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8#include <linux/cpu.h>
9#include <linux/init.h>
10#include <linux/delay.h>
11#include <linux/smp.h>
12#include <linux/interrupt.h>
13#include <linux/kernel_stat.h>
14#include <linux/sched.h>
15#include <linux/module.h>
16
17#include <asm/mmu_context.h>
18#include <asm/system.h>
19#include <asm/time.h>
20
21#include <asm/octeon/octeon.h>
22
23#include "octeon_boot.h"
24
25volatile unsigned long octeon_processor_boot = 0xff;
26volatile unsigned long octeon_processor_sp;
27volatile unsigned long octeon_processor_gp;
28
29#ifdef CONFIG_HOTPLUG_CPU
30uint64_t octeon_bootloader_entry_addr;
31EXPORT_SYMBOL(octeon_bootloader_entry_addr);
32#endif
33
34static irqreturn_t mailbox_interrupt(int irq, void *dev_id)
35{
36 const int coreid = cvmx_get_core_num();
37 uint64_t action;
38
39
40 action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid));
41
42
43 cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action);
44
45 if (action & SMP_CALL_FUNCTION)
46 smp_call_function_interrupt();
47
48
49 if (action & SMP_ICACHE_FLUSH)
50 asm volatile ("synci 0($0)\n");
51 return IRQ_HANDLED;
52}
53
54
55
56
57
58
59void octeon_send_ipi_single(int cpu, unsigned int action)
60{
61 int coreid = cpu_logical_map(cpu);
62
63
64
65
66 cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
67}
68
69static inline void octeon_send_ipi_mask(const struct cpumask *mask,
70 unsigned int action)
71{
72 unsigned int i;
73
74 for_each_cpu_mask(i, *mask)
75 octeon_send_ipi_single(i, action);
76}
77
78
79
80
81static void octeon_smp_hotplug_setup(void)
82{
83#ifdef CONFIG_HOTPLUG_CPU
84 struct linux_app_boot_info *labi;
85
86 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
87 if (labi->labi_signature != LABI_SIGNATURE)
88 panic("The bootloader version on this board is incorrect.");
89
90 octeon_bootloader_entry_addr = labi->InitTLBStart_addr;
91#endif
92}
93
94static void octeon_smp_setup(void)
95{
96 const int coreid = cvmx_get_core_num();
97 int cpus;
98 int id;
99 int core_mask = octeon_get_boot_coremask();
100#ifdef CONFIG_HOTPLUG_CPU
101 unsigned int num_cores = cvmx_octeon_num_cores();
102#endif
103
104
105 for (id = 0; id < NR_CPUS; id++) {
106 set_cpu_possible(id, id == 0);
107 set_cpu_present(id, id == 0);
108 }
109
110 __cpu_number_map[coreid] = 0;
111 __cpu_logical_map[0] = coreid;
112
113
114 cpus = 1;
115 for (id = 0; id < NR_CPUS; id++) {
116 if ((id != coreid) && (core_mask & (1 << id))) {
117 set_cpu_possible(cpus, true);
118 set_cpu_present(cpus, true);
119 __cpu_number_map[id] = cpus;
120 __cpu_logical_map[cpus] = id;
121 cpus++;
122 }
123 }
124
125#ifdef CONFIG_HOTPLUG_CPU
126
127
128
129
130
131 for (id = 0; id < num_cores && id < NR_CPUS; id++) {
132 if (!(core_mask & (1 << id))) {
133 set_cpu_possible(cpus, true);
134 __cpu_number_map[id] = cpus;
135 __cpu_logical_map[cpus] = id;
136 cpus++;
137 }
138 }
139#endif
140
141 octeon_smp_hotplug_setup();
142}
143
144
145
146
147
148static void octeon_boot_secondary(int cpu, struct task_struct *idle)
149{
150 int count;
151
152 pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
153 cpu_logical_map(cpu));
154
155 octeon_processor_sp = __KSTK_TOS(idle);
156 octeon_processor_gp = (unsigned long)(task_thread_info(idle));
157 octeon_processor_boot = cpu_logical_map(cpu);
158 mb();
159
160 count = 10000;
161 while (octeon_processor_sp && count) {
162
163 udelay(1);
164 count--;
165 }
166 if (count == 0)
167 pr_err("Secondary boot timeout\n");
168}
169
170
171
172
173
174static void octeon_init_secondary(void)
175{
176 const int coreid = cvmx_get_core_num();
177 union cvmx_ciu_intx_sum0 interrupt_enable;
178 unsigned int sr;
179
180#ifdef CONFIG_HOTPLUG_CPU
181 struct linux_app_boot_info *labi;
182
183 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
184
185 if (labi->labi_signature != LABI_SIGNATURE)
186 panic("The bootloader version on this board is incorrect.");
187#endif
188
189 sr = set_c0_status(ST0_BEV);
190 write_c0_ebase((u32)ebase);
191 write_c0_status(sr);
192
193 octeon_check_cpu_bist();
194 octeon_init_cvmcount();
195
196
197
198
199
200 cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), 0xffffffff);
201 interrupt_enable.u64 = 0;
202 interrupt_enable.s.mbox = 0x3;
203 cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), interrupt_enable.u64);
204 cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
205 cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
206 cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
207
208 set_c0_status(0x8c01);
209}
210
211
212
213
214
215void octeon_prepare_cpus(unsigned int max_cpus)
216{
217 cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
218 if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_DISABLED,
219 "mailbox0", mailbox_interrupt)) {
220 panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
221 }
