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5b3b1688 DD |
1 | /* |
2 | * This file is subject to the terms and conditions of the GNU General Public | |
3 | * License. See the file "COPYING" in the main directory of this archive | |
4 | * for more details. | |
5 | * | |
edfcbb8c | 6 | * Copyright (C) 2004-2008, 2009, 2010 Cavium Networks |
5b3b1688 | 7 | */ |
773cb77d | 8 | #include <linux/cpu.h> |
5b3b1688 DD |
9 | #include <linux/delay.h> |
10 | #include <linux/smp.h> | |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/kernel_stat.h> | |
13 | #include <linux/sched.h> | |
14 | #include <linux/module.h> | |
15 | ||
16 | #include <asm/mmu_context.h> | |
5b3b1688 | 17 | #include <asm/time.h> |
b81947c6 | 18 | #include <asm/setup.h> |
5b3b1688 DD |
19 | |
20 | #include <asm/octeon/octeon.h> | |
21 | ||
773cb77d RB |
22 | #include "octeon_boot.h" |
23 | ||
5b3b1688 DD |
24 | volatile unsigned long octeon_processor_boot = 0xff; |
25 | volatile unsigned long octeon_processor_sp; | |
26 | volatile unsigned long octeon_processor_gp; | |
27 | ||
773cb77d | 28 | #ifdef CONFIG_HOTPLUG_CPU |
babba4f1 DD |
29 | uint64_t octeon_bootloader_entry_addr; |
30 | EXPORT_SYMBOL(octeon_bootloader_entry_addr); | |
773cb77d RB |
31 | #endif |
32 | ||
5b3b1688 DD |
33 | static irqreturn_t mailbox_interrupt(int irq, void *dev_id) |
34 | { | |
35 | const int coreid = cvmx_get_core_num(); | |
36 | uint64_t action; | |
37 | ||
38 | /* Load the mailbox register to figure out what we're supposed to do */ | |
e650ce0f | 39 | action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid)) & 0xffff; |
5b3b1688 DD |
40 | |
41 | /* Clear the mailbox to clear the interrupt */ | |
42 | cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action); | |
43 | ||
44 | if (action & SMP_CALL_FUNCTION) | |
4ace6139 | 45 | generic_smp_call_function_interrupt(); |
184748cc PZ |
46 | if (action & SMP_RESCHEDULE_YOURSELF) |
47 | scheduler_ipi(); | |
5b3b1688 DD |
48 | |
49 | /* Check if we've been told to flush the icache */ | |
50 | if (action & SMP_ICACHE_FLUSH) | |
51 | asm volatile ("synci 0($0)\n"); | |
52 | return IRQ_HANDLED; | |
53 | } | |
54 | ||
55 | /** | |
56 | * Cause the function described by call_data to be executed on the passed | |
70342287 | 57 | * cpu. When the function has finished, increment the finished field of |
5b3b1688 DD |
58 | * call_data. |
59 | */ | |
60 | void octeon_send_ipi_single(int cpu, unsigned int action) | |
61 | { | |
62 | int coreid = cpu_logical_map(cpu); | |
63 | /* | |
64 | pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu, | |
65 | coreid, action); | |
66 | */ | |
67 | cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action); | |
68 | } | |
69 | ||
067f3290 DD |
70 | static inline void octeon_send_ipi_mask(const struct cpumask *mask, |
71 | unsigned int action) | |
5b3b1688 DD |
72 | { |
73 | unsigned int i; | |
74 | ||
8dd92891 | 75 | for_each_cpu(i, mask) |
5b3b1688 DD |
76 | octeon_send_ipi_single(i, action); |
77 | } | |
78 | ||
79 | /** | |
5f054e31 | 80 | * Detect available CPUs, populate cpu_possible_mask |
5b3b1688 | 81 | */ |
773cb77d RB |
82 | static void octeon_smp_hotplug_setup(void) |
83 | { | |
84 | #ifdef CONFIG_HOTPLUG_CPU | |
babba4f1 DD |
85 | struct linux_app_boot_info *labi; |
86 | ||
5ca0e377 AK |
87 | if (!setup_max_cpus) |
88 | return; | |
89 | ||
babba4f1 | 90 | labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); |
eac44d9c AK |
91 | if (labi->labi_signature != LABI_SIGNATURE) { |
92 | pr_info("The bootloader on this board does not support HOTPLUG_CPU."); | |
