arch/mips/sibyte/bcm1480/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2000,2001,2002,2003,2004 Broadcom Corporation
   4  */
   5 #include <linux/init.h>
   6 #include <linux/kernel.h>
   7 #include <linux/export.h>
   8 #include <linux/reboot.h>
   9 #include <linux/string.h>
  10
  11 #include <asm/bootinfo.h>
  12 #include <asm/cpu.h>
  13 #include <asm/mipsregs.h>
  14 #include <asm/io.h>
  15 #include <asm/sibyte/sb1250.h>
  16
  17 #include <asm/sibyte/bcm1480_regs.h>
  18 #include <asm/sibyte/bcm1480_scd.h>
  19 #include <asm/sibyte/sb1250_scd.h>
  20
  21 unsigned int sb1_pass;
  22 unsigned int soc_pass;
  23 unsigned int soc_type;
  24 EXPORT_SYMBOL(soc_type);
  25 unsigned int periph_rev;
  26 EXPORT_SYMBOL_GPL(periph_rev);
  27 unsigned int zbbus_mhz;
  28 EXPORT_SYMBOL(zbbus_mhz);
  29
  30 static unsigned int part_type;
  31
  32 static char *soc_str;
  33 static char *pass_str;
  34
  35 static int __init setup_bcm1x80_bcm1x55(void)
  36 {
  37         switch (soc_pass) {
  38         case K_SYS_REVISION_BCM1480_S0:
  39                 periph_rev = 1;
  40                 pass_str = "S0 (pass1)";
  41                 break;
  42         case K_SYS_REVISION_BCM1480_A1:
  43                 periph_rev = 1;
  44                 pass_str = "A1 (pass1)";
  45                 break;
  46         case K_SYS_REVISION_BCM1480_A2:
  47                 periph_rev = 1;
  48                 pass_str = "A2 (pass1)";
  49                 break;
  50         case K_SYS_REVISION_BCM1480_A3:
  51                 periph_rev = 1;
  52                 pass_str = "A3 (pass1)";
  53                 break;
  54         case K_SYS_REVISION_BCM1480_B0:
  55                 periph_rev = 1;
  56                 pass_str = "B0 (pass2)";
  57                 break;
  58         default:
  59                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
  60                 periph_rev = 1;
  61                 pass_str = "Unknown Revision";
  62                 break;
  63         }
  64
  65         return 0;
  66 }
  67
  68 /* Setup code likely to be common to all SiByte platforms */
  69
  70 static int __init sys_rev_decode(void)
  71 {
  72         int ret = 0;
  73
  74         switch (soc_type) {
  75         case K_SYS_SOC_TYPE_BCM1x80:
  76                 if (part_type == K_SYS_PART_BCM1480)
  77                     soc_str = "BCM1480";
  78                 else if (part_type == K_SYS_PART_BCM1280)
  79                     soc_str = "BCM1280";
  80                 else
  81                     soc_str = "BCM1x80";
  82                 ret = setup_bcm1x80_bcm1x55();
  83                 break;
  84
  85         case K_SYS_SOC_TYPE_BCM1x55:
  86                 if (part_type == K_SYS_PART_BCM1455)
  87                     soc_str = "BCM1455";
  88                 else if (part_type == K_SYS_PART_BCM1255)
  89                     soc_str = "BCM1255";
  90                 else
  91                     soc_str = "BCM1x55";
  92                 ret = setup_bcm1x80_bcm1x55();
  93                 break;
  94
  95         default:
  96                 printk("Unknown part type %x\n", part_type);
  97                 ret = 1;
  98                 break;
  99         }
 100
 101         return ret;
 102 }
 103
 104 void __init bcm1480_setup(void)
 105 {
 106         uint64_t sys_rev;
 107         int plldiv;
 108
 109         sb1_pass = read_c0_prid() & PRID_REV_MASK;
 110         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
 111         soc_type = SYS_SOC_TYPE(sys_rev);
 112         part_type = G_SYS_PART(sys_rev);
 113         soc_pass = G_SYS_REVISION(sys_rev);
 114
 115         if (sys_rev_decode()) {
 116                 printk("Restart after failure to identify SiByte chip\n");
 117                 machine_restart(NULL);
 118         }
 119
 120         plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
 121         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
 122
 123         printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
 124                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
 125         printk("Board type: %s\n", get_system_type());
 126 }