arch/mips/sibyte/sb1250/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
   4  */
   5 #include <linux/export.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/reboot.h>
   9 #include <linux/string.h>
  10
  11 #include <asm/bootinfo.h>
  12 #include <asm/cpu.h>
  13 #include <asm/mipsregs.h>
  14 #include <asm/io.h>
  15 #include <asm/sibyte/sb1250.h>
  16 #include <asm/sibyte/sb1250_regs.h>
  17 #include <asm/sibyte/sb1250_scd.h>
  18
  19 unsigned int sb1_pass;
  20 unsigned int soc_pass;
  21 unsigned int soc_type;
  22 EXPORT_SYMBOL(soc_type);
  23 unsigned int periph_rev;
  24 EXPORT_SYMBOL_GPL(periph_rev);
  25 unsigned int zbbus_mhz;
  26 EXPORT_SYMBOL(zbbus_mhz);
  27
  28 static char *soc_str;
  29 static char *pass_str;
  30 static unsigned int war_pass;   /* XXXKW don't overload PASS defines? */
  31
  32 static int __init setup_bcm1250(void)
  33 {
  34         int ret = 0;
  35
  36         switch (soc_pass) {
  37         case K_SYS_REVISION_BCM1250_PASS1:
  38                 periph_rev = 1;
  39                 pass_str = "Pass 1";
  40                 break;
  41         case K_SYS_REVISION_BCM1250_A10:
  42                 periph_rev = 2;
  43                 pass_str = "A8/A10";
  44                 /* XXXKW different war_pass? */
  45                 war_pass = K_SYS_REVISION_BCM1250_PASS2;
  46                 break;
  47         case K_SYS_REVISION_BCM1250_PASS2_2:
  48                 periph_rev = 2;
  49                 pass_str = "B1";
  50                 break;
  51         case K_SYS_REVISION_BCM1250_B2:
  52                 periph_rev = 2;
  53                 pass_str = "B2";
  54                 war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
  55                 break;
  56         case K_SYS_REVISION_BCM1250_PASS3:
  57                 periph_rev = 3;
  58                 pass_str = "C0";
  59                 break;
  60         case K_SYS_REVISION_BCM1250_C1:
  61                 periph_rev = 3;
  62                 pass_str = "C1";
  63                 break;
  64         default:
  65                 if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
  66                         periph_rev = 2;
  67                         pass_str = "A0-A6";
  68                         war_pass = K_SYS_REVISION_BCM1250_PASS2;
  69                 } else {
  70                         printk("Unknown BCM1250 rev %x\n", soc_pass);
  71                         ret = 1;
  72                 }
  73                 break;
  74         }
  75
  76         return ret;
  77 }
  78
  79 int sb1250_m3_workaround_needed(void)
  80 {
  81         switch (soc_type) {
  82         case K_SYS_SOC_TYPE_BCM1250:
  83         case K_SYS_SOC_TYPE_BCM1250_ALT:
  84         case K_SYS_SOC_TYPE_BCM1250_ALT2:
  85         case K_SYS_SOC_TYPE_BCM1125:
  86         case K_SYS_SOC_TYPE_BCM1125H:
  87                 return soc_pass < K_SYS_REVISION_BCM1250_C0;
  88
  89         default:
  90                 return 0;
  91         }
  92 }
  93
  94 static int __init setup_bcm112x(void)
  95 {
  96         int ret = 0;
  97
  98         switch (soc_pass) {
  99         case 0:
 100                 /* Early build didn't have revid set */
 101                 periph_rev = 3;
 102                 pass_str = "A1";
 103                 war_pass = K_SYS_REVISION_BCM112x_A1;
 104                 break;
 105         case K_SYS_REVISION_BCM112x_A1:
 106                 periph_rev = 3;
 107                 pass_str = "A1";
 108                 break;
 109         case K_SYS_REVISION_BCM112x_A2:
 110                 periph_rev = 3;
 111                 pass_str = "A2";
 112                 break;
 113         case K_SYS_REVISION_BCM112x_A3:
 114                 periph_rev = 3;
 115                 pass_str = "A3";
 116                 break;
 117         case K_SYS_REVISION_BCM112x_A4:
 118                 periph_rev = 3;
 119                 pass_str = "A4";
 120                 break;
 121         case K_SYS_REVISION_BCM112x_B0:
 122                 periph_rev = 3;
 123                 pass_str = "B0";
 124                 break;
 125         default:
 126                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