93 | return; | |
94 | } | |
babba4f1 DD |
95 | |
96 | octeon_bootloader_entry_addr = labi->InitTLBStart_addr; | |
773cb77d RB |
97 | #endif |
98 | } | |
99 | ||
5b3b1688 DD |
100 | static void octeon_smp_setup(void) |
101 | { | |
102 | const int coreid = cvmx_get_core_num(); | |
103 | int cpus; | |
104 | int id; | |
5b3b1688 | 105 | int core_mask = octeon_get_boot_coremask(); |
7d52ab16 DD |
106 | struct cvmx_sysinfo *sysinfo = cvmx_sysinfo_get(); |
107 | ||
edfcbb8c DD |
108 | #ifdef CONFIG_HOTPLUG_CPU |
109 | unsigned int num_cores = cvmx_octeon_num_cores(); | |
110 | #endif | |
111 | ||
112 | /* The present CPUs are initially just the boot cpu (CPU 0). */ | |
113 | for (id = 0; id < NR_CPUS; id++) { | |
114 | set_cpu_possible(id, id == 0); | |
115 | set_cpu_present(id, id == 0); | |
116 | } | |
5b3b1688 | 117 | |
5b3b1688 DD |
118 | __cpu_number_map[coreid] = 0; |
119 | __cpu_logical_map[0] = coreid; | |
5b3b1688 | 120 | |
edfcbb8c | 121 | /* The present CPUs get the lowest CPU numbers. */ |
5b3b1688 | 122 | cpus = 1; |
edfcbb8c | 123 | for (id = 0; id < NR_CPUS; id++) { |
7d52ab16 | 124 | if ((id != coreid) && cvmx_coremask_is_core_set(&sysinfo->core_mask, id)) { |
edfcbb8c DD |
125 | set_cpu_possible(cpus, true); |
126 | set_cpu_present(cpus, true); | |
127 | __cpu_number_map[id] = cpus; | |
128 | __cpu_logical_map[cpus] = id; | |
129 | cpus++; | |
130 | } | |
131 | } | |
132 | ||
133 | #ifdef CONFIG_HOTPLUG_CPU | |
134 | /* | |
70342287 RB |
135 | * The possible CPUs are all those present on the chip. We |
136 | * will assign CPU numbers for possible cores as well. Cores | |
edfcbb8c DD |
137 | * are always consecutively numberd from 0. |
138 | */ | |
eac44d9c AK |
139 | for (id = 0; setup_max_cpus && octeon_bootloader_entry_addr && |
140 | id < num_cores && id < NR_CPUS; id++) { | |
edfcbb8c DD |
141 | if (!(core_mask & (1 << id))) { |
142 | set_cpu_possible(cpus, true); | |
5b3b1688 DD |
143 | __cpu_number_map[id] = cpus; |
144 | __cpu_logical_map[cpus] = id; | |
145 | cpus++; | |
146 | } | |
147 | } | |
edfcbb8c | 148 | #endif |
773cb77d RB |
149 | |
150 | octeon_smp_hotplug_setup(); | |
5b3b1688 DD |
151 | } |
152 | ||
153 | /** | |
154 | * Firmware CPU startup hook | |
155 | * | |
156 | */ | |
157 | static void octeon_boot_secondary(int cpu, struct task_struct *idle) | |
158 | { | |
159 | int count; | |
160 | ||
161 | pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu, | |
162 | cpu_logical_map(cpu)); | |
163 | ||
164 | octeon_processor_sp = __KSTK_TOS(idle); | |
165 | octeon_processor_gp = (unsigned long)(task_thread_info(idle)); | |
166 | octeon_processor_boot = cpu_logical_map(cpu); | |
167 | mb(); | |
168 | ||
169 | count = 10000; | |
170 | while (octeon_processor_sp && count) { | |
171 | /* Waiting for processor to get the SP and GP */ | |
172 | udelay(1); | |
173 | count--; | |
174 | } | |
175 | if (count == 0) | |
176 | pr_err("Secondary boot timeout\n"); | |
177 | } | |
178 | ||
179 | /** | |
180 | * After we've done initial boot, this function is called to allow the | |
181 | * board code to clean up state, if needed | |
182 | */ | |
078a55fc | 183 | static void octeon_init_secondary(void) |
5b3b1688 | 184 | { |
babba4f1 | 185 | unsigned int sr; |
5b3b1688 | 186 | |
babba4f1 DD |
187 | sr = set_c0_status(ST0_BEV); |
188 | write_c0_ebase((u32)ebase); | |
189 | write_c0_status(sr); | |
190 | ||
5b3b1688 DD |
191 | octeon_check_cpu_bist(); |
192 | octeon_init_cvmcount(); | |
0c326387 DD |
193 | |
194 | octeon_irq_setup_secondary(); | |
5b3b1688 DD |
