[MTD] [NAND] Hardware ECC controller on at91sam9263 / at91sam9260

This is a patch to use the hardware ECC controller of
the AT91SAM9260 and AT91SAM9263 for the AT91 nand.
On AT91 NAND, there's now a choice between ECC soft,
ECC hard or no ECC (for debug).

It has been tested on AT91SAM9263 with 8 bits large
and small page NAND.

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

2 files changed, 397 insertions, 5 deletions

diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index dcbb0decd46..5076faf9ca6 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -278,6 +278,47 @@ config MTD_NAND_AT91
         help
           Enables support for NAND Flash / Smart Media Card interface
           on Atmel AT91 processors.
+choice
+        prompt "ECC management for NAND Flash / SmartMedia on AT91"
+        depends on MTD_NAND_AT91
+
+config MTD_NAND_AT91_ECC_HW
+        bool "Hardware ECC"
+        depends on ARCH_AT91SAM9263 || ARCH_AT91SAM9260
+        help
+          Uses hardware ECC provided by the at91sam9260/at91sam9263 chip
+          instead of software ECC.
+          The hardware ECC controller is capable of single bit error
+          correction and 2-bit random detection per page.
+
+          NB : hardware and software ECC schemes are incompatible.
+          If you switch from one to another, you'll have to erase your
+          mtd partition.
+
+          If unsure, say Y
+
+config MTD_NAND_AT91_ECC_SOFT
+        bool "Software ECC"
+        help
+          Uses software ECC.
+
+          NB : hardware and software ECC schemes are incompatible.
+          If you switch from one to another, you'll have to erase your
+          mtd partition.
+
+config MTD_NAND_AT91_ECC_NONE
+        bool "No ECC (testing only, DANGEROUS)"
+        depends on DEBUG_KERNEL
+        help
+          No ECC will be used.
+          It's not a good idea and it should be reserved for testing
+          purpose only.
+
+          If unsure, say N
+
+          endchoice
+
+endchoice
 
 config MTD_NAND_PXA3xx
         bool "Support for NAND flash devices on PXA3xx"
diff --git a/drivers/mtd/nand/at91_nand.c b/drivers/mtd/nand/at91_nand.c
index 463632ed794..c3eb203a2ad 100644
--- a/drivers/mtd/nand/at91_nand.c
+++ b/drivers/mtd/nand/at91_nand.c
@@ -9,6 +9,15 @@
  *  Derived from drivers/mtd/spia.c
  *       Copyright (C) 2000 Steven J. Hill (sjhill@cotw.com)
  *
+ *
+ *  Add Hardware ECC support for AT91SAM9260 / AT91SAM9263
+ *     Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright (C) 2007
+ *
+ *     Derived from Das U-Boot source code
+ *              (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c)
+ *     (C) Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas
+ *
+ *
  * 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.
@@ -29,11 +38,59 @@
 #include <asm/arch/board.h>
 #include <asm/arch/gpio.h>
 
+#ifdef CONFIG_MTD_NAND_AT91_ECC_HW
+#define hard_ecc        1
+#else
+#define hard_ecc        0
+#endif
+
+#ifdef CONFIG_MTD_NAND_AT91_ECC_NONE
+#define no_ecc          1
+#else
+#define no_ecc          0
+#endif
+
+/* Register access macros */
+#define ecc_readl(add, reg)                             \
+        __raw_readl(add + AT91_ECC_##reg)
+#define ecc_writel(add, reg, value)                     \
+        __raw_writel((value), add + AT91_ECC_##reg)
+
+#include <asm/arch/at91_ecc.h> /* AT91SAM9260/3 ECC registers */
+
+/* oob layout for large page size
+ * bad block info is on bytes 0 and 1
+ * the bytes have to be consecutives to avoid
+ * several NAND_CMD_RNDOUT during read
+ */
+static struct nand_ecclayout at91_oobinfo_large = {
+        .eccbytes = 4,
+        .eccpos = {60, 61, 62, 63},
+        .oobfree = {
+                {2, 58}
+        },
+};
+
+/* oob layout for small page size
+ * bad block info is on bytes 4 and 5
+ * the bytes have to be consecutives to avoid
+ * several NAND_CMD_RNDOUT during read
+ */
+static struct nand_ecclayout at91_oobinfo_small = {
+        .eccbytes = 4,
+        .eccpos = {0, 1, 2, 3},
+        .oobfree = {
+                {6, 10}
+        },
+};
+
 struct at91_nand_host {
         struct nand_chip        nand_chip;
         struct mtd_info         mtd;
         void __iomem            *io_base;
         struct at91_nand_data   *board;
+        struct device           *dev;
+        void __iomem            *ecc;
 };
 
