arch/mips/sibyte/bcm1480/setup.c

   1 /*
   2  * Copyright (C) 2000,2001,2002,2003,2004 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/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/reboot.h>
  22 #include <linux/string.h>
  23
  24 #include <asm/bootinfo.h>
  25 #include <asm/cpu.h>
  26 #include <asm/mipsregs.h>
  27 #include <asm/io.h>
  28 #include <asm/sibyte/sb1250.h>
  29
  30 #include <asm/sibyte/bcm1480_regs.h>
  31 #include <asm/sibyte/bcm1480_scd.h>
  32 #include <asm/sibyte/sb1250_scd.h>
  33
  34 unsigned int sb1_pass;
  35 unsigned int soc_pass;
  36 unsigned int soc_type;
  37 EXPORT_SYMBOL(soc_type);
  38 unsigned int periph_rev;
  39 unsigned int zbbus_mhz;
  40 EXPORT_SYMBOL(zbbus_mhz);
  41
  42 static unsigned int part_type;
  43
  44 static char *soc_str;
  45 static char *pass_str;
  46
  47 static int __init setup_bcm1x80_bcm1x55(void)
  48 {
  49         int ret = 0;
  50
  51         switch (soc_pass) {
  52         case K_SYS_REVISION_BCM1480_S0:
  53                 periph_rev = 1;
  54                 pass_str = "S0 (pass1)";
  55                 break;
  56         case K_SYS_REVISION_BCM1480_A1:
  57                 periph_rev = 1;
  58                 pass_str = "A1 (pass1)";
  59                 break;
  60         case K_SYS_REVISION_BCM1480_A2:
  61                 periph_rev = 1;
  62                 pass_str = "A2 (pass1)";
  63                 break;
  64         case K_SYS_REVISION_BCM1480_A3:
  65                 periph_rev = 1;
  66                 pass_str = "A3 (pass1)";
  67                 break;
  68         case K_SYS_REVISION_BCM1480_B0:
  69                 periph_rev = 1;
  70                 pass_str = "B0 (pass2)";
  71                 break;
  72         default:
  73                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
  74                 periph_rev = 1;
  75                 pass_str = "Unknown Revision";
  76                 break;
  77         }
  78
  79         return ret;
  80 }
  81
  82 /* Setup code likely to be common to all SiByte platforms */
  83
  84 static int __init sys_rev_decode(void)
  85 {
  86         int ret = 0;
  87
  88         switch (soc_type) {
  89         case K_SYS_SOC_TYPE_BCM1x80:
  90                 if (part_type == K_SYS_PART_BCM1480)
  91                     soc_str = "BCM1480";
  92                 else if (part_type == K_SYS_PART_BCM1280)
  93                     soc_str = "BCM1280";
  94                 else
  95                     soc_str = "BCM1x80";
  96                 ret = setup_bcm1x80_bcm1x55();
  97                 break;
  98
  99         case K_SYS_SOC_TYPE_BCM1x55:
 100                 if (part_type == K_SYS_PART_BCM1455)
 101                     soc_str = "BCM1455";
 102                 else if (part_type == K_SYS_PART_BCM1255)
 103                     soc_str = "BCM1255";
 104                 else
 105                     soc_str = "BCM1x55";
 106                 ret = setup_bcm1x80_bcm1x55();
 107                 break;
 108
 109         default:
 110                 printk("Unknown part type %x\n", part_type);
 111                 ret = 1;
 112                 break;
 113         }
 114
 115         return ret;
 116 }
 117
 118 void __init bcm1480_setup(void)
 119 {
 120         uint64_t sys_rev;
 121         int plldiv;
 122
 123         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 124         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 125         soc_type = SYS_SOC_TYPE(sys_rev);
 126         part_type = G_SYS_PART(sys_rev);
 127         soc_pass = G_SYS_REVISION(sys_rev);
 128
 129         if (sys_rev_decode()) {
 130                 printk("Restart after failure to identify SiByte chip\n");
 131                 machine_restart(NULL);
 132         }
 133
 134         plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 135         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 136
 137         printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
 138                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 139         printk("Board type: %s\n", get_system_type());
 140 }