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/kernel.h>
  20 #include <linux/reboot.h>
  21 #include <linux/string.h>
  22
  23 #include <asm/bootinfo.h>
  24 #include <asm/mipsregs.h>
  25 #include <asm/io.h>
  26 #include <asm/sibyte/sb1250.h>
  27 #include <asm/sibyte/sb1250_regs.h>
  28 #include <asm/sibyte/sb1250_scd.h>
  29
  30 unsigned int sb1_pass;
  31 unsigned int soc_pass;
  32 unsigned int soc_type;
  33 unsigned int periph_rev;
  34 unsigned int zbbus_mhz;
  35
  36 static char *soc_str;
  37 static char *pass_str;
  38 static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */
  39
  40 static inline int setup_bcm1250(void);
  41 static inline int setup_bcm112x(void);
  42
  43 /* Setup code likely to be common to all SiByte platforms */
  44
  45 static inline int sys_rev_decode(void)
  46 {
  47         int ret = 0;
  48
  49         war_pass = soc_pass;
  50         switch (soc_type) {
  51         case K_SYS_SOC_TYPE_BCM1250:
  52         case K_SYS_SOC_TYPE_BCM1250_ALT:
  53         case K_SYS_SOC_TYPE_BCM1250_ALT2:
  54                 soc_str = "BCM1250";
  55                 ret = setup_bcm1250();
  56                 break;
  57         case K_SYS_SOC_TYPE_BCM1120:
  58                 soc_str = "BCM1120";
  59                 ret = setup_bcm112x();
  60                 break;
  61         case K_SYS_SOC_TYPE_BCM1125:
  62                 soc_str = "BCM1125";
  63                 ret = setup_bcm112x();
  64                 break;
  65         case K_SYS_SOC_TYPE_BCM1125H:
  66                 soc_str = "BCM1125H";
  67                 ret = setup_bcm112x();
  68                 break;
  69         default:
  70                 prom_printf("Unknown SOC type %x\n", soc_type);
  71                 ret = 1;
  72                 break;
  73         }
  74         return ret;
  75 }
  76
  77 static inline int setup_bcm1250(void)
  78 {
  79         int ret = 0;
  80
  81         switch (soc_pass) {
  82         case K_SYS_REVISION_BCM1250_PASS1:
  83                 periph_rev = 1;
  84                 pass_str = "Pass 1";
  85                 break;
  86         case K_SYS_REVISION_BCM1250_A10:
  87                 periph_rev = 2;
  88                 pass_str = "A8/A10";
  89                 /* XXXKW different war_pass? */
  90                 war_pass = K_SYS_REVISION_BCM1250_PASS2;
  91                 break;
  92         case K_SYS_REVISION_BCM1250_PASS2_2:
  93                 periph_rev = 2;
  94                 pass_str = "B1";
  95                 break;
  96         case K_SYS_REVISION_BCM1250_B2:
  97                 periph_rev = 2;
  98                 pass_str = "B2";
  99                 war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
 100                 break;
 101         case K_SYS_REVISION_BCM1250_PASS3:
 102                 periph_rev = 3;
 103                 pass_str = "C0";
 104                 break;
 105         case K_SYS_REVISION_BCM1250_C1:
 106                 periph_rev = 3;
 107                 pass_str = "C1";
 108                 break;
 109         default:
 110                 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
 111                         periph_rev = 2;
 112                         pass_str = "A0-A6";
 113                         war_pass = K_SYS_REVISION_BCM1250_PASS2;
 114                 } else {
 115                         prom_printf("Unknown BCM1250 rev %x\n", soc_pass);
 116                         ret = 1;
 117                 }
 118                 break;
 119         }
 120         return ret;
 121 }
 122
 123 static inline int setup_bcm112x(void)
 124 {
 125         int ret = 0;
 126
 127         switch (soc_pass) {
 128         case 0:
 129                 /* Early build didn't have revid set */
 130                 periph_rev = 3;
 131                 pass_str = "A1";
 132                 war_pass = K_SYS_REVISION_BCM112x_A1;
 133                 break;
 134         case K_SYS_REVISION_BCM112x_A1:
 135                 periph_rev = 3;
 136                 pass_str = "A1";
 137                 break;
 138         case K_SYS_REVISION_BCM112x_A2:
 139                 periph_rev = 3;
 140                 pass_str = "A2";
 141                 break;
 142         default:
 143                 prom_printf("Unknown %s rev %x\n", soc_str, soc_pass);
 144                 ret = 1;
 145         }
 146         return ret;
 147 }
 148
 149 void sb1250_setup(void)
 150 {
 151         uint64_t sys_rev;
 152         int plldiv;
 153         int bad_config = 0;
 154
 155         sb1_pass = read_c0_prid() & 0xff;
 156         sys_rev = bus_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 157         soc_type = SYS_SOC_TYPE(sys_rev);
 158         soc_pass = G_SYS_REVISION(sys_rev);
 159
 160         if (sys_rev_decode()) {
 161                 prom_printf("Restart after failure to identify SiByte chip\n");
 162                 machine_restart(NULL);
 163         }
 164
 165         plldiv = G_SYS_PLL_DIV(bus_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 166         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 167
 168         prom_printf("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
 169                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 170         prom_printf("Board type: %s\n", get_system_type());
 171
 172         switch(war_pass) {
 173         case K_SYS_REVISION_BCM1250_PASS1:
 174 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
 175                 prom_printf("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, and the kernel doesn't have the proper workarounds compiled in. @@@@\n");
 176                 bad_config = 1;
 177 #endif
 178                 break;
 179         case K_SYS_REVISION_BCM1250_PASS2:
 180                 /* Pass 2 - easiest as default for now - so many numbers */
 181 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
 182                 prom_printf("@@@@ This is a BCM1250 A3-A10 board, and the kernel doesn't have the proper workarounds compiled in. @@@@\n");
 183                 bad_config = 1;
 184 #endif
 185 #ifdef CONFIG_CPU_HAS_PREFETCH
 186                 prom_printf("@@@@ Prefetches may be enabled in this kernel, but are buggy on this board.  @@@@\n");
 187                 bad_config = 1;
 188 #endif
 189                 break;
 190         case K_SYS_REVISION_BCM1250_PASS2_2:
 191 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
 192                 prom_printf("@@@@ This is a BCM1250 B1/B2. board, and the kernel doesn't have the proper workarounds compiled in. @@@@\n");
 193                 bad_config = 1;
 194 #endif
 195 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || !defined(CONFIG_CPU_HAS_PREFETCH)
 196                 prom_printf("@@@@ This is a BCM1250 B1/B2, but the kernel is conservatively configured for an 'A' stepping. @@@@\n");
 197 #endif
 198                 break;
 199         default:
 200                 break;
 201         }
 202         if (bad_config) {
 203                 prom_printf("Invalid configuration for this chip.\n");
 204                 machine_restart(NULL);
 205         }
 206 }