]> git.sur5r.net Git - u-boot/commitdiff
OneNAND support (take #2)
authorKyungmin Park <kmpark@infradead.org>
Mon, 10 Sep 2007 08:14:34 +0000 (17:14 +0900)
committerStefan Roese <sr@denx.de>
Mon, 17 Sep 2007 06:18:42 +0000 (08:18 +0200)
[PATCH 2/3] OneNAND support (take #2)

OneNAND support at U-Boot

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
drivers/onenand/Makefile [new file with mode: 0644]
drivers/onenand/onenand_bbt.c [new file with mode: 0644]

diff --git a/drivers/onenand/Makefile b/drivers/onenand/Makefile
new file mode 100644 (file)
index 0000000..5d7a471
--- /dev/null
@@ -0,0 +1,44 @@
+#
+# Copyright (C) 2005-2007 Samsung Electronics. 
+# Kyungmin Park <kyungmin.park@samsung.com> 
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB    := $(obj)libonenand.a
+
+COBJS  := onenand_base.o onenand_bbt.o
+
+SRCS   := $(COBJS:.o=.c)
+OBJS   := $(addprefix $(obj),$(COBJS))
+
+all:   $(LIB)
+
+$(LIB): $(obj).depend $(OBJS)
+       $(AR) $(ARFLAGS) $@ $(OBJS)
+
+#########################################################################
+
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/onenand/onenand_bbt.c b/drivers/onenand/onenand_bbt.c
new file mode 100644 (file)
index 0000000..5a610ee
--- /dev/null
@@ -0,0 +1,265 @@
+/*
+ *  linux/drivers/mtd/onenand/onenand_bbt.c
+ *
+ *  Bad Block Table support for the OneNAND driver
+ *
+ *  Copyright(c) 2005-2007 Samsung Electronics
+ *  Kyungmin Park <kyungmin.park@samsung.com>
+ *
+ *  TODO:
+ *    Split BBT core and chip specific BBT.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <common.h>
+
+#ifdef CONFIG_CMD_ONENAND
+
+#include <linux/mtd/compat.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/onenand.h>
+#include <malloc.h>
+
+#include <asm/errno.h>
+
+/**
+ * check_short_pattern - [GENERIC] check if a pattern is in the buffer
+ * @param buf          the buffer to search
+ * @param len          the length of buffer to search
+ * @param paglen       the pagelength
+ * @param td           search pattern descriptor
+ *
+ * Check for a pattern at the given place. Used to search bad block
+ * tables and good / bad block identifiers. Same as check_pattern, but
+ * no optional empty check and the pattern is expected to start
+ * at offset 0.
+ */
+static int check_short_pattern(uint8_t * buf, int len, int paglen,
+                              struct nand_bbt_descr *td)
+{
+       int i;
+       uint8_t *p = buf;
+
+       /* Compare the pattern */
+       for (i = 0; i < td->len; i++) {
+               if (p[i] != td->pattern[i])
+                       return -1;
+       }
+       return 0;
+}
+
+/**
+ * create_bbt - [GENERIC] Create a bad block table by scanning the device
+ * @param mtd          MTD device structure
+ * @param buf          temporary buffer
+ * @param bd           descriptor for the good/bad block search pattern
+ * @param chip         create the table for a specific chip, -1 read all chips.
+ *              Applies only if NAND_BBT_PERCHIP option is set
+ *
+ * Create a bad block table by scanning the device
+ * for the given good/bad block identify pattern
+ */
+static int create_bbt(struct mtd_info *mtd, uint8_t * buf,
+                     struct nand_bbt_descr *bd, int chip)
+{
+       struct onenand_chip *this = mtd->priv;
+       struct bbm_info *bbm = this->bbm;
+       int i, j, numblocks, len, scanlen;
+       int startblock;
+       loff_t from;
+       size_t readlen, ooblen;
+
+       printk(KERN_INFO "Scanning device for bad blocks\n");
+
+       len = 1;
+
+       /* We need only read few bytes from the OOB area */
+       scanlen = ooblen = 0;
+       readlen = bd->len;
+
+       /* chip == -1 case only */
+       /* Note that numblocks is 2 * (real numblocks) here;
+        * see i += 2 below as it makses shifting and masking less painful
+        */
+       numblocks = mtd->size >> (bbm->bbt_erase_shift - 1);
+       startblock = 0;
+       from = 0;
+
+       for (i = startblock; i < numblocks;) {
+               int ret;
+
+               for (j = 0; j < len; j++) {
+                       size_t retlen;
+
+                       /* No need to read pages fully,
+                        * just read required OOB bytes */
+                       ret = onenand_read_oob(mtd,
+                                            from + j * mtd->oobblock +
+                                            bd->offs, readlen, &retlen,
+                                            &buf[0]);
+
+                       if (ret && ret != -EAGAIN) {
+                               printk("ret = %d\n", ret);
+                               return ret;
+                       }
+
+                       if (check_short_pattern
+                           (&buf[j * scanlen], scanlen, mtd->oobblock, bd)) {
+                               bbm->bbt[i >> 3] |= 0x03 << (i & 0x6);
