diff options
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/spi/spi-nor-core.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c index ece4bc9..f2354fe 100644 --- a/drivers/mtd/spi/spi-nor-core.c +++ b/drivers/mtd/spi/spi-nor-core.c @@ -887,6 +887,67 @@ erase_err: return ret; } +#ifdef CONFIG_SPI_FLASH_S28HS512T +/** + * spansion_erase_non_uniform() - erase non-uniform sectors for Spansion/Cypress + * chips + * @nor: pointer to a 'struct spi_nor' + * @addr: address of the sector to erase + * @opcode_4k: opcode for 4K sector erase + * @ovlsz_top: size of overlaid portion at the top address + * @ovlsz_btm: size of overlaid portion at the bottom address + * + * Erase an address range on the nor chip that can contain 4KB sectors overlaid + * on top and/or bottom. The appropriate erase opcode and size are chosen by + * address to erase and size of overlaid portion. + * + * Return: number of bytes erased on success, -errno otherwise. + */ +static int spansion_erase_non_uniform(struct spi_nor *nor, u32 addr, + u8 opcode_4k, u32 ovlsz_top, + u32 ovlsz_btm) +{ + struct spi_mem_op op = + SPI_MEM_OP(SPI_MEM_OP_CMD(nor->erase_opcode, 0), + SPI_MEM_OP_ADDR(nor->addr_width, addr, 0), + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_NO_DATA); + struct mtd_info *mtd = &nor->mtd; + u32 erasesize; + int ret; + + /* 4KB sectors */ + if (op.addr.val < ovlsz_btm || + op.addr.val >= mtd->size - ovlsz_top) { + op.cmd.opcode = opcode_4k; + erasesize = SZ_4K; + + /* Non-overlaid portion in the normal sector at the bottom */ + } else if (op.addr.val == ovlsz_btm) { + op.cmd.opcode = nor->erase_opcode; + erasesize = mtd->erasesize - ovlsz_btm; + + /* Non-overlaid portion in the normal sector at the top */ + } else if (op.addr.val == mtd->size - mtd->erasesize) { + op.cmd.opcode = nor->erase_opcode; + erasesize = mtd->erasesize - ovlsz_top; + + /* Normal sectors */ + } else { + op.cmd.opcode = nor->erase_opcode; + erasesize = mtd->erasesize; + } + + spi_nor_setup_op(nor, &op, nor->write_proto); + + ret = spi_mem_exec_op(nor->spi, &op); + if (ret) + return ret; + + return erasesize; +} +#endif + #if defined(CONFIG_SPI_FLASH_STMICRO) || defined(CONFIG_SPI_FLASH_SST) /* Write status register and ensure bits in mask match written values */ static int write_sr_and_check(struct spi_nor *nor, u8 status_new, u8 mask) |