 /*
@@ -82,6 +139,215 @@ static void at91_nand_disable(struct at91_nand_host *host)
                 at91_set_gpio_value(host->board->enable_pin, 1);
 }
 
+/*
+ * write oob for small pages
+ */
+static int at91_nand_write_oob_512(struct mtd_info *mtd,
+                struct nand_chip *chip, int page)
+{
+        int chunk = chip->ecc.bytes + chip->ecc.prepad + chip->ecc.postpad;
+        int eccsize = chip->ecc.size, length = mtd->oobsize;
+        int len, pos, status = 0;
+        const uint8_t *bufpoi = chip->oob_poi;
+
+        pos = eccsize + chunk;
+
+        chip->cmdfunc(mtd, NAND_CMD_SEQIN, pos, page);
+        len = min_t(int, length, chunk);
+        chip->write_buf(mtd, bufpoi, len);
+        bufpoi += len;
+        length -= len;
+        if (length > 0)
+                chip->write_buf(mtd, bufpoi, length);
+
+        chip->cmdfunc(mtd, NAND_CMD_PAGEPROG, -1, -1);
+        status = chip->waitfunc(mtd, chip);
+
+        return status & NAND_STATUS_FAIL ? -EIO : 0;
+
+}
+
+/*
+ * read oob for small pages
+ */
+static int at91_nand_read_oob_512(struct mtd_info *mtd,
+                struct nand_chip *chip, int page, int sndcmd)
+{
+        if (sndcmd) {
+                chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+                sndcmd = 0;
+        }
+        chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+        return sndcmd;
+}
+
+/*
+ * Calculate HW ECC
+ *
+ * function called after a write
+ *
+ * mtd:        MTD block structure
+ * dat:        raw data (unused)
+ * ecc_code:   buffer for ECC
+ */
+static int at91_nand_calculate(struct mtd_info *mtd,
+                const u_char *dat, unsigned char *ecc_code)
+{
+        struct nand_chip *nand_chip = mtd->priv;
+        struct at91_nand_host *host = nand_chip->priv;
+        uint32_t *eccpos = nand_chip->ecc.layout->eccpos;
+        unsigned int ecc_value;
+
+        /* get the first 2 ECC bytes */
+        ecc_value = ecc_readl(host->ecc, PR) & AT91_ECC_PARITY;
+
+        ecc_code[eccpos[0]] = ecc_value & 0xFF;
+        ecc_code[eccpos[1]] = (ecc_value >> 8) & 0xFF;
+
+        /* get the last 2 ECC bytes */
+        ecc_value = ecc_readl(host->ecc, NPR) & AT91_ECC_NPARITY;
+
+        ecc_code[eccpos[2]] = ecc_value & 0xFF;
+        ecc_code[eccpos[3]] = (ecc_value >> 8) & 0xFF;
+
+        return 0;
+}
+
+/*
+ * HW ECC read page function
+ *
+ * mtd:        mtd info structure
+ * chip:       nand chip info structure
+ * buf:        buffer to store read data
+ */
+static int at91_nand_read_page(struct mtd_info *mtd,
+                struct nand_chip *chip, uint8_t *buf)
+{
+        int eccsize = chip->ecc.size;
+        int eccbytes = chip->ecc.bytes;
+        uint32_t *eccpos = chip->ecc.layout->eccpos;
+        uint8_t *p = buf;
+        uint8_t *oob = chip->oob_poi;
+        uint8_t *ecc_pos;
+        int stat;
+
+        /* read the page */
+        chip->read_buf(mtd, p, eccsize);
+
+        /* move to ECC position if needed */
+        if (eccpos[0] != 0) {
+                /* This only works on large pages
+                 * because the ECC controller waits for
+                 * NAND_CMD_RNDOUTSTART after the
+                 * NAND_CMD_RNDOUT.
+                 * anyway, for small pages, the eccpos[0] == 0
+                 */
+                chip->cmdfunc(mtd, NAND_CMD_RNDOUT,
+                                mtd->writesize + eccpos[0], -1);
+        }
+
+        /* the ECC controller needs to read the ECC just after the data */
+        ecc_pos = oob + eccpos[0];
+        chip->read_buf(mtd, ecc_pos, eccbytes);
+
+        /* check if there's an error */
+        stat = chip->ecc.correct(mtd, p, oob, NULL);
