diff options
Diffstat (limited to 'drivers/mtd/nand/gpmi-nfc/gpmi-nfc-main.c')
| -rw-r--r-- | drivers/mtd/nand/gpmi-nfc/gpmi-nfc-main.c | 1879 |
1 files changed, 1879 insertions, 0 deletions
diff --git a/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-main.c b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-main.c new file mode 100644 index 000000000000..0143f1c358ff --- /dev/null +++ b/drivers/mtd/nand/gpmi-nfc/gpmi-nfc-main.c @@ -0,0 +1,1879 @@ +/* + * 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" + +/* + * This structure contains the "safe" GPMI timing that should succeed with any + * NAND Flash device (although, with less-than-optimal performance). + */ + +static struct gpmi_nfc_timing safe_timing = { + .data_setup_in_ns = 80, + .data_hold_in_ns = 60, + .address_setup_in_ns = 25, + .gpmi_sample_delay_in_ns = 6, + .tREA_in_ns = -1, + .tRLOH_in_ns = -1, + .tRHOH_in_ns = -1, +}; + +/* + * This array has a pointer to every NFC HAL structure. The probing process will + * find and install the one that matches the version given by the platform. + */ + +static struct nfc_hal *(nfc_hals[]) = { + &gpmi_nfc_hal_v0, + &gpmi_nfc_hal_v1, +}; + +/* + * This array has a pointer to every Boot ROM Helper structure. The probing + * process will find and install the one that matches the version given by the + * platform. + */ + +static struct boot_rom_helper *(boot_rom_helpers[]) = { + &gpmi_nfc_boot_rom_helper_v0, + &gpmi_nfc_boot_rom_helper_v1, +}; + +/** + * show_device_report() - Contains a shell script that creates a handy report. + * + * @d: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_report(struct device *dev, + struct device_attribute *attr, char *buf) +{ + + static const char *script = + "GPMISysDirectory=/sys/bus/platform/devices/gpmi-nfc.0\n" + "\n" + "NodeList='\n" + "physical_geometry\n" + "nfc_info\n" + "nfc_geometry\n" + "timing\n" + "timing_diagram\n" + "rom_geometry\n" + "mtd_nand_info\n" + "mtd_info\n" + "'\n" + "\n" + "cd ${GPMISysDirectory}\n" + "\n" + "printf '\\n'\n" + "\n" + "for NodeName in ${NodeList}\n" + "do\n" + "\n" + " printf '--------------------------------------------\\n'\n" + " printf '%s\\n' ${NodeName}\n" + " printf '--------------------------------------------\\n'\n" + " printf '\\n'\n" + "\n" + " cat ${NodeName}\n" + "\n" + " printf '\\n'\n" + "\n" + "done\n" + ; + + return sprintf(buf, "%s", script); + +} + +/** + * show_device_numchips() - Shows the number of physical chips. + * + * This node is made obsolete by the physical_geometry node, but we keep it for + * backward compatibility (especially for kobs). + * + * @d: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_numchips(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct physical_geometry *physical = &this->physical_geometry; + + return sprintf(buf, "%d\n", physical->chip_count); + +} + +/** + * show_device_physical_geometry() - Shows the physical Flash device geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_physical_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct nand_device_info *info = &this->device_info; + struct physical_geometry *physical = &this->physical_geometry; + + return sprintf(buf, + "Description : %s\n" + "Chip Count : %u\n" + "Chip Size in Bytes : %llu\n" + "Block Size in Bytes : %u\n" + "Page Data Size in Bytes: %u\n" + "Page OOB Size in Bytes : %u\n" + , + info->description, + physical->chip_count, + physical->chip_size_in_bytes, + physical->block_size_in_bytes, + physical->page_data_size_in_bytes, + physical->page_oob_size_in_bytes + ); + +} + +/** + * show_device_nfc_info() - Shows the NFC-specific information. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_nfc_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct nfc_hal *nfc = this->nfc; + + return sprintf(buf, + "Version : %u\n" + "Description : %s\n" + "Max Chip Count : %u\n" + "Max Data Setup Cycles : 0x%x\n" + "Internal Data Setup in ns : %u\n" + "Max Sample Delay Factor : 0x%x\n" + "Max DLL Clock Period in ns: %u\n" + "Max DLL Delay in ns : %u\n" + , + nfc->version, + nfc->description, + nfc->max_chip_count, + nfc->max_data_setup_cycles, + nfc->internal_data_setup_in_ns, + nfc->max_sample_delay_factor, + nfc->max_dll_clock_period_in_ns, + nfc->max_dll_delay_in_ns + ); + +} + +/** + * show_device_nfc_geometry() - Shows the NFC view of the device geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_nfc_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct nfc_geometry *nfc = &this->nfc_geometry; + + return sprintf(buf, + "ECC Algorithm : %s\n" + "ECC Strength : %u\n" + "Page Size in Bytes : %u\n" + "Metadata Size in Bytes : %u\n" + "ECC Chunk Size in Bytes: %u\n" + "ECC Chunk Count : %u\n" + "Payload Size in Bytes : %u\n" + "Auxiliary Size in Bytes: %u\n" + "Auxiliary Status Offset: %u\n" + "Block Mark Byte Offset : %u\n" + "Block Mark Bit Offset : %u\n" + , + nfc->ecc_algorithm, + nfc->ecc_strength, + nfc->page_size_in_bytes, + nfc->metadata_size_in_bytes, + nfc->ecc_chunk_size_in_bytes, + nfc->ecc_chunk_count, + nfc->payload_size_in_bytes, + nfc->auxiliary_size_in_bytes, + nfc->auxiliary_status_offset, + nfc->block_mark_byte_offset, + nfc->block_mark_bit_offset + ); + +} + +/** + * show_device_rom_geometry() - Shows the Boot ROM Helper's geometry. