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path: root/drivers/mtd/nand/bcm_umi_bch.c
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Diffstat (limited to 'drivers/mtd/nand/bcm_umi_bch.c')
-rw-r--r--drivers/mtd/nand/bcm_umi_bch.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/mtd/nand/bcm_umi_bch.c b/drivers/mtd/nand/bcm_umi_bch.c
new file mode 100644
index 00000000..a930666d
--- /dev/null
+++ b/drivers/mtd/nand/bcm_umi_bch.c
@@ -0,0 +1,213 @@
+/*****************************************************************************
+* Copyright 2004 - 2009 Broadcom Corporation. All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+
+/* ---- Include Files ---------------------------------------------------- */
+#include "nand_bcm_umi.h"
+
+/* ---- External Variable Declarations ----------------------------------- */
+/* ---- External Function Prototypes ------------------------------------- */
+/* ---- Public Variables ------------------------------------------------- */
+/* ---- Private Constants and Types -------------------------------------- */
+
+/* ---- Private Function Prototypes -------------------------------------- */
+static int bcm_umi_bch_read_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, uint8_t *buf, int page);
+static void bcm_umi_bch_write_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, const uint8_t *buf);
+
+/* ---- Private Variables ------------------------------------------------ */
+
+/*
+** nand_hw_eccoob
+** New oob placement block for use with hardware ecc generation.
+*/
+static struct nand_ecclayout nand_hw_eccoob_512 = {
+ /* Reserve 5 for BI indicator */
+ .oobfree = {
+#if (NAND_ECC_NUM_BYTES > 3)
+ {.offset = 0, .length = 2}
+#else
+ {.offset = 0, .length = 5},
+ {.offset = 6, .length = 7}
+#endif
+ }
+};
+
+/*
+** We treat the OOB for a 2K page as if it were 4 512 byte oobs,
+** except the BI is at byte 0.
+*/
+static struct nand_ecclayout nand_hw_eccoob_2048 = {
+ /* Reserve 0 as BI indicator */
+ .oobfree = {
+#if (NAND_ECC_NUM_BYTES > 10)
+ {.offset = 1, .length = 2},
+#elif (NAND_ECC_NUM_BYTES > 7)
+ {.offset = 1, .length = 5},
+ {.offset = 16, .length = 6},
+ {.offset = 32, .length = 6},
+ {.offset = 48, .length = 6}
+#else
+ {.offset = 1, .length = 8},
+ {.offset = 16, .length = 9},
+ {.offset = 32, .length = 9},
+ {.offset = 48, .length = 9}
+#endif
+ }
+};
+
+/* We treat the OOB for a 4K page as if it were 8 512 byte oobs,
+ * except the BI is at byte 0. */
+static struct nand_ecclayout nand_hw_eccoob_4096 = {
+ /* Reserve 0 as BI indicator */
+ .oobfree = {
+#if (NAND_ECC_NUM_BYTES > 10)
+ {.offset = 1, .length = 2},
+ {.offset = 16, .length = 3},
+ {.offset = 32, .length = 3},
+ {.offset = 48, .length = 3},
+ {.offset = 64, .length = 3},
+ {.offset = 80, .length = 3},
+ {.offset = 96, .length = 3},
+ {.offset = 112, .length = 3}
+#else
+ {.offset = 1, .length = 5},
+ {.offset = 16, .length = 6},
+ {.offset = 32, .length = 6},
+ {.offset = 48, .length = 6},
+ {.offset = 64, .length = 6},
+ {.offset = 80, .length = 6},
+ {.offset = 96, .length = 6},
+ {.offset = 112, .length = 6}
+#endif
+ }
+};
+
+/* ---- Private Functions ------------------------------------------------ */
+/* ==== Public Functions ================================================= */
+
+/****************************************************************************
+*
