1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Copyright 2010-2011 Calxeda, Inc.
  4 * Copyright 2012 Pavel Machek <pavel@denx.de>
  5 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
  6 * Copyright (C) 2012 Altera Corporation
  7 */
  8#include <linux/delay.h>
  9#include <linux/init.h>
 10#include <linux/smp.h>
 11#include <linux/io.h>
 12#include <linux/of.h>
 13#include <linux/of_address.h>
 14
 15#include <asm/cacheflush.h>
 16#include <asm/smp_scu.h>
 17#include <asm/smp_plat.h>
 18
 19#include "core.h"
 20
 21static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
 22{
 23	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
 24
 25	if (socfpga_cpu1start_addr) {
 26		/* This will put CPU #1 into reset. */
 27		writel(RSTMGR_MPUMODRST_CPU1,
 28		       rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
 29
 30		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
 31
 32		writel(__pa_symbol(secondary_startup),
 33		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
 34
 35		flush_cache_all();
 36		smp_wmb();
 37		outer_clean_range(0, trampoline_size);
 38
 39		/* This will release CPU #1 out of reset. */
 40		writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
 41	}
 42
 43	return 0;
 44}
 45
 46static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
 47{
 48	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
 49
 50	if (socfpga_cpu1start_addr) {
 51		writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
 52		       SOCFPGA_A10_RSTMGR_MODMPURST);
 53		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
 54
 55		writel(__pa_symbol(secondary_startup),
 56		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
 57
 58		flush_cache_all();
 59		smp_wmb();
 60		outer_clean_range(0, trampoline_size);
 61
 62		/* This will release CPU #1 out of reset. */
 63		writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
 64	}
 65
 66	return 0;
 67}
 68
 69static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 70{
 71	struct device_node *np;
 72	void __iomem *socfpga_scu_base_addr;
 73
 74	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
 75	if (!np) {
 76		pr_err("%s: missing scu\n", __func__);
 77		return;
 78	}
 79
 80	socfpga_scu_base_addr = of_iomap(np, 0);
 81	if (!socfpga_scu_base_addr)
 82		return;
 83	scu_enable(socfpga_scu_base_addr);
 84}
 85
 86#ifdef CONFIG_HOTPLUG_CPU
 87/*
 88 * platform-specific code to shutdown a CPU
 89 *
 90 * Called with IRQs disabled
 91 */
 92static void socfpga_cpu_die(unsigned int cpu)
 93{
 94	/* Do WFI. If we wake up early, go back into WFI */
 95	while (1)
 96		cpu_do_idle();
 97}
 98
 99/*
100 * We need a dummy function so that platform_can_cpu_hotplug() knows
101 * we support CPU hotplug. However, the function does not need to do
102 * anything, because CPUs going offline just do WFI. We could reset
103 * the CPUs but it would increase power consumption.
104 */
105static int socfpga_cpu_kill(unsigned int cpu)
106{
107	return 1;
108}
109#endif
110
111static const struct smp_operations socfpga_smp_ops __initconst = {
112	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
113	.smp_boot_secondary	= socfpga_boot_secondary,
114#ifdef CONFIG_HOTPLUG_CPU
115	.cpu_die		= socfpga_cpu_die,
116	.cpu_kill		= socfpga_cpu_kill,
117#endif
118};
119
120static const struct smp_operations socfpga_a10_smp_ops __initconst = {
121	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
122	.smp_boot_secondary	= socfpga_a10_boot_secondary,
123#ifdef CONFIG_HOTPLUG_CPU
124	.cpu_die		= socfpga_cpu_die,
125	.cpu_kill		= socfpga_cpu_kill,
126#endif
127};
128
129CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
130CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);