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_rom_geometry(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct boot_rom_geometry *rom = &this->rom_geometry; + + return sprintf(buf, + "Boot Area Count : %u\n" + "Boot Area Size in Bytes : %u\n" + "Stride Size in Pages : %u\n" + "Seach Area Stride Exponent: %u\n" + , + rom->boot_area_count, + rom->boot_area_size_in_bytes, + rom->stride_size_in_pages, + rom->search_area_stride_exponent + ); + +} + +/** + * show_device_mtd_nand_info() - Shows the device's MTD NAND-specific info. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_mtd_nand_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + unsigned int j; + static const unsigned int columns = 8; + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + struct nand_chip *nand = &mil->nand; + + o += sprintf(buf + o, + "Options : 0x%08x\n" + "Chip Count : %u\n" + "Chip Size in Bytes : %llu\n" + "Minimum Writable Size in Bytes: %u\n" + "Page Shift : %u\n" + "Page Mask : 0x%x\n" + "Block Shift : %u\n" + "BBT Block Shift : %u\n" + "Chip Shift : %u\n" + "Block Mark Offset : %u\n" + "Cached Page Number : %d\n" + , + nand->options, + nand->numchips, + nand->chipsize, + nand->subpagesize, + nand->page_shift, + nand->pagemask, + nand->phys_erase_shift, + nand->bbt_erase_shift, + nand->chip_shift, + nand->badblockpos, + nand->pagebuf + ); + + o += sprintf(buf + o, + "ECC Byte Count : %u\n" + , + nand->ecc.layout->eccbytes + ); + + /* Loop over rows. */ + + for (i = 0; (i * columns) < nand->ecc.layout->eccbytes; i++) { + + /* Loop over columns within rows. */ + + for (j = 0; j < columns; j++) { + + if (((i * columns) + j) >= nand->ecc.layout->eccbytes) + break; + + o += sprintf(buf + o, " %3u", + nand->ecc.layout->eccpos[(i * columns) + j]); + + } + + o += sprintf(buf + o, "\n"); + + } + + o += sprintf(buf + o, + "OOB Available Bytes : %u\n" + , + nand->ecc.layout->oobavail + ); + + j = 0; + + for (i = 0; j < nand->ecc.layout->oobavail; i++) { + + j += nand->ecc.layout->oobfree[i].length; + + o += sprintf(buf + o, + " [%3u, %2u]\n" + , + nand->ecc.layout->oobfree[i].offset, + nand->ecc.layout->oobfree[i].length + ); + + } + + return o; + +} + +/** + * show_device_mtd_info() - Shows the device's MTD-specific information. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_mtd_info(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int o = 0; + unsigned int i; + unsigned int j; + static const unsigned int columns = 8; + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + struct mtd_info *mtd = &mil->mtd; + + o += sprintf(buf + o, + "Name : %s\n" + "Type : %u\n" + "Flags : 0x%08x\n" + "Size in Bytes : %llu\n" + "Erase Region Count : %d\n" + "Erase Size in Bytes: %u\n" + "Write Size in Bytes: %u\n" + "OOB Size in Bytes : %u\n" + "Errors Corrected : %u\n" + "Failed Reads : %u\n" + "Bad Block Count : %u\n" + "BBT Block Count : %u\n" + , + mtd->name, + mtd->type, + mtd->flags, + mtd->size, + mtd->numeraseregions, + mtd->erasesize, + mtd->writesize, + mtd->oobsize, + mtd->ecc_stats.corrected, + mtd->ecc_stats.failed, + mtd->ecc_stats.badblocks, + mtd->ecc_stats.bbtblocks + ); + + o += sprintf(buf + o, + "ECC Byte Count : %u\n" + , + mtd->ecclayout->eccbytes + ); + + /* Loop over rows. */ + + for (i = 0; (i * columns) < mtd->ecclayout->eccbytes; i++) { + + /* Loop over columns within rows. */ + + for (j = 0; j < columns; j++) { + + if (((i * columns) + j) >= mtd->ecclayout->eccbytes) + break; + + o += sprintf(buf + o, " %3u", + mtd->ecclayout->eccpos[(i * columns) + j]); + + } + + o += sprintf(buf + o, "\n"); + + } + + o += sprintf(buf + o, + "OOB Available Bytes: %u\n" + , + mtd->ecclayout->oobavail + ); + + j = 0; + + for (i = 0; j < mtd->ecclayout->oobavail; i++) { + + j += mtd->ecclayout->oobfree[i].length; + + o += sprintf(buf + o, + " [%3u, %2u]\n" + , + mtd->ecclayout->oobfree[i].offset, + mtd->ecclayout->oobfree[i].length + ); + + } + + return o; + +} + +/** + * show_device_timing_diagram() - Shows a timing diagram. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_timing_diagram(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct gpmi_nfc_platform_data *pdata = this->pdata; + struct nfc_hal *nfc = this->nfc; + struct gpmi_nfc_timing timing = nfc->timing; + struct gpmi_nfc_hardware_timing hardware_timing; + unsigned long clock_frequency_in_hz; + unsigned long clock_period_in_ns; + unsigned int data_setup_in_ns; + unsigned int dll_delay_shift; + unsigned int sample_delay_in_ns; + unsigned int tDS_in_ns; + unsigned int tOPEN_in_ns; + unsigned int tCLOSE_in_ns; + unsigned int tEYE_in_ns; + unsigned int tDELAY_in_ns; + unsigned int tDS; + unsigned int tOPEN; + unsigned int tCLOSE; + unsigned int tEYE; + unsigned int tDELAY; + const unsigned int diagram_width_in_chars = 55; + unsigned int diagram_width_in_ns; + int o = 0; + unsigned int i; + + /* + * If there are any timing characteristics we need, but don't know, we + * pretend they're zero. + */ + + if (timing.tREA_in_ns < 0) + timing.tREA_in_ns = 0; + + if (timing.tRHOH_in_ns < 0) + timing.tRHOH_in_ns = 0; + + /* Get information about the current/last I/O transaction. */ + + nfc->get_timing(this, &clock_frequency_in_hz, &hardware_timing); + + clock_period_in_ns = 1000000000 / clock_frequency_in_hz; + + /* Compute basic timing facts. */ + + data_setup_in_ns = + hardware_timing.data_setup_in_cycles * clock_period_in_ns; + + /* Compute data sample delay facts. */ + + dll_delay_shift = 3; + + if (hardware_timing.use_half_periods) + dll_delay_shift++; + + sample_delay_in_ns = + (hardware_timing.sample_delay_factor * clock_period_in_ns) >> + dll_delay_shift; + + /* Compute the basic metrics in the diagram, in nanoseconds. */ + + tDS_in_ns = data_setup_in_ns; + tOPEN_in_ns = pdata->max_prop_delay_in_ns + timing.tREA_in_ns; + tCLOSE_in_ns = pdata->min_prop_delay_in_ns + timing.tRHOH_in_ns; + tEYE_in_ns = tDS_in_ns + tCLOSE_in_ns - tOPEN_in_ns; + tDELAY_in_ns = sample_delay_in_ns; + + /* + * We need to translate nanosecond timings into character widths in the + * diagram. The first step is to discover how "wide" the diagram is in + * nanoseconds. That depends on which happens latest: the sample point + * or the close of the eye. + */ + + if (tCLOSE_in_ns >= tDELAY_in_ns) + diagram_width_in_ns = tDS_in_ns + tCLOSE_in_ns; + else + diagram_width_in_ns = tDS_in_ns + tDELAY_in_ns; + + /* Convert the metrics that appear in the diagram. */ + + tDS = (tDS_in_ns * diagram_width_in_chars) / diagram_width_in_ns; + tOPEN = (tOPEN_in_ns * diagram_width_in_chars) / diagram_width_in_ns; + tCLOSE = (tCLOSE_in_ns * diagram_width_in_chars) / diagram_width_in_ns; + tEYE = (tEYE_in_ns * diagram_width_in_chars) / diagram_width_in_ns; + tDELAY = (tDELAY_in_ns * diagram_width_in_chars) / diagram_width_in_ns; + + /* + * Show the results. + * + * This code is really ugly, but it draws a pretty picture :) + */ + + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, "Sample ______"); + for (i = 0; i < tDS; i++) + o += sprintf(buf + o, "_"); + if (tDELAY > 0) + for (i = 0; i < (tDELAY - 1); i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "|"); + for (i = 0; i < (diagram_width_in_chars - (tDS + tDELAY)); i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, "Strobe "); + for (i = 0; i < tDS; i++) + o += sprintf(buf + o, " "); + o += sprintf(buf + o, "|"); + if (tDELAY > 1) { + for (i = 2; i < tDELAY; i++) + o += sprintf(buf + o, "-"); + o += sprintf(buf + o, "|"); + } + o += sprintf(buf + o, " tDELAY\n"); + + + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " tDS "); + o += sprintf(buf + o, "|"); + if (tDS > 1) { + for (i = 2; i < tDS; i++) + o += sprintf(buf + o, "-"); + o += sprintf(buf + o, "|"); + } + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " ______"); + for (i = 0; i < tDS; i++) + o += sprintf(buf + o, " "); + for (i = 0; i < (diagram_width_in_chars - tDS); i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, "RDN "); + if (tDS > 0) { + if (tDS == 1) + o += sprintf(buf + o, "V"); + else { + o += sprintf(buf + o, "\\"); + for (i = 2; i < tDS; i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "/"); + } + } + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " tOPEN "); + o += sprintf(buf + o, "|"); + if (tOPEN > 1) { + for (i = 2; i < tOPEN; i++) + o += sprintf(buf + o, "-"); + o += sprintf(buf + o, "|"); + } + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " "); + for (i = 0; i < tDS; i++) + o += sprintf(buf + o, " "); + o += sprintf(buf + o, "|"); + if (tCLOSE > 1) { + for (i = 2; i < tCLOSE; i++) + o += sprintf(buf + o, "-"); + o += sprintf(buf + o, "|"); + } + o += sprintf(buf + o, " tCLOSE\n"); + + + o += sprintf(buf + o, " "); + for (i = 0; i < tOPEN; i++) + o += sprintf(buf + o, " "); + if (tEYE > 2) { + o += sprintf(buf + o, " "); + for (i = 2; i < tEYE; i++) + o += sprintf(buf + o, "_"); + } + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, "Data ______"); + for (i = 0; i < tOPEN; i++) + o += sprintf(buf + o, "_"); + if (tEYE > 0) { + if (tEYE == 1) + o += sprintf(buf + o, "|"); + else { + o += sprintf(buf + o, "/"); + for (i = 2; i < tEYE; i++) + o += sprintf(buf + o, " "); + o += sprintf(buf + o, "\\"); + } + } + for (i = 0; i < (diagram_width_in_chars - (tOPEN + tEYE)); i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " "); + for (i = 0; i < tOPEN; i++) + o += sprintf(buf + o, " "); + if (tEYE > 0) { + if (tEYE == 1) + o += sprintf(buf + o, "|"); + else { + o += sprintf(buf + o, "\\"); + for (i = 2; i < tEYE; i++) + o += sprintf(buf + o, "_"); + o += sprintf(buf + o, "/"); + } + } + o += sprintf(buf + o, "\n"); + + + o += sprintf(buf + o, " "); + for (i = 0; i < tOPEN; i++) + o += sprintf(buf + o, " "); + o += sprintf(buf + o, "|"); + if (tEYE > 1) { + for (i = 2; i < tEYE; i++) + o += sprintf(buf + o, "-"); + o += sprintf(buf + o, "|"); + } + o += sprintf(buf + o, " tEYE\n"); + + + o += sprintf(buf + o, "\n"); + o += sprintf(buf + o, "tDS : %u ns\n", tDS_in_ns); + o += sprintf(buf + o, "tOPEN : %u ns\n", tOPEN_in_ns); + o += sprintf(buf + o, "tCLOSE: %u ns\n", tCLOSE_in_ns); + o += sprintf(buf + o, "tEYE : %u ns\n", tEYE_in_ns); + o += sprintf(buf + o, "tDELAY: %u ns\n", tDELAY_in_ns); + o += sprintf(buf + o, "\n"); + + + return o; + +} + +/** + * store_device_invalidate_page_cache() - Invalidates the device's page cache. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_invalidate_page_cache(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + + /* Invalidate the page cache. */ + + this->mil.nand.pagebuf = -1; + + /* Return success. */ + + return size; + +} + +/** + * store_device_mark_block_bad() - Marks a block as bad. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_mark_block_bad(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + struct mtd_info *mtd = &mil->mtd; + struct nand_chip *nand = &mil->nand; + unsigned long block_number; + loff_t byte_address; + int error; + + /* Look for nonsense. */ + + if (!size) + return -EINVAL; + + /* Try to understand the block number. */ + + if (strict_strtoul(buf, 0, &block_number)) + return -EINVAL; + + /* Compute the byte address of this block. */ + + byte_address = block_number << nand->phys_erase_shift; + + /* Attempt to mark the block bad. */ + + error = mtd->block_markbad(mtd, byte_address); + + if (error) + return error; + + /* Return success. */ + + return size; + +} + +/** + * show_device_ignorebad() - Shows the value of the 'ignorebad' flag. + * + * @d: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_ignorebad(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + + return sprintf(buf, "%d\n", mil->ignore_bad_block_marks); +} + +/** + * store_device_ignorebad() - Sets the value of the 'ignorebad' flag. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_ignorebad(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + const char *p = buf; + unsigned long v; + + /* Try to make sense of what arrived from user space. */ + + if (strict_strtoul(p, 0, &v) < 0) + return size; + + if (v > 0) + v = 1; + + /* Only do something if the value is changing. */ + + if (v != mil->ignore_bad_block_marks) { + + if (v) { + + /* + * If control arrives here, we want to begin ignoring + * bad block marks. Reach into the NAND Flash MTD data + * structures and set the in-memory BBT pointer to NULL. + * This will cause the NAND Flash MTD code to believe + * that it never created a BBT and force it to call our + * block_bad function. + * + * See mil_block_bad for more details. + */ + + mil->saved_bbt = mil->nand.bbt; + mil->nand.bbt = 0; + + } else { + + /* + * If control arrives here, we want to stop ignoring + * bad block marks. Restore the NAND Flash MTD's pointer + * to its in-memory BBT. + */ + + mil->nand.bbt = mil->saved_bbt; + + } + + mil->ignore_bad_block_marks = v; + + } + + return size; + +} + +/** + * show_device_inject_ecc_error() - Shows the device's error injection flag. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_inject_ecc_error(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + + return sprintf(buf, "%d\n", mil->inject_ecc_error); + +} + +/** + * store_device_inject_ecc_error() - Sets the device's error injection flag. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_inject_ecc_error(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct mil *mil = &this->mil; + long new_inject_ecc_error; + + /* Look for nonsense. */ + + if (!size) + return -EINVAL; + + /* Try to understand the ECC error count. */ + + if (strict_strtol(buf, 0, &new_inject_ecc_error)) + return -EINVAL; + + /* Store the value. */ + + mil->inject_ecc_error = new_inject_ecc_error; + + /* Return success. */ + + return size; + +} + +/** + * show_device_timing_help() - Show help for setting timing. + * + * @d: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_timing_help(struct device *dev, + struct device_attribute *attr, char *buf) +{ + + static const char *help = + "<Data Setup>,<Data Hold>,<Address Setup>,<Sample Delay>," + "<tREA>,<tRLOH>,<tRHOH>\n"; + + return sprintf(buf, "%s", help); + +} + +/** + * show_device_timing() - Shows the current timing. + * + * @d: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer that will receive a representation of the attribute. + */ +static ssize_t show_device_timing(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct gpmi_nfc_platform_data *pdata = this->pdata; + struct nfc_hal *nfc = this->nfc; + struct gpmi_nfc_timing *recorded = &nfc->timing; + unsigned long clock_frequency_in_hz; + unsigned long clock_period_in_ns; + struct gpmi_nfc_hardware_timing hardware; + unsigned int effective_data_setup_in_ns; + unsigned int effective_data_hold_in_ns; + unsigned int effective_address_setup_in_ns; + unsigned int dll_delay_shift; + unsigned int effective_sample_delay_in_ns; + + /* Get information about the current/last I/O transaction. */ + + nfc->get_timing(this, &clock_frequency_in_hz, &hardware); + + clock_period_in_ns = 1000000000 / clock_frequency_in_hz; + + /* Compute basic timing facts. */ + + effective_data_setup_in_ns = + hardware.data_setup_in_cycles * clock_period_in_ns; + effective_data_hold_in_ns = + hardware.data_hold_in_cycles * clock_period_in_ns; + effective_address_setup_in_ns = + hardware.address_setup_in_cycles * clock_period_in_ns; + + /* Compute data sample delay facts. */ + + dll_delay_shift = 3; + + if (hardware.use_half_periods) + dll_delay_shift++; + + effective_sample_delay_in_ns = + (hardware.sample_delay_factor * clock_period_in_ns) >> + dll_delay_shift; + + /* Show the results. */ + + return sprintf(buf, + "Minimum Propagation Delay in ns : %u\n" + "Maximum Propagation Delay