[U-Boot] [PATCH] Add MTD core & partition
Kyungmin Park
kmpark at infradead.org
Fri Aug 29 10:13:23 CEST 2008
It's preparation for UBI codes.
UBI uses partition and get & put mtd devices
Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
diff --git a/drivers/mtd/Makefile b/drivers/mtd/Makefile
index 6538f7a..d225a68 100644
--- a/drivers/mtd/Makefile
+++ b/drivers/mtd/Makefile
@@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libmtd.a
+COBJS-$(CONFIG_CMD_UBI) += mtdcore.o mtdpart.o
COBJS-$(CONFIG_HAS_DATAFLASH) += at45.o
COBJS-$(CONFIG_FLASH_CFI_DRIVER) += cfi_flash.o
COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
new file mode 100644
index 0000000..2fb6099
--- /dev/null
+++ b/drivers/mtd/mtdcore.c
@@ -0,0 +1,142 @@
+/*
+ * $Id: mtdcore.c,v 1.47 2005/11/07 11:14:20 gleixner Exp $
+ *
+ * Core registration and callback routines for MTD
+ * drivers and users.
+ */
+
+#include <linux/mtd/mtd.h>
+#include <mtd_uboot.h>
+#include <ubi_uboot.h>
+
+struct mtd_info *mtd_table[MAX_MTD_DEVICES];
+
+int add_mtd_device(struct mtd_info *mtd)
+{
+ int i;
+
+ BUG_ON(mtd->writesize == 0);
+
+ for (i=0; i < MAX_MTD_DEVICES; i++)
+ if (!mtd_table[i]) {
+ mtd_table[i] = mtd;
+ mtd->index = i;
+ mtd->usecount = 0;
+
+ printf("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 */
+
+ /* 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. :) */
+ return 0;
+ }
+
+ return 1;
+}
+
+/**
+ * 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;
+
+ if (mtd_table[mtd->index] != mtd) {
+ ret = -ENODEV;
+ } else 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 {
+ /* No need to get a refcount on the module containing
+ * the notifier, since we hold the mtd_table_mutex */
+ mtd_table[mtd->index] = NULL;
+
+ ret = 0;
+ }
+
+ return ret;
+}
+
+/**
+ * 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;
+ int i, err = -ENODEV;
+
+ if (num == -1) {
+ for (i=0; i< MAX_MTD_DEVICES; i++)
+ if (mtd_table[i] == mtd)
+ ret = mtd_table[i];
+ } else if (num < MAX_MTD_DEVICES) {
+ ret = mtd_table[num];
+ if (mtd && mtd != ret)
+ ret = NULL;
+ }
+
+ if (!ret)
+ goto out_unlock;
+
+ ret->usecount++;
+ return ret;
+
+out_unlock:
+ return ERR_PTR(err);
+}
+
+/**
+ * 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 i, err = -ENODEV;
+ struct mtd_info *mtd = NULL;
+
+ for (i = 0; i < MAX_MTD_DEVICES; i++) {
+ if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
+ mtd = mtd_table[i];
+ break;
+ }
+ }
+
+ if (!mtd)
+ goto out_unlock;
+
+ mtd->usecount++;
+ return mtd;
+
+out_unlock:
+ return ERR_PTR(err);
+}
+
+void put_mtd_device(struct mtd_info *mtd)
+{
+ int c;
+
+ c = --mtd->usecount;
+ BUG_ON(c < 0);
+}
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
new file mode 100644
index 0000000..113516a
--- /dev/null
+++ b/drivers/mtd/mtdpart.c
@@ -0,0 +1,531 @@
+/*
+ * Simple MTD partitioning layer
+ *
+ * (C) 2000 Nicolas Pitre <nico at cam.org>
+ *
+ * This code is GPL
+ *
+ * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
+ *
+ * 02-21-2002 Thomas Gleixner <gleixner at autronix.de>
+ * added support for read_oob, write_oob
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <asm/errno.h>
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/compat.h>
+
+/* Our partition linked list */
+static LIST_HEAD(mtd_partitions);
+
+/* Our partition node structure */
+struct mtd_part {
+ struct mtd_info mtd;
+ struct mtd_info *master;
+ u_int32_t offset;
+ int index;
+ struct list_head list;
+ int registered;
+};
+
+/*
+ * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
+ * the pointer to that structure with this macro.
+ */
+#define PART(x) ((struct mtd_part *)(x))
+
+
+/*
+ * MTD methods which simply translate the effective address and pass through
+ * to the _real_ device.
