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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/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 int __init setup_bcm1x80_bcm1x55(void)
 47 {
 48         int ret = 0;
 49 
 50         switch (soc_pass) {
 51         case K_SYS_REVISION_BCM1480_S0:
 52                 periph_rev = 1;
 53                 pass_str = "S0 (pass1)";
 54                 break;
 55         case K_SYS_REVISION_BCM1480_A1:
 56                 periph_rev = 1;
 57                 pass_str = "A1 (pass1)";
 58                 break;
 59         case K_SYS_REVISION_BCM1480_A2:
 60                 periph_rev = 1;
 61                 pass_str = "A2 (pass1)";
 62                 break;
 63         case K_SYS_REVISION_BCM1480_A3:
 64                 periph_rev = 1;
 65                 pass_str = "A3 (pass1)";
 66                 break;
 67         case K_SYS_REVISION_BCM1480_B0:
 68                 periph_rev = 1;
 69                 pass_str = "B0 (pass2)";
 70                 break;
 71         default:
 72                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
 73                 periph_rev = 1;
 74                 pass_str = "Unknown Revision";
 75                 break;
 76         }
 77 
 78         return ret;
 79 }
 80 
 81 /* Setup code likely to be common to all SiByte platforms */
 82 
 83 static int __init sys_rev_decode(void)
 84 {
 85         int ret = 0;
 86 
 87         switch (soc_type) {
 88         case K_SYS_SOC_TYPE_BCM1x80:
 89                 if (part_type == K_SYS_PART_BCM1480)
 90                     soc_str = "BCM1480";
 91                 else if (part_type == K_SYS_PART_BCM1280)
 92                     soc_str = "BCM1280";
 93                 else
 94                     soc_str = "BCM1x80";
 95                 ret = setup_bcm1x80_bcm1x55();
 96                 break;
 97 
 98         case K_SYS_SOC_TYPE_BCM1x55:
 99                 if (part_type == K_SYS_PART_BCM1455)
100                     soc_str = "BCM1455";
101                 else if (part_type == K_SYS_PART_BCM1255)
102                     soc_str = "BCM1255";
103                 else
104                     soc_str = "BCM1x55";
105                 ret = setup_bcm1x80_bcm1x55();
106                 break;
107 
108         default:
109                 printk("Unknown part type %x\n", part_type);
110                 ret = 1;
111                 break;
112         }
113 
114         return ret;
115 }
116 
117 void __init 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 }
140 

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