in ns : %u\n" + "Clock Frequency in Hz : %lu\n" + "Clock Period in ns : %lu\n" + "Recorded Data Setup in ns : %d\n" + "Hardware Data Setup in cycles : %u\n" + "Effective Data Setup in ns : %u\n" + "Recorded Data Hold in ns : %d\n" + "Hardware Data Hold in cycles : %u\n" + "Effective Data Hold in ns : %u\n" + "Recorded Address Setup in ns : %d\n" + "Hardware Address Setup in cycles: %u\n" + "Effective Address Setup in ns : %u\n" + "Using Half Period : %s\n" + "Recorded Sample Delay in ns : %d\n" + "Hardware Sample Delay Factor : %u\n" + "Effective Sample Delay in ns : %u\n" + "Recorded tREA in ns : %d\n" + "Recorded tRLOH in ns : %d\n" + "Recorded tRHOH in ns : %d\n" + , + pdata->min_prop_delay_in_ns, + pdata->max_prop_delay_in_ns, + clock_frequency_in_hz, + clock_period_in_ns, + recorded->data_setup_in_ns, + hardware .data_setup_in_cycles, + effective_data_setup_in_ns, + recorded->data_hold_in_ns, + hardware .data_hold_in_cycles, + effective_data_hold_in_ns, + recorded->address_setup_in_ns, + hardware .address_setup_in_cycles, + effective_address_setup_in_ns, + hardware .use_half_periods ? "Yes" : "No", + recorded->gpmi_sample_delay_in_ns, + hardware .sample_delay_factor, + effective_sample_delay_in_ns, + recorded->tREA_in_ns, + recorded->tRLOH_in_ns, + recorded->tRHOH_in_ns); + +} + +/** + * store_device_timing() - Sets the current timing. + * + * @dev: The device of interest. + * @attr: The attribute of interest. + * @buf: A buffer containing a new attribute value. + * @size: The size of the buffer. + */ +static ssize_t store_device_timing(struct device *dev, + struct device_attribute *attr, const char *buf, size_t size) +{ + struct gpmi_nfc_data *this = dev_get_drvdata(dev); + struct nfc_hal *nfc = this->nfc; + const char *p = buf; + const char *q; + char tmps[20]; + long t; + struct gpmi_nfc_timing new; + + int8_t *field_pointers[] = { + &new.data_setup_in_ns, + &new.data_hold_in_ns, + &new.address_setup_in_ns, + &new.gpmi_sample_delay_in_ns, + &new.tREA_in_ns, + &new.tRLOH_in_ns, + &new.tRHOH_in_ns, + NULL, + }; + + int8_t **field_pointer = field_pointers; + + /* + * Loop over comma-separated timing values in the incoming buffer, + * assigning them to fields in the timing structure as we go along. + */ + + while (*field_pointer != NULL) { + + /* Clear out the temporary buffer. */ + + memset(tmps, 0, sizeof(tmps)); + + /* Copy the timing value into the temporary buffer. */ + + q = strchr(p, ','); + if (q) + strncpy(tmps, p, min_t(int, sizeof(tmps) - 1, q - p)); + else + strncpy(tmps, p, sizeof(tmps) - 1); + + /* Attempt to convert the current timing value. */ + + if (strict_strtol(tmps, 0, &t) < 0) + return -EINVAL; + + if ((t > 127) || (t < -128)) + return -EINVAL; + + /* Assign this value to the current field. */ + + **field_pointer = (int8_t) t; + field_pointer++; + + /* Check if we ran out of input too soon. */ + + if (!q && *field_pointer) + return -EINVAL; + + /* Move past the comma to the next timing value. */ + + p = q + 1; + + } + + /* Hand over the timing to the NFC. */ + + nfc->set_timing(this, &new); + + /* Return success. */ + + return size; + +} + +/* Device attributes that appear in sysfs. */ + +static DEVICE_ATTR(report , 0555, show_device_report , 0); +static DEVICE_ATTR(numchips , 0444, show_device_numchips , 0); +static DEVICE_ATTR(physical_geometry, 0444, show_device_physical_geometry, 0); +static DEVICE_ATTR(nfc_info , 0444, show_device_nfc_info , 0); +static DEVICE_ATTR(nfc_geometry , 0444, show_device_nfc_geometry , 0); +static DEVICE_ATTR(rom_geometry , 0444, show_device_rom_geometry , 0); +static DEVICE_ATTR(mtd_nand_info , 0444, show_device_mtd_nand_info , 0); +static DEVICE_ATTR(mtd_info , 0444, show_device_mtd_info , 0); +static DEVICE_ATTR(timing_diagram , 0444, show_device_timing_diagram , 0); +static DEVICE_ATTR(timing_help , 0444, show_device_timing_help , 0); + +static DEVICE_ATTR(invalidate_page_cache, 0644, + 0, store_device_invalidate_page_cache); + +static DEVICE_ATTR(mark_block_bad, 0200, + 0, store_device_mark_block_bad); + +static DEVICE_ATTR(ignorebad, 0644, + show_device_ignorebad, store_device_ignorebad); + +static DEVICE_ATTR(inject_ecc_error, 0644, + show_device_inject_ecc_error, store_device_inject_ecc_error); + +static DEVICE_ATTR(timing, 0644, + show_device_timing, store_device_timing); + +static struct device_attribute *device_attributes[] = { + &dev_attr_report, + &dev_attr_numchips, + &dev_attr_physical_geometry, + &dev_attr_nfc_info, + &dev_attr_nfc_geometry, + &dev_attr_rom_geometry, + &dev_attr_mtd_nand_info, + &dev_attr_mtd_info, + &dev_attr_invalidate_page_cache, + &dev_attr_mark_block_bad, + &dev_attr_ignorebad, + &dev_attr_inject_ecc_error, + &dev_attr_timing, + &dev_attr_timing_help, + &dev_attr_timing_diagram, +}; + +/** + * validate_the_platform() - Validates information about the platform. + * + * @pdev: A pointer to the platform device data structure. + */ +static int validate_the_platform(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct gpmi_nfc_platform_data *pdata = pdev->dev.platform_data; + + /* Validate the clock name. */ + + if (!pdata->clock_name) { + dev_err(dev, "No clock name\n"); + return -ENXIO; + } + + /* Validate the