mxc_nand: fix correct_data function

The v2 controller has a totally different mechanism to check
whether the data we read had ecc errors or not. Implement this.
The mechanism in the v2 controller happens to be identical to
the v3 controller.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 40 insertions, 2 deletions

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 6d0fa4cd1ddf..f5fd25461a09 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -94,6 +94,7 @@ struct mxc_nand_host {
         struct clk              *clk;
         int                     clk_act;
         int                     irq;
+        int                     eccsize;
 
         wait_queue_head_t       irq_waitq;
 
@@ -342,7 +343,7 @@ static void mxc_nand_enable_hwecc(struct mtd_info *mtd, int mode)
          */
 }
 
-static int mxc_nand_correct_data(struct mtd_info *mtd, u_char *dat,
+static int mxc_nand_correct_data_v1(struct mtd_info *mtd, u_char *dat,
                                  u_char *read_ecc, u_char *calc_ecc)
 {
         struct nand_chip *nand_chip = mtd->priv;
@@ -364,6 +365,40 @@ static int mxc_nand_correct_data(struct mtd_info *mtd, u_char *dat,
         return 0;
 }
 
+static int mxc_nand_correct_data_v2_v3(struct mtd_info *mtd, u_char *dat,
+                                 u_char *read_ecc, u_char *calc_ecc)
+{
+        struct nand_chip *nand_chip = mtd->priv;
+        struct mxc_nand_host *host = nand_chip->priv;
+        u32 ecc_stat, err;
+        int no_subpages = 1;
+        int ret = 0;
+        u8 ecc_bit_mask, err_limit;
+
+        ecc_bit_mask = (host->eccsize == 4) ? 0x7 : 0xf;
+        err_limit = (host->eccsize == 4) ? 0x4 : 0x8;
+
+        no_subpages = mtd->writesize >> 9;
+
+        ecc_stat = readl(NFC_V1_V2_ECC_STATUS_RESULT);
+
+        do {
+                err = ecc_stat & ecc_bit_mask;
+                if (err > err_limit) {
+                        printk(KERN_WARNING "UnCorrectable RS-ECC Error\n");
+                        return -1;
+                } else {
+                        ret += err;
+                }
+                ecc_stat >>= 4;
+        } while (--no_subpages);
+
+        mtd->ecc_stats.corrected += ret;
+        pr_debug("%d Symbol Correctable RS-ECC Error\n", ret);
+
+        return ret;
+}
+
 static int mxc_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
                                   u_char *ecc_code)
 {
@@ -790,7 +825,10 @@ static int __init mxcnd_probe(struct platform_device *pdev)
         if (pdata->hw_ecc) {
                 this->ecc.calculate = mxc_nand_calculate_ecc;
                 this->ecc.hwctl = mxc_nand_enable_hwecc;
-                this->ecc.correct = mxc_nand_correct_data;
+                if (nfc_is_v1())
+                        this->ecc.correct = mxc_nand_correct_data_v1;
+                else
+                        this->ecc.correct = mxc_nand_correct_data_v2_v3;
                 this->ecc.mode = NAND_ECC_HW;
         } else {
                 this->ecc.mode = NAND_ECC_SOFT;