arch/arm/mach-hisi/platmcpm.c

   1 /*
   2  * Copyright (c) 2013-2014 Linaro Ltd.
   3  * Copyright (c) 2013-2014 Hisilicon Limited.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  */
   9 #include <linux/init.h>
  10 #include <linux/smp.h>
  11 #include <linux/delay.h>
  12 #include <linux/io.h>
  13 #include <linux/memblock.h>
  14 #include <linux/of_address.h>
  15
  16 #include <asm/cputype.h>
  17 #include <asm/cp15.h>
  18 #include <asm/cacheflush.h>
  19 #include <asm/smp.h>
  20 #include <asm/smp_plat.h>
  21
  22 #include "core.h"
  23
  24 /* bits definition in SC_CPU_RESET_REQ[x]/SC_CPU_RESET_DREQ[x]
  25  * 1 -- unreset; 0 -- reset
  26  */
  27 #define CORE_RESET_BIT(x)               (1 << x)
  28 #define NEON_RESET_BIT(x)               (1 << (x + 4))
  29 #define CORE_DEBUG_RESET_BIT(x)         (1 << (x + 9))
  30 #define CLUSTER_L2_RESET_BIT            (1 << 8)
  31 #define CLUSTER_DEBUG_RESET_BIT         (1 << 13)
  32
  33 /*
  34  * bits definition in SC_CPU_RESET_STATUS[x]
  35  * 1 -- reset status; 0 -- unreset status
  36  */
  37 #define CORE_RESET_STATUS(x)            (1 << x)
  38 #define NEON_RESET_STATUS(x)            (1 << (x + 4))
  39 #define CORE_DEBUG_RESET_STATUS(x)      (1 << (x + 9))
  40 #define CLUSTER_L2_RESET_STATUS         (1 << 8)
  41 #define CLUSTER_DEBUG_RESET_STATUS      (1 << 13)
  42 #define CORE_WFI_STATUS(x)              (1 << (x + 16))
  43 #define CORE_WFE_STATUS(x)              (1 << (x + 20))
  44 #define CORE_DEBUG_ACK(x)               (1 << (x + 24))
  45
  46 #define SC_CPU_RESET_REQ(x)             (0x520 + (x << 3))      /* reset */
  47 #define SC_CPU_RESET_DREQ(x)            (0x524 + (x << 3))      /* unreset */
  48 #define SC_CPU_RESET_STATUS(x)          (0x1520 + (x << 3))
  49
  50 #define FAB_SF_MODE                     0x0c
  51 #define FAB_SF_INVLD                    0x10
  52
  53 /* bits definition in FB_SF_INVLD */
  54 #define FB_SF_INVLD_START               (1 << 8)
  55
  56 #define HIP04_MAX_CLUSTERS              4
  57 #define HIP04_MAX_CPUS_PER_CLUSTER      4
  58
  59 #define POLL_MSEC       10
  60 #define TIMEOUT_MSEC    1000
  61
  62 static void __iomem *sysctrl, *fabric;
  63 static int hip04_cpu_table[HIP04_MAX_CLUSTERS][HIP04_MAX_CPUS_PER_CLUSTER];
  64 static DEFINE_SPINLOCK(boot_lock);
  65 static u32 fabric_phys_addr;
  66 /*
  67  * [0]: bootwrapper physical address
  68  * [1]: bootwrapper size
  69  * [2]: relocation address
  70  * [3]: relocation size
  71  */
  72 static u32 hip04_boot_method[4];
  73
  74 static bool hip04_cluster_is_down(unsigned int cluster)
  75 {
  76         int i;
  77
  78         for (i = 0; i < HIP04_MAX_CPUS_PER_CLUSTER; i++)
  79                 if (hip04_cpu_table[cluster][i])
  80                         return false;
  81         return true;
  82 }
  83
  84 static void hip04_set_snoop_filter(unsigned int cluster, unsigned int on)
  85 {
  86         unsigned long data;
  87
  88         if (!fabric)
  89                 BUG();
  90         data = readl_relaxed(fabric + FAB_SF_MODE);
  91         if (on)
  92                 data |= 1 << cluster;
  93         else
  94                 data &= ~(1 << cluster);
  95         writel_relaxed(data, fabric + FAB_SF_MODE);
  96         do {
  97                 cpu_relax();
  98         } while (data != readl_relaxed(fabric + FAB_SF_MODE));
  99 }
 100
 101 static int hip04_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
 102 {
 103         unsigned int mpidr, cpu, cluster;
 104         unsigned long data;
 105         void __iomem *sys_dreq, *sys_status;
 106
 107         mpidr = cpu_logical_map(l_cpu);
 108         cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 109         cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 110
 111         if (!sysctrl)
 112                 return -ENODEV;
 113         if (cluster >= HIP04_MAX_CLUSTERS || cpu >= HIP04_MAX_CPUS_PER_CLUSTER)
 114                 return -EINVAL;
 115
 116         spin_lock_irq(&boot_lock);
 117
 118         if (hip04_cpu_table[cluster][cpu])
 119                 goto out;
 120
 121         sys_dreq = sysctrl + SC_CPU_RESET_DREQ(cluster);
 122         sys_status = sysctrl + SC_CPU_RESET_STATUS(cluster);
 123         if (hip04_cluster_is_down(cluster)) {
 124                 data = CLUSTER_DEBUG_RESET_BIT;
 125                 writel_relaxed(data, sys_dreq);
 126                 do {
 127                         cpu_relax();
 128                         data = readl_relaxed(sys_status);
 129                 } while (data & CLUSTER_DEBUG_RESET_STATUS);
 130                 hip04_set_snoop_filter(cluster, 1);
 131         }
 132
 133         data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
 134                CORE_DEBUG_RESET_BIT(cpu);
 135         writel_relaxed(data, sys_dreq);
 136         do {
 137                 cpu_relax();
 138         } while (data == readl_relaxed(sys_status));
 139
 140         /*
 141          * We may fail to power up core again without this delay.
