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
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
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
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
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
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
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