cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ofpart_bcm4908.c (1339B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2021 Rafał Miłecki <rafal@milecki.pl>
      4 */
      5
      6#include <linux/module.h>
      7#include <linux/init.h>
      8#include <linux/of.h>
      9#include <linux/mtd/mtd.h>
     10#include <linux/slab.h>
     11#include <linux/mtd/partitions.h>
     12
     13#include "ofpart_bcm4908.h"
     14
     15#define BLPARAMS_FW_OFFSET		"NAND_RFS_OFS"
     16
     17static long long bcm4908_partitions_fw_offset(void)
     18{
     19	struct device_node *root;
     20	struct property *prop;
     21	const char *s;
     22
     23	root = of_find_node_by_path("/");
     24	if (!root)
     25		return -ENOENT;
     26
     27	of_property_for_each_string(root, "brcm_blparms", prop, s) {
     28		size_t len = strlen(BLPARAMS_FW_OFFSET);
     29		unsigned long offset;
     30		int err;
     31
     32		if (strncmp(s, BLPARAMS_FW_OFFSET, len) || s[len] != '=')
     33			continue;
     34
     35		err = kstrtoul(s + len + 1, 0, &offset);
     36		if (err) {
     37			pr_err("failed to parse %s\n", s + len + 1);
     38			return err;
     39		}
     40
     41		return offset << 10;
     42	}
     43
     44	return -ENOENT;
     45}
     46
     47int bcm4908_partitions_post_parse(struct mtd_info *mtd, struct mtd_partition *parts, int nr_parts)
     48{
     49	long long fw_offset;
     50	int i;
     51
     52	fw_offset = bcm4908_partitions_fw_offset();
     53
     54	for (i = 0; i < nr_parts; i++) {
     55		if (of_device_is_compatible(parts[i].of_node, "brcm,bcm4908-firmware")) {
     56			if (fw_offset < 0 || parts[i].offset == fw_offset)
     57				parts[i].name = "firmware";
     58			else
     59				parts[i].name = "backup";
     60		}
     61	}
     62
     63	return 0;
     64}