![Linus Torvalds](/assets/img/avatar_default.png)
Core changes: * Rework core functions to avoid duplicating generic checks in NAND/OneNAND sub-layers * Update the MAINTAINERS entry to reflect the fact that MTD maintainers now use a single git tree Driver changes: * CFI: use macros instead of inline functions to limit stack usage and make KASAN happy NAND changes: Core changes: * Fix NAND_CMD_NONE handling in nand_command[_lp]() hooks * Introduce the ->exec_op() infrastructure * Rework NAND buffers handling * Fix ECC requirements for K9F4G08U0D * Fix nand_do_read_oob() to return the number of bitflips * Mark K9F1G08U0E as not supporting subpage writes Driver changes: * MTK: Rework the driver to support new IP versions * OMAP OneNAND: Full rework to use new APIs (libgpio, dmaengine) and fix DT support * Marvell: Add a new driver to replace the pxa3xx one SPI NOR changes: Core changes: * Add support to new ISSI and Cypress/Spansion memory parts. * Fix support of Micron memories by checking error bits in the FSR. * Fix update of block-protection bits by reading back the SR. * Restore the internal state of the SPI flash memory when removing the device. Driver changes: * Maintenance for Freescale, Intel and Metiatek drivers. * Add support of the direct access mode for the Cadence QSPI controller. -----BEGIN PGP SIGNATURE----- iQJABAABCAAqBQJabumAIxxib3Jpcy5icmV6aWxsb25AZnJlZS1lbGVjdHJvbnMu Y29tAAoJEGXtNgF+CLcA0eAP/1s4u/Vs0RaDL2Jog0z+3fdx9HKYTK01hiQoe5Vf 0ouGH0lR9usAmmJlXxxNpBHFvJxsofJoCNaciHAiydCMBpX6oAQMYMMcPs4Qo7C/ vydLBDBmKZNyQ9dv6FbjP+3Y/5drIGF+VfxXZwhGA3lwP5CSVbB9ndI8+A5bScIV m2RMOA/lorbNHQahEkt7FHd92yQxBXlbhHBf5Foy2dGhO3rpTWzL/d1KPAkcfeli ehjfazkbuwFxGlYBFsrWxsnm0zqrqIWtdTE5/0i8iC1FfbxL5KjRnAFg8AsXIepn C2rCAxM/890mIFypT/8xhu+1u8+Bmb1r/pA9G+f3zpkiAHcUGC3eMO3IhX/jkcAd jCD/zeaSW8uHrBoJA6mGhO1tkBA97w15XCQC38UZkRMaJsY8Rv50ST4afA4in7mi bdRnpOOBYsBv9LvLm+FzQ0EgRQl642mFY8rae+gAjkF/zt8zGHSt6UNgtwMRxqZJ ns/TyhNm7roYV3cPpAgOWK//9XAGII9YZ6x9XmPNZLq62yf+zqJnfeuy7bXATRfG GGYk6wd+VdN+Ax2mqVKEJMCArjz0kLAHOtpIwv2/RxB1dlNMdugaDPUcqFteZbXh wlgORLXLqZ8jfy+ITFB5HMDs/NMyuRr815jdPGZafHIx8xOBQD32Izv7cpYctfWU f2NU =Mxo2 -----END PGP SIGNATURE----- Merge tag 'mtd/for-4.16' of git://git.infradead.org/linux-mtd Pull MTD updates from Boris Brezillon: "MTD core changes: - Rework core functions to avoid duplicating generic checks in NAND/OneNAND sub-layers - Update the MAINTAINERS entry to reflect the fact that MTD maintainers now use a single git tree MTD driver changes: - CFI: use macros instead of inline functions to limit stack usage and make KASAN happy NAND core changes: - Fix NAND_CMD_NONE handling in nand_command[_lp]() hooks - Introduce the ->exec_op() infrastructure - Rework NAND buffers handling - Fix ECC requirements for K9F4G08U0D - Fix nand_do_read_oob() to return the number of bitflips - Mark K9F1G08U0E as not supporting subpage writes NAND driver changes: - MTK: Rework the driver to support new IP versions - OMAP OneNAND: Full rework to use new APIs (libgpio, dmaengine) and fix DT support - Marvell: Add a new driver to replace the pxa3xx one SPI NOR core changes: - Add support to new ISSI and Cypress/Spansion memory parts. - Fix support of Micron memories by checking error bits in the FSR. - Fix update of block-protection bits by reading back the SR. - Restore the internal state of the SPI flash memory when removing the device. SPI NOR driver changes: - Maintenance for Freescale, Intel and Metiatek drivers. - Add support of the direct access mode for the Cadence QSPI controller" * tag 'mtd/for-4.16' of git://git.infradead.org/linux-mtd: (93 commits) mtd: nand: sunxi: Fix ECC strength choice mtd: nand: gpmi: Fix subpage reads mtd: nand: Fix build issues due to an anonymous union mtd: nand: marvell: Fix missing memory allocation modifier mtd: nand: marvell: remove redundant variable 'oob_len' mtd: nand: marvell: fix spelling mistake: "suceed"-> "succeed" mtd: onenand: omap2: Remove redundant dev_err call in omap2_onenand_probe() mtd: Remove duplicate checks on mtd_oob_ops parameter mtd: Fallback to ->_read/write_oob() when ->_read/write() is missing mtd: mtdpart: Make ECC stat handling consistent mtd: onenand: omap2: print resource using %pR format string mtd: mtk-nor: modify functions' name more generally mtd: onenand: samsung: remove incorrect __iomem annotation MAINTAINERS: Add entry for Marvell NAND controller driver ARM: OMAP2+: Remove gpmc-onenand mtd: onenand: omap2: Configure driver from DT mtd: onenand: omap2: Decouple DMA enabling from INT pin availability mtd: onenand: omap2: Do not make delay for GPIO OMAP3 specific mtd: onenand: omap2: Convert to use dmaengine for memcpy mtd: onenand: omap2: Unify OMAP2 and OMAP3 DMA implementation ...
1942 lines
51 KiB
C
1942 lines
51 KiB
C
/*
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* Core registration and callback routines for MTD
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* drivers and users.
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*
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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* Copyright © 2006 Red Hat UK Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/seq_file.h>
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#include <linux/string.h>
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#include <linux/timer.h>
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#include <linux/major.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include <linux/ioctl.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/proc_fs.h>
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#include <linux/idr.h>
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#include <linux/backing-dev.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/reboot.h>
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#include <linux/leds.h>
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#include <linux/debugfs.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include "mtdcore.h"
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struct backing_dev_info *mtd_bdi;
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#ifdef CONFIG_PM_SLEEP
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static int mtd_cls_suspend(struct device *dev)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return mtd ? mtd_suspend(mtd) : 0;
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}
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static int mtd_cls_resume(struct device *dev)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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if (mtd)
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mtd_resume(mtd);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(mtd_cls_pm_ops, mtd_cls_suspend, mtd_cls_resume);
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#define MTD_CLS_PM_OPS (&mtd_cls_pm_ops)
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#else
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#define MTD_CLS_PM_OPS NULL
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#endif
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static struct class mtd_class = {
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.name = "mtd",
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.owner = THIS_MODULE,
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.pm = MTD_CLS_PM_OPS,
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};
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static DEFINE_IDR(mtd_idr);
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/* These are exported solely for the purpose of mtd_blkdevs.c. You
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should not use them for _anything_ else */
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DEFINE_MUTEX(mtd_table_mutex);
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EXPORT_SYMBOL_GPL(mtd_table_mutex);
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struct mtd_info *__mtd_next_device(int i)
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{
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return idr_get_next(&mtd_idr, &i);
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}
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EXPORT_SYMBOL_GPL(__mtd_next_device);
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static LIST_HEAD(mtd_notifiers);
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#define MTD_DEVT(index) MKDEV(MTD_CHAR_MAJOR, (index)*2)
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/* REVISIT once MTD uses the driver model better, whoever allocates
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* the mtd_info will probably want to use the release() hook...
