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
setup_bcm1x80_bcm1x55(void)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
sys_rev_decode(void)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
bcm1480_setup(void)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