diff options
Diffstat (limited to 'target/linux/sunxi/patches-4.1/113-mtd-nand-add-pst.patch')
-rw-r--r-- | target/linux/sunxi/patches-4.1/113-mtd-nand-add-pst.patch | 261 |
1 files changed, 0 insertions, 261 deletions
diff --git a/target/linux/sunxi/patches-4.1/113-mtd-nand-add-pst.patch b/target/linux/sunxi/patches-4.1/113-mtd-nand-add-pst.patch deleted file mode 100644 index 45b9679..0000000 --- a/target/linux/sunxi/patches-4.1/113-mtd-nand-add-pst.patch +++ /dev/null @@ -1,261 +0,0 @@ -From bec69bb8e85151729014d859106dcc3fe652b1d4 Mon Sep 17 00:00:00 2001 -From: Boris BREZILLON <boris.brezillon@free-electrons.com> -Date: Mon, 28 Jul 2014 14:45:40 +0200 -Subject: [PATCH] mtd: nand: Add page status table (pst) - -Page status table is an byte array storing pages status. -It defines 3 status: - - unknown: the page has not been read yet and we do not know its current - state - - empty: the page contains only FFs - - filled: the page has been filled with data - -Care must be taken: an empty page does not mean it can be written, because -it might have already been written with only FFs. - -These page status are useful to check wether the controller should try to -correct errors (using ECC) or a derandomize data (using a randomizer -block). - -Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> -Signed-off-by: Hans de Goede <hdegoede@redhat.com> ---- - drivers/mtd/nand/nand_base.c | 154 +++++++++++++++++++++++++++++++++++++++++++ - include/linux/mtd/nand.h | 21 ++++++ - 2 files changed, 175 insertions(+) - ---- a/drivers/mtd/nand/nand_base.c -+++ b/drivers/mtd/nand/nand_base.c -@@ -1102,6 +1102,138 @@ out: - EXPORT_SYMBOL(nand_lock); - - /** -+ * nand_page_is_empty - check wether a NAND page contains only FFs -+ * @mtd: mtd info -+ * @data: data buffer -+ * @oob: oob buffer -+ * -+ * Reads the data stored in the databuf buffer and check if it contains only -+ * FFs. -+ * -+ * Return true if it does else return false. -+ */ -+bool nand_page_is_empty(struct mtd_info *mtd, void *data, void *oob) -+{ -+ u8 *buf; -+ int length; -+ u32 pattern = 0xffffffff; -+ int bitflips = 0; -+ int cnt; -+ -+ buf = data; -+ length = mtd->writesize; -+ while (length) { -+ cnt = length < sizeof(pattern) ? length : sizeof(pattern); -+ if (memcmp(&pattern, buf, cnt)) { -+ int i; -+ for (i = 0; i < cnt * BITS_PER_BYTE; i++) { -+ if (!(buf[i / BITS_PER_BYTE] & -+ (1 << (i % BITS_PER_BYTE)))) { -+ bitflips++; -+ if (bitflips > mtd->ecc_strength) -+ return false; -+ } -+ } -+ } -+ -+ buf += sizeof(pattern); -+ length -= sizeof(pattern); -+ } -+ -+ buf = oob; -+ length = mtd->oobsize; -+ while (length) { -+ cnt = length < sizeof(pattern) ? length : sizeof(pattern); -+ if (memcmp(&pattern, buf, cnt)) { -+ int i; -+ for (i = 0; i < cnt * BITS_PER_BYTE; i++) { -+ if (!(buf[i / BITS_PER_BYTE] & -+ (1 << (i % BITS_PER_BYTE)))) { -+ bitflips++; -+ if (bitflips > mtd->ecc_strength) -+ return false; -+ } -+ } -+ } -+ -+ buf += sizeof(pattern); -+ length -= sizeof(pattern); -+ } -+ -+ return true; -+} -+EXPORT_SYMBOL(nand_page_is_empty); -+ -+/** -+ * nand_page_get_status - retrieve page status from the page status table (pst) -+ * @mtd: mtd info -+ * @page: page you want to get status on -+ * -+ * Return the page status. -+ */ -+int nand_page_get_status(struct mtd_info *mtd, int page) -+{ -+ struct nand_chip *chip = mtd->priv; -+ u8 shift = (page % 4) * 2; -+ uint64_t offset = page / 4; -+ int ret = NAND_PAGE_STATUS_UNKNOWN; -+ -+ if (chip->pst) -+ ret = (chip->pst[offset] >> shift) & 0x3; -+ -+ return ret; -+} -+EXPORT_SYMBOL(nand_page_get_status); -+ -+/** -+ * nand_page_set_status - assign page status from in the page status table -+ * @mtd: mtd