arch/mips/sibyte/sb1250/setup.c

   1 /*
   2  * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/reboot.h>
  22 #include <linux/string.h>
  23
  24 #include <asm/bootinfo.h>
  25 #include <asm/cpu.h>
  26 #include <asm/mipsregs.h>
  27 #include <asm/io.h>
  28 #include <asm/sibyte/sb1250.h>
  29 #include <asm/sibyte/sb1250_regs.h>
  30 #include <asm/sibyte/sb1250_scd.h>
  31
  32 unsigned int sb1_pass;
  33 unsigned int soc_pass;
  34 unsigned int soc_type;
  35 EXPORT_SYMBOL(soc_type);
  36 unsigned int periph_rev;
  37 unsigned int zbbus_mhz;
  38 EXPORT_SYMBOL(zbbus_mhz);
  39
  40 static char *soc_str;
  41 static char *pass_str;
  42 static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */
  43
  44 static int __init setup_bcm1250(void)
  45 {
  46         int ret = 0;
  47
  48         switch (soc_pass) {
  49         case K_SYS_REVISION_BCM1250_PASS1:
  50                 periph_rev = 1;
  51                 pass_str = "Pass 1";
  52                 break;
  53         case K_SYS_REVISION_BCM1250_A10:
  54                 periph_rev = 2;
  55                 pass_str = "A8/A10";
  56                 /* XXXKW different war_pass? */
  57                 war_pass = K_SYS_REVISION_BCM1250_PASS2;
  58                 break;
  59         case K_SYS_REVISION_BCM1250_PASS2_2:
  60                 periph_rev = 2;
  61                 pass_str = "B1";
  62                 break;
  63         case K_SYS_REVISION_BCM1250_B2:
  64                 periph_rev = 2;
  65                 pass_str = "B2";
  66                 war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
  67                 break;
  68         case K_SYS_REVISION_BCM1250_PASS3:
  69                 periph_rev = 3;
  70                 pass_str = "C0";
  71                 break;
  72         case K_SYS_REVISION_BCM1250_C1:
  73                 periph_rev = 3;
  74                 pass_str = "C1";
  75                 break;
  76         default:
  77                 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
  78                         periph_rev = 2;
  79                         pass_str = "A0-A6";
  80                         war_pass = K_SYS_REVISION_BCM1250_PASS2;
  81                 } else {
  82                         printk("Unknown BCM1250 rev %x\n", soc_pass);
  83                         ret = 1;
  84                 }
  85                 break;
  86         }
  87
  88         return ret;
  89 }
  90
  91 int sb1250_m3_workaround_needed(void)
  92 {
  93         switch (soc_type) {
  94         case K_SYS_SOC_TYPE_BCM1250:
  95         case K_SYS_SOC_TYPE_BCM1250_ALT:
  96         case K_SYS_SOC_TYPE_BCM1250_ALT2:
  97         case K_SYS_SOC_TYPE_BCM1125:
  98         case K_SYS_SOC_TYPE_BCM1125H:
  99                 return soc_pass < K_SYS_REVISION_BCM1250_C0;
 100
 101         default:
 102                 return 0;
 103         }
 104 }
 105
 106 static int __init setup_bcm112x(void)
 107 {
 108         int ret = 0;
 109
 110         switch (soc_pass) {
 111         case 0:
 112                 /* Early build didn't have revid set */
 113                 periph_rev = 3;
 114                 pass_str = "A1";
 115                 war_pass = K_SYS_REVISION_BCM112x_A1;
 116                 break;
 117         case K_SYS_REVISION_BCM112x_A1:
 118                 periph_rev = 3;
 119                 pass_str = "A1";
 120                 break;
 121         case K_SYS_REVISION_BCM112x_A2:
 122                 periph_rev = 3;
 123                 pass_str = "A2";
 124                 break;
 125         case K_SYS_REVISION_BCM112x_A3:
 126                 periph_rev = 3;
 127                 pass_str = "A3";
 128                 break;
 129         case K_SYS_REVISION_BCM112x_A4:
 130                 periph_rev = 3;
 131                 pass_str = "A4";
 132                 break;
 133         case K_SYS_REVISION_BCM112x_B0:
 134                 periph_rev = 3;
 135                 pass_str = "B0";
 136                 break;
 137         default:
 138                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
 139                 ret = 1;
 140         }
 141
 142         return ret;
