ralink: add missing nand layer hack
It turned out that mtk_nand driver uses some sophisticated accounting and a general nand code must be patched. This patch adds required read and erase calls to a general nand code. I used a code for re6500 released by Linksys as a reference. All required operations (erase, write and read) are usable. However I found that jffs2 filesystem can be created only on top of a ubi volume. I tried to create jffs2 directly on mtd device but pages with clean markers are became uncorrectable. Signed-off-by: Kirill Berezin <fyiwdt@gmail.com> SVN-Revision: 47565
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John Crispin
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From patchwork Fri Nov 13 07:55:08 2015
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [OpenWrt-Devel,RFC] A patch for mt7621 nand controler. Revision 2.
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From: Kirill Berezin <fyiwdt@gmail.com>
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X-Patchwork-Id: 544092
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Message-Id: <CAOFwh=DZieEa4ZA0ex6G3OR2OgEeP6Fh+SSw=Zg-L0wWm1QRTA@mail.gmail.com>
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To: openwrt-devel@lists.openwrt.org
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Date: Fri, 13 Nov 2015 10:55:08 +0300
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Hello,
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It turned out that mtk_nand driver uses some sophisticated accounting and a
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general nand code must be patched.
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This patch adds required read and erase calls to a general nand code. I
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used a code for re6500 released by Linksys as a reference.
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All required operations (erase, write and read) are usable. However I found
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that jffs2 filesystem can be created only on top of a ubi volume. I tried
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to create jffs2 directly on mtd device but pages with clean markers are
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became uncorrectable.
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This patch also includes changes that I sent earlier.
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Best regards,
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Kirill.
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Signed-off-by: Kirill Berezin (fyiwdt@gmail.com)
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diff -urNb a/drivers/mtd/nand/mtk_nand.c b/drivers/mtd/nand/mtk_nand.c
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--- a/drivers/mtd/nand/mtk_nand.c 2015-11-06 16:44:31.000000000 +0400
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+++ b/drivers/mtd/nand/mtk_nand.c 2015-11-12 10:06:20.080430855 +0400
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@@ -110,6 +110,10 @@
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int manu_id;
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int dev_id;
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+/* this constant was taken from linux/nand/nand.h v 3.14
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+ * in later versions it seems it was removed in order to save a bit of space
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+ */
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+#define NAND_MAX_OOBSIZE 774
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static u8 local_oob_buf[NAND_MAX_OOBSIZE];
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static u8 nand_badblock_offset = 0;
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@@ -348,7 +352,7 @@
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if (0xF == u4ErrNum) {
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mtd->ecc_stats.failed++;
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bRet = false;
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- //printk(KERN_ERR"UnCorrectable at PageAddr=%d\n", u4PageAddr);
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+ printk(KERN_ERR"mtk_nand: UnCorrectable at PageAddr=%d\n", u4PageAddr);
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} else {
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for (i = 0; i < ((u4ErrNum + 1) >> 1); ++i) {
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au4ErrBitLoc[i] = DRV_Reg32(ECC_DECEL0_REG32 + i);
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@@ -1422,7 +1426,7 @@
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{
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struct nand_chip *chip = (struct nand_chip *)mtd->priv;
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- chip->erase_cmd(mtd, page);
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+ chip->erase(mtd, page);
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return chip->waitfunc(mtd, chip);
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}
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@@ -2094,8 +2098,8 @@
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nand_chip->write_page = mtk_nand_write_page;
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nand_chip->ecc.write_oob = mtk_nand_write_oob;
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nand_chip->block_markbad = mtk_nand_block_markbad; // need to add nand_get_device()/nand_release_device().
