xref: /openbmc/linux/arch/mips/sibyte/sb1250/setup.c (revision 1a59d1b8)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation
4  */
5 #include <linux/export.h>
6 #include <linux/init.h>
7 #include <linux/kernel.h>
8 #include <linux/reboot.h>
9 #include <linux/string.h>
10 
11 #include <asm/bootinfo.h>
12 #include <asm/cpu.h>
13 #include <asm/mipsregs.h>
14 #include <asm/io.h>
15 #include <asm/sibyte/sb1250.h>
16 #include <asm/sibyte/sb1250_regs.h>
17 #include <asm/sibyte/sb1250_scd.h>
18 
19 unsigned int sb1_pass;
20 unsigned int soc_pass;
21 unsigned int soc_type;
22 EXPORT_SYMBOL(soc_type);
23 unsigned int periph_rev;
24 EXPORT_SYMBOL_GPL(periph_rev);
25 unsigned int zbbus_mhz;
26 EXPORT_SYMBOL(zbbus_mhz);
27 
28 static char *soc_str;
29 static char *pass_str;
30 static unsigned int war_pass;	/* XXXKW don't overload PASS defines? */
31 
setup_bcm1250(void)32 static int __init setup_bcm1250(void)
33 {
34 	int ret = 0;
35 
36 	switch (soc_pass) {
37 	case K_SYS_REVISION_BCM1250_PASS1:
38 		periph_rev = 1;
39 		pass_str = "Pass 1";
40 		break;
41 	case K_SYS_REVISION_BCM1250_A10:
42 		periph_rev = 2;
43 		pass_str = "A8/A10";
44 		/* XXXKW different war_pass? */
45 		war_pass = K_SYS_REVISION_BCM1250_PASS2;
46 		break;
47 	case K_SYS_REVISION_BCM1250_PASS2_2:
48 		periph_rev = 2;
49 		pass_str = "B1";
50 		break;
51 	case K_SYS_REVISION_BCM1250_B2:
52 		periph_rev = 2;
53 		pass_str = "B2";
54 		war_pass = K_SYS_REVISION_BCM1250_PASS2_2;
55 		break;
56 	case K_SYS_REVISION_BCM1250_PASS3:
57 		periph_rev = 3;
58 		pass_str = "C0";
59 		break;
60 	case K_SYS_REVISION_BCM1250_C1:
61 		periph_rev = 3;
62 		pass_str = "C1";
63 		break;
64 	default:
65 		if (soc_pass < K_SYS_REVISION_BCM1250_PASS2_2) {
66 			periph_rev = 2;
67 			pass_str = "A0-A6";
68 			war_pass = K_SYS_REVISION_BCM1250_PASS2;
69 		} else {
70 			printk("Unknown BCM1250 rev %x\n", soc_pass);
71 			ret = 1;
72 		}
73 		break;
74 	}
75 
76 	return ret;
77 }
78 
sb1250_m3_workaround_needed(void)79 int sb1250_m3_workaround_needed(void)
80 {
81 	switch (soc_type) {
82 	case K_SYS_SOC_TYPE_BCM1250:
83 	case K_SYS_SOC_TYPE_BCM1250_ALT:
84 	case K_SYS_SOC_TYPE_BCM1250_ALT2:
85 	case K_SYS_SOC_TYPE_BCM1125:
86 	case K_SYS_SOC_TYPE_BCM1125H:
87 		return soc_pass < K_SYS_REVISION_BCM1250_C0;
88 
89 	default:
90 		return 0;
91 	}
92 }
93 
setup_bcm112x(void)94 static int __init setup_bcm112x(void)
95 {
96 	int ret = 0;
97 
98 	switch (soc_pass) {
99 	case 0:
100 		/* Early build didn't have revid set */
101 		periph_rev = 3;
102 		pass_str = "A1";
103 		war_pass = K_SYS_REVISION_BCM112x_A1;
104 		break;
105 	case K_SYS_REVISION_BCM112x_A1:
106 		periph_rev = 3;
107 		pass_str = "A1";
108 		break;
109 	case K_SYS_REVISION_BCM112x_A2:
110 		periph_rev = 3;
111 		pass_str = "A2";
112 		break;
113 	case K_SYS_REVISION_BCM112x_A3:
114 		periph_rev = 3;
115 		pass_str = "A3";
116 		break;
117 	case K_SYS_REVISION_BCM112x_A4:
118 		periph_rev = 3;
119 		pass_str = "A4";
120 		break;
121 	case K_SYS_REVISION_BCM112x_B0:
122 		periph_rev = 3;
123 		pass_str = "B0";
124 		break;
125 	default:
126 		printk("Unknown %s rev %x\n", soc_str, soc_pass);
127 		ret = 1;
128 	}
129 
130 	return ret;