partitions. */ + + if ((pdata->partitions && (!pdata->partition_count)) || + (!pdata->partitions && (pdata->partition_count))) { + dev_err(dev, "Bad partition data\n"); + return -ENXIO; + } + + /* Return success */ + + return 0; + +} + +/** + * acquire_register_block() - Tries to acquire and map a register block. + * + * @this: Per-device data. + * @resource_name: The name of the resource. + * @reg_block_base: A pointer to a variable that will receive the address of + * the mapped register block. + */ +static int acquire_register_block(struct gpmi_nfc_data *this, + const char *resource_name, void **reg_block_base) +{ + struct platform_device *pdev = this->pdev; + struct device *dev = this->dev; + void *p; + struct resource *r; + + /* Attempt to get information about the given resource. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_MEM, resource_name); + + if (!r) { + dev_err(dev, "Can't get resource information for '%s'\n", + resource_name); + return -ENXIO; + } + + /* Attempt to remap the register block. */ + + p = ioremap(r->start, r->end - r->start + 1); + + if (!p) { + dev_err(dev, "Can't remap %s\n", resource_name); + return -EIO; + } + + /* If control arrives here, everything went fine. */ + + *reg_block_base = p; + + return 0; + +} + +/** + * release_register_block() - Releases a register block. + * + * @this: Per-device data. + * @reg_block_base: A pointer to the mapped register block. + */ +static void release_register_block(struct gpmi_nfc_data *this, + void *reg_block_base) +{ + iounmap(reg_block_base); +} + +/** + * acquire_interrupt() - Tries to acquire an interrupt. + * + * @this: Per-device data. + * @resource_name: The name of the resource. + * @interrupt_handler: A pointer to the function that will handle interrupts + * from this interrupt number. + * @interrupt_number: A pointer to a variable that will receive the acquired + * interrupt number. + */ +static int acquire_interrupt( + struct gpmi_nfc_data *this, const char *resource_name, + irq_handler_t interrupt_handler, int *interrupt_number) +{ + struct platform_device *pdev = this->pdev; + struct device *dev = this->dev; + int error = 0; + int i; + + /* Attempt to get information about the given resource. */ + + i = platform_get_irq_byname(pdev, resource_name); + + if (i < 0) { + dev_err(dev, "Can't get resource information for '%s'\n", + resource_name); + return -ENXIO; + } + + /* Attempt to own the interrupt. */ + + error = request_irq(i, interrupt_handler, 0, resource_name, this); + + if (error) { + dev_err(dev, "Can't own %s\n", resource_name); + return -EIO; + } + + /* If control arrives here, everything went fine. */ + + *interrupt_number = i; + + return 0; + +} + +/** + * release_interrupt() - Releases an interrupt. + * + * @this: Per-device data. + * @interrupt_number: The interrupt number. + */ +static void release_interrupt(struct gpmi_nfc_data *this, int interrupt_number) +{ + free_irq(interrupt_number, this); +} + +/** + * acquire_dma_channels() - Tries to acquire DMA channels. + * + * @this: Per-device data. + * @resource_name: The name of the resource. + * @low_channel: A pointer to a variable that will receive the acquired + * low DMA channel number. + * @high_channel: A pointer to a variable that will receive the acquired + * high DMA channel number. + */ +static int acquire_dma_channels( + struct gpmi_nfc_data *this, const char *resource_name, + unsigned *low_channel, unsigned *high_channel) +{ + struct platform_device *pdev = this->pdev; + struct device *dev = this->dev; + int error = 0; + struct resource *r; + unsigned int dma_channel; + + /* Attempt to get information about the given resource. */ + + r = platform_get_resource_byname(pdev, IORESOURCE_DMA, resource_name); + + if (!r) { + dev_err(dev, "Can't get resource information for '%s'\n", + resource_name); + return -ENXIO; + } + + /* Loop over DMA channels, attempting to own them. */ + + for (dma_channel = r->start; dma_channel <= r->end; dma_channel++) { + + /* Attempt to own the current channel. */ + + error = mxs_dma_request(dma_channel, dev, resource_name); + + /* Check if we successfully acquired the current channel. */ + + if (error) { + + dev_err(dev, "Can't acquire DMA channel %u\n", + dma_channel); + + /* Free all the channels we've already acquired. */ + + while (--dma_channel >= 0) + mxs_dma_release(dma_channel, dev); + + return error; + + } + + /* + * If control arrives here, we successfully acquired the + * current channel. Continue initializing it. + */ + + mxs_dma_reset(dma_channel); + mxs_dma_ack_irq(dma_channel); + + } + + /* If control arrives here, all went well. */ + + *low_channel = r->start; + *high_channel = r->end; + + return 0; + +} + +/** + * release_dma_channels() - Releases DMA channels. + * + * @this: Per-device data. + * @low_channel: The low DMA channel number. + * @high_channel: The high DMA channel number. + */ +static void release_dma_channels(struct gpmi_nfc_data *this, + unsigned low_channel, unsigned high_channel) +{ + struct device *dev = this->dev; + unsigned int i; + + for (i = low_channel; i <= high_channel; i++) + mxs_dma_release(i, dev); +} + +/** + * acquire_clock() - Tries to acquire a clock. + * + * @this: Per-device