1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * General MIPS MT support routines, usable in AP/SP and SMVP. |
4 | * Copyright (C) 2005 Mips Technologies, Inc |
5 | */ |
6 | |
7 | #include <linux/device.h> |
8 | #include <linux/kernel.h> |
9 | #include <linux/sched.h> |
10 | #include <linux/export.h> |
11 | #include <linux/interrupt.h> |
12 | #include <linux/security.h> |
13 | |
14 | #include <asm/cpu.h> |
15 | #include <asm/processor.h> |
16 | #include <linux/atomic.h> |
17 | #include <asm/hardirq.h> |
18 | #include <asm/mmu_context.h> |
19 | #include <asm/mipsmtregs.h> |
20 | #include <asm/r4kcache.h> |
21 | #include <asm/cacheflush.h> |
22 | #include <asm/mips_mt.h> |
23 | |
24 | int vpelimit; |
25 | |
26 | static int __init maxvpes(char *str) |
27 | { |
28 | get_option(str: &str, pint: &vpelimit); |
29 | |
30 | return 1; |
31 | } |
32 | |
33 | __setup("maxvpes=" , maxvpes); |
34 | |
35 | int tclimit; |
36 | |
37 | static int __init maxtcs(char *str) |
38 | { |
39 | get_option(str: &str, pint: &tclimit); |
40 | |
41 | return 1; |
42 | } |
43 | |
44 | __setup("maxtcs=" , maxtcs); |
45 | |
46 | /* |
47 | * Dump new MIPS MT state for the core. Does not leave TCs halted. |
48 | * Takes an argument which taken to be a pre-call MVPControl value. |
49 | */ |
50 | |
51 | void mips_mt_regdump(unsigned long mvpctl) |
52 | { |
53 | unsigned long flags; |
54 | unsigned long vpflags; |
55 | unsigned long mvpconf0; |
56 | int nvpe; |
57 | int ntc; |
58 | int i; |
59 | int tc; |
60 | unsigned long haltval; |
61 | unsigned long tcstatval; |
62 | |
63 | local_irq_save(flags); |
64 | vpflags = dvpe(); |
65 | printk("=== MIPS MT State Dump ===\n" ); |
66 | printk("-- Global State --\n" ); |
67 | printk(" MVPControl Passed: %08lx\n" , mvpctl); |
68 | printk(" MVPControl Read: %08lx\n" , vpflags); |
69 | printk(" MVPConf0 : %08lx\n" , (mvpconf0 = read_c0_mvpconf0())); |
70 | nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; |
71 | ntc = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1; |
72 | printk("-- per-VPE State --\n" ); |
73 | for (i = 0; i < nvpe; i++) { |
74 | for (tc = 0; tc < ntc; tc++) { |
75 | settc(tc); |
76 | if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) { |
77 | printk(" VPE %d\n" , i); |
78 | printk(" VPEControl : %08lx\n" , |
79 | read_vpe_c0_vpecontrol()); |
80 | printk(" VPEConf0 : %08lx\n" , |
81 | read_vpe_c0_vpeconf0()); |
82 | printk(" VPE%d.Status : %08lx\n" , |
83 | i, read_vpe_c0_status()); |
84 | printk(" VPE%d.EPC : %08lx %pS\n" , |
85 | i, read_vpe_c0_epc(), |
86 | (void *) read_vpe_c0_epc()); |
87 | printk(" VPE%d.Cause : %08lx\n" , |
88 | i, read_vpe_c0_cause()); |
89 | printk(" VPE%d.Config7 : %08lx\n" , |
90 | i, read_vpe_c0_config7()); |
91 | break; /* Next VPE */ |
92 | } |
93 | } |
94 | } |
95 | printk("-- per-TC State --\n" ); |
96 | for (tc = 0; tc < ntc; tc++) { |
97 | settc(tc); |
98 | if (read_tc_c0_tcbind() == read_c0_tcbind()) { |
99 | /* Are we dumping ourself? */ |
100 | haltval = 0; /* Then we're not halted, and mustn't be */ |
101 | tcstatval = flags; /* And pre-dump TCStatus is flags */ |
102 | printk(" TC %d (current TC with VPE EPC above)\n" , tc); |
103 | } else { |
104 | haltval = read_tc_c0_tchalt(); |
105 | write_tc_c0_tchalt(1); |
106 | tcstatval = read_tc_c0_tcstatus(); |
107 | printk(" TC %d\n" , tc); |
108 | } |
109 | printk(" TCStatus : %08lx\n" , tcstatval); |
110 | printk(" TCBind : %08lx\n" , read_tc_c0_tcbind()); |
111 | printk(" TCRestart : %08lx %pS\n" , |
112 | read_tc_c0_tcrestart(), (void *) read_tc_c0_tcrestart()); |
113 | printk(" TCHalt : %08lx\n" , haltval); |
114 | printk(" TCContext : %08lx\n" , read_tc_c0_tccontext()); |
115 | if (!haltval) |
116 | write_tc_c0_tchalt(0); |
117 | } |
118 | printk("===========================\n" ); |
