release/src-rt-6.x.4708/linux/linux-2.6.36/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/mipsregs.h>
  26 #include <asm/io.h>
  27 #include <asm/sibyte/sb1250.h>
  28 #include <asm/sibyte/sb1250_regs.h>
  29 #include <asm/sibyte/sb1250_scd.h>
  30
  31 unsigned int sb1_pass;
  32 unsigned int soc_pass;
  33 unsigned int soc_type;
  34 EXPORT_SYMBOL(soc_type);
  35 unsigned int periph_rev;
  36 unsigned int zbbus_mhz;
  37 EXPORT_SYMBOL(zbbus_mhz);
  38
  39 static char *soc_str;
  40 static char *pass_str;
  41 static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */
  42
  43 static int __init setup_bcm1250(void)
  44 {
  45         int ret = 0;
  46
  47         switch (soc_pass) {
  48         case K_SYS_REVISION_BCM1250_PASS1:
  49                 periph_rev = 1;
  50                 pass_str = "Pass 1";
  51                 break;
  52         case K_SYS_REVISION_BCM1250_A10:
  53                 periph_rev = 2;
  54                 pass_str = "A8/A10";
  55                 /* XXXKW different war_pass? */
  56                 war_pass = K_SYS_REVISION_BCM1250_PASS2;
  57                 break;
  58         case K_SYS_REVISION_BCM1250_PASS2_2:
  59                 periph_rev = 2;
  60                 pass_str = "B1";
  61                 break;
  62         case K_SYS_REVISION_BCM1250_B2:
  63                 periph_rev = 2;
  64                 pass_str = "B2";
  65                 war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
  66                 break;
  67         case K_SYS_REVISION_BCM1250_PASS3:
  68                 periph_rev = 3;
  69                 pass_str = "C0";
  70                 break;
  71         case K_SYS_REVISION_BCM1250_C1:
  72                 periph_rev = 3;
  73                 pass_str = "C1";
  74                 break;
  75         default:
  76                 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
  77                         periph_rev = 2;
  78                         pass_str = "A0-A6";
  79                         war_pass = K_SYS_REVISION_BCM1250_PASS2;
  80                 } else {
  81                         printk("Unknown BCM1250 rev %x\n", soc_pass);
  82                         ret = 1;
  83                 }
  84                 break;
  85         }
  86
  87         return ret;
  88 }
  89
  90 int sb1250_m3_workaround_needed(void)
  91 {
  92         switch (soc_type) {
  93         case K_SYS_SOC_TYPE_BCM1250:
  94         case K_SYS_SOC_TYPE_BCM1250_ALT:
  95         case K_SYS_SOC_TYPE_BCM1250_ALT2:
  96         case K_SYS_SOC_TYPE_BCM1125:
  97         case K_SYS_SOC_TYPE_BCM1125H:
  98                 return soc_pass < K_SYS_REVISION_BCM1250_C0;
  99
 100         default:
 101                 return 0;
 102         }
 103 }
 104
 105 static int __init setup_bcm112x(void)
 106 {
 107         int ret = 0;
 108
 109         switch (soc_pass) {
 110         case 0:
 111                 /* Early build didn't have revid set */
 112                 periph_rev = 3;
 113                 pass_str = "A1";
 114                 war_pass = K_SYS_REVISION_BCM112x_A1;
 115                 break;
 116         case K_SYS_REVISION_BCM112x_A1:
 117                 periph_rev = 3;
 118                 pass_str = "A1";
 119                 break;
 120         case K_SYS_REVISION_BCM112x_A2:
 121                 periph_rev = 3;
 122                 pass_str = "A2";
 123                 break;
 124         case K_SYS_REVISION_BCM112x_A3:
 125                 periph_rev = 3;
 126                 pass_str = "A3";
 127                 break;
 128         case K_SYS_REVISION_BCM112x_A4:
 129                 periph_rev = 3;
 130                 pass_str = "A4";
 131                 break;
 132         case K_SYS_REVISION_BCM112x_B0:
 133                 periph_rev = 3;
 134                 pass_str = "B0";
 135                 break;
 136         default:
 137                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
 138                 ret = 1;
 139         }
 140
 141         return ret;
 142 }
 143
 144 /* Setup code likely to be common to all SiByte platforms */
 145
 146 static int __init sys_rev_decode(void)
 147 {
 148         int ret = 0;
 149
 150         war_pass = soc_pass;
 151         switch (soc_type) {
 152         case K_SYS_SOC_TYPE_BCM1250:
 153         case K_SYS_SOC_TYPE_BCM1250_ALT:
 154         case K_SYS_SOC_TYPE_BCM1250_ALT2:
 155                 soc_str = "BCM1250";
 156                 ret = setup_bcm1250();
 157                 break;
 158         case K_SYS_SOC_TYPE_BCM1120:
 159                 soc_str = "BCM1120";
 160                 ret = setup_bcm112x();
 161                 break;
 162         case K_SYS_SOC_TYPE_BCM1125:
 163                 soc_str = "BCM1125";
 164                 ret = setup_bcm112x();
 165                 break;
 166         case K_SYS_SOC_TYPE_BCM1125H:
 167                 soc_str = "BCM1125H";
 168                 ret = setup_bcm112x();
 169                 break;
 170         default:
 171                 printk("Unknown SOC type %x\n", soc_type);
 172                 ret = 1;
 173                 break;
 174         }
 175
 176         return ret;
 177 }
 178
 179 void __init sb1250_setup(void)
 180 {
 181         uint64_t sys_rev;
 182         int plldiv;
 183         int bad_config = 0;
 184
 185         sb1_pass = read_c0_prid() & 0xff;
 186         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 187         soc_type = SYS_SOC_TYPE(sys_rev);
 188         soc_pass = G_SYS_REVISION(sys_rev);
 189
 190         if (sys_rev_decode()) {
 191                 printk("Restart after failure to identify SiByte chip\n");
 192                 machine_restart(NULL);
 193         }
 194
 195         plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 196         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 197
 198         printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
 199                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 200         printk("Board type: %s\n", get_system_type());
 201
 202         switch (war_pass) {
 203         case K_SYS_REVISION_BCM1250_PASS1:
 204 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
 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 #endif
 210                 break;
 211         case K_SYS_REVISION_BCM1250_PASS2:
 212                 /* Pass 2 - easiest as default for now - so many numbers */
 213 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
 214         !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
 215                 printk("@@@@ This is a BCM1250 A3-A10 board, and the "
 216                             "kernel doesn't have the proper workarounds "
 217                             "compiled in. @@@@\n");
 218                 bad_config = 1;
 219 #endif
 220 #ifdef CONFIG_CPU_HAS_PREFETCH
 221                 printk("@@@@ Prefetches may be enabled in this kernel, "
 222                             "but are buggy on this board.  @@@@\n");
 223                 bad_config = 1;
 224 #endif
 225                 break;
 226         case K_SYS_REVISION_BCM1250_PASS2_2:
 227 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
 228                 printk("@@@@ This is a BCM1250 B1/B2. board, and the "
 229                             "kernel doesn't have the proper workarounds "
 230                             "compiled in. @@@@\n");
 231                 bad_config = 1;
 232 #endif
 233 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || !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 }