diff options
Diffstat (limited to 'drivers/mtd/nand/tegra_nand.c')
| -rw-r--r-- | drivers/mtd/nand/tegra_nand.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/mtd/nand/tegra_nand.c b/drivers/mtd/nand/tegra_nand.c index b02d27abc35..b51910bf4fc 100644 --- a/drivers/mtd/nand/tegra_nand.c +++ b/drivers/mtd/nand/tegra_nand.c @@ -87,6 +87,7 @@ struct fdt_nand { struct nand_drv { struct nand_ctlr *reg; struct fdt_nand config; + uint8_t *data_buf; /* cache alignment bounce buffer */ }; static struct nand_drv nand_ctrl; @@ -534,6 +535,7 @@ static int nand_rw_page(struct mtd_info *mtd, struct nand_chip *chip, char *tag_ptr; struct nand_drv *info; struct fdt_nand *config; + uint8_t *temp_buf = NULL; if ((uintptr_t)buf & 0x03) { printf("buf %p has to be 4-byte aligned\n", buf); @@ -545,6 +547,12 @@ static int nand_rw_page(struct mtd_info *mtd, struct nand_chip *chip, if (set_bus_width_page_size(config, ®_val)) return -EINVAL; + /* cache alignment */ + if ((!is_writing) && ((uintptr_t)buf & (ARCH_DMA_MINALIGN - 1))) { + temp_buf = buf; + buf = info->data_buf; + } + /* Need to be 4-byte aligned */ tag_ptr = (char *)tag_buf; @@ -633,6 +641,11 @@ static int nand_rw_page(struct mtd_info *mtd, struct nand_chip *chip, return -EIO; } + /* cache alignment */ + if (temp_buf) { + memcpy(temp_buf, buf, 1 << chip->page_shift); + } + if (with_ecc && !is_writing) { memcpy(chip->oob_poi, tag_ptr, SKIPPED_SPARE_BYTES); @@ -994,6 +1007,11 @@ int tegra_nand_init(struct nand_chip *nand, int devnum) nand->ecc.size = our_mtd->writesize; nand->ecc.bytes = our_mtd->oobsize; + /* cache alignment */ + info->data_buf = memalign(ARCH_DMA_MINALIGN, our_mtd->writesize); + if (!info->data_buf) + return -ENOMEM; + ret = nand_scan_tail(our_mtd); if (ret) return ret; |