arch/arm/cpu/armv8/fsl-layerscape/mp.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2014-2015 Freescale Semiconductor, Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <cpu_func.h>
   8 #include <image.h>
   9 #include <log.h>
  10 #include <asm/cache.h>
  11 #include <asm/io.h>
  12 #include <asm/system.h>
  13 #include <asm/arch/mp.h>
  14 #include <asm/arch/soc.h>
  15 #include <linux/delay.h>
  16 #include "cpu.h"
  17 #include <asm/arch-fsl-layerscape/soc.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 void *get_spin_tbl_addr(void)
  22 {
  23         return &__spin_table;
  24 }
  25
  26 void update_os_arch_secondary_cores(uint8_t os_arch)
  27 {
  28         u64 *table = get_spin_tbl_addr();
  29         int i;
  30
  31         for (i = 1; i < CONFIG_MAX_CPUS; i++) {
  32                 if (os_arch == IH_ARCH_DEFAULT)
  33                         table[i * WORDS_PER_SPIN_TABLE_ENTRY +
  34                                 SPIN_TABLE_ELEM_ARCH_COMP_IDX] = OS_ARCH_SAME;
  35                 else
  36                         table[i * WORDS_PER_SPIN_TABLE_ENTRY +
  37                                 SPIN_TABLE_ELEM_ARCH_COMP_IDX] = OS_ARCH_DIFF;
  38         }
  39 }
  40
  41 #ifdef CONFIG_FSL_LSCH3
  42 void wake_secondary_core_n(int cluster, int core, int cluster_cores)
  43 {
  44         struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
  45         struct ccsr_reset __iomem *rst = (void *)(CONFIG_SYS_FSL_RST_ADDR);
  46         u32 mpidr = 0;
  47
  48         mpidr = ((cluster << 8) | core);
  49         /*
  50          * mpidr_el1 register value of core which needs to be released
  51          * is written to scratchrw[6] register
  52          */
  53         gur_out32(&gur->scratchrw[6], mpidr);
  54         asm volatile("dsb st" : : : "memory");
  55         rst->brrl |= 1 << ((cluster * cluster_cores) + core);
  56         asm volatile("dsb st" : : : "memory");
  57         /*
  58          * scratchrw[6] register value is polled
  59          * when the value becomes zero, this means that this core is up
  60          * and running, next core can be released now
  61          */
  62         while (gur_in32(&gur->scratchrw[6]) != 0)
  63                 ;
  64 }
  65 #endif
  66
  67 int fsl_layerscape_wake_seconday_cores(void)
  68 {
  69         struct ccsr_gur __iomem *gur = (void *)(CONFIG_SYS_FSL_GUTS_ADDR);
  70 #ifdef CONFIG_FSL_LSCH3
  71         struct ccsr_reset __iomem *rst = (void *)(CONFIG_SYS_FSL_RST_ADDR);
  72         u32 svr, ver, cluster, type;
  73         int j = 0, cluster_cores = 0;
  74 #elif defined(CONFIG_FSL_LSCH2)
  75         struct ccsr_scfg __iomem *scfg = (void *)(CONFIG_SYS_FSL_SCFG_ADDR);
  76 #endif
  77         u32 cores, cpu_up_mask = 1;
  78         int i, timeout = 10;
  79         u64 *table;
  80
  81 #ifdef COUNTER_FREQUENCY_REAL
  82         /* update for secondary cores */
  83         __real_cntfrq = COUNTER_FREQUENCY_REAL;
  84         flush_dcache_range((unsigned long)&__real_cntfrq,
  85                            (unsigned long)&__real_cntfrq + 8);
  86 #endif
  87
  88         cores = cpu_mask();
  89         /* Clear spin table so that secondary processors
  90          * observe the correct value after waking up from wfe.
  91          */
  92         table = get_spin_tbl_addr();
  93         memset(table, 0, CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE);
  94         flush_dcache_range((unsigned long)table,
  95                            (unsigned long)table +
  96                            (CONFIG_MAX_CPUS*SPIN_TABLE_ELEM_SIZE));
  97
  98         debug("Waking secondary cores to start from %lx\n", gd->relocaddr);
  99
 100 #ifdef CONFIG_FSL_LSCH3
 101         gur_out32(&gur->bootlocptrh, (u32)(gd->relocaddr >> 32));
 102         gur_out32(&gur->bootlocptrl, (u32)gd->relocaddr);
 103
 104         svr = gur_in32(&gur->svr);
 105         ver = SVR_SOC_VER(svr);
 106         if (ver == SVR_LS2080A || ver == SVR_LS2085A) {
 107                 gur_out32(&gur->scratchrw[6], 1);
 108                 asm volatile("dsb st" : : : "memory");
 109                 rst->brrl = cores;
 110                 asm volatile("dsb st" : : : "memory");
 111         } else {
 112                 /*
 113                  * Release the cores out of reset one-at-a-time to avoid
 114                  * power spikes
 115                  */
 116                 i = 0;
 117                 cluster = in_le32(&gur->tp_cluster[i].lower);
 118                 for (j = 0; j < TP_INIT_PER_CLUSTER; j++) {
 119                         type = initiator_type(cluster, j);
 120                         if (type &&
 121                             TP_ITYP_TYPE(type) == TP_ITYP_TYPE_ARM)
 122                                 cluster_cores++;
 123                 }
 124
 125                 do {
 126                         cluster = in_le32(&gur->tp_cluster[i].lower);
 127                         for (j = 0; j < TP_INIT_PER_CLUSTER; j++) {
 128                                 type = initiator_type(cluster, j);
 129                                 if (type &&
 130                                     TP_ITYP_TYPE(type) == TP_ITYP_TYPE_ARM)
 131                                         wake_secondary_core_n(i, j,
 132                                                               cluster_cores);
 133                         }
 134                 i++;
 135                 } while ((cluster & TP_CLUSTER_EOC) != TP_CLUSTER_EOC);
 136         }
 137 #elif defined(CONFIG_FSL_LSCH2)
 138         scfg_out32(&scfg->scratchrw[0], (u32)(gd->relocaddr >> 32));
 139         scfg_out32(&scfg->scratchrw[1], (u32)gd->relocaddr);
 140         asm volatile("dsb st" : : : "memory");
 141         gur_out32(&gur->brrl, cores);
 142         asm volatile("dsb st" : : : "memory");
 143
 144         /* Bootup online cores */
 145         scfg_out32(&scfg->corebcr, cores);
 146 #endif
 147         /* This is needed as a precautionary measure.
