xref: /linux/arch/mips/sibyte/sb1250/setup.c (revision de2fe5e07d58424bc286fff3fd3c1b0bf933cd58)
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/config.h>
19 #include <linux/init.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 
37 static char *soc_str;
38 static char *pass_str;
39 static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
40 
41 static inline int setup_bcm1250(void);
42 static inline int setup_bcm112x(void);
43 
44 /* Setup code likely to be common to all SiByte platforms */
45 
46 static int __init sys_rev_decode(void)
47 {
48 	int ret = 0;
49 
50 	war_pass = soc_pass;
51 	switch (soc_type) {
52 	case K_SYS_SOC_TYPE_BCM1250:
53 	case K_SYS_SOC_TYPE_BCM1250_ALT:
54 	case K_SYS_SOC_TYPE_BCM1250_ALT2:
55 		soc_str = "BCM1250";
56 		ret = setup_bcm1250();
57 		break;
58 	case K_SYS_SOC_TYPE_BCM1120:
59 		soc_str = "BCM1120";
60 		ret = setup_bcm112x();
61 		break;
62 	case K_SYS_SOC_TYPE_BCM1125:
63 		soc_str = "BCM1125";
64 		ret = setup_bcm112x();
65 		break;
66 	case K_SYS_SOC_TYPE_BCM1125H:
67 		soc_str = "BCM1125H";
68 		ret = setup_bcm112x();
69 		break;
70 	default:
71 		prom_printf("Unknown SOC type %x\n", soc_type);
72 		ret = 1;
73 		break;
74 	}
75 	return ret;
76 }
77 
78 static int __init setup_bcm1250(void)
79 {
80 	int ret = 0;
81 
82 	switch (soc_pass) {
83 	case K_SYS_REVISION_BCM1250_PASS1:
84 		periph_rev = 1;
85 		pass_str = "Pass 1";
86 		break;
87 	case K_SYS_REVISION_BCM1250_A10:
88 		periph_rev = 2;
89 		pass_str = "A8/A10";
90 		/* XXXKW different war_pass? */
91 		war_pass = K_SYS_REVISION_BCM1250_PASS2;
92 		break;
93 	case K_SYS_REVISION_BCM1250_PASS2_2:
94 		periph_rev = 2;
95 		pass_str = "B1";
96 		break;
97 	case K_SYS_REVISION_BCM1250_B2:
98 		periph_rev = 2;
99 		pass_str = "B2";
100 		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
101 		break;
102 	case K_SYS_REVISION_BCM1250_PASS3:
103 		periph_rev = 3;
104 		pass_str = "C0";
105 		break;
106 	case K_SYS_REVISION_BCM1250_C1:
107 		periph_rev = 3;
108 		pass_str = "C1";
109 		break;
110 	default:
111 		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
112 			periph_rev = 2;
113 			pass_str = "A0-A6";
114 			war_pass = K_SYS_REVISION_BCM1250_PASS2;
115 		} else {
116 			prom_printf("Unknown BCM1250 rev %x\n", soc_pass);
117 			ret = 1;
118 		}
119 		break;
120 	}
121 	return ret;
122 }
123 
124 static int __init setup_bcm112x(void)
125 {
126 	int ret = 0;
127 
128 	switch (soc_pass) {
129 	case 0:
130 		/* Early build didn't have revid set */
131 		periph_rev = 3;
132 		pass_str = "A1";
133 		war_pass = K_SYS_REVISION_BCM112x_A1;
134 		break;
135 	case K_SYS_REVISION_BCM112x_A1:
136 		periph_rev = 3;
137 		pass_str = "A1";
138 		break;
139 	case K_SYS_REVISION_BCM112x_A2:
140 		periph_rev = 3;
141 		pass_str = "A2";
142 		break;
143 	default:
144 		prom_printf("Unknown %s rev %x\n", soc_str, soc_pass);
145 		ret = 1;
146 	}
147 	return ret;
148 }
149 
150 void __init sb1250_setup(void)
151 {
152 	uint64_t sys_rev;
153 	int plldiv;
154 	int bad_config = 0;
155 
156 	sb1_pass = read_c0_prid() & 0xff;
157 	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
158 	soc_type = SYS_SOC_TYPE(sys_rev);
159 	soc_pass = G_SYS_REVISION(sys_rev);
160 
161 	if (sys_rev_decode()) {
162 		prom_printf("Restart after failure to identify SiByte chip\n");
163 		machine_restart(NULL);
164 	}
165 
166 	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
167 	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
168 
169 	prom_printf("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
170 		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
171 	prom_printf("Board type: %s\n", get_system_type());
172 
173 	switch (war_pass) {
174 	case K_SYS_REVISION_BCM1250_PASS1:
175 #ifndef CONFIG_SB1_PASS_1_WORKAROUNDS
176 		prom_printf("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
177 		            "and the kernel doesn't have the proper "
178 		            "workarounds compiled in. @@@@\n");
179 		bad_config = 1;
180 #endif
181 		break;
182 	case K_SYS_REVISION_BCM1250_PASS2:
183 		/* Pass 2 - easiest as default for now - so many numbers */
184 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
185     !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
186 		prom_printf("@@@@ This is a BCM1250 A3-A10 board, and the "
187 		            "kernel doesn't have the proper workarounds "
188 		            "compiled in. @@@@\n");
189 		bad_config = 1;
190 #endif
191 #ifdef CONFIG_CPU_HAS_PREFETCH
192 		prom_printf("@@@@ Prefetches may be enabled in this kernel, "
193 		            "but are buggy on this board.  @@@@\n");
194 		bad_config = 1;
195 #endif
196 		break;
197 	case K_SYS_REVISION_BCM1250_PASS2_2:
198 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
199 		prom_printf("@@@@ This is a BCM1250 B1/B2. board, and the "
200 		            "kernel doesn't have the proper workarounds "
201 		            "compiled in. @@@@\n");
202 		bad_config = 1;
203 #endif
204 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
205     !defined(CONFIG_CPU_HAS_PREFETCH)
206 		prom_printf("@@@@ This is a BCM1250 B1/B2, but the kernel is "
207 		            "conservatively configured for an 'A' stepping. "
208 		            "@@@@\n");
209 #endif
210 		break;
211 	default:
212 		break;
213 	}
214 	if (bad_config) {
215 		prom_printf("Invalid configuration for this chip.\n");
216 		machine_restart(NULL);
217 	}
218 }
219