+ */
+
+static int part_read (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ int res;
+
+ if (from >= mtd->size)
+ len = 0;
+ else if (from + len > mtd->size)
+ len = mtd->size - from;
+ res = part->master->read (part->master, from + part->offset,
+ len, retlen, buf);
+#if 0
+ if (unlikely(res)) {
+ if (res == -EUCLEAN)
+ mtd->ecc_stats.corrected++;
+ if (res == -EBADMSG)
+ mtd->ecc_stats.failed++;
+ }
+#endif
+ return res;
+}
+
+#if 0
+static int part_point (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, void **virt, resource_size_t *phys)
+{
+ struct mtd_part *part = PART(mtd);
+ if (from >= mtd->size)
+ len = 0;
+ else if (from + len > mtd->size)
+ len = mtd->size - from;
+ return part->master->point (part->master, from + part->offset,
+ len, retlen, virt, phys);
+}
+
+static void part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+
+ part->master->unpoint(part->master, from + part->offset, len);
+}
+
+static int part_read_oob(struct mtd_info *mtd, loff_t from,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_part *part = PART(mtd);
+ int res;
+
+ if (from >= mtd->size)
+ return -EINVAL;
+ if (ops->datbuf && from + ops->len > mtd->size)
+ return -EINVAL;
+ res = part->master->read_oob(part->master, from + part->offset, ops);
+
+ if (unlikely(res)) {
+ if (res == -EUCLEAN)
+ mtd->ecc_stats.corrected++;
+ if (res == -EBADMSG)
+ mtd->ecc_stats.failed++;
+ }
+ return res;
+}
+
+static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->read_user_prot_reg (part->master, from,
+ len, retlen, buf);
+}
+
+static int part_get_user_prot_info (struct mtd_info *mtd,
+ struct otp_info *buf, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->get_user_prot_info (part->master, buf, len);
+}
+
+static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->read_fact_prot_reg (part->master, from,
+ len, retlen, buf);
+}
+
+static int part_get_fact_prot_info (struct mtd_info *mtd,
+ struct otp_info *buf, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->get_fact_prot_info (part->master, buf, len);
+}
+#endif
+
+static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (to >= mtd->size)
+ len = 0;
+ else if (to + len > mtd->size)
+ len = mtd->size - to;
+ return part->master->write (part->master, to + part->offset,
+ len, retlen, buf);
+}
+
+#if 0
+static int part_panic_write (struct mtd_info *mtd, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (to >= mtd->size)
+ len = 0;
+ else if (to + len > mtd->size)
+ len = mtd->size - to;
+ return part->master->panic_write (part->master, to + part->offset,
+ len, retlen, buf);
+}
+
+static int part_write_oob(struct mtd_info *mtd, loff_t to,
+ struct mtd_oob_ops *ops)
+{
+ struct mtd_part *part = PART(mtd);
+
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+
+ if (to >= mtd->size)
+ return -EINVAL;
+ if (ops->datbuf && to + ops->len > mtd->size)
+ return -EINVAL;
+ return part->master->write_oob(part->master, to + part->offset, ops);
+}
+
+static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
+ size_t *retlen, u_char *buf)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->write_user_prot_reg (part->master, from,
+ len, retlen, buf);
+}
+
+static int part_lock_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->lock_user_prot_reg (part->master, from, len);
+}
+
+static int part_writev (struct mtd_info *mtd, const struct kvec *vecs,
+ unsigned long count, loff_t to, size_t *retlen)
+{
+ struct mtd_part *part = PART(mtd);
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ return part->master->writev (part->master, vecs, count,
+ to + part->offset, retlen);
+}
+#endif
+
+static int part_erase (struct mtd_info *mtd, struct erase_info *instr)
+{
+ struct mtd_part *part = PART(mtd);
+ int ret;
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (instr->addr >= mtd->size)
+ return -EINVAL;
+ instr->addr += part->offset;
+ ret = part->master->erase(part->master, instr);
+ if (ret) {
+ if (instr->fail_addr != 0xffffffff)
+ instr->fail_addr -= part->offset;
+ instr->addr -= part->offset;
