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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 }
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