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*/
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static void mtd_release(struct device *dev)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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dev_t index = MTD_DEVT(mtd->index);
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/* remove /dev/mtdXro node */
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device_destroy(&mtd_class, index + 1);
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}
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static ssize_t mtd_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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char *type;
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switch (mtd->type) {
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case MTD_ABSENT:
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type = "absent";
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break;
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case MTD_RAM:
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type = "ram";
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break;
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case MTD_ROM:
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type = "rom";
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break;
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case MTD_NORFLASH:
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type = "nor";
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break;
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case MTD_NANDFLASH:
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type = "nand";
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break;
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case MTD_DATAFLASH:
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type = "dataflash";
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break;
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case MTD_UBIVOLUME:
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type = "ubi";
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break;
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case MTD_MLCNANDFLASH:
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type = "mlc-nand";
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break;
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default:
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type = "unknown";
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}
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return snprintf(buf, PAGE_SIZE, "%s\n", type);
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}
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static DEVICE_ATTR(type, S_IRUGO, mtd_type_show, NULL);
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static ssize_t mtd_flags_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "0x%lx\n", (unsigned long)mtd->flags);
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}
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static DEVICE_ATTR(flags, S_IRUGO, mtd_flags_show, NULL);
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static ssize_t mtd_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%llu\n",
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(unsigned long long)mtd->size);
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}
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static DEVICE_ATTR(size, S_IRUGO, mtd_size_show, NULL);
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static ssize_t mtd_erasesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->erasesize);
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}
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static DEVICE_ATTR(erasesize, S_IRUGO, mtd_erasesize_show, NULL);
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static ssize_t mtd_writesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->writesize);
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}
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static DEVICE_ATTR(writesize, S_IRUGO, mtd_writesize_show, NULL);
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static ssize_t mtd_subpagesize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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unsigned int subpagesize = mtd->writesize >> mtd->subpage_sft;
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return snprintf(buf, PAGE_SIZE, "%u\n", subpagesize);
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}
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static DEVICE_ATTR(subpagesize, S_IRUGO, mtd_subpagesize_show, NULL);
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static ssize_t mtd_oobsize_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%lu\n", (unsigned long)mtd->oobsize);
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}
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static DEVICE_ATTR(oobsize, S_IRUGO, mtd_oobsize_show, NULL);
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static ssize_t mtd_numeraseregions_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->numeraseregions);
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}
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static DEVICE_ATTR(numeraseregions, S_IRUGO, mtd_numeraseregions_show,
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NULL);
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static ssize_t mtd_name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%s\n", mtd->name);
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}
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static DEVICE_ATTR(name, S_IRUGO, mtd_name_show, NULL);
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static ssize_t mtd_ecc_strength_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_strength);
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}
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static DEVICE_ATTR(ecc_strength, S_IRUGO, mtd_ecc_strength_show, NULL);
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static ssize_t mtd_bitflip_threshold_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->bitflip_threshold);
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}
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static ssize_t mtd_bitflip_threshold_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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unsigned int bitflip_threshold;
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int retval;
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retval = kstrtouint(buf, 0, &bitflip_threshold);
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if (retval)
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return retval;
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mtd->bitflip_threshold = bitflip_threshold;
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return count;
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}
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static DEVICE_ATTR(bitflip_threshold, S_IRUGO | S_IWUSR,
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mtd_bitflip_threshold_show,
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mtd_bitflip_threshold_store);
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static ssize_t mtd_ecc_step_size_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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return snprintf(buf, PAGE_SIZE, "%u\n", mtd->ecc_step_size);
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}
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static DEVICE_ATTR(ecc_step_size, S_IRUGO, mtd_ecc_step_size_show, NULL);
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static ssize_t mtd_ecc_stats_corrected_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
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return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->corrected);
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}
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static DEVICE_ATTR(corrected_bits, S_IRUGO,
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mtd_ecc_stats_corrected_show, NULL);
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static ssize_t mtd_ecc_stats_errors_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
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return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->failed);
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}
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static DEVICE_ATTR(ecc_failures, S_IRUGO, mtd_ecc_stats_errors_show, NULL);
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static ssize_t mtd_badblocks_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
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return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->badblocks);
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}
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static DEVICE_ATTR(bad_blocks, S_IRUGO, mtd_badblocks_show, NULL);
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static ssize_t mtd_bbtblocks_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mtd_info *mtd = dev_get_drvdata(dev);
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struct mtd_ecc_stats *ecc_stats = &mtd->ecc_stats;
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return snprintf(buf, PAGE_SIZE, "%u\n", ecc_stats->bbtblocks);
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}
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static DEVICE_ATTR(bbt_blocks, S_IRUGO, mtd_bbtblocks_show, NULL);
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static struct attribute *mtd_attrs[] = {
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&dev_attr_type.attr,
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&dev_attr_flags.attr,
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&dev_attr_size.attr,
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&dev_attr_erasesize.attr,
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&dev_attr_writesize.attr,
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&dev_attr_subpagesize.attr,
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&dev_attr_oobsize.attr,
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&dev_attr_numeraseregions.attr,
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&dev_attr_name.attr,
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&dev_attr_ecc_strength.attr,
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&dev_attr_ecc_step_size.attr,
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&dev_attr_corrected_bits.attr,
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&dev_attr_ecc_failures.attr,
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&dev_attr_bad_blocks.attr,
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&dev_attr_bbt_blocks.attr,
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&dev_attr_bitflip_threshold.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(mtd);
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static const struct device_type mtd_devtype = {
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.name = "mtd",
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.groups = mtd_groups,
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.release = mtd_release,
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};
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#ifndef CONFIG_MMU
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unsigned mtd_mmap_capabilities(struct mtd_info *mtd)
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{
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switch (mtd->type) {
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case MTD_RAM:
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return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC |
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NOMMU_MAP_READ | NOMMU_MAP_WRITE;
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case MTD_ROM:
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return NOMMU_MAP_COPY | NOMMU_MAP_DIRECT | NOMMU_MAP_EXEC |
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NOMMU_MAP_READ;
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default:
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return NOMMU_MAP_COPY;
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}
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}
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EXPORT_SYMBOL_GPL(mtd_mmap_capabilities);
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#endif
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static int mtd_reboot_notifier(struct notifier_block *n, unsigned long state,
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void *cmd)
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{
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struct mtd_info *mtd;
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mtd = container_of(n, struct mtd_info, reboot_notifier);
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mtd->_reboot(mtd);
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return NOTIFY_DONE;
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}
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/**
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* mtd_wunit_to_pairing_info - get pairing information of a wunit
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* @mtd: pointer to new MTD device info structure
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* @wunit: write unit we are interested in
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* @info: returned pairing information
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*
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* Retrieve pairing information associated to the wunit.
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* This is mainly useful when dealing with MLC/TLC NANDs where pages can be
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* paired together, and where programming a page may influence the page it is
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* paired with.
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* The notion of page is replaced by the term wunit (write-unit) to stay
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* consistent with the ->writesize field.
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|
*
|
|
* The @wunit argument can be extracted from an absolute offset using
|
|
* mtd_offset_to_wunit(). @info is filled with the pairing information attached
|
|
* to @wunit.
|
|
*
|
|
* From the pairing info the MTD user can find all the wunits paired with
|
|
* @wunit using the following loop:
|
|
*
|
|
* for (i = 0; i < mtd_pairing_groups(mtd); i++) {
|
|
* info.pair = i;
|
|
* mtd_pairing_info_to_wunit(mtd, &info);
|
|
* ...
|
|
* }
|
|
*/
|
|
int mtd_wunit_to_pairing_info(struct mtd_info *mtd, int wunit,
|
|
struct mtd_pairing_info *info)
|
|
{
|
|
int npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd);
|
|
|
|
if (wunit < 0 || wunit >= npairs)
|
|
return -EINVAL;
|
|
|
|
if (mtd->pairing && mtd->pairing->get_info)
|
|
return mtd->pairing->get_info(mtd, wunit, info);
|
|
|
|
info->group = 0;
|
|
info->pair = wunit;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_wunit_to_pairing_info);
|
|
|
|
/**
|
|
* mtd_wunit_to_pairing_info - get wunit from pairing information
|
|
* @mtd: pointer to new MTD device info structure
|
|
* @info: pairing information struct
|
|
*
|
|
* Returns a positive number representing the wunit associated to the info
|
|
* struct, or a negative error code.
