mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-01 17:56:50 +07:00
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2014 Marvell Technology Group Ltd.
|
||
|
|
*
|
||
|
|
* Antoine Ténart <antoine.tenart@free-electrons.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License version 2 as
|
||
|
|
* published by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/of.h>
|
||
|
|
#include <linux/of_address.h>
|
||
|
|
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
#include <asm/smp_plat.h>
|
||
|
|
#include <asm/smp_scu.h>
|
||
|
|
|
||
|
|
#define CPU_RESET 0x00
|
||
|
|
|
||
|
|
#define RESET_VECT 0x00
|
||
|
|
#define SW_RESET_ADDR 0x94
|
||
|
|
|
||
|
|
extern void berlin_secondary_startup(void);
|
||
|
|
extern u32 boot_inst;
|
||
|
|
|
||
|
|
static void __iomem *cpu_ctrl;
|
||
|
|
|
||
|
|
static inline void berlin_perform_reset_cpu(unsigned int cpu)
|
||
|
|
{
|
||
|
|
u32 val;
|
||
|
|
|
||
|
|
val = readl(cpu_ctrl + CPU_RESET);
|
||
|
|
val |= BIT(cpu_logical_map(cpu));
|
||
|
|
writel(val, cpu_ctrl + CPU_RESET);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int berlin_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
||
|
|
{
|
||
|
|
if (!cpu_ctrl)
|
||
|
|
return -EFAULT;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Reset the CPU, making it to execute the instruction in the reset
|
||
|
|
* exception vector.
|
||
|
|
*/
|
||
|
|
berlin_perform_reset_cpu(cpu);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init berlin_smp_prepare_cpus(unsigned int max_cpus)
|
||
|
|
{
|
||
|
|
struct device_node *np;
|
||
|
|
void __iomem *scu_base;
|
||
|
|
void __iomem *vectors_base;
|
||
|
|
|
||
|
|
np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
|
||
|
|
scu_base = of_iomap(np, 0);
|
||
|
|
of_node_put(np);
|
||
|
|
if (!scu_base)
|
||
|
|
return;
|
||
|
|
|
||
|
|
np = of_find_compatible_node(NULL, NULL, "marvell,berlin-cpu-ctrl");
|
||
|
|
cpu_ctrl = of_iomap(np, 0);
|
||
|
|
of_node_put(np);
|
||
|
|
if (!cpu_ctrl)
|
||
|
|
goto unmap_scu;
|
||
|
|
|
||
|
|
vectors_base = ioremap(CONFIG_VECTORS_BASE, SZ_32K);
|
||
|
|
if (!vectors_base)
|
||
|
|
goto unmap_scu;
|
||
|
|
|
||
|
|
scu_enable(scu_base);
|
||
|
|
flush_cache_all();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Write the first instruction the CPU will execute after being reset
|
||
|
|
* in the reset exception vector.
|
||
|
|
*/
|
||
|
|
writel(boot_inst, vectors_base + RESET_VECT);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Write the secondary startup address into the SW reset address
|
||
|
|
* vector. This is used by boot_inst.
|
||
|
|
*/
|
||
|
|
writel(virt_to_phys(berlin_secondary_startup), vectors_base + SW_RESET_ADDR);
|
||
|
|
|
||
|
|
iounmap(vectors_base);
|
||
|
|
unmap_scu:
|
||
|
|
iounmap(scu_base);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct smp_operations berlin_smp_ops __initdata = {
|
||
|
|
.smp_prepare_cpus = berlin_smp_prepare_cpus,
|
||
|
|
.smp_boot_secondary = berlin_boot_secondary,
|
||
|
|
};
|
||
|
|
CPU_METHOD_OF_DECLARE(berlin_smp, "marvell,berlin-smp", &berlin_smp_ops);
|