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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winbond.c (3526B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (c) 2017 exceet electronics GmbH
      4 *
      5 * Authors:
      6 *	Frieder Schrempf <frieder.schrempf@exceet.de>
      7 *	Boris Brezillon <boris.brezillon@bootlin.com>
      8 */
      9
     10#include <linux/device.h>
     11#include <linux/kernel.h>
     12#include <linux/mtd/spinand.h>
     13
     14#define SPINAND_MFR_WINBOND		0xEF
     15
     16#define WINBOND_CFG_BUF_READ		BIT(3)
     17
     18static SPINAND_OP_VARIANTS(read_cache_variants,
     19		SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 2, NULL, 0),
     20		SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
     21		SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
     22		SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
     23		SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
     24		SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
     25
     26static SPINAND_OP_VARIANTS(write_cache_variants,
     27		SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
     28		SPINAND_PROG_LOAD(true, 0, NULL, 0));
     29
     30static SPINAND_OP_VARIANTS(update_cache_variants,
     31		SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
     32		SPINAND_PROG_LOAD(false, 0, NULL, 0));
     33
     34static int w25m02gv_ooblayout_ecc(struct mtd_info *mtd, int section,
     35				  struct mtd_oob_region *region)
     36{
     37	if (section > 3)
     38		return -ERANGE;
     39
     40	region->offset = (16 * section) + 8;
     41	region->length = 8;
     42
     43	return 0;
     44}
     45
     46static int w25m02gv_ooblayout_free(struct mtd_info *mtd, int section,
     47				   struct mtd_oob_region *region)
     48{
     49	if (section > 3)
     50		return -ERANGE;
     51
     52	region->offset = (16 * section) + 2;
     53	region->length = 6;
     54
     55	return 0;
     56}
     57
     58static const struct mtd_ooblayout_ops w25m02gv_ooblayout = {
     59	.ecc = w25m02gv_ooblayout_ecc,
     60	.free = w25m02gv_ooblayout_free,
     61};
     62
     63static int w25m02gv_select_target(struct spinand_device *spinand,
     64				  unsigned int target)
     65{
     66	struct spi_mem_op op = SPI_MEM_OP(SPI_MEM_OP_CMD(0xc2, 1),
     67					  SPI_MEM_OP_NO_ADDR,
     68					  SPI_MEM_OP_NO_DUMMY,
     69					  SPI_MEM_OP_DATA_OUT(1,
     70							spinand->scratchbuf,
     71							1));
     72
     73	*spinand->scratchbuf = target;
     74	return spi_mem_exec_op(spinand->spimem, &op);
     75}
     76
     77static const struct spinand_info winbond_spinand_table[] = {
     78	SPINAND_INFO("W25M02GV",
     79		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xab),
     80		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 2),
     81		     NAND_ECCREQ(1, 512),
     82		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
     83					      &write_cache_variants,
     84					      &update_cache_variants),
     85		     0,
     86		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL),
     87		     SPINAND_SELECT_TARGET(w25m02gv_select_target)),
     88	SPINAND_INFO("W25N01GV",
     89		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0xaa),
     90		     NAND_MEMORG(1, 2048, 64, 64, 1024, 20, 1, 1, 1),
     91		     NAND_ECCREQ(1, 512),
     92		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
     93					      &write_cache_variants,
     94					      &update_cache_variants),
     95		     0,
     96		     SPINAND_ECCINFO(&w25m02gv_ooblayout, NULL)),
     97};
     98
     99static int winbond_spinand_init(struct spinand_device *spinand)
    100{
    101	struct nand_device *nand = spinand_to_nand(spinand);
    102	unsigned int i;
    103
    104	/*
    105	 * Make sure all dies are in buffer read mode and not continuous read
    106	 * mode.
    107	 */
    108	for (i = 0; i < nand->memorg.ntargets; i++) {
    109		spinand_select_target(spinand, i);
    110		spinand_upd_cfg(spinand, WINBOND_CFG_BUF_READ,
    111				WINBOND_CFG_BUF_READ);
    112	}
    113
    114	return 0;
    115}
    116
    117static const struct spinand_manufacturer_ops winbond_spinand_manuf_ops = {
    118	.init = winbond_spinand_init,
    119};
    120
    121const struct spinand_manufacturer winbond_spinand_manufacturer = {
    122	.id = SPINAND_MFR_WINBOND,
    123	.name = "Winbond",
    124	.chips = winbond_spinand_table,
    125	.nchips = ARRAY_SIZE(winbond_spinand_table),
    126	.ops = &winbond_spinand_manuf_ops,
    127};