Loading...
1/*
2 * This program is free software; you can distribute it and/or modify it
3 * under the terms of the GNU General Public License (Version 2) as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
9 * for more details.
10 *
11 * You should have received a copy of the GNU General Public License along
12 * with this program; if not, write to the Free Software Foundation, Inc.,
13 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
14 *
15 * Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
16 * Elizabeth Clarke (beth@mips.com)
17 * Ralf Baechle (ralf@linux-mips.org)
18 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
19 */
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/cpumask.h>
23#include <linux/interrupt.h>
24#include <linux/compiler.h>
25#include <linux/smp.h>
26
27#include <linux/atomic.h>
28#include <asm/cacheflush.h>
29#include <asm/cpu.h>
30#include <asm/processor.h>
31#include <asm/hardirq.h>
32#include <asm/mmu_context.h>
33#include <asm/time.h>
34#include <asm/mipsregs.h>
35#include <asm/mipsmtregs.h>
36#include <asm/mips_mt.h>
37
38static void __init smvp_copy_vpe_config(void)
39{
40 write_vpe_c0_status(
41 (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
42
43 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
44 write_vpe_c0_config( read_c0_config());
45
46 /* make sure there are no software interrupts pending */
47 write_vpe_c0_cause(0);
48
49 /* Propagate Config7 */
50 write_vpe_c0_config7(read_c0_config7());
51
52 write_vpe_c0_count(read_c0_count());
53}
54
55static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
56 unsigned int ncpu)
57{
58 if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
59 return ncpu;
60
61 /* Deactivate all but VPE 0 */
62 if (tc != 0) {
63 unsigned long tmp = read_vpe_c0_vpeconf0();
64
65 tmp &= ~VPECONF0_VPA;
66
67 /* master VPE */
68 tmp |= VPECONF0_MVP;
69 write_vpe_c0_vpeconf0(tmp);
70
71 /* Record this as available CPU */
72 set_cpu_possible(tc, true);
73 __cpu_number_map[tc] = ++ncpu;
74 __cpu_logical_map[ncpu] = tc;
75 }
76
77 /* Disable multi-threading with TC's */
78 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
79
80 if (tc != 0)
81 smvp_copy_vpe_config();
82
83 return ncpu;
84}
85
86static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0)
87{
88 unsigned long tmp;
89
90 if (!tc)
91 return;
92
93 /* bind a TC to each VPE, May as well put all excess TC's
94 on the last VPE */
95 if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
96 write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
97 else {
98 write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
99
100 /* and set XTC */
101 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
102 }
103
104 tmp = read_tc_c0_tcstatus();
105
106 /* mark not allocated and not dynamically allocatable */
107 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
108 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
109 write_tc_c0_tcstatus(tmp);
110
111 write_tc_c0_tchalt(TCHALT_H);
112}
113
114static void vsmp_send_ipi_single(int cpu, unsigned int action)
115{
116 int i;
117 unsigned long flags;
118 int vpflags;
119
120 local_irq_save(flags);
121
122 vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */
123
124 switch (action) {
125 case SMP_CALL_FUNCTION:
126 i = C_SW1;
127 break;
128
129 case SMP_RESCHEDULE_YOURSELF:
130 default:
131 i = C_SW0;
132 break;
133 }
134
135 /* 1:1 mapping of vpe and tc... */
136 settc(cpu);
137 write_vpe_c0_cause(read_vpe_c0_cause() | i);
138 evpe(vpflags);
139
140 local_irq_restore(flags);
141}
142
143static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
144{
145 unsigned int i;
146
147 for_each_cpu(i, mask)
148 vsmp_send_ipi_single(i, action);
149}
150
151static void __cpuinit vsmp_init_secondary(void)
152{
153 extern int gic_present;
154
155 /* This is Malta specific: IPI,performance and timer interrupts */
156 if (gic_present)
157 change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 |
158 STATUSF_IP6 | STATUSF_IP7);
159 else
160 change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
161 STATUSF_IP6 | STATUSF_IP7);
162}
163
164static void __cpuinit vsmp_smp_finish(void)
165{
166 /* CDFIXME: remove this? */
167 write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
168
169#ifdef CONFIG_MIPS_MT_FPAFF
170 /* If we have an FPU, enroll ourselves in the FPU-full mask */
171 if (cpu_has_fpu)
172 cpu_set(smp_processor_id(), mt_fpu_cpumask);
173#endif /* CONFIG_MIPS_MT_FPAFF */
174
175 local_irq_enable();
176}
177
178static void vsmp_cpus_done(void)
179{
180}
181
182/*
183 * Setup the PC, SP, and GP of a secondary processor and start it
184 * running!