|
|
*
|
|
* This is the reverse of mtd_wunit_to_pairing_info(), and can help one to
|
|
* iterate over all wunits of a given pair (see mtd_wunit_to_pairing_info()
|
|
* doc).
|
|
*
|
|
* It can also be used to only program the first page of each pair (i.e.
|
|
* page attached to group 0), which allows one to use an MLC NAND in
|
|
* software-emulated SLC mode:
|
|
*
|
|
* info.group = 0;
|
|
* npairs = mtd_wunit_per_eb(mtd) / mtd_pairing_groups(mtd);
|
|
* for (info.pair = 0; info.pair < npairs; info.pair++) {
|
|
* wunit = mtd_pairing_info_to_wunit(mtd, &info);
|
|
* mtd_write(mtd, mtd_wunit_to_offset(mtd, blkoffs, wunit),
|
|
* mtd->writesize, &retlen, buf + (i * mtd->writesize));
|
|
* }
|
|
*/
|
|
int mtd_pairing_info_to_wunit(struct mtd_info *mtd,
|
|
const struct mtd_pairing_info *info)
|
|
{
|
|
int ngroups = mtd_pairing_groups(mtd);
|
|
int npairs = mtd_wunit_per_eb(mtd) / ngroups;
|
|
|
|
if (!info || info->pair < 0 || info->pair >= npairs ||
|
|
info->group < 0 || info->group >= ngroups)
|
|
return -EINVAL;
|
|
|
|
if (mtd->pairing && mtd->pairing->get_wunit)
|
|
return mtd->pairing->get_wunit(mtd, info);
|
|
|
|
return info->pair;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_pairing_info_to_wunit);
|
|
|
|
/**
|
|
* mtd_pairing_groups - get the number of pairing groups
|
|
* @mtd: pointer to new MTD device info structure
|
|
*
|
|
* Returns the number of pairing groups.
|
|
*
|
|
* This number is usually equal to the number of bits exposed by a single
|
|
* cell, and can be used in conjunction with mtd_pairing_info_to_wunit()
|
|
* to iterate over all pages of a given pair.
|
|
*/
|
|
int mtd_pairing_groups(struct mtd_info *mtd)
|
|
{
|
|
if (!mtd->pairing || !mtd->pairing->ngroups)
|
|
return 1;
|
|
|
|
return mtd->pairing->ngroups;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_pairing_groups);
|
|
|
|
static struct dentry *dfs_dir_mtd;
|
|
|
|
/**
|
|
* add_mtd_device - register an MTD device
|
|
* @mtd: pointer to new MTD device info structure
|
|
*
|
|
* Add a device to the list of MTD devices present in the system, and
|
|
* notify each currently active MTD 'user' of its arrival. Returns
|
|
* zero on success or non-zero on failure.
|
|
*/
|
|
|
|
int add_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
struct mtd_notifier *not;
|
|
int i, error;
|
|
|
|
/*
|
|
* May occur, for instance, on buggy drivers which call
|
|
* mtd_device_parse_register() multiple times on the same master MTD,
|
|
* especially with CONFIG_MTD_PARTITIONED_MASTER=y.
|
|
*/
|
|
if (WARN_ONCE(mtd->dev.type, "MTD already registered\n"))
|
|
return -EEXIST;
|
|
|
|
BUG_ON(mtd->writesize == 0);
|
|
|
|
if (WARN_ON((!mtd->erasesize || !mtd->_erase) &&
|
|
!(mtd->flags & MTD_NO_ERASE)))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
i = idr_alloc(&mtd_idr, mtd, 0, 0, GFP_KERNEL);
|
|
if (i < 0) {
|
|
error = i;
|
|
goto fail_locked;
|
|
}
|
|
|
|
mtd->index = i;
|
|
mtd->usecount = 0;
|
|
|
|
/* default value if not set by driver */
|
|
if (mtd->bitflip_threshold == 0)
|
|
mtd->bitflip_threshold = mtd->ecc_strength;
|
|
|
|
if (is_power_of_2(mtd->erasesize))
|
|
mtd->erasesize_shift = ffs(mtd->erasesize) - 1;
|
|
else
|
|
mtd->erasesize_shift = 0;
|
|
|
|
if (is_power_of_2(mtd->writesize))
|
|
mtd->writesize_shift = ffs(mtd->writesize) - 1;
|
|
else
|
|
mtd->writesize_shift = 0;
|
|
|
|
mtd->erasesize_mask = (1 << mtd->erasesize_shift) - 1;
|
|
mtd->writesize_mask = (1 << mtd->writesize_shift) - 1;
|
|
|
|
/* Some chips always power up locked. Unlock them now */
|
|
if ((mtd->flags & MTD_WRITEABLE) && (mtd->flags & MTD_POWERUP_LOCK)) {
|
|
error = mtd_unlock(mtd, 0, mtd->size);
|
|
if (error && error != -EOPNOTSUPP)
|
|
printk(KERN_WARNING
|
|
"%s: unlock failed, writes may not work\n",
|
|
mtd->name);
|
|
/* Ignore unlock failures? */
|
|
error = 0;
|
|
}
|
|
|
|
/* Caller should have set dev.parent to match the
|
|
* physical device, if appropriate.
|
|
*/
|
|
mtd->dev.type = &mtd_devtype;
|
|
mtd->dev.class = &mtd_class;
|
|
mtd->dev.devt = MTD_DEVT(i);
|
|
dev_set_name(&mtd->dev, "mtd%d", i);
|
|
dev_set_drvdata(&mtd->dev, mtd);
|
|
of_node_get(mtd_get_of_node(mtd));
|
|
error = device_register(&mtd->dev);
|
|
if (error)
|
|
goto fail_added;
|
|
|
|
if (!IS_ERR_OR_NULL(dfs_dir_mtd)) {
|
|
mtd->dbg.dfs_dir = debugfs_create_dir(dev_name(&mtd->dev), dfs_dir_mtd);
|
|
if (IS_ERR_OR_NULL(mtd->dbg.dfs_dir)) {
|
|
pr_debug("mtd device %s won't show data in debugfs\n",
|
|
dev_name(&mtd->dev));
|
|
}
|
|
}
|
|
|
|
device_create(&mtd_class, mtd->dev.parent, MTD_DEVT(i) + 1, NULL,
|
|
"mtd%dro", i);
|
|
|
|
pr_debug("mtd: Giving out device %d to %s\n", i, mtd->name);
|
|
/* No need to get a refcount on the module containing
|
|
the notifier, since we hold the mtd_table_mutex */
|
|
list_for_each_entry(not, &mtd_notifiers, list)
|
|
not->add(mtd);
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
/* We _know_ we aren't being removed, because
|
|
our caller is still holding us here. So none
|
|
of this try_ nonsense, and no bitching about it
|
|
either. :) */
|
|
__module_get(THIS_MODULE);
|
|
return 0;
|
|
|
|
fail_added:
|
|
of_node_put(mtd_get_of_node(mtd));
|
|
idr_remove(&mtd_idr, i);
|
|
fail_locked:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* del_mtd_device - unregister an MTD device
|
|
* @mtd: pointer to MTD device info structure
|
|
*
|
|
* Remove a device from the list of MTD devices present in the system,
|
|
* and notify each currently active MTD 'user' of its departure.
|
|
* Returns zero on success or 1 on failure, which currently will happen
|
|
* if the requested device does not appear to be present in the list.
