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/*
* Xilinx EFUSE driver
*
* Copyright (c) 2016 Xilinx Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/io.h>
#include <linux/of_address.h>
#include "common.h"
#define EFUSE_STATUS_OFFSET 0x10
/* 0 means cpu1 is working, 1 means cpu1 is broken */
#define EFUSE_STATUS_CPU_BIT BIT(7)
void __iomem *zynq_efuse_base;
/**
* zynq_efuse_cpu_state - Read/write cpu state
* @cpu: cpu number
*
* Return: true if cpu is running, false if cpu is broken
*/
bool zynq_efuse_cpu_state(int cpu)
{
u32 state;
if (!cpu)
return true;
state = readl(zynq_efuse_base + EFUSE_STATUS_OFFSET);
state &= EFUSE_STATUS_CPU_BIT;
if (!state)
return true;
return false;
}
/**
* zynq_early_efuse_init - Early efuse init function
*
* Return: 0 on success, negative errno otherwise.
*
* Called very early during boot from platform code.
*/
int __init zynq_early_efuse_init(void)
{
struct device_node *np;
np = of_find_compatible_node(NULL, NULL, "xlnx,zynq-efuse");
if (!np) {
pr_err("%s: no efuse node found\n", __func__);
BUG();
}
zynq_efuse_base = of_iomap(np, 0);
if (!zynq_efuse_base) {
pr_err("%s: Unable to map I/O memory\n", __func__);
BUG();
}
np->data = (__force void *)zynq_efuse_base;
pr_info("%s mapped to %p\n", np->name, zynq_efuse_base);
of_node_put(np);
return 0;
}
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