222 if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_DISABLED,
223 "mailbox1", mailbox_interrupt)) {
224 panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
225 }
226}
227
228
229
230
231
232static void octeon_smp_finish(void)
233{
234#ifdef CONFIG_CAVIUM_GDB
235 unsigned long tmp;
236
237
238
239 asm volatile ("dmfc0 %0, $22\n"
240 "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
241#endif
242
243 octeon_user_io_init();
244
245
246 write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
247}
248
249
250
251
252static void octeon_cpus_done(void)
253{
254#ifdef CONFIG_CAVIUM_GDB
255 unsigned long tmp;
256
257
258
259 asm volatile ("dmfc0 %0, $22\n"
260 "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
261#endif
262}
263
264#ifdef CONFIG_HOTPLUG_CPU
265
266
267DEFINE_PER_CPU(int, cpu_state);
268
269extern void fixup_irqs(void);
270
271static DEFINE_SPINLOCK(smp_reserve_lock);
272
273static int octeon_cpu_disable(void)
274{
275 unsigned int cpu = smp_processor_id();
276
277 if (cpu == 0)
278 return -EBUSY;
279
280 spin_lock(&smp_reserve_lock);
281
282 cpu_clear(cpu, cpu_online_map);
283 cpu_clear(cpu, cpu_callin_map);
284 local_irq_disable();
285 fixup_irqs();
286 local_irq_enable();
287
288 flush_cache_all();
289 local_flush_tlb_all();
290
291 spin_unlock(&smp_reserve_lock);
292
293 return 0;
294}
295
296static void octeon_cpu_die(unsigned int cpu)
297{
298 int coreid = cpu_logical_map(cpu);
299 uint32_t mask, new_mask;
300 const struct cvmx_bootmem_named_block_desc *block_desc;
301
302 while (per_cpu(cpu_state, cpu) != CPU_DEAD)
303 cpu_relax();
304
305
306
307
308
309
310 mask = 1 << coreid;
311
312 block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
313
314 if (!block_desc) {
315 struct linux_app_boot_info *labi;
316
317 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
318
319 labi->avail_coremask |= mask;
320 new_mask = labi->avail_coremask;
321 } else {
322 uint32_t *p = (uint32_t *)PHYS_TO_XKSEG_CACHED(block_desc->base_addr +
323 AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
324 *p |= mask;
325 new_mask = *p;
326 }
327
328 pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask);
329 mb();
330 cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
331 cvmx_write_csr(CVMX_CIU_PP_RST, 0);
332}
333
334void play_dead(void)
335{
336 int cpu = cpu_number_map(cvmx_get_core_num());
337
338 idle_task_exit();
339 octeon_processor_boot = 0xff;
340 per_cpu(cpu_state, cpu) = CPU_DEAD;
341
342 mb();
343
344 while (1)
345 ;
346}
347
348extern void kernel_entry(unsigned long arg1, ...);
349
350static void start_after_reset(void)
351{
352 kernel_entry(0, 0, 0);
353}
354
355static int octeon_update_boot_vector(unsigned int cpu)
356{
357
358 int coreid = cpu_logical_map(cpu);
359 uint32_t avail_coremask;
360 const struct cvmx_bootmem_named_block_desc *block_desc;
361 struct boot_init_vector *boot_vect =
362 (struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR);
363
364 block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
365
366 if (!block_desc) {
367 struct linux_app_boot_info *labi;
368
369 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER);
370
371 avail_coremask = labi->avail_coremask;
372 labi->avail_coremask &= ~(1 << coreid);
373 } else {
374 avail_coremask = *(uint32_t *)PHYS_TO_XKSEG_CACHED(
375 block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK);
376 }
377
378 if (!(avail_coremask & (1 << coreid))) {
379
380 cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
381 cvmx_write_csr(CVMX_CIU_PP_RST, 0);
382 }
383
384 boot_vect[coreid].app_start_func_addr =
385 (uint32_t) (unsigned long) start_after_reset;
386 boot_vect[coreid].code_addr = octeon_bootloader_entry_addr;
387
388 mb();
389
390 cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);
391
392 return 0;
393}
394
395static int __cpuinit octeon_cpu_callback(struct notifier_block *nfb,
396 unsigned long action, void *hcpu)
397{
398 unsigned int cpu = (unsigned long)hcpu;
399
400 switch (action) {
401 case CPU_UP_PREPARE:
402 octeon_update_boot_vector(cpu);
403 break;
404 case CPU_ONLINE:
405 pr_info("Cpu %d online\n", cpu);
406 break;
407 case CPU_DEAD:
408 break;
409 }
410
411 return NOTIFY_OK;
412}
413
414static int __cpuinit register_cavium_notifier(void)
415{
416 hotcpu_notifier(octeon_cpu_callback, 0);
417 return 0;
418}
419late_initcall(register_cavium_notifier);
420
421#endif
422
423struct plat_smp_ops octeon_smp_ops = {
424 .send_ipi_single = octeon_send_ipi_single,
425 .send_ipi_mask = octeon_send_ipi_mask,
426 .init_secondary = octeon_init_secondary,
427 .smp_finish = octeon_smp_finish,
428 .cpus_done = octeon_cpus_done,
429 .boot_secondary = octeon_boot_secondary,
430 .smp_setup = octeon_smp_setup,
431 .prepare_cpus = octeon_prepare_cpus,
432#ifdef CONFIG_HOTPLUG_CPU
433 .cpu_disable = octeon_cpu_disable,
434 .cpu_die = octeon_cpu_die,
435#endif
436};
437