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 ARRAY_SIZE(x)           (sizeof(x) / sizeof((x)[0]))
  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 /* Register values to detect the OMAP version */
  38 static struct omap_id omap_ids[] = {
  39         { .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
  40         { .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
  41         { .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
  42         { .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
  43         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
  44         { .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
  45         { .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
  46         { .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
  47         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  48         { .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
  49         { .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
  50         { .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
  51         { .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
  52         { .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
  53         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
  54         { .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
  55         { .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
  56         { .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
  57         { .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
  58 };
  59
  60 /*
  61  * Get OMAP type from PROD_ID.
  62  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
  63  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
  64  * Undocumented register in TEST BLOCK is used as fallback; This seems to
  65  * work on 1510, 1610 & 1710. The official way hopefully will work in future
  66  * processors.
  67  */
  68 static u16 omap_get_jtag_id(void)
  69 {
  70         u32 prod_id, omap_id;
  71
  72         prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
  73         omap_id = omap_readl(OMAP32_ID_1);
  74
  75         /* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
  76         if (((prod_id >> 20) == 0) || (prod_id == omap_id))
  77                 prod_id = 0;
  78         else
  79                 prod_id &= 0xffff;
  80
  81         if (prod_id)
  82                 return prod_id;
  83
  84         /* Use OMAP32_ID_1 as fallback */
  85         prod_id = ((omap_id >> 12) & 0xffff);
  86
  87         return prod_id;
  88 }
  89
  90 /*
  91  * Get OMAP revision from DIE_REV.
  92  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
  93  * Undocumented register in the TEST BLOCK is used as fallback.
  94  * REVISIT: This does not seem to work on 1510
  95  */
  96 static u8 omap_get_die_rev(void)
  97 {
  98         u32 die_rev;
  99
 100         die_rev = omap_readl(OMAP_DIE_ID_1);
 101
 102         /* Check for broken OMAP_DIE_ID on early 1710 */
 103         if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
 104                 die_rev = 0;
 105
 106         die_rev = (die_rev >> 17) & 0xf;
 107         if (die_rev)
 108                 return die_rev;
 109
 110         die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
 111
 112         return die_rev;
 113 }
 114
 115 static unsigned long dpll1(void)
 116 {
 117         unsigned short pll_ctl_val = omap_readw(DPLL_CTL_REG);
 118         unsigned long rate;
 119
 120         rate = CONFIG_SYS_CLK_FREQ; /* Base xtal rate */
 121         if (pll_ctl_val & 0x10) {
 122                 /* PLL enabled, apply multiplier and divisor */
 123                 if (pll_ctl_val & 0xf80)
 124                         rate *= (pll_ctl_val & 0xf80) >> 7;
 125                 rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
 126         } else {
 127                 /* PLL disabled, apply bypass divisor */
 128                 switch (pll_ctl_val & 0xc) {
 129                 case 0:
 130                         break;
 131                 case 0x4:
 132                         rate /= 2;
 133                         break;
 134                 default:
 135                         rate /= 4;
 136                         break;
 137                 }
 138         }
 139
 140         return rate;
 141 }
 142
 143 static unsigned long armcore(void)
 144 {
 145         unsigned short arm_ckctl = omap_readw(ARM_CKCTL);
 146
 147         return (dpll1() >> ((arm_ckctl & 0x0030) >> 4));
 148 }
 149
 150 int print_cpuinfo (void)
 151 {
 152         int i;
 153         u16 jtag_id;
 154         u8 die_rev;
 155         u32 omap_id;
 156         u8 cpu_type;
 157         u32 system_serial_high;
 158         u32 system_serial_low;
 159         u32 system_rev = 0;
 160
 161         jtag_id = omap_get_jtag_id();
 162         die_rev = omap_get_die_rev();
 163         omap_id = omap_readl(OMAP32_ID_0);
 164
 165 #ifdef DEBUG
 166         printf("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
 167         printf("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
 168                omap_readl(OMAP_DIE_ID_1),
 169                (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
 170         printf("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
 171         printf("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
 172                omap_readl(OMAP_PRODUCTION_ID_1),
 173                omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
 174         printf("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
 175         printf("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
 176         printf("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
 177 #endif
 178
 179         system_serial_high = omap_readl(OMAP_DIE_ID_0);
 180         system_serial_low = omap_readl(OMAP_DIE_ID_1);
 181
 182         /* First check only the major version in a safe way */
 183         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 184                 if (jtag_id == (omap_ids[i].jtag_id)) {
 185                         system_rev = omap_ids[i].type;
 186                         break;
 187                 }
 188         }
 189
 190         /* Check if we can find the die revision */
 191         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 192                 if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
 193                         system_rev = omap_ids[i].type;
 194                         break;
 195                 }
 196         }
 197
 198         /* Finally check also the omap_id */
 199         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
 200                 if (jtag_id == omap_ids[i].jtag_id
 201                     && die_rev == omap_ids[i].die_rev
 202                     && omap_id == omap_ids[i].omap_id) {
 203                         system_rev = omap_ids[i].type;
 204                         break;
 205                 }
 206         }
 207
 208         /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
 209         cpu_type = system_rev >> 24;
 210
 211         switch (cpu_type) {
 212         case 0x07:
 213                 system_rev |= 0x07;
 214                 break;
 215         case 0x03:
 216         case 0x15:
 217                 system_rev |= 0x15;
 218                 break;
 219         case 0x16:
 220         case 0x17:
 221                 system_rev |= 0x16;
 222                 break;
 223         case 0x24:
 224                 system_rev |= 0x24;
 225                 break;
 226         default:
 227                 printf("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
 228         }
 229
 230         printf("CPU:   OMAP%04x", system_rev >> 16);
 231         if ((system_rev >> 8) & 0xff)
 232                 printf("%x", (system_rev >> 8) & 0xff);
 233 #ifdef DEBUG
 234         printf(" revision %i handled as %02xxx id: %08x%08x",
 235                die_rev, system_rev & 0xff, system_serial_low, system_serial_high);
 236 #endif
 237         printf(" at %ld.%01ld MHz (DPLL1=%ld.%01ld MHz)\n",
 238                armcore() / 1000000, (armcore() / 100000) % 10,
 239                dpll1() / 1000000, (dpll1() / 100000) % 10);
 240
 241         return 0;
 242 }
 243
 244 #endif /* #if defined(CONFIG_DISPLAY_CPUINFO) && defined(CONFIG_OMAP) */