|
|
*/
|
|
|
|
int del_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
int ret;
|
|
struct mtd_notifier *not;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
debugfs_remove_recursive(mtd->dbg.dfs_dir);
|
|
|
|
if (idr_find(&mtd_idr, mtd->index) != mtd) {
|
|
ret = -ENODEV;
|
|
goto out_error;
|
|
}
|
|
|
|
/* No need to get a refcount on the module containing
|
|
the notifier, since we hold the mtd_table_mutex */
|
|
list_for_each_entry(not, &mtd_notifiers, list)
|
|
not->remove(mtd);
|
|
|
|
if (mtd->usecount) {
|
|
printk(KERN_NOTICE "Removing MTD device #%d (%s) with use count %d\n",
|
|
mtd->index, mtd->name, mtd->usecount);
|
|
ret = -EBUSY;
|
|
} else {
|
|
device_unregister(&mtd->dev);
|
|
|
|
idr_remove(&mtd_idr, mtd->index);
|
|
of_node_put(mtd_get_of_node(mtd));
|
|
|
|
module_put(THIS_MODULE);
|
|
ret = 0;
|
|
}
|
|
|
|
out_error:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static int mtd_add_device_partitions(struct mtd_info *mtd,
|
|
struct mtd_partitions *parts)
|
|
{
|
|
const struct mtd_partition *real_parts = parts->parts;
|
|
int nbparts = parts->nr_parts;
|
|
int ret;
|
|
|
|
if (nbparts == 0 || IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) {
|
|
ret = add_mtd_device(mtd);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (nbparts > 0) {
|
|
ret = add_mtd_partitions(mtd, real_parts, nbparts);
|
|
if (ret && IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER))
|
|
del_mtd_device(mtd);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set a few defaults based on the parent devices, if not provided by the
|
|
* driver
|
|
*/
|
|
static void mtd_set_dev_defaults(struct mtd_info *mtd)
|
|
{
|
|
if (mtd->dev.parent) {
|
|
if (!mtd->owner && mtd->dev.parent->driver)
|
|
mtd->owner = mtd->dev.parent->driver->owner;
|
|
if (!mtd->name)
|
|
mtd->name = dev_name(mtd->dev.parent);
|
|
} else {
|
|
pr_debug("mtd device won't show a device symlink in sysfs\n");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mtd_device_parse_register - parse partitions and register an MTD device.
|
|
*
|
|
* @mtd: the MTD device to register
|
|
* @types: the list of MTD partition probes to try, see
|
|
* 'parse_mtd_partitions()' for more information
|
|
* @parser_data: MTD partition parser-specific data
|
|
* @parts: fallback partition information to register, if parsing fails;
|
|
* only valid if %nr_parts > %0
|
|
* @nr_parts: the number of partitions in parts, if zero then the full
|
|
* MTD device is registered if no partition info is found
|
|
*
|
|
* This function aggregates MTD partitions parsing (done by
|
|
* 'parse_mtd_partitions()') and MTD device and partitions registering. It
|
|
* basically follows the most common pattern found in many MTD drivers:
|
|
*
|
|
* * It first tries to probe partitions on MTD device @mtd using parsers
|
|
* specified in @types (if @types is %NULL, then the default list of parsers
|
|
* is used, see 'parse_mtd_partitions()' for more information). If none are
|
|
* found this functions tries to fallback to information specified in
|
|
* @parts/@nr_parts.
|
|
* * If any partitioning info was found, this function registers the found
|
|
* partitions. If the MTD_PARTITIONED_MASTER option is set, then the device
|
|
* as a whole is registered first.
|
|
* * If no partitions were found this function just registers the MTD device
|
|
* @mtd and exits.
|
|
*
|
|
* Returns zero in case of success and a negative error code in case of failure.
|
|
*/
|
|
int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
|
|
struct mtd_part_parser_data *parser_data,
|
|
const struct mtd_partition *parts,
|
|
int nr_parts)
|
|
{
|
|
struct mtd_partitions parsed;
|
|
int ret;
|
|
|
|
mtd_set_dev_defaults(mtd);
|
|
|
|
memset(&parsed, 0, sizeof(parsed));
|
|
|
|
ret = parse_mtd_partitions(mtd, types, &parsed, parser_data);
|
|
if ((ret < 0 || parsed.nr_parts == 0) && parts && nr_parts) {
|
|
/* Fall back to driver-provided partitions */
|
|
parsed = (struct mtd_partitions){
|
|
.parts = parts,
|
|
.nr_parts = nr_parts,
|
|
};
|
|
} else if (ret < 0) {
|
|
/* Didn't come up with parsed OR fallback partitions */
|
|
pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d)\n",
|
|
ret);
|
|
/* Don't abort on errors; we can still use unpartitioned MTD */
|
|
memset(&parsed, 0, sizeof(parsed));
|
|
}
|
|
|
|
ret = mtd_add_device_partitions(mtd, &parsed);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* FIXME: some drivers unfortunately call this function more than once.
|
|
* So we have to check if we've already assigned the reboot notifier.
|
|
*
|
|
* Generally, we can make multiple calls work for most cases, but it
|
|
* does cause problems with parse_mtd_partitions() above (e.g.,
|
|
* cmdlineparts will register partitions more than once).
|
|
*/
|
|
WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call,
|
|
"MTD already registered\n");
|
|
if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) {
|
|
mtd->reboot_notifier.notifier_call = mtd_reboot_notifier;
|
|
register_reboot_notifier(&mtd->reboot_notifier);
|
|
}
|
|
|
|
out:
|
|
/* Cleanup any parsed partitions */
|
|
mtd_part_parser_cleanup(&parsed);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_device_parse_register);
|
|
|
|
/**
|
|
* mtd_device_unregister - unregister an existing MTD device.
|
|
*
|
|
* @master: the MTD device to unregister. This will unregister both the master
|
|
* and any partitions if registered.
|
|
*/
|
|
int mtd_device_unregister(struct mtd_info *master)
|
|
{
|
|
int err;
|
|
|
|
if (master->_reboot)
|
|
unregister_reboot_notifier(&master->reboot_notifier);
|
|
|
|
err = del_mtd_partitions(master);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!device_is_registered(&master->dev))
|
|
return 0;
|
|
|
|
return del_mtd_device(master);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_device_unregister);
|
|
|
|
/**
|
|
* register_mtd_user - register a 'user' of MTD devices.
|
|
* @new: pointer to notifier info structure
|
|
*
|
|
* Registers a pair of callbacks function to be called upon addition
|
|
* or removal of MTD devices. Causes the 'add' callback to be immediately
|
|
* invoked for each MTD device currently present in the system.
|
|
*/
|
|
void register_mtd_user (struct mtd_notifier *new)
|
|
{
|
|
struct mtd_info *mtd;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
list_add(&new->list, &mtd_notifiers);
|
|
|
|
__module_get(THIS_MODULE);
|
|
|
|
mtd_for_each_device(mtd)
|
|
new->add(mtd);
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(register_mtd_user);
|
|
|
|
/**
|
|
* unregister_mtd_user - unregister a 'user' of MTD devices.
|
|
* @old: pointer to notifier info structure
|
|
*
|
|
* Removes a callback function pair from the list of 'users' to be
|
|
* notified upon addition or removal of MTD devices. Causes the
|
|
* 'remove' callback to be immediately invoked for each MTD device
|
|
* currently present in the system.
|
|
*/
|
|
int unregister_mtd_user (struct mtd_notifier *old)
|
|
{
|
|
struct mtd_info *mtd;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
module_put(THIS_MODULE);
|
|
|
|
mtd_for_each_device(mtd)
|
|
old->remove(mtd);
|
|
|
|
list_del(&old->list);
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(unregister_mtd_user);
|
|
|
|
/**
|
|
* get_mtd_device - obtain a validated handle for an MTD device
|
|
* @mtd: last known address of the required MTD device
|
|
* @num: internal device number of the required MTD device
|
|
*
|
|
* Given a number and NULL address, return the num'th entry in the device
|
|
* table, if any. Given an address and num == -1, search the device table
|
|
* for a device with that address and return if it's still present. Given
|
|
* both, return the num'th driver only if its address matches. Return
|
|
* error code if not.
|
|
*/
|
|
struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
|
|
{
|
|
struct mtd_info *ret = NULL, *other;
|
|
int err = -ENODEV;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
if (num == -1) {
|
|
mtd_for_each_device(other) {
|
|
if (other == mtd) {
|
|
ret = mtd;
|
|
break;
|
|
}
|
|
}
|
|
} else if (num >= 0) {
|
|
ret = idr_find(&mtd_idr, num);
|
|
if (mtd && mtd != ret)
|
|
ret = NULL;
|
|
}
|
|
|
|
if (!ret) {
|
|
ret = ERR_PTR(err);
|
|
goto out;
|
|
}
|
|
|
|
err = __get_mtd_device(ret);
|
|
if (err)
|
|
ret = ERR_PTR(err);
|
|
out:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_mtd_device);
|
|
|
|
|
|
int __get_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
int err;
|
|
|
|
if (!try_module_get(mtd->owner))
|
|
return -ENODEV;
|
|
|
|
if (mtd->_get_device) {
|
|
err = mtd->_get_device(mtd);
|
|
|
|
if (err) {
|
|
module_put(mtd->owner);
|
|
return err;
|
|
}
|
|
}
|
|
mtd->usecount++;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__get_mtd_device);
|
|
|
|
/**
|
|
* get_mtd_device_nm - obtain a validated handle for an MTD device by
|
|
* device name
|
|
* @name: MTD device name to open
|
|
*
|
|
* This function returns MTD device description structure in case of
|
|
* success and an error code in case of failure.
