arch/mips/cavium-octeon/smp.c

   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 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/system.h>
  19 #include <asm/time.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 static unsigned int InitTLBStart_addr;
  31 #endif
  32
  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 */
  39         action = cvmx_read_csr(CVMX_CIU_MBOX_CLRX(coreid));
  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)
  45                 smp_call_function_interrupt();
  46
  47         /* Check if we've been told to flush the icache */
  48         if (action & SMP_ICACHE_FLUSH)
  49                 asm volatile ("synci 0($0)\n");
  50         return IRQ_HANDLED;
  51 }
  52
  53 /**
  54  * Cause the function described by call_data to be executed on the passed
  55  * cpu.  When the function has finished, increment the finished field of
  56  * call_data.
  57  */
  58 void octeon_send_ipi_single(int cpu, unsigned int action)
  59 {
  60         int coreid = cpu_logical_map(cpu);
  61         /*
  62         pr_info("SMP: Mailbox send cpu=%d, coreid=%d, action=%u\n", cpu,
  63                coreid, action);
  64         */
  65         cvmx_write_csr(CVMX_CIU_MBOX_SETX(coreid), action);
  66 }
  67
  68 static inline void octeon_send_ipi_mask(cpumask_t mask, unsigned int action)
  69 {
  70         unsigned int i;
  71
  72         for_each_cpu_mask(i, mask)
  73                 octeon_send_ipi_single(i, action);
  74 }
  75
  76 /**
  77  * Detect available CPUs, populate cpu_possible_map
  78  */
  79 static void octeon_smp_hotplug_setup(void)
  80 {
  81 #ifdef CONFIG_HOTPLUG_CPU
  82         uint32_t labi_signature;
  83
  84         labi_signature =
  85                 cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
  86                                         LABI_ADDR_IN_BOOTLOADER +
  87                                         offsetof(struct linux_app_boot_info,
  88                                                     labi_signature)));
  89         if (labi_signature != LABI_SIGNATURE)
  90                 pr_err("The bootloader version on this board is incorrect\n");
  91         InitTLBStart_addr =
  92                 cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
  93                                    LABI_ADDR_IN_BOOTLOADER +
  94                                            offsetof(struct linux_app_boot_info,
  95                                                     InitTLBStart_addr)));
  96 #endif
  97 }
  98
  99 static void octeon_smp_setup(void)
 100 {
 101         const int coreid = cvmx_get_core_num();
 102         int cpus;
 103         int id;
 104
 105         int core_mask = octeon_get_boot_coremask();
 106
 107         cpus_clear(cpu_possible_map);
 108         __cpu_number_map[coreid] = 0;
 109         __cpu_logical_map[0] = coreid;
 110         cpu_set(0, cpu_possible_map);
 111
 112         cpus = 1;
 113         for (id = 0; id < 16; id++) {
 114                 if ((id != coreid) && (core_mask & (1 << id))) {
 115                         cpu_set(cpus, cpu_possible_map);
 116                         __cpu_number_map[id] = cpus;
 117                         __cpu_logical_map[cpus] = id;
 118                         cpus++;
 119                 }
 120         }
 121         cpu_present_map = cpu_possible_map;
 122
 123         octeon_smp_hotplug_setup();
 124 }
 125
 126 /**
 127  * Firmware CPU startup hook
 128  *
 129  */
 130 static void octeon_boot_secondary(int cpu, struct task_struct *idle)
 131 {
 132         int count;
 133
 134         pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
 135                 cpu_logical_map(cpu));
 136
 137         octeon_processor_sp = __KSTK_TOS(idle);
 138         octeon_processor_gp = (unsigned long)(task_thread_info(idle));
 139         octeon_processor_boot = cpu_logical_map(cpu);
 140         mb();
 141
 142         count = 10000;
 143         while (octeon_processor_sp && count) {
 144                 /* Waiting for processor to get the SP and GP */
 145                 udelay(1);
 146                 count--;
 147         }
 148         if (count == 0)
 149                 pr_err("Secondary boot timeout\n");
 150 }
 151
 152 /**
 153  * After we've done initial boot, this function is called to allow the
 154  * board code to clean up state, if needed
 155  */
 156 static void octeon_init_secondary(void)
 157 {
 158         const int coreid = cvmx_get_core_num();
 159         union cvmx_ciu_intx_sum0 interrupt_enable;
 160
 161 #ifdef CONFIG_HOTPLUG_CPU
 162         unsigned int cur_exception_base;
 163
 164         cur_exception_base = cvmx_read64_uint32(
 165                 CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 166                              LABI_ADDR_IN_BOOTLOADER +
 167                              offsetof(struct linux_app_boot_info,
 168                                       cur_exception_base)));
 169         /* cur_exception_base is incremented in bootloader after setting */
 170         write_c0_ebase((unsigned int)(cur_exception_base - EXCEPTION_BASE_INCR));
 171 #endif
 172         octeon_check_cpu_bist();
 173         octeon_init_cvmcount();
 174         /*
