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/*
* Freescale GPMI NFC NAND Flash Driver
*
* Copyright (C) 2010 Freescale Semiconductor, Inc.
* Copyright (C) 2008 Embedded Alley Solutions, Inc.
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "gpmi-nfc.h"
/*
* Useful variables for Boot ROM Helper version 0.
*/
static const char *fingerprint = "STMP";
/**
* set_geometry() - Sets geometry for the Boot ROM Helper.
*
* @this: Per-device data.
*/
static int set_geometry(struct gpmi_nfc_data *this)
{
struct gpmi_nfc_platform_data *pdata = this->pdata;
struct physical_geometry *physical = &this->physical_geometry;
struct boot_rom_geometry *geometry = &this->rom_geometry;
int error;
/* Version-independent geometry. */
error = gpmi_nfc_rom_helper_set_geometry(this);
if (error)
return error;
/*
* Check if the platform data indicates we are to protect the boot area.
*/
if (!pdata->boot_area_size_in_bytes) {
geometry->boot_area_count = 0;
geometry->boot_area_size_in_bytes = 0;
return 0;
}
/*
* If control arrives here, we are supposed to set up partitions to
* protect the boot areas. In this version of the ROM, the number of
* boot areas and their size depends on the number of chips.
*/
if (physical->chip_count == 1) {
geometry->boot_area_count = 1;
geometry->boot_area_size_in_bytes =
pdata->boot_area_size_in_bytes * 2;
} else {
geometry->boot_area_count = 2;
geometry->boot_area_size_in_bytes =
pdata->boot_area_size_in_bytes;
}
/* Return success. */
return 0;
}
/**
* check_transcription_stamp() - Checks for a transcription stamp.
*
* Returns 0 if a stamp is not found.
*
* @this: Per-device data.
*/
static int check_transcription_stamp(struct gpmi_nfc_data *this)
{
struct physical_geometry *physical = &this->physical_geometry;
struct boot_rom_geometry *rom_geo = &this->rom_geometry;
struct mil *mil = &this->mil;
struct mtd_info *mtd = &mil->mtd;
struct nand_chip *nand = &mil->nand;
unsigned int search_area_size_in_strides;
unsigned int stride;
unsigned int page;
loff_t byte;
uint8_t *buffer = nand->buffers->databuf;
int saved_chip_number;
int found_an_ncb_fingerprint = false;
/* Compute the number of strides in a search area. */
search_area_size_in_strides = 1 << rom_geo->search_area_stride_exponent;
/* Select chip 0. */
saved_chip_number = mil->current_chip;
nand->select_chip(mtd, 0);
/*
* Loop through the first search area, looking for the NCB fingerprint.
*/
pr_info("Scanning for an NCB fingerprint...\n");
for (stride = 0; stride < search_area_size_in_strides; stride++) {
/* Compute the page and byte addresses. */
page = stride * rom_geo->stride_size_in_pages;
byte = page * physical->page_data_size_in_bytes;
pr_info(" Looking for a fingerprint in page 0x%x\n", page);
/*
* Read the NCB fingerprint. The fingerprint is four bytes long
* and starts in the 12th byte of the page.
*/
nand->cmdfunc(mtd, NAND_CMD_READ0, 12, page);
nand->read_buf(mtd, buffer, strlen(fingerprint));
/* Look for the fingerprint. */
if (!memcmp(buffer, fingerprint,
strlen(fingerprint))) {
found_an_ncb_fingerprint = true;
break;
}
}
/* Deselect chip 0. */
nand->select_chip(mtd, saved_chip_number);
/* Return. */
if (found_an_ncb_fingerprint)
pr_info(" Found a fingerprint\n");
else
pr_info(" No fingerprint found\n");
return found_an_ncb_fingerprint;
}
/**
* write_transcription_stamp() - Writes a transcription stamp.
*
* @this: Per-device data.
