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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * sun4m SMP support.
4 *
5 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8#include <linux/clockchips.h>
9#include <linux/interrupt.h>
10#include <linux/profile.h>
11#include <linux/delay.h>
12#include <linux/sched/mm.h>
13#include <linux/cpu.h>
14
15#include <asm/cacheflush.h>
16#include <asm/switch_to.h>
17#include <asm/tlbflush.h>
18#include <asm/timer.h>
19#include <asm/oplib.h>
20
21#include "irq.h"
22#include "kernel.h"
23
24#define IRQ_IPI_SINGLE 12
25#define IRQ_IPI_MASK 13
26#define IRQ_IPI_RESCHED 14
27#define IRQ_CROSS_CALL 15
28
29static inline unsigned long
30swap_ulong(volatile unsigned long *ptr, unsigned long val)
31{
32 __asm__ __volatile__("swap [%1], %0\n\t" :
33 "=&r" (val), "=&r" (ptr) :
34 "0" (val), "1" (ptr));
35 return val;
36}
37
38void sun4m_cpu_pre_starting(void *arg)
39{
40}
41
42void sun4m_cpu_pre_online(void *arg)
43{
44 int cpuid = hard_smp_processor_id();
45
46 /* Allow master to continue. The master will then give us the
47 * go-ahead by setting the smp_commenced_mask and will wait without
48 * timeouts until our setup is completed fully (signified by
49 * our bit being set in the cpu_online_mask).
50 */
51 swap_ulong(&cpu_callin_map[cpuid], 1);
52
53 /* XXX: What's up with all the flushes? */
54 local_ops->cache_all();
55 local_ops->tlb_all();
56
57 /* Fix idle thread fields. */
58 __asm__ __volatile__("ld [%0], %%g6\n\t"
59 : : "r" (¤t_set[cpuid])
60 : "memory" /* paranoid */);
61
62 /* Attach to the address space of init_task. */
63 mmgrab(&init_mm);
64 current->active_mm = &init_mm;
65
66 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
67 mb();
68}
69
70/*
71 * Cycle through the processors asking the PROM to start each one.
72 */
73void __init smp4m_boot_cpus(void)
74{
75 sun4m_unmask_profile_irq();
76 local_ops->cache_all();
77}
78
79int smp4m_boot_one_cpu(int i, struct task_struct *idle)
80{
81 unsigned long *entry = &sun4m_cpu_startup;
82 int timeout;
83 int cpu_node;
84
85 cpu_find_by_mid(i, &cpu_node);
86 current_set[i] = task_thread_info(idle);
87
88 /* See trampoline.S for details... */
89 entry += ((i - 1) * 3);
90
91 /*
92 * Initialize the contexts table
93 * Since the call to prom_startcpu() trashes the structure,
94 * we need to re-initialize it for each cpu
95 */
96 smp_penguin_ctable.which_io = 0;
97 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
98 smp_penguin_ctable.reg_size = 0;
99
100 /* whirrr, whirrr, whirrrrrrrrr... */
101 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
102 local_ops->cache_all();
103 prom_startcpu(cpu_node, &smp_penguin_ctable, 0, (char *)entry);
104
105 /* wheee... it's going... */
106 for (timeout = 0; timeout < 10000; timeout++) {
107 if (cpu_callin_map[i])
108 break;
109 udelay(200);
110 }
111
112 if (!(cpu_callin_map[i])) {
113 printk(KERN_ERR "Processor %d is stuck.\n", i);
114 return -ENODEV;
115 }
116
117 local_ops->cache_all();
118 return 0;
119}
120
121void __init smp4m_smp_done(void)
122{
123 int i, first;
124 int *prev;
125
126 /* setup cpu list for irq rotation */
127 first = 0;
128 prev = &first;
129 for_each_online_cpu(i) {
130 *prev = i;
131 prev = &cpu_data(i).next;
132 }
133 *prev = first;
134 local_ops->cache_all();
135
136 /* Ok, they are spinning and ready to go. */
137}
138
139static void sun4m_send_ipi(int cpu, int level)
140{
141 sbus_writel(SUN4M_SOFT_INT(level), &sun4m_irq_percpu[cpu]->set);
142}
143
144static void sun4m_ipi_resched(int cpu)
145{
146 sun4m_send_ipi(cpu, IRQ_IPI_RESCHED);
147}
148
149static void sun4m_ipi_single(int cpu)
150{
151 sun4m_send_ipi(cpu, IRQ_IPI_SINGLE);
152}
153
154static void sun4m_ipi_mask_one(int cpu)
155{
156 sun4m_send_ipi(cpu, IRQ_IPI_MASK);
157}
158
159static struct smp_funcall {
160 smpfunc_t func;
161 unsigned long arg1;
162 unsigned long arg2;
163 unsigned long arg3;
164 unsigned long arg4;
165 unsigned long arg5;