+ }
+ return ret;
+}
+
+void mtd_erase_callback(struct erase_info *instr)
+{
+ if (instr->mtd->erase == part_erase) {
+ struct mtd_part *part = PART(instr->mtd);
+
+ if (instr->fail_addr != 0xffffffff)
+ instr->fail_addr -= part->offset;
+ instr->addr -= part->offset;
+ }
+ if (instr->callback)
+ instr->callback(instr);
+}
+#if 0
+EXPORT_SYMBOL_GPL(mtd_erase_callback);
+#endif
+
+#if 0
+static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+ if ((len + ofs) > mtd->size)
+ return -EINVAL;
+ return part->master->lock(part->master, ofs + part->offset, len);
+}
+
+static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len)
+{
+ struct mtd_part *part = PART(mtd);
+ if ((len + ofs) > mtd->size)
+ return -EINVAL;
+ return part->master->unlock(part->master, ofs + part->offset, len);
+}
+#endif
+
+static void part_sync(struct mtd_info *mtd)
+{
+ struct mtd_part *part = PART(mtd);
+ part->master->sync(part->master);
+}
+
+#if 0
+static int part_suspend(struct mtd_info *mtd)
+{
+ struct mtd_part *part = PART(mtd);
+ return part->master->suspend(part->master);
+}
+
+static void part_resume(struct mtd_info *mtd)
+{
+ struct mtd_part *part = PART(mtd);
+ part->master->resume(part->master);
+}
+#endif
+
+static int part_block_isbad (struct mtd_info *mtd, loff_t ofs)
+{
+ struct mtd_part *part = PART(mtd);
+ if (ofs >= mtd->size)
+ return -EINVAL;
+ ofs += part->offset;
+ return part->master->block_isbad(part->master, ofs);
+}
+
+static int part_block_markbad (struct mtd_info *mtd, loff_t ofs)
+{
+ struct mtd_part *part = PART(mtd);
+ int res;
+
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
+ if (ofs >= mtd->size)
+ return -EINVAL;
+ ofs += part->offset;
+ res = part->master->block_markbad(part->master, ofs);
+#if 0
+ if (!res)
+ mtd->ecc_stats.badblocks++;
+#endif
+ return res;
+}
+
+/*
+ * This function unregisters and destroy all slave MTD objects which are
+ * attached to the given master MTD object.
+ */
+
+int del_mtd_partitions(struct mtd_info *master)
+{
+ struct list_head *node;
+ struct mtd_part *slave;
+
+ for (node = mtd_partitions.next;
+ node != &mtd_partitions;
+ node = node->next) {
+ slave = list_entry(node, struct mtd_part, list);
+ if (slave->master == master) {
+ struct list_head *prev = node->prev;
+ __list_del(prev, node->next);
+ if(slave->registered)
+ del_mtd_device(&slave->mtd);
+ kfree(slave);
+ node = prev;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * This function, given a master MTD object and a partition table, creates
+ * and registers slave MTD objects which are bound to the master according to
+ * the partition definitions.
+ * (Q: should we register the master MTD object as well?)
+ */
+
+int add_mtd_partitions(struct mtd_info *master,
+ const struct mtd_partition *parts,
+ int nbparts)
+{
+ struct mtd_part *slave;
+ u_int32_t cur_offset = 0;
+ int i;
+
+ printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
+
+ for (i = 0; i < nbparts; i++) {
+
+ /* allocate the partition structure */
+ slave = kzalloc (sizeof(*slave), GFP_KERNEL);
+ if (!slave) {
+ printk ("memory allocation error while creating partitions for \"%s\"\n",
+ master->name);
+ del_mtd_partitions(master);
+ return -ENOMEM;
+ }
+ list_add(&slave->list, &mtd_partitions);
+
+ /* set up the MTD object for this partition */
+ slave->mtd.type = master->type;
+ slave->mtd.flags = master->flags & ~parts[i].mask_flags;
+ slave->mtd.size = parts[i].size;
+ slave->mtd.writesize = master->writesize;
+ slave->mtd.oobsize = master->oobsize;
+ slave->mtd.oobavail = master->oobavail;
+ slave->mtd.subpage_sft = master->subpage_sft;
+
+ slave->mtd.name = parts[i].name;
+ slave->mtd.owner = master->owner;
+
+ slave->mtd.read = part_read;
+ slave->mtd.write = part_write;
+
+#if 0
+ if (master->panic_write)
+ slave->mtd.panic_write = part_panic_write;
+
+ if(master->point && master->unpoint){
+ slave->mtd.point = part_point;
+ slave->mtd.unpoint = part_unpoint;
+ }
+
+ if (master->read_oob)
+ slave->mtd.read_oob = part_read_oob;
+ if (master->write_oob)