|
|
*/
|
|
struct mtd_info *get_mtd_device_nm(const char *name)
|
|
{
|
|
int err = -ENODEV;
|
|
struct mtd_info *mtd = NULL, *other;
|
|
|
|
mutex_lock(&mtd_table_mutex);
|
|
|
|
mtd_for_each_device(other) {
|
|
if (!strcmp(name, other->name)) {
|
|
mtd = other;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!mtd)
|
|
goto out_unlock;
|
|
|
|
err = __get_mtd_device(mtd);
|
|
if (err)
|
|
goto out_unlock;
|
|
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return mtd;
|
|
|
|
out_unlock:
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(get_mtd_device_nm);
|
|
|
|
void put_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
mutex_lock(&mtd_table_mutex);
|
|
__put_mtd_device(mtd);
|
|
mutex_unlock(&mtd_table_mutex);
|
|
|
|
}
|
|
EXPORT_SYMBOL_GPL(put_mtd_device);
|
|
|
|
void __put_mtd_device(struct mtd_info *mtd)
|
|
{
|
|
--mtd->usecount;
|
|
BUG_ON(mtd->usecount < 0);
|
|
|
|
if (mtd->_put_device)
|
|
mtd->_put_device(mtd);
|
|
|
|
module_put(mtd->owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(__put_mtd_device);
|
|
|
|
/*
|
|
* Erase is an asynchronous operation. Device drivers are supposed
|
|
* to call instr->callback() whenever the operation completes, even
|
|
* if it completes with a failure.
|
|
* Callers are supposed to pass a callback function and wait for it
|
|
* to be called before writing to the block.
|
|
*/
|
|
int mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
|
|
{
|
|
if (instr->addr >= mtd->size || instr->len > mtd->size - instr->addr)
|
|
return -EINVAL;
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
|
|
if (!instr->len) {
|
|
instr->state = MTD_ERASE_DONE;
|
|
mtd_erase_callback(instr);
|
|
return 0;
|
|
}
|
|
ledtrig_mtd_activity();
|
|
return mtd->_erase(mtd, instr);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_erase);
|
|
|
|
/*
|
|
* This stuff for eXecute-In-Place. phys is optional and may be set to NULL.
|
|
*/
|
|
int mtd_point(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
|
|
void **virt, resource_size_t *phys)
|
|
{
|
|
*retlen = 0;
|
|
*virt = NULL;
|
|
if (phys)
|
|
*phys = 0;
|
|
if (!mtd->_point)
|
|
return -EOPNOTSUPP;
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_point(mtd, from, len, retlen, virt, phys);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_point);
|
|
|
|
/* We probably shouldn't allow XIP if the unpoint isn't a NULL */
|
|
int mtd_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
|
|
{
|
|
if (!mtd->_unpoint)
|
|
return -EOPNOTSUPP;
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_unpoint(mtd, from, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_unpoint);
|
|
|
|
/*
|
|
* Allow NOMMU mmap() to directly map the device (if not NULL)
|
|
* - return the address to which the offset maps
|
|
* - return -ENOSYS to indicate refusal to do the mapping
|
|
*/
|
|
unsigned long mtd_get_unmapped_area(struct mtd_info *mtd, unsigned long len,
|
|
unsigned long offset, unsigned long flags)
|
|
{
|
|
size_t retlen;
|
|
void *virt;
|
|
int ret;
|
|
|
|
ret = mtd_point(mtd, offset, len, &retlen, &virt, NULL);
|
|
if (ret)
|
|
return ret;
|
|
if (retlen != len) {
|
|
mtd_unpoint(mtd, offset, retlen);
|
|
return -ENOSYS;
|
|
}
|
|
return (unsigned long)virt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_unmapped_area);
|
|
|
|
int mtd_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen,
|
|
u_char *buf)
|
|
{
|
|
int ret_code;
|
|
*retlen = 0;
|
|
if (from < 0 || from >= mtd->size || len > mtd->size - from)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
|
|
ledtrig_mtd_activity();
|
|
/*
|
|
* In the absence of an error, drivers return a non-negative integer
|
|
* representing the maximum number of bitflips that were corrected on
|
|
* any one ecc region (if applicable; zero otherwise).
|
|
*/
|
|
if (mtd->_read) {
|
|
ret_code = mtd->_read(mtd, from, len, retlen, buf);
|
|
} else if (mtd->_read_oob) {
|
|
struct mtd_oob_ops ops = {
|
|
.len = len,
|
|
.datbuf = buf,
|
|
};
|
|
|
|
ret_code = mtd->_read_oob(mtd, from, &ops);
|
|
*retlen = ops.retlen;
|
|
} else {
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
if (unlikely(ret_code < 0))
|
|
return ret_code;
|
|
if (mtd->ecc_strength == 0)
|
|
return 0; /* device lacks ecc */
|
|
return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_read);
|
|
|
|
int mtd_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
|
|
const u_char *buf)
|
|
{
|
|
*retlen = 0;
|
|
if (to < 0 || to >= mtd->size || len > mtd->size - to)
|
|
return -EINVAL;
|
|
if ((!mtd->_write && !mtd->_write_oob) ||
|
|
!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
if (!len)
|
|
return 0;
|
|
ledtrig_mtd_activity();
|
|
|
|
if (!mtd->_write) {
|
|
struct mtd_oob_ops ops = {
|
|
.len = len,
|
|
.datbuf = (u8 *)buf,
|
|
};
|
|
int ret;
|
|
|
|
ret = mtd->_write_oob(mtd, to, &ops);
|
|
*retlen = ops.retlen;
|
|
return ret;
|
|
}
|
|
|
|
return mtd->_write(mtd, to, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_write);
|
|
|
|
/*
|
|
* In blackbox flight recorder like scenarios we want to make successful writes
|
|
* in interrupt context. panic_write() is only intended to be called when its
|
|
* known the kernel is about to panic and we need the write to succeed. Since
|
|
* the kernel is not going to be running for much longer, this function can
|
|
* break locks and delay to ensure the write succeeds (but not sleep).
|
|
*/
|
|
int mtd_panic_write(struct mtd_info *mtd, loff_t to, size_t len, size_t *retlen,
|
|
const u_char *buf)
|
|
{
|
|
*retlen = 0;
|
|
if (!mtd->_panic_write)
|
|
return -EOPNOTSUPP;
|
|
if (to < 0 || to >= mtd->size || len > mtd->size - to)
|
|
return -EINVAL;
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_panic_write(mtd, to, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_panic_write);
|
|
|
|
static int mtd_check_oob_ops(struct mtd_info *mtd, loff_t offs,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
/*
|
|
* Some users are setting ->datbuf or ->oobbuf to NULL, but are leaving
|
|
* ->len or ->ooblen uninitialized. Force ->len and ->ooblen to 0 in
|
|
* this case.
|
|
*/
|
|
if (!ops->datbuf)
|
|
ops->len = 0;
|
|
|
|
if (!ops->oobbuf)
|
|
ops->ooblen = 0;
|
|
|
|
if (offs < 0 || offs + ops->len > mtd->size)
|
|
return -EINVAL;
|
|
|
|
if (ops->ooblen) {
|
|
u64 maxooblen;
|
|
|
|
if (ops->ooboffs >= mtd_oobavail(mtd, ops))
|
|
return -EINVAL;
|
|
|
|
maxooblen = ((mtd_div_by_ws(mtd->size, mtd) -
|
|
mtd_div_by_ws(offs, mtd)) *
|
|
mtd_oobavail(mtd, ops)) - ops->ooboffs;
|
|
if (ops->ooblen > maxooblen)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
|
|
{
|
|
int ret_code;
|
|
ops->retlen = ops->oobretlen = 0;
|
|
if (!mtd->_read_oob)
|
|
return -EOPNOTSUPP;
|
|
|
|
ret_code = mtd_check_oob_ops(mtd, from, ops);
|
|
if (ret_code)
|
|
return ret_code;
|
|
|
|
ledtrig_mtd_activity();
|
|
/*
|
|
* In cases where ops->datbuf != NULL, mtd->_read_oob() has semantics
|
|
* similar to mtd->_read(), returning a non-negative integer
|
|
* representing max bitflips. In other cases, mtd->_read_oob() may
|
|
* return -EUCLEAN. In all cases, perform similar logic to mtd_read().