data. + * @resource_name: The name of the clock. + * @high_channel: A pointer to a variable that will receive the acquired + * clock address. + */ +static int acquire_clock(struct gpmi_nfc_data *this, + const char *clock_name, struct clk **clock) +{ + struct device *dev = this->dev; + int error = 0; + struct clk *c; + + /* Try to get the clock. */ + + c = clk_get(dev, clock_name); + + if (IS_ERR(c)) { + error = PTR_ERR(c); + dev_err(dev, "Can't own clock %s\n", clock_name); + return error; + } + + /* If control arrives here, everything went fine. */ + + *clock = c; + + return 0; + +} + +/** + * release_clock() - Releases a clock. + * + * @this: Per-device data. + * @clock: A pointer to the clock structure. + */ +static void release_clock(struct gpmi_nfc_data *this, struct clk *clock) +{ + clk_disable(clock); + clk_put(clock); +} + +/** + * acquire_resources() - Tries to acquire resources. + * + * @this: Per-device data. + */ +static int acquire_resources(struct gpmi_nfc_data *this) +{ + struct gpmi_nfc_platform_data *pdata = this->pdata; + struct resources *resources = &this->resources; + int error = 0; + + /* Attempt to acquire the GPMI register block. */ + + error = acquire_register_block(this, + GPMI_NFC_GPMI_REGS_ADDR_RES_NAME, &(resources->gpmi_regs)); + + if (error) + goto exit_gpmi_regs; + + /* Attempt to acquire the BCH register block. */ + + error = acquire_register_block(this, + GPMI_NFC_BCH_REGS_ADDR_RES_NAME, &(resources->bch_regs)); + + if (error) + goto exit_bch_regs; + + /* Attempt to acquire the BCH interrupt. */ + + error = acquire_interrupt(this, + GPMI_NFC_BCH_INTERRUPT_RES_NAME, + gpmi_nfc_bch_isr, &(resources->bch_interrupt)); + + if (error) + goto exit_bch_interrupt; + + /* Attempt to acquire the DMA channels. */ + + error = acquire_dma_channels(this, + GPMI_NFC_DMA_CHANNELS_RES_NAME, + &(resources->dma_low_channel), &(resources->dma_high_channel)); + + if (error) + goto exit_dma_channels; + + /* Attempt to acquire the DMA interrupt. */ + + error = acquire_interrupt(this, + GPMI_NFC_DMA_INTERRUPT_RES_NAME, + gpmi_nfc_dma_isr, &(resources->dma_interrupt)); + + if (error) + goto exit_dma_interrupt; + + /* Attempt to acquire our clock. */ + + error = acquire_clock(this, pdata->clock_name, &(resources->clock)); + + if (error) + goto exit_clock; + + /* If control arrives here, all went well. */ + + return 0; + + /* Control arrives here if something went wrong. */ + +exit_clock: + release_interrupt(this, resources->dma_interrupt); +exit_dma_interrupt: + release_dma_channels(this, + resources->dma_low_channel, resources->dma_high_channel); +exit_dma_channels: + release_interrupt(this, resources->bch_interrupt); +exit_bch_interrupt: + release_register_block(this, resources->bch_regs); +exit_bch_regs: + release_register_block(this, resources->gpmi_regs); +exit_gpmi_regs: + + return error; + +} + +/** + * release_resources() - Releases resources. + * + * @this: Per-device data. + */ +static void release_resources(struct gpmi_nfc_data *this) +{ + struct resources *resources = &this->resources; + + release_clock(this, resources->clock); + release_register_block(this, resources->gpmi_regs); + release_register_block(this, resources->bch_regs); + release_interrupt(this, resources->bch_interrupt); + release_dma_channels(this, + resources->dma_low_channel, resources->dma_high_channel); + release_interrupt(this, resources->dma_interrupt); +} + +/** + * set_up_nfc_hal() - Sets up the NFC HAL. + * + * @this: Per-device data. + */ +static int set_up_nfc_hal(struct gpmi_nfc_data *this) +{ + struct gpmi_nfc_platform_data *pdata = this->pdata; + struct device *dev = this->dev; + struct nfc_hal *nfc; + int error = 0; + unsigned int i; + + /* Attempt to find an NFC HAL that matches the given version. */ + + for (i = 0; i < ARRAY_SIZE(nfc_hals); i++) { + + nfc = nfc_hals[i]; + + if (nfc->version == pdata->nfc_version) { + this->nfc = nfc; + break; + } + + } + + /* Check if we found a HAL. */ + + if (i >= ARRAY_SIZE(nfc_hals)) { + dev_err(dev, "Unkown NFC version %u\n", pdata->nfc_version); + return -ENXIO; + } + + pr_info("NFC: Version %u, %s\n", nfc->version, nfc->description); + + /* + * Check if we can handle the number of chips called for by the platform + * data. + */ + + if (pdata->max_chip_count > nfc->max_chip_count) { + dev_err(dev, "Platform data calls for %u chips " + "but NFC supports a max of %u.\n", + pdata->max_chip_count, nfc->max_chip_count); + return -ENXIO; + } + + /* Initialize the NFC HAL. */ + + error = nfc->init(this); + + if (error) + return error; + + /* Set up safe timing. */ + + nfc->set_timing(this, &safe_timing); + + /* + * If control arrives here, all is well. + */ + + return 0; + +} + +/** + * set_up_boot_rom_helper() - Sets up the Boot ROM Helper. + * + * @this: Per-device data. + */ +static int set_up_boot_rom_helper(struct gpmi_nfc_data *this) +{ + struct gpmi_nfc_platform_data *pdata = this->pdata; + struct device *dev = this->dev; + unsigned int i; + struct boot_rom_helper *rom; + + /* Attempt to find a Boot ROM Helper that matches the given version. */ + + for (i = 0; i < ARRAY_SIZE(boot_rom_helpers); i++) { + + rom = boot_rom_helpers[i]; + + if (rom->version == pdata->boot_rom_version) { + this->rom = rom; + break; + } + + } + + /* Check if we found a Boot ROM Helper. */ + + if (i >= ARRAY_SIZE(boot_rom_helpers)) { + dev_err(dev, "Unkown Boot ROM version %u\n", + pdata->boot_rom_version); + return -ENXIO; + } + + pr_info("Boot ROM: Version %u, %s\n", rom->version, rom->description); + + /* + * If control arrives here, all is well. + */ + + return 0; + +} + +/** + * manage_sysfs_files() - Creates/removes sysfs files for this device. + * + * @this: Per-device data. + */ +static void manage_sysfs_files(struct gpmi_nfc_data *this, int create) +{ + struct device *dev = this->dev; + int error; + unsigned int i; + struct device_attribute **attr; + + for (i = 0, attr = device_attributes; + i < ARRAY_SIZE(device_attributes); i++, attr++) { + + if (create) { + error = device_create_file(dev, *attr); + if (error) { + while (--attr >= device_attributes) + device_remove_file(dev, *attr); + return; + } + } else { + device_remove_file(dev, *attr); + } + + } + +} + +/** + * gpmi_nfc_probe() - Probes for a device and, if possible, takes ownership. + * + * @pdev: A pointer to the platform device data structure. + */ +static int gpmi_nfc_probe(struct platform_device *pdev) +{ + int error = 0; + struct device *dev = &pdev->dev; + struct gpmi_nfc_platform_data *pdata = pdev->dev.platform_data; + struct gpmi_nfc_data *this = 0; + + /* Validate the platform device data. */ + + error = validate_the_platform(pdev); + + if (error) + goto exit_validate_platform; + + /* Allocate memory for the per-device data. */ + + this = kzalloc(sizeof(*this), GFP_KERNEL); + + if (!this) { + dev_err(dev, "Failed to allocate per-device memory\n"); + error = -ENOMEM; + goto exit_allocate_this; + } + + /* Set up our data structures. */ + + platform_set_drvdata(pdev, this); + + this->pdev = pdev; + this->dev = &pdev->dev; + this->pdata = pdata; + + /* Acquire the resources we need. */ + + error = acquire_resources(this); + + if (error) + goto exit_acquire_resources; + + /* Set up the NFC. */ + + error = set_up_nfc_hal(this); + + if (error) + goto exit_nfc_init; + + /* Set up the platform. */ + + if (pdata->platform_init) + error = pdata->platform_init(pdata->max_chip_count); + + if (error) + goto exit_platform_init; + + /* Set up the Boot ROM Helper. */ + + error = set_up_boot_rom_helper(this); + + if (error) + goto exit_boot_rom_helper_init; + + /* Initialize the MTD Interface Layer. */ + + error = gpmi_nfc_mil_init(this); + + if (error) + goto exit_mil_init; + + /* Create sysfs entries for this device. */ + + manage_sysfs_files(this, true); + + /* Return success. */ + + return 0; + + /* Error return paths begin here. */ + +exit_mil_init: +exit_boot_rom_helper_init: + if (pdata->platform_exit) + pdata->platform_exit(pdata->max_chip_count); +exit_platform_init: + this->nfc->exit(this); +exit_nfc_init: + release_resources(this); +exit_acquire_resources: + platform_set_drvdata(pdev, NULL); + kfree(this); +exit_allocate_this: +exit_validate_platform: + return error; + +} + +/** + * gpmi_nfc_remove() - Dissociates this driver from the given device. + * + * @pdev: A pointer to the platform device data structure. + */ +static int __exit gpmi_nfc_remove(struct platform_device *pdev) +{ + struct gpmi_nfc_data *this = platform_get_drvdata(pdev); + struct gpmi_nfc_platform_data *pdata = this->pdata; + + manage_sysfs_files(this, false); + gpmi_nfc_mil_exit(this); + if (pdata->platform_exit) + pdata->platform_exit(pdata->max_chip_count); + this->nfc->exit(this); + release_resources(this); + platform_set_drvdata(pdev, NULL); + kfree(this); + + return 0; +} + +#ifdef CONFIG_PM + +/** + * gpmi_nfc_suspend() - Puts the NFC into a low power state. + * + * @pdev: A pointer to the platform device data structure. + * @state: The new power state. + */ +static int gpmi_nfc_suspend(struct platform_device *pdev, pm_message_t state) +{ + return 0; +} + +/** + * gpmi_nfc_resume() - Brings the NFC back from a low power state. + * + * @pdev: A pointer to the platform device data structure. + */ +static int gpmi_nfc_resume(struct platform_device *pdev) +{ + return 0; +} + +#else + +#define suspend NULL +#define resume NULL + +#endif /* CONFIG_PM */ + +/* + * This structure represents this driver to the platform management system. + */ +static struct platform_driver gpmi_nfc_driver = { + .driver = { + .name = GPMI_NFC_DRIVER_NAME, + }, + .probe = gpmi_nfc_probe, + .remove = __exit_p(gpmi_nfc_remove), + .suspend = gpmi_nfc_suspend, + .resume = gpmi_nfc_resume, +}; + +/** + * gpmi_nfc_init() - Initializes this module. + */ +static int __init gpmi_nfc_init(void) +{ + + pr_info("i.MX GPMI NFC\n"); + + /* Register this driver with the platform management system. */ + + if (platform_driver_register(&gpmi_nfc_driver) != 0) { + pr_err("i.MX GPMI NFC driver registration failed\n"); + return -ENODEV; + } + + /* Return success. */ + + return 0; + +} + +/** + * gpmi_nfc_exit() - Deactivates this module. + */ +static void __exit gpmi_nfc_exit(void) +{ + platform_driver_unregister(&gpmi_nfc_driver); +} + +module_init(gpmi_nfc_init); +module_exit(gpmi_nfc_exit); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("i.MX GPMI NAND Flash Controller Driver"); +MODULE_LICENSE("GPL"); |