+ slave->mtd.write_oob = part_write_oob;
+ if(master->read_user_prot_reg)
+ slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
+ if(master->read_fact_prot_reg)
+ slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
+ if(master->write_user_prot_reg)
+ slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
+ if(master->lock_user_prot_reg)
+ slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
+ if(master->get_user_prot_info)
+ slave->mtd.get_user_prot_info = part_get_user_prot_info;
+ if(master->get_fact_prot_info)
+ slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
+#endif
+ if (master->sync)
+ slave->mtd.sync = part_sync;
+#if 0
+ if (!i && master->suspend && master->resume) {
+ slave->mtd.suspend = part_suspend;
+ slave->mtd.resume = part_resume;
+ }
+ if (master->writev)
+ slave->mtd.writev = part_writev;
+ if (master->lock)
+ slave->mtd.lock = part_lock;
+ if (master->unlock)
+ slave->mtd.unlock = part_unlock;
+#endif
+ if (master->block_isbad)
+ slave->mtd.block_isbad = part_block_isbad;
+ if (master->block_markbad)
+ slave->mtd.block_markbad = part_block_markbad;
+ slave->mtd.erase = part_erase;
+ slave->master = master;
+ slave->offset = parts[i].offset;
+ slave->index = i;
+
+ if (slave->offset == MTDPART_OFS_APPEND)
+ slave->offset = cur_offset;
+ if (slave->offset == MTDPART_OFS_NXTBLK) {
+ slave->offset = cur_offset;
+ if ((cur_offset % master->erasesize) != 0) {
+ /* Round up to next erasesize */
+ slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
+ printk(KERN_NOTICE "Moving partition %d: "
+ "0x%08x -> 0x%08x\n", i,
+ cur_offset, slave->offset);
+ }
+ }
+ if (slave->mtd.size == MTDPART_SIZ_FULL)
+ slave->mtd.size = master->size - slave->offset;
+ cur_offset = slave->offset + slave->mtd.size;
+
+ printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
+ slave->offset + slave->mtd.size, slave->mtd.name);
+
+ /* let's do some sanity checks */
+ if (slave->offset >= master->size) {
+ /* let's register it anyway to preserve ordering */
+ slave->offset = 0;
+ slave->mtd.size = 0;
+ printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
+ parts[i].name);
+ }
+ if (slave->offset + slave->mtd.size > master->size) {
+ slave->mtd.size = master->size - slave->offset;
+ printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
+ parts[i].name, master->name, slave->mtd.size);
+ }
+ if (master->numeraseregions>1) {
+ /* Deal with variable erase size stuff */
+ int i;
+ struct mtd_erase_region_info *regions = master->eraseregions;
+
+ /* Find the first erase regions which is part of this partition. */
+ for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
+ ;
+
+ for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
+ if (slave->mtd.erasesize < regions[i].erasesize) {
+ slave->mtd.erasesize = regions[i].erasesize;
+ }
+ }
+ } else {
+ /* Single erase size */
+ slave->mtd.erasesize = master->erasesize;
+ }
+
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+ (slave->offset % slave->mtd.erasesize)) {
+ /* Doesn't start on a boundary of major erase size */
+ /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
+ parts[i].name);
+ }
+ if ((slave->mtd.flags & MTD_WRITEABLE) &&
+ (slave->mtd.size % slave->mtd.erasesize)) {
+ slave->mtd.flags &= ~MTD_WRITEABLE;
+ printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
+ parts[i].name);
+ }
+
+#if 0
+ slave->mtd.ecclayout = master->ecclayout;
+ if (master->block_isbad) {
+ uint32_t offs = 0;
+
+ while(offs < slave->mtd.size) {
+ if (master->block_isbad(master,
+ offs + slave->offset))
+ slave->mtd.ecc_stats.badblocks++;
+ offs += slave->mtd.erasesize;
+ }
+ }
+
+ if(parts[i].mtdp)
+ { /* store the object pointer (caller may or may not register it */
+ *parts[i].mtdp = &slave->mtd;
+ slave->registered = 0;
+ }
+ else
+#endif
+ {
+ /* register our partition */
+ add_mtd_device(&slave->mtd);
+ slave->registered = 1;
+ }
+ }
+
+ return 0;
+}
+
+#if 0
+EXPORT_SYMBOL(add_mtd_partitions);
+EXPORT_SYMBOL(del_mtd_partitions);
+#endif
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