 148          * If some code before this has accidentally  released the secondary
 149          * cores then the pre-bootloader code will trap them in a "wfe" unless
 150          * the scratchrw[6] is set. In this case we need a sev here to get these
 151          * cores moving again.
 152          */
 153         asm volatile("sev");
 154
 155         while (timeout--) {
 156                 flush_dcache_range((unsigned long)table, (unsigned long)table +
 157                                    CONFIG_MAX_CPUS * 64);
 158                 for (i = 1; i < CONFIG_MAX_CPUS; i++) {
 159                         if (table[i * WORDS_PER_SPIN_TABLE_ENTRY +
 160                                         SPIN_TABLE_ELEM_STATUS_IDX])
 161                                 cpu_up_mask |= 1 << i;
 162                 }
 163                 if (hweight32(cpu_up_mask) == hweight32(cores))
 164                         break;
 165                 udelay(10);
 166         }
 167         if (timeout <= 0) {
 168                 printf("CPU:   Failed to bring up some cores (mask 0x%x)\n",
 169                        cores ^ cpu_up_mask);
 170                 return 1;
 171         }
 172         printf("CPU:   %d cores online\n", hweight32(cores));
 173
 174         return 0;
 175 }
 176
 177 int is_core_valid(unsigned int core)
 178 {
 179         return !!((1 << core) & cpu_mask());
 180 }
 181
 182 static int is_pos_valid(unsigned int pos)
 183 {
 184         return !!((1 << pos) & cpu_pos_mask());
 185 }
 186
 187 int is_core_online(u64 cpu_id)
 188 {
 189         u64 *table = get_spin_tbl_addr();
 190         int pos = id_to_core(cpu_id);
 191         table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
 192         return table[SPIN_TABLE_ELEM_STATUS_IDX] == 1;
 193 }
 194
 195 int cpu_reset(u32 nr)
 196 {
 197         puts("Feature is not implemented.\n");
 198
 199         return 0;
 200 }
 201
 202 int cpu_disable(u32 nr)
 203 {
 204         puts("Feature is not implemented.\n");
 205
 206         return 0;
 207 }
 208
 209 static int core_to_pos(int nr)
 210 {
 211         u32 cores = cpu_pos_mask();
 212         int i, count = 0;
 213
 214         if (nr == 0) {
 215                 return 0;
 216         } else if (nr >= hweight32(cores)) {
 217                 puts("Not a valid core number.\n");
 218                 return -1;
 219         }
 220
 221         for (i = 1; i < 32; i++) {
 222                 if (is_pos_valid(i)) {
 223                         count++;
 224                         if (count == nr)
 225                                 break;
 226                 }
 227         }
 228
 229         if (count != nr)
 230                 return -1;
 231
 232         return i;
 233 }
 234
 235 int cpu_status(u32 nr)
 236 {
 237         u64 *table = get_spin_tbl_addr();
 238         int pos;
 239
 240         if (nr == 0) {
 241                 printf("table base @ 0x%p\n", table);
 242         } else {
 243                 pos = core_to_pos(nr);
 244                 if (pos < 0)
 245                         return -1;
 246                 table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
 247                 printf("table @ 0x%p\n", table);
 248                 printf("   addr - 0x%016llx\n",
 249                        table[SPIN_TABLE_ELEM_ENTRY_ADDR_IDX]);
 250                 printf("   status   - 0x%016llx\n",
 251                        table[SPIN_TABLE_ELEM_STATUS_IDX]);
 252                 printf("   lpid  - 0x%016llx\n",
 253                        table[SPIN_TABLE_ELEM_LPID_IDX]);
 254         }
 255
 256         return 0;
 257 }
 258
 259 int cpu_release(u32 nr, int argc, char *const argv[])
 260 {
 261         u64 boot_addr;
 262         u64 *table = get_spin_tbl_addr();
 263         int pos;
 264
 265         pos = core_to_pos(nr);
 266         if (pos <= 0)
 267                 return -1;
 268
 269         table += pos * WORDS_PER_SPIN_TABLE_ENTRY;
 270         boot_addr = simple_strtoull(argv[0], NULL, 16);
 271         table[SPIN_TABLE_ELEM_ENTRY_ADDR_IDX] = boot_addr;
 272         flush_dcache_range((unsigned long)table,
 273                            (unsigned long)table + SPIN_TABLE_ELEM_SIZE);
 274         asm volatile("dsb st");
 275
 276         /*
 277          * The secondary CPUs polling the spin-table above for a non-zero
 278          * value. To save power "wfe" is called. Thus call "sev" here to
 279          * wake the CPUs and let them check the spin-table again (see
 280          * slave_cpu loop in lowlevel.S)
 281          */
 282         asm volatile("sev");
 283
 284         return 0;
 285 }