166 unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */
167 unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
168} ccall_info;
169
170static DEFINE_SPINLOCK(cross_call_lock);
171
172/* Cross calls must be serialized, at least currently. */
173static void sun4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
174 unsigned long arg2, unsigned long arg3,
175 unsigned long arg4)
176{
177 register int ncpus = SUN4M_NCPUS;
178 unsigned long flags;
179
180 spin_lock_irqsave(&cross_call_lock, flags);
181
182 /* Init function glue. */
183 ccall_info.func = func;
184 ccall_info.arg1 = arg1;
185 ccall_info.arg2 = arg2;
186 ccall_info.arg3 = arg3;
187 ccall_info.arg4 = arg4;
188 ccall_info.arg5 = 0;
189
190 /* Init receive/complete mapping, plus fire the IPI's off. */
191 {
192 register int i;
193
194 cpumask_clear_cpu(smp_processor_id(), &mask);
195 cpumask_and(&mask, cpu_online_mask, &mask);
196 for (i = 0; i < ncpus; i++) {
197 if (cpumask_test_cpu(i, &mask)) {
198 ccall_info.processors_in[i] = 0;
199 ccall_info.processors_out[i] = 0;
200 sun4m_send_ipi(i, IRQ_CROSS_CALL);
201 } else {
202 ccall_info.processors_in[i] = 1;
203 ccall_info.processors_out[i] = 1;
204 }
205 }
206 }
207
208 {
209 register int i;
210
211 i = 0;
212 do {
213 if (!cpumask_test_cpu(i, &mask))
214 continue;
215 while (!ccall_info.processors_in[i])
216 barrier();
217 } while (++i < ncpus);
218
219 i = 0;
220 do {
221 if (!cpumask_test_cpu(i, &mask))
222 continue;
223 while (!ccall_info.processors_out[i])
224 barrier();
225 } while (++i < ncpus);
226 }
227 spin_unlock_irqrestore(&cross_call_lock, flags);
228}
229
230/* Running cross calls. */
231void smp4m_cross_call_irq(void)
232{
233 int i = smp_processor_id();
234
235 ccall_info.processors_in[i] = 1;
236 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
237 ccall_info.arg4, ccall_info.arg5);
238 ccall_info.processors_out[i] = 1;
239}
240
241void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
242{
243 struct pt_regs *old_regs;
244 struct clock_event_device *ce;
245 int cpu = smp_processor_id();
246
247 old_regs = set_irq_regs(regs);
248
249 ce = &per_cpu(sparc32_clockevent, cpu);
250
251 if (clockevent_state_periodic(ce))
252 sun4m_clear_profile_irq(cpu);
253 else
254 sparc_config.load_profile_irq(cpu, 0); /* Is this needless? */
255
256 irq_enter();
257 ce->event_handler(ce);
258 irq_exit();
259
260 set_irq_regs(old_regs);
261}
262
263static const struct sparc32_ipi_ops sun4m_ipi_ops = {
264 .cross_call = sun4m_cross_call,
265 .resched = sun4m_ipi_resched,
266 .single = sun4m_ipi_single,
267 .mask_one = sun4m_ipi_mask_one,
268};
269
270void __init sun4m_init_smp(void)
271{
272 sparc32_ipi_ops = &sun4m_ipi_ops;
273}
1/*
2 * sun4m SMP support.
3 *
4 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
5 */
6
7#include <linux/interrupt.h>
8#include <linux/profile.h>
9#include <linux/delay.h>
10#include <linux/cpu.h>
11
12#include <asm/cacheflush.h>
13#include <asm/tlbflush.h>
14
15#include "irq.h"
16#include "kernel.h"
17
18#define IRQ_IPI_SINGLE 12
19#define IRQ_IPI_MASK 13
20#define IRQ_IPI_RESCHED 14
21#define IRQ_CROSS_CALL 15
22
23static inline unsigned long
24swap_ulong(volatile unsigned long *ptr, unsigned long val)
25{
26 __asm__ __volatile__("swap [%1], %0\n\t" :
27 "=&r" (val), "=&r" (ptr) :
28 "0" (val), "1" (ptr));
29 return val;
30}
31
32static void smp4m_ipi_init(void);
33static void smp_setup_percpu_timer(void);
34
35void __cpuinit smp4m_callin(void)
36{
37 int cpuid = hard_smp_processor_id();
38
39 local_flush_cache_all();
40 local_flush_tlb_all();
41
42 notify_cpu_starting(cpuid);
43
44 /* Get our local ticker going. */
45 smp_setup_percpu_timer();
46
47 calibrate_delay();
48 smp_store_cpu_info(cpuid);
49
50 local_flush_cache_all();
51 local_flush_tlb_all();
52
53 /*
54 * Unblock the master CPU _only_ when the scheduler state
55 * of all secondary CPUs will be up-to-date, so after
56 * the SMP initialization the master will be just allowed
57 * to call the scheduler code.