185 * smp_bootstrap is the place to resume from
186 * __KSTK_TOS(idle) is apparently the stack pointer
187 * (unsigned long)idle->thread_info the gp
188 * assumes a 1:1 mapping of TC => VPE
189 */
190static void __cpuinit vsmp_boot_secondary(int cpu, struct task_struct *idle)
191{
192 struct thread_info *gp = task_thread_info(idle);
193 dvpe();
194 set_c0_mvpcontrol(MVPCONTROL_VPC);
195
196 settc(cpu);
197
198 /* restart */
199 write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
200
201 /* enable the tc this vpe/cpu will be running */
202 write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
203
204 write_tc_c0_tchalt(0);
205
206 /* enable the VPE */
207 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
208
209 /* stack pointer */
210 write_tc_gpr_sp( __KSTK_TOS(idle));
211
212 /* global pointer */
213 write_tc_gpr_gp((unsigned long)gp);
214
215 flush_icache_range((unsigned long)gp,
216 (unsigned long)(gp + sizeof(struct thread_info)));
217
218 /* finally out of configuration and into chaos */
219 clear_c0_mvpcontrol(MVPCONTROL_VPC);
220
221 evpe(EVPE_ENABLE);
222}
223
224/*
225 * Common setup before any secondaries are started
226 * Make sure all CPU's are in a sensible state before we boot any of the
227 * secondaries
228 */
229static void __init vsmp_smp_setup(void)
230{
231 unsigned int mvpconf0, ntc, tc, ncpu = 0;
232 unsigned int nvpe;
233
234#ifdef CONFIG_MIPS_MT_FPAFF
235 /* If we have an FPU, enroll ourselves in the FPU-full mask */
236 if (cpu_has_fpu)
237 cpu_set(0, mt_fpu_cpumask);
238#endif /* CONFIG_MIPS_MT_FPAFF */
239 if (!cpu_has_mipsmt)
240 return;
241
242 /* disable MT so we can configure */
243 dvpe();
244 dmt();
245
246 /* Put MVPE's into 'configuration state' */
247 set_c0_mvpcontrol(MVPCONTROL_VPC);
248
249 mvpconf0 = read_c0_mvpconf0();
250 ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
251
252 nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
253 smp_num_siblings = nvpe;
254
255 /* we'll always have more TC's than VPE's, so loop setting everything
256 to a sensible state */
257 for (tc = 0; tc <= ntc; tc++) {
258 settc(tc);
259
260 smvp_tc_init(tc, mvpconf0);
261 ncpu = smvp_vpe_init(tc, mvpconf0, ncpu);
262 }
263
264 /* Release config state */
265 clear_c0_mvpcontrol(MVPCONTROL_VPC);
266
267 /* We'll wait until starting the secondaries before starting MVPE */
268
269 printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
270}
271
272static void __init vsmp_prepare_cpus(unsigned int max_cpus)
273{
274 mips_mt_set_cpuoptions();
275}
276
277struct plat_smp_ops vsmp_smp_ops = {
278 .send_ipi_single = vsmp_send_ipi_single,
279 .send_ipi_mask = vsmp_send_ipi_mask,
280 .init_secondary = vsmp_init_secondary,
281 .smp_finish = vsmp_smp_finish,
282 .cpus_done = vsmp_cpus_done,
283 .boot_secondary = vsmp_boot_secondary,
284 .smp_setup = vsmp_smp_setup,
285 .prepare_cpus = vsmp_prepare_cpus,
286};
1/*
2 * This program is free software; you can distribute it and/or modify it
3 * under the terms of the GNU General Public License (Version 2) as
4 * published by the Free Software Foundation.
5 *
6 * This program is distributed in the hope it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
9 * for more details.
10 *
11 * You should have received a copy of the GNU General Public License along
12 * with this program; if not, write to the Free Software Foundation, Inc.,
13 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
14 *
15 * Copyright (C) 2004, 05, 06 MIPS Technologies, Inc.
