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path: root/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c
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Diffstat (limited to 'drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c')
-rw-r--r--drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c
new file mode 100644
index 000000000000..35321cc25546
--- /dev/null
+++ b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-rom-v0.c
@@ -0,0 +1,297 @@
+/*
+ * 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,
+};
generated by cgit v1.2.3 (git 2.0.4) at 2024-04-30 13:45:51 +0000