*/
static int write_transcription_stamp(struct gpmi_nfc_data *this)
{
struct device *dev = this->dev;
struct physical_geometry *physical = &this->physical_geometry;
struct boot_rom_geometry *rom_geo = &this->rom_geometry;
struct mil *mil = &this->mil;
struct mtd_info *mtd = &mil->mtd;
struct nand_chip *nand = &mil->nand;
unsigned int block_size_in_pages;
unsigned int search_area_size_in_strides;
unsigned int search_area_size_in_pages;
unsigned int search_area_size_in_blocks;
unsigned int block;
unsigned int stride;
unsigned int page;
loff_t byte;
uint8_t *buffer = nand->buffers->databuf;
int saved_chip_number;
int status;
/* Compute the search area geometry. */
block_size_in_pages = physical->block_size_in_bytes >>
(ffs(physical->page_data_size_in_bytes) - 1);
search_area_size_in_strides = 1 << rom_geo->search_area_stride_exponent;
search_area_size_in_pages = search_area_size_in_strides *
rom_geo->stride_size_in_pages;
search_area_size_in_blocks =
(search_area_size_in_pages + (block_size_in_pages - 1)) /
/*-------------------------------------------------------*/
block_size_in_pages;
#if defined(DETAILED_INFO)
pr_info("--------------------\n");
pr_info("Search Area Geometry\n");
pr_info("--------------------\n");
pr_info("Search Area Size in Blocks : %u", search_area_size_in_blocks);
pr_info("Search Area Size in Strides: %u", search_area_size_in_strides);
pr_info("Search Area Size in Pages : %u", search_area_size_in_pages);
#endif
/* Select chip 0. */
saved_chip_number = mil->current_chip;
nand->select_chip(mtd, 0);
/* Loop over blocks in the first search area, erasing them. */
pr_info("Erasing the search area...\n");
for (block = 0; block < search_area_size_in_blocks; block++) {
/* Compute the page address. */
page = block * block_size_in_pages;
/* Erase this block. */
pr_info(" Erasing block 0x%x\n", block);
nand->cmdfunc(mtd, NAND_CMD_ERASE1, -1, page);
nand->cmdfunc(mtd, NAND_CMD_ERASE2, -1, -1);
/* Wait for the erase to finish. */
status = nand->waitfunc(mtd, nand);
if (status & NAND_STATUS_FAIL)
dev_err(dev, "[%s] Erase failed.\n", __func__);
}
/* Write the NCB fingerprint into the page buffer. */
memset(buffer, ~0, mtd->writesize);
memset(nand->oob_poi, ~0, mtd->oobsize);
memcpy(buffer + 12, fingerprint, strlen(fingerprint));
/* Loop through the first search area, writing NCB fingerprints. */
pr_info("Writing NCB fingerprints...\n");
for (stride = 0; stride < search_area_size_in_strides; stride++) {
/* Compute the page and byte addresses. */
page = stride * rom_geo->stride_size_in_pages;
byte = page * physical->page_data_size_in_bytes;
/* Write the first page of the current stride. */
pr_info(" Writing an NCB fingerprint in page 0x%x\n", page);
nand->cmdfunc(mtd, NAND_CMD_SEQIN, 0x00, page);
nand->ecc.write_page_raw(mtd, nand, buffer);
nand->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
/* Wait for the write to finish. */
status = nand->waitfunc(mtd, nand);
if (status & NAND_STATUS_FAIL)
dev_err(dev, "[%s] Write failed.\n", __func__);
}
/* Deselect chip 0. */
nand->select_chip(mtd, saved_chip_number);
/* Return success. */
return 0;
}
/* This structure represents the Boot ROM Helper for this version. */
struct boot_rom_helper gpmi_nfc_boot_rom_helper_v0 = {
.version = 0,
.description = "Single/dual-chip boot area, "
"no block mark swapping",
.swap_block_mark = false,
.set_geometry = set_geometry,
.check_transcription_stamp = check_transcription_stamp,
.write_transcription_stamp = write_transcription_stamp,
};
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