16 * Elizabeth Clarke (beth@mips.com)
17 * Ralf Baechle (ralf@linux-mips.org)
18 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
19 */
20#include <linux/kernel.h>
21#include <linux/sched.h>
22#include <linux/cpumask.h>
23#include <linux/interrupt.h>
24#include <linux/compiler.h>
25#include <linux/smp.h>
26
27#include <linux/atomic.h>
28#include <asm/cacheflush.h>
29#include <asm/cpu.h>
30#include <asm/processor.h>
31#include <asm/hardirq.h>
32#include <asm/mmu_context.h>
33#include <asm/time.h>
34#include <asm/mipsregs.h>
35#include <asm/mipsmtregs.h>
36#include <asm/mips_mt.h>
37#include <asm/gic.h>
38
39static void __init smvp_copy_vpe_config(void)
40{
41 write_vpe_c0_status(
42 (read_c0_status() & ~(ST0_IM | ST0_IE | ST0_KSU)) | ST0_CU0);
43
44 /* set config to be the same as vpe0, particularly kseg0 coherency alg */
45 write_vpe_c0_config( read_c0_config());
46
47 /* make sure there are no software interrupts pending */
48 write_vpe_c0_cause(0);
49
50 /* Propagate Config7 */
51 write_vpe_c0_config7(read_c0_config7());
52
53 write_vpe_c0_count(read_c0_count());
54}
55
56static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
57 unsigned int ncpu)
58{
59 if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
60 return ncpu;
61
62 /* Deactivate all but VPE 0 */
63 if (tc != 0) {
64 unsigned long tmp = read_vpe_c0_vpeconf0();
65
66 tmp &= ~VPECONF0_VPA;
67
68 /* master VPE */
69 tmp |= VPECONF0_MVP;
70 write_vpe_c0_vpeconf0(tmp);
71
72 /* Record this as available CPU */
73 set_cpu_possible(tc, true);
74 set_cpu_present(tc, true);
75 __cpu_number_map[tc] = ++ncpu;
76 __cpu_logical_map[ncpu] = tc;
77 }
78
79 /* Disable multi-threading with TC's */
80 write_vpe_c0_vpecontrol(read_vpe_c0_vpecontrol() & ~VPECONTROL_TE);
81
82 if (tc != 0)
83 smvp_copy_vpe_config();
84
85 return ncpu;
86}
87
88static void __init smvp_tc_init(unsigned int tc, unsigned int mvpconf0)
89{
90 unsigned long tmp;
91
92 if (!tc)
93 return;
94
95 /* bind a TC to each VPE, May as well put all excess TC's
96 on the last VPE */
97 if (tc >= (((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)+1))
98 write_tc_c0_tcbind(read_tc_c0_tcbind() | ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT));
99 else {
100 write_tc_c0_tcbind(read_tc_c0_tcbind() | tc);
101
102 /* and set XTC */
103 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | (tc << VPECONF0_XTC_SHIFT));
104 }
105
106 tmp = read_tc_c0_tcstatus();
107
108 /* mark not allocated and not dynamically allocatable */
109 tmp &= ~(TCSTATUS_A | TCSTATUS_DA);
110 tmp |= TCSTATUS_IXMT; /* interrupt exempt */
111 write_tc_c0_tcstatus(tmp);
112
113 write_tc_c0_tchalt(TCHALT_H);
114}
115
116static void vsmp_send_ipi_single(int cpu, unsigned int action)
117{
118 int i;
119 unsigned long flags;
120 int vpflags;
121
122#ifdef CONFIG_IRQ_GIC
123 if (gic_present) {
124 gic_send_ipi_single(cpu, action);
125 return;
126 }
127#endif
128 local_irq_save(flags);
129
130 vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */
131
132 switch (action) {
133 case SMP_CALL_FUNCTION:
134 i = C_SW1;
135 break;
136
137 case SMP_RESCHEDULE_YOURSELF:
138 default:
139 i = C_SW0;
140 break;
141 }
142
143 /* 1:1 mapping of vpe and tc... */
144 settc(cpu);
145 write_vpe_c0_cause(read_vpe_c0_cause() | i);
146 evpe(vpflags);
147
148 local_irq_restore(flags);
149}
150
151static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
152{
153 unsigned int i;
154
155 for_each_cpu(i, mask)
156 vsmp_send_ipi_single(i, action);
157}
158
159static void vsmp_init_secondary(void)
160{
161#ifdef CONFIG_IRQ_GIC
162 /* This is Malta specific: IPI,performance and timer interrupts */
163 if (gic_present)
164 change_c0_status(ST0_IM, STATUSF_IP3 | STATUSF_IP4 |
165 STATUSF_IP6 | STATUSF_IP7);
166 else
167#endif
168 change_c0_status(ST0_IM, STATUSF_IP0 | STATUSF_IP1 |
169 STATUSF_IP6 | STATUSF_IP7);
170}
171
172static void vsmp_smp_finish(void)
173{
174 /* CDFIXME: remove this? */
175 write_c0_compare(read_c0_count() + (8* mips_hpt_frequency/HZ));
176
177#ifdef CONFIG_MIPS_MT_FPAFF
178 /* If we have an FPU, enroll ourselves in the FPU-full mask */
179 if (cpu_has_fpu)
180 cpu_set(smp_processor_id(), mt_fpu_cpumask);
181#endif /* CONFIG_MIPS_MT_FPAFF */
182
183 local_irq_enable();
184}
185
186static void vsmp_cpus_done(void)
187{
188}
189
190/*
191 * Setup the PC, SP, and GP of a secondary processor and start it
192 * running!
