diff options
| author | Pekon Gupta <pekon@ti.com> | 2014-03-20 18:48:34 +0530 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2014-03-25 23:08:52 -0700 |
| commit | 3f4eb14bdbe148fcc3a8e02f506ccc9b8c955ad4 (patch) | |
| tree | eff0b8120b1a9d7c21cb97bbde936fa3e829228d /drivers/mtd/nand | |
| parent | d9ba46d32c0edc5207fec424230dfa786a24a117 (diff) | |
mtd: devices: elm: check for hardware engine's design constraints
ELM hardware engine is used by BCH ecc-schemes for detecting and locating ECC
errors. This patch adds the following checks for ELM hardware engine:
- ELM internal buffers are of 1K,
so it cannot process data with ecc-step-size > 1K.
- ELM engine can execute upto maximum of 8 threads in parallel,
so in *page-mode* (when complete page is processed in single iteration),
ELM cannot support ecc-steps > 8.
Signed-off-by: Pekon Gupta <pekon@ti.com>
Reviewed-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd/nand')
| -rw-r--r-- | drivers/mtd/nand/omap2.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c index ab9c472456d..6f9b339aed7 100644 --- a/drivers/mtd/nand/omap2.c +++ b/drivers/mtd/nand/omap2.c @@ -1540,6 +1540,8 @@ static int is_elm_present(struct omap_nand_info *info, struct device_node *elm_node, enum bch_ecc bch_type) { struct platform_device *pdev; + struct nand_ecc_ctrl *ecc = &info->nand.ecc; + int err; /* check whether elm-id is passed via DT */ if (!elm_node) { pr_err("nand: error: ELM DT node not found\n"); @@ -1553,9 +1555,10 @@ static int is_elm_present(struct omap_nand_info *info, } /* ELM module available, now configure it */ info->elm_dev = &pdev->dev; - if (elm_config(info->elm_dev, bch_type)) - return -ENODEV; - return 0; + err = elm_config(info->elm_dev, bch_type, + (info->mtd.writesize / ecc->size), ecc->size, ecc->bytes); + + return err; } #endif /* CONFIG_MTD_NAND_ECC_BCH */ |