|
|
*/
|
|
ret_code = mtd->_read_oob(mtd, from, ops);
|
|
if (unlikely(ret_code < 0))
|
|
return ret_code;
|
|
if (mtd->ecc_strength == 0)
|
|
return 0; /* device lacks ecc */
|
|
return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_read_oob);
|
|
|
|
int mtd_write_oob(struct mtd_info *mtd, loff_t to,
|
|
struct mtd_oob_ops *ops)
|
|
{
|
|
int ret;
|
|
|
|
ops->retlen = ops->oobretlen = 0;
|
|
if (!mtd->_write_oob)
|
|
return -EOPNOTSUPP;
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
|
|
ret = mtd_check_oob_ops(mtd, to, ops);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ledtrig_mtd_activity();
|
|
return mtd->_write_oob(mtd, to, ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_write_oob);
|
|
|
|
/**
|
|
* mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
|
|
* @mtd: MTD device structure
|
|
* @section: ECC section. Depending on the layout you may have all the ECC
|
|
* bytes stored in a single contiguous section, or one section
|
|
* per ECC chunk (and sometime several sections for a single ECC
|
|
* ECC chunk)
|
|
* @oobecc: OOB region struct filled with the appropriate ECC position
|
|
* information
|
|
*
|
|
* This function returns ECC section information in the OOB area. If you want
|
|
* to get all the ECC bytes information, then you should call
|
|
* mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
|
|
struct mtd_oob_region *oobecc)
|
|
{
|
|
memset(oobecc, 0, sizeof(*oobecc));
|
|
|
|
if (!mtd || section < 0)
|
|
return -EINVAL;
|
|
|
|
if (!mtd->ooblayout || !mtd->ooblayout->ecc)
|
|
return -ENOTSUPP;
|
|
|
|
return mtd->ooblayout->ecc(mtd, section, oobecc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
|
|
|
|
/**
|
|
* mtd_ooblayout_free - Get the OOB region definition of a specific free
|
|
* section
|
|
* @mtd: MTD device structure
|
|
* @section: Free section you are interested in. Depending on the layout
|
|
* you may have all the free bytes stored in a single contiguous
|
|
* section, or one section per ECC chunk plus an extra section
|
|
* for the remaining bytes (or other funky layout).
|
|
* @oobfree: OOB region struct filled with the appropriate free position
|
|
* information
|
|
*
|
|
* This function returns free bytes position in the OOB area. If you want
|
|
* to get all the free bytes information, then you should call
|
|
* mtd_ooblayout_free(mtd, section++, oobfree) until it returns -ERANGE.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_free(struct mtd_info *mtd, int section,
|
|
struct mtd_oob_region *oobfree)
|
|
{
|
|
memset(oobfree, 0, sizeof(*oobfree));
|
|
|
|
if (!mtd || section < 0)
|
|
return -EINVAL;
|
|
|
|
if (!mtd->ooblayout || !mtd->ooblayout->free)
|
|
return -ENOTSUPP;
|
|
|
|
return mtd->ooblayout->free(mtd, section, oobfree);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_free);
|
|
|
|
/**
|
|
* mtd_ooblayout_find_region - Find the region attached to a specific byte
|
|
* @mtd: mtd info structure
|
|
* @byte: the byte we are searching for
|
|
* @sectionp: pointer where the section id will be stored
|
|
* @oobregion: used to retrieve the ECC position
|
|
* @iter: iterator function. Should be either mtd_ooblayout_free or
|
|
* mtd_ooblayout_ecc depending on the region type you're searching for
|
|
*
|
|
* This function returns the section id and oobregion information of a
|
|
* specific byte. For example, say you want to know where the 4th ECC byte is
|
|
* stored, you'll use:
|
|
*
|
|
* mtd_ooblayout_find_region(mtd, 3, §ion, &oobregion, mtd_ooblayout_ecc);
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
static int mtd_ooblayout_find_region(struct mtd_info *mtd, int byte,
|
|
int *sectionp, struct mtd_oob_region *oobregion,
|
|
int (*iter)(struct mtd_info *,
|
|
int section,
|
|
struct mtd_oob_region *oobregion))
|
|
{
|
|
int pos = 0, ret, section = 0;
|
|
|
|
memset(oobregion, 0, sizeof(*oobregion));
|
|
|
|
while (1) {
|
|
ret = iter(mtd, section, oobregion);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (pos + oobregion->length > byte)
|
|
break;
|
|
|
|
pos += oobregion->length;
|
|
section++;
|
|
}
|
|
|
|
/*
|
|
* Adjust region info to make it start at the beginning at the
|
|
* 'start' ECC byte.
|
|
*/
|
|
oobregion->offset += byte - pos;
|
|
oobregion->length -= byte - pos;
|
|
*sectionp = section;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mtd_ooblayout_find_eccregion - Find the ECC region attached to a specific
|
|
* ECC byte
|
|
* @mtd: mtd info structure
|
|
* @eccbyte: the byte we are searching for
|
|
* @sectionp: pointer where the section id will be stored
|
|
* @oobregion: OOB region information
|
|
*
|
|
* Works like mtd_ooblayout_find_region() except it searches for a specific ECC
|
|
* byte.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_find_eccregion(struct mtd_info *mtd, int eccbyte,
|
|
int *section,
|
|
struct mtd_oob_region *oobregion)
|
|
{
|
|
return mtd_ooblayout_find_region(mtd, eccbyte, section, oobregion,
|
|
mtd_ooblayout_ecc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_find_eccregion);
|
|
|
|
/**
|
|
* mtd_ooblayout_get_bytes - Extract OOB bytes from the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @buf: destination buffer to store OOB bytes
|
|
* @oobbuf: OOB buffer
|
|
* @start: first byte to retrieve
|
|
* @nbytes: number of bytes to retrieve
|
|
* @iter: section iterator
|
|
*
|
|
* Extract bytes attached to a specific category (ECC or free)
|
|
* from the OOB buffer and copy them into buf.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
static int mtd_ooblayout_get_bytes(struct mtd_info *mtd, u8 *buf,
|
|
const u8 *oobbuf, int start, int nbytes,
|
|
int (*iter)(struct mtd_info *,
|
|
int section,
|
|
struct mtd_oob_region *oobregion))
|
|
{
|
|
struct mtd_oob_region oobregion;
|
|
int section, ret;
|
|
|
|
ret = mtd_ooblayout_find_region(mtd, start, §ion,
|
|
&oobregion, iter);
|
|
|
|
while (!ret) {
|
|
int cnt;
|
|
|
|
cnt = min_t(int, nbytes, oobregion.length);
|
|
memcpy(buf, oobbuf + oobregion.offset, cnt);
|
|
buf += cnt;
|
|
nbytes -= cnt;
|
|
|
|
if (!nbytes)
|
|
break;
|
|
|
|
ret = iter(mtd, ++section, &oobregion);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mtd_ooblayout_set_bytes - put OOB bytes into the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @buf: source buffer to get OOB bytes from
|
|
* @oobbuf: OOB buffer
|
|
* @start: first OOB byte to set
|
|
* @nbytes: number of OOB bytes to set
|
|
* @iter: section iterator
|
|
*
|
|
* Fill the OOB buffer with data provided in buf. The category (ECC or free)
|
|
* is selected by passing the appropriate iterator.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
static int mtd_ooblayout_set_bytes(struct mtd_info *mtd, const u8 *buf,
|
|
u8 *oobbuf, int start, int nbytes,
|
|
int (*iter)(struct mtd_info *,
|
|
int section,
|
|
struct mtd_oob_region *oobregion))
|
|
{
|
|
struct mtd_oob_region oobregion;
|
|
int section, ret;
|
|
|
|
ret = mtd_ooblayout_find_region(mtd, start, §ion,
|
|
&oobregion, iter);
|
|
|
|
while (!ret) {
|
|
int cnt;
|
|
|
|
cnt = min_t(int, nbytes, oobregion.length);
|
|
memcpy(oobbuf + oobregion.offset, buf, cnt);
|
|
buf += cnt;
|
|
nbytes -= cnt;
|
|
|
|
if (!nbytes)
|
|
break;
|
|
|
|
ret = iter(mtd, ++section, &oobregion);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mtd_ooblayout_count_bytes - count the number of bytes in a OOB category
|
|
* @mtd: mtd info structure
|
|
* @iter: category iterator
|
|
*
|
|
* Count the number of bytes in a given category.
