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 #define HIX5HD2_BOOT_ADDRESS            0xffff0000
  21
  22 static void __iomem *ctrl_base;
  23
  24 void hi3xxx_set_cpu_jump(int cpu, void *jump_addr)
  25 {
  26         cpu = cpu_logical_map(cpu);
  27         if (!cpu || !ctrl_base)
  28                 return;
  29         writel_relaxed(virt_to_phys(jump_addr), ctrl_base + ((cpu - 1) << 2));
  30 }
  31
  32 int hi3xxx_get_cpu_jump(int cpu)
  33 {
  34         cpu = cpu_logical_map(cpu);
  35         if (!cpu || !ctrl_base)
  36                 return 0;
  37         return readl_relaxed(ctrl_base + ((cpu - 1) << 2));
  38 }
  39
  40 static void __init hisi_enable_scu_a9(void)
  41 {
  42         unsigned long base = 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 }
  56
  57 static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus)
  58 {
  59         struct device_node *np = NULL;
  60         u32 offset = 0;
  61
  62         hisi_enable_scu_a9();
  63         if (!ctrl_base) {
  64                 np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
  65                 if (!np) {
  66                         pr_err("failed to find hisilicon,sysctrl node\n");
  67                         return;
  68                 }
  69                 ctrl_base = of_iomap(np, 0);
  70                 if (!ctrl_base) {
  71                         pr_err("failed to map address\n");
  72                         return;
  73                 }
  74                 if (of_property_read_u32(np, "smp-offset", &offset) < 0) {
  75                         pr_err("failed to find smp-offset property\n");
  76                         return;
  77                 }
  78                 ctrl_base += offset;
  79         }
  80 }
  81
  82 static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
  83 {
  84         hi3xxx_set_cpu(cpu, true);
  85         hi3xxx_set_cpu_jump(cpu, secondary_startup);
  86         arch_send_wakeup_ipi_mask(cpumask_of(cpu));
  87         return 0;
  88 }
  89
  90 struct smp_operations hi3xxx_smp_ops __initdata = {
  91         .smp_prepare_cpus       = hi3xxx_smp_prepare_cpus,
  92         .smp_boot_secondary     = hi3xxx_boot_secondary,
  93 #ifdef CONFIG_HOTPLUG_CPU
  94         .cpu_die                = hi3xxx_cpu_die,
  95         .cpu_kill               = hi3xxx_cpu_kill,
  96 #endif
  97 };
  98
  99 static void __init hix5hd2_smp_prepare_cpus(unsigned int max_cpus)
 100 {
 101         hisi_enable_scu_a9();
 102 }
 103
 104 void hix5hd2_set_scu_boot_addr(phys_addr_t start_addr, phys_addr_t jump_addr)
 105 {
 106         void __iomem *virt;
 107
 108         virt = ioremap(start_addr, PAGE_SIZE);
 109
 110         writel_relaxed(0xe51ff004, virt);       /* ldr pc, [rc, #-4] */
 111         writel_relaxed(jump_addr, virt + 4);    /* pc jump phy address */
 112         iounmap(virt);
 113 }
 114
 115 static int hix5hd2_boot_secondary(unsigned int cpu, struct task_struct *idle)
 116 {
 117         phys_addr_t jumpaddr;
 118
 119         jumpaddr = virt_to_phys(hix5hd2_secondary_startup);
 120         hix5hd2_set_scu_boot_addr(HIX5HD2_BOOT_ADDRESS, jumpaddr);
 121         hix5hd2_set_cpu(cpu, true);
 122         arch_send_wakeup_ipi_mask(cpumask_of(cpu));
 123         return 0;
 124 }
 125
 126
 127 struct smp_operations hix5hd2_smp_ops __initdata = {
 128         .smp_prepare_cpus       = hix5hd2_smp_prepare_cpus,
 129         .smp_boot_secondary     = hix5hd2_boot_secondary,
 130 #ifdef CONFIG_HOTPLUG_CPU
 131         .cpu_die                = hix5hd2_cpu_die,
 132 #endif
 133 };