This patch adds NAND flash controller driver for MediaTek MT7621 SoC. The NAND flash controller of MT7621 supports only SLC NAND flashes. It supports 4~12 bits correction with maximum 4KB page size.
Signed-off-by: Weijie Gao weijie.gao@mediatek.com --- v3 changes: none v2 changes: none --- drivers/mtd/nand/raw/Kconfig | 11 + drivers/mtd/nand/raw/Makefile | 1 + drivers/mtd/nand/raw/mt7621_nand.c | 1189 ++++++++++++++++++++++++++++ 3 files changed, 1201 insertions(+) create mode 100644 drivers/mtd/nand/raw/mt7621_nand.c
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig index d75f371c95..763e16976d 100644 --- a/drivers/mtd/nand/raw/Kconfig +++ b/drivers/mtd/nand/raw/Kconfig @@ -521,6 +521,17 @@ config TEGRA_NAND help Enables support for NAND Flash chips on Tegra SoCs platforms.
+config NAND_MT7621 + bool "Support for MediaTek MT7621 NAND flash controller" + depends on SOC_MT7621 + select SYS_NAND_SELF_INIT + imply CMD_NAND + help + This enables NAND driver for the NAND flash controller on MediaTek + MT7621 platform. + The controller supports 4~12 bits correction per 512 bytes with a + maximum 4KB page size. + comment "Generic NAND options"
config SYS_NAND_BLOCK_SIZE diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile index 6ec3581d20..6d6721a3be 100644 --- a/drivers/mtd/nand/raw/Makefile +++ b/drivers/mtd/nand/raw/Makefile @@ -72,6 +72,7 @@ obj-$(CONFIG_NAND_ZYNQ) += zynq_nand.o obj-$(CONFIG_NAND_STM32_FMC2) += stm32_fmc2_nand.o obj-$(CONFIG_CORTINA_NAND) += cortina_nand.o obj-$(CONFIG_ROCKCHIP_NAND) += rockchip_nfc.o +obj-$(CONFIG_NAND_MT7621) += mt7621_nand.o
else # minimal SPL drivers
diff --git a/drivers/mtd/nand/raw/mt7621_nand.c b/drivers/mtd/nand/raw/mt7621_nand.c new file mode 100644 index 0000000000..e4fe5320f1 --- /dev/null +++ b/drivers/mtd/nand/raw/mt7621_nand.c @@ -0,0 +1,1189 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2021 MediaTek Incorporation. All Rights Reserved. + * + * Author: Weijie Gao weijie.gao@mediatek.com + */ + +#include <log.h> +#include <nand.h> +#include <malloc.h> +#include <asm/addrspace.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/sizes.h> +#include <linux/bitops.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/rawnand.h> + +/* NFI core registers */ +#define NFI_CNFG 0x000 +#define CNFG_OP_MODE_S 12 +#define CNFG_OP_MODE_M GENMASK(14, 12) +#define CNFG_OP_CUSTOM 6 +#define CNFG_AUTO_FMT_EN BIT(9) +#define CNFG_HW_ECC_EN BIT(8) +#define CNFG_BYTE_RW BIT(6) +#define CNFG_READ_MODE BIT(1) + +#define NFI_PAGEFMT 0x004 +#define PAGEFMT_FDM_ECC_S 12 +#define PAGEFMT_FDM_ECC_M GENMASK(15, 12) +#define PAGEFMT_FDM_S 8 +#define PAGEFMT_FDM_M GENMASK(11, 8) +#define PAGEFMT_SPARE_S 4 +#define PAGEFMT_SPARE_M GENMASK(5, 4) +#define PAGEFMT_PAGE_S 0 +#define PAGEFMT_PAGE_M GENMASK(1, 0) + +#define NFI_CON 0x008 +#define CON_NFI_SEC_S 12 +#define CON_NFI_SEC_M GENMASK(15, 12) +#define CON_NFI_BWR BIT(9) +#define CON_NFI_BRD BIT(8) +#define CON_NFI_RST BIT(1) +#define CON_FIFO_FLUSH BIT(0) + +#define NFI_ACCCON 0x00c +#define ACCCON_POECS_S 28 +#define ACCCON_POECS_MAX 0x0f +#define ACCCON_POECS_DEF 3 +#define ACCCON_PRECS_S 22 +#define ACCCON_PRECS_MAX 0x3f +#define ACCCON_PRECS_DEF 3 +#define ACCCON_C2R_S 16 +#define ACCCON_C2R_MAX 0x3f +#define ACCCON_C2R_DEF 7 +#define ACCCON_W2R_S 12 +#define ACCCON_W2R_MAX 0x0f +#define ACCCON_W2R_DEF 7 +#define ACCCON_WH_S 8 +#define ACCCON_WH_MAX 0x0f +#define ACCCON_WH_DEF 15 +#define ACCCON_WST_S 4 +#define ACCCON_WST_MAX 0x0f +#define ACCCON_WST_DEF 15 +#define ACCCON_WST_MIN 3 +#define ACCCON_RLT_S 0 +#define ACCCON_RLT_MAX 0x0f +#define ACCCON_RLT_DEF 15 +#define ACCCON_RLT_MIN 3 + +#define NFI_CMD 0x020 + +#define NFI_ADDRNOB 0x030 +#define ADDR_ROW_NOB_S 4 +#define ADDR_ROW_NOB_M GENMASK(6, 4) +#define ADDR_COL_NOB_S 0 +#define