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/export.h>
  19 #include <linux/init.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 EXPORT_SYMBOL_GPL(periph_rev);
  38 unsigned int zbbus_mhz;
  39 EXPORT_SYMBOL(zbbus_mhz);
  40
  41 static char *soc_str;
  42 static char *pass_str;
  43 static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */
  44
  45 static int __init setup_bcm1250(void)
  46 {
  47         int ret = 0;
  48
  49         switch (soc_pass) {
  50         case K_SYS_REVISION_BCM1250_PASS1:
  51                 periph_rev = 1;
  52                 pass_str = "Pass 1";
  53                 break;
  54         case K_SYS_REVISION_BCM1250_A10:
  55                 periph_rev = 2;
  56                 pass_str = "A8/A10";
  57                 /* XXXKW different war_pass? */
  58                 war_pass = K_SYS_REVISION_BCM1250_PASS2;
  59                 break;
  60         case K_SYS_REVISION_BCM1250_PASS2_2:
  61                 periph_rev = 2;
  62                 pass_str = "B1";
  63                 break;
  64         case K_SYS_REVISION_BCM1250_B2:
  65                 periph_rev = 2;
  66                 pass_str = "B2";
  67                 war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
  68                 break;
  69         case K_SYS_REVISION_BCM1250_PASS3:
  70                 periph_rev = 3;
  71                 pass_str = "C0";
  72                 break;
  73         case K_SYS_REVISION_BCM1250_C1:
  74                 periph_rev = 3;
  75                 pass_str = "C1";
  76                 break;
  77         default:
  78                 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
  79                         periph_rev = 2;
  80                         pass_str = "A0-A6";
  81                         war_pass = K_SYS_REVISION_BCM1250_PASS2;
  82                 } else {
  83                         printk("Unknown BCM1250 rev %x\n", soc_pass);
  84                         ret = 1;
  85                 }
  86                 break;
  87         }
  88
  89         return ret;
  90 }
  91
  92 int sb1250_m3_workaround_needed(void)
  93 {
  94         switch (soc_type) {
  95         case K_SYS_SOC_TYPE_BCM1250:
  96         case K_SYS_SOC_TYPE_BCM1250_ALT:
  97         case K_SYS_SOC_TYPE_BCM1250_ALT2:
  98         case K_SYS_SOC_TYPE_BCM1125:
  99         case K_SYS_SOC_TYPE_BCM1125H:
 100                 return soc_pass < K_SYS_REVISION_BCM1250_C0;
 101
 102         default:
 103                 return 0;
 104         }
 105 }
 106
 107 static int __init setup_bcm112x(void)
 108 {
 109         int ret = 0;
 110
 111         switch (soc_pass) {
 112         case 0:
 113                 /* Early build didn't have revid set */
 114                 periph_rev = 3;
 115                 pass_str = "A1";
 116                 war_pass = K_SYS_REVISION_BCM112x_A1;
 117                 break;
 118         case K_SYS_REVISION_BCM112x_A1:
 119                 periph_rev = 3;
 120                 pass_str = "A1";
 121                 break;
 122         case K_SYS_REVISION_BCM112x_A2:
 123                 periph_rev = 3;
 124                 pass_str = "A2";
 125                 break;
 126         case K_SYS_REVISION_BCM112x_A3:
 127                 periph_rev = 3;
 128                 pass_str = "A3";
 129                 break;
 130         case K_SYS_REVISION_BCM112x_A4:
 131                 periph_rev = 3;
 132                 pass_str = "A4";
 133                 break;
 134         case K_SYS_REVISION_BCM112x_B0:
 135                 periph_rev = 3;
 136                 pass_str = "B0";
 137                 break;
 138         default:
 139                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
 140                 ret = 1;
 141         }
 142
 143         return ret;
 144 }
 145
 146 /* Setup code likely to be common to all SiByte platforms */
 147
 148 static int __init sys_rev_decode(void)
 149 {
 150         int ret = 0;
 151
 152         war_pass = soc_pass;
 153         switch (soc_type) {
 154         case K_SYS_SOC_TYPE_BCM1250:
 155         case K_SYS_SOC_TYPE_BCM1250_ALT:
 156         case K_SYS_SOC_TYPE_BCM1250_ALT2:
 157                 soc_str = "BCM1250";
 158                 ret = setup_bcm1250();
 159                 break;
 160         case K_SYS_SOC_TYPE_BCM1120:
 161                 soc_str = "BCM1120";
 162                 ret = setup_bcm112x();
 163                 break;
 164         case K_SYS_SOC_TYPE_BCM1125:
 165                 soc_str = "BCM1125";
 166                 ret = setup_bcm112x();
 167                 break;
 168         case K_SYS_SOC_TYPE_BCM1125H:
 169                 soc_str = "BCM1125H";
 170                 ret = setup_bcm112x();
 171                 break;
 172         default:
 173                 printk("Unknown SOC type %x\n", soc_type);
 174                 ret = 1;
 175                 break;
 176         }
 177
 178         return ret;
 179 }
 180
 181 void __init sb1250_setup(void)
 182 {
 183         uint64_t sys_rev;
 184         int plldiv;
 185         int bad_config = 0;
 186
 187         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 188         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 189         soc_type = SYS_SOC_TYPE(sys_rev);
 190         soc_pass = G_SYS_REVISION(sys_rev);
 191
 192         if (sys_rev_decode()) {
 193                 printk("Restart after failure to identify SiByte chip\n");
 194                 machine_restart(NULL);
 195         }
 196
 197         plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 198         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 199
 200         printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
 201                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 202         printk("Board type: %s\n", get_system_type());
 203
 204         switch (war_pass) {
 205         case K_SYS_REVISION_BCM1250_PASS1:
 206                 printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
 207                             "and the kernel doesn't have the proper "
 208                             "workarounds compiled in. @@@@\n");
 209                 bad_config = 1;
 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) || \
 234     !defined(CONFIG_CPU_HAS_PREFETCH)
 235                 printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
 236                             "conservatively configured for an 'A' stepping. "
 237                             "@@@@\n");
 238 #endif
 239                 break;
 240         default:
 241                 break;
 242         }
 243         if (bad_config) {
 244                 printk("Invalid configuration for this chip.\n");
 245                 machine_restart(NULL);
 246         }
 247 }