LXR linux/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
  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
  30static unsigned int InitTLBStart_addr;
  31#endif
  32
  33static 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 */
  58void 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
  68static inline void octeon_send_ipi_mask(const struct cpumask *mask,
  69                                        unsigned int action)
  70{
  71        unsigned int i;
  72
  73        for_each_cpu_mask(i, *mask)
  74                octeon_send_ipi_single(i, action);
  75}
  76
  77/**
  78 * Detect available CPUs, populate cpu_possible_map
  79 */
  80static void octeon_smp_hotplug_setup(void)
  81{
  82#ifdef CONFIG_HOTPLUG_CPU
  83        uint32_t labi_signature;
  84
  85        labi_signature =
  86                cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
  87                                        LABI_ADDR_IN_BOOTLOADER +
  88                                        offsetof(struct linux_app_boot_info,
  89                                                    labi_signature)));
  90        if (labi_signature != LABI_SIGNATURE)
  91                pr_err("The bootloader version on this board is incorrect\n");
  92        InitTLBStart_addr =
  93                cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
  94                                   LABI_ADDR_IN_BOOTLOADER +
  95                                           offsetof(struct linux_app_boot_info,
  96                                                    InitTLBStart_addr)));
  97#endif
  98}
  99
 100static void octeon_smp_setup(void)
 101{
 102        const int coreid = cvmx_get_core_num();
 103        int cpus;
 104        int id;
 105
 106        int core_mask = octeon_get_boot_coremask();
 107
 108        cpus_clear(cpu_possible_map);
 109        __cpu_number_map[coreid] = 0;
 110        __cpu_logical_map[0] = coreid;
 111        cpu_set(0, cpu_possible_map);
 112
 113        cpus = 1;
 114        for (id = 0; id < 16; id++) {
 115                if ((id != coreid) && (core_mask & (1 << id))) {
 116                        cpu_set(cpus, cpu_possible_map);
 117                        __cpu_number_map[id] = cpus;
 118                        __cpu_logical_map[cpus] = id;
 119                        cpus++;
 120                }
 121        }
 122        cpu_present_map = cpu_possible_map;
 123
 124        octeon_smp_hotplug_setup();
 125}
 126
 127/**
 128 * Firmware CPU startup hook
 129 *
 130 */
 131static void octeon_boot_secondary(int cpu, struct task_struct *idle)
 132{
 133        int count;
 134
 135        pr_info("SMP: Booting CPU%02d (CoreId %2d)...\n", cpu,
 136                cpu_logical_map(cpu));
 137
 138        octeon_processor_sp = __KSTK_TOS(idle);
 139        octeon_processor_gp = (unsigned long)(task_thread_info(idle));
 140        octeon_processor_boot = cpu_logical_map(cpu);
 141        mb();
 142
 143        count = 10000;
 144        while (octeon_processor_sp && count) {
 145                /* Waiting for processor to get the SP and GP */
 146                udelay(1);
 147                count--;
 148        }
 149        if (count == 0)
 150                pr_err("Secondary boot timeout\n");
 151}
 152
 153/**
 154 * After we've done initial boot, this function is called to allow the
 155 * board code to clean up state, if needed
 156 */
 157static void octeon_init_secondary(void)
 158{
 159        const int coreid = cvmx_get_core_num();
 160        union cvmx_ciu_intx_sum0 interrupt_enable;
 161
 162#ifdef CONFIG_HOTPLUG_CPU
 163        unsigned int cur_exception_base;
 164
 165        cur_exception_base = cvmx_read64_uint32(
 166                CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 167                             LABI_ADDR_IN_BOOTLOADER +
 168                             offsetof(struct linux_app_boot_info,
 169                                      cur_exception_base)));
 170        /* cur_exception_base is incremented in bootloader after setting */
 171        write_c0_ebase((unsigned int)(cur_exception_base - EXCEPTION_BASE_INCR));
 172#endif
 173        octeon_check_cpu_bist();
 174        octeon_init_cvmcount();
 175        /*
 176        pr_info("SMP: CPU%d (CoreId %lu) started\n", cpu, coreid);
 177        */
 178        /* Enable Mailbox interrupts to this core. These are the only
 179           interrupts allowed on line 3 */
 180        cvmx_write_csr(CVMX_CIU_MBOX_CLRX(coreid), 0xffffffff);
 181        interrupt_enable.u64 = 0;
