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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
41c594ab | 2 | /* |
b633648c | 3 | * General MIPS MT support routines, usable in AP/SP and SMVP. |
41c594ab RB |
4 | * Copyright (C) 2005 Mips Technologies, Inc |
5 | */ | |
6 | ||
27a3bbaf | 7 | #include <linux/device.h> |
41c594ab RB |
8 | #include <linux/kernel.h> |
9 | #include <linux/sched.h> | |
73bc256d | 10 | #include <linux/export.h> |
41c594ab | 11 | #include <linux/interrupt.h> |
f72af3cf | 12 | #include <linux/security.h> |
41c594ab RB |
13 | |
14 | #include <asm/cpu.h> | |
15 | #include <asm/processor.h> | |
60063497 | 16 | #include <linux/atomic.h> |
41c594ab RB |
17 | #include <asm/hardirq.h> |
18 | #include <asm/mmu_context.h> | |
41c594ab RB |
19 | #include <asm/mipsmtregs.h> |
20 | #include <asm/r4kcache.h> | |
21 | #include <asm/cacheflush.h> | |
22 | ||
07cc0c9e RB |
23 | int vpelimit; |
24 | ||
25 | static int __init maxvpes(char *str) | |
26 | { | |
27 | get_option(&str, &vpelimit); | |
28 | ||
29 | return 1; | |
30 | } | |
31 | ||
32 | __setup("maxvpes=", maxvpes); | |
33 | ||
34 | int tclimit; | |
35 | ||
36 | static int __init maxtcs(char *str) | |
37 | { | |
38 | get_option(&str, &tclimit); | |
39 | ||
40 | return 1; | |
41 | } | |
42 | ||
43 | __setup("maxtcs=", maxtcs); | |
44 | ||
41c594ab RB |
45 | /* |
46 | * Dump new MIPS MT state for the core. Does not leave TCs halted. | |
47 | * Takes an argument which taken to be a pre-call MVPControl value. | |
48 | */ | |
49 | ||
50 | void mips_mt_regdump(unsigned long mvpctl) | |
51 | { | |
52 | unsigned long flags; | |
53 | unsigned long vpflags; | |
54 | unsigned long mvpconf0; | |
55 | int nvpe; | |
56 | int ntc; | |
57 | int i; | |
58 | int tc; | |
59 | unsigned long haltval; | |
60 | unsigned long tcstatval; | |
41c594ab RB |
61 | |
62 | local_irq_save(flags); | |
63 | vpflags = dvpe(); | |
64 | printk("=== MIPS MT State Dump ===\n"); | |
65 | printk("-- Global State --\n"); | |
66 | printk(" MVPControl Passed: %08lx\n", mvpctl); | |
67 | printk(" MVPControl Read: %08lx\n", vpflags); | |
68 | printk(" MVPConf0 : %08lx\n", (mvpconf0 = read_c0_mvpconf0())); | |
69 | nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1; | |
70 | ntc = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1; | |
71 | printk("-- per-VPE State --\n"); | |
d223a861 RB |
72 | for (i = 0; i < nvpe; i++) { |
73 | for (tc = 0; tc < ntc; tc++) { | |
41c594ab | 74 | settc(tc); |
d223a861 RB |
75 | if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) { |
76 | printk(" VPE %d\n", i); | |
77 | printk(" VPEControl : %08lx\n", | |
78 | read_vpe_c0_vpecontrol()); | |
79 | printk(" VPEConf0 : %08lx\n", | |
80 | read_vpe_c0_vpeconf0()); | |
81 | printk(" VPE%d.Status : %08lx\n", | |
82 | i, read_vpe_c0_status()); | |
b012cffe RB |
83 | printk(" VPE%d.EPC : %08lx %pS\n", |
84 | i, read_vpe_c0_epc(), | |
85 | (void *) read_vpe_c0_epc()); | |
d223a861 RB |
86 | printk(" VPE%d.Cause : %08lx\n", |
87 | i, read_vpe_c0_cause()); | |
88 | printk(" VPE%d.Config7 : %08lx\n", | |
89 | i, read_vpe_c0_config7()); | |
90 | break; /* Next VPE */ | |
91 | } | |
41c594ab | 92 | } |
41c594ab RB |
93 | } |
94 | printk("-- per-TC State --\n"); | |
d223a861 | 95 | for (tc = 0; tc < ntc; tc++) { |
41c594ab | 96 | settc(tc); |
d223a861 | 97 | if (read_tc_c0_tcbind() == read_c0_tcbind()) { |
41c594ab RB |
98 | /* Are we dumping ourself? */ |
99 | haltval = 0; /* Then we're not halted, and mustn't be */ | |
100 | tcstatval = flags; /* And pre-dump TCStatus is flags */ | |
101 | printk(" TC %d (current TC with VPE EPC above)\n", tc); | |
102 | } else { | |
103 | haltval = read_tc_c0_tchalt(); | |
104 | write_tc_c0_tchalt(1); | |
105 | tcstatval = read_tc_c0_tcstatus(); | |
106 | printk(" TC %d\n", tc); | |
107 | } | |
108 | printk(" TCStatus : %08lx\n", tcstatval); | |
109 | printk(" TCBind : %08lx\n", read_tc_c0_tcbind()); | |
b012cffe RB |
110 | printk(" TCRestart : %08lx %pS\n", |
111 | read_tc_c0_tcrestart(), (void *) read_tc_c0_tcrestart()); | |
41c594ab RB |
112 | printk(" TCHalt : %08lx\n", haltval); |
113 | printk(" TCContext : %08lx\n", read_tc_c0_tccontext()); | |
114 | if (!haltval) | |
115 | write_tc_c0_tchalt(0); | |
