154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Author: Mario Kicherer <dev@kicherer.org>
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*/
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/mtd/spinand.h>
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#define SPINAND_MFR_ALLIANCEMEMORY 0x52
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#define AM_STATUS_ECC_BITMASK (3 << 4)
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#define AM_STATUS_ECC_NONE_DETECTED (0 << 4)
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#define AM_STATUS_ECC_CORRECTED (1 << 4)
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#define AM_STATUS_ECC_ERRORED (2 << 4)
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#define AM_STATUS_ECC_MAX_CORRECTED (3 << 4)
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static SPINAND_OP_VARIANTS(read_cache_variants,
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SPINAND_PAGE_READ_FROM_CACHE_QUADIO_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_X4_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_DUALIO_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_X2_OP(0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_OP(true, 0, 1, NULL, 0),
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SPINAND_PAGE_READ_FROM_CACHE_OP(false, 0, 1, NULL, 0));
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static SPINAND_OP_VARIANTS(write_cache_variants,
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SPINAND_PROG_LOAD_X4(true, 0, NULL, 0),
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SPINAND_PROG_LOAD(true, 0, NULL, 0));
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static SPINAND_OP_VARIANTS(update_cache_variants,
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SPINAND_PROG_LOAD_X4(false, 0, NULL, 0),
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SPINAND_PROG_LOAD(false, 0, NULL, 0));
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static int am_get_eccsize(struct mtd_info *mtd)
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{
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if (mtd->oobsize == 64)
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return 0x20;
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else if (mtd->oobsize == 128)
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return 0x38;
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else if (mtd->oobsize == 256)
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return 0x70;
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else
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return -EINVAL;
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}
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static int am_ooblayout_ecc(struct mtd_info *mtd, int section,
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struct mtd_oob_region *region)
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{
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int ecc_bytes;
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ecc_bytes = am_get_eccsize(mtd);
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if (ecc_bytes < 0)
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return ecc_bytes;
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region->offset = mtd->oobsize - ecc_bytes;
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region->length = ecc_bytes;
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return 0;
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}
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static int am_ooblayout_free(struct mtd_info *mtd, int section,
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struct mtd_oob_region *region)
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{
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int ecc_bytes;
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if (section)
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return -ERANGE;
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ecc_bytes = am_get_eccsize(mtd);
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if (ecc_bytes < 0)
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return ecc_bytes;
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/*
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* It is unclear how many bytes are used for the bad block marker. We
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* reserve the common two bytes here.
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*
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* The free area in this kind of flash is divided into chunks where the
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* first 4 bytes of each chunk are unprotected. The number of chunks
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* depends on the specific model. The models with 4096+256 bytes pages
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* have 8 chunks, the others 4 chunks.
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*/
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region->offset = 2;
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region->length = mtd->oobsize - 2 - ecc_bytes;
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return 0;
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}
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static const struct mtd_ooblayout_ops am_ooblayout = {
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.ecc = am_ooblayout_ecc,
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.free = am_ooblayout_free,
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};
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static int am_ecc_get_status(struct spinand_device *spinand, u8 status)
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{
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switch (status & AM_STATUS_ECC_BITMASK) {
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case AM_STATUS_ECC_NONE_DETECTED:
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return 0;
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case AM_STATUS_ECC_CORRECTED:
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/*
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* use oobsize to determine the flash model and the maximum of
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* correctable errors and return maximum - 1 by convention
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*/
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if (spinand->base.mtd.oobsize == 64)
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return 3;
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else
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return 7;
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case AM_STATUS_ECC_ERRORED:
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return -EBADMSG;
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case AM_STATUS_ECC_MAX_CORRECTED:
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/*
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* use oobsize to determine the flash model and the maximum of
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* correctable errors
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*/
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if (spinand->base.mtd.oobsize == 64)
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return 4;
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else
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return 8;
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default:
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break;
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}
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return -EINVAL;
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}
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static const struct spinand_info alliancememory_spinand_table[] = {
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SPINAND_INFO("AS5F34G04SND",
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SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x2f),
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NAND_MEMORG(1, 2048, 128, 64, 4096, 80, 1, 1, 1),
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NAND_ECCREQ(4, 512),
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SPINAND_INFO_OP_VARIANTS(&read_cache_variants,
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&write_cache_variants,
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&update_cache_variants),
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SPINAND_HAS_QE_BIT,
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SPINAND_ECCINFO(&am_ooblayout,
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am_ecc_get_status)),
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};
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static const struct spinand_manufacturer_ops alliancememory_spinand_manuf_ops = {
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};
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const struct spinand_manufacturer alliancememory_spinand_manufacturer = {
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.id = SPINAND_MFR_ALLIANCEMEMORY,
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.name = "AllianceMemory",
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.chips = alliancememory_spinand_table,
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.nchips = ARRAY_SIZE(alliancememory_spinand_table),
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.ops = &alliancememory_spinand_manuf_ops,
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};
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