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