arch/arm/mach-hisi/platsmp.c

   1 /*
   2  * Copyright (c) 2013 Linaro Ltd.
   3  * Copyright (c) 2013 Hisilicon Limited.
   4  * Based on arch/arm/mach-vexpress/platsmp.c, Copyright (C) 2002 ARM Ltd.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  */
  10 #include <linux/smp.h>
  11 #include <linux/io.h>
  12 #include <linux/of_address.h>
  13
  14 #include <asm/cacheflush.h>
  15 #include <asm/smp_plat.h>
  16 #include <asm/smp_scu.h>
  17
  18 #include "core.h"
  19
  20 static void __iomem *ctrl_base;
  21
  22 void hi3xxx_set_cpu_jump(int cpu, void *jump_addr)
  23 {
  24         cpu = cpu_logical_map(cpu);
  25         if (!cpu || !ctrl_base)
  26                 return;
  27         writel_relaxed(virt_to_phys(jump_addr), ctrl_base + ((cpu - 1) << 2));
  28 }
  29
  30 int hi3xxx_get_cpu_jump(int cpu)
  31 {
  32         cpu = cpu_logical_map(cpu);
  33         if (!cpu || !ctrl_base)
  34                 return 0;
  35         return readl_relaxed(ctrl_base + ((cpu - 1) << 2));
  36 }
  37
  38 static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus)
  39 {
  40         struct device_node *np = NULL;
  41         unsigned long base = 0;
  42         u32 offset = 0;
  43         void __iomem *scu_base = NULL;
  44
  45         if (scu_a9_has_base()) {
  46                 base = scu_a9_get_base();
  47                 scu_base = ioremap(base, SZ_4K);
  48                 if (!scu_base) {
  49                         pr_err("ioremap(scu_base) failed\n");
  50                         return;
  51                 }
  52                 scu_enable(scu_base);
  53                 iounmap(scu_base);
  54         }
  55         if (!ctrl_base) {
  56                 np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
  57                 if (!np) {
  58                         pr_err("failed to find hisilicon,sysctrl node\n");
  59                         return;
  60                 }
  61                 ctrl_base = of_iomap(np, 0);
  62                 if (!ctrl_base) {
  63                         pr_err("failed to map address\n");
  64                         return;
  65                 }
  66                 if (of_property_read_u32(np, "smp-offset", &offset) < 0) {
  67                         pr_err("failed to find smp-offset property\n");
  68                         return;
  69                 }
  70                 ctrl_base += offset;
  71         }
  72 }
  73
  74 static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
  75 {
  76         hi3xxx_set_cpu(cpu, true);
  77         hi3xxx_set_cpu_jump(cpu, secondary_startup);
  78         arch_send_wakeup_ipi_mask(cpumask_of(cpu));
  79         return 0;
  80 }
  81
  82 struct smp_operations hi3xxx_smp_ops __initdata = {
  83         .smp_prepare_cpus       = hi3xxx_smp_prepare_cpus,
  84         .smp_boot_secondary     = hi3xxx_boot_secondary,
  85 #ifdef CONFIG_HOTPLUG_CPU
  86         .cpu_die                = hi3xxx_cpu_die,
  87         .cpu_kill               = hi3xxx_cpu_kill,
  88 #endif
  89 };