 175         pr_info("SMP: CPU%d (CoreId %lu) started\n", cpu, coreid);
 176         */
 177         /* Enable Mailbox interrupts to this core. These are the only
 178            interrupts allowed on line 3 */
 179         cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), 0xffffffff);
 180         interrupt_enable.u64 = 0;
 181         interrupt_enable.s.mbox = 0x3;
 182         cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), interrupt_enable.u64);
 183         cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
 184         cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
 185         cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
 186         /* Enable core interrupt processing for 2,3 and 7 */
 187         set_c0_status(0x8c01);
 188 }
 189
 190 /**
 191  * Callout to firmware before smp_init
 192  *
 193  */
 194 void octeon_prepare_cpus(unsigned int max_cpus)
 195 {
 196         cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
 197         if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_DISABLED,
 198                         "mailbox0", mailbox_interrupt)) {
 199                 panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
 200         }
 201         if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_DISABLED,
 202                         "mailbox1", mailbox_interrupt)) {
 203                 panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
 204         }
 205 }
 206
 207 /**
 208  * Last chance for the board code to finish SMP initialization before
 209  * the CPU is "online".
 210  */
 211 static void octeon_smp_finish(void)
 212 {
 213 #ifdef CONFIG_CAVIUM_GDB
 214         unsigned long tmp;
 215         /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
 216            to be not masked by this core so we know the signal is received by
 217            someone */
 218         asm volatile ("dmfc0 %0, $22\n"
 219                       "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
 220 #endif
 221
 222         octeon_user_io_init();
 223
 224         /* to generate the first CPU timer interrupt */
 225         write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
 226 }
 227
 228 /**
 229  * Hook for after all CPUs are online
 230  */
 231 static void octeon_cpus_done(void)
 232 {
 233 #ifdef CONFIG_CAVIUM_GDB
 234         unsigned long tmp;
 235         /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
 236            to be not masked by this core so we know the signal is received by
 237            someone */
 238         asm volatile ("dmfc0 %0, $22\n"
 239                       "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
 240 #endif
 241 }
 242
 243 #ifdef CONFIG_HOTPLUG_CPU
 244
 245 /* State of each CPU. */
 246 DEFINE_PER_CPU(int, cpu_state);
 247
 248 extern void fixup_irqs(void);
 249
 250 static DEFINE_SPINLOCK(smp_reserve_lock);
 251
 252 static int octeon_cpu_disable(void)
 253 {
 254         unsigned int cpu = smp_processor_id();
 255
 256         if (cpu == 0)
 257                 return -EBUSY;
 258
 259         spin_lock(&smp_reserve_lock);
 260
 261         cpu_clear(cpu, cpu_online_map);
 262         cpu_clear(cpu, cpu_callin_map);
 263         local_irq_disable();
 264         fixup_irqs();
 265         local_irq_enable();
 266
 267         flush_cache_all();
 268         local_flush_tlb_all();
 269
 270         spin_unlock(&smp_reserve_lock);
 271
 272         return 0;
 273 }
 274
 275 static void octeon_cpu_die(unsigned int cpu)
 276 {
 277         int coreid = cpu_logical_map(cpu);
 278         uint32_t avail_coremask;
 279         struct cvmx_bootmem_named_block_desc *block_desc;
 280
 281 #ifdef CONFIG_CAVIUM_OCTEON_WATCHDOG
 282         /* Disable the watchdog */
 283         cvmx_ciu_wdogx_t ciu_wdog;
 284         ciu_wdog.u64 = cvmx_read_csr(CVMX_CIU_WDOGX(cpu));
 285         ciu_wdog.s.mode = 0;
 286         cvmx_write_csr(CVMX_CIU_WDOGX(cpu), ciu_wdog.u64);
 287 #endif
 288
 289         while (per_cpu(cpu_state, cpu) != CPU_DEAD)
 290                 cpu_relax();
 291
 292         /*
 293          * This is a bit complicated strategics of getting/settig available
 294          * cores mask, copied from bootloader
 295          */
 296         /* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
 297         block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
 298
 299         if (!block_desc) {
 300                 avail_coremask =
 301                         cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 302                                                    LABI_ADDR_IN_BOOTLOADER +
 303                                                    offsetof
 304                                                    (struct linux_app_boot_info,
 305                                                     avail_coremask)));
 306         } else {                       /* alternative, already initialized */
 307                avail_coremask =
 308                    cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 309                                                    block_desc->base_addr +
 310                                                   AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
 311         }
