105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
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/*
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* Copyright (c) 2016, Harman Becker. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/string.h>
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#include <linux/io.h>
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#include "tegra_bootloader_debug.h"
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static void *tegra_bl_mapped_boot_cfg_start;
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static ssize_t bcp_data_read(struct file *filp, struct kobject *kobj,
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struct bin_attribute *bin_attr,
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char *buf, loff_t off, size_t count)
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{
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uint8_t *data = (uint8_t *) tegra_bl_mapped_boot_cfg_start;
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/* read from the reserved memory */
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memcpy(buf, data + off, count);
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return count;
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}
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static struct bin_attribute bcp_attr_data = {
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.attr = {
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.name = "boot_cfg",
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.mode = 0444,
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},
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.size = 0,
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.read = bcp_data_read,
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.write = NULL,
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};
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static __init int bcp_init(void)
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{
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int ret = 0;
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void __iomem *ptr_bl_boot_cfg_start = NULL;
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tegra_bl_mapped_boot_cfg_start = NULL;
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/* If the following variables are not set then we don't have BCP data */
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if (!tegra_bl_bcp_size || !tegra_bl_bcp_start)
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return -ENXIO;
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tegra_bl_mapped_boot_cfg_start = phys_to_virt(tegra_bl_bcp_start);
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if (!pfn_valid(__phys_to_pfn(tegra_bl_bcp_start))) {
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ptr_bl_boot_cfg_start =
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ioremap(tegra_bl_bcp_start, tegra_bl_bcp_size);
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WARN_ON(!ptr_bl_boot_cfg_start);
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if (!ptr_bl_boot_cfg_start) {
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pr_error("%s: Failed to map tegra_bl_prof_start %08x\n",
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__func__, (unsigned int)tegra_bl_bcp_start);
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ret = -ENXIO;
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goto out_err;
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}
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tegra_bl_mapped_boot_cfg_start = ptr_bl_boot_cfg_start;
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}
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bcp_attr_data.size = tegra_bl_bcp_size;
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ret = sysfs_create_bin_file(kernel_kobj, &bcp_attr_data);
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if (ret) {
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pr_error("%s: sysfs_create_bin_file failed\n",
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__func__);
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goto out_err;
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}
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return ret;
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out_err:
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if (ptr_bl_boot_cfg_start)
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iounmap(ptr_bl_boot_cfg_start);
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return ret;
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}
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static void __exit bcp_exit(void)
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{
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if (tegra_bl_mapped_boot_cfg_start)
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iounmap(tegra_bl_mapped_boot_cfg_start);
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sysfs_remove_bin_file(kernel_kobj, &bcp_attr_data);
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}
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module_init(bcp_init);
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module_exit(bcp_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Driver to expose BCP data to user space");
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MODULE_AUTHOR("Lukasz Taborowski <lukasz.taborowski@harman.com>");
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