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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2017 Free Electrons
* Copyright (C) 2017 NextThing Co
*
* Author: Boris Brezillon <boris.brezillon@free-electrons.com>
*
* 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.
*/
#include <dm/device_compat.h>
#include <linux/mtd/rawnand.h>
#define ONFI_FEATURE_ADDR_30LFXG18AC_OTP 0x90
#define MACRONIX_30LFXG18AC_OTP_START_PAGE 2
#define MACRONIX_30LFXG18AC_OTP_PAGES 30
#define MACRONIX_30LFXG18AC_OTP_PAGE_SIZE 2112
#define MACRONIX_30LFXG18AC_OTP_SIZE_BYTES \
(MACRONIX_30LFXG18AC_OTP_PAGES * \
MACRONIX_30LFXG18AC_OTP_PAGE_SIZE)
#define MACRONIX_30LFXG18AC_OTP_EN BIT(0)
static int macronix_30lfxg18ac_get_otp_info(struct mtd_info *mtd, size_t len,
size_t *retlen,
struct otp_info *buf)
{
if (len < sizeof(*buf))
return -EINVAL;
/* Always report that OTP is unlocked. Reason is that this
* type of flash chip doesn't provide way to check that OTP
* is locked or not: subfeature parameter is implemented as
* volatile register. Technically OTP region could be locked
* and become readonly, but as there is no way to check it,
* don't allow to lock it ('_lock_user_prot_reg' callback
* always returns -EOPNOTSUPP) and thus we report that OTP
* is unlocked.
*/
buf->locked = 0;
buf->start = 0;
buf->length = MACRONIX_30LFXG18AC_OTP_SIZE_BYTES;
*retlen = sizeof(*buf);
return 0;
}
static int macronix_30lfxg18ac_otp_enable(struct nand_chip *nand)
{
u8 feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
struct mtd_info *mtd;
mtd = nand_to_mtd(nand);
feature_buf[0] = MACRONIX_30LFXG18AC_OTP_EN;
return nand->onfi_set_features(mtd, nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP, feature_buf);
}
static int macronix_30lfxg18ac_otp_disable(struct nand_chip *nand)
{
u8 feature_buf[ONFI_SUBFEATURE_PARAM_LEN] = { 0 };
struct mtd_info *mtd;
mtd = nand_to_mtd(nand);
return nand->onfi_set_features(mtd, nand, ONFI_FEATURE_ADDR_30LFXG18AC_OTP, feature_buf);
}
static int __macronix_30lfxg18ac_rw_otp(struct mtd_info *mtd,
loff_t offs_in_flash,
size_t len, size_t *retlen,
u_char *buf, bool write)
{
struct nand_chip *nand;
size_t bytes_handled;
off_t offs_in_page;
u64 page;
int ret;
nand = mtd_to_nand(mtd);
nand->select_chip(mtd, 0);
ret = macronix_30lfxg18ac_otp_enable(nand);
if (ret)
goto out_otp;
page = offs_in_flash;
/* 'page' will be result of division. */
offs_in_page = do_div(page, MACRONIX_30LFXG18AC_OTP_PAGE_SIZE);
bytes_handled = 0;
while (bytes_handled < len &&
page < MACRONIX_30LFXG18AC_OTP_PAGES) {
size_t bytes_to_handle;
u64 phys_page = page + MACRONIX_30LFXG18AC_OTP_START_PAGE;
bytes_to_handle = min_t(size_t, len - bytes_handled,
MACRONIX_30LFXG18AC_OTP_PAGE_SIZE -
offs_in_page);
if (write)
ret = nand_prog_page_op(nand, phys_page, offs_in_page,
&buf[bytes_handled], bytes_to_handle);
else
ret = nand_read_page_op(nand, phys_page, offs_in_page,
&buf[bytes_handled], bytes_to_handle);
if (ret)
goto out_otp;
bytes_handled += bytes_to_handle;
offs_in_page = 0;
page++;
}
*retlen = bytes_handled;
out_otp:
if (ret)
dev_err(mtd->dev, "failed to perform OTP IO: %i\n", ret);
ret = macronix_30lfxg18ac_otp_disable(nand);
if (ret)
dev_err(mtd->dev, "failed to leave OTP mode after %s\n",
write ? "write" : "read");
nand->select_chip(mtd, -1);
return ret;
}
static int macronix_30lfxg18ac_write_otp(struct mtd_info *mtd, loff_t to,
size_t len, size_t *rlen,
u_char *buf)
{
return __macronix_30lfxg18ac_rw_otp(mtd, to, len, rlen, (u_char *)buf,
true);
}
static int macronix_30lfxg18ac_read_otp(struct mtd_info *mtd, loff_t from,
size_t len, size_t *rlen,
u_char *buf)
{
return __macronix_30lfxg18ac_rw_otp(mtd, from, len, rlen, buf, false);
}
static int macronix_30lfxg18ac_lock_otp(struct mtd_info *mtd, loff_t from,
size_t len)
{
/* See comment in 'macronix_30lfxg18ac_get_otp_info()'. */
return -EOPNOTSUPP;
}
static void macronix_nand_setup_otp(struct nand_chip *chip)
{
static const char * const supported_otp_models[] = {
"MX30LF1G18AC",
"MX30LF2G18AC",
"MX30LF4G18AC",
};
int i;
if (!chip->onfi_version ||
!(le16_to_cpu(chip->onfi_params.opt_cmd)
& ONFI_OPT_CMD_SET_GET_FEATURES))
return;
for (i = 0; i < ARRAY_SIZE(supported_otp_models); i++) {
if (!strcmp(chip->onfi_params.model, supported_otp_models[i])) {
struct mtd_info *mtd;
mtd = nand_to_mtd(chip);
mtd->_get_user_prot_info = macronix_30lfxg18ac_get_otp_info;
mtd->_read_user_prot_reg = macronix_30lfxg18ac_read_otp;
mtd->_write_user_prot_reg = macronix_30lfxg18ac_write_otp;
mtd->_lock_user_prot_reg = macronix_30lfxg18ac_lock_otp;
return;
}
}
}
static int macronix_nand_init(struct nand_chip *chip)
{
if (nand_is_slc(chip))
chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
macronix_nand_setup_otp(chip);
return 0;
}
const struct nand_manufacturer_ops macronix_nand_manuf_ops = {
.init = macronix_nand_init,
};
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