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