 182        interrupt_enable.s.mbox = 0x3;
 183        cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2)), interrupt_enable.u64);
 184        cvmx_write_csr(CVMX_CIU_INTX_EN0((coreid * 2 + 1)), 0);
 185        cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2)), 0);
 186        cvmx_write_csr(CVMX_CIU_INTX_EN1((coreid * 2 + 1)), 0);
 187        /* Enable core interrupt processing for 2,3 and 7 */
 188        set_c0_status(0x8c01);
 189}
 190
 191/**
 192 * Callout to firmware before smp_init
 193 *
 194 */
 195void octeon_prepare_cpus(unsigned int max_cpus)
 196{
 197        cvmx_write_csr(CVMX_CIU_MBOX_CLRX(cvmx_get_core_num()), 0xffffffff);
 198        if (request_irq(OCTEON_IRQ_MBOX0, mailbox_interrupt, IRQF_DISABLED,
 199                        "mailbox0", mailbox_interrupt)) {
 200                panic("Cannot request_irq(OCTEON_IRQ_MBOX0)\n");
 201        }
 202        if (request_irq(OCTEON_IRQ_MBOX1, mailbox_interrupt, IRQF_DISABLED,
 203                        "mailbox1", mailbox_interrupt)) {
 204                panic("Cannot request_irq(OCTEON_IRQ_MBOX1)\n");
 205        }
 206}
 207
 208/**
 209 * Last chance for the board code to finish SMP initialization before
 210 * the CPU is "online".
 211 */
 212static void octeon_smp_finish(void)
 213{
 214#ifdef CONFIG_CAVIUM_GDB
 215        unsigned long tmp;
 216        /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
 217           to be not masked by this core so we know the signal is received by
 218           someone */
 219        asm volatile ("dmfc0 %0, $22\n"
 220                      "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
 221#endif
 222
 223        octeon_user_io_init();
 224
 225        /* to generate the first CPU timer interrupt */
 226        write_c0_compare(read_c0_count() + mips_hpt_frequency / HZ);
 227}
 228
 229/**
 230 * Hook for after all CPUs are online
 231 */
 232static void octeon_cpus_done(void)
 233{
 234#ifdef CONFIG_CAVIUM_GDB
 235        unsigned long tmp;
 236        /* Pulse MCD0 signal on Ctrl-C to stop all the cores. Also set the MCD0
 237           to be not masked by this core so we know the signal is received by
 238           someone */
 239        asm volatile ("dmfc0 %0, $22\n"
 240                      "ori   %0, %0, 0x9100\n" "dmtc0 %0, $22\n" : "=r" (tmp));
 241#endif
 242}
 243
 244#ifdef CONFIG_HOTPLUG_CPU
 245
 246/* State of each CPU. */
 247DEFINE_PER_CPU(int, cpu_state);
 248
 249extern void fixup_irqs(void);
 250
 251static DEFINE_SPINLOCK(smp_reserve_lock);
 252
 253static int octeon_cpu_disable(void)
 254{
 255        unsigned int cpu = smp_processor_id();
 256
 257        if (cpu == 0)
 258                return -EBUSY;
 259
 260        spin_lock(&smp_reserve_lock);
 261
 262        cpu_clear(cpu, cpu_online_map);
 263        cpu_clear(cpu, cpu_callin_map);
 264        local_irq_disable();
 265        fixup_irqs();
 266        local_irq_enable();
 267
 268        flush_cache_all();
 269        local_flush_tlb_all();
 270
 271        spin_unlock(&smp_reserve_lock);
 272
 273        return 0;
 274}
 275
 276static void octeon_cpu_die(unsigned int cpu)
 277{
 278        int coreid = cpu_logical_map(cpu);
 279        uint32_t avail_coremask;
 280        struct cvmx_bootmem_named_block_desc *block_desc;
 281
 282        while (per_cpu(cpu_state, cpu) != CPU_DEAD)
 283                cpu_relax();
 284
 285        /*
 286         * This is a bit complicated strategics of getting/settig available
 287         * cores mask, copied from bootloader
 288         */
 289        /* LINUX_APP_BOOT_BLOCK is initialized in bootoct binary */
 290        block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
 291
 292        if (!block_desc) {
 293                avail_coremask =
 294                        cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 295                                                   LABI_ADDR_IN_BOOTLOADER +
 296                                                   offsetof
 297                                                   (struct linux_app_boot_info,
 298                                                    avail_coremask)));
 299        } else {                       /* alternative, already initialized */
 300               avail_coremask =
 301                   cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 302                                                   block_desc->base_addr +
 303                                                  AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
