         { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  48         { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  49         { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  50         { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  51         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  52         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  53         { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  54         { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  55         { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  56 };
  57
  58 /*
  59  * Get OMAP type from PROD_ID.
  60  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  61  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  62  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  63  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  64  * processors.
  65  */
  66 static u16 omap_get_jtag_id(void)
  67 {
  68         u32 prod_id, omap_id;
  69
  70         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  71         omap_id = omap_readl(OMAP32_ID_1);
  72
  73         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
  74         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  75                 prod_id = 0;
  76         else
  77                 prod_id &= 0xffff;
  78
  79         if (prod_id)
  80                 return prod_id;
  81
  82         /* Use OMAP32_ID_1 as fallback */
  83         prod_id = ((omap_id >> 12) & 0xffff);
  84
  85         return prod_id;
  86 }
  87
  88 /*
  89  * Get OMAP revision from DIE_REV.
  90  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
  91  * Undocumented register in the TEST BLOCK is used as fallback.
  92  * REVISIT: This does not seem to work on 1510
  93  */
  94 static u8 omap_get_die_rev(void)
  95 {
  96         u32 die_rev;
  97
  98         die_rev = omap_readl(OMAP_DIE_ID_1);
  99
 100         /* Check for broken OMAP_DIE_ID on early 1710 */
 101         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 102                 die_rev = 0;
 103
 104         die_rev = (die_rev >> 17) & 0xf;
 105         if (die_rev)
 106                 return die_rev;
 107
 108         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 109
 110         return die_rev;
 111 }
 112
 113 static unsigned long dpll1(void)
 114 {
 115         unsigned short pll_ctl_val = omap_readw(DPLL_CTL_REG);
 116         unsigned long rate;
 117
 118         rate = CONFIG_SYS_CLK_FREQ; /* Base xtal rate */
 119         if (pll_ctl_val & 0x10) {
 120                 /* PLL enabled, apply multiplier and divisor */
 121                 if (pll_ctl_val & 0xf80)
 122                         rate *= (pll_ctl_val & 0xf80) >> 7;
 123                 rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 124         } else {
 125                 /* PLL disabled, apply bypass divisor */
 126                 switch (pll_ctl_val & 0xc) {
 127                 case 0:
 128                         break;
 129                 case 0x4:
 130                         rate /= 2;
 131                         break;
 132                 default:
 133                         rate /= 4;
 134                         break;
 135                 }
 136         }
 137
 138         return rate;
 139 }
 140
 141 static unsigned long armcore(void)
 142 {
 143         unsigned short arm_ckctl = omap_readw(ARM_CKCTL);
 144
 145         return (dpll1() >> ((arm_ckctl & 0x0030) >> 4));
 146 }
 147
 148 int print_cpuinfo (void)
 149 {
 150         int i;
 151         u16 jtag_id;
 152         u8 die_rev;
 153         u32 omap_id;
 154         u8 cpu_type;
 155         u32 system_serial_high;
 156         u32 system_serial_low;
 157         u32 system_rev = 0;
 158
 159         jtag_id = omap_get_jtag_id();
 160         die_rev = omap_get_die_rev();
 161         omap_id = omap_readl(OMAP32_ID_0);
 162
 163 #ifdef DEBUG
 164         printf("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 165         printf("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 166                omap_readl(OMAP_DIE_ID_1),
 167                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 168         printf("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
 169         printf("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 170                omap_readl(OMAP_PRODUCTION_ID_1),
 171                omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 172         printf("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 173         printf("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 174         printf("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 175 #endif
 176
 177         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 178         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 179
 180         /* First check only the major version in a safe way */
 181         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 182                 if (jtag_id == (omap_ids[i].jtag_id)) {
 183                         system_rev = omap_ids[i].type;
 184                         break;
 185                 }
 186         }
 187
 188         /* Check if we can find the die revision */
 189         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 190                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 191                         system_rev = omap_ids[i].type;
 192                         break;
 193                 }
 194         }
 195
 196         /* Finally check also the omap_id */
 197         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 198                 if (jtag_id == omap_ids[i].jtag_id
 199                     && die_rev == omap_ids[i].die_rev
 200                     && omap_id == omap_ids[i].omap_id) {
 201                         system_rev = omap_ids[i].type;
 202                         break;
 203                 }
 204         }
 205
 206         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 207         cpu_type = system_rev >> 24;
 208
 209         switch (cpu_type) {
 210         case 0x07:
 211                 system_rev |= 0x07;
 212                 break;
 213         case 0x03:
 214         case 0x15:
 215                 system_rev |= 0x15;
 216                 break;
 217         case 0x16:
 218         case 0x17:
 219                 system_rev |= 0x16;
 220                 break;
 221         case 0x24:
 222                 system_rev |= 0x24;
 223                 break;
 224         default:
 225                 printf("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 226         }
 227
 228         printf("CPU:   OMAP%04x", system_rev >> 16);
 229         if ((system_rev >> 8) & 0xff)
 230                 printf("%x", (system_rev >> 8) & 0xff);
 231 #ifdef DEBUG
 232         printf(" revision %i handled as %02xxx id: %08x%08x",
 233                die_rev, system_rev & 0xff, system_serial_low, system_serial_high);
 234 #endif
 235         printf(" at %ld.%01ld MHz (DPLL1=%ld.%01ld MHz)\n",
 236                armcore() / 1000000, (armcore() / 100000) % 10,
 237                dpll1() / 1000000, (dpll1() / 100000) % 10);
 238
 239         return 0;
 240 }
 241
 242 #endif /* #if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP) */