 143 }
 144
 145 /* Setup code likely to be common to all SiByte platforms */
 146
 147 static int __init sys_rev_decode(void)
 148 {
 149         int ret = 0;
 150
 151         war_pass = soc_pass;
 152         switch (soc_type) {
 153         case K_SYS_SOC_TYPE_BCM1250:
 154         case K_SYS_SOC_TYPE_BCM1250_ALT:
 155         case K_SYS_SOC_TYPE_BCM1250_ALT2:
 156                 soc_str = "BCM1250";
 157                 ret = setup_bcm1250();
 158                 break;
 159         case K_SYS_SOC_TYPE_BCM1120:
 160                 soc_str = "BCM1120";
 161                 ret = setup_bcm112x();
 162                 break;
 163         case K_SYS_SOC_TYPE_BCM1125:
 164                 soc_str = "BCM1125";
 165                 ret = setup_bcm112x();
 166                 break;
 167         case K_SYS_SOC_TYPE_BCM1125H:
 168                 soc_str = "BCM1125H";
 169                 ret = setup_bcm112x();
 170                 break;
 171         default:
 172                 printk("Unknown SOC type %x\n", soc_type);
 173                 ret = 1;
 174                 break;
 175         }
 176
 177         return ret;
 178 }
 179
 180 void __init sb1250_setup(void)
 181 {
 182         uint64_t sys_rev;
 183         int plldiv;
 184         int bad_config = 0;
 185
 186         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 187         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 188         soc_type = SYS_SOC_TYPE(sys_rev);
 189         soc_pass = G_SYS_REVISION(sys_rev);
 190
 191         if (sys_rev_decode()) {
 192                 printk("Restart after failure to identify SiByte chip\n");
 193                 machine_restart(NULL);
 194         }
 195
 196         plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 197         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 198
 199         printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
 200                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 201         printk("Board type: %s\n", get_system_type());
 202
 203         switch (war_pass) {
 204         case K_SYS_REVISION_BCM1250_PASS1:
 205                 printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
 206                             "and the kernel doesn't have the proper "
 207                             "workarounds compiled in. @@@@\n");
 208                 bad_config = 1;
 209                 break;
 210         case K_SYS_REVISION_BCM1250_PASS2:
 211                 /* Pass 2 - easiest as default for now - so many numbers */
 212 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
 213     !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
 214                 printk("@@@@ This is a BCM1250 A3-A10 board, and the "
 215                             "kernel doesn't have the proper workarounds "
 216                             "compiled in. @@@@\n");
 217                 bad_config = 1;
 218 #endif
 219 #ifdef CONFIG_CPU_HAS_PREFETCH
 220                 printk("@@@@ Prefetches may be enabled in this kernel, "
 221                             "but are buggy on this board.  @@@@\n");
 222                 bad_config = 1;
 223 #endif
 224                 break;
 225         case K_SYS_REVISION_BCM1250_PASS2_2:
 226 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
 227                 printk("@@@@ This is a BCM1250 B1/B2. board, and the "
 228                             "kernel doesn't have the proper workarounds "
 229                             "compiled in. @@@@\n");
 230                 bad_config = 1;
 231 #endif
 232 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
 233     !defined(CONFIG_CPU_HAS_PREFETCH)
 234                 printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
 235                             "conservatively configured for an 'A' stepping. "
 236                             "@@@@\n");
 237 #endif
 238                 break;
 239         default:
 240                 break;
 241         }
 242         if (bad_config) {
 243                 printk("Invalid configuration for this chip.\n");
 244                 machine_restart(NULL);
 245         }
 246 }