+
+        if (stat < 0)
+                mtd->ecc_stats.failed++;
+        else
+                mtd->ecc_stats.corrected += stat;
+
+        /* get back to oob start (end of page) */
+        chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1);
+
+        /* read the oob */
+        chip->read_buf(mtd, oob, mtd->oobsize);
+
+        return 0;
+}
+
+/*
+ * HW ECC Correction
+ *
+ * function called after a read
+ *
+ * mtd:        MTD block structure
+ * dat:        raw data read from the chip
+ * read_ecc:   ECC from the chip (unused)
+ * isnull:     unused
+ *
+ * Detect and correct a 1 bit error for a page
+ */
+static int at91_nand_correct(struct mtd_info *mtd, u_char *dat,
+                u_char *read_ecc, u_char *isnull)
+{
+        struct nand_chip *nand_chip = mtd->priv;
+        struct at91_nand_host *host = nand_chip->priv;
+        unsigned int ecc_status;
+        unsigned int ecc_word, ecc_bit;
+
+        /* get the status from the Status Register */
+        ecc_status = ecc_readl(host->ecc, SR);
+
+        /* if there's no error */
+        if (likely(!(ecc_status & AT91_ECC_RECERR)))
+                return 0;
+
+        /* get error bit offset (4 bits) */
+        ecc_bit = ecc_readl(host->ecc, PR) & AT91_ECC_BITADDR;
+        /* get word address (12 bits) */
+        ecc_word = ecc_readl(host->ecc, PR) & AT91_ECC_WORDADDR;
+        ecc_word >>= 4;
+
+        /* if there are multiple errors */
+        if (ecc_status & AT91_ECC_MULERR) {
+                /* check if it is a freshly erased block
+                 * (filled with 0xff) */
+                if ((ecc_bit == AT91_ECC_BITADDR)
+                                && (ecc_word == (AT91_ECC_WORDADDR >> 4))) {
+                        /* the block has just been erased, return OK */
+                        return 0;
+                }
+                /* it doesn't seems to be a freshly
+                 * erased block.
+                 * We can't correct so many errors */
+                dev_dbg(host->dev, "at91_nand : multiple errors detected."
+                                " Unable to correct.\n");
+                return -EIO;
+        }
+
+        /* if there's a single bit error : we can correct it */
+        if (ecc_status & AT91_ECC_ECCERR) {
+                /* there's nothing much to do here.
+                 * the bit error is on the ECC itself.
+                 */
+                dev_dbg(host->dev, "at91_nand : one bit error on ECC code."
+                                " Nothing to correct\n");
+                return 0;
+        }
+
+        dev_dbg(host->dev, "at91_nand : one bit error on data."
+                        " (word offset in the page :"
+                        " 0x%x bit offset : 0x%x)\n",
+                        ecc_word, ecc_bit);
+        /* correct the error */
+        if (nand_chip->options & NAND_BUSWIDTH_16) {
+                /* 16 bits words */
+                ((unsigned short *) dat)[ecc_word] ^= (1 << ecc_bit);
+        } else {
+                /* 8 bits words */
+                dat[ecc_word] ^= (1 << ecc_bit);
+        }
+        dev_dbg(host->dev, "at91_nand : error corrected\n");
+        return 1;
+}
+
+/*
+ * Enable HW ECC : unsused
+ */
+static void at91_nand_hwctl(struct mtd_info *mtd, int mode) { ; }
+
 #ifdef CONFIG_MTD_PARTITIONS
 static const char *part_probes[] = { "cmdlinepart", NULL };
 #endif
@@ -94,6 +360,8 @@ static int __init at91_nand_probe(struct platform_device *pdev)
         struct at91_nand_host *host;
         struct mtd_info *mtd;
         struct nand_chip *nand_chip;
+        struct resource *regs;
+        struct resource *mem;
         int res;
 