 127                 ret = 1;
 128         }
 129
 130         return ret;
 131 }
 132
 133 /* Setup code likely to be common to all SiByte platforms */
 134
 135 static int __init sys_rev_decode(void)
 136 {
 137         int ret = 0;
 138
 139         war_pass = soc_pass;
 140         switch (soc_type) {
 141         case K_SYS_SOC_TYPE_BCM1250:
 142         case K_SYS_SOC_TYPE_BCM1250_ALT:
 143         case K_SYS_SOC_TYPE_BCM1250_ALT2:
 144                 soc_str = "BCM1250";
 145                 ret = setup_bcm1250();
 146                 break;
 147         case K_SYS_SOC_TYPE_BCM1120:
 148                 soc_str = "BCM1120";
 149                 ret = setup_bcm112x();
 150                 break;
 151         case K_SYS_SOC_TYPE_BCM1125:
 152                 soc_str = "BCM1125";
 153                 ret = setup_bcm112x();
 154                 break;
 155         case K_SYS_SOC_TYPE_BCM1125H:
 156                 soc_str = "BCM1125H";
 157                 ret = setup_bcm112x();
 158                 break;
 159         default:
 160                 printk("Unknown SOC type %x\n", soc_type);
 161                 ret = 1;
 162                 break;
 163         }
 164
 165         return ret;
 166 }
 167
 168 void __init sb1250_setup(void)
 169 {
 170         uint64_t sys_rev;
 171         int plldiv;
 172         int bad_config = 0;
 173
 174         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 175         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 176         soc_type = SYS_SOC_TYPE(sys_rev);
 177         soc_pass = G_SYS_REVISION(sys_rev);
 178
 179         if (sys_rev_decode()) {
 180                 printk("Restart after failure to identify SiByte chip\n");
 181                 machine_restart(NULL);
 182         }
 183
 184         plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 185         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 186
 187         printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
 188                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 189         printk("Board type: %s\n", get_system_type());
 190
 191         switch (war_pass) {
 192         case K_SYS_REVISION_BCM1250_PASS1:
 193                 printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
 194                             "and the kernel doesn't have the proper "
 195                             "workarounds compiled in. @@@@\n");
 196                 bad_config = 1;
 197                 break;
 198         case K_SYS_REVISION_BCM1250_PASS2:
 199                 /* Pass 2 - easiest as default for now - so many numbers */
 200 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
 201     !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
 202                 printk("@@@@ This is a BCM1250 A3-A10 board, and the "
 203                             "kernel doesn't have the proper workarounds "
 204                             "compiled in. @@@@\n");
 205                 bad_config = 1;
 206 #endif
 207 #ifdef CONFIG_CPU_HAS_PREFETCH
 208                 printk("@@@@ Prefetches may be enabled in this kernel, "
 209                             "but are buggy on this board.  @@@@\n");
 210                 bad_config = 1;
 211 #endif
 212                 break;
 213         case K_SYS_REVISION_BCM1250_PASS2_2:
 214 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
 215                 printk("@@@@ This is a BCM1250 B1/B2. board, and the "
 216                             "kernel doesn't have the proper workarounds "
 217                             "compiled in. @@@@\n");
 218                 bad_config = 1;
 219 #endif
 220 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
 221     !defined(CONFIG_CPU_HAS_PREFETCH)
 222                 printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
 223                             "conservatively configured for an 'A' stepping. "
 224                             "@@@@\n");
 225 #endif
 226                 break;
 227         default:
 228                 break;
 229         }
 230         if (bad_config) {
 231                 printk("Invalid configuration for this chip.\n");
 232                 machine_restart(NULL);
 233         }
 234 }