LXR linux/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
  34unsigned int sb1_pass;
  35unsigned int soc_pass;
  36unsigned int soc_type;
  37EXPORT_SYMBOL(soc_type);
  38unsigned int periph_rev;
  39unsigned int zbbus_mhz;
  40EXPORT_SYMBOL(zbbus_mhz);
  41
  42static unsigned int part_type;
  43
  44static char *soc_str;
  45static char *pass_str;
  46
  47static 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
  84static 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
 118void __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}
 141