[RFC PATCH nand/next 2/4] include: mtd: Add CASN page definition and related structs.

[Sky Huang <SkyLake.Huang@mediatek.com>]

From: "Sky Huang" <skylake.huang@mediatek.com>

This patch adds CASN page definition. You can see corresponding
table in CASN page application note referred in cover letter.
(https://github.com/mtk-openwrt/doc/blob/
main/CASN%20Page%20Introduction.pdf)

Signed-off-by: Sky Huang <skylake.huang@mediatek.com>
---
 include/linux/mtd/casn.h | 191 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 191 insertions(+)
 create mode 100644 include/linux/mtd/casn.h

diff --git a/include/linux/mtd/casn.h b/include/linux/mtd/casn.h
new file mode 100644
index 000000000000..65ebd23c17c1
--- /dev/null
+++ b/include/linux/mtd/casn.h
@@ -0,0 +1,191 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 - Mediatek
+ *
+ * Author: Sky Huang <SkyLake.Huang@mediatek.com>
+ */
+
+#ifndef __LINUX_MTD_CASN_H
+#define __LINUX_MTD_CASN_H
+
+#define CASN_CRC_BASE	0x4341
+#define CASN_SIGNATURE	0x4341534EU
+#define SPINAND_CASN_V1_CRC_OFS (254)
+#define CASN_PAGE_V1_COPIES     (3)
+
+#define SDR_READ_1_1_1		BIT(0)
+#define SDR_READ_1_1_1_FAST	BIT(1)
+#define SDR_READ_1_1_2		BIT(2)
+#define SDR_READ_1_2_2		BIT(3)
+#define SDR_READ_1_1_4		BIT(4)
+#define SDR_READ_1_4_4		BIT(5)
+#define SDR_READ_1_1_8		BIT(6)
+#define SDR_READ_1_8_8		BIT(7)
+
+#define SDR_WRITE_1_1_1		BIT(0)
+#define SDR_WRITE_1_1_4		BIT(1)
+
+#define SDR_UPDATE_1_1_1	BIT(0)
+#define SDR_UPDATE_1_1_4	BIT(1)
+
+struct op_slice {
+	u8 cmd_opcode;
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	u8 dummy_nbytes : 4;
+	u8 addr_nbytes : 4;
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	u8 addr_nbytes : 4;
+	u8 dummy_nbytes : 4;
+#endif
+};
+
+struct SPINAND_FLAGS {
+#if defined(__LITTLE_ENDIAN_BITFIELD)
+	u8 has_qe_bit : 1;
+	u8 has_cr_feat_bit : 1;
+	u8 conti_read_cap : 1;
+	u8 on_die_ecc : 1;
+	u8 legacy_ecc_status : 1;
+	u8 adv_ecc_status : 1;
+	u8 ecc_parity_readable : 1;
+	u8 ecc_alg : 1; /* ECC algorithm */
+#elif defined(__BIG_ENDIAN_BITFIELD)
+	u8 ecc_alg : 1; /* ECC algorithm */
+	u8 ecc_parity_readable : 1;
+	u8 adv_ecc_status : 1;
+	u8 legacy_ecc_status : 1;
+	u8 on_die_ecc : 1;
+	u8 conti_read_cap : 1;
+	u8 has_cr_feat_bit : 1;
+	u8 has_qe_bit : 1;
+#endif
+};
+
+struct ADV_ECC_STATUS {
+	u8 cmd;
+	u8 addr;
+	u8 addr_nbytes;
+	u8 addr_buswidth;
+	u8 dummy_nbytes;
+	u8 dummy_buswidth;
+	u8 status_nbytes;
+	u16 status_mask;
+	u8 pre_op; /* pre-process operator */
+	u8 pre_mask; /* pre-process mask */
+} __packed;
+
+struct CASN_OOB {
+	u8 layout_type;
+
+	/* OOB free layout */
+	u8 free_start;
+	u8 free_length;
+	u8 bbm_length;
+