+                               printk(KERN_WARNING
+                                      "Bad eraseblock %d at 0x%08x\n", i >> 1,
+                                      (unsigned int)from);
+                               break;
+                       }
+               }
+               i += 2;
+               from += (1 << bbm->bbt_erase_shift);
+       }
+
+       return 0;
+}
+
+/**
+ * onenand_memory_bbt - [GENERIC] create a memory based bad block table
+ * @param mtd          MTD device structure
+ * @param bd           descriptor for the good/bad block search pattern
+ *
+ * The function creates a memory based bbt by scanning the device
+ * for manufacturer / software marked good / bad blocks
+ */
+static inline int onenand_memory_bbt(struct mtd_info *mtd,
+                                    struct nand_bbt_descr *bd)
+{
+       unsigned char data_buf[MAX_ONENAND_PAGESIZE];
+
+       bd->options &= ~NAND_BBT_SCANEMPTY;
+       return create_bbt(mtd, data_buf, bd, -1);
+}
+
+/**
+ * onenand_isbad_bbt - [OneNAND Interface] Check if a block is bad
+ * @param mtd          MTD device structure
+ * @param offs         offset in the device
+ * @param allowbbt     allow access to bad block table region
+ */
+static int onenand_isbad_bbt(struct mtd_info *mtd, loff_t offs, int allowbbt)
+{
+       struct onenand_chip *this = mtd->priv;
+       struct bbm_info *bbm = this->bbm;
+       int block;
+       uint8_t res;
+
+       /* Get block number * 2 */
+       block = (int)(offs >> (bbm->bbt_erase_shift - 1));
+       res = (bbm->bbt[block >> 3] >> (block & 0x06)) & 0x03;
+
+       DEBUG(MTD_DEBUG_LEVEL2,
+             "onenand_isbad_bbt: bbt info for offs 0x%08x: (block %d) 0x%02x\n",
+             (unsigned int)offs, block >> 1, res);
+
+       switch ((int)res) {
+       case 0x00:
+               return 0;
+       case 0x01:
+               return 1;
+       case 0x02:
+               return allowbbt ? 0 : 1;
+       }
+
+       return 1;
+}
+
+/**
+ * onenand_scan_bbt - [OneNAND Interface] scan, find, read and maybe create bad block table(s)
+ * @param mtd          MTD device structure
+ * @param bd           descriptor for the good/bad block search pattern
+ *
+ * The function checks, if a bad block table(s) is/are already
+ * available. If not it scans the device for manufacturer
+ * marked good / bad blocks and writes the bad block table(s) to
+ * the selected place.
+ *
+ * The bad block table memory is allocated here. It must be freed
+ * by calling the onenand_free_bbt function.
+ *
+ */
+int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
+{
+       struct onenand_chip *this = mtd->priv;
+       struct bbm_info *bbm = this->bbm;
+       int len, ret = 0;
+
+       len = mtd->size >> (this->erase_shift + 2);
+       /* Allocate memory (2bit per block) */
+       bbm->bbt = malloc(len);
+       if (!bbm->bbt) {
+               printk(KERN_ERR "onenand_scan_bbt: Out of memory\n");
+               return -ENOMEM;
+       }
+       /* Clear the memory bad block table */
+       memset(bbm->bbt, 0x00, len);
+
+       /* Set the bad block position */
+       bbm->badblockpos = ONENAND_BADBLOCK_POS;
+
+       /* Set erase shift */
+       bbm->bbt_erase_shift = this->erase_shift;
+
+       if (!bbm->isbad_bbt)
+               bbm->isbad_bbt = onenand_isbad_bbt;
+
+       /* Scan the device to build a memory based bad block table */
+       if ((ret = onenand_memory_bbt(mtd, bd))) {
+               printk(KERN_ERR
+                      "onenand_scan_bbt: Can't scan flash and build the RAM-based BBT\n");
+               free(bbm->bbt);
+               bbm->bbt = NULL;
+       }
+
+       return ret;
+}
+
+/*
+ * Define some generic bad / good block scan pattern which are used
+ * while scanning a device for factory marked good / bad blocks.
+ */
+static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
+
+static struct nand_bbt_descr largepage_memorybased = {
+       .options = 0,
+       .offs = 0,
+       .len = 2,
+       .pattern = scan_ff_pattern,
+};
+
+/**
+ * onenand_default_bbt - [OneNAND Interface] Select a default bad block table for the device
+ * @param mtd          MTD device structure
+ *
+ * This function selects the default bad block table
+ * support for the device and calls the onenand_scan_bbt function
+ */
+int onenand_default_bbt(struct mtd_info *mtd)
+{
+       struct onenand_chip *this = mtd->priv;
+       struct bbm_info *bbm;
+
+       this->bbm = malloc(sizeof(struct bbm_info));
+       if (!this->bbm)
+               return -ENOMEM;
+
+       bbm = this->bbm;
+
+       memset(bbm, 0, sizeof(struct bbm_info));
+
+       /* 1KB page has same configuration as 2KB page */
+       if (!bbm->badblock_pattern)
+               bbm->badblock_pattern = &largepage_memorybased;
+
+       return onenand_scan_bbt(mtd, bbm->badblock_pattern);
+}
+
+#endif /* CFG_CMD_ONENAND */