smp-sh73a0.c 1.4 KB

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  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. #include <asm/smp_plat.h>
  14. #include "common.h"
  15. #include "sh73a0.h"
  16. #define WUPCR IOMEM(0xe6151010)
  17. #define SRESCR IOMEM(0xe6151018)
  18. #define PSTR IOMEM(0xe6151040)
  19. #define SBAR IOMEM(0xe6180020)
  20. #define APARMBAREA IOMEM(0xe6f10020)
  21. #define SH73A0_SCU_BASE 0xf0000000
  22. static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle)
  23. {
  24. unsigned int lcpu = cpu_logical_map(cpu);
  25. if (((__raw_readl(PSTR) >> (4 * lcpu)) & 3) == 3)
  26. __raw_writel(1 << lcpu, WUPCR); /* wake up */
  27. else
  28. __raw_writel(1 << lcpu, SRESCR); /* reset */
  29. return 0;
  30. }
  31. static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus)
  32. {
  33. /* Map the reset vector (in headsmp.S) */
  34. __raw_writel(0, APARMBAREA); /* 4k */
  35. __raw_writel(__pa(shmobile_boot_vector), SBAR);
  36. /* setup sh73a0 specific SCU bits */
  37. shmobile_smp_scu_prepare_cpus(SH73A0_SCU_BASE, max_cpus);
  38. }
  39. const struct smp_operations sh73a0_smp_ops __initconst = {
  40. .smp_prepare_cpus = sh73a0_smp_prepare_cpus,
  41. .smp_boot_secondary = sh73a0_boot_secondary,
  42. #ifdef CONFIG_HOTPLUG_CPU
  43. .cpu_can_disable = shmobile_smp_cpu_can_disable,
  44. .cpu_die = shmobile_smp_scu_cpu_die,
  45. .cpu_kill = shmobile_smp_scu_cpu_kill,
  46. #endif
  47. };