|
|
*
|
|
* Returns a positive value on success, a negative error code otherwise.
|
|
*/
|
|
static int mtd_ooblayout_count_bytes(struct mtd_info *mtd,
|
|
int (*iter)(struct mtd_info *,
|
|
int section,
|
|
struct mtd_oob_region *oobregion))
|
|
{
|
|
struct mtd_oob_region oobregion;
|
|
int section = 0, ret, nbytes = 0;
|
|
|
|
while (1) {
|
|
ret = iter(mtd, section++, &oobregion);
|
|
if (ret) {
|
|
if (ret == -ERANGE)
|
|
ret = nbytes;
|
|
break;
|
|
}
|
|
|
|
nbytes += oobregion.length;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mtd_ooblayout_get_eccbytes - extract ECC bytes from the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @eccbuf: destination buffer to store ECC bytes
|
|
* @oobbuf: OOB buffer
|
|
* @start: first ECC byte to retrieve
|
|
* @nbytes: number of ECC bytes to retrieve
|
|
*
|
|
* Works like mtd_ooblayout_get_bytes(), except it acts on ECC bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_get_eccbytes(struct mtd_info *mtd, u8 *eccbuf,
|
|
const u8 *oobbuf, int start, int nbytes)
|
|
{
|
|
return mtd_ooblayout_get_bytes(mtd, eccbuf, oobbuf, start, nbytes,
|
|
mtd_ooblayout_ecc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_get_eccbytes);
|
|
|
|
/**
|
|
* mtd_ooblayout_set_eccbytes - set ECC bytes into the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @eccbuf: source buffer to get ECC bytes from
|
|
* @oobbuf: OOB buffer
|
|
* @start: first ECC byte to set
|
|
* @nbytes: number of ECC bytes to set
|
|
*
|
|
* Works like mtd_ooblayout_set_bytes(), except it acts on ECC bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_set_eccbytes(struct mtd_info *mtd, const u8 *eccbuf,
|
|
u8 *oobbuf, int start, int nbytes)
|
|
{
|
|
return mtd_ooblayout_set_bytes(mtd, eccbuf, oobbuf, start, nbytes,
|
|
mtd_ooblayout_ecc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_set_eccbytes);
|
|
|
|
/**
|
|
* mtd_ooblayout_get_databytes - extract data bytes from the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @databuf: destination buffer to store ECC bytes
|
|
* @oobbuf: OOB buffer
|
|
* @start: first ECC byte to retrieve
|
|
* @nbytes: number of ECC bytes to retrieve
|
|
*
|
|
* Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_get_databytes(struct mtd_info *mtd, u8 *databuf,
|
|
const u8 *oobbuf, int start, int nbytes)
|
|
{
|
|
return mtd_ooblayout_get_bytes(mtd, databuf, oobbuf, start, nbytes,
|
|
mtd_ooblayout_free);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_get_databytes);
|
|
|
|
/**
|
|
* mtd_ooblayout_get_eccbytes - set data bytes into the oob buffer
|
|
* @mtd: mtd info structure
|
|
* @eccbuf: source buffer to get data bytes from
|
|
* @oobbuf: OOB buffer
|
|
* @start: first ECC byte to set
|
|
* @nbytes: number of ECC bytes to set
|
|
*
|
|
* Works like mtd_ooblayout_get_bytes(), except it acts on free bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_set_databytes(struct mtd_info *mtd, const u8 *databuf,
|
|
u8 *oobbuf, int start, int nbytes)
|
|
{
|
|
return mtd_ooblayout_set_bytes(mtd, databuf, oobbuf, start, nbytes,
|
|
mtd_ooblayout_free);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_set_databytes);
|
|
|
|
/**
|
|
* mtd_ooblayout_count_freebytes - count the number of free bytes in OOB
|
|
* @mtd: mtd info structure
|
|
*
|
|
* Works like mtd_ooblayout_count_bytes(), except it count free bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_count_freebytes(struct mtd_info *mtd)
|
|
{
|
|
return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_free);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_count_freebytes);
|
|
|
|
/**
|
|
* mtd_ooblayout_count_freebytes - count the number of ECC bytes in OOB
|
|
* @mtd: mtd info structure
|
|
*
|
|
* Works like mtd_ooblayout_count_bytes(), except it count ECC bytes.
|
|
*
|
|
* Returns zero on success, a negative error code otherwise.
|
|
*/
|
|
int mtd_ooblayout_count_eccbytes(struct mtd_info *mtd)
|
|
{
|
|
return mtd_ooblayout_count_bytes(mtd, mtd_ooblayout_ecc);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_ooblayout_count_eccbytes);
|
|
|
|
/*
|
|
* Method to access the protection register area, present in some flash
|
|
* devices. The user data is one time programmable but the factory data is read
|
|
* only.
|
|
*/
|
|
int mtd_get_fact_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
|
|
struct otp_info *buf)
|
|
{
|
|
if (!mtd->_get_fact_prot_info)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_get_fact_prot_info(mtd, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_fact_prot_info);
|
|
|
|
int mtd_read_fact_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
*retlen = 0;
|
|
if (!mtd->_read_fact_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_read_fact_prot_reg(mtd, from, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_read_fact_prot_reg);
|
|
|
|
int mtd_get_user_prot_info(struct mtd_info *mtd, size_t len, size_t *retlen,
|
|
struct otp_info *buf)
|
|
{
|
|
if (!mtd->_get_user_prot_info)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_get_user_prot_info(mtd, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_user_prot_info);
|
|
|
|
int mtd_read_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
*retlen = 0;
|
|
if (!mtd->_read_user_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_read_user_prot_reg(mtd, from, len, retlen, buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_read_user_prot_reg);
|
|
|
|
int mtd_write_user_prot_reg(struct mtd_info *mtd, loff_t to, size_t len,
|
|
size_t *retlen, u_char *buf)
|
|
{
|
|
int ret;
|
|
|
|
*retlen = 0;
|
|
if (!mtd->_write_user_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
ret = mtd->_write_user_prot_reg(mtd, to, len, retlen, buf);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* If no data could be written at all, we are out of memory and
|
|
* must return -ENOSPC.