ADDR_COL_NOB_M GENMASK(2, 0) + +#define NFI_COLADDR 0x034 +#define NFI_ROWADDR 0x038 + +#define NFI_STRDATA 0x040 +#define STR_DATA BIT(0) + +#define NFI_CNRNB 0x044 +#define CB2R_TIME_S 4 +#define CB2R_TIME_M GENMASK(7, 4) +#define STR_CNRNB BIT(0) + +#define NFI_DATAW 0x050 +#define NFI_DATAR 0x054 + +#define NFI_PIO_DIRDY 0x058 +#define PIO_DIRDY BIT(0) + +#define NFI_STA 0x060 +#define STA_NFI_FSM_S 16 +#define STA_NFI_FSM_M GENMASK(19, 16) +#define STA_FSM_CUSTOM_DATA 14 +#define STA_BUSY BIT(8) +#define STA_ADDR BIT(1) +#define STA_CMD BIT(0) + +#define NFI_ADDRCNTR 0x070 +#define SEC_CNTR_S 12 +#define SEC_CNTR_M GENMASK(15, 12) +#define SEC_ADDR_S 0 +#define SEC_ADDR_M GENMASK(9, 0) + +#define NFI_CSEL 0x090 +#define CSEL_S 0 +#define CSEL_M GENMASK(1, 0) + +#define NFI_FDM0L 0x0a0 +#define NFI_FDML(n) (0x0a0 + ((n) << 3)) + +#define NFI_FDM0M 0x0a4 +#define NFI_FDMM(n) (0x0a4 + ((n) << 3)) + +#define NFI_MASTER_STA 0x210 +#define MAS_ADDR GENMASK(11, 9) +#define MAS_RD GENMASK(8, 6) +#define MAS_WR GENMASK(5, 3) +#define MAS_RDDLY GENMASK(2, 0) + +/* ECC engine registers */ +#define ECC_ENCCON 0x000 +#define ENC_EN BIT(0) + +#define ECC_ENCCNFG 0x004 +#define ENC_CNFG_MSG_S 16 +#define ENC_CNFG_MSG_M GENMASK(28, 16) +#define ENC_MODE_S 4 +#define ENC_MODE_M GENMASK(5, 4) +#define ENC_MODE_NFI 1 +#define ENC_TNUM_S 0 +#define ENC_TNUM_M GENMASK(2, 0) + +#define ECC_ENCIDLE 0x00c +#define ENC_IDLE BIT(0) + +#define ECC_DECCON 0x100 +#define DEC_EN BIT(0) + +#define ECC_DECCNFG 0x104 +#define DEC_EMPTY_EN BIT(31) +#define DEC_CS_S 16 +#define DEC_CS_M GENMASK(28, 16) +#define DEC_CON_S 12 +#define DEC_CON_M GENMASK(13, 12) +#define DEC_CON_EL 2 +#define DEC_MODE_S 4 +#define DEC_MODE_M GENMASK(5, 4) +#define DEC_MODE_NFI 1 +#define DEC_TNUM_S 0 +#define DEC_TNUM_M GENMASK(2, 0) + +#define ECC_DECIDLE 0x10c +#define DEC_IDLE BIT(1) + +#define ECC_DECENUM 0x114 +#define ERRNUM_S 2 +#define ERRNUM_M GENMASK(3, 0) + +#define ECC_DECDONE 0x118 +#define DEC_DONE7 BIT(7) +#define DEC_DONE6 BIT(6) +#define DEC_DONE5 BIT(5) +#define DEC_DONE4 BIT(4) +#define DEC_DONE3 BIT(3) +#define DEC_DONE2 BIT(2) +#define DEC_DONE1 BIT(1) +#define DEC_DONE0 BIT(0) + +#define ECC_DECEL(n) (0x11c + (n) * 4) +#define DEC_EL_ODD_S 16 +#define DEC_EL_EVEN_S 0 +#define DEC_EL_M 0x1fff +#define DEC_EL_BYTE_POS_S 3 +#define DEC_EL_BIT_POS_M GENMASK(3, 0) + +#define ECC_FDMADDR 0x13c + +/* ENCIDLE and DECIDLE */ +#define ECC_IDLE BIT(0) + +#define ACCTIMING(tpoecs, tprecs, tc2r, tw2r, twh, twst, trlt) \ + ((tpoecs) << ACCCON_POECS_S | (tprecs) << ACCCON_PRECS_S | \ + (tc2r) << ACCCON_C2R_S | (tw2r) << ACCCON_W2R_S | \ + (twh) << ACCCON_WH_S | (twst) << ACCCON_WST_S | (trlt)) + +#define MASTER_STA_MASK (MAS_ADDR | MAS_RD | MAS_WR | \ + MAS_RDDLY) +#define NFI_RESET_TIMEOUT 1000000 +#define NFI_CORE_TIMEOUT 500000 +#define ECC_ENGINE_TIMEOUT 500000 + +#define ECC_SECTOR_SIZE 512 +#define ECC_PARITY_BITS 13 + +#define NFI_FDM_SIZE 8 + +/* Register base */ +#define NFI_BASE 0x1e003000 +#define NFI_ECC_BASE 0x1e003800 + +struct mt7621_nfc { + struct nand_chip nand; + + void __iomem *nfi_regs; + void __iomem *ecc_regs; + + u32 spare_per_sector; +}; + +static struct mt7621_nfc nfc_dev; + +static const u16 mt7621_nfi_page_size[] = { SZ_512, SZ_2K, SZ_4K }; +static const u8 mt7621_nfi_spare_size[] = { 16, 26, 27, 28 }; +static const u8 mt7621_ecc_strength[] = { 4, 6, 8, 10, 12 }; + +static inline u32 nfi_read32(struct mt7621_nfc *nfc, u32 reg) +{ + return readl(nfc->nfi_regs + reg); +} + +static inline void nfi_write32(struct mt7621_nfc *nfc, u32 reg, u32 val) +{ + writel(val, nfc->nfi_regs + reg); +} + +static inline u16 nfi_read16(struct mt7621_nfc *nfc, u32 reg) +{ + return readw(nfc->nfi_regs + reg); +} + +static inline void nfi_write16(struct mt7621_nfc *nfc, u32 reg, u16 val) +{ + writew(val, nfc->nfi_regs + reg); +} + +static inline void ecc_write16(struct mt7621_nfc *nfc, u32 reg, u16 val) +{ + writew(val, nfc->ecc_regs + reg); +} + +static inline u32 ecc_read32(struct mt7621_nfc *nfc, u32 reg) +{ + return readl(nfc->ecc_regs + reg); +} + +static inline void ecc_write32(struct mt7621_nfc *nfc, u32 reg, u32 val) +{ + return writel(val, nfc->ecc_regs + reg); +} + +static inline u8 *oob_fdm_ptr(struct nand_chip *nand, int sect) +{ + return nand->oob_poi + sect * NFI_FDM_SIZE; +} + +static inline u8 *oob_ecc_ptr(struct mt7621_nfc *nfc, int sect) +{ + struct nand_chip *nand = &nfc->nand; + + return nand->oob_poi + nand->ecc.steps * NFI_FDM_SIZE + + sect * (nfc->spare_per_sector - NFI_FDM_SIZE); +} + +static inline u8 *page_data_ptr(struct nand_chip *nand, const u8 *buf, + int sect) +{ + return (u8 *)buf + sect * nand->ecc.size; +} + +static int mt7621_ecc_wait_idle(struct mt7621_nfc *nfc, u32 reg) +{ + u32 val; + int ret; + + ret = readw_poll_timeout(nfc->ecc_regs + reg, val, val & ECC_IDLE, + ECC_ENGINE_TIMEOUT); + if (ret) { + pr_warn("ECC engine timed out entering idle mode\n"); + return -EIO; + } + + return 0; +} + +static int mt7621_ecc_decoder_wait_done(struct mt7621_nfc *nfc, u32 sect) +{ + u32 val; + int ret; + + ret = readw_poll_timeout(nfc->ecc_regs + ECC_DECDONE, val, + val & (1 << sect), ECC_ENGINE_TIMEOUT); + if (ret) { + pr_warn("ECC decoder for sector %d timed out\n", sect); + return -ETIMEDOUT; + } + + return 0; +} + +static void mt7621_ecc_encoder_op(struct mt7621_nfc *nfc, bool enable) +{ + mt7621_ecc_wait_idle(nfc, ECC_ENCIDLE); + ecc_write16(nfc, ECC_ENCCON, enable ? ENC_EN : 0); +} + +static void mt7621_ecc_decoder_op(struct mt7621_nfc *nfc, bool enable) +{ + mt7621_ecc_wait_idle(nfc, ECC_DECIDLE); + ecc_write16(nfc, ECC_DECCON, enable ? DEC_EN : 0); +} + +static int mt7621_ecc_correct_check(struct mt7621_nfc *nfc, u8 *sector_buf, + u8 *fdm_buf, u32 sect) +{ + struct nand_chip *nand = &nfc->nand; + u32 decnum, num_error_bits, fdm_end_bits; + u32 error_locations, error_bit_loc; + u32 error_byte_pos, error_bit_pos; + int bitflips = 0; + u32 i; + + decnum = ecc_read32(nfc, ECC_DECENUM); + num_error_bits = (decnum >> (sect << ERRNUM_S)) & ERRNUM_M; + fdm_end_bits = (nand->ecc.size + NFI_FDM_SIZE) << 3; + + if (!num_error_bits) + return 0; + + if (num_error_bits == ERRNUM_M) + return -1; + + for (i = 0; i < num_error_bits; i++) { + error_locations = ecc_read32(nfc, ECC_DECEL(i / 2)); + error_bit_loc = (error_locations >> ((i % 2) * DEC_EL_ODD_S)) & + DEC_EL_M; + error_byte_pos = error_bit_loc >> DEC_EL_BYTE_POS_S; + error_bit_pos = error_bit_loc & DEC_EL_BIT_POS_M; + + if (error_bit_loc < (nand->ecc.size << 3)) { + if (sector_buf) { + sector_buf[error_byte_pos] ^= + (1 << error_bit_pos); + } + } else if (error_bit_loc < fdm_end_bits) { + if (fdm_buf) { + fdm_buf[error_byte_pos - nand->ecc.size] ^= + (1 << error_bit_pos); + } + } + + bitflips++; + } + + return bitflips; +} + +static int mt7621_nfc_wait_write_completion(struct mt7621_nfc *nfc, + struct nand_chip *nand) +{ + u16 val; + int ret; + + ret = readw_poll_timeout(nfc->nfi_regs + NFI_ADDRCNTR, val, + ((val & SEC_CNTR_M) >> SEC_CNTR_S) >= nand->ecc.steps, + NFI_CORE_TIMEOUT); + + if (ret) { + pr_warn("NFI core write operation timed out\n"); + return -ETIMEDOUT; + } + + return ret; +} + +static void mt7621_nfc_hw_reset(struct mt7621_nfc *nfc) +{ + u32 val; + int ret; + + /* reset all registers and force the NFI master to terminate */ + nfi_write16(nfc, NFI_CON, CON_FIFO_FLUSH | CON_NFI_RST); + + /* wait for the master to finish the last transaction */ + ret = readw_poll_timeout(nfc->nfi_regs + NFI_MASTER_STA, val, + !