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 * 6 * Copyright (C) 2004-2008, 2009, 2010 Cavium Networks 7 */ 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/time.h> 19 #include <asm/setup.h> 20 21 #include <asm/octeon/octeon.h> 22 23 #include "octeon_boot.h" 24 25 volatile unsigned long octeon_processor_boot = 0xff; 26 volatile unsigned long octeon_processor_sp; 27 volatile unsigned long octeon_processor_gp; 28 29 #ifdef CONFIG_HOTPLUG_CPU 30 uint64_t octeon_bootloader_entry_addr; 31 EXPORT_SYMBOL(octeon_bootloader_entry_addr); 32 #endif 33 34 static irqreturn_t mailbox_interrupt(int irq, void *dev_id) 35 { 36 const int coreid = cvmx_get_core_num(); 37 uint64_t action; 38 39 /* Load the mailbox register to figure out what we're supposed to do */ 40 action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid)) & 0xffff; 41 42 /* Clear the mailbox to clear the interrupt */ 43 cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), action); 44 45 if (action & SMP_CALL_FUNCTION) 46 smp_call_function_interrupt(); 47 if (action & SMP_RESCHEDULE_YOURSELF) 48 scheduler_ipi(); 49 50 /* Check if we've been told to flush the icache */ 51 if (action & SMP_ICACHE_FLUSH) 52 asm volatile ("synci 0($0)\n"); 53 return IRQ_HANDLED; 54 } 55 56 /** 57 * Cause the function described by call_data to be executed on the passed 58 * cpu. When the function has finished, increment the finished field of 59 * call_data. 60 */ 61 void octeon_send_ipi_single(int cpu, unsigned int action) 62 { 63 int coreid = cpu_logical_map(cpu); 64 /* 65 pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu, 66 coreid, action); 67 */ 68 cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action); 69 } 70 71 static inline void octeon_send_ipi_mask(const struct cpumask *mask, 72 unsigned int action) 73 { 74 unsigned int i; 75 76 for_each_cpu_mask(i, *mask) 77 octeon_send_ipi_single(i, action); 78 } 79 80 /** 81 * Detect available CPUs, populate cpu_possible_mask 82 */ 83 static void octeon_smp_hotplug_setup(void) 84 { 85 #ifdef CONFIG_HOTPLUG_CPU 86 struct linux_app_boot_info *labi; 87 88 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); 89 if (labi->labi_signature != LABI_SIGNATURE) 90 panic("The bootloader version on this board is incorrect."); 91 92 octeon_bootloader_entry_addr = labi->InitTLBStart_addr; 93 #endif 94 } 95 96 static void octeon_smp_setup(void) 97 { 98 const int coreid = cvmx_get_core_num(); 99 int cpus; 100 int id; 101 int core_mask = octeon_get_boot_coremask(); 102 #ifdef CONFIG_HOTPLUG_CPU 103 unsigned int num_cores = cvmx_octeon_num_cores(); 104 #endif 105 106 /* The present CPUs are initially just the boot cpu (CPU 0). */ 107 for (id = 0; id < NR_CPUS; id++) { 108 set_cpu_possible(id, id == 0); 109 set_cpu_present(id, id == 0); 110 } 111 112 __cpu_number_map[coreid] = 0; 113 __cpu_logical_map[0] = coreid; 114 115 /* The present CPUs get the lowest CPU numbers. */ 116 cpus = 1; 117 for (id = 0; id < NR_CPUS; id++) { 118 if ((id != coreid) && (core_mask & (1 << id))) { 119 set_cpu_possible(cpus, true); 120 set_cpu_present(cpus, true); 121 __cpu_number_map[id] = cpus; 122 __cpu_logical_map[cpus] = id; 123 cpus++; 124 } 125 } 126 127 #ifdef CONFIG_HOTPLUG_CPU 128 /* 129 * The possible CPUs are all those present on the chip. We 130 * will assign CPU numbers for possible cores as well. Cores 131 * are always consecutively numberd from 0. 132 */ 133 for (id = 0; id < num_cores && id < NR_CPUS; id++) { 134 if (!