+* bcm_umi_bch_read_page_hwecc - hardware ecc based page read function
+* @mtd: mtd info structure
+* @chip: nand chip info structure
+* @buf: buffer to store read data
+*
+***************************************************************************/
+static int bcm_umi_bch_read_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, uint8_t * buf,
+ int page)
+{
+ int sectorIdx = 0;
+ int eccsize = chip->ecc.size;
+ int eccsteps = chip->ecc.steps;
+ uint8_t *datap = buf;
+ uint8_t eccCalc[NAND_ECC_NUM_BYTES];
+ int sectorOobSize = mtd->oobsize / eccsteps;
+ int stat;
+
+ for (sectorIdx = 0; sectorIdx < eccsteps;
+ sectorIdx++, datap += eccsize) {
+ if (sectorIdx > 0) {
+ /* Seek to page location within sector */
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, sectorIdx * eccsize,
+ -1);
+ }
+
+ /* Enable hardware ECC before reading the buf */
+ nand_bcm_umi_bch_enable_read_hwecc();
+
+ /* Read in data */
+ bcm_umi_nand_read_buf(mtd, datap, eccsize);
+
+ /* Pause hardware ECC after reading the buf */
+ nand_bcm_umi_bch_pause_read_ecc_calc();
+
+ /* Read the OOB ECC */
+ chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
+ mtd->writesize + sectorIdx * sectorOobSize, -1);
+ nand_bcm_umi_bch_read_oobEcc(mtd->writesize, eccCalc,
+ NAND_ECC_NUM_BYTES,
+ chip->oob_poi +
+ sectorIdx * sectorOobSize);
+
+ /* Correct any ECC detected errors */
+ stat =
+ nand_bcm_umi_bch_correct_page(datap, eccCalc,
+ NAND_ECC_NUM_BYTES);
+
+ /* Update Stats */
+ if (stat < 0) {
+#if defined(NAND_BCM_UMI_DEBUG)
+ printk(KERN_WARNING "%s uncorr_err sectorIdx=%d\n",
+ __func__, sectorIdx);
+ printk(KERN_WARNING
+ "%s data %02x %02x %02x %02x "
+ "%02x %02x %02x %02x\n",
+ __func__, datap[0], datap[1], datap[2], datap[3],
+ datap[4], datap[5], datap[6], datap[7]);
+ printk(KERN_WARNING
+ "%s ecc %02x %02x %02x %02x "
+ "%02x %02x %02x %02x %02x %02x "
+ "%02x %02x %02x\n",
+ __func__, eccCalc[0], eccCalc[1], eccCalc[2],
+ eccCalc[3], eccCalc[4], eccCalc[5], eccCalc[6],
+ eccCalc[7], eccCalc[8], eccCalc[9], eccCalc[10],
+ eccCalc[11], eccCalc[12]);
+ BUG();
+#endif
+ mtd->ecc_stats.failed++;
+ } else {
+#if defined(NAND_BCM_UMI_DEBUG)
+ if (stat > 0) {
+ printk(KERN_INFO
+ "%s %d correctable_errors detected\n",
+ __func__, stat);
+ }
+#endif
+ mtd->ecc_stats.corrected += stat;
+ }
+ }
+ return 0;
+}
+
+/****************************************************************************
+*
+* bcm_umi_bch_write_page_hwecc - hardware ecc based page write function
+* @mtd: mtd info structure
+* @chip: nand chip info structure
+* @buf: data buffer
+*
+***************************************************************************/
+static void bcm_umi_bch_write_page_hwecc(struct mtd_info *mtd,
+ struct nand_chip *chip, const uint8_t *buf)
+{
+ int sectorIdx = 0;
+ int eccsize = chip->ecc.size;
+ int eccsteps = chip->ecc.steps;
+ const uint8_t *datap = buf;
+ uint8_t *oobp = chip->oob_poi;
+ int sectorOobSize = mtd->oobsize / eccsteps;
+
+ for (sectorIdx = 0; sectorIdx < eccsteps;
+ sectorIdx++, datap += eccsize, oobp += sectorOobSize) {
+ /* Enable hardware ECC before writing the buf */
+ nand_bcm_umi_bch_enable_write_hwecc();
+ bcm_umi_nand_write_buf(mtd, datap, eccsize);
+ nand_bcm_umi_bch_write_oobEcc(mtd->writesize, oobp,
+ NAND_ECC_NUM_BYTES);
+ }
+
+ bcm_umi_nand_write_buf(mtd, chip->oob_poi, mtd->oobsize);
+}
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