104 lines
2.1 KiB
C
104 lines
2.1 KiB
C
/*
|
|
* Copyright (C) 2014 Marvell
|
|
*
|
|
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "mvebu-cpureset: " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/io.h>
|
|
#include <linux/resource.h>
|
|
#include "armada-370-xp.h"
|
|
|
|
static void __iomem *cpu_reset_base;
|
|
static size_t cpu_reset_size;
|
|
|
|
#define CPU_RESET_OFFSET(cpu) (cpu * 0x8)
|
|
#define CPU_RESET_ASSERT BIT(0)
|
|
|
|
int mvebu_cpu_reset_deassert(int cpu)
|
|
{
|
|
u32 reg;
|
|
|
|
if (!cpu_reset_base)
|
|
return -ENODEV;
|
|
|
|
if (CPU_RESET_OFFSET(cpu) >= cpu_reset_size)
|
|
return -EINVAL;
|
|
|
|
reg = readl(cpu_reset_base + CPU_RESET_OFFSET(cpu));
|
|
reg &= ~CPU_RESET_ASSERT;
|
|
writel(reg, cpu_reset_base + CPU_RESET_OFFSET(cpu));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mvebu_cpu_reset_map(struct device_node *np, int res_idx)
|
|
{
|
|
struct resource res;
|
|
|
|
if (of_address_to_resource(np, res_idx, &res)) {
|
|
pr_err("unable to get resource\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (!request_mem_region(res.start, resource_size(&res),
|
|
np->full_name)) {
|
|
pr_err("unable to request region\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
cpu_reset_base = ioremap(res.start, resource_size(&res));
|
|
if (!cpu_reset_base) {
|
|
pr_err("unable to map registers\n");
|
|
release_mem_region(res.start, resource_size(&res));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
cpu_reset_size = resource_size(&res);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init mvebu_cpu_reset_init(void)
|
|
{
|
|
struct device_node *np;
|
|
int res_idx;
|
|
int ret;
|
|
|
|
np = of_find_compatible_node(NULL, NULL,
|
|
"marvell,armada-370-cpu-reset");
|
|
if (np) {
|
|
res_idx = 0;
|
|
} else {
|
|
/*
|
|
* This code is kept for backward compatibility with
|
|
* old Device Trees.
|
|
*/
|
|
np = of_find_compatible_node(NULL, NULL,
|
|
"marvell,armada-370-xp-pmsu");
|
|
if (np) {
|
|
pr_warn(FW_WARN "deprecated pmsu binding\n");
|
|
res_idx = 1;
|
|
}
|
|
}
|
|
|
|
/* No reset node found */
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
ret = mvebu_cpu_reset_map(np, res_idx);
|
|
of_node_put(np);
|
|
|
|
return ret;
|
|
}
|
|
|
|
early_initcall(mvebu_cpu_reset_init);
|