 142          * It's not mentioned in document. It's found by test.
 143          */
 144         udelay(20);
 145
 146         arch_send_wakeup_ipi_mask(cpumask_of(l_cpu));
 147
 148 out:
 149         hip04_cpu_table[cluster][cpu]++;
 150         spin_unlock_irq(&boot_lock);
 151
 152         return 0;
 153 }
 154
 155 #ifdef CONFIG_HOTPLUG_CPU
 156 static void hip04_cpu_die(unsigned int l_cpu)
 157 {
 158         unsigned int mpidr, cpu, cluster;
 159         bool last_man;
 160
 161         mpidr = cpu_logical_map(l_cpu);
 162         cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 163         cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 164
 165         spin_lock(&boot_lock);
 166         hip04_cpu_table[cluster][cpu]--;
 167         if (hip04_cpu_table[cluster][cpu] == 1) {
 168                 /* A power_up request went ahead of us. */
 169                 spin_unlock(&boot_lock);
 170                 return;
 171         } else if (hip04_cpu_table[cluster][cpu] > 1) {
 172                 pr_err("Cluster %d CPU%d boots multiple times\n", cluster, cpu);
 173                 BUG();
 174         }
 175
 176         last_man = hip04_cluster_is_down(cluster);
 177         spin_unlock(&boot_lock);
 178         if (last_man) {
 179                 /* Since it's Cortex A15, disable L2 prefetching. */
 180                 asm volatile(
 181                 "mcr    p15, 1, %0, c15, c0, 3 \n\t"
 182                 "isb    \n\t"
 183                 "dsb    "
 184                 : : "r" (0x400) );
 185                 v7_exit_coherency_flush(all);
 186         } else {
 187                 v7_exit_coherency_flush(louis);
 188         }
 189
 190         for (;;)
 191                 wfi();
 192 }
 193
 194 static int hip04_cpu_kill(unsigned int l_cpu)
 195 {
 196         unsigned int mpidr, cpu, cluster;
 197         unsigned int data, tries, count;
 198
 199         mpidr = cpu_logical_map(l_cpu);
 200         cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 201         cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 202         BUG_ON(cluster >= HIP04_MAX_CLUSTERS ||
 203                cpu >= HIP04_MAX_CPUS_PER_CLUSTER);
 204
 205         count = TIMEOUT_MSEC / POLL_MSEC;
 206         spin_lock_irq(&boot_lock);
 207         for (tries = 0; tries < count; tries++) {
 208                 if (hip04_cpu_table[cluster][cpu])
 209                         goto err;
 210                 cpu_relax();
 211                 data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
 212                 if (data & CORE_WFI_STATUS(cpu))
 213                         break;
 214                 spin_unlock_irq(&boot_lock);
 215                 /* Wait for clean L2 when the whole cluster is down. */
 216                 msleep(POLL_MSEC);
 217                 spin_lock_irq(&boot_lock);
 218         }
 219         if (tries >= count)
 220                 goto err;
 221         data = CORE_RESET_BIT(cpu) | NEON_RESET_BIT(cpu) | \
 222                CORE_DEBUG_RESET_BIT(cpu);
 223         writel_relaxed(data, sysctrl + SC_CPU_RESET_REQ(cluster));
 224         for (tries = 0; tries < count; tries++) {
 225                 cpu_relax();
 226                 data = readl_relaxed(sysctrl + SC_CPU_RESET_STATUS(cluster));
 227                 if (data & CORE_RESET_STATUS(cpu))
 228                         break;
 229         }
 230         if (tries >= count)
 231                 goto err;
 232         if (hip04_cluster_is_down(cluster))
 233                 hip04_set_snoop_filter(cluster, 0);
 234         spin_unlock_irq(&boot_lock);
 235         return 1;
 236 err:
 237         spin_unlock_irq(&boot_lock);
 238         return 0;
 239 }
 240 #endif
 241
 242 static const struct smp_operations hip04_smp_ops __initconst = {
