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/*
* ocotp.c - i.MX6 ocotp fusebox driver
*
* Provide an interface for programming and sensing the information that are
* stored in on-chip fuse elements. This functionality is part of the IC
* Identification Module (IIM), which is present on some i.MX CPUs.
*
* Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>,
* Orex Computed Radiography
*
* 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.
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <common.h>
#include <driver.h>
#include <malloc.h>
#include <xfuncs.h>
#include <errno.h>
#include <init.h>
#include <net.h>
#include <io.h>
#include <of.h>
/*
* a single MAC address reference has the form
* <&phandle regoffset>
*/
#define MAC_ADDRESS_PROPLEN (2 * sizeof(__be32))
static void imx_ocotp_init_dt(struct device_d *dev, void __iomem *base)
{
char mac[6];
const __be32 *prop;
struct device_node *node = dev->device_node;
int len;
if (!node)
return;
prop = of_get_property(node, "barebox,provide-mac-address", &len);
if (!prop)
return;
while (len >= MAC_ADDRESS_PROPLEN) {
struct device_node *rnode;
uint32_t phandle, offset, value;
phandle = be32_to_cpup(prop++);
rnode = of_find_node_by_phandle(phandle);
offset = be32_to_cpup(prop++);
value = readl(base + offset + 0x10);
mac[0] = (value >> 8);
mac[1] = value;
value = readl(base + offset);
mac[2] = value >> 24;
mac[3] = value >> 16;
mac[4] = value >> 8;
mac[5] = value;
of_eth_register_ethaddr(rnode, mac);
len -= MAC_ADDRESS_PROPLEN;
}
}
static int imx_ocotp_probe(struct device_d *dev)
{
void __iomem *base;
base = dev_request_mem_region(dev, 0);
if (!base)
return -EBUSY;
imx_ocotp_init_dt(dev, base);
return 0;
}
static __maybe_unused struct of_device_id imx_ocotp_dt_ids[] = {
{
.compatible = "fsl,imx6q-ocotp",
}, {
/* sentinel */
}
};
static struct driver_d imx_ocotp_driver = {
.name = "imx_ocotp",
.probe = imx_ocotp_probe,
.of_compatible = DRV_OF_COMPAT(imx_ocotp_dt_ids),
};
static int imx_ocotp_init(void)
{
platform_driver_register(&imx_ocotp_driver);
return 0;
}
coredevice_initcall(imx_ocotp_init);
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