 304        }
 305
 306        avail_coremask |= 1 << coreid;
 307
 308        /* Setting avail_coremask for bootoct binary */
 309        if (!block_desc) {
 310                cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 311                                                LABI_ADDR_IN_BOOTLOADER +
 312                                                offsetof(struct linux_app_boot_info,
 313                                                         avail_coremask)),
 314                                   avail_coremask);
 315        } else {
 316                cvmx_write64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 317                                                block_desc->base_addr +
 318                                                AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK),
 319                                   avail_coremask);
 320        }
 321
 322        pr_info("Reset core %d. Available Coremask = %x\n", coreid,
 323                avail_coremask);
 324        cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 325        cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 326}
 327
 328void play_dead(void)
 329{
 330        int coreid = cvmx_get_core_num();
 331
 332        idle_task_exit();
 333        octeon_processor_boot = 0xff;
 334        per_cpu(cpu_state, coreid) = CPU_DEAD;
 335
 336        while (1)       /* core will be reset here */
 337                ;
 338}
 339
 340extern void kernel_entry(unsigned long arg1, ...);
 341
 342static void start_after_reset(void)
 343{
 344        kernel_entry(0, 0, 0);  /* set a2 = 0 for secondary core */
 345}
 346
 347int octeon_update_boot_vector(unsigned int cpu)
 348{
 349
 350        int coreid = cpu_logical_map(cpu);
 351        unsigned int avail_coremask;
 352        struct cvmx_bootmem_named_block_desc *block_desc;
 353        struct boot_init_vector *boot_vect =
 354                (struct boot_init_vector *) cvmx_phys_to_ptr(0x0 +
 355                                                  BOOTLOADER_BOOT_VECTOR);
 356
 357        block_desc = cvmx_bootmem_find_named_block(LINUX_APP_BOOT_BLOCK_NAME);
 358
 359        if (!block_desc) {
 360                avail_coremask =
 361                        cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 362                                           LABI_ADDR_IN_BOOTLOADER +
 363                                                offsetof(struct linux_app_boot_info,
 364                                                avail_coremask)));
 365        } else {                       /* alternative, already initialized */
 366               avail_coremask =
 367                   cvmx_read64_uint32(CVMX_ADD_SEG(CVMX_MIPS_SPACE_XKPHYS,
 368                                                   block_desc->base_addr +
 369                                                   AVAIL_COREMASK_OFFSET_IN_LINUX_APP_BOOT_BLOCK));
 370        }
 371
 372        if (!(avail_coremask & (1 << coreid))) {
 373                /* core not available, assume, that catched by simple-executive */
 374                cvmx_write_csr(CVMX_CIU_PP_RST, 1 << coreid);
 375                cvmx_write_csr(CVMX_CIU_PP_RST, 0);
 376        }
 377
 378        boot_vect[coreid].app_start_func_addr =
 379                (uint32_t) (unsigned long) start_after_reset;
 380        boot_vect[coreid].code_addr = InitTLBStart_addr;
 381
 382        CVMX_SYNC;
 383
 384        cvmx_write_csr(CVMX_CIU_NMI, (1 << coreid) & avail_coremask);
 385
 386        return 0;
 387}
 388
 389static int __cpuinit octeon_cpu_callback(struct notifier_block *nfb,
 390        unsigned long action, void *hcpu)
 391{
 392        unsigned int cpu = (unsigned long)hcpu;
 393
 394        switch (action) {
 395        case CPU_UP_PREPARE:
 396                octeon_update_boot_vector(cpu);
 397                break;
 398        case CPU_ONLINE:
 399                pr_info("Cpu %d online\n", cpu);
 400                break;
 401        case CPU_DEAD:
 402                break;
 403        }
 404
 405        return NOTIFY_OK;
 406}
 407
 408static struct notifier_block __cpuinitdata octeon_cpu_notifier = {
 409        .notifier_call = octeon_cpu_callback,
 410};
 411
 412static int __cpuinit register_cavium_notifier(void)
 413{
 414        register_hotcpu_notifier(&octeon_cpu_notifier);
 415
 416        return 0;
 417}
 418
 419late_initcall(register_cavium_notifier);
 420
 421#endif  /* CONFIG_HOTPLUG_CPU */
 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