116 | } | |
41c594ab RB |
117 | printk("===========================\n"); |
118 | evpe(vpflags); | |
119 | local_irq_restore(flags); | |
120 | } | |
121 | ||
41c594ab RB |
122 | static int mt_opt_rpsctl = -1; |
123 | static int mt_opt_nblsu = -1; | |
982f6ffe | 124 | static int mt_opt_forceconfig7; |
41c594ab RB |
125 | static int mt_opt_config7 = -1; |
126 | ||
41c594ab RB |
127 | static int __init rpsctl_set(char *str) |
128 | { | |
129 | get_option(&str, &mt_opt_rpsctl); | |
130 | return 1; | |
131 | } | |
132 | __setup("rpsctl=", rpsctl_set); | |
133 | ||
134 | static int __init nblsu_set(char *str) | |
135 | { | |
136 | get_option(&str, &mt_opt_nblsu); | |
137 | return 1; | |
138 | } | |
139 | __setup("nblsu=", nblsu_set); | |
140 | ||
141 | static int __init config7_set(char *str) | |
142 | { | |
143 | get_option(&str, &mt_opt_config7); | |
144 | mt_opt_forceconfig7 = 1; | |
145 | return 1; | |
146 | } | |
147 | __setup("config7=", config7_set); | |
148 | ||
982f6ffe | 149 | static unsigned int itc_base; |
41c594ab RB |
150 | |
151 | static int __init set_itc_base(char *str) | |
152 | { | |
153 | get_option(&str, &itc_base); | |
154 | return 1; | |
155 | } | |
156 | ||
157 | __setup("itcbase=", set_itc_base); | |
158 | ||
159 | void mips_mt_set_cpuoptions(void) | |
160 | { | |
161 | unsigned int oconfig7 = read_c0_config7(); | |
162 | unsigned int nconfig7 = oconfig7; | |
163 | ||
41c594ab RB |
164 | if (mt_opt_rpsctl >= 0) { |
165 | printk("34K return prediction stack override set to %d.\n", | |
166 | mt_opt_rpsctl); | |
167 | if (mt_opt_rpsctl) | |
168 | nconfig7 |= (1 << 2); | |
169 | else | |
170 | nconfig7 &= ~(1 << 2); | |
171 | } | |
172 | if (mt_opt_nblsu >= 0) { | |
173 | printk("34K ALU/LSU sync override set to %d.\n", mt_opt_nblsu); | |
174 | if (mt_opt_nblsu) | |
175 | nconfig7 |= (1 << 5); | |
176 | else | |
177 | nconfig7 &= ~(1 << 5); | |
178 | } | |
179 | if (mt_opt_forceconfig7) { | |
180 | printk("CP0.Config7 forced to 0x%08x.\n", mt_opt_config7); | |
181 | nconfig7 = mt_opt_config7; | |
182 | } | |
183 | if (oconfig7 != nconfig7) { | |
184 | __asm__ __volatile("sync"); | |
185 | write_c0_config7(nconfig7); | |
49a89efb | 186 | ehb(); |
41c594ab RB |
187 | printk("Config7: 0x%08x\n", read_c0_config7()); |
188 | } | |
189 | ||
41c594ab RB |
190 | if (itc_base != 0) { |
191 | /* | |
192 | * Configure ITC mapping. This code is very | |
193 | * specific to the 34K core family, which uses | |
194 | * a special mode bit ("ITC") in the ErrCtl | |
195 | * register to enable access to ITC control | |
196 | * registers via cache "tag" operations. | |
197 | */ | |
198 | unsigned long ectlval; | |
199 | unsigned long itcblkgrn; | |
200 | ||
201 | /* ErrCtl register is known as "ecc" to Linux */ | |
202 | ectlval = read_c0_ecc(); | |
203 | write_c0_ecc(ectlval | (0x1 << 26)); | |
204 | ehb(); | |
205 | #define INDEX_0 (0x80000000) | |
206 | #define INDEX_8 (0x80000008) | |
207 | /* Read "cache tag" for Dcache pseudo-index 8 */ | |
208 | cache_op(Index_Load_Tag_D, INDEX_8); | |
209 | ehb(); | |
210 | itcblkgrn = read_c0_dtaglo(); | |
211 | itcblkgrn &= 0xfffe0000; | |
212 | /* Set for 128 byte pitch of ITC cells */ | |
213 | itcblkgrn |= 0x00000c00; | |
214 | /* Stage in Tag register */ | |
215 | write_c0_dtaglo(itcblkgrn); | |
216 | ehb(); | |
217 | /* Write out to ITU with CACHE op */ | |
218 | cache_op(Index_Store_Tag_D, INDEX_8); | |
219 | /* Now set base address, and turn ITC on with 0x1 bit */ | |
220 | write_c0_dtaglo((itc_base & 0xfffffc00) | 0x1 ); | |
221 | ehb(); | |
222 | /* Write out to ITU with CACHE op */ | |
223 | cache_op(Index_Store_Tag_D, INDEX_0); | |
224 | write_c0_ecc(ectlval); | |
225 | ehb(); | |
226 | printk("Mapped %ld ITC cells starting at 0x%08x\n", | |
227 | ((itcblkgrn & 0x7fe00000) >> 20), itc_base); | |
228 | } | |
229 | } | |
230 | ||
27a3bbaf RB |
231 | struct class *mt_class; |
232 | ||
233 | static int __init mt_init(void) | |
234 | { | |
235 | struct class *mtc; | |
236 | ||
237 | mtc = class_create(THIS_MODULE, "mt"); | |
238 | if (IS_ERR(mtc)) | |
239 | return PTR_ERR(mtc); | |
240 | ||
241 | mt_class = mtc; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | subsys_initcall(mt_init); |