58 */
59 /* Allow master to continue. */
60 swap_ulong(&cpu_callin_map[cpuid], 1);
61
62 /* XXX: What's up with all the flushes? */
63 local_flush_cache_all();
64 local_flush_tlb_all();
65
66 /* Fix idle thread fields. */
67 __asm__ __volatile__("ld [%0], %%g6\n\t"
68 : : "r" (¤t_set[cpuid])
69 : "memory" /* paranoid */);
70
71 /* Attach to the address space of init_task. */
72 atomic_inc(&init_mm.mm_count);
73 current->active_mm = &init_mm;
74
75 while (!cpumask_test_cpu(cpuid, &smp_commenced_mask))
76 mb();
77
78 local_irq_enable();
79
80 set_cpu_online(cpuid, true);
81}
82
83/*
84 * Cycle through the processors asking the PROM to start each one.
85 */
86void __init smp4m_boot_cpus(void)
87{
88 smp4m_ipi_init();
89 smp_setup_percpu_timer();
90 local_flush_cache_all();
91}
92
93int __cpuinit smp4m_boot_one_cpu(int i)
94{
95 unsigned long *entry = &sun4m_cpu_startup;
96 struct task_struct *p;
97 int timeout;
98 int cpu_node;
99
100 cpu_find_by_mid(i, &cpu_node);
101
102 /* Cook up an idler for this guy. */
103 p = fork_idle(i);
104 current_set[i] = task_thread_info(p);
105 /* See trampoline.S for details... */
106 entry += ((i - 1) * 3);
107
108 /*
109 * Initialize the contexts table
110 * Since the call to prom_startcpu() trashes the structure,
111 * we need to re-initialize it for each cpu
112 */
113 smp_penguin_ctable.which_io = 0;
114 smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
115 smp_penguin_ctable.reg_size = 0;
116
117 /* whirrr, whirrr, whirrrrrrrrr... */
118 printk(KERN_INFO "Starting CPU %d at %p\n", i, entry);
119 local_flush_cache_all();
120 prom_startcpu(cpu_node, &smp_penguin_ctable, 0, (char *)entry);
121
122 /* wheee... it's going... */
123 for (timeout = 0; timeout < 10000; timeout++) {
124 if (cpu_callin_map[i])
125 break;
126 udelay(200);
127 }
128
129 if (!(cpu_callin_map[i])) {
130 printk(KERN_ERR "Processor %d is stuck.\n", i);
131 return -ENODEV;
132 }
133
134 local_flush_cache_all();
135 return 0;
136}
137
138void __init smp4m_smp_done(void)
139{
140 int i, first;
141 int *prev;
142
143 /* setup cpu list for irq rotation */
144 first = 0;
145 prev = &first;
146 for_each_online_cpu(i) {
147 *prev = i;
148 prev = &cpu_data(i).next;
149 }
150 *prev = first;
151 local_flush_cache_all();
152
153 /* Ok, they are spinning and ready to go. */
154}
155
156
157/* Initialize IPIs on the SUN4M SMP machine */
158static void __init smp4m_ipi_init(void)
159{
160}
161
162static void smp4m_ipi_resched(int cpu)
163{
164 set_cpu_int(cpu, IRQ_IPI_RESCHED);
165}
166
167static void smp4m_ipi_single(int cpu)
168{
169 set_cpu_int(cpu, IRQ_IPI_SINGLE);
170}
171
172static void smp4m_ipi_mask_one(int cpu)
173{
174 set_cpu_int(cpu, IRQ_IPI_MASK);
175}
176
177static struct smp_funcall {
178 smpfunc_t func;
179 unsigned long arg1;
180 unsigned long arg2;
181 unsigned long arg3;
182 unsigned long arg4;
183 unsigned long arg5;
184 unsigned long processors_in[SUN4M_NCPUS]; /* Set when ipi entered. */
185 unsigned long processors_out[SUN4M_NCPUS]; /* Set when ipi exited. */
186} ccall_info;
187
188static DEFINE_SPINLOCK(cross_call_lock);
189
190/* Cross calls must be serialized, at least currently. */
191static void smp4m_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
192 unsigned long arg2, unsigned long arg3,
193 unsigned long arg4)
194{
195 register int ncpus = SUN4M_NCPUS;