 #ifdef CONFIG_MTD_PARTITIONS
@@ -108,8 +376,13 @@ static int __init at91_nand_probe(struct platform_device *pdev)
                 return -ENOMEM;
         }
 
-        host->io_base = ioremap(pdev->resource[0].start,
-                                pdev->resource[0].end - pdev->resource[0].start + 1);
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem) {
+                printk(KERN_ERR "at91_nand: can't get I/O resource mem\n");
+                return -ENXIO;
+        }
+
+        host->io_base = ioremap(mem->start, mem->end - mem->start + 1);
         if (host->io_base == NULL) {
                 printk(KERN_ERR "at91_nand: ioremap failed\n");
                 kfree(host);
@@ -119,6 +392,7 @@ static int __init at91_nand_probe(struct platform_device *pdev)
         mtd = &host->mtd;
         nand_chip = &host->nand_chip;
         host->board = pdev->dev.platform_data;
+        host->dev = &pdev->dev;
 
         nand_chip->priv = host;         /* link the private data structures */
         mtd->priv = nand_chip;
@@ -132,7 +406,32 @@ static int __init at91_nand_probe(struct platform_device *pdev)
         if (host->board->rdy_pin)
                 nand_chip->dev_ready = at91_nand_device_ready;
 
+        regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        if (!regs && hard_ecc) {
+                printk(KERN_ERR "at91_nand: can't get I/O resource "
+                                "regs\nFalling back on software ECC\n");
+        }
+
         nand_chip->ecc.mode = NAND_ECC_SOFT;    /* enable ECC */
+        if (no_ecc)
+                nand_chip->ecc.mode = NAND_ECC_NONE;
+        if (hard_ecc && regs) {
+                host->ecc = ioremap(regs->start, regs->end - regs->start + 1);
+                if (host->ecc == NULL) {
+                        printk(KERN_ERR "at91_nand: ioremap failed\n");
+                        res = -EIO;
+                        goto err_ecc_ioremap;
+                }
+                nand_chip->ecc.mode = NAND_ECC_HW_SYNDROME;
+                nand_chip->ecc.calculate = at91_nand_calculate;
+                nand_chip->ecc.correct = at91_nand_correct;
+                nand_chip->ecc.hwctl = at91_nand_hwctl;
+                nand_chip->ecc.read_page = at91_nand_read_page;
+                nand_chip->ecc.bytes = 4;
+                nand_chip->ecc.prepad = 0;
+                nand_chip->ecc.postpad = 0;
+        }
+
         nand_chip->chip_delay = 20;             /* 20us command delay time */
 
         if (host->board->bus_width_16)          /* 16-bit bus width */
@@ -149,8 +448,53 @@ static int __init at91_nand_probe(struct platform_device *pdev)
                 }
         }
 
-        /* Scan to find existance of the device */
-        if (nand_scan(mtd, 1)) {
+        /* first scan to find the device and get the page size */
+        if (nand_scan_ident(mtd, 1)) {
+                res = -ENXIO;
+                goto out;
+        }
+
+        if (nand_chip->ecc.mode == NAND_ECC_HW_SYNDROME) {
+                /* ECC is calculated for the whole page (1 step) */
+                nand_chip->ecc.size = mtd->writesize;
+
+                /* set ECC page size and oob layout */
+                switch (mtd->writesize) {
+                case 512:
+                        nand_chip->ecc.layout = &at91_oobinfo_small;
+                        nand_chip->ecc.read_oob = at91_nand_read_oob_512;
+                        nand_chip->ecc.write_oob = at91_nand_write_oob_512;
+                        ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_528);
+                        break;
+                case 1024:
+                        nand_chip->ecc.layout = &at91_oobinfo_large;
+                        ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_1056);
+                        break;
+                case 2048:
+                        nand_chip->ecc.layout = &at91_oobinfo_large;
+                        ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_2112);
+                        break;
+                case 4096:
+                        nand_chip->ecc.layout = &at91_oobinfo_large;
+                        ecc_writel(host->ecc, MR, AT91_ECC_PAGESIZE_4224);
+                        break;
+                default:
+                        /* page size not handled by HW ECC */
+                        /* switching back to soft ECC */
+                        nand_chip->ecc.mode = NAND_ECC_SOFT;
+                        nand_chip->ecc.calculate = NULL;
+                        nand_chip->ecc.correct = NULL;
+                        nand_chip->ecc.hwctl = NULL;
+                        nand_chip->ecc.read_page = NULL;
+                        nand_chip->ecc.postpad = 0;
+                        nand_chip->ecc.prepad = 0;
+                        nand_chip->ecc.bytes = 0;
+                        break;
+                }
+        }
+
+        /* second phase scan */
+        if (nand_scan_tail(mtd)) {
                 res = -ENXIO;
                 goto out;
         }
@@ -179,9 +523,15 @@ static int __init at91_nand_probe(struct platform_device *pdev)
         if (!res)
                 return res;
 
+#ifdef CONFIG_MTD_PARTITIONS
 release:
+#endif
         nand_release(mtd);
+
 out:
+        iounmap(host->ecc);
+
+err_ecc_ioremap:
         at91_nand_disable(host);
         platform_set_drvdata(pdev, NULL);
         iounmap(host->io_base);
@@ -202,6 +552,7 @@ static int __devexit at91_nand_remove(struct platform_device *pdev)
         at91_nand_disable(host);
 
         iounmap(host->io_base);
+        iounmap(host->ecc);
         kfree(host);
 
         return 0;
@@ -233,5 +584,5 @@ module_exit(at91_nand_exit);
 
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Rick Bronson");
-MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91RM9200");
+MODULE_DESCRIPTION("NAND/SmartMedia driver for AT91RM9200 / AT91SAM9");
 MODULE_ALIAS("platform:at91_nand");