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[MIPS] BCM1480: Export zbbus_mhz.
[~andy/linux] / arch / mips / sibyte / bcm1480 / setup.c
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/kernel.h>
19 #include <linux/module.h>
20 #include <linux/reboot.h>
21 #include <linux/string.h>
22
23 #include <asm/bootinfo.h>
24 #include <asm/mipsregs.h>
25 #include <asm/io.h>
26 #include <asm/sibyte/sb1250.h>
27
28 #include <asm/sibyte/bcm1480_regs.h>
29 #include <asm/sibyte/bcm1480_scd.h>
30 #include <asm/sibyte/sb1250_scd.h>
31
32 unsigned int sb1_pass;
33 unsigned int soc_pass;
34 unsigned int soc_type;
35 EXPORT_SYMBOL(soc_type);
36 unsigned int periph_rev;
37 unsigned int zbbus_mhz;
38 EXPORT_SYMBOL(zbbus_mhz);
39
40 static unsigned int part_type;
41
42 static char *soc_str;
43 static char *pass_str;
44
45 static inline int setup_bcm1x80_bcm1x55(void);
46
47 /* Setup code likely to be common to all SiByte platforms */
48
49 static inline int sys_rev_decode(void)
50 {
51         int ret = 0;
52
53         switch (soc_type) {
54             case K_SYS_SOC_TYPE_BCM1x80:
55                 if (part_type == K_SYS_PART_BCM1480)
56                     soc_str = "BCM1480";
57                 else if (part_type == K_SYS_PART_BCM1280)
58                     soc_str = "BCM1280";
59                 else
60                     soc_str = "BCM1x80";
61                 ret = setup_bcm1x80_bcm1x55();
62                 break;
63
64             case K_SYS_SOC_TYPE_BCM1x55:
65                 if (part_type == K_SYS_PART_BCM1455)
66                     soc_str = "BCM1455";
67                 else if (part_type == K_SYS_PART_BCM1255)
68                     soc_str = "BCM1255";
69                 else
70                     soc_str = "BCM1x55";
71                 ret = setup_bcm1x80_bcm1x55();
72                 break;
73
74             default:
75                 printk("Unknown part type %x\n", part_type);
76                 ret = 1;
77                 break;
78         }
79         return ret;
80 }
81
82 static inline int setup_bcm1x80_bcm1x55(void)
83 {
84         int ret = 0;
85
86         switch (soc_pass) {
87             case K_SYS_REVISION_BCM1480_S0:
88                 periph_rev = 1;
89                 pass_str = "S0 (pass1)";
90                 break;
91             case K_SYS_REVISION_BCM1480_A1:
92                 periph_rev = 1;
93                 pass_str = "A1 (pass1)";
94                 break;
95             case K_SYS_REVISION_BCM1480_A2:
96                 periph_rev = 1;
97                 pass_str = "A2 (pass1)";
98                 break;
99             case K_SYS_REVISION_BCM1480_A3:
100                 periph_rev = 1;
101                 pass_str = "A3 (pass1)";
102                 break;
103             case K_SYS_REVISION_BCM1480_B0:
104                 periph_rev = 1;
105                 pass_str = "B0 (pass2)";
106                 break;
107             default:
108                 printk("Unknown %s rev %x\n", soc_str, soc_pass);
109                 periph_rev = 1;
110                 pass_str = "Unknown Revision";
111                 break;
112         }
113         return ret;
114 }
115
116 void bcm1480_setup(void)
117 {
118         uint64_t sys_rev;
119         int plldiv;
120
121         sb1_pass = read_c0_prid() & 0xff;
122         sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
123         soc_type = SYS_SOC_TYPE(sys_rev);
124         part_type = G_SYS_PART(sys_rev);
125         soc_pass = G_SYS_REVISION(sys_rev);
126
127         if (sys_rev_decode()) {
128                 printk("Restart after failure to identify SiByte chip\n");
129                 machine_restart(NULL);
130         }
131
132         plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
133         zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
134
135         printk("Broadcom SiByte %s %s @ %d MHz (SB-1A rev %d)\n",
136                     soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
137         printk("Board type: %s\n", get_system_type());
138 }