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