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- // nand_chip->erase = mtk_nand_erase;
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- // nand_chip->read_page = mtk_nand_read_page;
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+ nand_chip->erase_mtk = mtk_nand_erase;
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+ nand_chip->read_page = mtk_nand_read_page;
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nand_chip->ecc.read_oob = mtk_nand_read_oob;
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nand_chip->block_bad = mtk_nand_block_bad;
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@@ -2175,6 +2179,21 @@
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nand_chip->pagemask = (nand_chip->chipsize >> nand_chip->page_shift) - 1;
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nand_chip->phys_erase_shift = ffs(mtd->erasesize) - 1;
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nand_chip->chip_shift = ffs(nand_chip->chipsize) - 1;//0x1C;//ffs(nand_chip->chipsize) - 1;
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+
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+ /* allocate buffers or call select_chip here or a bit earlier*/
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+ {
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+ struct nand_buffers *nbuf = kzalloc(sizeof(*nbuf) + mtd->writesize + mtd->oobsize * 3, GFP_KERNEL);
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+ if (!nbuf) {
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+ return -ENOMEM;
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+ }
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+ nbuf->ecccalc = (uint8_t *)(nbuf + 1);
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+ nbuf->ecccode = nbuf->ecccalc + mtd->oobsize;
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+ nbuf->databuf = nbuf->ecccode + mtd->oobsize;
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+
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+ nand_chip->buffers = nbuf;
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+ nand_chip->options |= NAND_OWN_BUFFERS;
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+ }
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+
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nand_chip->oob_poi = nand_chip->buffers->databuf + mtd->writesize;
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nand_chip->badblockpos = 0;
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@@ -2251,6 +2270,9 @@
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MSG(INIT, "[NFI] mtk_nand_probe fail, err = %d!\n", err);
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nand_release(mtd);
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platform_set_drvdata(pdev, NULL);
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+ if ( NULL != nand_chip->buffers) {
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+ kfree(nand_chip->buffers);
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+ }
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kfree(host);
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nand_disable_clock();
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return err;
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@@ -2261,8 +2283,12 @@
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{
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struct mtk_nand_host *host = platform_get_drvdata(pdev);
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struct mtd_info *mtd = &host->mtd;
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+ struct nand_chip *nand_chip = &host->nand_chip;
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nand_release(mtd);
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+ if ( NULL != nand_chip->buffers) {
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+ kfree(nand_chip->buffers);
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+ }
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kfree(host);
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nand_disable_clock();
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diff -urNb a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
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--- a/drivers/mtd/nand/nand_base.c 2015-11-06 16:44:31.000000000 +0400
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+++ b/drivers/mtd/nand/nand_base.c 2015-11-09 10:24:52.931720862 +0400
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@@ -1575,6 +1575,9 @@
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__func__, buf);
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read_retry:
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+#ifdef CONFIG_MTK_MTD_NAND
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+ ret = chip->read_page(mtd, chip, bufpoi, page);
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+#else
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chip->cmdfunc(mtd, NAND_CMD_READ0, 0x00, page);
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/*
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@@ -1593,6 +1596,7 @@
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else
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ret = chip->ecc.read_page(mtd, chip, bufpoi,
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oob_required, page);
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+#endif /* CONFIG_MTK_MTD_NAND */
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if (ret < 0) {
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if (use_bufpoi)
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/* Invalidate page cache */
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@@ -2770,8 +2774,11 @@
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if (page <= chip->pagebuf && chip->pagebuf <
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(page + pages_per_block))
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chip->pagebuf = -1;
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-
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+#ifdef CONFIG_MTK_MTD_NAND
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+ status = chip->erase_mtk(mtd, page & chip->pagemask);
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+#else
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status = chip->erase(mtd, page & chip->pagemask);
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+#endif /* CONFIG_MTK_MTD_NAND */
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/*
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* See if operation failed and additional status checks are
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diff -urNb a/drivers/mtd/nand/nand_device_list.h b/drivers/mtd/nand/nand_device_list.h
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--- a/drivers/mtd/nand/nand_device_list.h 2015-11-06 16:44:31.000000000 +0400
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+++ b/drivers/mtd/nand/nand_device_list.h 2015-11-06 11:13:26.000000000 +0400
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@@ -43,6 +43,8 @@
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{0xADBC, 0x905554, 5, 16, 512, 128, 2048, 64, 0x10801011, "H9DA4GH4JJAMC", 0},
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{0x01F1, 0x801D01, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "S34ML01G100TF", 0},
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{0x92F1, 0x8095FF, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "F59L1G81A", 0},
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+ {0xC8DA, 0x909544, 5, 8, 256, 128, 2048, 64, 0x30C77fff, "F59L2G81A", 0},
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+ {0xC8DC, 0x909554, 5, 8, 512, 128, 2048, 64, 0x30C77fff, "F59L4G81A", 0},
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{0xECD3, 0x519558, 5, 8, 1024, 128, 2048, 64, 0x44333, "K9K8G8000", 0},
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{0xC2F1, 0x801DC2, 4, 8, 128, 128, 2048, 64, 0x30C77fff, "MX30LF1G08AA", 0},
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{0x98D3, 0x902676, 5, 8, 1024, 256, 4096, 224, 0x00C25332, "TC58NVG3S0F", 0},
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diff -urNb a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h
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--- a/include/linux/mtd/nand.h 2015-11-06 16:44:30.000000000 +0400
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+++ b/include/linux/mtd/nand.h 2015-11-09 10:18:55.704701886 +0400
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@@ -653,6 +653,10 @@
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int (*write_page)(struct mtd_info *mtd, struct nand_chip *chip,
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uint32_t offset, int data_len, const uint8_t *buf,
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int oob_required, int page, int cached, int raw);
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+#ifdef CONFIG_MTK_MTD_NAND
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+ int (*read_page)(struct mtd_info *mtd, struct nand_chip *chip, u8 *buf, int page);
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+ int (*erase_mtk)(struct mtd_info *mtd, int page);
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+#endif /* CONFIG_MTK_MTD_NAND */
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int (*onfi_set_features)(struct mtd_info *mtd, struct nand_chip *chip,
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int feature_addr, uint8_t *subfeature_para);
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int (*onfi_get_features)(struct mtd_info *mtd, struct nand_chip *chip,
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