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