(core_mask & (1 << id))) { 135 set_cpu_possible(cpus, true); 136 __cpu_number_map[id] = cpus; 137 __cpu_logical_map[cpus] = id; 138 cpus++; 139 } 140 } 141 #endif 142 143 octeon_smp_hotplug_setup(); 144 } 145 146 /** 147 * Firmware CPU startup hook 148 * 149 */ 150 static void octeon_boot_secondary(int cpu, struct task_struct *idle) 151 { 152 int count; 153 154 pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu, 155 cpu_logical_map(cpu)); 156 157 octeon_processor_sp = __KSTK_TOS(idle); 158 octeon_processor_gp = (unsigned long)(task_thread_info(idle)); 159 octeon_processor_boot = cpu_logical_map(cpu); 160 mb(); 161 162 count = 10000; 163 while (octeon_processor_sp && count) { 164 /* Waiting for processor to get the SP and GP */ 165 udelay(1); 166 count--; 167 } 168 if (count == 0) 169 pr_err("Secondary boot timeout\n"); 170 } 171 172 /** 173 * After we've done initial boot, this function is called to allow the 174 * board code to clean up state, if needed 175 */ 176 static void octeon_init_secondary(void) 177 { 178 unsigned int sr; 179 180 sr = set_c0_status(ST0_BEV); 181 write_c0_ebase((u32)ebase); 182 write_c0_status(sr); 183 184 octeon_check_cpu_bist(); 185 octeon_init_cvmcount(); 186 187 octeon_irq_setup_secondary(); 188 } 189 190 /** 191 * Callout to firmware before smp_init 192 * 193 */ 194 void octeon_prepare_cpus(unsigned int max_cpus) 195 { 196 #ifdef CONFIG_HOTPLUG_CPU 197 struct linux_app_boot_info *labi; 198 199 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); 200 201 if (labi->labi_signature != LABI_SIGNATURE) 202 panic("The bootloader version on this board is incorrect."); 203 #endif 204 /* 205 * Only the low order mailbox bits are used for IPIs, leave 206 * the other bits alone. 207 */ 208 cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffff); 209 if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, 210 IRQF_PERCPU | IRQF_NO_THREAD, "SMP-IPI", 211 mailbox_interrupt)) { 212 panic("Cannot request_irq(OCTEON_IRQ_MBOX0)"); 213 } 214 } 215 216 /** 217 * Last chance for the board code to finish SMP initialization before 218 * the CPU is "online". 219 */ 220 static void octeon_smp_finish(void) 221 { 222 #ifdef CONFIG_CAVIUM_GDB 223 unsigned long tmp; 224 /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0 225 to be not masked by this core so we know the signal is received by 226 someone */ 227 asm volatile ("dmfc0 %0, $22\n" 228 "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp)); 229 #endif 230 231 octeon_user_io_init(); 232 233 /* to generate the first CPU timer interrupt */ 234 write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ); 235 local_irq_enable(); 236 } 237 238 /** 239 * Hook for after all CPUs are online 240 */ 241 static void octeon_cpus_done(void) 242 { 243 #ifdef CONFIG_CAVIUM_GDB 244 unsigned long tmp; 245 /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0 246 to be not masked by this core so we know the signal is received by 247 someone */ 248 asm volatile ("dmfc0 %0, $22\n" 249 "ori %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp)); 250 #endif 251 } 252 253 #ifdef CONFIG_HOTPLUG_CPU 254 255 /* State of each CPU. */ 256 DEFINE_PER_CPU(int, cpu_state); 257 258 static int octeon_cpu_disable(void) 259 { 260 unsigned int cpu = smp_processor_id(); 261 262 if (cpu == 0) 263 return -EBUSY; 264 265 set_cpu_online(cpu, false); 266 cpu_clear(cpu, cpu_callin_map); 267 local_irq_disable(); 268 octeon_fixup_irqs(); 269 local_irq_enable(); 270 271 flush_cache_all(); 272 local_flush_tlb_all(); 273 274 return 0; 275 } 276 277 static void octeon_cpu_die(unsigned int cpu) 278 { 279 int coreid = cpu_logical_map(cpu); 280 uint32_t mask, new_mask; 281 const struct cvmx_bootmem_named_block_desc *block_desc; 282 283 while (per_cpu(cpu_state, cpu) != CPU_DEAD) 284 cpu_relax(); 285 286 /* 287 * This is a bit complicated strategics of getting/settig available 288 * cores mask, copied