119 | evpe(vpflags); |
120 | local_irq_restore(flags); |
121 | } |
122 | |
123 | static int mt_opt_rpsctl = -1; |
124 | static int mt_opt_nblsu = -1; |
125 | static int mt_opt_forceconfig7; |
126 | static int mt_opt_config7 = -1; |
127 | |
128 | static int __init rpsctl_set(char *str) |
129 | { |
130 | get_option(str: &str, pint: &mt_opt_rpsctl); |
131 | return 1; |
132 | } |
133 | __setup("rpsctl=" , rpsctl_set); |
134 | |
135 | static int __init nblsu_set(char *str) |
136 | { |
137 | get_option(str: &str, pint: &mt_opt_nblsu); |
138 | return 1; |
139 | } |
140 | __setup("nblsu=" , nblsu_set); |
141 | |
142 | static int __init config7_set(char *str) |
143 | { |
144 | get_option(str: &str, pint: &mt_opt_config7); |
145 | mt_opt_forceconfig7 = 1; |
146 | return 1; |
147 | } |
148 | __setup("config7=" , config7_set); |
149 | |
150 | static unsigned int itc_base; |
151 | |
152 | static int __init set_itc_base(char *str) |
153 | { |
154 | get_option(str: &str, pint: &itc_base); |
155 | return 1; |
156 | } |
157 | |
158 | __setup("itcbase=" , set_itc_base); |
159 | |
160 | void mips_mt_set_cpuoptions(void) |
161 | { |
162 | unsigned int oconfig7 = read_c0_config7(); |
163 | unsigned int nconfig7 = oconfig7; |
164 | |
165 | if (mt_opt_rpsctl >= 0) { |
166 | printk("34K return prediction stack override set to %d.\n" , |
167 | mt_opt_rpsctl); |
168 | if (mt_opt_rpsctl) |
169 | nconfig7 |= (1 << 2); |
170 | else |
171 | nconfig7 &= ~(1 << 2); |
172 | } |
173 | if (mt_opt_nblsu >= 0) { |
174 | printk("34K ALU/LSU sync override set to %d.\n" , mt_opt_nblsu); |
175 | if (mt_opt_nblsu) |
176 | nconfig7 |= (1 << 5); |
177 | else |
178 | nconfig7 &= ~(1 << 5); |
179 | } |
180 | if (mt_opt_forceconfig7) { |
181 | printk("CP0.Config7 forced to 0x%08x.\n" , mt_opt_config7); |
182 | nconfig7 = mt_opt_config7; |
183 | } |
184 | if (oconfig7 != nconfig7) { |
185 | __asm__ __volatile("sync" ); |
186 | write_c0_config7(nconfig7); |
187 | ehb(); |
188 | printk("Config7: 0x%08x\n" , read_c0_config7()); |
189 | } |
190 | |
191 | if (itc_base != 0) { |
192 | /* |
193 | * Configure ITC mapping. This code is very |
194 | * specific to the 34K core family, which uses |
195 | * a special mode bit ("ITC") in the ErrCtl |
196 | * register to enable access to ITC control |
197 | * registers via cache "tag" operations. |
198 | */ |
199 | unsigned long ectlval; |
200 | unsigned long itcblkgrn; |
201 | |
202 | /* ErrCtl register is known as "ecc" to Linux */ |
203 | ectlval = read_c0_ecc(); |
204 | write_c0_ecc(ectlval | (0x1 << 26)); |
205 | ehb(); |
206 | #define INDEX_0 (0x80000000) |
207 | #define INDEX_8 (0x80000008) |
208 | /* Read "cache tag" for Dcache pseudo-index 8 */ |
209 | cache_op(Index_Load_Tag_D, INDEX_8); |
210 | ehb(); |
211 | itcblkgrn = read_c0_dtaglo(); |
212 | itcblkgrn &= 0xfffe0000; |
213 | /* Set for 128 byte pitch of ITC cells */ |
214 | itcblkgrn |= 0x00000c00; |
215 | /* Stage in Tag register */ |
216 | write_c0_dtaglo(itcblkgrn); |
217 | ehb(); |
218 | /* Write out to ITU with CACHE op */ |
219 | cache_op(Index_Store_Tag_D, INDEX_8); |
220 | /* Now set base address, and turn ITC on with 0x1 bit */ |
221 | write_c0_dtaglo((itc_base & 0xfffffc00) | 0x1 ); |
222 | ehb(); |
223 | /* Write out to ITU with CACHE op */ |
224 | cache_op(Index_Store_Tag_D, INDEX_0); |
225 | write_c0_ecc(ectlval); |
226 | ehb(); |
227 | printk("Mapped %ld ITC cells starting at 0x%08x\n" , |
228 | ((itcblkgrn & 0x7fe00000) >> 20), itc_base); |
229 | } |
230 | } |
231 | |
232 | const struct class mt_class = { |
233 | .name = "mt" , |
234 | }; |
235 | |
236 | static int __init mips_mt_init(void) |
237 | { |
238 | return class_register(class: &mt_class); |
239 | } |
240 | |
241 | subsys_initcall(mips_mt_init); |
242 | |