arch/mips/netlogic/xlp/wakeup.c

   1 /*
   2  * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
   3  * reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the NetLogic
   9  * license below:
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  *
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in
  19  *    the documentation and/or other materials provided with the
  20  *    distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
  23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  24  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  30  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  31  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  32  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/kernel.h>
  36 #include <linux/threads.h>
  37
  38 #include <asm/asm.h>
  39 #include <asm/asm-offsets.h>
  40 #include <asm/mipsregs.h>
  41 #include <asm/addrspace.h>
  42 #include <asm/string.h>
  43
  44 #include <asm/netlogic/haldefs.h>
  45 #include <asm/netlogic/common.h>
  46 #include <asm/netlogic/mips-extns.h>
  47
  48 #include <asm/netlogic/xlp-hal/iomap.h>
  49 #include <asm/netlogic/xlp-hal/xlp.h>
  50 #include <asm/netlogic/xlp-hal/pic.h>
  51 #include <asm/netlogic/xlp-hal/sys.h>
  52
  53 static int xlp_wakeup_core(uint64_t sysbase, int node, int core)
  54 {
  55         uint32_t coremask, value;
  56         int count, resetreg;
  57
  58         coremask = (1 << core);
  59
  60         /* Enable CPU clock in case of 8xx/3xx */
  61         if (!cpu_is_xlpii()) {
  62                 value = nlm_read_sys_reg(sysbase, SYS_CORE_DFS_DIS_CTRL);
  63                 value &= ~coremask;
  64                 nlm_write_sys_reg(sysbase, SYS_CORE_DFS_DIS_CTRL, value);
  65         }
  66
  67         /* On 9XX, mark coherent first */
  68         if (cpu_is_xlp9xx()) {
  69                 value = nlm_read_sys_reg(sysbase, SYS_9XX_CPU_NONCOHERENT_MODE);
  70                 value &= ~coremask;
  71                 nlm_write_sys_reg(sysbase, SYS_9XX_CPU_NONCOHERENT_MODE, value);
  72         }
  73
  74         /* Remove CPU Reset */
  75         resetreg = cpu_is_xlp9xx() ? SYS_9XX_CPU_RESET : SYS_CPU_RESET;
  76         value = nlm_read_sys_reg(sysbase, resetreg);
  77         value &= ~coremask;
  78         nlm_write_sys_reg(sysbase, resetreg, value);
  79
  80         /* We are done on 9XX */
  81         if (cpu_is_xlp9xx())
  82                 return 1;
  83
  84         /* Poll for CPU to mark itself coherent on other type of XLP */
  85         count = 100000;
  86         do {
  87                 value = nlm_read_sys_reg(sysbase, SYS_CPU_NONCOHERENT_MODE);
  88         } while ((value & coremask) != 0 && --count > 0);
  89
  90         return count != 0;
  91 }
  92
  93 static int wait_for_cpus(int cpu, int bootcpu)
  94 {
  95         volatile uint32_t *cpu_ready = nlm_get_boot_data(BOOT_CPU_READY);
  96         int i, count, notready;
  97
  98         count = 0x800000;
  99         do {
 100                 notready = nlm_threads_per_core;
 101                 for (i = 0; i < nlm_threads_per_core; i++)
 102                         if (cpu_ready[cpu + i] || cpu == bootcpu)
 103                                 --notready;
 104         } while (notready != 0 && --count > 0);
 105
 106         return count != 0;
 107 }
 108
 109 static void xlp_enable_secondary_cores(const cpumask_t *wakeup_mask)
 110 {
 111         struct nlm_soc_info *nodep;
 112         uint64_t syspcibase, fusebase;
 113         uint32_t syscoremask, mask, fusemask;
 114         int core, n, cpu;
 115
 116         for (n = 0; n < NLM_NR_NODES; n++) {
 117                 if (n != 0) {
 118                         /* check if node exists and is online */
 119                         if (cpu_is_xlp9xx()) {
 120                                 int b = xlp9xx_get_socbus(n);
 121                                 pr_info("Node %d SoC PCI bus %d.\n", n, b);
 122                                 if (b == 0)
 123                                         break;
 124                         } else {
 125                                 syspcibase = nlm_get_sys_pcibase(n);
 126                                 if (nlm_read_reg(syspcibase, 0) == 0xffffffff)
 127                                         break;
 128                         }
 129                         nlm_node_init(n);
 130                 }
 131
 132                 /* read cores in reset from SYS */
 133                 nodep = nlm_get_node(n);
 134
 135                 if (cpu_is_xlp9xx()) {
 136                         fusebase = nlm_get_fuse_regbase(n);
 137                         fusemask = nlm_read_reg(fusebase, FUSE_9XX_DEVCFG6);
 138                         mask = 0xfffff;
 139                 } else {
 140                         fusemask = nlm_read_sys_reg(nodep->sysbase,
 141                                                 SYS_EFUSE_DEVICE_CFG_STATUS0);
 142                         switch (read_c0_prid() & 0xff00) {
 143                         case PRID_IMP_NETLOGIC_XLP3XX:
 144                                 mask = 0xf;
 145                                 break;
 146                         case PRID_IMP_NETLOGIC_XLP2XX:
 147                                 mask = 0x3;
 148                                 break;
 149                         case PRID_IMP_NETLOGIC_XLP8XX:
 150                         default:
 151                                 mask = 0xff;
 152                                 break;
 153                         }
 154                 }
 155
 156                 /*
 157                  * Fused out cores are set in the fusemask, and the remaining
 158                  * cores are renumbered to range 0 .. nactive-1
 159                  */
 160                 syscoremask = (1 << hweight32(~fusemask & mask)) - 1;
 161
 162                 /* The boot cpu */
 163                 if (n == 0)
 164                         nodep->coremask = 1;
 165
 166                 pr_info("Node %d - SYS/FUSE coremask %x\n", n, syscoremask);
 167                 for (core = 0; core < nlm_cores_per_node(); core++) {
 168                         /* we will be on node 0 core 0 */
 169                         if (n == 0 && core == 0)
 170                                 continue;
 171
 172                         /* see if the core exists */
 173                         if ((syscoremask & (1 << core)) == 0)
 174                                 continue;
 175
 176                         /* see if at least the first hw thread is enabled */
 177                         cpu = (n * nlm_cores_per_node() + core)
 178                                                 * NLM_THREADS_PER_CORE;
 179                         if (!cpumask_test_cpu(cpu, wakeup_mask))
 180                                 continue;
 181
 182                         /* wake up the core */
 183                         if (!xlp_wakeup_core(nodep->sysbase, n, core))
 184                                 continue;
 185
 186                         /* core is up */
 187                         nodep->coremask |= 1u << core;
 188
 189                         /* spin until the hw threads sets their ready */
 190                         if (!wait_for_cpus(cpu, 0))
 191                                 pr_err("Node %d : timeout core %d\n", n, core);
 192                 }
 193         }
 194 }
 195
 196 void xlp_wakeup_secondary_cpus()
 197 {
 198         /*
 199          * In case of u-boot, the secondaries are in reset
 200          * first wakeup core 0 threads
 201          */
 202         xlp_boot_core0_siblings();
 203         if (!wait_for_cpus(0, 0))
 204                 pr_err("Node 0 : timeout core 0\n");
 205
 206         /* now get other cores out of reset */
 207         xlp_enable_secondary_cores(&nlm_cpumask);
 208 }