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/*
* Copyright (c) 2013-2014, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/device.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/random.h>
#include <soc/tegra/fuse.h>
#include "fuse.h"
#define FUSE_BEGIN 0x100
/* Tegra30 and later */
#define FUSE_VENDOR_CODE 0x100
#define FUSE_FAB_CODE 0x104
#define FUSE_LOT_CODE_0 0x108
#define FUSE_LOT_CODE_1 0x10c
#define FUSE_WAFER_ID 0x110
#define FUSE_X_COORDINATE 0x114
#define FUSE_Y_COORDINATE 0x118
#define FUSE_HAS_REVISION_INFO BIT(0)
enum speedo_idx {
SPEEDO_TEGRA30 = 0,
SPEEDO_TEGRA114,
SPEEDO_TEGRA124,
};
struct tegra_fuse_info {
int size;
int spare_bit;
enum speedo_idx speedo_idx;
};
static void __iomem *fuse_base;
static struct clk *fuse_clk;
static struct tegra_fuse_info *fuse_info;
u32 tegra30_fuse_readl(const unsigned int offset)
{
u32 val;
/*
* early in the boot, the fuse clock will be enabled by
* tegra_init_fuse()
*/
if (fuse_clk)
clk_prepare_enable(fuse_clk);
val = readl_relaxed(fuse_base + FUSE_BEGIN + offset);
if (fuse_clk)
clk_disable_unprepare(fuse_clk);
return val;
}
static struct tegra_fuse_info tegra30_info = {
.size = 0x2a4,
.spare_bit = 0x144,
.speedo_idx = SPEEDO_TEGRA30,
};
static struct tegra_fuse_info tegra114_info = {
.size = 0x2a0,
.speedo_idx = SPEEDO_TEGRA114,
};
static struct tegra_fuse_info tegra124_info = {
.size = 0x300,
.speedo_idx = SPEEDO_TEGRA124,
};
static const struct of_device_id tegra30_fuse_of_match[] = {
{ .compatible = "nvidia,tegra30-efuse", .data = &tegra30_info },
{ .compatible = "nvidia,tegra114-efuse", .data = &tegra114_info },
{ .compatible = "nvidia,tegra124-efuse", .data = &tegra124_info },
{},
};
static int tegra30_fuse_probe(struct platform_device *pdev)
{
const struct of_device_id *of_dev_id;
of_dev_id = of_match_device(tegra30_fuse_of_match, &pdev->dev);
if (!of_dev_id)
return -ENODEV;
fuse_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(fuse_clk)) {
dev_err(&pdev->dev, "missing clock");
return PTR_ERR(fuse_clk);
}
platform_set_drvdata(pdev, NULL);
if (tegra_fuse_create_sysfs(&pdev->dev, fuse_info->size,
tegra30_fuse_readl))
return -ENODEV;
dev_dbg(&pdev->dev, "loaded\n");
return 0;
}
static struct platform_driver tegra30_fuse_driver = {
.probe = tegra30_fuse_probe,
.driver = {
.name = "tegra_fuse",
.owner = THIS_MODULE,
.of_match_table = tegra30_fuse_of_match,
}
};
static int __init tegra30_fuse_init(void)
{
return platform_driver_register(&tegra30_fuse_driver);
}
postcore_initcall(tegra30_fuse_init);
/* Early boot code. This code is called before the devices are created */
typedef void (*speedo_f)(struct tegra_sku_info *sku_info);
static speedo_f __initdata speedo_tbl[] = {
[SPEEDO_TEGRA30] = tegra30_init_speedo_data,
[SPEEDO_TEGRA114] = tegra114_init_speedo_data,
[SPEEDO_TEGRA124] = tegra124_init_speedo_data,
};
static void __init tegra30_fuse_add_randomness(void)
{
u32 randomness[12];
randomness[0] = tegra_sku_info.sku_id;
randomness[1] = tegra_read_straps();
randomness[2] = tegra_read_chipid();
randomness[3] = tegra_sku_info.cpu_process_id << 16;
randomness[3] |= tegra_sku_info.core_process_id;
randomness[4] = tegra_sku_info.cpu_speedo_id << 16;
randomness[4] |= tegra_sku_info.soc_speedo_id;
randomness[5] = tegra30_fuse_readl(FUSE_VENDOR_CODE);
randomness[6] = tegra30_fuse_readl(FUSE_FAB_CODE);
randomness[7] = tegra30_fuse_readl(FUSE_LOT_CODE_0);
randomness[8] = tegra30_fuse_readl(FUSE_LOT_CODE_1);
randomness[9] = tegra30_fuse_readl(FUSE_WAFER_ID);
randomness[10] = tegra30_fuse_readl(FUSE_X_COORDINATE);
randomness[11] = tegra30_fuse_readl(FUSE_Y_COORDINATE);
add_device_randomness(randomness, sizeof(randomness));
}
static void __init legacy_fuse_init(void)
{
switch (tegra_get_chip_id()) {
case TEGRA30:
fuse_info = &tegra30_info;
break;
case TEGRA114:
fuse_info = &tegra114_info;
break;
case TEGRA124:
fuse_info = &tegra124_info;
break;
default:
return;
}
fuse_base = ioremap(TEGRA_FUSE_BASE, TEGRA_FUSE_SIZE);
}
bool __init tegra30_spare_fuse(int spare_bit)
{
u32 offset = fuse_info->spare_bit + spare_bit * 4;
return tegra30_fuse_readl(offset) & 1;
}
void __init tegra30_init_fuse_early(void)
{
struct device_node *np;
const struct of_device_id *of_match;
np = of_find_matching_node_and_match(NULL, tegra30_fuse_of_match,
&of_match);
if (np) {
fuse_base = of_iomap(np, 0);
fuse_info = (struct tegra_fuse_info *)of_match->data;
} else
legacy_fuse_init();
if (!fuse_base) {
pr_warn("fuse DT node missing and unknown chip id: 0x%02x\n",
tegra_get_chip_id());
return;
}
tegra_init_revision();
speedo_tbl[fuse_info->speedo_idx](&tegra_sku_info);
tegra30_fuse_add_randomness();
}
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