(val & MASTER_STA_MASK), NFI_RESET_TIMEOUT); + if (ret) { + pr_warn("Failed to reset NFI master in %dms\n", + NFI_RESET_TIMEOUT); + } + + /* ensure any status register affected by the NFI master is reset */ + nfi_write16(nfc, NFI_CON, CON_FIFO_FLUSH | CON_NFI_RST); + nfi_write16(nfc, NFI_STRDATA, 0); +} + +static inline void mt7621_nfc_hw_init(struct mt7621_nfc *nfc) +{ + u32 acccon; + + /* + * CNRNB: nand ready/busy register + * ------------------------------- + * 7:4: timeout register for polling the NAND busy/ready signal + * 0 : poll the status of the busy/ready signal after [7:4]*16 cycles. + */ + nfi_write16(nfc, NFI_CNRNB, CB2R_TIME_M | STR_CNRNB); + + mt7621_nfc_hw_reset(nfc); + + /* Apply default access timing */ + acccon = ACCTIMING(ACCCON_POECS_DEF, ACCCON_PRECS_DEF, ACCCON_C2R_DEF, + ACCCON_W2R_DEF, ACCCON_WH_DEF, ACCCON_WST_DEF, + ACCCON_RLT_DEF); + + nfi_write32(nfc, NFI_ACCCON, acccon); +} + +static int mt7621_nfc_send_command(struct mt7621_nfc *nfc, u8 command) +{ + u32 val; + int ret; + + nfi_write32(nfc, NFI_CMD, command); + + ret = readl_poll_timeout(nfc->nfi_regs + NFI_STA, val, !(val & STA_CMD), + NFI_CORE_TIMEOUT); + if (ret) { + pr_warn("NFI core timed out entering command mode\n"); + return -EIO; + } + + return 0; +} + +static int mt7621_nfc_send_address_byte(struct mt7621_nfc *nfc, int addr) +{ + u32 val; + int ret; + + nfi_write32(nfc, NFI_COLADDR, addr); + nfi_write32(nfc, NFI_ROWADDR, 0); + nfi_write16(nfc, NFI_ADDRNOB, 1); + + ret = readl_poll_timeout(nfc->nfi_regs + NFI_STA, val, + !(val & STA_ADDR), NFI_CORE_TIMEOUT); + if (ret) { + pr_warn("NFI core timed out entering address mode\n"); + return -EIO; + } + + return 0; +} + +static void mt7621_nfc_cmd_ctrl(struct mtd_info *mtd, int dat, + unsigned int ctrl) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + if (ctrl & NAND_ALE) { + mt7621_nfc_send_address_byte(nfc, dat & 0xff); + } else if (ctrl & NAND_CLE) { + mt7621_nfc_hw_reset(nfc); + nfi_write16(nfc, NFI_CNFG, CNFG_OP_CUSTOM << CNFG_OP_MODE_S); + mt7621_nfc_send_command(nfc, dat); + } +} + +static int mt7621_nfc_dev_ready(struct mtd_info *mtd) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + if (nfi_read32(nfc, NFI_STA) & STA_BUSY) + return 0; + + return 1; +} + +static void mt7621_nfc_select_chip(struct mtd_info *mtd, int chipnr) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + nfi_write16(nfc, NFI_CSEL, 0); +} + +static void mt7621_nfc_wait_pio_ready(struct mt7621_nfc *nfc) +{ + int ret; + u16 val; + + ret = readw_poll_timeout(nfc->nfi_regs + NFI_PIO_DIRDY, val, + val & PIO_DIRDY, NFI_CORE_TIMEOUT); + if (ret < 0) + pr_err("NFI core PIO mode not ready\n"); +} + +static u32 mt7621_nfc_pio_read(struct mt7621_nfc *nfc, bool br) +{ + u32 reg; + + /* after each byte read, the NFI_STA reg is reset by the hardware */ + reg = (nfi_read32(nfc, NFI_STA) & STA_NFI_FSM_M) >> STA_NFI_FSM_S; + if (reg != STA_FSM_CUSTOM_DATA) { + reg = nfi_read16(nfc, NFI_CNFG); + reg |= CNFG_READ_MODE | CNFG_BYTE_RW; + if (!br) + reg &= ~CNFG_BYTE_RW; + nfi_write16(nfc, NFI_CNFG, reg); + + /* + * set to max sector to allow the HW to continue reading over + * unaligned accesses + */ + nfi_write16(nfc, NFI_CON, CON_NFI_SEC_M | CON_NFI_BRD); + + /* trigger to fetch data */ + nfi_write16(nfc, NFI_STRDATA, STR_DATA); + } + + mt7621_nfc_wait_pio_ready(nfc); + + return nfi_read32(nfc, NFI_DATAR); +} + +static void mt7621_nfc_read_data(struct mt7621_nfc *nfc, u8 *buf, u32 len) +{ + while (((uintptr_t)buf & 3) && len) { + *buf = mt7621_nfc_pio_read(nfc, true); + buf++; + len--; + } + + while (len >= 4) { + *(u32 *)buf = mt7621_nfc_pio_read(nfc, false); + buf += 4; + len -= 4; + } + + while (len) { + *buf = mt7621_nfc_pio_read(nfc, true); + buf++; + len--; + } +} + +static void mt7621_nfc_read_data_discard(struct mt7621_nfc *nfc, u32 len) +{ + while (len >= 4) { + mt7621_nfc_pio_read(nfc, false); + len -= 4; + } + + while (len) { + mt7621_nfc_pio_read(nfc, true); + len--; + } +} + +static void mt7621_nfc_pio_write(struct mt7621_nfc *nfc, u32 val, bool bw) +{ + u32 reg; + + reg = (nfi_read32(nfc, NFI_STA) & STA_NFI_FSM_M) >> STA_NFI_FSM_S; + if (reg != STA_FSM_CUSTOM_DATA) { + reg = nfi_read16(nfc, NFI_CNFG); + reg &= ~(CNFG_READ_MODE | CNFG_BYTE_RW); + if (bw) + reg |= CNFG_BYTE_RW; + nfi_write16(nfc, NFI_CNFG, reg); + + nfi_write16(nfc, NFI_CON, CON_NFI_SEC_M | CON_NFI_BWR); + nfi_write16(nfc, NFI_STRDATA, STR_DATA); + } + + mt7621_nfc_wait_pio_ready(nfc); + nfi_write32(nfc, NFI_DATAW, val); +} + +static void mt7621_nfc_write_data(struct mt7621_nfc *nfc, const u8 *buf, + u32 len) +{ + while (((uintptr_t)buf & 3) && len) { + mt7621_nfc_pio_write(nfc, *buf, true); + buf++; + len--; + } + + while (len >= 4) { + mt7621_nfc_pio_write(nfc, *(const u32 *)buf, false); + buf += 4; + len -= 4; + } + + while (len) { + mt7621_nfc_pio_write(nfc, *buf, true); + buf++; + len--; + } +} + +static void mt7621_nfc_write_data_empty(struct mt7621_nfc *nfc, u32 len) +{ + while (len >= 4) { + mt7621_nfc_pio_write(nfc, 0xffffffff, false); + len -= 4; + } + + while (len) { + mt7621_nfc_pio_write(nfc, 0xff, true); + len--; + } +} + +static void mt7621_nfc_write_byte(struct mtd_info *mtd, u8 byte) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + mt7621_nfc_pio_write(nfc, byte, true); +} + +static void mt7621_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int len) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + return mt7621_nfc_write_data(nfc, buf, len); +} + +static u8 mt7621_nfc_read_byte(struct mtd_info *mtd) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + return mt7621_nfc_pio_read(nfc, true); +} + +static void mt7621_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int len) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(mtd_to_nand(mtd)); + + mt7621_nfc_read_data(nfc, buf, len); +} + +static int mt7621_nfc_calc_ecc_strength(struct mt7621_nfc *nfc, + u32 avail_ecc_bytes) +{ + struct nand_chip *nand = &nfc->nand; + struct mtd_info *mtd = nand_to_mtd(nand); + u32 strength; + int i; + + strength = avail_ecc_bytes * 8 / ECC_PARITY_BITS; + + /* Find the closest supported ecc strength */ + for (i = ARRAY_SIZE(mt7621_ecc_strength) - 1; i >= 0; i--) { + if (mt7621_ecc_strength[i] <= strength) + break; + } + + if (unlikely(i < 0)) { + pr_err("OOB size (%u) is not supported\n", mtd->oobsize); + return -EINVAL; + } + + nand->ecc.strength = mt7621_ecc_strength[i]; + nand->ecc.bytes = + DIV_ROUND_UP(nand->ecc.strength * ECC_PARITY_BITS, 8); + + pr_debug("ECC strength adjusted to %u bits\n", nand->ecc.strength); + + return i; +} + +static int mt7621_nfc_set_spare_per_sector(struct mt7621_nfc *nfc) +{ + struct nand_chip *nand = &nfc->nand; + struct mtd_info *mtd = nand_to_mtd(nand); + u32 size; + int i; + + size = nand->ecc.bytes + NFI_FDM_SIZE; + + /* Find the closest supported spare size */ + for (i = 0; i < ARRAY_SIZE(mt7621_nfi_spare_size); i++) { + if (mt7621_nfi_spare_size[i] >= size) + break; + } + + if (unlikely(i >= ARRAY_SIZE(mt7621_nfi_spare_size))) { + pr_err("OOB size (%u) is not supported\n", mtd->oobsize); + return -EINVAL; + } + + nfc->spare_per_sector = mt7621_nfi_spare_size[i]; + + return i; +} + +static int mt7621_nfc_ecc_init(struct mt7621_nfc *nfc) +{ + struct nand_chip *nand = &nfc->nand; + struct mtd_info *mtd = nand_to_mtd(nand); + u32 spare_per_sector, encode_block_size, decode_block_size; + u32 ecc_enccfg, ecc_deccfg; + int ecc_cap; + + nand->ecc.options |= NAND_ECC_CUSTOM_PAGE_ACCESS; + + nand->ecc.size = ECC_SECTOR_SIZE; + nand->ecc.steps = mtd->writesize / nand->ecc.size; + + spare_per_sector = mtd->oobsize / nand->ecc.steps; + + ecc_cap = mt7621_nfc_calc_ecc_strength(nfc, + spare_per_sector - NFI_FDM_SIZE); + if (ecc_cap < 0) + return ecc_cap; + + /* Sector + FDM */ + encode_block_size = (nand->ecc.size + NFI_FDM_SIZE) * 8; + ecc_enccfg = ecc_cap | (ENC_MODE_NFI << ENC_MODE_S) | + (encode_block_size << ENC_CNFG_MSG_S); + + /* Sector + FDM + ECC parity bits */ + decode_block_size = ((nand->ecc.size + NFI_FDM_SIZE) * 8) + + nand->ecc.strength * ECC_PARITY_BITS; + ecc_deccfg = ecc_cap | (DEC_MODE_NFI << DEC_MODE_S) | + (decode_block_size << DEC_CS_S) | + (DEC_CON_EL << DEC_CON_S) | DEC_EMPTY_EN; + + mt7621_ecc_encoder_op(nfc, false); + ecc_write32(nfc, ECC_ENCCNFG, ecc_enccfg); + + mt7621_ecc_decoder_op(nfc, false); + ecc_write32(nfc, ECC_DECCNFG, ecc_deccfg); + + return 0; +} + +static int mt7621_nfc_set_page_format(struct mt7621_nfc *nfc) +{ + struct nand_chip *nand = &nfc->nand; + struct mtd_info *mtd = nand_to_mtd(nand); + int i, spare_size; + u32 pagefmt; + + spare_size = mt7621_nfc_set_spare_per_sector(nfc); + if (spare_size < 0) + return spare_size; + + for (i = 0; i < ARRAY_SIZE(mt7621_nfi_page_size); i++) { + if (mt7621_nfi_page_size[i] == mtd->writesize) + break; + } + + if (unlikely(i >= ARRAY_SIZE(mt7621_nfi_page_size))) { + pr_err("Page size (%u) is not supported\n", mtd->writesize); + return -EINVAL; + } + + pagefmt = i | (spare_size << PAGEFMT_SPARE_S) | + (NFI_FDM_SIZE << PAGEFMT_FDM_S) | + (NFI_FDM_SIZE << PAGEFMT_FDM_ECC_S); + + nfi_write16(nfc, NFI_PAGEFMT, pagefmt); + + return 0; +} + +static int mt7621_nfc_attach_chip(struct nand_chip *nand) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(nand); + int ret; + + if (nand->options & NAND_BUSWIDTH_16) { + pr_err("16-bit buswidth is not supported"); + return -EINVAL; + } + + ret = mt7621_nfc_ecc_init(nfc); + if (ret) + return ret; + + return mt7621_nfc_set_page_format(nfc); +} + +static void mt7621_nfc_write_fdm(struct mt7621_nfc *nfc) +{ + struct nand_chip *nand = &nfc->nand; + u32 vall, valm; + u8 *oobptr; + int i, j; + + for (i = 0; i < nand->ecc.steps; i++) { + vall = 0; + valm = 0; + oobptr = oob_fdm_ptr(nand, i); + + for (j = 0; j < 4; j++) + vall |= (u32)oobptr[j] << (j * 8); + + for (j = 0; j < 4; j++) + valm |= (u32)oobptr[j + 4] << ((j - 4) * 8); + + nfi_write32(nfc, NFI_FDML(i), vall); + nfi_write32(nfc, NFI_FDMM(i), valm); + } +} + +static void mt7621_nfc_read_sector_fdm(struct mt7621_nfc *nfc, u32 sect) +{ + struct nand_chip *nand = &nfc->nand; + u32 vall, valm; + u8 *oobptr; + int i; + + vall = nfi_read32(nfc, NFI_FDML(sect)); + valm = nfi_read32(nfc, NFI_FDMM(sect)); + oobptr = oob_fdm_ptr(nand, sect); + + for (i = 0; i < 4; i++) + oobptr[i] = (vall >> (i * 8)) & 0xff; + + for (i = 0; i < 4; i++) + oobptr[i + 4] = (valm >> (i * 8)) & 0xff; +} + +static int mt7621_nfc_read_page_hwecc(struct mtd_info *mtd, + struct nand_chip *nand, uint8_t *buf, + int oob_required, int page) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(nand); + int bitflips = 0, ret = 0; + int rc, i; + + nand_read_page_op(nand, page, 0, NULL, 0); + + nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) | + CNFG_READ_MODE | CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN); + + mt7621_ecc_decoder_op(nfc, true); + + nfi_write16(nfc, NFI_CON, + CON_NFI_BRD | (nand->ecc.steps << CON_NFI_SEC_S)); + + for (i = 0; i < nand->ecc.steps; i++) { + if (buf) + mt7621_nfc_read_data(nfc, page_data_ptr(nand, buf, i), + nand->ecc.size); + else + mt7621_nfc_read_data_discard(nfc, nand->ecc.size); + + rc = mt7621_ecc_decoder_wait_done(nfc, i); + + mt7621_nfc_read_sector_fdm(nfc, i); + + if (rc < 0) { + ret = -EIO; + continue; + } + + rc = mt7621_ecc_correct_check(nfc, + buf ? page_data_ptr(nand, buf, i) : NULL, + oob_fdm_ptr(nand, i), i); + + if (rc < 0) { + pr_warn("Uncorrectable ECC error at page %d step %d\n", + page, i); + bitflips = nand->ecc.strength + 1; + mtd->ecc_stats.failed++; + } else { + if (rc > bitflips) + bitflips = rc; + mtd->ecc_stats.corrected += rc; + } + } + + mt7621_ecc_decoder_op(nfc, false); + + nfi_write16(nfc, NFI_CON, 0); + + if (ret < 0) + return ret; + + return bitflips; +} + +static int mt7621_nfc_read_page_raw(struct mtd_info *mtd, + struct nand_chip *nand, uint8_t *buf, + int oob_required, int page) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(nand); + int i; + + nand_read_page_op(nand, page, 0, NULL, 0); + + nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) | + CNFG_READ_MODE); + + nfi_write16(nfc, NFI_CON, + CON_NFI_BRD | (nand->ecc.steps << CON_NFI_SEC_S)); + + for (i = 0; i < nand->ecc.steps; i++) { + /* Read data */ + if (buf) + mt7621_nfc_read_data(nfc, page_data_ptr(nand, buf, i), + nand->ecc.size); + else + mt7621_nfc_read_data_discard(nfc, nand->ecc.size); + + /* Read FDM */ + mt7621_nfc_read_data(nfc, oob_fdm_ptr(nand, i), NFI_FDM_SIZE); + + /* Read ECC parity data */ + mt7621_nfc_read_data(nfc, oob_ecc_ptr(nfc, i), + nfc->spare_per_sector - NFI_FDM_SIZE); + } + + nfi_write16(nfc, NFI_CON, 0); + + return 0; +} + +static int mt7621_nfc_read_oob_hwecc(struct mtd_info *mtd, + struct nand_chip *nand, int page) +{ + return mt7621_nfc_read_page_hwecc(mtd, nand, NULL, 1, page); +} + +static int mt7621_nfc_read_oob_raw(struct mtd_info *mtd, + struct nand_chip *nand, int page) +{ + return mt7621_nfc_read_page_raw(mtd, nand, NULL, 1, page); +} + +static int mt7621_nfc_check_empty_page(struct nand_chip *nand, const u8 *buf) +{ + struct mtd_info *mtd = nand_to_mtd(nand); + u8 *oobptr; + u32 i, j; + + if (buf) { + for (i = 0; i < mtd->writesize; i++) + if (buf[i] != 0xff) + return 0; + } + + for (i = 0; i < nand->ecc.steps; i++) { + oobptr = oob_fdm_ptr(nand, i); + for (j = 0; j < NFI_FDM_SIZE; j++) + if (oobptr[j] != 0xff) + return 0; + } + + return 1; +} + +static int mt7621_nfc_write_page_hwecc(struct mtd_info *mtd, + struct nand_chip *nand, + const u8 *buf, int oob_required, + int page) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(nand); + + if (mt7621_nfc_check_empty_page(nand, buf)) { + /* + * MT7621 ECC engine always generates parity code for input + * pages, even for empty pages. Doing so will write back ECC + * parity code to the oob region, which means such pages will + * no longer be empty pages. + * + * To avoid this, stop write operation if current page is an + * empty page. + */ + return 0; + } + + nand_prog_page_begin_op(nand, page, 0, NULL, 0); + + nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S) | + CNFG_AUTO_FMT_EN | CNFG_HW_ECC_EN); + + mt7621_ecc_encoder_op(nfc, true); + + mt7621_nfc_write_fdm(nfc); + + nfi_write16(nfc, NFI_CON, + CON_NFI_BWR | (nand->ecc.steps << CON_NFI_SEC_S)); + + if (buf) + mt7621_nfc_write_data(nfc, buf, mtd->writesize); + else + mt7621_nfc_write_data_empty(nfc, mtd->writesize); + + mt7621_nfc_wait_write_completion(nfc, nand); + + mt7621_ecc_encoder_op(nfc, false); + + nfi_write16(nfc, NFI_CON, 0); + + return nand_prog_page_end_op(nand); +} + +static int mt7621_nfc_write_page_raw(struct mtd_info *mtd, + struct nand_chip *nand, + const u8 *buf, int oob_required, + int page) +{ + struct mt7621_nfc *nfc = nand_get_controller_data(nand); + int i; + + nand_prog_page_begin_op(nand, page, 0, NULL, 0); + + nfi_write16(nfc, NFI_CNFG, (CNFG_OP_CUSTOM << CNFG_OP_MODE_S)); + + nfi_write16(nfc, NFI_CON, + CON_NFI_BWR | (nand->ecc.steps << CON_NFI_SEC_S)); + + for (i = 0; i < nand->ecc.steps; i++) { + /* Write data */ + if (buf) + mt7621_nfc_write_data(nfc, page_data_ptr(nand, buf, i), + nand->ecc.size); + else + mt7621_nfc_write_data_empty(nfc, nand->ecc.size); + + /* Write FDM */ + mt7621_nfc_write_data(nfc, oob_fdm_ptr(nand, i), + NFI_FDM_SIZE); + + /* Write dummy ECC parity data */ + mt7621_nfc_write_data_empty(nfc, nfc->spare_per_sector - + NFI_FDM_SIZE); + } + + mt7621_nfc_wait_write_completion(nfc, nand); + + nfi_write16(nfc, NFI_CON, 0); + + return nand_prog_page_end_op(nand); +} + +static int mt7621_nfc_write_oob_hwecc(struct mtd_info *mtd, + struct nand_chip *nand, int page) +{ + return mt7621_nfc_write_page_hwecc(mtd, nand, NULL, 1, page); +} + +static int mt7621_nfc_write_oob_raw(struct mtd_info *mtd, + struct nand_chip *nand, int page) +{ + return mt7621_nfc_write_page_raw(mtd, nand, NULL, 1, page); +} + +static int mt7621_nfc_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *oob_region) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + + if (section >= nand->ecc.steps) + return -ERANGE; + + oob_region->length = NFI_FDM_SIZE - 1; + oob_region->offset = section * NFI_FDM_SIZE + 1; + + return 0; +} + +static int mt7621_nfc_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *oob_region) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + + if (section) + return -ERANGE; + + oob_region->offset = NFI_FDM_SIZE * nand->ecc.steps; + oob_region->length = mtd->oobsize - oob_region->offset; + + return 0; +} + +static const struct mtd_ooblayout_ops mt7621_nfc_ooblayout_ops = { + .rfree = mt7621_nfc_ooblayout_free, + .ecc = mt7621_nfc_ooblayout_ecc, +}; + +/* + * This function will override the default one which is not supposed to be + * used for ECC syndrome based pages. + */ +static int mt7621_nfc_block_bad(struct mtd_info *mtd, loff_t ofs) +{ + struct nand_chip *nand = mtd_to_nand(mtd); + struct mtd_oob_ops ops; + int ret, i = 0; + u16 bad; + + memset(&ops, 0, sizeof(ops)); + ops.oobbuf = (uint8_t *)&bad; + ops.ooboffs = nand->badblockpos; + if (nand->options & NAND_BUSWIDTH_16) { + ops.ooboffs &= ~0x01; + ops.ooblen = 2; + } else { + ops.ooblen = 1; + } + ops.mode = MTD_OPS_RAW; + + /* Read from first/last page(s) if necessary */ + if (nand->bbt_options & NAND_BBT_SCANLASTPAGE) + ofs += mtd->erasesize - mtd->writesize; + + do { + ret = mtd_read_oob(mtd, ofs, &ops); + if (ret) + return ret; + + if (likely(nand->badblockbits == 8)) + ret = bad != 0xFF; + else + ret = hweight8(bad) < nand->badblockbits; + + i++; + ofs += mtd->writesize; + } while (!ret && (nand->bbt_options & NAND_BBT_SCAN2NDPAGE) && i < 2); + + return ret; +} + +static void mt7621_nfc_init_chip(struct mt7621_nfc *nfc) +{ + struct nand_chip *nand = &nfc->nand; + struct mtd_info *mtd; + int ret; + + nand_set_controller_data(nand, (void *)nfc); + + nand->options |= NAND_NO_SUBPAGE_WRITE; + + nand->ecc.mode = NAND_ECC_HW_SYNDROME; + nand->ecc.read_page = mt7621_nfc_read_page_hwecc; + nand->ecc.read_page_raw = mt7621_nfc_read_page_raw; + nand->ecc.write_page = mt7621_nfc_write_page_hwecc; + nand->ecc.write_page_raw = mt7621_nfc_write_page_raw; + nand->ecc.read_oob = mt7621_nfc_read_oob_hwecc; + nand->ecc.read_oob_raw = mt7621_nfc_read_oob_raw; + nand->ecc.write_oob = mt7621_nfc_write_oob_hwecc; + nand->ecc.write_oob_raw = mt7621_nfc_write_oob_raw; + + nand->dev_ready = mt7621_nfc_dev_ready; + nand->select_chip = mt7621_nfc_select_chip; + nand->write_byte = mt7621_nfc_write_byte; + nand->write_buf = mt7621_nfc_write_buf; + nand->read_byte = mt7621_nfc_read_byte; + nand->read_buf = mt7621_nfc_read_buf; + nand->cmd_ctrl = mt7621_nfc_cmd_ctrl; + nand->block_bad = mt7621_nfc_block_bad; + + mtd = nand_to_mtd(nand); + mtd_set_ooblayout(mtd, &mt7621_nfc_ooblayout_ops); + + /* Reset NFI master */ + mt7621_nfc_hw_init(nfc); + + ret = nand_scan_ident(mtd, 1, NULL); + if (ret) + return; + + mt7621_nfc_attach_chip(nand); + + ret = nand_scan_tail(mtd); + if (ret) + return; + + nand_register(0, mtd); +} + +void board_nand_init(void) +{ + nfc_dev.nfi_regs = (void __iomem *)CKSEG1ADDR(NFI_BASE); + nfc_dev.ecc_regs = (void __iomem *)CKSEG1ADDR(NFI_ECC_BASE); + + mt7621_nfc_init_chip(&nfc_dev); +}