196 unsigned long flags;
197
198 spin_lock_irqsave(&cross_call_lock, flags);
199
200 /* Init function glue. */
201 ccall_info.func = func;
202 ccall_info.arg1 = arg1;
203 ccall_info.arg2 = arg2;
204 ccall_info.arg3 = arg3;
205 ccall_info.arg4 = arg4;
206 ccall_info.arg5 = 0;
207
208 /* Init receive/complete mapping, plus fire the IPI's off. */
209 {
210 register int i;
211
212 cpumask_clear_cpu(smp_processor_id(), &mask);
213 cpumask_and(&mask, cpu_online_mask, &mask);
214 for (i = 0; i < ncpus; i++) {
215 if (cpumask_test_cpu(i, &mask)) {
216 ccall_info.processors_in[i] = 0;
217 ccall_info.processors_out[i] = 0;
218 set_cpu_int(i, IRQ_CROSS_CALL);
219 } else {
220 ccall_info.processors_in[i] = 1;
221 ccall_info.processors_out[i] = 1;
222 }
223 }
224 }
225
226 {
227 register int i;
228
229 i = 0;
230 do {
231 if (!cpumask_test_cpu(i, &mask))
232 continue;
233 while (!ccall_info.processors_in[i])
234 barrier();
235 } while (++i < ncpus);
236
237 i = 0;
238 do {
239 if (!cpumask_test_cpu(i, &mask))
240 continue;
241 while (!ccall_info.processors_out[i])
242 barrier();
243 } while (++i < ncpus);
244 }
245 spin_unlock_irqrestore(&cross_call_lock, flags);
246}
247
248/* Running cross calls. */
249void smp4m_cross_call_irq(void)
250{
251 int i = smp_processor_id();
252
253 ccall_info.processors_in[i] = 1;
254 ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
255 ccall_info.arg4, ccall_info.arg5);
256 ccall_info.processors_out[i] = 1;
257}
258
259void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
260{
261 struct pt_regs *old_regs;
262 int cpu = smp_processor_id();
263
264 old_regs = set_irq_regs(regs);
265
266 sun4m_clear_profile_irq(cpu);
267
268 profile_tick(CPU_PROFILING);
269
270 if (!--prof_counter(cpu)) {
271 int user = user_mode(regs);
272
273 irq_enter();
274 update_process_times(user);
275 irq_exit();
276
277 prof_counter(cpu) = prof_multiplier(cpu);
278 }
279 set_irq_regs(old_regs);
280}
281
282static void __cpuinit smp_setup_percpu_timer(void)
283{
284 int cpu = smp_processor_id();
285
286 prof_counter(cpu) = prof_multiplier(cpu) = 1;
287 load_profile_irq(cpu, lvl14_resolution);
288
289 if (cpu == boot_cpu_id)
290 sun4m_unmask_profile_irq();
291}
292
293static void __init smp4m_blackbox_id(unsigned *addr)
294{
295 int rd = *addr & 0x3e000000;
296 int rs1 = rd >> 11;
297
298 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */
299 addr[1] = 0x8130200c | rd | rs1; /* srl reg, 0xc, reg */
300 addr[2] = 0x80082003 | rd | rs1; /* and reg, 3, reg */
301}
302
303static void __init smp4m_blackbox_current(unsigned *addr)
304{
305 int rd = *addr & 0x3e000000;
306 int rs1 = rd >> 11;
307
308 addr[0] = 0x81580000 | rd; /* rd %tbr, reg */
309 addr[2] = 0x8130200a | rd | rs1; /* srl reg, 0xa, reg */
310 addr[4] = 0x8008200c | rd | rs1; /* and reg, 0xc, reg */
311}
312
313void __init sun4m_init_smp(void)
314{
315 BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
316 BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
317 BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
318 BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
319 BTFIXUPSET_CALL(smp_ipi_resched, smp4m_ipi_resched, BTFIXUPCALL_NORM);
320 BTFIXUPSET_CALL(smp_ipi_single, smp4m_ipi_single, BTFIXUPCALL_NORM);
321 BTFIXUPSET_CALL(smp_ipi_mask_one, smp4m_ipi_mask_one, BTFIXUPCALL_NORM);
322}