195 | } |
196 | ||
197 | /** | |
198 | * Callout to firmware before smp_init | |
199 | * | |
200 | */ | |
201 | void octeon_prepare_cpus(unsigned int max_cpus) | |
202 | { | |
e650ce0f DD |
203 | /* |
204 | * Only the low order mailbox bits are used for IPIs, leave | |
205 | * the other bits alone. | |
206 | */ | |
207 | cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff); | |
e63fb7a9 VS |
208 | if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, |
209 | IRQF_PERCPU | IRQF_NO_THREAD, "SMP-IPI", | |
210 | mailbox_interrupt)) { | |
ab75dc02 | 211 | panic("Cannot request_irq(OCTEON_IRQ_MBOX0)"); |
5b3b1688 | 212 | } |
5b3b1688 DD |
213 | } |
214 | ||
215 | /** | |
216 | * Last chance for the board code to finish SMP initialization before | |
217 | * the CPU is "online". | |
218 | */ | |
219 | static void octeon_smp_finish(void) | |
220 | { | |
5b3b1688 DD |
221 | octeon_user_io_init(); |
222 | ||
223 | /* to generate the first CPU timer interrupt */ | |
224 | write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ); | |
1bcfecc0 | 225 | local_irq_enable(); |
5b3b1688 DD |
226 | } |
227 | ||
773cb77d RB |
228 | #ifdef CONFIG_HOTPLUG_CPU |
229 | ||
230 | /* State of each CPU. */ | |
231 | DEFINE_PER_CPU(int, cpu_state); | |
232 | ||
773cb77d RB |
233 | static int octeon_cpu_disable(void) |
234 | { | |
235 | unsigned int cpu = smp_processor_id(); | |
236 | ||
237 | if (cpu == 0) | |
238 | return -EBUSY; | |
239 | ||
eac44d9c AK |
240 | if (!octeon_bootloader_entry_addr) |
241 | return -ENOTSUPP; | |
242 | ||
0b5f9c00 | 243 | set_cpu_online(cpu, false); |
8dd92891 | 244 | cpumask_clear_cpu(cpu, &cpu_callin_map); |
17efb59a | 245 | octeon_fixup_irqs(); |
773cb77d | 246 | |
9329c154 | 247 | __flush_cache_all(); |
773cb77d RB |
248 | local_flush_tlb_all(); |
249 | ||
773cb77d RB |
250 | return 0; |
251 | } | |
252 | ||
253 | static void octeon_cpu_die(unsigned int cpu) | |
254 | { | |
255 | int coreid = cpu_logical_map(cpu); | |
babba4f1 DD |
256 | uint32_t mask, new_mask; |
257 | const struct cvmx_bootmem_named_block_desc *block_desc; | |
773cb77d | 258 | |
773cb77d RB |
259 | while (per_cpu(cpu_state, cpu) != CPU_DEAD) |
260 | cpu_relax(); | |
261 | ||
262 | /* | |
263 | * This is a bit complicated strategics of getting/settig available | |
264 | * cores mask, copied from bootloader | |
265 | */ | |
babba4f1 DD |
266 | |
267 | mask = 1 << coreid; | |
773cb77d RB |
268 | /* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */ |
269 | block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME); | |
270 | ||
271 | if (!block_desc) { | |
babba4f1 | 272 | struct linux_app_boot_info *labi; |
773cb77d | 273 | |
babba4f1 | 274 | labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); |
773cb77d | 275 | |
babba4f1 DD |
276 | labi->avail_coremask |= mask; |
277 | new_mask = labi->avail_coremask; | |
278 | } else { /* alternative, already initialized */ | |
279 | uint32_t *p = (uint32_t *)PHYS_TO_XKSEG_CACHED(block_desc->base_addr + | |
280 | AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK); | |
281 | *p |= mask; | |
282 | new_mask = *p; | |
773cb77d RB |
283 | } |
284 | ||
babba4f1 DD |
285 | pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask); |
286 | mb(); | |
773cb77d RB |
287 | cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid); |
288 | cvmx_write_csr(CVMX_CIU_PP_RST, 0); | |
289 | } | |
290 | ||
291 | void play_dead(void) | |
292 | { | |
babba4f1 | 293 | int cpu = cpu_number_map(cvmx_get_core_num()); |
773cb77d RB |
294 | |
295 | idle_task_exit(); | |