131 }
132 
133 /* Setup code likely to be common to all SiByte platforms */
134 
sys_rev_decode(void)135 static int __init sys_rev_decode(void)
136 {
137 	int ret = 0;
138 
139 	war_pass = soc_pass;
140 	switch (soc_type) {
141 	case K_SYS_SOC_TYPE_BCM1250:
142 	case K_SYS_SOC_TYPE_BCM1250_ALT:
143 	case K_SYS_SOC_TYPE_BCM1250_ALT2:
144 		soc_str = "BCM1250";
145 		ret = setup_bcm1250();
146 		break;
147 	case K_SYS_SOC_TYPE_BCM1120:
148 		soc_str = "BCM1120";
149 		ret = setup_bcm112x();
150 		break;
151 	case K_SYS_SOC_TYPE_BCM1125:
152 		soc_str = "BCM1125";
153 		ret = setup_bcm112x();
154 		break;
155 	case K_SYS_SOC_TYPE_BCM1125H:
156 		soc_str = "BCM1125H";
157 		ret = setup_bcm112x();
158 		break;
159 	default:
160 		printk("Unknown SOC type %x\n", soc_type);
161 		ret = 1;
162 		break;
163 	}
164 
165 	return ret;
166 }
167 
sb1250_setup(void)168 void __init sb1250_setup(void)
169 {
170 	uint64_t sys_rev;
171 	int plldiv;
172 	int bad_config = 0;
173 
174 	sb1_pass = read_c0_prid() & PRID_REV_MASK;
175 	sys_rev = __raw_readq(IOADDR(A_SCD_SYSTEM_REVISION));
176 	soc_type = SYS_SOC_TYPE(sys_rev);
177 	soc_pass = G_SYS_REVISION(sys_rev);
178 
179 	if (sys_rev_decode()) {
180 		printk("Restart after failure to identify SiByte chip\n");
181 		machine_restart(NULL);
182 	}
183 
184 	plldiv = G_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));
185 	zbbus_mhz = ((plldiv >> 1) * 50) + ((plldiv & 1) * 25);
186 
187 	printk("Broadcom SiByte %s %s @ %d MHz (SB1 rev %d)\n",
188 		    soc_str, pass_str, zbbus_mhz * 2, sb1_pass);
189 	printk("Board type: %s\n", get_system_type());
190 
191 	switch (war_pass) {
192 	case K_SYS_REVISION_BCM1250_PASS1:
193 		printk("@@@@ This is a BCM1250 A0-A2 (Pass 1) board, "
194 			    "and the kernel doesn't have the proper "
195 			    "workarounds compiled in. @@@@\n");
196 		bad_config = 1;
197 		break;
198 	case K_SYS_REVISION_BCM1250_PASS2:
199 		/* Pass 2 - easiest as default for now - so many numbers */
200 #if !defined(CONFIG_SB1_PASS_2_WORKAROUNDS) || \
201     !defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS)
202 		printk("@@@@ This is a BCM1250 A3-A10 board, and the "
203 			    "kernel doesn't have the proper workarounds "
204 			    "compiled in. @@@@\n");
205 		bad_config = 1;
206 #endif
207 #ifdef CONFIG_CPU_HAS_PREFETCH
208 		printk("@@@@ Prefetches may be enabled in this kernel, "
209 			    "but are buggy on this board.  @@@@\n");
210 		bad_config = 1;
211 #endif
212 		break;
213 	case K_SYS_REVISION_BCM1250_PASS2_2:
214 #ifndef CONFIG_SB1_PASS_2_WORKAROUNDS
215 		printk("@@@@ This is a BCM1250 B1/B2. board, and the "
216 			    "kernel doesn't have the proper workarounds "
217 			    "compiled in. @@@@\n");
218 		bad_config = 1;
219 #endif
220 #if defined(CONFIG_SB1_PASS_2_1_WORKAROUNDS) || \
221     !defined(CONFIG_CPU_HAS_PREFETCH)
222 		printk("@@@@ This is a BCM1250 B1/B2, but the kernel is "
223 			    "conservatively configured for an 'A' stepping. "
224 			    "@@@@\n");
225 #endif
226 		break;
227 	default:
228 		break;
229 	}
230 	if (bad_config) {
231 		printk("Invalid configuration for this chip.\n");
232 		machine_restart(NULL);
233 	}
234 }
235