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