+	/* ECC parity layout */
+	u8 ecc_parity_start;
+	u8 ecc_parity_space;
+	u8 ecc_parity_real_length;
+};
+
+enum oob_overall {
+	OOB_DISCRETE = 0,
+	OOB_CONTINUOUS,
+};
+
+struct nand_casn {
+	/* CASN signature must be 4 chars: 'C','A','S','N'  */
+	union {
+		u8 sig[4];
+		u32 signature;
+	};
+
+	u8 version;
+	char manufacturer[13];
+	char model[16];
+
+	__be32 bits_per_cell;
+	__be32 bytes_per_page;
+	__be32 spare_bytes_per_page;
+	__be32 pages_per_block;
+	__be32 blocks_per_lun;
+	__be32 max_bb_per_lun;
+	__be32 planes_per_lun;
+	__be32 luns_per_target;
+	__be32 total_target;
+
+	__be32 ecc_strength;
+	__be32 ecc_step_size;
+
+	u8 flags;
+	u8 reserved1;
+
+	__be16 sdr_read_cap;
+	struct op_slice sdr_read_1_1_1;
+	struct op_slice sdr_read_1_1_1_fast;
+	struct op_slice sdr_read_1_1_2;
+	struct op_slice sdr_read_1_2_2;
+	struct op_slice sdr_read_1_1_4;
+	struct op_slice sdr_read_1_4_4;
+	struct op_slice sdr_read_1_1_8;
+	struct op_slice sdr_read_1_8_8;
+
+	struct op_slice sdr_cont_read_1_1_1;
+	struct op_slice sdr_cont_read_1_1_1_fast;
+	struct op_slice sdr_cont_read_1_1_2;
+	struct op_slice sdr_cont_read_1_2_2;
+	struct op_slice sdr_cont_read_1_1_4;
+	struct op_slice sdr_cont_read_1_4_4;
+	struct op_slice sdr_cont_read_1_1_8;
+	struct op_slice sdr_cont_read_1_8_8;
+
+	__be16 ddr_read_cap;
+	struct op_slice ddr_read_1_1_1;
+	struct op_slice ddr_read_1_1_1_fast;
+	struct op_slice ddr_read_1_1_2;
+	struct op_slice ddr_read_1_2_2;
+	struct op_slice ddr_read_1_1_4;
+	struct op_slice ddr_read_1_4_4;
+	struct op_slice ddr_read_1_1_8;
+	struct op_slice ddr_read_1_8_8;
+
+	struct op_slice ddr_cont_read_1_1_1;
+	struct op_slice ddr_cont_read_1_1_1_fast;
+	struct op_slice ddr_cont_read_1_1_2;
+	struct op_slice ddr_cont_read_1_2_2;
+	struct op_slice ddr_cont_read_1_1_4;
+	struct op_slice ddr_cont_read_1_4_4;
+	struct op_slice ddr_cont_read_1_1_8;
+	struct op_slice ddr_cont_read_1_8_8;
+
+	u8 sdr_write_cap;
+	struct op_slice sdr_write_1_1_1;
+	struct op_slice sdr_write_1_1_4;
+	struct op_slice reserved2[6];
+	u8 ddr_write_cap;
+	struct op_slice reserved3[8];
+
+	u8 sdr_update_cap;
+	struct op_slice sdr_update_1_1_1;
+	struct op_slice sdr_update_1_1_4;
+	struct op_slice reserved4[6];
+	u8 ddr_update_cap;
+	struct op_slice reserved5[8];
+
+	struct CASN_OOB casn_oob;
+
+	/* Advanced ECC status CMD0 (higher bits) */
+	struct ADV_ECC_STATUS ecc_status_high;
+	/* Advanced ECC status CMD1 (lower bits) */
+	struct ADV_ECC_STATUS ecc_status_low;
+
+	u8 advecc_noerr_status;
+	u8 advecc_uncor_status;
+	u8 advecc_post_op;
+	u8 advecc_post_mask;
+
+	u8 reserved6[5];
+	__be16 crc;
+} __packed;
+
+#endif /* __LINUX_MTD_CASN_H */
-- 
2.45.2