linux/drivers/mtd/maps/physmap-bt1-rom.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2020 BAIKAL ELECTRONICS, JSC
 *
 * Authors:
 *   Serge Semin <[email protected]>
 *
 * Baikal-T1 Physically Mapped Internal ROM driver
 */
#include <linux/bits.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/mtd/map.h>
#include <linux/mtd/xip.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/types.h>

#include "physmap-bt1-rom.h"

/*
 * Baikal-T1 SoC ROMs are only accessible by the dword-aligned instructions.
 * We have to take this into account when implementing the data read-methods.
 * Note there is no need in bothering with endianness, since both Baikal-T1
 * CPU and MMIO are LE.
 */
static map_word __xipram bt1_rom_map_read(struct map_info *map,
					  unsigned long ofs)
{ … }

static void __xipram bt1_rom_map_copy_from(struct map_info *map,
					   void *to, unsigned long from,
					   ssize_t len)
{ … }

int of_flash_probe_bt1_rom(struct platform_device *pdev,
			   struct device_node *np,
			   struct map_info *map)
{ … }