 243         .smp_boot_secondary     = hip04_boot_secondary,
 244 #ifdef CONFIG_HOTPLUG_CPU
 245         .cpu_die                = hip04_cpu_die,
 246         .cpu_kill               = hip04_cpu_kill,
 247 #endif
 248 };
 249
 250 static bool __init hip04_cpu_table_init(void)
 251 {
 252         unsigned int mpidr, cpu, cluster;
 253
 254         mpidr = read_cpuid_mpidr();
 255         cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
 256         cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
 257
 258         if (cluster >= HIP04_MAX_CLUSTERS ||
 259             cpu >= HIP04_MAX_CPUS_PER_CLUSTER) {
 260                 pr_err("%s: boot CPU is out of bound!\n", __func__);
 261                 return false;
 262         }
 263         hip04_set_snoop_filter(cluster, 1);
 264         hip04_cpu_table[cluster][cpu] = 1;
 265         return true;
 266 }
 267
 268 static int __init hip04_smp_init(void)
 269 {
 270         struct device_node *np, *np_sctl, *np_fab;
 271         struct resource fab_res;
 272         void __iomem *relocation;
 273         int ret = -ENODEV;
 274
 275         np = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-bootwrapper");
 276         if (!np)
 277                 goto err;
 278         ret = of_property_read_u32_array(np, "boot-method",
 279                                          &hip04_boot_method[0], 4);
 280         if (ret)
 281                 goto err;
 282         np_sctl = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
 283         if (!np_sctl)
 284                 goto err;
 285         np_fab = of_find_compatible_node(NULL, NULL, "hisilicon,hip04-fabric");
 286         if (!np_fab)
 287                 goto err;
 288
 289         ret = memblock_reserve(hip04_boot_method[0], hip04_boot_method[1]);
 290         if (ret)
 291                 goto err;
 292
 293         relocation = ioremap(hip04_boot_method[2], hip04_boot_method[3]);
 294         if (!relocation) {
 295                 pr_err("failed to map relocation space\n");
 296                 ret = -ENOMEM;
 297                 goto err_reloc;
 298         }
 299         sysctrl = of_iomap(np_sctl, 0);
 300         if (!sysctrl) {
 301                 pr_err("failed to get sysctrl base\n");
 302                 ret = -ENOMEM;
 303                 goto err_sysctrl;
 304         }
 305         ret = of_address_to_resource(np_fab, 0, &fab_res);
 306         if (ret) {
 307                 pr_err("failed to get fabric base phys\n");
 308                 goto err_fabric;
 309         }
 310         fabric_phys_addr = fab_res.start;
 311         sync_cache_w(&fabric_phys_addr);
 312         fabric = of_iomap(np_fab, 0);
 313         if (!fabric) {
 314                 pr_err("failed to get fabric base\n");
 315                 ret = -ENOMEM;
 316                 goto err_fabric;
 317         }
 318
 319         if (!hip04_cpu_table_init()) {
 320                 ret = -EINVAL;
 321                 goto err_table;
 322         }
 323
 324         /*
 325          * Fill the instruction address that is used after secondary core
 326          * out of reset.
 327          */
 328         writel_relaxed(hip04_boot_method[0], relocation);
 329         writel_relaxed(0xa5a5a5a5, relocation + 4);     /* magic number */
 330         writel_relaxed(__pa_symbol(secondary_startup), relocation + 8);
 331         writel_relaxed(0, relocation + 12);
 332         iounmap(relocation);
 333
 334         smp_set_ops(&hip04_smp_ops);
 335         return ret;
 336 err_table:
 337         iounmap(fabric);
 338 err_fabric:
 339         iounmap(sysctrl);
 340 err_sysctrl:
 341         iounmap(relocation);
 342 err_reloc:
 343         memblock_free(hip04_boot_method[0], hip04_boot_method[1]);
 344 err:
 345         return ret;
 346 }
 347 early_initcall(hip04_smp_init);