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Linux/arch/mips/sibyte/bcm1480/setup.c

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  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 
 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 unsigned int zbbus_mhz;
 40 EXPORT_SYMBOL(zbbus_mhz);
 41 
 42 static unsigned int part_type;
 43 
 44 static char *soc_str;
 45 static char *pass_str;
 46 
 47 static 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 
 84 static 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 
118 void __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 

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