193 * smp_bootstrap is the place to resume from
194 * __KSTK_TOS(idle) is apparently the stack pointer
195 * (unsigned long)idle->thread_info the gp
196 * assumes a 1:1 mapping of TC => VPE
197 */
198static void vsmp_boot_secondary(int cpu, struct task_struct *idle)
199{
200 struct thread_info *gp = task_thread_info(idle);
201 dvpe();
202 set_c0_mvpcontrol(MVPCONTROL_VPC);
203
204 settc(cpu);
205
206 /* restart */
207 write_tc_c0_tcrestart((unsigned long)&smp_bootstrap);
208
209 /* enable the tc this vpe/cpu will be running */
210 write_tc_c0_tcstatus((read_tc_c0_tcstatus() & ~TCSTATUS_IXMT) | TCSTATUS_A);
211
212 write_tc_c0_tchalt(0);
213
214 /* enable the VPE */
215 write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() | VPECONF0_VPA);
216
217 /* stack pointer */
218 write_tc_gpr_sp( __KSTK_TOS(idle));
219
220 /* global pointer */
221 write_tc_gpr_gp((unsigned long)gp);
222
223 flush_icache_range((unsigned long)gp,
224 (unsigned long)(gp + sizeof(struct thread_info)));
225
226 /* finally out of configuration and into chaos */
227 clear_c0_mvpcontrol(MVPCONTROL_VPC);
228
229 evpe(EVPE_ENABLE);
230}
231
232/*
233 * Common setup before any secondaries are started
234 * Make sure all CPU's are in a sensible state before we boot any of the
235 * secondaries
236 */
237static void __init vsmp_smp_setup(void)
238{
239 unsigned int mvpconf0, ntc, tc, ncpu = 0;
240 unsigned int nvpe;
241
242#ifdef CONFIG_MIPS_MT_FPAFF
243 /* If we have an FPU, enroll ourselves in the FPU-full mask */
244 if (cpu_has_fpu)
245 cpu_set(0, mt_fpu_cpumask);
246#endif /* CONFIG_MIPS_MT_FPAFF */
247 if (!cpu_has_mipsmt)
248 return;
249
250 /* disable MT so we can configure */
251 dvpe();
252 dmt();
253
254 /* Put MVPE's into 'configuration state' */
255 set_c0_mvpcontrol(MVPCONTROL_VPC);
256
257 mvpconf0 = read_c0_mvpconf0();
258 ntc = (mvpconf0 & MVPCONF0_PTC) >> MVPCONF0_PTC_SHIFT;
259
260 nvpe = ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT) + 1;
261 smp_num_siblings = nvpe;
262
263 /* we'll always have more TC's than VPE's, so loop setting everything
264 to a sensible state */
265 for (tc = 0; tc <= ntc; tc++) {
266 settc(tc);
267
268 smvp_tc_init(tc, mvpconf0);
269 ncpu = smvp_vpe_init(tc, mvpconf0, ncpu);
270 }
271
272 /* Release config state */
273 clear_c0_mvpcontrol(MVPCONTROL_VPC);
274
275 /* We'll wait until starting the secondaries before starting MVPE */
276
277 printk(KERN_INFO "Detected %i available secondary CPU(s)\n", ncpu);
278}
279
280static void __init vsmp_prepare_cpus(unsigned int max_cpus)
281{
282 mips_mt_set_cpuoptions();
283}
284
285struct plat_smp_ops vsmp_smp_ops = {
286 .send_ipi_single = vsmp_send_ipi_single,
287 .send_ipi_mask = vsmp_send_ipi_mask,
288 .init_secondary = vsmp_init_secondary,
289 .smp_finish = vsmp_smp_finish,
290 .cpus_done = vsmp_cpus_done,
291 .boot_secondary = vsmp_boot_secondary,
292 .smp_setup = vsmp_smp_setup,
293 .prepare_cpus = vsmp_prepare_cpus,
294};
295
296static int proc_cpuinfo_chain_call(struct notifier_block *nfb,
297 unsigned long action_unused, void *data)
298{
299 struct proc_cpuinfo_notifier_args *pcn = data;
300 struct seq_file *m = pcn->m;
301 unsigned long n = pcn->n;
302
303 if (!cpu_has_mipsmt)
304 return NOTIFY_OK;
305
306 seq_printf(m, "VPE\t\t\t: %d\n", cpu_data[n].vpe_id);
307
308 return NOTIFY_OK;
309}
310
311static int __init proc_cpuinfo_notifier_init(void)
312{
313 return proc_cpuinfo_notifier(proc_cpuinfo_chain_call, 0);
314}
315
316subsys_initcall(proc_cpuinfo_notifier_init);