2 * General MIPS MT support routines, usable in AP/SP, SMVP, or SMTC kernels
3 * Copyright (C) 2005 Mips Technologies, Inc
6 #include <linux/device.h>
7 #include <linux/kernel.h>
8 #include <linux/sched.h>
9 #include <linux/module.h>
10 #include <linux/interrupt.h>
11 #include <linux/security.h>
14 #include <asm/processor.h>
15 #include <asm/atomic.h>
16 #include <asm/system.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>
25 static int __init maxvpes(char *str)
27 get_option(&str, &vpelimit);
32 __setup("maxvpes=", maxvpes);
36 static int __init maxtcs(char *str)
38 get_option(&str, &tclimit);
43 __setup("maxtcs=", maxtcs);
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.
50 void mips_mt_regdump(unsigned long mvpctl)
53 unsigned long vpflags;
54 unsigned long mvpconf0;
59 unsigned long haltval;
60 unsigned long tcstatval;
61 #ifdef CONFIG_MIPS_MT_SMTC
62 void smtc_soft_dump(void);
63 #endif /* CONFIG_MIPT_MT_SMTC */
65 local_irq_save(flags);
67 printk("=== MIPS MT State Dump ===\n");
68 printk("-- Global State --\n");
69 printk(" MVPControl Passed: %08lx\n", mvpctl);
70 printk(" MVPControl Read: %08lx\n", vpflags);
71 printk(" MVPConf0 : %08lx\n", (mvpconf0 = read_c0_mvpconf0()));
72 nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
73 ntc = ((mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT) + 1;
74 printk("-- per-VPE State --\n");
75 for (i = 0; i < nvpe; i++) {
76 for (tc = 0; tc < ntc; tc++) {
78 if ((read_tc_c0_tcbind() & TCBIND_CURVPE) == i) {
79 printk(" VPE %d\n", i);
80 printk(" VPEControl : %08lx\n",
81 read_vpe_c0_vpecontrol());
82 printk(" VPEConf0 : %08lx\n",
83 read_vpe_c0_vpeconf0());
84 printk(" VPE%d.Status : %08lx\n",
85 i, read_vpe_c0_status());
86 printk(" VPE%d.EPC : %08lx %pS\n",
88 (void *) read_vpe_c0_epc());
89 printk(" VPE%d.Cause : %08lx\n",
90 i, read_vpe_c0_cause());
91 printk(" VPE%d.Config7 : %08lx\n",
92 i, read_vpe_c0_config7());
97 printk("-- per-TC State --\n");
98 for (tc = 0; tc < ntc; tc++) {
100 if (read_tc_c0_tcbind() == read_c0_tcbind()) {
101 /* Are we dumping ourself? */
102 haltval = 0; /* Then we're not halted, and mustn't be */
103 tcstatval = flags; /* And pre-dump TCStatus is flags */
104 printk(" TC %d (current TC with VPE EPC above)\n", tc);
106 haltval = read_tc_c0_tchalt();
107 write_tc_c0_tchalt(1);
108 tcstatval = read_tc_c0_tcstatus();
109 printk(" TC %d\n", tc);
111 printk(" TCStatus : %08lx\n", tcstatval);
112 printk(" TCBind : %08lx\n", read_tc_c0_tcbind());
113 printk(" TCRestart : %08lx %pS\n",
114 read_tc_c0_tcrestart(), (void *) read_tc_c0_tcrestart());
115 printk(" TCHalt : %08lx\n", haltval);
116 printk(" TCContext : %08lx\n", read_tc_c0_tccontext());
118 write_tc_c0_tchalt(0);
120 #ifdef CONFIG_MIPS_MT_SMTC
122 #endif /* CONFIG_MIPT_MT_SMTC */
123 printk("===========================\n");
125 local_irq_restore(flags);
128 static int mt_opt_norps = 0;
129 static int mt_opt_rpsctl = -1;
130 static int mt_opt_nblsu = -1;
131 static int mt_opt_forceconfig7 = 0;
132 static int mt_opt_config7 = -1;
134 static int __init rps_disable(char *s)
139 __setup("norps", rps_disable);
141 static int __init rpsctl_set(char *str)
143 get_option(&str, &mt_opt_rpsctl);
146 __setup("rpsctl=", rpsctl_set);
148 static int __init nblsu_set(char *str)
150 get_option(&str, &mt_opt_nblsu);
153 __setup("nblsu=", nblsu_set);
155 static int __init config7_set(char *str)
157 get_option(&str, &mt_opt_config7);
158 mt_opt_forceconfig7 = 1;
161 __setup("config7=", config7_set);
163 /* Experimental cache flush control parameters that should go away some day */
164 int mt_protiflush = 0;
