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
34unsigned int sb1_pass;
35unsigned int soc_pass;
36unsigned int soc_type;
37EXPORT_SYMBOL(soc_type);
38unsigned int periph_rev;
39unsigned int zbbus_mhz;
40EXPORT_SYMBOL(zbbus_mhz);
41
42static unsigned int part_type;
43
44static char *soc_str;
45static char *pass_str;
46
47static 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
84static 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
118void __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