from bootloader 289 */ 290 291 mask = 1 << coreid; 292 /* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */ 293 block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME); 294 295 if (!block_desc) { 296 struct linux_app_boot_info *labi; 297 298 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); 299 300 labi->avail_coremask |= mask; 301 new_mask = labi->avail_coremask; 302 } else { /* alternative, already initialized */ 303 uint32_t *p = (uint32_t *)PHYS_TO_XKSEG_CACHED(block_desc->base_addr + 304 AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK); 305 *p |= mask; 306 new_mask = *p; 307 } 308 309 pr_info("Reset core %d. Available Coremask = 0x%x \n", coreid, new_mask); 310 mb(); 311 cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid); 312 cvmx_write_csr(CVMX_CIU_PP_RST, 0); 313 } 314 315 void play_dead(void) 316 { 317 int cpu = cpu_number_map(cvmx_get_core_num()); 318 319 idle_task_exit(); 320 octeon_processor_boot = 0xff; 321 per_cpu(cpu_state, cpu) = CPU_DEAD; 322 323 mb(); 324 325 while (1) /* core will be reset here */ 326 ; 327 } 328 329 extern void kernel_entry(unsigned long arg1, ...); 330 331 static void start_after_reset(void) 332 { 333 kernel_entry(0, 0, 0); /* set a2 = 0 for secondary core */ 334 } 335 336 static int octeon_update_boot_vector(unsigned int cpu) 337 { 338 339 int coreid = cpu_logical_map(cpu); 340 uint32_t avail_coremask; 341 const struct cvmx_bootmem_named_block_desc *block_desc; 342 struct boot_init_vector *boot_vect = 343 (struct boot_init_vector *)PHYS_TO_XKSEG_CACHED(BOOTLOADER_BOOT_VECTOR); 344 345 block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME); 346 347 if (!block_desc) { 348 struct linux_app_boot_info *labi; 349 350 labi = (struct linux_app_boot_info *)PHYS_TO_XKSEG_CACHED(LABI_ADDR_IN_BOOTLOADER); 351 352 avail_coremask = labi->avail_coremask; 353 labi->avail_coremask &= ~(1 << coreid); 354 } else { /* alternative, already initialized */ 355 avail_coremask = *(uint32_t *)PHYS_TO_XKSEG_CACHED( 356 block_desc->base_addr + AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK); 357 } 358 359 if (!(avail_coremask & (1 << coreid))) { 360 /* core not available, assume, that catched by simple-executive */ 361 cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid); 362 cvmx_write_csr(CVMX_CIU_PP_RST, 0); 363 } 364 365 boot_vect[coreid].app_start_func_addr = 366 (uint32_t) (unsigned long) start_after_reset; 367 boot_vect[coreid].code_addr = octeon_bootloader_entry_addr; 368 369 mb(); 370 371 cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask); 372 373 return 0; 374 } 375 376 static int octeon_cpu_callback(struct notifier_block *nfb, 377 unsigned long action, void *hcpu) 378 { 379 unsigned int cpu = (unsigned long)hcpu; 380 381 switch (action) { 382 case CPU_UP_PREPARE: 383 octeon_update_boot_vector(cpu); 384 break; 385 case CPU_ONLINE: 386 pr_info("Cpu %d online\n", cpu); 387 break; 388 case CPU_DEAD: 389 break; 390 } 391 392 return NOTIFY_OK; 393 } 394 395 static int register_cavium_notifier(void) 396 { 397 hotcpu_notifier(octeon_cpu_callback, 0); 398 return 0; 399 } 400 late_initcall(register_cavium_notifier); 401 402 #endif /* CONFIG_HOTPLUG_CPU */ 403 404 struct plat_smp_ops octeon_smp_ops = { 405 .send_ipi_single = octeon_send_ipi_single, 406 .send_ipi_mask = octeon_send_ipi_mask, 407 .init_secondary = octeon_init_secondary, 408 .smp_finish = octeon_smp_finish, 409 .cpus_done = octeon_cpus_done, 410 .boot_secondary = octeon_boot_secondary, 411 .smp_setup = octeon_smp_setup, 412 .prepare_cpus = octeon_prepare_cpus, 413 #ifdef CONFIG_HOTPLUG_CPU 414 .cpu_disable = octeon_cpu_disable, 415 .cpu_die = octeon_cpu_die, 416 #endif 417 }; 418