cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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smp-r8a7779.c (1814B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
      4 *
      5 * Copyright (C) 2011  Renesas Solutions Corp.
      6 * Copyright (C) 2011  Magnus Damm
      7 */
      8#include <linux/kernel.h>
      9#include <linux/init.h>
     10#include <linux/smp.h>
     11#include <linux/spinlock.h>
     12#include <linux/io.h>
     13#include <linux/delay.h>
     14#include <linux/soc/renesas/rcar-sysc.h>
     15
     16#include <asm/cacheflush.h>
     17#include <asm/smp_plat.h>
     18#include <asm/smp_scu.h>
     19
     20#include "common.h"
     21#include "r8a7779.h"
     22
     23#define HPBREG_BASE		0xfe700000
     24#define AVECR			0x0040	/* ARM Reset Vector Address Register */
     25
     26#define R8A7779_SCU_BASE	0xf0000000
     27
     28static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
     29{
     30	int ret = -EIO;
     31
     32	cpu = cpu_logical_map(cpu);
     33	if (cpu)
     34		ret = rcar_sysc_power_up_cpu(cpu);
     35
     36	return ret;
     37}
     38
     39static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
     40{
     41	void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
     42
     43	/* Map the reset vector (in headsmp-scu.S, headsmp.S) */
     44	writel(__pa(shmobile_boot_vector), base + AVECR);
     45
     46	/* setup r8a7779 specific SCU bits */
     47	shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
     48
     49	iounmap(base);
     50}
     51
     52#ifdef CONFIG_HOTPLUG_CPU
     53static int r8a7779_platform_cpu_kill(unsigned int cpu)
     54{
     55	int ret = -EIO;
     56
     57	cpu = cpu_logical_map(cpu);
     58	if (cpu)
     59		ret = rcar_sysc_power_down_cpu(cpu);
     60
     61	return ret ? ret : 1;
     62}
     63
     64static int r8a7779_cpu_kill(unsigned int cpu)
     65{
     66	if (shmobile_smp_scu_cpu_kill(cpu))
     67		return r8a7779_platform_cpu_kill(cpu);
     68
     69	return 0;
     70}
     71#endif /* CONFIG_HOTPLUG_CPU */
     72
     73const struct smp_operations r8a7779_smp_ops  __initconst = {
     74	.smp_prepare_cpus	= r8a7779_smp_prepare_cpus,
     75	.smp_boot_secondary	= r8a7779_boot_secondary,
     76#ifdef CONFIG_HOTPLUG_CPU
     77	.cpu_die		= shmobile_smp_scu_cpu_die,
     78	.cpu_kill		= r8a7779_cpu_kill,
     79#endif
     80};