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/export.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 EXPORT_SYMBOL_GPL(periph_rev);
  40 unsigned int zbbus_mhz;
  41 EXPORT_SYMBOL(zbbus_mhz);
  42
  43 static unsigned int part_type;
  44
  45 static char *soc_str;
  46 static char *pass_str;
  47
  48 static int __init setup_bcm1x80_bcm1x55(void)
  49 {
  50         int ret = 0;
  51
  52         switch (soc_pass) {
  53         case K_SYS_REVISION_BCM1480_S0:
  54                 periph_rev = 1;
  55                 pass_str = "S0 (pass1)";
  56                 break;
  57         case K_SYS_REVISION_BCM1480_A1:
  58                 periph_rev = 1;
  59                 pass_str = "A1 (pass1)";
  60                 break;
  61         case K_SYS_REVISION_BCM1480_A2:
  62                 periph_rev = 1;
  63                 pass_str = "A2 (pass1)";
  64                 break;
  65         case K_SYS_REVISION_BCM1480_A3:
  66                 periph_rev = 1;
  67                 pass_str = "A3 (pass1)";
  68                 break;
  69         case K_SYS_REVISION_BCM1480_B0:
  70                 periph_rev = 1;
  71                 pass_str = "B0 (pass2)";
  72                 break;
  73         default:
  74                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
  75                 periph_rev = 1;
  76                 pass_str = "Unknown Revision";
  77                 break;
  78         }
  79
  80         return ret;
  81 }
  82
  83 /* Setup code likely to be common to all SiByte platforms */
  84
  85 static int __init sys_rev_decode(void)
  86 {
  87         int ret = 0;
  88
  89         switch (soc_type) {
  90         case K_SYS_SOC_TYPE_BCM1x80:
  91                 if (part_type == K_SYS_PART_BCM1480)
  92                     soc_str = "BCM1480";
  93                 else if (part_type == K_SYS_PART_BCM1280)
  94                     soc_str = "BCM1280";
  95                 else
  96                     soc_str = "BCM1x80";
  97                 ret = setup_bcm1x80_bcm1x55();
  98                 break;
  99
 100         case K_SYS_SOC_TYPE_BCM1x55:
 101                 if (part_type == K_SYS_PART_BCM1455)
 102                     soc_str = "BCM1455";
 103                 else if (part_type == K_SYS_PART_BCM1255)
 104                     soc_str = "BCM1255";
 105                 else
 106                     soc_str = "BCM1x55";
 107                 ret = setup_bcm1x80_bcm1x55();
 108                 break;
 109
 110         default:
 111                 printk("Unknown part type %x\n", part_type);
 112                 ret = 1;
 113                 break;
 114         }
 115
 116         return ret;
 117 }
 118
 119 void __init bcm1480_setup(void)
 120 {
 121         uint64_t sys_rev;
 122         int plldiv;
 123
 124         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 125         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 126         soc_type = SYS_SOC_TYPE(sys_rev);
 127         part_type = G_SYS_PART(sys_rev);
 128         soc_pass = G_SYS_REVISION(sys_rev);
 129
 130         if (sys_rev_decode()) {
 131                 printk("Restart after failure to identify SiByte chip\n");
 132                 machine_restart(NULL);
 133         }
 134
 135         plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 136         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 137
 138         printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
 139                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 140         printk("Board type: %s\n", get_system_type());
 141 }