arch/arm/mach-shmobile/smp-sh73a0.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * SMP support for R-Mobile / SH-Mobile - sh73a0 portion
   4  *
   5  * Copyright (C) 2010  Magnus Damm
   6  * Copyright (C) 2010  Takashi Yoshii
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/smp.h>
  11 #include <linux/io.h>
  12 #include <linux/delay.h>
  13
  14 #include <asm/smp_plat.h>
  15
  16 #include "common.h"
  17 #include "sh73a0.h"
  18
  19 #define CPG_BASE2       0xe6151000
  20 #define WUPCR           0x10    /* System-CPU Wake Up Control Register */
  21 #define SRESCR          0x18    /* System-CPU Software Reset Control Register */
  22 #define PSTR            0x40    /* System-CPU Power Status Register */
  23
  24 #define SYSC_BASE       0xe6180000
  25 #define SBAR            0x20    /* SYS Boot Address Register */
  26
  27 #define AP_BASE         0xe6f10000
  28 #define APARMBAREA      0x20    /* Address Translation Area Register */
  29
  30 #define SH73A0_SCU_BASE 0xf0000000
  31
  32 static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
  33 {
  34         unsigned int lcpu = cpu_logical_map(cpu);
  35         void __iomem *cpg2 = ioremap(CPG_BASE2, PAGE_SIZE);
  36
  37         if (((readl(cpg2 + PSTR) >> (4 * lcpu)) & 3) == 3)
  38                 writel(1 << lcpu, cpg2 + WUPCR);        /* wake up */
  39         else
  40                 writel(1 << lcpu, cpg2 + SRESCR);       /* reset */
  41         iounmap(cpg2);
  42         return 0;
  43 }
  44
  45 static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
  46 {
  47         void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE);
  48         void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE);
  49
  50         /* Map the reset vector (in headsmp.S) */
  51         writel(0, ap + APARMBAREA);      /* 4k */
  52         writel(__pa(shmobile_boot_vector), sysc + SBAR);
  53         iounmap(sysc);
  54         iounmap(ap);
  55
  56         /* setup sh73a0 specific SCU bits */
  57         shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
  58 }
  59
  60 const struct smp_operations sh73a0_smp_ops __initconst = {
  61         .smp_prepare_cpus       = sh73a0_smp_prepare_cpus,
  62         .smp_boot_secondary     = sh73a0_boot_secondary,
  63 #ifdef CONFIG_HOTPLUG_CPU
  64         .cpu_can_disable        = shmobile_smp_cpu_can_disable,
  65         .cpu_die                = shmobile_smp_scu_cpu_die,
  66         .cpu_kill               = shmobile_smp_scu_cpu_kill,
  67 #endif
  68 };