165 int mt_protdflush = 0;
166 int mt_n_iflushes = 1;
167 int mt_n_dflushes = 1;
169 static int __init set_protiflush(char *s)
174 __setup("protiflush", set_protiflush);
176 static int __init set_protdflush(char *s)
181 __setup("protdflush", set_protdflush);
183 static int __init niflush(char *s)
185 get_option(&s, &mt_n_iflushes);
188 __setup("niflush=", niflush);
190 static int __init ndflush(char *s)
192 get_option(&s, &mt_n_dflushes);
195 __setup("ndflush=", ndflush);
197 static unsigned int itc_base = 0;
199 static int __init set_itc_base(char *str)
201 get_option(&str, &itc_base);
205 __setup("itcbase=", set_itc_base);
207 void mips_mt_set_cpuoptions(void)
209 unsigned int oconfig7 = read_c0_config7();
210 unsigned int nconfig7 = oconfig7;
213 printk("\"norps\" option deprectated: use \"rpsctl=\"\n");
215 if (mt_opt_rpsctl >= 0) {
216 printk("34K return prediction stack override set to %d.\n",
219 nconfig7 |= (1 << 2);
221 nconfig7 &= ~(1 << 2);
223 if (mt_opt_nblsu >= 0) {
224 printk("34K ALU/LSU sync override set to %d.\n", mt_opt_nblsu);
226 nconfig7 |= (1 << 5);
228 nconfig7 &= ~(1 << 5);
230 if (mt_opt_forceconfig7) {
231 printk("CP0.Config7 forced to 0x%08x.\n", mt_opt_config7);
232 nconfig7 = mt_opt_config7;
234 if (oconfig7 != nconfig7) {
235 __asm__ __volatile("sync");
236 write_c0_config7(nconfig7);
238 printk("Config7: 0x%08x\n", read_c0_config7());
241 /* Report Cache management debug options */
243 printk("I-cache flushes single-threaded\n");
245 printk("D-cache flushes single-threaded\n");
246 if (mt_n_iflushes != 1)
247 printk("I-Cache Flushes Repeated %d times\n", mt_n_iflushes);
248 if (mt_n_dflushes != 1)
249 printk("D-Cache Flushes Repeated %d times\n", mt_n_dflushes);
253 * Configure ITC mapping. This code is very
254 * specific to the 34K core family, which uses
255 * a special mode bit ("ITC") in the ErrCtl
256 * register to enable access to ITC control
257 * registers via cache "tag" operations.
259 unsigned long ectlval;
260 unsigned long itcblkgrn;
262 /* ErrCtl register is known as "ecc" to Linux */
263 ectlval = read_c0_ecc();
264 write_c0_ecc(ectlval | (0x1 << 26));
266 #define INDEX_0 (0x80000000)
267 #define INDEX_8 (0x80000008)
268 /* Read "cache tag" for Dcache pseudo-index 8 */
269 cache_op(Index_Load_Tag_D, INDEX_8);
271 itcblkgrn = read_c0_dtaglo();
272 itcblkgrn &= 0xfffe0000;
273 /* Set for 128 byte pitch of ITC cells */
274 itcblkgrn |= 0x00000c00;
275 /* Stage in Tag register */
276 write_c0_dtaglo(itcblkgrn);
278 /* Write out to ITU with CACHE op */
279 cache_op(Index_Store_Tag_D, INDEX_8);
280 /* Now set base address, and turn ITC on with 0x1 bit */
281 write_c0_dtaglo((itc_base & 0xfffffc00) | 0x1 );
283 /* Write out to ITU with CACHE op */
284 cache_op(Index_Store_Tag_D, INDEX_0);
285 write_c0_ecc(ectlval);
287 printk("Mapped %ld ITC cells starting at 0x%08x\n",
288 ((itcblkgrn & 0x7fe00000) >> 20), itc_base);
293 * Function to protect cache flushes from concurrent execution
294 * depends on MP software model chosen.
297 void mt_cflush_lockdown(void)
299 #ifdef CONFIG_MIPS_MT_SMTC
300 void smtc_cflush_lockdown(void);
302 smtc_cflush_lockdown();
303 #endif /* CONFIG_MIPS_MT_SMTC */
304 /* FILL IN VSMP and AP/SP VERSIONS HERE */
307 void mt_cflush_release(void)
309 #ifdef CONFIG_MIPS_MT_SMTC
310 void smtc_cflush_release(void);
312 smtc_cflush_release();
313 #endif /* CONFIG_MIPS_MT_SMTC */
314 /* FILL IN VSMP and AP/SP VERSIONS HERE */
317 struct class *mt_class;
319 static int __init mt_init(void)
323 mtc = class_create(THIS_MODULE, "mt");
332 subsys_initcall(mt_init);