 312
 313         avail_coremask |= 1 << coreid;
 314
 315         /* Setting avail_coremask for bootoct binary */
 316         if (!block_desc) {
 317                 cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 318                                                 LABI_ADDR_IN_BOOTLOADER +
 319                                                 offsetof(struct linux_app_boot_info,
 320                                                          avail_coremask)),
 321                                    avail_coremask);
 322         } else {
 323                 cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 324                                                 block_desc->base_addr +
 325                                                 AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK),
 326                                    avail_coremask);
 327         }
 328
 329         pr_info("Reset core %d. Available Coremask = %x \n", coreid,
 330                 avail_coremask);
 331         cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 332         cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 333 }
 334
 335 void play_dead(void)
 336 {
 337         int coreid = cvmx_get_core_num();
 338
 339         idle_task_exit();
 340         octeon_processor_boot = 0xff;
 341         per_cpu(cpu_state, coreid) = CPU_DEAD;
 342
 343         while (1)       /* core will be reset here */
 344                 ;
 345 }
 346
 347 extern void kernel_entry(unsigned long arg1, ...);
 348
 349 static void start_after_reset(void)
 350 {
 351         kernel_entry(0, 0, 0);  /* set a2 = 0 for secondary core */
 352 }
 353
 354 int octeon_update_boot_vector(unsigned int cpu)
 355 {
 356
 357         int coreid = cpu_logical_map(cpu);
 358         unsigned int avail_coremask;
 359         struct cvmx_bootmem_named_block_desc *block_desc;
 360         struct boot_init_vector *boot_vect =
 361                 (struct boot_init_vector *) cvmx_phys_to_ptr(0x0 +
 362                                                   BOOTLOADER_BOOT_VECTOR);
 363
 364         block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
 365
 366         if (!block_desc) {
 367                 avail_coremask =
 368                         cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 369                                            LABI_ADDR_IN_BOOTLOADER +
 370                                                 offsetof(struct linux_app_boot_info,
 371                                                 avail_coremask)));
 372         } else {                       /* alternative, already initialized */
 373                avail_coremask =
 374                    cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 375                                                    block_desc->base_addr +
 376                                                    AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
 377         }
 378
 379         if (!(avail_coremask & (1 << coreid))) {
 380                 /* core not available, assume, that catched by simple-executive */
 381                 cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 382                 cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 383         }
 384
 385         boot_vect[coreid].app_start_func_addr =
 386                 (uint32_t) (unsigned long) start_after_reset;
 387         boot_vect[coreid].code_addr = InitTLBStart_addr;
 388
 389         CVMX_SYNC;
 390
 391         cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);
 392
 393         return 0;
 394 }
 395
 396 static int __cpuinit octeon_cpu_callback(struct notifier_block *nfb,
 397         unsigned long action, void *hcpu)
 398 {
 399         unsigned int cpu = (unsigned long)hcpu;
 400
 401         switch (action) {
 402         case CPU_UP_PREPARE:
 403                 octeon_update_boot_vector(cpu);
 404                 break;
 405         case CPU_ONLINE:
 406                 pr_info("Cpu %d online\n", cpu);
 407                 break;
 408         case CPU_DEAD:
 409                 break;
 410         }
 411
 412         return NOTIFY_OK;
 413 }
 414
 415 static struct notifier_block __cpuinitdata octeon_cpu_notifier = {
 416         .notifier_call = octeon_cpu_callback,
 417 };
 418
 419 static int __cpuinit register_cavium_notifier(void)
 420 {
 421         register_hotcpu_notifier(&octeon_cpu_notifier);
 422
 423         return 0;
 424 }
 425
 426 late_initcall(register_cavium_notifier);
 427
 428 #endif  /* CONFIG_HOTPLUG_CPU */
 429
 430 struct plat_smp_ops octeon_smp_ops = {
 431         .send_ipi_single        = octeon_send_ipi_single,
 432         .send_ipi_mask          = octeon_send_ipi_mask,
 433         .init_secondary         = octeon_init_secondary,
 434         .smp_finish             = octeon_smp_finish,
 435         .cpus_done              = octeon_cpus_done,
 436         .boot_secondary         = octeon_boot_secondary,
 437         .smp_setup              = octeon_smp_setup,
 438         .prepare_cpus           = octeon_prepare_cpus,
 439 #ifdef CONFIG_HOTPLUG_CPU
 440         .cpu_disable            = octeon_cpu_disable,
 441         .cpu_die                = octeon_cpu_die,
 442 #endif
 443 };