xref: /linux/arch/mips/sibyte/sb1250/setup.c (revision c537b994505099b7197e7d3125b942ecbcc51eb6)
1 /*
2  * Copyright (C) 2000, 2001, 2002, 2003 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/module.h>
20 #include <linux/kernel.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 #include <asm/sibyte/sb1250_regs.h>
29 #include <asm/sibyte/sb1250_scd.h>
30 
31 unsigned int sb1_pass;
32 unsigned int soc_pass;
33 unsigned int soc_type;
34 unsigned int periph_rev;
35 unsigned int zbbus_mhz;
36 EXPORT_SYMBOL(zbbus_mhz);
37 
38 static char *soc_str;
39 static char *pass_str;
40 static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
41 
42 static inline int setup_bcm1250(void);
43 static inline int setup_bcm112x(void);
44 
45 /* Setup code likely to be common to all SiByte platforms */
46 
47 static int __init sys_rev_decode(void)
48 {
49 	int ret = 0;
50 
51 	war_pass = soc_pass;
52 	switch (soc_type) {
53 	case K_SYS_SOC_TYPE_BCM1250:
54 	case K_SYS_SOC_TYPE_BCM1250_ALT:
55 	case K_SYS_SOC_TYPE_BCM1250_ALT2:
56 		soc_str = "BCM1250";
57 		ret = setup_bcm1250();
58 		break;
59 	case K_SYS_SOC_TYPE_BCM1120:
60 		soc_str = "BCM1120";
61 		ret = setup_bcm112x();
62 		break;
63 	case K_SYS_SOC_TYPE_BCM1125:
64 		soc_str = "BCM1125";
65 		ret = setup_bcm112x();
66 		break;
67 	case K_SYS_SOC_TYPE_BCM1125H:
68 		soc_str = "BCM1125H";
69 		ret = setup_bcm112x();
70 		break;
71 	default:
72 		printk("Unknown SOC type %x\n", soc_type);
73 		ret = 1;
74 		break;
75 	}
76 	return ret;
77 }
78 
79 static int __init setup_bcm1250(void)
80 {
81 	int ret = 0;
82 
83 	switch (soc_pass) {
84 	case K_SYS_REVISION_BCM1250_PASS1:
85 		periph_rev = 1;
86 		pass_str = "Pass 1";
87 		break;
88 	case K_SYS_REVISION_BCM1250_A10:
89 		periph_rev = 2;
90 		pass_str = "A8/A10";
91 		/* XXXKW different war_pass? */
92 		war_pass = K_SYS_REVISION_BCM1250_PASS2;
93 		break;
94 	case K_SYS_REVISION_BCM1250_PASS2_2:
95 		periph_rev = 2;
96 		pass_str = "B1";
97 		break;
98 	case K_SYS_REVISION_BCM1250_B2:
99 		periph_rev = 2;
100 		pass_str = "B2";
101 		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
102 		break;
103 	case K_SYS_REVISION_BCM1250_PASS3:
104 		periph_rev = 3;
105 		pass_str = "C0";
106 		break;
107 	case K_SYS_REVISION_BCM1250_C1:
108 		periph_rev = 3;
109 		pass_str = "C1";
110 		break;
111 	default:
112 		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
113 			periph_rev = 2;
114 			pass_str = "A0-A6";
115 			war_pass = K_SYS_REVISION_BCM1250_PASS2;
116 		} else {
117 			printk("Unknown BCM1250 rev %x\n", soc_pass);
118 			ret = 1;
119 		}
120 		break;
121 	}
122 	return ret;
123 }
124 
125 static int __init setup_bcm112x(void)
126 {
127 	int ret = 0;
128 
129 	switch (soc_pass) {
130 	case 0:
131 		/* Early build didn't have revid set */
132 		periph_rev = 3;
133 		pass_str = "A1";
134 		war_pass = K_SYS_REVISION_BCM112x_A1;
135 		break;
136 	case K_SYS_REVISION_BCM112x_A1:
137 		periph_rev = 3;
138 		pass_str = "A1";
139 		break;
140 	case K_SYS_REVISION_BCM112x_A2:
141 		periph_rev = 3;
142 		pass_str = "A2";
143 		break;
144 	default:
145 		printk("Unknown %s rev %x\n", soc_str, soc_pass);
146 		ret = 1;
147 	}
148 	return ret;
149 }
150 
151 void __init sb1250_setup(void)
152 {
153 	uint64_t sys_rev;
154 	int plldiv;
155 	int bad_config = 0;
156 
157 	sb1_pass = read_c0_prid() & 0xff;
158 	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
159 	soc_type = SYS_SOC_TYPE(sys_rev);
160 	soc_pass = G_SYS_REVISION(sys_rev);
161 
162 	if (sys_rev_decode()) {
163 		printk("Restart after failure to identify SiByte chip\n");
164 		machine_restart(NULL);
165 	}
166 
167 	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
168 	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
169 
170 	printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
171 		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
172 	printk("Board type: %s\n", get_system_type());
173 
174 	switch (war_pass) {
175 	case K_SYS_REVISION_BCM1250_PASS1:
176 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
177 		printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
178 		            "and the kernel doesn't have the proper "
179 		            "workarounds compiled in. @@@@\n");
180 		bad_config = 1;
181 #endif
182 		break;
183 	case K_SYS_REVISION_BCM1250_PASS2:
184 		/* Pass 2 - easiest as default for now - so many numbers */
185 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
186     !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
187 		printk("@@@@ This is a BCM1250 A3-A10 board, and the "
188 		            "kernel doesn't have the proper workarounds "
189 		            "compiled in. @@@@\n");
190 		bad_config = 1;
191 #endif
192 #ifdef CONFIG_CPU_HAS_PREFETCH
193 		printk("@@@@ Prefetches may be enabled in this kernel, "
194 		            "but are buggy on this board.  @@@@\n");
195 		bad_config = 1;
196 #endif
197 		break;
198 	case K_SYS_REVISION_BCM1250_PASS2_2:
199 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
200 		printk("@@@@ This is a BCM1250 B1/B2. board, and the "
201 		            "kernel doesn't have the proper workarounds "
202 		            "compiled in. @@@@\n");
203 		bad_config = 1;
204 #endif
205 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
206     !defined(CONFIG_CPU_HAS_PREFETCH)
207 		printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
208 		            "conservatively configured for an 'A' stepping. "
209 		            "@@@@\n");
210 #endif
211 		break;
212 	default:
213 		break;
214 	}
215 	if (bad_config) {
216 		printk("Invalid configuration for this chip.\n");
217 		machine_restart(NULL);
218 	}
219 }
220