296 | octeon_processor_boot = 0xff; | |
babba4f1 DD |
297 | per_cpu(cpu_state, cpu) = CPU_DEAD; |
298 | ||
299 | mb(); | |
773cb77d RB |
300 | |
301 | while (1) /* core will be reset here */ | |
302 | ; | |
303 | } | |
304 | ||
305 | extern void kernel_entry(unsigned long arg1, ...); | |
306 | ||
307 | static void start_after_reset(void) | |
308 | { | |
70342287 | 309 | kernel_entry(0, 0, 0); /* set a2 = 0 for secondary core */ |
773cb77d RB |
310 | } |
311 | ||
babba4f1 | 312 | static int octeon_update_boot_vector(unsigned int cpu) |
773cb77d RB |
313 | { |
314 | ||
315 | int coreid = cpu_logical_map(cpu); | |
babba4f1 DD |
316 | uint32_t avail_coremask; |
317 | const struct cvmx_bootmem_named_block_desc *block_desc; | |
773cb77d | 318 | struct boot_init_vector *boot_vect = |
babba4f1 | 319 | (struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR); |
773cb77d RB |
320 | |
321 | block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME); | |
322 | ||
323 | if (!block_desc) { | |
babba4f1 DD |
324 | struct linux_app_boot_info *labi; |
325 | ||
326 | labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); | |
327 | ||
328 | avail_coremask = labi->avail_coremask; | |
329 | labi->avail_coremask &= ~(1 << coreid); | |
773cb77d | 330 | } else { /* alternative, already initialized */ |
babba4f1 DD |
331 | avail_coremask = *(uint32_t *)PHYS_TO_XKSEG_CACHED( |
332 | block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK); | |
773cb77d RB |
333 | } |
334 | ||
335 | if (!(avail_coremask & (1 << coreid))) { | |
92a76f6d | 336 | /* core not available, assume, that caught by simple-executive */ |
773cb77d RB |
337 | cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid); |
338 | cvmx_write_csr(CVMX_CIU_PP_RST, 0); | |
339 | } | |
340 | ||
341 | boot_vect[coreid].app_start_func_addr = | |
342 | (uint32_t) (unsigned long) start_after_reset; | |
babba4f1 | 343 | boot_vect[coreid].code_addr = octeon_bootloader_entry_addr; |
773cb77d | 344 | |
babba4f1 | 345 | mb(); |
773cb77d RB |
346 | |
347 | cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask); | |
348 | ||
349 | return 0; | |
350 | } | |
351 | ||
078a55fc | 352 | static int octeon_cpu_callback(struct notifier_block *nfb, |
773cb77d RB |
353 | unsigned long action, void *hcpu) |
354 | { | |
355 | unsigned int cpu = (unsigned long)hcpu; | |
356 | ||
357 | switch (action) { | |
358 | case CPU_UP_PREPARE: | |
359 | octeon_update_boot_vector(cpu); | |
360 | break; | |
361 | case CPU_ONLINE: | |
362 | pr_info("Cpu %d online\n", cpu); | |
363 | break; | |
364 | case CPU_DEAD: | |
365 | break; | |
366 | } | |
367 | ||
368 | return NOTIFY_OK; | |
369 | } | |
370 | ||
078a55fc | 371 | static int register_cavium_notifier(void) |
773cb77d | 372 | { |
442f2012 | 373 | hotcpu_notifier(octeon_cpu_callback, 0); |
773cb77d RB |
374 | return 0; |
375 | } | |
773cb77d RB |
376 | late_initcall(register_cavium_notifier); |
377 | ||
70342287 | 378 | #endif /* CONFIG_HOTPLUG_CPU */ |
773cb77d | 379 | |
5b3b1688 DD |
380 | struct plat_smp_ops octeon_smp_ops = { |
381 | .send_ipi_single = octeon_send_ipi_single, | |
382 | .send_ipi_mask = octeon_send_ipi_mask, | |
383 | .init_secondary = octeon_init_secondary, | |
384 | .smp_finish = octeon_smp_finish, | |
5b3b1688 DD |
385 | .boot_secondary = octeon_boot_secondary, |
386 | .smp_setup = octeon_smp_setup, | |
387 | .prepare_cpus = octeon_prepare_cpus, | |
773cb77d RB |
388 | #ifdef CONFIG_HOTPLUG_CPU |
389 | .cpu_disable = octeon_cpu_disable, | |
390 | .cpu_die = octeon_cpu_die, | |
391 | #endif | |
5b3b1688 | 392 | }; |