info -+ * @page: page you want to get status on -+ * @status: new status to assign -+ */ -+void nand_page_set_status(struct mtd_info *mtd, int page, -+ enum nand_page_status status) -+{ -+ struct nand_chip *chip = mtd->priv; -+ u8 shift; -+ uint64_t offset; -+ -+ if (!chip->pst) -+ return; -+ -+ shift = (page % 4) * 2; -+ offset = page / 4; -+ chip->pst[offset] &= ~(0x3 << shift); -+ chip->pst[offset] |= (status & 0x3) << shift; -+} -+EXPORT_SYMBOL(nand_page_set_status); -+ -+/** -+ * nand_pst_create - create a page status table -+ * @mtd: mtd info -+ * -+ * Allocate a page status table and assign it to the mtd device. -+ * -+ * Returns 0 in case of success or -ERRNO in case of error. -+ */ -+int nand_pst_create(struct mtd_info *mtd) -+{ -+ struct nand_chip *chip = mtd->priv; -+ -+ if (chip->pst) -+ return 0; -+ -+ chip->pst = kzalloc(mtd->size >> -+ (chip->page_shift + mtd->subpage_sft + 2), -+ GFP_KERNEL); -+ if (!chip->pst) -+ return -ENOMEM; -+ -+ return 0; -+} -+EXPORT_SYMBOL(nand_pst_create); -+ -+/** - * nand_read_page_raw - [INTERN] read raw page data without ecc - * @mtd: mtd info structure - * @chip: nand chip info structure -@@ -2539,6 +2671,7 @@ static int nand_do_write_ops(struct mtd_ - uint8_t *wbuf = buf; - int use_bufpoi; - int part_pagewr = (column || writelen < (mtd->writesize - 1)); -+ int subpage; - - if (part_pagewr) - use_bufpoi = 1; -@@ -2574,6 +2707,14 @@ static int nand_do_write_ops(struct mtd_ - if (ret) - break; - -+ for (subpage = column / chip->subpagesize; -+ subpage < (column + writelen) / chip->subpagesize; -+ subpage++) -+ nand_page_set_status(mtd, -+ (page << mtd->subpage_sft) + -+ subpage, -+ NAND_PAGE_FILLED); -+ - writelen -= bytes; - if (!writelen) - break; -@@ -2979,6 +3120,7 @@ int nand_erase_nand(struct mtd_info *mtd - int page, status, pages_per_block, ret, chipnr; - struct nand_chip *chip = mtd->priv; - loff_t len; -+ int i; - - pr_debug("%s: start = 0x%012llx, len = %llu\n", - __func__, (unsigned long long)instr->addr, -@@ -3051,6 +3193,18 @@ int nand_erase_nand(struct mtd_info *mtd - goto erase_exit; - } - -+ for (i = 0; i < pages_per_block; i++) { -+ int subpage; -+ for (subpage = 0; -+ subpage < 1 << mtd->subpage_sft; -+ subpage++) { -+ nand_page_set_status(mtd, -+ ((page + i) << mtd->subpage_sft) + -+ subpage, -+ NAND_PAGE_EMPTY); -+ } -+ } -+ - /* Increment page address and decrement length */ - len -= (1ULL << chip->phys_erase_shift); - page += pages_per_block; ---- a/include/linux/mtd/nand.h -+++ b/include/linux/mtd/nand.h -@@ -521,6 +521,24 @@ struct nand_ecc_ctrl { - int page); - }; - -+/* -+ * Constants for page status -+ */ -+enum nand_page_status { -+ NAND_PAGE_STATUS_UNKNOWN, -+ NAND_PAGE_EMPTY, -+ NAND_PAGE_FILLED, -+}; -+ -+bool nand_page_is_empty(struct mtd_info *mtd, void *data, void *oob); -+ -+int nand_page_get_status(struct mtd_info *mtd, int page); -+ -+void nand_page_set_status(struct mtd_info *mtd, int page, -+ enum nand_page_status status); -+ -+int nand_pst_create(struct mtd_info *mtd); -+ - /** - * struct nand_buffers - buffer structure for read/write - * @ecccalc: buffer pointer for calculated ECC, size is oobsize. -@@ -630,6 +648,7 @@ struct nand_buffers { - * @bbt_md: [REPLACEABLE] bad block table mirror descriptor - * @badblock_pattern: [REPLACEABLE] bad block scan pattern used for initial - * bad block scan. -+ * @pst: [INTERN] page status table - * @controller: [REPLACEABLE] a pointer to a hardware controller - * structure which is shared among multiple independent - * devices. -@@ -718,6 +737,8 @@ struct nand_chip { - - struct nand_bbt_descr *badblock_pattern; - -+ uint8_t *pst; -+ - struct list_head partitions; - struct mutex part_lock; - |