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 #include <linux/delay.h>
  14
  15 #include <asm/cacheflush.h>
  16 #include <asm/smp_plat.h>
  17 #include <asm/smp_scu.h>
  18 #include <asm/mach/map.h>
  19
  20 #include "core.h"
  21
  22 #define HIX5HD2_BOOT_ADDRESS            0xffff0000
  23
  24 static void __iomem *ctrl_base;
  25
  26 void hi3xxx_set_cpu_jump(int cpu, void *jump_addr)
  27 {
  28         cpu = cpu_logical_map(cpu);
  29         if (!cpu || !ctrl_base)
  30                 return;
  31         writel_relaxed(__pa_symbol(jump_addr), ctrl_base + ((cpu - 1) << 2));
  32 }
  33
  34 int hi3xxx_get_cpu_jump(int cpu)
  35 {
  36         cpu = cpu_logical_map(cpu);
  37         if (!cpu || !ctrl_base)
  38                 return 0;
  39         return readl_relaxed(ctrl_base + ((cpu - 1) << 2));
  40 }
  41
  42 static void __init hisi_enable_scu_a9(void)
  43 {
  44         unsigned long base = 0;
  45         void __iomem *scu_base = NULL;
  46
  47         if (scu_a9_has_base()) {
  48                 base = scu_a9_get_base();
  49                 scu_base = ioremap(base, SZ_4K);
  50                 if (!scu_base) {
  51                         pr_err("ioremap(scu_base) failed\n");
  52                         return;
  53                 }
  54                 scu_enable(scu_base);
  55                 iounmap(scu_base);
  56         }
  57 }
  58
  59 static void __init hi3xxx_smp_prepare_cpus(unsigned int max_cpus)
  60 {
  61         struct device_node *np = NULL;
  62         u32 offset = 0;
  63
  64         hisi_enable_scu_a9();
  65         if (!ctrl_base) {
  66                 np = of_find_compatible_node(NULL, NULL, "hisilicon,sysctrl");
  67                 if (!np) {
  68                         pr_err("failed to find hisilicon,sysctrl node\n");
  69                         return;
  70                 }
  71                 ctrl_base = of_iomap(np, 0);
  72                 if (!ctrl_base) {
  73                         pr_err("failed to map address\n");
  74                         return;
  75                 }
  76                 if (of_property_read_u32(np, "smp-offset", &offset) < 0) {
  77                         pr_err("failed to find smp-offset property\n");
  78                         return;
  79                 }
  80                 ctrl_base += offset;
  81         }
  82 }
  83
  84 static int hi3xxx_boot_secondary(unsigned int cpu, struct task_struct *idle)
  85 {
  86         hi3xxx_set_cpu(cpu, true);
  87         hi3xxx_set_cpu_jump(cpu, secondary_startup);
  88         arch_send_wakeup_ipi_mask(cpumask_of(cpu));
  89         return 0;
  90 }
  91
  92 static const struct smp_operations hi3xxx_smp_ops __initconst = {
  93         .smp_prepare_cpus       = hi3xxx_smp_prepare_cpus,
  94         .smp_boot_secondary     = hi3xxx_boot_secondary,
  95 #ifdef CONFIG_HOTPLUG_CPU
  96         .cpu_die                = hi3xxx_cpu_die,
  97         .cpu_kill               = hi3xxx_cpu_kill,
  98 #endif
  99 };
 100
 101 static void __init hisi_common_smp_prepare_cpus(unsigned int max_cpus)
 102 {
 103         hisi_enable_scu_a9();
 104 }
 105
 106 static void hix5hd2_set_scu_boot_addr(phys_addr_t start_addr, phys_addr_t jump_addr)
 107 {
 108         void __iomem *virt;
 109
 110         virt = ioremap(start_addr, PAGE_SIZE);
 111
 112         writel_relaxed(0xe51ff004, virt);       /* ldr pc, [pc, #-4] */
 113         writel_relaxed(jump_addr, virt + 4);    /* pc jump phy address */
 114         iounmap(virt);
 115 }
 116
 117 static int hix5hd2_boot_secondary(unsigned int cpu, struct task_struct *idle)
 118 {
 119         phys_addr_t jumpaddr;
 120
 121         jumpaddr = __pa_symbol(secondary_startup);
 122         hix5hd2_set_scu_boot_addr(HIX5HD2_BOOT_ADDRESS, jumpaddr);
 123         hix5hd2_set_cpu(cpu, true);
 124         arch_send_wakeup_ipi_mask(cpumask_of(cpu));
 125         return 0;
 126 }
 127
 128
 129 static const struct smp_operations hix5hd2_smp_ops __initconst = {
 130         .smp_prepare_cpus       = hisi_common_smp_prepare_cpus,
 131         .smp_boot_secondary     = hix5hd2_boot_secondary,
 132 #ifdef CONFIG_HOTPLUG_CPU
 133         .cpu_die                = hix5hd2_cpu_die,
 134 #endif
 135 };
 136
 137
 138 #define SC_SCTL_REMAP_CLR      0x00000100
 139 #define HIP01_BOOT_ADDRESS     0x80000000
 140 #define REG_SC_CTRL            0x000
 141
 142 static void hip01_set_boot_addr(phys_addr_t start_addr, phys_addr_t jump_addr)
 143 {
 144         void __iomem *virt;
 145
 146         virt = phys_to_virt(start_addr);
 147
 148         writel_relaxed(0xe51ff004, virt);
 149         writel_relaxed(jump_addr, virt + 4);
 150 }
 151
 152 static int hip01_boot_secondary(unsigned int cpu, struct task_struct *idle)
 153 {
 154         phys_addr_t jumpaddr;
 155         unsigned int remap_reg_value = 0;
 156         struct device_node *node;
 157
 158
 159         jumpaddr = __pa_symbol(secondary_startup);
 160         hip01_set_boot_addr(HIP01_BOOT_ADDRESS, jumpaddr);
 161
 162         node = of_find_compatible_node(NULL, NULL, "hisilicon,hip01-sysctrl");
 163         if (WARN_ON(!node))
 164                 return -1;
 165         ctrl_base = of_iomap(node, 0);
 166
 167         /* set the secondary core boot from DDR */
 168         remap_reg_value = readl_relaxed(ctrl_base + REG_SC_CTRL);
 169         barrier();
 170         remap_reg_value |= SC_SCTL_REMAP_CLR;
 171         barrier();
 172         writel_relaxed(remap_reg_value, ctrl_base + REG_SC_CTRL);
 173
 174         hip01_set_cpu(cpu, true);
 175
 176         return 0;
 177 }
 178
 179 static const struct smp_operations hip01_smp_ops __initconst = {
 180         .smp_prepare_cpus       = hisi_common_smp_prepare_cpus,
 181         .smp_boot_secondary     = hip01_boot_secondary,
 182 };
 183
 184 CPU_METHOD_OF_DECLARE(hi3xxx_smp, "hisilicon,hi3620-smp", &hi3xxx_smp_ops);
 185 CPU_METHOD_OF_DECLARE(hix5hd2_smp, "hisilicon,hix5hd2-smp", &hix5hd2_smp_ops);
 186 CPU_METHOD_OF_DECLARE(hip01_smp, "hisilicon,hip01-smp", &hip01_smp_ops);