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/*
* arch/arm/mach-tegra/nct.c
*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* 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.
*
* This program is distributed in the hope that 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/fcntl.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/crc32.h>
#include <linux/sysfs.h>
#include <mach/nct.h>
#include "board.h"
#define USE_CRC32_IN_NCT 1
static bool tegra_nct_initialized;
static struct nct_part_head_type nct_head;
static void __iomem *nct_ptr;
int tegra_nct_read_item(u32 index, union nct_item_type *buf)
{
struct nct_entry_type *entry = NULL;
u8 *nct;
#if USE_CRC32_IN_NCT
u32 crc = 0;
#endif
if (!tegra_nct_initialized)
return -EPERM;
entry = kmalloc(sizeof(struct nct_entry_type), GFP_KERNEL);
if (!entry) {
pr_err("%s: failed to allocate buffer\n", __func__);
return -ENOMEM;
}
nct = (u8 *)(nct_ptr + NCT_ENTRY_OFFSET +
(index * sizeof(*entry)));
memcpy((u8 *)entry, nct, sizeof(*entry));
/* check CRC integrity */
#if USE_CRC32_IN_NCT
/* last checksum field of entry is not included in CRC calculation */
crc = crc32_le(~0, (u8 *)entry, sizeof(*entry) -
sizeof(entry->checksum)) ^ ~0;
if (crc != entry->checksum) {
pr_err("%s: checksum err(0x%x/0x%x)\n", __func__,
crc, entry->checksum);
kfree(entry);
return -EINVAL;
}
#endif
/* check index integrity */
if (index != entry->index) {
pr_err("%s: index err(0x%x/0x%x)\n", __func__,
index, entry->index);
kfree(entry);
return -EINVAL;
}
memcpy(buf, &entry->data, sizeof(*buf));
kfree(entry);
return 0;
}
int tegra_nct_is_init(void)
{
return tegra_nct_initialized;
}
static int __init tegra_nct_init(void)
{
if (tegra_nct_initialized)
return 0;
if ((tegra_nck_start == 0) || (tegra_nck_size == 0)) {
pr_err("tegra_nct: not configured\n");
return -ENOTSUPP;
}
nct_ptr = ioremap_wc(tegra_nck_start,
tegra_nck_size);
if (!nct_ptr) {
pr_err("tegra_nct: failed to ioremap memory at 0x%08lx\n",
tegra_nck_start);
return -EIO;
}
memcpy(&nct_head, nct_ptr, sizeof(nct_head));
wmb();
pr_info("%s: magic(0x%x),vid(0x%x),pid(0x%x),ver(V%x.%x),rev(%d)\n",
__func__,
nct_head.magicId,
nct_head.vendorId,
nct_head.productId,
(nct_head.version >> 16) & 0xFFFF,
(nct_head.version & 0xFFFF),
nct_head.revision);
if (nct_head.magicId != NCT_MAGIC_ID) {
pr_err("%s: magic ID error (0x%x/0x%x)\n", __func__,
nct_head.magicId, NCT_MAGIC_ID);
iounmap(nct_ptr);
return -ENOKEY;
}
tegra_nct_initialized = true;
return 0;
}
early_initcall(tegra_nct_init);
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