arch/arm/mach-uniphier/arm64/smp_kick_cpus.c

   1 /*
   2  * Copyright (C) 2016 Masahiro Yamada <yamada.masahiro@socionext.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <mapmem.h>
   9 #include <linux/io.h>
  10 #include <linux/sizes.h>
  11
  12 #define UNIPHIER_SMPCTRL_ROM_RSV0       0x59801200
  13
  14 void uniphier_smp_setup(void);
  15 void uniphier_secondary_startup(void);
  16
  17 void uniphier_smp_kick_all_cpus(void)
  18 {
  19         void __iomem *rom_boot_rsv0;
  20
  21         rom_boot_rsv0 = map_sysmem(UNIPHIER_SMPCTRL_ROM_RSV0, SZ_8);
  22
  23         writeq((u64)uniphier_secondary_startup, rom_boot_rsv0);
  24
  25         unmap_sysmem(rom_boot_rsv0);
  26
  27         uniphier_smp_setup();
  28
  29         asm("dsb        ishst\n" /* Ensure the write to ROM_RSV0 is visible */
  30             "sev"); /* Bring up all secondary CPUs from Boot ROM into U-Boot */
  31 }