|
|
*/
|
|
return (*retlen) ? 0 : -ENOSPC;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_write_user_prot_reg);
|
|
|
|
int mtd_lock_user_prot_reg(struct mtd_info *mtd, loff_t from, size_t len)
|
|
{
|
|
if (!mtd->_lock_user_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_lock_user_prot_reg(mtd, from, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_lock_user_prot_reg);
|
|
|
|
/* Chip-supported device locking */
|
|
int mtd_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
|
{
|
|
if (!mtd->_lock)
|
|
return -EOPNOTSUPP;
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_lock(mtd, ofs, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_lock);
|
|
|
|
int mtd_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
|
{
|
|
if (!mtd->_unlock)
|
|
return -EOPNOTSUPP;
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_unlock(mtd, ofs, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_unlock);
|
|
|
|
int mtd_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
|
|
{
|
|
if (!mtd->_is_locked)
|
|
return -EOPNOTSUPP;
|
|
if (ofs < 0 || ofs >= mtd->size || len > mtd->size - ofs)
|
|
return -EINVAL;
|
|
if (!len)
|
|
return 0;
|
|
return mtd->_is_locked(mtd, ofs, len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_is_locked);
|
|
|
|
int mtd_block_isreserved(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
if (ofs < 0 || ofs >= mtd->size)
|
|
return -EINVAL;
|
|
if (!mtd->_block_isreserved)
|
|
return 0;
|
|
return mtd->_block_isreserved(mtd, ofs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_block_isreserved);
|
|
|
|
int mtd_block_isbad(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
if (ofs < 0 || ofs >= mtd->size)
|
|
return -EINVAL;
|
|
if (!mtd->_block_isbad)
|
|
return 0;
|
|
return mtd->_block_isbad(mtd, ofs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_block_isbad);
|
|
|
|
int mtd_block_markbad(struct mtd_info *mtd, loff_t ofs)
|
|
{
|
|
if (!mtd->_block_markbad)
|
|
return -EOPNOTSUPP;
|
|
if (ofs < 0 || ofs >= mtd->size)
|
|
return -EINVAL;
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
return mtd->_block_markbad(mtd, ofs);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_block_markbad);
|
|
|
|
/*
|
|
* default_mtd_writev - the default writev method
|
|
* @mtd: mtd device description object pointer
|
|
* @vecs: the vectors to write
|
|
* @count: count of vectors in @vecs
|
|
* @to: the MTD device offset to write to
|
|
* @retlen: on exit contains the count of bytes written to the MTD device.
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
static int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen)
|
|
{
|
|
unsigned long i;
|
|
size_t totlen = 0, thislen;
|
|
int ret = 0;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (!vecs[i].iov_len)
|
|
continue;
|
|
ret = mtd_write(mtd, to, vecs[i].iov_len, &thislen,
|
|
vecs[i].iov_base);
|
|
totlen += thislen;
|
|
if (ret || thislen != vecs[i].iov_len)
|
|
break;
|
|
to += vecs[i].iov_len;
|
|
}
|
|
*retlen = totlen;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* mtd_writev - the vector-based MTD write method
|
|
* @mtd: mtd device description object pointer
|
|
* @vecs: the vectors to write
|
|
* @count: count of vectors in @vecs
|
|
* @to: the MTD device offset to write to
|
|
* @retlen: on exit contains the count of bytes written to the MTD device.
|
|
*
|
|
* This function returns zero in case of success and a negative error code in
|
|
* case of failure.
|
|
*/
|
|
int mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
|
|
unsigned long count, loff_t to, size_t *retlen)
|
|
{
|
|
*retlen = 0;
|
|
if (!(mtd->flags & MTD_WRITEABLE))
|
|
return -EROFS;
|
|
if (!mtd->_writev)
|
|
return default_mtd_writev(mtd, vecs, count, to, retlen);
|
|
return mtd->_writev(mtd, vecs, count, to, retlen);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_writev);
|
|
|
|
/**
|
|
* mtd_kmalloc_up_to - allocate a contiguous buffer up to the specified size
|
|
* @mtd: mtd device description object pointer
|
|
* @size: a pointer to the ideal or maximum size of the allocation, points
|
|
* to the actual allocation size on success.
|
|
*
|
|
* This routine attempts to allocate a contiguous kernel buffer up to
|
|
* the specified size, backing off the size of the request exponentially
|
|
* until the request succeeds or until the allocation size falls below
|
|
* the system page size. This attempts to make sure it does not adversely
|
|
* impact system performance, so when allocating more than one page, we
|
|
* ask the memory allocator to avoid re-trying, swapping, writing back
|
|
* or performing I/O.
|
|
*
|
|
* Note, this function also makes sure that the allocated buffer is aligned to
|
|
* the MTD device's min. I/O unit, i.e. the "mtd->writesize" value.
|
|
*
|
|
* This is called, for example by mtd_{read,write} and jffs2_scan_medium,
|
|
* to handle smaller (i.e. degraded) buffer allocations under low- or
|
|
* fragmented-memory situations where such reduced allocations, from a
|
|
* requested ideal, are allowed.
|
|
*
|
|
* Returns a pointer to the allocated buffer on success; otherwise, NULL.
|
|
*/
|
|
void *mtd_kmalloc_up_to(const struct mtd_info *mtd, size_t *size)
|
|
{
|
|
gfp_t flags = __GFP_NOWARN | __GFP_DIRECT_RECLAIM | __GFP_NORETRY;
|
|
size_t min_alloc = max_t(size_t, mtd->writesize, PAGE_SIZE);
|
|
void *kbuf;
|
|
|
|
*size = min_t(size_t, *size, KMALLOC_MAX_SIZE);
|
|
|
|
while (*size > min_alloc) {
|
|
kbuf = kmalloc(*size, flags);
|
|
if (kbuf)
|
|
return kbuf;
|
|
|
|
*size >>= 1;
|
|
*size = ALIGN(*size, mtd->writesize);
|
|
}
|
|
|
|
/*
|
|
* For the last resort allocation allow 'kmalloc()' to do all sorts of
|
|
* things (write-back, dropping caches, etc) by using GFP_KERNEL.
|
|
*/
|
|
return kmalloc(*size, GFP_KERNEL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_kmalloc_up_to);
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
/*====================================================================*/
|
|
/* Support for /proc/mtd */
|
|
|
|
static int mtd_proc_show(struct seq_file *m, void *v)
|
|
{
|
|
struct mtd_info *mtd;
|
|
|
|
seq_puts(m, "dev: size erasesize name\n");
|
|
mutex_lock(&mtd_table_mutex);
|
|
mtd_for_each_device(mtd) {
|
|
seq_printf(m, "mtd%d: %8.8llx %8.8x \"%s\"\n",
|
|
mtd->index, (unsigned long long)mtd->size,
|
|
mtd->erasesize, mtd->name);
|
|
}
|
|
mutex_unlock(&mtd_table_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static int mtd_proc_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, mtd_proc_show, NULL);
|
|
}
|
|
|
|
static const struct file_operations mtd_proc_ops = {
|
|
.open = mtd_proc_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*====================================================================*/
|
|
/* Init code */
|
|
|
|
static struct backing_dev_info * __init mtd_bdi_init(char *name)
|
|
{
|
|
struct backing_dev_info *bdi;
|
|
int ret;
|
|
|
|
bdi = bdi_alloc(GFP_KERNEL);
|
|
if (!bdi)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
bdi->name = name;
|
|
/*
|
|
* We put '-0' suffix to the name to get the same name format as we
|
|
* used to get. Since this is called only once, we get a unique name.
|
|
*/
|
|
ret = bdi_register(bdi, "%.28s-0", name);
|
|
if (ret)
|
|
bdi_put(bdi);
|
|
|
|
return ret ? ERR_PTR(ret) : bdi;
|
|
}
|
|
|
|
static struct proc_dir_entry *proc_mtd;
|
|
|
|
static int __init init_mtd(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = class_register(&mtd_class);
|
|
if (ret)
|
|
goto err_reg;
|
|
|
|
mtd_bdi = mtd_bdi_init("mtd");
|
|
if (IS_ERR(mtd_bdi)) {
|
|
ret = PTR_ERR(mtd_bdi);
|
|
goto err_bdi;
|
|
}
|
|
|
|
proc_mtd = proc_create("mtd", 0, NULL, &mtd_proc_ops);
|
|
|
|
ret = init_mtdchar();
|
|
if (ret)
|
|
goto out_procfs;
|
|
|
|
dfs_dir_mtd = debugfs_create_dir("mtd", NULL);
|
|
|
|
return 0;
|
|
|
|
out_procfs:
|
|
if (proc_mtd)
|
|
remove_proc_entry("mtd", NULL);
|
|
bdi_put(mtd_bdi);
|
|
err_bdi:
|
|
class_unregister(&mtd_class);
|
|
err_reg:
|
|
pr_err("Error registering mtd class or bdi: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit cleanup_mtd(void)
|
|
{
|
|
debugfs_remove_recursive(dfs_dir_mtd);
|
|
cleanup_mtdchar();
|
|
if (proc_mtd)
|
|
remove_proc_entry("mtd", NULL);
|
|
class_unregister(&mtd_class);
|
|
bdi_put(mtd_bdi);
|
|
idr_destroy(&mtd_idr);
|
|
}
|
|
|
|
module_init(init_mtd);
|
|
module_exit(cleanup_mtd);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Core MTD registration and access routines");
|