mtd: nand: omap: add support for BCH16_ECC - GPMC driver updates

This patch add support for BCH16_ECC in GPMC (controller) driver:
- extends configuration space to include BCH16 registers
- extends parsing of DT binding for selecting BCH16 ecc-scheme

Signed-off-by: Pekon Gupta <pekon@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c
index ab43755364f5a7c06ecfc367c0f055d65876dc54..9b27773db0405f1fb2d331f8ef95942bf60e0f99 100644 (file)
--- a/arch/arm/mach-omap2/gpmc.c
+++ b/arch/arm/mach-omap2/gpmc.c
@@ -68,6 +68,9 @@
 #define        GPMC_ECC_BCH_RESULT_1   0x244   /* not available on OMAP2 */
 #define        GPMC_ECC_BCH_RESULT_2   0x248   /* not available on OMAP2 */
 #define        GPMC_ECC_BCH_RESULT_3   0x24c   /* not available on OMAP2 */
+#define        GPMC_ECC_BCH_RESULT_4   0x300   /* not available on OMAP2 */
+#define        GPMC_ECC_BCH_RESULT_5   0x304   /* not available on OMAP2 */
+#define        GPMC_ECC_BCH_RESULT_6   0x308   /* not available on OMAP2 */
 
 /* GPMC ECC control settings */
 #define GPMC_ECC_CTRL_ECCCLEAR         0x100
@@ -666,6 +669,12 @@ void gpmc_update_nand_reg(struct gpmc_nand_regs *reg, int cs)
                                           GPMC_BCH_SIZE * i;
                reg->gpmc_bch_result3[i] = gpmc_base + GPMC_ECC_BCH_RESULT_3 +
                                           GPMC_BCH_SIZE * i;
+               reg->gpmc_bch_result4[i] = gpmc_base + GPMC_ECC_BCH_RESULT_4 +
+                                          i * GPMC_BCH_SIZE;
+               reg->gpmc_bch_result5[i] = gpmc_base + GPMC_ECC_BCH_RESULT_5 +
+                                          i * GPMC_BCH_SIZE;
+               reg->gpmc_bch_result6[i] = gpmc_base + GPMC_ECC_BCH_RESULT_6 +
+                                          i * GPMC_BCH_SIZE;
        }
 }
 
@@ -1401,6 +1410,12 @@ static int gpmc_probe_nand_child(struct platform_device *pdev,
                else
                        gpmc_nand_data->ecc_opt =
                                OMAP_ECC_BCH8_CODE_HW_DETECTION_SW;
+       else if (!strcmp(s, "bch16"))
+               if (gpmc_nand_data->elm_of_node)
+                       gpmc_nand_data->ecc_opt =
+                               OMAP_ECC_BCH16_CODE_HW;
+               else
+                       pr_err("%s: BCH16 requires ELM support\n", __func__);
        else
                pr_err("%s: ti,nand-ecc-opt invalid value\n", __func__);
 

diff --git a/include/linux/platform_data/mtd-nand-omap2.h b/include/linux/platform_data/mtd-nand-omap2.h
index 3e9dd6676b9799aba4999d422a624f9a3a991b44..660c029d694fce72c7f3b8d53c7703d21c85f54a 100644 (file)
--- a/include/linux/platform_data/mtd-nand-omap2.h
+++ b/include/linux/platform_data/mtd-nand-omap2.h
@@ -31,6 +31,8 @@ enum omap_ecc {
        OMAP_ECC_BCH8_CODE_HW_DETECTION_SW,
        /* 8-bit  ECC calculation by GPMC, Error detection by ELM */
        OMAP_ECC_BCH8_CODE_HW,
+       /* 16-bit ECC calculation by GPMC, Error detection by ELM */
+       OMAP_ECC_BCH16_CODE_HW,
 };
 
 struct gpmc_nand_regs {
@@ -50,6 +52,9 @@ struct gpmc_nand_regs {
        void __iomem    *gpmc_bch_result1[GPMC_BCH_NUM_REMAINDER];
        void __iomem    *gpmc_bch_result2[GPMC_BCH_NUM_REMAINDER];
        void __iomem    *gpmc_bch_result3[GPMC_BCH_NUM_REMAINDER];
+       void __iomem    *gpmc_bch_result4[GPMC_BCH_NUM_REMAINDER];
+       void __iomem    *gpmc_bch_result5[GPMC_BCH_NUM_REMAINDER];
+       void __iomem    *gpmc_bch_result6[GPMC_BCH_NUM_REMAINDER];
 };
 
 struct omap_nand_platform_data {